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FAIIURE MODES AND EFFECTS ANALYSIS

OF NON-1E DEVICES CONNECTED TO

CLASS 1E POWER TO COMPLY WITH

REGULATORY GUIDE 1.75

NIAGARA MOHAWK POWER CORPORATION

NINE MILE POINT TWO

JANUARY 1986

Prepared Byate , r. ngineer

Electrical Design EngineeringM/C 023) Ext. 5-7180

a ja i, ec. ys. n .

Electrical Design EngineeringM/C 023, Ext. 5-2560

at a , r. ngxneerElectrical Design EngineeringM/C 023, Ext. 5-5389

Reviewed By ~'F ~ / f~6T. . arg, rxncipa ngineerElectrical Design EngineeringM/C 046, Ext. 5-3751

os ow, rxncipa ngineerElectrical Design EngineeringM/C 046) Ext. 5-5219

Approved Byeisc an, anager

lectrical Design EngineeringM/C 023, Ext. 5-3246

GENERAL ELECTRIC COMPANY NEBO SAN JOSE, CALIFORNIA

1.0-0

NINE MILE POINT 2

TABLE OF CONTENTS

~ INTRODUCTION

~ SECTION 1

Controllers: E12-R604A,BE12-R605E12"R606A,B

Recorders: B22-R615Selector Stations: E12-K605A,BManual Units: E12A-Z2A,B

SUB-SECTION

1.0

Pressure Meters:

Level Meters:

Control PowerTransformer:

Transducer:

Pressure Meters:Ievel Meters:

Pressure Meters:

Meters:

0 SECTION 2

Voltmeters:

E12"R605-1E12-R606A-1E12"R606B-1E12-R604A-1E12-R604B-1

E12-T01

E12-K001A,BE12-K003A,B

C41-R600A,BC41-R601,B22"R610

E51-R601E51-R602E51-R603E51-R604

E12-R608A)BE12-R609A)B

E22-R610E22-R611E22-R614E22-R615E22-R618

1.2"

1.3

1.4

1.5

1.6

1.7

2.1

11-2057 1.0-1

Ammeters

Watthour Meter:

Frequency Meter:

Transducer:

Transducers:

Meters:

Synchroscope:

Relays:

Switch:

0 SECTION 3

Signal ResistorUnits:

Junction Box:

Resistors:

Capacitors:

TABLE OF CONTENTS

(CONTINUED)

E22-R607E22-R616E22-R619E22"R620E22-R621

E22"R004

E22-R612

E22-K001

E22-K002E22-K003E22-R608E22-R609

E22-R613 .

E22B-K34, K37

E22B-S01, E22B-S12

E51A-SRU1,E22A"SRUlE12A SRU1Aj lB> 2A~ 2B~ 3A~ 38

C72A-JB103,B22H-JB402-407E12-JBl"9, 104, 109E21A-JB1-4E22A-JB1-4

B22C-Rol" R028B35A-R03A,B - R06A)BB22H-R01-4E12A-R114A,B, R115A)B,R111-13, R201-206E22B-R01A ROl"04)E22A-R21, R22

B35"C3A, 3B, 4A, 4BB35-C5A, 5B, 6A, 6B

SUB-SECTION

2.2

'2.3

2.4

2.5

2.6

2.7

2.8

2.9

3.1

3.2

3.3

3,4

11-2057 1.0-2

TABLE OF CONTENTS

(CONTINUED)

Receptacle:

Diodes:

Fuses:

B22C-J01,J02,E12A-J01)E21A-J01,E22A-J01)E51"J01

C72A-CR3A, CR3B, CR4A, CR4BE12A-CROl to CR13E21A-CR01 to CR17

E12A-F1, F2, F8, F9, F13, F14) F20F26-29, F30A,B, F31-34, F35,F37-39, F40-52, F53, F54, F62,F63, FXX (10A), FXX (5A)

E21A-Fl) F2) F5, F6-10) F12-15,F17-19) F20"24

E22A-F1-6, F7, F8, F9-11, F12-14

E22B-Fl-4) F7

B22C-Fl-10) F13-24, F41-52, F79-88, F113,F114, F120"123

B22H F13A)B) F19A)B) F62) F63) F79A)B)'F86A)B) F90A)B 92A)B) F95A)B

B22"F119, 12B

SUB-SECTION

3.5

3.6

3.7

C72A"F21A)B) F22A,B) F53A,B, F54A)B

E51A-Fl-27

Test Switches: E22B-TS5, TS6

Test Blocks: E22B-T1Sl, TS2, TS3, TS4, TS7, TS8

Meter Relay Panels: C41-ZOlA, 1B

3.8

3.9

3.10

11-2057 1.0-3

INTRODUCTION

In the present design of the Nine Mile Point. 2 NSSS safety-related systems,situations exist where non-lE devices are connected to Class lE bus. To complywith the requirements of Regulatory Guide 1.75, these situations requireanalysis to demonstrate that the failure of non-1E devices would not degradethe Class lE power source.

The non-Class 1E devices (connected to Class 1E power) analyzed in this reporthave been identified by a study of Elementary Diagrams and Elementary DiagramDevice Iists for all safety systems in the GE scope of supply for Nine MilePoint 2. Devices qualified for Class 1E applications and devices connected to a

Class lE power supply during testing or maintenance only (not during normalplant operations) are excluded from the analysis.

The Failure Modes and Effects Analysis (FMEA) evaluates all device failuremodes that have the potential for adversely affecting the Class lE bus. Theworst case failures of open circuit and short circuit conditions induced bynon-lE devices have been considered.

The circuit containing each non-Class 1E device is analyzed to demonstrate thatfailure of the device will not degrade the Class lE bus or the functions ofthe Class lE devices powered by the same source. In a few cases identified bythis study, the addition of an overcurrent protection device has been recom-mended to provide redundant circuit isolation mechanism with added assuranceand'o meet current NRC acceptance criteria.

GE documents will identify non-1E fuses or other current limiting deviceswhich are relied upon for protection of Class lE power supplies; and the non-lEdevices included in Section 3 of the report which are justified by referenceto panel seismic testing and require that any future replacement or changes beequal or superior.

The report is grouped into three sections:

Section 1 contains non-lE devices from the RHR, SLCS, RCIC and NBS systems.The engineering analysis contained in this section takes credit forcircuit protection (fuse or current-limiting components). The conceptof redundant fuse protection and current-limiting components in series, toisolate non-1E devices upon their failure, has also been applied in thissection. The design analyzed in this Section does not consider theimplementation of Reg. Guide 1.97. Design changes, if any, necessitatedby the Reg. Guide 1.97 implementation will supercede the affected portions.of this Section,

Section 2 contains non-1E devices from the HPCS power supply system whichare connected to Class lE bus, however they perform metering functiononly. The Failure Modes and Effects Analysis contained in this sectiontakes credit for redundant Class 1E fuses or Class lE current transformerto isolate non-Class 1E devices upon their failure.

11-2057

~ Section 3 contains an application justification for resistors, capacitors,fuses, junction boxes, diodes, receptacles, signal resistor units, testswitches, and meter relay panel, based on their similarity to qualifiedClass 1E devices, their performance history in operating BWR's, and seismictest report information on identical parts. These non-1E devices do nothave any different inherent failure mechanism from that of the similarqualified devices, which could degrade the Class lE bus or the safetyrelated function.

Each section has included all non-1E component/devices connected toClass 1E power analyzed in that group, with their system application (MPL

g's) and GE Purchase Part Drawing Numbers (PPD jj's).

11-2057 1.0"5

SECTION 1.1

CONTROLLERS: E12-R604A,B,E12-R605E12"R605

RECORDERS: B22-R615SELECTOR STATIONS: E12-K605A,BMANUAI UNITS: E12A-Z2A)B

PPD: 248A9393

PPD: 163C1871PPD: 272A7240PPD: 272A7232

The above devices are grouped together since they are common to power supplyE12-PS09 or E12-P010 (see Figure 1.1-13) and exhibit common design features.

1. DEVICES DESCRIPTION

Controllers (E12-R604A B E12-R605 R606A B)

The basic controller identified by PPD No. 248A9393 (Groups G005, G006 andG007) is a Bailey Type 701, Cat. No. 701002AAAA1. Figure 1.1-1 shows a

schematic of the controller.

Recorder (B22-R615)

The recorder identified by PPD No. 163C1871P1710000 is a Bailey 772 narrowstrip chart recorder, Cat. No. 772111AAAAl. Figure 1.1-2 shows a schema-tic of the recorder.

Selector Station (E12-K605A B

The auto selector station identified by PPD No. 272A7240P001 is a BaileyType 747 high/low automatic signal selector, Cat. No. 747010AAAA.Figure 1.1-3 shows a schematic of the selector switch;

Manual Unit (E12A-Z2A B)

The manual unit identified by PPD No. 272A7232P001 is a Bailey Type 722,Unit Cat. No. 722001AAAAl. Figure 1.1-4 shows a schematic of the manualunit.

All of the above devices have the following design features in common:

They have internal fuse protection (see Figures 1.1-1 to 1.1-4).

Devices identical to the above devices were installed on the panelsseismically tested (Reference 6.2).

These devices are located in control room environment.

These non-1E devices are connected in associated circuits and areseparated from all non-divisional circuits. Associated circuits aretreated as Class 1E circuits and are maintained within the boundaryof the respective division. Thus, the faults from external non-divisional circuits will not affect the Class 1E bus.

11-2057

These devices are connected in low energy circuits.

1.1"1

DEVICE FUNCTION

Controllers

Pressure controller R605 and level controllers R604A and B provide controlsignals to non-safety-related condensate discharge valves E12"F065A and B,xespectively (see Figure 1.1-6). Pressure controllers R606A and B providecontrol signals to non-safety-related steam pressure-reducing valvesE12-F051A and B (see Figure 1.1-5). These controllers R604A and R606A areconnected to power supply E12A-PS09 and controllers R604B, R605 and R606Bare connected to power supply E12A-PS10, which in turn are powered byClass 1E.buses (see Figure 1.1-13).

Recorder

The recorder B22-R615 is used to record reactor water level in the fuelzone. This recording function is not critical to plant safety., It ispowered from 24 Vdc power supply E12A-PS10 (see Figures 1.1-7 and 1.1-13)and also from 24 Vac transformer, E12A-Tl.

Selector Station

The high/low automatic selector switch E12-K605A(B).is used to automaticallyand continuously select the highest or lowest of input signals in the 1-5 .Vdc range. The selector station. provides input signals to the non-1E manualunit E12A-Z2A and Z2B in order to operate non-safety-related valveE12-F065A(B). It is powered from 24 Vdc power supply E12A-PS09(E12A-PS10). (See Figures 1.1-6 and 1.1-13.).

Manual Units

The manual units E12A-Z2A,B provide a 4 to 20 mA signal to the convertersE12-K001A and B to operate non-safety-related condensate valves E12-F065Aand B (see Figure 1.1-8). These manual units are powered by Class 1E bus,power supply E12A-PS09 or E12A-PS10, respectively.

FAIIURE MODES AND EFFECTS ANALYSIS

en Circuit Condition

The device failure may cause an open circuit condition, thus disabling thedevice function. Each device's function, as described in Paragraph 2,above, is not critical to its system's safety function and thus can belost without degrading safety. An open circuit will disconnect the devicefrom the Class lE power and thus the Class lE power source will not beaffected by the open circuit.

Short Circuit Condition

A failure of the device may cause an internal short circuit condition.This condition will cause excessive current demand. The followinganalysis evaluates the present protection provided for the individualdevices:

1.1"2

Controllers. In the controllers, 1 amp fuse (Fl) will open when currentdemand is more than 1 amp and will disconnect the non-1E device from its24 Vdc power source. In addition to fuse protection, there are current-limiting components (Resistor R96 and Diodes CR5 and CR32) internal to thedevice circuit (see Figures 1.1-1 and 1.1-9).

Recorder In the recorder, 1 amp fuse (Fl) will open when current demandis more than 1/2 amp and will disconnect the non-1E device from its powersource (see Figures 1.1-2 and 1.1-10).

Selector Stations In the selector station, 1/8 amp fuse (Fl) will openwhen current demand is more than 1/8 amp and will disconnect the non-1Edevice from its power source. En addition to fuse protection, there arecurrent-limiting components (Resistor R33, R34 and Diode CR37) internal tothe device circuit (see Figures 1.1-3 and 1.1-11).

Manual Units In the manual units, 0.2 amp fuse (Fl) will open whencurrent demand is more than 0;2 amp and will disconnect the non-1E device.In addition to fuse protection, there are current-limiting devices(Resistors R83, R78 and Diode CR26 and CR27) internal to the device circuit(see Figures 1.1-4 and 1.1-12).

In addition, any'ailuxe-causing excessive current in the instrument loop(downstream of SRU3A or SRU3B) will be limited by resistoxs in the SRU. Allthe devices in the loop of SRU3A or SRU3B are associated and thus can be lostwithout degrading .the system safety.

In all of the above cases, the internal overcurrent protection devices(i.e., fuses) and the current-limiting devices (i.e., resistors in SRU)will disconnect the device in fault condition and thus provide protectionto Class lE power source. However, to comply with the NRC acceptancecriteria of Regulatory Guide 1.75, an additional overcurrent protectiondevice (10A fuse) is to be added in the applicable circuit to ensurethat the circuit will tolexate a'ault plus a single failure in theprotection circuit without jeopardizing the Class lE power source.Opening of the overcurrent protection device (fuse) will not degrade anysafety function.

4.

To satisfy the FRC acceptance criteria, the following changes are required(see Figure 1.)-14):

Add 10 Amp fuse at the output of power supplies E12"PS09 andE12"PS10.

11 "2057 1.1-3

5. CONCLUSION

The analysis demonstrates that the faults induced by these non-lE deviceswill be cleared by opening of fuse and/or current-limiting components inthe circuits, thus isolating the non-lE device from the Class 1E powersource. If a single fuse or current-limiting component fails to open,additional fuse protection will provide further assurance of isolating thenon-lE device from the Class 1E bus. Non-1E devices so isolated will notdegrade the Class 1E bus and thus the design provided complies with theacceptance criteria of Regulatory Guide 1.75.

6. REFERENCES

6.1 RHR System E/D Nos. 807E170TY 'and DL807E170TY

6.2 GE Design Record File DRF jlH13-61

11-2057 1. 1-4

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PRESSURE METERS:

LEVEL METERS:

E12 R605"1E12"R606A-1E12"R606B"1E12"R604A-1E12-R604B-1

PPD: 159C4540

PPD: 159C4540

1. DEVICE DESCRIPTION

The basic GE Type 180 meter, identified by PPD 159C4540 (P237030 andP216026), is an. edgewise panel meter with D'Arsonval movement. Thesemeters are configured as voltmeters with an internal resistor (20k o ) inseries with a movable coil (see Figures 1.2"1, 1.2-2 and 1.2"3).

The above devices have the following design features in common:

These meters are similar in type, material, and construction tosafety-related meters identified by PPD 164C5288.

Identical devices (PPD 159C4540) were installed on 'the seismically-tested panels (Reference 6.2).

~ These devices are located in the control room environment.

The non-1E devices are connected in associated circuits and areseparated from all non-divisional circuits. Associated circuits aretreated as Class 1E circuits and are maintained within the boundaryof the respective division. Thus, the faults from the externanon-divisional circuits will not affect the Class 1E bus.

~ These devices are connected in low energy circuits.

2. DEVICE FUNCTION

Meter E12-R605-1 provides operator information on condensate dischargepressure. E12-R604A-l, B-1 display RHR heat exchangers water level.E12-R606A-1 and E12-R606B-1 provide information on steam pressure in theinlet piping connected to the shell side of RHR heat exchangers. Thesedisplays axe not critical to the system safety function. . The metersreceive power via SRUS from 24 Vdc power supply E12A-PS09 or E12A-PS10which are powered by Class lE, Division 1 and Division 2 buses,respectively (see Figures 1.2-4, 1.2»5 and 1.2-6).

11-2104

3. FAILURE MODE AND EFFECTS ANALYSIS

en Circuits

An open circuit in, or at, the meter will result in loss of the meterfunction. The function (operator information) is not critical to thesystem's safety function and can be lost. There will be no effect on theClass 1E power supply from this type of failure.

Short Circuits

The excessive current demand caused by short circuit condition at themeters will be reflected in SRU3A or SRU3B. The current will be limitedby the resistors in the SRU3A or SRU3B. However, to comply with the NRC

acceptance criteria of Regulatory Guide 1.75, an additional fuse (10 Amps)in power supply circuit (E12-PS09 and E12-PS10), as discussed in Section1.1, will provide redundant protection for the Class IE power source (seeFigures 1.2-6 and 1.2-7). This ensures that the circuit will tolerate afault plus a single failure in the protection circuit without jeopardizingthe Class 1E power source. Opening of the overcurrent device (fuse) willnot degrade any other safety function.

4.

See Section 1.1.

5. CONCLUSIONS

The analysis demonstrates that the faults induced by these non-1E deviceswill be cleared by opening of current-limiting components (fuses) in thecircuits, thus isolating the non-lE device from the Class lE power source.If a single current-limiting component fails to open, the additional fuseprotection will provide further assurance of isolating the non-1E devicefrom the Class 1E bus. Non-lE devices so isolated will not degrade theClass 1E bus and thus the design provided complies with the acceptancecriteria of Regulatory Guide 1.75.

6. REFERENCES

6.1 RHR System E/D Nos. 807E170TY and DL807E170TY

6.2 GE Design Record File DRF gHI3-61

11"2104 1.2-2

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PROTECTION QF CESS 1E BUS (PCNER SUPPLY)FKM FAILURE OF NON-2E DPTECE

SECTION 1.3

CONTROL POWER TRANSFORMER: E12-T01 PPD: 209A4866


Control Power Transformer E12-T01 PPD No. 209A4866 (P002) is an Elma2T-1528, rated 0.15 KVA (see Figure 1.3»1). The transformer is built toMIL-T-27 specification. The windings are epoxy impregnated .and theinsulation is Nomex, which has a continuous service temperature of 200 C.

~ The identical device was installed in seismically-tested panels(Reference 6.2).

This device is located in the control room environment.

~ This non-1E device is connected in associated circuit and isseparated from all non-divisional circuits. Associated circuit istreated as Class 1E circuit and is maintained within the boundary ofthe respective division. Thus, the faults from the external non"divisional circuits will not affect the associated boundary and thusthe Class 1E,bus will not be degraded.

~ Control transformer is connected in low energy circuit.

2. DEVICE FUNCTION

The control transformer steps down 120 Vac to 24 Vac for powering thereactor water level fuel zone recorder (B22-R615). The reactor waterlevel fuel zone recording function is not critical to system safety (seeFigures 1.3-2 and 1.3"3).

3. FAILURE MODES AND EFFECTS ANALYSIS

en Circuit

An open circuit condition in the control transformer will cause disablingof reactor water level fuel zone recording function. The recordingfunction, as described in Paragraph 2, is not critical to the systemsafety function and thus can be lost. There will be no effect on Class 1Epower from this type of failure.


A short circuit condition inside the device will cause excessive currentdemand. In the above case, the existing overcurrent, protection device(i.e., 5 amp fuse) at the primary side of the transformer will disconnectthe transformer from the bus and thus provide protection to Class lE powersource. However, to comply with the NRC acceptance criteria of RegulatoryGuide 1.75, an additional overcurrent protection device (i.e., 5 amp fuse)to be added in series with the existing fuse to ensure that the circuitwill tolerate a fault plus a single failure in the protection circuitwithout jeopardizing the Class 1E power source (see Figure 1.3-4).

11-2104 1.3-1

Opening of the overcurrent protection device (fuse) will not degrade anyother safety function.

To satisfy the NRC acceptance criteria for additional protection, it isrequired to add 5 amp fuse in series with existing fuse on the primaryside of the transformer (see Figures 1.3-4 and 1.3-5).

5. CONCLUSION'

The analysis demonstrates that the faults induced by the non-lE trans-former will be cleared 'by opening of fuse in the circuit, thus isolatingthe transformer from the Class 1E power source. If a single fuse fails to .

open, the additional fuse protection will provide further assurance ofisolating the transformer from the Class lE bus. The transformer soisolated will not degrade the Class 1E bus and thus the design providedcomplies with the acceptance criteria of the Regulatory Guide 1.75.

REFERENCES

6.1 RHR E/D 807E1701Y

6.2 GE Design Record File DRF $/A00-1135-10 (A00»1084)

11-2104 1.3-2

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SECTION 1.4

TRANSDUCER: E12"KOOlA) BE12"K003A,B

PPD: 158B7013

'1. DEVICE DESCRIPTION

Transducers E12-K001A,B and K003A,B are Fisher Type 546 transducers asidentified by PPD No. 158B7013P007. They receive a 4 to 20 mA DC'inputsignal and transmit a proportional 3-15 psig air output signal dependingon the input to a control valve. Figure 1.4-1 shows the circuit for the 4to 20 mA DC signal with the 176 ohm DC resistance of internal coils.

~ This device is enclosed in an explosion-proof aluminum case.

These non-1E devices are connected in associated circuits and areseparated from all non-divisional circuits. Associated circuits aretreated as Class 1E circuits and are maintained within the boundaryof the respective divison. The faults from the external non-divisional circuits will not affect the associated circuits in theboundary and thus the Class IE bus will not be affected.


2. DEVICE FUNCTION

These transducers are used as I/P converters and are used to control thecondensate return valve which controls the flow of condensate fromResidual Heat Removal (RHR) system heat exchangers to either the suppres-sion pool or the RCIC system during operation of the RHR system in thesteam condensing mode.

The E12-K001A,B converters receive current signal from selector stationsE12-K605A,B. The signals are used to regulate output air pressure between3 and 15 psig.

The power source for the E12-K605A selector station and manual unit Z2Awhich supplies the control signal to the E12-K001A I/P converter and thepower source for E12-R606A pressure controller supplying control signal toE12-K003A I/P converter is E12A-PS09 (Division 1). The power source forthe E12-K605B selector station and manual unit Z2B which supplies thecontrol signal to the E12-K001B I/P converter and the power source forE12-R606B pressure controller supplying control signal to I/P converterE12-K003A is E12-PS10 (Division 2) (see Figures 1.4-3, 1.4-4 and 1.4-5).

3. FAILURE NODES AND EFFECTS ANALYSIS


The device failure may cause an open circuit condition, thus disabling thedevice function. This device, as described in Paragraph 2, does not

11-2104

perform function critical to safety and thus can be lost without degradingsafety. Open circuit will disconnect the device from the Class lE powerand thus Class lE power source will not be affected by the open circui


The failure of the device may cause short, circuit condition in thecircuit. A short in the input to the I/P converters is current- limitedby the upstream components. The current drain on the lE bus as a resu tof fault in the I/P converter will be limited to the maximum output of theBailey Type 722 manual (Z2A,B) units, which is 20 mA. Upstream components(EI2-Z2A and Z2B) from the I/P converters have current-limiting devices intheir circuitry (fuse, resistor, diode). The excessive current demandcaused by short circuit condition at I/P converter will be reflected inmanual units E12-Z2A,B. Fuse (0.2 amp) in the manual unit will open onexcessive current demand and thus disconnect the faulty device fromClass 1E power.

However, to comply with the NRC acceptance criteria of Regulatory Guide1.75, fuse (10 amps) in power supply circuit (E12-PS09 and E12-PS10); asdiscussed in Section 1.1, will provide additional protection of Class 1Epower source (see Figures 1.4-5 and 1.4-6). Opening of the overcurrentpro ec irotection device (fuse) will not degrade any other safety function.

4.

See Section 1.2.

5. CONCLUSION

The analysis demonstrates that the faults induced by non-lE device will becleared by opening of fuse in the circuits, thus isolating the non-lEdevice from the Class lE power source. If a single fuse fails to open,the additional fuse protection will'provide further assurance of isolatingthe non-lE device from the Class lE bus. Non-.lE devices so isolated willnot degrade the Class 1E bus and thus the design provided complies withthe acceptance criteria of the Regulatory Guide 1.75.

6. REFERENCES

6.1 RHR System E/D Nos. 807E170TY and DL807E170TY

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PRESSURE METERSLEVEL METERS

C41-R600A,B;C41"R601B22"R610

PPD: 159C4540PPD: 159C4540


The basic GE Type 180 meter, identified by PPD 159C4540 (P139013, P148005and P145229), is an edgewise panel meter with D'Arsonval movement. Metersprovided under the above part numbers are configured as ammeters with an

- internal resistor in parallel with a movable coil (see Figures 1.5-1 and1.5-2).

~ These meters are similar in type, material and construction tosafety-related meters identified by PPD 164C5288.

An identical meter, PPD 159C4540, was installed on control room panelH13-P601 that was seismically tested.

The non-Class 1E devices 'are connected in associated circuits and areseparated from all non-divisional circuits. Associated circuits aretreated as Class lE circuits and are maintained within the boundaryof the respective division. Thus, the fault from the external non-divisional circuits will not affect the associated circuits in theboundary and the Class 1E bus will not be affected.


2. DEVICE FUNCTION

Meters C41-R600A,B provide operator information on SLCS pump dischargepressure; C41-R601 displays liquid level in the SLCS storage tank; andB22-R610 displays reactor water level in the fuel zone. These devices donot perform any function critical to the safety of the system. The metersreceive power from 24 Vdc power supplies (associated circuit), which inturn are powered by a Class lE, Division 1 or Division 2 UPS bus (seeFigures 1.5-3 through 1.5-7).

3. FAILIHK MODES AND EFFECTS ANALYSIS

en Circuits

An open circuit in, or at, the meter may result in loss of the meterfunction.. Opening the shunt will result in the coil carrying the circuitcurrent. The coil wires are so small that they would burn out immediatelyand result in an open circuit causing loss of meter indication. Thefunction (operator information) is not critical to system safety functionsand thus can be lost. There will be no effect on the Class lE powersupply.

11-2057 1.5" 1

Short Circuits

A short circuit condition may short the shunt resistor in the meter. Theexcessive current demand caused by short circuit condition at the meterswill be reflected in SRU1 or SRU2. The current demand will be limited byresistors in these SRU1 or SRU2. In the case of meter B22-R610, there isalso a 250 ohm current-limiting resistor between it and the SRU (seeFigure 1.5-6).

In all of the above cases, the current-limiting components (i.e., SRUresistors) will limit the current and open on excessive demand of currentduring fault condition and thus provide protection to Class 1E powersource. However, to comply with the NRC acceptance criteria of RegulatoryGuide 1.75, a fuse (10 Amps) in the power supply circuit (E12-PS09 andE12-PS10), as discussed in Section 1.1, willprovide additional protectionof Class 1E bus (see Figures 1.5-6, 1.5-7 and 1.5-8). Fuse (1 Amp) at thesecondary side of P/S C41"K600A or B will provide protection to powersupplies C41-K600A or B. Opening of these overcurrent protection devices(fuses) will not degrade any other safety function.

4. M HAM

See Section 1.1.

5. CONCLUSIONS

The analysis demonstrates that, the faults induced by these non-lE deviceswill be cleared by opening of the current-limiting components in thecircuits, thus isolating the non-lE device from the Class 1E power source.If individual current-limiting components fail to open, the additionalfuse protection will provide further assurance of isolating the non-lEdevice from the Class lE bus. Non-lE devices so isolated will not degradethe Class lE bus and thus the design provided complies with the acceptancecriteria of Regulatory Guide 1.75.

6. REFERENCES

6.1 SLCS System E/D 807E161TY

6.2 RHR E/D 807E170TY

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FIGURE 1.5-8CXASS 1E BUS/PCNER SUPPLYPEKGlKTlCN FR& FAIIVRE

-QF NONE-1E DEVICE.

SECTION 1.6

PRESSURE METERS E51-R601E51-R602E51-R603E51"R604

PPD: 159C4540


The basic GE Type 180 pressure meter, identified by PPD 159C4540 (P243220,P243026, and P243028), is an edgewise panel meter with D'Arsonval move-ment. Meters provided under the above part numbers are configured asvoltmeters with an internal resistor (20k ohm) in series with a movablecoil (Figures 1.6-1 and 1.6-2).

~ These meters are identical in type, material and construction tosafety-related meters identified by PPD 164C5288.

An identical meter was installed on control room panel H13-P601 thatwas seismically tested (Refe'rence 6.4).

~ The meters are located in the control room environment.

These non-1E devices are connected in associated circuits and areseparated from all non-divisional circuits. Associated circuits aretreated as Class lE circuits and are maintained within the boundaryof the respective division. Thus, the faults from the externalnon-divisional circuits will not affect the associated circuits inthe boundary and the Class 1E bus will not be affected.

These devices are connected in the low energy circuits.

2. DEVICE FUNCTION

Meter E51-R601 provides operator information on RCIC pump dischargepressure; E51-R602 indicates RCIC steam supply pressure; E51-R603 displaysRCIC turbine exhaust pressure; and E51-R604 displays pump suctionpressure. These functions are not critical to the safety function. TheE51-R601, 603 and 604 meters receive power from power supplies E21A-PS2and E21A-PS3 which in turn are powered by a Class lE, Division 1 UPS bus(see Figures 1.6-3 through 1.6-7). The E51-R602 meter receives powerthrough E51A-SRUl (analyzed in Section 3.1) from AC/DC power supply(Class 1E) E51-K600. E51-K600 is in turn powered by Class lE bus,.Division 1 UPS Bus .A. (See Figures 1.6-10 and 1.6-11.)


en Circuits

An open circuit in, or at, the meter will result in loss of the meterfunction. The function (operator information) is not critical to system'ssafety functions and can be lost. There will be no effect on the Class lEpower supply.

11-2057

Short Circuits

An internal short or a short at the meter terminals will not causeexcessive current demand because the internal resistor (20k ohm) willlimit the current. In addition, for meter E51-R601, 603 and 604, aprotective network in the auxiliary analog output of the associated mastertrip unit (E51-N652, E51-N650, E51-N656A) provides short circuitprotection (see Figures 1.6-3, 1.6-8 and 1.6-9.) This protective networkconsists of 2k ohm resistors R72 and R73 and several zener diodes. Theauxiliary analog output is isolated by design configuration from faults atthe output at pin 16 (see Figure 1.6-8). Class lE power supply isprotected from any failure of meter E51-R602 by the current-limitingcharacteristics of SRU E51A-SRU1 which is analyzed in Section 3.1 of thisreport. Additional protection to Class lE power supply is provided byfuse E51A-F26 (10 Amps) located between SRU1 and PS E51-K600. (See Figure1.6-11.)

4. RECOMMENDED CHANGES

None.

5. CONCLUSIONS

The analysis demonstrates that the faults induced by these non-IE deviceswill be cleared by current-limiting components in'the circuits, thusprotecting the integrity of the Class lE power supply.

6. REFERENCES

6.1 RCIC System E/D 807E173TY

6.2 LPCS System E/D 807E171TY

6.3 Rosemount Trip/Calibration Unit Service Manual 4247-2

6.4 GE Design Record File DRF jjH13-61

11-2057 1'. 6-2

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FIGURE l.6-3.

GE TYPE 180 MEHm

COIL series

FIGURE 1. 6-2

SCHEMATIC OF GENERIC VOL'MAKE

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Pin Oesignatlons lor Operational Ampliliers AR9 end AR10 )Top View).

NOTES:1. Colnponents In this circuit eppitl to the:

~ Master Trip Unit with Analog Output2. Reler to Figure 7 lor location ot test points on printed wlrlnpassembly,

FIGURE l.6-7

TEST POINTS-AUXELXAHYANMDG OUTPUT CIRCUIT RDSEMQUNT MAST)& TRIP UNIT

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CIASS lE BUS & PCNER SUPPLYPROTECTED FRCN SHORT IN MEZi&BY CUREKNT LIMITINGRESISTANCE INMEIKR AND GSE ISOIATION OF TRIPUNIT AUXELIARYANAIDG OUTPUT.

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NON ITORINO

FIGURE 1.6-11. SRUl, FUSE F26 AND CLASS 1E POWER SUPPLY E51-K600RCIC E/D NO. 807EI73TY (SH. 3)

SECTION 1.7

METERS: E12-R608A)B, PPD: 112C3768E12-R609A,B


Meters

The meters identified by PPD 112C3768P029 are GE type 185 horizontal,indicating valve opening in percentage.

~ These meters are identical in type, material and construction to thenuclear-safety-related meters PPD $/164C5288.

These meters are located in the control room environment.

~ Identical devices were 'installed on panels seismically tested(Reference 6.3).

~ These non-lE devices are connected in associated circuits and areseparated from all non-divisional circuits. Associated circuits aretreated as Class 1E circuits and are maintained within the boundaryof the respective division. The faults from the external non-divisional circuits will not affect the associated circuits in theboundary and thus the Class lE bus will not be affected.

2. DEVICE FUNCTION

E12-R608A and E12-R609A are the meters measuring the valve opening forheat exchanger vent valves E12-F073A and E12-F074A, respectively, and areconnected to Division 1, 125 Vdc power source. E12-R608B and E12-R609Bare the meters measuring the valve openings for valves E12-F073B andE12-F074B, respectively, and are connected to Division 2, 125 Vdc powersource (see Figures 1.7-1 and 1.7-2). The indicating function is non-essential and loss of this function has no impact on system safety func-tion.

3. FAILURE MODES AND EFFECT ANALYSIS

Following are the failure modes of the meter circuit:

The device failure may cause open condition in the circuit. An opencircuit will not allow the meter coil to energize and valve openingpercentage indication will be lost. The device function is non-essentialand therefore not critical to the system safety function. There will beno adverse effect on the safety of the system nor on the Class lE powersource.

11-2057 1.7-1

Short Circuit:

a) Failure of the device may cause short across meter without grounding.A short circuit occurring across meter terminals may create anungrounded shorting across the power supply bus positive and negative.This may provide a low impedance current path through the circuitprotective devices. The variable resistor (750Q) in the circuit willlimit the current through the shorted circuit; however, this analysisconsiders the worst case condition where the variable resistance isat zero. The 10 Amp fuse at the source will provide protection of thepower supply. The upstream of the circuit has 30 Amp fuse switches inpanel 2BYS"-PNL201A for Division 1 and 2BYS-PNL201B for Division 2,and will provide an additional level of protection. Since twoovercurrent protective devices are in series and are coordinated(i.e., downstream 10 amp fuse and upstream 30 amp fuse switch), themeter circuit fuse is suspected to open prior to the opening of the 30amp fuse switch. Thus, the circuit will tolerate a fault plus a

single failure in the protection circuit (fuse or fuse switch) withoutjeopardizing the Class lE power source (see Figure 1.7-3).

b) Failure of the device may cause short of either positive or negativeto ground. A short circuit at the meter may cause a grounded shorton dc power supply. The worst failure mode would be shorting ofpositive side of the meter wiring to ground, since this will providea low impedance ground path to the dc power supply. Again, 7500variable resistor will limit the current through the shorted circuit;however, this analysis considers the worst case condition when thisresistance is at zero. As discussed in Paragraph 3.b.l, the 10 Ampfuse in the control room panel H13-P601F and 30 Amp fuse switch atthe 125 Vdc power distribution panel are coordinated (Figure 1.7-4).This would enable the meter circuit to be isolated prior to the 30Amp fuse switch opening. Thus, the Class 1E bus will not bedegraded.

4.

c) In any of the above cases, the opening of the overcurrentprotection device (fuse) will not degrade any other safety function.

None.

5. CONCLUSION

The analysis demonstrates that circuits for E12-R608A,B and E12-R609A,Bmeters have two overcurrent protective devices both in series andcoordinated (Figure 1.7-4), ahd therefore the devices so protected willnot degrade the Class 1E bus. Thus, the existing design complies with theacceptance criteria of Regulatory Guide 1.75. No design. change isrequired.

6. REFERENCES

6.1 Residual Heat Removal System E/D, Drawing No. 807E170TY

6.2 Stone 6 webster Drawing No. 12177EE»10A-3

6.3 GE Design Record File DRF jjH13-6111-2057 1.7-2

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FIGURE 1.7-4

SECTION 2.1

VOLTHETERS: E22-R610E22-R611E22-R614E22-R615E22"R618

1. DEVICE DESCRIPTION:

The above-listed voltmeters are identified by the basic purchase partDrawing No. 163C1157.

These are GE type AB/DB-40 meters, and are weather-tight switchboardinstruments with taut band construction (see Figures 2.1.1 and 2.1.2).These meters have an internal resistance in series with a movable coil.Schematic diagrams for the voltmeter are shown in Figure 2.1.3.

~ Identical to the above devices were installed on the panels seis-mically tested (Reference 6.3).

~ These devices are located in controlled environment.

These non-1E devices are connected in associated circuits and areseparated from all non-divisional circuits. Associated circuits aretreated as Class 1E circuits and are maintained within the boundaryof the respective division. Thus, the faults from the external non-divisional circuits will not affect the Class lE bus.

2. DEVICE FUNCTION

These voltmeters indicate generator, normal power source, reserve powersource, SWGR 4160V bus and 125 Vdc voltages (see Figures 2.1-4 through2.1-8). Voltmeters E22-R610 and E22-R615 are connected to Class lE busthrough voltmeter switches (see Figures 2.1-4 through 2.1-7). VoltmeterE22-R618 is connected to Class lE bus through two redundant fuses (2 Amps)in series. Voltmeter E22-R611 and R614 are connected to Class 1E busthrough synchronizing switches S4, S6 and S14.


en-Circuit Condition

An open circuit in, or at, the meter will cause a disabling of the devicefunction. The device's function is not critical to the system functionand thus can be lost.

Since all voltmeters are connected to Class 1E circuit through theirrespective switches, opening of meters will not have any adverse effect onthe Class 1E potential transformer (P.T.) circuit.

11-2057


A short circuit in or at the meter may affect the meter indicationfunction; however, this function is not critical to system safety and canbe lost. The short circuit condition may cause excessive current demandin circuit.

A 10 Amp fuse at the secondary of the potential transformer or tworedundant fuses (2 Amps) in series for E22-R618 will provide protectionfor the Class lE bus by disconnecting the device in fault condition.These metering circuits do not include other safety-related devices orcircuits. Opening of these fuses will not degrade any safetyfunction.

Following tabulation shows the meter and the respective Class 'lE'usesin series that protect the meter.

E22-R610

"R611

-R614

-R615

-R618

Class lE

'10A Fuse(FU-X1)

10A Fuse(FU-3)

10A Fuse(FU-9)

lOA Fuse(Fu-11)

2A Fuse(FU-31, 32)

Class lE

P.T. PRIM. Fuse 2A(F'U-'H1)

P.T. PRIM. Fusesof

1 Amp(FU-H2, H3 and H4)

I

2A Fuse in PNL H13-P852C(FU-X5, FU-X6)

4. ~IRK C

None.

5. CONCLUSION

The analysis demonstrates that the faults induced by these non-lE deviceswill be cleared by opening of the fuse at the secondary of thetransformer. Non-lE devices so protected will not degrade the Class 1E

bus and safety-related devices or circuits. Thus, the design providedcomplies with the acceptance criteria of Regulatory Guide 1.75.

6. REFERENCES

6.1 HPCS PS E/D No. 807E183TY

6.2 GE Switchboard Instruments, Bulletin GEP-302H

6.3 GE Design Record File DRF /jH13-61

11-2057 2.1-2

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SECTION 2.2

AMMETERS: E22-R607E22"R616E22-R619E22-R620E22-R621

l. DEVICE DESCRIPTION:

The above-listed ammeters are identified by the basic purchase partdrawing No. 163C1157.

These are GE type AB/DB-40 meters and are weather-tight switchboardinstruments with taut band construction (see Figures 2.2-1 and 2.2-2).These meters have resistance in parallel with a movable coil. Schematicdiagrams for the ammeter are shown in Figure 2.2-3.

~ These devices are located in controlled environment in DieselGenerator Room.

Identical devices were installed on the panels seismically tested(Reference 6.3).

~ These non-1E devices are connected in associated circuits and areseparated from all non-divisional circuits. Associated circuits aretreated as Class 1E circuits and are maintained within the boundaryof the respective division. Thus, the faults from the external non-divisional circuits will not affect the Class 1E bus.

2. DEVICE FUNCTION

These ammeters indicate generator, HPCS pump motor, normal power source,reserve power source and HPCS motor control center transformer current.

The above ammeters are connected to 0-1 mA transducers and the transducersare fed from current transformers which are on Class lE bus (seeFigures 2.2-4 through 2.2-8).

3. FAIIURE MODES AND EFFECTS ANALYSIS


An open circuit in or at the meter and its associated current transducerswould render the devices inoperative. Also, it may cause the currenttransformer (CT) circuit to open. If the primary bus bars are carryingthe full load current then only it can cause excessive core losses in thecurrent transformer, and this will cause the transformer winding to open.

11-2057 2. 2-1

However, the transformer is Class lE device, and the burning of itswinding will not degrade the primary insulation because the window typeCT does not touch Class lE bus bars. Thus, this failure will not affectClass lE bus which is on the primary side of the transformer. The metersare not critical to the system's safety function; therefore, its functioncan be lost.

Since all ammeters are connected to Class lE circuit through theirrespective transducers and auxiliary current transformers, opening ofmeters will not have any adverse effect on the Class 1E C.T. circuit.Also opening of CT will not degrade any safety equipm'ent or circuits.

Short Circuit Conditions

A failure of non-lE device may cause short circuit condition inside thedevice. Since the coil resistance of the ammeter is much greater than theresistance of the shunt, internal shorting of the shunt will not affectthe current appreciably (less than lg) as the shunt already carriesgreater than 99$ of the circuit current. If the coil wires are shorted,the coil would burn out immediately. This may result in the shorting ofcurrent transformer secondary circuit. Shorting'the current transformersecondary winding, however, would not affect the bus" because. it is aconstant current source which is independent of,the load in the secondarywinding circuit. Thus, Class lE bus will not be degraded by short at themeter.

4.

These metering circuits do not include safety-rel'ated devices or circuits.

RECOMMENDED CHANGES

None.

5. CONCLUSION

6:

The analysis demonstrates that either in open circuit or in short circuitin or at the device may affect the meter function; however, it will notdegrade the integrity of the Class lE power supply. The meter function isnot critical to the safety function. The safety related function is notdegraded.

REFERENCES

6.1

6.2

6.3

GE Switchboard Instruments, Bulletin GEP-302H

HPCS PS E/D No. 807E183TY

GE Design Record File DRF jjH13-61

11-2057 2.2-2

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SCALE~ POINTER

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RETAINING BUSHINGMOVING COIL

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METER E22-R621 HPCS-PS E/D No. 807El83TY

SECTION 2.3

WATTHOUR METER E22-R004


Watthour meter E22-R004 is identified by PPD No. 163C1159P002 as a GE typeDS-63 three-phase, three-wire switchboard watthour meter. The GE DS-63series watthour meter is of the induction type with two sets of stators(coils) and an aluminum disk rotor. Eddy currents are induced in the diskby the current coils and cause the disk to rotate when the eddy currentfields interact with the magnetic field set up by the voltage coils.Figure 2.3-1 is a schematic of the watthour meter circuitry.Figures 2.3-2 through 2.3-4 show meter E22-R004 and the connections to thediesel generator potential and current transformers.

The coils are mounted and isolated from the meter case. They areencapsulated, which provides environmental and mechanical protection,and the coils are rigidly secured. The only moving part in thepower-sensing circuit is the rotor. Failure of the rotor either bylocking or dismounting from its supports would not cause a short ofthe coils.

These devices are located in a controlled environment similar to thecontrol room.

These non-1E devices„ are connected in associated circuits and areseparated from all non-divisional circuits. Associated circuits aretreated as Class lE circuits and are maintained within the boundaryof the respective division. Thus, the faults from the external non-divisional circuits will not affect the Class lE 'bus.

2. DEVICE FUNCTION

The watthour meter indicates and registers kilowatt-hours supplied by thediesel.



A failure of this non-Class 1E device may cause an open circuit whichwould render the device inoperative. Also, it may cause the currenttransformer circuit to open. If the primary bus bars are carrying thefull load current then only it can cause excessive core losses in thecurrent transformer, and thus will cause the current transformer windingto open. However, the CT is Class lE device and the burning of itswinding will not degrade the primary insulation because the window typeCT does not touch Class 1E bus bars. This failure will not affect ClasslE bus which is on the primary side of the tranformer. The watthourmeter function is not safety related and thus can be lost.

2.3-1


A failure of this non-Class lE device may cause a short circuit in thewatthour meter circuit. This may result in the shorting of C.T. secondarycircuit. Shorting the current transformer secondary winding,- however,would not affect the bus because it is a constant current source which isindependent of the load in the secondary winding's circuit.

If the short occurs on a potential circuit, then the 1E source isprotected by both primry and secondary fuses in the potential transformercircuit. See Figure 2.3-4, Fuse FU-H1, 2 Amp, and Figure 2.3-3, FusesFU-Xl and FU-X2, 10 Amp each. Ioss of fuses in secondary side ofpotential transformer will not degrade any other safety function.

Grounded Condition

A failure of the watthour meter may lead to a grounded condition. Thecurrent transformer, which lies in the circuit pathway between the meterand the bus, is already grounded and therefore the fault current will belimited and prevent any adverse effect on Class 1E bus. Thus, Class lEbus will not be degraded.

If the ungrounded side of the CT or PT is faulted to ground, theinstrument transformer is shorted and the analysis of "Short CircuitCondition", above, applies.


None.

5. CONCLUSION

The failure of this non-1E device may cause a malfunction of the watthourmeter non-Class lE indicating function. However, the analysis demon-strates that the fault in the watthour meter circuit will not adverselyaffect the Class lE bus.'he integrity of the Class lE power supply isnot affected. There will not be degradation of safety function as aresult of opening up the PT secondary fuses or failures of CT.

6. REFERENCES

6.1 GE E/D 807E183TY

6.2 GE Brochure on Watthour.Meter - GEH-2762A

11-2057 2 ~ 3 2

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SECTION 2.4

FREQUENCY METER E22-R612


Frequency meter E22-R612 is identified by PPD No. 163C1157P062 as a GE

type AB-40 with Cat. No. 50-103372ANAN. Figure 2.4-1 shows a schematic ofthe meter. The frequency meter contains an internal transducer whichproduces a dc output signal proportional to the deviation of the period ofthe measured frequency from a fixed, reference period. The transducercompares the period of the measured frequency signal with the referenceperiod in a self-contained timing circuit. The transducer dc outputsignal 'is a series of unidirectional, square-wave pulses, the average ofwhich is measured and indicated on a zero-right, dc milliammeter.Figures 2.4-2 through 2.4-4 depict how the frequency meter is connected tothe Class 1E bus.

~ This device is installed on the seismically-tested panel(Reference 6.3).

~ This device is located in control room environmental panel.

These non-1E devices are connected in associated circuits and areseparated from all non-divisional circuits. Associated circuits aretreated as Class 1E circuits and are maintained within the boundaryof the respective division. Thus, the faults from the external non-divisional circuits will not affect the Class 1E bus.

2. DEVICE FUNCTION

This frequency meter indicates the frequency of the diesel generator 4160Vpower supply.

3. FAIIURE MODES AND EFFECTS ANATYSIS


An open circuit in or at the non-Class 1E frequency meter could render thefrequency meter inoperative. This would not affect the synchroscope(E22-R613), which is connected downstream of the frequency meter, becausethe synchroscope has other circuit pathways which bring power to it. Anopen circuit condition also would not affect the Class lE bus because itwill open the potential circuits which feed the meter. Also, the indica-ting function of the frequency meter is not vital to system safety; itsfunction can be lost.

11-2057 2.4-1


Failure of this non-Class lE device may cause a short circuit. For faultsat or near the meter terminals, secondary 10 Amp (FU-Xl) and primary 2 Amp(FU«Hl) fuses protect the potential transformers that lie in the pathwayfrom the frequency meter to the Class 1E bus by disconnecting the faultydevice.

This metering circuit does not in'elude other safety-related devices orcircuits. Thus, failure of the frequency meter does not degrade theClass lE bus and any other safety function. Opening of these fuses willnot degrade any other safety function.

Grounded Condition

In the event that a failure of the frequency meter causes a groundedcondition, the'ndication function of the meter may be disabled but theClass 1E bus would not be affected. The potential transformers that liein the circuit pathway from bus to meter are already grounded, and there-fore would not fail due to a ground produced by the failed frequencymeter. The Class 1E bus is protected and will not fail. Grounding theungrounded conductor will cause a fault, as is discussed under "ShortCircuit Condition", above.


None.

5. CONCLUSION

The analysis demonstrates that the faults induced by this non-1E devicewill be cleared by opening of the fuses and thus protecting the Class 1Ebus. Non-lE devices so protected will not degrade the Class 1E bus andthus the design provided complies'ith the acceptance criteria ofRegulatory Guide 1.75.

6. REFERENCES

6.1 GE E/D 807E183TY

6.2 GE Switchboard Instruments, Bulletin GEP-302J

6.3 GE Design Record File DRF gH13-61

11-2057 2.4-2

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SECTION 2.5

CURRENT TRANSDUCER E22-K001(FOR AMMETER E22-R607)


The transducer, identified by PPD No. 198B6972P002, is a GE type 4722 withCat. No. 50-472201TFDC. Figure 2.5-1 shows a schematic of the transducer.

~ This device is installed on the seismically-tested panel(Reference 6.3).

~ These devices are located in controlled environment.

2.

These non-lE devices are connected in associated circuits and areseparated from all non-divisional circuits. Associated circuits aretreated as Class lE circuits and are maintained within the

boundary'f

the respective division. Thus, the faults from the external non-divisional circuits will not affect the Class 1E bus.

DEVICE FUNCTION

Current transducer E22-K001 is utilized with ammeter E22-R607 to measureHPCS diesel-generator current. Figure 2.5-2 shows the connection of thecurrent transducer to the diesel generator current transformer and toammeter E22-R607. As shown in Figure 2.5-3, the current transformer isconnected to the Class 1E power supply.


0 en Circuit Condition"

An open circuit in or at"the transducer would render the deviceinoperative, and it may 'also cause the current transformer circuit toopen.'f the primary bus.bars are carrying the full load'urrent thenonly it can cause excessive core losses in the current transformer andthis will cause the transformer winding to burn. However, the transformeris a Class lE device and burning of winding will not degrade the primaryside insulation because the window type CT does not touch the Class lEbus bar. Thus, it will not degrade its Class lE bus on the primary side.The ammeter E22-R607 connected to the transducer will also be disabled.Neither of these devices is critical to the system's safety function, andtherefore their function can be lost. The Class lE bus will not beaffected.


In a short circuit condition in, or at, the device, the components insidethe device mounted on printed circuit boards would effectively insulatethese components and prevent paths to common/ground. Shorting of thesecondary of Tl would not affect the Class lE bus since Tl is supplied bya current transformer which is a constant current source and isindependent of the load in its secondary winding circuit. A short circuit

11"2057 2.5-1

in the secondary side of the current transformer would create a flux inthe opposite direction, which would prevent the transformer from heatingup to a point where it will malfunction. Therefore, the current trans-former will not fail and affect the Class lE bus.

Grounded Condition

In the event that a failure of the transducerin the circuit, the Class lE bus would not betransformer is already grounded and thereforenot affect the function of the transformer or'the ungrounded conductor of the CT will short"Short Circuit Condition", above.

causes a grounded conditionaffected. The current .

a grounded condition wouldthe Class lE bus. Groundingthe CT, as is analyzed under


None.

5. CONCLUSION >,7,,\

The analysis demonstrates that either an open circuit or short circuit inor at the device could result in a current transducer malfunction. Thisin turn could affect the indication of control room ammeter E22-R607(non-safety-related) but would not affect the Class lE bus, and there areno failure mechanisms of this transducer that could adversely affect theClass 1E bus. Loss of- CT will not- disable any other safety function.

6. REFERENCES

6.1 GE E/D 807E183TY

6.2 Transducer Cat. Iog. No. GEA-9799

6.3 . GE Design Record File DRF gAOO-1084

11-2057 2.5"2

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VAR TRANSDUCER E22-K002WATT TRANSDUCER E22"K003METERS (VAR) E22-R608

(WATT) E22-R609


Transducer

Transducer E22-K002 is identified by PPD No. 198B6970P002. This is a GE

type 4724 var transducer, Cat. No. 50-472420MNDDX. Transducer E22-K003 isidentified by PPD No. 198B6970P001. This is a GE type 4723 watt trans-ducer with Cat. No. 50-472320MNDDX. Figure 2.6-1 shows the two-elementwiring diagram applicable to transducers E22-K002 and K003.

Meters

These are GE type DB-40 meters and are weather«tight, switchboard instru-ments with fault band construction.

~ The meters are installed on the seismically-tested panel(Reference 6.3).

~ These devices are located in control room environmental panel.

2.

~ These non-lE devices are connected in associated circuits and areseparated from all non-divisional circuits. Associated circuits aretreated as Class lE circuits and are maintained within the boundaryof the respective division. Thus, the faults from the external non-divisional circuits will not affect the Class 1E bus.

DEVICE FUNCTION

Circuit Connections

Transducers E22-K002 and K003 are utilized with meters E22-R608 and R609to measure HPCS diesel generator vars and watts, respectively.Figure 2.6-2 shows the connection of the transducers to the meters (R608and R609) and Figures 2.6-3 and 2.6-4 show the CT and PT transformers.These Class 1E current and potential transformers are connected to theClass 1E power supply, as shown in Figure 2.6-4.

3. FAIIURE MODES AND EFFECTS ANALYSIS


An open circuit in, or at, the meter will render the devices inoperativeand it may also cause the current transformer circuit to open. If theprimary bus bars are carrying in the full load current then only it cancause excessive core losses in the current transformer and this willcause the transformer winding to burn. However, the transformer is a

Class lE device and the burning of winding will not degrade the insulationbecause the window type CTS does not touch the Class 1E bus bar. Thus, itwill not degrade its Class lE bu's on primary side. The meters R608 andR609 associated with these transducers will also be disabled. None ofthese devices are critical to the system's safety function and thereforetheir functions can be lost. The loss of CT will not degrade any safetyfunction of the system.


A short circuit in or at the device may provide a low impedence path forthe current and will result in excessive current demand. The circuitpathway from E22-K002 to the power supply is protected by a secondary 1

Amp fuse of potential transformer. In the event of a short circuit, thesecondary fuse will open when the current demand is greater than 10 Ampsand this will disconnect the non-Class lE device. The circuit isprotected by this cur'rent limitation which does not allow the current toreach a large enough ampere to trip the fuses, but the fuses provide asecondary precaution. Therefore, the Class lE bus will not be affected bya short circuit in .the E22-K002 transducer. The E22-K003 transducer isconnected to the potential transformer in the same way as the E22-K002transducer, and therefore the same arguments hold for a short circuit inE22-K003 not affecting the Class 1E bus as they did for E22-K002.E22-K003 is also connected to the current transformer which leads to thediesel generator and on to the Class lE bus (same circuit pathway astransducer E22-K001). A short circuit in E22-K003 will not fail thecurrent transformer or affect the Class 1E bus. Therefore, the shortcircuit will not propagate down the circuit path and affect the Class lEbus.

A short circuit in the potential circuit is cleared by the primary (FU-Hl2 Amp fuse or secondary fuses FU-Xl, FU-X2 10 Amps each, at the potentialtransformer. The Class lE circuit is protected and no other safety-related devices are connected to the potential circuit (see Figures 2.6-3and 2.6-4). Opening of these fuses will not cause degradation in anyother safety function.

Ground Condition

In the event that a failure of transducers E22-K002 and K003 causes agrounded condition in the circuit, the Class lE bus would not be degradedbecause both the Class 1E current and potential transformers are alreadygrounded, which limits the fault currents.

4,

The ungrounded conductor of the CT or PT is faulted to ground, theinstrument transformer is shorted, and the analysis of "Short CircuitCondition", above, applies.

RECOMMENDED CHANGES

None.

11-2057 2.6-2

5. CONCIUSION

The analysis demonstrates that a var or watt transducer malfunction couldaffect the non-safety-related indication of control room meters E22-R608and R609, respectively, but would not affect the Class 1E bus. The BKAaffirms that there are no failure mechanisms of these transducers thatcould adversely affect the Class lE bus.

6. REFERENCES

6.1 GE E/D 807E183TY

6.2 Transducer Cat No. GET-6522

6.3 GE Design Record File DRF fjH13-61

11"2057 2.6-3

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SECTION 2.7

SYNCHROSCOPE E22-R613


Synchroscope E22-R613 is identified by PPD No. 163C1157P063 as a GE typeAB-40 two-phase switchboard synchroscope, Cat. No. 50-106452AAAA.Figure 2.7-1 shows an illustration of the AB-40 synchroscope.Figure 2.7-2 shows the construction of the synchroscope mechanism.

The synchroscope mechanism consists of a two-phase stator operating inconjunction with a movin'g-iron element which has an independent potentialcoil. The two-phase winding is connected to one phase of the incomingmachine and produces a rotating field. The potential coil is connected tothe corresponding phase of the running machine and the moving vanes arepolarized by the resulting field. The action of these two fields is suchthat the pointer will indicate the phase difference. Figures 2.7"3through 2.7-8 detail the synchroscope connection to the Class IE bus.

The synchroscope coils,.are insulated and are electrically isolated fromthe meter case. These coils are encapsulated, providing additionalinsulation and environmental protection. The only moving part in thesynchroscope is the moving-iron element (see Figure 2.7-2). The synchro-scope has a dielectric withstanding strength of 2,600 volts for oneminute. The synchroscope is used only during the diesel generator testmode, and is normally not connected to Class 1E bus.

This device is located in controlled environment.

Identical synchroscope was installed on the seismically-tested panel(Reference 6.3).

~ These non-1E devices are connected in associated circuits and areseparated from all non-divisional circuits. Associated circuits aretreated as Class lE circuits and are maintained within the boundaryof the respective division. Thus, the faults from the external non-divisional circuits will not affect the Class 1E bus.

2. DEVICE FUNCTION

The synchroscope indicates the comparative status of the phase rotation ofthe generator and off-site power sources.



A failure of this non-Class 1E device could cause an open circuit, whichwould cause the synchroscope to malfunction. An open circuit would notaffect the voltage meters (E22-R611 and R614) or the frequency meter(E22-R612) because they lie between the synchroscope and incoming power.

11-2057 2.7-1

The synchroscope is used only during the diesel generator test mode andtherefore its function can be lost.


The only potential failure mode that could affect the bus was postulatedto be shorting of the field or potential coils. In the event a short doestake place, the circuit pathway is protected by secondary (10 Amp) FU-X1,Figure 2.7-7, and primary (2 Amp) FU-H1, Figure 2.7-4, fuses before andafter, respectively, the potential transformers that lie between thepathway from a synchroscope to Class lE bus. Therefore, a short circuitwill not affect the Class lE bus. A short circuit may affect theindication functions of meters E22-R611, R614 and R612, but these are notsafety-related and their function can be lost. Opening of these fuseswill not degrade any other safety function.

Grounded Condition

In the event that a failure of the synchroscope causes a groundedcondition, the Class lE bus would not be affected. Each of the potentialtransformers within the circuitry are already grounded. Therefore, thiscondition would not affect the Class lE bus.

If the ungrounded side of the potential transformer is faulted to ground,then PT is shorted and the analysis of "Short Circuit Condition", above,applies.


None.

5 ~ CONCLUSION

The analysis demonstrates that the faults induced by the synchroscope willbe cleared by opening of fuse at the secondary of the transformer in thecircuit, thus isolating the non-1E device from the Class 1E power source.If a single fuse fails to open, the additional fuse protection at theprimary side of transformer will provide further assurance of isolatingthe non-1E device from the Class lE bus. Non-1E devices so protected willnot degrade the Class lE bus and thus the design provided complies withthe acceptance criteria of Regulatory Guide 1.75.

6. REFERENCES

6.1 GE E/D 807E183TY

6.2

6.3

GE Switchboard Instruments, Bulletin GEP-302J

GE Design Record File DRF jQ13-61

11"2057 207-2

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SECTION 2.8

GROUND RELAYS E22B"K34, K37

.1. DEVICE DESCRIPTION

Relays E22B-K34 and K37, identified by PPD No. 163C1170P003, are GE ModelNo. 12IAV51D1A.

2. DEVICE FUNCTION

These are induction disk drive relays; the disk is actuated by a potentialoperating coil wound on a laminated U-core. The relay is shown in Figure2.8-1. A schematic of the relay is shown in Figure 2.8-2. The connectionof relays E22B-K34, K37 (59Nl, 59N2) to Class lE Bus C is shown inFigures 2.8-3 and 2.8-4. These relays detect ground fault and E22-K34annunciates in the control room (see Figure 2.8-5). Relay K37 trips thegenerator circuit breaker except under LOCA conditions.

Identical relays were installed on the panels seismically-tested(Reference 6.4).

The relays are located in the panels in controlled environment.

~ These non-lE devices are connected in associated circuits and areseparated from all non-divisional circuits. Associated circuits aretreated as Class 1E circuits and are maintained within the boundaryof the respective division. Thus, the faults from the external non-divisional circuits will not affect the Class 1E bus.



A failure of these non-Class lE devices may cause an open circuit, whichwould render the device inoperative. The ground fault detection andannunciation that these relays provide is not safety related and thereforetheir function can be lost. An open circuit condition will not affectthe Class lE bus.


The HPCS diesel generator and Class lE bus are also protected from a shortcircuit in either of the relays by a 10 Amp fuse followed by an isolatingtransformer. Therefore, a short circuit will not affect the Class 1E bus.

The contacts of relays K34 and K37 cannot be closed or shorted because thecontacts are operated only when the induction disc is actuated by theenergization of the potential operating coil. The potential coils ofany of these relays will be operated only if there is any ground fault inthe generator windings. Therefore, shorting of contacts is not possible.During IOCA, the function of these relay contacts is disconnected.

11-2057 2.8-1

Grounded Condition

In the event that a failure of the relay causes a ground in the circuit,the Class 1E bus would not be affected. There is a connection to groundjust before the isolating transformer. Therefore, the grounded conditiondoes not adversely affect the Class lE bus.

In all of the above cases, the .IOCA disconnect or fuse protectionresistors) will disconnect the device in fault condition and thus provideadequate protection to Class lE power source. This complies with theNRC acceptance criteria of Regulatory Guide 1.75. The safety relatedfunction is not degraded.


None.

5. CONCLUSION

The analysis demonstrates that the faults induced by these non-lE deviceswill be cleared by openi'ng of fuse protection and thus will provideisolate the non-1E device from the Class 1E bus. Non-1E devices soisolated will not degrade the Class lE bus and thus the design providedcomplies with the acceptance criteria of Regulatory Guide 1.75.

6. REFERENCES

6.1 GE E/D 807E183TY

6.2 PPD No. 163C1170

6.3 Voltage Relays, GE Bulletin GEH-1814A

6.4 GE Design Record File DRF

jg22-14'1-2057

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SECTION 2.9

Switch E22B-S01E22B-S12


The switch identified by PPD No. 249A1471P002 is a GE type SBM controlswitch (see Figure 2.9-1). The voltmeter switch is connected between thevoltmeter and the potential transformer. See Figures 2.9-2 through 2.9-5.The switch has a molded black phenolic knurled handle. The standardescutcheon is a molded black phenolic with eight positions. The silver-to«silver contacts of the SBM switch are of double break design. Contactsare positively positioned and maintained by a detent wheel mounted on asquare shaft and acted upon a spring loaded roller arm. Terminal connec-tions are brought to the corners of each stage where screw connections aremade. Contacts are break-before-make (e.g., contact 1 opens beforecontact 2 closes).

All contacts are well insulated from each other and from ground by moldedblack phenolic. The switch assembly is subjected to a Hi-Pot test of2,500 volts terminal-'to-case and terminal-to-terminal. The silver-to-silver contacts of the SBM switch are of double break design which reducesarcing and subsequent pitting of contacts. Each contact is operated by adouble surface arm, one surface for closing, the other surface foropening. The contacts are non-overlapping (break-before-make); thus, if acontact welded shut,'he switch position could not be changed, whichprecludes phase-to-phase shorting.

'he switch is located in controlled environment.

~ Identical switches (SBM PPQ$ 145C3049) were installed on the panelsseismically-tested (Reference 6.3).

, ~ . These non-lE devices .are connected in associated circuits and areseparated from all non-divisional circuits. Associated circuits aretreated as Class lE circuits and are maintained within the boundaryof the respective division. Thus, the faults from the external non-divisional circuits will not affect the Class lE bus.

2. DEVICE FUNCTION .

This is a voltmeter switch for diesel generator voltmeter R610 8 R615.



A failure of this non-Class 1E switch could cause the contacts to remainin the open position. This will cause the voltmeter (E22-R610 6 R615) tolose its indication function. Since this function is non-safety-related,the meter's function can be lost. An open circuit, however, will notaffect the Class 1E bus.

2.9-1


Any short circuit in the voltmeter selector switch will be cleared by thesecondary and/or primary fuses in the potential transformer circuit. See

Figures 2.9-3 and 2.9-5. The shorting of the contacts will not affectany safety related function or equipment.

Grounded Condition

A failure of this switch could cause a ground in the circuit. This maycause the devices that lie between the switch and the Class lE potentialtransformer (PT) to be inoperative, but since the PT is protected on

primary and secondary side by fuses, it will not degrade the Class 1E bus.

A ground on the ungrounded conductor will cause a short circuit, asanalyzed under "Short Circuit Condition"., above.


None.

5. CONCLUSION

A malfunction of the switch could affect the phase voltage indication(non-safety-related function), but would not affect the Class 1E powersupply. The FMEA affirms that there are no failure mechanisms of theseswitches that could affect the Class 1E bus, and also will not. degradeany safety function.

6. REFERENCES

6.1 PPD No. 249A1471

6.2 GE E/D 807E183TY

6.3 GE Design Record File DRF f/H13-61

11-2057 2.9-2

~0

2:562

PANEL 250 NLX.

.93S

2.625 HlGH x 2,372 ViOK

2.562~~

F'igure ~.9-> GE Type SBM Control Switch

4~IIIIIVIIIIIIICS

~I~ WIHHI~~IHHIHI~

Qt \. ~Wtl~~H

ggKgal ar ~,~ I,

~OO IHH HHIHH HIHH

H WII N ~II I~ I ~

~I~ I

~Ip

RKA

j QHH ~ I ~ ~

~I~ ~

~ HH

NH~eIIrIHIIWHHH~HI%H~

~ ~ ~

IIHg

IIIIMAe%HI

FIGURE 2.9-2. SWITCHES E22B-SDl AND E22B"S12 CONNECTED TO

VOLTHETERS E22-R610 AND E22-R615, RESPECTIVELY

HPCS-PS E/D 807E183TY (HST 12)

~ ~~ ~

~ ( ~ . ~

s

~~ QPtlZ 5T5TleA Arg legs

M KL!

~ ~

.sh

I!II iSh« iss tsa

~

~

~]004$66 Ft4,

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los

cai so!

CC! f0!

Ssg~ fhs Ssvgrt

«lies

PsV i~we tWsa~ Et ~~l

ssc 'j~~ ~ ~

FIGURE 2.9-3. FUSES FOR VOLTHETER SELECTOR SMITCH E22B"S01HPCS PS EID NO. 807E183TY, SHT 9

I ~ 4

„(UI

I

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SECTION 3.1

SIGNAL RESISTOR UNITS

1. SYSTEM APPLICATION

E51A-SRUlE22A-SRU1E12A-SRU3A, 3BE12A-SRU1A, 1B, 2A, 2B


PPD: 195B9537

PPD: 193B1435

Signal resistor units identified by PPD No. 195B9537 are Bailey type 7660SRUs (schematic diagram shown in Figure 3.1"2), and signal resistor unitsidentified by PPD No. 193B1435 are Bailey type 7661 SRUs (schematicdiagram shown in Figure 3.1-1).

3. DEVICE FUNCTION

The SRUs are used to convert a signal from current to voltage and to limitthe current. SRUs E12A-SRU1A, 1B, 2A, 2B, 3A, and 3B do not perform anysafety function. SRUs E51A-SRU1 and E22A-SRUl are used in circuit performingsafety function.

4. JUSTIFICATION OF DEVICE APPLICATION

These SRUs are identical to nuclear-safety-related SRUs described byPPD 9184C5812 (both sets are Bailey type 766 SRUs utilizing theidentical components).

Each SRU consists of terminal board and wire wound resistors.Potential fault paths are current-limited in the SRUs by seriescomponents. The current-limiting components will open on excessivecurrent demand, thus disconnecting the faulty device from Class 1E

power. Short circuit of resistors is not a credible failure.

The terminal boards are diallyl phthalate and have a dielectricstrength of 2,200 Vac rms.

The resistors are all fixed wire wound resistors that are epoxyencapsulated with a dielectric withstanding strength of 1,000 voltsminimum.

Mechanical stresses. Identical SRUs were installed on panels thatwere seismically tested per IEEE 344-1975 to greater than 15g and didnot adversely affect the power supply (Reference 6.1).

Environmental stresses. SRUs are located in a Class lE HVAC environ-ment which is less severe than the maximum operating temperature ofthese units (1204F). The current-limiting resistors in the SRU arefunctionally rated to 300 F and will be current«limiting at evenhigher temperatures.

3.1-1

This device is identical to the device of the same equipment partnumber used in the various BWR 4's, 5's, and 6's that have beenoperating over the past fifteen (15) years. GE is not aware of anyfailure attributable to this device and its connection to theClass lE equipment or source.

5. CONCIUSION

It is concluded from the above that the non-1E SRU's (195B9537 and193B1435) do not possess any inherent failure mechanism different from thenuclear safety related SRU (184C5812) that will jeopardize the Class 1E

power source and the safety related function.

. 6. REFERENCES

6.1 GE DRF AOO-0794-2 (Control Room Panels)

11-2057 3 ~ 1 2

JSO1%V+

25p

II 4-20I

IMA'RIES.

1-50'5I

I OPT<QtJARSHIE.I Q

IQ f

r~g~ m ~ +f32-160 MV

lO COHPuTER

SHIC ICI DRAINwiac Cowu ECTTH]$ E~p ONav~ S.C.

swsva~ se~u cax~o~

Figure 3.1.1 Bailey Signal Resistor Unit Schematic Diagram.

Catalog No. 766110BAAA2.

+44VOC IVISIGNAI. COMMON QUS

INST, N0.4

INST. N0.3

INST. NO 2

+INST. NO. I

+ 4VOC

Q)<

O))

O~

Q8Qr

Q4

Q~

Ql)

)$0lLI

Qia

Qii-

Qe-

Qo-

QI-Qr-Qo-

Qa-

oi ~

SC

XMTR NOi 4

XMTR NOi

3'MTR

HO 2

+XMTR

4 - NO. I

Figure 3.1.2 Bailey Signal Resistor Unit Schematic Diagram.Catalog No. 766000AAM1.

SECTION 3.2

JUNCTION BOX


C72A-JB103) B22H-JB402-407E12-JBl-9) 104, 109; E21A-JBl"4) E22A"JB1-4


PPD: 235A1543AA

The junction box identified by PPD No. 235A1543AA consists of an enclosure(pull box) made by Hoffman (ASE 6x6x4) and GE terminal board assemblies(Type CR151). The pull box is identified by GE PPD No. 235A1322P002 andGE terminal board assemblies are identified by GE PPD No. 175A9132. Theenclosure boxes are made of steel. Terminal boards are phenolic withscrew terminals.

3. DEVICE FUNCTION

The junction box is used as an interconnection point that provides electricalseparation of adjacent connections on the terminal board which is insulatedfrom the junction box enclosure.


The junction box is a passive device that contains a CR151 terminalboard assembly and is grounded. The terminal boards are enclosed inthe steel pull box which protects them against externally inducedshorts. They are specifically designed to provide electrical separ-ation of adjacent connections and to be insulated from the junctionbox enclosure. The terminal boards are made of phenolic, with adielectric strength greater than 1,500 Vac zms (Reference 6.1). Boththe junction box and the terminal boards are U.L. listed.

Mechanical stresses. Similar junction boxes (234A1533AA) withterminal strips were installed on panels that were seismically testedper IEEE 344-1975 to greater than 15g and did not adversely affectthe power supply (Reference 6.3).

Environmental stresses. Junction boxes are located in areas wherethe ambient environment is less severe than the maximum operatingtemperature of these devices - 250-300 F (Reference 6.2).

This device has been used as an interface between field cables andPGCC cables since its concept in 1972. Therefore, it has been usedfor this purpose in various BWR 4's, 5's, and 6's that have beenoperating or had power applied over the past ten (10) years. GE isnot aware, of any failure attributable to this device and its connectionto the Class lE equipment or source.

11-2057

5. CONCLUSION

It is concluded from the above that since the junction box is a passivedevice and since it possesses no inherent failure mechanism, it will notjeopardize the Class lE source and any safety related function.

6. REFERENCES

6.1 GE, General Purpose Control Department, Bloomington, Illinois(309)662-4311 - Rich Mote (Engineering)

6.2 Mechanical Engineers Handbook (copyright 1958)

6.3 GE Design Record File DRF jjAOO-794-5

11-2057 3. 2"2

SECTION 3.3

RESISTORS


B22C-R01-R028B35A-R03AB-R06ABB22H-R01-4E12A-R114AB, R115AB, R111-113, R201-206E22B-R01A, R01-04E22A-R21, R22


PPD: 145C3232

PPD: 234A9775

Resistors identified by PPDs 145C3232 and 234A9775 are MIL-R-18546, typeRE wire wound (150 to 250 ohms, 5-watt maximum) and MIL-R-22 adjustable (1to 394K ohms, 75-watt). Resistors are used as voltage-dropping andvoltage-limiting passive devices. Figure 3.3-1 shows the generic

fixed'ire

wound resistor identified by PPD No. 145C3232. Figure 3.3-2 showsthe generic adjustable wire wound resistor identified by PPD No. 234A9775.

3. DEVICE FUNCTION

The resistors are used as voltage-dropping and current-limiting passivedevices in circuits powered by 1E power source. Resistors B22H-R01, 2, 3and 4 are used in divisional circuit to perform safety-related functions.All other 'resistors do not perform any safety function.


Both the. fixed and adjustable wire wound resistors provide current-limiting for series components. The epoxy 'encapsulated fixedresistors and the vitreous enameled adjustable resistors each have adielectric withstanding voltage of 1,000 volts rms minimum. If theresistor open circuits, it will not affect the bus. Short circuit isnot a credible failure of the resistors.

Environmental stresses: Resistors are located in a nominal environ-ment which is much less severe than the maximum rated operatingtemperature () 300 F for both fixed and adjustable).

Mechanical stresses: EDL 368X514AD, Rev. 18 (DRF H13-61), liststhese resistors and thus the resistors were part of the seismic testand did not fail in a manner that degraded the Class 1E equipment orsource. Seismic test per IEEE 344-1971 and 1975 to greater than 5gwas performed on Panel H13-P601 (Reference 6.1).

This device is identical to the device of the same equipment partnumber used in the various BWR 4's, 5's and 6's that have beenoperating over the past fifteen (15) years. GE is not aware of anyfailure attributable to this device and its connection to theClass lE equipment or source.

3.3-1

5. CONCLUSION

There is no failure mechanism inherent to these resistors different fromClass 1E component that could adversely affect the Class lE bus and thesafety-related function.

6. REFERENCES

6.1 GE DRF H13-61

11-2057 313 2

NCIIA.)

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334 .d 4d 420

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I.~ 12

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.O50 .2d2

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.102 .CRIT 412

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.IDT .444 . 404

figure 3.3.1 Generic Resistor, Fixed, Wire Mound.(PPD Ho. 145C3232, Rev. 8).

. L4 I Oh

3 t4kCES

, 44 IEF

,562 AEF

. lb'IP— J~ ~hCK:(W HAA SI"lEiSIZE)

REF I

6 00REF

6.7S0REF

0

SPEC IF IChTIOIS.t&lf1 Ahull'CC 75 VATt5 - FAKE AIIl AT 40 C

DESI STANCE TOLEMeCE: +104

Figure 3.3.2 Generic Resistor, Adjustable, Mire Mound.(PPD No. 234A9775, Rev, 3).

SECTION 3.4

CAPACITOR


B35 C3A) 3B~ 4A j 4B~ 5A~ 5B) 6A) 6B


PPD: 234A9933P105

The capacitor identified by PPD No. 234A9933P105 is a fixed, polyesterfilm, rated at 600 Vdc and 1 MFD. The TRW-X683 version of this capacitoris shown in Figure 3.4-1. The construction is non"inductive winding,metal-enclosed, and hermetically-sealed.

3. DEVICE FUNCTION

The capacitors are used in conjunction with a resistor in the recircula-tion pump operation circuitry as suppressors around relay coils. Thesecapacitors do not perform any safety-related function.


Each of the capacitors is current-limited by a series resistor.There are no mechanisms for exceeding the rated voltage of 600 Vdc(the Class lE bus is 125 Vdc). The capacitor is hermetically-sealedwhich effectively insulates it and prevents random paths to common/ground. Even if the capacitor (B35A-C3,4,5,6A or B) is shorted,. thecorresponding 47 ohm resistor (B35A-R3,4,5,6A or B) would limitcircuit current (see Figure 3.4-2). If the capacitor open circuits,it will not have any effect on the bus and the safety function of thesystem.

Mechanical stresses. DRF H13-37 review indicates that the identicaldevices were installed on panel H13-P628 (EDL 368X532AD) that wasseismically tested and did not adversely affect the power supply andthe safety related function.

Environmental stresses. These capacitors are located in a Class 1E

HVAC environment which is less severe than the maximum rated opera-ting temperature of the capacitor (2574F). TRW-X683 capacitors aretemperature and immersion cycling tested to meet 3.13 of MIL-C-18312and are moisture resistance tested to meet 3.16 of MIL-C-18312.

This device is identical to the device of the same equipment partnumber used in the various BWR 4's, 5's and 6's that have beenoperating over the past fifteen (15) years. GE is not aware of anyfailure attributable to this device and its connections to theClass lE equipment or source.

11-2057

5. CONCLUSION

Failure of the capacitor could affect the suppression function aroundlogic relays in recirculation pump motor system which is not a safety-related function. The capacitors have no inherent failure mechanism thatcould adversely affect the Class lE,bus. From the above, it is concludedthat the non-lE capacitors will not jeopardize the Class 1E bus and thesafety related functions.

6. REFERENCES

6.1 GE Design Record File DRY/ H13-37

11«2057 3.4-2

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~ Hfgh tnsutatlan 1aglgtanca

SEC)lrClTJD)25hews ootlstsece: Oroct ~ I taoa 25,000 hegorva e>lcrotw»s st 25oc iwlOe al ce» ool occoee 50.000 reegoae> ~ .

Roses factv> toss the I'u> «r>eh vossvrog st v ratorreg Io 100077) sr Ier coeocrtohco vorvoc ve to o>N I»eros>og 1.0 a14 ol ts cg«C.her>sort I>cote> Ihoe 1.0 vrg rococo>So oi 00 ~ Irl.sacowe»e seogc> fv>r Nroe re>togo lre»> 55oc to +12$ oc.~4 rr>seas acr>var. Sro«ove rol>sic roc>a» so. )IN. 4N o>N 000 rolls.~ >ol>ccl ~ > ~ o> ~ »oo> ~ oo ~ eeoc>ol ooc>ga aoc> ~

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Fiaure 3.4.1 TRW-X683 Capacitor.

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FIGURE 3.4-2. EXQfPLE OF CAPACITORS (B35 A-C3,4,5,6 A,B) INCIRCUIT CONNECTED TO CLASS IE BUS; DIG 761E791TY(SHEETS 29 8 30)

SECTION 3.5

RECEPTACLE


B22C-Ol, J02E12A-J01E21A-J01E22A"J01E51A-J01


PPD: 159C4374P181S

The receptacle identified by PPD 159C4374 is a socket-type connector with"Poke Home" contacts similar to MS Type 3100. The receptacle is a generalpurpose connector manufactured by Bendix, Amphenol, or Cannon, built toMilitary Standard MIL-C-5015. (Dielectric withstanding voltage of1500 Vac RMS minimum and insulation resistance of 100 megaohms.)

The electrical connector is resistant to moisture, corrosion, sand anddust intrustion, shock, vibration and temperature. The connector insertutilizes poke home contacts in a diallyl phthalate or neoprene rubberdielectric material. The receptacle is illustrated in Figure 3.5-1.

3. DEVICE FUNCTION

As depicted in Figure 3.5-1, the receptacle provides circuit interfacebetween wires/conductors or cables for panel, device or equipment inter-connections. The mating connector inserts utilize poke home contactswithin receptacle body to provide circuit continuity.


Passive Device:

The receptacle is a passive device and has no moving components/partseither in energized or deenergized state of the circuit(s).

Mechanical Stresses:

Per EDL 368X526AD, Revision 13, it is demonstrated that the identicalparts were installed on Panel H13-P618 which was seismically testedper IEEE-344-1971 and 1975 to seismic level of 2.lg longitudinal,3.5g lateral, and 1.0g vertical, and did not adversely affect thepower supply (Reference 6.1) and the safety related function.

Environmental Stresses:

These receptacles are located in a Class 1E HVAC environment which isless severe than the maximum operating temperature of these receptacles(185~F).

11-2057 3.5-1

Operating Experience:

This device is identical to the device of the same equipment partnumber used in the various BWR 4's, 5's and 6's that have beenoperating over the past fifteen (15) years. GE is not aware of anyfailure attributable to this device and its connections to theClass 1E equipment or source.

5. CONCIUSION

The receptacles are passive devices and perform no active safety function.Based on the above justification of the device application, it is con-cluded that there is no failure of the receptacle which could'affect theClass 1E bus and the safety-related function.

6. REFERENCES

6.1 GE DRF H13-42

11-2057 315"2

CDOOO

FIGURE 3.5-1 RECEPTACLE PER PPD NO. 159C4374

SECTION 3.6

DIODE

SYSTEM APPLICATION

C72A"CR3A, CR3B, CR4A, CR4BE12A"CR01 to CR13E21A-CR01 to CR17

DEVICE DESCRIPTION

176A1572P004

The diode identified by PPD No. 176A1572P004 is a JEDEC Cat. No. 1N4004which is equivalent to the GE 1N5060. The GE diode is a 2.5 amp rated,axial-leaded, general purpose rectifier, with dual heat sink construction;the silicon pellet PN junction is enclosed in solid glass; no organicmateeials are present within the hermetically sealed diode. Figure 3.6-1functionally illustrates the PN junction.

Figures 3.6-2A, -2B and -2C show diodes E12A-CR1 through CR12 connected 'totrip units in E12A-Z4, Z5 and Z6 and to relay coils E12A-K4B, E51A-K74Band B22C-K56B. Figure 3.6-2D shows diode E12A-CR13 connected to Class lEbus (125 Vdc) in isolator card. Figure 3.6-3 shows the Class 1E 24 Vdcpower supply E12A-PS2 and 120 Vac Class 1E Bus B. Figures 3.6-4A, -4B,-4C and -4D show diodes E21A-CR1 through E21A-CR14 connected to trip unitsin E21A-Z1, -Z2 and -Z3 and to relay coils E21A-K4B, B22C-K56A, E12A-K43and E51A-K74A. Figure 3.6-5 shows the Class lE 24 Vdc power supply(E21A-PS2) to diodes E21A-CR1 through CR14 and the 120 Vac Class 1E Bus A.Figures 3.6-6A, -6B and 6C show diodes E21A-CR15, CR16 and CR17 connectedto trip units in E21A-Z4 and to relay coil E21A-K40. Figure 3.6-7 showsthe Class 1E 24 Vdc power supply (E21A-PS3) to diodes E21A-CR15, CR16 andCR17 and the 120 Vac Class 1E Bus A. Figure 3.6-8 shows diodes C72A-CR3A,CR3B, CR4A and CR4B in the end-of-cycle recirculation pump trip circuitry.Figure 3.6-8 also shows the 125 Vdc Bus A and Bus B Class 1E power supplies.

DEVICE FUNCTION

The E12A and E21A diodes are used as blocking diodes in trip unit "INCALIBRATION OR GROSS FAILURE" and "OUT OF FILE OR POSER LOSS" alarmcircuits. The C72A diodes are used in the end-of-cycle recirculation pumptrip (part of RPS) circuits for blocking back feed back from trip coils.Diodes in these circuits are used in safety related functions. E12-CR13is used in output optical isolator card in safety related function. Diodein this application protect the isolated card.

JUSTIFICATION OF DEVICE APPLICATION

~ The IN4004 diode will block current unless subjected to a reversevoltage of 400 volts (the maximum available in any of the circuitsdiscussed is 125 Vdc nominal). Failure of the E21A or E12A diodessuch that they conduct in the reverse direction could cause erroneousenergizing of the relays discussed in Paragraph 2 fed by these diodes

3.6-1

and damage the trip unit function. Open diode condition couldprevent gross failure or card out of file functions. Failure of theC72A diodes such that they conduct in the reverse direction couldcause erroneous indication of the status of the recirculation pumpcircuit breakers and damage the relay logic contact function. Anopen diode condition could prevent trip of the recirculation pumpcircuit breakers. An open or short circuit failure of any of thediodes will not degrade their lE power source.

Mechanical stresses. Review of DRF H13-42 indicates that theidentical diodes were installed on Panel H13-P618 (EDL 368X526AD Rev.13),. that was seismically tested per IEEE 344-1971 and 1975 to theseismic level of 2.1g longitudinal, 3.5g lateral, and 1.0g verticaland did not adversely affect the power supply (Reference 6.1) and .

safety related function.

Environmental stresses. These diodes are located in a Class lE HVACenvironment which is less severe than the maximum operating tempera-ture of these diodes (212 F).

This device is identical to the device of the same equipment partnumber used in the various BWR 4's, 5's and 6's that have

been'peratingover the past fifteen (15) years. GE is not aware of anyfailure attributable to this device and its connections to theClass lE equipment or source and the safety related function.

5. .CONCLUSION

There is no failure mechanism inherent to these diodes different fromClass lE components that could adversely affected the Class 1E bus and thesafety related function.

6, RFZERENCES

6.1 GE DRF. H13"42

11"2057 3.6-2

~ ~~ ~

P ~rm

~ ~~ ~

P <IA'

~I

malene&

le)

FIGURE 3 6-1 JUNCTION DIODE SHOWING EFFECTS OF

VOLTAGES OF DIFFERENT POLARITY

ttlr FRCSSfvtss ISSs IItsI et 5 sots 0lt) 5)

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Oa ssO500 Ilt) l-)

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Cst tst5 5 ~lt) l-)

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ce wfoelt) l)

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lt) l )

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NOTES:

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1. Reference 8 is 807E173TY, Rev. 18 (RCIC ED)2. Reference 11 is 807E155TY, Rev.'22 (ADS ED)

FIGURE 3.6"2A DIODES E12A"CR1 THRU CR12 CONNECTION TO TRIPUNITS IN E21A-Z4, Z5, AND Z6 AND TO RELAY COILSE12A"K48, B22C-K56B, AND E51A-K74B(PER 807E170TY, REV. 25, SH. 23 - RHR ED)

tltaH45

~ S lO

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REF 4

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NI'%a P4lt C

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tN4%4ltta Wllthl OtatNtRoltt%TRIP uHIT cs) ARC WIICNTRIP uHIT C Q)IN CAL4% 4ROSS ouT otFILC ok

plAILuac occuRs paw tR FAILS

FIGURE 3.6-2B DIODE E12A-CR10 CONNECTIONS TO TRIP UNITSIN E12A-Z5 AND TO RELAY COIL B22C-K56B{PER S07E155TY, REV. 22, SH. 7 - ADS ED)

r@iacctcIO-IO

act taIO II

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OAAnoN oa000 ~ ~ rAILUI0

ac~aascoa Vrsta ~Ncso tova tair UNITovt

out or riceON aOIICN IOSS

FIGURE 3.6-2C DIODE E12A-CR5 CONNECTION TO TRIP UNITS.IN E12A-Z6 AND TO RELAY COIL E51A-K74B

(PER 807E173TY, REV. 24, SH4 13 - RCIC ED)

~tttttt IIICICS IIUICIIVI 'I

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ttfb P705A,Jbtd3ml IO HI3 F6294

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I RELAY II LOGIC I

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I 22I 8 EID

r------I

I

I SEE AT 7,dStt S

I II II

II

6,

Ib Z

~66 ~ I 666 ~Ht6 Peal

CkT 2RHSD~2

FIGURE 3.6-2D DIODE E12A-CR13 CONNECTION TOCLASS lE BUS (125VDC)RHR E/D NO. 807E170TY

CRT P.RES'5l.Qo7

I24 VACSEE FICo J

SH4F45

(Ll TREF)

44KSS

al

5252

IHAC /OC

POWER SUPPLVP52

(+)I 4

24VDC I REP7sg I REF 4 I I REF II I

82IC-KIB

F37< FSS < F3b ~ID AMP I AKP IO AMP

FSS1I'O

AMP

rF62~10 AMP

SH 25 za Q za Q za

COK COK COK

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I25 VDCSEE FIC 4

SH 4CRT NO tRHS444

-~—{ J--ri PSII+) TREF)

I III3-PCIB

FlG. IIPOWER DISTRIBUTION FOR

OIV 2 TRIP UNITS THIS-PBIS)

Jaa.a HIS-PBI4h

FIGURE 3.6-3 CLASS 1E POWER SUPPLY E12A-PS2 (TO DIODES E12A-CR1THROUGH CR12) POWERED BY CLASS 1E 120 VAC BUS(PER 807E170TY, REV. 25, SH. 5 - RHR ED)

(B 22 NQQIA ) IB2t-N49IE ) (822-N 5 9 4 A ) (B 22-N5 9 4E) (E2I-N550 ) (E2I NQSI )I

T5 5 9 IO

I

5 9 IO TB 2 d 9 10 d 9 IO4

IT B- 2 d 9 10 T@ d 9 IO f5 6 "j

CRI CR 2 CR3 CR 4 CR5 CRD CR7 CRQ CR9 CRIO CRII CR I2 CRI CQ4

K45 K 45

R

CREF IO+ REF 5 ++REF 9 +iLSH 7%~i

(EEI-N652)

TRIP

tSH If l ISH 2'Z

(EBI-N060) (EIX-N6$3A)EHEROIZES WHEN

VIIIT.IN ChLIBRATION OR GROSS FAILURE

BI ~ Bl BlK45 K45

B4

DE- ENERCI LES WHENTRIP UNIT OUT OF FILE OR POWER LOSS

K49

NOTES:

1. Reference 5 is 807E170TY, Rev. 25 (RHR ED)2. Reference 9 is 807E155TY, Rev. 22 (ADS ED)3. Reference 10 is 807E173TY, Rev. 24 (RCIC ED)

~K4Q

REF loSll. I2

FISJ NSJX4a K45

Ts fgfF 9 ICEF5

FIGURE 3.6-4A DIODES E21A-CRl THROUGH CR14 CONNECTIONS TO TRIPUNITS IN E21A-Zl, Z2, AND Z3 AND TO RELAY COILSE21A-K48I B22C-K56A) E12A-K43, AND E51A-K74A(LPCS E/D NO. 807E171TY SH. 7 REV. 18)

TaP INITttl %St

Ta t 8 '9 IOI

Elt ESCA StdTRIP UNIT

( ~s1%IP UNITttl~44b5

9 IO

'TRIP IINITtlt WOW

~ 9 IO ~

we-Jiffy Y

'TRIP IWIITSEE l4OSSA

Tg t 9 $

IIS CRIA

97

lo

Kl ~

5'll% NRIAC CII

OIIcSTA . KSS R

84

OEiENERQZES ENERCI S NCNWNEII Thlt VRITIEI Thlt IIRIT ESI ARE

OMJOE ALE ~h g JR/OR PQS

FIGURE 3.6-4B DIODE E21-CRl, CR4, CR8 AND CR12 CONNECTION TOTRIP UNITS IN E21A-Z2 AND TO RELAY COIL B22C-K56A(PER 807E155TYI REV. 22, SH. 7 " ADS ED)

dLNOdI24.SLNOSI25

'PUFF PRESSTIWIKMITIER

Elt Nstht+) (-)

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Elt-NOSOA

(+> (-)

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(i) (-)

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tlt-NO5bh(~) (-)

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.

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Tb IIIt

'fb

II'RIPUNIT

(Elt NCCOAI'TRlP UNIT

(Klt NCSIA)

Tb IIO

'Tb4 I IO 4 l4 ls

gtlh 2I(REF 5)

Tbls

'TRIP UNIT(r.lt-NCSKA)

Tb IIt

laP UNITfit-I(664A

vhd II.. Tb II It

bl@lith

EIRRQZES ON3

RNR T( FLOWSCIL MT

RANT

blKIRIL

b4

ENERSIXES CN HICHSTCAM SUPPLY Ptt%bWLVKM'ACHITROL

blKllsh.

b4

KNKRQEKS Oll RHR'AINJECTION ~VKS

DIFF PRESSPERMISSIVE TO OPEN

8I

033'IIERGIEES

ON RHR PUMP EI2-COOEA

SIICTION I.INE RES5 ASNOAMALLOW

'TbIt

gt-Ncsth) (Elt NCSOA)

lO

atlh-tl(REF s)

(EIK-NCSIA

Tb 'Tb14 S

(Klt Ncsbh)

'Tbd

SPA AETb1

(Ct!A~CA)+REF 5L.'3

Ktlh

e4DE- CiltSCICKC ou R R SIR CS QQ

TIDPUN'KIT TRIP L$4IT INOF FILR OIC 4UtWNPCAAttR LDSO OR SQOSS

FHLLJRb HI%~'PSXS

FIGURE 3.6-4C DIODES E21A-CR7 AND CR11 CONNECTION TO TRIPE21A-Zl AND RELAY COIL E12A-K43 UNITS IN(PER 807E170TY, REV. 25,.SH. 22 - RHR ED)

I ~

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CSI HisstI ( I

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ts

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CN oacops

filiate

ON fdaaNC IOSSI

FIGURE 3.6-4D DIODES E21A-CR2, CR5, CR9 AND CR14 CONNECTIONTO TRIP .UNITS IN E21A-Z3 AND RELAY COIL E5IA-K74A(PER 807EI73TY, REV. 24, SH. 12 " RCIC ED)

120 yACD<y I UPS BUS A (GILEEII)FIG 4,%H 2,

CKT. LLCL.zcsLMoe

FLO|:Ra,F3

SIS II+~'

'tbl b4

I c/ cA DPOWER SUPPLY

Pb-'5

7CI

fIICEIS5H5

II

rIREF 9SLI 4A

I AC-HIA~1RFP 5

SH tf~~ERAL L2A

I REF IQSH I2E5LA k40

IJ

FI2

IO AMP

CO M f TRIP UNIT2 FILE

CiilbR~TISN

FI3

IO'AMP

COM

4 Qo~/ TRIP l5l!T

2 oFLL.C E

t CLUbRATIILNUNIT

%2

F I4

IO AMP

CO TRIP ULLLT2 FILE E

'ILUbILATIQIULILT J

FIGURE 3.6"5 CLASS lE POWER SUPPLYE21A-PS2 (TO DIODES E21A-CRl THROUGH CR14)(PER 807E171TY, REV. 24, SH. 3 - LPCS E)

( 5 I2-NGGIA)lE2l Nddl ) (E2I NSSS ) I EI2 N&GCIA)

~AIT 8 2 d 9 IO ~ Td d 9 !O ~ Tb d 9 IO ~ TS 8 S IO

I 3

(Edl ~ l4692)

i l

'Tb $ 5 ICI4 'K4

ISH ZZ I'aZ~~REF 5

ISR ZZ57 l

REF ICIf Z IISII lam-uaS2 ~

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CRIS CRI d CR 17

I SH I2, I ISH ZZ.I ESIWGS? I I EI2 NCh7 IL ~ I

K4181

O~84

BI

OIV I SAFETY AS5 0CIATROTRIP UNIT TROUBLE

DE-ENERGI2ES WHENTRIP UNIT OUT ENERGIZES WIIEN

OF Flt. E OR TRIP UNIT IN CALPOWER LOSS OR GROSS FAILURE

DE-ENERGIZE&WHEN TRIP UNITOUTOF FILF OR

POWER LOSS

NIS-PSXS

NOTES: Reference 5 is 807E170TY, Rev. 25 (RHR ED)Reference 10 is 807E173TY, Rev. 24 (RCIC ED)

.FIGURE 3.6-6A DIODES E21A"CR15, CR16 AND CR17

CONNECTION TO TRIP UNITS IN E21A-Z4AND RELAY COIL E21A-K40

'PER 807E171TY, REV. 24, SH. 7 - LPCS ED)

CS LHOdZ52ZCS LQOd 1SS

C d Llf0 d Z84XCS LNOdISS

TRANQ4ITKRKIK. NOSSA

C+) (-)

~Rt54VRKTRANSAITTKRKlt lRSr

(4 ) (-)

44 I ~ CO I t H22.IIOIS

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ILIA

KNERSZES CN OlR hWtttCOKA OCII UN

FREON ASNlESJM

KNKRCCLKS ON&INOCWIJ COCEJI44

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(Klt-uaaSA) CElt NQ5IA) Cygne 8) g Ctlt HCe57)KKIAZ4Al/+

'FIGURE 3.6"6B DIODE E21A-CR17 CONNECTION TOTRIP UNITS IN E21A-Z4(PER 807E170TY, REV. 25, SH. 22 - RHR ED)

15

TRID 'UNIT.{PIS E51&CdO)

II ISTb ll

F 1P Jill H P G U H

TRIO 4 14 15 4 '14

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V HIS-P42 Ih-15

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4115 hVI1039

blKTS

10

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09 09REF. 22

SES VWEN ENeaOISEd ~EHISCHARGE PUMP 5UCTIOH

HIGI4 pRbsb>aoERE ES I5 ESP4HP OISCHARQK +PRESSURE ABOVE

SET POiNT

RCIC PUMP I RCIC WATER LEGcTIGH patscuae ID@~PUMP OISCHARGE

tPRESSURE I OW

I

S) (915«ESI HOSS'' . (91$ E51 HS50)

10 '2 b 0 IO Tbll 2 5 0 I0

ERA-Z4(REF.I 4)

{PlS~ESI-NS52) (9$ fSI-N554)~ 1

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I II0(EfIA-lOII)r" " r-

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QQZI CRQ I HIS-PN5

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btICT4A

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KT+hd4

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I H

RCIC SAFETY RCIC SAFKTYASSOCIATE S ASSOCIATKO

TAID UNITIN TRIP VHITOUTCAUS OR COLS OF F'ILKOR

FAILURE ~KR LOSS

I-ENEIK«IZES

VVHEN'GZC

OIV I TRIPUNIT IN CALISRATION

OK GICOSS FALVRE

OK~OICES WHENRCIC QV I TRIP

UNIT ouf OF FII.EOR ~R LOSS

FIGURE 3.6"6C DIODE E21A-CR16 CONNECTION TOTRIP UNITS EN E21A-Z4(PER 807E173TY, REV. 24, SH. 12 - RCIC ED)

fu)

lXO VACSOHX

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FIGURE 3.6-7 CLASS lE POMER SUPPLY E21A"PS3(TO DIODES E21A-CR15, CR16, CR17)(PER 807E171TY, REV. 24, SH. 3A " LPCS ED)

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SECTION 3.7

FUSES


E12A Fl )'F2

) F8 ) F9 ) F13 ) F14) P20F26"29, F30A,B, F31-34, P35,P37-39, F40-52, F53, P54, P62,P63, EZ (10A), FXX (5A)

E21A-Fl) P2) F5, F6-10, P12-15)F17-19) F20-24

E22A-Pl"6) F7) P8, P9-11) F12"14

E22B-Pl"4, F7

B22C-Fl-10) F13-24) F41"52, F79-88) F113,F114) F120-123

B22H-F13A,B, F19A)B, F62, F63, P79A)B) P86A)B,F90A)B-92A)B) F95A)B

B22-F119) 12B

C72A-P21A)B, F22A,B) P53A,B, F54A,B

E51A"P1-27


PPD: 145C3039

The fuses identified by PPD No. 145C3039 are all Bussmann type MIN withblown fuse indicators. Fuse construction is a current rated alloy or zinclink wi;th plaster-of-paris filler in a fiber case'. Blown fuse indicatorcan be seen through window of the Bussmann type HPC-C fuseholder. Fuseand holder are shown in Figures 3.7-1 and 3.7-2, respectively.

3. DEVICE FUNCTION

The fuse provides current-limiting circuit protection by decoupling thepower source from the load under fault conditions in the circuit. Allthese fuses have been used in various safety related and non-safetyrelated circuits.


~ Fuses have a fusible link which will limit current in the event of ashort in the protected circuitry. The current rated fusible link inthe Bussmann MIN Series fuse is insulated by plaster-of-paris withinits fiber tube case. The fuse is insulated from the panel by theBussmann type HPC-C fuseholder. The fuseholder is phenolic and has a

11"2057 3.7"1

dielectric withstanding voltage rating of 1,800 volts. The MINSeries fuses are voltage rated at 250 volts. The maximum voltagefrom the power supplies is 125 volts. The fuse is designed to opencircuit upon failure and will not affect the bus. Short circuit isnot a credible failure of the fuse.

~ Mechanical stresses. Identical fuses and fuseholders were installedon panels that were seismically tested per IEEE 344-1975 and did notadversely affect the power supply (References 6.1, 6.2 and 6.3) andthe safety related function.

~ Environmental stresses. These fuses are located on panels in a

controlled environment which is usually much less severe than themaximum rated operating temperature of these fuses (1854F).

This device is identical to the device of the same equipment partnumber used in various BMR 4's, 5's and 6's that have been operatingover the past fifteen (15) years. GE is not aware of any failureattributable to this device and its connection to the Class IEequipment or source.'

This device is similar in design and construction to Class 1E part .

(225A6261).

5. CONCLUSION

The fuse does not have any failure mechanisms that can affect the Class lEbus but it will open on excessive current demand.

6. REFERENCES

6.1 GE DRF AOO-1138 (Control Room Panels)

6.2 GE DRF AOO-1084 (Iocal Panels)

6.3 GE Design Record File DRF ijH13-61

There are no failure mechanism inherent to these fuses different fromClass lE fuses that could adversely affect the Class 1E bus and the safetyrelated function.

11-2057 3472

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Figure 3.7-2 Generic Fuseh01der (Manufactured by Bussmann)

SECTION 3.8

TEST SWITCH


E22B-TS5, TS6


PPD: 209A4690

3.

Test switch identified by PPD No. 209A4690P008 is a Westinghouse type FT-1Flexitest switch (see Figures 3.8-1, 3.8-2, 3.8-3 8, 3.8-4).

DEVICE FUNCTION

These test switches are used to isolate the lockout relays (Kl and K36).


~ These test switches are identical to nuclear-safety-relatedWestinghouse test switch (FT-1) described on PPD gDA304A3629P001.

~ Mechanical stresses. Identical FT-1 switches are installed onE22-S004 switchgear panels that are seismically tested per IEEE344-75 and did not adversely affect any of the safety relatedfunction and Class 1E power (Reference 6.2).

~ Environmental stresses.- FT-1 switches are located in a Class 1E HVAC

environment (panel gH22-P028) which is less severe than the maximumoperating temperature of these units (120 F).

~ This device is identical to the device of the same equipment part~ number used in the various BWR 4's, 5's, and 6's that have been

operating over the past fifteen (15) years. GE is not'ware of anyfailure attributable to this device and its connection to theClass lE equipment or source.

5. CONCLUSION

The test switches a'e used as normally closed in the application. Theopening of the switches or isolation function of the test switches isperformed by manual action of the technician/operator. Therefore, basedon the justification, it is concluded that there is no mode of failure oftest switches, which will affect the Class lE bus.

6. REFERENCES

6.1 HPCS P/S Elementary Diagram 828E183TY

6.2 VPF j/5492-22-1 and 5670-190"1

11-2057

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SECTION 3.9

TEST BLOCK

PPD: 163C1192

Test blocks TS1 through TS4, TS7 and TS8 are type PK-2 test blocks with GE Cat.No. 6422120G3. The blocks are used to test switchboard instruments. Testblocks TS1, TS3, TS7 and TS8 are for voltage test, PPD No. 163C1192P002. Testblocks TS2 and TS4 are for current test, PPD No. 163C1192POOI. The PK-2 testblock was qualified for Class lE use in the early part of 1984. The qualifica-tion is contained in DRF gAOO-01825. Therefore, the test blocks do not need aFailure Modes and Effects Analysis.

11".2057 3.9-1

SECTION 3.10

METER RELAY PANEI


C41"ZOlA,B


195B9851G001

The panel consists of a GE Type 195 indicating meter with built-in relay,resistors, terminal boards and fuses provided on a subassembly board. Theboard is powered from the Class lE 'power supplying the SLC pump and thesquib valves through a potential transformer (see Figure 3.10-1 6 2).

3. DEVICE FUNCTION

The meter r'clay panel provides monitoring function of the explosive squibvalves control circuit by indication and annunication of circuit continuity.The indicating meter and relay circuitry is bypassed during operation ofthe squib valves. The monitoring function is not safety related and hasno safety action during squib valve firing but failure in meter relaypanel may degrade the Class 1E bus.


The meter relay panel is located in a Class 1E HVAC environment whichis less severe than the maximum rated operating temperature of thedevice (120~F). The current-limiting components are functionallyrated to 160 F and will be current-limiting at even highertemperatures.

~ Review of DRF AOO-1138N indicator that identical meter relay panelwas installed on a Panel that was seismically tested per IEEE 344-1975(2.38g F-B, 3.4g S-S, 3.4gV). No physical damage was noticed uponsubsequent inspection. Safety related function as Class lE bus werenot degraded. (Ref 6.1)

~ In the normal operating mode, the meter relay panel monitorscontinuity of power to the squibs by measuring a small current thatflows, as shown in Figure 3.10-1. It is in series with (1) threefuses (Fl rated at, 1/4 amp; F2 and F3 rated at 2 amps), and (2) andin series with six resistors which are redundant to the fuses incurrent-limiting circuitry. These fuses and resistors will also

. protect the Class lE power.

A relay meter mechanical failure or electrical malfunction couldcause improper indication and/or opening or closing of the contact'sthat control status lights and annuncition (see Figure 3.10-3).These have no safety function and their improper operation will haveno adverse effect on the power supply to the lights and annunciatorcircuit.

11-2057

5. CONCLUSION

This meter relay panel monitors the continuity of power to the squibvalves and thus perform no safety function. The justification concludedthat since identical meter relay panel was seismically tested and did notdegrade the Class lE bus or safety related function, this meter relaypanel does not possess any inherent failure mechanism different from thesafety related meter panel that will degrade the Class lE bus and thesafety related function.

6. REFERENCES

6.1 GE DRF AOO-ll38N (Limerick, Panel H12-P628).

6.2 GE Bulletin GEA - 7317G "Terminal Boards"

11"2057 3.10-2

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draft 'failure modes & effects analysis of non-1e devices ... · regulatory guide 1.75...

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