title: seismic testing of relays used on npp kozloduy

XA9952843

Title: Seismic Testing of Relays used onNPP "Kozloduy", Unit 5

Contributor: D. Jurukovski

Date:

Seismic Test in « of Relays Used on NPP "Kozloduy". Unit 5

SEISMIC TESTING OF RELAYS USED ON NPP "KOZLODUY", UNIT 5

Dimitar Jurukovski*. Dimcho Mamuchevski**, Snezana Stamatovska***

ABSTRACT

The testing procedure performed for seismic testing of five different types of relays used onXPP "Kozloduy". Unit 5, is presented in this paper. The investigation program, selection andclassification of the tested specimens, selection of the seismic inputs, description of the testingequipment, realization of the considered investigation program, discussion and interpretationof the experimental results, conclusions and recommendations for acceptance of the obtainedresults are the subject and contribution of this short form report. The main intention is topresent the relevant items and considerations refereed to the seismic qualification of theelectrical and mechanical equipment recognized as experimental procedure based on thebiaxial shaking table testing.

FOREWORD

Within the frames of the program of the International Atomic Energy Agency. Vienna,Austria "Benchmark Study for Seismic Analysis and Testing of WWER Nuclear PowerPlants", the Institute of Earthquake,. EngiriefeSrig" and Engineering Seismology - Skopje,Republic of Macedonia, realized the projecf"Seismic Functional Qualification of Electricaland Mechanical Equipment Based on Shaking Table Testing".

The project program for 1997 anticipated seismic tests of relays used in NPP "Kozloduy",Republic of Bulgaria and NPP "Paks" Republic of Hungary.

Presented in this report are the seismic tests performed on five types of relays existing inNPP "Kozloduy", Unit 5.

The tests were carried out in the Dynamic Testing Laboratory of the Institute of EarthquakeEngineering and Engineering Seismology in Skopje in the period June 22 to July 1,1997.

Presented in this report are all the relevant data obtained from the seismic tests on relays type:Pn-8, Pn-23, Pn-252, PM- OS and PT-40.

Institute for Earthquake Engineering and Engineering Seismology. University "St. Cyril andMethodius". Skopje. Republic of Macedonia* Professor D-r of Sc. and Director** Senior Research Engineer. B.Sc. of electronics*"* Assistant. D-r of So..

page 1 /20

Experimental Procedure for Seismic Qualification of Electrical and Mechanical EquipmentBased on Biaxial Shaking Table Testing

Seismic Testing of Relays Used on NPP "Kozloduy". Unit 5

1. INTRODUCTION

Relays as components of systems for automatic protection and signalization in NPP-s areessential elements of different multi-functioning control panels and other control, protectiveand signaling assemblages.

Considering the wide spectrum of application of relays and for the purpose of unifying theprograms for seismic testing of NPP relays, the regulations (standards and guidelines) definecertain main bases, conditions and criteria of testing.

According to the regulations, relays could be divided into two global groups:protective and auxiliary relays.

The conditions under which the relays are tested could be defined according to the siteconditions, the dynamic characteristics of the engineering structure, the conditions ofassemblage of the panel or the rack, the conditions of assemblage of the relays (on the panelor the rack) , or, when such concrete important data are lacking, the tests are performed byprescribed standard testing seismic excitations.

The standard testing seismic excitations have the prescribed form of testing accelerationspectra, while the scaling of the excitation intensity is done according to the local seismicconditions (proof testing) or up to the limits determined by the tested or the testingequipment (fragility testing).

2. TESTING PROGRAM

The testing program was established on the basis of three IEEE standards that are mostrelevant for the realization of the seismic qualification tests of relays:• IEEE Std. 501 -1978 (C37.98), IEEE Standard, Seismic Testing of Relays• IEEE Std. 344 - 1987 (1974), IEEE Recommended Practice for Seismic Qualification

of Class IE Equipment for Nuclear PowerGenerating Stations;

• IEEE Std. 323 - 1983 (1974), IEEE Standard for Qualifying Class IE Equipment forNuclear Power Generating Stations;

The most relevant parameters and conditions that determine the testing program are:• Seismic excitations:• Mounting Conditions• Driving Signals of the Tested Specimens (Voltage or Current).• External Breaking Signals• Duration of the Real Time Seismic Excitations• "Switch ON" and "Switch OFF" Operations• Intensity of the Seismic Excitations• Monitoring of Functional Performances of the Relays

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Seismic Testing of Relays Used on NPP "Kozloduy", Unit 5

Testing program are done in two identical phases:First, the tests are done by simultaneous biaxial excitations, in the L&V directions, and afterthe same testing procedure is done in the T&V directions.

Tests are performed by gradual increase in the intensity of seismic excitations.Excitations are generated with peak acceleration of approximately:0.3 ZPA, 0.6 ZPA, 1.0 ZPA, 1.5 ZPA, 2.5 ZPA and 4.0 ZPA.

ZPA (Zero Period Acceleration of the Testing Spectrum) is considered as nominalintensity, and this value corresponds to the Peak Acceleration value of the scaledacceleration time history, according to the guidelines recommendations.

3. TESTED SPECIMENS

Five types of relays, used at NPP "Kozloduy" Unit 5, were selected for seismic testing. Thesection ASUTP-2 (Automatic Systems for Control of the Technological Processes) atNPP "Kozloduy" made the selection of the following types of relays:

Pn-8, PII-23, Pn-252, PT-40, PM-305

Three samples of each relay type were tested: two new ones (from the stock) and a used one.

Review of the locations, the corresponding Response Spectra (nodal point responsespectra), types of the control panels (where the relays are mounted) and the consideredfunctions of the tested types of the relays is presented in the Table 1.

4. SELECTION OF SEISMIC EXCITATIONS

The correct selection of relevant seismic excitations is an important task and the final choiceshould be made by competent subjects.The following input data were considered during the selection of the seismic excitations:

• Type of tested relays; The selected types of relays are: protective and auxiliary.• Type of control panels; The selected types of relays are used in a different types of

control panels for protection, control and signalization. Up to three different types ofcontrol panels are considered.

• Locations and mode of mounting of the panels and relays: The selected types of relaysare mounted on different locations. Up to four main locations are considered. All selectedtypes of panels are fixed-base mounted, without base isolating elements. Mode ofmounting of the relays on the testing supports is similar to that of mounting the relays inthe control panel.

• Selected Response Spectra: Two sets of SSE (Safety Shut-Down Earthquake) Responsespectra for L, T, V directions corresponding to the two different nodal points(596,700)of NPP "Kozloduy" ,Unit 5, at the same level (13.20 m) are selected.

_______



Table 1.

Selected Types of Relays and Their Locations at NPP "Kozloduy", Unit 5

Selected Relays

Type

pn-8

PIT-23

P n - 252

PT-40

PM-305

Protective

orAuxiliary

P

P

P

P & A

A

Selected LocationsNumber

of thelocation

V 13.20

A 434/1A 435/2A 436/1

V 13.20

A 434/1A 435/2A 436/1

V 13.20

A 434/1A 435/2A 436/1V 13.20

A 434/2A 435/1A 436/2

V 13.20

A 408/2A 408/3

Typeof the

Control PanelHV(WX) 123

HV(WX) 123

HV(WX) 123

JT 15 (2535)

HV(WX)

NodaiPoint

number

700700700

700700700

700700700

700700700

596596

Considered Functions

System "HIIK - IUT"• Control of the

protective valves for thesteam-generatorprotection

System "HITK - HT"• Control and Lock of the


System "HITK - n r "• Control and Lock of the


System rUTI"(Main Circulating Pump)• Control and Lock

ofthe'TLin"(tecnological systemYD10+40D01)

• Signalization of theoil supply system(technological systemYD 50,60)

System "KHII"(Panels for Control andMeasurement Equipment)• Power Supply

Control&Signalization• "In site" control

Note 1: A - Auxiliary Relay; P - Protective RelayNote 2: Nodal Point Number -

Refereed Number from the official seismic analyzes reports

page 4/20



4.1 Creation of the Synthesized Acceleration Time Historiesfor Performing of the Seismic Testing

The seismic testing of the relays are done by application of two different time histories.

The first acceleration time history (symbolically named "SRS") is created based on theStandard Response Spectra shape prescribed by IEEE Standard 501. This shape is presentedon Figure 1. The characteristics of this spectrum shape are derived from the curvecorresponding to 5% of critical damping.• At frequency 1 Hz, the spectral amplitude value is 25% of ZPA.• In the frequency band from 1 Hz to 4 Hz, the spectral amplitudes are increased from 25%

to 250% of the ZPA value.• In the frequency band from 4 Hz to 16 Hz the spectral amplitudes have constant values

equal to 250% of the ZPA value.• In the frequency band from 16 Hz to 33 Hz, the spectral amplitudes are decreased from

250% to 100% of the ZPA value.• In the frequency band from 33 Hz to 100 Hz the spectral amplitudes have constant values

equal to 100% of the ZPA value.

The second acceleration time history (symbolically named "ENV") is created based on theEnvelope Spectrum shape. This shape is presented on Figure 2. The Envelope Spectra iscreated as absolute envelope spectrum covering the six response spectra (L,T,V components atnodal points 596, 700) and "SRS" spectrum. The characteristics of this spectrum shape arederived from the curve corresponding to 5% of critical damping.• In the frequency band of 0.1 Hz to 2.4 Hz, the envelope is defined by the amplitudes of

the mentioned floor response spectra for the longitudinal direction - L.• In the frequency band of 2.4 Hz to 5.0 Hz, the envelope is defined by the amplitudes of

the mentioned floor response spectra for the vertical direction - V,• In the frequency band of 5.0 Hz to 100 Hz, the envelope is defined by the amplitudes of

the Standard Response Spectra Shape (SRS) scaled at 0.25 g Zero PeriodAcceleration.

The both acceleration time histories are calculated by application of the verified methodsbased on the previously defined required (testing) response spectrum and selected accelerationtime history (like real earthquake acceleration) with spectral amplitude characteristics similarwith the required spectrum shape. The calculated time histories are normalized to peakacceleration value of lg = 9810mm/s2). The real intensity scaling is adopted during theprogramming of the testing processes.

As input parameters derived from the local site conditions are the maximal ZPA value (about2500 mm/s2) value of the six selected response spectra corresponding to the nodal points596 and 700 and the official Design Acceleration Time History for the NPP "Kozloduy"location.

page 5/20


Seismic Testing of Relays Used on NPP "Kozloduy". Unit 5xzss8td 501-1978

2

ct

CC

ELf

/

"A 2 5 %

/

/

D/

/

250% r

\

KN

V6

10

;

i

0%

2 3 10 2 3 5

FREQUENCY Hz

100 2 3

5% DAMPING

Figure 1. Standard Response Spectrum (SRS) prescribed by IEEE Std 501

) • I I T l i i 1i

j

/

j

i 1 !

1

/ \

\

1 1

1 " !

\

1 i i 1

1 i _j j . -. , .

\

1.0

Frequency (:iz

Figure 2. Envelope Response Spectrum formed by NPP "Kozloduy" Unit 5nodal points 596 and 700 Floor Response Spectra andscaled at 0.25 g ZPA Standard Response Spectra

page 6/20


Seismic Testing of Relays Used on NFP "Kozloduy", Unit 5

5. TESTING EQUIPMENT

The seismic testing of the relays was performed on the Biaxial Shaking Table system installedin the Dynamic Testing Laboratory in the Institute of Earthquake engineering and engineeringseismology (IZIIS) in Skopje, Republic of Macedonia.

The Biaxial Shaking Table is an integrated system formed by the main electro-hydraulicsystem and the associated systems and subsystems.

The main parts of the integral testing system are:• Biaxial Shaking Table• Computer System for Processing Control, Data Acquisition and Data Processing• Data Acquisition Equipment• Equipment for Calibration and Tuning of the Biaxial Shaking Table and the

Associated Systems

The main dynamic characteristics of the system are:

• The maximum tested specimen n ass is 40.000 kg.• The maximum tested specimen size 5m x 5m x 9m.• The maximal horizontal stroke is ± 125 mm,

while the maximal vertical stroke is ± 60 mm.• The maximal horizontal acceleration is ± 20 m/s2 {± 2g),

while the maximal vertical acceleration is ± 10 m/s2 (± lg).

The programming and control of the shaking table is provided by the performances of theelectro-hydraulic equipment and the analog the electronic system realized as five-degreethree-variable (displacement velocity, acceleration) control system with displacement asmain command signal in the horizontal and (or) vertical direction. The whole equipment isproduced by MTS - Systems Corporation, Minneapolis, Minnesota, USA.

The laboratory processes are controlled by the processing control system based on VAX-LABmodel 4000-200 computer system with Open VMS Operating System and special LaboratoryInput/Output subroutines. A special application software is developed (by the Institutes' staff)for seismic signals pre-processing, ON-LINE Control and Data Acquisition and ExperimentalData Processing. The full configuration of the computer system provides simultaneousprogramming of 8 analog output cortrol signals and acquisition of up to 64 analog inputsignals. The whole equipment is produced by Digital Equipment Corporation, USA.

The functional block diagram of the main components of the Biaxial Shaking Table ispresented at Figure 3.

The diagrams of the dynamic (amplitude/frequency) characteristics of the Biaxial ShakingTable are presented at Figure 4.

The functional block diagram of the Processing Control System VAX-LAB is presented atFigure 5.

page 7/20


Seismic Testing of Relays Used on NPP "Kozioduy", Unit 5

Function

Generator

Magnetic Tape

Recorder

Random Noise

Generator

PROCESS

CONTROL

COMPUTERSYSTEM

modelVAXLAB

4000-200

Open VMS

ProgrammableReal Time Clock

Analog OUT

D/AC^8 channels

Analog INP

A/DC<=

64 channels

J

1

=

SHAKING TABLECONTROL CONSOLE

=> Input Section

Program Selector D

« ANALOG <*CONTROL SYSTEM I)

J] Output Section

Read-out Selector =J>

<=> Control Section for <=>Hydraulic Power Supply

Uft SIGNAL =>

CONDITIONING SYSTEM

TEST SPECIMENU ft instrumented withinternal and external

electromechanical transducers

BIAXIALSHAKING TABLETHREE-VARIABLE

(ACC, VEL, DIS)CONTROL

SERVO-VALVE DRIVEN

ELECTRO-HYDRAULIC

<=> ACTUATORS o

<=> HYDRAULIC ftPOWER SUPPLY

Digital

Spectrum

Analyzer

Four

Channel

Oscilloscope

Digital

Voltmeter

Figure 3. Functional Block Diagram of the Biaxial Shaking Table

page 8/20



>-Q

co

c

ECO

Figure 4. Amplitude/Frequency Characteristicsof the Biaxial Shaking Table

page 9/20


Seismic Testing of Relays Used on NPP "Kozloduy". Unit 5

MagneticDisk#l

360 Mbytes

MagneticDisk # 1

360 Mbytes

TapeStreamer

1 Gbytes

VideoTerminals

GraphicTerminal

Local PCnetwork

Universitynetwork

OtherDevices

COMPUTERSYSTEM

VAXLAB

model 4000-200

OperatingSystem

OPEN VMS

Utilities

Real Time

Subroutine(Drivers)

Signal ProcessingSubroutines

ComputerGraphics

ApplicationSoftware

ProgrammableReal Time Clock

1L D/AC subsystem

8 analogoutput channelsDAC1 chl - ch2

DAC2 ch3 - ch4

DAC3ch5-ch6DAC4 ch7 - ch8

uTo the

Shaking TableControl System

A/DC subsystem64 analog

input channels

A/DC1 ch01-ch32A/DC2 ch33-ch64

ftFrom the

Transducer

Conditioning

System

Figure 5. Functional Block Diagram of the Computer System forProcessing Control, Data Acquisition and Data Processing

6. PROGRAMMING AND CONTROL OF THE SHAKING TABLE

The programmed movement of the shaking table is provided by the processes controlcomputer system and the analog control system facilities.

page 10/20



The computer system is used for ON-LINE generation of seismic excitations and dataacquisition, however the analog control system performs all the other functions related to thecontrolled processes including adjustment of the intensity of the dynamic excitations.

The electro-hydraulic system and analog control system facilities provide stable and accuratecontrol of processes with displacement time history as main command signal.

For that reason, it is necessary to perform numerical calculation of all the three signals(acceleration, velocity and displacements) representing the kinematics of the shaking tablemovement.

Programming of the movement intensity is provided by an accurate adjustments of thedisplacement amplitudes as ratio of the shaking table full stroke in horizontal and verticaldirections.

7. DATA ACQUISITION AND ON-LINE MONITORINGOF THE RELAY'S CONTACTS

The Data Acquisition System was considered to provide recording of the following types ofsignals:

• shaking table acceleration and displacement in horizontal and vertical direction,• stability of relay's functions and contacts, when the relay's contacts have to be

OPENED• stability of relay's functions and contacts, when the relay's contacts have to be

CLOSED

Following these statements, the data acquisition system was formed by up to 34 channels,

• 2 channels were used for recording of the shaking table acceleration,• 2 channels were used for recording of the shaking table displacement,• 15 channels were used for monitoring of the withstanding and functional stability of

the normally OPENED relay's contacts• 15 channels were used for monitoring of the withstanding and functional stability of

the normally CLOSED relay's contacts

The ON-LINE monitoring of the relay's contacts was provided by forming of up to 30auxiliary circuits, (See Figure 6), each formed as serial connection of the common DC powersupply, Resistor of about 200 Ohms resistance and pair of the monitored contacts. Thevoltage presented at the relay's contacts was recorded by the Data Acquisition System. If thecontacts are OPENED, the NON-ZERO voltage signal will be recorded, if the contacts areCLOSED, the ZERO voltage signal will be recorded.

The review of the acquired signals, representing the data acquisition system schedule ispresented in the Table 2.

A separate module was designed and produced for manual simulation of events for changingof the relay's contacts status, from OPEN to CLOSED and vice-versa.

page 11/20



Table 2. Schedule of the Acquired Signals During the Seismic Testing

ChannelNumber

010203040506070809101112

131415161718

192021222324

252627282930

313233343536

Description

Shaking table - horizontal displacementShaking table - horizontal accelerationShaking table - vertical displacementShaking table - vertical accelerationShaking table - horizontal accelerationShaking table - vertical acceleration

Relay type PEL - 8 (tested specimen number 1)

Relay type PII - 8 (tested specimen number 1)



Relay type PII - 8 (tested specimen number 3)Relay type PIT - 8 (tested specimen number 3)


Relay type PII - 23 (tested specimen number 1)Relay type PIT - 23 (tested specimen number 2)


Relay type PII - 23 (tested specimen number 3)Relay type PEL - 23 (tested specimen number 3)

Relay type PT - 40 (tested specimen number 1)Relay type PT - 40 (tested specimen number 1)Relay type PT - 40 (tested specimen number 2)Relay type PT - 40 (tested specimen number 2)

Relay type PT - 40 (tested specimen number 3)Relay type PT - 40 (tested specimen number 3)


Relay type PII - 252 (tested specimen number 1)Relay type PII - 252 (tested specimen number 2)Relay type PEL - 252 (tested specimen number 2)

Relay type PEI - 252 (tested specimen number 3)

Relay type PEI - 252 (tested specimen number 3)

Relay type P M - 305 (tested specimen number 1)

Relay type P M - 305 (tested specimen number 1)Relay type PM - 305 (tested specimen number 2)Relay type P M - 305 (tested specimen number 2)

Relay type PM - 305 (tested specimen number 3)

Relay type PM - 305 (tested specimen number 3)

ContactsNumber

22-186-2

22-186-2

22-186-2

4-32-14-32-14-32-1

7-311-97-3

11-97-3

11-92 - 16 - 52 - 16 - 52 - 16 - 5

3 - 14 - 13 - 14 - 13 - 14 - 1

Note -1

new

new

used

used

new

new

new

new

used

usednewnew

new

newused

usednew

new

new

new

usedused

new

new

new

new

usedusednew

new

Note -2

open contacts

closed contacts

open contacts

closed contacts

open contacts

closed contacts

open contacts

closed contacts

open contacts

closed contacts

open contacts

closed contacts

open contacts

closed contacts

open contacts

closed contacts

open contacts

closed contacts

open contacts

closed contacts

open contacts

closed contacts

open contacts

closed contacts

open contacts

closed contacts

open contacts

closed contacts

open contacts

closed contacts

Note: Channels 5 and 6 are used in a several test as external control only

page 12/20


Seismic resting of Relays Used on NPP "Kozlodiry", Unit 5

The presented concept for simulation and ON-LINE monitoring of the functionalperformances of the tested relays provides full automatization of this process and eliminatessome problems related to the synchronization of switching (ON-OFF) operation and eventualsubjective errors during partial monitoring and testing of the relay's functioning capabilitiesand seismic withstand capacity.

R = 200 / \

= 10 \;H;

o .

RelayContacts

{

+ Si;-;

• ~ c

AccuiF. i:; ioSys:e-.

- Sj.;:

Figure 6. Auxiliary circuit for ON-LINE monitoring of the relay's contacts

7. EXPERIMENTAL PROCEDURE

According to the regulatory standards and guidelines and the defined testing program, thesame testing procedure was performed twice, first in Longitudinal & Vertical Direction andafter in Transversal & Vertical Direction. As the longitudinal direction of the relays,conventionally is named the direction normal to the mounting surface.

Several tests were performed with the intensity about 10% to 20% of the considered nominalintensity with intention to check the functioning of the whole (testing and tested) equipmentand to define dynamic parameters for proper and accurate programming of the shaking table.

As nominal intensity of the seismic excitations (Peak Acceleration) is considered the maximalvalue (about 0.25g = 2500 mm/s2) of ZPA (Zero Period Acceleration) of the selected SSEspectra for 5% damping of critical.

In each direction (L&V and T & V), the tests with peak acceleration of 0.5»ZPA,1.0»ZPA, 1.5»ZPA, 2.0-ZPA and 4.0-ZPA are performed with "SRS" time history andthe tests with peak acceleration of 0*5»ZPA, 1.0»ZPA, and 1.5«ZPA are performed with"ENV" time history.In each direction (L&V and T & V), the same tests were performed once with horizontaland vertical signals in phase, and after with horizontal and vertical signals in oppositephase.

On Figure 7, the shaking table acceleration and displacement signals with "SRS" excitationare presented, while on the Figure 8, the shaking table acceleration and displacement signalswith "ENV" excitation are presented.

On Figure 9, the example of the ON-LINE monitoring records of the relay's contacts signalsare presented, for seismic excitation "SRS" with intensity about 4.0»ZPA or lg=9810 mm/s2

page 13/20



while on Figure 10, the example of the ON-LINE monitoring records of the relay's contactssignals are presented, for seismic excitation "ENV" with intensity about 1.5«ZPA or 0.4g =4000 mm/s2.

8. CONCLUSIONS AND RECOMMENDATIONS

The seismic testing of five types of relays, used at NPP "Kozloduy", Unit 5, were performedwith a several intentions.

• Cover the Institute's obligations in the framework of the IAEA Coordinated ResearchProgram: "Benchmarks Study for Seismic Analysis and Testing of WWER NuclearPower Plants", Project: Seismic Functional Qualification of Electrical and MechanicalEquipment Based on Shaking Table Testing".

• Demonstrate the proposed methodology and the existing performances of the Institute'sDynamic Testing Laboratory.

• Check the functioning capabilities and seismic withstanding of the selected types ofrelays.

The experimental investigations of the relays were planed and realized in accordance with theIEEE standards and guidelines.

In accordance with the regulatory requirements and recommendations, and the User (NPP"Kozloduy") agreements, the seismic testing were considered as prove tests.

The analyses of the ON-LINE monitoring records shows a permanent functioning of therelays for seismic excitations performed with the Standard Response Spectra, prescribed byIEEE Standard 501 "Seismic Testing of Relays", applied with the intensity of 4.0-ZPA,equivalent to lg = 9810 mm/s2 and for seismic excitations performed with the EnvelopeSpectra (where Standard Response Spectra and Local seismic conditions are incorporated)applied with the intensity of 1.5«ZPA equivalent to 0.4 g = 4000 mm/s2.

Final decision and acceptance of the results, could be realized after the official definition ofthe acceptance criteria.

BIBLIOGRAPHY

Selected Regulatory Papers (Standards and Guidelines)

1. IEEE Standard 501 - 1978 (C 37.98)Seismic Testing of RelaysThe Institute of Electrical and Electronics Engineers, 1978

page 14/20



2. Regulatory Guide L100Seismic Qualification of Electric and Mechanical Equipmentfor Nuclear Power PlantsU.S. Nuclear Regulatory Commission, 1988

3. IEEE Standard 344 - 1987, (IEEE Standard 344 -1975),IEEE Recommended Practice for Seismic Qualification of Class IE Equipmentfor Nuclear Power Generating StationsThe Institute of Electrical and Electronics Engineers, 1987, (1975)

4. IEEE Standard 323 - 1983IEEE Standard for Qualifying Class IE Equipmentfor Nuclear Power Generating StationsThe Institute of Electrical and Electronics Engineers, 1983

5. IEEE Standard 420 - 1982IEEE Standard for the Design and Qualification of Class IEControl Boards, Panels and Racks used inNuclear Power Generating StationsThe Institute of Electrical and Electronics Engineers, 1983

6. IEC-780-1984Qualification of Electrical Items of the Safety Systemfor Nuclear Power Generating StationsInternational Electrotechnical Commission (IEC), 1984

7. IEC -9S0-1991Recommended Practices for Seismic Qualification of Electrical Equipmentof the Safety System for Nuclear Power Generating StationsInternational Electrotechnical Commission (IEC), 1991

8. IEC 68 - 3 - 3 -1991-02 International Standard, Part 3 GuidanceSeismic test methods for equipment

International Electrotechnical Commission (IEC), 1991

Other References

1. Report RI/D - 33/94Calculation of the Floor Response Spectra for the Reactor Section ofNPP "Kozloduy" Units 5 and 6 ( in Bulgarian language)Risk Engineering OOD, Sofia, Bulgaria -1994

2. Report RI/D - 46/95Calculation of the Structure's Response of NPP "Kozloduy" Units 1-6from Local Earthquake Seismic Excitations (in Bulgarian language)

Risk Engineering OOD, Sofia, Bulgaria - 1995

page 15/20


Seismic Testing of Reiays Used on NPP "Kozloduy", Unit 5

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page 16/20



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page 17/20



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page 18/20


Seismic Testing of Relays Used on NPP "Kozioduy", Unit 5

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Figure 10. ON-LINE Monitoring of Relay's Functioning Capabilities"ENV" excitation, Peak Acceleration corresponding to 1.5»ZPA

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Seismic Testing of Relays Used on NPP "Kozloduy", Unit

.-305 RP-252

w P - P,

HI - i(J RP-23

S 3M

Figure 11. Scheme and View of the Relays and Mounting Supportsmounted on the Biaxial Shaking Table

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title: seismic testing of relays used on npp kozloduy

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