c7 5-16-2010 rev-01 commented trips,alarms,events,holds

GE Energy Typical D11 Alarms Oct 2009

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Line Item Section Description

32 Trips73 Main Steam Valve Testing111 Bearing Temperature Monitor165 TSI Monitor226 Steam Temperature Monitoring267 Emergency Trip System299 Lube Oil System Monitoring336 Hydraulic System Monitoring350 Turning Gear

360Steam Seal System Monitoring w/Exhaust Pressure

Protection380 Aux Steam Valves * Items must be checked, they originate from the latest D11 Database

432 Hydrogen490 Generator Excitation & Protection541 Automatic Turbine Start604 Miscellaneous Control Elements673 MKVI Control Cabinet688 MKVI Control Diagnostic Alarms

MKVI Software

Signal NameTrip or Alarm Text Comment

* Master Protective Trip

* Aux Trip 1 L4TX1 Any Aux Trip #1




NOTE: This document is Proprietary & Confidential and should not be copied, or in any way transferred to other organizations without the written permission of GE. This

Typical Code C7 Steam Turbine

*** WARNING ***

This document provided for training only.

Consult unit "As-Built" MKVI code when diagnosing site

specific problems

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* Primary Overspeed Latch Trip L12HPrimary OS setpoint is set by the constant KTNHOS

(D11 = 110~112 % of rated speed)

* VPRO HP Overspeed Trip L12H_PEmergency OS is set by the constant KTNH_EOS_RPM

(D11 = 110.5~112.5% of rated speed)

* Auxiliary Trip 1

* S1\L63QLT LUBE OIL PRESSURE LOW TRIP

< 6 psig as measured at unit turbine deck centerlline.

PS-270B, C, D (opens-to-trip on decreasing 6 psig + / - 1 psig) OR PT-270A~C

* S1\L63HQLT HYDRAULIC FLUID PRESSURE LOW TRIPFRS < 1650 psig for a 2400 psig system or 1100 psig for a 1600 psig system. MKVI

looks to PS-281D, E, & F OR PT-281-1,2,3 (median select)

* S1\L26HPEXT HP EXHAUST TEMP HIGH TRIPTrip IF median of TE-211G,H,J exceeds 830F for 15 minutes

OR IF median exceeds 880F.

* S1\L26L1SLST L-1 STAGE STEAM TEMP TRIP Trip IF median of TE-213G,H,J exceeds 500F.

* S1\L26EXHT HIGH EXHAUST TEMPERATURE TRIP Trip IF median of TE-210A,B,C exceeds 225F.

*

S1\L63EVT EXHAUST VACUUM TRIP

Unit with VAN: Trip setpoint variable as a function of LP steam flow; PT-213A,B,C

AND exhaust pressure as per PT-213A,B,C. Refer to the unit specific GEK for a

curve.

Protection arms at speed > 300 rpm.

non-Van; Trip setpoint is fixed. Control acts on the median of PT-213A, B, C.

Three (3) conditions must exist for a Unit Trip to initiate;

(1) Speed must equal or exceed 300 rpm

(2) Alarm level of 5.0inHgA must exist

(3) Trip level of 7.5inHgA must exist

* Off-Line ETD Test Trip L83ETDOF_TRP

Normal end of an "Off-Line ETD Test"

Off-Line ETD tests for each ETD in a 2-ETD system OR for each pair in a 2-out-

3 system should be conducted before each Turbine start

*

Shutdown Trip L1SDTRIP

Normal end of an "Auto-Stop" rountine.

Once instigated an "Auto-Stop" routine unloads the unit at the rate of 20% per minute

AND at the end of 5 minutes issues a unit trip.

The operator can manually issue an "Auto Stop" command at the HMI "Speed

Control" OR loss of Generator Protection can automatically issue an Auto-Stop if

programmed.

* Auxiliary Trip 2

*

HP - Zero Speed Trip L14HR

Unit trip is initiates when 2-out-of-3 primary speed pickups sense speed equal or less

than 0.06% of rated

L14HR = 1 (L14HR "picked-up")

Trip "drops-out" with 2-out-of-3 primary speed pickups sense speed equal or greater

than 0.097% of rated (L14HR "dropped-out").

* TURBINE TRIP ON BYPASS ERROR

Not used on D11's.

Unit is above 75% rated speed and control logic has failed to select either Bypass

(Reverse) or Forward Flow. Logic investigation is needed.

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*

HP - Turbine Speed Trip L14HP

L14HP is true when Primary Speed Probes sense unit speed equals or exceeds

15% of rated. L14HP reverts to false when speed equals or drops below 10% of

rated. Background toggles to RED when a TRIP condition exists. Primary speed

probes ST-201A, B, C

* "AND" Logicals L14HP AND L14H_ZE must both be "true" or "picked-up" for a Unit

TRIP to initiate.

* VPRO HP Zero Speed L14H_ZE

L14H_ZE is true if 2-out-of-3 Emergency Speed Probes have no speed signal.

Background toggles to RED when a TRIP condition exists. Emergency speed

probes ST-202A, B, C

* Auxiliary Trip 3

* HP Accel/Decel Rate Too High L12H_ACC_DEC

Failure of Emergency Overspeed probes AND/OR MKVI VPRO components.

Undertake a RCA investigation and resolve before any re-start.

(speed probes ST-202A, B, C)

*

Manual Emerg. Trip Circuit Activated L5E

Trip via a Manually activated pushbutton.

Manual trip pushbuttons wire in series fashion directly to MKVI. Open-to-Trip.

Typically they can be found at the ST front standard, MKVI Panel front, and adjacent

to the operators control room monitors.

*

Process Trip From BOP DCS L5E_DCS

Trip initiated from Plant Distributed Control System.

These trips are beyond the scope of GE Steam Turbine or Generator Engineering

and so specified by the owner/end user. Operators should investigate and develop a

complete list of all possible situations which can produce an L5E_DCS trip.

Typically a closed contact which is open to Trip. Site specific situations should be

verified.

*

Unit Trip Via L86G1A Lockout Relay L86TGT

Unit Trip initiated via Generator Protection at GP2100.

GE can supply protection relay hardware AND engineer relay settings, OR both

hardware and settings may be supplied by others. Often, realy protection hardware is

purchased from GE with relay settings engineered by others. Units vary widely in this

regard.

Operators should question which specific relays are used, and so which specific

relays initiate a trip.

A list should be developed. See GEK-75512 for a discussion with regards "Generator

Protection".

In any case the specific cause of the trip should be fully understood before any

reset is permitted.

* GSU Transformer Lockout Trip L86TT Unit Trip initiated via Generator Protection at GP2100.

* Gen Breaker Failure Lockout Relay Trip L86BFT Unit Trip initiated via Generator Protection at GP2100.

* Unit Trip Via L86G1B Lockout Relay L86G1B Unit Trip initiated via Generator Protection at GP2100.

* Speed Deviation Above Limit - Trip L14TNH_DEV

Primary & Emergency Speed signals deviate by more than 5%.

Fully investigate both Primary and Emegency Speed channels and produce an Root

Cause Analysis before any re-start

* Auxiliary Trip 4

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* Axial Position Trip L39AXT

2 out of 3 axial position probes located at the thrust bearing see the rotor beyond

safe operating limits for more than 1 second.

Position problem could be on the Active or Inactive side of the thrust

* Axial Probes Failed Trip L39AXFT 2-out-of-3 probes loacted at the thrust bearing fail for longer than 1 second.

* Axial Probes Failed or Position Trip L39APFTA Trip will initiate if one probe fails and a second probe indicates an actual trip

condition exists; thrust bearing.

* Differentail Expansion Trip 1 L39DE1TA Short or Long Differentail Trip situation has existed for more than 10 seconds and

the unit will be tripped

*

Vibration Trip L39VT

Any one or more of the 12 channels

(X & Y channels at Brg's #1, #2, #3, #4, #5, #6)

indicates shaft radial vibration in excess of 9 mils pk-pk

(shaft motion relative to bearing in one revolution)

Note; all channels are monitored for fault conditions. Channels WILL NOT initiate a

Unit Trip if in "fault". An Alarm will initiate alerting to the operator that a channel is in

"fault".

* Rotor Expansion Trip L39RE1T Rotor indicates beyond safe limits; Long or Short for more than 10 seconds.

* *

Main Steam Valve Testing

MSCV & CRV (IV~RSV) Valve Testing

S1\L30MSV1_F MSV #1 FAILURE - CLOSING TIME TOO LONG

SV Trip Closing Rate Check SV must be closed 1 second after a Trip

command is issued. Valve failed to close quickly, Investigate. This test is

separate from the daily on-line valve tests.S1\L30MSV2_F MSV #2 FAILURE - CLOSING TIME TOO LONG same as above

S1\L30CV1TF CONTROL VALVE #1 TEST FAILED

Associated with a recommended "Daily" On-line test. Following a test

start, the CV or IV has 15 seconds to reach full closed position. CV or IV

failed to close in 15 seconds. Investigation required.S1\L30CV2TF CONTROL VALVE #2 TEST FAILED same as above

S1\L30CV1QC_F CV1 QUICK CLOSE SOLENOID FAILURE

Associated with a recommended "Daily" On-line test. Once the FASV

(Fast Acting Solenoid Valve) is activated the CV or IV must be closed within

0.2 Seconds. Valve did not close fast enough following activation of the

FASV. Investigation required.S1\L30CV2QC_F CV2 QUICK CLOSE SOLENOID FAILURE same as above

S1\L30CV1TM CV #1 MAINTENANCE REQUIRED

Associated with a recommended "Daily" On-line test. CV or IV must

remain closed while the MSV test is in progess. The CV or IV has re-

opened prematurely. Investigation is required.S1\L30CV2TM CV#2 MAINTENANCE REQUIRED same as above

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S1\L30MSV1DT_F MSV #1 DUMP TEST SOLENOID FAILURE

Associated with a recommended "Daily" On-line test. Once the FASV

(Fast Acting Solenoid Valve) is activated the SV should be closed within 0.2

Seconds. Timing Problem, valve did not close fast enough following

activation of the FASV. Investigation required.S1\L30MSV2DT_F MSV #2 DUMP TEST SOLENOID FAILURE same as above

S1\L30MSV1TF MSV #1 TEST FAILED TO CLOSE IN TIME

Associated with a recommended "Daily" On-line test. MSV or RSV

Test starts when CV or IV indicates it's at closed position, the MSV or RSV

has 10 seconds to reach full closed position. MSV or RSV failed to close in

10 seconds. Investigation required.S1\L30MSV2TF MSV #2 TEST FAILED TO CLOSE IN TIME same as above

Admission or LP Stop Valve

S1\L30ASV1_F ASV #1 FAILED TO TRIP IN TIME

SV Trip Closing Rate Check SV must be closed 1 second after a Trip

command is issued. Valve failed to close quickly, Investigate. This test is

separate from the daily on-line valve tests.

S1\L30ASV1L ASV #1 LIMIT SWITCH TROUBLESV open & closed limit switches indicate that the ASV is both "openned" &

"closed" at the same time. Investigation is required.

S1\L30ASV1TF ADMISSION STOP VALVE #1 TEST FAILED

Associated with a recommended "Daily" On-line test. Following a test

start, the ASV has 11 seconds to reach full closed position. ASV failed to

close in 11 seconds. Investigation required.

Bearing Temperature Monitor

Journal Bearing Drain Oil and Bearing Metal

S1\L26G1DA BEARING #1 OIL DRAIN TEMPERATURE HIGH >175F (79.5C)S1\L26G2DA BEARING #2 OIL DRAIN TEMPERATURE HIGH >175F (79.5C)S1\L26G3DA BEARING #3 OIL DRAIN TEMPERATURE HIGH >175F (79.5C)S1\L26G4DA BEARING #4 OIL DRAIN TEMPERATURE HIGH >175F (79.5C)S1\L26G5DA BEARING #5 OIL DRAIN TEMPERATURE HIGH >175F (79.5C)S1\L26G6DA BEARING #6 OIL DRAIN TEMPERATURE HIGH >175F (79.5C)

S1\L26G1MA BEARING #1 METAL TEMPERATURE HIGH

> 240F (115.5C) Investigate immediately.

Trend and prepare to reduce load.

See GEK-92569 III Op's RecommendationsS1\L26G2MA BEARING #2 METAL TEMPERATURE HIGH see aboveS1\L26G3MA BEARING #3 METAL TEMPERATURE HIGH see above

S1\L26G4MA BEARING #4 METAL TEMPERATURE HIGH> 225F (107C) Investigate immediately.

Trend and prepare to reduce load. See GEK-63390S1\L26G5MA BEARING #5 METAL TEMPERATURE HIGH see aboveS1\L26G6MA BEARING #6 METAL TEMPERATURE HIGH see above

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S1\L26G1MT BEARING #1 METAL TEMPERATURE HIGH HIGH

> 260F (126.7C) Reduce Load Immediately,

until such time as temperatures are normal. Trend for further investigation.

See GEK-92569 III Op's RecommendationsS1\L26G2MT BEARING #2 METAL TEMPERATURE HIGH HIGH see aboveS1\L26G3MT BEARING #3 METAL TEMPERATURE HIGH HIGH see above

S1\L26G4MT BEARING #4 METAL TEMPERATURE HIGH HIGH

> 250F (121 C) Reduce Load Immediately

until such time as temepratures are normal. Trend for further investigation.

See GEK-63390S1\L26G5MT BEARING #5 METAL TEMPERATURE HIGH HIGH 250F (121 C)S1\L26G6MT BEARING #6 METAL TEMPERATURE HIGH HIGH 250F (121 C)

Journal Bearing Spike Monitor

S1\L26JBS1A JOURNAL BEARING #1 TEMP HIGH PRE-ALARMPre-Alarm = 12F (6.6C) spike over a 1 minute sample time

(normalized for LO temperature over the sample period) S1\L26JBS2A JOURNAL BEARING #2 TEMP HIGH PRE-ALARM see aboveS1\L26JBS3A JOURNAL BEARING #3 TEMP HIGH PRE-ALARM see aboveS1\L26JBS4A JOURNAL BEARING #4 TEMP HIGH PRE-ALARM see aboveS1\L26JBS5A JOURNAL BEARING #5 TEMP HIGH PRE-ALARM see aboveS1\L26JBS6A JOURNAL BEARING #6 TEMP HIGH PRE-ALARM see above

S1\L26JBS1HA JOURNAL BEARING #1 TEMP HIGH ALARM

HI Alarm = 15F (8.3C) spike over a 1 minute sample period.

Investigation warranted before next start-up. Possible wiped babbit. See

GEK-72345 Appendix A. Alarm temperature is normalized for any

changes in LO over the duration of the sample.S1\L26JBS2HA JOURNAL BEARING #2 TEMP HIGH ALARM see aboveS1\L26JBS3HA JOURNAL BEARING #3 TEMP HIGH ALARM see aboveS1\L26JBS4HA JOURNAL BEARING #4 TEMP HIGH ALARM see aboveS1\L26JBS5HA JOURNAL BEARING #5 TEMP HIGH ALARM see aboveS1\L26JBS6HA JOURNAL BEARING #6 TEMP HIGH ALARM see above

Thrust Bearing

Notes (1) Code C7's use either 2, or 4 Metal TE's per side. In the 2 per

side configuration TE's are placed Upper & Lower. In the 4 per

configuration we use Upper, Lower, Left & Right.

(2) Code C7 ..."Active" = TE (Turbine End) ... "Inactive" = GE (Generator

End).

(3) Manage temperatures as per GEK-100454 "IV. Operation"Direct Reading TE's

S1\L26TAMA THRUST BEARING ACTIVE METAL TEMP HIGHHighest TE on this side > 225F (107C)

Trend and monitor closely. Prepare to reduce load.S1\L26TIMA THRUST BEARING INACTIVE METAL TEMP HIGH see above

S1\L26TAMT THRUST BRG ACTIVE METAL TEMP HIGH HIGH

Highest TE on this side > 250F (121C).

Reduce load immediately until such time as metal temperature drops

to normal. Trend for later analysis.S1\L26TIMT THRUST BRG INACTIVE METAL TEMP HIGH HIGH see above

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Thrust Bearing Monitor

Notes to TBMON "Differential" function...

Alarms indicates a differential temperature problem.

Individual TC temperatures, on a given side, inactive or active, are not

uniform and so have a differential. Likely this indicates misalignment

between the thrust runner or thrust collar and the bearing.

S1\L26TBFDA TB MONITOR-FRONT DIFF TEMP PRE-ALARM Delta between Highest & Lowest TC > 28F (15.5C).S1\L26TBRDA TB MONITOR-REAR DIFF TEMP PRE-ALARM see above

S1\L26TBFDHA TB MONITOR-FRONT DIFF TEMP ALARM

Delta between Highest & Lowest TC > 30F (16.6C).

Reduce load immediately until such time as metal temperature drops

to normal. Trend for later analysis.S1\L26TBRDHA TB MONITOR-REAR DIFF TEMP ALARM see above

C7's DO NOT USE the TBMON "Norm-Max" function...

"NORM-MAX" Alarms... "TBMON" function looks at Brg Metal AND Lube

Oil Cooler outlet temperatures. Metal temps are corrected around 115F.

See GEK-46382F section IIIE.S1\L26TBFA TB MONITOR-NORM MAX FRONT TEMP PRE-ALARM see aboveS1\L26TBRA TB MONITOR-NORM MAX REAR TEMP PRE-ALARM see aboveS1\L26TBFHA TB MONITOR-NORM MAX FRONT TEMP ALARM see aboveS1\L26TBRHA TB MONITOR-NORM MAX REAR TEMP ALARM see above

Drain OilS1\L26TIDA INACTIVE THRUST BEARING OIL TEMP HIGH >175F (79.5C)S1\L26TADA ACTIVE THRUST BEARING OIL TEMP HIGH >175F (79.5C)

TSI Monitor

Thrust Position

Zero benchmark position for ST Rotors = center of the thrust bearing

clearance. Thrust clearance will be verified at site via a "bump-test" after

the bearing is assembled.

Design thrust clearance for a Code C7 is typically 14~16 mils; this will

need to be verified on a site specific basis.S1\L30AXA AXIAL POSITION HIGH - ACTIVE …+30 mils…S1\L30AXAT AXIAL POSITION TRIP - ACTIVE …+35 mils…S1\L30AXI AXIAL POSITION HIGH - INACTIVE ...-30 mils…S1\L30AXIT AXIAL POSITION TRIP - INACTIVE ...-35 mils…

DXD between Journal Bearings #2 & #3(setpoints in mils apply to 270T776, other units may vary

ref: Control Spec ML-HAU 365A4396)

S1\L30DE1LA DIFFERENTIAL EXPANSION #1 LONG

"Long" indicates rotor movement away from the thrust bearing.

Plus (+) is used to denote a Rotor Long situation

…+ 228 mils...

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A B C D

S1\L30DE1LT DIFFERENTIAL EXPANSION #1 LONG TRIP …+258 mils… ( a 10 second time delay is in use)

S1\L30DE1SA DIFFERENTIAL EXPANSION #1 SHORT

"Short" indicates rotor movement towards the thrust bearing.

Minus (-) is used to denote a Short Rotor situation

…-136 mils... S1\L30DE1ST DIFFERENTIAL EXPANSION #1 SHORT TRIP …-166 mils… ( a 10 second time delay is in use)

Eccentricity

S1\L30ECH ECCENTRICITY HIGH

***High Eccentricity is a leading cause of failed starts***.

Operators should closely monitor their unit specific situation and restart with

low values of eccentricity.

In the past C7's set the alarm setpoint at; "last best value" plus 2 mils.

Presently all MKVI are shipped with the setpoint at 2 mils. Unit specific

setpoints are adjusted on a case by case basis with assistance from GE.

This is done in attempt to reduce failed starts. Ref. to Basic SALI GEK-

100475 50Hz for further advise with regards Turning Gear operation.

C7's monitor eccentricity at the front standard.

RXD between Journal Bearings #4 & #5

S1\L30RE1LA ROTOR EXPANSION #1 LONG

"Long" indicates rotor movement away from the thrust bearing.

Plus (+) is used to denote a Rotor Long situation

…+404 mils... S1\L30RE1LT ROTOR EXPANSION #1 LONG TRIP …+434 mils… ( a 10 second time delay is in use)

S1\L30RE1SA ROTOR EXPANSION #1 SHORT

"Short" indicates rotor movement towards the thrust bearing.

Minus (-) is used to denote a Short Rotor situation

…-178 mils... S1\L30RE1ST ROTOR EXPANSION #1 SHORT TRIP …-208 mils… ( a 10 second time delay is in use)

Radial Vibration

S1\L39VA1A HIGH VIBRATION - BEARING #1> 6 mils Pk-Pk

Shaft movement relative to bearing in one revolution.S1\L39VA2A HIGH VIBRATION - BEARING #2 see aboveS1\L39VA3A HIGH VIBRATION - BEARING #3 see aboveS1\L39VA4A HIGH VIBRATION - BEARING #4 see aboveS1\L39VA5A HIGH VIBRATION - BEARING #5 see aboveS1\L39VA6A HIGH VIBRATION - BEARING #6 see aboveS1\L39VT1A HIGH VIBRATION TRIP - BEARING #1 see aboveS1\L39VT2A HIGH VIBRATION TRIP - BEARING #2 see aboveS1\L39VT3A HIGH VIBRATION TRIP - BEARING #3 see aboveS1\L39VT4A HIGH VIBRATION TRIP - BEARING #4 see aboveS1\L39VT5A HIGH VIBRATION TRIP - BEARING #5 see aboveS1\L39VT6A HIGH VIBRATION TRIP - BEARING #6 see above

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Prox. Probe Faults

S1\L39VF1 AXIAL POSITION PROBE #1 FAILURE See Logic on Trip Check Database. Investigate as soon as time permits

S1\L39VF2 AXIAL POSITION PROBE #2 FAILURE see above S1\L39VF3 AXIAL POSITION PROBE #3 FAILURE see above S1\L39AXFT AXIAL PROBES FAILED - TRIP

S1\L39VF1X VIBRATION TRANSDUCER FAULT 1X

Faulty proximitor or probe, wiring issue, loose connection between MKVI &

BNC module. Both the monitoring function (alarm) and protection

function (trip) are inhibited while this alarm is active. Investigate

immediatelyS1\L39VF1Y VIBRATION TRANSDUCER FAULT 1Y see aboveS1\L39VF2X VIBRATION TRANSDUCER FAULT 2X see aboveS1\L39VF2Y VIBRATION TRANSDUCER FAULT 2Y see aboveS1\L39VF3X VIBRATION TRANSDUCER FAULT 3X see aboveS1\L39VF3Y VIBRATION TRANSDUCER FAULT 3Y see aboveS1\L39VF4X VIBRATION TRANSDUCER FAULT 4X see aboveS1\L39VF4Y VIBRATION TRANSDUCER FAULT 4Y see aboveS1\L39VF5X VIBRATION TRANSDUCER FAULT 5X see aboveS1\L39VF5Y VIBRATION TRANSDUCER FAULT 5Y see aboveS1\L39VF6X VIBRATION TRANSDUCER FAULT 6X see aboveS1\L39VF6Y VIBRATION TRANSDUCER FAULT 6Y see above

S1\L39ECF ECCENTRICITY PROBE FAILURE

S1\L39RXD1AF RXD 1A POSITION PROBE FAILURE

S1\L39RXD1BF RXD 1B POSITION PROBE FAILURE

Steam Temperature Monitor

Low Pressure Exhaust

MONITOR.L26LPA_A LPA HIGH EXHAUST TEMPERATURE ALARM

The median of TE-210-A, B, C has exceeded 200F. The operator needs to

take immediate action as LP Exhaust Hood temperature can climb quickly.

If hood sprays are fully operational, increase vacuum, or increase steam

flow (Load) or both.MONITOR.LEXHTH_OUTEXHAUST HOOD TEMPERATURE HIGH see above

S1\L26EXHT HIGH EXHAUST TEMPERATURE TRIPThe median of TE-210-A, B, C has exceeded 225F, this is an

instantaneous Trip.MONITOR.L26LPA_T LPA HIGH EXHAUST TEMPERATURE TRIP see above

Thermocouple Faults - I&C Problems

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S1\L30TTIS INLET STEAM TC PROBLEM

TE-200-1 & 2; one or both exceed HI or LO limits OR while within limits

they exceed the max spread of 25F. MKVI works on the average of both as

long as they differ by no more than 25F and are within HI & LO limits.

NOTE: The ATS sequence must have at least one good Main Steam Inlet

TC to initiate an Auto-Start.

S1\L301SB_TCF_A 1ST STAGE BOWL TC FAILURE

TE-203A, C, or D have no input to the MKVI.

Upper TE-203A is compared to both Lowers TE-203C & D for...

"Water Detection" Alarms

Lowers TE-203C & D are averaged to produce...

"1st Stage Metal for Control Start"

S1\L30LPAS LP ADMISSION STEAM TC PROBLEM

TE-227-1 & 2; one or both exceed HI or LO limits OR while within limits

they exceed the max spread of 20F. MKVI works on the average of both as

long as they differ by no more than 20F and are within HI & LO limits.

NOTE: Monitoring only.S1\L26LPAS_SPD LP ADMISSION STEAM TEMP SPREAD EXCEEDED TE-227-1 & 2; TC exceed the max spread of 20F.

S1\L30TTEXH EXHAUST TC PROBLEMThe spread from highest to lowest exceeds 30F.

NOTE: Units TRIPS on the median of TE-210A,B,C.

Water Induction Warnings

Water induction events should be examined closely. Performance and unit

mechanical intregity are compromised. In general it's best to continue with

operation as typically the alarms are short lived, immediate shutdown is

rarely benefical. There is little the ST Control can do to prevent water

induction. The alarm serves to alert Operations personnel that plant wide

changes are needed. A root cause analysis should be conducted to

determine what plant wide corrective actions are needed. Alarm spreads

are initially set at 50F but can be adjusted upwards to as much as 100F if

investigations warrant. GEK-72286 discusses adjustment. Contact GE for

assistance if needed. Water induction is a serious problem.

S1\L30WD1S_SPD WATER DETECT STG 01 TEMP SPREAD EXCEEDED

MKVI monitors three 1st Stage Bowl Metal TE's for indications of Water.

An alarm is issued whem TE-203A Upper is 50F higher than either of the

two lower elements; TE-203C or TE-203D.

Emergency Trip System (ETD)

2-Out-Of-3 System

S1\L30ETD1_DOF HYD TRIP HEADER TRIP TIME EXCESSIVE

Off-Line Test 3~1 Problem. Emergency Trip Header failed to trip (PS-282

still closed) 750 msec after MKVI sequencing commanded a release (trip)

of ETD#1. During this test ETD #3 must first trip for the test to continue to

an ETD #1 trip.

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an ETD #2 trip.





an ETD #3 trip.

S1\L30ETD12_FA UNEXPECTED TRIP - PROBLEM W/ETD 1 OR 2

Off-Line Test 3~1 Problem. During the ETD Off-Line Test the two ETD’s

are sequentially de-energized (tripped). The OFF-Line Test 3~1 first de-

energizes ETD #3. If the Emergency Trip Header "trips” due to this action

(PS-282 opens) then a problem exists either ETD #1 or #2. They should

have prevented the hydraulic header from tripping when ETD #3 was

released. The trip following release of ETD#3 is then is an “unexpected”

result.








result.








result.

S1\L30ETD1DO_FA ETD #1 TRIP TIME EXCESSIVEON-Line ETD#1 "or" OFF-Line ETD#1~2 Test Problem. ETD #1 failed to

"trip" within 750 msec of Test start.

S1\L30ETD2DO_FA ETD #2 TRIP TIME EXCESSIVEON-Line ETD#2 "or" OFF-Line ETD#2~3 Test Problem. ETD #2 failed to

"trip" within 750 msec of Test start.

S1\L30ETD3DO_FA ETD #3 TRIP TIME EXCESSIVEON-Line ETD#3 "or" OFF-Line ETD#3~1 Test Problem. ETD #3 failed

to "trip" within 750 msec of Test start.

S1\L30ETD1PU_FA ETD #1 RESET TIME EXCESSIVEON-Line Test ETD #1 Problem. ETD #1 failed to Reset within 750 msec

when commanded


when commanded


when commanded

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Emergency Trip Supply (ETS) Header

S1\L63HQET EMERGENCY TRIP HEADER TRIPPED

"Emergency Trip Supply" header (or FSS) supplies fluid needed to "reset"

hydraulic relays located on the MCV's, MSV's and ASV.

The ETS header, (or FSS) is always in one of two possible states;

"Tripped" or "Reset".

Switch PS-282 (NC) monitors the "ETS" header (FSS Fluid).

PS-282 indicates ETS (FSS) Tripped on decreasing 200 psig

PS-282 indicates ETS (FSS) Reset on increasing 300 psig

MCV's, MSV's and the ASV should immediately close on a Trip.

In a 3 ETD system, any 2 energized & healthy ETD's will allow the ETS

(FSS) header to pressurize.

Lube Oil System Monitoring

Vapor Extractor

S1\L30QVLA LUBE OIL TANK LOW VACUUM

tank vacuum via PS-271G < 3.5" H2OVac

( 8.78 mBarVac ~ 1004.5 mBarAbs )

with either AC Bearing Pump or EBOP running.

PS-271G should clear the alarm when > 4.0" H2OVac ( 9.9 mBarVac ).

Lube Oil Pumps

S1\L30Q_T_F AC LUBE OIL PUMP TEST FAILED

15 seconds since a start was requested via the HMI test PB and still no

Pump Start. This requires timely investigation. The design intent is that

both AC Lube Oil Pumps be healthy at all times.

Lube Oil Coolers

LO Temperatures are discussed in GEK-72345

(1) Turning Gear 80~90 F ( 26.6 ~ 32.2 C )

(2) Normal Ops is 110~120F ( 43~49 C )

(3) Typical Brg rise 25~50 F ( 14~28 C)

(4) On Master Reset (KLOTC_RESET) to 120 F ( 48.8 C )

(5) On Trip (KLOTC_TG) to 85F ( 29.4C )

S1\L30LOCO_F LO COOLER OUT TEMP TROUBLE - MAN SELECT

Median of TE-260B,J,K is outside the High & Low limits of 130F and 75F.

The MKVI will not execute in Auto.

Operator will need to use the local TI-260B as a guide an manually

adjust Lube Oil Temp.

S1\L30LOCO_INV LO COOLER OUT TC INVALID/OUT OF RANGE

Median of TE-260B,J,K is outside the High & Low limits of 130F and 75F.

The MKVI will not execute in Auto.

Operator will need to use the local TI-260B as a guide an manually

adjust Lube Oil Temp.S1\L30LOCO_SPD LUBE OIL COOLER OUTLET HI TC SPREAD TE-260B,J,K deviate by > 10F (5.5C)S1\L30LOTC_MAN LUBE OIL TEMP CONTROL IN MANUAL

S1\L26LOCOHA LUBE OIL OUTLET TEMPERATURE HIGH Median of TE-260B,J,K Lube Oil at Cooler Outlet > 130F (54.4C)S1\L26LOCOHT LUBE OIL OUTLET TEMPERATURE HIGH HIGH Median of TE-260B,J,K Lube Oil at Cooler Outlet > 140F (60C)

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FiltersS1\L63QDF1A LUBE OIL FILTER #1 DIFF PRESS HIGH PS-271A. Alarm on increasing 15 psid (reset on 11 psid)S1\L63QDF2A LUBE OIL FILTER #2 DIFF PRESS HIGH PS-271B. Alarm on increasing 15 psid (reset on 11 psid)

Bearing Pressure

S1\L63QLA LUBE OIL PRESSURE LOWPS-270A opens-to-alarm on decreasing 10 psig +/- 1 psig,

"as-measured-at-unit-centerline".

S1\L63QLT LUBE OIL PRESSURE LOW TRIP

PS-270B, C, & D open-to-alarm on decreasing 6 psig +/- 1 psig,

"as-measured-at-unit-centerline".

These three switches are voted in software,

any two can result in a Trip. Tank Level Use only on a unit specific basis

S1\L71QLA LUBE OIL LEVEL LOW

S1\L71QLLA LUBE OIL LEVEL LOW LOW

S1\L71QLT LUBE OIL LEVEL LOW TRIP

Emergency Bearing Oil Pump (EBOP)

Auto Start Logic EBOP

(1) Auto Start if AC lost to both BPM's.

(2) Auto Start on low LO pressure (PS-266A)

Manual Start via HS-266

Test Start via FY-266 OR 3-Way Vlv at PS-266A

Emergency Seal Oil Pump (ESOP)

Auto Start Logic ESOP

(1) Auto Start if AC lost to both BPM's.

(2) Auto Start on low LO pressure (PS-266B)

(3) Auto Start on low pressure to skid (PS-3404)

(4) Auto Start if low-low H2 to Seal Oil delta (PDSL-3406)

Manual Start via HS-266

Test Start via FY-266 OR 3-Way Vlv at PS-266B

S1\L72EBOP_FL_A DC PUMP MOTOR FIELD LOSS

***A very serious alarm***

Until proven otherwise it should be considered that the motor field coil is

open or grounded and the motor will not start. Situation should be

investigated and resolved immediately.

Without backup EBOP the unit should be shutdown.

S1\L72ESOP_FL_A DC (Seal Oil) PUMP MOTOR FIELD LOSS

A very serious alarm.

See above

Without backup ESOP the unit should be shutdown.

S1\L72EBOP_MF_A DC PUMP MALFUNCTION/NOT IN AUTO

***A very serious alarm***

Until proven otherwise it should be considered that the motor starter is

incapable of auto starting and so the motor will not start.

Situation should be investigated and resolved immediately.

Without a backup EBOP the unit should be shutdown.

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S1\L72ESOP_MF_A DC (Seal Oil) PUMP MALFUNCTION/NOT IN AUTO


See above

Without backup ESOP the unit should be shutdown.

S1\L72EBOP_OL_A DC PUMP MOTOR OVERLOAD

In a real emergency the EBOP & ESOP should be run to distruction if

needed.

Needs of the rotor and bearing system take precedance other the heatlh of

either the EBOP or ESOP.

See GE Station Design Notes on 196D5320. S1\L72ESOP_OL_A DC (Seal Oil) PUMP MOTOR OVERLOAD see above

S1\L30QE_T_F EMERGENCY LUBE OIL PUMP TEST FAILED


Until proven otherwise it should be considered that the motor is incapable

of starting. Situation should be investigated and resolved immediately.

Without backup EBOP or ESOP the unit should be shutdown.

EBOP & ESOP shold be tested weekly.

Lube Oil Conditioner

S1\L63QC1A DIRTY FILTER ALARM > 25 psid ( 1.72 Bar ) PS-273A

S1\L63QC2A OVERLOAD SHUTDOWN ALARMCheck suction strainer for clogging. Operator will need to manually reset

the motor at the LO Conditioner local junction box.

Hydraulic System Monitoring

S1\L33SSOV1_O_A SUCTION SHUT-OFF VALVE A NOT OPENValve should be open, check and resolve.

HFPM suctions are fit with manual shut-off valves to facilitate maintenace.

S1\L33SSOV2_O_A SUCTION SHUT-OFF VALVE B NOT OPEN see above

S1\L71HQHA HYDRAULIC OIL LEVEL HIGH

LT-280 Level alarm setpoints vary as per tank size.

Hydraulic fluid should be sampled as per GEK-46537 page #7. High or

Low alrms should be explained immediately.

Hydraulic leaks should not be tolerated.S1\L71HQLA HYDRAULIC OIL LEVEL LOW LT-280S1\L71HQLLA HYDRAULIC OIL LEVEL LOW LOW LT-280

S1\L30HQ_T_F HYDRAULIC FLUID PUMP TEST FAILED


Until proven otherwise it should be considered that the stanby HFPM motor

is incapable of starting.

Investigate and resolve immediately.

Design intent is that both HFPM are healthy at all times.

MKVI energizes FY-281 to intiate a start, alarm sounds with FY-281

energized > 15 seconds AND standby PS-280A or B not picked-up. Test

will auto cancel 5 seconds after a L30HQ_T_F goes logic "1".

Recommended weekly test.

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S1\L63DDF1A HYD-DUPLEX FILTER #1 DIFF PRESSURE HIGH

> 100 psid ( 6.9 Bar )

Switch to the standby pump.

Replace filter and put system back in Auto. (PDS-287A)S1\L63DDF2A HYD-DUPLEX FILTER #2 DIFF PRESSURE HIGH see above

S1\L63HQLA HYDRAULIC OIL PRESSURE LOW

PS-281A operates on decreasing 1950 psig for a 2400 psig system or 1300

psig for a 1600 psig system. The standby Hydraulic pump should start at

this pressure level.

S1\L63HQLT HYDRAULIC FLUID PRESSURE LOW TRIP

PS-281D, E, & F operate on decreasing 1650 psig for a 2400 psig system

or 1100 psig for a 1600 psig system. The three switches are voted in

software, any two operated for 1 second will initiate a Trip.

S1\L26HYDA HYDRAULIC OIL RESERVOIR TEMP HIGH

Fluid > 125F (52C) by TE-280

Check cooler operation.

System is designed to maintain the resevior below 125F (52C).

Cooling should activate by 120F (49C) and stop at 110F (43C).

The unit is capable of supporting unit MW production from 80~140F

(27~60C)

ref. 378A3137 S1\L63PDAH_ALM HYDRAULIC FLUID POLISHING FILTER DP HIGH PS-222 is set at 35 PSID +/- 5

Turning Gear

With the C7 in production the Turning Gear should be kept in Auto.

This provides the highest level of reliability/availability as in the event of an

unexpected shutdown the unit will automatically "go-on" gear and so be in

the best possible condition for any restart.

LOGIC, on shutdown IF in AUTO, the PBM will start IF all ST SV's are

closed AND LO permit is OK. Once at "Zero-Speed" (L14HRA=1) the air

piston will force the gear into engagement and PBM will stall. With

engagement established via ZS-288, a 10 second timer counts down and

then the TGM starts AND the PBM stops. Turning Gear

S1\L30TG_A TURNING GEAR NOT IN AUTO

HMI soft-switch is not in Auto (Operator may have selected Manual at HMI)

and the Field Flashing Speed relay is dropped out, L15HF=0 (pick-up's on

95% speed increasing, drops-out on 90% decreasing speed) It is

recommended that the Turning Gear control remain in Auto during

operations

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S1\L30TG_STDBA TURNING GEAR NOT IN STANDBY

HS-288 at JB #4 is not in "Standby" position AND

the Field Flashing Speed relay is dropped out "L14HF=0"

(L14HF picks-up's on 95% speed increasing AND drops-out on 90%

decreasing speed)

NOTE #1 HS-288 will spring return to Standby from all positions, but, can

be pulled out and locked in the "Stop" position.

#2 the Turning Gear will not automatically engage if HS-288 is placed in the

"Stop" detent position.

#3 It is recommeded the Turning Gear be in "Standby" at JB #4 AND in

"Auto" on the MKVI HMI whenever the unit is in operation.

S1\L30TGL TURNING GEAR LIMIT SWITCH TROUBLE

The MKVI uses two limit switches to indicate engaged OR dis-engaged

position of the turning gear.

The switches currently indicate a mutually exclusive condition. One

indicates the Turning Gear is Engaged while the other indicates it is Dis-

engaged, OR vice-versa. These switches are critical to proper automatic

sequencing; immediate investigation is needed.

(ZS-288=Engage Position Switch)(ZS-289=Dis-Engage Position Switch)

S1\L30TGS TURNING GEAR NOT ROTATING TURBINE

Turning Gear Engage Limit switch indicates the Turning Gear is engaged,

AND the zero-speed relay is picked-up (L14HR=1) indicating speed is

below the zero speed set-point of 0.06% of rated.

Comment: When on Turning Gear turbine rotor speed should be enough

to "drop-out" the zero-speed relay, or above 0.09% of rated. Investigate.

S1\L63TGDPA TURNING GEAR COMPT LOW DIFF PRESSURE

TG Compartment Vent Fan NOT running

At least one of the two TG Compartment Vent fans should be running with

the unit in operation or with H2 loadd in the generator.

PDSL-2890 monitors fan operation by monitoring differential pressure

across the fan (0.2" H20, 5.8mm H2O)

S1\LLOTOR_TG LUBE OIL TEMP OUT OF RANGE FOR TG

Turning Gear indicates engaged (ZS-288),

AND

LO temperature is < 80F (26.6C) OR > 90F (32.2C) (TE-260B).

Refer to GEK-72345 with regards temperature on Turning Gear.

S1\L14HRA ZERO SPEED

Used as a Turning Gear "Engage" permissive. Three (3) separate

systems must all agree that the unit is at or below zero speed;

(I) Primary Speed Control

(II) Emergency Speed Control

(III) BNC Keyphasor

(Note: Zero-Speed-Relay driven by the primary speed control system picks-

up <2.2 rpm and drops-out >3.5 rpm)

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* Steam Seal System Monitor w/Exhaust Pressure

Protection

* * Steam Pressure

* S1\L30SSHA STEAM SEAL PRESSURE HIGH Steam Seal Manifold Pressure > 6.0 psig ( 0.4 Bar ) PT-212

*

S1\L30SSLA STEAM SEAL PRESSURE LOW

Steam Seal Manifold Pressure < 2.0 psig ( 0.14 Bar )

AND HMI SS System ON

OR small Exhaust Vacuum present; 29"HgAbs ~ 0.92"HgVac

( 983mBarAbs ~ 30 mBarVac )

* S1\L30SSPC_OFF STEAM SEAL PRESS CONTROL OUT OF SERVICE

Turbine exhaust pressure is < 29" HgA ~ 0.92"HgV

( 983mBarAbs ~ 30 mBarVac )

AND Steam Seal system is selected "OFF" at the HMI.

* Gland Exhauster

*

S1\L30GSEA GLAND EXHAUSTER PRESSURE HIGH

Operator has selected Steam Seals "ON" at the HMI

AND PS-212c indicates the Fan is not running.

PS-212c operates at 5"H2OVac.

Exhauster must pull at least 5" H2OVac (12.5 mBarVac ~ 1000.8 mBarAbs

) to indicate a running fan.

(1) Check the fan

(2) Check the gland condenser for proper drainage.

* S1\L71CCAH_A GLAND EXHAUST CONDENSER LEVEL HIGH

LS-232 indicates condensate is not draining. The condenser must drain in

order to operate effectively. Check the drain system and resolve.

*

S1\L26GSEXHA GLAND SEAL EXHAUST TEMPERATURE HIGH

TE-212B located at the suction of the gland exhauster fan exceeds

165F ( 73.8C ) (should approximate 150F ~ 65.5C ).

(1) Check that the gland exhauster is draining properly.

(2) Check condensate flow to the exhauster.

* S1\L26SS_HA HIGH STEAM SEAL TEMPERATURE Variable as per HP/RH Bowl Metal & Load see GEK-110856B Fig. 8

* S1\L26SS_LA LOW STEAM SEAL TEMPERATURE Variable as per HP/RH Bowl Metal & Load see GEK-110856B Fig. 8

* * Exhaust Vacuum

* S1\L63EV_NARM EXHAUST VACUUM PROTECTION NOT ARMEDExhaust Vacuum Protection arms as turbine speed exceeds 300 rpm

(speed is below 300 rpm with alarm active)

Control monitors the Steam Seal Manifold Pressure (ssm) via PT-212. High & Low alarms sound IF the Steam Seal system is selected "On" at the HMI, OR,

Turbine exhaust pressure is < 29" HgA (0.92"HgV) (736.6 mmHgA)

(760 mmHgA = 14.7 psia = 29.92" HgA = 0.0"HgV = 1.03 Kg/sq.cm = 101.13 kPa = 1013.3 mBar = 406.8"H2O(A))

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*

S1\L63EVA EXHAUST VACUUM ALARM

non-Van: Control monitors PT-210A,B,C.

Alarms at 5"HgA ~ 169.5 mBarA (25.0" HgVac)

Unit with VAN: Alarm setpoint is variable as a function of LP steam flow;

PT-213A~C AND unit specific constants.

Exhaust Vacuum measured by PT-210A,B,C. Refer to GEK-103956

*

S1\L63EVT EXHAUST VACUUM TRIP

Non-Van; Three (3) conditions must exist for a Unit Trip;

#1. Speed > 300 rpm.

#2. Alarm at 5.0"HgA ~169.5mBarA (25"HgV) must exist.

#3. Trip at 7.5"HgA ~ 254mBarA (22.5"HgV) must exist.

Unit with VAN: Alarm & Trip setpoints are variable as a function of LP

steam flow. Flow is calculated by PT-213A~C AND unit specific constants.

Exhaust Vacuum is still measured by PT-210A,B,C.

Refer to GEK-103956

* S1\L30EV_DIF EXHAUST VACUUM TRANSDUCER FAULT

PT210A,B,C spread exceeds 2.0" Hg ~ 68mBar. Investigate and resolve

qucikly. Control selects the median value and passes same to the Exhaust

Vacuum Trip Protection.

Aux Steam Valves

Exhaust Hood Cooling Spray

Objective: Provide Exhaust Hood Cooling during extended low load

operation. This is a "stop-gap" measure only. Load will eventually need to

be increased or the unit secured. Exhaust Hood overtemperture protection

is alwys armed and caplable of tripping the unit. Ref. GEK-107098B. WSV

operates on the median of TE-210A,B,C.

S1\L30ES_FAIL EXHAUST HOOD SPRAY VALVE FAILED TO OPENMKVI is requesting the WSV open, the close position switch ZS-210A still

indicates closed after a 10 second time delay.

S1\L30ES_ON HOOD SPRAYS ON, OPER OF SPRAYS NOT ADVISED

This alarm will initiate at any time the WSV indicates NOT closed. While

short term use of water sprays not a problem, extended operation can lead

to increased risk of LSB erosion. (Switch Logic: ZS-210A WSV close

position switch initiates this alarm whenever it is not operated, WSV has

moved off the closed position (switch is NO, held closed when the WSV is

closed)) Ref. Basic SALI GEK-106919 60Hz or GEK-106752 50Hz

S1\L33ESV_ALM EXHAUST SPRAY VALVE TROUBLE

Close position switch ZS-210A indicates the WSV is closed AND open

position switch ZS-210B indicates the WSV is open, both conditions must

exist for 15 seconds.

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A B C D

Motor Operated Drain Valves

MOV Drains are designated Group A, B, or C by Starting and Loading

Instruction GEK-100475 & S&L Chart GEK-55212.

NOTE: Drains are either fully open or closed, throttling is required.

Group "A" Drains

MSCV #1 or "A" Before Seat Drain

C7 ATS Logic: Before Seat drain valves opens on MASTER RESET

"AND" HP Steam Header > 30 Psig (2.1 kg/cm2).

Valves close when the main breaker (52G) is closed.

S1\L30MOV_SSV1A MOV SSV1A NOT IN AUTO MODE

Alarm has two possible drivers

(1) operator has placed the valve in "Manual" at the HMI,

OR

(2) valve actuator has been placed in "Local".

Drains should be placed in Auto and so open and close as commanded by

the MKVI.

Any drain valve NOT reporting OPEN drops out "All Drains Open"...

L33DRAINS_OP=0. This then drop's out L33DRAIN_PER which in turn

drops out "Turbine Ready to Start" L3START=0. ATS sequence will not

initiate, the Turbine cannot be started in Auto.

S1\L30SSV1A_OPN MOV SSV1A OPEN AND HEADER PRESSURE LOW

Position feedback indicates the drain open, while HP Main Steam header is

below 30 psig. There is concern with regards water induction; backflow if

the drain is plumbed to a receiver/ADT. The drain should be closed with

the header below 30 psig.

S1\L30SSV1A SSV1A POSITIONING PROBLEM

Time to reach desired position has exceeded 30 seconds.

(1) Check the valve manually.

(2) 4~20mA valve position feedback device could have problems.

Any drain valve reporting a "positioning" alarm drops out "Drain Valves

Healthy"... L33DRAINS_OK=0. This then drop's out L33DRAIN_PER

which in turn drops out "Turbine Ready to Start" L3START=0. ATS

sequence will not initiate, the Turbine cannot be started in Auto.

MSCV #1 or "A" After Seat Drain C7 ATS Logic: After Seat dain valves open on MASTER RESET.

Valves close when the main breaker (52G) is closed.S1\L30MOV_SSV2A MOV SSV2A NOT IN AUTO MODE See comment for MOV SSV1A NOT IN AUTO MODES1\L30SSV2A SSV2A POSITIONING PROBLEM See comment for SSV1A POSITIONING PROBLEM

MSCV #2 or "B" Before Seat Drain see MSCV #1S1\L30MOV_SSV1B MOV SSV1B NOT IN AUTO MODE See comment for MOV SSV1A NOT IN AUTO MODE

S1\L30SSV1B_OPN MOV SSV1B OPEN AND HEADER PRESSURE LOW

Position feedback indicates the drain open, while HP Main Steam header is

below 30 psig. There is concern with regards water induction; backflow if

the drain is plumbed to a receiver/ADT. The drain should be closed with

the header below 30 psig. S1\L30SSV1B SSV1B POSITIONING PROBLEM See comment for SSV1A POSITIONING PROBLEM

MSCV #2 or "B" After Seat Drain see MSCV #1S1\L30MOV_SSV2B MOV SSV2B NOT IN AUTO MODE See comment for MOV SSV1A NOT IN AUTO MODE

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A B C D

S1\L30SSV2B SSV2B POSITIONING PROBLEM See comment for SSV1A POSITIONING PROBLEM

Group "B" Drains C7 ATS Logic: MOV-SPD opens on MASTER RESET.

Valves close with Load exceeding 17% of rated.

Steam Packing Re-Entry Valve (MOV-SPD)MOV_AOV.L30MOV_SPDSTM PKG RE-ENTRY DRN VLV MOV NOT IN AUTO MODE See comment for MOV SSV1A NOT IN AUTO MODEMOV_AOV.L30SPD STM PKG RE-ENTRY DRN VLV MOV POSITIONING PRB See comment for SSV1A POSITIONING PROBLEM

Group "C" DrainsC7 ATS Logic: Valves open on a MASTER RESET.

Valves close when the Admission Control Valve indicates 7% open.

Admission Control Valve Before Seat Drain

S1\L30MOV_SAD1 MOV SAD1 NOT IN AUTO MODE See comment for MOV SSV1A NOT IN AUTO MODES1\L30SAD1 SAD1 POSITIONING PROBLEM See comment for SSV1A POSITIONING PROBLEM

Admission Control Valve After Seat DrainS1\L30MOV_SAD2 MOV SAD2 NOT IN AUTO MODE See comment for MOV SSV1A NOT IN AUTO MODES1\L30SAD2 SAD2 POSITIONING PROBLEM See comment for SSV1A POSITIONING PROBLEM

* Hydrogen

* Hydrogen Purity

* S1\L30H2PUR_LA HYD PURITY LOW - INCREASING SCAVENGING

one or both H2 analzyers see SDE's below 85% or the Generator Casing

below 95% for 60 seconds. The MKVI will automatically increase

scavenging by energizing FY-2971, FY-2973 or both.

*

S1\L30H2PUR_LLA HYD PURITY LOW LOW - SHUTDOWN RECOMMENDED

Generator Casing below 90% for 3 seconds. Shutdown Recommended.

Hydrogen in Air mixtures in the range of 4.1 to 74.2 are explosive, with a

mixture of 30% H2 in Air being the most explosive.

*

S1\L30H2TRBL1A GAS ANALYZER #1 GENERAL FAULT

The E-One panel contains diagnostics which can be run locally via touch

keypads on the panel front. Press "Fn" key to "System" then press

"Enter". Obtain a copy of the correct E-One instruction manual for a full

explanation. Contact E-One directly

* S1\L30H2TRBL2A GAS ANALYZER #2 GENERAL FAULT see above

*

S1\LH2FDPA GEN ROTOR FAN DIFF PRESSURE HIGH

Delta across fan exceeds 30" H2O. As the unit is designed to operate in

Hydrogen, operation in air needs limits. Contact GE Generator Engineering

for unit specific limits if operation in air desired for any reason.

* * Dew Point Sensor

* S1\DTHYGH_ALM DEW POINT TEMPERATURE HIGH If provided 96RH-1 indicates dew point at 32F

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* S1\DTHYGHH_ALM DEW POINT TEMPERATURE HIGH HIGH If provided 96RH-1 indicates dew point at 60F

* S1\L30HYGFLT_A DEW POINT SENSOR FAULT (GENERATOR) If provided 96RH-1 indicates dew point below -145F

* * Gas Dryer

*

S1\L30DRYFLTA H2 GAS DRYER COMMON TROUBLE

These dryers are fit with a locally mounted microprocessor which is capable

of monitoring several process related items. Obtain the correct

manufacturers instruction and interrogate the processor via the local

keypad.

* S1\L30IGMA EXCESSIVE MOISTURE AT GAS DRYER INLET

Inlet to the dryer has a dew point exceeding 20F. MIC-2996 supplies a

switch contact to the MKVI, the actual Hygrometer probe ME-2996 is a 4-

20mA device.

*

* Generator Condition Monitor GCM-X (aka Gas

Monitoring System "GMS")

*

S1\L30GMFLT_A GENERATOR OVERHEATING NOT VERIFIED

Possibilities ... (1) The GCM indicated overheating but could not verify the

indication. (2) The GCM has verifed an alarm and is automatically collecting

a sample or the operator has manually requested verification (3) the GCM

continuously monitors itself and alarms various internal faults, the operator

can interrogate the GCM loaclly via the four-button membrane-switch

keypad, see Table #4 GCM-Statue. E-One refers to this as the "Trouble

Relay". One of three general purpose relays wired at GCM-X J1, GE

device = 30gmfault (signal = l3gmflt)

*

S1\L30GMS_A GMS INDICATED GENERATOR OVERHEATING

The GCM "Ion Chamber Detector" (ICD) has indicated a high level of

thermally decomposed particiles (or is completely off scale high,

>95%). Particles are produced when generator insulating materials

overheat. Also called the "Warning" level, with a factory setpoint of 70%,

the level is adjustable from 50~80%. A well calibrated GCM will indicate

80%. The GCM will automatically instigate a "verification" process when the

ICD drops below 50% for 4 seconds. Actual GCM ICD output is read locally

at he GCM panel via an LED bar graph. This alarm will require a manual

reset at the GCM panel. MKVI notification is provided by one of three

general purpose relays wired at GCM J1, E-One refers to this as the

"Warning Relay"; GE device = 30gmsalarm (signal = l26gms)

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*

S1\L30GMSVAL_A GENERATOR OVERHEATING VERIFIED

Possibilites ... (1) In Auto mode the ICD was below 50% for 4 seconds

and was verified. (2) Operator manually requested Alarm verifcation at the

GCM Panel and same was verified. If the Sampler is in Auto a sample will

be collected, alternately an Operator can manually request a sample. E-

One refers to this as the "Alarm Relay". One of three general purpose

relays wired at GCM-X J1, logic = l3gmsval (signal = 30msval) This alarm

will require a manual reset at the GCM panel.

* * Gas Supply

* S1\L63CT5L_ALM GENERATOR PURGE CO2 PRESSURE LOWSwitch only provided when requested. Adequate quanity of Purge CO2

MUST be on hand anytime the generator is charged with H2.

*

S1\L63GGPHA GENERATOR H2 GAS PRESSURE HIGH

PCV-2935 should automatically control machine pressure. PCV-2935 could

"stuck". Set-Point for this alarm will be 4 psig above unit rating, so 34 psig

for a 30 psig unit, 49 psig for 45 psig machine, etc.. MKVI monitors PT-

2950 to generate this alarm.

*

S1\L63GGPLA GENERATOR H2 GAS PRESSURE LOW

PCV-2935 should automatically control machine pressure. If PCV-2935 is

wide open and machine gas pressure is still dropping then a substansial H2

leak is occurring and the machine should be secured. Set-Point will be 2

psig below unit rating, so 28 psig for a 30 psig unit, 43 psig for 45 psig

machine, etc.. MKVI monitors both PSL-290 (63GL-1) and PT-2950, either

can trigger the alarm.

* S1\L63H2PLA HYDROGEN SUPPLY PRESS LOW (BOTTLE MANIFOLD)

* S1\LH2SPLA HYDROGEN SUPPLY PRESSURE LOW PSL-2930 Indicates supply manifold has dropped below 110.0 psig

* * Generator Stator Liquid Level Detectors

*

S1\LH2LLDHA GENERATOR LIQUID DETECTOR STAGE 1 HIGH

Could be Water or Oil. Empty the Detector and attempt to gauge amount.

This is not to be considered a normal event. The H2 coolers should be

tight all times, and Seal Oil should not be entering the Generator. Shutdown

may be required. LSH-2990

* S1\LH2LLDHHA GENERATOR LIQUID DETECTOR STAGE 2 HIGH see above. LSHH-2990

* * H2 Seal Oil Supply

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*

S1\L71SDH_ALM SEAL OIL DRAIN LIQUID LEVEL HIGH

Oil level at the CE SDE Enlargement is too high. Immediately check the

Float Trap for proper operation. If level at the Trap is out-of-sight high,

immediately manually bypass the float trap until such time as a level is

again visible in the float trap sight glass. This operation will require a

dedicated operator. The operator can manually drain LSH-3401 in an

attempt to guage oil quanity. High level danger is twofold, (1) a high oil

level at the SDE will first contaminate, and render useless the H2 monitors

(2) extra high levels will eventually spill past the inner oil deflectors and

contaminate the stator.

*

S1\L63DSA_LA SEAL OIL DIFF PRESSURE LOW

At Generator centerline Seal Oil pressure is kept greater than Generator

Hydrogen by a 5 psi delta. PDSL-3402 monitors this delta and is set to

alarm when this delta at machine centerline drops below 4.5 PSID. As

PDSL is located at the seal oil skid elevation and not directly at machine

centerline. Fir this reason the actual actuation set-point of the switch needs

to be compensated at each installation. PDSL needs to operate when the

psid; Seal Oil to Machine Gas Pressure "at-unit-centerline" has dropped

below 4.5 psi. (see GEK-95180 for Generator Seal Oil details)

NOTE #1: PDSL 3406 also located at the seal oil skid needs similar

compensation. It will start either the EBOP or ESOP at 2.5~3.5 psid.

NOTE #2 PS-3404 will start start either the EBOP or ESOP when supply oil

pressure being delivered the to skid drops below 65~80 psig. For both Note

#1 & #2 see the unit specific Device Summary for actual set-points.

* S1\L63SOFA SEAL OIL FILTER DIFF PRESSURE HIGHSome units are furnised with Filters. Change the filters when the psid = 6.

The Alarm sounds at 8 psid

* * Generator Stator H2 & Stator Bars

* S1\L26GGCA GENERATOR COLD GAS TEMPERATURE HIGH 145F

* S1\L26GGHA GENERATOR HOT GAS TEMPERATURE HIGH 212F

* S1\L26GGCS GEN COLD GAS HIGH TEMPERATURE SPREAD

Each Cooler has an RTD which monitors outlet or "cold" gas temperature.

Spread form high to low exceeds 15F in excess of 30 seconds. Check

cooling water flow to each cooler.

* S1\L26GGCF GEN COLD GAS RTD OUT OF LIMIT FAILURE one or more RTD's >800 F or <-100F

* S1\L26GGHF GEN HOT GAS RTD OUT OF LIMIT FAILURE one or more RTD's >800 F or <-100F

* * S1\L26GGFA GENETATOR RTD FAILURE DETECTED one or more RTD's >800 F or <-100F

* S1\L26GGFH_ALM GENERATOR RTD HIGH FAILURE DETECTED one or more RTD's >800F

* S1\L26GGFL_ALM GENERATOR RTD LOW FAILURE DETECTED one or more RTD's <-100F

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* * * S1\L26GGK_ALM GEN FRAME COMMON COLD GAS HIGH TEMP >145F

* * S1\L26GSA1 STATOR TEMP TOO HIGH (1 Or More RTDs) >275F

* S1\L26GSA2 STATOR TEMP TOO HIGH (2 Or More RTDs) >275F

* * S1\L26GSAF STATOR COLL END RTD OUT OF LIMIT FAILURE one or more RTD's >800 F or <-100F

* S1\L26GSFF STATOR CPLG END RTD OUT OF LIMIT FAILURE one or more RTD's >800 F or <-100F

* *

* Generator Protection and Excitation

* S1\L74GP_1_AL Primary 125VDC power to GP2100 lost

* S1\L74GP_2_AL 125VDC power to Brkr protection in GP2100 lost

* S1\L74GP_3_AL Redundant 125VDC power to GP2100 lost

* * * S1\L86BFT_ALM BREAKER FAILURE LOCKOUT TRIP

* S1\L86G1A_ALM UNIT TRIP VIA 86G1A LOCKOUT RELAY

* S1\L86G1B_ALM UNIT TRIP VIA 86G1B LOCKOUT RELAY

* S1\L86IE_AL GENERATOR BREAKER TRIPPED VIA 86IE

* S1\L86S AUTO SYNCHRONIZING LOCKOUT

* S1\L86T_AL GSU Transformer Lockout Trip

* S1\L86U_AL Generator and GSU Transformer Lockout Trip

* S1\LC60_60_AL C60 : Voltage unbalance detected

* S1\LC60_BF_AL C60 : Breaker failed to trip

* S1\LC60_FA_AL C60 : Critical Relay failure

* S1\LC60_TRP_AL C60 : Relay tripped

* S1\LC60_VTF_AL C60 : Voltage Transformer Fuse Failure

* S1\LG60_24_AL G60 : Excessive volts per hertz

* S1\LG60_27_AL G60 : Generator Undervoltage

* S1\LG60_46_AL G60 : Negative sequence Overcurrent

* S1\LG60_59_AL G60 : Generator Overvoltage

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* S1\LG60_81O_AL G60 : Generator overfrequency

* S1\LG60_FA_AL G60 : Critical Relay failure

* S1\LG60_TRP_AL G60 : Relay tripped

* S1\LG60_VTF_AL G60 : Voltage Transformer Fuse Failure

* S1\LG60B_FA_AL G60B : Critical Relay failure

* S1\LG60B_TRP_AL G60B : Relay tripped

* S1\LG60B_VTF_AL G60B : Voltage Transformer Fuse Failure

* S1\LT60_FA_AL T60 : Critical Relay failure

* S1\LT60_TRP_AL T60 : Relay tripped

* S1\LT60B_FA_AL T60B : Critical Relay failure

* S1\LT60B_TRP_AL T60B : Relay tripped

* S1\L94GEN GENERATOR VENTILATION TROUBLE SHUTDOWN

* S1\L50AT2FA_ALM AUX PWR XFMR OVERCURRENT RELAY FAILURE

* S1\L30DGP_F Gen Prot - SHUTDOWN TIMER INITIATED

* S1\L30DGP_SD GEN PROT FAILURE - SHUTDOWN INITIATED

* Excitation

*

S1\LPTBAD EX2K FORCED TRANSFER TO MANUAL REGULATOR

EX2100 has automatically transferred out of AUTO into MANUAL

excitation. #1 Operator must manually adjust terminal voltage at the HMI or

locally at the EX2100 (manually manage VARS) #2 Maintenance

should prepare an RCA.

*

S1\LRSTXLTCH EX2K FORCED TRANSFER TO BACKUP CORE

Primary Core Fault, EX2100 automatically shifted to the Back-Up Core.

The EX2100 has two (2) complimentary redundant excitors. Normally the

"primary" is in operation with the "back-up" continuously performing

calculations in the background, but "not" out-putting control commands.

Following a auto-transfer the Back-Up core is now in operation. Auto-

Transfer is designed to be bumpless. Maintenance should perform an RCA

investigation as to why the transfer was needed. NOTE; once the fault is

cleared and the Primary considered ready for operation the operator will

need to locate the "Reset Xfer" button on the HMI, execute the command

and so enable "automatic transfer"

* S1\L3D_UCVB_AF UCVB AIRFLOW OR OVERTEMPERATURE TROUBLE

* S1\L3D_UCVB_OT UCVB OVERTEMPERATURE

* S1\L43EX_ALM EX2K MANUAL (FVR) REGULATOR ACTIVE

This Alarm used for indication only. Operator is manually adjusting the

voltage regualtor. (aka, "Field Voltage Reg." or "DC Reg" or "Manual

Voltage Reg."

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* S1\L4EXOFF_ALM EX2K OPERATOR SELECTED EXCITATION OFF This Alarm used for indication only. Operator has shut-off the EX-2100.

* S1\L30EX_FSP EXCITER FAILURE TO STOP

* S1\L30EX_FTS EXCITER FAILURE TO START

* S1\L30EX_RS EXCITER NOT READY TO START

*

S1\L30COM_EXFLT EXCITER TO MKVI COMMUNICATION FAULT

No heartbeat detected between MK VI and Exciter or EGD link between MK

VI and exciter is not healthy due to disconnect or communications problem.

Address communication problem, check all ethernet connections and

switches.

* S1\L30MRSYNC_AL SYNC INHIBITED - EX MAN REG ACTIVE

* *

* Automatic Turbine Start

* Auto Start Software

* S1\L30AS_NR AUTO START PERMISSIVES NOT SATISFIED

Investigate the premissive logical "L3START" to determine which

presmissive is causing the hold-out. Problem could also be that the stress

control algorithm is in a "stabilizing mode.

* S1\L30STEAM_HLD ATS STEAM CONDITIONS HOLDSee "Hold List". Determine which steam condition is causing the hold-out.

Investigate presmissive logical L3STEAM_OK

*

* Pre-Roll

* S43\L30ANY_ALM Process Alarm Hold-Prior to Roll Any Process Alarm exists with speed below 300 rpm.

* S43\L30ECH ECCENTRICITY HIGHEccentricity at or above 2 mils Pk-Pk with speed below 300 rpm (M,

L3START)

* S43\L30HPU ATS - Hydraulic Power Unit Pre-Roll Hold

L30HPU = 1, when PS-281A operates and alarms on decreasing 1950 psig

for a 2400 psig system or 1300 psig for a 1600 psig system and unit speed

is below 300 rpm.

* S43\L30LUB ATS - Lube Oil System Pre-Roll Hold

Speed < 300 rpm AND Bearing Header Pressure is in Alarm (< 10 psig at

unit centerline)(L63QLA=1) OR Lube Oil Outlet Temperature is in Alarm (>

130F) (L26LOCOHA=1) OR both.

* S43\L30SSS ATS - Steam Seal System Pre-Roll HoldPT-212 sees Steam Header HIGH (at or above 6 psig) OR LOW (at or

below 2 psig) with unit below 300 rpm.

* S43\L30STEAM_HLD ATS STEAM CONDITIONS HOLD

L30STEAM_OK = 0 with speed below 300 rpm. Logical L30STEAM_OK

requires several variables be in place; steam pressure, temperature, metal,

and flow premissives.

* S43\L30STR ATS - Excessive Turbine StressesHP or RH Rotor stresses exceed 60% of maximum allowable (surface or

bore) with speed below 300 rpm.

"HOLD LIST"

(Code D11 typical)

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A B C D

* S43\L68BT ATS - Bearing Metal Temperature HoldAny Journal or Thrust Bearing Metal TC in alarm with the unit below 300

rpm.

* S43\L68DP_H2 ATS - Generator Hydrogen Trouble HoldGenerator Gas Pressure is Low (L63GGPLA = 1) with the unit below 300

rpm

*

S43\L3VALVES_C Pre-Roll steam valve position problem

With speed setpoint command at zero CV's RSV's & IV's need to indicate

closed. Any open position with speed setpoint command at zero will set

L3VALVES_C = 1 (Note; if tracing this logical you will find the signal

databases at times refers to l83cvs_c as both "CV & MSV closed", when in

fact, for D11's it only indicates the MCV's are closed.

* Holds

* S43\L30H2PUR_LA HYD PURITY LOW - INCREASING SCAVENGING

One or both H2 analzyers see SDE's below 85% or the Generator Casing

below 95% for 60 seconds. The MKVI will automatically increase

scavenging by energizing FY-2971, FY-2973 or both.

* S43\L39VA_AU High Vibration Alarms for Auto Mode Any of the 12 radial vibration channels at or above 6 mils Pk-Pk.

* S43\L63EVA_L Exhaust Vacuum Pressure LowThe median of three transmitters PT-210A,B,C indicates Exhaust Vacuum

in Alarm at 5.0"HgA

* S43\LEXC_LA_STR ATS-Excessive Lookahead StressHP or RH Rotor calculated future stress levels exceed maximum allowable

(surface or bore). See GEK-

* S43\LLOT_HLD Lube Oil Temperature HoldHold IF Lube Oil at Cooler Outlet < 100F

with speed > 78% AND < 90%.

* S43\LLOTOR Lube Oil Temperature Out of RangeHold IF Generator Breaker is closed

AND Lube Oil at Cooler Outlet < 115F OR > 125F.

*

* * L4 Turbine Reset (TRUE) Turbine must be RESET

* L3STEAM_OK Steam Pressure and Temperature OK (TRUE) Steam Temperature & Pressure must be within limts

* L3TNHR_ZERO Speed Setpoint Command = 0.0% (TRUE) Speed Setpoint cannot exceed 0.0%

* L3CUST_PERM Customer Premissives to Roll Turbine (TRUE) All plant permissives must be satisfied

* L68DW_ATS Pre-Roll, Speed or Load Hold from ATS Hold List (FALSE) There can be NO holds active.

* L39DEA Differential Expansion Alarm (FALSE) Differential at Brg #2 must NOT be in Alarm

* L3HP_DIFF HP Steam to Metal Temp Delta OK(TRUE) Clarify 10-14-09 Average 1st Stage Bowl Metal & Average HP Inlet

Steam must be within 500F

* L3RH_DIFF RH Steam to Metal Temp Delta OK(TRUE) Clarify 10-14-09 Average Reheat 1st Stage Bowl Metal & Average

Reheat Inlet Steam must be within 500F

* L33DRAIN_PER Drains Open & Healthy Permissive(TRUE) Drains must be open and capable of reaching correct position in 30

seconds.

* L14HR HP Speed - Zero Speed (FALSE) Unit must NOT be at Zero Speed

"Turbine-Ready-to-Start " (L3START)

(Code D11 typical)

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* LLOAM Lube Oil Temp Above Min on TG (TRUE) Lube Oil at Cooler Oulet > 80F (26.6F)

* L3VIB_PERM Vibration Trip Permissive - Inhibit Start (FALSE) No vibration TRIP.

* L63TGDP_PERM Turning Gear Compartment Low Diff Start Permissive(TRUE) One TG Compartment fan must be running and register via PSDL-

2890.

*

* L26SS_PER Steam Seal Temperature Start Permissive (TRUE) Steam Seal Temperature must be between high and low limits.

* L30ECH_PER Eccentricity Start Permissive (TRUE) Eccentricity must be < Alarm setpoint

*

* L3TNH_START Speed at or Below Start Speed (FALSE) Speed > 50 RPM

*

*

*

L26INLET_OK

Average 1st Stage Bowl Metal & Average HP Inlet Steam

must be within 500F AND at least one 1st Stage Bowl

Metal TC AND one HP Steam TC need to be within limits

(instrument health check).

TRUE

* L63IP_L_OK HP Steam Pressure > 600 psig TRUE

* L63IP_H_OK HP Steam Pressure < 1500 psig TRUE

* L26IS_L_OK HP Steam Temp > 32F TRUE

* L26IS_H_OK HP Steam Temp < 1100F TRUE

* L26RHT_OK

at least one Reheat Bowl Metal TC AND at least one

Reheat Steam TC are within limits (instrument health

check).

TRUE

* L3FP_HRSP Hot Reheat Pressure > 1% TRUE

* L3HP_DIFFAverage 1st Stage Bowl Metal & Average HP Inlet Steam

must be within 500F TRUE

* OR

*

L26INLET_OK

Average 1st Stage Bowl Metal & Average HP Inlet Steam

must be within 500F AND at least one 1st Stage Bowl

Metal TC AND one HP Steam TC need to be within limits

(instrument health check).

TRUE

* L63IP_L_OK HP Steam Pressure > 600 psig TRUE

* L63IP_H_OK HP Steam Pressure < 1500 psig TRUE

* L26IS_L_OK HP Steam Temp > 32F TRUE

* L26IS_H_OK HP Steam Temp < 1100F TRUE

* L3RH_DIFFAverage 1st Stage Bowl Metal & Average HP Inlet Steam

must be within 500F TRUE

AND

OR

"Steam Pressure & Temperature OK " (L3STEAM_OK)

Logic needed to place L3STEAM_OK =1

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* L83FF In Forward Flow TRUE

* *

* Miscellaneous Control Elements

* PLU - EVA & Trip Anticipator

* Triggers

*

S1\LCVT_EVT CONTROL VALVE TRIGGER OCCURRENCE

The MKVI has "triggered" MCV closure.

MKVI Main Control Valve trigger function looks at the max error between

the position reference and actual valve position. When error exceeds 10%

the trigger is "pullled". Irregardless of which MCV is in error, both MCV's

will "fast" or "quick" close via the FASV's This is done prevent excessive

turbine acceleration and so limit max overspeed rpm. Once the danger of

excessive speed passes the FASV will de-energize and the MCV will revert

to an open position at whatever speed signal is the minimum.

* * * Overspeed Tests & Speed Related Alarms

* Overspeed Testing

* S1\L30OSTA SELECTED OVERSPEED TEST NOT RECOMMENDED

The Operator has selected either a Primary or Emergency Off Line Test,

the ATS Stress permissive is not enabled, L3_OS_ATS = 0.

The test should not proceed.

* S1\L30POST_OF_F OFF-LINE PRIMARY OVERSPEED TEST FAULTAlarm indicates two possible problems; (1) Test timed out, or (2) Unit

tripped but not via the Primary OS Protection.

* S1\L30EOST_OF_F OFF-LINE EMERGENCY OVERSPEED TEST FAULTAlarm indicates two possible problems; (1) Test timed out, or (2) Unit

tripped but not via the Emergency OS Protection.

* S1\L97EOS_FAL ON-LINE EMERGENCY OS TEST FAULT

See GEK-110293 which provides a description of this test. The Test can be

conducted daily. Note which core has failed X, Y or Z, contact GE.

* S1\L97POS_FAL ON-LINE PRIMARY OS TEST FAULT

See GEK-110293 which provides a description of this test. The Test can be

conducted daily. Note which core has failed R, S, or T contact GE.

* I&C Problems

*

S1\L12H_ACC_DECHP ACCEL/DECEL RATE TOO HIGH, LOSS OF PROT

SPD SIG

Unit Trip initiates due to failure of Emergency Speed probes and/or MKVI

PPRO panel components. Undertake a RCA investigation and resolve

before any re-start. Emergency speed probes ST-202A, B, C or MKVI

* S1\L12HA PRIMARY OVERSPEED TRIP

**Introduction MKVIe Off-Line Overspeed Testing **

GEK-110293 advises recommended tests. Permissives ... On a cold start DO NOT Off-Line Overspeed Test prior ro carrying 25% rated load for 3 hours,

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* S1\L12HA_P EMERGENCY OVERSPEED TRIP

*

* S1\L14TNH_DEV SPEED DEVIATION ABOVE LIMIT - TRIP

Primary & Emergency Speed channels deviate by more than 5%. Fully

investigate both channels and produce an RCA before any re-start

* S1\L30TN_ERR EXCESSIVE SPEED ERROR

Actual turbine speed compared to speed calculated by the MKVI is outside

predetermined limits. Completely check both the MKVI conduct an RCA

and instigate corrective action.

*

S1\L30TNF SPEED PICKUP FAILURE

Three possible problems…(1) Unit is reset at zero speed, (2) Protective

core speed channels indicate excessive deceleration, (3) RST indciate unit

speed PPRO sees no speed. Resolve before any restart, conduct RCA

and instigate corrective action.

* * Critical Speed

*

S1\L30AS_CRIT CRITICAL SPEED HOLD NOT ADVISED

Operator is manually controlling speed and is holding the speed

within the critical speed range; Not advised.

Operator should manually ramp unit up & down in a continuous manner if

for any reason he needs to hold in this range.

Normal SALI guidelines do not require any holds in this range.

Range 50Hz 1050~1500 RPM

Range 60Hz 1,105~1630 RPM

* S1\L30TNR_CRIT SPD TARGET WITHIN CRIT RANGE HOLD NOT ADV

Operator is manually controlling speed and has selected a speed hold

point within the critical speed range; Not advised.

Normal SALI guidelines do not require any holds in this range.

* * Pressure Transducers

* S1\L30AP_DIF ADMISSION PRESSURE XDUCER TROUBLE

Control monitors three (3) transducers. Alarm produced when spread from

high to low value exceeds 5%. Control selects the median value and

passes same to APL & APC.

* S1\L30IP_DIF INLET PRESURE TRANSDUCER FAULT

Control monitors three (3) transducers. Alarms when spread from high to

low value exceeds 5%. Control selects the median value and passes same

to IPL & IPC.

*

S1\L30HRHP_DIFF HOT REHEAT PRESSURE DIFFERENTIAL HIGH

Control monitors three (3) transducers. Spread from high to low value

exceeds 5%. Control selects the median value and passes same for use in

Intercept Valve Control and Forward-Reverse Flow modes.

* * * Generator Collector

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* S1\L26GAC23_ALM GENERATOR COLLECTOR INLET HIGH TEMP >113F

* S1\L26GAH17_ALM GENERATOR COLLECTOR OUTLET HIGH TEMPCollector Outlet Temp exceeds Inlet Temp. by 36F. Check inlet filters for

blockage.

* * * Generator Breaker

* S1\L52G1_ALM GENERATOR BREAKER TRIPPED

* S1\L52SXA GENERATOR BREAKER TRIPPED

* S1\L3BRKR SEQ BRKR TRIP FAILURE-ACTION REQUIRED

* * Limiters

*

S1\L30L_IPL_FL INLET PRESS FIXED LEVEL LIMITER LIMITING

"IPL Fixed Limiter" control sub-system is controlling the MCV by

placing a upper limit on it's open position. This subsystem is not

automatic , it must be enabled by the operator. It must be dis-abled for

start-up. This protection works to close the CV's if main steam pressure

drops below a fixed pressure set-point. Again this is used only at operator

discertion. Provides for protection against water induction and may help to

save a Boiler from tripping. GEK-107151 provides the basic concept and

discuss the "Rate Sensitive" Limiter in detail.

*

S1\L30L_IPL_RS INLET PRESS RATE SENSITIVE LIM LIMITING

"IPL Rate Limiter" control sub-system is controlling the MCV by

placing a upper limit on it's open position. Automatically enabled at all

times. This protection works to close the CV's if the “rate” of main steam

pressure decay exceeds the preset valve (changeable via constants

internal to the control, GE will provide initial settings, these may requiure

adjustment as per site conditions). Provides for protection against water

induction and may help to save a Boiler from tripping. See GEK-107151

*

S1\L30L_VPL VALVE POSITION LIMITER CONTROLLING

"VPL Limiter" control sub-system is controlling the MCV by placing a

upper limit on it's open position. Initially set on reset at CV wide open

position (120.0%) this function must be manually engaged if the operator

wishes such a limit. Operator can use to set a maximum limit (mechanical

stop) on the open position of the CV's. Can be used for CV testing or as a

safety device if balance of plant considerations demand the ST CV "not"

open wide.

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*

S1\L30L_AFL ADM PRESS CTRL FLOW LIMITED

Open position of the ACV is limited by the "Admission Flow Setpoint"

(AFLR). Contained within the APC sub-system is a flow control which is

generally used to ramp pressure control in and out of service. When

reset it defaults to zero holding the ACV closed, it's limit must be removed

via the operator at HMI or by a remote DCS signal (taken to 128%) such

that the APC signal controls upper open position of the ACV.

*

S1\L30L_APL ADMISSION PRESSURE LIMITING

"APL Rate Limiter" control sub-system is controlling the ACV by

placing a upper limit on it's open position. Automatically enabled at all

times. This protection works to close the ACV if the “rate” of Admission or

LP steam pressure decay exceeds the preset valve (changeable via

constants internal to the control, GE will provide initial settings, these may

requiure adjustment as per site conditions). Provides for protection against

water induction and may help to save a Boiler from tripping. See GEK-

107151

* * Shaft Voltage & Current Alarms

* S1\L30TSCH HIGH SHAFT CURRENT

Typically set at 4A rms. Investigate. See GEK 95154 for a full expanation

of the SVM. See GEI-87016 with regrads a manual test of bearing and seal

housing insulation.

* S1\L30TSVH HIGH SHAFT VOLTAGE Typically set at 6 Volts AC. See comments above.

* * * DCS & E-Stops

* * * Auto Stop Software

*

S1\L30SDTRIP SHUTDOWN TRIP

Alarm provides indication that an automatic "shutdown-Trip" was

initated by the MKVI. Two possible situations cause this trip; #1 Operator

has manually issued an "Auto Stop" command, unit sheds load at the a

rate of 20% minute, gen breaker opens on the reverse power relay, MKVI

Trips the ST (Shut-down Trip) (see HMI screen "Speed Control" for the

Auto-Stop command pushbutton) #2 An automatic

shutdown has been initiated as the result of DGP Protection Failure

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*

S1\L30STBK LOAD SETBACK IN PROGRESS

Alarm indicates a remote input to the MKVI has requested rapid

closure of the Main Control Valves. The Load-Setback function is

optional and provides a way for a remote customer input to quickly close

the steam control valves. Rate of closure is site specific. Reason for

initiation of the Setback is also site specific; bascially an abnormal plant

condition demands rapid closure of the steam inlet valves. Closure is

accomplised via the VPL sub-system.

* *

* MKVI Control Cabinet

* *

* S1\L26CTH_ALM CONTROL PANEL TEMPERATURE HIGH

One of more VTCC's exceeds 113F, on possible board problem (cold

junction sensors on TBTC board / possible board failure). Check Panel air-

con. Check individual sensors.

* S1\L27AC_DC1A INCOMING AC #1 POWER LOST Invetsigate & restore.

* S1\L27AC_DC2A INCOMING AC #2 POWER LOST Invetsigate & restore.

* S1\L27BATTA INCOMING BATTERY POWER LOST Invetsigate & restore.

*

S1\L27DZA 125VDC UNDERVOLTAGE

MK VI VCMI voltage monitor. Alarm if (+125V - (-)125V) < 90 VDC. Could

be a partial ground on either the -125 or -125 side of the DC bus to or in the

MK VI. Don't recommend troubleshooting while turbine running, Measure

each side to ground to see which is grounded and investigate ground from

there.

*

S1\L64D_PNA 125VDC GROUND

MKVI VCMI monitors +125V and -125V legs for ground. See GEH-6421I

Vol 1 Chapter 8 for actual alarm specifics. Advise against troubleshooting

on-line. Each side can be measured to confirm alarm condition. This

should be investigated and resolved at the earliest possible oppurtunity.

Typically caused by short or partial short to ground on one or more MK VI

I/O's. (typically found on digital I/O). Common during commissioning and

may occur if any re-wiring done during commercial ops. Could also be in

DC supply to DC breaker panel or to MK VI. Measure from each bus to

ground. Should be an even split of +/- 62.5 VDC. If + is less, then ground is

on (+) bus, if (-) is less, then ground is on (-) bus. Once suspect bus is

determined troubleshoot cause or contact GE.

* S1\L30FORCED FORCED LOGIC SIGNAL DETECTED

Someone has intentionally forced a signal in the MK VI. Operation is not

recommended with any signal forced. Can only view forced signals

inside Toolbox by selecting VIEW ->FORCE LISTS

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*

S1\L30COMM_IO_R VCMI IO STATE EXCHANGE FOR <R> FAILED

<R> VCMI card in slot 1 monitoring for unusual activity. VCMI board has

detected a problem with the IONet between this core and others. Check

toolbox for diagnostic alarms on VCMI. This may or may not indicate a

serious condition however data between cores for voting is shared over this

comm link. Investigate as per Toolbox diagnostic alarm. This alarm is

cleared by selecting DIAGNOSTIC RESET on the HMI. If the alarm persists

it should be investigated. If this cannot be easily determined or resolved

contact GE.

* S1\L30COMM_IO_S VCMI IO STATE EXCHANGE FOR <S> FAILED see above

* S1\L30COMM_IO_T VCMI IO STATE EXCHANGE FOR <T> FAILED see above

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c7 5-16-2010 rev-01 commented trips,alarms,events,holds

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