ML17263A194

Rev 7 to EOP AP-TURB.4, Loss of Condenser Vacuum.

ML17263A194
Person / Time
Site:	Ginna
Issue date:	03/24/1993
From:	Marlow T ROCHESTER GAS & ELECTRIC CORP.
To:
Shared Package
ML17263A191	List: ML17263A188 ML17263A193 ML17263A194 ML17263A197 ML17263A199 ML17263A200 ML17263A204
References
AP-TURB.4, NUDOCS 9304080158
Download: ML17263A194 (20)

Text

EOP: TITLE:

REV: 7 AP- TURB. 4 LOSS OF CONDENSER VACUUM PAGE 1 of 8 ROCHESTER GAS AND ELECTRIC CORPORATION GINNA STATION CONTROLLED COPY NUMBER TECHNICAL REVIEW PORC REVIEW DATE P T SUPERINTENDENT

-2( -9s EFFECTIVE DATE CATEGORY 1.0 REVIEWED BY:

9304080158 930330 PDR 'DOCK 05000244 P PDR

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EOP:

REV: 7 AP-TURB. 4 LOSS OF CONDENSER VACUUM PAGE 2 of 8 A. PURPOSE This procedure provides the necessary actions to control the plant with decreasing condenser vacuum.

B. ENTRY CONDITIONS/SYMPTOMS

1. ENTRY CONDITIONS This procedure is entered from AP-CW.1, LOSS OF A CIRC WATER PUMP, when a circulating water system malfunction is indicated.

2. SYMPTOMS The symptoms of LOSS OF CONDENSER VACUUM are;

a. Low or decreasing condenser vacuum, or

b. Annunciator J-16, MOTOR OFF CW-EH EMERG OIL SEAL OIL BU, lit, or

c. Annunciator H-7, or CONDENSER HI PRESSURE, 25.5" HG, lit,

d. PPCS high condenser backpressure alarm, or

e. Unexplained decreasing generator output.

EOP: TITLE:

REV: 7 AP-TURB. 4 LOSS OF CONDENSER VACUUM PAGE 3 of 8 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED

CAUTION o IF, AT ANY TIME DURING THIS PROCEDURE, A REACTOR TRIP OR SI OCCURS, E-Op REACTOR TRIP OR SAFETY INJECTION, SHALL BE PERFORMED.

o EXCESSIVE BACK PRESSURE MAY RESULT IN THE LAST ROW OF TURBINE BLADES OPERATING AS A COMPRESSOR PRODUCING BLADE LOADING OPPOSITE TO THE DIRECTION OF ROTATION AND CAUSING SEVERE BLADE VIBRATION.

NOTE: o PPCS backpressure readings (PBACK) should be verified by AO calculation from local readings for each condenser.

o Operation in the AVOID region should be limited to 20 minutes unless the cause of loss of vacuum has been corrected and backpressure is returning to normal.

1 Check Condenser Indications:

a. Condenser vacuum - GREATER THAN a. Perform the following:

20 INCHES HG  !

1) Verify turbine trip.

2) Go to AP-TURB.l, TURBINE TRIP WITHOUT RX TRIP REQUIRED, or

'-O, REACTOR TRIP or SAFETY INJECTION, as required.

b. Turbine back pressure - EACH b. IF in the AVOID region, THEN CONDENSER WITHIN LIMITS OF ad]ust turbine load (at 1%/min)

FIGURE BACK PRESSURE as necessary to return to the safe operating region.

IF in the DO NOT OPERATE region, THEN trip the reactor and go to E-O, REACTOR TRIP OR SAFETY INJECTION.

c. Condenser vacuum - STABLE OR c. Decrease generator load as INCREASING necessary to stabilize condenser vacuum.

IF vacuum can NOT be stabilized, THEN perform the following:

1) Decrease generator load to minimum.

2) Trip turbine.

3) Go to AP-TURB.1, TURBINE TRIP WITHOUT RX TRIP REQUIRED.

REV: 7 AP-TURB - 4 LOSS OF CONDENSER VACUUM PAGE 4 of 8 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT. OBTAINED 2 Dispatch AO To Perform Local Actions (Refer to Attachment COND VACUUM) 3 Check Condenser Circulating IF a loss of circulating water has Water System - OPERATING AS occurred, THEN go to AP-CW.1, LOSS REQUIRED OF A CIRC WATER PUMP:

o CW pump discharge valves - BOTH OPEN o CW pumps - BOTH RUNNING

EOP: TI TLE:

REV: 7 AP-TURB.4 LOSS OF CONDENSER VACUUM PAGE 5'of 8 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED

CAUTION o D/P LIMITS ON THE GENERATOR HYDROGEN COOLER AND CONDENSATE COOLER SHOULD NOT BE EXCEEDED (D/P LIMITS INDICTED AT D/P METERS AT MCB REAR).

o CLOSELY MONITOR FEED PUMP SUCTION PRESSURE WHEN ADJUSTING CONDENSATE COOLING VALVES.

4 Check Condensate Temperature Perform the following:

- LESS THAN 100'F (PPCS point ID T2053) a. Place S/G blowdown and sample valve master isolation switch to CLOSE.

b. IF condensate cooler in service, THEN perform the following:

l) Place generator hydrogen temperature controller in MANUAL at 50%.

2) Dispatch AO to throttle close condensate cooler bypass valve as necessary.

3) Ad]ust hydrogen temperature controller and condensate cooler manual bypass valve as necessary to establish maximum condensate cooling.

5 Check, Condenser

- For Air IF condenser inleakage is detected, Inleakage NO INLEAKAGE THEN perform the following:

DETECTED

a. Isolate if possible.

b, IF inleakage can NOT be isolated, THEN go to Step 6.

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EOP TITLE:

REV: 7 AP-TURB- 4 LOSS OF CONDENSER VACUUM PAGE 6 of 8 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 6 Monitor Condenser Indications: Return to Step 1.

o Condenser back pressure - LESS THAN FIGURE BACK PRESSURE o Vacuum - STABLE OR INCREASING 7 Establish Stable Plant Conditions:

a. Tavg - TRENDING TO TREF  !

a. Ad)ust control rods and turbine load as necessary to restore Tavg to Tref.

b. PRZR pressure - TRENDING TO b. Verify proper operation of PRZR 2235 PSIG heaters and spray or take manual control of PRZR pressure controller 431K. IF pressure can NOT be controlled, THEN refer to AP-PRZR.1, ABNORMAL PRESSURIZER PRESSURE.

c. PRZR level - TRENDING TO PROGRAM c. Verify proper operation of charging pump speed controllers OR take manual control of speed controllers to control PRZR level.

d. S/G level - TRENDING TO PROGRAM d. IF S/G levels NOT controlling in AUTO, THEN place affected main feed regulating valve(s) in manual and restore S/G level(s) to program.

I EOP: TITLE:

REV: 7 AP-TURB. 4 LOSS OF CONDENSER VACUUM PAGE 7 of 8 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 8 Establish Normal Plant Operation:

a. Verify EH control in AUTO IMP IN a. Place EH in AUTO IMP IN if desired.

b. Verify annunciator G-15, STEAM b, IF'avg within 6'F of Tref, THEN DUMP ARMED - EXTINGUISHED perform the following:

1) Ensure steam dump valves closed.

2) Reset steam dump.

c. Verify charging pump speed c. Place charging pump speed control in AUTO control in AUTO if desired.

d. Verify Rod Control Selector d. Place Rod Control Selector Switch in AUTO  ! Switch in AUTO if desired.

e. Dispatch AO to remove priming e)ector from service if desired

f. Verify S/G blowdown and sample f. Perform the following:

valve master isolation switch in REMOTE 1) Dispatch AO to locally isolate blowdown.

2) WHEN blowdown locally isolated, THEN place blowdown and sample valve master switch to REMOTE.

3) Direct AO to restore blowdown flow (Refer to T-14F, S/G BLOWDOWN SYSTEM STARTUP).

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EOP:

REV 7 AP-TURB. 4 LOSS OF CONDENSER VACUUM PAGE 8 of 8 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 9 Notify Higher Supervision 10 Return To Procedure Or Guidance In Effect

-END-

F.OP I TITLE:

REV: 7 AP>> TURB. 4 LOSS PF CONDENSER VACUUM PAGE 1 of 1 AP-TURB. 4 APPENDIX LIST TITLE 'PAGES

1) FIGURE BACK PRESSURE

2) ATTACHMENT COND VACUUM

EOP: T1TLE:

REV: 7 AP-TURB 4 LOSS OF CONDENSER VA~

PAGE .1 of 1 FIGURE BACK'RESSURE BACK PRESSURE (inches Hg) 7 INCREMENTS 0.2 inches Hg DO NOT OPERATE IN THIS REGION COMPUTER ADDRESS BAROMETRIC PRESS.-P3200HG CONDENSER VACUUM - P3201 BACK PRESSURE - PBACK OR USE AUX. OPERATOR CALC.

AVOID OPERATION IN THIS REGION SATISFACTORY OPERATING REGION INCREMENTS 20 MW 100 200 300 400 500 600 GROSS ELECTRIC (MW)

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