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:

AP-TURB. 4 TITLE:

LOSS OF CONDENSER VACUUM REV:

7 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

I

)

f

EOP:

AP-TURB. 4 LOSS OF CONDENSER VACUUM REV:

7 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, CONDENSER HI PRESSURE, 25.5" HG, lit, or d.

PPCS high condenser backpressure alarm, or e.

Unexplained decreasing generator output.

EOP:

AP-TURB. 4 TITLE:

LOSS OF CONDENSER VACUUM REV:

7 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 20 INCHES HG

b. Turbine back pressure EACH CONDENSER WITHIN LIMITS OF FIGURE BACK PRESSURE

c. Condenser vacuum STABLE OR INCREASING

a. Perform the following:

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. IF in the AVOID region, THEN ad]ust turbine load (at 1%/min) 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. Decrease generator load as 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.

AP-TURB - 4 LOSS OF CONDENSER VACUUM REV:

7 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 Water System - OPERATING AS REQUIRED IF a loss of circulating water has

occurred, THEN go to AP-CW.1, LOSS OF A CIRC WATER PUMP:

o CW pump discharge valves BOTH OPEN o

CW pumps BOTH RUNNING

EOP:

AP-TURB.4 TI TLE:

LOSS OF CONDENSER VACUUM REV:

7 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

- LESS THAN 100'F (PPCS point ID T2053)

Perform the following:

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

a. Isolate if possible.

b, IF inleakage can NOT be

isolated, THEN go to Step 6.

I)

EOP AP-TURB-4 TITLE:

LOSS OF CONDENSER VACUUM REV:

7 PAGE 6 of 8 STEP ACTION/EXPECTED RESPONSE

RESPONSE

NOT OBTAINED 6

Monitor Condenser Indications:

o Condenser back pressure

- LESS THAN FIGURE BACK PRESSURE Return to Step 1.

o Vacuum - STABLE OR INCREASING 7

Establish Stable Plant Conditions:

a.

Tavg - TRENDING TO TREF b.

PRZR pressure

- TRENDING TO 2235 PSIG

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

b. Verify proper operation of PRZR 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:

AP-TURB. 4 TITLE:

LOSS OF CONDENSER VACUUM REV:

7 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 DUMP ARMED - EXTINGUISHED b, IF'avg within 6'F of Tref, THEN perform the following:

1) Ensure steam dump valves closed.

c. Verify charging pump speed control in AUTO

d. Verify Rod Control Selector Switch in AUTO

2) Reset steam dump.

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

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

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

f. Verify S/G blowdown and sample valve master isolation switch in REMOTE

f. Perform the following:

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).

I ~

EOP:

AP-TURB. 4 LOSS OF CONDENSER VACUUM REV 7

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 AP>>TURB. 4 TITLE:

LOSS PF CONDENSER VACUUM REV:

7 PAGE 1 of 1 AP-TURB. 4 APPENDIX LIST TITLE

'PAGES 1)

FIGURE BACK PRESSURE 2)

ATTACHMENT COND VACUUM

EOP:

AP-TURB 4 T1TLE:

LOSS OF CONDENSER VA~

REV:

7 PAGE.1 of 1 BACK PRESSURE (inches Hg) 7 INCREMENTS 0.2 inches Hg FIGURE BACK'RESSURE 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 GROSS ELECTRIC (MW) 500 600

e I

)

'N I h

4 A