ML17262A889

Rev 4 to EOP ES-0.2, Natural Circulation Cooldown.

ML17262A889
Person / Time
Site:	Ginna
Issue date:	05/06/1992
From:	ROCHESTER GAS & ELECTRIC CORP.
To:
Shared Package
ML17262A884	List: ML17262A883 ML17262A885 ML17262A886 ML17262A887 ML17262A888 ML17262A889 ML17262A890 ML17262A891 ML17262A892 ML17262A893 ML17262A895 ML17262A896 ML17262A897 ML17309A489
References
ES-.2, ES-0.2, NUDOCS 9206160396
Download: ML17262A889 (48)

Text

EOP:

REV: 4 ES-0.2 NATURAL CIRCULATION COOLDOWN PAGE 1 of 17 ROCHESTER GAS AND ELECTRIC CORPORATION GINNA STATION CONTROLLED COPY NUMBER TECHNICAL REVIEW PORC REVIEW DATE PLANT SUPERINTENDENT E EC IVE DATE CATEGORY 1'.0 REVIEWED BY:

920bib039b 920b05 PDR ,ADOCK 05000244 P PDR

'1 EOP: TIILE:

REV' ES-0 ' NATURAL CIRCULATION COOLDOWN PAGE 2 of 17 A. PURPOSE This procedure provides actions to perform a natural circulation RCS cooldown and depressurization to cold shutdown, with no accident in progress, under requirements that will preclude any upper head void formation.

B. SYMPTOMS AND OR ENTRY CONDITIONS This procedure is entered from:

1) ES-0.1, REACTOR TRIP RESPONSE, when it, has been determined that a natural circulation cooldown is required.

ECA 0 ~ 1 g LOSS OF ALL AC POWER RECOVERY ITHOUT S I REQU IRED 2) when it has cooldown is been determined required.

that a W

natural circulation g

3) Other normal operating procedures when a natural circulation cooldown is required.

T1TLE:

REV: 4 ES-0 ' NATURAL CIRCULATION COOLDOWN PAGE 3 of 17 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED

• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • CAUTION o IF SI ACTUATION OCCURS DURING THIS PROCEDURE, E-O, REACTOR TRIP OR SAFETY INJECTION, SHOULD BE PERFORMED.

o VOIDING MAY OCCUR IN THE RCS DURING RCS DEPRESSURIZATION. THIS WILL RESULT IN A RAPIDLY INCREASING PRZR LEVEL.

NOTE: o Foldout page should be open and monitored periodically If conditions can be established for starting an RCP during this procedure, Step 1 should be repeated.

1 Try To Restart An RCP:

a. Establish conditions for a. Go to Step 2.

starting an RCP:

o Bus llA or 11B energized o Refer to Attachment RCP START

b. Start one RCP

c. Any RCP - RUNNING c. Go to Step 2 ~

d. Go to 0-2.2, PLANT SHUTDOWN FROM HOT SHUTDOWN TO COLD CONDITION

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EOP T!TLE:

REV 4 ES-0 ' NATURAL CIRCULATION COOLDOWN PAGE 4 of 17 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 2 Check VCT Makeup System:

a. Verify the following:

l) Boric acid flow control valve - SET FOR REQUIRED CSD CONCENTRATION

2) RMW mode selector switch in AUTO

3) RMW control armed - RED LIGHT LIT b, Check VCT level b. Manually increase VCT makeup flow as follows:

o Level - GREATER THAN 20%

l) Ensure BA transfer pumps and

-OR- RMW pumps running.

o Level - STABLE OR INCREASING 2) Place RMW flow control valve HCV-ill in MANUAL and increase RMW flow.

3) Increase boric acid flow as necessary.

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EOP:

REV 4 ES-0 ' NATURAL CIRCULATION COOLDOWN PAGE 5 of 17 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 3 Check Charging Pump Suction Aligned To VCT:

a. Check VCT level: a. IF VCT level can NOT be maintained greater than 5%, THEN o Level - GREATER THAN 20% perform the following:

o VCT makeup system - AVAILABLE 1) Ensure charging pump suction aligned to RWST o LCV-112B open o LCV-112C closed

2) Continue with Step 4. WHEN VCT level greater than 40%,

THEN do Step 3b.

b. Verify the following: b. Manually align valves as necessary, o LCV-112C - OPEN o LCV-112B - CLOSED 4 Borate RCS To Cold Shutdown Boron Concentration (Refer to Figure SDM) 5 Establish Maximum Rx Vessel Start fans as necessary.

Head Cooling:

o Check control rod shroud fans (45 kw) - BOTH RUNNING o Check one Rx compartment cooling fan (23 kw)- RUNNING

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EOP: T!TLE REV: 4 ES-0 ' NATURAL CIRCULATION COOLDOWN PAGE 6 of 17 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 6 Verify Adequate Shutdown Margin

a. Direct HP to'ample the RCS for boron concentration

~ RCS loop A

~ RCS loop B

~ PRZR

b. Verify boron concentration- b. Perform the following:

GREATER THAN REQUIREMENTS OF FIGURE SDM 1) Maintain RCS average temperature greater than 500'F until adequate SDM established.

2) Continue to borate as necessary.

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EOP: TITLE:

REV: 4 ES-0 ' NATURAZ, CIRCULATION COOLDOWN PAGE 7 of 17 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED CAUTION o IF CST LEVEL DECREASES TO LESS THAN 5 FEET, THEN ALTERNATE WATER SOURCES FOR AFW WILL BE NECESSARY (REFER TO ER-AFW.l, ALTERNATE WATER SUPPLY TO AFW PUMPS).

o SI MUST BE BLOCKED BEFORE S/G PRESSURE DECREASES TO 514 PSIG.

o THE bT BETWEEN PRZR LIQUID AND THE HOT LEG TEMPERATURE SHOULD NOT BE PERMITTED TO EXCEED 200'F. IF THIS LIMIT IS EXCEEDED, THEN NOTIFY TECHNICAL ENGINEERING OF THE MAXIMUM AT OBSERVED.

7 Initiate RCS Cooldown To Cold Shutdown:

a. Dump steam tocondenser a. Manually or locally dump steam using S/G ARVs.

b. Establish and maintain cooldown rate in RCS, cold legs - LESS THAN 25'F/HR

c. Maintain S/G narrow range level c. Control feed flow as necessary.

BETWEEN 17% AND 39%

d. Plot RCS cold leg temperatures and PRZR temperature twice per hour (Refer to 0-2.2, PLANT SHUTDOWN FROM HOT SHUTDOWN TO COLD SHUTDOWN, for plot paper) 8 Check RCS Hot Leg Return to Step 7.

Temperatures LESS THAN 550'F

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EOP:

REV: 4 ES-0 ' NATURAL CIRCULATION COOLDONN PAGE 8 of 17 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED NOTE: o If charging line to PRZR vapor ~T exceeds 320'F, then plant staff should be consulted before using auxiliary spray.

o WHEN using a PRZR PORV, THEN select one with an operable block valve.

o If auxiliary spray is in use, spray flow may be increased by closing normal charging valve AOV-294 and normal PRZR spray valves.

9 Depressurize RCS To 1950 PSIG:

a. Check letdown - IN SERVICE a. Try to establish letdown (Refer to Attachment LETDOWN).

IF letdown can NOT be established, THEN depressurize RCS using one PRZR PORV and go to Step 10.

b. Depressurize RCS using auxiliary b. IF auxiliary spray valve NOT spray valve (AOV-296) available, THEN use one PRZR PORV.

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EOP: TITLE:

REV: 4 ES-0.2 NATURAL CIRCULATION COOLDOWN PAGE 9 of 17 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED CAUTION SI ACTUATION CIRCUITS WILL AUTOMATICALLYUNBLOCK IF PRZR PRESSURE INCREASES TO GREATER THAN 1992 PSIG.

10 Check If SI Should Be Blocked:

a. Check the following: a. Return to Step 9.

o PRZR pressure - LESS THAN 1950 PSIG

-OR-o LOW PRZR PRESS BLOCK SAF INJEC status light - LIT

b. Place SI block switches to BLOCK

~ Train A

~ Train B

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c. Verify SAFETY INJECTION BLOCKED c. Maintain PRZR pressure greater status light - LIT than 1750 psig and S/G pressure greater than 514 psig until SI blocked.

11 Determine RCS Pressure And Temperature Limits:

a. Check control rod shroud fans a. Perform the following:

BOTH RUNNING

1) Maintain RCS pressure within limits of Figure NAT CIRC C/D WITHOUT SHROUD FANS.

2) Go to Step 12.

b. Maintain RCS pressure - WITHIN LIMITS OF FIGURE NAT CIRC C/D WITH SHROUD FANS

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EOP:

REV: 4 ES-0 ' NATURAL CIRCULATION COOLDOWN PAGE 10 of 17 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 12 Maintain PRZR Level Between 20% And 304 13 Monitor RCS Cooldown:

o Core exit T/Cs - DECREASING o RCS hot leg temperatures DECREASING o RCS subcooling based on core exit T/Cs - INCREASING o Cooldown rate in RCS cold legs LESS THAN 25'F/HR

~4 EOP: TITLE REV: 4 ES-0.2 NATURAL CIRCULATION COOLDOWN PAGE 11 of 17 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED NOTE: o If at any time it is determined that a natural circulation cooldown and depressurization must be performed at a rate that may form a steam void in the vessel, then procedure ES-0.3, NATURAL CIRCULATION COOLDOWN WITH STEAM VOID IN VESSEL, should be used.

o If charging line to PRZR vapor aT exceeds 320'F, .then plant staff should be consulted before using auxiliary spray.

o WHEN using a PRZR PORV, THEN select one with an operable block valve.

o If auxiliary spray is in use, spray flow may be increased by closing normal charging valve AOV-294 and normal PRZR spray valves.

14 Initiate RCS Depressurization:

a. Check letdown - IN SERVICE a. Try to establish letdown (Refer to Attachment LETDOWN).

IF letdown can NOT be established, THEN depressurize RCS using one PRZR PORV and go to Step 15.

b. Depressurize RCS using auxiliary b. IF auxiliary spray valve NOT spray valve (AOV-296) available, THEN use one PRZR PORV.

c. Plot RCS temperature and pressure on curve selected in Step 11 hourly

g~l EOP:

REV: 4 ES-0.2 NATURAL CIRCULATION COOLDONN PAGE 12 of 17 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 15 Continue Cooldown And Depressurization:

a. Check RCS cold leg temperature- a. Stabilize RCS temperature and go GREATER THAN 335'F to Step 15c.

b. Maintain cooldown rate in RCS cold legs - LESS THAN 25'F/HR

c. Maintain RCS temperature and c. Control RCS pressure as pressure within limits of Figure necessary to restore pressure/

determined previously temperature relationship to within limits of approprite Figure.

16 Establish Required RCS Hydrogen Concentration (Refer to S-3.3C, H2 OR 02 REMOVAL FROM PRIMARY SYSTEM BY BURPING VCT) 17 Check For Steam Void In Repressurize RCS within allowable Reactor Vessel: limits and continue cooldown.

o PRZR level - NO UNEXPECTED LARGE IF RCS depressurization must VARIATIONS continue, THEN go to ES-O.3, NATURAL CIRCULATION COOLDOWN WITH o RVLIS level (no RCPs) - GREATER STEAM VOID IN VESSEL.

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EOP: TITLE:

REV: 4 ES-0 ' NATURAL CIRCULATION COOLDOWN PAGE 13 of 17 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 18 Check Isolated:

If SI ACCUMs Should Be

a. RCS pressure - LESS THAN a. Continue with Step 19. WHEN RCS 1500 PSIG pressure is less than 1500 psig, THEN do Steps 18b through d.

b. Dispatch AO with locked valve key to locally close breakers for SI ACCUM discharge valves

~ MOV-841, MCC C position 12F

~ MOV-865, MCC D position 12C

c. Close SI ACCUM discharge valves c. IF any valve can NOT be closed, THEN perform the following:

~ ACCUM A, MOV-841

~ ACCUM B, MOV-865 1) Dispatch personnel to locally close valves, as necessary.

2) Maintain RCS pressure greater than 1000 psig until both SI ACCUMs isolated.

IF any SI ACCUM can NOT be isolated AND RCS depressurization to less than 1000 psig is required, THEN:

1) Open vent valves for unisolated SI ACCUMs.

~ ACCUM A, AOV-834A

~ ACCUM B, AOV-834B

2) Open HCV-945.

3) Maintain RCS pressure greater than SI ACCUM pressure.

d. Locally open breakers for MOV-841 and MOV-865

g4 EOP: TITLE:

REV: 4 ES-0 ' NATURAL CIRCULATION COOLDOWN PAGE 14 of 17 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 19 Maintain Letdown Flow:

a. Open letdown orifice valves as necessary

b. Adjust low pressure letdown control valve setpoint as necessary F

20 Maintain Required RCP Seal Perform the following:

Injection Flow And Labyrinth

'Seal D/P: o Adjust charging flow to REGEN Hx (HCV-142) as necessary.

o Labyrinth seal D/P to each RCP GREATER THAN 15 INCHES OF WATER -OR-o Seal injection flow to each RCP o Dispatch AO to adjust seal GREATER THAN 6 GPM injection needle valves if necessary.

~ RCP A, V-300A

~ RCP B, V-300B

EOP I TITLE:

REV 4 ES-0 ' NATURAL CIRCULATION COOLDOWN PAGE 15 of 17 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 21 Check If SI System Normal Shutdown Alignment Should Be Established:

a. RCS cold leg temperature - LESS a. Return to Step 15.

THAN 350'F

b. RCS pressure - LESS THAN b. Stabilize RCS temperature and 1500 PSIG return to Step 14.

c. Lock out SI system as follows:

1) Place all SI pump switches in PULL STOP

2) Locally close breakers for SI pump discharge valves to cold legs

~ MOV-878B, MCC D position 8C

~ MOV-878D, MCC D position 8F

3) Close SI pump discharge to cold legs

~ MOV-878B

~ MOV-878D

4) Locally open breakers for MOV-878B and MOV-878D

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EOP: TITLE:

REV: 4 ES-0+2 NATURAL CIRCULATION COOLDOWN PAGE 16 of 17 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 22 Check Can Be IfEstablished:

RHR Normal Cooling

a. RCS pressure - LESS THAN 400 PSIG a. Stabilize RCS temperature and return to Step 14.

b. Verify all SI pump switches in b. Return to Step 21.

PULL STOP

c. Sample the RHR system to ensure adequate boron concentration (Refer to Attachment RHR SAMPLE)

d. Place RCS overpressure- d. IF RCS overpressure protection protection system in service system can NOT be placed in (Refer to 0-7, ALIGNMENT AND service, THEN consult'lant OPERATION OF THE REACTOR VESSEL staff to determine if RHR normal OVERPRESSURE PROTECTION SYSTEM) cooling should be established and go to Step 23.

e. Establish RHR normal cooling (Refer to Attachment RHR COOL) 23 Continue RCS Cooldown To Cold Shutdown CAUTION DEPRESSURIZING THE RCS BEFORE THE ENTIRE RCS IS LESS THAN 200'F MAY RESULT IN ADDITIONAL VOID FORMATION IN THE RCS.

24 Continue Cooldown Of Inactive Portion Of RCS:

a. Cool upper head region using control rod shroud fans

b. Cool S/G U-tubes by dumping steam from all S/Gs

y>>A EOP:

TITLE'ATURAL REV: 4 ES-0 ' CIRCULATION COOLDOWN PAGE 17 o f 17 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED

• • • • • • • • • • • • • • • • • • 0 **********************

CAUTION IF LESS THAN TWO CONTROL ROD SHROUD FANS ARE RUNNING, THE UPPER HEAD REGION MAY REMAIN ABOVE 200'F FOR UP TO 29 HOURS AFTER REACHING CSD.

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25 Determine If RCS Depressurization Is Permitted:

a. Entire RCS - LESS THAN 200'F a. Do NOT depressurize RCS.

~ Core exit T/Cs Return to Step 23.

~ Upper head T/Cs

~ RCS hot leg temperature

~ RCS cold leg temperature

b. Check control rod shroud fan b. Consult Plant staff to determine status - BOTH RUNNING DURING wait period for upper head COOLDOMN cooling.

c. Maintain cold shutdown conditions (Refer to. 0-2.3, PLANT AT COLD SHUTDOWN)

-END-

EOP:

REV: 4 ES-0 ' NATURAL CIRCULATION COOLDOWN PAGE 1 of 1 ES-0.2 APPENDIX LIST TITLE PAGES

1) RED PATH

SUMMARY

2) FIGURE MIN SUBCOOLING

3) FIGURE SDM

4) FIGURE NAT CIRC C/D WITHOUT SHROUD FANS

5) FIGURE NAT CIRC C/D WITH SHROUD FANS

6) ATTACHMENT RCP START

7) ATTACHMENT LETDOWN

8) ATTACHMENT RHR COOL

9) ATTACHMENT RHR SAMPLE

10) FOLDOUT

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EOP:

REV: 4 ES-0.2 NATURAL CIRCULATION COOLDOWN PAGE 1 of 1 RED PATH

SUMMARY

a. SUBCRITICALITY Nuclear power greater than 54

b. CORE COOLING Core exit T/Cs greater than 1200'F

-OR-Core exit T/Cs greater than 700'F AND RVLIS level (no RCPs) less than 434 t'464 adverse CNMT]

c. HEAT SINK Narrow range level in all S/Gs less than 54

[254 adverse CNMT] AND total feedwater flow less than 200 gpm

d. INTEGRITY Cold leg temperatures decrease greater than 100'F in last 60 minutes AND RCS cold leg temperature less than 285'F

e. CONTAINMENT CNMT pressure greater than 60 psig

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EOP: TITLE:

REV' ES-0 ' NATURAL CIRCULATION COOLDOWN PAGE 1 of 1 FIGURE MIN SUBCOOLING NOTE: Subcooling Margin = Saturation Temperature From Figure Below [-] Core Exit T/C Indication RC S PRESSURE (PSIG) 2500 2400 RCS PRESSURE 2300 INCREMENTS 20 PSIG 2200

'100 2000 1900 1800 1700 1600 1500 1400 SUBCOOLED 1300 REGION 1200 1100 1000 900 800 700 INADEQUATE SUBCOOLING 600 DVE RS REGION NMT 500 400 300 200 NORMAL CNMT TEMPERATURE INCREMENTS 10'F 100 0

200 250 300 350 400 450 500 550 600 650 700 CORE EXIT SATURATION TEMPERATURE ('F)

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EOP: TITLE:

REV: 4 ES-0 ' NATURAL CIRCULATION COOLDOWN PAGE 1 of 1 FIGURE SDM BORON CONCENTRATION (PPH) 1800 BORON INCREMENTS 20 PPH 1600 1400 ADE(UATE SDH 1200 100 PPH CONS ERVAT I SH INCLUDED 1000 800 600 400 BORA 200 BURNUP INCREMENTS 100 HWD/HTU 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 CYCLE 22 BURNUP (HWD/HTU)

NOTE: To obtain core burnup, use PPCS turn on code BURNUP.

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EOP: TITLE:

REV' ES-0.2 NATURAL CIRCULATION COOLDOWN PAGE 1 of 1 FIGURE NAT CIRC C D WITHOUT SHROUD FANS RCS PRESSURE (PSIG) 2500 2400 RCS PRESSURE NORMAL INCREMENTS RCS temp RANGE 2300 20 PSIG for S/G SI 2200 (514 psig) 2100 SI UNBLOCK 2000 1900 1800 1700 1600 1500 [1] Wait ll hrs before decreasing RCS pressure 1400 less than 600 psig 1300 1200 1100 1000 900 800 700 [2] Wait 29 hrs before decreasing RCS pressure 600 less than 350 psig to prevent boiling in 500 upper head 400 300 200 TEMPERATURE ioO INCREMENTS 10'F 0 50 100 150 200 250 300 350 400'50 500 550 600 650 700 RCS COLD LEG TEMPERATURE (')

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EOP: TITLE:

REV: 4 ES-0 ' NATURAL CIRCULATION COOLDOWN PAGE 1 of 1 FIGURE NAT CIRC C D WITH SHROUD FANS RCS PRESSURE (PSIG) 2500 2400 RCS PRESSURE INCREMENTS RCS temp 2300 20 PSIG for S/G SI 2200 (514 psig) 2100 SI UNBLOCK 2000 1900 1800 1700 1600 1500 1400 NORMAL 1300 RANGE 1200 1100 1000 900 800 700 600 500 400 300 200 TEMPERATURE INCREMENTS 10'F 0 50 100 150 200 250 300 350 400 450 500 550 600 650 700 RCS COLD LEG TEMPERATURE (')

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EOP: TITLE:

REV 4 ES-0.2 NATURAL CIRCULATION COOLDOWN PAGE 1 of 1 FOLDOUT PAGE RCP TRIP CRITERIA IF BOTH conditions listed below occur, THEN trip both RCPs:

a. SI pumps AT LEAST TWO RUNNING

b. RCS pressure minus maximum S/G pressure LESS THAN 175 PSIG

2. SI PUMP AUTO SWITCHOVER CRITERION WHEN BAST level decreases. to 10%, THEN ensure SI pump automatic switchover to RWST.

3 ~ SI ACTUATION CRITERIA IF EITHER condition listed below occurs, THEN actuate SI and go to E-O, REACTOR TRIP OR SAFETY INJECTION, Step 1.

o RCS subcooling based on core exit T/Cs LESS THAN O'F USING REQUIREMENTS OF FIGURE MIN SUBCOOLING OR o PRZR level CHARGING CAN NOT CONTROL LEVEL GREATER THAN 5%

4 ~ AFW SUPPLY SWITCHOVER CRITERION IF CST level decreases to less than 5 feet, THEN switch to alternate AFW water supply (Refer to ER-AFW.1, ALTERNATE WATER SUPPLY TO AFW PUMPS) .