ML17263A272

Rev 12 to EOP FR-H.1, Response to Loss of Secondary Heat Sink.

ML17263A272
Person / Time
Site:	Ginna
Issue date:	04/21/1993
From:	Marlow T ROCHESTER GAS & ELECTRIC CORP.
To:
Shared Package
ML17263A269	List: ML17263A268 ML17263A270 ML17263A271 ML17263A272 ML17263A273 ML17263A274 ML17263A275 ML17263A276
References
FR-H.1, NUDOCS 9305140051
Download: ML17263A272 (56)

Text

EOP: TITLE:

REV: 12 FR-H.1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE of 26 ROCHESTER GAS AND ELECTRIC CORPORATION GINNA STATION CONTROLLED COPY NUMBER TECHNICAL REVIEW PORC REVIEW ATE 8<y PLANT SUPER T DENT FECTIVE DATE CATEGORY 1.0 REVIEWED BY:

9305140051 930505 PDR

'~F ADQCK 05000244 PDR

0 EOP:

REV'2 FR-H.l RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 2 of 26 A. PURPOSE This procedure provides actions for responding

'to a loss of secondary heat sink in both S/Gs.

B. ENTRY CONDITIONS/SYMPTOMS

1. ENTRY CONDITIONS This procedure is entered from:

a. E-O, REACTOR TRIP OR SAFETY INJECTION, when minimum AFW flow is not verified AND normal range level in both S/Gs is less than 54 [254 adverse CNMT]

b. F-0.3, HEAT SINK Critical Safety Function Status Tree on a RED condition.

EOP: TITLE:

REV: 12 FR-H.1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 3 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED

• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • CAUTION o IF TOTAL FEED" FLOW IS LESS THAN 200 GPM DUE TO OPERATOR ACTION, THIS PROCEDURE SHOULD NOT BE PERFORMED.

o FEED FLOW SHOULD. NOT BE REESTABLISHED TO A FAULTED S/G IF A NON-FAULTED S/G IS AVAILABLE, NOTE: Adverse CNMT values should be used whenever CNMT pressure is greater than 4 psig or CNMT radiation is greater than 10+"> R/hr.

1 Check If Secondary Is Required:

Heat Sink

a. RCS pressure - GREATER THAN ANY a. IF RWST level greater than 28%,

NON-FAULTED S/G PRESSURE THEN go to E-l, LOSS OF REACTOR OR SECONDARY COOLANT, Step l.

IF RWST level less than 28%,

THEN go to ES-1.3, TRANSFER TO COLD LEG RECIRCULATION, Step 1.

b. Check the following: b. Try to place RHR System in service while continuing with o RCS cold leg temperature- this procedure:

350'F o

GREATER THAN RCS pressure - GREATER THAN

1) Reset SI if necessary.

400 psig [300 psig adverse 2) Place letdown pressure CNMT] controller in MANUAL CLOSED.

3) Check the following valves-OPEN' AOV-371, letdown isolation valve

~ AOV-427, loop B cold leg to REGEN Hx

~ At least one letdown orifice valve (AOV-200A, AOV-200B, or AOV-202)

4) IF pressure on PI-135 less than 400 psig, THEN establish RHR normal cooling (Refer to Attachment RHR COOL).

IF adequate cooling with RHR system established, THEN return to procedure and step in effect.

EOP:

REV: 12 FR-H.1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 4 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 2 Monitor Secondary Heat Sink: IF a loss of heat sink is indicated, THEN perform the o Verify either S/G level - WIDE following:

RANGE GREATER THAN 35 inches

[100 inches adverse CNMT] a. Trip both RCPs.

o Verify PRZR pressure - LESS THAN b. Go to Step 13 to ini.tiate bleed 2335 PSIG and feed cooling.

EOP: TITLE:

REV: 12 FR-H-1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 5 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 3 Try to Establish AFW Flow To At Least One S/G:

a. Check MCB indications for cause of AFW failure:

1) Verify CST level - GREATER 1) Refer to ER-AFW.1, ALTERNATE THAN 5 FEET WATER SUPPLY TO AFW PUMPS.

2) Verify busses supplying power 2) Continue attempts to restore to MDAFW pumps - ENERGIZED power to MDAFW pumps.

~ Bus 14

~ Bus 16

3) Check AFW valve alignment 3) Dispatch AO to locally align valves, as necessary.

o AFW pump discharge valves OPEN

~ MOV-4007

~ MOV-4008

~ MOV-3996 o TDAFW pump flow

• - OPEN control valves

~ AOV-4297

~ AOV-4298

b. Check AFW pumps - ALL RUNNING b. Perform the following:

1) Manually start MDAFW pumps.

2) Check TDAFW pump steam supply valves OPEN.

~ MOV-3504A

~ MOV-3505A

3) If necessary dispatch AO locally reset TDAFW pump to governor valve.

4) IF NO AFW pumps operable, THEN go to Step 4.

c. Check total flow to S/Gs c. Continue attempts to restore AFW GREATER THAN 200 GPM flow and go to Step 4.

d. Return to procedure and step in effect

~N EOP: TITLE:

REV: 12 FR-H. 1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 6 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 4 Stop Both RCPs

CAUTION IF OFFSITE POWER IS LOST AFTER SI RESET, THEN SELECTED SW PUMPS AND ONE CCW PUMP WILL AUTO START ON EMERGENCY D/G. MANUAL ACTION WILL BE REQUIRED TO RESTART SAFEGUARDS EQUIPMENT.

5 Reset SI If Actuated

EOP: TITLE:

REV: 12 FR-H.1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 7 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 6 Try To Establish MFW Flow To At Least One S/G:

a. Check any MFW pump - AVAILABLE a. Go to Step 7.

b. Check condensate system: b. IF offsite power available, THEN try to place condensate system o Condensate pump - ANY RUNNING in service.

o MFW pump suction pressure IF NOT, THEN go to Step 7.

GREATER THAN 185 PSIG

c. Establish MFW flow: c. IF MFW flow can NOT be established, THEN go to Step 7.

1) Check. MFW pump discharge valves - CLOSED

2) Verify MFW regulating or bypass valves - OPERABLE

3) Dispatch AO to restore MFW pump SW cooling

4) Verify S/G blowdown key switches in NORMAL

5) Ensure one MFW pump recirc valve -'OPEN

6) Start selected MFW pump

7) Open MFW pump discharge valve

8) Open MFW regulating or bypass valves as necessary to restore S/G level

d. Go to Step ll

EOP: TITLE:

REV: 12 FR-HE 1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 8 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 7 Establish SAFW Flow:

a. Perform the following: a. IF greater than 200 gpm, total SAFW flow can NOT be

1) Align SAFW system for established, THEN go to Step 8.

operation (Refer to Attachment SAFW)

2) Start both SAFW pumps

3) Verify SAFW total flow-GREATER THAN 200 GPM

b. Go to Step ll

CAUTION IF WIDE RANGE LEVEL IN BOTH S/GS DECREASES TO LESS THAN 35 INCHES [100 INCHES ADVERSE CNMT] OR IF PRZR PRESSURE INCREASES TO GREATER THAN 2335 PSIG DUE TO LOSS OF HEAT SINK, THEN. STEPS 13 THROUGH 15 SHOULD BE IMMEDIATELY INITIATED FOR BLEED AND FEED.

8 Establish Conditions to.Feed S/G(s) From Condensate System:

a. Check condensate pumps - ANY a. IF offsite power available, THEN RUNNING manually start at least one condensate pump. IF a condensate pump can NOT be

'.

started, THEN go to Step 12.

Establish condensate flowpath (Refer to Attachment COND to S/G)

c. De-energize PRZR heaters

4 ~ k EOP:

REV: 12 FR-H.1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 9 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 9 Establish Condenser Steam Dump Pressure Control:

a. Verify condenser available: a. Place S/G ARV controllers in AUTO at desired pressure and go o Any MSIV - OPEN to Step 10.

o Annunciator G-15, STEAM DUMP ARMED - LIT

b. Adjust condenser steam dump controller HC-484 to highest S/G pressure

c. Verify condenser steam dump controller HC-484 in AUTO

d. Place steam dump mode selector switch to MANUAL

'

• h ~ t=. 4, ~

EOP: TLTLE:

REV: 12 FR-H.1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 10 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED

CAUTION FOLLOWING BLOCK OF AUTOMATIC SI ACTUATION, MANUAL SI ACTUATION MAY BE REQUIRED IF CONDITIONS DEGRADE.

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

10 Establish Condensate Flow to S/G:

a. Check RCS pressure - GREATER a. Go to Step 10c.

THAN 1950 PSIG

b. Depressurize RCS to less than 1950 psig:

1) Check letdown - IN SERVICE 1) Use one PRZR PORV. IF IA to CNMT, AOV-5392, NOT open, THEN refer to Attachment N2 PORVS.

IF PORV NOT available, THEN use auxiliary spray valve, AOV-296 and go to step 10c.

2) Depressurize using auxiliary 2) Use one PRZR PORV. IF IA to spray valve (AOV-296) CNMT, AOV-5392, NOT open, THEN refer to Attachment N2 PORVS.

c. WHEN PRZR pressure less than 1950 psig, THEN place SI block switches to BLOCK

~ Train A

~ Train B

d. Verify SAFETY INJECTION BLOCKED status light - LIT

e. Manually open MFW flow control e. Manually open MFW flow control valves as desired bypass valves.

f. Dump steam to condenser at f. Manually or locally dump steam maximum rate to depressurize at using intact S/G ARV.

least one S/G to less than 380 psig

g. Verify condensate flow to S/Gs g. Go to Step 12.

EOP: TITLE REV: 12 FR-H.1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 11 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED

CAUTION IF CST LEVEL DECREASES TO LESS THAN 5 FEET, THEN ALTERNATE WATER SOURCES FOR AFW PUMPS WILL BE NECESSARY (REFER TO ER-AFW.1, ALTERNATE WATER SUPPLY TO AFW PUMPS).

11 Check S/G Levels:

a. Narrow range level in at least a. IF feed flow verified and level one S/G - GREATER THAN 58 [258 increasing in at least one S/G, adverse CNMT] THEN maintain flow to restore narrow range level greater than 58 [258 adverse CNMT]. .IF NOT verified, THEN go to Step 12.

b. Return to procedure and step in effect 12 Verify Secondary Heat Sink:

a. Check the following: a. IF loss of heat sink is indicated, THEN perform the o Either S/G level - WIDE RANGE following:

GREATER THAN 35 inches

[100 inches adverse CNMT] 1) Trip both RCPs.

o PRZR pressure - LESS THAN 2) Go to Step 13 to initiate 2335 PSIG bleed and feed cooling.

b. Return to Step 1

T t

TITLE:

REV: 12 FR-HE 1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 12 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED

CAUTION STEPS 13 THROUGH 15 MUST BE PERFORMED QUICKLY IN ORDER TO ESTABLISH RCS HEAT REMOVAL BY RCS BLEED AND FEED.

13 Actuate SI and CI

CAUTION WHEN BAST LEVEL DECREASES TO 10%, THEN SI PUMP AUTOMATIC SWITCHOVER TO RWST SHOULD BE ENSURED.

14 Verify RCS Feed Path: Manually start pumps and align valves as necessary to establish

a. Check SI pumps - AT LEAST ONE RCS feed path.

RUNNING IF a feed path can NOT be

b. Check valve alignment for established, THEN continue attempts operating SI pumps - PROPER to establish feed flow. Return to EMERGENCY ALIGNMENT Step 3.

EOP:

REV: 12 FR-H.1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 13 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 15 Establish RCS Bleed Path:

a. Open both PRZR PORV block valves a. Ensure power to MCCs supplying block valves.

~ MCC C for MOV-515

~ MCC D for MOV-516 IF any block valve can NOT be opened, THEN dispatch AO to locally check breaker:

~ MOV-515, MCC C position 6C

~ MOV-516, MCC D position 6C

b. Place both PRZR PORV switches to OPEN

c. Align RCS overpressure protection system to open both PRZR PORVs (Refer to Attachment N2 PORVS)

d. Verify PORVs - BOTH OPEN d. IF BOTH PRZR PORVs can NOT be opened, THEN ensure both PORV switches in OPEN.

'I II p

~ ~

EOP: TITLE:

REV: 12 FR-H.1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 14 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED

CAUTION IF OFFSITE POWER IS LOST AFTER SI RESET( THEN SELECTED SW PUMPS AND ONE CCW PUMP WILL AUTO START ON EMERGENCY D/G. MANUAL ACTION WILL BE REQUIRED TO RESTART SAFEGUARDS EQUIPMENT.

16 Check If SI Can Be Reset:

a. Check the following: a. IF PRZR pressure stable or increasing, THEN reset SI and go o PRZR pressure - LESS THAN to. Step 17 1750 PSIG 'F PRZR pressure decreasing,

-OR- THEN perform the following:

o Either steamline pressure- 1) WHEN PRZR pressure less than LESS THAN 514 PSIG 1750 psig, THEN reset SI.

2) Go to Step 17.

b. Reset SI 17 Reset CI:

a. Depress CI reset pushbutton

b. Verify annunciator A-26, b. Perform the following:

CONTAINMENT ISOLATION EXTINGUISHED 1) Reset SI.

2) Depress CI reset pushbutton

l" II l~

4 t k 0 ~ ~

EOP: TITLE REV: 12 FR-H.1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 15 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 18 Verify Adequate SW Flow:

a. Verify at least two SW pumps a. Manually start pumps as power RUNNING supply permits (258 kw each).

IF less than two SW pumps can be operated, THEN go to Step 21.

b. Verify AUX BLDG SW isolation b. Establish SW to AUX BLDG (Refer valves - AT LEAST ONE SET OPEN to Attachment AUX BLDG SW).

~ MOV-4615 and MOV-4734

~ MOV-4616 and MOV-4735

I' EOP:

REV: 12 FR-H.1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 16 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 19 Establish IA to CNMT:

a. Verify non-safeguards busses a. Perform the following:

energized from offsite power

1) Close non-safeguards bus tie o Bus 13 normal feed - CLOSED breakers:

-OR- ~ Bus 13 to Bus 14 tie

~ Bus 15 to Bus 16 tie o Bus 15 normal feed - CLOSED

2) Verify adequate emergency D/G capacity to run air compressors (75 kw each).

IF NOT, THEN evaluate RECIRC fans should be if CNMT stopped (Refer to Attachment CNMT RECIRC FANS).

3) WHEN bus 15 restored, THEN reset control room lighting.

b. Verify turbine building SW b. Manually align valves.

isolation valves - OPEN

~ MOV-4613 and MOV-4670

~ MOV-4614 and MOV-4664

c. Verify at least two air c. Manually start air compressors compressors - RUNNING as power supply permits (75 kw each). IF air compressors can NOT be started, THEN dispatch AO to locally reset compressors as necessary.

d: Check IA supply: d. Perform the following:

o Pressure - GREATER THAN 1) Continue attempts to restore 60 PSIG IA (Refer to AP-IA.1, LOSS OF INSTRUMENT AIR).

o Pressure - STABLE OR INCREASING 2) Continue with Step 21. WHEN IA restored, THEN do Steps 19e, f and 20.

e. Reset both trains of XY relays for IA to CNMT AOV-5392

f. Verify IA to CNMT AOV-5392 - OPEN

'

e

EOP: TITLE:

REV: 12 FR-H.1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 17 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 20 Restore RCS Overpressure Protection System To Standby:

a. Verify instrument bus D- a. Perform the following:

ENERGIZED

1) Ensure steam dump mode control in MANUAL.

2) Restore power to instrument bus D from MCC B or MCC A (maintenance supply).

b. Place relief valve PC-431 and PC-430 arming switches to BLOCK

~ SOV-8619A

~ SOV-8619B

c. Close SURGE TK VLVs

~ SOV-8616A

~ SOV-8616B NOTE: PRZR PORVs may close temporarily until adequate IA pressure is restored in CNMT.

21 Verify Adequate RCS Bleed Perform the following:

Patn:

a. Open Rx head vent valves.

o Core exit T/Cs - STABLE OR DECREASING ~ SOV-590

~ SOV-591 o Level (no RCPs) - GREATER THAN ~ SOV-592 68%'73% adverse CNMT] ~ SOV-593

b. Depressurize at least one intact S/G to atmospheric pressure using S/G ARV ~

c. Align any available low pressure water source to depressurized S/Gs.

EOP I TITLE:

REV: 12 FR-H.l RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 18 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED

CAUTION ACTIONS TAKEN TO INITIATE RCS FEED AND BLEED SHALL NOT BE REVERSED WHEN PERFORMING IMMEDIATE ACTIONS OF E-O, REACTOR TRIP OR SAFETY INJECTION.

22 Complete The Immediate Actions Of E-O, REACTOR TRIP OR SAFETY INJECTION, While Continuing With This Procedure CAUTION THE RCS BLEED PATH MUST BE MAINTAINED EVEN IF RCS PRESSURE REMAINS GREATER THAN SI PUMP SHUTOFF HEAD.

23 Maintain RCS Heat Removal:

o Maintain SI flow o Maintain both PRZR PORVs and block valves - OPEN 24 Check Normal Power Available Verify adequate emergency D/G To Charging Pumps: capacity to run charging pumps (75 kw each).

o Bus 14 normal feed breaker-CLOSED IF NOT, THEN evaluate if CNMT RECIRC fans can be stopped (Refer o Bus 16 normal feed breaker- to Attachment CNMT RECIRC FANS).

CLOSED

TITLE: 'I REV: 12 FR-H.1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 19 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 25 Check Been If Charging Established:

Flow Has

a. Charging pumps - ANY RUNNING a. Perform the following:

1) IF CCW flow is lost to any RCP thermal barrier OR any RCP ¹1 seal outlet temperature offscale high, THEN dispatch AO with key to RWST gate to locally close seal injection needle valve(s) to affected RCP:

~ RCP A, V-300A

~ RCP B, V-300B

2) Ensure HCV-142 open, demand at 0%.

b. Align charging pump suction to b. IF LCV-112B can NOT be opened, RWST: THEN perform the following:

o LCV-112B - OPEN 1) Verify charging pump A NOT running and place in PULL o LCV-112C - CLOSED STOP.

2) Dispatch AO to locally open manual charging pump suction from RWST (V-358 located in charging pump room).

3) WHEN V-358 open, THEN direct AO to close V-268 to isolate charging pumps B and C from VCT (V-268 located in charging pump room).

c. Start charging pumps as necessary and establish maximum charging flow

0 ll 1 ~ > I

EOP: TITLE:

REV: 12 FR-H.1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 20 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED

CAUTION o IF RWST LEVEL DECREASES TO LESS THAN 28%, THEN THE SI SYSTEM SHOULD BE ALIGNED FOR COLD LEG RECIRCULATION USING STEPS 1 THROUGH 13 OF ES-1.3, TRANSFER TO COLD LEG RECIRCULATION.

o IF CONTAINMENT PRESSURE INCREASES TO GREATER THAN 28 PSIG, CONTAINMENT SPRAY SHOULD BE VERIFIED.

o RHR PUMPS SHOULD NOT BE RUN LONGER THAN 1 HOUR WITHOUT CCW TO THE RHR HEAT EXCHANGERS.

26 Continue Attempts To Establish Secondary Heat Sink In At Least One S/G:

~ AFW flow

~ Main FW flow

~ Standby AFW flow

~ Condensate flow 27 Check For Adequate Secondary Heat Sink:

a. Check narrow range level in at a. Return to Step 26.

least one S/G - GREATER THAN 5%

[25% adverse CNMT]

b. Adjust S/G ARV controllers to existing S/G pressure

t

> ~

EOP:

REV: 12 FR-H.1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 21 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED

CAUTION IF THE RCS IS WATER SOLID, THEN ANY INCREASE IN RCS TEMPERATURE MAY RESULT IN A SIGNIFICANT RCS PRESSURE INCREASE. RCS HEATUP SHOULD BE PREVENTED.

28 Monitor RCS Temperatures: Perform the following:

o Core exit T/Cs - DECREASING a. Control steam dump and feed flow to establish natural circulation o RCS hot leg temperatures and stabilize RCS temperature.

DECREASING

b. Return to Step 26.

29 Check CCW Pumps ANY RUNNING Perform the following:

a. IF any RCP ¹1 seal outlet temperature offscale high, THEN isolate CCW to thermal barrier of affected RCP(s).

~ RCP A, MOV-749A and MOV-759A

~ RCP B, MOV-749B and MOV-759B

b. Manually start one CCW pump (124 kw).

30 Verify 'Reactor

Head Vent Manually close valves.

Valves CLOSED

~ SOV-590

~ SOV-591

~ SOV-592

~ SOV-593

I 4

EOP: TITLE:

REV: 12 FR-H.1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 22 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED

• • • • • • • • • • • • • • • • • • • • • • • • • • % **************

CAUTION IF RCS IS SOLID, THEN TERMINATION OF FEED AND BLEED MAY RESULT IN RAPID RCS.

PRESSURE INCREASE UNLESS RCS INFLOW AND OUTFLOW ARE CAREFULLY CONTROLLED.

31 Check Pumps If One Of Three SI Should Be Stopped:

a. Three SI pumps - RUNNING a. Go to Step 32.

b. RCS subcooling based on core b. Check the following:

exit T/Cs - GREATER THAN 35'F

[90'F adverse CNMT) USING FIGURE o RCS pressure greater than MIN SUBCOOLING 1625 psig [1825 psig adverse CNMT) o RCS subcooling based on core exit T/Cs greater than O' using Figure MIN SUBCOOLING IF NOT, THEN go to Step 34

'.

c. Check PRZR level - GREATER THAN Do NOT stop SI pump. Go to 13% [40% adverse CNMT] Step 34.,

d. Stop one SI pump

C EOP: TITLEI REV: 12 FR-H.l RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 23 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 32 Check Should IfBe OneStopped:

Of Two SI Pumps

a. Two.SI pumps - RUNNING a. Go to Step 33.

b.'etermine required RCS subcooling from table:

Charging PUIIlp RCS Subcooling Criteria Availability NONE 120'F [200'F adverse CNMT]

ONE 115'F [190'F adverse CNMT].

105'F [180'F adverse CNMT]

THREE 100'F [175'F adverse CNMT]

c. RCS subcooling based on core c. Check the following:

exit T/Cs - GREATER THAN VALUE FROM TABLE ABOVE USING FIGURE o RCS pressure greater than MIN SUBCOOLING 1625 psig [1825 psig adverse CNMT]

o RCS subcooling based on core exit T/Cs greater than O' using Figure MIN SUBCOOLING IF NOT, THEN go to Step 34.

d. PRZR level - GREATER THAN 13% d. Do NOT stop SI pump. Go to

[40% adverse CNMT] Step 34.

e. Stop one SI pump

EOP: TITLE:

REV: 12 FR-H. 1 RESPONSE TO LOSS .OF SECONDARY HEAT SINK PAGE 24 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 33 Check Be If Last Stopped:

SI Pump Should

a. One SI pump - RUNNING a. Go to Step 36.

b. Check the following: b. Go to Step 34.

o RCS subcooling based on core exit T/Cs greater than O' using Figure MIN SUBCOOLING o RCS pressure greater than 1625 psig [1825 psig adverse CNMT)

c. PRZR level - GREATER THAN 13% c. Do NOT stop SI pump. Go to

[40% adverse CNMT] Step 34.

d. Stop running SI pump

e. Go to Step 36 NOTE: After closing a PORV, it may be necessary to wait for RCS pressure to increase to permit stopping SI pumps in SI reduction steps.

34 Check PRZR PORVs And Go to appropriate plant procedure:

Associated Block Valves - ANY BLEED PATH OPEN o IF RWST level greater than 28%,

THEN go to E-l, LOSS OF REACTOR OR SECONDARY COOLANT.

-OR-o IF RWST level less than 28%,

THEN go to ES-1.3, TRANSFER TO COLD LEG RECIRCULATION.

t EOP: TITLE:

REV: 12 FR-H.1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 25 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED

CAUTION IF RCS IS SOLID, CLOSURE OF PORVS WILL RESULT IN RAPID RCS PRESSURE INCREASE UNLESS RCS INFLOW AND OUTFLOW ARE CAREFULLY CONTROLLED.

35 Isolate PRZR Bleed Paths:

a. PRZR PORVs - BOTH OPEN a. Perform the following:

1) Stop all but one charging pump ~

2) Control charging flow as necessary to maintain RCS pressure and PRZR level.

3) Establish excess letdown as follows:

o Place AOV-312 to NORMAL.

o Ensure CCW pump running.

o Manually open CCW from excess letdown Hx open (AOV-745).

o Open excess letdown isolation valve AOV-310.

o Slowly open HCV-123.

b. Close one open PRZR PORV b. Close PORV block valve. IF block valve can NOT be closed, THEN go to appropriate plant procedure:

o IF RWST level greater than 28%, THEN go to E-l, LOSS OF REACTOR OR SECONDARY COOLANT.

-OR-o IF RWST level less than 28%,

THEN go to ES-1.3, TRANSFER TO COLD LEG RECIRCULATION.

c. Return to Step 31

A EOP:

REV: 12 FR-H.1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 26 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 36 Check PRZR PORVs - BOTH CLOSED Close both PRZR PORVs. IF any PRZR PORV "can NOT be closed, THEN manually close its block valve.

37 Check Stopped:

If RHR Pumps Should Be

a. Check RCS pressure: a. Go to appropriate plant procedure:

1) Pressure - GREATER THAN 250 psig [465 psig adverse o IF RWST level greater than CNMT] 28%, THEN go to E-l, LOSS OF REACTOR OR SECONDARY COOLANT,

2) Pressure - STABLE OR Step 1.

INCREASING 'OR-o IF RWST level less than 28%,

THEN go to ES-1.3, TRANSFER TO COLD LEG RECIRCULATION, Step 1.

b. Stop RHR pumps and place in AUTO 38 Start Charging Pumps As Necessary And Control Charging Flow To Maintain PRZR Level 39 Go To ES-1.1, SI TERMINATION'tep 8

- END-

FOP:

REV 12 FR-H.1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 1 of 1 FR-H.l APPENDIX LIST TITLE PAGES

1) FIGURE MIN SUBCOOLING

2) ATTACHMENT CNMT RECIRC FANS

3) ATTACHMENT COND TO S/G

4) ATTACHMENT N2 PORVS

5) ATTACHMENT SD-1

6) ATTACHMENT RHR COOL

7) ATTACHMENT SAFW

8) ATTACHMENT AUX BLDG SW

EOP: T!TLE:

REV: 12 FR-H.1 RESPONSE TO LOSS OF SECONDARY HEAT SINK 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 INCREHENTS 20 PSIG 2200 2100 2000 1900 1800 1700 1600 1500 1400 SUBCOOLED 1300 REGION 1200 1100 1000 900 800 INADEQUATE 700 SUBCOOLING 600 REGION ADVERSE CNHT 500 400 300 200 NORHAL CNHT TEHPERATURE INCREMENTS 10'F 100 0

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

V V

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