ML17262A543

Rev 10 to EOP FR-H.1, Response to Loss of Secondary Heat Sink.

ML17262A543
Person / Time
Site:	Ginna
Issue date:	06/14/1991
From:	Widay J ROCHESTER GAS & ELECTRIC CORP.
To:
Shared Package
ML17262A536	List: ML17262A535 ML17262A537 ML17262A538 ML17262A539 ML17262A540 ML17262A541 ML17262A543
References
FR-H.1, NUDOCS 9107110296
Download: ML17262A543 (56)

Text

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EOP: TITLE REV: 10 F@-H. 1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 1 of 26 ROCHESTER GAS AND ELECTRIC CORPORATION GINNA STATION

'CONTROLLED COPY NUMBER TECHNICAL REVIEW PORC REVIEW DATE T SUPERINTEND NT C'

EF ECT E DATE CATEGORY 1.0 REVIEWED BY:

91,07110296 910619 PDR ADOCK 05000244 F PDR

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EOP:

REV: 10 FR-H.1 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.

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

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EOP: TITLE: REV: 10 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 28X, NON-FAULTED S/G PRESSURE THEN go to E-l, LOSS OF REACTOR OR, SECONDARY COOLANT, Step l.

IF RWST level less than 28X, 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:

GREATER THAN 350'F o 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 tEan 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.

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EOP:

REV: 10 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: Ip a loss of heat sink is indicated, THEN perform the o Verify either S/G level - WIDE folloving:

RANGE GREATER THAN 35 inches

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

o Verify PRZR pressure - LESS THAN b. Go to Step 12 to initiate bleed 2335 PSIG and feed cooling.

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EOP: T!TLE:

REV: 10 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-AFV.1, ALTERNATE THAN 5 FEET WATER SUPPLY TO AFV PUMPS.

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

~ Bus 14

~ Bus 16

3) Check AFV 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 control valves - OPEN

~ AOV-4297

~ AOV-4298

b. Check AFV 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 locally reset TDAFW pump "AO to governor valve.

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

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EOP: TITLE REV: 10 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

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REV 10 FR-H.1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 7 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED CAUTION IF OFFSITE POWER IS LOST AFTER SI RESET, SELECTED SW PUMPS AND ONE CCW PUMP VILL AUTO START ON EMERGENCY D/G. MANUAL ACTION VILL BE REQUIRED TO RESTART SAFEGUARDS EQUIPMENT.

5 Try To Establish MFW Flow To At Least One S/G:

a. Check any MFW pump - AVAILABLE a. Go to Step 6.

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

o MFV pump suction pressure- IF NOT, THEN go to Step 6.

GREATER THAN 185 PSIG

c. Reset SI if necessary

d. Establish MFW flow: d. IF MFV flow can NOT be established, THEN go to Step 6.

1) Check MFW pump discharge valves - CLOSED

2) Verify MFW flow control bypass valve - OPERABLE

3) Dispatch AO to restore MFV pump SV cooling

4) Verify S/G blowdown key switches in NORMAL

5) Ensure one MFV pump recirc valve - OPEN

6) Start selected MFV pump

7) Open MFV pump discharge valve

8) Open MFV flow control bypass valves as necessary to restore S/G level

e. Go to Step 10

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EOP: TITLE:

REV: 10 FR-H.l RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 8 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 6 Establish SAFW Flow:

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

1) Align SAFV system for established, THEN go to Step 7.

operation (Refer to Attachment SAFV)

2) Start both SAPV pumps

3) Verify SAPV total flow-GREATER THAN 200 GPM

b. Go to Step 10 CAUTION IF VIDE RANGE LEVEL IN BOTH S/GS DECREASES TO LESS THAN 35 INCHES [100 INCHES ADVERSE CNMT] OR IP PRZR PRESSURE INCREASES TO GREATER THAN 2335 PSIG DUE TO LOSS OF HEAT SINK, THEN STEPS 12 THROUGH 14 SHOULD BE IMMEDIATELY INITIATED POR BLEED AND FEED.

7 Check Condensate Pumps ANY IF offsite power available, THEN RUNNING r manually start at least one condensate pump. IF a condensate pump can NOT be started, THEN go to Step 11.

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EOP: TITLE: REV 10 FR-H.1 RESPONSE TO LOSS"'OF SECONDARY HEAT SINK PAGE 9 of 26 STEP ACTION/EXPECTED RESPONSE'ESPONSE NOT OBTAINED 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 9.

'o Annunciator G-15, STEAM DUMP

- LIT

b. Adjust condenser steam dump controller HC-484 to desired pressure and verify in AUTO

c. Place steam dump mode selector svitch to MANUAL

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EOP: TITLE: REV: 10 FR-H.l 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.

9 Try To Establish Feed Flow From Condensate System:

a. Establish condensate flowpath a. Go to Step 11.

(Refer to Attachment COND TO S/G)

b. Depressurize RCS to less than 1950 psig:

1) Deenergize PRZR heaters

2) Check letdown - IN SERVICE 2) Use one PRZR PORV. IF IA NOT available, THEN refer to Attachment N2 PORVS.

IF PORV NOT'available, THEN use auxiliary spray valve, AOV-296 and go to Step 9c.

3) Depressurize using auxiliary spray valve (AOV-296)

c. WHEN RCS pressure less than 1950 psig, THEN perform the following:

1) Block SI

2) Dump steam to condenser at 2) Manually or locally dump maximum rate to depressurize steam using intact S/G ARV.

at least one S/G to less than 380 psig

d. Verify condensate flow to S/Gs d. Go to Step 11.

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EOP:

REV 10 FR-H.1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 11 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 10 Check S/G Levels:

a. Narrow range level in at least a. IF feed flow verified,to at one S/G - GREATER THAN 5% [25% least one S/G, THEN maintain adverse CNMT] flow to restore narrow range level greater than 5% [25%

adverse CNMT]. IF NOT verified, THEN go to Step 11.

b. Return to procedure and step in effect 11 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 12 to initiate 2335 PSIG bleed and feed cooling.

b. Return to Step 1

• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • CAUTION STEPS 12 THROUGH 14 MUST BE PERFORMED QUICKLY IN ORDER TO ESTABLISH RCS HEAT REMOVAL BY RCS BLEED AND FEED.

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12 Actuate SI and CI

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EOP: TITLE: REV: 10 FR-H.1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 12 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED CAUTION WHEN BAST LEVEL DECREASES TO 10X, THEN SI PUMP AUTOMATIC SWITCHOVER TO RWST SHOULD BE ENSURED.

13 Vex'ify RCS Feed Path: Manually start pumps and align valves as necessary to establish

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

RUNNING IP 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.

14 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 XP 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 overpressurization c.'P BOTH PRZR PORVs can NOT be nitrogen system to open both opened, THEN perform the PRZR PORVs (Refer to Attachment following:

N2 PORVS)

1) Ensure both PORV switches in OPEN.

2) Go to Step 15.

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EOPD TITLE:

REV 10 FR-H.1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 13 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED CAUTION IF OFFSITE POWER IS LOST AFTER SI RESET, SELECTED SW PUMPS AND ONE CCV PUMP VILL AUTO START ON EMERGENCY D/G. MANUAL ACTION VILL BE REQUIRED TO RESTART SAFEGUARDS EQUIPMENT.

15 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 16.

1750 PSIG IF PRZR pressure decreasing,

-OR- THEN perform the following:

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

2) Go to Step 16.

b. Reset SI 16 Reset CI:

a. Depress CI reset pushbutton

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

CONTAINMENT ISOLATION-EXTINGUISHED 1) Reset SI.

2) Depress CZ reset pushbuttou

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EOP TITLE:

REV: 10 FR-H.1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 14 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 17 Veri fy Adequate SW Flow:

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

IP less than two SW pumps can be operated, THEN go to Step 20.

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

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EOP: TITLE:

REV 10 FR-H. 1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 15 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 18 Establish IA to CNMT:

a. Verify non-safe'guards 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 lA supply: d. Perform the following:

o Pressure - GREATER THAN 1) Continue attempts to restore 6O PSIG IA (Refer to AP-IA.1, LOSS OF INSTRUMENT AIR).

o Pressure - STABLE OR INCREASING 2) Continue with Step 20. WHEN IA restored, THEN do Steps 18e, f and 19.

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

f. Verify IA to CNMT AOV-5392 - OPEN

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EOP: TITLE: REV: 10 FR-H.1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 16 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 19 Restore RCS Overpressurization Nitrogen 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 "lose temporarily until adequate IA pressure is restored in CNMT.

20 Verify Adequate RCS Bleed IR PRZR PORVs can NOT be opened, Path BOTH PRZR PORVS OPEN THEN perform the following:

a. Open Rx vessel head vents.

~ SOV-590 SOV-591

~ SOV-592

~ 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 the depressurized S/Gs.

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EOP: TITLE:

REV: 10 FR-H.1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 17 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED CAUTION THE RCS BLEED PATH MUST BE MAINTAINED EVEN IF RCS PRESSURE REMAINS GREATER THAN SI PUMP SHUTOFF HEAD.

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21 Maintain RCS Heat Removal:

o Maintain SI flow o Maintain both PRZR PORVs and block valves - OPEN 22 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

A EOP: TITLE REV 10 FR-H.1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 18 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 2F Cheek If Charging Flow Hae Been Established:

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

1) IR CCW flow is lost to any RCP thermal barrier OR any RCP fl 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 OX.

b. Align charging pump suction to b. IR 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

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EOP: TITLE REV: 10 FR-H.l RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 19 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED CAUTION o IF RWST LEVEL DECREASES TO LESS THAN 28X, 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.

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

~ AFW flow

~ Main FW flow

~ Standby AFW flow

~ Condensate flow 25 Check For Adequate Secondary Heat Sink:

a. Check narrow range level in at a. Return to Step 24.

least one S/G - GREATER THAN 5X

[25X adverse CNMT]

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

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EOP: TITLE REV: 10 FR-H.l RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 20 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.

C 26 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 24.

27 Check CCW Pumps ANY RUNNING Perform the following:

a. IF any RCP $ 1 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 1').

EOP: TiTLE:

REV: 10 FR-H.1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 21 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED CAUTION, IP RCS IS SOLID, THEN TERMINATION OF FEED AND BLEED MAY RESULT IN RAPID RCS PRESSURE INCREASE UNLESS RCS INFLOW AND OUTFLOW ARE CAREFULLY CONTROLLED.

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

a. Three SI pumps - RUNNING a. Go to Step 29.

b. RCS subcooli'ng based on core b. Check the folloving:

exit T/Cs - GREATER THAN 35'P

[90'F adverse CNMT] USING PIGURE 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 IP NOT, THEN go to Step"31.

c. Check PRZR level - GREATER THAN c. Do NOT stop SI pump. Go to 13X [40X adverse CNMT] Step 31.

d. Stop one SI pump

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EOP: TITLE:

REV: 10 FR-H.1 RESPONSE TO L'OSS OF SECONDARY HEAT SINK PAGE 22 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 29 Check If One Of Two SI Pumps Should Bq Stopped:

a. Two SI pumps - RUNNING a. Go to Step 30.

b. Determine required RCS subcooling from table:

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

ONE 115'F [190'P adverse CNMT]

TVO 105'F [180'F adverse CNMT]

THREE 100'F [175'P adverse CNMT]

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

exit T/Cs - GREATER THAN VALUE PROM TABLE ABOVE USING PIGURE 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'P using Figure MIN SUBCOOLING IF NOT, THEN go to Step 31.

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

[40X adverse CNMT] Step 31.

e. Stop one SI pump

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REV: 10 FR-H.1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 23 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 30 Check Be If Last Stopped:

SI Pump Should

a. One SI pump - RUNNING a. Go to Step 32.

b. Check the following: b. Go to Step 31.

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

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

[40X adverse CNMT] Step 31.

d. Stop running SI pump

e. Go to Step 32

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EOP: TITLE:

REV: 10 FR-H.1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 24 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED NOTE: After closing a PORV, lt may be necessary to wait for RCS pressure to increase to permit stopping SI pumps in Steps 28, 29 and 30.

31 Check PRZR PORV Stat;us:

a. PRZR PORVs - ANY OPEN a. Close any open Rx vessel head valves and go to 'ent appropriate plant procedure:

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

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

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

b. PRZR PORVs - BOTH OPEN b. IF PRZR level greater than 75%

(65% adverse CNMTJ, THEN perform the following:

1) Establish excess letdown as follows:

o Place AOV-312 to NORMAL.

o Ensure CCW pump running.

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

o Open exc'ess letdown isolation valve AOV-310.

o Slowly open HCV-123.

2) Stop all but one charging pump and decrease charging flow to as necessary to control-RCS pressure.

This Step continued on the next page.

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EOP: TITLE: REV 10 FR-H.1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 25 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED (Step 31 continued from previous page)

c. Close one open PRZR PORV c. Close PORV block 'valve.

IP block valve can NOT be closed, THEN go to appropriate plant procedure:

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

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

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

d. Return to Step 28

• • • • • • k **********************************

CAUTION IP RCS IS SOLED, CLOSURE OF PORVS WILL RESULT IN RAPID RCS PRESSURE INCREASE UNLESS RCS INPLOW AND OUTPLOW ARE CAREFULLY CONTROLLED.

'I 32 Check PRZR PORVs And Rx Close all PRZR PORVs and Rx vessel Vessel Head Vent Valves ALL head vent valves. IP any PRZR PORV CLOSED can NOT be closed, THEN manually close its block valve.

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EOP: TITLE: REV 10 FR-H.1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 26 of 26 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 33 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) 28X) THEN go to E-l, LOSS OF REACTOR OR SECONDARY COOLANT,

2) Pressure - STABLE OR Step l.

INCREASING

-OR-o IF RWST level less than 28X)

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

Step 1.

b. Stop RHR pumps and place in AUTO 34 Start Charging Pumps As Necessary And Control Charging Flow To Maintain PRZR Level 35 Go To ES-1.1) SI TERMINATION)

Step 8

-END-

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EOP: TITLE: REV: 10 FR-H.1 RESPONSE TO LOSS OF SECONDARY HEAT SINK PAGE 1 of 1 FR-H.1 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

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EOP: TITLE REV 10 FR-H.l 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 INCREMENTS 20 PSIG 2200 2100 2000 1900 1800 1700

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1600 1400 SUBCOOLED 1300 REGION 1200 1100 1000 900 800 INADEQUATE 700 SUBCOOLING 600 REGION ADVERSE CNMT 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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