ML17262A892

Rev 5 to EOP ES-3.1, Post-SGTR Cooldown Using Backfill.

ML17262A892
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-3.1, NUDOCS 9206160403
Download: ML17262A892 (26)

Text

EOP:

REV: 5 ES-3 ' POST-SGTR COOLDOWN USING BACKFILL PAGE 1 of 8 ROCHESTER GAS AND ELECTRIC CORPORATION GINNA STATION CONTROLLED COPY NUMBER D3 TECHNICAL REVIEW PORC REVIEW DATE PLANT SUPERINTENDENT EF EC IVE DATE CATEGORY 1.0 REVIEWED BY:-

9206Lb0403 920b05 PDR ADOCK 05000244 P PDR

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EOP: TITLE:

REVS 5 ES-3 ' POST-SGTR COOLDOWN USING BACKFILL PAGE 2 of 8 A. PURPOSE This procedure provides actions to cool down and depressurize the plant to cold shutdown conditions following a SGTR. This recovery method depressurizes the ruptured S/G by draining it through the ruptured S/G tubes into the RCS.

B. ENTRY CONDITIONS/SYMPTOMS

1. ENTRY CONDITIONS This procedure is entered from:

a. E-3 STEAM GENERATOR TUBE RUPTURE, staff selects backfill method.

if plant b ~ I ES 3 ~ 2 / POST SGTR COOLDOWN US NG BLOWDOWNg when blowdown is not available and plant staff selects backfill method.

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EOP:

REV: 5 ES-3. 1 POST-SGTR COOLDOWN USING BACKFILL PAGE 3 of 8 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED NOTE: o FOLDOUT page should be open AND monitored periodically.

Adverse CNMT values should be used whenever CNMT pressure is greater than 4 psig or CNMT radiation is greater than 10+ R/hr.

1 Energize PRZR Heaters As Necessary To Saturate PRZR Water At Ruptured S/G Pressure 2 Check Isolated:

If SI ACCUMs Should Be

a. Check the following: a. Go to ECA-3.1, SGTR WITH LOSS OF REACTOR COOLANT - SUBCOOLED o RCS subcooling based on core RECOVERY DESIRED, Step 1.

exit T/Cs - GREATER THAN O' USING FIGURE MIN SUBCOOLING o PRZR level - GREATER THAN 5%

[30% adverse CNMT]

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 outlet valves c. Vent any unisolated ACCUMs:

~ ACCUM A, MOV-841 1) Open vent valves for

~ ACCUM B) MOV-865 unisolated SI ACCUMs.

~ ACCUM A, AOV-834A

~ ACCUM B, AOV-834B

2) Open HCV-945.

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

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EOP: TITLE:

REV: 5 ES-3.1 POST-SGTR COOLDOWN USING BACKFILL PAGE 4 of 8 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED NOTE: Leakage from ruptured S/G into RCS will dilute RCS boron concentration.

3 Verify Adequate Shutdown Margin

a. Direct HP to sample RCS and ruptured S/G for boron concentration

b. Verify boron concentration- b. Borate as necessary.

GREATER THAN REQUIREMENTS OF FIGURE SDM 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).

NOTE: TDAFW pump flow control valves fail open on loss of IA.

4 Check Intact S/G Level:

a. Narrow range level - GREATER a. Maintain total feed flow greater THAN 5% [25% adverse CNMT) than 200 gpm until narrow range I

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level greater than 5% [25%

adverse CNMT] in the intact S/G.

b. Control feed 'flow to maintain b. IF narrow range level in the narrow range level between 17% intact S/G continues to increase

[25% adverse CNMT] and 50% in an uncontrolled manner, THEN go to ECA-3.1, SGTR WITH LOSS OF REACTOR COOLANT - SUBCOOLED RECOVERY DESIRED, Step 1.

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EOP: TITLE:

REV: 5 ES-3 ~ 1 POST-SGTR COOLDOWN USING BACKFILL PAGE 5 of 8 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED NOTE: Since ruptured S/G may continue to depressurize to less than the minimum RCS pressure necessary for continued RCP operation, cooldown to cold shutdown should be completed as quickly as possible, not to exceed 100'F/hr.

5 Initiate RCS Cooldown To Cold Shutdown:

a. Establish and maintain cooldown rate in RCS cold legs - LESS THAN 100'F/HR

b. Use RHR system if in service

c. Dump steam to condenser from c. Manually or locally dump steam intact S/G using intact S/G ARV.

IF no intact S/G available and RHR system NOT in service, THEN perform the following:

o Use faulted S/G.

-OR-o Go to ECA-3.1, SGTR WITH LOSS I'efill OF REACTOR COOLANT SUBCOOLED RECOVERY DESIRED, Step 1.

6 Check Ruptured S/G Narrow ruptured S/G to 67% [55%

Range Level GREATER THAN adverse CNMT) using feed flow.

174 [254 adverse CNMT]

IF either of the following conditions occurs, THEN stop feed flow to ruptured S/G:

o Ruptured S/G pressure decreases in an uncontrolled manner.

-OR-o Ruptured S/G pressure increases to 1020 psig.

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EOP:

REV: 5 ES-3 ' POST-SGTR COOLDOWN USING BACKFILL PAGE 6 of 8 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 7 Control RCS Makeup Flow And Letdown To Maintain PRZR Level:

a. PRZR level - GREATER THAN 13% a, Increase RCS makeup flow as

[40$ adverse CNMT] necessary and go to Step 8.

b. PRZR level - LESS THAN 75% [65% b. Decrease RCS makeup flow to adverse CNMT] decrease level and go to Step 10.

NOTE: The upper head region may void during RCS depressurization if RCPs are not running. This may result in a rapidly increasing PRZR level.

8 Depressurize RCS To Backfill From Ruptured S/G:

a. Depressurize using normal PRZR a. IF letdown is in service, THEN spray depressurize using auxiliary spray valve (AOV-296). IF NOT, THEN use one PRZR PORV ~

b. Maintain PRZR level - BETWEEN 13% AND 75% [BETWEEN 40% AND 65%

adverse CNMT]

c. Check ruptured S/G level c. Stop RCS depressurization.

GREATER THAN 5% [25% adverse CNMT]

d. Energize PRZR heaters as necessary

e. Maintain RCS subcooling based on core exit T/Cs - GREATER THAN O'F USING FIGURE MIN SUBCOOLING

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EOP:

REV: 5 ES-3 ~ 1 POST-SGTR COOLDOWN USING BACKFILL PAGE 7 of 8 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 9 Establish Required RCS Hydrogen Concentration (Refer to S-3.3C, H2 Or 02 REMOVAL FROM PRIMARY SYSTEM BY BURPING VCT) 10 Check Can Be IfEstablished:

RHR Normal Cooling

a. RCS cold leg temperature - LESS a. Go to Step 11.

THAN 350'F

b. RCS pressure - LESS THAN b.'o to Step 11.

400 psig [300 psig adverse CNMT]

c. Place RCS overpressure c. IF RCS overpressure protection protection system in service system can NOT be placed in (Refer to 0-7, ALIGNMENT AND service, THEN notify TSC of OPERATION OF THE REACTOR VESSEL potential Tech Spec violation if OVERPRESSURE PROTECTION SYSTEM) RHR system is placed in service.

d. Establish RHR normal cooling (Refer to Attachment RHR COOL) ll Check If RCPs Must Be Stopped:

a. RCPs - ANY RUNNING "

a. Go to Step 12.

b. Check the following: b. Go to Step 12.

o RCP ¹1 seal D/P - LESS THAN 220 PSID

-OR-o Check RCP seal leakage - LESS THAN 0.25 GPM

c. Stop affected RCP(s)

EOP:

REV' ES;3 1 ~ POST-SGTR COOLDOHN USING BACKFILL PAGE 8 of 8 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 12 Check Core Exit T/Cs LESS Return to Step 3.

THAN 200'F 13 Evaluate Long Term Plant Status:

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

b. Consult TSC

-END-

EOP:

REV: 5 ES-3 ' POST-SGTR COOLDOWN USING BACKFILL PAGE 1 of 1 ES-3. 1 APPENDIX LIST TITLE PAGES

1) RED PATH

SUMMARY

2) FIGURE MIN SUBCOOLING

3) FIGURE SDM

4) ATTACHMENT RHR COOL

5) FOLDOUT

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EOP:

REV: 5 ES-3.1 POST-SGTR COOLDOWN USING BACKFILL PAGE 1 of 1 RED PATH

SUMMARY

a. SUBCRITICALITY Nuclear power greater than 5%

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 43% [46%

adverse CNMT)

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

[25% 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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EDP: TITLE:

REV' ES-3 ' POST-SGTR COOLDOWN USING BACKFILL 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 2300 RCS PRESSURE INCREMENTS 20 PSIG 2200 2100 2000 1900 1800 1700 1600 1500 1400 SUBCOOLED 1300 REGION 1200 1100 1000 900 800 700 INADE(UATE SUBCOOLING 600 REGION DV RSE CNMT 500 400 300 200 NORMAL CNMT TEMPERATURE INCREMENTS 10'F 100 0

200 250 300, 350 400 450 500 550 600 650'00 CORE EXIT SATURATION TEMPERATURE ('F)

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EOP: TITLE:

REV: 5 ES-3.1 POST-SGTR COOLDOWN USING BACKFILL PAGE 1 of 1 FIGURE SDM BORON CONCENTRATION (PPH) 1800 BORON INCREMENTS 20 PPH 1600 1400 ADEQUATE SDH 1200 100 PPH CONSERVATISH INCLUDED 1000 SOO 600 400 BO 200 BURNUP INCREMENTS 100 HWD/HTU 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 CYCLE 22 BURNUP (MWD/HTU)

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

EOP: T1TLE:

REV: 5 ES-3 ' POST-SGTR COOLDOWN USING BACKFILL PAGE 1 of 1 FOLDOUT PAGE 1~ SI REINITIATION CRITERIA IF either condition listed below occurs, THEN operate SI pumps manually as necessary and go to ECA-3.1, SGTR WITH LOSS OF REACTOR COOLANT SUBCOOLED RECOVERY DESIRED, 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%

[304 adverse CNMT]

2 ~ SECONDARY INTEGRITY CRITERIA IF any S/G pressure is decreasing in an uncontrolled manner or is completely depressurized AND has not been isolated, THEN go to E-2, FAULTED S/G ISOLATION, Step 1.

3 ~ COLD LEG RECIRCULATION SWITCHOVER CRITERION IF RWST level decreases to less than 284, THEN go to ES-1.3, TRANSFER TO COLD LEG RECIRCULATION, Step 1.

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.l, ALTERNATE WATER SUPPLY TO AFW PUMPS).

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