ML17262A893

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Rev 6 to EOP ES-3.2, Post-SGTR Cooldown Using Blowdown.
ML17262A893
Person / Time
Site: Ginna Constellation icon.png
Issue date: 05/06/1992
From:
ROCHESTER GAS & ELECTRIC CORP.
To:
Shared Package
ML17262A884 List:
References
ES-3.2, NUDOCS 9206160404
Download: ML17262A893 (30)


Text

EOP:

REV: 6 ES-3.2 POST-SGTR COOLDOWN USING BLOWDOWN PAGE 1 of 10 ROCHESTER GAS AND ELECTRIC CORPORATION GINNA STATION CONTROLLED COPY NUMBER TECHNICAL REVIEW PORC REVIEW DATE

( 8io PLANT SUPERINTENDENT EF EC VE DATE CATEGORY 1.0 REVIEWED BY:

9206160404 920605 r PDR ADOCK 05000244 P PDR

T EOP:

REV: 6 ES-3.2 POST-SGTR COOLDOWN USING BLOWDONN PAGE 2 of 10 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 via S/G blowdown.

B. ENTRY CONDITIONS/SYMPTOMS

1. ENTRY CONDITIONS This procedure is entered from:
a. E-3 STEAM GENERATOR TUBE RUPTURE, if plant staff selects the blowdown method.

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EOP: TITLE:

REV: 6 ES-3 ' POST-SGTR COOLDOWN USING BLOWDOWN PAGE 3 of 10 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED NOTE: o FOLDOUT page should be open AND monitored periodically.

o 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 o'n 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: 6 ES-3. 2 POST-SGTR COOLDOWN USING BLO+DOgN PAGE 4 of 10 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 58 [258 adverse CNMT] than 200 gpm until narrow range

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level greater than 58 [258 adverse CNMT) in intact S/G.

b. Control feed flow to maintain b. IF narrow range level in the narrow range level between 178 'intact S/G continues to increase

[258 adverse CNMT) and 508 in an uncontrolled manner, THEN go to ECA-3.1, SGTR WITH LOSS OF REACTOR COOLANT - SUBCOOLED RECOVERY DESIRED, Step l.

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EOP TITLE:

REV 6 ES-3 ' POST-SGTR COOLDOWN USING BLOWDOWN PAGE 5 of 10 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 350'F:

a. Establish and maintain cooldown rate in RCS cold legs - LESS THAN 100'F/HR
b. Dump steam to condenser from b. Manually or locally dump steam intact S/G from intact S/G using S/G ARV.

IF no intact S/G available, THEN perform the following:

o Use faulted S/G.

-OR-o Go to ECA-3.1, SGTR WITH LOSS OF REACTOR COOLANT SUBCOOLED RECOVERY DESIREDI Step l.

1 EOP: TITLE%

REV 6 ES-3.2 POST-SGTR COOLDOWN USZNG BLOgDOgg PAGE 6 of 10 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED CAUTION RCS AND RUPTURED S/G PRESSURES MUST BE MAINTAINED LESS THAN 1050 PSIG.

6 Control RCS Pressure And Makeup Flow To Minimize RCS-To-Secondary Leakage:

a. Perform appropriate action(s) from table:

PRZR RUPTURED S/G NARROW RANGE LEVEL LEVEL INCREASING DECREASING OFFSCALE HIGH LESS THAN 13% o Increase RCS Increase RCS o Increase RCS

[40% ADVERSE CNMT] makeup flow makeup flow makeup flow o Depressurize o Maintain RCS RCS using and ruptured Step 6b. S/G pressure equal BETWEEN 13% Depressurize Energize Maintain RCS

[40% ADVERSE CNMT] RCS using PRZR and ruptured AND 50% Step 6b. heaters S/G pressure equal BETWEEN 50% AND 75% o Depressurize Energize Maintain RCS

[65% ADVERSE CNMT] RCS using PRZR and ruptured Step 6b. heaters S/G pressure equal o Decrease RCS makeup flow GREATER THAN 75% o Decrease RCS Energize Maintain RCS

[65% ADVERSE CNMT] make'up flow PRZR and ruptured heaters S/G pressure equal

b. Use normal PRZR spray to obtain b. IF letdown is in service, .THEN desired results for Step 6a use auxiliary spray (AOV-296).

IF NOT, THEN use one PRZR PORV.

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EOP: TITLE:

REV: 6 ES-3 ' POST-SGTR COOLDOWN USING BLOWDOWN PAGE 7 of 10 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 7 Establish Required RCS Hydrogen Concentration (Refer to S-3.3C, H2 OR 02 REMOVAL FROM PRIMARY SYSTEM BY BURPING VCT) 8 Check Be If RCS Stopped:

Cooldown Should

a. RCS cold leg temperatures - LESS . a. Return to Step 3.

THAN 350'F

b. Stop RCS cooldown 9 Check Ruptured S/G Narrow Refill ruptured S/G to 67% [55%

Range Level GREATER THAN adverse CNMT] using feed flow.

17% [25% 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.

NOTE: Blowdown from ruptured S/G may be stopped when RHR system is placed in service.

10 Consult TSC To Determine IF blowdown can NOT be initiated, Appropriate Procedure To THEN go to alternate post-SGTR Establish Blowdown From cooldown procedure, ES-3.1, Ruptured S/G Step 1, OR ES-3 ',

POST-SGTR COOLDOWN USING BACKFILL, POST-SGTR COOLDOWN USING STEAM DUMP, Step 1.

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EOP:

REV: 6 ES-3.2 POST-SGTR COOLDOWN USING PLOgDOgg PAGE 8 of 10 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 11 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 12.

b. PRZR level - LESS THAN 75% [65% b. Decreases RCS makeup flow to adverse CNMT) decrease level and go to Step 13.

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

12 Depressurize RCS To Minimize RCS-To-Secondary Leakage:

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. Energize PRZR heaters as necessary cd Maintain RCS pressure at ruptured S/G pressure
d. Maintain RCS subcooling based on core exit T/Cs - GREATER THAN O'F USING FIGURE MIN SUBCOOLING

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P EOP: TITLE: REV 6 ES-3 ' POST-SGTR COOLDOWN USING BLOWDOWN PAGE 1 of 1 FIGURE SDM BORON CONCENTRATION (PPM) 1800 BORON INCREMENTS 20 PPM 1600 1400 ADEQUATE SDM 1200 100 PPH CONSERVATISH INCLUDED 1000 800 600 400 200 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. ~ I@I J4 kl ~s 'I +a ~(1 EOP: TITLE: REV: 6 ES-3.2 POST-SGTR COOLDOWN USING BLOWDOWN 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 54 [30% 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).