ML17262A893
| ML17262A893 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| 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:
ES-3.2 POST-SGTR COOLDOWN USING BLOWDOWN REV:
6 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:
r 9206160404 920605 PDR ADOCK 05000244 P
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EOP:
ES-3.2 POST-SGTR COOLDOWN USING BLOWDONN REV:
6 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:
ES-3 '
TITLE:
POST-SGTR COOLDOWN USING BLOWDOWN REV:
6 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 If SI ACCUMs Should Be Isolated:
a.
Check the following:
o RCS subcooling based o'n core exit T/Cs
- GREATER THAN O' USING FIGURE MIN SUBCOOLING a.
Go to ECA-3.1, SGTR WITH LOSS OF REACTOR COOLANT -
SUBCOOLED RECOVERY DESIRED, Step"1.
o PRZR level GREATER THAN 5%
[30% adverse CNMT]
~ MOV-841, MCC C position 12F
~ MOV-865, MCC D position 12C
- c. Close SI ACCUM outlet valves
~ ACCUM A, MOV-841
~ ACCUM B, MOV-865
- c. Vent any unisolated ACCUMs:
\\
- 1) Open vent valves for unisolated SI ACCUMs.
~ ACCUM A, AOV-834A
~ ACCUM B, AOV-834B
- d. Locally reopen breakers for MOV-841 and MOV-865
- 2) Open HCV-945.
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EOP:
ES-3. 2 TITLE:
POST-SGTR COOLDOWN USING BLO+DOgN REV:
6 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
- b. Borate as necessary.
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 THAN 58
[258 adverse CNMT]
- b. Control feed flow to maintain narrow range level between 178
[258 adverse CNMT) and 508
- a. Maintain total feed flow greater than 200 gpm until narrow range
~level greater than 58
[258 adverse CNMT) in intact S/G.
- b. IF narrow range level in the
'intact S/G continues to increase 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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TITLE:
POST-SGTR COOLDOWN USING BLOWDOWN REV 6
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 intact S/G
- b. Manually or locally dump steam 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:
ES-3.2 TITLE%
POST-SGTR COOLDOWN USZNG BLOgDOgg REV 6
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 LEVEL RUPTURED S/G NARROW RANGE LEVEL INCREASING DECREASING OFFSCALE HIGH LESS THAN 13%
[40% ADVERSE CNMT]
o Increase RCS makeup flow o Depressurize RCS using Step 6b.
Increase RCS o Increase RCS makeup flow makeup flow o Maintain RCS and ruptured S/G pressure equal BETWEEN 13%
[40% ADVERSE CNMT]
AND 50%
Depressurize RCS using Step 6b.
Energize PRZR heaters Maintain RCS and ruptured S/G pressure equal BETWEEN 50%
AND 75%
o Depressurize
[65% ADVERSE CNMT]
RCS using Step 6b.
o Decrease RCS makeup flow Energize PRZR heaters Maintain RCS and ruptured S/G pressure equal GREATER THAN 75%
[65% ADVERSE CNMT]
o Decrease RCS make'up flow Energize PRZR heaters Maintain RCS and ruptured S/G pressure equal b.
Use normal PRZR spray to obtain desired results for Step 6a
- b. IF letdown is in service,
.THEN use auxiliary spray (AOV-296).
IF NOT, THEN use one PRZR PORV.
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EOP:
ES-3 '
TITLE:
POST-SGTR COOLDOWN USING BLOWDOWN REV:
6 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 If RCS Cooldown Should Be Stopped:
a.
RCS cold leg temperatures LESS
- a. Return to Step 3.
THAN 350'F
- b. Stop RCS cooldown 9
Check Ruptured S/G Narrow Range Level GREATER THAN 17%
[25% adverse CNMT]
Refill ruptured S/G to 67%
[55%
adverse CNMT] using feed flow.
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 Appropriate Procedure To Establish Blowdown From Ruptured S/G IF blowdown can NOT be initiated, THEN go to alternate post-SGTR cooldown procedure, ES-3.1, POST-SGTR COOLDOWN USING BACKFILL, Step 1,
POST-SGTR COOLDOWN USING STEAM DUMP, Step 1.
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EOP:
ES-3.2 POST-SGTR COOLDOWN USING PLOgDOgg REV:
6 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$
[40% adverse CNMT]
b.
PRZR level - LESS THAN 75%
[65%
adverse CNMT)
- a. Increase RCS makeup flow as necessary and go to Step 12.
- b. Decreases RCS makeup flow to 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 spray
- a. IF letdown is in service, THEN 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: ES-3 ' TITLE: POST-SGTR COOLDOWN USING BLOWDOWN REV 6 PAGE 1 of 1 BORON CONCENTRATION (PPM) 1800 FIGURE SDM 1600 BORON INCREMENTS 20 PPM 1400 1200 1000 ADEQUATE SDM 100 PPH CONSERVATISH INCLUDED 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 J4kl ~ s 'I +a ~(1 EOP: ES-3.2 TITLE: POST-SGTR COOLDOWN USING BLOWDOWN REV: 6 PAGE 1 of 1 1. SI REINITIATION CRITERIA FOLDOUT PAGE 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 2 ~ o PRZR level CHARGING CAN NOT CONTROL LEVEL GREATER THAN 54 [30% adverse CNMT] 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 4 ~ IF RWST level decreases to less than 284, THEN go to ES-1.3, TRANSFER TO COLD LEG RECIRCULATION, Step 1. 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).