ML17250B120
| ML17250B120 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 04/09/1990 |
| From: | Widay J ROCHESTER GAS & ELECTRIC CORP. |
| To: | |
| Shared Package | |
| ML17250B096 | List:
|
| References | |
| ES-3.2, NUDOCS 9004200717 | |
| Download: ML17250B120 (30) | |
Text
EOP:
ES-3.2 TITLE:
POST-SGTR COOLDOWN USING BLOWDOWN REV 4
PAGE 1 of 10 ROCHESTER GAS AND ELECTRIC CORPORATION GINNA STATION CONTROLLED COPY NUMBER TECHNICAL REVIEW PORC REVIEW DATE NT SUPER NT NDENT Q//
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QA NON-QA CATEGORY 1-.0 REVIEWED BY:
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ES-3. 2 POST-SGTR COOLDOWN USING BLOWDOWN REV 4
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 l.
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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ES-3.2 POST-SGTR COOLDOWN USING BLOWDOWN REV 4
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 radi'ation 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 on 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
- d. Locally reopen breakers for MOV-841 and MOV-865
- c. Vent any unisolated ACCUMs:
- 1) Open vent valves for unisolated SI ACCUMs.
~ ACCUM A, AOV-834A
~ ACCUM B, AOV-834B
- 2) Open HCV-945.
0
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ES-3.2 TITLE:
POST-SGTR COOLDOWN USING BLOWDOWN REV 4
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 IP CST LEVEL DECREASES TO LESS THAN 5 FEET, THEN ALTERNATE WATER SOURCES POR APW PUMPS WILL BE NECESSARY (REFER TO ER-APW.l, ALTERNATE WATER SUPPLY TO AFW PUMPS).
I NOTE:
TDAFW pump flow control valves fail open on loss of IA.
4 Check Intact S/G Level:
- a. Narrow range level - GREATER THAN 5X [25X adverse CNMT]
- b. Control feed flow to maintain narrow range level between 17X
[25X adverse CNMT] and 50X
- a. Maintain total feed flow greater than 200 gpm until narrow range level greater than 5X [25X adverse CNMT] in intact S/G.
- b. IP 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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ES-3.2 TITLE:
POST-SGTR COOLDOWN USING BLOWDOWN REV 4
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 VITH LOSS OF REACTOR COOLANT-SUBCOOLED RECOVERY DESIRED, Step l.
1
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ES-3.2 TITLE:
POST-SGTR COOLDOWN USING BLOWDOWN REV 4
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 NARROV'ANGE LEVEL LESS THAN 13X
[40X ADVERSE CNMT]
BETWEEN 13X
[40X ADVERSE CNMT]
AND 50X BETVEEN 50X AND 75X
[65X ADVERSE CNMT]
INCREASING o Increase RCS makeup flow o Depressurize RCS using Step 6b.
Depressurize RCS using Step 6b.
o Depressurize RCS using Step 6b.
o Decrease RCS makeup flow DECREASING Increase RCS makeup flow Energize PRZR heaters Energize PRZR heaters OFFSCALE HIGH o Increase RCS makeup flow o Maintain RCS and ruptured S/G pressure equal Maintain RCS and ruptured S/G pressure equal Maintain RCS and ruptured S/G pressure equal GREATER THAN 75X
[65% ADVERSE CNMT]
o Decrease RCS Energize makeup flow 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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ES-3.2 TITLE:
POST-SGTR COOLDOWN USING BLOWDOWN REV 4
PAGE 7 of 10 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 7
Establish Required RCS Hydrogen Concentration (Refer to S
3
~ 3 C i H2 OR 02 REMOVAL FROM PRIMARY SYSTEM BY BURPING VCT) 8 Check If-RCS Cooldown Should Be Stopped:
a.
RCS cold leg temperatures
- LESS THAN 350'P
- a. Return to Step 3.
- b. Stop RCS cooldown 9
Check Ruptured S/G Narrow Range Level GREATER THAN 17~ [254 adverse CNMT]
Refill ruptured S/G to 67X [55X adverse CNMT] using feed flow.
IP 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-NOTE:
o Ruptured S/G pressure increases to 1020 psig.
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 IP blowdown can NOT be initiated, THEN go to alternate post-SGTR cooldown procedure, ES-3.1, POST-SGTR COOLDOWN USING BACKPILL, Step 1,
OR ES-3.3, POST-SGTR COOLDOVN USING STEAM DUMP, Step 1.
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ES-3.2 POST-SGTR COOLDOWN USING BLOWDOWN REV 4
PAGE 8 of 10 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED ll Control RCS Makeup Flow And Letdown To Maintain PRZR Level:
a.
PRZR level - GREATER THAN 13X
[40% adverse CNMT) b.
PRZR level -
LESS THAN 75X [65X 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'o Minimize RCS-To-Secondary Leakage:
- a. Depressurize using normal PRZR spray
- b. Energize PRZR heaters as necessary
- c. Maintain RCS pressure at ruptured S/G pressure
- d. Maintain RCS subcooling based on core exit T/Cs - GREATER THAN O'R USING RIGURE MIN SUBCOOLING
- a. IR letdown is in service, THEN depressurize using auxiliary spray valve (AOV-296).
IR NOT, THEN use one PRZR PORV.
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ES-3.2 TITLE POST-SGTR COOLDOWN USING BLOWDOWN REV:
4 PAGE 9 of 10 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 13 Check If RCPs Must Be Stopped:
a.
RCPs - ANY RUNNING b.
Check the following:
o RCP fl seal D/P - LESS THAN 220 PSID a.
Go to Step 14.
b.
Go to Step 14.
-OR-o Check RCP seal leakage
- LESS THAN 0.25 GPM
a.
RCS cold leg temperature
- LESS THAN 350'F
- a. Return to Step 9.
b.
RCS pressure
- LESS THAN
- b. Return to Step 9.
400 psig (300 psig adverse CNMT]
- c. Place RCS overpressure protection system in service (Refer to 0-'7, ALIGNMENT AND OPERATION OF THE REACTOR VESSEL OVERPRESSURE PROTECTION SYSTEM)
- c. IF RCS overpressure protection system can NOT be placed in
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ES-3.2 TITLE:
POST-SGTR COOLDOWN USING BLOWDOWN REV 4
PAGE 10 of 10 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 15 Continue RCS Cooldown To Cold Shutdown:
- a. Maintain cooldovn rate in RCS cold legs
- LESS THAN 100'F/HR b.
Use RHR System c.
Dump steam to condenser from intact S/G
- c. Manually or locally dump steam using intact S/G ARV.
IF no intact S/G available and RHR system NOT in service, THEN perform the folloving:
o Use faulted S/G.
-OR-o Go to ECA-3.1, SGTR WITH LOSS OF REACTOR COOLANT-SUBCOOLED RECOVERY DESIRED, Step 1.
16 Check Core Exit T/Cs LESS THAN 200'F Return to Step 9.
17 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-
~ a N
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ES-3.2 POST-SGTR COOLDOWN USING BLOWDOWN REV:
4 PAGE 1 of 1 ES-3.2 APPENDIX LIST TITLE 1)
RED PATH
SUMMARY
2)
FIGURE MIN SUBCOOLING 3)
FIGURE SDM 4)
ATTACHMENT RHR COOL 5)
FOLDOUT PAGES
ES-3.2 POST-SGTR COOLDOWN USING BLOWDOWN REV 4
PAGE 1 of 1 RED PATH
SUMMARY
a.
SUBCRITICALITY Nuclear power greater than 54 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 434
[464 adverse CNMT]
c.
HEAT SINK Narrow range level in all S/Gs less than 54
[254 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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ES-3.2 TITLE:
POST-SGTR COOLDOWN USING BLOWDOWN REV 4
PAGE 1 of 1 FIGURE MIN SUBCOOLING NOTE:
Subcooling Margin = Saturation Temperature From Figure Below [-] Core Exit T/C Indication RC 2500 2400 2300 2200 2100 2000 1900 1800 1700 1600 1500 1400 1300 1200 1100 1000 900 800 700 600 500 400 300 200 100 0
S PRESSURE (PSIG)
RCS'PRESSURE INCREMENTS 20 PSIG SUBCOOLED REGION ADVERSE CNMT NORMAL CNMT INADEQUATE SUBCOOLING REGION TEMPERATURE INCREMENTS 10'F 200 250 300 350 400 450 500 550 600 650 700 CORE EXIT SATURATION TEMPERATURE ('F)
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ES-3 '
TITLE:
POST-SGTR COOLDOWN USING BLOWDOWN REV 4
PAGE 1 of 1 FIGURE SDM BORON CONCENTRATION (PPM) 1800 1600 BORON INCREMENTS 20 PPM 1400 1200 ADEQUATE SDM 1000 80O 600 400 ORATE 200 BURNUP INCREMENTS 100 l6lD/MTU 0
1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 CYCLE BURNUP (MVD/MTU)
NOTE-To obtain core burnup, use PPCS turn on code BURNUP.
C'
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ES-3 '
TITLE:
POST-SGTR COOLDOWN USING BLOWDOWN REV' PAGE 1 of 1 FOLDOUT PAGE 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.
2 ~
OR o
PRZR level CHARGING CAN NOT CONTROL LEVEL GREATER THAN 54
[304 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.1, ALTERNATE WATER SUPPLY TO AFW PUMPS).