ML17250B115
| ML17250B115 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 04/09/1990 |
| From: | Widay J ROCHESTER GAS & ELECTRIC CORP. |
| To: | |
| Shared Package | |
| ML17250B096 | List:
|
| References | |
| ES-.2, ES-0.2, NUDOCS 9004200702 | |
| Download: ML17250B115 (42) | |
Text
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ES-0.2 TITLE:
NATURAL CIRCULATION COOLDOWN REV:
1 PAGE 1 of 14 ROCHESTER GAS AND ELECTRIC CORPORATION GINNA STATION CONTROLLED COPY NUMBER TECHNICAL REVIEW PORC REVIEW DATE T SUPER TE DENT
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ES-0.2 TITLE:
NATURAL CIRCULATION COOLDOWN REV 1
PAGE 2 of 14 A.
PURPOSE This procedure provides actions to perform a natural circulation RCS cooldown and depressurization to cold shutdown, with no accident in progress, under requirements that will preclude any upper head void formation.
B.
SYMPTOMS AND OR ENTRY CONDITIONS This procedure is entered from:
- 1) ES-O.l, REACTOR TRIP RESPONSE, when it has been determined that a natural circulation cooldown is required.
2 )
ECA 0 ~ 1 g LOSS OF ALL AC POWER RECOVERY WITHOUT SI REQUIRED /
when it has been determined that a natural circulation cooldown is required.
- 3) Other normal operating procedures when a natural circulation cooldown is required.
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ES-0.2 TITLE:
NATURAL CIRCULATION COOLDOWN REV:
1 PAGE 3 of 14 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED CAUTION IP SI ACTUATION OCCURS DURING THIS PROCEDURE, E-O, REACTOR TRIP OR SAFETY INJECTION, SHOULD BE PERFORMED.
NOTE:
o Foldout page should be open and monitored periodically.
o If conditions can be established for starting an RCP during this procedure, Step 1 should be repeated.
1 Try To Restart An RCP:
- a. Establish conditions for starting an RCP o
Bus llA or llB energized o
Refer to Attachment RCP START
- b. Start one RCP c.
Go to 0-2.2, PLANT SHUTDOWN PROM HOT SHUTDOWN TO COLD CONDITION a.
Go to Step 2.
Go to Step 2.
t
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ES-0 '
NATURAL CIRCULATION COOLDOWN REV 1
PAGE 4 of 14 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 2
Check VCT Makeup System:
- a. Verify the following:
- 1) Boric acid flow control valve SET FOR REQUIRED CSD CONCENTRATION 2)
RMW mode selector switch in AUTO 3)
RMW control armed - RED LIGHT LIT
- b. Check VCT level o
Level - GREATER THAN 20K
-OR-o Level - STABLE OR INCREASING
- b. Manually increase VCT makeup flow as follows:
- 1) Ensure BA transfer pumps and RMW pumps running.
- 2) Place RMW flow control valve HCV-ill in MANUAL and-increase RMW flow.
- 3) Increase boric acid flow as necessary.
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ES-0.2 IITLE:
NATURAL CIRCULATION COOLDOWN REV:
1 PAGE 5 of 14 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 3
Check Charging Pump Suction Aligned To, VCT:
a.
Check VCT level:
o Level - GREATER THAN 20%
o VCT makeup system
- AVAILABLE
- a. IP VCT level can NOT be maintained greater than 5%,
THEN perform the following:
- 1) Ensure charging pump suction aligned to RWST o
LCV-112B open o
LCV-112C closed
- b. Verify the following:
o LCV-112C -
OPEN o
LCV-112B - CLOSED
- 2) Continue with Step 4.
WHEN VCT level greater than 40%,
THEN do Step 3b.
- b. Manually align valves as necessary.
4 Borate RCS To Cold Shutdown Boron Concentration (Refer to Figure SDM) 5 Establish Maximum Rx Vessel Head Cooling:
o Check control rod shroud fans-BOTH RUNNING Start fans as necessary.
o Check one Rx compartment cooling fan - RUNNING
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ES-0.2 TITLE:
NATURAL CIRCULATION COOLDOWN REV 1
PAGE 6 of 14 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 6 Verify Adequate Shutdown Margin
- b. Perform the following:
- 2) Continue to borate as necessary.
CAUTION o
IP CST LEVEL DECREASES TO LESS THAN 5 FEET, THEN ALTERNATE WATER SOURCES FOR APV VILL BE NECESSARY (REFER TO ER-AFV.1, ALTERNATE VATER SUPPLY TO AFV PUMPS).
o SI MUST BE BLOCKED BEFORE S/G PRESSURE DECREASES TO 514 PSIG.
- * * * * * * * * * * * * * * * * * * * * * *
- 4 * * * * * * * * * * * * * * *
- 7 Initiate RCS Cooldown To Cold Shutdown:
a.
Dump steam to condenser
- b. Establish and maintain cooldown rate in RCS cold legs
- LESS THAN 25'P/HR
- a. Manually or locally dump steam using S/G ARVs.
- c. Maintain S/G narrow range level
- c. Control feed flow as necessary.
BETWEEN 17'ND 39)a
- d. Plot RCS cold leg temperatures and PRZR temperature twice per hour
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ES-0.2 TITLE:
NATURAL CIRCULATION COOLDOWN REV:
1 PAGE 7 of 14 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 8
Determine RCS Pressure And Temperature Limits:
a.
Check control rod shroud fans-BOTH RUNNING
- a. Perform the following:
- b. Maintain RCS pressure
- VITHIN LIMITS OF FIGURE NAT CIRC C/D WITH SHROUD PANS 2)
Go to Step 9.
CAUTION SI ACTUATION CIRCUITS 'VILL AUTOMATICALLYUNBLOCK IP PRZR PRESSURE INCREASES TO GREATER THAN 1992 PSIG.
9 Check If SI Should Be Blocked:
a.
Check the following:
o PRZR pressure
- LESS THAN 1950 PSIG
- a. Continue with Step 10.
VHEN either condition satisfied, THEN do Steps 9b and 9c.
-OR-o LOV PRZR PRESS BLOCK SAP INJEC status light - LIT
- b. Place SI block switch to BLOCK
- c. Verify SAFETY INJECTION BLOCKED status light - LIT
- c. Maintain PRZR pressure greater than 1750 psig and S/G pressure greater than 514 psig until SI blocked.
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ES-0 '
TITLE:
NATURAL CIRCULATION COOLDOWN REV:
1 PAGE 8 of 14 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED NOTE:
o If at'ny time it is determined that, a natural circulation cooldown and depressurization must be performed at a rate that may form a steam void in the vessel, then procedure ES-0.3, NATURAL CIRCULATION COOLDOWN WITH STEAM VOID IN VESSEL, should be used.
o If charging line to PRZR AT exceeds 320'F, then plant staff should be consulted before using auxiliary spray.
o If auxiliary spray is in use, spray flow may be increased by closing normal charging valve AOV-294 and normal PRZR spray valves.
10 Initiate RCS Depressurization:
a.
Check letdown - IN SERVICE
- b. Depressurize RCS using auxiliary spray valve (AOV-296)
- a. Try to establish letdown (Refer to Attachment LETDOWN).
IF letdown can NOT be established, THEN depressurize RCS using one PRZR PORV and go to Step 11.
I
- b. IF auxiliary spray valve NOT available, THEN use one PRZR PORV.
- c. Plot RCS temperature and pressure on curve selected in Step 8
ll Maintain PRZR Level Between 20% And 30<
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ES-0.2 NATURAL CIRCULATION COOLDOWN REV 1
PAGE 9 of 14 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 12 Monitor RCS Cooldown:
o Core exit T/Cs - DECREASING o
RCS hot leg temperatures-DECREASING o
RCS subcooling based on core exit T/Cs - INCREASING o
Cooldown rate in RCS cold legs-LESS THAN 25'F/HR 13 Establish Required RCS Hydrogen Concentration (Refer to S-3.3C, H2 OR 02 REMOVAL FROM PRIMARY SYSTEM BY BURPING VCT) 14 Check For Steam Void In Reactor Vessel:
o PRZR level -
NO UNEXPECTED LARGE ARIATIONS o
- GREATER THAN 95X Repressurize RCS within allowable limits and continue cooldown.
IF RCS depressurization must
- continue, THEN go to ES-0.3, NATURAL CIRCULATION COOLDOWN WITH STEAM VOID IN VESSEL.
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ES-0.2 TITLE:
NATURAL CIRCULATION COOLDOWN REV 1
PAGE 10 of 14 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 15 Check If SI ACCUMs Should Be Isolated:
a.
RCS pressure
- LESS THAN 1500 PSIG
~ MOV-841, MCC C position 12F
~ MOV-865, MCC D position 12C
- c. Close SI ACCUM discharge valves
~ ACCUM A, MOV-841
~ ACCUM B, MOV-865
- a. Continue with Step 16.
MHRN RCS pressure is less than 1500 psig, THEN do Step 15b.
- c. IF any valve can NOT be closed, THEN perform the following:
- 1) Dispatch personnel to locally close valves, as necessary.
IF any SI ACCUM can NOT be isolated AND RCS depressurization to less than 1000 psig is required, THEN:
- 1) Open vent valves for unisolated SI ACCUMs.
- d. Locally open breakers for MOV-841 and MOV-865
~ ACCUM A, AOV-834A
~ ACCUM B, AOV-834B
- 2) Open HCV-945.
I 'I
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ES-0.2 TITLE:
NATURAL CIRCULATION COOLDOWN REV 1
PAGE ll of 14 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 16 Check If SI System Normal Shutd'own Alignment Should Be Established:
- a. Verify the following:
o RCS cold leg temperatures-LESS THAN 350'R o
RCS pressure
- LESS THAN 1500 PSIG
- b. Lock out SI system as follows:
- 1) Place all SI pump switches in PULL STOP a.
Do NOT lock out SI system.
Continue with Step 17.
%HEN requirements
- met, THEN do Step 16b.
- 2) Locally close breakers for SI pump discharge valves to cold legs
~ MOV-878B, MCC C position 8C
~ MOV-878D, MCC D position 8R
- 3) Close SI pump discharge to cold legs
~ MOV-878B
~ MOV-878D
- 4) Locally open breakers for MOV-878B and MOV-878D 17 Maintain Letdown Flow:
a.
Open letdown orifice valves as necessary
- b. Adjust low pressure letdown control valve setpoint as necessary
0 0
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ES-0.2 TITLE:
NATURAL CIRCULATION COOLDOWN REV 1
PAGE 12 of 14 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 18 Maintain Required RCP Seal Injection Flow And Labyrinth
-Seal D/P:
o Labyrinth seal D/P to each RCP-GREATER THAN 15 INCHES OF VATER Perform the following:
o Adjust charging flow to REGEN Hx (HCV-142) as necessary.
-OR-o Seal injection flow to each RCP
- GREATER THAN 6 GPM o
Dispatch AO to ad)ust seal in)ection needle valves if necessary.
~ RCP A, V-300A
~ RCP B, V-300B 19 Check If RHR Normal Cooling Can Be Established:
a.
RCS cold leg temperature
- LESS THAN 350'F
- a. Return to Step 7.
b.
RCS pressure
- LESS THAN 400 PSIG
- b. Return to Step 7.
- 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
- service, THEN consult Plant staff to determine if RHR normal cooling should be established and go to Step 20.
20 Continue RCS Cooldown To Cold Shutdown
0 t
0
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ES-0.2 TITLE:
NATURAL CIRCULATION COOLDOWN REV 1
PAGE 13 of 14 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED CAUTION DEPRESSURIZING THE RCS BEFORE THE ENTIRE RCS IS LESS THAN 200'F MAY RESULT IN ADDITIONALVOID FORMATION IN THE RCS.
21 Continue Cooldown Of Inactive Portion Of RCS:
- a. Cool upper head region using control rod shroud fans
- b. Cool S/G U-tubes by dumping steam from all S/Gs
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ES-0.2 TITLE:
NATURAL CIRCULATION COOLDOMN REV:
1 PAGE 14 of 14 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT 'OBTAINED CAUTION IF LESS THAN TWO CONTROL ROD SHROUD FANS ARE RUNNING, THE UPPER HEAD REGION MAY REMAIN ABOVE 200'F FOR UP TO 29 HOURS AFTER REACHING CSD.
22 Determine If RCS Depressurization Is Permitted:
- a. Entire RCS -
LESS THAN 200'F
~ Core exit T/Cs
~ Upper head T/Cs
~ RCS hot leg temperature
~ RCS cold leg temperature
- b. Check control rod shroud fan status BOTH RUNNING DURING COOLDOWN
- c. Maintain cold shutdown conditions (Refer to 0-2.3, PLANT AT COLD SHUTDOWN) a.
Do NOT depressurize RCS.
Return to Step 20.
- b. Consult Plant staff to determine wait period for upper head cooling.
-END-
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ES-0.2 NATURAL CIRCULATION COOLDOWN REV:
1 PAGE 1 of 1 ES-0.2 APPENDIX LIST TITLE PAGES 1)
RED PATH
SUMMARY
2)
FIGURE MIN SUBCOOLING
,3), FIGURE SDM 4)
FIGURE NAT CIRC C/D WITHOUT SHROUD FANS 5)
FIGURE NAT CIRC C/D WITH SHROUD FANS 6)
ATTACHMENT RCP START 7)
ATTACHMENT LETDOWN 8)
ATTACHMENT RHR COOL 9)
FOLDOUT
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ES-0.2 NATURAL CIRCULATION COOLDOWN REV:
1 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
4
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ES-0.2 TlTLE:
NATURAL CIRCULATION COOLDOWN REV:
1 PAGE 1 of 1 FIGURE MIN SUBCOOL1NG 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-0.2 NATURAL CIRCULATION COOLDOWN REV:
1 PAGE 1 of 1 FIGURE SDM BORON CONCENTRATION (PPM) 1800 1600 BORON INCREMENTS 20 PPM 1400 1200 ADEQUATE SDM 1000 soo 600 400 I-ORATE 200 BURNUP INCREMENTS 100 MUD/MTU 0
1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 CYCLE BURNUP (MWD/MTU)
NOTE: To obtain core burnup, use PPCS turn on code BURNUP.
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ES-0.2 NATURAL CIRCULATION COOLDOWN REV:
1 PAGE 1 of 1 FIGURE NAT CIRC C
D WITHOUT SHROUD FANS RCS 2500 2400 2300 2200 2100 2000 1900 1800 1700 1600 1500 1400 1300 1100 1000 900 800 700 600 500 400 300 200 100 0
PRESSURE (PSIG)
~
RCS PRESSURE INCREMENTS 20 PSIG ACCEPTABLE OPERATING REGION TEMPERATURE INCREMENTS 10'F 200 250 300 350 400 450 500 550 '00 650 700 RCS COLD LEG TEMPERATURE ('F) r1]
Wait 11 Hours before decreasing RCS pressure less than 1600 psig
[2]
RCS pressure should be maintained greater than 350 psig for 29 Hours to prevent voiding in the Rx vessel upper head.
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ES-0.2 TITLE:
'I NATURAL CIRCULATION COOLDOWN REV:
1 PAGE 1 of 1 FIGURE NAT CIRC C
D WITH SHROUD FANS RCS 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
PRESSURE (PSIG)
RCS PRESSURE INCREMENTS 20 PSIG ACCEPTABLE OPERATING REGION TEMPERATURE INCREMENTS 10'F 200 250 300 350 400 450 500 550 600 650 700 RCS COLD LEG TEMPERATURE ('F)
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ES-0.2 NATURAL CIRCULATION COOLDOWN REV 1
PAGE 1 of 1 FOLDOUT PAGE RCP TRIP CRITERIA 2.
IF BOTH conditions listed below occur, THEN trip both RCPs:
a.
SI pumps AT LEAST TWO RUNNING b.
RCS pressure minus maximum S/G pressure LESS THAN 175 psig SI PUMP AUTO SWITCHOVER CRITERION WHEN BAST level decreases to 104, THEN ensure SI pump automatic switchover to RWST.
3.
SI ACTUATION CRITERIA IF EITHER condition listed below occurs, THEN actuate SI and go to E-O, REACTOR TRIP OR SAFETY INJECTION, Step 1.
o RCS subcooling based on core exit, T/Cs LESS THAN O'F USING REQUIREMENTS OF FIGURE MIN SUBCOOLING 4
~
OR o
PRZR level CHARGING CAN NOT CONTROL LEVEL GREATER THAN 5%
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).