ML17262A889
| ML17262A889 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 05/06/1992 |
| From: | ROCHESTER GAS & ELECTRIC CORP. |
| To: | |
| Shared Package | |
| ML17262A884 | List: |
| References | |
| ES-.2, ES-0.2, NUDOCS 9206160396 | |
| Download: ML17262A889 (48) | |
Text
EOP: ES-0.2 NATURAL CIRCULATION COOLDOWN REV: 4 PAGE 1 of 17 ROCHESTER GAS AND ELECTRIC CORPORATION GINNA STATION CONTROLLED COPY NUMBER TECHNICAL REVIEW PORC REVIEW DATE PLANT SUPERINTENDENT E EC IVE DATE CATEGORY 1'.0 REVIEWED BY: 920bib039b 920b05 PDR ,ADOCK 05000244 P PDR
'1 EOP: ES-0'TIILE: NATURAL CIRCULATION COOLDOWN REV'PAGE 2 of 17 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-0.1, 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 W I THOUT S I REQU I RED g when it has been determined that a natural circulation cooldown is required.3)Other normal operating procedures when a natural circulation cooldown is required.
ES-0'T1TLE: NATURAL CIRCULATION COOLDOWN REV: 4 PAGE 3 of 17 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED*****************************************
CAUTION o IF SI ACTUATION OCCURS DURING THIS PROCEDURE, E-O, REACTOR TRIP OR SAFETY INJECTION, SHOULD BE PERFORMED.
o VOIDING MAY OCCUR IN THE RCS DURING RCS DEPRESSURIZATION.
THIS WILL RESULT IN A RAPIDLY INCREASING PRZR LEVEL.*****************************************NOTE: o Foldout page should be open and monitored periodically 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 11B energized o Refer to Attachment RCP START b.Start one RCP c.Any RCP-RUNNING d.Go to 0-2.2, PLANT SHUTDOWN FROM HOT SHUTDOWN TO COLD CONDITION a.Go to Step 2.c.Go to Step 2~
4<l C~i EOP ES-0'T!TLE: NATURAL CIRCULATION COOLDOWN REV 4 PAGE 4 of 17 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 2 Check VCT Makeup System: a.Verify the following:
l)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 20%-OR-o Level-STABLE OR INCREASING b.Manually increase VCT makeup flow as follows: l)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.
C n I, 8 EOP: ES-0'NATURAL CIRCULATION COOLDOWN REV 4 PAGE 5 of 17 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.IF 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 (45 kw)-BOTH RUNNING Start fans as necessary.
o Check one Rx compartment cooling fan (23 kw)-RUNNING
~',~$$~1)I l t 1f' EOP: ES-0'T!TLE NATURAL CIRCULATION COOLDOWN REV: 4 PAGE 6 of 17 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 6 Verify Adequate Shutdown Margin a.Direct HP to'ample the RCS for boron concentration
~RCS loop A~RCS loop B~PRZR b.Verify boron concentration-GREATER THAN REQUIREMENTS OF FIGURE SDM b.Perform the following:
1)Maintain RCS average temperature greater than 500'F until adequate SDM established.
2)Continue to borate as necessary.
ke A EOP: ES-0'TITLE: NATURAZ, CIRCULATION COOLDOWN REV: 4 PAGE 7 of 17 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED*****************************************CAUTION o IF CST LEVEL DECREASES TO LESS THAN 5 FEET, THEN ALTERNATE WATER SOURCES FOR AFW WILL BE NECESSARY (REFER TO ER-AFW.l, ALTERNATE WATER SUPPLY TO AFW PUMPS).o SI MUST BE BLOCKED BEFORE S/G PRESSURE DECREASES TO 514 PSIG.o THE bT BETWEEN PRZR LIQUID AND THE HOT LEG TEMPERATURE SHOULD NOT BE PERMITTED TO EXCEED 200'F.IF THIS LIMIT IS EXCEEDED, THEN NOTIFY TECHNICAL ENGINEERING OF THE MAXIMUM AT OBSERVED.7 Initiate RCS Cooldown To Cold Shutdown: a.Dump steam tocondenser b.Establish and maintain cooldown rate in RCS, cold legs-LESS THAN 25'F/HR c.Maintain S/G narrow range level BETWEEN 17%AND 39%a.Manually or locally dump steam using S/G ARVs.c.Control feed flow as necessary.
d.Plot RCS cold leg temperatures and PRZR temperature twice per hour (Refer to 0-2.2, PLANT SHUTDOWN FROM HOT SHUTDOWN TO COLD SHUTDOWN, for plot paper)8 Check RCS Hot Leg Temperatures
-LESS THAN 550'F Return to Step 7.
p~lb%4'tel EOP: ES-0'NATURAL CIRCULATION COOLDONN REV: 4 PAGE 8 of 17 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED NOTE: o If charging line to PRZR vapor~T exceeds 320'F, then plant staff should be consulted before using auxiliary spray.o WHEN using a PRZR PORV, THEN select one with an operable block valve.o If auxiliary spray is in use, spray flow may be increased by closing normal charging valve AOV-294 and normal PRZR spray valves.9 Depressurize RCS To 1950 PSIG: a.Check letdown-IN SERVICE a.Try to establish letdown (Refer to Attachment LETDOWN).b.Depressurize RCS using auxiliary spray valve (AOV-296)IF letdown can NOT be established, THEN depressurize RCS using one PRZR PORV and go to Step 10.b.IF auxiliary spray valve NOT available, THEN use one PRZR PORV.
I i*g f%~4'AA' EOP: ES-0.2 TITLE: NATURAL CIRCULATION COOLDOWN REV: 4 PAGE 9 of 17 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED*****************************************CAUTION SI ACTUATION CIRCUITS WILL AUTOMATICALLY UNBLOCK IF PRZR PRESSURE INCREASES TO GREATER THAN 1992 PSIG.*****************************************10 Check If SI Should Be Blocked: a.Check the following:
o PRZR pressure-LESS THAN 1950 PSIG a.Return to Step 9.-OR-o LOW PRZR PRESS BLOCK SAF INJEC status light-LIT b.Place SI block switches to BLOCK~Train A~Train B 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.11 Determine RCS Pressure And Temperature Limits: a.Check control rod shroud fans BOTH RUNNING a.Perform the following:
1)Maintain RCS pressure within limits of Figure NAT CIRC C/D WITHOUT SHROUD FANS.b.Maintain RCS pressure-WITHIN LIMITS OF FIGURE NAT CIRC C/D WITH SHROUD FANS 2)Go to Step 12.
4~J EOP: ES-0'NATURAL CIRCULATION COOLDOWN REV: 4 PAGE 10 of 17 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 12 Maintain PRZR Level Between 20%And 304 13 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
~4 EOP: ES-0.2 TITLE NATURAL CIRCULATION COOLDOWN REV: 4 PAGE 11 of 17 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED NOTE: o If at any 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 vapor aT exceeds 320'F,.then plant staff should be consulted before using auxiliary spray.o WHEN using a PRZR PORV, THEN select one with an operable block valve.o If auxiliary spray is in use, spray flow may be increased by closing normal charging valve AOV-294 and normal PRZR spray valves.14 Initiate RCS Depressurization:
a.Check letdown-IN SERVICE 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 15.b.Depressurize RCS using auxiliary spray valve (AOV-296)b.IF auxiliary spray valve NOT available, THEN use one PRZR PORV.c.Plot RCS temperature and pressure on curve selected in Step 11 hourly g~l EOP: ES-0.2 NATURAL CIRCULATION COOLDONN REV: 4 PAGE 12 of 17 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 15 Continue Cooldown And Depressurization:
a.Check RCS cold leg temperature-GREATER THAN 335'F b.Maintain cooldown rate in RCS cold legs-LESS THAN 25'F/HR c.Maintain RCS temperature and pressure within limits of Figure determined previously a.Stabilize RCS temperature and go to Step 15c.c.Control RCS pressure as necessary to restore pressure/temperature relationship to within limits of approprite Figure.16 Establish Required RCS Hydrogen Concentration (Refer to S-3.3C, H2 OR 02 REMOVAL FROM PRIMARY SYSTEM BY BURPING VCT)17 Check For Steam Void In Reactor Vessel: Repressurize RCS within allowable limits and continue cooldown.o PRZR level-NO UNEXPECTED LARGE VARIATIONS o RVLIS level (no RCPs)-GREATER THAN 958 IF RCS depressurization must continue, THEN go to ES-O.3, NATURAL CIRCULATION COOLDOWN WITH STEAM VOID IN VESSEL.
%h~4 fbi EOP: ES-0'TITLE: NATURAL CIRCULATION COOLDOWN REV: 4 PAGE 13 of 17 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 18 Check If SI ACCUMs Should Be Isolated: a.RCS pressure-LESS THAN 1500 PSIG 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 discharge valves~ACCUM A, MOV-841~ACCUM B, MOV-865 a.Continue with Step 19.WHEN RCS pressure is less than 1500 psig, THEN do Steps 18b through d.c.IF any valve can NOT be closed, THEN perform the following:
1)Dispatch personnel to locally close valves, as necessary.
2)Maintain RCS pressure greater than 1000 psig until both SI ACCUMs isolated.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.~ACCUM A, AOV-834A~ACCUM B, AOV-834B d.Locally open breakers for MOV-841 and MOV-865 2)Open HCV-945.3)Maintain RCS pressure greater than SI ACCUM pressure.
g4 EOP: ES-0'TITLE: NATURAL CIRCULATION COOLDOWN REV: 4 PAGE 14 of 17 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 19 Maintain Letdown Flow: a.Open letdown orifice valves as necessary b.Adjust low pressure letdown control valve setpoint as necessary F 20 Maintain Required RCP Seal Injection Flow And Labyrinth'Seal D/P: o Labyrinth seal D/P to each RCP GREATER THAN 15 INCHES OF WATER 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 adjust seal injection needle valves if necessary.
~RCP A, V-300A~RCP B, V-300B
EOP I ES-0'TITLE: NATURAL CIRCULATION COOLDOWN REV 4 PAGE 15 of 17 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 21 Check If SI System Normal Shutdown Alignment Should Be Established:
a.RCS cold leg temperature
-LESS THAN 350'F a.Return to Step 15.b.RCS pressure-LESS THAN 1500 PSIG c.Lock out SI system as follows: 1)Place all SI pump switches in PULL STOP b.Stabilize RCS temperature and return to Step 14.2)Locally close breakers for SI pump discharge valves to cold legs~MOV-878B, MCC D position 8C~MOV-878D, MCC D position 8F 3)Close SI pump discharge to cold legs~MOV-878B~MOV-878D 4)Locally open breakers for MOV-878B and MOV-878D
'I b~", l Js EOP: ES-0+2 TITLE: NATURAL CIRCULATION COOLDOWN REV: 4 PAGE 16 of 17 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 22 Check If RHR Normal Cooling Can Be Established:
a.RCS pressure-LESS THAN 400 PSIG b.Verify all SI pump switches in PULL STOP a.Stabilize RCS temperature and return to Step 14.b.Return to Step 21.c.Sample the RHR system to ensure adequate boron concentration (Refer to Attachment RHR SAMPLE)d.Place RCS overpressure-protection system in service (Refer to 0-7, ALIGNMENT AND OPERATION OF THE REACTOR VESSEL OVERPRESSURE PROTECTION SYSTEM)e.Establish RHR normal cooling (Refer to Attachment RHR COOL)d.IF RCS overpressure protection system can NOT be placed in service, THEN consult'lant staff to determine if RHR normal cooling should be established and go to Step 23.23 Continue RCS Cooldown To Cold Shutdown*****************************************CAUTION DEPRESSURIZING THE RCS BEFORE THE ENTIRE RCS IS LESS THAN 200'F MAY RESULT IN ADDITIONAL VOID FORMATION IN THE RCS.24 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 y>>A EOP: ES-0'TITLE'ATURAL CIRCULATION COOLDOWN REV: 4 PAGE 17 o f 17 STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED******************0**********************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.*****************************************\25 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 COOLDOMN c.Maintain cold shutdown conditions (Refer to.0-2.3, PLANT AT COLD SHUTDOWN)a.Do NOT depressurize RCS.Return to Step 23.b.Consult Plant staff to determine wait period for upper head cooling.-END-
EOP: ES-0'NATURAL CIRCULATION COOLDOWN REV: 4 PAGE 1 of 1 ES-0.2 APPENDIX LIST TITLE 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)ATTACHMENT RHR SAMPLE 10)FOLDOUT PAGES a C EOP: ES-0.2 NATURAL CIRCULATION COOLDOWN 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 t'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 IN NN VN N~NN EOP: ES-0'TITLE: NATURAL CIRCULATION COOLDOWN REV'PAGE 1 of 1 FIGURE MIN SUBCOOLING NOTE: Subcooling Margin=Saturation Temperature From Figure Below[-]Core Exit T/C Indication RC 2500 2400 2300 2200'100 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 DVE RS NMT 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)
~~I~1 0%0~~C~0'g*%1 EOP: ES-0'TITLE: NATURAL CIRCULATION COOLDOWN REV: 4 PAGE 1 of 1 BORON CONCENTRATION (PPH)1800 FIGURE SDM 1600 BORON INCREMENTS 20 PPH 1400 1200 1000 ADE(UATE SDH 100 PPH CONS ERVAT I SH INCLUDED800 600 400 BORA 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.
e<<H~n 1~I e4 EOP: ES-0.2 TITLE: NATURAL CIRCULATION COOLDOWN REV'PAGE 1 of 1 RCS 2500 PRESSURE (PSIG)FIGURE NAT CIRC C D WITHOUT SHROUD FANS 2400 2300 2200 2100 2000 1900 1800 1700 1600 RCS PRESSURE INCREMENTS 20 PSIG RCS temp for S/G SI (514 psig)SI UNBLOCK NORMAL RANGE 1500 1400 1300 1200 1100 1000 900 800 700 600 500 400 300 200ioO[2]Wait 29 hrs before decreasing RCS pressure less than 350 psig to prevent boiling in upper head[1]Wait ll hrs before decreasing RCS pressure less than 600 psig TEMPERATURE INCREMENTS 10'F 0 50 100 150 200 250 300 350 400'50 500 550 600 650 700 RCS COLD LEG TEMPERATURE
(')
4 t S,i H 4 N+J a~I
EOP: ES-0'TITLE: NATURAL CIRCULATION COOLDOWN REV: 4 PAGE 1 of 1 2400 2300 RCS PRESSURE INCREMENTS 20 PSIG 2200 2100 2000 1900 1800 1700 1600 1500 1400 1300 1200 1100 1000 900 800 700 600 500 400 300 200 RCS PRESSURE (PSIG)2500 FIGURE NAT CIRC C D WITH SHROUD FANS RCS temp for S/G SI (514 psig)SI UNBLOCK NORMAL RANGE TEMPERATURE INCREMENTS 10'F 0 50 100 150 200 250 300 350 400 450 500 550 600 650 700 RCS COLD LEG TEMPERATURE
(')
~~
EOP: ES-0.2 TITLE: NATURAL CIRCULATION COOLDOWN REV 4 PAGE 1 of 1 RCP TRIP CRITERIA FOLDOUT PAGE 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 10%, 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 OR o PRZR level-CHARGING CAN NOT CONTROL LEVEL GREATER THAN 5%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.1, ALTERNATE WATER SUPPLY TO AFW PUMPS).