porc review date s '3u /hecp: f lit.e : |, * natural circulation cooldown with steam * es-0.3...

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* NATURAL CIRCULATION COOLDOWN WITH STEAM *

ES-0.3VOID IN VESSEL

PAGE 1 of 15p, __

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ROCHESTER GAS AND ELECTRIC CORPORATION

GINNA STATION

CONTROLLED COPY NUMBER

TECHNICAL REVIEW

S '3U /hPORC REVIEW DATE -

bvf ' f f 7|<'G ---c

PLANT SUPERINTENDENT

}} - ') .- GyEFFECTIVE DATE

CATEGORY 1.O

REVIEWED BY:

9404190131 940414PDR ADOCK 05000244P PDR,

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sw: T iii.c :I 4NA AL CIRCULATION COOLDOWN WITH STEAM-

ES-0*3VOID IN VESSEL PAGE 2 of 15-

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A. PURPOSE - This procedure provides actions to continue plant cool-down and depressurization to cold shutdown, with no accident inprogress, under conditions that allow for the potential formationof a void in the upper head region.

B. SYMPTOMS AND OR ENTRY CONDITIONS

1. ENTRY CONDITIONS - This procedure is entered from:

A) ES-0.2, NATURAL CIRCULATION COOLDOWN, after completing thefirst 9 steps, if rapid cooldown or'depressurization isrequired.

B) ES-0.2, NATURAL CIRCULATION COOLDOWN, if depressurizationis required which may result in upper head voiding.

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E0P TITLEt4NA AL CIRCMION COOLDOWN WIM STEAM"


PAGE 3 of 15

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ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINEDSTEP- -

*************************************+**'*CAUTION

IF SI ACTUATION OCCURS DURING TilIS PROCEDURE, E-0, REACTOR TRIP OR SAFETYo,

INJECTION, Sil0ULD PE PERFORMED.

THE FIRST 13 STEPS OF ES-0.2, NATURAL CIRCUIATION C00LDOWN, SHOULD BEo

PERFORMED BEFORE CONTINUING WITH THIS PROCEDURE. '

IF RCP SEAL COOLING HAD PREVIOUSLY BEEN LOST,THEN THE AFFECTED RCP SHOULD 'o

NOT BE STARTED PRIOR TO A STATUS EVALUATION.

*****************************************

NOTE: Foldout page should be open and monitored periodically.

* 1 Monitor Conditions For RCPRestart:

a. Verify Bus 11A or Bus llB - a. Go to Step 2.ENERGIZED

b. Check RVLIS indication: b. Perform the following:

o At least one train of RVLIS - 1) Increase PRZR level to 65%AVAILABLE using charging and letdown.

o Level (no RCPs) - CREATER 2) Dump steam to establishTHAN 95% subcooling based on core exit

~

T/Cs greater than 20*F usingFigure MIN SUBC00 LING. j

J

c. Establish conditions for c. Go to Step 2. ;starting an RCP (Refer to '

Attachment RCP START)

d. Start one RCP _).i

e. Any RCP - RUNNING e. Go to Step 2.

f. Go to 0-2.2., PLANT SilUTDOWN FROMHOT SHUTDOWN TO COLD CONDITION

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STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED- -

NOTE: Saturated conditions in the'PRZR should be established before tryingto decrease PRZR level.

2 Establish PRZR Level ToAccommodate Void Growth:

a. Check PRZR level - BETWEEN 20% a. Control charging and letdown as -

AND 30% necessary. ,

b. Place charging pump speedcontrollers in MANUAL

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REW . 4NATURAL CIRCULATION COOLDOWN WITH STEAM.'-


PAGE 5 of 15-~

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED i-

*****************************************CAUTION

BORON ADDITION TO ESTABLISH CSD CONCENTRATION SHOULD BE COMPLETE BEFOREo

DECREASING RCS TEMPERATURE LESS THAN 500*F.

THE AT BETWEEN PRZR LIQUID AND THE HOT LEG TEMPERATURE SHOULD NOT BEo

PERMITTED TO EXCEED 200*F. IF THIS LIMIT IS EXCEEDED, THEN NOTIFYTECHNICAL ENGINEERING OF THE MAXIMUM AT OBSERVED.

*****************************************NOTE: RCS hot leg temperatures will decrea,o after cooldown is stopped due

to decrease in loop delta Ts.

3 Decrease RCS Hot LegTemperatures To 500*F:

a. Maintain cooldown rate in RCScold legs - LESS THAN 50*F/HR

b. Control RCS pressure between1900 psig and 1950 psig

,

c. Maintain RCS cold legtemperatures and pressure -

WITHIN LIMITS OF FIGURE NC C/DWITH VOID IN UPPER HEAD

d. Maintain stable PR2R level usingcharging

e. Check RCS hot leg temperatures - e. Return to Step 3a.LESS THAN 500*F

,

f. Stop RCS cooldown

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CIEUNON COOLDOWN MW SM'

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S".|1P - ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED.

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-9 ****************************************CAUTION

SI ACTUATION CIRCUITS WILL AUTOMATICALLY UNBLOCK IF PRZR PRESSURE INCREASES-20 GREATER THAN 1992 PSIC.

* ****************************************

.

4 Verify SI Blocked: Perform the following:

o SI block switches in BLOCK a. Verify PRZR pressure less than1950-psig.

* Train A* Train B b. Place SI block switches to BLOCK:

o SAFETY INJECTION BLOCKED status * Train Alight - LIT * Train B

c Verify SAFETY INJECTION BLOCKEDstatus light lit.

d. Go to Step 5. |

IF SI can NOT be blocked, THENmaintain PRZR pressure greater than1750 psig and S/C pressure greaterthan 514 psig until SI blocked.

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"^ ^' IRCMTION COOQOWN M SM.

ES-0*3VOID IN VESSEL

PAGE 7'of 15~

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*****************************************CAUTION

VOIDINC MAY OCCUR IN THE RCS DURING RCS DEPRESSURIZATION. THIS WILL RESULTIN A RAPIDLY INCREASING PRZR LEVEL.

* ****************************************

If charging line to PRZR vapor AT exceeds 320*F, then plant staffNOTE: o,

should be consulted before using auxiliary spray.

WHEN using a PRZR PORV, THEN select one with an operable blockovalve,

If auxiliary spray is in use, spray flow may be increased byo

closing normal charging valve A0V-294 and normal PRZR spray valves.

5 Depressurize RCS To 1500 PSIG:

a. Check letdown - IN SERVICE a. Try to establish letdown (ReferO to Attachment LETDOWN).

J_E letdown can NOT beestablished, THEN depressurizeRCS using one PRZR PORV and goto Step Sc.

.|b. Depressurize RCS using auxiliary b. IE auxiliary spray valve E0,I |spray valve (A0V 296) available, THEN'use one PRZRl

PORV. )

c. Check RCS pressure - c. Return to Step Sa.APPROXIMATELY 1500 PSIC

d. Stop RCS depressurizationi

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NATURAL CIRCULATION COOLDOWN WITH STEAM'

4.


PAGE 8 of-15.

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6 Isolate.SI ACCUMs:

a. Dispatch A0 with locked valve,

key to locally close breakersfor SI ACCUM discharge valves

* MOV-841, MCC C position 12f' ,

* MOV-865, MCC D position 12C

b. Close SI ACCUM discharge valves b Perform the following:

* ACCUM A, MOV-841 1) Dispatch personnel to locally* ACCUM B, MOV-865 close valves, as necessary,

2) Maintain RCS pressure greaterthan 1000 psig until both-SIACCUMs isolated.

JZ any SI ACCUM can NOT be

O- isolated AND RCS,

. depressurization to less than1000 psig is required, THEN:

1) Open vent valves for

unisolated SI ACCUMs.

* ACCUM A, A0V 834A* ACCUM B, A0V-834B

2) Open MCV-945,

3) Maintain RCS pressure greaterthan SI ACCUM pressure.

c. Locally open breakers for>

MOV-841 a.d MOV-865;

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NA 4ES-0.3 CIRCMION COOLDOWN MW 'SMAM.

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7 Continue RCS Cooldown AndDepressuriation:

a. Maintain cooldown rate in RCScold legs - LESS THAN 100*F/HR

b. Maintain RCS pressure - WITHINLIMITS OF FIGURE NAT CIRC C/DWITH VOID IN UPPER llEAD

c. Check RCS cold leg temperature - c. Stabilize RCS temperature,GREATER THAN 335'F

d. Check letdown - IN SERVICE d. Try to establish letdown (Referto Attachment LETDOWN).

E letdown can NOT be_

established, THEN depressurizeRCS using one PRZR PORV and gop to Step 8.

VDepressurize RCS using auxiliary e. E auxiliary spray valve NEc.spray valve (A0V-296) available, THEN use one PRZR

PORV.

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VOID IN VESSELPAGE 10 of 15

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U l- STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED

8 Control PRZR Level:

a. Level - CREATER THAN 20% a. Control charging and letdown toincrease PRZR level to greaterthan 20%.

b. Level - LESS THAN 90% b. Perform the following:

1) Turn on PRZR heaters toincrease RCS pressure by100 psi.

2) Decrease PRZR level to lessthan 30% by one of thefollowing:

Control charging aso

necessary

-OR-

~

o Continue cooldown toshrink RCS inventory.

9 Check RVLIS Indication:

a. At least one train of RVLIS - a. Go to Step 10.AVAILABLE

b. Check RVLIS level (no RCPs) - b. Perform the following:GREATER THAN 84%

1) Repressurize RCS to maintainRVLIS level greater than 84%.

2) Return to Step 7.

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NATURAL CIRCULATION COOLDOWN WITH STEAM.

|ES-0.3'

VOID IN VESSEL '

PAGE-11.of 15

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*10 Maintain Letdown Flow:

a. Open letdown orifice isolationvalves as necessary

b. Adjust low pressure letdownpressure controller as necessary

*11 Maintain Required RCP Seal If RCP seal injection in service.Injection Flow And Labyrinth THEN perform the following:Seal D/P:

o . Adjust charging flow to RECEN Hxo Seal injection flow to each RCP (HCV-142) as necessary.

- GREATER THAN 6 GPM-OR-

Labyrinth' seal D/P to each RCP -o

GREATER THAN 15 INCHES OF WATER o Dispatch A0 to adjust sealinj ection needle valves ' if

. necessary.

* RCP A, V-300A-

,

* RCP B, V-300B.

IE RCP seal injection NOT inservice, THEN go to Step 12,

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NATURAL CIRCUWION COOLDOWN MH STEM* ES-0.3VOID IN VESSEL

PAGE 12 of 15~. .


12 Check If SI System NormalShutdown Alignment Should BeEstablished:

RCS cold leg temperature - LESS a. Return to Step 7a.THAN 350*F

|tb. RCS pressure - LESS THAN b. Stabilize RCS temperature and. ;

1500 PSIG return to Step 7.

c. Lock out SI system as follows:

1) Place all SI pump switches inPULL STOP I

I

2) Locally close breakers for SIpump discharge valves to coldlegs

* MOV-878B, MCC D position 8Ct * MOV-878D, MCC D position 8F

3) Close SI pump discharge tocold legs

* MOV-878B* MOV-878D

4) Locally open breakers forMOV-878B and MOV-878D

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NA L CIRC M TION COOLDOWN NITH STEAM 4.


PAGE 13 of 15

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13: Check If R11R Normal CoolingCan Be Established:

a. RCS pressure - LESS TilAN 400 PSIG a. Stabilize RCS temperature and'return to Step 7.

b Verify all SI pump switches in b. Return to Step 12.,

PULL STOP

c. T, ample the RHR system to ensureadequate boron concentration

(Refer to Attachment RHR SAMPLE)' d. Place RCS overpressure d. JJ RCS overpressure protection

protection system in service system can NOT be placed in(Refer to 0 7, ALIGNMENT AND service, THEN consult PlantOPERATION OF THE REACTOR VESSEL staff to determine if RHR normalOVERPRESSURE PROTECTION SYSTEM) cooling should be established

and go to Step 14.

. e. Establish RilR normal cooling(Refer to Attachment RHR COOL)

i:

14 Continue RCS Cooldown To ColdShutdown

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toes ilTLE:REV:-4NATURAL CIRCDLATION COOLDOWN WITH STEAM. . ES-0.3

VOID IN VESSEL PAGE.l'4 of 15.


*****************************************

CAUTION.,

DEPRESSURIZING THE RCS BEFORE THE ENTIRE RCS IS LESS TilAN 200'F MAY RESULT IN ,

ADDITIONAL VOID FORMATION IN THE RCS, 1

*************************** **************

15 Continue Cooldown Of InactivePortion Of RCS:

a. Cool upper head region usingcontrol rod shroud fans

b. Cool S/G U-tubes by dumpingsteam from all S/Gs

c. Check RVLIS indication:

1) At least one train of RVLIS - 1) Go to Step 16,AVAILABLE,

2) Level (no RCPs) - CREATER 2) Stabilize RCS pressure and *

THAN 95%- return to Step 14,

.

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REV: 4NATURAL CIRCULATION COOLDOWN WITH STEAM.ES-0.3

VOID IN VESSELPAGE 15 of 15

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STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED--

*****************************************CAUTION

IF NO CONTROL ROD SHROUD FANS ARE RUNNING, THE UPPER HEAD REGION MAY REMAINABOVE 200*F FOR UP TO 29 HOURS AFTER REACHING CSD.

* ****************************************

16 Determine If RCSDepressurization Is Permitted:

a. Check PRZR level - LESS TilAN 30% a. Perform the following:

1) Turn on PRZR heaters tomaintain PRZR pressure stable.

2) Decrease PRZR level to lessthan 30% by one of thefollowing:

AV o Control charging as

necessary.

-OR-

o Continue cooldown toshrink RCS inventory,

b. Entire RCS - LESS THAN 200*F b. Do $_0,I depressurize RCS. Returnto Step 14.

* Core exit T/Cs* Upper head T/Cs* RCS hot leg temperature* RCS cold leg temperature

c. Check control rod shroud fan c. Consult Plant staff to determinestatus - BOTH RUNNING DURING wait period for upper head

|C00LDOWN cooling,

|I

d. Refer to 0-2.3, PLANT AT COLD I

SHUTDOWN

-END-

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NATURAL CIRCUL'ATION C'OOLDOWN.WITH STEAM REV::4...- *

VOID IN VESSELPAGE 1 of 1 d

ES-0.3 APPENDIX LIST

TITLE .PAGES !

.1) RED PATH SUMMARY 1 1

:|2) FIGURE MIN SUBCOOLING 1 l

'

H3) FIGURE NAT C/D WITH VOID IN UPPER HEAD 1 1

4) ATTACHMENT RCP START 1l

l

! 5) ATTACHMENT RHR COOL 21 -

.

i 6) ATTACHMENT RHR SAMPLE 1- - |' j

. 7) ATTACHMENT LETDOWN 1- '|i

8) FOLDOUT 1-|

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NATURAL CIRCULATION COOLDOWN WITH STEAM *,,


PAGE 1 of 1

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RED PATH SUMMARY

a. SUBCRITICALITY - Nuclear power greater than 5%

b. CORE COOLING - Core exit T/Cs greater than 1200*F-OR-

Core exit T/Cs greater than 700*F ANDRVLIS level (no RCPs) less than 43% [46%adverse CNMT)

c. HEAT SINK - Narrow range level in till S/Gs less than 5% ![25% adverse CNMT) AND total feedwater flow |

less than 200 gpm

d. INTEGRITY - Cold leg temperatures dacrease greater than100*F in last 60 minutes AND RCS cold legtemperature less than 285'F

CONTAINMENT - CNMT pressure greater than 60 psige.

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NATURAL CIRCULATION COOLDOWN WITH STEAM *.


PAGE 1 of 1 :

:6 ._

_)FIGURE MIN SUBCOOLING e

NOTE: Subcooling Margin = Saturation Temperature From FigureBelow [-] Core Exit T/C Indication

RCS PRESSURE (PSIG)'

2500

2400 [" ' "

s RCS PRESSURE -=' '

==d,._

I[-^ "- ~ v'2300 -

E INCREMENTS 20 PSIG C -'~- ~ N$'

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I100 -

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CORE EXIT SATURATION TEMPERATURE (*F)

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NATURAL CIRCULATION COOLDOWN WITH STEAM.


PAGE 1 of l'

qU

FOLDOUT PAGE

1. RCP TRIP CRITERIA

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

2. SI ACTUATION CRITERIA

If EITHER condition listed below occurs, THEN actuate SI andgo to E-0, REACTOR TRIP OR SAFETY INJECTION, Step 1.

o RCS subcooling based on core exit T/Cs - LESS THAN O'F USINGREQUIREMENTS OF FIGURE MIN SUBCOOLING

- OR -

o PRZR level - CHARGING CAN NOT CONTROL LEVEL GREATER THAN 5%

3. AFW SUPPLY SWITCHOVER CRITERION

IF CST level decreases to less than 5 feet, THEN switch toalternate AFW water supply (Refer to ER-AFW.1, ALTERNATE WATERSUPPLY TO AFW PUMPS).

U

porc review date s '3u /hecp: f lit.e : |, * natural circulation cooldown with steam * es-0.3...

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