ML20065K057

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Rev 4 EOP ES-0.3, Natural Circulation Cooldown W/Steam Void in Vessel
ML20065K057
Person / Time
Site: Ginna 
Issue date: 03/30/1994
From:
ROCHESTER GAS & ELECTRIC CORP.
To:
Shared Package
ML17263A585 List:
References
ES-.3, ES-0.3, NUDOCS 9404190131
Download: ML20065K057 (20)
v • d • e


Text

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NATURAL CIRCULATION COOLDOWN WITH STEAM ES-0.3 VOID IN VESSEL PAGE 1 of 15 p,

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ROCHESTER GAS AND ELECTRIC CORPORATION GINNA STATION CONTROLLED COPY NUMBER TECHNICAL REVIEW S '3U /h PORC REVIEW DATE b

v f ' f f 7l<'G

---c PLANT SUPERINTENDENT - ').- Gy EFFECTIVE DATE CATEGORY 1.O REVIEWED BY: 9404190131 940414 PDR ADOCK 05000244 P PDR

r n. sw: T iii.c : I 4 NA AL CIRCULATION COOLDOWN WITH STEAM ES-0*3 VOID IN VESSEL PAGE 2 of 15-V,q. A. PURPOSE - This procedure provides actions to continue plant cool-down and depressurization to cold shutdown, with no accident in progress, under conditions that allow for the potential formation of 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 the first 9 steps, if rapid cooldown or'depressurization is required. B) ES-0.2, NATURAL CIRCULATION COOLDOWN, if depressurization is required which may result in upper head voiding. OV /O (_) i l

a E0P TITLEt 4 NA AL CIRCMION COOLDOWN WIM STEAM ES-0.3 VOID IN VESSEL PAGE 3 of 15 , [ ~ ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED STEP

                                                                          • +**'*

CAUTION IF SI ACTUATION OCCURS DURING TilIS PROCEDURE, E-0, REACTOR TRIP OR SAFETY o INJECTION, Sil0ULD PE PERFORMED. THE FIRST 13 STEPS OF ES-0.2, NATURAL CIRCUIATION C00LDOWN, SHOULD BE o 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 RCP Restart:
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 establish THAN 95%

subcooling based on core exit ~ T/Cs greater than 20*F using Figure 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 FROM HOT SHUTDOWN TO COLD CONDITION O

's- [EP: TITLE REV: 4 NATURAL CIRCULATION COOLDOWN WITH STEAM ES-0.3 VOID IN VESSEL PAGE 4'of 15 ~~ STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED NOTE: Saturated conditions in the'PRZR should be established before trying to decrease PRZR level. 2 Establish PRZR Level To Accommodate Void Growth: a. Check PRZR level - BETWEEN 20%

a. Control charging and letdown as AND 30%

necessary.

b. Place charging pump speed controllers in MANUAL O

i 4

4 s E0P: TITLE REW. 4 NATURAL CIRCULATION COOLDOWN WITH STEAM. ES-0.3 VOID IN VESSEL PAGE 5 of 15- ~ STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED i CAUTION BORON ADDITION TO ESTABLISH CSD CONCENTRATION SHOULD BE COMPLETE BEFORE o DECREASING RCS TEMPERATURE LESS THAN 500*F. THE AT BETWEEN PRZR LIQUID AND THE HOT LEG TEMPERATURE SHOULD NOT BE o PERMITTED TO EXCEED 200*F. IF THIS LIMIT IS EXCEEDED, THEN NOTIFY TECHNICAL 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 Leg Temperatures To 500*F:

a. Maintain cooldown rate in RCS cold legs - LESS THAN 50*F/HR
b. Control RCS pressure between 1900 psig and 1950 psig
c. Maintain RCS cold leg temperatures and pressure -

WITHIN LIMITS OF FIGURE NC C/D WITH VOID IN UPPER HEAD

d. Maintain stable PR2R level using charging
e. Check RCS hot leg temperatures -
e. Return to Step 3a.

LESS THAN 500*F

f. Stop RCS cooldown O

o EOP: ilTLE: CIEUNON COOLDOWN MW SM -ES-0,3 VOID IN VESSEL PAGE 6 of 15-

O

~~ S".l1P ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 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 than 1950-psig.
  • Train A
  • Train B
b. Place SI block switches to BLOCK:

o SAFETY INJECTION BLOCKED status

  • Train A light - LIT
  • Train B c Verify SAFETY INJECTION BLOCKED status light lit.
d. Go to Step 5.

l IF SI can NOT be blocked, THEN maintain PRZR pressure greater than 1750 psig and S/C pressure greater than 514 psig until SI blocked. O

" ;o; EOPi ilILE "^ ^' IRCMTION COOQOWN M SM ES-0*3 VOID IN VESSEL PAGE 7'of 15 ~ STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED CAUTION VOIDINC MAY OCCUR IN THE RCS DURING RCS DEPRESSURIZATION. THIS WILL RESULT IN A RAPIDLY INCREASING PRZR LEVEL. If charging line to PRZR vapor AT exceeds 320*F, then plant staff NOTE: o should be consulted before using auxiliary spray. WHEN using a PRZR PORV, THEN select one with an operable block o

valve, If auxiliary spray is in use, spray flow may be increased by o

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 (Refer O

to Attachment LETDOWN). J_E letdown can NOT be established, THEN depressurize RCS using one PRZR PORV and go to Step Sc.

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

PORV. )

c. Check RCS pressure -
c. Return to Step Sa.

APPROXIMATELY 1500 PSIC

d. Stop RCS depressurization i

I

i. EOP 11TLE: NATURAL CIRCULATION COOLDOWN WITH STEAM 4 ES-0.3 VOID IN VESSEL PAGE 8 of-15 J' STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 6 Isolate.SI ACCUMs: a. Dispatch A0 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
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 greater than 1000 psig until both-SI ACCUMs isolated.

JZ any SI ACCUM can NOT be O-isolated AND RCS depressurization to less than 1000 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 greater than SI ACCUM pressure.
c. Locally open breakers for MOV-841 a.d MOV-865

!) 1 O u 1 o 2.

EOP: ilTLE: NA 4 ES-0.3 CIRCMION COOLDOWN MW 'SMAM VOID IN VESSEL PAGE 9.of 15-f- -, STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 7 Continue RCS Cooldown And Depressuriation:

a. Maintain cooldown rate in RCS cold legs - LESS THAN 100*F/HR
b. Maintain RCS pressure - WITHIN LIMITS OF FIGURE NAT CIRC C/D WITH 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 (Refer to Attachment LETDOWN).

E letdown can NOT be established, THEN depressurize RCS using one PRZR PORV and go p to Step 8. V Depressurize RCS using auxiliary

e. E auxiliary spray valve NE c.

spray valve (A0V-296) available, THEN use one PRZR PORV. O ~ 1-.- a g -g-9 m _t w p

4 EOP: IIILE2 REV: 4 NATURAL CIRCULATION COOLDOWN WITH STEAM ES-0.3 VOID IN VESSEL PAGE 10 of 15 U STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 8 Control PRZR Level: a. Level - CREATER THAN 20%

a. Control charging and letdown to increase PRZR level to greater than 20%.
b. Level - LESS THAN 90%
b. Perform the following:
1) Turn on PRZR heaters to increase RCS pressure by 100 psi.
2) Decrease PRZR level to less than 30% by one of the following:

Control charging as o necessary -OR- ~ o Continue cooldown to shrink 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 maintain RVLIS level greater than 84%.
2) Return to Step 7.

o i l

e EDP: TifLE: _. j NATURAL CIRCULATION COOLDOWN WITH STEAM ES-0.3 VOID IN VESSEL PAGE-11.of 15 t ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED STEP

  • 10 Maintain Letdown Flow:

a. Open letdown orifice isolation valves as necessary

b. Adjust low pressure letdown pressure 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 Hx o 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 seal inj ection needle valves ' if necessary.

  • RCP A, V-300A
  • RCP B, V-300B IE RCP seal injection NOT in service, THEN go to Step 12,
i V

k - o

e E0P; ilTLE: NATURAL CIRCUWION COOLDOWN MH STEM ES-0.3 VOID IN VESSEL PAGE 12 of 15 ~. ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED STEP 12 Check If SI System Normal Shutdown Alignment Should Be Established: RCS cold leg temperature - LESS

a. Return to Step 7 a.

THAN 350*F l t

b. 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 in PULL STOP I

I

2) Locally close breakers for SI pump discharge valves to cold legs
  • MOV-878B, MCC D position 8C t
  • 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

O x q

,n . ~.. ~. ,~ .g. EOP ilTLE: NA L CIRC M TION COOLDOWN NITH STEAM 4 ES-0.3 VOID IN VESSEL PAGE 13 of 15 [ STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 13: Check If R11R Normal Cooling Can 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 ensure adequate 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 Plant OPERATION OF THE REACTOR VESSEL staff to determine if RHR normal OVERPRESSURE 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 Cold Shutdown e

s 1 -- % 'l

. ~. l toes ilTLE: REV:-4 NATURAL CIRCDLATION COOLDOWN WITH STEAM ES-0.3 VOID IN VESSEL PAGE.l'4 of 15 STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 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 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
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, F w-4_, Jr .i~+--..,_,. e 4.. f --r-m 7

i EOP: TITLE: ~ ~ ~ REV: 4 NATURAL CIRCULATION COOLDOWN WITH STEAM ES-0.3 VOID IN VESSEL PAGE 15 of 15 O STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED CAUTION IF NO CONTROL ROD SHROUD FANS ARE RUNNING, THE UPPER HEAD REGION MAY REMAIN ABOVE 200*F FOR UP TO 29 HOURS AFTER REACHING CSD. 16 Determine If RCS Depressurization Is Permitted:

a. Check PRZR level - LESS TilAN 30%
a. Perform the following:
1) Turn on PRZR heaters to maintain PRZR pressure stable.
2) Decrease PRZR level to less than 30% by one of the following:

AV o Control charging as necessary. -OR-o Continue cooldown to shrink RCS inventory,

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

Return to 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 determine status - BOTH RUNNING DURING wait period for upper head C00LDOWN
cooling,
d. Refer to 0-2.3, PLANT AT COLD SHUTDOWN

-END-l'u/

lr s. EDP: TifLE: NATURAL CIRCUL'ATION C'OOLDOWN.WITH STEAM REV::4 VOID IN VESSEL PAGE 1 of 1 d ES-0.3 APPENDIX LIST TITLE .PAGES .1) RED PATH

SUMMARY

1 1

l 2)

FIGURE MIN SUBCOOLING 1 l H 3) FIGURE NAT C/D WITH VOID IN UPPER HEAD 1 1 4) ATTACHMENT RCP START 1 l 5) ATTACHMENT RHR COOL 2 1 i 6) ATTACHMENT RHR SAMPLE 1- - l' j 7) ATTACHMENT LETDOWN 1- 'l i 8) FOLDOUT 1-l 1.. l l l~ l V l l

) EOP: 111LE: NATURAL CIRCULATION COOLDOWN WITH STEAM ES-0.3 VOID IN VESSEL PAGE 1 of 1 (U -~\\ 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 AND RVLIS 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 than 100*F in last 60 minutes AND RCS cold leg temperature less than 285'F CONTAINMENT - CNMT pressure greater than 60 psig e. O V OV

, p.' 1 .j EOP: TITLE-i 'REV* 4' NATURAL CIRCULATION COOLDOWN WITH STEAM ES-0.3 VOID IN VESSEL PAGE 1 of 1

6

_) FIGURE MIN SUBCOOLING e NOTE: Subcooling Margin = Saturation Temperature From Figure Below [-] Core Exit T/C Indication RCS PRESSURE (PSIG) 2500 2400 [ s RCS PRESSURE -=

==d I[- ^ ~ v' 2300 - E INCREMENTS 20 PSIG C -'~ ~ N$' z 2200 u nr a n t-

.afg-1 r~

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-m e

i s. d 1400 ~ ~~## ' I SUBC00 LED ~~. I g#zefIy'.- 1300 REGION r--; n.y 1200 I100 mm g: ' '*- rf 1000-900 r -

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p. @&2 r i r ti: } NATURAL CIRCULATION COOLDOWN WITH STEAM ES-0.3 VOID IN VESSEL PAGE 1 of l' q U 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 and go to E-0, 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% 3. 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). U}}

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