ML20204J767

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Rev 2 to Emergency Operating Procedure ES-3.3, Post-Steam Generator Cooldown Using Steam Dump
ML20204J767
Person / Time
Site: Millstone, Haddam Neck, 05000000
Issue date: 06/03/1988
From:
CONNECTICUT YANKEE ATOMIC POWER CO.
To:
Shared Package
ML20204H467 List: ... further results
References
ES-3.3, NUDOCS 8810250247
Download: ML20204J767 (13)
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Text

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JUN 3 1988 s

NUMBER TTTU REY. ISSUE /DATE ES 3.3 POST SGTR COOLDOWN USING STEAM DUMP Rev. 2 l

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A.

PURPOSE This procedure provides actions to cooldown and depressurize the plant to cold shutdown conditions followinJ a steam generator tube rupture. This recovery method depressurizes the ruptured SG(s) by c umping steam.

B.

SYMPTOMS OR ENTRY CONDITIONS

'this procedure is entered from:

1.

E 3, STEAM GENERATOR RIBE RUlrrURE, Step 36, if plant staff selects the steam dump method.

2.

ES 3.1, POST SGTR COOLDOWN USING BLOWDOWN, Step 11, when blowdown is not available and plant staff selects steam dump method.

i 8810250247 001007 PDR ADOCK 05000213 P

PDR Page 1 of 13

JUN a_1ggd NUMBER mu REV. ISSLTJDATE ES 3.3 POST.SGTR COOLDOWN USING STEAM DUMP Rev.2 l

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STEP ACT10N/ EXPECTED RESPONSE RESPONSE NOT OBTAINED r

7 CAUTION:

o STEAh! SHOULD NOT BE RELEASED FROSI ANY RUPTURED SG IF WATER AIAY EXIST IN ITS STEAbiUNE.

o AN OFF. SITE DOSE EVALUATION SHOULD BE COSIPLETED PRIOR TO USING THE PROCEDURE.

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NOTE:

FOLDOUT PAGE SHOULD BE OPEN.

1 TURN ON PRZR HEATERS AS NECESSARY TO SATURATE PRZR WATER AT RUPTURED SC(s)

PRESSURE.

2 BORATE THE RCS FOR COOLDOWN IN ACCORDANCE WITH SUR 5.319 BORATION REQUIREMENTS FOR REACTOR SHlTIDOWN f

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a. Ch A MCC 8. ENERGlZED
a. Energize MCC 8.

3 VERIFY ADEQUATE SHUTDOWN l

MARGIN:

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a. Sample ruptured SG(s) l
b. Sample RCS j
c. Check shutdown margin ADEQUATE
c. Borate RCS as necessary.

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JUN 3 1988 NL'MBER TTn2 REV. ISSIEDATE ES 3.3 POST.SGTR COOLDOWN USING STEAh! DUht?

Rev.2

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STEP ACT10NSXPECTED RESPONSE RESPONSE NOT OBTAINED i

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CAUTION:

Af0NITOR DWST LEVEL. START AfAKEUP TO DWST BEFORE LEVEL DECREASES TO $4,000 GALLONS.

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4 CHECK lhTACT SG LEVELS:

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a. Checl wide range levels -
a. hiaintain total AUX feedwater flow l

GREATER THAN 63 %

greater than 320 GPM until wide (67 % FOR ADVERSE range levelin at least one SG is I

CONTAINMENT) greater than 63 %

(67 % for adverse containment).

b. Control AUX feedwater flow to
b. IE any SG wide range level continues maintain wide range levels between to increase in an uncontrolled nunner, 63 % and 69 %

IIIES QQ IQ E 3, (67 % and 69 % for adverse SUiAhi GENERATOR 1UBE itainment)

RUPTURE, Step 1.

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JUN 3 1988 NUMBER 1TTU REY. ISSUE /DATE l

ES 3.3 POST SGTR COOLDOWN USING STEAM DUMP Rev.2 l

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STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED NOTEt SINCE RUPTURED SG(s) MAY COhTINUE YO DEPRESSURIZE TO LESS THAN THE hilNIStUM RCS PRESSURE NECESSARY FOR COhTINUED RCP OPERATION, COOLDOWN TO COID SHbTDOWN SHOULD BE COhfPLETED AS QUICKLY AS POSSIBLE, NOT TO EXCEED 100*FI HR.

5 INITIATE RCS COOLDOWN TO 300* F (277* F FOR ADVERSE CONTAINMENT)

a. Maintain cooldown rate in RCS cold legs -

LESS 111AN 100' F/ HR

b. Dump steam to the condenser b.Manatlly OR locallydumps'eam from intact SG(s) from intact SG(s):

o Use atmospheric vent valve.

IE no intact SG available, TiiEN perform one of the following: l o Use faulted SG 2

o GQIQ ECA 3.1, SGTR WTDI LOSS OF REACIOR COOLAhT.

SUBCOOLED RECOVERY DESIRED, Step 1.

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  • of 13

JUN 3 1988 NutBER TM.E REV I5SUEsDATE ES 3.3 POST SGTR COOLDOWN USING STEAh! DUMP Rev.2 l

l STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINID I

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l CAUTION:

RCS AND RUPTURED SG(s) PRESSURES MUST BE MAINTAINED i

LESS THAN THE RUPTURED SG(s) SAFETY VALVE SETPOINT.

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l 6

CONTROL RCS PRESSURE AND htAKEUP FLOW TO htINIhtIZE RCS TO SECONDARY LEAKAGE:

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a. Perfortu appropriate action (s) l from table below:

l PRZR LEVEL RUI'rURED SG(s) LEVEL INCREASINO DECREASING 0FFSCALE lilGH LESS TPAN 15 %

o Increase RCS Increase RCS o Increase RCS I

( 35 % FOR rfukeup now rnakeup Dow rnakeup How ADVERSE

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CONTAINhtENT) o Depressurize RCS o Maintain RCS and l

using Step 6 b ruptured SG(s) pressures equal DETWEEN 15 %

Depressurize RCS Tum on PRZR Maintain RCS l

AND 50 %

using Step 5 b heaters and ruptured

( 35 % AND 50 %

SG(s) pressures j

FOR ADVERSE equal CONTAINMENT )

l BEDVEEN 50 %

o Depressurize RCS Turn on PRZR Mairoain RCS AND 76 %

using Step 6 b heaters and ruptured

( 50 % AND 69 %

SG(s) pressures i

FOR ADVERSE o Decrease RCS equal CONTAINMENT) makeup now GREATER TilAN Decrease RCS Turn on PRZR Maintain RCS 76 %

makeup now heaters and ruptured t

( 69 % FOR SG(s) pressures ADVERSE equal CONTAINMEST)

b. Use normal PRZP, spray to
b. IE letdown is in service, l

accomplish action specified in HIES use ausiliary spray.

table for step 6 a i

i IE letdown SQIin service.

I T}iEN use one PRZR PORV.

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JUN 3 1988 r.utBER mu

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ES 3.3 POST SGTR COOLDOWN USING STEAM DUMP ev i

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AWON/ EXPECTED RESPONSE RESPONSE NOT OBTAINED 7

CHECK IF SOLID PLANT CONDmONS SHOULD BE ESTABLISHED:

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[g n s,wam hase temperature - a. Continue,RCS cooldown and depressunution, 1

MIEN PRZR temperature is less than 450' F, DIEN do step 7 b.

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b. Increase PRZR level to 100 %

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JUN 3 1988 NUMBER TTTU REY. ISSUESATE I

ES 3.3 POST SGTR COOLDOWN USING STEAM DUMP Rev.2

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i l STEP ACTON/ EXPECTED RESPONS3 RESPONSE NOT OBTAINED I

NOTEt o

THE SI SYSTEht AfUST BE DISABLED BEFORE RCS TEh!PERATURE IS REDUCED BELOW 3]S

  • F.

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IF RUPTURED SG(s) PRESSURE IS GREATER THAN 325 PSIG, f

I ESTABUSH BLOWDOWN OR VENT STEAhi FROhf STEAAf l

GENERATOR TO REDUCE STEAht GENERATOR AND RCS l

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PRESSUE.

8 PERFORM COLD SliUTDOWN i

ALIGNMENT:

a. Check core exit thermocouples -
a. Continue RCS cooldown.

4 LESS T11AN 350' F WrIEN core exit thermocouples are less than 350' F.,

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b. Align core cooling equipment IN ACCORDANCE WTUI i

NOP 2.3-4, ilOTSTANDBY MODE 3 TO COLD SHUTDOWN MODE 5 i

4 ASD i

NOP 2.121, CORE COOLING SYSTEM LINEUP l

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FOR SliUTDOWN AND AT PO%TR i

OPERAT10N

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c. Check iflow temperature over
c. WlIEN all conditions are satisfied, I

pressure protection relief valves TllEN do step 8 d.

i should be placed in senice:

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1, Check PRZRlevel SOLID 1

2, Check RCS temperature.

l LESS 71iAN 325' F i

3. Check PRZR temperature -

LESS TliAN 430' F i

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4. Check RCS pressure -

LESS THAN 325 PSIG i

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d. Place low tem ature over pressure l

protectica reli valves in senice i

l IN ACCORDANCE %TUI i

NOP 2.3-4, l

IIOT STANDBY MODE 3 TO COLD l

SliVIDOWN MODE 5 i.

Page 7 of 13

I JUh i

NUMBER TTT12 REY. lSSLTJDATE l

ES.3.3 POST.SGTR COOLDOWN USING STEAM DUMP Rev.2 j

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i STEP ACI10N/ EXPECTED RESPONSE RESPONSE NOT OBTAINED l

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9 CHECK IF RCS COOLDOWN SilOULD BE STOPPED:

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s. Check RCS temperature.
a. RETURN IQ Step 3.

l LESS THAN 300* F i

(277' F FOR ADVERSE l

CONTAINMENT) l t

b. Stop RCS cooldown 10 CHECK RUITURED SG(s)

REFILL RUTTURED SG(s)TO 69 %

l WIDE RANGE LEVEL (s)

USING AUX FEEDWA*I1?R FLOW.

i GREAlliR THAN 63 %

j (67 % FOR ADVERSE IE Er11{ER ONE OF THE i

j CONTAINMEhT)

FOLLOWING CONDITIONS OCCUR,

'I11EN STOP FEEDWATER FLOW TO

]

THE RUITURED SG(s):

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o Ruptured SG pressure (s) decreases in an uncontrolled manner 1

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l o Ruptured SG pressure (s) increases I

l to 935 PSIG.

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JUN 3 1988

.mtBER TIM REY. ISStEDATE ES.3.3 POST.SGTR COOLDOWN USING STEAM DUMP Rev.2 l

1 STEP ACTION / EXPECT 1ED RESPONSE

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RESPONSE NOT OBTANED r

7 CAUTlONt RUPTURED SG(s) PRESSURE SfAY DECREASE RAPIDLY WHEN

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STEASI IS RELEASED.

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NOTEt STEASI RELEASE FROSI RUPTJRED SG(s) AfAY BE STOPPED WHEN RHR IS IN SERVICE.

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I 11 DUMP STEAM FROM l

RUPTURED SG(s):

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a. Sample ruptured SG(s) and prepare a release permit.

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b. Dump steam to the condenser,
b. Manually M Iccally dump steam by performing the following:

using one @ more cf the following:

1. Open the bypass valve amund the o Atmos sheric vent valve.

ruptured SG(s) main steamline o Terry Turbine steam supaly valves. }

trip and non retum valves o Hog Jet steam supply va ves, j

2. MEN pressure is equalized, TilEN open the train steamline trip and non rerum valves

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3. Adjust steam dump controller set point ns necessary 12 CONTROL RCS CIIARGING AND LE1DOWN R.OW TO MAlhTALN i

RCS PRESSURE j

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JUN 3 1988 NUMBER TTT U REY. ISSUE /DATE l

ES 3.3 POST.SGTR COOLDOWN USING STEAM DUMP Rev.2

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i STEP ACTION /EXPECITD RESPONSE RESPONST NOT OBTAISTD NOTE:

THE UPPER HEAD REGION MAY VOID DURING RCS DEPRESSURIZATION IF RCPs ARE NOT RUNNING. THIS MAY RESULT IN A RAPIDLY INCREASING PRZR LEVEL.

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13 DEPRESSURIZE RCS TO htINIhtlZE i

RCS TO SECONDARY LEAKAGE:

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a. Adjust charging and letdown
a. Use altemate letdown to reduce flow to reduce RCS pressure RCS pressure.

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b. Maintain RCS pressure at ruptured SG(s) pressure j

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c. Maintain RCS subcooling based on core exit thermocouples -

l GREATER THAN 32' F (SEE OPPOSIE! PAGE FOR ADVERSE CONTAINMENT) l 1

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14 CHECK IF RCPs MUST BE SHlTIDOWN:

a. Check the following:
a. QQ IQ Step 15.

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o Number 1 seal differential.

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LESS THAN 275 PSIG l

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l o Number 1 sealleakoff flow.

LESS THAN 0.2 GPM

b. Stop affected RCP(s) l l

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JUN 3 1988 NUMBER TTIU REY. ISSUE /DATE ES.3.3 POST.SGTR COOLDOWN USING STE iM DUMP Rev.2 i

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STEP ACMON/ EXPECTED RESPONSE RESPONSE NOT OBTAINED

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L 15 CHECK IF RHR SYSTEM CAN BE PLACED IN SERVICE.

a. Check the following:
a. RETURN IQ Step 10.

l o Check RCS temperature -

i LESS TilAN 300* F t

(277' F FOR ADVERSE CONTAINMENT) i

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o Check RCS pressure -

i.ESS THAN 300 PSIG (t 310 PSIG FOR ADVERSE i

CONTAINMENT) i

b. Place RHR in senice t

IN ACCORDANCE WTU{

i NOP 2.91, r

RHR SYST1LM PLACING SYSTEM i

IN SERVICE f

i 16 CONTINUE RCS COOLDOWN TO t

COLD SHUIDOWN-

a. Maintain cooldown rate in RCS cold legs -

LESS T11AN 100* F / HR I

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b. Use RHR system IE in service
c. Dump steam to the condenser
c. Manually 08 locally durnp steam from intact SG(s) from intact SG(s):

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o Use atmospheric vent valve.

I IE no intact 50 available, TiiEN perform one of the following: I i

o Use faulted SG QR o GOIQ ECA 3.1, SGTR WITH LOSS OF REACIOR COOLAST-SUBCOOLED RECOVERY DESIRED, Step 1.

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JUN a _1gsg NUMBER TTT12

  • REV, lSSLT./DATE l

ES.3.3 POST SGTR COOLDOWN USING STEAM DUMP Rev.2 i

i STEP l

ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED i

17 CHECK RCS EMPERATURE RETURN IQ SEP 10, i

LESS TIIAN 200' F i

18 EVALUAE LONG ERM PLAST i

STARIS:

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a. Maintain cold shutdon conditions
b. Consult plant engineering staff END l

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Page 12 of 13

JUN 3 1988 REY. lSSLT/DATE Rev. 2 i

EQLDOttr EQR Ed SERIES PROCEDURES 1.

S1RElhTT1ATION CRTERIA Manually operate charging 08 SI pumps u necessary, IE either condition listed below occun:

o RCS subcooling based on core esit thermocouples LESS TliAN 32' F.

o PRZR level CANNOT BE MAihTAINED GREATER TilAN 10%

(24% FOR ADVERSE CONTAINMENT).

2.

RED PAT 11

SUMMARY

a.

SUBCRITICALLY. Nuclear power greater than 5%.

b.

CORE COOLING.

Core csit thermocouples greater than 1200' F.

c.

IIEAT SINK.

Wide range level in all SGs less thu 63%

(67% for adverse containment)

AND total feedwater flow less than 320 GPM.

d.

INTEGRITY.

Cold leg temperature decreases greater than 100* F in last 60 mmutes ASD RCS cold leg temperature less than 231' F.

c.

COSTAINMENT.

Containment pressure greater than 40 FSIO.

3.

SECONDA8XINTREGRITY CRTERLA QQ IQ E 2, FAULTED S111AM GENERATOR ISOLATION, Step 1, unless SO is needed for RCS cooldowti, IE either of the following conditions occur.

Any 50 is decreasing in an uncontrolled manner o

AhD has EQI been isolated.

LE o

An SGiscompletelydepressuriaed has EQT been isolated.

4 BUR RECIRCULATION SWITCHOVER CRTERIQN QQ IQ ES 1.3, TRANSFER TO RiiR RECIRCULATION, Step 1, IE RWST level decreases to less than 130.000 gallons.

( LPSI pumps may cavitate IE RWST level is less than 70.000 gallons. )

5.

AM SUPPLY MAKEUP CRITERION Start makeup to DWST before level decreases to 54.000 gallons.

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