ML20204J739

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Rev 3 to Emergency Operating Procedure ES-3.1, Post-Steam Generator Tube Rupture Cooldown Using Backfill
ML20204J739
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-3.1, NUDOCS 8810250239
Download: ML20204J739 (7)
v • d • e


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e JUN 3 1988 butBER TTIE RW. lSSUE/DATE ES 3,1 POST SGTR COOLDOWN USING BACKFILL Rev. 3 l

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A.

PURPOSE This procedure provides actions to cooldown and depressurize the plant to cold shutdown conditions following a steam generator tube rupture. His recovery method depressurizes the ruptured SG(s) by draining it th;ough the ruptured SG tube (s) into the RCS.

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B.

SYMPTOMS OR ENTRY CONDITIONS l

t nis procedure is entered from:

1 1.

E 3, S'EAM GENERATOR 'IVBE RUPTURE, Step 36, i

t if plant staN select < backfill method.

2.

ES 3.2, POST SGTR COOLDOWN USING BLOWDOWN Step 11.

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when blowdown is not availabic and plant staff selects backftl! method.

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JUN 3 1988

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NUMBER TTTU REV. ISStJESATE E S.3.1 POST.SGTR COOLDOWN USING BACKFILL Rev. 3 l

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STEP ACTION /EXPEClED RESPONSE RESPONSE NOT OBTAINED NOTE:

FOLDOUT PAGE SHOUE.D BE OPEN.

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TURN ON PRZR HEATERS AS NECESSARY TO SATURATE PRZR WATT.R AT RUlrRJRED SG(s) i PRESSURE.

4 2

BORATE T1IE RCS FOR COOLDOWN i

L4 ACCORDANCE %TTH SUR 5.319, l

BORATION REQUIREh'ENTS FOR REACTOR SHUTDOW".4 3

VERIFY ADEQUATE SHUTDOWN MARGIN:

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a. Sample ruptured SG(s)

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b. Sample RCS
c. Check shutdown margin. ADEQUATE
c. Borate RCS as necessary.

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7 CAUTION:

MONITOR DWST LEVEL. START MAKEUP TO DWST BEFORE LEVEL DECREASES TO S4,000 GALLONS.

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CIIECK INTACT SG LEVELS:

a. Check wide range levels -
a. Maintain total AUX f-edwater flow GREATER 1 MAN 63 %

greater than 320 GPM until wide (67 % FOR ADVERSE range levelin at least one SG is CONTAINMENT) greater than 63 %

(67 % for adverse contdnment).

b. Control AUX feedwater flow to
b. lE any So wide range level continues i maintain wide range levels between to increase in an uncontrolled manner, 63 % and 69 %

THEN GQ IQ E 3, (67 % and 69 % for adverse S17.AM GENERATOR TUBE containment)

RUI'TURE, Step 1.

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JUN 3 1988 e

a NUMBER 1TTU REY. lSSUEA) ATE

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ES.3.1 POST SGTR COOLDOWN USING BACKFILL Rev.3 l

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STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED NOTEt SINCE RUPTURED SG(s) MAY CONTINUE TO DEPRESSURIZE TO LESS THAN THE MINIMUM RCS PRESSURE NECESSARY FOR CONTINUED RCP OPERATION. COOlDOWN TO COLD SHUTDOWN SHOULD BE COMPLETED AS QUICKLY AS POSSIBLE, NOT TO EXCEED 100*FI HR.

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INTIIATE RCS COOLDOWN TO l

COLD SHUTDOWN:

a. Maintain cooldown rate in RCS cold legs -

LESS 'EAN 100' F / HR

b. Use RHR System ifin senice
c. Dump steam to the condenser
c. Manually OR locally dump steam from intact SG(s) using one QR more of the following:
1. Atmos >herie vent valve.
2. Terry"urbine steam supply valves..
3. Hog Jet steam supply valves.

I IE no intact SG available, AND RHR System EQIin senice, l

IHF.S perform one of the following:

o Use faulted SG DE l

l o QQIQ ECA 3.1, 4

SGTR WTTI! LOSS OF REACT. OR COOLAST-SUBCOOLED RECOVERY j

DESIRED, Step 1.

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JUN 3 1988 NUMBER EU REY. ISSU5DATE

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ES 3.1 POST SGTR COOLDOWN USING BACKFILL Rev.3

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i STEP ACrlON/ EXPECTED RESPONSE RESPONSE NOT OBTA!hTD 6

CHECK RUPTURED SG(s) WIDE REFILL RUFIURE SG(s) TO 69 %

RANGE LEVEL USING AUX FEEDWATER FLOW.

t GREATER TilAN 63 %

(67 % FOR ADVERSE E EmER ONE OF11IE FOLLOWING CONTAINhiEST)

CONDmONS OCCUR.

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TilEN STOP AUX FEEDWATER l

FLOW TO RUI'TURED SG(s):

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Ruptured SG pressure (s) decreases J

in an uncontrolled manner.

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o Ruptured SG pressure (s) i j

inenases to 935 PSIG.

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7 CONTROL CHARGING AhD LETDOWN FLOW TO hiAlhTAIN PRZR LEVEL:

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a. Check PRZR level-
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Increase RCS makeup flow as GREA'ER T11AN 15 %

necess t

(35 % FOR ADVERSE QQTO tep 8.

l CONTAINMENT) i

b. Check PR.ZR level-b.

E PRZR is solid, j

LESS TIIAN 76 %

11iEN control charging and letdoun

( 69 % FOR ADVERSE to maintain RCS pressure.

CONTAINMEhT) l l

E PRZR b'QI solid.

11EN lineup drain header to PDT l

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AND control charging flow to reduce 1

PRZR level.

l 00 T.O Step 11.

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JUN 3 1988 NUMBER TTT12 REY. ISSUE /DATE ES 3.1 POST SGTR COOLDOWN USING BACKFILL Rev.3 I

l STEP ACTION 4XPECTED RESPONSE RESPONSE NOT OBTAINED

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NOTE:

THE UPPCR 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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8 DEPRESSUR172 RCS TO BACKFILL FROM RUPTURED SG(s):

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a. Use nonnal PRZR spray
a. E PRZR is solid, TIIEN control charging and letdown i

flow to maintain RCS pressure.

E PRZR b'QI solid, AND letdown is in senice, THEN use auxiliary spray.

E letdown is HQI En service, IIIES use one PRZR PORV.

b. Turn on PRZR heaters as 4

necessary j

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c. Maintain RCS subcooling based on core exit thermocouples -

GREATER DIAN 32' F

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(SEE OPPOSm! PAGE FOR ADVERSE COSTAINMEST)

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9 CIIECK IF SOLID PLANT CONDITIONS 3

SiiOULD BE ESTABLISIIED:

a. Check PRZR steam phase temperature -
a. Continue RCS cooldown and LESS DIAN 450' F depressurization.

.Wi1ES PRZR temperature is less than 450' F.

BIEN do s:ep 9 b.

b. Increase PRZR level to 100 %

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JUN 3 G88 NUhtBFR 1Tn.E REY. lSSUE/DATE

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ES 3.1 POST.SGTR COOLDOWN USING BACKFILL Rev.3

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STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED NOTE:

o THE SI SYSTEbf AfUST BE DISABLED BEFORE RCS TESIPERATURE IS REDUCEJ BELOW 3]S

  • F.

o IF RUPTURED SG(s) PRESSURE IS GREATER THAN 325 PSIG, ESTABUSH BLOWDOWN ANDIOR VENT STEASI FROSI STEAAf GENERATOR TO REDUCE STEAbt GENERATOR AND RCS PRESSUE.

i 10 PERFORM COLD SHUTDOWN ALIGNh1ENT:

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

LESS Til AN 350* F WHEN core exit thermocouples are less than 350' F.,

11IEN do steps 10 b, e and d.

b. Align core cooling equipment j

IN ACCORDANCE WTDI NOP 2.3-4, HOT STANDBY h10DE 3 TO COLD SHU1DOWN hlODE 5

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AND NOP 2.121 CORE COOLING SYSTEh! LINEUP l

FOR SilUTDOWN AND AT POWT.R I

OPERATION l

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

pressure protection reli:f valves TilEN do step 10 d.

I should be placed in senice:

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1. Check PRZR level. SOLID i
2. Check RCS temperature.

LESS 111AN 325' F l

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3. Check PRZR temErature.

l LESS TriAN 430 F I

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4. Check RCS pressure -

LESS THAN 325 PSIG

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d. Place low temperature over pressure l

m>tection relief valves in senice i

LN ACCORDANCEWTITI NO? 2.3-4, ilOT STANDBY hlODE 3 TO COLD SHUTDOWN htODE 5 Page 6 of 7

JUN 3 1988 NUMBER TTTIE REY. ISSLT. SATE ES 3.1 POST SGTR COOLDOWN USING BACKFILL Rev.3 l

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STEP ACilON/ EXPECTED RESPONSE RESPONSE NOT OBTAINED 11 CIECK IF RHR SYSEM CAN BE l

PLACED IN SERVICE:

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a. Check the following:
a. QQ IQ Step 12.

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o. Check RCS temperature -

l LESS THAN 300* F i

(277' F FOR ADVERSE t

CONTAINMENT) i

o. Check RCS pressure -

i LESS THAN 300 PSIG l

(t 310 PSIG FOR ADVERSE CONTAINhENT)

b. Place RHR in service IN ACCORDANCE WTTH NOP 2.91, RHR SYSTEM PLACING SYSTEM IN SERVICE

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l 12 CHECK IF RCPs MUST BE i

SHlTIDOWN:

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a. Check the following:
a. QQ IQ Step 13.

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o Number 1 seal differential-l f

LESS THAN 275 FSIG 1

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o Number 1 sealleakoff flow -

l LESS THAN 0.2 GPM j

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b. Stop affected RCP(s) f

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l3 CllECK RCS EMPERATURE RETURN IQ STEP 3.

k LESS TRAN 200* F l

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i 14 EVALUATE LONG ERM PLANT STATUS:

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a. Maintain cold shutdown cmditions l-

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b. Consult plant engineering staff t

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