ML19270H238

LER 79-020/03L-0 on 790602:during Safety Injection Tank Maint,Safety Injection Tank 22B Decreased to 186 Inches at 1730.Caused by Seat Leakage on 22B Safety Injection Tank Exceeding Leaking Expectations.Valve Will Be Repaired

ML19270H238
Person / Time
Site:	Calvert Cliffs
Issue date:	06/19/1979
From:	Carroll J BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19270H236	List: ML19270H235 ML19270H238
References
LER-79-020-03L, LER-79-20-3L, NUDOCS 7906250273
Download: ML19270H238 (1)

Text

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. LICENSEE EVENT REPORT CC,NTROL BLOCK: l 1

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(PLEASE PRINT OR TYPE ALL REQUIRED INFoRMATION) 7 0 1 8 9 l Ml Ol Cl Cl Nl 2l@l 01 Ol -l OlLICENSE LICENSEE CODE 14 15 Ol Ol NUMBER Ol Ol -l Ol 25QJ@l 26 4LICEN$L l ll 11 Il ll@l' 57 CAT TYPE JO l

58 CON'T A M iL)@l01510101013111Bl@l0161Ol217191@l016l11917l9l@ 69 74 75 REPORT DATE 80 7 8 60 61 DOCKET NUMS ER 68 EVENT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h

1. ,1 o 2 1 Durino cerfonnance of maintenance on SI-661 (SI leakoff return to RCDT).

F5Til I safety injection tank (SIT) 228 level decreased to 186" at 1730. Maintenance l Io lai l on SI-661 was inTnediate1Y susDended and the valve shut allowino SIT 228 to be i ITTTI I refilled at 1750. Three redundant SITS remained filled and operable throuchout l Io is i I this event. This is not a recetitive occurrence. 1 0 7 l l Io la I l I SOI:'E TO$E susCiEE COVPONENT CODE SU8C O'E 5 E 9

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,,, SEQUENTIAL OCCURRENCE REPORT REVISION LE Re RO EVENT YEAR REPORT NO. CODE TYPE N O.

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_ 21 22 23 24 26 27 28 M 30 31 32 N A O ONP NT M HOURS 22 58 i FOR B. SUPPL E MANUPACTURER i33x i@LB_J@ lzi@ LZ_J@ 101010 l lN l@ I42N l@ l43N l@ ll12l017[@

34 35 36 37 4C 41 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS i o l Prior to commencing work on SI-661 all SITS were filled to their hiah limit as some I ii li j i leakage past their drain valves was expected with SI-661 open. The seat leakace I

, 2 l on 228 SIT however exceeded expectations and its level decreased 1.0" below the I i fl l minimum allowed level before SI-661 could be shut. To prevent recurrence of this I L.LL4J l event, 22B SIT drain valve will be reoaired durino the forthcomino refuelino outace. !

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NA l l NA l PERSON ~Et ExPCsOEs NuMsER TYPE oesCRirTiON @

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NAME OF PREPARER PHONE: (301) 234-7943 g 79062507-73