ML19345E978

LER 81-001/03L-0:on 810105,while Placing Standby Gas Treatment Sys B in Normal Shutdown Lineup,Discharge Valve MO-1/2-7507B Failed to Close When Operated from Control Room.Caused by Worn Breaker Auxiliary Contacts

ML19345E978
Person / Time
Site:	Quad Cities
Issue date:	01/20/1981
From:	Soden R COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19345E977	List: ML19345E976 ML19345E978
References
LER-81-001-03L-01, LER-81-1-3L-1, NUDOCS 8102060480
Download: ML19345E978 (1)

Text

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LICENSEE EVENT REPORT

, - CONTRot stocx: l l l l l l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATIONI l 0 l 8t 3l l l l UCENSEE

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L! QlCODE A l D l L l@l 14 iS 0 l 010 LICENSE l - l0NLMSER l 0 l0 l- l0 l0 l0 23 l@l 26 4lLICENSE ll 1] TYPE 1l 1l@l J0 l

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ORT D ATE 8!J 7 8 60 61 OOCKET NLYSER 68 EVENT OATE EVENT DESCRIPTION AND PROSABLE CONSEQUENCES O'c io l2l l At 9: 10a.m.whileplacingthe"B"StandbyGasTreatmerjysteminano'r' mal: hut- l

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down line-up, discharge valve MO-l/2-7507B failed to close when operated from the  ;

o ;,; ; Control Room. The "A" Standby Gas Treatment System was demonstrated operable in  ;

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accordance with Technical Specification 3 7.B.a. and was fully capable of  ;

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maintaining a negative reactor building differential pressure had the need arisen. y

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42 43 44 47 CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS h l1 foil Upon investigation it was discovered that the breaker auxiliary contacts were worn I li li l l and stickinO; thus preventing valve MO-1/2-7507B from closing. The contacts were I i, t 21 l replaced with contactor kit 500ci7 and the valve was tested satisfactorily. The 1

[i13l l "B" Standby Gas Treatment System was returned to service at 1: 30 p.m. on January l-ii14i l 5, 1981. I 80 1 8 9 ST S  % POWER OTHER STATUS is O RV OtSCOVERY OESCRIPTION Ii i s 1 [E_J@ l' 0 l 8 l 4' l@l" NA l l A [@l Operational Event l

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Activity CCRTENT RELEASEO OF RELE ASE AMOUNT OF ACTivtTY LOCATION OF RELEASE

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10 44 45  %)J 7 9 ti PERSONNEL EXPOSURES NUN'8 E R TYPE DE SCRt

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' ' ' ,ERSONNet'iN;ueS Nu mR DESCRiP r>ON @ NA l li b l9 10 7 9 l 0 l0 l@l 13 12 80 LOSS OF OR O AMAGE TO FACILtTY TYSE CESCRIPTION NA l l1 l 94 l l Z l@lto 1 'A 30 OE CRIPTION f IS30E i > u l l N iSi NA l lllllllll!!l!i

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