ML20024E833

LER 83-021/03L-0:on 830720,22,26 & 28,emergency Cooling Sys Loop 11 Taken Out of Svc for Periods Up to 5 H.Caused by Attempt to Reseat Isolation Valve 39-05.Valve Seat Lapped & Loop Returned to svc.W/830819 Ltr

ML20024E833
Person / Time
Site:	Nine Mile Point
Issue date:	08/16/1983
From:	Burgmeier M, Lempges T NIAGARA MOHAWK POWER CORP.
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
LER-83-021-03L, LER-83-21-3L, NMP-7020, NUDOCS 8309070122
Download: ML20024E833 (2)

Text

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DATE 7 8 60 61 DOCKET NUMBER EVENT DATE le EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l o i 2 l lDuring normal operations, the number 11 loop of the Emergency Cooling System was l o 3 j taken out of service for periods up to five hours on July 20, 22, 26 and 28, which l

[o i4 ; lplaced the plant in a degraded mode of operation. However, additional surveillance l io ;3 j gwas performed on the number 12 loop to assure it's operability and the number 11 loop l lnisj lwas returned to service within seven days. Therefore, the safety consequences were l lOI2lIminimal. l 10181 I l 8 9 80 7

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41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l i l 0 l l The loop was taken out of service each time to attempt to reseat isolation valve 39-05l 3 , g which exhibited excessive seat leakage. After these attempts proved unsuccessful, l

, , g the valve seat was lapped during a brief outage, and the loop was returned to service l g,;.,,l upon startup. l l

F1 14 I l 80 7 8 9 STA $  % POWER OTHER STATUS IS O RY DISCOVERY DESCRIPTION TEST RESULTS f8 15l W h l1l0l0]@l NA l W @l l A TIVITY CO TENT RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEAS1 lt ls8 9l W @ Qgl 7 10 tg NA 44 l l 45 NA 80 l

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[TTil8 l90 l 0 l 0 l@l12 7 11 80 LOSS OF OR DAMAGE TO FACillTY '

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9 NAME OF PREPAREft MJ WRG E ER pnone (315) M 4 16 g

e NMP-7020 NIAGARA MOHAWK POWER CORPORATION /300 ERIE BOULEVARD WEST, SYRACUSE, N.Y.13202/ TELEPHONE (315) 474-1511 August 19, 1983 Dr. Thomas E. lkutieg Regional Administrator United States Nuclear Regulatory Comnission Region I 631 Park Avenue King af Prussia, Pennsylvania 19406 RE: Docket No. 50-220 LER 83-21

Dear Dr. Murley,

In accordance with Nine blite Point Nuclear Station Unit #1 Technical Specifications, we hereby submit the following Licensee Eveat Report:

83-21 which is being subnitted .in accordance with Section 6.9.2.b(2), conditions leading .to operation in a degraded mode permitted bu a lixiting condition for operation or plant shktdown required by a finiting conddion for operation.

This report taxs completed in the format designated in NUREG-0161, dated July 1977.

Very ttuty yours, s&

Thomas E. Lempges f

Vice President Nuetear Generation TEL/jm Attachments (3 copies) cc: Director, Office of ISE (30 copics)

Direc. tor, Of fice of MIPC (3 copies)

.Y P

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