ML20028E985

LER 83-002/01T-0:on 830105,during Mode 1,while Performing Leak Checks,Tap Isolation Valve 3-1299-13 & Pipe Cap Found Blowing Steam.Cause Unknown.Pipe Threads Chased & New Cap Installed.Valve Will Be Replaced During Next Refueling

ML20028E985
Person / Time
Site:	Dresden
Issue date:	01/14/1983
From:	Rhee S COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20028E980	List: ML20028E979 ML20028E985
References
LER-83-002-01T, LER-83-2-1T, NUDOCS 8301280320
Download: ML20028E985 (2)

Text

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EVENT otsCMIPTION AND PMotASLE CONSEQUENCis 10 gl During normal unit operation, while erforming leak checks, the tap isolation valve -

m, , (3-1299-13) and pipe cap found to be blowing steam. The system was immediately iso-

,,g,g lated to stop the leakage. The safety significance was minimal since all leakage ,

g , was contained in the Rx building floor drain system. The health and safety of the

,,,,,; public was not affected. Previous similar occurrence reported by R.O. 82-58/03L-0, ga,7l l Docket 050-237.  ;

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, , , a , l The cause of the valve leaking is@ unknown at this time.

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,,,,,ja new cap installed. The test connection will be modified by adding second isolation, g and the existing valve will be replaced during the next refueling outage. The leak , 3 l ing valve will be examined in o'rder to determine the mode of failure, g 11 11 l l 4N 4powem orwemsrArus ossc R Operator oescoVERY Inspection oESCR8PftoM h ii i s i LEj@ l 0 l 9 l 9 l@l N/A l Qg . l 7

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i ATTACHMENT 70 LICESEE EVET REPORT 83-02/01T-0 CDt0NWEALTH EDISCN C04PANY (CWE)

DRESDEN UNIT - 3 (1IERS - #3)

D00TT #050 - 249 During unit normal operation, while perfonning leak checks, '

the equi; ment cperator found small steam leaking fran the test tap valve (3-1299-13, 3/4") .. The systm was i===iiately isolat-ed to stop the leakage. The safety significance was minimal since all the leakage was contained in the reactor building floor drain systs.

Tha cause of the valve leaking is unknown at this time.

The pipe threads chased and a new cap installed. The test connection will be modified by adding second isolation and the existing valve will be replaced during next refueling outage. The leaking valve will be ex=inad in order to de-termine the mode of failure.

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