ML20041B232

LER 82-002/03L-0:on 820110,during Full Power Operation,Weld Channel & Penetration Pressurization Sys Air Consumption Exceeded Tech Spec Limits.Caused by Excessive Seat Leakage in Fischer Valve 1192.Valve Removed & Seat Replaced

ML20041B232
Person / Time
Site:	Indian Point
Issue date:	02/09/1982
From:	Hinrichs G CONSOLIDATED EDISON CO. OF NEW YORK, INC.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20041B228	List: ML20041B227 ML20041B232
References
LER-82-002-03L, LER-82-2-3L, NUDOCS 8202230412
Download: ML20041B232 (2)

Text

'NRC FORM 3CG U.S. NUCLEA3 REGULATORY COYMISSION (7-7 0. .

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OATE 4J EVENT DESCnlPTION AND PROBABLE CONSEQUENCES h O 2 l During full power operation it was noted .that Weld channal and I o 3 l Penetration Pressurization System (WCPPS) air consunction was in i o 4 l excess of the Tech. Spec. ( T. S . 3. 3. 0. 2. b) limit of 0.2% of I o 3 g containment volume per day. The excess air leakage was in the weld 1 O s I channel zone that supplies the containment pressure relief valves I o 7 l (1 of 4 separate zones.) The system maintained the required pressure i iois i g and therefore there were no safety consequences. I SYSTEM CAUSE CAUSS COMP. VALVE CODE COCE SUSCODE COMPONENT CODE SUSCODE SUBCOCE 7

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, , , This particular valve is the outermost of three series isolation valves ;

, , in the containment pressure relief line. The yalve was removed and its l

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, , , installed within the time period permitted by the Technical Specificaticins.

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Docket No. 50-247 Consolidated Edison Co. of M.Y., Inc.

LER-82-002/03L-0 Indian Point Unit No. 2 During full power operation it was noted that Weld Channel and Penetration Pressuration System (MCPPS) air consunction was in excess of 0.2% of containment volume oer day (T.S.3.3.

D. 2.b) . The ECPPS continuousiv maintains a pressure in excess of containment design pressure, thereby ensuring that there will be no outleakage of the containment atmosphere via penetrations or velds during an accident. Since the system air pressure was not affected by the increased air consuention, the system would have perforred its intended function.

Since Valve 1192 is the outermost of three valves in series on the 10" containment pressure relief line any leakage through the valve would have been from the UCPP System and not either into or out of containment. The valve was renoved -

and the seat replaced. The valve was then tested satisfactorily and re-installed within the time period permitted by the Technical Specifications.

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