05000293/LER-1980-033-03, /03L-0:on 800701,during Test,Nitrogen Purge Valve Did Not Close within Prescribed 10-s Limit.Cause Not Stated. Stroke Length Reduced,Valve Tested Satisfactorily & Returned to Svc

/03L-0:on 800701,during Test,Nitrogen Purge Valve Did Not Close within Prescribed 10-s Limit.Cause Not Stated. Stroke Length Reduced,Valve Tested Satisfactorily & Returned to Svc

ML19330B632
Person / Time
Site:	Pilgrim
Issue date:	07/30/1980
From:	Mcloughlin M BOSTON EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19330B628	List: 05000293/LER-1980-033, Forwards LER 80-033/03L-0 05000293/LER-1980-033-03, /03L-0:on 800701,during Test,Nitrogen Purge Valve Did Not Close within Prescribed 10-s Limit.Cause Not Stated. Stroke Length Reduced,Valve Tested Satisfactorily & Returned to Svc
References
LER-80-033-03L, LER-80-33-3L, NUDOCS 8008050284
Download: ML19330B632 (1)

LER-1980-033, /03L-0:on 800701,during Test,Nitrogen Purge Valve Did Not Close within Prescribed 10-s Limit.Cause Not Stated. Stroke Length Reduced,Valve Tested Satisfactorily & Returned to Svc

Event date:
Report date:
2931980033R03 - NRC Website

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8 60 6t DOCKET NUMBER 68 69 EVENT OATE 14 75 REPORT OATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h [O la j l On July 1, 1980 while performing PNPS surveillance test No. 8.7.4.3, Nitrogen Purge l l 0131 l Isolation Valve (AO-5033B) did not closewithin its prescribed 10 seconds. The l

lo ;4 ; l valve closed in approximately 19 secords. Maintenance Request No.80-542 was im-l lo IeI l mediately issued for its repair and the valve maintained in its isolated position l

[O is 1 I to satisfy Technical Specification Section 3.7.D.2.

On July 27, 1989 the valve l

l0 l7I I was modified, satisfactorily tested,and returned to service.

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li l0 g l To reduce the closing time of the 4", gate, air operated, isolation valve, A05033B, l

ti [i j l its stroke length was reduced by clamping a split sleeve to its valve stem.

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l percent and its closing time. Post maintenance testing indicated the valve closed j in 8.3 seconds.

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NAME OF PREPARER