05000287/LER-1981-009-03, /03L-0:on 810507,containment Isolation Valve 3CS-6 Was Discovered in Intermediate Position,Resulting in Loss of Containment Integrity.Cause Undetermined.Valve 3CS-6 Verified Operable

/03L-0:on 810507,containment Isolation Valve 3CS-6 Was Discovered in Intermediate Position,Resulting in Loss of Containment Integrity.Cause Undetermined.Valve 3CS-6 Verified Operable

ML20009C107
Person / Time
Site:	Oconee
Issue date:	06/05/1981
From:	Jackie Jones DUKE POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009C101	List: 05000287/LER-1981-009, Forwards LER 81-009/03L-0.Detailed Event Analysis Encl 05000287/LER-1981-009-03, /03L-0:on 810507,containment Isolation Valve 3CS-6 Was Discovered in Intermediate Position,Resulting in Loss of Containment Integrity.Cause Undetermined.Valve 3CS-6 Verified Operable
References
LER-81-009-03L, LER-81-9-3L, NUDOCS 8107200290
Download: ML20009C107 (1)

LER-1981-009, /03L-0:on 810507,containment Isolation Valve 3CS-6 Was Discovered in Intermediate Position,Resulting in Loss of Containment Integrity.Cause Undetermined.Valve 3CS-6 Verified Operable

Event date:
Report date:
2871981009R03 - NRC Website

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rs me,onvaars se svawrossemetion Asso pnosaan.s consecuencas gI On May 7, 1981, containment isol ion valve 3CS-6 was discovered, during~a contgol room tour, to be in the intermediate position.

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,J@ L3to !7 i] p@ pg p@ giFlg A f cause ossemrTson 4,ec ccJimeenva acnoms. @ tigogg The apparent cause of the failure of 3CS-6 was not determined at that time. , However, following the failure which occurred on May 19, 1981, it was determined L! J 2 L *, that valves 3CF-22 and 3CF-23 were leaking past the seat and valve 3CS-124 I

was " gagged" closed.

For the 5-7-81 event, 3CS-5 was repaired and 3CS-6 ver-ified operable. Modifications were performed for the 5-19-81 event. U-1 and U-2 identical relief val w g bg inspected. es, [- Operator E e'"y W b liisI hl@ l1l 0[gl 7 y e ,ggr,,,,, is is =aee - @ l i.e.,,,o,. . a - -ooa u _I Ie I ( Z ldQl l NA g NA

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