ML20009C107

LER 81-009/03L-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

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: ML20009C099 ML20009C107
References
LER-81-009-03L, LER-81-9-3L, NUDOCS 8107200290
Download: ML20009C107 (1)

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me,onvaars 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. Since 3CS-5, the redundant ,.

ieolati'on valve, was already inoperable, the failure of 3CS-6 resulted in loss g, . 7 g, of containment integrity. Theunitwasshutdownwithinthetimeframespecifieq g by the Technical Specifications. Thus, this. incident is considered to be of no g pg77} [ significa~nce'with respect to safe operation, and the health and safety of the 7

_gg si p public were not affected.

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,J@ A L3to !7 i] p@ pg p@ giFlg f 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
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