05000293/LER-1979-043-03, /03L-0:on 791108,drywell Unidentified Leakage Rate Exceeded Tech Specs.Caused by Leakage Passing Inboard Isolation Valve MO-2301-4 on HPCI Sys.Valve Backseated & Leakage Reduced to Less than That Requiring Shutdown

/03L-0:on 791108,drywell Unidentified Leakage Rate Exceeded Tech Specs.Caused by Leakage Passing Inboard Isolation Valve MO-2301-4 on HPCI Sys.Valve Backseated & Leakage Reduced to Less than That Requiring Shutdown

ML19262A917
Person / Time
Site:	Pilgrim
Issue date:	12/06/1979
From:	Whitney G BOSTON EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19262A916	List: 05000293/LER-1979-043, Forwards LER 79-043/03L-0 05000293/LER-1979-043-03, /03L-0:on 791108,drywell Unidentified Leakage Rate Exceeded Tech Specs.Caused by Leakage Passing Inboard Isolation Valve MO-2301-4 on HPCI Sys.Valve Backseated & Leakage Reduced to Less than That Requiring Shutdown
References
LER-79-043-03L, LER-79-43-3L, NUDOCS 7912110313
Download: ML19262A917 (1)

LER-1979-043, /03L-0:on 791108,drywell Unidentified Leakage Rate Exceeded Tech Specs.Caused by Leakage Passing Inboard Isolation Valve MO-2301-4 on HPCI Sys.Valve Backseated & Leakage Reduced to Less than That Requiring Shutdown

Event date:
Report date:
2931979043R03 - NRC Website

text

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LICENSEE EVENT REPORT CONTROL BLOCK: l l

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(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6

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8 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DaTE 80 EVENT DESCRIPTION AND iPO8ABLE CONSEQUENCES h O

7 On November 8.

1979-the drvwell un' ionti fied lo,w,co r,co a

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exceeded that allowed by Technical Specification 3.6.C.1.

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4 Investigation was commenced immediately and preparations 1

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were made to conduct an Orderly shutdown.

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8 9 SYSTEM

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40 41 47 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 1

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The cause Of this event uns l o,len en n,cnnd t-h n inkn,vd inn 1,rinn u,1"o l

fOr the HPCI System.

(MO-2301-4).

The valve was backseated and I

leakage reduced tO less than that requiring shutdown and preparations

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fOr shutdown were terminated.

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,ERSONNE L imu'JiES NUMBER

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8 9 11 12 80 LOSS OF OR DAMAGE TO FACILITY TYPE

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