05000321/LER-1981-067-03, /03L-0:on 810704,discharge Check Valve E11-F005B Failed to Close After Surveillance Procedure.Caused by Excessive Wear at Point Disc Supported by Disc Hanger.Valve Repaired,Sys Retested & Returned to Svc

/03L-0:on 810704,discharge Check Valve E11-F005B Failed to Close After Surveillance Procedure.Caused by Excessive Wear at Point Disc Supported by Disc Hanger.Valve Repaired,Sys Retested & Returned to Svc

ML20009H638
Person / Time
Site:	Hatch
Issue date:	07/28/1981
From:	Coggin C GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009H633	List: 05000321/LER-1981-067, Forwards LER 81-067/03L-0 05000321/LER-1981-067-03, /03L-0:on 810704,discharge Check Valve E11-F005B Failed to Close After Surveillance Procedure.Caused by Excessive Wear at Point Disc Supported by Disc Hanger.Valve Repaired,Sys Retested & Returned to Svc
References
LER-81-067-03L-01, LER-81-67-3L-1, NUDOCS 8108100311
Download: ML20009H638 (2)

LER-1981-067, /03L-0:on 810704,discharge Check Valve E11-F005B Failed to Close After Surveillance Procedure.Caused by Excessive Wear at Point Disc Supported by Disc Hanger.Valve Repaired,Sys Retested & Returned to Svc

Event date:
Report date:
3211981067R03 - NRC Website

text

NRC FORMgG U.S. NUCLEAR REGULATORY COMMISSION (7-7 71 LICENSEE EVENT REPORT CONTROL BLOCK: l l

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l (PLEASE PRINT OR TYPE ALL REQUIRED InlFORMATION) 1 6

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8 9 LICENSEE CODE 14 15 UCENSE NUM8ER 25 26 UCENSE TYPE JO 57 CAT $8 CON'T lO111 3gg% l L l@l 0l 5 l 0 l 0 l 0 l 3 l 2 l 1 l@l 0 l 7 l 0 l 4 l 8 l 1 l@l 01 71 21 81 8l 1 l@

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60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES g 10121 10n 7-4-81. with the reactor at 2277 MWt. surveillance orocedure RHR Ser-l 1o13llvice Water Pump Operability and Rated Flow, HNP-1-3167, was successfullyl 10141 l completed on pump E11-C0018.

When the pump was stopped the discharae I

lo Isl Icheck valve E11-F005B failed to close.

The pump was declared inoperablel j 1016 I l and Tech Specs surveillance reauirements 4.5.C.2 Derformed.

There were I j 10171 I no ef fects upon Dublic health and safety due to this event.

This is a l j

10181 I nonrepeti tive event.

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1 33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h 11101IThe reason for the valve sticking open was due to excessive wear at the l i i looint the disc is supported by the disc hanaer.

The excessive disc-to-1 It 121l hanger clearance prevented the disc from seating properly.

The valve l-lwas repaired, and the system successfully retested and returned to ser-1 i

a ii piivice.

The unit is now in full compliance, and no further reporting required. l 7

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DISCOVERY DESCRIPTION

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912-367-7851 NAME OF PREPARER pnoug:

LER #:

50-321/1981-067 Licensee:

Georgia Power Company Facility Name:

Edwin I. Hatch Docket #:

50-321

Narrative

Report for I.ER 50-321/1981-067 On 7-4-81, with the reactor at 2277 MWt, the ptimp inservice inspection procedure HNP-1-3167, RHR Service Water Pump Oper-ability and Rated

Flow, was successfully completed on RHR service water pump E11-C001B.

When the pump was stopped the discharge check valve E11-F005B failed to close.

The pump discharge isolation valve E11-F012B was manually closed to prevent reverse flow through the pump when the remaining divi-sional service water pump was started.

The E11-C001B pump was declared inoperable, and Tech Specs surveillance requirements 4.5.C.2 were performed.

The E11-F005B check valve was disas-sembled for inspection and repair.

The reason for the valve sticking open was attributed to excessive wear at the point the disc is suppor ted by the disc hanger.

As the clearance between the disc and the disc hanger increased the disc assumed a position that eventually prevented it from seating correctly t...d e r reverse flow conditions.

The disc and disc hanger have been repaired to original specifications and the valve reassembled and returned to service.

The pump was successfully retested and returned to operable status.

The unit is now in full compli,anca with requirements, and no further reporting is required.

There were no effects upon public health and safety due to this event.

This is a nonrep-etitive event.