05000321/LER-1981-020-03, /03L-0:on 810318,standby Liquid Control Pump B Discharge Relief Valve 1C41-F029B Lifted Outside Tech Spec. Caused by Setpoint Drift.Valve Reset

/03L-0:on 810318,standby Liquid Control Pump B Discharge Relief Valve 1C41-F029B Lifted Outside Tech Spec. Caused by Setpoint Drift.Valve Reset

ML19347D925
Person / Time
Site:	Hatch
Issue date:	04/07/1981
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19347D923	List: 05000321/LER-1981-020, Forwards LER 81-020/03L-0 05000321/LER-1981-020-03, /03L-0:on 810318,standby Liquid Control Pump B Discharge Relief Valve 1C41-F029B Lifted Outside Tech Spec. Caused by Setpoint Drift.Valve Reset
References
LER-81-020-03L, LER-81-20-3L, NUDOCS 8104140484
Download: ML19347D925 (2)

LER-1981-020, /03L-0:on 810318,standby Liquid Control Pump B Discharge Relief Valve 1C41-F029B Lifted Outside Tech Spec. Caused by Setpoint Drift.Valve Reset

Event date:
Report date:
3211981020R03 - NRC Website

text

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HEPOH f DATE 30 EVENT DESCRIPTION AND PHoD ADLt. CONSEoVENCES h I o I 21 1 During refueling mode while performinq the Standby Liquid Control (SBLC)

I t o 131 1 Pump Operability and Relief Valve Test Procedure, Hf1P-1-3702, the (SBLC)

I l o 14 l l "B" Discharge P.elief Valve, IC41-F029B, lif ted at 1180 psig. The accept-l 10151 I able range is 1325 175 psig per Tech Specs 4.4. A.2.a. The redundant loop l

lo in 1 I "A" was operable. This is a repetitive event as last reported on Report-l Io lil I able Occurrence Report flo. 50-321/1981-006.

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loial l plant operation nor the health and safety of the public due to this event.

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CAUsE DESCRIPTION AND CORRECTIVE ACTIONS li lo l l The cause of the event was setpoint drift on SBLC "B" Relief Valve, IC41-I li lil l F029B. The valve was reset to 1325 r,sia, per SBLC Pump Operability and I

ii i i l Relief Valve Test Procedure HNP-1-3702.

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factorily and returned to service.

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r-LER No.: 50-321/1981-020 Licensee: Georgia Power Company N

Facility: Edwin I. Hatch i

Docket No.: 50-321

Narrative

Report for LER 50-321/1931-020 While in refueling mode and performing the Standby Liquid Control (SBLC)

Pump Operability and Discharge Relief Valve Test, HNP-1-3702, the "B" SBLC Relief Valve, IC41-F0298, operated at 1180 psig.

The acceptable range is 1325 i75 psig per Tech Specs 4.4.A.2.a.

The redundant "A" loop was operable. This is a repetitive event as last reported on Reportable Occurrence Report No. 50-321/1981-020.

There was no effect on safe plant operation nor the health and~ safety of the public due to this event.

The cause of the event was setpoint drift on the '"B" SBLC Discharge Relief Valve,1C41-F0298. The valve was reset to 1325 psig per SBLC Pump Operability and Relief Valve Test Procedure, HNP-1-3702 The system was returned to service and was operable.

The generic review revealed no inherent problems other than setpoint drift.

Work is continuing toward the reduction of the drift problem.

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