05000321/LER-1981-048-03, /03L-0:on 810702,HPCI Isolated on High Steam Line Flow.Caused by Switch Failure Due to Loss of Internal Damping.Switch Replaced,Recalibr & Returned to Svc.Hpci Proven Operable

/03L-0:on 810702,HPCI Isolated on High Steam Line Flow.Caused by Switch Failure Due to Loss of Internal Damping.Switch Replaced,Recalibr & Returned to Svc.Hpci Proven Operable

ML20009F429
Person / Time
Site:	Hatch
Issue date:	07/02/1981
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009F424	List: 05000321/LER-1981-048, Forwards LER 81-048/03L-0 05000321/LER-1981-048-03, /03L-0:on 810702,HPCI Isolated on High Steam Line Flow.Caused by Switch Failure Due to Loss of Internal Damping.Switch Replaced,Recalibr & Returned to Svc.Hpci Proven Operable
References
LER-81-048-03L-01, LER-81-48-3L-1, NUDOCS 8107310138
Download: ML20009F429 (2)

LER-1981-048, /03L-0:on 810702,HPCI Isolated on High Steam Line Flow.Caused by Switch Failure Due to Loss of Internal Damping.Switch Replaced,Recalibr & Returned to Svc.Hpci Proven Operable

Event date:
Report date:
3211981048R03 - NRC Website

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While the plant was in start-up and attemptina to demonstrate HPCI l

[o [3 l l pump operability at '1.2 MWt, HPCI isolated on high steam line flow.

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Tech Specs 3.5.D.1 requires HPCI to be operable at 2113 psig.

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_J gl ECCS systems were operable.

Plant operation was not affected.

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CAUSE DESCRIPTION AND CORnECTIVE ACTIONS h i o 1 The cause of this event was comnonent failure. HPCI Steam Line D.P. switch.

I li lil i 1E41-N005. failed due to loss of internal dampinn in the Rartnn %11nta.

I l,12i l The switch was replaced. recalibrated and returned to service.

HPCI was I

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The unit is in full compliance with the reauirements.

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NAME OF PHEPAHf H

LER No.: 50-321/1981-048 Licensee: Georgia Power Company Facility:

Edwin I. Hatch Docket No. : 50-321

Narrative

Report for LER 50-321/1981-048.

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On June 5,1981, while the unit was in start-up and hot stand-by and attempting to demonstrate HPCI pump operability at 1.2 MWt reactor power, HPCI isolated on high steam line differential pressure (flow).

Tech Specs Section 3.5.D.1 requires HPCI to be operable at 2113 psig reactor pressure.

Redundant ECCS systems were operable.

Plant operation was not affected by this event.

The health and safety of the public was not a f fected.

This is a repetitive event as last reported on Reportable Occurrence Report No.50-321/1980-108.

The cause of this event was component failure.

HPCI Steam Line D.P. Switch, 1E41-N005, failed due to loss of internal damping in the Barton Bellows.

The differential pressure indicating switch would calibrate properly but was too sensitive to pulsations. The switch was replaced, recalibrated and returned to service. HPCI was proven operable as required by Tech Specs. The unit is now in full compliance with the requirements.

A generic review revealed no inherent problems.

The same type of Barton Flow Switch is used in this application on Unit II. A recently incor-porated Design Change Request which adds a time delay to the HPCI Steam.

Line High Differential Pressure Function should increase the reliabil'ty of the HPCI system.

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