05000366/LER-1981-017-03, /03L-0:on 810305,recirculation Pump B Failed During Power Changes from 1343 Mwt.Caused by Undervoltage from Exciter of Recirculation Motor Generator Due to Loss of Excitation from Collector Ring & Brush Degradation

/03L-0:on 810305,recirculation Pump B Failed During Power Changes from 1343 Mwt.Caused by Undervoltage from Exciter of Recirculation Motor Generator Due to Loss of Excitation from Collector Ring & Brush Degradation

ML20003E448
Person / Time
Site:	Hatch
Issue date:	03/26/1981
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20003E446	List: 05000366/LER-1981-017, Forwards LER 81-017/03L-0 05000366/LER-1981-017-03, /03L-0:on 810305,recirculation Pump B Failed During Power Changes from 1343 Mwt.Caused by Undervoltage from Exciter of Recirculation Motor Generator Due to Loss of Excitation from Collector Ring & Brush Degradation
References
LER-81-017-03L-01, LER-81-17-3L-1, NUDOCS 8104030485
Download: ML20003E448 (2)

LER-1981-017, /03L-0:on 810305,recirculation Pump B Failed During Power Changes from 1343 Mwt.Caused by Undervoltage from Exciter of Recirculation Motor Generator Due to Loss of Excitation from Collector Ring & Brush Degradation

Event date:
Report date:
3661981017R03 - NRC Website

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lo l3l l "B" Recirculation Pump, 2831-C001B, failed.

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p pq l 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> as per Tech Specs 3.4.1.1., and.was placed in cold shutdown l

l l,, ; l within' 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after the event. This is a repetitive event as last re-l lo lo l i ported on Reportable Occurrence Report No. 50-321/1978-89.

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glT] l effects to public health and safety due to this event.

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LER No.: 50-366/1981-017 Licensee: Georgia Power Company Facility: Edwin I. Hatch Docket No.: 50-366

Narrative

Report

'for LER 50-266/1931-017.

During normal operation while making power changes from 1343 MWt, the "B" Recirculation Pump, 2B31-C001B, failed.

The unit was shutdown within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> per Tech Specs 3.4.1.1., and was placed in cold shutdown within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after the event. This is a repetitive event as last reported on Reportable Occurrence Report No. 50-321/1978-89.

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

The cause of the event was attributed to under voltage fromthe exciter on the Recird ibtor Generator.

This condition was caused by a loss of excitation due to the motor generator exciter collector rings and brush degradation.

The collector rings were repaired and new brushes were installed.

The system was returned to service and operated satisfactorily.

A generic review revealed no inherent problems.

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