05000366/LER-1981-036-03, /03L-0:on 810416,diesel Generator 2C Failed to Obtain Rated Voltage Less than or Equal to 12-s Per Fsar. Caused by Field Flash Circuit Failure & Generator Being Excited by Residual Magnetism.Field Flash Relays Ordered

/03L-0:on 810416,diesel Generator 2C Failed to Obtain Rated Voltage Less than or Equal to 12-s Per Fsar. Caused by Field Flash Circuit Failure & Generator Being Excited by Residual Magnetism.Field Flash Relays Ordered

ML19347E707
Person / Time
Site:	Hatch
Issue date:	05/07/1981
From:	Coggin C GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19347E702	List: 05000366/LER-1981-036, Forwards LER 81-036/03L-0
References
LER-81-036-03L, LER-81-36-3L, NUDOCS 8105130253
Download: ML19347E707 (2)

LER-1981-036, /03L-0:on 810416,diesel Generator 2C Failed to Obtain Rated Voltage Less than or Equal to 12-s Per Fsar. Caused by Field Flash Circuit Failure & Generator Being Excited by Residual Magnetism.Field Flash Relays Ordered

Event date:
Report date:
3661981036R03 - NRC Website

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EVENT DATE 14 75 RE POHT DATE 80 EVENT DESCnfPTION AND Pno0ABLE CoNSEoVENCES h I 'l21 lUnit 2 was operatino at rated power.

While performing surveillance for l O a l emergency diesel generator 2C, the generator failed to obtain rated l

l voltage less than or equal to 12sec as required by FSAR table 8.3.3.

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! voltage was obtained in 18 seconds, and the-diesel was available to l

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Followinq a maintenance inspection the surveillance proc-I fiTil ledure was success fully performed, and the di esel was returned to an j

t rial loperable status.

New field flash relays are on order and will be in-l 11141 ls tall ed upon receipt.

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LER f:

50-366/1981-036 l

Licensec:

Georgia Power Company Facility Name:

Edwin I. Ilatch Docket #:

50-366 i

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Narrative

Report for LER 50-366/1981-036 i

On 4-16-81, while Unit 2

was operating at rated

power, surveillance procedurc " Diesel Generator Manual Start," IIN P '

3801, was in progress for dicsc1 2C.

The dicsc1 was manually started, and the generator failed to reach rated voltage in less than 12 seconds as required by PSAR tabic 8.3.3, but was obtained in 18 seconds.

Two subsequent starts were performed for observation, and a

repeat of the same voltage delay occurred although the dicsc1 engine started satisfactorily each time.

Annunciator

" Generator Field Ground" did not momentarily alarm as it usually does during a dicsc1 start indicating the battery system is tied to flash the ficid.

It became apparent residual magnetism provided generator excita-tion.-

4 Diesel 2C was declared inop.

Later following a maintenance inspection, three successful troubicshoot manual starts were performed without voltage delay.

Surveillance procedure

" Diesel Generator Manual Start",

IIN P 3 8 01, was completed satisfactorily and diesel 2C was declared operabic.

This event-is nonrepetitive.

There ucre no effects upon public safety or health.

The apparent cause of field flashing relays to operate was due to effects resulting from motoring the dicsc1 generator during test runs following engine rcpair reported by LER 50-366/1980-159.

New relays arc on order and will replace those in service upon receipt.

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