05000366/LER-1980-120-03, /03L-0:on 800811,during Normal Steady State Power Operation,Recirculation Pump 2B Rx Tripped on Low Oil Pressure to Mg Set When Dc Control Power Was Lost to Mg Set Oil Pumps.Caused by Failure to Restore Normal Dc Power

/03L-0:on 800811,during Normal Steady State Power Operation,Recirculation Pump 2B Rx Tripped on Low Oil Pressure to Mg Set When Dc Control Power Was Lost to Mg Set Oil Pumps.Caused by Failure to Restore Normal Dc Power

ML19344E088
Person / Time
Site:	Hatch
Issue date:	08/21/1980
From:	Baxley S GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19344E082	List: 05000366/LER-1980-120, Forwards LER 80-120/03L-0 05000366/LER-1980-120-03, /03L-0:on 800811,during Normal Steady State Power Operation,Recirculation Pump 2B Rx Tripped on Low Oil Pressure to Mg Set When Dc Control Power Was Lost to Mg Set Oil Pumps.Caused by Failure to Restore Normal Dc Power
References
LER-80-120-03L, LER-80-120-3L, NUDOCS 8008260611
Download: ML19344E088 (2)

LER-1980-120, /03L-0:on 800811,during Normal Steady State Power Operation,Recirculation Pump 2B Rx Tripped on Low Oil Pressure to Mg Set When Dc Control Power Was Lost to Mg Set Oil Pumps.Caused by Failure to Restore Normal Dc Power

Event date:
Report date:
3661980120R03 - NRC Website

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REPORT DATE 80 EVENT DESCnlPTION AND PROB ABLE CONSEQUENCES o 2 l During normal sleady state power operation. while maintenante personnel i

Io lal l were investigating the cause-of a DC battery ground on the 2B Station I

l o 141 l Service Batteries, the 2B Rx Recirc Pump tripped on low oil pressure to J

f o lsi i the 14G Set when DC control power was lost to the f4G Set Oil Pumps.

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NARRATIVE

REPORT Georgia Power Company Plant E.I. Hatch P.O. Box 442 Baxley, Georgia 31513 During normal steady state power operation maintenance personnel were investigating the cause of a battery ground on the 2B Station Service Batteries. This was being done by cutting off circuit breakers in DC Cabinet 2R25-5002, and checking each circuit for ground indication.

The normal DC power supply to the 2B Recirc MG Set had had been turned off. This caused transfer of DC control power to the alternate supply.

The power was then turned back on to the norraal supply, however transfer back to nonnal from alternate is a manual transfer, which has to be performed locally at the MG Set. An operator was sent to the local panel to transfer the DC supply back to normal, however before the Operator had perfonned this transfer maintenance personnel turned off the alternate supply breaker. This caused loss of DC control power which caused the AC Oil Pumps to trip which tripped the MG Set on low oil pressure.

Personne, have been cautioned to insure that normal DC power is restored before turning off the alternate supply, when checking for battery grounds in the future. The normal DC power ucs restored and the 2B Recirc MG Set was returned to service. This is a non-repetitive occurrence.

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