05000321/LER-1980-066-03, /03L-0:on 800615,diesel Generator 1C Declared Inoperable When Low Air Pressure Alarm Received W/Reactor in Run Mode.Caused by Valves Failing in Unloaded Mode.Unloader Valves Replaced & Air Receivers Returned to Proper Pressu

/03L-0:on 800615,diesel Generator 1C Declared Inoperable When Low Air Pressure Alarm Received W/Reactor in Run Mode.Caused by Valves Failing in Unloaded Mode.Unloader Valves Replaced & Air Receivers Returned to Proper Pressure

ML19320C037
Person / Time
Site:	Hatch
Issue date:	07/08/1980
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19320C033	List: 05000321/LER-1980-066, Forwards LER 80-066/03L-0 05000321/LER-1980-066-03, /03L-0:on 800615,diesel Generator 1C Declared Inoperable When Low Air Pressure Alarm Received W/Reactor in Run Mode.Caused by Valves Failing in Unloaded Mode.Unloader Valves Replaced & Air Receivers Returned to Proper Pressu
References
LER-80-066-03L-01, LER-80-66-3L-1, NUDOCS 8007150674
Download: ML19320C037 (2)

LER-1980-066, /03L-0:on 800615,diesel Generator 1C Declared Inoperable When Low Air Pressure Alarm Received W/Reactor in Run Mode.Caused by Valves Failing in Unloaded Mode.Unloader Valves Replaced & Air Receivers Returned to Proper Pressure

Event date:
Report date:
3211980066R03 - NRC Website

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y l With the reactor in the run mode, while increasing reactor power, a l

g l" Starting Air Pressure Low" alarm was received for the "lC" Diesel Gen-The "lC" l

g lcrator when the air -eceiver tank pressure fell to 150 psig.

g l Diesel Generator was declared inoperable and the requirements of Technical l

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NARRATIVE

REFORT Georgia Power Company Plant E.

I. Ilatch Baxley, Georgia 31513 Reportable Occurrence Report No. 50-321/1980-066 While increasing reactor power, on June 15, 1980, the Air Receiver Tank pressure fell to 150 pnig on the "lC" Diesel Generator at. which tine a

" Starting Air Pressure Low" alarm was received.

The "lC" Diesel Generator was declared inoperable and the requirements of Technical Specification 4.5.G complied with.

Investigation into the cause of this event revealed Clat the unloaded valves for the "lC" Diesel Air Compressorn were severely corroded, which allowed con ti nuous leakage on the air syst en.

The unloader valves were replaced with new valves and the "1C" Diesel G Generator was then t.ested satisfactorily.

Also, preventive nuintenance procciure limp-1-6450 was revised to provide more froquent inapections of the unloader valves.

This was not a repetitive event nor was there any ef fect:. to cublit htalth and nafety as a result of this incidont.