05000366/LER-1981-041-03, /03L-0:on 810426,diesel Generator 1B Declared Inoperable.Caused by Spurious Trip from High Crankcase Pressure Switch W/Generator in Manual Start Mode.Generator Proven Operable & Returned to Svc

/03L-0:on 810426,diesel Generator 1B Declared Inoperable.Caused by Spurious Trip from High Crankcase Pressure Switch W/Generator in Manual Start Mode.Generator Proven Operable & Returned to Svc

ML20004B667
Person / Time
Site:	Hatch
Issue date:	05/21/1981
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20004B663	List: 05000366/LER-1981-041, Forwards LER 81-041/03L-0 05000366/LER-1981-041-03, /03L-0:on 810426,diesel Generator 1B Declared Inoperable.Caused by Spurious Trip from High Crankcase Pressure Switch W/Generator in Manual Start Mode.Generator Proven Operable & Returned to Svc
References
LER-81-041-03L, LER-81-41-3L, NUDOCS 8105290260
Download: ML20004B667 (2)

LER-1981-041, /03L-0:on 810426,diesel Generator 1B Declared Inoperable.Caused by Spurious Trip from High Crankcase Pressure Switch W/Generator in Manual Start Mode.Generator Proven Operable & Returned to Svc

Event date:
Report date:
3661981041R03 - NRC Website

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8 60 61 00CKET NUMdER 68 6W EVENT DATE 14 73 REPORT 0 ATE 80 EVENT oESCRIPTioN AND PROBABLE CONSEQUENCES h O 2 1 With t he unit at steady state power of 2425 MWt, while doing HNP-2-3801, l

Diesel Generator Manual Start, the 1B D/G tripped on high crankcase pres-l 0 3 l sure and was declared inop. Tech Specs 3.8.1.1 requires three ooerable l

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O s i diesel generators. The remaining AC power sources were proven operable l

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34 35 36 31 40 41 42 43 44 47 JJ CAUSE oESCRIPTioN AND CORRECTIVE ACTIONS h s O l The cause of this event has been attributed to a spurious trip from the i

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LER No.: 50-366/1981-041 Licensee: Georgia Power Company Facility: Edwin I. Hatch Docket No.: 50-366

Narrative

Report for LER 50-366/1981-041 On April 26, 1981, with the unit operating at steady state power of 2425 Mut and while performing HNP-2-3801, Diesel Generator Manual Start, the IB diesel generator tripped on high crankcase pressure and was declared inoperative approximately seven minutes after it was started and loaded.

Tech Specs 3.8.1.1 requires three operable diesel generators.

The remaining two diesel generators, D/G 2A and D/G 2C, were quickstarted successfully and two off-site power sources had their breaker lineups checked within one hour. As a result of this event, the unit was placed in a seventy-two hour LC0 status.

The health and safety of the public was not affected by this event. This

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event is repetitive as last reported on Reportable Occurrence Report No.

50-366/1980-067.

The cause of the event has been attributed to a spurious trip from the high crankcase pressure switch while the D/G was in the manual start mode. The vendor previously had proposed the most probable cause was the possibility of condensate.in the crankcase flashing to steam causing a spurious trip, but t

this was not the case. This phenomena would only trip the diesel in the

, manual. mode, it would not trip the diesel when operated in the auto start i

mode. The crankcase high pressure switch was checked and found to operate within acceptable tolerances.

It's sensing line was blown out and the

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switch reconnected and returned to service.

A generic review revealed no inherent problems with this particular type of pressure switch.

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