ML19273B464

LER 1-77-115 on 771209:during ECCS Timing Sequence Test, Diesel Generator 3 Failed to Meet 10-s Criteria by 0.1 to 0.2-s.Caused by Air Starting Valve on Left Bank Cylinder Sticking Shut Due to Carbon Buildup

ML19273B464
Person / Time
Site:	Brunswick
Issue date:	01/06/1978
From:	Banks H CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19273B460	List: ML19273B459 ML19273B464
References
LER-1-77-115, NUDOCS 7904060464
Download: ML19273B464 (2)

Text

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60 61 DOCKET NUMBER 68 89 EVENT DATE EVENT DESCRIPTION AND PROBABLE CON

,EQUENCES h

}lDuring perfortnance of the ECCS Timine Sequence Test (LOGIC), Diesel Generator #3 1 l l was starting and loading satisfactorily, but was failing to meet the 10 second criterit j l by 0.1 to 0.2 seconds. (Technical Specification 3.5.F)

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CAUSE DESCRIPTION AND CORRECTIVE ACTION:,

l ll An sir 9tartine valve on one of the left bank evlinders was found to be stuck shut i

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]I dua to carbon builduo. This prevented the evlinder from receivine startine air

]I pressure and caused the diesel to take slichtiv loneer (see attached).

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. 9 OTHER STATUS Dis R OtSCOVERv DESCRIPTION

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l l B l@l ECCS Tertting

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_. .Loss 0, OR DAMAGE ii TO FACILITY TYPE

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.'A LER C0hTINUATION -- RO#/-77-ll5 Facility: BSEP Unit #1 Even* Date 12-9-77 Cerrective Action:

To Start.

W e valve was soaked in solvent and stroked several times to free it up and dissolve the carbon deposits. All other air start valves were checked and verified to be operable.

Re preventative maintenance inspection instruction for the diesel generators will be revised to include a section on verification of the operability of the air start valves.

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