ML17173A316

Forwards LER 78-052/03L-0

ML17173A316
Person / Time
Site:	Dresden
Issue date:	10/19/1978
From:	Stephenson B COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17173A317	List: ML17173A316 ML20027A207
References
BBS-78-1393, NUDOCS 7810270287
Download: ML17173A316 (3)

Text

.;..,.* 1 il ;,...b .., Commonwe. Edison Dresden Nucl.ea er Station R.R. *#1 Morris, Illinois 60450 Telephone 815/942-2920

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BBS Ltr. #78-1393 James G. Keppler., Regional Director Di':rectorate of Regulatory Operations - Region III

p. S .. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 Reportable O'ccurrence Report fl78-052/03L:....o, Docket 11050-237 is hereby submitted to ..*your office in accordance with Dresden Nucl.ear Power Sta.tion Technical Specification 6.6.B~Z. (b), -conditions leading to OP.eration in a degraded mode permitted by a limiting condition for operation or plant shutdown reciuired by a limiting condition for operation.

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fp,*'*B.B. Stephenson

• f v Station Superintendent

• Dresden Nuclear Power Station

.BBS/deb Enclosure*

cc: _Director of Inspection & Enforcement Directorof Management Information & Program Control

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• LICENSE NUMIJER * . 25 26 LICENSE. TYPE :JO 57

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I While performing the Unit 2/3 D/G surveillance the diesel failed to* start. The ait start motors engaged but failed to turn.engine. Asecond attempt to start the diesel!

was successful. The safety significance of this event was minimal because the re-

[Q]IJ I dundant_diesel was operable.

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Probable cause was failure in air start system. Air start solenoid. and timer were I iIIIJ *I *tested 'but fot;lnd normal. . Air start valve insr>ected satisfactorily. *Diesel* .:.-, 1*

ITIIl surveillance interval increased to weekly.for.on:e*month. Air startQsystem will be CID] I modified to. provfde ~~Hip le start attempts. I

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ATTACHMENT TO LICENSEE EVENT REPORT 78-052/03L-0 COM110NlvEALTH EDISON COMPANY (CWE)

DRESDEN UNIT-2 (ILDRS-2)

DOCKET 11050-237 While performing the Unit 2/3 diesel generator monthly surveillance, the diesel failed to start. The air start motors engaged but failed to turn the engine. A second attempt to start the diESel was successful. The safety significance of this event *was minimal because the redundant diesel was operable.

The cause of this event is unknown, but: it is thought to have been caused by a failure in the air start system. The air start solenoid and timer

.were tested but they appeared to be operating normally. Also, the qir start valve was inspected. The valve was disassembled and the internal inspection showed the valve was in satisfa~tory condition. The seais

• were replaced and the valve was reassembled.

The diesel gen~rator. operating surveillance interval has been increased from monthly to weekly for a one month period following the event in order to better determine the cause. There have been five successful starts on this diesel since this event occurred and no failures. Because of the number of starting failures which have. occurred previously as

. a result of failures of the air start motors to properly engage' the station is modifying the air start system. This modification will allow.

automatic restart attempts if the pinion gears fail to properly engage to start the engine. The modification has been designed and approved and the required materials are being purchased. It is expected to be-completed by February, 1979.

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