ML19274D215

LER 78-066/03L-0 on 781216:during Diesel Generator Surveillance,Diesel Failed to Start.No Exact Cause Found for failure.TD2 Cleaned & Generator Returned to Svc

ML19274D215
Person / Time
Site:	Dresden
Issue date:	01/09/1979
From:	Chan J COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17173A485	List: ML17173A483 ML19274D215
References
LER-78-066-03L, LER-78-66-3L, NUDOCS 7901160282
Download: ML19274D215 (1)

Text

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UJ 61 DOCK E T N U".18 E R M to EVENT DATE 74 M REPCH T OATE CJ EVENT DESCRIPTION AND PROBAGLE CONSECUENCES h o i 2 I l While performing the Unit 2/3 D/G surveillance the diesel failed to start. The air j o,3 l start motors apparently engaged but then disengaged af ter only a few seconds instead j A second attempt to start the diesel was success-l oi. l of the normal 15 second air start.

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l ful. Redundant diesels and all low pressure ECCS systems were tested to be operable.I o c, l Therefore the safety significance of this event was minimal. l l

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cAusE cESCRIPTIO?! AND CCHRECTIVE ACTIONS h i io l No exact caus7 could be found. Time delay relay (TD2), which go wrns the duration of l i 3 air start sequence was cleaned & D/G returned to service af ter operability test.

• g Since similar event occurred on 9/22/78 (LER 78-52-03L-0), TD2 relay and air start l

, ;3 l solenoid vlv. w til be replaced af ter new parts are received and wire connections will he

, , [ checked for tightness. Wkly DG Surv. will be performed for 1 mo. l SO a 9 STA tS *LPOWER oTHER STATUS biSC R DISCOVERY DESCRIPTION i 5 E l@ l 010 l 9 I 5 l@l U3 was shutdown44l [_B.j@lMonthly Surveillan m Test l 7 8 'J 12 l '1 43 46 80 ACTIVI TY CONTENT "

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