ML19242D356

LER 79-021/01T on 790726:meggar Readings Indicated Degradation of Insulation Resistance During Testing of Emergency Bus GE Transformers.Cause Not Stated. Transformers Replaced W/Qualified Ite Transformers

ML19242D356
Person / Time
Site:	Beaver Valley
Issue date:	08/09/1979
From:	Werling J DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19242D353	List: ML19242D352 ML19242D356
References
LER-79-021-01T, LER-79-21-1T, NUDOCS 7908140828
Download: ML19242D356 (1)

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EVENT DESCRIPTION AND PROSA8LE CONSEQUENCES h ITTil i During testing of the Emergency Bus 4160V/480V Ceneral Electric Transformers. meener I

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5 l readings indicated a significant degradation of the insulation resistance as compared l 0 4 l to the original acceptance testing. I EI I

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36 31 40 42 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i o l All four transformers on the emergency buse ; have been replaced with properly [

gl qualified ITE transformers which were available on-site to improve reliability. l Fi'TTl i I 1113] I I AI .

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