ML19208A750

LER 79-065/03L-0:on 790809,battery Charger 2D31 Failed, Rendering Dc Bus a Inoperable.Caused by Dc Output Lamp Socket Burning Up Due to Higher Voltage & Increased Resistance in Circuit.Unit Cleaned

ML19208A750
Person / Time
Site:	Arkansas Nuclear
Issue date:	08/31/1979
From:	Shively C ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19208A735	List: ML19208A734 ML19208A739 ML19208A750 ML19208A757
References
LER-79-065-03L, LER-79-65-3L, NUDOCS 7909170410
Download: ML19208A750 (1)

Text

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s NRC F ORM 36" U. S NUCL E AR RE GUL ATORY COMMISSION (7 77)

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HEPONT D AT E EVENT DESCRIPTION AND PROB AOLE CONSEQUENCES h o 2 IDuring Mode 1 operation, Battery charger, 2D31, failed, rendering the ,

o 2 1"A" DC bus inoperable per T.S.3.8.2.3b. Battery charger, 2D32, remained i o . Ioperable and 2D34 was placed in service, restoring the "A" bus to an i e s loperable status within 10 minutes of the failure detection per i o o IT.S.3.8.2.3b. There have been no similar occurrences. i e , iReportable per T.S.6.9.1.9b.  ;

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JJ g J4 g h t h10 l$"b h i J' 40 el (j 41 lN 44 l l9 lg gj C AUSE DESCR#TICN AND CCRREC flVE ACTiCNS 27) 1 o l Investigation revealed the D.C. Output lamp socket burned up, causing ,

, , ithe output breaker to trip. The failure was caused by higher voltage ,

, , ;, i due to heat and increased resistance in lamp circuit. Dust in the unit ,

,i3 lwas hampering its ventilation. The unit was cleaned and repaired. ,

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