05000368/LER-1979-065-03, /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

/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: 05000368/LER-1979-063-03, /03L-0:on 790806,containment Atmosphere Sample Reactor Bldg Penetration Outside Isolation Valve 2SV-8263-2 Would Not Indicate Closed During Stroke Test.Caused by Limit Switch Being Out of Adjustment.Limit Adjusted 05000368/LER-1979-065-03, /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 ML19208A734
References
LER-79-065-03L, LER-79-65-3L, NUDOCS 7909170410
Download: ML19208A750 (1)

LER-1979-065, /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

Event date:
Report date:
3681979065R03 - NRC Website

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EVENT DATE J4 75 HEPONT D AT E r0 EVENT DESCRIPTION AND PROB AOLE CONSEQUENCES h 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

2 Ioperable and 2D34 was placed in service, restoring the "A" bus to an i

o loperable status within 10 minutes of the failure detection per i

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IT.S.3.8.2.3b.

There have been no similar occurrences.

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The failure was caused by higher voltage due to heat and increased resistance in lamp circuit.

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The unit was cleaned and repaired.

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