05000334/LER-1981-059-03, /03L-0:on 810615,battery Charger Supply to 125-volt Dc Bus 1-2 Lost When Battery Charger 2 Output Breaker Tripped Open.Caused by Excessive Heat in Emergency Switchgear Area.Fan Placed by Charger

/03L-0:on 810615,battery Charger Supply to 125-volt Dc Bus 1-2 Lost When Battery Charger 2 Output Breaker Tripped Open.Caused by Excessive Heat in Emergency Switchgear Area.Fan Placed by Charger

ML20009D775
Person / Time
Site:	Beaver Valley
Issue date:	07/13/1981
From:	Lacey W DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20009D772	List: 05000334/LER-1981-059, Forwards LER 81-059/03L-0 05000334/LER-1981-059-03, /03L-0:on 810615,battery Charger Supply to 125-volt Dc Bus 1-2 Lost When Battery Charger 2 Output Breaker Tripped Open.Caused by Excessive Heat in Emergency Switchgear Area.Fan Placed by Charger
References
LER-81-059-03L, LER-81-59-3L, NUDOCS 8107240335
Download: ML20009D775 (2)

LER-1981-059, /03L-0:on 810615,battery Charger Supply to 125-volt Dc Bus 1-2 Lost When Battery Charger 2 Output Breaker Tripped Open.Caused by Excessive Heat in Emergency Switchgear Area.Fan Placed by Charger

Event date:
Report date:
3341981059R03 - NRC Website

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8 60 61 DOCKET NUMB ER 64 69 EVENT DATE 74 75 RE* ORT DATE 80 EVENT DESCR.PTION AND PRCBABLE CONSEQUENCES h tol2l l On 6/15/81 at 0730 hours0.00845 days <br />0.203 hours <br />0.00121 weeks <br />2.77765e-4 months <br /> with reactor nower at 95"z. the batterv charger supolv to l

125 VDC bus No. 1-2 was. lost when the No. 2 battery charger output breaker tripped j

,3,.j j o ;4; j open. The. charger was declared inoperable while power operat. ion continued within [

the limitations of Technical Specification 3.8.2.3.

The health and safety of the l

[o isI i Io is l l 'public was not jeopardiz;.d as the No. 2 battery remained operational.

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COCE TYPE No.

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33 34 35 36 31 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS li t o l l Excessive heat in the emergency switchgear area caused the breaker to trip on l

li li i l thermal overload. A portable fan was placed in the vicinity of the batterv charnert to cool the breaker. ~At 1120 hours0.013 days <br />0.311 hours <br />0.00185 weeks <br />4.2616e-4 months <br /> the charger was returned to service. Future

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i i l 21 I l i 13 l 'l actions will be to investigate improvements to the ventilation system on the l

I I1 141 l battery charger.

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ko Attachment to LER 81-59/03L Beaver Valley Power Statida-Duquesne Light Company Docket No. 50-334 No further information is available or needed to satisfy the reporting requirement.

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