05000293/LER-1980-056-03, /03L-0:on 800821, a 125-volt Dc Control Battery on Panel C3 Became Inoperable. Caused by Faulty Electronic Modules in Battery Charger Voltage Regulator.Battery Charger Repaired & Returned to Svc

/03L-0:on 800821, a 125-volt Dc Control Battery on Panel C3 Became Inoperable. Caused by Faulty Electronic Modules in Battery Charger Voltage Regulator.Battery Charger Repaired & Returned to Svc

ML19338E073
Person / Time
Site:	Pilgrim
Issue date:	09/19/1980
From:	Mcloughlin M BOSTON EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19338E072	List: 05000293/LER-1980-056, Forwards LER 80-056/03L-0 05000293/LER-1980-056-03, /03L-0:on 800821, a 125-volt Dc Control Battery on Panel C3 Became Inoperable. Caused by Faulty Electronic Modules in Battery Charger Voltage Regulator.Battery Charger Repaired & Returned to Svc
References
LER-80-056-03L, LER-80-56-3L, NUDOCS 8009240463
Download: ML19338E073 (1)

LER-1980-056, /03L-0:on 800821, a 125-volt Dc Control Battery on Panel C3 Became Inoperable. Caused by Faulty Electronic Modules in Battery Charger Voltage Regulator.Battery Charger Repaired & Returned to Svc

Event date:
Report date:
2931980056R03 - NRC Website

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- LICENSEE EVENT REPORT j

CONTROL 8 LOCK: I l

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l l Ih (PLEASE PRINT CR TYPE ALL REQUIRED INFORMATION)

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7 8 9 LICENSEE COOE 14 15 UCENSE NUM8ER 25 26 LICENSE TYPE JO 57 CA T 58 CON'T M

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8 60 61 DOCKET NUMB ER 68 69 EVENT OATE 74 75 REPORT OATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l o 121 l On August 21, 1980 at approximately 0520 hours0.00602 days <br />0.144 hours <br />8.597884e-4 weeks <br />1.9786e-4 months <br /> an alarm was received on ' A' 125 volt i I o 131 1 DC Control Ratt ery on control room panel C3.

Investigation revealed that the hatterv l lo,,;l charger was inoperable. The backup 125 volt battery charger was placed in service.

l lo isI I The primary 125V

'A' battery charger was repaired and returned to service.

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9 10 11 12 13 18 19 20 SEQUENTIAL OCPURRENCE REPORT REVISION LER EVENT YEAR REPORT NO.

CODE TYPE N O.

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J3 J4 36 31 40 41 42 43 44 47 CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS h l1lol l Electronic modules of the battery charger's voltage regulator were reolaced.

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'6 POWER OTHER STATUS OtS O RY OlSCOVERY DESCRIPTION g l E l@- l 1l 0l 0l@l N.A.

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RELEASED OP RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE li is I LZ_J @ l ZJ@l N.A.

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l PERSONNEt EXPOSURES NUMBER TYPE

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DESCRIPTION

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8 9 11 12 80 LOSS OF OR CAMAGE TO FACILITY TYPE

DESCRIPTION

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10 80 1.3J.oJ LN_f@0ESCRiPriONh NRC USE ONLY

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