ML19263C495

LER 79-006/03L-0 on 790120:vital Bus Inverter 3 Failed Resulting in Loss of Voltage on Bus.Caused Reactor to Trip on False Indication of 1C Reactor Coolant Pump Breaker Opening.Failure Caused by Faulty Components in Inverter

ML19263C495
Person / Time
Site:	Beaver Valley
Issue date:	02/20/1979
From:	Werling J DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19263C493	List: ML19263C492 ML19263C495
References
LER-79-006-03L, LER-79-6-3L, NUDOCS 7902260349
Download: ML19263C495 (1)

Text

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NRC' FORM 364 U.S. NUCLEAR REGULATORY COMMISSION tr m LICENSEE EVENT REPORT CONTROL BLOCK:

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(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATIONI o i I 8 9 iP l ALICENSEE lB lV CODE lS l 1 l@l 0 l0 l- l 0LsCENsE to 15 l0 l0NuusEM l 0 l0 l- l0 l 026 l@l4 28 l1uCENsE l1 l1TYPEl1Jol@l57 CAT l 68 l@

CONT o i 7 8 URN60 I L hl61 0 l 5 lDOCK 0 lET0NUMS l 0E Rl 3 l 3 tdll 4 @l 69 0 EVENT l 1l DATE 2l Ol 7 9@l075 l 2 REPORT 74 l 2 l OATE 0 l 7 l 980l@

EVENT DESCRIPTION AND PROBACLE CONSEQUENCES h .

o 2 lAt 1733 hours0.0201 days <br />0.481 hours <br />0.00287 weeks <br />6.594065e-4 months <br />, No. 3 Vital Bus .nverter failed, resulting in loss of voltage on the l o 3 l bus. This caused the reactor to trip on a false indication of the IC Reactor l o 4 l Coolant Pump breaker opening. The vital bus was transferred to its auxiliary l

o 3 lsou'rce and the plant was stabilized. The health and safety of the general public l o e l was nct jeopardized. l B

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40 4l 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS i o l The incident resulted from faulty components in the inverter. The parts were  ;

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NAME OF PREPARER

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