ML20038A036

RO 77-17:on 770503,power Supply Unit Failed in Electronic Actuation Circuit of Channel 4 of Reactor Depressurization Sys,Rendering One of Four Blowdown Loops Inoperable.Cause Unknown.Vendor Investigating Cause

ML20038A036
Person / Time
Site:	Big Rock Point File:Consumers Energy icon.png
Issue date:	05/16/1977
From:	CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:
References
RO-77-17, NUDOCS 8109110133
Download: ML20038A036 (1)

Text

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UCENSEE EVENT REPORT Big Rock Point CONTROL SLCCx:I l l l l I l

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7 e si sa es to et 6a es 74 73 eo EVENT OLSCR.9 TON l Failure of a power supply unit in the electronic actuation circuit of Channel 4 of l o.

ao 7 89l the Reactor Deeressurization Systes rendered one of four of the bicudoun loops in-l on og 7 89 Q l orerable. The conditien was automatically alarmed and repairs were c:ade and the l

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@ l unit tested within 6 hoars.*

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7 8 9,1Q 11 12 17 43 44 47 46 CAUSE DESCA@ TON It has been returned to the l

@ l Exact cause of the power supply failure is unknown.

SO 7 89

[ vendor for evaluation of failure mode and repair. Power supply identified is a l

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7 89 P 12 eo PFCASLE CCNSEQUENCES I None,Oniv three channeb are needed to fulfill desten function.

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