ML20031C235

RO 77-15:on 770503,following Component Failure Rendering One Reactor Depressurization Sys Actuation Channel Inoperable, Testing of Remaining Channels Not Done in 4-h.Caused by Faulty Time Assessments.Defective Channel Repaired

ML20031C235
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-77-15, NUDOCS 8110060658
Download: ML20031C235 (1)

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UCENSEE EVENT REPORT Big Ec:k Point

CONTACT BioCicl l l l l-l l~

getsass 988NT ALL RE00Uts0 N6POR40AT10%)

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@CCNT l l l W [ L.J l 0 l 410 l-101115 l 5 l l 0l5l 0f 3l 7 l7 l l 0 l 5 l 1l 6 l 7 l 7l 7 8 57 58 SS 60 61 63 69 74 73 80 EVENT DEscitPTCN

'gl Following co=ponent failure which rendered one of four Reactor Depressurization l

7 89 EO g l-System actuation channels inoperable, testing of the re=aining three channels was l 7 89 80 c'4 l not done in four hours as required by the Technical Specification 4.1.5E.

The de-l 7 89 6C#

@l fective channel was repaired and satisfactorily tested within six hours. The com-l 7 il 9 63 gl ponent failure

• and the specific administrative failure are not repetitive.

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E ISl al_ L*J I zi z i ziziz 'zl LzJ Izlcl9I91 LvJ 7 89 10 11 12 17 43 44 47 48 CAUSE DESCRPT:CN Q l Assessment of the tire involved to return the inoperable channel to service and co:n-l -

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@ lplete the test was in error. The incident has been reviewed with personnel involved l l

7 89 33 10 lemphasizine the necessity to inplament recuired surveillance testinc as soon (Contd).l 63 vace.tv _

wtT.co e, s'ar6s s mwra ovosa status oscovtar cecodiar Dtscartcw h

W l 0I 3l 5l l NA l W l Review of Operations Records l

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t:0 ACIRr4 T COatryNT.

8+EL EAS4D OF *anFa%f AMOUNT c3 acT'vvfY tocate.e C8 a(Liate NA NA l

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PERSONNEL EXPOSUAES PdNd64 STPt O(3 *t.efiCse u 1010101 Lz.J l m, I-

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~12 13 63 PERSONNEL INA A #3 s.uupon C5cR*1C's 8101010 I I na l

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PROBABLE CONSEQUENCES l None - Only three channals are needed to fulfill the design ftmetion.

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7 89-60 LOSS CR CAMAGE TO FACiuTY tvet otscanvCse Lz_I I na l

7 89 10 80 PUBLICITY

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7-89 63 ADDsTIONAL FACTORS b l (C:nuse Descristien - Centd) as possible. *See R0-77-17.

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