ML20136C394

RO 79-031/01X-0:on 790816,not That Auxiliary Emergency Bus Breakers May Not Open Automatically During Seismic Event. Caused by Design Error.Existing Spare Undervoltage Relays Will Be Used. Control Room Operators Reinstructed

ML20136C394
Person / Time
Site:	Pilgrim
Issue date:	08/16/1979
From:	Mathis C BOSTON EDISON CO.
To:
References
NUDOCS 7909210448
Download: ML20136C394 (1)

Text

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BOSTON EDISON co' frat.*y TEL*' COPY lir.SSAGE Date/ Time 83/16/79

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1000 Talephone Number Di rac t o r.

Region I Prose: Pilgrim Nuclear Power st a r f.in Cffice of Inspectior. sud Enforcement RfD #1 Aocky litit Read U. 5. Nuclear Regselatory Co:re.iss ion Plymniith, MA 02360 631 Park Avenue King of Prussia, PA 19406

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PRO""PT REPORT.tM E OCCt!NCE j

Docket Number 50-293; Lice =w DvF.-.35 Assigned LER Kardner 79-03I/034-0 Buring investigation of

1. th en t in g ac t ivit y problema maaocInted with f.ver/C Descript ton:

che o ta t it.n 34 SKV arv i e cliva a 4 Ie we= 4f= covered that durinu a seiso1e

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eycat (with or without LOCA) the unit aie n t l iary brenW> ras to the erw.r ge.nc y husior. any no t n automat'1cally Tev6 E 'the no rtaal 't r ippi6d TUsirir To iir.T T.E=m trJ T l y qu.Ti t rtti t.mtv -

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wedld result in loan

dcWid no t close.

'of powelr to the emergoney busca he ra u sse tbc dieael venwrator b rea ke rr.

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fautt end Corrective Act.3on*g The cause of this event

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• 19.ve. In that the aux. t r.l p relay f,Asciated with the trip loalc for eenit auxillary Vr'ankirai wor 7 iitIt ' spec t TTed ' Gi he

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j e s Cgi c,a_I ly,quA li f ie d.

A l'DCR i si he i n g_ gene ra t eil tn ist I I I:re axlaieing apare mot mical.Jy jue11fied under voltay.e relaya to t r t;* the innf t sina G i a r v 'li~r'6.iid.W'.~ ~Thiin TTi iiGW U ITr"b***

• c onpj e t ed by Augus t 31, l'879 Control Huom stperatorn hovo been i na t r uc c eel to trip the uva c auxiliary brnaker'i vi thin 16 Tecf.~upnn 'TJ,iiv' *6' neerivel power.

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bit.iLity Statasa:

IM...._I Ther-n1 HV FoutJne Srnrcup p, ) s hos.Ini.n stoutine ShutdoE

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Stendy State X _ _ _ _

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1) nthir f,3cd Changitig j) Plat Applieng.tc fiadten follow-up r e po r t. will be ment within t.uo vecka, foornon notified; Prepa re.1

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e (2) copics to:

De e ee tor Offen of Managenent InfornacInn and Prop,rnn conernt

. U. E. t:ocica r negu la t.ory Core.mir.nion

$A 3 41nr, t o n.

D.C.

20555 7000210

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