ML17261B089

LER 90-009-00:on 900609,emergency Diesel Generator a Started Automatically & Tied Into Safeguards Buses 14 & 18 Due to Undervoltage.Caused by Inadvertent Closure of 4 Kv Bus 11A Normal Feed Breaker.Breaker reopened.W/900709 Ltr

ML17261B089
Person / Time
Site:	Ginna
Issue date:	07/09/1990
From:	Backus W, Mecredy R ROCHESTER GAS & ELECTRIC CORP.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-90-009, LER-90-9, NUDOCS 9007170277
Download: ML17261B089 (12)

Text

ACCELERATED DEMONST TION SYSTEM DISTRIBUTION REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:9007170277 DOC.DATE: 90/07/09 NOTARIZED: NO DOCKET FACIL:50-244 Robert Emmet Ginna Nuclear Plant, Unit 1, Rochester G 05000244 AUTH. NAME AUTHOR AFFILIATION BACKUS,W.H. Rochester Gas & Electric Corp.

MECREDY,R.C. Rochester Gas & Electric Corp.

RECIP.'NAME RECIPIENT AFFILIATION

SUBJECT:

LER 90-009-00:on 900609,undervoltage on safeguards buses 14

& 18 causes automatic start of EDG A. D W/9 S;

DISTRIBUTION CODE: IE22T COPIES RECEIVED:LTR ENCL SIZE:

TITLE: 50.73/50.9 Licensee Event Report (LER), Incident Rpt, etc.  !

NOTES:License Exp date in accordance with 10CFR2,2.109(9/19/72). 05000244 RECIPIENT COPIES RECIPIENT COPIES D ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PDl-3 LA 1 1 PD1-3 PD 1 1 JOHNSON,A 1 1 INTERNAL: ACNW 2 2 AEOD/DOA 1 1 AEOD/DSP/TPAB 1 1 AEOD/ROAB/DSP 2 2 NRR/DET/ECMB 9H 1 1 NRR/DET/EMEB9H3 1 1 NRR/DLPQ/LHFBll 1 1 NRR/ DLPQ/LPE B 1 0 1 1 NRR/DOEA/OEAB11 1 1 NRR/DREP/PRPB11 2 2 NRR/DST/SELB 8D 1 1 NRR/DST/SICB 7E 1 1 NRR/DST/SPLBSD1 RBG HGNP FTSBl~

FILE OED 01 1

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1 NRR/DST/SRXB 8E RES/DSIR/EIB 1

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1 EXTERNAL: EG&G BRYCE,J.H 3 3 L ST LOBBY WARD 1 1 LPDR 1 1 NRC PDR 1 1 NSIC MAYS,G 1 NSIC MURPHY,G.A 1 1 NUDOCS FULL TXT 1 1 D

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D NOTE TO ALL "RIDS" RECIPIENTS: .

PLEASE HELP US TO REDUCE iVASTE! CONTACT THE DOCUMENT CONTROL DESK, ROOK'I Pl-37 (EXT. 20079) TO ELlb'IINATE YOUR NAliIE FROID'I DISTRIBUTION LISTS FOR DOCUNIENTS YOU DON'T NEED!

FULL TEXT CONVERSION REQUIRED TOTAL NUMBER OF COPIES REQUIRED: LTTR 32 ENCL 32

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$ 1+lC ROCHESTER GAS AND ELECTRIC CORPORATION ~ 89 EAST AVENUE, ROCHESTER, N.Y. 14649-0001 I C E. K 0 H 04C ARCA COOE 7le 546.2700 July 9, 1990 U. S. Nuclear Regulatory Commission Document Control Desk washington,. DC 20555 Subject; LER 90-009, Undervoltage On Safeguards Buses 14 and 18, Causes Automatic Start And Loading Of The "A<<

Emergency Diesel Generator R.E. Ginna Nuclear Power Plant Docket No. 50-244 In accordance with 10 CFR 50.73, Licensee Event Report System, item (a)(2)(iv), which requires a report of, "any event or condition that resulted in manual or automatic actuation of any Engineered Safety Feature (ESF), including the Reactor Protec-tion System (RPS)", the attached Licensee Event Report LER 90-009 is hereby submitted.

This event has in no way affected the public's health and safety.

Ver truly yours, Robert C.

0 Me edy Division Manager Nuclear Production XC: U. S. Nuclear Regulatory Commission Region I 475 Allendale Road King of Prussia, PA 19406 Ginna USNRC Senior Resident Inspector

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<<Assi TILIteeO<<I <<VLISIH Wesley H. Backus ASIA COOl Technical Assistant to the ration COassLITI ONI LINC 101 IACH COaetONIIIT tAILUSC OIIC1ISIO Iss THIS 1IHI11 Ilal 31 5524 -4446 SSA<<vtAC avlrlls ssa<<vtAC cAVIC arsr les COsatON I Nr TVIII1 CAVII COHtONINT TVAI1 t'+T S r 'Cierrrre p~r IUttLCIIIHTALalt01T IataCTIO IIsl ssONTH CAY TCAH CatlCTIO WIIIIISIOH OATI II II Y II Illeea. e<<eesreH MtlcTCO SVIHlsseO<<OA rll <<0 ssaT1*cT lasae<<N INU ssae<<. I A, esarsaseea<<re ee(<<aa asetrsasees tetaereee<<a seeeae llal On June 9, 1990 at 0722 EDST, with the reactor in the hot shutdown condition, the "A" Emergency Diesel Generator started automatically and tied into safeguards buses 14 and 18 due to undervoltage on these buses.

Immediate operator action was to verify that bus 14 and 18 were energized and that the "A" Emergency .Diesel Generator was carrying required loads.

The cause of the undervoltage event wa's the inadvertent: closure of 4EV bus 11A normal feed breaker, tying bus llA to the out-of-service main generator and transformer.,

Immediate corrective action was to reopen the llA normal feed breaker. Further corrective action was to counsel station electricians on proper breaker removal from service and to request training on this subject.

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