ML18142B275

LER 1976-20-00 for R.E. Ginna, Unit 1, on Completion of Monthly Surveillance Test of 1A Emergency Generator (Eg), Operator Opened Bus 14 Breaker from Eg and Received Diesel Generator Supply Breaker Overcurrent Trip Alarm

ML18142B275
Person / Time
Site:	Ginna
Issue date:	07/16/1976
From:	White L Rochester Gas & Electric Corp
To:	O'Reilly J NRC/IE, NRC Region 1
References
LER 1976-20-00
Download: ML18142B275 (6)

Text

0 ps(ZZilsP sszstE ,~'/jZjPi rrsIIZ saws'uzi(>>ROCHESTER GAS AND ELECTRIC CORPORATION I NCT'i~i~OSIS~0/(~-, IIgIC I L o 89 EAST AVENUE, ROCHESTER, N.Y.14649 LEON D.WHITE, JR.VICC PRESIDENT TCLCPHONE A~CA COO@Tia 546-2700 July 16, lll6 Mr.James P.O'Reilly, Director U.S.Nuclear Regulatory Commission Office of Inspection and Enforcement Region I 631 Park Avenue King of Prussia, Pennsylvania 19406

Subject:

Reportable Occurrence 76-20 (14-day report), Bus 14 breaker frord'A Emergency'enerator R.E.Ginna Nuclear Power Plant, Unit No.1 Docket 5fo.50-244

Dear Mr.O'Reilly:

In accordance with Technical Specifications, Article,6.9.2a, the attached report of Reportable Occurrence 76-20, 14-day, is hereby submitted; Two additional copies of this letter and the attachment are enclosed.Very truly yours,~M/Attachment cc: Dr.Ernst Volgenau (40)Mr.William G.McDonald (3) 9 D 4 CONTROL BLOCK: 1 UCEN SEE NAME 1 0 0 14 15~o>N Y R E G 7 89 LER 76-20/1T LICENSEE EVENT REPOR iPLEA8E PRINT ALL REQUIRED INFORMATION) 6 UCENSE EVENT LCENSE NUMBER TYPE TYPE 0 0 0 0 0-0 0 4 1 1 1 1, L0001iI 25 26 30 31 32 REPORT REPORT CATEGORY TYPE SOURCE DOCKET NUMBER EVENT DATE REPORT DATE[QQ~IQQNT~T 1, 0 5 0-0 2 4 4 0 7 0 9 7 6 0 7 1 6 7 6 7 8 57 58 59 60 61 68 69 74 75 80 EVENT DESCRIPTION Qpg On completion of monthly surveillance test of lA Emergency Generator (EG), operator 7 89 80 tOp~]trip alarm.Knowing this alarm was invalid, operator attempted to reset breaker elec-7 8 9 80 tOOI trically with control switch.Alarm did not clear.1B EG was not started.Electrician 7 8 9 80 oreman was notified at once and he immediately went (cont'd.under Additional Factors)7 8 9 PRME SYSTEM CAUSE COMPONENT CODE CODE COMPONENT CODE SUPPLER[QO7I~BE E c K T B R K~N 7 8 9 10 11 12 17 43 CAUSE DESCRIPTION

[QDg ear had occurred on shunt trip alarm switch 80 COMPONENT MANUFACTURER W 1 2 0 Y 44 48 47 linkage preventing breaker to reset elec-7 8 9 80 Jog trically.With the 1B EG running, shunt trip assembly spring tension was increased and 7 89 80 Qpg opened Bus 14 breaker from EG and received Diesel generator supply breaker overcurrent 7 89 4 FACIUTY STATUS POWER~E~10 0 NA 7 8 9 10 12 13 FORM OF ACTIVITY COATENT RELEASEO OF RELEASE AMOUNT OF ACTIVITY 1 2 NA 7 8 9 10 11 PERSONNEL EXPOSURES 7 89 11 12 13 4 PERSONNEL INJURIES NUMBER DESCRIPTION Piij~00 0 NA 7 89 11 12 OTHER STATUS OFFSITE CONSEQUENCES NA METHOD OF DISCOVERY b 44 45 46 44 45 NA DISCOVERY DESCRIPTION NA LOCATION OF RELEASE 7 8 9~10 breaker was operated successfully several times.The (cont'd.on attached sheet)80 80 80 80 80 80 7 89 LOSS OR DAMAGE TO FACILITY TYPE DESCRIPTION H 7 89 10 PUBLICITY 7 89 NA NA 80 80 80 ADDITIONAL FACTORS Q~g (cont'd.from Event Description) to location of breaker to investigate.

He reset 7 89 Q~g breaker manually.(Reportable Occurrence 76-20, 14-day).80 7 89 NAME: j.C.Noon 80 PHQNE.716/546-2700, ext.291-215 GPO 881 667 4"l Licensee Event Report Reportable Occurrence 50-244/76-20 Cause Descri tion (cont'd.)breaker was then returned to service and both EG's returned to standby.The PORC recommended that the alarm response cards be updated to state that the other EG is to be placed in service immediately on notification of one EG or its electrical bus ties being inoperable.

CAR 1084 has been issued to document this corrective action.

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