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)

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L ROCHESTER GAS AND ELECTRIC CORPORATION o 89 EAST AVENUE, ROCHESTER, N.Y. 14649 LEON D. WHITE, JR. TCLCPHONE VICC PRESIDENT 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 LER 76-20/1T CONTROL BLOCK:

4 LICENSEE EVENT REPOR iPLEA8E PRINT ALL REQUIRED INFORMATION) 1 6 UCEN SEE UCENSE EVENT NAME LCENSE NUMBER TYPE TYPE

~o> N Y R E G 1 0 0 0 0 0 0 0 0 0 4 1 1 1 1, L0001iI

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7 89 14 15 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 Qpg opened Bus 14 breaker from EG and received Diesel generator supply breaker overcurrent 7 89 80 tOp~] trip alarm. Knowing this alarm was invalid, operator attempted to reset breaker elec-7 8 9 tOOI trically with control switch. Alarm did not clear. 1B EG was not started. Electrician 80 7 8 9 oreman was notified at once and he immediately went (cont'd. under Additional Factors) 80 7 8 9 PRME 80 SYSTEM CAUSE COMPONENT COMPONENT CODE CODE COMPONENT CODE SUPPLER MANUFACTURER

[QO7I ~BE E c K T B R K ~N W 1 2 0 Y 7 8 9 10 11 12 17 43 44 47 48 CAUSE DESCRIPTION

[QDg ear had occurred on shunt trip alarm switch 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 8 9 80

~10 breaker was operated successfully several times. The (cont'd. on attached sheet) 7 89 4 80 FACIUTY METHOD OF STATUS POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION

~E ~10 0 NA b NA 7 8 9 10 12 13 44 45 46 80 FORM OF ACTIVITY COATENT RELEASEO OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE 1 2 NA NA 7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES 7 89 11 12 13 4 80 PERSONNEL INJURIES NUMBER DESCRIPTION Piij ~00 0 NA 7 89 11 12 80 OFFSITE CONSEQUENCES NA 7 89 80 LOSS OR DAMAGE TO FACILITY TYPE DESCRIPTION H NA 7 89 10 80 PUBLICITY NA 7 89 80 ADDITIONAL FACTORS Q~g (cont'd. from Event Description) to location of breaker to investigate. He reset 7 89 80 Q~g breaker manually. (Reportable Occurrence 76-20, 14-day) .

7 89 80 NAME: j.C. Noon PHQNE. 716/546-2700, ext. 291-215 GPO 881 667

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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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