United States Nuclear Regulatory Commission - Protecting People and the Environment

LICENSEE: ROCHESTER GAS & ELECTRIC CORP.
SITE: GINNA 1 EN NUMBER: 36261
DOCKET: EVENT DATE: 10-05-99
RX TYPE: PWR EVENT TIME: 08:54
VENDORS: W-2-LP NOTIFY DATE: 10-05-99
EMERGENCY CLASS: N/A REGION: 1 STATE: NY TIME: 08:54
OPS OFFICER: JOHN MacKINNON
10 CFR SECTION: CCCC UNSPECIFIED PARAGRAPH
UNIT SCRAM CODE RX CRIT INIT PWR INITIAL MODE CURR PWR CURRENT MODE
1 N Y 100 Power Operation 100 Power Operation

W2 SWITCH SUPPLIED BY WESTINGHOUSE DRAWN FROM STOCK DID NOT OPERATE PROPERLY AFTER BEING INSTALLED.

W2 SWITCH WAS SUPPLIED TO ROCHESTER GAS AND ELECTRIC CORPORATION BY WESTINGHOUSE ELECTRIC CORPORATION. A SAFETY RELATED W2 SWITCH DRAWN FROM STOCK DID NOT OPERATE SATISFACTORILY AFTER BEING INSTALLED IN THE MAIN CONTROL BOARD FOR USE AS THE CONTROL SWITCH FOR SAFETY INJECTION PUMP 1C (1/SIP1 C2). THE SWITCH DID WORK PROPERLY BEFORE INSTALLATION IN THE MAIN CONTROL BOARD POSITION. HOWEVER, SUBSEQUENT TO INSTALLATION THE SWITCH MECHANISM WOULD BIND AND WOULD NOT SPRING RETURN TO THE "AFTER CLOSE" OR "AFTER TRIP" POSITIONS. THE SWITCH IS EXPECTED TO FUNCTION PROPERLY IN BOTH POSITIONS.

THE SUBSTANTIAL SAFETY HAZARD CREATED BY THE SWITCH POTENTIALLY BEING STUCK IN THE "TRIP" POSITION IS THAT THE ASSOCIATED ECCS PUMP BREAKER WOULD NOT AUTO-CLOSE FOLLOWING A SAFETY INJECTION ACTUATION SYSTEM SIGNAL; THEREFORE, THE ASSOCIATED ECCS PUMP WOULD NOT PERFORM ITS SAFETY FUNCTION. THE POSTULATED FAILURE, IN CONJUNCTION WITH ANOTHER POSTULATED SINGLE FAILURE, COULD CAUSE A LOSS OF SAFETY FUNCTION FOR THE ECCS SYSTEM.



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