United States Nuclear Regulatory Commission - Protecting People and the Environment

LICENSEE: ROCHESTER GAS & ELECTRIC CORP.
SITE: GINNA 1 EN NUMBER:35731
DOCKET: EVENT DATE: 05-18-99
RX TYPE: PWR EVENT TIME:
VENDORS: W-2-LP NOTIFY DATE: 05-18-99
EMERGENCY CLASS: N/A REGION: 1 STATE: NY TIME: 12:47
OPS OFFICER: STEVE SANDIN
10 CFR SECTION: CCCC UNSPECIFIED PARAGRAPH
UNIT SCRAM CODE RX CRIT INIT PWR INITIAL MODE CURR PWR CURRENT MODE
1 N Y 98 Power Operation 98 Power Operation

DEFICIENT CONTROL RELAYS IDENTIFIED DURING PRE-INSTALLATION TESTING.

ON 4/2/99, THE LICENSEE IDENTIFIED THAT CONTROL RELAYS (NBFD65NR) MANUFACTURED BY EATON CORPORATION CONTAINED A MANUFACTURING DEFICIENCY, I.E., "THE RELAY COIL HAD BEEN INCORRECTLY WIRED SUCH THAT THE INTERNAL RELAY DESIGN, WHICH INCLUDES A PICK UP AND A HOLD COIL, WOULD OPPOSE EACH OTHER AT LOWER VOLTAGES AND PROHIBIT HOLDING COIL ACTUATION WHICH RESULTED IN EXCESSIVE RELAY CHATTER." THIS DEFECT WAS IDENTIFIED DURING PRE-INSTALLATION TESTING PRIOR TO USE IN THE REACTOR TRIP LOGIC. NO DEFICIENT RELAYS ARE INSTALLED.

Page Last Reviewed/Updated Thursday, March 29, 2012