Part 21 Report - 1996-820
LICENSEE: WESTINGHOUSE ELECTRIC CORPORATION
SITE: WESTINGHOUSE ELECTRIC CORPORAT EN NUMBER:31449
DOCKET: EVENT DATE: 12-13-96
RX TYPE: EVENT TIME: 00:00
VENDORS: NOTIFY DATE: 12-13-96
EMERGENCY CLASS: N/A REGION: 1 STATE: PA TIME: 14:22
OPS OFFICER: LEIGH TROCINE
10 CFR SECTION: CCCC 21.21 UNSPECIFIED PARAGRAPH
MOLDED CASE CIRCUIT BREAKERS WITH INCORRECTLY INSTALLED DC SHUNT
TRIP UNITS AND MISSING SHUNT TRIP BARRIERS
CALLAWAY IDENTIFIED A DEVIATION DURING TESTING OF 6 TYPE HFD3045
AND HFD3060 MOLDED CASE CIRCUIT BREAKERS WITH 125-VOLT DC SHUNT
TRIP DEVICES SUPPLIED AS SAFETY-RELATED BY WESTINGHOUSE. THE
SHUNT TRIP CIRCUITRY IS SPECIFIED TO BE EQUIPPED WITH A CUT-OFF
SWITCH TO REMOVE THE SHUNT TRIP COIL FROM THE POWER SOURCE
SUBSEQUENT TO TRIPPING THE BREAKER. THE COIL IS NOT DESIGNED FOR
CONTINUOUS DUTY AND WOULD EVENTUALLY OPEN THE CIRCUIT IF IT
REMAINED ENERGIZED. THE SHUNT TRIP COIL OF THE BREAKERS SUPPLIED
TO CALLAWAY REMAINED CONNECTED TO THE POWER SOURCE AFTER THE
BREAKER TRIPPED. IN ADDITION, DURING THE EVALUATION OF THE
BREAKERS THAT WERE RETURNED FROM CALLAWAY, IT WAS DETERMINED
THAT
SHUNT TRIP BARRIERS WERE MISSING. THESE BARRIERS PROVIDE
PROTECTION AGAINST DAMAGE DUE TO ARCING. THE VENDOR (CUTLER
HAMMER) DETERMINED THAT 21 BREAKERS WITH EITHER AC OR DC SHUNT
TRIP UNITS (INCLUDING THE 6 REFERENCED ABOVE) HAD BEEN SHIPPED
ONLY TO THE CALLAWAY PLANT. SUBSEQUENT OPERABILITY OF THESE
BREAKERS AFTER A TRIP HAS NOT YET BEEN DETERMINED BY CUTLER
HAMMER.
ALL SIX OF THE BREAKERS WITH INCORRECTLY INSTALLED DC SHUNT TRIP
UNITS HAVE BEEN IDENTIFIED AND ARE IN THE PROCESS OF BEING
RETURNED TO THE VENDOR. WESTINGHOUSE HAS ALSO BEEN INFORMED BY
CALLAWAY THAT ONLY ONE BREAKER WITH A SUSPECT BARRIER IS IN
SERVICE. CALLAWAY DOES NOT PLAN TO PLACE THE REMAINING FOURTEEN
BREAKERS IN SERVICE UNTIL IT IS VERIFIED THAT THE SHUNT TRIP
BARRIERS ARE INSTALLED. SINCE SUBSEQUENT OPERABILITY OF THE
SHUNT TRIP UNITS WITH MISSING BARRIERS IS INDETERMINATE, CALLAWAY
WILL BE ADVISED TO PERFORM A SURVEILLANCE TEST AFTER ANY BREAKER
TRIP DEMAND UNTIL THE BREAKER CAN BE CORRECTED OR REPLACED.
Page Last Reviewed/Updated Wednesday, March 24, 2021