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CLINTON 1 29426 10-06-95 POW LICENSEE: ILLINOIS POWER CO. SITE: .CLINTON 1 . EN NUMBER:29426 DOCKET: 05000461 EVENT DATE: 10-06-95 RX TYPE: BWR EVENT TIME: 11:49 VENDORS: GE-6 NOTIFY DATE: 10-06-95 EMERGENCY CLASS: N/A REGION: 3 STATE: IL TIME: 11:49 OPS OFFICER: JOSEPH SEBROSKY 10 CFR SECTION: CCCC 21.21 UNSPECIFIED PARAGRAPH UNIT SCRAM RX INIT INITIAL MODE CURR CURRENT MODE CODE CRIT PWR PWR 1 N Y 100 POWER OPERATION 100 POWER OPERATION THE LICENSEE ISSUED A 10 CFR PART 21 REPORT DUE TO A PROBLEM WITH A SOLID STATE TRIP DEVICE FOR ELECTRICAL BREAKERS. ON AUGUST 7, 1995, DURING AN ATTEMPT TO SHIFT THE CONTROL ROOM HEATING VENTILATING AND AIR CONDITIONING SYSTEM OPERATION FROM THE A-TRAIN TO THE B-TRAIN, THE B-TRAIN RETURN AIR FAN WOULD NOT START. AN INVESTIGATION FOUND THE FAN'S CIRCUIT BREAKER IN A TRIPPED CONDITION. TROUBLESHOOTING LED TO REPLACEMENT OF THE BREAKER. TESTING OF THE DEFICIENT BREAKER IDENTIFIED THAT ITS SOLID STATE TRIP DEVICE WAS CAUSING THE BREAKER TO TRIP. ILLINOIS POWER OFFICIALS RETURNED THE SOLID STATE TRIP DEVICE TO THE MANUFACTURER FOR FURTHER TESTING. ON AUGUST 21, 1995, ILLINOIS POWER IDENTIFIED ANOTHER POTENTIALLY DEFICIENT SOLID STATE TRIP DEVICE. THIS DEVICE WAS INSTALLED IN THE CIRCUIT BREAKER FOR THE 'B' SWITCHGEAR HEAT REMOVAL SYSTEM CONDENSING UNIT MOTOR. THE BASIC COMPONENTS INVOLVED ARE SOLID STATE TRIP DEVICES, TYPE SS-13, MANUFACTURER PART NUMBER 609901-T012. THE DEVICES WERE MANUFACTURED BY GOULD/ITE (NOW ABB, ASEA BROWN BOVERI). THE LICENSEE DOES NOT INDICATE IN THE PART 21 REPORT THE TOTAL NUMBER OF THIS TYPE OF TRIP DEVICES AT CLINTON OR OTHER NUCLEAR POWER PLANTS. HOWEVER, THE LICENSEE DOES STATE THAT A MODEL SS-13 SOLID STATE TRIP DEVICE IS TYPICALLY INSTALLED ON AUXILIARY POWER 480-VOLT CIRCUIT BREAKERS USED FOR MOTOR CONTROL AT CLINTON.
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