U.S. Nuclear Regulatory Commission Operations Center Event Reports For 12/07/94 - 12/08/94 ** EVENT NUMBERS ** 28116 28117 +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 28116 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: SOUTH TEXAS REGION: 4 |NOTIFICATION DATE: 12/07/94 | |UNIT: [1] [ ] [ ] STATE: TX |NOTIFICATION TIME: 14:15 [ET]| |RX TYPE: [1] W-4-LP,[2] W-4-LP |EVENT DATE: 12/06/94 | +------------------------------------------------+EVENT TIME: 13:49[CST]| |NRC NOTIFIED BY: JAIRO PINZON |LAST UPDATE DATE: 12/07/94 | |HQ OPS OFFICER: STEVE SANDIN +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |IAN BARNES RDO | |NINF INFORMATION ONLY | | |NLCO TECH SPEC LCO A/S | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | 1 | N Y 100 POWER OPERATION | 100 POWER OPERATION | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | UNIT 1 BRIEFLY ENTERED TS 3.0.3 FOR 16 MINUTES ON 12/6/94 DUE TO 2 OUT OF 3 | | ESSENTIAL CHILLED WATER SYSTEM LOOPS BEING INOPERABLE FOR MAINTENANCE. | | | | "THE FOLLOWING IS AN INFORMATIONAL CALL ONLY." | | | | "UNIT 1 WAS IN MODE 1 AT 100%, WITH THE ENGINEERED SAFETY FEATURES TRAIN | | "A" INOPERABLE FOR PREPLANNED CORRECTIVE AND PREVENTATIVE MAINTENANCE. | | ENGINEERED SAFETY TRAINS "B" AND "C" WERE OPERABLE." | | | | "DURING WORK PERFORMANCE ON THE ENGINEERED SAFETY FEATURES TRAIN "A", 300 | | TON CHILLER (12A), THE ENGINEERED SAFETY FEATURES TRAIN "C" 300 TON CHILLER | | (12C) WAS INADVERTENTLY TRIPPED DUE TO A LOSS OF CONTROL POWER WHEN AN | | ELECTRICIAN OBTAINED A VOLTAGE READING ON "12C" CHILLER TO COMPARE READINGS | | ON "12A" CHILLER." | | | | "THIS RENDERED TWO OF THREE ESSENTIAL CHILLED WATER SYSTEM LOOPS REQUIRED | | BY TECHNICAL SPECIFICATION 3.7.14 INOPERABLE CAUSING ENTRY INTO TECHNICAL | | SPECIFICATION 3.0.3 (1349 HOURS ON DECEMBER 6, 1994). | | "CONTROL POWER WAS RESTORED TO THE "12C" ESSENTIAL CHILLER. IT WAS STARTED | | AND DECLARED OPERABLE AT 1405 HOURS ON DECEMBER 6, 1994. TECHNICAL | | SPECIFICATION 3.0.3 WAS EXITED AT THIS TIME." | | | | "A LICENSEE EVENT REPORT SUBMITTAL IS PLANNED, BUT THIS NOTIFICATION MAY BE | | WITHDRAWN BASED ON FURTHER REVIEW OF THIS EVENT." | | | | THE LICENSEE INFORMED THE NRC RESIDENT INSPECTOR. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 28117 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: PALISADES REGION: 3 |NOTIFICATION DATE: 12/07/94 | |UNIT: [1] [ ] [ ] STATE: MI |NOTIFICATION TIME: 21:30 [ET]| |RX TYPE: [1] CE |EVENT DATE: 12/07/94 | +------------------------------------------------+EVENT TIME: 19:52[EST]| |NRC NOTIFIED BY: CAINE |LAST UPDATE DATE: 12/07/94 | |HQ OPS OFFICER: BOB STRANSKY +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |JORGENSEN RDO | |AESF 50.72(b)(2)(ii) ESF ACTUATION | | | | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | 1 | N Y 100 POWER OPERATION | 100 POWER OPERATION | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | DURING SURVEILLANCE TESTING OF THE AUXILIARY FEEDWATER (AFW) SYSTEM, AN | | ELECTRICAL COMPONENT FAILED TO KEEP THE AFW CONTROL VALVES CLOSED, CAUSING | | AN UNANTICIPATED INJECTION TO THE STEAM GENERATORS. | | | | DURING A SURVEILLANCE TEST OF THE P-8A (MOTOR DRIVEN) AFW PUMP, THE AFW | | CONTROL VALVES OPENED UNEXPECTEDLY, CAUSING THE AFW SYSTEM TO INJECT | | APPROXIMATELY 165 GALLONS OF WATER TO EACH STEAM GENERATOR. THE MAIN | | FEEDWATER SYSTEM COMPENSATED FOR THE INJECTION AND MAINTAINED NORMAL STEAM | | GENERATOR LEVELS. THE LICENSEE SUSPECTS THAT A CONTACT IN A TEST SWITCH | | FAILED TO ENERGIZE A CIRCUIT WHICH WOULD HAVE INHIBITED THE OPENING OF THE | | VALVES. THE SWITCH HAS TWO CONTACTS, ONE FOR INDICATION LIGHTS, AND ONE | | FOR THE INHIBIT CIRCUIT. THE LICENSEE REPORTED THAT THE LIGHTS FUNCTIONED | | PROPERLY. | | | | THE TEST WAS IMMEDIATELY TERMINATED AND THE AFW SYSTEM RETURNED TO ITS | | STANDBY CONFIGURATION. MAINTENANCE TECHNICIANS WILL TROUBLESHOOT THE TEST | | SWITCH TOMORROW MORNING. THE NRC RESIDENT INSPECTOR WILL BE INFORMED BY | | THE LICENSEE. | +------------------------------------------------------------------------------+