U.S. Nuclear Regulatory Commission Operations Center Event Reports For 11/22/95 - 11/24/95 ** EVENT NUMBERS ** 29480 29502 29635 29636 !!!!!!!!! THIS EVENT HAS BEEN RETRACTED. THIS EVENT HAS BEEN RETRACTED !!!!!!! +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 29480 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: COOK REGION: 3 |NOTIFICATION DATE: 10/20/95 | |UNIT: [1] [ ] [ ] STATE: MI |NOTIFICATION TIME: 01:31 [ET]| |RX TYPE: [1] W-4-LP,[2] W-4-LP |EVENT DATE: 10/20/95 | +------------------------------------------------+EVENT TIME: 00:35[EDT]| |NRC NOTIFIED BY: BRYAN MUTZ |LAST UPDATE DATE: 11/22/95 | |HQ OPS OFFICER: RUDY KARSCH +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |THOMAS BURDICK RDO | |ADEV 50.72(b)(1)(i)(B) DEVIATION FROM T SPEC | | |NLCO TECH SPEC LCO A/S | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | 1 | N N 0 HOT STANDBY | 0 HOT STANDBY | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | ENTRY INTO TECH SPEC 3.0.3 DUE TO NOT COMPLETING THE ACTION STATEMENT OF | | TECH SPEC 3.7.1.5 PRIOR TO THE EXPIRATION OF THE TIME LIMIT. | | | | UNIT 1 ENTERED MODE 3 AT 0117 EDT ON 10/18. TECH SPEC 3.7.1.5 REQUIRES | | THAT EACH STEAM GENERATOR STOP VALVE SHALL BE OPERABLE AT MODE CHANGE. WITH | | ONE OR MORE VALVES INOPERABLE, THE INOPERABLE VALVE MUST BE VERIFIED CLOSED | | WITHIN 8 HOURS OR RETURN TO MODE 4. CONTRARY TO THE TECH SPEC | | REQUIREMENTS, THE VALVES WERE NOT OPERABLE AT THE TIME OF THE MODE CHANGE | | ON 10/18, AND WERE NOT TESTED UNTIL 10/20, LONG AFTER THE EXPIRATION OF THE | | 8-HOUR TIME LIMIT. THE VALVES HAVE NOW PASSED APPLICABLE TESTS AND ARE | | OPEN. ALL TECH SPEC LCOs HAVE BEEN EXITED. THE LICENSEE WILL INFORM THE | | NRC RESIDENT INSPECTOR. | | | | * * * UPDATE AT 1325 EST ON 11/22/95 FROM WEST TAKEN BY KARSCH * * * | | | | THE LICENSEE IS RETRACTING THIS EVENT BECAUSE A CONDITION OUTSIDE THE | | DESIGN BASIS DID NOT EXIST. BASED ON THE LICENSEE'S UNDERSTANDING OF THE | | TECH SPEC, THE IMPOSED EIGHT-HOUR TIME LIMIT FOR OPERABILITY TESTING OF THE | | MAIN STEAM STOP VALVES DOES NOT APPLY WHEN THE REACTOR COOLANT SYSTEM | | TEMPERATURE IS BELOW 540øF. THE SURVEILLANCE MUST BE COMPLETED WHEN THE | | REACTOR COOLANT SYSTEM TEMPERATURE EXCEEDS 540øF AND BEFORE ENTERING MODE | | 2. THE LICENSEE INFORMED THE NRC RESIDENT INSPECTOR. R3DO (CLAYTON) | | NOTIFIED. | +------------------------------------------------------------------------------+ !!!!!!!!! THIS EVENT HAS BEEN RETRACTED. THIS EVENT HAS BEEN RETRACTED !!!!!!! +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 29502 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: DIABLO CANYON REGION: 4 |NOTIFICATION DATE: 10/24/95 | |UNIT: [1] [ ] [ ] STATE: CA |NOTIFICATION TIME: 19:30 [ET]| |RX TYPE: [1] W-4-LP,[2] W-4-LP |EVENT DATE: 10/24/95 | +------------------------------------------------+EVENT TIME: 16:10[PDT]| |NRC NOTIFIED BY: BRAD HINDS |LAST UPDATE DATE: 11/22/95 | |HQ OPS OFFICER: JOSEPH SEBROSKY +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |LINDA HOWELL RDO | |AIND 50.72(b)(2)(iii)(D) ACCIDENT MITIGATION | | | | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | 1 | N N 0 REFUELING | 0 REFUELING | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | NON-SEISMICALLY QUALIFIED RELAYS WERE FOUND TO BE INSTALLED IN UNIT 1's | | UNINTERRUPTIBLE POWER SUPPLIES. | | | | ON OCTOBER 17, 1995, IT WAS DISCOVERED THAT OMRON RELAYS INSTALLED IN UNIT | | 1'S VITAL UNINTERRUPTIBLE POWER SOURCES (UPS) WERE NOT TESTED AND VERIFIED | | TO BE SEISMICALLY QUALIFIED. THE UPSs WERE RECEIVED FROM THE VENDOR IN THIS | | CONFIGURATION AND INSTALLED DURING THE UNIT'S SIXTH REFUELING OUTAGE IN | | MARCH OF 1994. DURING A DESIGN BASIS SEISMIC EVENT CONCURRENT WITH A LOSS | | OF OFFSITE POWER EVENT, THE OMRON RELAYS COULD HAVE CHATTERED. THE RELAY | | CHATTER COULD HAVE CAUSED THE STATIC SWITCH OF THE UPS TO TRANSFER TO A | | DEAD BYPASS POWER SOURCE FOR APPROXIMATELY 10 SECONDS UNTIL THE EMERGENCY | | DIESEL GENERATORS LOAD AND THE BYPASS SOURCE IS RE-ENERGIZED. THIS | | CONDITION WOULD RESULT IN A LOSS OF POWER TO THE 120-VOLT VITAL INSTRUMENT | | AC BUSSES. THE VITAL UPS AND THE VITAL INSTRUMENT AC SYSTEM PROVIDES | | UNINTERRUPTIBLE, REGULATED, 120-VOLT, AC POWER TO NUCLEAR SAFEGUARD | | FUNCTIONS, REACTOR PROTECTION ACTUATION, CONTROL INDICATION, AND OTHER | | SAFETY-RELATED SYSTEMS. | | | | ALL FOUR UNIT 2 VITAL UPSs HAVE BEEN INSPECTED TO CONFIRM THAT SEISMICALLY | | QUALIFIED RELAYS WERE INSTALLED. IN ADDITION, SEISMICALLY QUALIFIED RELAYS | | HAVE BEEN INSTALLED IN ALL OF UNIT 1'S UPSs. | | | | ON OCTOBER 24, 1995, THE LICENSEE DETERMINED THAT THIS WAS A CONDITION THAT | | ALONE COULD HAVE PREVENTED THE FULFILLMENT OF THE SAFETY FUNCTION OF THE | | SAFETY SYSTEMS THAT ARE NEEDED TO MITIGATE THE CONSEQUENCES OF AN ACCIDENT. | | | | THE LICENSEE WILL INFORM THE NRC RESIDENT INSPECTOR. | | | | * * * UPDATE AT 1456 EST ON 11/22/95 FROM MAGRUDER TAKEN BY KARSCH * * * | | | | THE LICENSEE (PG&E) COMPLETED SEISMIC TESTING OF THE OMRON RELAYS ON | | 11/17/95. THEY DETERMINED THAT THE RELAYS WOULD HAVE PERFORMED THEIR | | INTENDED SAFETY FUNCTION DURING A DESIGN BASIS EVENT. SINCE THE RELAYS | | WOULD HAVE FULFILLED THEIR SAFETY FUNCTION, THE LICENSEE IS RETRACTING THIS | | EVENT. THE LICENSEE INFORMED THE NRC RESIDENT INSPECTOR. R4DO (BARNES) | | NOTIFIED. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 29635 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: COOK REGION: 3 |NOTIFICATION DATE: 11/22/95 | |UNIT: [1] [ ] [ ] STATE: MI |NOTIFICATION TIME: 17:10 [ET]| |RX TYPE: [1] W-4-LP,[2] W-4-LP |EVENT DATE: 09/12/95 | +------------------------------------------------+EVENT TIME: 23:55[EST]| |NRC NOTIFIED BY: RODGER WEST |LAST UPDATE DATE: 11/22/95 | |HQ OPS OFFICER: RUDY KARSCH +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |BRENT CLAYTON RDO | |ADAS 50.72(b)(2)(i) DEG/UNANALYZED COND | | | | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | 1 | N N 0 REFUELING | 65 POWER OPERATION | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | THE "WEST" CENTRIFUGAL CHARGING PUMP (CCP) MIGHT HAVE TRIPPED PREMATURELY | | DURING AN EVENT DUE TO AN IMPROPERLY SET OVERLOAD RELAY. | | | | ON 9/12/95, THE "WEST" CCP TRIPPED DURING TESTING AFTER 7 MINUTES OF | | OPERATION. THIS WAS CAUSED BY AN OVERLOAD PROTECTION RELAY THAT WAS | | INADVERTENTLY SET TOO LOW. THEREFORE, THE "WEST" CCP MAY NOT HAVE BEEN | | CAPABLE OF SUCCESSFULLY PERFORMING IT SAFETY FUNCTION DURING A DESIGN BASIS | | ACCIDENT. | | | | UNIT 1 WAS OPERATING OUTSIDE ITS DESIGN BASIS FOR AN EXTENDED PERIOD OF | | TIME AND WAS IN A CONDITION PROHIBITED BY TECH SPECS. THIS CONDITION WAS | | DISCOVERED AND CORRECTED WHILE THE UNIT WAS SHUT DOWN, BUT IT MAY HAVE | | EXISTED DURING UNIT OPERATION. THE LICENSEE INFORMED THE NRC RESIDENT | | INSPECTOR. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 29636 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: DIABLO CANYON REGION: 4 |NOTIFICATION DATE: 11/22/95 | |UNIT: [ ] [2] [ ] STATE: CA |NOTIFICATION TIME: 19:56 [ET]| |RX TYPE: [1] W-4-LP,[2] W-4-LP |EVENT DATE: 11/22/95 | +------------------------------------------------+EVENT TIME: 16:30[PST]| |NRC NOTIFIED BY: BOB MAGRUDER |LAST UPDATE DATE: 11/22/95 | |HQ OPS OFFICER: RUDY KARSCH +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |IAN BARNES RDO | |AINB 50.72(b)(2)(iii)(B) POT RHR INOP | | |AIND 50.72(b)(2)(iii)(D) ACCIDENT MITIGATION | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | | | | | 2 | N Y 100 POWER OPERATION | 100 POWER OPERATION | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | TRAIN "A" ESF COMPONENTS WERE NOT OPERABLE FOR COLD LEG RECIRCULATION FOR | | 11 HOURS DUE TO AN IMPROPER TAGOUT. | | | | THE LICENSEE CONDUCTED A REVIEW OF ITS RECORDS DUE TO AN EVENT REPORTED BY | | SEQUOYAH NUCLEAR PLANT. PG&E FOUND THAT FOR 11 HOURS ON 11/20-21/89, | | SAFETY INJECTION PUMP (SIP) "2-1" AND RESIDUAL HEAT REMOVAL (RHR) PUMP | | "2-2", BOTH TRAIN "A" ESF COMPONENTS, WERE INOPERABLE DUE TO PLANNED | | MAINTENANCE. THIS PLANT CONFIGURATION MADE TRANSFER TO COLD LEG | | RECIRCULATION FROM THE REMAINING SIP 2-2 IMPOSSIBLE WITHOUT OPERATOR ACTION | | OUTSIDE EMERGENCY OPERATING PROCEDURE (EOP) E-1.3, TRANSFER TO COLD LEG | | RECIRCULATION, PROCEDURAL STEPS. THE EOP SEPARATES THE RHR TRAINS BY | | CLOSING RHR CROSS-TIE VALVES "8716A" AND "8716B" WHICH WOULD HAVE PREVENTED | | RHR "2-1" FROM SUPPLYING SIP "2-2" SUCTION. SUCH A VALVE MISALIGNMENT IS | | REPORTABLE IN THAT THE REDUNDANT TRAINS COULD HAVE FAILED TO PERFORM THEIR | | INTENDED FUNCTION BECAUSE OF A PROCEDURAL DEFICIENCY. THIS IS REPORTABLE | | EVEN THOUGH THE ALTERNATE FLOW PATH OF THE CROSS-TIE VALVES COULD HAVE BEEN | | OPENED TO FULFILL THE SAFETY FUNCTION. | | | | THE LICENSEE HAS TAKEN CORRECTIVE ACTION TO REVISE THE PROCEDURES TO | | PROHIBIT MAKING SIPs AND RHR PUMPS UNAVAILABLE AT THE SAME TIME. THE | | LICENSEE WILL INFORM THE NRC RESIDENT INSPECTOR. | +------------------------------------------------------------------------------+