U.S. Nuclear Regulatory Commission Operations Center Event Reports For 01/29/96 - 01/30/96 ** EVENT NUMBERS ** 29897 29900 29901 29902 29903 +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 29897 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: SEABROOK REGION: 1 |NOTIFICATION DATE: 01/27/96 | |UNIT: [1] [ ] [ ] STATE: NH |NOTIFICATION TIME: 11:05 [ET]| |RX TYPE: [1] W-4-LP |EVENT DATE: 01/27/96 | +------------------------------------------------+EVENT TIME: 09:45[EST]| |NRC NOTIFIED BY: MORRISSEY |LAST UPDATE DATE: 01/29/96 | |HQ OPS OFFICER: JOHN MacKINNON +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |RICK KEIMIG RDO | |ARPS 50.72(b)(2)(ii) RPS ACTUATION | | |AESF 50.72(b)(2)(ii) ESF ACTUATION | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | 1 | A/R Y 100 POWER OPERATION | 0 HOT STANDBY | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | REACTOR TRIP ON HIGH PRESSURIZER PRESSURE. ALL RODS FULLY INSERTED. | | | | LICENSEE RECEIVED AN AUTOMATIC REACTOR TRIP ON HIGH PRESSURIZER PRESSURE | | (SETPOINT 2385psig). BOTH PRESSURIZER PORVs OPENED AND THEN CLOSED. NO | | PRESSURIZER CODE SAFETY VALVES OPENED. ALL RODS FULLY INSERTED INTO THE | | CORE. LICENSEE RECEIVED AN EXPECTED FEEDWATER ISOLATION SIGNAL ON LOW Tave | | COINCIDENT WITH A REACTOR TRIP. THEIR MOTOR DRIVEN AND TURBINE DRIVEN | | AUXILIARY FEEDWATER PUMPS AUTOMATICALLY STARTED ON LOW LOW STEAM GENERATOR | | WATER LEVEL. THE AUXILIARY FEEDWATER PUMPS HAVE BEEN SECURED AND STEAM | | GENERATOR WATER LEVEL IS BEING MAINTAINED VIA THEIR STARTUP FEEDWATER PUMP. | | STEAM DUMP BYPASS CONTROL SYSTEM OPERATED PROPERLY AND IS MAINTAINING THE | | REACTOR COOLANT SYSTEM AT A Tave NO LOAD CONDITION OF 557ø F. | | ALL THREE LOW PRESSURE TURBINE INLET COMBINED INTERMEDIATE VALVES (2 VALVES | | PER TURBINE) CLOSED BEFORE THE REACTOR TRIPPED ON HIGH PRESSURIZER | | PRESSURE. EHC SYSTEM PUMPS ARE OPERATING PROPERLY. LICENSEE THINKS THAT | | MAYBE THE EHC DUMP VALVE OPENED & CLOSE WHICH CAUSED THE LOW PRESSURE MAIN | | TURBINE INLET COMBINED INTERMEDIATE VALVES TO CLOSE. | | NO STEAM GENERATOR ATMOSPHERIC OR CODE SAFETY VALVES OPENED. ALL EDGs AND | | THE EMERGENCY CORE COOLING SYSTEM ARE FULLY OPERABLE IF NEEDED. LICENSEE IS | | INVESTIGATING WHAT CAUSED THE REACTOR TRIP. | | | | RESIDENT INSPECTOR WAS INFORMED BY THE LICENSEE. | | | | ****UPDATE @0411ET 01/28/96 BY DEECK TAKEN BY MACKINNON**** | | | | IT APPEARS THAT A FAILED CARD IN THE EHC CABINET CAUSED THE LOW PRESSURE | | TURBINE COMBINED INTERMEDIATE VALVES TO CLOSE. RI NOTIFIED. R1DO (RICK | | KEIMIG) NOTIFIED. | | | | ***UPDATE @1012ET 01/29/96 BY KILBY TAKEN BY MACKINNON*** | | | | ONE CIRCUIT CARD FOR THE SPEED CONTROL CIRCUIT LOCATED IN THE EHC CABINET | | FAILED. THIS CAUSED A LARGE SPEED ERROR SIGNAL WHICH CAUSED THE MAIN | | TURBINE CONTROL VALVES AND THE LOW PRESSURE TURBINE COMBINED INTERMEDIATE | | VALVES TO CLOSE. BOTH SPEED CONTROL CIRCUIT CARDS LOCATED IN THE EHC | | CABINET WERE REPLACED. RI WILL BE NOTIFIED. R1DO (RICK KEIMIG) NOTIFIED. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 29900 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: MONTICELLO REGION: 3 |NOTIFICATION DATE: 01/29/96 | |UNIT: [1] [ ] [ ] STATE: MN |NOTIFICATION TIME: 17:07 [ET]| |RX TYPE: [1] GE-3 |EVENT DATE: 01/29/96 | +------------------------------------------------+EVENT TIME: 15:10[CST]| |NRC NOTIFIED BY: JIM RHODES |LAST UPDATE DATE: 01/29/96 | |HQ OPS OFFICER: RUDY KARSCH +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |RONALD GARDNER RDO | |DDDD 73.71 UNSPECIFIED PARAGRAPH | | | | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | 1 | N Y 98 POWER OPERATION | 98 POWER OPERATION | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | AN OPENING IN THE SERVICE WATER INTAKE STRUCTURE WAS LEFT UNATTENDED AND | | UNSECURED FOR ABOUT 5 HOURS. | | | | THE LICENSEE REMOVED A RESIDUAL HEAT REMOVAL SERVICE WATER PUMP FROM THE | | INTAKE STRUCTURE, BUT LEFT THE RESULTING HOLE UNSECURED. THE OPENING WAS | | COVERED BY A SHEET METAL COVER, BUT IT WAS NOT BOLTED IN PLACE. THE | | OPENING WAS LEFT UNATTENDED FROM 1158 CST TO 1510 CST. AFTER THE BREACH | | IN SECURITY WAS DISCOVERED, THE AREA WAS CHECKED AND NO EVIDENCE OF ENTRY | | OR CONTRABAND WAS FOUND. THE COVER HAS BEEN BOLTED OVER THE OPENING. THE | | LICENSEE WILL INFORM THE NRC RESIDENT INSPECTOR. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 29901 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: MILLSTONE REGION: 1 |NOTIFICATION DATE: 01/29/96 | |UNIT: [1] [ ] [ ] STATE: CT |NOTIFICATION TIME: 17:39 [ET]| |RX TYPE: [1] GE-3,[2] CE,[3] W-4-LP |EVENT DATE: 01/29/96 | +------------------------------------------------+EVENT TIME: 17:22[EST]| |NRC NOTIFIED BY: DWAYNE BASLER |LAST UPDATE DATE: 01/29/96 | |HQ OPS OFFICER: RUDY KARSCH +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |RICHARD CONTE 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 +------------------------------------------------------------------------------+ | BOTH EMERGENCY POWER SUPPLIES WERE INOPERABLE SIMULTANEOUSLY. | | | | EMERGENCY POWER IS PROVIDED BY AN EMERGENCY DIESEL GENERATOR (EDG) AND AN | | EMERGENCY GAS TURBINE GENERATOR (GTG). A REVIEW BY THE LICENSEE REVEALED | | THAT THE EDG AND GTG WERE BOTH INOPERABLE AT THE SAME TIME. THE GTG HAS | | FUEL IN TWO SEPARATE UNDERGROUND STORAGE TANKS. THE FUEL FORWARDING PUMP | | FOR ONE OF THE TANKS WAS INOPERABLE. THE FUEL INVENTORY IN THE REMAINING | | TANK IS INSUFFICIENT TO SATISFY TECH SPEC REQUIREMENTS. WHEN THE EDG IS | | UNDERGOING TECH SPEC SURVEILLANCE TESTING IT IS CONSIDERED INOPERABLE BY | | THE LICENSEE. THE EDG MAY ALSO HAVE BEEN OUT OF SERVICE FOR SCHEDULED | | MAINTENANCE. THE LICENSEE IS STILL INVESTIGATING THEIR RECORDS. THE | | LICENSEE WILL RETURN THE FUEL FORWARDING PUMP TO OPERABLE STATUS PRIOR TO | | CORE RELOAD. | | | | THE LICENSEE WILL INFORM THE NRC RESIDENT INSPECTOR AND HAS INFORMED THE | | CONNECTICUT DEPARTMENT OF ENVIRONMENTAL PROTECTION AND THE WATERFORD POLICE | | DEPARTMENT. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 29902 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: ZION REGION: 3 |NOTIFICATION DATE: 01/29/96 | |UNIT: [1] [2] [ ] STATE: IL |NOTIFICATION TIME: 19:10 [ET]| |RX TYPE: [1] W-4-LP,[2] W-4-LP |EVENT DATE: 01/29/96 | +------------------------------------------------+EVENT TIME: 17:54[CST]| |NRC NOTIFIED BY: CURT BASNER |LAST UPDATE DATE: 01/29/96 | |HQ OPS OFFICER: RUDY KARSCH +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |RON GARDNER RDO | |ADEG 50.72(b)(1)(ii) DEGRAD COND DURING OP | | | | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | 1 | N Y 100 POWER OPERATION | 100 POWER OPERATION | | 2 | N N 0 STARTUP | 0 STARTUP | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | AUX BUILDING FANS TRIPPED ON HIGH NEGATIVE PRESSURE RESULTING IN A LOSS OF | | REQUIRED NEGATIVE PRESSURE FOR HALF AN HOUR. | | | | ON 1/17/96, AUX BUILDING SUPPLY AND EXHAUST FAN HIGH DIFFERENTIAL PRESSURE | | TRIP WAS REINSTATED. THE PURPOSE OF THIS TRIP IS TO AVOID A PRESSURE | | DIFFERENCE BETWEEN THE AUX BUILDING AND THE OUTSIDE WHICH WOULD MAKE IT | | IMPOSSIBLE FOR WORKERS IN THE AUX BUILDING TO OPEN DOORS TO THE OUTSIDE. | | | | TODAY MANY INDICATIONS OF HIGH AUX BUILDING DIFFERENTIAL PRESSURE WERE | | RECEIVED. THE TECH SPEC REQUIRED DESIGN BASIS NEGATIVE PRESSURE | | DIFFERENTIAL OF 0.25 INCH OF WATER TO THE OUTSIDE COULD NOT BE MAINTAINED | | WHEN THE FANS TRIPPED. THE DURATION OF THE LONGEST LOSS WAS HALF AN HOUR. | | | | THE LICENSEE IS INVESTIGATING THE CAUSE OF THE HIGH DIFFERENTIAL PRESSURE | | TRIP. AN ACTUAL HIGH PRESSURE DOES NOT SEEM TO HAVE BEEN PRESENT. THE | | FANS ARE OPERATING IN MANUAL PRESSURE CONTROL MODE AT THIS TIME. THE | | LICENSEE WILL INFORM THE NRC RESIDENT INSPECTOR. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 29903 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: RIVER BEND REGION: 4 |NOTIFICATION DATE: 01/30/96 | |UNIT: [1] [ ] [ ] STATE: LA |NOTIFICATION TIME: 03:54 [ET]| |RX TYPE: [1] GE-6 |EVENT DATE: 01/30/96 | +------------------------------------------------+EVENT TIME: 00:24[CST]| |NRC NOTIFIED BY: CARLSON |LAST UPDATE DATE: 01/30/96 | |HQ OPS OFFICER: JOHN MacKINNON +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |GENE BATES RDO | |ARPS 50.72(b)(2)(ii) RPS ACTUATION | | | | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | 1 | A N 0 REFUELING | 0 REFUELING | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | RECEIVED FULL SCRAM SIGNAL WHICH ACTUATED THEIR ALTERNATE ROD INSERTION | | (ARI). NO ROD MOVEMENT BECAUSE THE RODS WERE ALREADY FULLY INSERTED. | | | | WHILE HANGING CLEARANCE RB-96-0012 FOR BYS-INV01B TO ALLOW MAINTENANCE ON | | THE INVERTER, POWER WAS LOST TO 120 VOLT INSTRUMENT BUS VBN-PNL01B1. THIS | | CAUSED THE LOSS OF SEVERAL CONTROL ROOM INDICATIONS AND ALARMS PLUS THE | | INITIATION OF THE ALTERNATE ROD INSERTION (ARI) SYSTEM. WHEN ARI INITIATED, | | IT CAUSED WATER TO FLOW INTO THE SCRAM DISCHARGE VOLUME (SDV) AND AS THE | | SDV FILLED IT TRIPPED THE LEVEL TRANSMITTER ON THE SDV GIVING A DIVISION I | | REACTOR PROTECTION SYSTEM (RPS) SIGNAL. DIVISION II RPS WAS ALREADY TRIPPED | | DUE TO ONGOING MAINTENANCE. THIS COMBINATION RESULTED IN A FULL RPS | | ACTUATION. THERE WAS NO ROD MOVEMENT BECAUSE ALL RODS WERE FULLY INSERTED | | ALREADY. THE CLEARANCE WAS STOPPED AND THEN THEY BACKED OUT OF THE | | PROCEDURE. POWER WAS RESTORED TO THE INVERTED 14 MINUTES AFTER POWER HAD | | BEEN LOST TO THE INVERTER. SCRAM SIGNAL WAS RESET. SHUTDOWN COOLING | | REMAINED IN SERVICE DURING THIS EVENT. | | THE PROCEDURE FOR WORKING ON THE INVERTER HAD BEEN REVIEWED BY A SENIOR | | REACTOR OPERATOR PRIOR TO WORK ON THE INVERTER HAD BEEN AUTHORIZED. THE | | SENIOR REACTOR OPERATOR MISSED SUPPLYING ALTERNATE POWER TO THE INSTRUMENT | | BUS WHEN THE INVERTER WAS TAKEN OUT OF SERVICE. | | | | RESIDENT INSPECTOR WILL BE INFORMED BY THE LICENSEE. | +------------------------------------------------------------------------------+