U.S. Nuclear Regulatory Commission Operations Center Event Reports For 09/20/94 - 09/21/94 ** EVENT NUMBERS ** 27789 27801 27802 27803 !!!!!!!!! THIS EVENT HAS BEEN RETRACTED. THIS EVENT HAS BEEN RETRACTED !!!!!!! +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 27789 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: NORTH ANNA REGION: 2 |NOTIFICATION DATE: 09/16/94 | |UNIT: [1] [ ] [ ] STATE: VA |NOTIFICATION TIME: 02:05 [ET]| |RX TYPE: [1] W-3-LP,[2] W-3-LP |EVENT DATE: 09/15/94 | +------------------------------------------------+EVENT TIME: 22:45[EDT]| |NRC NOTIFIED BY: FRANK GLENN |LAST UPDATE DATE: 09/20/94 | |HQ OPS OFFICER: RUDY KARSCH +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |LAWRENCE LAWYER RDO | |AINC 50.72(b)(2)(iii)(C) POT UNCNTRL RAD REL | | |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 +------------------------------------------------------------------------------+ | PERSONNEL AIR LOCK OPENED DURING CORE ALTERATIONS. | | | | DURING CONTROL ROD UNLATCH VERIFICATION TESTING THE LICENSEE DETERMINED | | THAT THE CONTAINMENT OUTER DOOR ESCAPE HATCH FOR THE PERSONNEL AIR LOCK | | HAD BEEN OPENED WITH THE INNER DOOR OPEN. THE TESTING WAS STOPPED IN | | ACCORDANCE WITH TECH SPECS FOR CONTAINMENT INTEGRITY DURING CORE | | ALTERATIONS, AND THE INCIDENT WAS INVESTIGATED. | | | | PROPER ADMINISTRATIVE CONTROLS (A BLUE TAG AND LARGE RED PLAQUE) WERE IN | | PLACE TO PREVENT DOOR OPERATION, BUT WERE VIOLATED BY A CONTRACT HEAVY | | EQUIPMENT OPERATOR. | | | | THE LICENSEE WILL INFORM THE NRC RESIDENT INSPECTOR. | | | | *** RETRACTION FROM ROBERTS TO HUFFMAN AT 12:42 EDT ON 9/20/56 *** | | THE FOLLOWING IS THE TEXT OF A FACSIMILE FROM THE LICENSEE JUSTIFYING THE | | RETRACTION: | | "ON SEPTEMBER 16, 1994, AT 0205 HOURS, A FOUR HOUR REPORT WAS MADE PURSUANT | | TO THE REQUIREMENTS OF 10CFR50.72(b)(2)(iii) BECAUSE THE UNIT 1 CONTAINMENT | | PERSONNEL HATCH ESCAPE DOOR WAS INADVERTENTLY OPENED DURING CONTROL ROD | | UNLATCH VERIFICATION. | | | | A SUBSEQUENT INVESTIGATION DETERMINED THAT A PLAUSIBLE FUEL HANDLING | | ACCIDENT INITIATOR WAS NOT PRESENT DURING THE SHORT PERIOD (SECONDS) THAT | | THE ESCAPE HATCH WAS OPENED. NO FUEL WAS BEING LIFTED AND THE UPPER | | INTERNALS WERE PROTECTING THE FUEL. THEREFORE, THE POSSIBILITY OF A DESIGN | | BASIS FUEL HANDLING ACCIDENT DID NOT EXIST. IN ADDITION, AN OPERATOR | | ASSIGNED TO OPERATE THE HATCH DURING CORE ALTERATIONS AND ENSURE INTEGRITY | | WAS MAINTAINED RECOGNIZED THE BREACH AND IMMEDIATELY RESTORED CONTAINMENT | | INTEGRITY AND INFORMED THE CONTROL ROOM TO STOP CONTROL ROD UNLATCH | | VERIFICATION AS REQUIRED BY TECHNICAL SPECIFICATIONS. | | | | SINCE CONTAINMENT INTEGRITY WAS IMMEDIATELY RESTORED AND TECHNICAL | | SPECIFICATIONS REQUIREMENTS TO STOP CORE ALTERATIONS WERE SATISFIED, THE | | FOUR HOUR REPORT IS BEING RETRACTED. DUE TO THE CHANGE IN REPORTABILITY, A | | LER WILL NOT BE SUBMITTED." | | | | THE RESIDENT INSPECTOR AND R2DO(DECKER) HAVE BEEN NOTIFIED. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 27801 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: SOUTH TEXAS REGION: 4 |NOTIFICATION DATE: 09/20/94 | |UNIT: [1] [ ] [ ] STATE: TX |NOTIFICATION TIME: 05:10 [ET]| |RX TYPE: [1] W-4-LP,[2] W-4-LP |EVENT DATE: 09/20/94 | +------------------------------------------------+EVENT TIME: 01:05[CDT]| |NRC NOTIFIED BY: KRUGER |LAST UPDATE DATE: 09/20/94 | |HQ OPS OFFICER: CHAUNCEY GOULD +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |TOM STETKA 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 +------------------------------------------------------------------------------+ | THE PLANT RECEIVED AN AUTOMATIC REACTOR/TURBINE TRIP ON A LO-LO LEVEL | | SIGNAL ON THE "1C" S/G. | | | | IMMEDIATELY PRIOR TO THE TRIP, EFFORTS WERE IN PROGRESS TO REDUCE REACTOR | | POWER AND TURBINE LOAD FOLLOWING THE UNANTICIPATED TRIP OF THE #13 TURBINE | | DRIVEN MAIN FEEDWATER PUMP (THE CAUSE OF THIS PUMP TRIP IS BEING | | INVESTIGATED). AN AUX FEEDWATER ACTUATION(ESF) WAS RECEIVED, AS EXPECTED, | | DUE TO THE LO-LO S/G LEVEL SIGNAL. ALL COMPONENTS ACTUATED TO THEIR | | REQUIRED ESF POSITIONS. FOLLOWING THE REACTOR TRIP, ALL SYSTEMS RESPONDED | | AS DESIGNED WITH THE FOLLOWING EXCEPTIONS: | | | | 1) CONTROL BANK "D" ROD "M4" ROD BOTTOM LIGHT DID NOT FULLY ILLUMINATE. (AN | | INVESTIGATION IS BEING MADE TO DETERMINE THE CAUSE) | | | | 2) STARTUP S/G FEEDWATER PUMP RECIRC VALVE DID NOT CLOSE AFTER THE PUMP | | RECEIVED AN AUTO START SIGNAL FOLLOWING THE TRIP OF THE #13 TURBINE DRIVEN | | MAIN FEEDWATER PUMP. (THE CAUSE OF THIS FAILURE IS ALSO BEING INVESTIGATED) | | | | TROUBLESHOOTING IS IN PROGRESS ON THE DIGITAL ROD POSITION INDICATION | | SYSTEM TO DETERMINE THE CAUSE OF THE ROD BOTTOM LIGHT FAILURE. IT APPEARS | | THAT ALL RODS DID FULLY INSERT, HOWEVER, THEY DO USE THE ROD BOTTOM LIGHTS | | TO VERIFY ACCURATE ROD POSITION ON THE BOTTOM. THERE WAS NO SI AND NO | | SAFETY RELIEF VALVES OPENED. THE CURRENT HEAT SINK IS THE MAIN CONDENSER. | | ANOTHER PROBLEM SUBSEQUENT TO THE TRIP WAS THAT A STAINLESS STEEL FLEX TUBE | | BROKE ON THE "C" FEEDWATER ISOLATION BYPASS FLOW SWITCH. | | | | THE RI WAS INFORMED. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 27802 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: BRAIDWOOD REGION: 3 |NOTIFICATION DATE: 09/20/94 | |UNIT: [1] [2] [ ] STATE: IL |NOTIFICATION TIME: 06:13 [ET]| |RX TYPE: [1] W-4-LP,[2] W-4-LP |EVENT DATE: 09/20/94 | +------------------------------------------------+EVENT TIME: 02:05[CDT]| |NRC NOTIFIED BY: BEST |LAST UPDATE DATE: 09/20/94 | |HQ OPS OFFICER: CHAUNCEY GOULD +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |ROY CANIANO 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 | | 2 | N Y 100 POWER OPERATION | 100 POWER OPERATION | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | THE PLANT HAD THE RUNNING MAIN CONTROL ROOM VENTILATION TRAIN TO | | AUTOMATICALLY SHIFT TO THE MAKEUP MODE DUE TO A HIGH RADIATION SIGNAL. | | | | THIS SIGNAL WAS RECEIVED WHEN THE INTAKE RAD MONITOR "OPA233" REACHED ITS | | ALARM SETPOINT. SUBSEQUENTLY SEVERAL OTHER RAD MONITORS REACHED THEIR ALARM | | SETPOINTS. AS A RESULT OF THIS, SEVERAL AIR SAMPLES WERE TAKEN THROUGH OUT | | THE PLANT AND THE READINGS APPEARED TO BE NORMAL. IT APPEARS THAT THE CAUSE | | OF THE RAD MONITORS REACHING THEIR ALARM SETPOINTS WAS DUE TO AN | | ATMOSPHERIC TEMPERATURE INVERSION WHICH OCCURRED PRIOR TO THE ALARMS. ALL | | RADIATION MONITOR LEVELS RETURNED TO NORMAL WITHIN 45 MINS. THE RI WILL BE | | INFORMED. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 27803 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: RIVER BEND REGION: 4 |NOTIFICATION DATE: 09/20/94 | |UNIT: [1] [ ] [ ] STATE: LA |NOTIFICATION TIME: 11:02 [ET]| |RX TYPE: [1] GE-6 |EVENT DATE: 09/20/94 | +------------------------------------------------+EVENT TIME: 09:15[CDT]| |NRC NOTIFIED BY: TURNER |LAST UPDATE DATE: 09/20/94 | |HQ OPS OFFICER: CHAUNCEY GOULD +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |TOM STETKA RDO | |DDDD 73.71 UNSPECIFIED PARAGRAPH | | | | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | 1 | N N 0 REFUELING | 0 REFUELING | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | DISCOVERY OF A CRIMINAL ACT INVOLVING AN INDIVIDUAL GRANTED ACCESS TO THE | | SITE. IMMEDIATE COMPENSATORY MEASURES TAKEN. SEE HOO LOG FOR DETAILS. THE | | RI WAS INFORMED. | +------------------------------------------------------------------------------+