U.S. Nuclear Regulatory Commission Operations Center Event Reports For 04/05/95 - 04/06/95 ** EVENT NUMBERS ** 28508 28544 28638 !!!!!!!!! THIS EVENT HAS BEEN RETRACTED. THIS EVENT HAS BEEN RETRACTED !!!!!!! +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 28508 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: MAINE YANKEE REGION: 1 |NOTIFICATION DATE: 03/09/95 | |UNIT: [1] [ ] [ ] STATE: ME |NOTIFICATION TIME: 15:10 [ET]| |RX TYPE: [1] CE |EVENT DATE: 03/09/95 | +------------------------------------------------+EVENT TIME: 11:30[EST]| |NRC NOTIFIED BY: McDOUGOLD |LAST UPDATE DATE: 04/05/95 | |HQ OPS OFFICER: TIM McGINTY +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |JAMES JOYNER 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 | 0 REFUELING | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | EXCESSIVE LEAKAGE ON A CONTAINMENT PENETRATION COMPONENT COOLING CHECK | | VALVE. | | | | WHILE SHUTDOWN WITH THE REACTOR DEFUELED, ENGINEERING TESTED A CHECK VALVE | | THAT WAS "UNMEASURABLE" DUE TO THE EXCESSIVE LEAKAGE PREVENTING THE TEST | | PRESSURE FROM BEING OBTAINED. THIS CAUSED THE COMBINED TYPE B AND C LEAK | | RATE TO EXCEED THE TECHNICAL SPECIFICATION LIMIT OF 0.6 La. | | | | THIS INSIDE BARRIER CHECK VALVE, PCC-280, IS USED FOR COMPONENT COOLING OF | | THE CONTAINMENT PENETRATION. THE OUTSIDE BARRIERS, INCLUDING A MOTOR | | OPERATED VALVE, HAD A LEAK RATE OF 2.04 lbs-mass air/day AT 55 psig. BASED | | ON SINGLE FAILURE CRITERIA, CREDIT FOR THE OUTSIDE BARRIER CAN NOT BE TAKEN | | IN MAINTAINING CONTAINMENT INTEGRITY. THIS FAILED SURVEILLANCE IS BEING | | TRACKED BY ENGINEERING AND THE VALVE WILL BE REPAIRED PRIOR TO EXCEEDING | | 210 øF. | | | | THE LICENSEE WILL INFORM THE RESIDENT INSPECTOR. | | | | * * * UPDATE AT 1600 ON 4/5/95 BY WALDMAN TAKEN BY WEAVER * * * | | THE LICENSEE IS RETRACTING THIS EVENT BASED ON DISCUSSIONS WITH THE | | RESIDENT INSPECTOR AND NRC HQ. THE PLANT DEVELOPED THE FOLLOWING GUIDANCE. | | A FAILURE OF A SINGLE CONTAINMENT ISOLATION VALVE IN A PENETRATION DOES NOT | | CONSTITUTE A PRINCIPLE SAFETY BARRIER BEING SERIOUSLY DEGRADED AS LONG AS | | THE SECOND VALVE OR BARRIER IN THE SAME PENETRATION IS OPERABLE, AND THE | | ENTIRE PENETRATION HAS NOT FAILED. | +------------------------------------------------------------------------------+ !!!!!!!!! THIS EVENT HAS BEEN RETRACTED. THIS EVENT HAS BEEN RETRACTED !!!!!!! +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 28544 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: MAINE YANKEE REGION: 1 |NOTIFICATION DATE: 03/16/95 | |UNIT: [1] [ ] [ ] STATE: ME |NOTIFICATION TIME: 19:08 [ET]| |RX TYPE: [1] CE |EVENT DATE: 03/16/95 | +------------------------------------------------+EVENT TIME: 16:25[EST]| |NRC NOTIFIED BY: DAN MCDOUGOLD |LAST UPDATE DATE: 04/05/95 | |HQ OPS OFFICER: JOSEPH SEBROSKY +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |MICHAEL MODES 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 | 0 REFUELING | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | A CONTAINMENT SUMP PUMP DISCHARGE VALVE FAILED A LOCAL LEAK RATE TEST. | | | | THE FOLLOWING IS A TEXT OF A FACSIMILE FROM THE LICENSEE: | | | | "WHILE SHUTDOWN WITH THE REACTOR DEFUELED, ENGINEERING TESTED AN AIR | | OPERATED VALVE THAT WAS 'UNMEASURABLE' DUE TO EXCESSIVE LEAKAGE PREVENTING | | THE TEST PRESSURE FROM BEING OBTAINED. THIS CAUSED THE COMBINED TYPE B AND | | C LEAK RATE TO EXCEED THE TECHNICAL SPECIFICATION LIMIT OF 0.6 La. THIS | | INSIDE BARRIER AIR OPERATED VALVE, PD-A-122, IS USED FOR ISOLATING THE | | CONTAINMENT SUMP PUMP DISCHARGE, WHICH PENETRATES THE CONTAINMENT. BASED | | ON SINGLE FAILURE CRITERIA, THE OUTSIDE BARRIER CAN NOT BE TAKEN CREDIT IN | | MAINTAINING CONTAINMENT INTEGRITY. THIS FAILED SURVEILLANCE IS BEING | | TRACKED BY ENGINEERING AND THE VALVE WILL BE REPAIRED PRIOR TO EXCEEDING | | 210 DEGREES F." | | | | THE VALVE WAS TESTED DURING THE LAST REFUELING OUTAGE. DURING THAT OUTAGE | | THE VALVE ALSO FAILED THE LEAK RATE TEST AND HAD TO BE REPAIRED. | | | | THE LICENSEE WILL INFORM THE RESIDENT INSPECTOR. | | | | * * * UPDATE AT 1600 ON 4/5/95 BY WALDMAN TAKEN BY WEAVER * * * | | THE LICENSEE IS RETRACTING THIS EVENT BASED ON DISCUSSIONS WITH THE | | RESIDENT INSPECTOR AND NRC HQ. THE PLANT HAS DEVELOPED THE FOLLOWING | | CLARIFICATION. A FAILURE OF A SINGLE CONTAINMENT ISOLATION VALVE IN A | | PENETRATION DOES NOT CONSTITUTE A PRINCIPLE SAFETY BARRIER BEING SERIOUSLY | | DEGRADED AS LONG AS THE SECOND VALVE OR BARRIER IN THE SAME PENETRATION IS | | OPERABLE, AND THE ENTIRE PENETRATION HAS NOT FAILED. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 28638 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: WASHINGTON NUCLEAR REGION: 4 |NOTIFICATION DATE: 04/05/95 | |UNIT: [2] [ ] [ ] STATE: WA |NOTIFICATION TIME: 13:24 [ET]| |RX TYPE: [2] GE-5 |EVENT DATE: 04/05/95 | +------------------------------------------------+EVENT TIME: 09:57[PST]| |NRC NOTIFIED BY: PERINO |LAST UPDATE DATE: 04/05/95 | |HQ OPS OFFICER: DOUG WEAVER +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |JOHN PELLET RDO | |ARPS 50.72(b)(2)(ii) RPS ACTUATION | | | | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | 2 | A/R Y 100 POWER OPERATION | 0 HOT SHUTDOWN | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | REACTOR SCRAM ON TURBINE TRIP | | | | AN RPS ACTUATION OCCURRED AT 0957 ON 4/5/95. THE APPARENT CAUSE OF THE RPS | | ACTUATION WAS A TURBINE TRIP. ALL CONTROL RODS INSERTED. FOUR SRVs OPENED | | AT THEIR RELIEF SETPOINTS. NO OTHER ENGINEERED SAFETY FEATURES ACTUATED | | DURING THE EVENT. | | | | THE PLANT IS STABLE IN HOT SHUTDOWN. REACTOR PRESSURE IS BEING CONTROLLED | | BY THE EHC SYSTEM. REACTOR WATER LEVEL IS BEING MAINTAINED BY THE | | FEEDWATER SYSTEM. THE CAUSE OF THE TURBINE TRIP IS UNDER INVESTIGATION. | | | | THE LICENSEE INFORMED THE NRC RESIDENT INSPECTOR. A PRESS RELEASE IS | | PLANNED. | +------------------------------------------------------------------------------+