U.S. Nuclear Regulatory Commission Operations Center Event Reports For 05/11/94 - 05/12/94 ** EVENT NUMBERS ** 27229 27233 27234 27235 +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 27229 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: DIABLO CANYON REGION: 4 |NOTIFICATION DATE: 05/10/94 | |UNIT: [1] [ ] [ ] STATE: CA |NOTIFICATION TIME: 15:06 [ET]| |RX TYPE: [1] W-4-LP,[2] W-4-LP |EVENT DATE: 05/10/94 | +------------------------------------------------+EVENT TIME: 11:45[PDT]| |NRC NOTIFIED BY: BOB MAGRUDER |LAST UPDATE DATE: 05/11/94 | |HQ OPS OFFICER: RUDY KARSCH +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: UNUSUAL EVENT +-----------------------------+ |10 CFR SECTION: |WILLIAM JOHNSON RDO | |AAEC 50.72(a)(1)(i) EMERGENCY DECLARED |AL CHAFFEE EO | |ASHU 50.72(b)(1)(i)(A) PLANT S/D REQD BY TS |STINEDRUF FEMA | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | 1 | N Y 2 STARTUP | 2 STARTUP | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | UNUSUAL EVENT DECLARED DUE TO FORCED UNIT SHUTDOWN. | | | | THE LICENSEE DECLARED AN UNUSUAL EVENT WHEN THEY DETERMINED THAT THE "C" | | PHASE OF THEIR MAIN TRANSFORMER HAD TO BE REPLACED, AND THE TIME WOULD | | EXCEED THE 72 HOURS ALLOWED BY TECH SPECS. THE OUTAGE IS EXPECTED TO LAST | | 10 DAYS. THE UNUSUAL EVENT WILL TERMINATE WHEN THE UNIT REACHES MODE 5, | | COLD SHUTDOWN. THE LICENSEE INFORMED STATE AND LOCAL AUTHORITIES AND THE | | NRC RESIDENT INSPECTOR. A PRESS RELEASE WAS ISSUED. | | | | * UPDATE DATE/TIME:5/11/94 @ 0155 EDT *FROM LICENSEE:ANDERSEN BY:McGINTY* | | THE UNUSUAL EVENT WAS TERMINATED AT 2245 PDT UPON REACHING COLD SHUTDOWN. | | THE LICENSEE INFORMED THE RESIDENT INSPECTOR. HOO NOTIFIED R4DO (JOHNSON), | | EO (CHAFFEE) AND FEMA (LOUZONIS). | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |GENERAL INFORMATION or OTHER | |EVENT NUMBER: 27233 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |LICENSEE: CHARTER POWER SYSTEMS |NOTIFICATION DATE: 05/11/94 | | CITY: PLYMOUTH MEETIN REGION: 1 |NOTIFICATION TIME: 10:47 [ET]| | COUNTY: STATE: PA |EVENT DATE: 05/09/94 | |LICENSE#: AGREEMENT: N |EVENT TIME: 12:00[EDT]| | DOCKET: |LAST UPDATE DATE: 05/11/94 | | +-----------------------------+ | |PERSON ORGANIZATION| | | | | | | +------------------------------------------------+ | |NRC NOTIFIED BY: HOLDEN | | |HQ OPS OFFICER: GREG SCARFO | | +------------------------------------------------+ | |EMERGENCY CLASS: NOT APPLICABLE | | |10 CFR SECTION: | | |CDEG 21.21(c)(3)(i) DEFECTS/NONCOMPLIANCE | | | | | | | | | | | | | | +------------------------------------------------+-----------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | DEFECTIVE POTTER AND BRUMFIELD RELAYS COULD AFFECT THE FUNCTIONALITY OF | | CLASS 1E SYSTEMS. | | | | AN APPARENT DEFECT IN THE LATCHING MECHANISM OF POTTER AND BRUMFIELD "R10- | | E3286-2" RELAYS (C&D PART NUMBER "JR-461-E") WHICH MAY AFFECT CLASS 1E | | SAFETY-RELATED CHARGERS IN THE FIELD. THE RELAY IS FOUND ON C&D HIGH | | VOLTAGE SHUTDOWN ALARM ASSEMBLY PRINTED CIRCUIT BOARDS (MBC-2920-E) USED IN | | C&D ARR CHARGERS. | | | | FAILURE OF THE RELAY WILL CAUSE AN APPARENT HIGH VOLTAGE SHUTDOWN OF THE | | CHARGER, TERMINATING CHARGING OF THE BATTERY SYSTEM UNTIL SUCH TIME AS THE | | RELAY IS RESET. FAILURE OF THE RELAY WILL ALSO CAUSE A HIGH VOLTAGE ALARM | | CONDITION IN THE CHARGER WHICH WILL NOTIFY SOMEONE TO RESET THE CHARGER. | | THE BATTERY ITSELF WILL BE UNAFFECTED UNLESS THE ALARM CONDITION IS NOT | | CORRECTED FOR A SUFFICIENT PERIOD OF TIME FOR THE BATTERIES TO BECOME | | DISCHARGED. FOR THIS REASON, IT IS BELIEVED THAT THE FAILURE MODE POSES NO | | IMMINENT DANGER. HOWEVER, THERE IS A SUBSTANTIAL SAFETY HAZARD DURING A | | SEISMIC EVENT AS A RESULT OF THIS DEFECT. | | | | INVESTIGATION CONTINUES INTO THE NATURE OF THE DEFECT AND CONTAINMENT OF | | THE DEFECTIVE PARTS. ALL "JR-461-E" RELAYS AND "MBC-2920-E BOARDS IN C&D | | STOCK HAVE BEEN ISOLATED AND UNDERGOING TESTING. INVESTIGATION IS ONGOING | | WITH POTTER AND BRUMFIELD TO ISOLATE THE TIME PERIOD OF THE APPARENTLY | | DEFECTIVE PARTS. PRINTED CIRCUIT BOARD "MBC-2920-E" IS BEING SEISMIC | | TESTED TO QUANTIFY THE EFFECT OF THE APPARENT DEFECT UNDER SEISMIC | | CONDITIONS. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 27234 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: QUAD CITIES REGION: 3 |NOTIFICATION DATE: 05/11/94 | |UNIT: [1] [2] [ ] STATE: IL |NOTIFICATION TIME: 22:52 [ET]| |RX TYPE: [1] GE-3,[2] GE-3 |EVENT DATE: 05/11/94 | +------------------------------------------------+EVENT TIME: 20:51[CDT]| |NRC NOTIFIED BY: JEFF DAVIS |LAST UPDATE DATE: 05/11/94 | |HQ OPS OFFICER: JOSEPH SEBROSKY +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |JOHN GROBE 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 | | 2 | N Y 97 POWER OPERATION | 97 POWER OPERATION | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | SAFEGUARDS SYSTEMS DEGRADATION RELATED TO DETECTION EXISTED FROM 20:51 TO | | 21:40. DURING THIS TIME COMPENSATORY ACTIONS WERE IN PLACE, HOWEVER, THE | | SECURITY ADMINISTRATOR HAS RAISED A QUESTION AS TO WHETHER OR NOT THE | | COMPENSATORY ACTIONS WERE OF AN EQUIVALENT LEVEL OF PROTECTION. SEE HOO | | LOG FOR FURTHER DETAILS. | | | | THE LICENSEE HAS INFORMED THE RESIDENT INSPECTOR. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 27235 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: SURRY REGION: 2 |NOTIFICATION DATE: 05/11/94 | |UNIT: [1] [ ] [ ] STATE: VA |NOTIFICATION TIME: 23:48 [ET]| |RX TYPE: [1] W-3-LP,[2] W-3-LP |EVENT DATE: 05/11/94 | +------------------------------------------------+EVENT TIME: 21:09[EDT]| |NRC NOTIFIED BY: GOODHOPE |LAST UPDATE DATE: 05/11/94 | |HQ OPS OFFICER: TIM McGINTY +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |DAVID MCGUIRE 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 | M/R Y 100 POWER OPERATION | 0 HOT STANDBY | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | REACTOR WAS MANUALLY TRIPPED FROM 100% WHEN THE INBOARD MOTOR BREAKER FOR | | THE "B" FEED PUMP TRIPPED DUE TO A RELAY WHICH WAS BUMPED DURING | | SURVEILLANCE TESTING. | | | | A RELAY WAS BUMPED DURING THE PERFORMANCE OF TRAIN "A" SAFEGUARDS ACTUATION | | LOGIC TESTING. THE RELAY CONTACTS MADE UP AND TRIPPED THE "B" MAIN | | FEEDWATER PUMP INBOARD MOTOR BREAKER "15C5". THE REACTOR WAS MANUALLY | | TRIPPED AT 2109 EDT, AS A PREEMPTIVE MEASURE IN ANTICIPATION OF A LOSS OF | | HEAT SINK TRIP. BOTH REACTOR TRIP BREAKERS OPENED AND ALL CONTROL RODS | | FULLY INSERTED ON THE TRIP. AUXILIARY FEEDWATER AUTOMATICALLY INITIATED, | | AS EXPECTED, ON LOW LOW STEAM GENERATOR LEVEL. THE MINIMUM PRESSURIZER | | LEVEL WAS 14%, AND THE MINIMUM PRESSURIZER PRESSURE WAS 1936 psig. BOTH | | PRESSURE AND LEVEL CONTROL REMAINED IN AUTOMATIC DURING THE TRANSIENT, AND | | BOTH PARAMETERS RETURNED TO NO-LOAD VALUES. NO PRIMARY OR SECONDARY RELIEF | | VALVES OPENED. | | | | THE PLANT RESPONSE TO THE TRANSIENT WAS NORMAL. THERE WERE NO PROBLEMS | | WITH TRANSFERS TO OFF-SITE POWER SUPPLIES. DECAY HEAT IS BEING REMOVED TO | | THE MAIN CONDENSER VIA THE STEAM DUMPS. THE "A" MAIN FEEDWATER PUMP WAS | | NEVER LOST, AND CURRENTLY THE STEAM GENERATORS ARE BEING FED VIA THE MAIN | | FEEDWATER REGULATING BYPASS VALVES. EACH MAIN FEEDPUMP HAS TO COUPLED 3000 | | hp MOTORS. WHEN THE INBOARD MOTOR BREAKER TRIPPED, A SIGNIFICANT AMOUNT OF | | FLOW WAS LOST, AND THEY WOULD HAVE TRIPPED ON LOSS OF HEAT SINK (LOW SG | | LEVEL WITH STEAM FLOW/FEED FLOW MIS-MATCH) HAD THEY NOT MANUALLY TRIPPED. | | THE CALLER STATED THAT EVENTUALLY, THE OUTBOARD MOTOR BREAKER FOR THE "B" | | FEED PUMP WOULD HAVE TRIPPED ON HIGH CURRENT ALSO. THE PLANT IS MAKING | | PREPARATIONS TO RESTART ON 5/12/94, AND HAS INFORMED THE RESIDENT | | INSPECTOR. | +------------------------------------------------------------------------------+