U.S. Nuclear Regulatory Commission Operations Center Event Reports For 05/05/95 - 05/08/95 ** EVENT NUMBERS ** 28765 28766 28767 28768 28769 28770 28771 28772 28773 +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 28765 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: QUAD CITIES REGION: 3 |NOTIFICATION DATE: 05/05/95 | |UNIT: [ ] [2] [ ] STATE: IL |NOTIFICATION TIME: 05:35 [ET]| |RX TYPE: [1] GE-3,[2] GE-3 |EVENT DATE: 05/05/95 | +------------------------------------------------+EVENT TIME: 03:24[CDT]| |NRC NOTIFIED BY: DAVIS |LAST UPDATE DATE: 05/05/95 | |HQ OPS OFFICER: CHAUNCEY GOULD +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |GEOFFREY WRIGHT RDO | |AESF 50.72(b)(2)(ii) ESF ACTUATION | | | | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | | | | | 2 | N N 0 REFUELING | 0 REFUELING | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | UNIT 2 DIESEL GENERATOR AUTO STARTED DUE TO LOSS OF A 4 KV BUS. | | | | DURING AN OUT OF SERVICE EVOLUTION, AN EQUIPMENT OPERATOR INADVERTENTLY | | OPENED THE WRONG POTENTIAL FUSE DRAWER ON A 4KV BUS, CAUSING THE 4KV BUS | | AND ALL OF ITS SUB-BUSES TO BECOME DEENERGIZED. THE UNIT 2 D/G AUTO | | STARTED AND CLOSED IN TO THE ECCS BUS. DUE TO THE PLANT'S ELECTRICAL BUS | | LINEUP, BOTH RPS BUSES WERE LOST. THE REACTOR BUILDING VENTILATION ISOLATED | | AND THE STANDBY GAS TREATMENT SYSTEM AUTO STARTED. THE POTENTIAL FUSES WERE | | RECLOSED AND THE ELECTRICAL SYSTEMS REALIGNED TO THEIR PREVIOUS POSITIONS | | WITHIN 50 MINUTES. THE RI WAS INFORMED. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 28766 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: BROWNS FERRY REGION: 2 |NOTIFICATION DATE: 05/05/95 | |UNIT: [1] [2] [3] STATE: AL |NOTIFICATION TIME: 09:55 [ET]| |RX TYPE: [1] GE-4,[2] GE-4,[3] GE-4 |EVENT DATE: 05/05/95 | +------------------------------------------------+EVENT TIME: 10:00[CDT]| |NRC NOTIFIED BY: SMITH |LAST UPDATE DATE: 05/05/95 | |HQ OPS OFFICER: CHAUNCEY GOULD +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |MARK LESSER RDO | |NINF INFORMATION ONLY | | | | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |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 100 POWER OPERATION | 100 POWER OPERATION | | 3 | N N 0 REFUELING | 0 REFUELING | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | THE LICENSEE MADE AN INFORMATION CALL TO INFORM THE NRC THAT THEY WERE | | GOING TO SOUND THEIR EMERGENCY SIRENS AT 10:00 AS PART OF A POST | | MAINTENANCE ACTIVITY. THEY HAVE NOTIFIED THE STATE AND THE RESIDENT. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 28767 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: BRAIDWOOD REGION: 3 |NOTIFICATION DATE: 05/05/95 | |UNIT: [1] [ ] [ ] STATE: IL |NOTIFICATION TIME: 13:02 [ET]| |RX TYPE: [1] W-4-LP,[2] W-4-LP |EVENT DATE: 05/05/95 | +------------------------------------------------+EVENT TIME: 11:10[CDT]| |NRC NOTIFIED BY: ZOLAN |LAST UPDATE DATE: 05/05/95 | |HQ OPS OFFICER: BOB STRANSKY +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |GEOFFREY WRIGHT 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 | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | CONTAINMENT SPRAY ADDITIVE SYSTEM ISOLATED DUE TO OPERATOR ERROR | | | | THE FOLLOWING IS TEXT OF A FACSIMILE SUBMITTED BY THE LICENSEE: | | "ON APRIL 18, 1995 AT 0243 CDT THE SPRAY ADDITIVE SYSTEM THAT SUPPLIES NaOH | | TO BOTH TRAINS OF CONTAINMENT SPRAY (CS) WAS ISOLATED TO BOTH TRAINS OF CS | | DUE TO AN OPERATOR VALVING ERROR FOR A PERIOD OF APPROXIMATELY TEN MINUTES. | | AT THE TIME THIS WAS IDENTIFIED, A SEVEN DAY LCOAR (LCO ACTION REQUIREMENT) | | FOR THE SPRAY ADDITIVE SYSTEM WAS PROPERLY ENTERED AND FOLLOWED. NO LOCAR | | WAS ENTERED FOR THE CONTAINMENT SPRAY SYSTEM, AS IT IS COVERED BY A | | SEPARATE TECHNICAL SPECIFICATION. | | | | AT 1110 CDT ON MAY 5, 1995, IT WAS CONCLUDED BY THE SITE ENGINEERING | | DEPARTMENT THAT THE PRESENT LICENSING AND DESIGN BASES DO NOT SUPPORT THE | | INDEPENDENCE OF THE CS AND SPRAY ADDITIVE SYSTEM TECHNICAL SPECIFICATIONS. | | SPECIFICALLY, ANALYSES WERE NOT IN PLACE TO SUPPORT THE LOWER CALCULATED | | LONG TERM pH VALUES IN THE CONTAINMENT SUMP WITH THE SPRAY ADDITIVE SYSTEM | | UNAVAILABLE. THE ANALYSES THAT HAVE BEEN PERFORMED TO DATE SUPPORT A | | REVISION TO THE TECHNICAL SPECIFICATIONS, SUCH AS A CONCENTRATION CHANGE | | FOR THE SPRAY ADDITIVE TANKS. ENGINEERING BELIEVES THAT WITH ADDITIONAL | | ANALYSES, INDEPENDENCE WOULD PROBABLY BE PROVEN FOR THE EXISTING 7 DAY CS | | LOCAR TIME. ADDITIONAL DISCUSSIONS WILL BE HELD TO DETERMINE THE NEXT | | COURSE OF ACTION. | | | | AS AN INTERIM MEASURE, A TEMPORARY PROCEDURE CHANGE IS BEING INITIATED TO | | IDENTIFY THAT THE ASSOCIATED TRAIN OF CONTAINMENT SPRAY INOPERABILITY | | REQUIREMENTS MUST BE SATISFIED WHENEVER THE SPRAY ADDITIVE SYSTEM TECHNICAL | | SPECIFICATION IS ENTERED." | | THE NRC RESIDENT INSPECTOR HAS BEEN INFORMED. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 28768 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: MILLSTONE REGION: 1 |NOTIFICATION DATE: 05/05/95 | |UNIT: [1] [ ] [ ] STATE: CT |NOTIFICATION TIME: 14:45 [ET]| |RX TYPE: [1] GE-3,[2] CE,[3] W-4-LP |EVENT DATE: 05/05/95 | +------------------------------------------------+EVENT TIME: 14:34[EDT]| |NRC NOTIFIED BY: SILKO |LAST UPDATE DATE: 05/05/95 | |HQ OPS OFFICER: DOUG WEAVER +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |RICHARD CONTE RDO | |AINA 50.72(b)(2)(iii)(A) POT UNABLE TO SAFE SD | | | | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | 1 | N Y 100 POWER OPERATION | 100 POWER OPERATION | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | AN ERROR EXISTS IN A FIRE RECOVERY PROCEDURE WHICH WOULD HAVE RENDERED SOME | | REACTOR PRESSURE MONITORING INSTRUMENTATION INOPERABLE | | | | AN ERROR IN ONE OF THE FIRE RECOVERY PROCEDURES HAS BEEN IDENTIFIED WHICH | | COULD HAVE CAUSED THE LOSS OF CERTAIN INSTRUMENTATION. SPECIFICALLY, THE | | FIRE RECOVERY PROCEDURE COULD HAVE DISABLED THE REACTOR PRESSURE | | INSTRUMENTATION WHICH IS USED TO MONITOR THE UNIT SHUTDOWN FOLLOWING A | | FIRE. CORRECTIVE ACTIONS ARE IN PROGRESS. | | | | OTHER REACTOR PRESSURE INDICATIONS WOULD HAVE BEEN AVAILABLE TO SAFELY | | SHUTDOWN THE REACTOR. HOWEVER, SOME EXPECTED PRESSURE INDICATIONS WOULD | | NOT HAVE BEEN AVAILABLE. | | | | APPROPRIATE STATE AND LOCAL OFFICIALS WERE NOTIFIED. THE LICENSEE | | INFORMED THE NRC RESIDENT INSPECTOR. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 28769 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: CALVERT CLIFFS REGION: 1 |NOTIFICATION DATE: 05/05/95 | |UNIT: [1] [2] [ ] STATE: MD |NOTIFICATION TIME: 15:06 [ET]| |RX TYPE: [1] CE,[2] CE |EVENT DATE: 05/05/95 | +------------------------------------------------+EVENT TIME: 15:06[EDT]| |NRC NOTIFIED BY: CRAIG SLY |LAST UPDATE DATE: 05/05/95 | |HQ OPS OFFICER: DOUG WEAVER +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |RICHARD CONTE RDO | |CDEF 21.21(b)(2) DEFECTS/NONCOMPLIANCE | | | |VERNON HODGE NRR | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |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 COLD SHUTDOWN | 0 COLD SHUTDOWN | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | PART 21 - HIGHER THAN EXPECTED FAILURE RATE OF FUSES | | | | THE PART 21 NOTIFICATION DISCUSSES A RECENTLY DISCOVERED FAILURE MECHANISM | | FOR GOULD-SHAWMUT A25X 10 - 15 AMPERE FUSES. THE FUSES HAVE EXPERIENCED A | | HIGHER THAN EXPECTED FAILURE RATE OVER THE LAST FIVE MONTHS. INVESTIGATION | | INTO THE PROBLEM HAS REVEALED A CERTAIN PERCENTAGE OF THESE FUSES HAVE | | DEVELOPED CRACKS IN THEIR FUSE ELEMENTS. | | | | BETWEEN NOVEMBER '94 AND MARCH '95 FIVE FAILURES OF THESE FUSES HAVE BEEN | | DOCUMENTED. THE PLANT HAS SEVERAL HUNDRED OF THESE FUSES INSTALLED IN | | SAFETY RELATED AC BUSES. THE EXACT AGE OF THE FUSES IS UNKNOWN. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |OTHER NUCLEAR MATERIAL | |EVENT NUMBER: 28770 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |LICENSEE: METOREX |NOTIFICATION DATE: 05/05/95 | | CITY: LANGHORN REGION: 1 |NOTIFICATION TIME: 16:01 [ET]| | COUNTY: BUCKS STATE: PA |EVENT DATE: 04/20/95 | |LICENSE#: 37-28461-01 AGREEMENT: N |EVENT TIME: 12:00[EDT]| | DOCKET: |LAST UPDATE DATE: 05/05/95 | | +-----------------------------+ | |PERSON ORGANIZATION| | |RICHARD CONTE RDO | | | | +------------------------------------------------+ | |NRC NOTIFIED BY: STAN PIOREK | | |HQ OPS OFFICER: DOUG WEAVER | | +------------------------------------------------+ | |EMERGENCY CLASS: NOT APPLICABLE | | |10 CFR SECTION: | | |BAB2 20.2201(a)(1)(ii) LOST/STOLEN LNM>10X | | | | | | | | | | | | | | +------------------------------------------------+-----------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | METOREX PACKAGE CONTAINING 40 mCi OF Fe-55 IS MISSING (SHIPPED VIA UPS) | | | | METOREX SHIPPED A PACKAGE VIA UPS CONTAINING A 40 mCi Fe-55 SOURCE. THE | | PACKAGE WAS SHIPPED 4/20/95 TO A GM PLANT IN OHIO AND IS NOW MISSING. THE | | SOURCE IS AN AMERSHAM SEALED SOURCE AND REPRESENTS NO PERSONNEL HAZARD | | UNLESS THE SOURCE IS DISMANTLED. THE SOURCE IS A LOW ENERGY X-RAY EMITTER. | | | | UPS IS STILL LOOKING FOR THE SOURCE. CONTACT PHONE NUMBERS ARE AVAILABLE | | IN THE HOO LOG. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 28771 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: SALEM REGION: 1 |NOTIFICATION DATE: 05/05/95 | |UNIT: [1] [ ] [ ] STATE: NJ |NOTIFICATION TIME: 18:21 [ET]| |RX TYPE: [1] W-4-LP,[2] W-4-LP |EVENT DATE: 05/05/95 | +------------------------------------------------+EVENT TIME: 04:21[EDT]| |NRC NOTIFIED BY: SAUER |LAST UPDATE DATE: 05/05/95 | |HQ OPS OFFICER: DOUG WEAVER +-----------------------------+ +------------------------------------------------+ 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 Y 58 POWER OPERATION | 58 POWER OPERATION | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | ALL THREE EDGs SYNCHRONIZED TO THE GRID AT THE SAME TIME DURING TESTING | | | | ALL THREE EDGs WERE SYNCHRONIZED TO THE ELECTRICAL GRID AT THE SAME TIME | | DURING TESTING. THIS IS NOT IN COMPLIANCE WITH REG GUIDE 1.108 "PERIODIC | | TESTING OF DIESEL GENERATOR UNITS USED AS ONSITE ELECTRICAL POWER SYSTEMS | | AT NUCLEAR PLANTS" AS CALLED FOR IN THE TECH SPEC BASES. THE POTENTIAL FOR | | A COMMON MODE FAILURE OF ALL THREE EDGs EXISTS FOR AN ELECTRICAL GRID | | FAULT. | | | | THE EDGs WERE BEING RUN TO COMPLY WITH THE ACTIONS OF LCO 3.8.1.1 AS A | | RESULT OF THE INOPERABILITY OF THE #1B EDG FOR WHAT WAS ORIGINALLY | | PREVENTIVE MAINTENANCE. PROBLEMS ENCOUNTERED WITH DIESEL CYLINDER AND | | GENERATOR TEMPERATURE INDICATIONS WERE DETERMINED TO BE CORRECTIVE | | MAINTENANCE AND, AS SUCH, REQUIRED RUNNING THE EDGs WITHIN 24 HOURS. | | LATER INVESTIGATION CONCLUDED THAT THE 24 HOUR CLOCK SHOULD HAVE STARTED AT | | THE TIME PREVENTIVE MAINTENANCE WAS CHANGED TO CORRECTIVE MAINTENANCE. | | LOWER ALLOWAYS CREEK TOWNSHIP AND THE NRC RESIDENT INSPECTOR WERE NOTIFIED. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 28772 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: COMANCHE PEAK REGION: 4 |NOTIFICATION DATE: 05/05/95 | |UNIT: [1] [2] [ ] STATE: TX |NOTIFICATION TIME: 22:33 [ET]| |RX TYPE: [1] W-4-LP,[2] W-4-LP |EVENT DATE: 05/05/95 | +------------------------------------------------+EVENT TIME: 20:09[CDT]| |NRC NOTIFIED BY: MIKE SMITH |LAST UPDATE DATE: 05/05/95 | |HQ OPS OFFICER: DOUG WEAVER +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |WILLIAM JOHNSON RDO | |ARPS 50.72(b)(2)(ii) RPS ACTUATION | | |AESF 50.72(b)(2)(ii) ESF ACTUATION | | |ANLI 50.72(b)(1)(iii) LIGHTNING | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |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 | | 2 | A/R Y 100 POWER OPERATION | 0 HOT STANDBY | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | DUAL UNIT TRIP DUE TO LIGHTNING STRIKE | | | | BOTH UNITS TRIPPED FROM 100% POWER SIMULTANEOUSLY AT 2009 CDT. THE STATION | | WAS UNDER A SEVERE THUNDERSTORM WARNING AND A TORNADO WATCH WHEN THE TRIPS | | OCCURRED. LIGHTNING STRUCK THE PLANT AT THE TIME OF THE TRIPS AND LICENSEE | | SUSPECTS THAT LIGHTNING STRUCK THE ROD CONTROL SYSTEMS. BOTH UNITS TRIPPED | | ON HIGH POWER RANGE FLUX RATE SIGNAL. THE EXACT CAUSE OF THE TRIPS IS | | BEING INVESTIGATED. | | | | ALL RODS FULLY INSERTED AND THE POST TRIP RESPONSE WAS NORMAL FOR BOTH | | UNITS. BOTH MAIN CONDENSERS ARE AVAILABLE FOR DECAY HEAT REMOVAL. ALL | | EMERGENCY DIESEL GENERATORS ARE AVAILABLE AS IS OFFSITE POWER. ALL ECCS | | EQUIPMENT IS OPERABLE. THERE WAS NO DAMAGE TO SAFETY RELATED EQUIPMENT | | AND NO PERSONNEL WERE INJURED. | | | | LICENSEE EXPECTS TO RESTART UNIT 1 ON 05/06/95. LICENSEE EXPECTS TO REPAIR | | A BONNET LEAK ON A CVCS VALVE AND RESTART UNIT 2 ON 05/10/95. | | | | THE LICENSEE INFORMED THE NRC RESIDENT INSPECTOR. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 28773 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: SOUTH TEXAS REGION: 4 |NOTIFICATION DATE: 05/07/95 | |UNIT: [ ] [2] [ ] STATE: TX |NOTIFICATION TIME: 22:20 [ET]| |RX TYPE: [1] W-4-LP,[2] W-4-LP |EVENT DATE: 05/07/95 | +------------------------------------------------+EVENT TIME: 20:22[CDT]| |NRC NOTIFIED BY: JOHN CRAIN |LAST UPDATE DATE: 05/07/95 | |HQ OPS OFFICER: DOUG WEAVER +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |WILLIAM JOHNSON RDO | |AESF 50.72(b)(2)(ii) ESF ACTUATION | | | | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |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 +------------------------------------------------------------------------------+ | ESF ACTUATION - EDG #22 STARTED FOR UNKNOWN REASONS | | | | EMERGENCY DIESEL GENERATOR #22 AUTO STARTED AT 2022 CDT IN THE NORMAL MODE. | | THE EDG DID NOT LOAD ON TO ITS EMERGENCY BUS. ALL SUPPORT SYSTEMS | | FUNCTIONED NORMALLY. THE EDG WAS MANUALLY SECURED AT 2032 AFTER COOLDOWN | | AND IS NOW IN STANDBY. | | | | THE CAUSE OF THE AUTO START IS BEING INVESTIGATED. A RECENT SIMILAR | | OCCURRENCE ON THE #21 EDG WAS REPAIRED BY REPLACING SEVERAL FIBER OPTIC | | BOARDS. THE EDG IS CONSIDERED OPERABLE. | | | | SEE THE FOLLOWING RELATED EVENTS: #26854, 27185, 27243, 27257, 27366, | | 27571, & 28762. | | | | THE LICENSEE INFORMED THE NRC RESIDENT INSPECTOR. | +------------------------------------------------------------------------------+