ML11187A277
| ML11187A277 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 08/10/2011 |
| From: | NRC/SECY |
| To: | |
| Rihm R, OEDO, 415-1717 | |
| Shared Package | |
| ML11187A149 | List: |
| References | |
| G20110354, LTR-11-0290, SECY-2011-0290, CORR-11-0087 | |
| Download: ML11187A277 (76) | |
Text
Unplanned Scrams 2000 - Present be r um n tN tio ep cr ip or n /D tR atio es E DA Even ifi se NA TE c OD Ca M DO CK ns tN E u PL EN ET ee ot M AM NO AN T RE Ev UN Sc T EV GI ON Lic en IT SC ram TE S
e R THE REACTOR WAS MANUALLY TRIPPED WHEN IT WAS DETERMINED THAT A REACTOR COOLANT PUMP SEAL WAS DEGRADED AND A SMALL FIRE WAS REPORTED IN THE HP TURBINE ENCLOSURE AT ARKANSAS 1 04/18/10 313 4 3132010003 45854 OPERATE MAN GOVERNOR VALVE 3.
DURING A HEAT BALANCE FOR NI CALIBRATION, AN AUTOMATIC ROD WITHDRAWL OCCURRED. THIS RESULTED IN ONE CHANNEL OF HIGH REACTOR POWER TRIPPING SIMULTANEOUSLY WITH A CHANNEL OF HIGH RCS PRESSURE. THE ROOT CAUSE WAS FAILURE TO FOLLOW ARKANSAS 1 04/25/10 313 4 3132010004 45872 OPERATE AUTO PROCEDURES. .
THE REACTOR WAS MANUALLY TRIPPED DUE TO HIGH CRDM TEMPERATURES. THE HIGH TEMPERATURES WERE CAUSED BY LOSS ARKANSAS 1 02/05/09 313 4 3132009001 44831 OPERATE MAN OF INTERMEDIATE COOLING WATER FLOW.
THE REACTOR WAS MANUALLY TRIPPED DUE TO A FIRE IN THE TURBINE BUILDING. THE CAUSE OF THE FIRE WAS A FAILED MANUAL VALVE BONNET ON THE HYDROGEN SYSTEM NEAR THE HYDROGEN ADD STATION. THE VALVE FAILED DUE TO OPERATOR ERROR IN ARKANSAS 1 02/07/09 313 4 3132009002 44837 OPERATE MAN OPERATING THE VALVE.
WHILE HOLDING POWER AT 32% FOR NUCLEAR INSTRUMENT CALIBRATIONS, THE REACTOR WAS MANUALLY TRIPPED UPON RECEIPT OF AN ASYMMETRIC ROD ALARM WITH AN ABNORMAL ROD ARKANSAS 1 12/12/08 313 4 3132008001 44716 OPERATE MAN PATTERN AND LOWERING REACTOR POWER NOTED.
THE REACTOR WAS MANUALLY TRIPPED FROM 100% POWER WHEN ARKANSAS 1 12/20/08 313 4 3132008001 44736 OPERATE MAN AN ASYMMETRIC ROD ALARM WAS RECEIVED.
A TURBINE/RX TRIP OCCURRED ON LOW TURBINE BEARING LUBE OIL PRESSURE. THE CAUSE WAS A FAILED LUBE OIL EJECTOR DISCHARGE ARKANSAS 1 12/26/05 313 4 3132005003 42229 OPERATE AUTO CHECK VALVE RESULTING IN BLOCKAGE OF LUBE OIL FLOW.
A RX/TURBINE TRIP OCCURRED ON HIGH RCS PRESSURE FOLLOWING THE INADVERTENT CLOSURE OF THE MAIN TURBINE GOVERNOR VALVES. THE CAUSE WAS MOST LIKELY A LIGHTNING INDUCED EHC ARKANSAS 1 08/29/03 313 4 3132003001 40119 OPERATE AUTO SYSTEM MALFUNCTION.
A TURBINE/RX TRIP OCCURRED DURING A MAIN TURBINE OVERSPEED TRIP TEST. THE CAUSE WAS BINDING OF THE MECHANICAL TRIP SPOOL VALVE IN A PARTIALLY TRIPPED CONDITION ARKANSAS 1 10/04/02 313 4 3132002002 39248 OPERATE AUTO DUE TO INADEQUATE PREVENTIVE MAINTENANCE.
THE RX WAS MANUALLY TRIPPED DUE TO AN EXCESSIVE MAIN TURBINE GENERATOR HYDROGEN LEAK. THE CAUSE WAS A FAILED PIPE SUPPORT THAT ALLOWED EXCESSIVE VIBRATION AND ULTIMATE ARKANSAS 1 01/05/01 313 4 3132001001 37650 OPERATE MAN FAILURE OF A HYDROGEN VENT PIPE.
A RX TRIP OCCURRED ON HIGH RX COOLANT SYSTEM PRESSURE FOLLOWING RAPID CLOSURE OF THE MAIN TURBINE GOVERNOR VALVES. THE CAUSE WAS FAILURE OF A CARD IN THE MAIN TURBINE ARKANSAS 1 07/24/01 313 4 3132001004 38165 OPERATE AUTO EHC SYSTEM.
THE RX WAS MANUALLY TRIPPED IN RESPONSE TO THE RAPID CLOSURE OF THE MAIN TURBINE STEAM SUPPLY VALVES. THE CAUSE WAS A STUCK CONTACT IN THE VALVE POSITION LIMIT LOWER ARKANSAS 1 03/14/00 313 4 3132000004 36791 OPERATE MAN PUSHBUTTON SWITCH.
be r um n tN tio ep cr ip or n /D tR atio es E DA Even ifi se NA TE c OD Ca M DO CK ns tN E u PL EN ET ee ot M AM NO AN T RE Ev UN Sc T EV GI ON Lic en IT SC ram TE S
e R WITH POWER REDUCED TO 84% DUE TO SECURING A MAIN FEED PUMP BECAUSE OF BEARING DEGRADATION, A FAILURE OF A MAIN FEEDWATER REG VALVE CAUSED SG LEVEL TO LOWER. THE REACTOR WAS MANUALLY SCRAMMED. THE LIKELY CAUSE WAS FOREIGN ARKANSAS 2 03/13/09 368 4 3682009001 44906 OPERATE MAN MATERIAL THE MFRV IP CONVERTER.
A MAIN FEEDWATER PUMP WAS TRIPPED DUE TO HIGH BEARING TEMPERATURE. THIS WAS FOLLOWED BY A MANUAL REACTOR TRIP DUE TO LOWERING STEAM GENERATOR LEVELS. THE HIGH BEARING TEMP WAS CAUSED BY EXCESSIVE THRUST LOADING DUE TO ARKANSAS 2 12/08/09 368 4 3682009005 45549 OPERATE MAN DEGRADATION OF THE PUMP INTERNALS.
A TURBINE/RX TRIP RESULTED FROM FAILURE OF THE MAIN GENERATOR REVERSE POWER RELAY. THE ROOT CAUSE OF THE RELAY FAILURE IS INDETERMINATE PENDING COMPLETION OF INSPECTION ARKANSAS 2 12/19/02 368 4 3682002002 39460 OPERATE AUTO AND TESTING BY THE MANUFACTURER.
A RX TRIP OCCURRED ON A CORE PROTECTION CALCULATOR TRIP WHEN AN OPERATOR INADVERTENTLY INSERTED A GROUP OF RODS INSTEAD OF A SINGLE ROD WHILE TROUBLESHOOTING A DROPPED ARKANSAS 2 11/01/01 368 4 3682001002 38457 OPERATE AUTO ROD.
THE REACTOR TRIPPED FOLLOWING A TURBINE TRIP. THE TURBINE TRIPPED ON LOW CONDENSER VACUUM CAUSED BY A LOSS OF NON-1E ELECTRICAL SWITCHGEAR DUE TO INADVERTENT OPERATION OF VOGTLE 1 12/07/09 424 2 4242009002 45547 OPERATE AUTO THE CONTROL ROOM HANDSWITCH.
WHILE ATTEMPTING TO BRING THE MAIN TURBINE ONLINE, HIGH TURBINE VIBRATIONS RESULTED IN A MANUAL TURBINE TRIP REQUIRING THE SUBSEQUENT BREAKING OF CONDENSER VACUUM.
THE REACTOR WAS TRIPPED IN ANTICIPATION OF LOSS OF VOGTLE 1 12/09/09 424 2 4242009003 45557 OPERATE MAN FEEDWATER.
THE RX WAS MANUALLY TRIPPED AFTER A FEED REGULATING VALVE FAILED TO CONTROL SG WATER LEVEL. THE LICENSEE IS VOGTLE 1 04/17/06 424 2 4242006001 42506 OPERATE MAN INVESTIGATING THE CAUSE.
A TURBINE/RX TRIP OCCURRED ON GENERATOR PROTECTIVE RELAYING. THE CAUSE WAS AN INVALID FAULT RESULTING WHEN A HIGH RESISTANCE CONNECTION DEVELOPED OVER TIME ON A VOGTLE 1 01/11/05 424 2 4242005001 41323 OPERATE AUTO PROTECTIVE RELAY.
A RX TRIP OCCURRED ON LOW SG WATER LEVEL AFTER THE FEED REGULATING VALVE SHUT UNEXPECTEDLY WHILE REPLACING A FAILED SGWLC CARD. THE CAUSE WAS AN INADEQUATE REPAIR VOGTLE 1 04/29/05 424 2 4242005003 41653 OPERATE AUTO PROCEDURE.
THE RX WAS MANUALLY TRIPPED ON LOWERING SG WATER LEVEL AFTER A MAIN FEEDWATER REGULATING VALVE FAILED CLOSED. THE CAUSE WAS AN ELECTRONIC CIRCUIT BOARD FAILURE RESULTING FROM MOISTURE INTRUSION INTO THE VALVE'S ELECTRO-VOGTLE 1 10/17/05 424 2 4242005004 42058 OPERATE MAN PNEUMATIC TRANSDUCER.
THE RX WAS MANUALLY TRIPPED FOLLOWING A LOSS OF FEEDWATER PUMP SPEED CONTROL. THE CONTROL VALVE HYDRAULIC VOGTLE 1 03/27/04 424 2 4242004001 40615 OPERATE MAN OPERATING CYLINDER STUCK OPEN DUE TO MISALIGNED BUSHINGS.
THE RX WAS MANUALLY TRIPPED IN ANTICIPATION OF LOW SG LEVEL FOLLOWING A LOSS OF FEEDWATER. THE FEEDWATER TRIP OCCURRED ON HIGH WATER LEVEL FOLLOWING A FEEDWATER VOGTLE 1 04/20/02 424 2 4242002003 38867 OPERATE MAN TRANSIENT MADE WORSE BY OPERATOR ERRORS.
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be r um n tN tio ep cr ip or n /D tR atio es E DA Even ifi se NA TE c OD Ca M DO CK ns tN E u PL EN ET ee ot M AM NO AN T RE Ev UN Sc T EV GI ON Lic en IT SC ram TE S
e R A TURBINE/RX TRIP OCCURRED ON A LOSS OF MAIN GENERATOR EXCITATION WHILE A GENERATOR RECTIFIER BANK WAS BEING PLACED BACK INTO SERVICE FOLLOWING REPAIRS. THE CAUSE WAS A VOGTLE 1 08/24/01 424 2 4242001001 38234 OPERATE AUTO FAILED SCR IN ANOTHER RECTIFIER BANK. NO CHANGES PER LER REV 01 THE RX WAS MANUALLY TRIPPED FOLLOWING THE CLOSURE OF AN MSIV. THE CLOSURE RESULTED FROM A BLOWN FUSE. THE CAUSE OF VOGTLE 1 06/05/00 424 2 4242000002 37058 OPERATE MAN THE FUSE FAILURE IS UNKNOWN.
A RX TRIP OCCURRED WHILE PERFORMING SOLID STATE PROTECTION SYSTEM AND RX TRIP BREAKER TESTING. THE CAUSE WAS AN INADEQUATE PROCEDURAL CHANGE WHICH HAD BEEN RECENTLY VOGTLE 1 12/09/00 424 2 4242000004 37583 OPERATE AUTO IMPLEMENTED.
THE REACTOR WAS MANUALLY TRIPPED DUE TO LOSS OF INSTRUMENT AIR TO THE TURBINE BUILDING. THE INSTRUMENT AIR LOSS WAS CAUSED BY AN INAPPROPRIATE LINEUP WHILE RESTORING VOGTLE 2 12/23/09 425 2 4252009001 45588 OPERATE MAN AN INSTRUMENT AIR DRYER TO SERVICE FOLLOWING MAINTENANCE.
A GENERATOR NEUTRAL GROUND RELAY ACTUATED CAUSING A VOGTLE 2 04/23/07 425 2 4252007002 43313 OPERATE AUTO TURBINE TRIP AND SUBSEQUENT REACTOR TRIP.
A REACTOR COOLANT PUMP TRIPPED, RESULTING IN A LOW FLOW VOGTLE 2 08/27/06 425 2 4252006003 42806 OPERATE AUTO REACTOR SCRAM.
A RX TRIP OCCURRED ON A GENERAL WARNING WHEN AN OPERATOR ERRONEOUSLY OPERATED THE OPPOSITE TRAIN TEST VOGTLE 2 11/20/04 425 2 4252004004 41213 OPERATE AUTO SWITCH DURING SSPS AND RX TRIP BREAKER SURVEILLANCE.
THE RX WAS MANUALLY TRIPPED WHEN HIGH SG WATER LEVEL TRIPPED THE MAIN TURBINE AND MAIN FEEDWATER. THE CAUSE WAS FAILURE OF THE SGWL CONTROL OPERATOR TO FOLLOW PROCEDURE WHILE TRANSFERING TO THE MAIN FEEDWATER VOGTLE 2 11/13/02 425 2 4252002002 39367 OPERATE MAN REGULATING VALVES.
THE RX WAS MANUALLY TRIPPED ON A LOSS OF FEEDWATER FLOW WHILE TESTING THE FEEDWATER PUMP TRIP SIGNAL. THE LINK THAT DISABLES THE TRIP SIGNAL WAS NOT FULLY OPENED, ALLOWING THE VOGTLE 2 04/07/01 425 2 4252001001 37898 OPERATE MAN TRIP SIGNAL TO TRIP THE OPERATING FEED PUMP.
FOLLOWING LOSS OF A REACTOR FEEDWATER PUMP WITH FAILURE OF THE RECIRC PUMPS TO RUN BACK, THE REACTOR TRIPPED ON LOW REACTOR WATER LEVEL. THE CAUSE OF THE FEEDWATER PUMP TRIP WAS A PULSATION DAMPER INSTALLED IN THE RFP FLOW BRUNSWICK 1 05/05/10 325 2 3252010003 45902 OPERATE AUTO SENSING LINE.
AN APPARENT MALFUNCTION OF THE EHC WHILE SYNCHRONIZING THE MAIN GENERATOR TO THE GRID RESULTED IN THE MSIVS GOING BRUNSWICK 1 11/26/08 325 2 3252008007 44685 OPERATE AUTO CLOSED AND A SUBSEQUENT AUTOMATIC REACTOR SCRAM.
A TURBINE/RX TRIP OCCURRED WHEN ONE PHASE OF THE GENERATOR NO-LOAD DISCONNECT SWITCH SHORTED TO GROUND.
THE CAUSE WAS INADEQUATE DESIGN AND TESTING OF THE SWITCH BY THE VENDOR; RESULTING IN THE SWITCH NOT MEETING ITS BRUNSWICK 1 07/13/05 325 2 3252005005 41837 OPERATE AUTO NAMEPLATE DESIGN RATING.
THE RX WAS MANUALLY SCRAMMED FOLLOWING A LOSS OF OFFSITE POWER AND RESULTING LOSS OF RX RECIRCULATION PUMPS. THE CAUSE WAS A SWITCHYARD BREAKER FAILURE AND BREAKER SCHEME IN AFFECT DURING AN OFFSITE WEATHER RELATED BRUNSWICK 1 08/14/04 325 2 3252004002 40954 OPERATE MAN TRANSMISSION LINE FAULT.
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be r um n tN tio ep cr ip or n /D tR atio es E DA Even ifi se NA TE c OD Ca M DO CK ns tN E u PL EN ET ee ot M AM NO AN T RE Ev UN Sc T EV GI ON Lic en IT SC ram TE S
e R A RX TRIP OCCURRED ON LOW RX VESSEL WATER LEVEL FOLLOWING A FEED PUMP TRIP. THE CAUSE WAS INSUFFICIENT LUBE OIL PRESSURE MARGIN ON THE RX FEED PUMP BEARING HEADER AFTER BRUNSWICK 1 01/12/03 325 2 3252003001 39504 OPERATE AUTO THE RUNNING FEEDPUMP LUBE OIL PUMP TRIPPED.
A MALFUNCTION OF THE ELECTRO-HYDRAULIC CONTROL SYSTEM CAUSED THE TURBINE BYPASS VALVES TO CYCLE. THE REACTOR THE EXACT CAUSE OF THE REACTOR TRIP IS NOT CERTAIN.
AUTOMATICALLY TRIPPED JUST PRIOR TO BEING MANUALLY TRIPPED. THE MOST PROBABLE CAUSE WAS A SHORT IN THE MAIN THE TRIP WAS PROBABLY DUE TO A SHORT IN THE MAIN GENERATOR'S CURRENT MONITORING CIRCUIT RESULTING BRUNSWICK 2 08/30/08 324 2 3242008001 44453 OPERATE AUTO GENERATOR'S CURRENT MONITOR CIRCUIT. IN A TURBINE TRIP.
AN SRV SPURIOUSLY OPENED AND WOULD NOT SHUT. THE REACTOR WAS MANUALLY TRIPPED WHEN TORUS TEMPERATURE REACHED BRUNSWICK 2 11/09/08 324 2 3242008002 44647 OPERATE MAN 109.8-DEGREES.
THE REACTOR WAS MANUALLY SCRAMMED FOLLOWING LOSS OF THE BRUNSWICK 2 11/01/06 324 2 3242006001 42955 OPERATE MAN STARTUP AUXILIARY TRANSFORMER.
THE REACTOR SCRAMMED ON NEUTRON MONITORING THE REACTOR TRIPPED UPON RECEIPT OF TWO CHANNELS OF OPRM SYSTEM OSCILLATION POWER RANGE MONITORS (OPRM)
BRUNSWICK 2 12/25/06 324 2 3242006003 43062 OPERATE AUTO NEUTRON MONITORING TRIP SIGNALS. TRIP SIGNALS.
DURING STARTUP AT 1% POWER, THE REACTOR WAS MANUALLY TRIPPED DUE TO HIGH CONDUCTIVITY IN THE CONDENSER. THE CAUSE OF THE HIGH CONDUCTIVITY WAS LEAKING TUBES DUE TO BRUNSWICK 2 11/11/06 324 2 3242006002 42986 STARTUP MAN MISSING TUBE PLUGS.
A RX SCRAM OCCURRED ON LOW RX WATER LEVEL AFTER THE ONLY OPERATING FEEDPUMP TRIPPED ON LOW SUCTION PRESSURE DURING POWER ASCENSION TESTING. THE CAUSE WAS NO PROCEDURAL GUIDANCE EXISTED FOR LIMITING CONDENSATE BRUNSWICK 2 04/09/05 324 2 3242005002 41582 OPERATE AUTO SYSTEM FLOW RATE DURING THE TESTING.
A RX SCRAM OCCURRED ON AN MSIV CLOSURE AFTER AN ELECTROHYDRAULIC CONTROL MALFUNCTION CAUSED THE MAIN TURBINE BYPASS VALVES TO OPEN. THE CAUSE WAS AN INTERMITTENT ERROR SIGNAL FROM AN EHC CARD THAT WAS BRUNSWICK 2 04/04/03 324 2 3242003003 39733 OPERATE AUTO IMPROPERLY ENGAGED IN ITS HARDWARE SLOT.
A TURBINE/RX TRIP OCCURRED ON LOSS OF EXCITATION. THE CAUSE WAS FAILURE OF THE GENERATOR EXCITER INNER COLLECTOR RING AND BRUSH HOLDERS WHICH RESULTED FROM A FABRICATION BRUNSWICK 2 11/04/03 324 2 3242003004 40297 OPERATE AUTO DEFICIENCY AT INITIAL INSTALLATION.
THE RX WAS MANUALLY SCRAMMED FOLLOWING A TURBINE EHC SYSTEM FAILURE. THE CAUSE WAS AN INTERMITTENT ELECTRICAL CONNECTION THAT RESULTED IN A FALSE HIGH TURBINE SPEED BRUNSWICK 2 02/23/01 324 2 3242001001 37777 OPERATE MAN SIGNAL AND TURBINE TRIP.
A TURBINE TRIP/RX SCRAM OCCURRED FOLLOWING A MAIN TRANSFORMER FAULT. THE TRANSFORMER FAULT RESULTED FROM A LOSS OF COOLING. THE BREAKER SUPPLYING POWER TO THE BRUNSWICK 2 09/22/00 324 2 3242000002 37364 OPERATE AUTO COOLING COMPONENTS TRIPPED FOR UNKNOWN REASONS.
THE RX TRIPPED FOLLOWING A MAIN TURBINE TRIP. THE TURBINE TRIP WAS CAUSED BY A POWER LOAD UNBALANCED SIGNAL DUE TO A NEUTRAL OVER VOLTAGE CONDITION. THE CAUSE OF THE TRIP WAS A GROUND CAUSED BY WATER ENTRAINED IN THE ISOPHASE BROWNS FERRY 1 02/18/09 259 2 2592009001 44860 OPERATE AUTO BUS DUCT COOLING SYSTEM.
THE REACTOR WAS MANUALLY TRIPPED DURING STARTUP DUE TO AN OIL LEAK IN THE MAIN TURBINE ELECTRO-HYDRAULIC CONTROL BROWNS FERRY 1 05/24/07 259 2 2592007002 43381 OPERATE MAN SYSTEM.
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be r um n tN tio ep cr ip or n /D tR atio es E DA Even ifi se NA TE c OD Ca M DO CK ns tN E u PL EN ET ee ot M AM NO AN T RE Ev UN Sc T EV GI ON Lic en IT SC ram TE S
e R THE REACTOR TRIPPED FOLLOWING A TURBINE TRIP. THE TURBINE TRIPPED DUE TO HIGH LEVEL IN A MOISTURE SEPARATOR DRAIN TANK. THE ROOT CAUSE IS THE SIZING OF THE MOISTURE SEPARATOR BROWNS FERRY 1 06/09/07 259 2 2592007005 43414 OPERATE AUTO LEVEL CONTROL DUMP VALVE.
THE REACTOR SCRAMMED DUE TO AN APRM TRIP SIGNAL. THE CAUSE WAS THE RECIRCULATION SYSTEM FLOW TRANSMITTER SENSING LINE BECOMING SEPARATED, GIVING A LOW FLOW SIGNAL BROWNS FERRY 1 08/11/07 259 2 2592007007 43560 OPERATE AUTO TO THE NEUTRON MONITORING SYSTEM.
A REACTOR TRIP WAS MANUALLY INITIATED DUE TO AN INCREASING LEAK IN THE TURBINE GENERATOR'S ELECTRO-HYDRAULIC CONTROL SYSTEM. THE CAUSE WAS A THROUGH WALL LEAK DUE TO FRETTING BROWNS FERRY 1 09/03/07 259 2 2592007008 43613 OPERATE MAN OF THE EHC TUBING AGAINST A STEEL SUPPORT MEMBER.
AN AUTOMATIC REACTOR SCRAM OCCURRED FOLLOWING A TURBINE TRIP. THE CAUSE OF THE TURBINE TRIP WAS A FALSE HIGH BROWNS FERRY 1 10/12/07 259 2 2592007009 43718 OPERATE AUTO MOISTURE SEPARATOR LEVEL SIGNAL.
DURING RPS BUS TRANSFER FOR MAINTENANCE, THE MSIVS CLOSED, RESULTING IN A REACTOR SCRAM. THE CAUSE OF THE MSIV CLOSURE BROWNS FERRY 2 06/09/10 260 2 2602010003 45990 OPERATE AUTO WAS INDETERMINATE.
THE REACTOR WAS MANUALLY TRIPPED DUE TO LOSS OF STATOR WATER COOLING TO THE MAIN GENERATOR. THE CAUSE OF THE LOSS OF STATOR WATER COOLING WAS THE SINGLE-POINT FAILURE OF BROWNS FERRY 2 02/16/09 260 2 2602009001 44854 OPERATE MAN THE TEMPERATURE CONTROL VALVE.
THE REACTOR WAS MANUALLY TRIPPED DUE RAPIDLY LOWERING REACTOR VESSEL LEVEL CAUSED BY LOSS OF ONE OF THE TWO AVAILABLE CONDENSATE BOOSTER PUMPS. WITH ONE PUMP UNAVAILABLE FOR MAINTENANCE, A SECOND PUMP TRIPPED WHILE BROWNS FERRY 2 09/29/09 260 2 2602009007 45391 OPERATE MAN REMOVING A FEEDWATER PUMP FROM SERVICE.
THE REACTOR TRIPPED FOLLOWING A TURBINE-GENERATOR LOAD REJECTION SIGNAL. THE CAUSE OF THE LOAD REJECTION SIGNAL WAS BROWNS FERRY 2 10/04/08 260 2 2602008001 44540 OPERATE AUTO A FAILED RELAY IN THE TURBINE GENERATOR VOLTAGE REGULATOR.
THE REACTOR SCRAMMED DUE TO A TURBINE TRIP. THE TURBINE TRIPPED DUE TO THE MAIN 500KV OUTPUT BREAKER OPENING. THE CAUSE OF THE GENERATOR LOAD REJECTION WAS A FAILED RELAY IN BROWNS FERRY 2 01/11/07 260 2 2602007001 43092 OPERATE AUTO THE MAIN GENERATOR VOLTAGE REGULATOR.
A SCRAM OCCURRED ON LOW RX WATER LEVEL FOLLOWING THE LOSS OF THE "2C" AND "2B" RX FEED PUMPS. THE CAUSE WAS DISCONNECTED CONTROL VALVE LINKAGE FOR ONE PUMP AND A BROWNS FERRY 2 08/05/05 260 2 2602005007 41896 OPERATE AUTO THRUST BEARING WEAR DETECTOR TRIP ON THE OTHER PUMP.
A RX SCRAM OCCURRED ON A SPURIOUS TURBINE GENERATOR LOAD REJECT SIGNAL. THE CAUSE WAS AN INADEQUATE PROCEDURE GOVERNING TRANSFER OF A 120 VAC UPS BUS AND A CONTRIBUTING FACTOR WAS AN INADEQUATE EHC SYSTEM SOFTWARE BROWNS FERRY 2 07/08/04 260 2 2602004001 40858 OPERATE AUTO CONFIGURATION.
A SCRAM OCCURRED ON A SPURIOUS UPSCALE TRIP ON THE INTERMEDIATE RANGE MONITORS. THE CAUSE WAS ELECTRICAL BROWNS FERRY 2 07/10/04 260 2 2602004002 STARTUP AUTO NOISE GENERATED BY MOVEMENT OF IRM "C".
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be r um n tN tio ep cr ip or n /D tR atio es E DA Even ifi se NA TE c OD Ca M DO CK ns tN E u PL EN ET ee ot M AM NO AN T RE Ev UN Sc T EV GI ON Lic en IT SC ram TE S
e R THE RX WAS MANUALLY SCRAMMED FOLLOWING A TRIP OF THE '2B' RX RECIRCULATION PUMP, THE "2A" RX RECIRCULATION PUMP HAD TRIPPED EARLIER IN THE SHIFT. THE CAUSE WAS SPIKING IN THE NEUTRAL VOLTAGE SIGNALS IN THE VARIABLE FREQUENCY DRIVES BROWNS FERRY 2 03/26/03 260 2 2602003003 39702 OPERATE MAN FOR UNKNOWN REASONS.
A TURBINE TRIP/RX SCRAM OCCURRED ON A MAIN GENERATOR TRIP RESULTING FROM A GROUND FAULT ON A MAIN BANK TRANSFORMER BUSHING. THE CAUSE WAS THERMAL DEGRADATION OF THE PAPER INSULATION OF THE BUSHING'S INTERNAL BROWNS FERRY 2 07/27/02 260 2 2602002002 39100 OPERATE AUTO CONDENSER.
A TURBINE/RX TRIP OCCURRED ON AN ERRONEOUS POWER-LOAD UNBALANCE SIGNAL DURING COMBINED INTERMEDIATE VALVE TESTING. THE SIGNAL RESULTED FROM AN ERROR IN THE EHC BROWNS FERRY 2 07/25/01 260 2 2602001003 38171 OPERATE AUTO CONTROLLER SOFTWARE.
THE REACTOR WAS MANUALLY TRIPPED DUE TO HIGH VIBRATIONS ON THE GENERATOR EXCITER INBOARD AND OUTBOARD JOURNAL BROWNS FERRY 3 12/26/10 296 2 2962010004 46511 OPERATE MAN BEARINGS.
THE REACTOR WAS MANUALLY TRIPPED FOLLOWING THE LOSS OF 2 OF THE 3 CONDENSATE BOOSTER PUMPS. THE PUMPS TRIPPED ON LOW SUCTION PRESSURE. THE CAUSE OF THE LOW CONDENSATE SUCTION PRESSURE WAS FAILURE OF THE CONDENSATE BROWNS FERRY 3 08/24/09 296 2 2962009001 45290 OPERATE MAN DEMINERALIZERS LOGIC CONTROL.
LOWERING CONDENSATE FLOW RESULTED IN LOWERING FEEDWATER FLOW, CAUSING THE REACTOR TO SCRAM ON LOW REACTOR WATER LEVEL. THE CAUSE OF THE LOWERING CONDENSATE FLOW WAS LOSS OF THE CONDENSATE BROWNS FERRY 3 02/09/07 296 2 2962007001 43159 OPERATE AUTO DEMINERALIZER DUE TO PERSONNEL ERROR.
THE REACTOR TRIPPED FOLLOWING A MAIN GENERATOR LOAD REJECTION. THE CAUSE OF THE LOAD REJECTION WAS A SPURIOUS BROWNS FERRY 3 12/31/07 296 2 2962007005 43878 OPERATE AUTO OPERATION OF THE GENERATOR PHASE DISCORDANCE RELAY.
THE REACTOR WAS MANUALLY SCRAMMED FOLLOWING THE TRIP OF BOTH REACTOR RECIRCULATION PUMPS. THE CAUSE OF THE PUMPS TRIPPING WAS A MALFUNCTION OF THE VARIABLE FREQUENCY BROWNS FERRY 3 08/19/06 296 2 2962006002 42787 OPERATE MAN DRIVE MICROPROCESSORS.
THE REACTOR WAS MANUALLY TRIPPED AT 78% POWER DUE TO AN OIL LEAK IN THE #2 MAIN TURBINE CONTROL VALVE HYDRAULIC BROWNS FERRY 3 08/29/06 296 2 2962006003 42813 OPERATE MAN SYSTEM.
A RX SCRAM OCCURRED ON LOAD REJECT WHEN THE OUTPUT BREAKER TRIPPED DURING A RESTORATION FROM SWITCHYARD MAINTENANCE. A SWITCHYARD DISCONNECT DEVICE WAS INSERTED OUT OF SEQUENCE FROM THE INSTRUCTIONS GIVEN IN A SWITCHING BROWNS FERRY 3 02/11/05 296 2 2962005001 41404 OPERATE AUTO ORDER.
A TURBINE TRIP/RX SCRAM OCCURRED ON LOW MAIN CONDENSER VACUUM DURING A MAINTENANCE ACTIVITY TO REPAIR IN PLACE A SECONDARY PLANT HIGH PRESSURE FEEDWATER HEATER LEVEL CONTROL VALVE. AN AIR INLEAKAGE PATH WAS CREATED DURING BROWNS FERRY 3 09/17/05 296 2 2962005002 41997 OPERATE AUTO THE MAINTENANCE ACTIVITY.
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be r um n tN tio ep cr ip or n /D tR atio es E DA Even ifi se NA TE c OD Ca M DO CK ns tN E u PL EN ET ee ot M AM NO AN T RE Ev UN Sc T EV GI ON Lic en IT SC ram TE S
e R A TURBINE/RX TRIP OCCURRED DURING AN ELECTRICAL DISTURBANCE WHEN A SWITCHYARD BREAKER WAS CLOSED ONTO A GROUNDED TRANSMISSION LINE. THE CAUSE WAS FAILURE TO ENSURE THE GROUNDING SWITCHES ON THE TRANSMISSION LINE BROWNS FERRY 3 10/31/05 296 2 2962005003 42102 OPERATE AUTO WERE OPENED PRIOR TO THE ACTIVITY.
A TURBINE TRIP/RX SCRAM OCCURRED AS THE RESULT OF A GRID BROWNS FERRY 3 11/23/04 296 2 2962004002 41219 OPERATE AUTO DISTURBANCE CAUSED BY A LIGHTNING STRIKE.
A RX SCRAM OCCURRED ON LOW RX VESSEL WATER LEVEL FOLLOWING A MARKED SPEED REDUCTION OF A RX FEED PUMP. THE CAUSE WAS A CLOGGED FEED PUMP CONTROL OIL FILTER. AFTER RECEIVING A HIGH DP ALARM, OPERATORS DELAYED SWAPPING THE BROWNS FERRY 3 04/15/00 296 2 2962000001 36892 OPERATE AUTO FILTER WITH A CLEAN ONE.
A RX SCRAM OCCURRED ON AN INVALID LOW RX WATER LEVEL SIGNAL GENERATED WHILE RETURNING A FEEDWATER LEVEL TRANSMITTER TO SERVICE. THE CAUSE WAS A LACK OF SPECIFIC PROCEDURALIZED VALVING SEQUENCES FOR THE LEVEL BROWNS FERRY 3 05/24/00 296 2 2962000005 37027 OPERATE AUTO TRANSMITTER.
THE REACTOR TRIPPED FOLLOWING A TURBINE GENERATOR TRIP.
THE TURBINE TRIPPED DUE TO LOSS OF CONDENSER VACUUM CAUSED BY THE LOSS OF THE ELECTRICAL BUS SUPPLYING THE CIRC WATER PUMPS. THE BUS WAS LOST WHEN WATER OVERFLOWED BRAIDWOOD 1 08/16/10 456 3 4562010001 46178 OPERATE AUTO FROM THE AFW STANDPIPES.
THE REACTOR TRIPPED FOLLOWING A TURBINE TRIP. THE TURBINE TRIP WAS CAUSED WHEN TESTING A S/G WATER LEVEL CHANNEL.
ONE CHANNEL OF THE SSPS LOGIC WAS FAILED, AND WHEN THE BRAIDWOOD 1 09/20/10 456 3 4562010004 46262 OPERATE AUTO OTHER CHANNEL WAS PLACED IN TEST, A TURBINE TRIP OCCURRED.
A REACTOR COOLANT PUMP BREAKER TRIPPED DURING A THUNDERSTORM DUE TO A GRID DISTURBANCE ON A 345 KV TRANSMISSION LINE. THIS RESULTED IN A REACTOR COOLANT PUMP BRAIDWOOD 1 06/27/07 456 3 4562007001 43449 OPERATE AUTO TRIP AND SUBSEQUENT REACTOR TRIP.
THE REACTOR TRIPPED FOLLOWING A TRIP OF THE TURBINE GENERATOR. THE TURBINE GENERATOR TRIPPED DUE TO A GENERATOR LOCKOUT RELAY ACTUATION. THE LOCKOUT RELAY ACTUATION WAS CAUSED BY A PHASE-TO-GROUND FAULT IN THE BRAIDWOOD 2 08/16/10 457 3 4572010003 46178 OPERATE AUTO ISOLATED PHASE (ISOPHASE) BUS DUCT.
THE REACTOR TRIPPED WHILE PERFORMING REACTOR TRIP INSTRUMENTATION CALIBRATION. WITH THE "B" TRAIN OF PZR PRESSURE IN TEST, A SPIKE OCCURRED ON THE "D" TRAIN OF RCS SCRAMMED ON HIGH TEMPERATURE DELTA BRAIDWOOD 2 04/24/09 457 3 4572009001 45017 OPERATE AUTO HIGH-TEMPERATURE-DELTA-TEMPERATURE, RESULTING IN A SCRAM. TEMPERATURE SIGNAL SPIKE.
A FAULT ON THE SAT SUDDEN PRESSURE RELAY TRIPPED THE TRANSFORMER. A SLOW AUTOMATIC BUS TRANSFER RESULTED IN A REACTOR COOLANT PUMP TRIPPING ON OVER CURRENT. THIS BRAIDWOOD 2 07/30/09 457 3 4572009002 45238 OPERATE AUTO RESULTED IN A REACTOR TRIP.
THE REACTOR TRIPPED FOLLOWING A TURBINE TRIP. THE TURBINE TRIP WAS CAUSED BY ACTUATION OF THE UNIT AUXILIARY TRANSFORMER'S SUDDEN PRESSURE RELAY. THE DIRECT CAUSE WAS BRAIDWOOD 2 12/27/08 457 3 4572008002 44743 OPERATE AUTO A PHASE-TO-PHASE MOTOR FAULT ON A HEATER DRAIN PUMP.
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be r um n tN tio ep cr ip or n /D tR atio es E DA Even ifi se NA TE c OD Ca M DO CK ns tN E u PL EN ET ee ot M AM NO AN T RE Ev UN Sc T EV GI ON Lic en IT SC ram TE S
e R THE REACTOR WAS MANUALLY TRIPPED DUE TO LOWERING CONDENSER VACUUM FOLLOWING THE TRIP OF TWO CIRC WATER PUMPS. THE CAUSE OF THE CIRC WATER PUMP TRIPS WAS A FALSE HIGH DIFFERENTIAL LEVEL INDICATION ACROSS THE TRAVELING BRAIDWOOD 2 08/23/07 457 3 4572007001 43590 OPERATE MAN SCREENS.
A TURBINE/RX TRIP OCCURRED DUE TO GENERATOR PROTECTIVE CIRCUITRY. THE CAUSE WAS A FAILED MAIN GENERATOR "C" PHASE BUSHING RESULTING FROM AN INADEQUATE REDESIGN OF THE BRAIDWOOD 2 03/28/05 457 3 4572005002 41535 OPERATE AUTO BUSHING IN THE 2000 TIME PERIOD.
A RX TRIP OCCURRED ON LOW SG WATER LEVEL FOLLOWING THE FAILURE OF A STEAM FLOW ISOLATION CARD IN THE SG WATER BRAIDWOOD 2 12/22/04 457 3 4572004002 41280 OPERATE AUTO LEVEL CONTROL SYSTEM.
A RX TRIP OCCURRED ON LOW SG LEVEL DURING WEEKLY FEEDWATER SURVEILLANCE OF THE HP STOP VALVE. THE CAUSE WAS A CASCADING LOSS OF THE "2C" AND "2B" FEEDWATER PUMPS BRAIDWOOD 2 12/03/03 457 3 4572003004 40370 OPERATE AUTO CAUSED BY A LACK OF PREVENTIVE MAINTENANCE.
A RX TRIP OCCURRED ON LOW RX COOLANT FLOW WHEN A RCP LOST POWER DURING AN ELECTRICAL PLANT MANIPULATION. PERSONNEL OPENED THE WRONG POTENTIAL TRANSFORMER FUSE DOOR, BRAIDWOOD 2 05/19/01 457 3 4572001001 38012 OPERATE AUTO DEENERGIZING THE RCP'S 6.9 KV BUS.
A RX TRIP OCCURRED ON HIGH NEGATIVE FLUX RATE FOLLOWING A DROPPED ROD. A CONTROL BANK STATIONARY GRIPPER FUSE WAS BRAIDWOOD 2 04/15/00 457 3 4572000002 36893 OPERATE AUTO FOUND BLOWN, WHICH WAS BELIEVED TO BE AN ISOLATED FAILURE.
AN AUTOMATIC REACTOR TRIP OCCURRED FOLLOWING THE SPURIOUS OPENING OF THE B REACTOR TRIP BREAKER. THE REACTOR TRIP BREAKER OPENED DUE TO FAILURE OF THE UNIVERSAL LOGIC CARD OUTPUT GATE IN THE SOLID STATE PROTECTION BEAVER VALLEY 1 09/07/06 334 1 3342006004 42834 OPERATE AUTO SYSTEM.
A RX TRIP OCCURRED ON LOW STEAM LINE PRESSURE. THE CAUSE WAS CLOSURE OF THE "C" MSIV WHEN ITS WEST CYLINDER RUPTURE DISK WAS DAMAGED BY HUMAN ERROR DURING A MAINTENANCE BEAVER VALLEY 1 02/24/03 334 1 3342003001 39616 OPERATE AUTO ACTIVITY AND FAILED.
A TURBINE/RX TRIP OCCURRED WHEN TECHNICIANS CONNECTED A DIGITAL VOLT METER ACROSS THE INCORRECT TERMINALS DURING BEAVER VALLEY 1 11/13/03 334 1 3342003007 40320 OPERATE AUTO TESTING IN THE RX TRIP BREAKER SWITCHGEAR CABINET.
THE RX WAS MANUALLY TRIPPED DUE TO A TURBINE MOTORING BEAVER VALLEY 1 11/11/02 334 1 39363 OPERATE MAN CONDITION ALARM. THE LICENSEE IS INVESTIGATING THE CAUSE.
THE RX WAS MANUALLY TRIPPED WHEN DEGRADED INSTRUMENT AIR PRESSURE RESULTED IN THE LOSS OF COOLING WATER TO THE REACTOR COOLANT PUMPS. THE CAUSE WAS AGING/CYCLIC FATIGUE BEAVER VALLEY 1 06/22/01 334 1 3342001001 38086 OPERATE MAN FAILURE OF AN INSTRUMENT AIR SYSTEM BLOWDOWN VALVE.
A RX TRIP OCCURRED ON LOW SG WATER LEVEL AFTER A FEEDWATER CONTROL VALVE FAILED CLOSED. THE CAUSE WAS A FAILED DIODE IN BEAVER VALLEY 1 11/06/01 334 1 3342001003 38472 OPERATE AUTO THE PROCESS RACK MODULE THAT CONTROLS THE VALVE ACTUATOR.
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e R THE RX WAS MANUALLY TRIPPED ON DECREASING STATION INSTRUMENT AIR PRESSURE. ONE COMPRESSOR WAS OUT OF SERVICE FOR MAINTENANCE WHEN THE OTHER COMPRESSOR TRIPPED DUE TO A BLOWN CONTROL CIRCUIT FUSE. THE CAUSE WAS BEAVER VALLEY 1 12/07/01 334 1 3342001004 38548 OPERATE MAN A FAILURE OF THE STATION WORK PROCESS.
THE RX WAS MANUALLY TRIPPED DUE TO DEGRADING CONDENSER VACUUM. THE CAUSE WAS INADEQUATE STEAM SUPPLY TO THE AIR EJECTORS DUE TO A MALFUNCTIONING AUXILIARY STEAM PRESSURE BEAVER VALLEY 1 04/17/00 334 1 3342000005 36901 OPERATE MAN CONTROL VALVE.
A TURBINE TRIP/RX TRIP OCCURRED FOLLOWING A MOMENTARY LOSS OF DC CONTROL POWER TO THE ANALOG ELECTROHYDRAULIC (AEH) CONTROL SYSTEM ASSOCIATED WITH THE MAIN TURBINE. THE CAUSE WAS A FAULT IN THE AEH CONTROL CABINET BUT THE BEAVER VALLEY 1 07/05/00 334 1 3342000006 37145 OPERATE AUTO SPECIFIC CAUSE IS UNKNOWN.
DURING STARTUP, A LEAK WAS DISCOVERED ON AN AFW CONTAINMENT PENETRATION LINE. A SHUTDOWN WAS COMMENCED. THE REACTOR WAS MANUALLY TRIPPED WHEN STEAM GENERATOR 21A LEVEL DROPPED TO THE MANUAL TRIP CRITERIA OF BEAVER VALLEY 2 04/10/11 412 1 46744 OPERATE MAN 25%.
A RX TRIP OCCURRED ON A GENERATOR TRIP. THIS WAS CAUSED BY IMPROPER ASSEMBLY OF THE GENERATOR FIELD POLE SUPPORT BEAVER VALLEY 2 04/02/06 412 1 4122006001 42467 OPERATE AUTO BLOCKS.
A RX TRIP OCCURRED ON LOW SG WATER LEVEL WHILE DECREASING POWER FOR HEATER DRAIN PUMP REPAIRS. THE "B" MAIN FEEDWATER REGULATING VALVE DID NOT RESPOND PROPERLY. THE CAUSE WAS A FAILED CARD IN THE FEEDWATER SG WATER LEVEL BEAVER VALLEY 2 10/14/03 412 1 4122003003 40247 OPERATE AUTO CONTROL SYSTEM.
A RX TRIP OCCURRED ON DECREASING SG WATER LEVELS FOLLOWING A CONDENSATE PUMP TRIP AND SUBSEQUENT FEEDWATER PUMP TRIP. THE CAUSE WAS A FAILED ELECTRICAL JOINT BEAVER VALLEY 2 03/17/01 412 1 4122001001 37845 OPERATE AUTO ON ONE PHASE OF THE CONDENSATE PUMP POWER LEAD.
A RX TRIP OCCURRED ON OVERTEMPERATURE DELTA-TEMPERATURE WHEN THE TURBINE GOVERNOR VALVES FAILED CLOSED. THE CAUSE WAS AN INTERMITTENTLY FAILED DEHC CARD AND COULD NOT BE FEEDWATER ISOLATED AND AFW WAS MANUALLY BYRON 1 10/15/02 454 3 4542002003 39286 OPERATE AUTO DIAGNOSED. THIS IS THE FIRST OF TWO EVENTS. STARTED.
A RX TRIP OCCURRED ON OVERTEMPERATURE DELTA-TEMPERATURE WHEN THE TURBINE GOVERNOR VALVES FAILED CLOSED. THE CAUSE WAS A FAILED DEHC SYSTEM CARD. THIS IS THE SECOND OF TWO BYRON 1 11/07/02 454 3 4542002003 39353 OPERATE AUTO SIMILAR EVENTS.
A RX TRIP OCCURRED ON LOW SG WATER LEVEL AFTER THE CONDENSATE/CONDENSATE BOOSTER PUMP TRIPPED ON OVER BYRON 2 10/19/05 455 3 4552005001 42063 OPERATE AUTO CURRENT. THE CAUSE WAS A STATOR WINDING FAILURE.
THE RX WAS MANUALLY TRIPPED DUE TO DECREASING SG WATER LEVEL AFTER A FEEDWATER REGULATING VALVE FAILED. THE CAUSE WAS AN INCORRECTLY INSTALLED RETAINING CLIP IN THE VALVE BYRON 2 06/26/01 455 3 4552001002 38094 OPERATE MAN POSITIONER.
A TURBINE TRIP/RX TRIP OCCURRED FOLLOWING AN OFFSITE POWER LINE FAULT. A FAILED CIRCUIT BREAKER LOAD REJECTION CONTACT BYRON 2 01/13/00 455 3 4552000001 36585 OPERATE AUTO PREVENTED THE FAULT FROM BEING ISOLATED IN THE SWITCHYARD.
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e R A RX TRIP OCCURRED ON LOW SG WATER LEVEL. A CIRCUIT CARD FAILURE IN THE MAIN FEEDWATER REGULATING VALVE CIRCUITRY AND INAPPROPRIATE OPERATOR RESPONSE CAUSED THE VALVE TO BYRON 2 07/26/00 455 3 4552000002 37187 OPERATE AUTO CLOSE.
THE REACTOR WAS MANUALLY TRIPPED FOLLOWING A MAIN FEED CALLAWAY 11/11/08 483 4 4832008005 44652 OPERATE MAN PUMP TRIP. THE FEED PUMP TRIPPED ON LOW LUBE OIL PRESSURE.
A FEEDWATER TRANSIENT CAUSED BY A CONDENSATE PUMP TRIP RESULTED IN THE REACTOR TRIPPING ON HIGH STEAM GENERATOR LEVEL. THE CONDENSATE PUMP TRIPPED DUE TO AN ELECTRICAL CALLAWAY 12/11/08 483 4 4832008006 44714 OPERATE AUTO GROUND FAULT.
THE REACTOR WAS MANUALLY TRIPPED WHEN A CONDENSATE PUMP DEVELOPED A MOTOR GROUND FAULT. THE THIRD CALLAWAY 12/14/08 483 4 4832008008 44719 OPERATE MAN CONDENSATE PUMP WAS NOT AVAILABLE AT THE TIME.
WHILE REDUCING POWER FROM 100% DUE TO A CONDENSER TUBE LEAK, THE REACTOR WAS TRIPPED AT 30% POWER DUE TO INADEQUATE FEEDWATER CONTROL. LEVEL WAS INCREASING WITH BOTH THE MFRV AND THE BYPASS VALVE CLOSED. AN I/P POSITIONER CALLAWAY 03/09/07 483 4 4832007002 43227 OPERATE MAN ON THE MFRV HAD FAILED.
THE RX WAS MANUALLY TRIPPED ON HIGH SG WATER LEVEL CALLAWAY 05/12/06 483 4 4832006004 42571 OPERATE MAN FOLLOWING A MANUAL TURBINE TRIP FOR HIGH VIBRATION.
A RX TRIP OCCURRED ON LOW SG WATER LEVEL FOLLOWING A MOMENTARY LOSS OF POWER IN A CONTROL CABINET RELAY PANEL DURING A POWER SUPPLY REPLACEMENT ACTIVITY. THE CAUSE WAS INADEQUATE WORK INSTRUCTIONS FOR THE REPLACEMENT CALLAWAY 01/19/05 483 4 4832005001 41347 OPERATE AUTO ACTIVITY.
A RX TRIP OCCURRED AS A RESULT OF A FAILED ELECTRICAL RELAY IN CALLAWAY 01/27/04 483 4 4832004002 40484 OPERATE AUTO THE MAIN GENERATOR PROTECTION CIRCUITRY.
A RX TRIP OCCURRED WHEN THE MAIN GENERATOR OUTPUT BREAKERS OPENED DURING SWITCHYARD MAINTENANCE. THE CAUSE WAS A FAULTED TIMER RELAY IN THE GENERATOR CALLAWAY 02/03/04 483 4 4832004003 40500 OPERATE AUTO PROTECTION CIRCUITRY.
A RX TRIP OCCURRED ON LOW SG WATER LEVEL DURING A FEEDWATER TRANSIENT AFTER A TRANSFER FROM THE BYPASS FEEDWATER REGULATING VALVES TO THE MAIN FEEDWATER REGULATING VALVES. THE CAUSE WAS INSUFFICIENT FEEDWATER CALLAWAY 02/15/04 483 4 4832004005 40522 OPERATE AUTO PREHEATING.
A RX TRIP OCCURRED ON OTDT THAT WAS GENERATED DURING A DOWN POWER AT ONE PERCENT PER MINUTE TO SECURE THE "C" CONDENSATE PUMP DUE TO AN OIL LEAK. THE ACCUMULATION OF OTDT PENALTY POINTS CULMINATED IN A ROD STOP,TURBINE CALLAWAY 12/14/02 483 4 4832002014 39445 OPERATE AUTO RUNBACK, AND SUBSEQUENT RX TRIP.
A RX TRIP FOLLOWED A LOSS OF POWER TO THE ROD CONTROL SYSTEM. A ROD DRIVE MG SET OUTPUT BKR OPENED AFTER THE OTHER TRAIN'S BKR WAS OPENED FOR MAINTENANCE. ALL RODS INSERTED RESULTING IN AN OTDT RX TRIP. THE CAUSE WAS A 40 CALLAWAY 03/09/01 483 4 4832001003 37821 OPERATE AUTO VOLT RIPPLE IN A DC BUS.
A RX TRIP OCCURRED ON LOW RCS FLOW FOLLOWING THE TRIP OF A RCP. SHORTLY AFTER THE TRIP, THE THREE REMAINING RCPS AND ALL MAIN CIRCULATING WATER PUMPS TRIPPED. THE CAUSE WAS CALLAWAY 02/13/00 483 4 4832000002 36685 OPERATE AUTO FLUCTUATING GRID VOLTAGE. NO CHANGES.
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be r um n tN tio ep cr ip or n /D tR atio es E DA Even ifi se NA TE c OD Ca M DO CK ns tN E u PL EN ET ee ot M AM NO AN T RE Ev UN Sc T EV GI ON Lic en IT SC ram TE S
e R THE REACTOR TRIPPED DUE TO THE LOSS OF AN RCP FOLLOWING A PARTIAL LOSS OF OFFSITE POWER. THE RCP WAS LOST DUE TO AN ELECTRICAL MALFUNCTION. THE FAULT WAS CAUSED BY A SHORT DUE TO WATER INTRUSION INTO THE RELAY PROTECTION CIRCUITRY CALVERT CLIFFS 1 02/18/10 317 1 3172010001 45709 OPERATE AUTO CUBICLE.
THE REACTOR TRIPPED ON HIGH PRESSURIZER PRESSURE FOLLOWING A LOAD REJECTION. THE LOAD REJECTION WAS CAUSED BY A GENERATOR OUTPUT BREAKER OPENING WHILE THE REDUNDANT BREAKER WAS OPEN FOR MAINTENANCE. THE BREAKER OPENED DUE CALVERT CLIFFS 1 05/12/10 317 1 3172010003 45920 OPERATE AUTO TO A LOOSE 125VDC CONNECTION.
DURING MAINTENANCE ON THE TURBINE CONTROL SYSTEM, A TRANSIENT WAS CAUSED IN THE REACTOR COOLANT SYSTEM RESULTING IN A MANUAL REACTOR TRIP. THE CAUSE OF THE TRANSIENT WAS A BROKEN WIRE IN THE ELECTRICAL CABINET OF CALVERT CLIFFS 1 12/12/06 317 1 3172006004 43046 OPERATE MAN TURBINE CONTROL VALVE 3.
THE RX WAS MANUALLY SCRAMMED ON HIGH TURBINE GENERATOR VIBRATION. THE CAUSE WAS RUBBING RESULTING FROM TIGHT CALVERT CLIFFS 1 03/01/05 317 1 3172005002 41452 OPERATE MAN PACKING TO ROTOR CLEARANCES.
A RX TRIP OCCURRED ON LOW SG WATER LEVEL AFTER A FRV CLOSURE AND RESULTING LOSS OF BOTH FEED PUMPS. THE CAUSE WAS A SHORTED CHART RECORDER POWER FEED DURING MAINTENANCE WHICH RESULTED IN THE LOSS OF A DIGITAL CALVERT CLIFFS 1 03/20/04 317 1 3172004001 40601 OPERATE AUTO FEEDWATER TRANSFER BUS.
THE RX WAS MANUALLY TRIPPED ON DECREASING OIL LEVEL AND INCREASING THRUST BEARING TEMPERATURE ON ONE OF FOUR RX COOLANT PUMPS. THE CAUSE WAS A FAILED BUTT WELD ON A RX CALVERT CLIFFS 1 07/24/02 317 1 3172002003 39088 OPERATE MAN COOLANT PUMP MOTOR OIL COOLER LINE.
A TURBINE TRIP/RX TRIP OCCURRED ON A RX TRIP BUS UNDERVOLTAGE CONDITION. THE CAUSE WAS A FAILURE OF A MG CALVERT CLIFFS 1 01/14/00 317 1 3172000001 36591 OPERATE AUTO SET LOCAL VOLTAGE ADJUST HAND SWITCH.
A RX TRIP OCCURRED ON LOW SG WATER LEVEL FOLLOWING THE SPURIOUS CLOSURE OF BOTH MSIVS. THE CAUSE WAS A FAILED LOGIC MODULE IN THE ENGINEERED SAFETY FEATURES ACTUATION CALVERT CLIFFS 1 09/10/00 317 1 3172000005 37303 OPERATE AUTO SYSTEM.
THE REACTOR TRIPPED ON LOW FLOW FOLLOWING A PARTIAL LOSS OF POWER TO THE RCP BUS. THE LOSS OF AN RCP WAS CAUSED BY AN ELECTRICAL MALFUNCTION DUE TO FAILURE OF A GROUND CALVERT CLIFFS 2 02/18/10 318 1 3182010001 45709 OPERATE AUTO FAULT RELAY.
WHILE PERFORMING A CLEARANCE ORDER FOR MAINTENANCE ON TRANSFORMER P-13000-2, A REACTOR TRIP OCCURRED DUE TO HIGH PRESSURE. PERSONNEL INVOLVED IN THE EVOLUTION WERE UNAWARE THAT OPENING THE DISCONNECT WOULD RESULT IN A CALVERT CLIFFS 2 11/16/06 318 1 3182006001 42995 OPERATE AUTO REACTOR TRIP.
A RX TRIP OCCURRED ON LOW SG WATER LEVEL FOLLOWING THE TRIP OF A SG FEED PUMP ON AN ERRONEOUS OVER SPEED TRIP SIGNAL. THE CAUSE WAS DEGRADED DIGITAL SPEED MONITOR SUPPLY VOLTAGE RESULTING FROM CORROSION OF AN INLINE FUSE CALVERT CLIFFS 2 01/23/04 318 1 3182004001 40472 OPERATE AUTO AND HOLDER CONTACTS.
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e R A TURBINE/RX TRIP OCCURRED ON HIGH PZR PRESSURE RESULTING WHEN THE MAIN TURBINE GOVERNOR VALVES SHUT UNEXPECTEDLY DURING TROUBLESHOOTING ON THE MAIN TURBINE CONTROLS. A SHORT CIRCUIT WAS CAUSED BY INCORRECT USE OF TEST CALVERT CLIFFS 2 05/28/03 318 1 3182003003 39885 OPERATE AUTO EQUIPMENT DURING TROUBLESHOOTING.
A RX TRIP OCCURRED ON A LOSS OF OFFSITE POWER. THE EVENT WAS CAUSED BY FAILURE TO IMPLEMENT RELAY TAP SETTING CATAWBA 1 05/20/06 413 2 4132006001 42592 OPERATE AUTO CHANGES IN SWITCHYARD EQUIPMENT.
THE RX WAS MANUALLY TRIPPED AFTER A SG FEEDWATER ISOLATION VALVE FAILED CLOSED. THE CAUSE WAS FAILURE OF THE VALVES HYDRAULIC ACTUATER WHEN A PLUG IN THE BOTTOM OF THE CATAWBA 1 02/22/04 413 2 4132004002 40538 OPERATE MAN HYDRAULIC RESERVOIR EJECTED.
A TURBINE/RX TRIP OCCURRED ON MOISTURE SEPARATOR REHEATER INVALID HIGH LEVEL. THE MICRO-SWITCH MECHANISMS ON THE TWO LEVEL SWITCHES WERE OUT OF ADJUSTMENT CONCURRENT CATAWBA 1 12/05/04 413 2 4132004004 41246 OPERATE AUTO WITH EXTERNAL VIBRATION TO THE SWITCHES.
A TURBINE/RX TRIP OCCURRED ON HIGH SG WATER LEVEL AFTER THE FEEDWATER CONTROL SYSTEM WENT TO MANUAL DURING A FEEDWATER TRANSMITTER REPLACEMENT ACTIVITY. THE CAUSE WAS INADEQUATE UNDERSTANDING OF THE MAIN FEEDWATER CONTROL CATAWBA 1 02/04/03 413 2 4132003001 39559 OPERATE AUTO SYSTEM.
A RX TRIP OCCURRED ON OTDT PROTECTION WHEN CHANNEL TWO PZR PRESSURE FAILED LOW WHILE CHANNEL ONE OTDT WAS IN TRIP DUE TO A RX COOLANT HOT LEG TEMPERATURE PROBLEM. THE CATAWBA 1 08/29/03 413 2 4132003005 40114 OPERATE AUTO CAUSE WAS A FAILED PZR PRESSURE LOOP POWER SUPPLY CARD.
A TURBINE TRIP/RX TRIP OCCURRED WHILE INVESTIGATING A PROBLEM WITH THE MECHANICAL TRIP SOLENOID VALVE.
TROUBLESHOOTING FAILED TO NOTE THAT THE MECHANICAL TRIP PISTON WAS NOT FULLY RESET DURING LIMIT SWITCH REPLACEMENT CATAWBA 1 01/17/01 413 2 4132001001 37667 OPERATE AUTO AND CALIBRATION.
A RX TRIP OCCURRED FOLLOWING A TURBINE TRIP DUE TO AN ELECTRICAL SHORT ON THE TURBINE ELECTRICAL TRIP SOLENOID VALVE. THE CAUSE WAS THE MISAPPLICATION OF A CONNECTOR CATAWBA 1 02/13/00 413 2 4132000001 36686 OPERATE AUTO INSERT INSULATING MATERIAL.
A REACTOR TRIP OCCURRED ON LOSS OF OFFSITE POWER. THE EVENT WAS CAUSED BY FAILURE TO IMPLEMENT RELAY TAP SETTING CATAWBA 2 05/20/06 414 2 4132006001 42592 OPERATE AUTO CHANGES IN SWITCHYARD EQUIPMENT.
THE RX WAS MANUALLY TRIPPED AFTER AN ELECTRICAL FAULT CAUSED SHUTDOWN BANK "D" RODS TO DROP INTO THE CORE. THE MOST PROBABLE CAUSE WAS AN INTERMITTENT FAILURE OF A CATAWBA 2 10/28/04 414 2 4142004002 41154 OPERATE MAN CIRCUIT CARD IN THE ROD CONTROL SYSTEM.
A RX TRIP OCCURRED ON LOW RX COOLANT SYSTEM FLOW FOLLOWING THE LOSS OF A RCP. THE CAUSE WAS AN INTERNAL CATAWBA 2 12/07/01 414 2 4142001003 38550 OPERATE AUTO ELECTRICAL FAULT IN THE RCP MOTOR.
A TURBINE/RX TRIP OCCURRED ON HIGH SG WATER LEVEL DURING A FEEDWATER TRANSIENT. THE CAUSE WAS A LOSS OF CONTROL POWER TO A FEEDWATER PUMP ATTRIBUTED TO WATER INTRUSION INTO THE FEEDWATER PUMP CONTROL PANEL FROM HEAVY RAINS CATAWBA 2 06/05/00 414 2 4142000003 37059 OPERATE AUTO AND ROOF REPAIRS.
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be r um n tN tio ep cr ip or n /D tR atio es E DA Even ifi se NA TE c OD Ca M DO CK ns tN E u PL EN ET ee ot M AM NO AN T RE Ev UN Sc T EV GI ON Lic en IT SC ram TE S
e R THE REACTOR WAS MANUALLY TRIPPED FOLLOWING THE TRIP OF A REACTOR RECIRCULATION PUMP TRIP. THE CAUSE OF THE RECIRC PUMP TRIP WAS FAILURE OF THE PUMP MOTOR DUE TO INSULATION CLINTON 1 10/15/09 461 3 4612009005 45433 OPERATE MAN BREAKDOWN.
THE B REACTOR RECIRCULATION PUMP TRIPPED CAUSING THE REACTOR VESSEL LEVEL TO SWELL TO GREATER THAN 48 INCHES. THE REACTOR TRIPPED AUTOMATICALLY ON HIGH REACTOR WATER CLINTON 1 02/10/08 461 3 4612008001 43976 OPERATE AUTO LEVEL.
A TURBINE TRIP/RX SCRAM OCCURRED DUE TO AN OPEN CIRCUIT IN THE CURRENT TRANSFORMER OF THE MAIN GENERATOR OUTPUT.
THE CAUSE WAS INADEQUATE WORKMANSHIP RESULTING IN A LOOSE TERMINAL SCREW ON THE CURRENT TRANSFORMER LEAD CLINTON 1 03/20/06 461 3 4612006001 42430 OPERATE AUTO WIRE.
THE HPCS SYSTEM ACTUATED RESULTING IN A REACTOR TRIP DUE TO HIGH WATER LEVEL. THE CAUSE OF THE HPCS ACTUATION IS A MOMENTARY LOSS OF THE DIVISION 4 NSPS INVERTER DUE TO A BAD CLINTON 1 08/27/06 461 3 4612006003 42807 OPERATE AUTO SOLDER JOINT.
A RX SCRAM RESULTED FROM A GENERATOR TRIP. THE CAUSE WAS VIBRATION FATIGUE OF COMPONENTS (CABLE AND OR PIECE OF ALUMINUM LAMINATE) WITHIN THE "B" ISOLATED PHASE BUS DUCT COOLING SYSTEM RESULTING FROM AN INCREASE IN THE DESIGN AIR CLINTON 1 03/22/04 461 3 4612004001 40604 OPERATE AUTO FLOW RATE.
A TURBINE TRIP/RX SCRAM OCCURRED DUE TO A FAULT ON THE GRID EXTERNAL TO THE STATION FROM A LIGHTNING STRIKE ON THE "A" PHASE OF THE BROKAW LINE. LEGACY DESIGN VULNERABILITIES CLINTON 1 07/13/04 461 3 4612004003 40868 OPERATE AUTO ALLOWED THE FAULT TO RESULT IN AN UNEXPECTED RX TRIP.
THE RX WAS MANUALLY TRIPPED FROM VIBRATIONS ON THE MAIN TURBINE TRENDING UP TO THE TRIP SETPOINT. THE CAUSE WAS DEFICIENT OPERATING PROCEDURES WHICH DID NOT PROVIDE SUFFICIENT OPERATING RESTRICTIONS OF THE NEW MONOBLOCK CLINTON 1 04/11/03 461 3 4612003002 39749 OPERATE MAN TURBINE ROTOR.
THE RX WAS MANUALLY SCRAMMED ON LOW FEEDWATER SUCTION PRESSURE AND DECREASING RX WATER LEVEL. THE CAUSE WAS A LOST 480 V BUS DUE TO A LACK OF OVERLOAD CIRCUIT PROTECTION CLINTON 1 12/02/03 461 3 4612003003 40368 OPERATE MAN FOR A BRANCH CIRCUIT.
A RX SCRAM OCCURRED ON HIGH RX WATER LEVEL WHEN A RX FEED PUMP FAILED TO RESPOND TO A LOWERED DEMAND SIGNAL DURING POWER UPRATE TESTING ON FEEDWATER LEVEL CONTROL. THE CAUSE WAS LOCK UP OF THE RX FEED PUMP LIMIT SWITCH GUIDE CLINTON 1 05/13/02 461 3 4612002002 38916 OPERATE AUTO FROM MECHANICAL BINDING.
A TURBINE TRIP AND RX SCRAM OCCURRED FOLLOWING A GENERATOR TRIP AND LOCKOUT RESULTING FROM A FALSE ACTUATION OF THE MAIN TRANSFORMER SUDDEN PRESSURE FAULT RELAY. THE CAUSE WAS A FAULTY RELAY RESULTING FROM A CLINTON 1 07/04/02 461 3 4612002003 39041 OPERATE AUTO MANUFACTURING DEFECT.
A TURBINE TRIP/RX SCRAM OCCURRED DUE TO LOW TURBINE EMERGENCY TRIP SYSTEM PRESSURE DURING TURBINE VALVE TESTING. THE CAUSE WAS FAILURE TO INSTALL AN EHC FLUID FLOW RESTRICTING ORIFICE AS RECOMMENDED IN A GENERAL ELECTRIC CLINTON 1 02/04/01 461 3 4612001002 37714 OPERATE AUTO TECHNICAL INFORMATION LETTER.
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e R A SCRAM OCCURRED ON HIGH RX WATER LEVEL WHILE A SURVEILLANCE WAS BEING PERFORMED ON A LEVEL TRANSMITTER FOR THE FEEDWATER LEVEL CONTROL SYSTEM. THE CAUSE WAS A CLINTON 1 07/24/01 461 3 4612001003 38164 OPERATE AUTO TECHNICIAN INCORRECTLY PERFORMING A STEP IN THE PROCEDURE.
THE RX WAS MANUALLY SCRAMMED FOLLOWING A LOSS OF FEEDWATER. THE CAUSE WAS A LOSS OF A 4160 VAC BUS DUE TO A CLINTON 1 05/17/00 461 3 4612000001 37008 OPERATE MAN MISLABELED TEST SWITCH.
A RX SCRAM OCCURRED ON MSIV CLOSURE DURING A STEAM LINE TUNNEL LEAK DETECTION SYSTEM SURVEILLANCE. THE PROCEDURE HAD INADEQUATE PROVISIONS FOR PREVENTING AN EXISTING FAULT IN THE OPPOSITE CHANNEL FROM COMPLETING THE ACTUATION CLINTON 1 12/18/00 461 3 4612000007 37614 OPERATE AUTO LOGIC.
THE REACTOR WAS MANUALLY TRIPPED FOLLOWING A MANUAL TRIP OF THE MAIN TURBINE. THE TURBINE WAS TRIPPED DUE TO AN UN-COOPER STATION 11/06/09 298 4 2982009002 45489 OPERATE MAN ISOLABLE LEAK IN THE TURBINE HIGH-PRESSURE FLUID SYSTEM.
THE REACTOR WAS MANUALLY TRIPPED FOLLOWING A MANUAL TRIP OF THE MAIN TURBINE DUE TO AN UN-ISOLABLE LEAK ON THE COOPER STATION 11/11/09 298 4 2982009004 45482 OPERATE MAN TURBINE HIGH-PRESSURE FLUID SYSTEM.
WHILE PERFORMING MAIN TURBINE REHEAT STOP VALVE TESTING, THE VALVE FAILED TO REOPEN WHEN REQUIRED DUE TO A JAMMED TEST SOLENOID VALVE. THE OPERATORS MANUALLY SCRAMMED THE COOPER STATION 08/09/08 298 4 2982008001 44402 OPERATE MAN REACTOR.
WHILE PERFORMING MAINTENANCE ON THE CRD HYDRAULIC CONTROL UNITS, A WATER LEAK DEVELOPED PAST THE SEATS OF ONE OR BOTH OF THE MANUAL ISOLATION VALVES. HIGH AIRBORNE ACTIVITY LEVELS RESULTED IN EVACUATION OF THE REACTOR COOPER STATION 05/19/07 298 4 2982007004 43375 OPERATE MAN BUILDING AND A MANUAL SCRAM.
THE RX WAS MANUALLY SCRAMMED ON HIGH MOISTURE SEPARATOR LEVEL AFTER A REHEAT VALVE FAILED TO OPEN DURING CONDUCT OF A SURVEILLANCE TEST. THE CAUSE WAS COOPER STATION 02/26/06 298 4 2982006001 42375 OPERATE MAN CONTAMINATION OF EHC FLUID IN THE TURBINE CONTROL SYSTEM.
THE RX WAS MANUALLY SCRAMMED ON LOWERING PLANT SERVICE AIR. THE MOST LIKELY CAUSE IS FAILURE OF THE SAC AUTO CONTROL COOPER STATION 05/22/06 298 4 2982006004 42594 OPERATE MAN SYSTEM.
REACTOR TRIPPED FROM 100% POWER FOLLOWING A A RX SCRAM OCCURRED ON LOW REACTOR WATER LEVEL. THE LOW FEEDWATER TRANSIENT THAT RESULTED IN LOW REACTOR LEVEL WAS THE RESULT OF A FEEDWATER TRANSIENT CAUSED BY AN WATER LEVEL. THE TRANSIENT WAS CAUSED BY AN COOPER STATION 04/15/05 298 4 2982005001 41601 OPERATE AUTO INSTRUMENT FAILURE IN THE RFPT SPEED CONTROL. INSTRUMENT FAILURE.
THE RX WAS MANUALLY SCRAMMED ON DEGRADING MAIN CONDENSER VACUUM. THE CAUSE WAS A TURBINE BEARING SLOP COOPER STATION 09/23/05 298 4 2982005004 42010 OPERATE MAN DRAIN LINE THAT FAILED FROM HIGH CYCLE FATIGUE.
THE RX WAS MANUALLY SCRAMMED ON HIGH MAIN TURBINE VIBRATION. THE MOST PROBABLE CAUSE FOR TURBINE BLADE FAILURE IN THE LOW PRESSURE TURBINE WAS MATERIAL CONDITION COOPER STATION 05/26/03 298 4 2982003004 39881 OPERATE MAN CONSISTANT WITH AGE-RELATED/END-OF-LIFE TYPE FAILURES.
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e R THE RX WAS MANUALLY SCRAMMED DUE TO A FIRE ON THE 345 KV WOODEN CROSS-ARM ON THE PLANT'S OUTPUT LINE FROM THE MAIN POWER TRANSFORMER TO THE 345 KV SWITCH YARD. THE CAUSE WAS FAILURE TO PROPERLY GROUND THE INSULATOR COOPER STATION 10/28/03 298 4 2982003006 40281 OPERATE MAN STRINGS ON THE WOODEN STRUCTURE.
A SCRAM OCCURRED ON LOW RX WATER LEVEL AFTER FEEDWATER PUMP "B" SPEED LOWERED UNEXPECTEDLY. THE CAUSE WAS A SPURIOUS SIGNAL THAT ENTERED THE RX FEED PUMP TURBINE COOPER STATION 11/28/03 298 4 2982003007 40362 OPERATE AUTO CONTROLLER.
A TURBINE TRIP/RX SCRAM OCCURRED FOLLOWING A "C" PHASE DIFFERENTIAL CURRENT TRIP. THE CAUSE WAS VIBRATION INDUCED INSULATION WEAR IN A CURRENT TRANSFORMER LEAD WIRE WITHIN THE MAIN TRANSFORMER, RESULTING IN A SHORT TO COOPER STATION 10/14/00 298 4 2982000011 37429 OPERATE AUTO GROUND.
THE REACTOR TRIPPED FOLLOWING A TURBINE TRIP. THE TURBINE TRIP WAS CAUSED BY A PRESSURE FAULT ON THE MAIN GENERATOR OUTPUT TRANSFORMER. THE EXACT CAUSE OF THE PRESSURE FAULT COMANCHE PEAK 1 01/09/10 445 4 4452010001 45617 OPERATE AUTO COULD NOT BE DETERMINED.
THE RX WAS MANUALLY TRIPPED FOLLOWING A LOSS OF MAIN FEEDWATER AFTER A CONDENSATE PUMP TRIPPED. THE CAUSE WAS COMANCHE PEAK 1 03/16/03 445 4 4452003002 39673 OPERATE MAN A MANUFACTURING DEFECT IN THE CONDENSATE PUMP MOTOR.
A TURBINE/RX TRIP OCCURRED FOLLOWING A GRID DISTURBANCE AND LOSS OF THE 345KV SWITCHYARD. A PROTECTIVE RELAYING SYSTEM FAILURE FAILED TO ISOLATE THE SWITCHYARD FROM THE COMANCHE PEAK 1 05/15/03 445 4 4452003003 39849 OPERATE AUTO GRID FAULT.
THE REACTOR TRIPPED FOLLOWING THE TRIP OF THE MAIN TURBINE.
THE TURBINE TRIPPED DUE TO A BROKEN SENSING LINE FEEDING THE COMANCHE PEAK 2 03/16/08 446 4 4462008001 44067 OPERATE AUTO VACUUM INPUT TO THE 2/3 LOW VACUUM TRIPS.
DURING LOAD REJECTION TESTING, OSCILLATIONS IN STEAM GENERATOR LEVEL CAUSED BOTH MAIN FEED PUMPS TO TRIP. THE COMANCHE PEAK 2 10/27/06 446 4 4462006002 42937 OPERATE MAN OPERATOR THEN MANUALLY TRIPPED THE REACTOR.
UPON RECEIPT OF A STEAM-FEED FLOW MISMATCH, THE OPERATOR TOOK MANUAL CONTROL OF THE FEED REG VALVE BUT WERE UNABLE TO CONTROL FEED FLOW. SO, THEY MANUALLY TRIPPED COMANCHE PEAK 2 10/29/06 446 4 4462006003 42945 OPERATE MAN THE REACTOR.
A TURBINE/RX TRIP OCCURRED FOLLOWING A GRID DISTURBANCE AND LOSS OF THE 345KV SWITCHYARD. A PROTECTIVE RELAYING SYSTEM FAILURE FAILED TO ISOLATE THE SWITCHYARD FROM THE COMANCHE PEAK 2 05/15/03 446 4 4452003003 39849 OPERATE AUTO GRID FAULT.
A RX TRIP OCCURRED ON RCP BREAKER OPENING. THE CAUSE WAS A COMANCHE PEAK 2 07/09/03 446 4 4462003001 39985 OPERATE AUTO "B" PHASE STATOR TO GROUND SHORT IN THE RCP MOTOR.
A TURBINE/RX TRIP OCCURRED FOLLOWING THE INGESTION OF A SMALL METALLIC COVER PLATE INTO THE MAIN GENERATOR EXCITER COMANCHE PEAK 2 12/22/03 446 4 4462003005 40406 OPERATE AUTO HOUSING AFTER A TECHNICIAN BUMPED IT.
A RX/TURBINE TRIP OCCURRED ON A MAIN GENERATOR TRIP CAUSED BY A SPURIOUS INDICATED HIGH VIBRATION ON THE MAIN GENERATOR PRIMARY WATER PUMP SHAFT. THE CAUSE WAS A FAILED OPEN CIRCUIT BREAKER IN THE VIBRATION EXPANSION COMANCHE PEAK 2 06/06/02 446 4 4462002001 38969 OPERATE AUTO MEASURING CABINET.
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e R A TURBINE/RX TRIP OCCURRED ON A SPURIOUS TURBINE TRIP SIGNAL WHILE REPLACING A BURNED OUT AMSAC TRAIN A POWER COMANCHE PEAK 2 07/18/01 446 4 4462001001 38148 OPERATE AUTO LIGHT. THE CAUSE WAS A FAILED LIGHT SOCKET.
DURING SWITCHGEAR METERING, THE A 4160V BUS TRIPPED. THE RESULTING LOSS OF THE A FEEDWATER BOOSTER PUMP AND CONDENSATE PUMP CAUSED THE OPERATORS TO MANUALLY TRIP CRYSTAL RIVER 3 01/27/09 302 2 3022009001 44807 OPERATE MAN THE REACTOR.
FOLLOWING CONTROL ROD DRIVE SURVEILLANCE TESTING, THE GROUP SEVEN RODS LOST POWER AND INSERTED INTO THE CORE.
THE OPERATOR MANUALLY TRIPPED THE REACTOR PRIOR TO EXCEEDING ANY RPS TRIP POINTS. THE CAUSE OF THE FAILURE WAS CRYSTAL RIVER 3 08/24/09 302 2 3022009003 45286 OPERATE MAN USING AN IMPROPERLY FUSED JUMPER.
WHILE REDUCING POWER FROM 100% DUE TO LOW CONDENSATE FLOW CAUSED BY THE A CONDENSATE PUMP BECOMING UNCOUPLED, FEEDWATER FLOW OSCILLATIONS OCCURRED. THE CRYSTAL RIVER 3 08/24/08 302 2 3022008003 44438 OPERATE MAN REACTOR WAS MANUALLY TRIPPED.
WITH POWER REDUCED TO 71% FOR CONDENSER WATERBOX MAINTENANCE THE INTEGRATED FEEDWATER CONTROL SYSTEM BECAME ERRATIC. THIS CAUSED THE REACTOR TO TRIP ON HIGH CRYSTAL RIVER 3 02/21/07 302 2 3022007002 43179 OPERATE AUTO PRESSURE.
THE RX WAS MANUALLY TRIPPED ON A LOSS OF BOTH MAIN FEEDWATER PUMPS AFTER THE ONLY RUNNING CONDENSATE PUMP TRIPPED. THE CAUSE WAS A FAILURE OF THE MOTOR MAGNETIC CRYSTAL RIVER 3 10/29/05 302 2 3022005003 42094 OPERATE MAN COUPLING DUE TO PUMP OPERATION IN THE CRITICAL SPEED RANGE.
A TURBINE/RX TRIP OCCURRED ON LOW FEEDWATER FLOW AFTER FEEDWATER FLOW REDUCED TO ZERO. THE CAUSE WAS AGE RELATED FAILURE OF ZENER DIODES IN THE MAIN FEEDWATER CRYSTAL RIVER 3 03/24/04 302 2 3022004001 40608 OPERATE AUTO INTEGRATED CONTROL SYSTEM.
A RX TRIP OCCURRED ON A PARTIAL LOSS OF OFFSITE POWER WHEN ONE SAFETY RELATED AND BOTH NONSAFETY 4160 V BUSES WERE LOST. THE CAUSE WAS A FAILED OFFSITE LINE COMBINED WITH A CRYSTAL RIVER 3 09/06/04 302 2 3022004003 41023 OPERATE AUTO SWITCHYARD BREAKER FAULT.
A RX TRIP OCCURRED ON HIGH RCS PRESSURE FOLLOWING A FEEDWATER TRANSIENT WHILE TROUBLESHOOTING CONTROL PROBLEMS WITH THE "B" MAIN FEEDWATER PUMP. THE CAUSE WAS THE RECENT INSTALLATION OF INCORRECT CARDS IN THE CRYSTAL RIVER 3 11/05/03 302 2 3022003005 40299 OPERATE AUTO INTEGRATED CONTROL SYSTEM.
A TURBINE/RX TRIP OCCURRED DURING 500KV SWITCHYARD MAINTENANCE. A MAIN GENERATOR OUTPUT BREAKER OPENED.
THE CAUSE WAS MISOPERATION OF A PROTECTIVE RELAY. THE RELAY CRYSTAL RIVER 3 11/07/02 302 2 3022002002 39354 OPERATE AUTO WAS REPLACED WITH ONE OF A DIFFERENT DESIGN.
DURING A PLANNED SHUTDOWN, THE REACTOR WAS MANUALLY TRIPPED DUE TO INCREASING VIBRATIONS ON A MAIN TURBINE DUANE ARNOLD 04/26/10 331 3 3312010003 45873 OPERATE MAN BEARING.
THE REACTOR WAS MANUALLY TRIPPED WHILE SHUTTING DOWN DUE TO LOSS OF CIRC WATER. ONE CIRC WATER TOWER WAS SHUTDOWN WHEN A RISER IN THE OTHER TOWER RUPTURED DUANE ARNOLD 02/01/09 331 3 3312009001 44821 OPERATE MAN RESULTING IN A LOSS OF SUPPLY TO THE CIRC WATER PUMPS.
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e R THE REACTOR WAS MANUALLY TRIPPED DUE TO RISING WATER LEVEL DURING LEVEL INSTRUMENT CALIBRATION. THE CAUSE OF RISING LEVEL WAS AN INADEQUATE PROCEDURE THAT RESULTED IN DUANE ARNOLD 04/03/09 331 3 3312009003 44965 OPERATE MAN THE LOSS OF LEVEL INDICATION AND INCREASED FEED FLOW.
THE REACTOR SCRAMMED WHILE RESTORING THE REACTOR WATER LEVEL/PRESSURE INSTRUMENTS FOLLOWING CALIBRATION. THE EVENT WAS CAUSED BY FAILURE TO CLOSE AN INSTRUMENT THE SCRAM WAS CAUSED WHILE RESTORING THE REACTOR ISOLATION VALVE, WHICH RESULTED IN A SENSED LOW REACTOR WATER LEVEL/PRESSURE INSTRUMENTS TO SERVICE DUANE ARNOLD 10/08/09 331 3 3312009004 45421 OPERATE AUTO WATER LEVEL ON TWO RPS CHANNELS. FOLLOWING CALIBRATION.
THE REACTOR WAS MANUALLY SCRAMMED DUE TO HIGH LEVELS OF CHLORIDES, SULFATES, AND CONDUCTIVITY, DUE TO RESIN INTRUSION FOLLOWING THE PLACEMENT OF A CONDENSATE DUANE ARNOLD 03/18/07 331 3 3312007006 43247 OPERATE MAN DEMINERALIZER IN SERVICE.
DURING PLANNED PREVENTIVE MAINTENANCE OF A NON-ESSENTIAL BUS, LOSS OF 4160V BUS 1A2 RESULTED IN LOSS OF THE B CONDENSATE AND REACTOR FEED PUMPS. THE REACTOR WAS DUANE ARNOLD 04/02/07 331 3 3312007007 43271 OPERATE MAN MANUALLY TRIPPED DUE TO LOWERING REACTOR VESSEL LEVEL.
THE REACTOR TRIPPED AUTOMATICALLY FOLLOWING A TURBINE TRIP DURING TURBINE TESTING. THE CAUSE OF THE TRIP IS A NOISE SPIKE IN COMBINATION WITH NORMALLY OPEN CONTACTS BEING STUCK DUANE ARNOLD 11/06/06 331 3 3312006005 42966 OPERATE AUTO CLOSED.
THE RX WAS MANUALLY SCRAMMED ON THE RATE AND MAGNITUDE OF CONTINUED CONDUCTIVITY INCREASES IN THE CONDENSER HOTWELL, RX FEEDWATER, AND RCS. THE CAUSE WAS A PUNCTURED CONDENSER TUBE RESULTING FROM FATIGUE FAILURE OF A DUANE ARNOLD 02/01/03 331 3 3312003001 OPERATE MAN CONDENSER STEAM DEFLECTOR PLATE.
THE RX WAS MANUALLY SCRAMMED ON INCREASING RX COOLANT SYSTEM CONDUCTIVITY. THE CAUSE WAS RESIN INTRUSION FROM A CONDENSATE DEMINERALIZER THAT HAD A MANUFACTURING DUANE ARNOLD 11/07/03 331 3 3312003005 40301 OPERATE MAN DEFECT.
THE RX WAS MANUALLY SCRAMMED ON DEGRADING CONDENSER VACUUM DURING POWER ASCENSION FOLLOWING REPAIR OF CONDENSER EXPANSION JOINT. THE CAUSE WAS AIR INLEAKAGE FROM A FAILED WELDED SEAM BETWEEN THE HIGH PRESSURE DUANE ARNOLD 11/25/03 331 3 3312003006 40353 OPERATE MAN CONDENSER AND THE CROSSOVER LOOP SEAL.
THE RX WAS MANUALLY SCRAMMED ON DECREASING RX WATER LEVEL AFTER A FEEDWATER PUMP MINIMUM FLOW BYPASS VALVE FAILED OPEN. THE AFFECTED FEEDPUMP TRIPPED ON LOW SUCTION PRESSURE. THE CAUSE WAS A FAILED MINIMUM FLOW VALVE DUANE ARNOLD 08/12/01 331 3 3312001003 38202 OPERATE MAN CONTROLLER.
THE RX WAS MANUALLY TRIPPED IN ANTICIPATION OF LOW RX WATER LEVEL FOLLOWING A LOSS OF FEED. ONE OF TWO FEED PUMPS TRIPPED FOLLOWING THE LOSS OF AN INSTRUMENT BUS. THE CAUSE WAS A FAILED INVERTER BUT NO DEFINITIVE ROOT CAUSE DUANE ARNOLD 10/17/01 331 3 3312001006 38398 OPERATE MAN COULD BE FOUND.
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e R A RX SCRAM OCCURRED ON A FALSE LOW RX VESSEL WATER LEVEL SIGNAL DURING RESTORATION FROM A TEST OF RX VESSEL WIDE RANGE LEVEL INSTRUMENTATION. THE CAUSE WAS THE USE OF AN DUANE ARNOLD 01/05/00 331 3 3312000001 36565 OPERATE AUTO INADEQUATE INSTRUMENT RESTORATION PROCESS.
A TURBINE TRIP/RX TRIP OCCURRED FOLLOWING A MAIN GENERATOR LOCKOUT. THE CAUSE WAS A LOOSE CONNECTION ON A DUANE ARNOLD 06/23/00 331 3 3312000002 37110 OPERATE AUTO MAIN GENERATOR CURRENT TRANSFORMER SECONDARY LEAD. NO CHANGES FOR LER REV 1.
POWER WAS REDUCED AND SCRAMMED DUE TO DEGRADED CONDENSER PRESSURE. THE CAUSE WAS AIR IN-LEAKAGE INTO THE CONDENSER FROM A BROKEN LOW PRESSURE TURBINE BEARING WASTE WATER AND OIL DRAIN PIPE THAT IS ROUTED THROUGH THE DAVIS-BESSE 09/06/06 346 3 3462006003 42828 OPERATE MAN CONDENSER.
A RX TRIP OCCURRED DURING SURVEILLANCE TESTING OF THE CONTROL ROD DRIVE TRIP BREAKERS. THE CAUSE WAS A PREVIOUSLY DAVIS-BESSE 08/04/04 346 3 3462004002 40921 OPERATE AUTO FAILED FUSE FOR ONE TRIP BREAKER DUE TO AGE AND FATIGUE.
THE REACTOR WAS MANUALLY TRIPPED DUE TO HIGH VIBRATIONS COOK 1 02/02/08 315 3 3152008001 43956 OPERATE MAN ON MAIN TURBINE BEARINGS 5 AND 6.
THE REACTOR WAS MANUALLY TRIPPED AFTER A MALFUNCTION OF THE MAIN TURBINE GENERATOR RESULTED IN HIGH TURBINE COOK 1 09/20/08 315 3 3152008006 44507 OPERATE MAN VIBRATIONS AND A FIRE IN THE GENERATOR.
A MALFUNCTION OF THE MAIN FEEDWATER PUMP DIGITAL CONTROL SYSTEM RESULTED IN A REACTOR SCRAM DUE TO LOW STEAM GENERATOR LEVEL. THE CAUSE OF THE CONTROL SYSTEM FAILURE WAS AN OVERVOLTAGE CONDITION ON THE DIGITAL CONTROL COOK 1 08/28/07 315 3 3152007001 43605 OPERATE AUTO SYSTEM POWER SUPPLY.
A RX TRIP OCCURRED ON INTERMEDIATE RANGE HIGH FLUX DURING NORMAL PLANT STARTUP PREPARATIONS TO SYNCHRONIZE THE GENERATOR WITH THE GRID. THE CAUSE WAS AGE RELATED COOK 1 04/26/05 315 3 3152005001 41639 OPERATE AUTO DEGRADATION OF A LEVEL ADJUST POTENTIOMETER.
A MAIN TURBINE/RX TRIP OCCURRED FOLLOWING A FAULT AND AUTOMATIC TRIP OF THE MAIN TRANSFORMER. A SUDDEN INTERNAL FAULT WITHIN THE TRANSFORMER RUPTURED THE TRANSFORMER FIRE WAS EXTINGUISHED WITHIN 35 MINUTES OF THE COOK 1 01/15/03 315 3 3152003001 39513 OPERATE AUTO OIL TANK RESULTING IN A LOSS OF OIL AND A FIRE. EVENT WITH ONE MINOR REFLASH.
THE RX WAS MANUALLY TRIPPED ON FEED PUMP CONDENSER FOULING FOLLOWING AN INFLUX OF FISH ON THE INTAKE SCREENS FOR THE CIRCWATER AND ESSENTIAL SERVICE WATER SYSTEMS. THE CAUSE WAS INADEQUATE OPERATIONAL RESPONSE AND COOK 1 04/24/03 315 3 3152003003 39790 OPERATE MAN INADEQUATE MAINTENANCE OF THE SCREENS. AN SSF IS ALSO CODED FOR A LOSS OF ESW.
THE RX WAS MANUALLY TRIPPED ON THE LOSS OF A MAIN FEEDWATER PUMP ON LOW FEED PUMP TURBINE CONDENSER VACUUM. DEBRIS ENTERED THE FEEDWATER PUMP CONDENSER FOLLOWING THE START OF A CIRCULATING WATER PUMP AND COOK 1 06/14/02 315 3 3152002005 38993 OPERATE MAN RESULTED IN THE LOSS OF CONDENSER VACUUM.
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e R THE RX WAS MANUALLY TRIPPED WHEN A MAIN FEEDWATER PUMP TRIPPED DUE TO A LOSS OF VACUUM IN THE MAIN FEEDWATER PUMP CONDENSER. THE CAUSE WAS CORROSION DEBRIS COOK 1 02/15/01 315 3 3152001001 37751 OPERATE MAN OBSTRUCTING FLOW AT THE CONDENSER'S INLET SIDE TUBESHEET.
THE REACTOR WAS MANUALLY TRIPPED WHEN INDICATIONS WERE RECEIVED THAT A REACTOR COOLANT PUMP SEAL HAD MALFUNCTIONED. THE RCP SEAL FAILED DUE TO THE BUILDUP OF COOK 2 07/26/09 316 3 3162009001 45228 OPERATE MAN CORROSION PRODUCTS.
A RX TRIP OCCURRED ON RX COOLANT PUMP BUS UNDERVOLTAGE.
THE CAUSE WAS POOR BRUSH CONTACT ON THE MAIN GENERATOR COOK 2 11/08/05 316 3 3162005001 42125 OPERATE AUTO EXCITER ROTOR WHICH CAUSED THE UNDERVOLTAGE CONDITION.
A RX TRIP OCCURRED ON HIGH NEGATIVE RATE RPS ACTUATION DURING A RX TRIP BYPASS BREAKER MANIPULATION TEST. AN OPERATOR INCORRECTLY INSERTED A BREAKER RACKING BAR RESULTING IN A MOMENTARY GROUND, LOSS OF ROD CONTROL MG COOK 2 03/29/04 316 3 3162004001 40622 OPERATE AUTO SET, AND MULTIPLE RODS DROPPED.
A TURBINE/RX TRIP OCCURRED ON HIGH SG WATER LEVEL FOLLOWING A FEEDWATER FLOW TRANSIENT DURING A POWER REDUCTION. THE CAUSE WAS INADEQUATE MANUAL MAIN COOK 2 04/08/04 316 3 3162004002 40660 OPERATE AUTO FEEDWATER CONTROL AND INADEQUATE COMMUNICATIONS.
A RX TRIP OCCURRED ON LOW SG WATER LEVEL AFTER A FEEDWATER REGULATING VALVE FAILED CLOSED. THE CAUSE WAS A FAILED 24 COOK 2 02/05/03 316 3 3162003002 39564 OPERATE AUTO VDC CONTROL GROUP POWER SUPPLY.
THE RX WAS MANUALLY TRIPPED ON DEGRADED FORBAY CONDITIONS FOLLOWING AN INFLUX OF FISH ON THE INTAKE SCREENS FOR THE CIRCWATER AND ESSENTIAL SERVICE WATER SYSTEMS. THE CAUSE WAS INADEQUATE OPERATIONAL RESPONSE COOK 2 04/24/03 316 3 3152003003 39790 OPERATE MAN AND INADEQUATE MAINTENANCE OF INTAKE SCREENS. AN SSF IS ALSO CODED FOR A LOSS OF ESW.
A SCRAM OCCURRED ON LOW SG WATER LEVEL FOLLOWING THE UNPLANNED CLOSURE OF SG TWO AND THREE FEEDWATER ISOLATION VALVES. A TECHNICIAN INADVERTENTLY INTRODUCED A GROUND WHILE CALIBRATING THE CONTROL ROOM INSTRUMENT COOK 2 12/30/03 316 3 3162003005 40419 OPERATE AUTO DISTRIBUTION BUS, CAUSING THE ISOLATION.
A RX TRIP OCCURRED ON LOW SG WATER LEVEL COINCIDENT WITH LOW FEEDWATER FLOW AFTER A FEED REGULATING VALVE FAILED CLOSED. THE CAUSE WAS AN INSTRUMENT RACK POWER SUPPLY COOK 2 05/12/02 316 3 3162002005 38915 OPERATE AUTO FAILURE.
DECREASING VACUUM CAUSES SCRAM. MAIN STM LINES A TURBINE/RX TRIP OCCURRED ON DECREASING CONDENSER MANUALLY ISOLATED TO LIMIT RCS COOLDOWN.
VACUUM WHILE FLUSHING THE CONDENSER WATERBOXES. THE FEEDWATER ISOLATION TRIPPED MAIN FEEDWATER APPARENT CAUSE WAS A PREVIOUSLY UNRECOGNIZED STEAM SIDE PUMPS & ISOLATED NORMAL FEEDWATER SUPPLY. AFW COOK 2 07/22/02 316 3 3162002006 39081 OPERATE AUTO HEAT TRANSFER ANOMALY IN THE "C" MAIN CONDENSER. STARTED.
A RX TRIP OCCURRED ON HIGH NEGATIVE FLUX RATE FOLLOWING THE LOSS OF BOTH ROD CONTROL MG SETS. THE CAUSE WAS A FAILED RESISTOR ON ONE ROD CONTROL MG SET VOLTAGE COOK 2 10/07/01 316 3 3162001004 38362 OPERATE AUTO REGULATOR.
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e R A RX TRIP OCCURRED ON LOW SG WATER LEVEL WHEN A MAIN FEEDWATER REGULATING VALVE FAILED CLOSED. THE VALVE CLOSED ON LOSS OF AIR WHEN A VALVE MOUNTED AIR TEST CONNECTION BROKE OFF AFTER CONTACTING STRUCTURAL STEEL DURING DIABLO CANYON 1 06/03/02 275 4 2752002004 38961 OPERATE AUTO THERMAL EXPANSION OF THE PIPING.
A TURBINE/RX TRIP RESULTED FROM A 12 KV PHASE TO PHASE FAULT. THE CAUSE WAS POSTULATED TO BE A THERMAL FAILURE OF DIABLO CANYON 1 05/15/00 275 4 2752000004 37001 OPERATE AUTO A BOLTED BUS CONNECTION. NO CHANGES.
THE RX WAS MANUALLY TRIPPED DURING STARTUP DUE TO A ROD CONTROL SYSTEM FAILURE. THE CAUSE WAS A FAILURE OF THE PORTION OF THE SUPERVISORY BUFFER MEMORY CARD THAT DIABLO CANYON 1 11/05/00 275 4 2752000011 37491 STARTUP MAN CONTROLS INWARD ROD MOTION.
A RX TRIP OCCURRED ON A SPURIOUS RATE TRIP SIGNAL WHILE TESTING THE POWER RANGE NUCLEAR INSTRUMENTATION. THE CAUSE WAS AN INTERMITTENT ELECTRICAL SHORT CIRCUIT IN TEST DIABLO CANYON 1 11/20/00 275 4 2752000012 37535 OPERATE AUTO EQUIPMENT CONCURRENT WITH A PREEXISTING TRIPPED CHANNEL.
THE REACTOR WAS MANUALLY TRIPPED FOLLOWING THE LOSS OF THE 2-1 MFW PUMP. THE MFW PUMP WAS LOST DUE TO WATER SPRAYING ON ITS CONTROL CONSOLE FROM A LEAKY FLANGE ON A DIABLO CANYON 2 03/26/11 323 4 46701 OPERATE MAN FEEDWATER HEATER RELIEF VALVE.
THE REACTOR AUTOMATICALLY TRIPPED FOLLOWING A GENERATOR TRIP DUE TO A FIRE IN THE MAIN BANK TRANSFORMER. THE EMERGENCY BUSES REMAINED ENERGIZED FROM OFFSITE POWER.
DIABLO CANYON 2 08/16/08 323 4 3232008001 44419 OPERATE AUTO AFW AUTO INITIATED FOLLOWING THE SCRAM.
THE REACTOR WAS MANUALLY TRIPPED DUE TO HIGH DIFFERENTIAL PRESSURE ACROSS THE CIRC WATER TRAVELING SCREENS. THE CAUSE OF THE HIGH DIFFERENTIAL PRESURE WAS A RAPID INFLUX OF DIABLO CANYON 2 10/21/08 323 4 3232008002 44588 OPERATE MAN JELLYFISH.
AN ELECTRICAL DISTURBANCE IN THE UNIT 2 12-KV NON-VITAL BUS D RESULTED IN RCP 2-2 AND 2-4 BREAKERS TRIPPING ON DIABLO CANYON 2 12/12/06 323 4 3232006004 43047 OPERATE AUTO UNDERVOLTAGE, RESULTING IN A REACTOR SCRAM.
THE RX WAS MANUALLY TRIPPED WHEN A FEEDWATER REGULATING VALVE FAILED CLOSED. THE CAUSE WAS RANDOM FAILURE OF A COIL DIABLO CANYON 2 02/09/02 323 4 3232002002 38687 OPERATE MAN IN A SOLENOID VALVE WHICH APPEARED TO BE AGE RELATED.
THE REACTOR WAS MANUALLY SCRAMMED FOLLOWING LOSS OF FEEDWATER. THE CONDENSATE PREFILTERS ISOLATED EARLIER AND THE BYPASS VALVES SHUT WHEN THE COMPUTER CONTROLLING THE DRESDEN 2 05/04/07 237 3 2372007002 43346 OPERATE MAN VALVES WAS BEING REPLACED.
A REACTOR SCRAM OCCURRED WHEN MAIN STEAM ISOLATION DRESDEN 2 07/04/06 237 3 2372006004 42685 OPERATE AUTO VALVE 1A CLOSED DUE TO LOSS OF AIR SUPPLY.
A RX SCRAM OCCURRED ON MSIV CLOSURE FOLLOWING MAIN STEAM LINE HIGH FLOW. THE CAUSE WAS AN INCREASE IN ELECTRICAL RESISTANCE BETWEEN PINS ON A TURBINE EHC SYSTEM CIRCUIT CARD THAT RESULTED IN OPENING THE TURBINE BYPASS DRESDEN 2 03/24/05 237 3 2372005002 41517 OPERATE AUTO VALVES.
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e R A RX SCRAM OCCURRED ON AN MSIV CLOSURE. THE ISOLATION CONDENSER WAS MANUALLY INITIATED FOR PRESSURE CONTROL.
THE CAUSE WAS INADEQUATE DRAINAGE OF THE MAIN STEAM LEAD THE ISOLATION CONDENSER WAS DECLARED INOPERABLE DRESDEN 2 04/24/04 237 3 2372004002 40702 OPERATE AUTO DRAIN SYSTEM. IN RE 40703.
THE RX WAS MANUALLY TRIPPED WHEN A SPURIOUS TRIP OF THE "2A" RX RECIRCULATION MG SET AND PUMP PUT THE PLANT IN A RESTRICTED REGION OF THE POWER TO FLOW MAP. THE CAUSE WAS DRESDEN 2 04/28/04 237 3 2372004004 40713 OPERATE MAN A FAILED RX RECIRCULATION PUMP MOTOR.
A RX TRIP OCCURRED ON LOW RX VESSEL WATER LEVEL AFTER A RX FEEDPUMP TRIPPED. THE CAUSE WAS A FAULT ON ONE PHASE OF DRESDEN 2 09/30/03 237 3 2372003003 40209 OPERATE AUTO THE RX FEEDPUMP CABLE.
THE RX WAS MANUALLY SCRAMMED AFTER AN UNEXPECTED STATOR WATER COOLING RUNBACK ON HIGH STATOR COOLING WATER SYTEM TEMPERATURE. THE CAUSE WAS A FAILED TEMPERATURE DRESDEN 2 12/11/03 237 3 2372003007 40388 OPERATE MAN CONTROL VALVE TEMPERATURE CONTROLLER.
THE RX WAS MANUALLY TRIPPED ON A RECIRCULATION PUMP TRIP WHILE THE UNIT WAS IN SINGLE LOOP OPERATION. THE CAUSE WAS INADEQUATE SYSTEM DESIGN THAT DOES NOT PROVIDE FOR STARTING THE STANDBY OIL PUMP WHEN THE OPERATING OIL PUMP DRESDEN 2 04/03/01 237 3 2372001002 37887 OPERATE MAN TRIPS.
A SCRAM RESULTED FROM HIGH TURBINE FIRST STAGE PRESSURE WITH THE TURBINE STOP VALVES CLOSED DURING TURBINE SHELL WARMING ACTIVITIES. THE CAUSE WAS PERSONNEL ERROR IN THAT DRESDEN 2 11/07/01 237 3 2372001005 38478 STARTUP AUTO PRESSURE WAS INADEQUATELY MONITORED.
A RX SCRAM OCCURRED FOLLOWING A GENERATOR LOAD REJECT. A BUS TO PHASE DIFFERENTIAL TRIP WAS RECEIVED WHILE CLOSING A MAIN GENERATOR OUTPUT BREAKER, CAUSING BOTH OUTPUT BREAKERS TO OPEN. THE CAUSE WAS IMPROPER RESTORATION DRESDEN 2 11/30/00 237 3 2372000004 37558 OPERATE AUTO FOLLOWING BREAKER MAINTENANCE.
THE REACTOR TRIPPED WHILE SWITCHING THE "A" RPS BUS FROM THE NORMAL TO THE RESERVE POWER SUPPLY. BEFORE THE EXPECTED HALF SCRAM SIGNAL COULD BE RESET A POWER SUPPLY FAILURE OCCURRED IN THE OPRM SYSTEM ON THE OPPOSITE RPS DRESDEN 3 10/11/10 249 3 2492010001 46325 OPERATE AUTO DIVISION.
THE REACTOR TRIPPED DUE TO A REACTOR WATER LEVEL LOW-LOW SIGNAL ALONG WITH A GROUP 1 MSIV CLOSURE. THE ISOLATION SIGNAL WAS MOST LIKELY CAUSED BY A PRESSURE TRANSIENT DRESDEN 3 10/03/09 249 3 2492009001 45409 OPERATE AUTO RESULTING FROM THE RESTORATION OF RWCU.
A TURBINE/RX TRIP OCURRED DURING MAIN TURBINE TESTING. THE CAUSE WAS A MALFUNCTION OF THE MAIN TURBINE MASTER TRIP DRESDEN 3 01/24/04 249 3 2492004001 40474 OPERATE AUTO SOLENOID VALVES RESULTING FROM IMPROPER DESIGN.
A TURBINE/RX TRIP OCCURRED ON LOW MAIN TURBINE LUBE OIL PRESSURE WHILE SWAPPING LUBE OIL COOLERS. THE CAUSE WAS INADEQUATE PROCEDURAL GUIDANCE FOR SWAPING MAIN TURBINE DRESDEN 3 01/30/04 249 3 2492004002 40491 OPERATE AUTO LUBE OIL COOLERS.
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be r um n tN tio ep cr ip or n /D tR atio es E DA Even ifi se NA TE c OD Ca M DO CK ns tN E u PL EN ET ee ot M AM NO AN T RE Ev UN Sc T EV GI ON Lic en IT SC ram TE S
e R A SCRAM OCCURRED ON A MAIN GENERATOR LOAD REJECT AND LOOP THAT OCCURRED WHEN A 345 KV SWITCHYARD BREAKER WAS OPENED TO SUPPORT TESTING AN OFFSITE LINE. THE CAUSE WAS AN EQUIPMENT FAILURE IN THE "C" PHASE OF THE 345 KV CIRCUIT DRESDEN 3 05/05/04 249 3 2492004003 40727 OPERATE AUTO BREAKER.
A TURBINE TRIP/RX SCRAM OCCURRED ON LOW DISCHARGE PRESSURE FROM THE TURBINE SHAFT BEARING OIL PUMP. THE CAUSE WAS DEGRADATION OF THE ROTOR GEAR COUPLING INSULATION RESULTING IN CURRENT FLOW THROUGH THE GEAR DRESDEN 3 07/21/02 249 3 2492002002 39080 OPERATE AUTO SHAFTS AND ACCELERATED WEAR OF THE BEARINGS.
A RX SCRAM OCCURRED ON LOW RX WATER LEVEL RESULTING DURING FLOW AND POWER OSCILLATIONS FROM A RX RECIRCULATION PUMP. THE CAUSE WAS DEBRIS IN THE RX DRESDEN 3 04/27/01 249 3 2492001002 37948 OPERATE AUTO RECIRCULATION MG SET SCOOP TUBE POSITIONER MOTOR.
THE RX WAS MANUALLY SCRAMMED DUE TO INCREASING DRYWELL PRESSURE. THE CAUSE WAS A LOSS OF CONTAINMENT COOLING AFTER A COMPONENT COOLING WATER TEMPERATURE CONTROL DRESDEN 3 07/05/01 249 3 2492001003 38116 OPERATE MAN VALVE DISK AND STEM SEPARATED.
A RX SCRAM OCCURRED DURING THE TRANSFER OF RPS BUS POWER SUPPLIES FOLLOWING PREVENTIVE MAINTENANCE. WHILE TRANSFERRING BUS "B", BUS "A" ALSO LOST POWER. THE ASSOCIATED MG SET DRIVE MOTOR BREAKER TRIPPED BECAUSE OF DRESDEN 3 05/03/00 249 3 2492000002 36959 OPERATE AUTO PERSONNEL ERROR DURING THE MAINTENANCE.
THE RX WAS MANUALLY SCRAMMED ON DECREASING CONDENSER VACUUM AND INCREASING CONDENSATE TEMPERATURE. THE CAUSE WAS FAILURE TO FOLLOW PROCEDURES DURING POST DRESDEN 3 05/04/00 249 3 2492000003 36975 OPERATE MAN MODIFICATION TESTING OF THE SYSTEM.
THE REACTOR TRIPPED FOLLOWING A TURBINE TRIP. THE TURBINE TRIP WAS CAUSED BY A SHORTED CURRENT TRANSFORMER WIRE IN THE MAIN GENERATOR Z PHASE LINE TERMINAL BUSHING FERMI 2 03/25/10 341 3 3412010001 45789 OPERATE AUTO ENCLOSURE.
FOLLOWING A PARTIAL LOSS OF OFFSITE POWER DUE TO SEVERE WEATHER, THE REACTOR TRIPPED FOLLOWING A TRIP OF THE MAIN TURBINE GENERATOR. THE TURBINE TRIPPED DUE TO FAST CLOSURE FERMI 2 06/06/10 341 3 3412010002 45979 OPERATE AUTO OF A TURBINE CONTROL VALVE.
THE REACTOR TRIPPED FOLLOWING A TURBINE TRIP DUE TO LOSS OF CONDENSER VACUUM. THE LOSS OF VACUUM WAS CAUSED BY EROSION OF A STEAM JET AIR EJECTOR STEAM SUPPLY FIRST STAGE FERMI 2 10/24/10 341 3 3412010003 46359 OPERATE AUTO NOZZLE, WHICH RESULTED IN LOSS OF EJECTOR CAPACITY.
WHILE REDUCING POWER FOR SHUTDOWN, THE MAIN TURBINE #1 BEARING EXPERIENCED HIGH VIBRATIONS. THE OPERATORS MANUALLY TRIPPED THE REACTOR. THE CAUSE OF THE HIGH VIBRATIONS WAS ATTRIBUTED TO HIGH PRESSURE TURBINE RUB FERMI 2 03/28/09 341 3 3412009001 44942 OPERATE MAN TRANSVERSING BEARING 1.
THE REACTOR WAS MANUALLY TRIPPED IN RESPONSE TO HYDROGEN GAS IN-LEAKAGE INTO THE STATOR COOLING WATER SYSTEM FROM THE MAIN TURBINE GENERATOR. THE IN-LEAKAGE WAS CAUSED BY A FERMI 2 09/30/09 341 3 3412009002 45394 OPERATE MAN HOLE WORN INTO THE COPPER STATOR WATER BAR.
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be r um n tN tio ep cr ip or n /D tR atio es E DA Even ifi se NA TE c OD Ca M DO CK ns tN E u PL EN ET ee ot M AM NO AN T RE Ev UN Sc T EV GI ON Lic en IT SC ram TE S
e R THE REACTOR WAS MANUALLY TRIPPED FOLLOWING THE TRIP OF BOTH REACTOR RECIRC PUMPS. THE RECIRC PUMPS TRIPPED DUE TO AN INTERMITTENT FAILURE OF THE 65G BUS UNDERVOLTAGE TRIP FERMI 2 01/31/08 341 3 3412008001 43948 OPERATE MAN LOGIC.
AN ALTERNATE ROD INSERTION/RECIRC PUMP TRIP INITIATED DUE TO AN INVALID REACTOR WATER LEVEL SIGNAL. A MANUAL SCRAM WAS PERFORMED. THE INVALID LEVEL SIGNAL RESULTED FROM AN OPERATOR PERFORMING A SAFETY TAG-OUT OF THE REACTOR LEVEL FERMI 2 11/15/07 341 3 3412007002 43784 STARTUP MAN REFERENCE LEG.
A TURBINE TRIP/RX SCRAM OCCURRED ON MAIN TRANSFORMER OIL HIGH TEMP FOLLOWED BY GENERATOR DIFFERENTIAL RELAYING DURING A MAIN TRANSFORMER CLEANING ACTIVITY. THIS EVENT WAS CAUSED BY AN INTERNAL FAULT TO GROUND ON THE FERMI 2 06/15/06 341 3 3412006002 42643 OPERATE AUTO TRANSFORMER'S HIGH VOLTAGE WINDING.
A REACTOR SCRAM OCCURRED BECAUSE OF A PARTIAL LOSS OF FERMI 2 07/29/06 341 3 3412006003 42738 OPERATE AUTO FEEDWATER THAT RESULTED FROM LOSS OF DIVISION 1 POWER.
THE RX WAS MANUALLY SCRAMMED ON INDICATIONS OF UNIDENTIFIED RX COOLANT LEAKAGE GREATER THAN TEN GPM. THE LEAKAGE WAS LATER DISCOVERED TO BE FROM THE RX BUILDING CLOSED COOLING WATER SYSTEM VIA A FAILED END BELL GASKET ON FERMI 2 01/24/05 341 3 3412005001 41354 OPERATE MAN DRYWELL COOLER NUMBER FOUR.
A TURBINE/RX TRIP OCCURRED WHEN AN AUTOMATIC VOLTAGE REGULATOR TRIP RELAY CAUSED A MAIN GENERATOR TRIP. THE CAUSE WAS A FAILED ELECTRONIC COMMUNICATION SYSTEM IN THE FERMI 2 09/03/04 341 3 3412004002 41017 OPERATE AUTO MAIN GENERATOR EXCITATION SYSTEM.
A TURBINE/RX TRIP OCCURRED ON A MAIN GENERATOR TRIP FROM AN AUTO VOLTAGE REGULATOR TRIP. THE CAUSE WAS THE INSTALLATION OF THREE NEW ELECTRONIC CARDS IN THE GENERATOR EXCITER THAT WERE INCOMPATIBLE WITH THE FERMI 2 12/04/04 341 3 3412004004 41243 OPERATE AUTO ORIGINAL SYSTEM DESIGN.
A TURBINE TRIP/RX SCRAM OCCURRED DURING ELECTRICAL GRID VOLTAGE FLUCTUATIONS. THE CAUSE WAS A MAJOR GRID FERMI 2 08/14/03 341 3 3412003002 40075 OPERATE AUTO DISTURBANCE AND BLACKOUT.
A TURBINE TRIP/RX SCRAM OCCURRED WHEN CONDENSER PRESSURE INCREASED ABOVE THE TURBINE TRIP SETPOINT. CONDENSER VACUUM WAS LOST WHEN CIRCULATING PUMP NUMBER TWO FAILED. THE CAUSE WAS A SEPARATION OF THE MOTOR AND PUMP DECAY HEAT WAS REMOVED USING ONE RFP THROUGH FERMI 2 10/02/02 341 3 3412002004 39239 OPERATE AUTO FROM FATIGUE FAILURE OF THE BOLTS. THE TURBINE BYPASS VALVES TO THE MAIN CONDENSER.
THE RX WAS MANUALLY SCRAMMED DUE TO THE INABILITY TO DRIVE IN CONTROL RODS. THE CAUSE WAS A FAULTY VOLTAGE REGULATOR FERMI 2 12/29/02 341 3 3412002006 39476 OPERATE MAN ASSOCIATED WITH THE MASTER POWER UNIT.
THE RX WAS MANUALLY SCRAMMED FOLLOWING THE LOSS OF STATOR WATER COOLING. A HEAT EXCHANGER VENT LINE BROKE OFF WHILE TAKING A STATOR WATER SAMPLE. THE CAUSE WAS INADEQUATE PROBLEM RESOLUTION DATING BACK TO 1996 AND FERMI 2 12/06/01 341 3 3412001004 38542 OPERATE MAN INADEQUATE ORIGINAL VENT LINE DESIGN.
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be r um n tN tio ep cr ip or n /D tR atio es E DA Even ifi se NA TE c OD Ca M DO CK ns tN E u PL EN ET ee ot M AM NO AN T RE Ev UN Sc T EV GI ON Lic en IT SC ram TE S
e R THE RX WAS MANUALLY SCRAMMED AFTER A RX RECIRC PUMP WAS TRIPPED BECAUSE OF SPEED FLUCTUATIONS. LACKING SPECIFIC PROCEDURAL GUIDANCE CONCERNING LOW POWER SINGLE RECIRC FERMI 2 04/01/00 341 3 3412000004 36854 OPERATE MAN PUMP OPERATIONS, OPERATORS SCRAMMED THE PLANT.
THE REACTOR TRIPPED AT 8% POWER, WHEN THE MODE SWITCH WAS PLACED IN RUN. THE TRIP WAS CAUSED BY UPSCALE TRIP SIGNALS FROM THE INTERMEDIATE RANGE NUCLEAR INSTRUMENTS.
THE UPSCALE TRIP SIGNALS WERE CAUSED BY AN ELECTRICAL NOISE HATCH 1 05/10/09 321 2 3212009004 45052 OPERATE AUTO SPIKE.
THE REACTOR TRIPPED FOLLOWING A TURBINE TRIP. THE CAUSE OF THE TURBINE TRIP WAS DUE TO MODIFICATIONS TO THE TURBINE ELECTRO-HYDRAULIC CONTROLLER SUCH THAT A LOW PRESSURE WAS SENSED IN THE EHC DURING TESTING, RESULTING IN A TURBINE HATCH 1 07/04/08 321 2 3212008003 44337 OPERATE AUTO TRIP.
A CONDENSATE BOOSTER PUMP TRIPPED ON LOW SUCTION PRESSURE CAUSING BOTH FEEDWATER PUMPS TO TRIP. THE REACTOR WAS MANUALLY TRIPPED. THE CAUSE OF THE LOW SUCTION PRESSURE WAS FAILURE OF THE DC POWER SUPPLY FOR HATCH 1 11/22/08 321 2 3212008004 44679 OPERATE MAN THE STEAM JET AIR EJECTOR DP CONTROLLER.
A TURBINE TRIP/RX SCRAM OCCURRED ON A MAIN TRANSFORMER INTERNAL FAULT WHICH RESULTED IN A MAIN GENERATOR NEUTRAL HATCH 1 10/29/05 321 2 3212005002 42096 OPERATE AUTO GROUND OVERCURRENT LOCKOUT.
THE RX WAS MANUALLY SCRAMMED ON DEGRADING CONDENSER VACUUM AFTER THE INSERVICE STEAM JET AIR EJECTOR WAS REMOVED FROM SERVICE DUE TO HIGH HYDROGEN OFFGAS CONCENTRATION. THE CAUSE WAS BLOCKED DRAIN LINES IN THE HATCH 1 02/08/02 321 2 3212002001 38686 OPERATE MAN OFFGAS SYSTEM.
A TURBINE TRIP/RX TRIP OCCURRED FOLLOWING THE LOSS OF A UNIT AUXILIARY TRANSFORMER. THE CAUSE WAS AN INTERNAL HATCH 1 03/28/01 321 2 3212001002 37869 OPERATE AUTO TRANSFORMER FAULT.
A RX SCRAM OCCURRED ON LOW RX WATER VESSEL WATER LEVEL.
THE INADVERTENT CLOSURE OF A HIGH PRESSURE FEEDWATER HEATER INLET VALVE ISOLATED ONE OF TWO FEEDWATER INLET LINES. THE CAUSE WAS ATTRIBUTED TO A FAILED VALVE CONTROL HATCH 1 01/26/00 321 2 3212000002 36625 OPERATE AUTO SWITCH.
A TURBINE TRIP/RX SCRAM RESULTED FROM AN INVALID TURBINE BEARING HIGH VIBRATION TRIP SIGNAL. THE TURBINE BEARING HATCH 1 07/10/00 321 2 3212000004 37155 OPERATE AUTO VIBRATION INSTRUMENT FAILED.
THE RX WAS MANUALLY SCRAMMED ON DECREASING RX WATER LEVEL FOLLOWING A LOW SUCTION PRESSURE TRIP OF THE OPERATING RX FEED PUMP. THE CAUSE WAS AIR INTRODUCED INTO THE CONDENSATE PUMP SUCTION HEADER THROUGH A LEAKING HATCH 1 09/29/00 321 2 3212000011 37390 OPERATE MAN PUMP SUCTION ISOLATION VALVE.
A MAIN GENERATOR RUNBACK OCCURRED DUE TO THE RECEIPT OF A MAIN GENERATOR HIGH TEMPERATURE SIGNAL. A HIGH REACTOR PRESSURE SCRAM OCCURRED DURING THE RUNBACK. THE CAUSE OF THE HIGH GENERATOR TEMPERATURE SIGNAL WAS IMPROPER SET-HATCH 2 06/20/09 366 2 3662009003 45145 OPERATE AUTO UP OF THE CONTROL INSTRUMENT.
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be r um n tN tio ep cr ip or n /D tR atio es E DA Even ifi se NA TE c OD Ca M DO CK ns tN E u PL EN ET ee ot M AM NO AN T RE Ev UN Sc T EV GI ON Lic en IT SC ram TE S
e R THE REACTOR AUTOMATICALLY TRIPPED FOLLOWING A MAIN TURBINE TRIP. THE TURBINE TRIPPED DUE TO HIGH REACTOR WATER LEVEL. THE CAUSE OF THE TRANSIENT WAS A FAILED CAPACITOR IN THE INTERNAL POWER SUPPLY OF THE REACTOR WATER LEVEL HATCH 2 06/23/09 366 2 3662009004 45148 OPERATE AUTO CONTROLLER.
THE REACTOR TRIPPED ON LOW REACTOR LEVEL FOLLOWING A LOSS OF FEEDWATER. THE FEEDWATER LOSS WAS CAUSED BY LOSS OF THE CONDENSATE DEMINERALIZERS CONTROL DUE TO A PERSONNEL HATCH 2 03/07/08 366 2 3662008002 44046 OPERATE AUTO ERROR DURING SOFTWARE TESTING.
THE REACTOR TRIPPED ON LOW REACTOR WATER LEVEL. THE CAUSE OF THE TRIP WAS A PARTIAL LOSS OF CONDENSATE CAUSED BY LOSS OF NON-VITAL 2D 4160V STATION SERVICE BUS. THE CAUSE OF THE BUS TRIP WAS DETERMINED TO BE INEFFECTIVE EXECUTION OF I&C HATCH 2 08/07/07 366 2 3662007008 43552 OPERATE AUTO RELAY CALIB.
A SCRAM OCCURRED ON A TURBINE CONTROL VALVE FAST CLOSURE RESULTING FROM A POWER LOAD IMBALANCE. THE LICENSEE IS HATCH 2 04/05/06 366 2 3662006002 42471 OPERATE AUTO INVESTIGATING THE CAUSE.
CONDENSER TUBE LEAK CAUSED BAD WATER CHEMISTRY. SHUTTING DOWN FROM 100%, MANUALLY SCRAMMED AT 57%. VOID COLLAPSE RESULTED IN GROUP 2 PCIS ISOLATION. LEVEL RECOVERED HATCH 2 05/23/05 366 2 3662005003 41725 OPERATE MAN WITH FEEDWATER PUMPS.
A SCRAM OCCURRED ON APRM HIGH FLUX FOLLOWING A RAPID INCREASE, AFTER AN UNEXPECTED DECREASE, IN RECIRCULATION PUMP FLOW. THE CAUSE WAS A FAILED AMPLIFIER BOARD IN THE HATCH 2 10/26/01 366 2 3662001002 38432 OPERATE AUTO SCOOP TUBE POSITIONER CIRCUIT.
A RX SCRAM OCCURRED ON HIGH NEUTRON FLUX FOLLOWING A RAPID PRESSURE INCREASE RESULTING FROM A SUDDEN MSIV HATCH 2 12/25/01 366 2 3662001003 38592 OPERATE AUTO CLOSURE. THE MSIV STEM FAILED FROM HIGH CYCLE FATIGUE.
A TURBINE TRIP/REACTOR SCRAM OCCURRED DUE TO A FALSE TURBINE MOISTURE SEPARATOR HIGH WATER LEVEL SIGNAL. THE FALSE SIGNAL WAS MOST LIKELY CAUSED BY A TURBINE TRIP SWITCH THE CAUSE OF THE SCRAM WAS DO TO A FALSE TURBINE BEING BUMPED BY PERSONNEL ERECTING A SCAFOLD IN THE SAME MOISTURE SEPARATOR HIGH WATER LEVEL SIGNAL, FORT CALHOUN 12/23/10 285 4 2852010006 46506 OPERATE AUTO GENERAL AREA. WHICH CAUSED A TURBINE TRIP.
WITH POWER REDUCED TO 85% BECAUSE OF A TURBINE CONTROL VALVE OSCILLATION PROBLEM, THE TURBINE CONTROL VALVES FORT CALHOUN 03/15/08 285 4 2852008001 44066 OPERATE AUTO WENT CLOSED AND CAUSED A SUBSEQUENT REACTOR TRIP. REACTOR TRIPPED ON TURBINE CONTROL VALVE CLOSURE.
A RX TRIP OCCURRED ON LOSS OF LOAD AFTER POWER ROSE RAPIDLY FROM 12 TO 16 PERCENT WITH ALL TURBINE STOP VALVES CLOSED AND TURBINE TESTING IN PROGRESS. THE CAUSE WAS A FEEDWATER TRANSIENT RESULTING FROM INADEQUATE PROCEDURES FOR LOW FORT CALHOUN 02/26/05 285 4 2852005001 41446 OPERATE AUTO POWER OPERATIONS.
THE RX WAS MANUALLY TRIPPED DUE TO UNANTICIPATED NEGATIVE AXIAL SHAPE INDEX THAT BEGAN TO APPROACH THE RPS TRIP THE TRIP HAD BEEN BRIEFED BUT WAS NOT PART OF ANY FORT CALHOUN 09/12/03 285 4 2852003003 40156 OPERATE MAN SETTINGS. WRITTEN PREPLANNED SEQUENCE.
THE REACTOR TRIPPED ON DECREASING REACTOR WATER LEVEL. THE DECREASING LEVEL WAS CAUSED BY A REACTOR FEED PUMP MIN FLOW VALVE FAILING OPEN DUE TO AN ERRONEOUS FLOW SIGNAL AND THE RFP TRIPPING DUE TO A SPEED DEMAND MIS-MATCH GRAND GULF 03/08/10 416 4 4162010001 45753 OPERATE AUTO CAUSED BY A LINKAGE BINDING.
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be r um n tN tio ep cr ip or n /D tR atio es E DA Even ifi se NA TE c OD Ca M DO CK ns tN E u PL EN ET ee ot M AM NO AN T RE Ev UN Sc T EV GI ON Lic en IT SC ram TE S
e R THE REACTOR WAS MANUALLY SCRAMMED DUE TO DEGRADED COOLING ON THE MAIN TRANSFORMERS. AN ELECTRICAL FAULT ON THE B PHASE POWER CABLE RESULTED IN LOSS OF TRANSFORMER GRAND GULF 01/12/08 416 4 4162008001 43899 OPERATE MAN COOLING SYSTEM.
THE REACTOR TRIPPED FOLLOWING A TURBINE STOP AND CONTROL VALVE FAST CLOSURE. THE PROBABLE CAUSE WAS A C PHASE GRAND GULF 03/21/08 416 4 4162008002 44086 OPERATE AUTO DIFFERENTIAL TRIP OF THE MAIN TRANSFORMER.
A TURBINE TRIP AND SUBSEQUENT REACTOR TRIP OCCURRED FOLLOWING A TURBINE CONTROL VAVE FAST CLOSURE. THE FAST CLOSURE WAS CAUSED BY FAILURE OF THE MAIN GENERATOR GRAND GULF 10/26/08 416 4 4162008005 44601 OPERATE AUTO VOLTAGE REGULATOR.
A REACTOR FEED PUMP SPEED DECREASED TO ZERO RESULTING IN A REACTOR TRIP ON LOW REACTOR LEVEL. THE CAUSE OF THE FEEDWATER FLOW LOSS WAS ACCIDENTAL ISOLATION OF THE STEAM GRAND GULF 10/23/08 416 4 4162008004 44595 OPERATE AUTO INLET VALVES BY AN OPERATOR.
THE REACTOR TRIPPED DUE TO A TURBINE TRIP CAUSED BY LOSS OF CONDENSER VACUUM. THE LOSS OF VACUUM WAS FROM LEAKS IN GRAND GULF 05/19/07 416 4 4162007002 43376 OPERATE AUTO THE HIGH PRESSURE CONDENSER EXPANSION JOINT.
WITH THE IC TECH GROUP WORKING IN A FEEDWATER CONTROL PANEL, THE "A" FEEDWATER PUMP CONTROLLER FAILED DOWNSCALE, RESULTING IN A LOW REACTOR LEVEL SCRAM. NO GRAND GULF 08/21/07 416 4 4162007003 43584 OPERATE AUTO DEFINITVE CAUSE HAS BEEN DETERMINED.
A RX SCRAM OCCURRED ON LOW RX WATER LEVEL FOLLOWING A LOSS OF FEEDWATER. A PARTIAL LOSS OF OFFSITE POWER OCCURRED WHEN A RACOON SHORTED TWO PHASES OF A SERVICE TRANSFORMER. THE CAUSE WAS AN ANIMAL INTRUSION FENCE GRAND GULF 02/11/05 416 4 4162005001 41405 OPERATE AUTO THAT HAD BEEN LEFT DEENERGIZED.
THE RX WAS MANUALLY SCRAMMED ON DECREASING VESSEL WATER LEVEL FOLLOWING A LOSS OF FEED. THE CAUSE WAS AN ELECTRICAL SHORT DURING MAINTENANCE WHICH RESULTED IN ISOLATION OF ALL OPERATING CONDENSATE DEMINERALIZERS AND THE LOSS OF GRAND GULF 01/30/03 416 4 4162003001 39548 OPERATE MAN FEED.
A TURBINE TRIP/RX SCRAM OCCURRED ON A LOSS OF LOAD FOLLOWING A PARTIAL LOSS OF OFFSITE POWER. THE CAUSE WAS A GRAND GULF 04/24/03 416 4 4162003002 39793 OPERATE AUTO SWITCHYARD FAULT FROM HIGH WINDS.
A SCRAM OCCURRED ON A TURBINE CONTROL VALVE FAST CLOSURE FOLLOWING A GROUND FAULT ON THE SECONDARY SIDE OF A SERVICE TRANSFORMER. THE CAUSE WAS A RACCOON BRIDGING THE GRAND GULF 06/22/02 416 4 4162002003 39012 OPERATE AUTO 34.5 KV PHASE "B" TO A GROUNDED STANCHION.
A TURBINE TRIP/SCRAM OCCURRED AS THE RESULT OF A GENERATOR LOAD TRANSIENT. THE CAUSE WAS THE FAILURE OF A 500 KV GRAND GULF 08/07/01 416 4 4162001003 38189 OPERATE AUTO DISCONNECT IN AN OFFSITE SWITCHYARD. AN SSF WAS ALSO CODED FOR THIS EVENT (EOC-RPT).
A RX SCRAM OCCURRED ON A TURBINE CONTROL VALVE FAST CLOSURE SIGNAL. THE SIGNAL RESULTED FROM A GENERATOR LOAD TRANSIENT CAUSED BY THE FAILURE OF A 500 KV CIRCUIT BREAKER GRAND GULF 09/15/00 416 4 4162000005 37325 OPERATE AUTO IN AN OFFSITE SWITCHYARD.
LOSS OF 4KV BUS 5 DUE TO A FIRE RESULTED IN LOSS OF REACTOR COOLANT SYSTEM PUMP B AND A SUBSEQUENT REACTOR AND TURBINE TRIP. THE INITIAL FAULT WAS CAUSED BY THE FAILURE OF A ROBINSON 2 03/28/10 261 2 2612010002 45799 OPERATE AUTO FEEDER CABLE SUPPLYING 4KV BUS 5.
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e R THE REACTOR TRIPPED FOLLOWING THE RECEIPT OF AN "OVERTEMPERATURE DELTA-T" SIGNAL. THE CAUSE OF THE OVERTEMPERATURE SIGNAL WAS FAILURE OF THE TURBINE ELECTRO-HYDRAULIC CONTROL SYSTEM, WHICH CAUSED THE FOUR TURBINE THE REACTOR TRIPPED ON AN OVERTEMPERATURE DELTA-ROBINSON 2 09/09/10 261 2 2612010007 46238 OPERATE AUTO GOVERNOR VALVES TO CLOSE. T SIGNAL.
THE REACTOR TRIPPED WHEN A MOTOR FAULT OCCURRED ON A REACTOR COOLANT PUMP CAUSING A SINGLE LOOP LOW FLOW TRIP.
THE ROOT CAUSE OF THIS EVENT WAS INADEQUATE END WINDING ROBINSON 2 10/07/10 261 2 2612010009 46313 OPERATE AUTO BRACING ON THE "C" RCP.
THE REACTOR WAS MANUALLY TRIPPED DUE TO CLOSURE OF A MAIN FEEDWATER REGULATING VALVE. THE CLOSURE WAS CAUSED BY THE ROBINSON 2 11/06/09 261 2 2612009003 45483 OPERATE MAN FAILURE THE FLOW ERROR SIGNAL SUMMATOR POWER SUPPLY.
WHILE LOWERING POWER DUE TO INCREASED MAIN-TURBINE VIBRATIONS, THE REACTOR WAS MANUALLY TRIPPED AT 78%
POWER, WHEN BEARING VIBRATIONS REACHED THE TRIP CRITERION.
MULTIPLE PROBABLE CAUSES FOR THE VIBRATIONS WERE ROBINSON 2 11/17/08 261 2 2612008002 44660 OPERATE MAN IDENTIFIED.
THE REACTOR TRIPPED DUE TO A TURBINE TRIP. THE CAUSE OF THE TURBINE TRIP WAS THE GENERATOR DIFFERENTIAL PROTECTION ROBINSON 2 05/15/07 261 2 2612007001 43364 OPERATE AUTO CIRCUITRY.
THE REACTOR WAS MANUALLY TRIPPED WHEN THE OPERATORS ROBINSON 2 10/25/06 261 2 2612006001 42933 OPERATE MAN OBSERVED INDICATIONS OF A 100% LOAD REJECTION.
THE RX WAS MANUALLY TRIPPED DUE TO AN UNISOLABLE EHC SYSTEM OIL LEAK. THE TUBING FAILURE WAS CAUSED BY CORROSION FATIGUE INITIATED AT A DEFECT ON THE OUTER DIAMETER SURFACE ROBINSON 2 06/21/00 261 2 2612000001 37098 OPERATE MAN OF THE TUBE.
THE REACTOR WAS MANUALLY SCRAMMED DUE TO FAILURE OF THE TURBINE AUXILARY COOLING SYSTEM. THE CAUSE OF THE LOSS WAS FAILURE OF A SOLENOID VALVE ON THE TACS SUPPLY ISOLATION HOPE CREEK 01/17/09 354 1 3542009001 44784 OPERATE MAN VALVES.
THE REACTOR AUTOMATICALLY TRIPPED ON THE REACTOR VESSEL LEVEL TWO SECONDS PRIOR TO THE MODE SWITCH BEING PLACED IN SHUTDOWN DUE TO MULTIPLE CONTROL RODS DRIFTING. THE CONTROL RODS WERE DRIFTING DUE TO AN AIR LEAK IN A HOPE CREEK 05/17/09 354 1 3542009004 45074 OPERATE AUTO HYDRAULIC CONTROL UNIT.
AN AUTOMATIC SCRAM OCCURRED DUE TO LOW REACTOR WATER LEVEL. THE LOW LEVEL WAS CAUSED BY THE REACTOR FEED PUMP MINIMUM FLOW RECIRCULATION VALVE OPENING IN RESPONSE TO HOPE CREEK 01/29/07 354 1 3542007001 43132 OPERATE AUTO A FAILED INSTRUMENT TAP WELD.
AN ELECTRICAL TRANSIENT RESULTED IN LOSS OF THE REACTOR FEED PUMPS. THE REACTOR WAS MANUALLY TRIPPED DUE TO LOWERING HOPE CREEK 05/29/07 354 1 3542007002 43395 OPERATE MAN REACTOR LEVEL.
THE RX WAS MANUALLY SCRAMMED WHEN DRYWELL FLOOR DRAIN LEAKAGE INCREASED TO GREATER THAN 10 GPM. THE CAUSE WAS A 285 DEGREE CIRCUMFERENTIAL CRACK IN THE POSITION INDICATING HOPE CREEK 06/07/05 354 1 3542005003 41753 OPERATE MAN TUBE FOR THE RHR CHECK VALVE.
THE RX WAS MANUALLY SCRAMMED WHEN TWO INBOARD MSIVS WERE OBSERVED DRIFTING CLOSED FROM A LOSS OF PNEUMATIC PRESSURE AS A RESULT OF AN INVALID CONTAINMENT ISOLATION SIGNAL. THE CAUSE WAS A LOOSE RADIATION MONITOR ELECTRICAL HOPE CREEK 01/12/04 354 1 3542004001 40437 OPERATE MAN CONTACT.
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e R THE RX WAS MANUALLY SCRAMMED DUE TO A STEAM LEAK IN THE TURBINE BUILDING. THE CAUSE WAS FAILURE OF A MOISTURE HOPE CREEK 10/10/04 354 1 3542004010 41109 OPERATE MAN SEPARATOR DUMP LINE TO THE CONDDENSER.
A RX SCRAM OCCURRED ON LOW RX WATER LEVEL FOLLOWING A PARTIAL LOSS OF OFFSITE POWER AND THE LOSS OF TWO OF THREE RFP'S. THE CAUSE WAS SALT DEPOSITS IN THE SWITCHYARD HOPE CREEK 09/19/03 354 1 3542003007 40185 OPERATE AUTO RESULTING IN A FLASH-OVER OF A 500 KV INSULATOR.
THE RX WAS MANUALLY SCRAMMED DUE TO AN EHC SYSTEM OIL LEAK ASSOCIATED WITH A COMBINED INTERMEDIATE CONTROL VALVE. THE VALVE WAS NOT PROPERLY REASSEMBLED FOLLOWNG HOPE CREEK 10/04/03 354 1 3542003008 40224 OPERATE MAN MAINTENANCE.
A RX SCRAM/TURBINE TRIP OCCURRED ON HIGH MOISTURE SEPARATOR LEVEL THAT RESULTED FROM THE TRIP OF A SECONDARY CONDENSATE PUMP AND INTERMEDIATE RUNBACK OF THE RX RECIRCULATION PUMPS. A FAILED LOGIC CARD CAUSED THE HOPE CREEK 06/22/02 354 1 3542002004 39010 OPERATE AUTO CONDENSATE PUMP TRIP.
THE REACTOR TRIPPED FOLLOWING A MAIN GENERATOR TRIP. THE MAIN GENERATOR TRIP WAS DUE TO LOSS OF EXCITATION CAUSED BY A SERIES OF PERSONNEL ERRORS WHEN ISOLATING ONE OF THE INDIAN POINT 2 01/11/10 247 1 2472010001 45624 OPERATE AUTO RECTIFIERS FOR MAINTENANCE.
WHILE REDUCING POWER FOR SHUTDOWN, THE REACTOR AUTOMATICALLY SCRAMMED FOLLOWING A TURBINE TRIP DUE TO HIGH STEAM GENERATOR LEVEL. THE ROOT CAUSE OF THE TRIP WAS INADEQUATE DESIGN CONTROL OF THE SETTINGS OF CRITICAL PLANT INDIAN POINT 2 09/03/10 247 1 2472010007 46229 OPERATE AUTO CONTROLLERS.
AN EXPLOSION IN THE 21 MAIN TRANSFORMER RESULTED IN A TURBINE TRIP AND REACTOR TRIP. THE EXPLOSION WAS CAUSED BY A LOW IMPEDANCE GROUND FAULT ON THE TRANSFORMER PHASE B INDIAN POINT 2 11/07/10 247 1 2472010009 46400 OPERATE AUTO BUSHING.
THE REACTOR WAS MANUALLY TRIPPED FROM 100% POWER FOLLOWING THE LOSS OF A MAIN BOILER FEED PUMP. FOLLOWING THE MBFP TRIP, THE TURBINE RUNBACK CIRCUIT DID NOT ACTUATE AS EXPECTED. THE MBFP FAILED DUE TO A TUBING FAILURE IN THE INDIAN POINT 2 04/03/09 247 1 2472009002 44967 OPERATE MAN AUTOSTOP OIL TUBING.
THE REACTOR TRIPPED FOLLOWING A MAIN TURBINE TRIP. THE TURBINE TRIPPED DUE TO A GENERATOR LOCKOUT RELAY ACTUATION. THE LOCKOUT RELAY ACTUATION WAS DUE TO A HIGH INDIAN POINT 2 11/02/09 247 1 2472009005 45474 OPERATE AUTO RESISTANCE GROUND ON THE POWER SUPPLY.
THE REACTOR WAS MANUALLY TRIPPED DUE TO LOSS OF SPEED CONTROL ON A MAIN BOILER FEED PUMP RESULTED IN LOWERING INDIAN POINT 2 03/23/08 247 1 2472008001 44089 OPERATE MAN STEAM GENERATOR LEVELS.
WHILE ASCENDING POWER AT 37%, A MAIN TURBINE RUNBACK RESULTED IN DECREASING STEAM GENERATOR LEVELS. THE OPERATOR MANUALLY TRIPPED THE REACTOR. THE CAUSE OF THE MAIN TURBINE RUNBACK WAS A FAILED BISTABLE IN THE RUNBACK INDIAN POINT 2 04/21/08 247 1 2472008003 44153 OPERATE MAN CIRCUIT.
THE REACTOR WAS MANUALLY SCRAMMED ON LOWERING STEAM GENERATOR LEVELS. A FAILED PRESSURE TRANSMITTER IN THE COMMON MAIN FEEDWATER SUPPLY HEADER CAUSED A CUTBACK OF BOTH MAIN FEEDWATER PUMPS, RESULTING IN DECREASING INDIAN POINT 2 02/28/07 247 1 2472007004 43199 OPERATE MAN STEAM GENERATOR LEVELS.
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e R THE RX WAS MANUALLY TRIPPED ON INDICATION OF TWELVE DROPPED RODS. A MANUAL DISCONNECT SWITCH FOR THE RODS POWER SUPPLY WAS INADVERTENTLY OPENED DURING AREA INDIAN POINT 2 03/01/06 247 1 2472006001 42378 OPERATE MAN SCAFFOLD WORK.
THE REACTOR WAS MANUALLY TRIPPED AT 68% WHILE REDUCING POWER FROM 100% DUE TO PRIMAARY POWER AND SECONDARY LOAD MISMATCH. THE EVENT WAS INITIATED WHEN HEATER DRAIN TANK PUMPS 21 AND 22 TRIPPED DUE TO FAILURE OF THE INDIAN POINT 2 08/23/06 247 1 2472006003 42797 OPERATE MAN AUTOMATIC HEATER DRAIN LEVEL CONTROL.
WHILE TROUBLESHOOTING THE MAIN GENERATOR EXCITER POWER SUPPLY, AN ELECTRICAL SPIKE RESULTED IN A TURBINE TRIP, WHICH INDIAN POINT 2 11/15/06 247 1 2472006005 42993 OPERATE AUTO CAUSED A REACTOR SCRAM.
THE RX WAS MANUALLY TRIPPED ON DEGRADING FEEDWATER FLOW AND SG LEVEL CONDITIONS AFTER A FEEDWATER REGULATING VALVE BEGAN OPERATING ERRATICALLY. THE CAUSE OF THE VALVE FAILURE WAS THE VALVE CAGE BECAME LOOSE DUE TO INADEQUATE INDIAN POINT 2 09/01/04 247 1 2472004001 41003 OPERATE MAN MAINTENANCE PROCEDURE GUIDE.
THE RX WAS MANUALLY TRIPPED ON DEGRADING FW FLOW AND SG WATER LEVEL AFTER A MAIN FW REGULATING VALVE FAILED SHUT.
THE CAUSE WAS DISCONNECTED WIRING FROM THE VALVES INDIAN POINT 2 09/24/04 247 1 2472004002 41066 OPERATE MAN SOLENOID OPERATOR DUE TO IMPROPER SOLENOID ORIENTATION.
A RX/TURBINE TRIP OCCURRED FOLLOWING A LOSS OF STATOR WATER COOLING. THE CAUSE WAS AN INCORRECT PRESSURE SWITCH SETTING RESULTING FROM INADEQUATE PROCEDURES AND INDIAN POINT 2 11/26/04 247 1 2472004005 41227 OPERATE AUTO INADEQUATE TESTING FOLLOWING EXTENSIVE MODIFICATIONS.
A TURBINE/RX TRIP OCCURRED DURING A PARTIAL LOSS OF OFFSITE ALL 3 EDGS STARTED AND THE NONSAFETY BUSES 2A AND POWER AFTER OUTPUT BREAKER "9" OPENED. THE CAUSE WAS A 3A WERE MANUALLY ENERGIZED BY EDG 22. THE SAFETY GRID DISTURBANCE FOLLOWED BY A SWITCHYARD RELAY BUSES 5A AND 6A REMAINED ENERGIZED FROM OFFSITE INDIAN POINT 2 04/28/03 247 1 2472003003 39804 OPERATE AUTO MALFUNCTION. SOURCES.
A TURBINE/RX TRIP OCCURRED DURING A LOSS OF ALL LOAD DUE TO AN OFFSITE ELECTRICAL DISTURBANCE INITIATED BY A LIGHTNING INDIAN POINT 2 08/03/03 247 1 2472003004 40045 OPERATE AUTO STRIKE.
A RX SCRAM OCCURRED ON LOW RX COOLANT LOOP FLOW FOLLOWING A LOSS OF OFFSITE POWER. THE CAUSE WAS A MAJOR INDIAN POINT 2 08/14/03 247 1 2472003005 40067 OPERATE AUTO GRID DISTURBANCE AND BLACKOUT.
A TURBINE/RX TRIP OCCURRED ON A LOSS OF LOAD. THE CAUSE WAS FAILURE OF AN OFFSITE BLOCKING RELAY AND RESULTING GRID DISTURBANCE ON THE NORTH 345 KV RING BUS AT THE BUCHANAN INDIAN POINT 2 12/26/01 247 1 2472001007 38593 OPERATE AUTO SWITCHYARD.
THE RX WAS MANUALLY TRIPPED FOLLOWING A SG TUBE RUPTURE.
INDIAN POINT 2 02/15/00 247 1 2472000001 36695 OPERATE MAN THE FAULTED SG WAS ISOLATED.
THE REACTOR WAS MANUALLY TRIPPED FOLLOWING INDICATION OF INDIAN POINT 3 09/09/10 286 1 2862010002 46241 OPERATE MAN A SERVICE WATER LEAK IN THE MAIN GENERATOR EXCITER HOUSING.
THE REACTOR WAS MANUALLY TRIPPED WHEN A MAIN FEED REGULATING VALVE FAILED OPEN AND COULD NOT BE CORRECTED.
THE LOSS OF FEED REG VALVE CONTROL WAS CAUSED BY A DISCONNECTED VALVE POSITION FEEDBACK LINK THAT FAILED DUE INDIAN POINT 3 05/15/09 286 1 2862009003 45069 OPERATE MAN TO AN INADEQUATE MAINTENANCE PROCEDURE 29
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e R WHILE LOWERING POWER DUE TO EXCESSIVE FEEDWATER PUMP VIBRATIONS, A TURBINE TRIP AND SUBSEQUENT REACTOR TRIP OCCURRED DUE TO HIGH LEVEL IN A STEAM GENERATOR. THE CAUSE OF THE STEAM GENERATOR LEVEL EXCURSION WAS DUE TO A FWRV INDIAN POINT 3 05/28/09 286 1 2862009004 45098 OPERATE AUTO CONTROLLER SATURATION.
THE REACTOR TRIPPED FOLLOWING A TURBINE TRIP DURING A THUNDERSTORM. THE CAUSE OF THE TURBINE TRIP WAS ACTUATION INDIAN POINT 3 08/10/09 286 1 2862009006 45255 OPERATE AUTO OF THE GENERATOR PROTECTION PRIMARY LOCKOUT RELAY.
THE REACTOR TRIPPED FOLLOWING A TURBINE TRIP. THE CAUSE OF THE TURBINE TRIP WAS LOSS OF TURBINE AUTOSTOP OIL PRESSURE.
THE LOSS OF OIL WAS CAUSED BY A FAILED FITTING IN THE LINE CONNECTING THE AUTOSTOP OIL TO THE TURBINE TRIP SOLENIOD INDIAN POINT 3 08/27/09 286 1 2862009007 45306 OPERATE AUTO TRIP DEVICE.
THE REACTOR WAS MANUALLY TRIPPED DURING BOILER FEED PUMP MAINTENANCE WHEN LOW STEAM GENERATOR LEVELS OCCURRED.
WITH ONE PUMP DEENERGIZED FOR MAINTENANCE, THE LOGIC CONTROL FOR THE RUNNING PUMP FAILED DUE TO A LOGIC POWER INDIAN POINT 3 04/03/07 286 1 2862007001 43272 OPERATE MAN SUPPLY FAILURE.
AN EXPLOSION AND FIRE IN THE MAIN TRANSFORMER RESULTED IN A LOAD REJECTION OF THE MAIN GENERATOR AND A REACTOR TRIP.
THIS EVENT WAS CAUSED BY A FAULT IN THE TRANSFORMER'S 345KV INDIAN POINT 3 04/06/07 286 1 2862007002 43285 OPERATE AUTO PHASE B BUSHING.
A RX TRIP OCCURRED ON GENERATOR PHASE 'B' DIFFERENTIAL CURRENT. THE EVENT WAS CAUSED BY A SHORT CIRCUIT IN A MAIN INDIAN POINT 3 07/06/06 286 1 2862006001 42687 OPERATE AUTO GENERATOR JUNCTION BOX.
SCAFFOLDING ERECTED IN THE VICINITY OF THE MAIN TURBINE GENERATOR CAUSED ARCING FROM THE GENERATOR PHASES A&B.
THIS RESULTED IN THE OPERATOR MANUALLY TRIPPING THE INDIAN POINT 3 07/21/06 286 1 2862006002 42720 OPERATE MAN REACTOR.
A RX TRIP OCCURRED ON A STEAM FLOW/FEED FLOW MISMATCH SIGNAL WHEN THE CONDENSATE POLISHER POST FILTER BYPASS VALVE CLOSED DURING TROUBLESHOOTING ACTIVITIES. THE CAUSE INDIAN POINT 3 05/06/05 286 1 2862005002 41673 OPERATE AUTO WAS A MISPOSITIONED SWITCH.
THE RX WAS MANUALLY TRIPPED DUE TO A SERVICE WATER LEAK IN THE MAIN GENERATOR EXCITER. THE CAUSE WAS A SPLIT GASKET ON INDIAN POINT 3 06/10/05 286 1 2862005004 41762 OPERATE MAN THE EXCITER COOLER DUE TO OVERTIGHTENED BOLTS.
THE RX WAS MANUALLY TRIPPED ON HIGH DIFFERENTIAL PRESSURE BETWEEN CONDENSER SECTIONS FOLLOWING THE LOSS OF BOTH CIRC WATER PUMPS IN ONE CONDENSER SECTION. ONE PUMP WAS OUT OF SERVICE FOR MAINTENANCE WHEN THE OTHER TRIPPED INDIAN POINT 3 01/13/03 286 1 2862003001 39506 OPERATE MAN FROM A SHORTED DC EXCITER LEAD.
THE RX WAS MANUALLY TRIPPED DUE TO A CLASS B FIRE AT THE SOUTH END OF THE HIGH PRESSURE TURBINE. THE CAUSE WAS HEAT OF THE TURBINE CASING IGNITING LUBE OIL THAT HAD LEAKED AND INDIAN POINT 3 04/29/03 286 1 2862003002 39808 OPERATE MAN SOAKED TURBINE INSULATING PADS.
A TURBINE/RX TRIP OCCURRED AFTER A GENERATOR TRIP. A FAULT OCCURRED WHILE ATTEMPTING TO CLOSE THE 345 KV CIRCUIT BREAKER NUMBER THREE FOLLOWING MAINTENANCE. THE CAUSE WAS MOISTURE OR CONTAMINATION COMPROMISED THE BREAKER INDIAN POINT 3 06/22/03 286 1 2862003003 39955 OPERATE AUTO DIELECTRIC GAS.
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e R A RX TRIP OCCURRED ON LOW RCS FLOW FOLLOWING A LOSS OF OFFSITE POWER. THE CAUSE WAS A MAJOR GRID DISTURBANCE AND INDIAN POINT 3 08/14/03 286 1 2862003005 40069 OPERATE AUTO BLACKOUT.
A RX TRIP OCCURRED ON A GENERATOR LOCKOUT AFTER A 345 KV MAIN OUTPUT BREAKER FAILED OPEN. THE BREAKER CATASTROPHICALLY FAILED DUE TO HIGH CONTACT RESISTANCE INDIAN POINT 3 11/15/02 286 1 2862002003 39375 OPERATE AUTO CAUSED BY MISALIGNMENT FROM POOR VENDOR WORKMANSHIP.
A RX TRIP OCCURRED ON A LOW SG WATER LEVEL FOLLOWING A FEEDWATER TRANSIENT AND TURBINE TRIP. A LICENSED OPERATOR FAILED TO PROPERLY CONTROL FEEDWATER PUMP SPEED WHILE DIRECTING AN OPERATOR TRAINEE WHO WAS CONTROLLING THE INDIAN POINT 3 06/04/00 286 1 2862000007 37054 OPERATE AUTO FEEDWATER REGULATING VALVES.
A TURBINE TRIP/RX TRIP OCCURRED FOLLOWING A MAIN GENERATOR TRIP AND LOCKOUT. THE CAUSE WAS LOW INSULATION RESISTANCE BETWEEN SEVERAL CONDUCTORS IN A CABLE ROUTED INDIAN POINT 3 06/09/00 286 1 2862000008 37071 OPERATE AUTO BETWEEN THE SITE AND THE BUCHANAN SUBSTATION.
HIGH WINDS RESULTED IN DEBRIS CAUSING LOWERING INTAKE CANAL LEVEL DUE TO PLUGGING OF THE TRAVELING SCREENS AND TRASH BASKETS. THE OPERATOR BEGAN A RAPID POWER REDUCTION. THE REACTOR WAS MANUALLY TRIPPED WHEN THE FITZPATRICK 09/12/07 333 1 3332007002 43635 OPERATE MAN INTAKE LEVEL DROPPED TO 240 FEET.
THE REACTOR WAS MANUALLY SCRAMMED WHEN THE TRAVELING FITZPATRICK 10/28/07 333 1 3332007002 43752 OPERATE MAN WATER SCREENS BECAME BLOCKED WITH DEBRIS.
A SCRAM OCCURRED ON LOW RX VESSEL LEVEL FOLLOWING A MOMENTARY LOSS OF UPS AND RESULTING LOCKOUT OF THE RX FEED PUMP CONTROLS. THE CAUSE WAS OPERATOR ERROR RESPONDING TO THE TRANSIENT WITH CONTRIBUTION FROM AN FITZPATRICK 09/14/05 333 1 3332005005 41987 OPERATE AUTO INADEQUATE ABNORMAL OPERATING PROCEDURE.
A RX SCRAM OCCURRED ON A TURBINE CONTROL VALVE FAST CLOSURE. THE CAUSE WAS A MAJOR GRID DISTURBANCE AND FITZPATRICK 08/14/03 333 1 3332003001 40072 OPERATE AUTO BLACKOUT.
A RX SCRAM OCCURRED ON A MANUAL TURBINE TRIP DUE TO DECREASING CONDENSER VACUUM. DURING RECOMBINER MAINTENANCE, THE BYPASS VALVE FAILED CLOSED, ISOLATING THE OFF GAS SYSTEM. THE CAUSE WAS AN AGE-RELATED FAILURE OF THE FITZPATRICK 04/01/00 333 1 3332000003 36853 OPERATE AUTO ASSOCIATED SOLENOID OPERATED VALVE.
THE REACTOR TRIPPED FROM 100% POWER. A FAULT IN THE SWITCHYARD RESULTED IN A VOLTAGE DROP THAT CAUSED A LOSS OF BREAKER POSITION INDICATION. THIS RESULTED IN THE REACTOR TRIPPING ON AN RCP BREAKER OPEN SIGNAL, EVEN THOUGH THE FARLEY 1 11/19/08 348 2 3482008004 44666 OPERATE AUTO BREAKER DID NOT OPEN.
A TURBINE/RX TRIP OCCURRED ON HIGH SG WATER LEVEL FOLLOWING A FEED SYSTEM TRANSIENT. THE LEAD LAG CARD IN THE SG FEEDWATER PUMP MASTER SPEED CONTROL CIRCUIT FAILED, FARLEY 1 03/01/04 348 2 3482004001 40558 OPERATE AUTO CAUSING A RAMP INCREASE IN THE SPEED OF BOTH SG FEED PUMPS.
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e R A RX TRIP OCCURRED ON INDICATED LOSS OF RCS FLOW WHEN THE "B" RCP BUS UNDERVOLTAGE RELAYS DROPPED OUT DUE TO A SHORTED POWER LEAD AND THE "A" RCP BUS UNDERVOLTAGE RELAYS WERE TRIPPED FOR TESTING. THE POWER LEAD WAS FARLEY 1 05/03/02 348 2 3482002001 38895 OPERATE AUTO INADVERTENTLY SHORTED DURING REPAIR.
THE RX WAS MANUALLY TRIPPED WHEN A ROD DROPPED 24 STEPS.
THE CAUSE WAS AN OPEN FAILURE OF THE MOVABLE GRIPPER COIL AFW AUTO STARTED IN RESPONSE TO THE FEED PUMPS FARLEY 1 10/15/02 348 2 3482002002 39291 OPERATE MAN BLOCKING DIODE. TRIP.
THE RX WAS MANUALLY TRIPPED ON DECREASING SG WATER LEVEL AFTER ALL MAIN FEEDWATER PUMP CONTROL VALVES CLOSED. THE CAUSE WAS A LOSS OF CONTROL POWER TO THE FEEDWATER PUMPS FROM UNINTENTIONAL SWITCH CONTACT BY PLANT FACILITIES FARLEY 1 12/10/02 348 2 3482002004 39433 OPERATE MAN PERSONNEL.
A RX TRIP OCCURRED ON LOW SG LVL. DURING A TURBINE BALANCING EVOLUTION, EHC PRESSURE DROPPED BELOW THAT REQUIRED FOR MFP OPERATION. SG LVL WAS STABILIZED WITH AUX FEED PUMPS. HOWEVER, THE STEAM DUMPS CLOSED AND SG LVL FARLEY 1 05/28/00 348 2 3482000006 37041 OPERATE AUTO SHRANK BELOW THE RX TRIP SETPOINT.
THE REACTOR WAS MANUALLY TRIPPED ON LOWERING STEAM GENERATOR LEVEL WHEN POWER AND CONTROL TO A FEED REG VALVE WAS LOST. THE CAUSE OF THE FAILURE WAS FAILURE OF A CONTROLLER DRIVER CARD IN THE FEED REG VALVE CONTROLLER FARLEY 2 05/22/10 364 2 3642010002 45946 OPERATE MAN CIRCUIT.
THE REACTOR TRIPPED DUE TO LOSS OF A REACTOR COOLANT PUMP BREAKER INDICATION. THE NON-VITAL BUS WAS LOST DUE TO THE STARTUP TRANSFORMER TRIPPING. UNIT 1 WAS PERFORMING RELAY FARLEY 2 10/03/07 364 2 3642007001 43687 OPERATE AUTO TESTING AT THE TIME.
A RX TRIP OCCURRED ON A SOURCE RANGE HIGH FLUX SIGNAL RESULTING FROM THE INTERMITTENT FAILURE OF A UNIVERSAL LOGIC CARD IN THE "B" TRAIN SOLID STATE PROTECTION SYSTEM.
THE CAUSE WAS NOT DISCOVERED UNTIL A SECOND TRIP OCCURRED FARLEY 2 04/11/04 364 2 3642004004 40666 STARTUP AUTO ON 4/12/04.
A RX TRIP OCCURRED ON AN INVALID SOURCE RANGE HIGH FLUX TRIP SIGNAL DURING LOW POWER PHYSICS TESTING. THE CAUSE WAS THE INTERMITTENT FAILURE OF A UNIVERSAL LOGIC CARD IN FARLEY 2 04/12/04 364 2 3642004004 40667 STARTUP AUTO THE "B" TRAIN SSPS. THIS IS THE SECOND OF TWO SIMILAR EVENTS.
A RX TRIP OCCURRED ON AN INDICATED (NOT ACTUAL) RCP BREAKER OPEN POSITION SIGNAL. ALL THREE RCPS REMAINED RUNNING. THE CAUSE WAS A MOMENTARY LOSS OF VOLTAGE ON THE "2A" 120 VAC FARLEY 2 11/10/03 364 2 3642003001 40309 OPERATE AUTO VITAL INSTRUMENT BUS INVERTER.
A TURBINE/RX TRIP RESULTED FROM A MAIN GENERATOR OVERCURRENT TRIP. THE GENERATOR NEUTRAL TRANSFORMER ELECTRICAL CONNECTION BOLT HAD BEEN OVERTORQUED AND SUBSEQUENTLY FAILED. THE CAUSE WAS A COMBINATION OF FARLEY 2 06/23/01 364 2 3642001001 38089 OPERATE AUTO PERSONNEL ERROR AND INADEQUATE PROCEDURE.
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e R A TURBINE/RX TRIP OCCURRED WHEN THE TURBINE LATCH PUSH BUTTON WAS DEPRESSED AND RELEASED DURING REPLACEMENT.
THE LATCH MECHANISM OVER TRAVELED PAST THE NEUTRAL POSITION TO THE TRIP POSITION. THE CAUSE WAS AN EQUIPMENT FARLEY 2 06/26/01 364 2 3642001002 38095 OPERATE AUTO DEFICIENCY IN THE LATCH MECHANISM.
A TURBINE/RX TRIP OCCURRED ON HIGH SG LEVEL DURING A FEEDWATER TRANSIENT. THE TRANSIENT WAS INITIATED BY A FAILED FWP SPEED CONTROL CIRCUIT. AN OPERATOR TOOK MANUAL CONTROL OF MFPS, BUT DUE TO SLUGGISH FRV RESPONSE, ONE SG FARLEY 2 11/16/00 364 2 3642000004 37527 OPERATE AUTO WAS SUBSEQUENTLY OVERFED.
WHILE PERFORMING MONTHLY TURBINE TRIP MECHANISM TESTING, THE TURBINE TRIPPED RESULTING IN A REACTOR SCRAM. THE CAUSE OF THE TURBINE TRIP WAS LOSS OF AUTO STOP OIL PRESSURE TO KEWAUNEE 01/12/07 305 3 3052007001 43096 OPERATE AUTO THE INTERFACE VALVE.
A REACTOR TRIP OCCURRED DURING SURVEILLANCE A REACTOR TRIP OCCURRED DURING SURVEILLANCE TESTING OF THE TESTING OF THE NUCLEAR POWER RANGE INSTRUMENTS.
NUCLEAR POWER RANGE INSTRUMENTS. THE TRIP WAS CAUSED BY THE TRIP WAS CAUSED BY A FAILED RELAY CONTACT IN FAILED RELAY CONTACTS IN THE RPS MATRIX ASSOCIATED WITH THE THE RPS MATRIX ASSOCIATED WITH NUCLEAR KEWAUNEE 02/27/07 305 3 3052007004 43196 OPERATE AUTO NUCLEAR INSTRUMENTATION. INSTRUMENTATION.
THE RX WAS MANUALLY TRIPPED AFTER THE ONLY OPERATING FEEDWATER PUMP TRIPPED AND AN AUTOMATIC TURBINE TRIP DID NOT OCCURR AS EXPECTED. AN ERRONEOUS PUMP RUNNING INPUT KEWAUNEE 04/26/06 305 3 3052006001 42530 OPERATE MAN WAS THE CAUSE.
LOSS OF INSTRUMENT BUS 1 DURING MAINTENANCE RESULTED IN AN AUTOMATIC REACTOR TRIP SIGNAL ON STEAM FLOW/FEED FLOW MISMATCH COINCIDENT WITH LOW SG LEVEL. THIS EVENT WAS CAUSED BY LOSS OF AN INSTRUMENT BUS INVERTER DURING KEWAUNEE 10/30/06 305 3 3052006012 42947 OPERATE AUTO PREVENTIVE MAINTENANCE.
WHILE SHUTTING DOWN AT 10% POWER WITH ONE NI LOW RANGE HIGH POWER TRIP BISTABLE TRIPPED FOR AN UNRELATED FAILURE, A SPURIOS TRIP OF THE OTHER BISTABLE RESULTED IN AN AUTOMATIC KEWAUNEE 11/10/06 305 3 3052006013 42983 OPERATE AUTO REACTOR TRIP.
A RX TRIP OCCURRED ON LOW SG WATER LEVEL AFTER A MAIN FEEDWATER PUMP TRIPPED ON OVER CURRENT. THE CAUSE WAS A KEWAUNEE 11/28/05 305 3 3052005016 42173 OPERATE AUTO SHORT TO GROUND IN ALL THREE PHASES OF THE MOTOR.
A RX TRIP OCCURRED ON STEAM FLOW FEED FLOW MISMATCH COINCIDENT WITH A LOW STEAM GENERATOR WATER LEVEL. A FEEDWATER REGULATING VALVE FAILED CLOSED WHEN THE KEWAUNEE 06/20/01 305 3 3052001004 38080 OPERATE AUTO ASSOCIATED AIR VOLUME BOOSTER DIAPHRAGM TORE.
THE RX WAS MANUALLY TRIPPED ON AN INVALID HIGH RCP BEARING TEMPERATURE INDICATION. THE CAUSE WAS A FAILED RESISTANCE KEWAUNEE 06/06/00 305 3 3052000009 37063 OPERATE MAN TEMPERATURE DETECTOR.
THE REACTOR WAS MANUALLY TRIPPED FOLLOWING THE LOSS OF BOTH RECIRC PUMPS. THE RECIRC PUMPS TRIPPED DUE TO LOSS OF THEIR MG SETS, FOLLOWING THE LOSS OF THE 114A LOAD CENTER, CAUSED BY THE TRIP OF ITS SUPPLY BREAKER DUE TO A FAILED 13KV LIMERICK 1 06/23/10 352 1 3522010001 46042 OPERATE MAN CABLE.
THE REACTOR TRIPPED FOLLOWING A TURBINE TRIP. THE CAUSE OF THE TURBINE TRIP WAS A DEFECTIVE RELAY IN THE MAIN LIMERICK 1 03/22/08 352 1 3522008002 44088 OPERATE AUTO GENERATOR PROTECTION LOGIC.
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e R A TURBINE TRIP/RX SCRAM OCCURRED ON AN INVALID MAIN GENERATOR LOCKOUT RELAY ACTUATION. THE CAUSE WAS A CORRODED DISCONNECT POSITION SWITCH AND CONCURRENT GROUND ON THE BALANCE OF PLANT DC POWER DISTRIBUTION LIMERICK 1 07/18/05 352 1 3522005003 41848 OPERATE AUTO SYSTEM.
A RX SCRAM OCCURRED ON LOW RX VESSEL WATER LEVEL FOLLOWING A LOSS OF FEEDWATER. THE FEEDPUMPS TRIPPED ON LOW SUCTION PRESSURE FOLLOWING THE CLOSURE OF THE CONDENSATE DEEP BED DEMINERALIZER INLET HEADER BLOCK LIMERICK 1 04/23/03 352 1 3522003003 39784 OPERATE AUTO VALVE FROM INADVERTENT PERSONNEL CONTACT.
A RX SCRAM/TURBINE TRIP OCCURRED ON TURBINE THRUST BEARING WEAR DETECTOR ACTUATION DURING TURBINE COMBINED INTERMEDIATE VALVE TESTING. THE CAUSE WAS MOST LIKELY LOOSENESS IN THE STRUCTURE THAT HOLDS THE THRUST BEARING LIMERICK 1 05/19/02 352 1 3522002003 38927 OPERATE AUTO IN PLACE.
A TURBINE TRIP/RX SCRAM OCCURRED FOLLOWING A GENERATOR LOCKOUT. THE CAUSE WAS AN INADEQUATE ELECTRICAL CONNECTION ON THE MAIN TRANSFORMER, RESULTING FROM AN LIMERICK 1 05/01/00 352 1 3522000002 36947 OPERATE AUTO INADEQUATE WORK PACKAGE.
THE REACTOR WAS MANUALLY TRIPPED AFTER THE RECIRCULATION PUMPS TRIPPED. THE RECIRCULATION PUMPS TRIPPED DUE TO A MAIN GENERATOR STATOR WATER COOLANT RUNBACK. THE CAUSE LIMERICK 2 02/25/11 353 1 46641 OPERATE MAN OF THE RUNBACK IS UNDER INVESTIGATION.
AN AUTOMATIC REACTOR SCRAM OCCURRED DUE TO THE TRIP OF THE MAIN TURBINE. THE TURBINE TRIP WAS CAUSED BY A PHASE TO GROUND FAULT ON THE MAIN TRANSFORMER LOW VOLTAGE LIMERICK 2 02/01/08 353 1 3532008002 43949 OPERATE AUTO BUSHING CONNECTION TO THE ISO-PHASE BUS.
THE REACTOR TRIPPED ON LOW REACTOR WATER LEVEL, THIS EVENT WAS CAUSED BY FAILURE OF A REDUNDANT REACTIVITY CONTROL SYSTEM CARD COINCIDENT WITH SURVEILLANCE TESTING OF THE LIMERICK 2 04/24/07 353 1 3532007003 43315 OPERATE AUTO FEEDWATER CONTROL SYSTEM.
A RX SCRAM OCCURRED ON HIGH APRM FLUX WHEN THE TURBINE CONTROL VALVES CLOSED FOLLOWING A FAILURE IN THE EHC SYSTEM. THE MOST LIKELY CAUSE WAS A TRANSIENT MALFUNCTION LIMERICK 2 10/12/05 353 1 3532005004 42054 OPERATE AUTO OF A CIRCUIT CARD.
A RX SCRAM OCCURRED FOLLOWING A GENERATOR LOCKOUT AND ELECTRICAL YARD MANIPULATION. THE CAUSE WAS A FAILED 500 KV CIRCUIT BREAKER AND CONCURRENT FAILURE OF A CURRENT TRANSFORMER ASSOCIATED WITH A DIFFERENT 500 KV CIRCUIT LIMERICK 2 06/22/04 353 1 3532004001 40832 OPERATE AUTO BREAKER.
A RX SCRAM OCCURRED ON A MANUAL TURBINE TRIP DUE TO ELEVATED MAIN TURBINE VIBRATION LEVELS. THE CAUSE WAS INADEQUATE OIL DEFLECTOR GAPS ON THE MAIN TURBINE AND LIMERICK 2 03/03/03 353 1 3532003001 39632 OPERATE AUTO INADEQUATE LOW PRESSURE TURBINE GLAND SEAL CLEARANCES.
THE RX WAS MANUALLY SCRAMMED ON DECREASING CONDENSER VACUUM WHEN THE CONDENSER AIR REMOVAL SYSTEM FAILED DUE TO TEMPERATURE IN THE STEAM JET AIR EJECTOR CONDENSER EXCEEDING THE DESIGN LIMIT. THE CAUSE WAS INADEQUATE LIMERICK 2 07/23/02 353 1 3532002001 39085 OPERATE MAN OPERATING PROCEDURES.
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e R THE RX WAS MANUALLY TRIPPED WHEN A SAFETY RELIEF VALVE OPENED WHILE PERFORMING A PLANNED PLANT SHUTDOWN. THE CAUSE WAS EROSION AND OXIDATION OF THE STELLITE DISC LIMERICK 2 02/23/01 353 1 3532001001 37778 OPERATE MAN MATERIAL IN THE FIRST STAGE PILOT VALVE.
A TURBINE TRIP/RX SCRAM OCCURRED ON A GENERATOR LOCKOUT.
THE CAUSE WAS A FAILED WIRE LUG IN THE ALTERREX PHASE LIMERICK 2 06/26/01 353 1 3532001002 38097 OPERATE AUTO DIFFERENTIAL CURRENT PROTECTIVE RELAY SYSTEM.
A RX SCRAM OCCURRED FOLLOWING A MAIN GENERATOR LOCKOUT/TURBINE TRIP FROM A GROUND ON A PLANT SERVICES TRANSFORMER ALARM CIRCUIT. THE GROUND WAS CAUSED BY AN EXPOSED SPARE WIRE ON THE TRANSFORMER LOW LIQUID LEVEL LIMERICK 2 01/08/00 353 1 3532000001 36573 OPERATE AUTO SWITCH.
THE REACTOR TRIPPED ON THROTTLE CONTROL VALVE FAST CLOSURE FOLLOWING A MAIN POWER TRANSFORMER TRIP AND SUBSEQUENT LOAD REJECTION. THE ROOT CAUSE WAS DETERMINED TO BE EXTERNAL BUSHING FLASHOVER DUE TO MOIST SNOW AND ICE LASALLE 1 02/01/11 373 3 3732011001 46582 OPERATE AUTO BUILDUP ALONG THE BUSHING SKIRT.
THE REACTOR TRIPPED DUE TO A FAULT ON THE MAIN POWER TRANSFORMER. THE FAULT WAS CAUSED BY A FAILED SURGE ARRESTOR. THE SURGE ARRESTOR FAILED DUE TO A THE REACTOR AUTOMATICALLY TRIPPED DUE TO A MAIN LASALLE 1 05/21/09 373 3 3732009001 45087 OPERATE AUTO MANUFACTURING DEFECT. POWER TRANSFORMER FAULT.
A RX SCRAM OCCURRED ON LOW RCS PRESSURE AFTER A TURBINE CONTROL SYSTEM MALFUNCTION RESULTED IN OPENING ALL MAIN TURBINE BYPASS VALVES DURING A NORMAL SHUTDOWN. THE CAUSE WAS A FAILED POWER SUPPLY IN THE MAIN TURBINE EHC LASALLE 1 02/20/06 373 3 3732006001 42348 OPERATE AUTO SYSTEM.
THE RX WAS MANUALLY SCRAMMED ON DECREASING RX WATER LEVEL WHILE PERFORMING A POWER REDUCTION AND TRANSFER FROM THE TURBINE TO MOTOR DRIVEN RX FEED PUMP. THE CAUSE WAS A STUCK OPEN TURBINE DRIVEN FEED PUMP DISCHARGE CHECK LASALLE 1 11/27/03 373 3 3732003005 40357 OPERATE MAN VALVE.
A TURBINE TRIP/RX SCRAM RESULTED FROM A PHASE-TO-GROUND FAULT BETWEEN THE MAIN POWER TRANSFORMER AND THE SWITCHYARD. THE CAUSE WAS A BUILDUP OF BIRD EXCREMENT ON A LASALLE 1 01/31/01 373 3 3732001001 37707 OPERATE AUTO TRANSMISSION LINE SUPPORT INSULATOR.
THE REACTOR SCRAMMED FOLLOWING A TURBINE TRIP. THE TURBINE TRIPPED DURING WEEKLY TURBINE TRIP TESTING. THE CAUSE OF THE TURBINE TRIP WAS FAILURE OF A CARD IN THE LASALLE 2 08/15/09 374 3 3742009001 45265 OPERATE AUTO ELECTRO-DIGITAL CONTROL SYSTEM.
THE RX WAS MANUALLY SCRAMMED ON LOWERING VESSEL WATER LEVEL FOLLOWING THE LOSS OF A CONDENSATE PUMP AND THE "2A
& 2C" HEATER DRAIN PUMPS WHICH RESULTED IN A LOSS OF BOTH TURBINE DRIVEN FEED PUMPS. THE CONDENSATE PUMP "B" PHASE LASALLE 2 01/10/03 374 3 3742003001 39500 OPERATE MAN MOTOR LUG FAILED.
A RX SCRAM/TURBINE TRIP OCCURRED ON A MAIN GENERATOR LOCKOUT. THE CAUSE WAS A FAULT ON ONE PHASE OF THE MAIN LASALLE 2 07/07/03 374 3 3742003004 39982 OPERATE AUTO POWER DISCONNECT IN THE SWITCHYARD.
A TURBINE/RX TRIP OCCURRED ON HIGH RX WATER LEVEL. THE CAUSE WAS A BLOWN FUSE IN THE FEEDWATER CONTROL SYSTEM LASALLE 2 04/06/01 374 3 3742001001 37895 OPERATE AUTO WHICH CAUSED THE RX RECIRCULATION PUMPS TO DOWN SHIFT.
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e R A TURBINE TRIP/RX SCRAM RESULTED FROM HIGH TURBINE VIBRATION DURING TURBINE CONTROL VALVE (TCV) TESTING. THE CAUSE WAS A HIGH RESISTANCE CONNECTION IN THE TCV #3 LASALLE 2 05/27/01 374 3 3742001002 38034 OPERATE AUTO POSITION INDICATION CIRCUITRY.
THE RX WAS MANUALLY SCRAMMED FOLLOWING THE LOSS OF POWER TO THE FEEDWATER CONTROL SYSTEM. THE CAUSE WAS FAILED FUSES IN THE POTENTIAL TRANSFORMER PORTION OF THE LASALLE 2 09/03/01 374 3 3742001003 38262 OPERATE MAN DIVISION "1" UNDER VOLTAGE PROTECTIVE CIRCUIT.
THE RX WAS MANUALLY SCRAMMED FOLLOWING THE LOSS OF TWO LOW PRESSURE FEEDWATER HEATER STRINGS. THE CAUSE WAS INADEQUATE PROCEDURES THAT ALLOWED THE HEATER DRAINS TO LASALLE 2 09/07/01 374 3 3742001004 38269 OPERATE MAN BE LINED UP INCORRECTLY FOR EXISTING PLANT CONDITIONS.
A RX SCRAM OCCURRED ON LOW RX WATER LEVEL WHEN A TURBINE DRIVEN RX FEED PUMP WAS LOST. THE CAUSE WAS THE INTRUSION OF WEAR PRODUCTS INTO THE HIGH PRESSURE CONTROL OIL PRESSURE REGULATING RELIEF VALVE WHICH CAUSED THE FEED LASALLE 2 06/22/00 374 3 3742000003 37102 OPERATE AUTO PUMP CONTROL VALVE TO CLOSE.
A TURBINE TRIP/RX SCRAM OCCURRED ON HIGH RX VESSEL WATER LEVEL WHILE PLACING THE TURBINE DRIVEN RX FEEDWATER PUMP IN SERVICE. THE CAUSE WAS INADEQUATE EVOLUTION PREPARATION COMBINED WITH SLUGGISH RESPONSE FROM THE FEEDWATER AND LASALLE 2 12/01/00 374 3 3742000006 37562 OPERATE AUTO RX LEVEL CONTROL SYSTEM.
THE REACTOR WAS MANUALLY TRIPPED WHILE SHUTTING DOWN, WHEN THE SECOND MAIN FEEDWATER PUMP TRIPPED FOLLOWING MCGUIRE 1 01/20/11 369 2 3692011002 46559 OPERATE MAN THE FIRST MFW PUMP BEING SECURED.
WITH POWER REDUCED TO 44% DUE TO A DROPPED CONTROL ROD, THE REACTOR WAS MANUALLY TRIPPED ON INDICATION OF A SECOND DROPPED CONTROL ROD. THE DROPPED RODS WERE CAUSED BY A DEGRADED SOLDER JOINT IN A POWER CABINENT MCGUIRE 1 06/12/10 369 2 3692010003 46003 OPERATE MAN REGULATING CARD.
THE REACTOR TRIPPED FROM 100% POWER DUE TO THE TRIP OF THE 1B REACTOR COOLANT PUMP. THE OVER CURRENT RELAYS WERE PICKED UP ON THE SAFETY BKR AND THE 6900V SUPPLY BREAKER.
THE TRIP WAS ULTIMATELY CAUSED BY A FAILED PUMP MOTOR MCGUIRE 1 06/26/08 369 2 3692008002 44318 OPERATE AUTO SURGE SUPPRESSING CAPACITOR.
A TURBINE/RX TRIP OCCURRED ON HIGH SG WATER LEVEL WHICH RESULTED FROM A FAILED FEED FLOW CHANNEL. THE CAUSE WAS INTERMITTENT DEGRADED VOLTAGE TO THE SG FLOW MCGUIRE 1 12/17/05 369 2 3692005006 42211 OPERATE AUTO TRANSMITTER.
THE RX WAS MANUALLY TRIPPED ON DECREASING SG WATER LEVEL AFTER A FEEDWATER REGULATING VALVE AND ITS BYPASS VALVE FAILED CLOSED. THE CAUSE WAS A LOSS OF NORMAL AND BACKUP ELECTRICAL POWER TO THE CONTROL CIRCUITRY FOR THE VALVES MCGUIRE 1 03/04/02 369 2 3692002001 38748 OPERATE MAN WHEN A CAPACITOR FAILED.
A RX TRIP OCCURRED ON LOW SG LEVEL DURING A FEEDWATER TRANSIENT. THE TRANSIENT RESULTED FROM A LOSS OF VITAL 120 VOLT AC POWER DUE TO THE MECHANICAL-RELATED FAILURE OF A MCGUIRE 1 05/25/00 369 2 3692000004 37032 OPERATE AUTO VITAL INVERTER OUTPUT SWITCH.
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be r um n tN tio ep cr ip or n /D tR atio es E DA Even ifi se NA TE c OD Ca M DO CK ns tN E u PL EN ET ee ot M AM NO AN T RE Ev UN Sc T EV GI ON Lic en IT SC ram TE S
e R THE RX WAS MANUALLY TRIPPED IN RESPONSE TO A FIRE IN A HYDROGEN DRYER IN THE HYDROGEN SUPPLY TO THE TURBINE GENERATOR WHEN A PIPE PLUG FAILED AND BLEW OUT. THE CAUSE WAS INADEQUATE MAINTENANCE AND WORK PRACTICES THAT MCGUIRE 2 08/22/02 370 2 3702002002 39145 OPERATE MAN RESULTED IN THREAD DAMAGE.
A RX TRIP OCCURRED ON OTDT FOLLOWING THE CLOSURE OF ALL MSIVS. DURING A CALIBRATION PROCEDURE, A STEAMLINE PRESSURE CHANNEL WAS PLACED IN TEST, BUT THE WRONG PRESSURE TRANSMITTER WAS ISOLATED AND VENTED. THE CAUSE MCGUIRE 2 07/16/01 370 2 3702001001 38143 OPERATE AUTO WAS PERSONNEL ERROR.
THE RX WAS MANUALLY TRIPPED FOLLOWING AN INVALID TURBINE RUNBACK WHICH WOULD NOT CLEAR. THE OVER-POWER DELTA-TEMP AND OVER-TEMP DELTA-TEMP LOGIC ACTUATED WHEN A POWER SUPPLY CIRCUIT BREAKER OPENED FOR UNKNOWN MCGUIRE 2 11/15/00 370 2 3702000002 37524 OPERATE MAN REASONS.
WITH THE 1R TRANSFORMER OUT FOR MAINTENANCE, THE 2R TRANSFORMER EXPERIENCED A LOCKOUT RESULTING IN LOSS OF MONTICELLO 09/11/08 263 3 2632008005 44484 OPERATE AUTO OFFSITE POWER, WHICH RESULTED IN A REACTOR TRIP.
A REACTOR SCRAM OCCURRED AT 87% POWER WHILE PERFORMING TURBINE VALVE TESTING. THE CAUSE WAS FAILURE OF THE MONTICELLO 01/10/07 263 3 2632007001 43088 OPERATE AUTO SUPPORTS FOR THE TURBINE CONTROL VALVE ENCLOSURE.
A RX SCRAM OCCURRED ON A TURBINE CONTROL VALVE FAST CLOSURE (LOAD REJECT) SIGNAL RESULTING FROM FAILURE OF THE CODED RPS AND EQUIP SYSTEM AS TURBINE STEAM MAIN TURBINE PRESSURE CONTROL SYSTEM. THE CAUSE WAS BYPASS CONTROL SYSTEM. I BELIEVE THIS IS THE TURBINE FAILURE OF THE MECHANICAL PRESSURE REGULATOR CAUSED BY A PRESSURE CONTROL SYSTEM. PLEASE CORRECT ME IF MONTICELLO 01/21/02 263 3 2632002001 38642 OPERATE AUTO DAMAGED RATE FEEDBACK BELLOWS. WRONG. NO CHANGES PER REV 1.
A RX SCRAM OCCURRED ON AN MSIV ISOLATION WHEN MSIV MONTICELLO 10/23/01 263 3 2632001011 38420 OPERATE AUTO ISOLATION INSTRUMENTATION WAS INADVERTENTLY BUMPED.
THE REACTOR WAS MANUALLY TRIPPED FOLLOWING THE TRIP OF A CIRC WATER PUMP. THE CIRC WATER PUMP TRIPPED ON HIGH DELTA PRESSURE ACROSS ITS SCREENS. THIS OCCURRED WHILE ANOTHER MILLSTONE 2 02/26/10 336 1 3362010001 45729 OPERATE MAN CIRC WATER PUMP WAS UNAVAILABLE DUE TO MAINTENANCE.
FOLLOWING OSCILLATIONS IN A FEED REG VALVE, THE REACTOR WAS MANUALLY TRIPPED WHEN STEAM GENERATOR LEVEL BEGAN RISING AND COULD NOT BE CONTROLLED. THE FRV FAILURE WAS CAUSED BY VIBRATION INDUCED WEAR OF THE VALVE POSITIONER BEAM MILLSTONE 2 05/22/10 336 1 3362010002 45945 OPERATE MAN SCREW.
WITH ONE CIRC WATER PUMP OUT FOR MAINTENANCE, THE OTHER PUMP TRIPPED RESULTING IN LOW CONDENSER VACUUM. THE MAIN TURBINE AND REACTOR TRIPPED. THE CIRC WATER PUMP TRIP WAS CAUSED BY PERSONNEL ERROR AND THE PROCEDURE USED FOR MILLSTONE 2 11/28/10 336 1 3362010003 46441 OPERATE AUTO BACKWASHING THE WATERBOX THE REACTOR TRIPPED ON HIGH PZR PRESSURE FOLLOWING CLOSURE OF THE MAIN TURBINE STOP VALVES. THE CAUSE OF THE TURBINE STOP VALVES CLOSING IS THOUGHT TO BE A BRIEF LOSS OF THE 115-KV LINE RESULTING IN A FLUCTUATION OF 24V DC POWER MILLSTONE 2 07/03/09 336 1 3362009001 45183 OPERATE AUTO TO THE EHC SYSTEM.
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e R AN AUTOMATIC REACTOR SCRAM OCCURRED WHEN LIGHTNING STRIKES CAUSED A GRID DISTURBANCE WHICH CAUSED THE TURBINE SCRAM CAUSED BY GRID DISTURBANCE CAUSED BY MILLSTONE 2 05/22/08 336 1 3362008003 44234 OPERATE AUTO TO TRIP AND ACTUATION OF THE REACTOR PROTECTION SYSTEM. LIGHTNING STRIKES.
LOSS OF OFFSITE POWER DUE TO FAILURE OF THE RESERVE STATION SERVICE TRANSFORMER RESULTED IN A REACTOR SCRAM FROM <1%
MILLSTONE 2 05/24/08 336 1 3362008004 44238 STARTUP AUTO POWER.
THE REACTOR WAS MANUALLY TRIPPED FOLLOWING THE LOSS OF BOTH FEEDWATER PUMPS. THE CAUSE OF THE LOSS OF THE FEEDWATER PUMPS WAS INEFFECTIVE CONFIGURATION CONTROL OF PARTS ALLOWED PARTS TO BE INSTALLED THAT CAUSED THE LC MILLSTONE 2 06/28/08 336 1 3362008005 44326 OPERATE MAN SYSTEM TO OPERATE INCORRECTLY.
THE RX WAS MANUALLY TRIPPED FOLLOWING A LOSS OF MAIN FEEDWATER. THE CAUSE WAS AN INSTRUMENT AIR LINE FAILURE MILLSTONE 2 02/23/06 336 1 3362006002 42367 OPERATE MAN DURING A MAINTENANCE ACTIVITY.
THE RX WAS MANUALLY TRIPPED AFTER A FEEDPUMP TRIPPED UNEXPECTEDLY AND WOULD NOT RESET. THE CAUSE WAS MILLSTONE 2 03/06/04 336 1 3362004001 40570 OPERATE MAN AGITATION OF A RELAY IN THE FEEDWATER PUMP CONTROL SYSTEM.
A RX TRIP OCCURRED ON LOW SG WATER LEVEL FOLLOWING THE SPURIOUS LOSS OF A MAIN FEED PUMP DURING A OVERSPEED LOCKOUT TEST. THE CAUSE IS BELIEVED TO BE THE USE OF A MILLSTONE 2 03/15/04 336 1 3362004002 40591 OPERATE AUTO PROBLEMATIC LOCKOUT CONTROL SWITCH FOR THE TESTING.
A RX TRIP OCCURRED DURING RPS TESTING DUE TO A FAULT IN THE TEST CIRCUITRY. THE CAUSE WAS POOR WORKMANSHIP OF THE ORIGINAL RPS MATRIX TEST MODULE WHICH CAUSED STRAIN MILLSTONE 2 03/07/03 336 1 3362003002 39644 OPERATE AUTO FAILURE OF THE WIRING AT THE SWITCH TERMINAL JOINT.
THE RX WAS MANUALLY TRIPPED ON HIGH TURBINE VIBRATION WHILE ATTEMPTING TO ROLL THE TURBINE FOLLOWING INSTALLATION OF A NEW TURBINE ROTOR. THE CONSTRUCTION OF THE NEW MONOBLOCK ROTOR MADE IT MORE SENSITIVE TO MILLSTONE 2 11/27/03 336 1 3362003006 40358 OPERATE MAN RUBBING.
THE RX WAS MANUALLY TRIPPED ON HIGH MAIN TURBINE VIBRATION. THE VIBRATIONS WERE ANTICIPATED DUE TO A NEWLY INSTALLED TURBINE ROTOR. THE CONSTRUCTION OF THE NEW MILLSTONE 2 11/28/03 336 1 3362003006 40361 OPERATE MAN ROTOR MADE IT MORE SENSITIVE TO RUBBING.
A TURBINE/RX TRIP OCCURRED WHEN A TEMPERATURE SWITCH IN THE STATOR WATER COOLING SYSTEM TRIPPED ON A HIGH VALUE.
THE SWITCH WAS FOUND WITH A TRIP SETPOINT LOWER THAN THE ACCEPTANCE CRITERIA. THE CAUSE WAS EITHER EQUIPMENT FAILURE MILLSTONE 2 04/19/02 336 1 3362002002 38864 OPERATE AUTO OR CALIBRATION ERROR.
A RX TRIP OCCURRED ON LOW SG WATER LEVEL RESULTING FROM FEEDWATER REVERSE FLOW THROUGH THE "B" SG FEEDPUMP DISCHARGE CHECK VALVE. THE VALVE FAILED DUE TO AN MILLSTONE 2 08/07/02 336 1 3362002005 39115 OPERATE AUTO INADEQUATE ANTI-ROTATION WELD.
A TURBINE/RX TRIP OCCURRED ON DEGRADED CONDENSER VACUUM FOLLOWING THE LOSS OF BOTH CIRCULATING WATER PUMPS. THE CAUSE WAS INADEQUATE PROCEDURES WHICH DID NOT INCLUDE THE CORRECT INFORMATION OR REQUIRE THE CORRECT MILLSTONE 2 04/29/01 336 1 3362001003 37952 OPERATE AUTO VERIFICATIONS FOR LIFTING LEADS.
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e R THE RX WAS MANUALLY TRIPPED AFTER THE ONLY OPERATING "A" CONDENSOR CIRC PUMP TRIPPED. THE OTHER CIRC PUMP AND BOTH TRAVELING SCREENS WERE TAGGED OUT FOR DIVING OPERATIONS.
TRAVELING SCREEN D/P EVENTUALLY REACHED THE CIRC PUMP TRIP MILLSTONE 2 05/07/01 336 1 3362001004 37969 OPERATE MAN SETPOINT.
THE RX WAS MANUALLY TRIPPED ON RAPIDLY DECREASING SG WATER LEVEL. A TRANSIENT IN THE FEEDWATER HEATER DRAIN SYSTEM ULTIMATLEY RESULTED IN A TOTAL LOSS OF FEEDWATER MILLSTONE 2 01/27/00 336 1 3362000001 36633 OPERATE MAN FLOW.
THE RX WAS MANUALLY TRIPPED AFTER TWO CONTROL RODS DROPPED INTO THE CORE. THE CAUSE OF THE FIRST DROP WAS A CIRCUIT GROUND BETWEEN INTERPOSING CABLING AND THE COIL STACK. THE SECOND DROP WAS CAUSED BY FAILED RELAYS IN THE MILLSTONE 2 02/11/00 336 1 3362000003 36682 OPERATE MAN UPPER GRIPPER CIRCUIT.
A TURBINE TRIP/RX TRIP OCCURRED DURING SURVEILLANCE TESTING OF THE MAIN TURBINE. THE CAUSE WAS A COMPONENT FAILURE MILLSTONE 2 06/04/00 336 1 3362000010 37053 OPERATE AUTO RELATED TO THE POWER LOAD UNBALANCE TEST PUSH BUTTON.
A FEEDWATER TRANSIENT RESULTED IN A LOW STEAM GENERATOR WATER LEVEL, WHICH CAUSED THE REACTOR TO TRIP. THE FEEDWATER TRANSIENT WAS CAUSED BY THE FAILURE OF THE FEED REG BYPASS VALVE TO CONTROL LEVEL IN AUTO OR MANUAL DUE TO MILLSTONE 3 05/17/10 423 1 4232010002 45931 OPERATE AUTO INADEQUATE DESIGN.
THE REACTOR TRIPPED FOLLOWING A MAIN TURBINE TRIP CAUSED BY A GENERATOR ELECTRICAL FAULT. THE ELECTRICAL FAULT WAS MOST PROBABLY DUE TO A GROUND FAULT IN THE "C" PHASE MAIN MILLSTONE 3 12/19/09 423 1 4232009002 45583 OPERATE AUTO GENERATOR ISOPHASE DUCTING.
WHILE REDUCING POWER FOR PLANNED SHUTDOWN, A SG LEVEL INCREASED CAUSING A TURBINE TRIP AND FEEDWATER ISOLATION WHICH CAUSED THE REACTOR TO TRIP ON LOW SG LEVEL. THE CAUSE OF THE SG OSCILLATIONS WAS PERSONNEL ERROR IN REMOVING FW MILLSTONE 3 10/11/08 423 1 4232008003 44564 OPERATE AUTO COMPONENTS FROM SERVICE.
A RX TRIP OCCURRED ON AN INADVERTANT SSPS STEAM LINE PRESSURE LOW SIGNAL THAT ALSO CLOSED THE MSIVS AND STARTED MILLSTONE 3 04/17/05 423 1 4232005002 41607 OPERATE AUTO ONE TRAIN OF ECCS. THE CAUSE WAS A FAILED SSPS LOGIC CARD.
THE RX WAS MANUALLY TRIPPED ON THE LOSS OF TWO OF SIX CIRC WATER PUMPS ON HIGH DIFFERENTIAL PRESSURE ACROSS THE TRAVELING SCREENS. THE CAUSE WAS HIGH WIND AND WAVE ACTION THAT RESULTED IN SEA WEED AND RELATED DEBRIS BUILDUP MILLSTONE 3 09/29/05 423 1 4232005003 42024 OPERATE MAN AT THE INTAKE STRUCTURE.
A RX TRIP OCCURRED ON LOW SG WATER LEVEL RESULTING FROM A TURBINE TRIP TRANSIENT DURING A POWER REDUCTION FOR CONTAINMENT ENTRY. THE MANUAL TURBINE TRIP WAS DUE TO MILLSTONE 3 12/01/05 423 1 4232005005 42180 OPERATE AUTO HIGH VIBRATION.
A TURBINE/RX TRIP RESULTED FROM A MAIN GENERATOR BACKUP RELAY PROTECTION TRIP DUE TO A GENERATOR STATOR GROUND FAULT ON PHASE "A". THE CAUSE WAS A GENERATOR STATOR COOLING WATER PIN HOLE LEAK IN THE BRAZE MATERIAL OF A MILLSTONE 3 12/23/02 423 1 4232003001 39467 OPERATE AUTO JOINT.
THE REACTOR WAS MANUALLY TRIPPED DURING PHYSICS TESTING NORTH ANNA 1 10/22/10 338 2 3382010004 46352 STARTUP MAN DUE TO A PROBLEM WITH THE CONTROL ROD IN-HOLD-OUT SWITCH.
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be r um n tN tio ep cr ip or n /D tR atio es E DA Even ifi se NA TE c OD Ca M DO CK ns tN E u PL EN ET ee ot M AM NO AN T RE Ev UN Sc T EV GI ON Lic en IT SC ram TE S
e R FAILURE OF A PROCESS RACK CARD CAUSED THE "B" MAIN FEED REGULATION VALVE TO FAIL CLOSED. THIS RESULTED IN A STEAM FLOW - FEED FLOW MISMATCH REACTOR TRIP COINCEDENT WITH NORTH ANNA 1 01/03/07 338 2 3382007001 43072 OPERATE AUTO STEAM GENERATOR LOW LEVEL.
THE RX WAS MANUALLY TRIPPED FOLLOWING A MAIN TURBINE LUBE OIL LEAK WHICH CAUSED THE TURBINE CONTROL VALVES TO DRIFT SHUT. THE LEAK WAS THROUGH THE DIAPHRAGM ON THE EHC INTERFACE VALVE RESULTING IN A LOSS OF EHC FLUID TO THE NORTH ANNA 1 04/19/03 338 2 3382003003 39773 OPERATE MAN TURBINE CONTROL SYSTEM.
A RX/TURBINE TRIP OCCURRED ON A MAIN TRANSFORMER LOCKOUT. AN UNUSED ELECTRICAL LEAD DISENGAGED FROM THE NO-LOAD TAP CHANGER AND CAME IN CONTACT WITH THE TRANSFORMER CASING. THE CAUSE WAS IMPROPER ASSEMBLY NORTH ANNA 1 06/11/03 338 2 3382003004 39923 OPERATE AUTO DURING MANUFACTURING.
A TURBINE/RX TRIP OCCURRED ON A GENERATOR LOCKOUT RESULTING FROM A GENERATOR OUTPUT BREAKER MALFUNCTION.
NORTH ANNA 1 05/07/00 338 2 3382000004 36978 OPERATE AUTO THE CAUSE WAS A GROUND ON ONE PHASE OF THE BREAKER.
WHILE TESTING THE MAIN GENERATOR AUTOMATIC VOLTAGE REGULATOR, A GENERATOR LOCKOUT AND TURBINE TRIP NORTH ANNA 2 04/27/10 339 2 3392010001 45877 OPERATE AUTO OCCURRED. THIS RESULTED IN A REACTOR TRIP.
LOSS OF THE B STATION SERVICE BUS RESULTED IN A REACTOR TRIP DUE TO LOSS OF THE B REACTOR COOLANT PUMP. THE CAUSE OF THE LOSS OF THE SERVICE BUS WAS A LIGHTNING STRIKE IN THE NORTH ANNA 2 05/28/10 339 2 3392010002 45960 OPERATE AUTO SWITCHYARD.
DURING A LIGHTNING STORM THE REACTOR TRIPPED ON TWO CHANNELS OF "OVER TEMPERATURE DELTA T". THE CAUSE WAS A LIGHTNING INDUCED VOLTAGE TRANSIENT FROM A STRIKE WITHIN THE REACTOR TRIPPED ON TWO CHANNELS OF "OVER NORTH ANNA 2 06/16/10 339 2 3392010004 46020 OPERATE AUTO THE PROTECTED AREA. TEMPERATURE DELTA T" FOLLOWING LOSS OF THE C RSST, THE UNIT 2 G BUS FAILED TO TRANSFER TO THE B RSST. THIS RESULTED IN THE LOSS OF UNIT 2 CIRC WATER AND A SUBSEQUENT TURBINE TRIP ON LOW VACUUM.
NORTH ANNA 2 12/09/09 339 2 3382009004 45556 OPERATE AUTO THE REACTOR TRIPPED FOLLOWING THE TURBINE TRIP.
A SPURIOUS "B" TRAIN SI SIGNAL RESULTED IN A TURBINE TRIP AND NORTH ANNA 2 06/29/07 339 2 3392007003 43462 OPERATE AUTO SUBSEQUENT REACTOR TRIP.
THE REACTOR TRIPPED DUE TO A TRIP OF THE B RCP. THE REACTOR COOLANT PUMP TRIPPED DUE TO A PHASE B TO GROUND FAULT ON NORTH ANNA 2 12/25/07 339 2 3392007004 43866 OPERATE AUTO THE RCP MOTOR.
FAILURE OF AN ISOLATION CARD CAUSED THE B MAIN FEED REG VALVE TO CLOSE RESULTING IN AN AUTOMATIC REACTOR TRIP ON LOW STEAM GENERATOR LEVEL COINCIDENT WITH STEAM NORTH ANNA 2 11/16/06 339 2 3392006001 42996 OPERATE AUTO FLOW/FEED FLOW MISMATCH.
A RX TRIP OCCURRED ON OVER TEMPERATURE DELTA TEMPERATURE TRIP SIGNAL THAT WAS CAUSED BY A LIGHTNING STRIKE. AN OVER NORTH ANNA 2 08/05/05 339 2 3392005001 41898 OPERATE AUTO TEMPERATURE DELTA TEMPERATURE CONDITION DID NOT EXIST.
A RX TRIP OCCURRED DURING TESTING DUE TO AN INCORRECT CONFIGURATION OF A CELL SWITCH ON A RX BYPASS BREAKER. THE CAUSE WAS INADEQUATE WORK PRACTICES DURING A NORTH ANNA 2 06/10/04 339 2 3392004004 40804 OPERATE AUTO REPLACEMENT PROCESS AND INADEQUATE TESTING PROCEDURES.
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e R A RX TRIP OCCURRED ON STEAM FLOW GREATER THAN FEED FLOW COINCIDENT WITH A LOW SG LEVEL AFTER A FEEDWATER REGULATING VALVE FAILED CLOSED. THE CAUSE WAS A FAILED DRIVER CARD IN THE SG WATER LEVEL CONTROL SYSTEM RESULTING NORTH ANNA 2 03/31/03 339 2 3392003001 39715 OPERATE AUTO FROM A BLOWN FUSE.
A RX TRIP OCCURRED FOLLOWING A FAILURE IN THE EHC POWER SUPPLY SYSTEM. THE FAILURE CAUSED A LOSS OF LOAD TRANSIENT THAT RESULTED IN THE RX TRIPPING ON LOW SG LEVEL.
COMPONENTS HAD FAILED IN BOTH THE NORMAL AND BACKUP EHC NORTH ANNA 2 12/22/01 339 2 3392001005 38590 OPERATE AUTO POWER SUPPLIES.
A TURBINE TRIP/RX TRIP RESULTED FROM THE ACTUATION OF A STATION SERVICE LOCKOUT RELAY. THE CAUSE WAS A FAULT ON A SECONDARY FEEDER CABLE FROM A STATION SERVICE NORTH ANNA 2 04/03/00 339 2 3392000001 36857 OPERATE AUTO TRANSFORMER TO A STATION SERVICE BUS.
THE RX WAS MANUALLY TRIPPED DUE TO THE LOSS OF A RCP WHEN THE RESERVE STATION TRANSFORMER DEENERGIZED. THE CAUSE WAS PERSONNEL ERROR WHEN THE INCORRECT POTENTIAL TRANSFORMER FUSE DRAWER WAS OPENED WHILE RECOVERING A NORTH ANNA 2 04/04/00 339 2 3392000002 36864 OPERATE MAN STATION SERVICE BUS. SEE ALSO LER 3382000002.
THE REACTOR WAS MANUALLY TRIPPED AT 17% DUE TO HIGH VIBRATIONS ON TWO REACTOR COOLANT PUMPS. THE HIGH RCP VIBRATION SIGNAL WAS A FALSE SIGNAL DUE TO A FAILED POWER OCONEE 1 08/07/10 269 2 2692010002 46159 OPERATE MAN SUPPLY WITHIN THE CONTROL MODULE.
UNITS 1 AND 2 TRIPPED AUTOMATICALLY FOLLOWING A GRID DISTURBANCE. THE CAUSE OF THE TRIPS WAS A WIRING DESIGN ERROR ON THE LOSS-OF-EXCITATION RELAYS THAT CAUSED A GENERATOR LOCK-OUT. BOTH REACTORS TRIPPED BY THE REACTOR OCONEE 1 02/15/07 269 2 2692007001 43169 OPERATE AUTO COOLANT PUMP MONITORS.
A TURBINE/RX TRIP OCCURRED WHEN THE GENERATOR DISCONNECT SWITCH ON THE "Z" PHASE FAILED. THE FAILURE WAS CAUSED FROM HIGH OPERATING TEMPERATURE RESULTING FROM EITHER INADEQUATE AIRFLOW OR INADEQUATE CAPACITY OF THE OCONEE 1 09/12/01 269 2 2692001002 38281 OPERATE AUTO DISCONNECT SWITCHES.
THE REACTOR TRIPPED DUE TO A TURBINE TRIP. THE TURBINE TRIPPED ON LOW CONDENSER VACUUM DURING MAINTENANCE ON OCONEE 2 03/31/08 270 2 2702008001 44109 OPERATE AUTO THE CONDENSER VACUUM INSTRUMENTATION.
UNITS 1 AND 2 TRIPPED AUTOMATICALLY DUE TO A GRID DISTURBANCE. THE CAUSE OF THE TRIPS WAS A WIRING DESIGN ERROR ON THE LOSS-OF-EXCITATION RELAYS THAT CAUSED THE GENERATOR TO LOCK-OUT. THE REACTORS WERE TRIPPED BY THE OCONEE 2 02/15/07 270 2 2692007001 43169 OPERATE AUTO REACTOR COOLANT PUMP MONITORS.
A RX TRIP OCCURRED ON A FLUX/FLOW/IMBALANCE AFTER THE TRIP OF A RCP. TECHNICIANS TESTING AN RCP PUMP POWER TRANSDUCER CAUSED A LOSS OF ISOLATION WITH THE OPERATING OCONEE 2 04/12/06 270 2 2702006001 42493 OPERATE AUTO CIRCUIT.
THE REACTOR AUTOMATICALLY TRIPPED AT 42% POWER DUE TO A GENERATOR PHASE DIFFERENTIAL LOCKOUT. THE ROOT CAUSE OF THE TRIP WAS INCORRECT RELAY TAP SETTINGS FOLLOWING SCRAM CAUSED BY RPS ACTUATION OF THE GENERATOR OCONEE 3 05/21/09 287 2 2872009002 45088 OPERATE AUTO PREVENTIVE MAINTENANCE. PHASE DIFFERENTIAL LOCKOUT.
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e R THE REACTOR TRIPPED DUE TO RPS ACTUATION. THE CAUSE OF THE RPS ACTUATION WAS LOSS OF THE ROD POWER SUPPLY, WHICH RESULTED IN THE CONTROL RODS DROPPING. THE CAUSE OF THE SCRAM CAUSED BY RPS ACTUATION DUE TO LOSS OF THE POWER SUPPLY LOSS WAS AN IMPROPER CLOCK SIGNAL INPUT TO SINGLE ROD POWER SUPPLY, WHICH RESULTED IN THE OCONEE 3 11/07/08 287 2 2872008001 44638 OPERATE AUTO THE CRD PROCESSORS. CONTROL RODS DROPPING.
A RX TRIP OCCURRED WHEN POWER TO THE CONTROL ROD DRIVE SYSTEM WAS INTERRUPTED DURING TESTING. THE CAUSE WAS A CONTROL ROD DRIVE DESIGN DEFICIENCY INTRODUCED DURING A OCONEE 3 08/31/05 287 2 2872005002 41966 OPERATE AUTO MODIFICATION IN 2004.
A TURBINE/RX TRIP OCCURRED WHEN A SMALL PIECE OF FOREIGN MATERIAL CLOGGED THE HYDRAULIC FLUID ENTRY PORT OF A TURBINE STOP VALVE, CAUSING ALL FOUR STOP VALVES TO CLOSE.
THE CAUSE WAS INATTENTION TO DETAIL BY TWO MAINTENANCE OCONEE 3 02/26/04 287 2 2872004001 40548 OPERATE AUTO TECHNICIANS.
A MAIN TURBINE/RX TRIP OCCURRED ON HIGH MOISTURE SEPARATOR DRAIN TANK LEVEL. THE CAUSE WAS THREE SEPARATE EQUIPMENT FAILURES. TWO DIGITAL VALVE CONTROLLERS FAILED OCONEE 3 11/14/02 287 2 2872002001 39369 OPERATE AUTO AND A HIGH LEVEL SWITCH BECAME STUCK.
A RX TRIP RESULTED FROM A MANUAL TURBINE TRIP. THE TURBINE WAS TRIPPED BECAUSE OF HIGH STATOR TEMPERATURE DURING A STATOR COOLING RUNBACK TRANSIENT. THE CAUSE WAS A FAILED TEMPERATURE CONTROLLER FOR THE STATOR COOLING SYSTEM OCONEE 3 01/03/00 287 2 2872000001 36557 OPERATE AUTO PROPORTIONING VALVE.
WHILE PERFORMING LO-LO LEVEL TESTING, TWO OF THE MSIVS WENT CLOSED. THIS RESULTED IN A REACTOR TRIP. THE MSIV CLOSURE WAS CAUSED BY MISALIGNED CONNECTOR PINS IN THE MSIV CHANNEL 11 SOLENOID VALVES AND A MISALIGNED CHANEL 12 NINE MILE PT. 1 11/10/10 220 1 2202010001 46409 OPERATE AUTO LOGIC RELAY DURING TESTING.
THE REACTOR WAS MANUALLY SCRAMMED DUE TO FAILURE OF THE FEEDWATER LEVEL CONTROL SYSTEM. THE CAUSE OF THE FAILURE WAS A PROGRAMMING ERROR IN THE FIRMWARE THAT CONTROLS NINE MILE PT. 1 10/05/09 220 1 2202009003 45412 OPERATE MAN THE FEEDWATER PUMP FLOW CONTROL VALVE.
THE REACTOR WAS MANUALLY TRIPPED WHEN IT WAS DETERMINED THAT THE ELECTRONIC PRESSURE REGULATOR WAS NOT FUNCTIONING PROPERLY AND WOULD NOT ALLOW TRANSFER TO THE BACKUP REGULATER. THE CAUSE OF THE FAILURE WAS DEBRIS NINE MILE PT. 1 10/23/08 220 1 2202008002 44598 OPERATE MAN PLUGGING THE INTERNAL EPR SERVO FILTER.
A TURBINE TRIP/RX SCRAM OCCURRED FOLLOWING A SPURIOUS ACTUATION OF THE MOISTURE SEPARATOR TANK LEVEL SWITCH. THE CAUSE WAS A SHORT CIRCUIT RESULTING FROM WATER INTRUSION NINE MILE PT. 1 03/07/05 220 1 2202005001 41464 OPERATE AUTO INTO A JUNCTION BOX.
A SCRAM OCCURRED ON LOSS OF A POWER BOARD WHICH RESULTED IN A HALF SCRAM SIGNAL WHILE A HALF SCRAM SIGNAL ALREADY EXISTED DUE TO TESTING. THE CAUSE WAS INADVERTANT MECHANICAL RELAY JARRING WHICH OCCURRED DURING A NINE MILE PT. 1 08/18/05 220 1 2202005003 41927 OPERATE AUTO MAINTENANCE ACTIVITY.
THE RX WAS MANUALLY SCRAMMED WHEN AN ELECTROMATIC RELIEF VALVE STUCK OPEN AND FAILED TO CLOSE DURING POST THE SYSTEM AT NMP1 REFERED TO AS HPCI IS NOT AN ESF NINE MILE PT. 1 05/02/04 220 1 2202004001 40719 OPERATE MAN MAINTENANCE TESTING. SYSTEM PER CODING MANUAL.
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e R THE RX WAS MANUALLY SCRAMMED ON OSCILLATING RX VESSEL WATER LEVEL AFTER A FEEDWATER LEVEL CONTROL VALVE BEGAN OPERATING ERRATICALLY. THE CAUSE WAS A RUPTURED DIAPHRAGM IN THE OUTPUT PILOT VALVE FOR THE "13" FEEDWATER NINE MILE PT. 1 08/30/04 220 1 2202004004 40998 OPERATE MAN FLOW CONTROL VALVE POSITIONER.
A TURBINE TRIP/RX SCRAM OCCURRED ON A LOAD REJECT. THE NINE MILE PT. 1 08/14/03 220 1 2202003002 40071 OPERATE AUTO CAUSE WAS A MAJOR GRID DISTURBANCE AND BLACKOUT.
A TURBINE TRIP/RX SCRAM OCCURRED FOLLOWING A MAIN GENERATOR LOAD REJECT RESULTING FROM A GRID PERTURBATION COUPLED WITH A MALFUNCTION OF THE NEGATIVE PHASE SEQUENCE CURRENT RELAY. THE CAUSE WAS A DESIGN FLAW IN THE NINE MILE PT. 1 08/22/01 220 1 2202001001 38225 OPERATE AUTO RELAY.
THE RX WAS MANUALLY SCRAMMED AFTER A MAIN STEAM ELECTROMATIC RELIEF VALVE OPENED AND COULD NOT BE SHUT.
THE CAUSE WAS A BENT PILOT VALVE STEM COMBINED WITH NINE MILE PT. 1 10/02/00 220 1 2202000004 37396 STARTUP MAN PARTIAL DISENGAGEMENT OF THE DISC AND STEM ASSEMBLY.
DURING MAINTENANCE ACTIVITIES ON THE RHR SYSTEM, THE REACTOR AUTOMATICALLY SCRAMMED ON AN INVALID LOW REACTOR WATER LEVEL SIGNAL. TRANSMITTER VENTING OF A NINE MILE PT. 2 01/07/10 410 1 4102010001 45612 OPERATE AUTO COMMON INSTRUMENT LINE WAS THE CAUSE OF THE TRIP SIGNAL.
A TURBINE TRIP/RX SCRAM OCCURRED ON A LOSS OF CONDENSER VACUUM. THE CAUSE WAS A LOSS OF SEALING STEAM WHEN MECHANICAL LINKAGE FOR THE PRESSURE INDICATING CONTROLLER NINE MILE PT. 2 03/09/06 410 1 4102006001 42403 OPERATE AUTO BECAME DISCONNECTED.
A RX SCRAM OCCURRED ON POWER OSCILLATIONS AFTER A POWER SUPPLY TO THREE OF FOUR MAIN STEAM LINE FLOW INSTRUMENTS FOR THE FEEDWATER LEVEL CONTROL SYSTEM FAILED. THE CAUSE NINE MILE PT. 2 07/24/03 410 1 4102003001 40014 OPERATE AUTO WAS AGE RELATED FAILURE OF INTERNAL COMPONENTS.
A RX SCRAM RESULTED FROM A TURBINE CONTROL VALVE FAST CLOSURE SIGNAL THAT WAS GENERATED AS THE EHC SYSTEM ATTEMPTED TO CONTROL TURBINE SPEED AND RX PRESSURE IN NINE MILE PT. 2 08/14/03 410 1 4102003002 40066 OPERATE AUTO RESPONSE TO A SEVERE DISTURBANCE IN THE ELECTRIC GRID.
A RX SCRAM OCCURRED ON HIGH RX PRESSURE AFTER AN MSIV FAILED CLOSED. THE MSIV DISC SEPARATED FROM ITS STEM ALLOWING THE DISC/PISTON ASSEMBLY TO DROP INTO THE VALVE SEAT. THE CAUSE WAS DEFICIENT DESIGN, INADEQUATE STEM TO NINE MILE PT. 2 11/11/02 410 1 4102002004 39362 OPERATE AUTO DISC THREAD LOADING.
A RX SCRAM OCCURRED ON HIGH RX PRESSURE FOLLOWING A LOSS OF MAIN GENERATOR STATOR WATER COOLING AND TURBINE RUNBACK. THE STATOR WATER COOLING TEMPERATURE CONTROLLER MECHANICAL LINKAGE CONNECTION FAILED FROM NINE MILE PT. 2 12/16/02 410 1 4102002006 39450 OPERATE AUTO VIBRATION INDUCED FATIGUE FAILURE.
A TURBINE/RX TRIP RESULTED FROM THE FAILURE OF A RELAY IN THE NINE MILE PT. 2 05/16/01 410 1 4102001001 37994 OPERATE AUTO ELECTRO HYDRAULIC CONTROL SYSTEM.
A SCRAM OCCURRED WHEN THE MSIVS FAST CLOSED WHILE RESTORING A STEAM FLOW TRANSMITTER FOLLOWING TESTING. THE NINE MILE PT. 2 10/15/01 410 1 4102001004 38389 OPERATE AUTO CAUSE WAS AN INADEQUATE SURVEILLANCE PROCEDURE.
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e R THE RX WAS MANUALLY SCRAMMED ON DECREASING RX WATER LEVEL FOLLOWING THE LOSS OF A FEEDWATER PUMP. THE FEEDWATER PUMP MOTOR FAILED AS A RESULT OF A FAULTY DESIGN NINE MILE PT. 2 12/02/01 410 1 4102001006 38531 OPERATE MAN THAT LED TO CORONA INDUCED DAMAGE.
THE RX WAS MANUALLY SCRAMMED WHEN THE PRIMARY SYSTEM UNIDENTIFIED LEAK RATE EXCEEDED FIVE GPM. THE CAUSE WAS FAILED PACKING IN A RX COOLANT SYSTEM GATE VALVE DUE TO AN INADEQUATE TORQUE SPECIFICATION FROM THE PACKING NINE MILE PT. 2 12/15/01 410 1 4102001007 38574 OPERATE MAN PROGRAM.
WHILE PERFORMING A NORMAL PLANT SHUTDOWN, THE RX WAS MANUALLY SCRAMMED DUE TO THE POTENTIAL LOSS OF THE ONLY OPERATING FEED PUMP. OPERATORS WERE CONCERNED ABOUT THE PUMP DUE TO LOW SEAL INJECTION FLOW, HIGH PRESSURE NINE MILE PT. 2 03/03/00 410 1 4102000002 36753 OPERATE MAN INDICATIONS, AND A STEAM LEAK. AN SSF IS CODED FROM THIS LER.
A TURBINE TRIP/RX TRIP RESULTED FROM HIGH TURBINE BEARING VIBRATION. THE CAUSE WAS OIL WHIP/WHIRL (MOVEMENT OF THE OIL WEDGE BETWEEN THE TURBINE SHAFT AND BEARING SLEEVE).
LOW LUBE OIL TEMP MADE CONDITIONS FAVORABLE FOR OIL NINE MILE PT. 2 09/17/00 410 1 4102000014 37335 OPERATE AUTO WHIP/WHIRL.
DURING STARTUP, WITH THE REACTOR CRITICAL AT 0%, THE REACTOR TRIPPED ON A LOW CONDENSER VACUUM SIGNAL. THE TRIP WAS CAUSED BY A PROCEDURAL ERROR THAT DID NOT ENSURE ALL REQUIREMENTS WERE MET PRIOR TO EXCEEDING 500-PSIG OYSTER CREEK 12/23/10 219 1 2192010002 46507 STARTUP AUTO REACTOR PRESSURE.
THE REACTOR TRIPPED FROM FULL POWER DUE TO A FIRE IN THE THE REACTOR TRIPPED DUE TO LOSS OF THE MAIN OYSTER CREEK 02/01/09 219 1 2192009001 44822 OPERATE AUTO MAIN TRANSFORMER. TRANSFORMER.
THE REACTOR WAS MANUALLY TRIPPED WHEN COOLING WAS LOST TO ONE OF THE MAIN TRANSFORMERS. POWER TO THE COOLING SYSTEM WAS LOST WHEN THE CONTROL POWER TRANSFER TO THE OYSTER CREEK 04/25/09 219 1 2192009003 45021 OPERATE MAN COOLING SYSTEM FAILED.
THE REACTOR TRIPPED FOLLOWING A TURBINE DUE TO LOSS OF OYSTER CREEK 07/12/09 219 1 2192009005 45196 OPERATE AUTO OFFSITE POWER CAUSED BY LIGHTNING STRIKES.
A REACTER SCRAM OCCURRED DUE TO A MAIN TRANSFORMER FAULT. THE FAULT WAS CAUSED BY AN ELECTRICAL FAULT INTERNAL OYSTER CREEK 11/28/08 219 1 2192008001 44688 OPERATE AUTO TO THE MAIN TRANSFORMER.
THE REACTOR TRIPPED ON LOW REACTOR WATER LEVEL FOLLOWING LOSS OF THE "C" FEEDWATER PUMP. THE FEEDWATER PUMP OYSTER CREEK 07/17/07 219 1 2192007001 43495 OPERATE AUTO TRIPPED DUE TO AN ELECTRICAL FAULT.
WITH REDUCED POWER FOR B REACTOR RECIRC PUMP MAINTENANCE, LOSS OF CONDENSER VACUUM CAUSED A MAIN FEEDWATER PUMP TRIP. THE OPERATOR MANUALLY TRIPPED THE OYSTER CREEK 12/19/07 219 1 2192007003 43854 OPERATE MAN REACTOR ON LOW REACTOR WATER LEVEL.
A TURBINE TRIP/RX SCRAM OCCURRED ON A GENERATOR TRIP FOLLOWING AN OFFSITE ELECTRICAL TRANSIENT ON THE 230 KV TRANSMISSION LINE. THE CAUSE WAS A FAILURE OF LIGHTNING OYSTER CREEK 06/01/05 219 1 2192005002 41741 OPERATE AUTO ARRESTORS IN THE TRANSMISSION UTILITY SUBSTATION.
A RX SCRAM OCCURRED AFTER THE IRMS SPIKED CAUSING SCRAM SIGNALS IN BOTH RPS CHANNELS. THE CAUSE WAS ELECTROMAGNETIC INTERFERENCE AFFECTING THE IRM CHANNELS DUE TO LOOSE CONNECTIONS, DAMAGED CABLING, AND OYSTER CREEK 05/27/04 219 1 2192004003 40778 OPERATE AUTO GROUNDING DEFICIENCIES.
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e R THE RX WAS MANUALLY SCRAMMED FROM 60% POWER DURING A TECHNICAL SPECIFICATION REQUIRED SHUTDOWN AFTER THE LICENSEE WAS UNABLE TO REMOVE THE SECOND STAGE REHEATERS AND FEEDWATER HEATERS FROM SERVICE. THE CAUSE WAS THE THE EDG DID NOT START BECAUSE THE FAULT WAS ON THE OYSTER CREEK 05/20/03 219 1 39862 OPERATE MAN LOSS OF A 4161 V SAFETY BUS. SAFETY BUS.
A TURBINE TRIP/RX SCRAM OCCURRED ON A MAIN GENERATOR LOCKOUT FOLLOWING OFFSITE ELECTRICAL GRID INSTABILITY. THE CAUSE WAS A MAJOR GRID DISTURBANCE HOWEVER, OFFSITE OYSTER CREEK 08/14/03 219 1 2192003003 40065 OPERATE AUTO POWER REMAINED AVAILABLE.
A TURBINE TRIP/RX SCRAM OCCURRED ON HI MOISTURE SEPARATOR WATER LEVEL. THE CAUSE WAS SPURIOUS ACTUATION OF THE OYSTER CREEK 08/22/03 219 1 2192003004 40095 OPERATE AUTO MOISTURE SEPARATOR HI LEVEL SWITCH.
THE RX WAS MANUALLY SCRAMMED WHEN MULTIPLE RX RECIRCULATION PUMPS TRIPPED DURING SURVEILLANCE TESTING.
AS A RESULT OF PERSONNEL ERROR, THE RECIRCULATION PUMP TRIP OYSTER CREEK 01/21/00 219 1 2192000001 36612 OPERATE MAN SYSTEM WAS NOT PROPERLY RESET.
THE RX WAS MANUALLY SCRAMMED AFTER THREE RECIRCULATION PUMPS TRIPPED FROM A LOSS OF POWER. WHILE SHIFTING ELECTRIC LOADS FROM THE STARTUP TRANSFORMERS TO THE AUX TRANSFORMER, A 4160 VAC BUS LOST POWER. THE ROOT CAUSE OYSTER CREEK 03/01/00 219 1 2192000003 36744 OPERATE MAN WAS INADEQUATE PROCEDURAL GUIDANCE.
A RX SCRAM OCCURRED ON LOW RX WATER LEVEL WHILE WARMING THE MAIN TURBINE. AS A RESULT OF PERSONNEL ERROR, SEVERAL TURBINE BYPASS VALVES OPENED, CAUSING RX LEVEL TO INCREASE.
OPERATORS OVERCOMPENSATED WHEN LOWERING FEEDWATER OYSTER CREEK 11/15/00 219 1 2192000011 37525 STARTUP AUTO FLOW AND INCREASING LETDOWN.
LOSS OF MAIN GENERATOR LOAD RESULTED IN A MAIN TURBINE TRIP AND SUBSEQUENT REACTOR TRIP. THE LOSS OF LOAD WAS CAUSED BY A GROUND FAULT ON THE STATION POWER TRANSFORMER DUE PALISADES 01/22/11 255 3 2552011002 46564 OPERATE AUTO TO FLAWS IN THE INSULATION OF A MEDIUM VOLTAGE CABLE.
THE REACTOR WAS MANUALLY TRIPPED FOLLOWING AN AUTOMATIC TRIP OF THE B MAIN FEEDWATER PUMP. THE CAUSE OF THE MFP TRIP WAS LOW LUBE OIL PRESSURE DUE TO LOSS OF THE SHAFT-PALISADES 01/13/08 255 3 2552008001 43900 OPERATE MAN DRIVEN LUBE OIL PUMP.
THE REACTOR AUTOMATICALLY TRIPPED. THE CAUSE OF THE TRIP WAS RELATED TO A TRIP OF THE 346 NEGATIVE SEQUENCE RELAY WHICH TRIPPED THE 386C GENERATOR INDEPENDENT LOCKOUT PALISADES 05/23/08 255 3 2552008003 44237 OPERATE AUTO RELAY.
THE REACTOR AUTOMATICALLY TRIPPED ON LOW STEAM GENERATOR LEVEL. THE LOW LEVEL RESULTED FROM SPURIOUS CLOSURE OF THE B FEEDWATER REGULATING VALVE DURING THE PALISADES 05/08/07 255 3 2552007005 43351 OPERATE AUTO PERFORMANCE OF MFRV MAINTENANCE ACTIVITIES.
THE RX WAS MANUALLY TRIPPED FOLLOWING THE FAILURE OF A PALISADES 05/11/06 255 3 2552006005 42569 OPERATE MAN CONTROL ROD TO WITHDRAW DURING A STARTUP.
THE RX WAS MANUALLY TRIPPED ON LOWERING MAIN CONDENSER VACUUM. THE CAUSE WAS THE FAILURE OF AN UNCAPPED LOW PRESSURE TURBINE CASING DRAIN LINE THAT WAS ROUTED PALISADES 01/09/05 255 3 2552005001 41319 OPERATE MAN THROUGH THE MAIN CONDENSER.
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e R THE RX WAS MANUALLY TRIPPED DUE TO A HYDROGEN LEAK AT THE MAIN GENERATOR. THE LEAK WAS AT A SOCKET WELD AT A PIPING TEE CONNECTION ON A LEAK DETECTION LINE AND WAS CAUSED BY CYCLIC FATIGUE OF THE WELD DUE TO VIBRATION AND A WELD PALISADES 09/01/05 255 3 2552005005 41967 OPERATE MAN FLAW.
THE RX WAS MANUALLY TRIPPED DUE TO A FIRE IN THE CONDENSATE PUMP "2B" LOWER MOTOR BEARING. THE CAUSE WAS PUMP AND MOTOR MISALIGNMENT RESULTING FROM INADEQUATE PALISADES 08/31/04 255 3 2552004001 41002 OPERATE MAN MAINTENANCE INSTRUCTIONS.
A RX TRIP OCCURRED ON LOSS OF MAIN GENERATOR LOAD RESULTING FROM A SWITCHYARD FAULT. A STATIC LINE ON A 345 KV TRANSMISSION TOWER FELL AND CONTACTED SEVERAL SWITCHYARD LINES, TRIPPING THE MAIN GENERATOR AND CAUSING A LOSS OF AFW STARTED AND PLANT PRESSURE/TEMP WAS PALISADES 12/01/02 255 3 2552002002 39414 OPERATE AUTO NON-1E 4160 VOLT AC BUSES. MAINTAINED ON NATURAL CIRCULATION.
THE RX WAS MANUALLY TRIPPED FOLLOWING A LOSS OF BOTH MAIN FEED PUMPS. AN EDG OUTPUT BREAKER WAS INADVERTENTLY CLOSED ONTO AN ENERGIZED BUS WITH THE EDG SECURED, MOTORIZING THE EDG. THE RESULTING DEGRADED BUS VOLTAGE PALISADES 04/04/00 255 3 2552000003 36863 OPERATE MAN CAUSED THE LOSS OF THE FEED PUMPS.
AN ELECTRICAL FAULT IN THE 13.8KV NON-CLASS BUSES RESULTED IN AN EXPLOSION AND LOSS OF POWER TO TWO REACTOR COOLANT PALO VERDE 1 03/07/10 528 4 5282010001 45748 OPERATE AUTO PUMPS. THE REACTOR TRIPPED DUE TO LOSS OF THE RCPS.
THE REACTOR AUTO TRIPPED DUE TO THE CORE PROTECTION CALCULATOR GENERATING A LOW DNBR TRIP. THE CAUSE OF THE TRIP WAS FLUCTUATIONS IN A CONTROL ELEMENT ASSEMBLY PALO VERDE 1 10/21/06 528 4 5282006006 42925 OPERATE AUTO POSITION INDICATOR.
A SCRAM OCCURRED ON HIGH SG WATER LEVEL DURING A STARTUP WHILE OPERATORS WERE TRANSFERING FROM AFW TO MAIN FEEDWATER. THE CAUSE WAS INDIVIDUAL AND TEAM HUMAN PERFORMANCE DEFICIENCIES AND INADEQUATE RESOLUTION OF PALO VERDE 1 08/26/05 528 4 5282005005 41951 STARTUP AUTO IDENTIFIED DFWCS ISSUES.
THE RX WAS MANUALLY TRIPPED DUE TO A CEA SLIPPING SIX INCHES WHILE PERFORMING LOW POWER PHYSICS TESTING. THE CAUSE WAS PALO VERDE 1 05/08/04 528 4 5282004003 40737 STARTUP MAN A SLUGGISH GRIPPER PROBLEM WITH CEA 89.
A RX TRIP OCCURRED ON LOW DNBR IN RESPONSE TO A GRID DISTURBANCE AND LOSS OF OFFSITE POWER. THE CAUSE WAS A GROUND FAULT AND FAILED PROTECTIVE RELAYING IN THE OFFSITE PALO VERDE 1 06/14/04 528 4 5282004006 40815 OPERATE AUTO GRID.
THE RX WAS MANUALLY SCRAMMED ON INDICATIONS OF A CONDENSER TUBE RUPTURE AND INCREASING SG SODIUM LEVELS.
THE CAUSE WAS A DEGRADED TUBE PLUG THAT HAD BEEN PALO VERDE 1 03/27/03 528 4 5282003002 39705 OPERATE MAN INSTALLED PREVIOUSLY TO ISOLATE A LEAKING CONDENSER TUBE.
THE RX WAS MANUALLY TRIPPED ON HIGH SULFATE CONCENTRATIONS IN THE SG'S. THE LICENSEE IS INVESTIGATING THE PALO VERDE 1 10/31/02 528 4 39333 OPERATE MAN CAUSE.
A RX TRIP OCCURRED ON A LOW DNBR TRIP SIGNAL RESULTING FROM A CONTROL ELEMENT ASSEMBLY (CEA) DEVIATION. THE CAUSE WAS A FAILED OPTICAL ISOLATION CARD IN THE CONTROL SYSTEM PALO VERDE 1 11/10/02 528 4 5282002001 39361 OPERATE AUTO FOR THE CEA.
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e R THE REACTOR WAS MANUALLY TRIPPED DURING LOW POWER PHYSICS TESTING WHEN FOUR CONTROL ELEMENT ASSEMBLIES PALO VERDE 2 05/28/08 529 4 5292008002 44246 STARTUP MAN SLIPPED TO FULLY INSERTED.
THE OPERATOR MANUALLY TRIPPED THE REACTOR DUE TO HIGH STEAM GENERATOR SODIUM LEVELS. THE HIGH SODIUM LEVELS WERE CAUSED BY A CONDENSER AIR REMOVAL SYSTEM SEAL WATER PALO VERDE 2 10/06/07 529 4 5292007003 43697 OPERATE MAN COOLER TUBE RUPTURE.
FOLLOWING MAINTENANCE ON THE TURBINE CONTROL VALVE, WHILE RESTORING THE SYSTEM, A RAPID INCREASE IN POWER THE REACTOR TRIPPED DUE TO CORE PROTECTION PALO VERDE 2 07/26/06 529 4 5292006003 42730 OPERATE AUTO RESULTED IN THE REACTOR TRIPPING ON VARIABLE OVERPOWER. CALCULATOR HIGH VARIABLE OVERPOWER.
A RX TRIP OCCURRED ON LOW DNBR IN RESPONSE TO A GRID DISTURBANCE AND LOSS OF OFFSITE POWER. THE CAUSE WAS A GROUND FAULT AND FAILED PROTECTIVE RELAYING IN THE OFFSITE PALO VERDE 2 06/14/04 529 4 5282004006 40814 OPERATE AUTO GRID.
A RX TRIP OCCURRED ON LOW DNBR FOLLOWING A GENERATOR TRIP AND POWER CUTBACK. THE CAUSE WAS LIGHTNING INDUCED PALO VERDE 2 07/14/04 529 4 5292004002 40870 OPERATE AUTO DAMAGE IN THE SWITCHYARD.
THE RX WAS MANUALLY SCRAMMED AFTER A PZR SPRAY VALVE OPENED AND FAILED TO CLOSE ON DEMAND. THE SPRAY VALVES AIR OPERATED VALVE POSITIONER BALANCE BEAM WAS FOUND DISENGAGED FROM ITS PIVOT POINT. THE CAUSE WAS INADEQUATE PALO VERDE 2 07/29/03 529 4 5292003001 40033 OPERATE MAN MAINTENANCE PROCEDURES.
A RX TRIP OCCURRED ON LOW DEPARTURE FROM NUCLEATE BOILING RATIO RESULTING FROM THE CLOSURE OF THREE OF FOUR MSIVS.
THE CAUSE WAS FAILURE OF A LOGIC BOARD AND PIN CONNECTOR PALO VERDE 2 07/13/01 529 4 5292001002 38138 OPERATE AUTO IN THE MAIN STEAM AND FEEDWATER ISOLATION SYSTEM.
A RX TRIP OCCURRED ON HIGH PZR PRESSURE FOLLOWING THE CLOSURE OF ALL MSIVS. THE CAUSE WAS A POWER SUPPLY FAILURE TO THE "A" TRAIN MAIN STEAM AND FEEDWATER ISOLATION PALO VERDE 2 08/26/00 529 4 5292000001 37261 OPERATE AUTO ACTUATION SYSTEM LOGIC CONTROL CABINET.
A RX TRIP OCCURRED AFTER REACHING THE CORE PROTECTION CALCULATOR AUXILIARY VARIABLE OVERPOWER TRIP SETPOINT. THE CAUSE WAS COGNITIVE PERSONNEL ERROR WHILE PERFORMING PALO VERDE 2 11/18/00 529 4 5292000007 37533 OPERATE AUTO CONTROL ELEMENT ASSEMBLY MANIPULATIONS.
LOSS OF A MAIN FEEDWATER PUMP DUE LOW SUCTION PRESSURE CAUSED BY A MINI-FLOW VALVE FAILING OPEN, RESULTED IN AN AUTOMATIC RUNBACK FROM 100% TO 60%. THE REACTOR THEN TRIPPED ON LOW STEAM GENERATOR LEVEL AS LEVELS CONTINUED PALO VERDE 3 01/19/11 530 4 5302011001 46556 OPERATE AUTO TO DECREASE.
THE REACTOR WAS MANUALLY TRIPPED DUE TO LOSS OF INSTRUMENT AIR TO THE CONTAINMENT. THE LOSS OF AIR WAS CAUSED BY THE FAILURE A SOLENOID VALVE ON THE OUTBOARD PALO VERDE 3 12/03/09 530 4 5302009001 45537 OPERATE MAN CONTAINMENT ISOLATION VALVE.
ONE OF THE CEDM MG-SETS WAS SHUT DOWN FOR TROUBLE SHOOTING, THE OTHER MG DID NOT MAINTAIN POWER RESULTING IN A TURBINE TRIP AND REACTOR POWER CUTBACK. SUBSEQUENTLY, PALO VERDE 3 09/16/08 530 4 5302008001 44496 OPERATE MAN THE REACTOR WAS MANUALLY TRIPPED.
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e R WHILE SHUTTING DOWN DUE TO A SECONDARY CHEMICAL EXCURSION, THE REACTOR WAS MANUALLY TRIPPED WHEN THE PALO VERDE 3 09/27/08 530 4 5302008002 44525 OPERATE MAN MAIN TURBINE EXPERIENCED HIGH VIBRATIONS.
A RX TRIP OCCURRED ON LOW DEPARTURE FROM NUCLEATE BOILING RATIO TRIPS ON ALL FOUR CHANNELS. THE CAUSE WAS AN ELECTRONIC COMPONENT FAILURE ON A CIRCUIT BOARD THAT CAUSED AN INVALID CEA POSITION DEVIATION TO CEAC NUMBER PALO VERDE 3 03/05/06 530 4 5302006002 42387 OPERATE AUTO ONE.
THE RX WAS MANUALLY TRIPPED DUE TO A LARGE LEAK IN THE CONDENSATE SYSTEM. THE SIGHT GLASS FOR A CONDENSATE DEMIN PALO VERDE 3 07/01/06 530 4 5302006005 42681 OPERATE MAN VESSEL BLEW OUT OF THE VESSEL.
THE REACTOR WAS MANUALLY TRIPPED WHEN LOSS OF CONDENSER VACUUM AND A LOWERING HOTWELL LEVEL CAUSED THE TRIP OF TWO CONDENSATE PUMPS. THE LOW CONDENSER VACUUM AND LOWERING HOTWELL WAS CAUSED BY THE HOTWELL DRAW-OFF PALO VERDE 3 10/19/06 530 4 5302006007 42920 OPERATE MAN VALVE FAILING OPEN.
A RX TRIP OCCURRED ON LOW DNBR AFTER THE MAIN TURBINE INTERCEPT VALVES FAST CLOSED AND THE CONTROL VALVES RAMPED CLOSED. THE CAUSE OF THE MAIN TURBINE VALVE CLOSURE IS BELIEVED TO BE A CONTROL SYSTEM MALFUNCTION IN THE SPEED PALO VERDE 3 06/07/04 530 4 5302004002 40795 OPERATE AUTO CONTROL CIRCUIT.
A RX TRIP OCCURRED ON HIGH RX POWER FOLLOWING A GRID DISTURBANCE AND LOSS OF OFFSITE POWER. THE CAUSE WAS A GROUND FAULT AND FAILED PROTECTIVE RELAYING IN THE OFFSITE PALO VERDE 3 06/14/04 530 4 5282004006 40816 OPERATE AUTO GRID.
A RX TRIP OCCURRED ON LOW DNBR DUE TO REDUCED RCS FLOW WHEN THE MAIN TURBINE TRIPPED DURING A GRID PERTURBATION.
THE CAUSE WAS FAILURE OF AUTOMATIC FAST BUS TRANSFER TO PALO VERDE 3 07/28/03 530 4 5302003004 40029 OPERATE AUTO TRANSFER LOADS BACK TO OFFSITE SOURCES.
A RX TRIP OCCURRED ON AN AXIAL SHAPE INDEX (ASI) TRIP FROM THE CORE PROTECTION CALCULATOR. PRIOR TO THE TRIP, THE PLANT HAD REDUCED POWER TO 19% TO PERFORM MAIN TURBINE MAINTENANCE. THE POWER REDUCTION PLAN DID NOT INCLUDE ALL PALO VERDE 3 05/19/01 530 4 5302001001 38013 OPERATE AUTO FACTORS CONCERNING ASI.
THE REACTOR WAS MANUALLY TRIPPED DURING PLANT SHUTDOWN DUE TO LOSS OF CONDENSER VACUUM. THE LOSS OF VACUUM WAS CAUSED BY INCORRECTLY POSITIONED TURBINE CROSSOVER STEAM POINT BEACH 1 07/26/10 266 3 2662010002 46129 OPERATE MAN DUMP MOTOR-OPERATED VALVES.
FAILURE OF A MAIN FEEDWATER REGULATING VALVE RESULTED IN THE OPERATORS MANUALLY TRIPPING THE REACTOR. FAILURE WAS POINT BEACH 1 06/05/07 266 3 2662007004 43407 OPERATE MAN CAUSED BY THE VALVE POSITIONER ARM BECOMING DISCONNECTED.
THE RX WAS MANUALLY TRIPPED ON A LOSS OF CONDENSER VACUUM AFTER THE RUNNING CIRCULATING WATER PUMP TRIPPED.
THE CAUSE WAS FATIGUE FAILURE OF THE MOTOR TO PUMP POINT BEACH 1 12/13/05 266 3 2662005008 42199 OPERATE MAN COUPLING BOLTS.
A RX TRIP OCCURRED ON OVER TEMPERATURE DELTA TEMPERATURE FOLLOWING THE LOSS OF A ROD DRIVE MG SET. THE CAUSE WAS A FAILED SURGE SUPPRESSOR COMPONENT IN THE POWER AND POINT BEACH 1 07/15/03 266 3 2662003002 39996 OPERATE AUTO FEEDBACK CIRCUIT OF THE VOLTAGE REGULATOR.
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e R THE RX WAS MANUALLY TRIPPED DUE TO DECREASING LEVEL IN THE CIRCULATING WATER SYSTEM FORE BAY. THE CAUSE WAS ICING OF POINT BEACH 1 01/21/00 266 3 2662000001 36610 OPERATE MAN THE OFF SHORE INTAKE STRUCTURE.
THE RX WAS MANUALLY TRIPPED DUE TO CONCERNS FOR THE SAFETY OF DIVERS WORKING IN THE UNIT 2 SIDE OF THE CIRCULATING WATER PUMP HOUSE. THE CIRCULATING WATER SYSTEM WAS SECURED AND ALL DIVERS WERE REMOVED FROM THE POINT BEACH 1 10/27/00 266 3 2662000010 37463 OPERATE MAN WATER. NO PERSONNEL WERE INJURED.
THE REACTOR WAS MANUALLY TRIPPED FOLLOWING AN AUTOMATIC TURBINE TRIP CAUSED BY A GENERATOR LOCKOUT SIGNAL. THE GENERATOR LOCKOUT SIGNAL WAS CAUSED BY INCORRECTLY THE REACTOR WAS SHUTTING DOWN AT 44%, WHEN THE CALCULATED GENERATOR PROTECTION THIRD HARMONIC STATOR GENERATOR TRIPPED. THE REACTOR WAS THEN POINT BEACH 2 06/19/10 301 3 3012010001 46032 STARTUP MAN GROUND TRIP RELAY SETPOINTS. MANUALLY SCRAMMED AT 0% POWER.
THE REACTOR WAS MANUALLY TRIPPED DUE TO FAILURE OF THE "A" FEEDWATER REGULATING VALVE. THE CAUSE OF THE FAILURE WAS THE FAILURE OF THE VALVE POSITIONER RANGE DIAPHRAGM POINT BEACH 2 07/09/10 301 3 3012010002 46080 OPERATE MAN ASSEMBLY.
THE RX WAS MANUALLY TRIPPED WHEN A DIVER BECAME ENTANGLED IN THE INTAKE CRIB. CIRCULATING WATER WAS SECURED WHICH RENDERED THE MAIN CONDENSERS UNAVAILABLE POINT BEACH 2 05/15/04 301 3 3012004002 40754 OPERATE MAN FOR DECAY HEAT REMOVAL.
A RX TRIP OCCURRED ON STEAM FLOW/FEED FLOW MISMATCH COINCIDENT WITH LOW SG WATER LEVEL AFTER A MAIN FEEDWATER PUMP TRIPPED. THE CAUSE WAS FAILURE OF THE MOTOR STATOR POINT BEACH 2 07/10/03 301 3 3012003004 39988 OPERATE AUTO WINDING INSULATION DUE TO AGE RELATED DEGRADATION.
A TURBINE/RX TRIP OCCURRED FOLLOWING A MAIN GENERATOR LOCKOUT. THE LOCKOUT RESULTED FROM THE ACTUATION OF A GENERATOR STATOR NEUTRAL GROUND FAULT DETECTION RELAYS.
THE REASON FOR THE RELAY ACTUATION COULD NOT BE POINT BEACH 2 02/06/01 301 3 3012001001 37722 OPERATE AUTO DETERMINED.
THE RX WAS MANUALLY TRIPPED ON LOW CIRC WATER PUMP BAY LEVEL WHEN A LARGE INFLUX OF SMALL FISH RESULTED IN POINT BEACH 2 06/27/01 301 3 3012001002 38100 OPERATE MAN BLOCKAGE OF THE INTAKE TRAVELING SCREENS.
A RX TRIP OCCURRED DUE TO A FAILED CONTROL POWER FUSE IN AN INTERMEDIATE RANGE NUCLEAR INSTRUMENTATION CHANNEL.
EXTENSIVE TESTING COULD NOT IDENTIFY ANY FAULTED CONDITION POINT BEACH 2 12/14/00 301 3 3012000006 37594 STARTUP AUTO THAT WOULD HAVE CAUSED THE FUSE TO FAIL.
A TURBINE/RX TRIP RESULTED FROM AN ELECTRICAL FAULT ASSOCIATED WITH THE "C" PHASE OF THE MAIN STEP UP TRANSFORMER. THE CAUSE WAS A FAILED CRIMPED CONNECTION IN POINT BEACH 2 12/20/00 301 3 3012000007 37621 OPERATE AUTO A CURRENT TRANSFORMER CIRCUIT.
A TURBINE TRIP/RX SCRAM OCCURRED WHEN A FAILED MAIN TURBINE MECHANICAL TRIP VALVE ROUTINE TEST WAS INCORRECTLY PEACH BOTTOM 2 07/10/05 277 1 2772005001 41832 OPERATE AUTO ABORTED. THE CAUSE WAS FAILURE TO FOLLOW A PROCEDURE.
THE RX WAS MANUALLY SCRAMMED ON DEGRADING MAIN CONDENSER VACUUM. THE CAUSE WAS A LEAKING RX FEEDPUMP PEACH BOTTOM 2 02/22/04 277 1 2772004001 40537 OPERATE MAN TURBINE EXHAUST EXPANSION JOINT.
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e R A SCRAM OCCURRED ON MSIV CLOSURE RESULTING FROM LOW MAIN STEAM LINE PRESSURE FOLLOWING A MALFUNCTION OF THE ELECTROHYDRAULIC CONTROL SYSTEM. THE CAUSE WAS A FAILED PEACH BOTTOM 2 12/22/04 277 1 2772004003 41277 OPERATE AUTO EHC PRESSURE REGULATOR CIRCUIT CARD.
A RX SCRAM OCCURRED ON HIGH RX PRESSURE AFTER AN OUTBOARD MSIV CLOSURE. THE CAUSE WAS FATIGUE FAILURE OF A PEACH BOTTOM 2 04/12/03 277 1 2772003001 39752 OPERATE AUTO COPPER AIR LINE RESULTING FROM INADEQUATE SUPPORT.
A TURBINE TRIP/RX SCRAM OCCURRED FOLLOWING A MAIN GENERATOR PROTECTIVE RELAY ACTUATION. THE CAUSE WAS REMNANTS OF FAILED BUS COOLING FAN BELTS IN THE ISOPHASE PEACH BOTTOM 2 07/22/03 277 1 2772003003 40010 OPERATE AUTO BUS DUCT WHICH CAME IN CONTACT WITH A BUS CONDUCTOR.
A SCRAM OCCURRED WITH AN MSIV CLOSURE FOLLOWING THE LOSS OF OFFSITE POWER. THE CAUSE WAS A GRID DISTURBANCE RESULTING FROM FAILURE OF OFFSITE PROTECTIVE RELAYING PEACH BOTTOM 2 09/15/03 277 1 2772003004 40158 OPERATE AUTO DURING A LIGHTNING STORM.
A RX SCRAM OCCURRED ON AN MSIV CLOSURE RESULTING FROM LOW RX PRESSURE. THE CAUSE WAS A TURBINE EHC CIRCUIT CARD PEACH BOTTOM 2 12/21/02 277 1 2772002001 39466 OPERATE AUTO FAILURE THAT CAUSED MULTIPLE TURBINE BYPASS VALVES TO OPEN.
A TURBINE/RX TRIP OCCURRED DURING TROUBLESHOOTING OF THE TURBINE EHC SYSTEM. THE CAUSE WAS THE FAILURE OF AN EHC PEACH BOTTOM 2 07/01/01 277 1 2772001002 38109 OPERATE AUTO SYSTEM POWER SUPPLY.
A TURBINE TRIP/RX SCRAM OCCURRED ON A MAIN GENERATOR LOCKOUT. AN ISOPHASE BUS GROUND FAULT RESULTED WHEN A DUCTWORK VENTILATION DAMPER DETACHED AND FELL ONTO THE CONDUCTOR. THREE DAMPER MOUNTING SCREWS HAD BEEN PEACH BOTTOM 2 10/23/01 277 1 2772001004 38419 OPERATE AUTO STRIPPED DURING PREVIOUS MAINTENANCE.
THE RX WAS MANUALLY SCRAMMED FOLLOWING AN UNPLANNED RX RECIRCULATION PUMP TRIP. THE CAUSE WAS IMPROPER TAGOUT PEACH BOTTOM 2 09/15/00 277 1 2772000003 37330 OPERATE MAN COORDINATION.
DURING REACTOR SHUTDOWN, THE REACTOR WAS MANUALLY TRIPPED WHEN THE FEEDWATER LEVEL CONTROLLER ADDED ENOUGH COLD WATER TO CAUSE REACTOR PERIOD TO DROP BELOW PEACH BOTTOM 3 09/13/09 278 1 2782009006 45348 STARTUP MAN 50 SECONDS.
A SCRAM OCCURRED WITH AN MSIV CLOSURE FOLLOWING THE LOSS OF OFFSITE POWER. THE CAUSE WAS A GRID DISTURBANCE RESULTING FROM FAILURE OF OFFSITE PROTECTIVE RELAYING PEACH BOTTOM 3 09/15/03 278 1 2772003004 40158 OPERATE AUTO DURING A LIGHTNING STORM.
A RX SCRAM RESULTED FROM AN INVALID LOW RX WATER LEVEL SIGNAL. THE CAUSE WAS A FAILURE OF A PACKING GLAND FOLLOWER, WHICH DEPRESSURIZED THE VARIABLE LEG TO VARIOUS PEACH BOTTOM 3 08/07/00 278 1 2782000001 37212 OPERATE AUTO INSTRUMENTS.
FOLLOWING A LOSS OF OFFSITE POWER DUE TO A TORNADO TOUCHING DOWN IN THE SWITCHYARD, UNIT TWO IS BEING PRAIRIE ISLAND 1 04/16/11 282 3 46761 OPERATE AUTO SUPPLIED POWER FROM THE 2EDG AND THE 3EDG.
A LOCKOUT TRIP OF A CIRC WATER PUMP RESULTED IN A CONDENSER DIFFERENTIAL PRESSURE TRIP. THIS TRIPPED THE MAIN TURBINE AND REACTOR. THE CAUSE OF THE PUMP TRIP WAS AN AGE-PRAIRIE ISLAND 1 05/18/09 282 3 2822009005 45077 OPERATE AUTO RELATED FAILURE OF A POWER SUPPLY CABLE.
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e R THE REACTOR SCRAMMED DURING REACTOR PROTECTION SYSTEM REACTOR TRIPPED DURING TESTING WHEN ONE OVER TESTING. ONE OVER TEMPERATURE DELTA T CHANNEL WAS IN TEST TEMPERATURE DELTA T CHANNEL WAS IN TEST AND A PRAIRIE ISLAND 1 07/31/08 282 3 2822008002 44377 OPERATE AUTO WHEN A CONTROLLER IN THE OTHER CHANNEL FAILED. CONTROLLER IN THE OTHER CHANNEL FAILED.
THE RX WAS MANUALLY TRIPPED FOLLOWING THE TRIP OF A CONDENSATE AND FEEDWATER PUMP. THE CAUSE OF THE CONDENSATE PUMP TRIP WAS DEGRADED MOTOR INSULATION DUE PRAIRIE ISLAND 1 04/14/06 282 3 2822006001 42504 OPERATE MAN TO MAINTENANCE PROGRAM DEFICIENCIES.
THE RX WAS MANUALLY TRIPPED ON HIGH LEVEL IN A FEEDWATER HEATER. THE CAUSE WAS A KNOWN EXISTING PROBLEM WITH AN PRAIRIE ISLAND 1 11/15/02 282 3 2822002002 39376 OPERATE MAN EXTRACTION BELLOWS IN THE FEEDWATER HEATER.
A RX TRIP OCCURRED ON NEGATIVE FLUX RATE AFTER A GROUP OF CONTROL RODS DROPPED INTO THE CORE. THE CAUSE WAS WATER INTRUSION INTO A CONTROL ROD DRIVE POWER SUPPLY CABINET PRAIRIE ISLAND 1 08/01/01 282 3 2822001004 38179 OPERATE AUTO WHEN AN OVERHEAD ROOM COOLER DRIP TRAY OVERFLOWED.
A TURBINE/RX TRIP OCCURRED FOLLOWING A FIRE IN A 4KV BUS WHILE ALIGNING ELECTRICAL POWER FROM THE RESERVE TRANSFORMER TO THE MAIN TRANSFORMER. THE CAUSE WAS A BREAKER FAILURE RESULTING FROM A POOR BREAKER TO BUS PRAIRIE ISLAND 1 08/03/01 282 3 2822001005 38185 OPERATE AUTO ELECTRICAL CONNECTION.
WHILE SHUTTING DOWN, THE REACTOR TRIPPED FOLLOWING A TURBINE TRIP. THE TURBINE TRIPPED ON HIGH DIFFERENTIAL PRESSURE BETWEEN THE CONDENSERS. THE CAUSE OF THE HI DP WAS CONDENSATE BLOCKING THE SEALING STEAM TO THE MSR PRAIRIE ISLAND 2 04/16/10 306 3 3062010001 45851 OPERATE AUTO SAFETY VALVES CAUSING THEM TO OPEN.
THE REACTOR TRIPPED FOLLOWING A MAIN TURBINE TRIP. THE CAUSE OF THE TURBINE TRIP WAS THE LOSS OF THE 21 MAIN PRAIRIE ISLAND 2 05/25/10 306 3 3062010002 45952 OPERATE AUTO FEEDWATER PUMP DUE TO THE FAILURE OF ITS PRESSURE SWITCH.
DURING DYNAMIC ROD WORTH MEASUREMENTS, CONTROL BANK A-1 STOPPED INSERTING WHILE BANK A-2 CONTINUED TO INSERT. THE PRAIRIE ISLAND 2 10/30/08 306 3 3062008002 44615 STARTUP MAN REACTOR WAS MANUALLY TRIPPED DUE TO ROD MISALIGNMENT.
RPS ACTUATION OCCURRED DURING SURVEILLANCE TESTING OF THE SAFETY INJECTION SYSTEM DUE TO A SPURIOUS TRIP. THIS RESULTED PRAIRIE ISLAND 2 04/05/07 306 3 3062007001 43280 OPERATE AUTO IN A REACTOR TRIP.
A RX TRIP OCCURRED ON A MANUAL TURBINE TRIP FOLLOWING HIGH CONDENSER VACUUM DIFFERENTIAL PRESSURE. THE CAUSE WAS NOT CONCLUSIVELY DETERMINED BUT COULD HAVE BEEN AIR LEAKAGE THROUGH THE MOISTURE SEPARATOR REHEATER RELIEF PRAIRIE ISLAND 2 05/09/01 306 3 3062001004 37979 OPERATE AUTO VALVES.
THE RX WAS MANUALLY TRIPPED ON INCREASING CONDENSER DIFFERENTIAL PRESSURE WHILE ATTEMPTING TO REPAIR A LEAKING AIR EJECTOR STEAM SUPPLY VALVE. A VALVE ALIGNMENT ERROR PRAIRIE ISLAND 2 10/31/01 306 3 3062001005 38448 OPERATE MAN PROVIDED A PATH TO ATMOSPHERE FROM THE 2A CONDENSER.
A TURBINE TRIP/RX TRIP OCCURRED WHILE SHUTTING DOWN FOR REFUELING. THE TRIP WAS INITIATED BY A SPURIOUS FEEDWATER HEATER HI HI LEVEL SIGNAL. IT WAS CONCLUDED THAT THE SIGNAL RESULTED FROM FLASHING IN THE LOWER SENSING LINE OF THE HI PRAIRIE ISLAND 2 04/28/00 306 3 3062000001 36942 OPERATE AUTO HI LEVEL SWITCH.
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e R THE REACTOR WAS MANUALLY TRIPPED DUE TO LOSS CONTROL ROD DRIVE CHARGING HEADER PUMPS. THE LOSS OF THE PUMPS WAS PERRY 05/11/10 440 3 4402010003 45918 OPERATE MAN DUE TO THE LOSS OF POWER ON A DIVISION 2 INSTRUMENT RACK.
THE REACTOR TRIPPED FOLLOWING A MAIN TURBINE TRIP. THE CAUSE OF THE TURBINE TRIP WAS AN INVALID MOISTURE SEPARATOR REHEATER HIGH LEVEL SIGNAL. THE INVALID SIGNAL WAS DUE TO INCORRECT ADJUSTMENT OF THE LEVEL SWITCH PERRY 06/21/09 440 3 4402009001 45147 OPERATE AUTO FOLLOWING MAINTENANCE.
WHILE SHUTTING DOWN, A REACTOR RECIRCULATION PUMP TRIPPED WHILE BEING SHIFTED TO SLOW SPEED. THE REACTOR WAS MANUALLY TRIPPED. THIS WAS DIFFERENT THAN THE PLANNED PERRY 10/16/09 440 3 4402009004 45440 OPERATE MAN SHUTDOWN SEQUENCE.
DURING DIGITAL FEEDWATER TUNING, THE REACTOR TRIPPED ON LOW REACTOR LEVEL. WITH THE FEEDWATER PUMP IN MANUAL, LEVEL STARTED GOING DOWN, THE OPERATOR WAS UNABLE TO RESTORE SUFFICIENT FLOW. THIS EVENT WAS CAUSED BY AN PERRY 05/15/07 440 3 4402007001 43363 OPERATE AUTO UNDETECTED DESIGN LOGIC ERROR.
THE REACTOR TRIPPED DUE TO A TURBINE CONTROL VALVE FAST CLOSURE SIGNAL. THE CAUSE OF THE TRIP WAS FAILURE OF THE THE REACTOR TRIPPED ON A TURBINE CONTROL VALVE PERRY 11/28/07 440 3 4402007004 43808 OPERATE AUTO POWER SUPPLIES IN THE DIGITAL FEEDWATER CONTROL SYSTEM. FAST CLOSURE SIGNAL.
LOSS OF INSTRUMENT AIR CAUSED A FEEDWATER TRANSIENT WITH THE REACTOR FEED BOOSTER PUMPS CAVITATING. THE REACTOR PERRY 12/13/06 440 3 4402006005 43049 OPERATE MAN WAS MANUALLY SCRAMMED.
THE RX WAS MANUALLY SCRAMMED ON UNDESIRABLE POWER TO FLOW CONDITIONS AFTER BOTH RX RECIRCULATION PUMPS DOWN-SHIFTED TO SLOW SPEED AND THAN PUMP "A" TRIPPED OFF. THE CAUSE WAS A FAILED OPTICAL ISOLATOR IN THE RX RECIRCULATION PERRY 01/06/05 440 3 4402005001 41310 OPERATE MAN SYSTEM LOGIC CIRCUITRY.
A SCRAM OCCURRED WHEN CORE OSCILLATIONS WERE DETECTED BY THE OPRM MONITOR AFTER BOTH RECIRC PUMPS DOWNSHIFTED TO SLOW SPEED. THE CAUSE WAS DETERMINED TO BE AN INTERMITTENT FAULTY OPTICAL ISOLATOR IN THE PUMP CONTROL PERRY 12/23/04 440 3 4402004002 41290 OPERATE AUTO CIRCUIT.
A RX SCRAM OCCURRED ON A TURBINE CONTROL VALVE FAST CLOSURE. THE CAUSE WAS A MAJOR GRID DISTURBANCE AND PERRY 08/14/03 440 3 4402003002 40063 OPERATE AUTO BLACKOUT.
A TURBINE TRIP/RX SCRAM OCCURRED DURING TESTING WHEN THE TURBINE PROTECTION DEVICE TRIP TEST MALFUNCTIONED AND CAUSED THE MAIN TURBINE TO TRIP. THE CAUSE WAS FAILURE OF THE TURBINE TRIP LATCH ASSEMBLY TO RESET AS A RESULT OF TWO PERRY 09/22/02 440 3 4402002001 39207 OPERATE AUTO MISSING SETSCREWS.
THE RX WAS MANUALLY SCRAMMED ON DECREASING MAIN CONDENSER VACUUM AFTER THE GENERATOR WAS TAKEN OFFLINE.
THE CAUSE WAS INADEQUATELY TORQUED COVERS ON THE MOISTURE SEPARATOR DRAIN TANKS WHICH ALLOWED AIR TO PERRY 04/29/01 440 3 4402001001 37951 OPERATE MAN ENTER THE CONDENSER.
A RX SCRAM OCCURRED ON LOW RX WATER LEVEL FOLLOWING A LOSS OF FEEDWATER. THE CAUSE WAS A BLOWN FUSE IN A 24 VDC PERRY 07/11/01 440 3 4402001003 38131 OPERATE AUTO POWER SUPPLY TO FEEDWATER CONTROL INSTRUMENTATION.
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e R A RX SCRAM OCCURRED ON HIGH RX WATER LEVEL DUE TO AN EXCESSIVE FEEDWATER DEMAND TRANSIENT. THE CAUSE WAS A PERRY 12/15/01 440 3 4402001005 38575 OPERATE AUTO FAILED LOGIC CARD IN THE FEEDWATER LEVEL CONTROL SYSTEM.
THE REACTOR TRIPPED FOLLOWING LOAD REJECTION. THE LOAD REJECTION WAS CAUSED BY A SEVERE WINTER STORM. SNOW AND ICE BUILD-UP ON ACB-105 RESULTED IN A POWER LOSS TO THE PILGRIM 12/19/08 293 1 2932008006 44735 OPERATE AUTO SAFEGUARDS PANELS.
DURING A POWER REDUCTION TO BACKWASH THE MAIN CONDENSER, THE MAIN TURBINE TRIPPED RESULTING IN A SCRAM.
THE CAUSE OF THE TURBINE TRIP LOW CONDENSER VACUUM DUE TO A CALIBRATION ERROR OF THE LOW VACUUM TURBINE TRIP PILGRIM 07/10/07 293 1 2932007005 43479 OPERATE AUTO MECHANISM.
THE RX WAS MANUALLY SCRAMMED ON HIGH TEMPERATURE IN THE AUGMENTED OFFGAS SYSTEM RECOMBINER. THE CAUSE WAS PILGRIM 03/13/06 293 1 2932006001 42414 OPERATE MAN FAILURE OF THE CONTROLLER OF A PRESSURE CONTROL VALVE.
THE RX WAS MANUALLY SCRAMMED AFTER A RECIRC PUMP RUNBACK CAUSED CONFLICTING INDICATIONS THAT CORE FLOW COULD BE IN THE PROHIBITED REGION OF THE POWER TO FLOW MAP. A POST TRIP REVIEW FOUND THAT ACTUAL FLOW WAS PILGRIM 02/21/03 293 1 2932003001 39609 OPERATE MAN CONSERVATIVE.
A RX SCRAM OCCURRED ON MSIV CLOSURE RESULTING FROM SWELL AFTER THE MAIN TURBINE BYPASS VALVES WERE INADVERTENTLY OPENED AND DEPRESSURIZED THE RX VESSEL. THE CAUSE WAS OPERATOR ERROR WHEN THE SWITCH TO OPEN THE TURBINE PILGRIM 05/19/03 293 1 2932003002 39857 STARTUP AUTO BYPASS VALVES WAS OPERATED.
A RX SCRAM OCCURRED ON LOAD REJECT AFTER THE MAIN GENERATOR LOCKOUT RELAY TRIPPED. THE CAUSE WAS FAILURE OF A CONDUCTOR WITHIN THE LOW VOLTAGE PORTION OF THE UNIT PILGRIM 06/01/03 293 1 2932003003 39898 OPERATE AUTO AUXILIARY TRANSFORMER.
A SCRAM OCCURRED FROM THE TRIP OF BOTH RPS CHANNELS. ONE CHANNEL TRIPPED FROM A LOSS OF POWER DURING AN ELECTRICAL TOM AND ANDY DISCUSSED POTENTIAL EK SSA. DECIDED SURVEILLANCE AND THE OTHER FROM HIGH FLUX FOLLOWING A TRIP NOT SSA BECAUSE EDG OUTPUT BKR WAS SPECIFICALLY OF BOTH RECIRC MG SETS. THE CAUSE WAS AN INADEQUATE REMOVED FROM SERVICE AND SHOULD NOT HAVE PILGRIM 08/13/01 293 1 2932001006 38206 OPERATE AUTO SURVEILLANCE PROCEDURE. CLOSED.
A RX SCRAM OCCURRED ON AN AVERAGE POWER RANGE HI-HI TRIP AFTER BOTH RECIRCULATION MOTOR GENERATOR SETS TRIPPED.
THE MOST LIKELY CAUSE WAS A FAILED MICRO SWITCH IN AN PILGRIM 12/27/01 293 1 2932001007 38598 OPERATE AUTO ANALOG TRIP SYSTEM CALIBRATING UNIT.
WHILE PERFORMING CONDENSER FLOW REVERSAL TESTING, THE REACTOR TRIPPED FOLLOWING A MAIN TURBINE TRIP. THE TURBINE TRIPPED ON LOW CONDENSER VACUUM CAUSED BY THE FAILURE OF QUAD CITIES 1 08/12/10 254 3 2542010002 46169 OPERATE AUTO ONE OF THE FLOW REVERSAL VALVES TO FULLY REVERSE FLOW.
A RX SCRAM OCCURRED ON A TURBINE GENERATOR LOAD REJECT SIGNAL DUE TO A TRIP OF THE MAIN POWER TRANSFORMER PHASE DIFFERENTIAL OVERCURRENT RELAY. THE CAUSE WAS DEGRADED WIRING INSULATION RESULTING IN A GROUND IN THE CURRENT QUAD CITIES 1 02/22/06 254 3 2542006002 42356 OPERATE AUTO TRANSFORMER.
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e R A RX SCRAM OCCURRED ON HIGH PRESSURE FOLLOWING A FAILURE IN THE EHC SYSTEM WHICH RESULTED IN CLOSURE OF THE MAIN TURBINE CONTROL VALVES. THE CAUSE WAS A FAILURE IN ONE OF QUAD CITIES 1 06/17/05 254 3 2542005005 41782 OPERATE AUTO THE CONTROL VALVE INPUT CIRCUIT CARDS IN THE EHC SYSTEM.
A RX SCRAM OCCURRED ON LOW RX VESSEL WATER LEVEL WHEN A FEED WATER REGULATING VALVE LOCKED UP. THE CAUSE WAS AGE RELATED FAILURE OF A SOLDER JOINT ON THE MASTER CONTROLLER QUAD CITIES 1 12/06/00 254 3 2542000010 37573 OPERATE AUTO FOR THE FEED WATER REGULATING VALVE.
THE REACTOR WAS MANUALLY TRIPPED DUE TO INCREASING REACTOR WATER LEVEL. THE WATER LEVEL WAS INCREASING DUE TO A TRIP OF A REACTOR RECIRCULATION PUMP, WHICH WAS HAVING QUAD CITIES 2 08/17/10 265 3 2652010002 46184 OPERATE MAN ITS PROGRAMMABLE LOGIC CONTROLLER ADJUSTED.
THE REACTOR WAS MANUALLY TRIPPED AT 30% POWER DUE TO DECREASING CONDENSER VACUUM. THE CAUSE WAS FAILURE OF AN AUX STEAM TO OFFGAS CONTROLLER RESULTING IN DECREASED NONCONDENSIBLE GAS REMOVAL EFFICIENCY, WHICH CAUSED QUAD CITIES 2 02/28/07 265 3 2652007001 43198 OPERATE MAN INCREASED CONDENSER BACKPRESSURE.
A TURBINE TRIP/RX SCRAM OCCURRED DURING TURBINE THRUST BEARING WEAR DETECTOR TESTING. THE CAUSE WAS THE QUAD CITIES 2 03/30/04 265 3 2652004003 40625 OPERATE AUTO INAPPROPRIATE USE OF THE WRONG SURVEILLANCE PROCEDURE.
THE RX WAS MANUALLY SCRAMMED ON INCREASING TORUS TEMPERATURE AFTER THE "3B" MAIN STEAM RELIEF VALVE FAILED OPEN. THE CAUSE WAS EXCESSIVE LEAKAGE PAST THE PILOT VALVE QUAD CITIES 2 04/16/03 265 3 2652003002 39765 OPERATE MAN SEAT.
THE RX WAS MANUALLY SCRAMMED ON INCREASING RX WATER LEVEL. THE CAUSE WAS A BLOWN FUSE IN THE DIGITAL FEEDWATER LEVEL CONTROL SYSTEM RESULTING FROM INADVERTENT GROUNDING OF TEST LEADS DURING AN INSTRUMENT QUAD CITIES 2 04/05/02 265 3 2652002002 38833 OPERATE MAN SURVEILLANCE. THE ROOT CAUSE WAS EQUIP DESIGN.
A RX SCRAM OCCURRED WHEN A LIGHTNING STRIKE CAUSED A MAIN QUAD CITIES 2 08/02/01 265 3 2652001001 38181 OPERATE AUTO TRANSFORMER FAILURE AND A LOSS OF OFFSITE POWER.
A RX SCRAM OCCURRED DURING CALIBRATION OF MAIN STEAM LINE HIGH FLOW SWITCHES. A TECHNICIAN ADJUSTED A SWITCH THAT WAS NOT ISOLATED AND PREPARED FOR CALIBRATION, COMPLETING THE LOGIC FOR A GROUP I ISOLATION, WHICH RESULTED IN THE QUAD CITIES 2 05/05/00 265 3 2652000006 36976 OPERATE AUTO SCRAM. NO CHANGES PER REV 1.
A RX SCRAM OCCURRED ON HIGH FLUX WHILE RETURNING A TURBINE CONTROL VALVE TO SERVICE FOLLOWING CORRECTIVE MAINTENANCE. THE HIGH FLUX RESULTED FROM AN UNANTICIPATED RESPONSE OF THE CONTROL VALVES, MOST LIKELY QUAD CITIES 2 05/22/00 265 3 2652000007 37018 OPERATE AUTO RESULTING FROM AIR ENTRAPPED IN THE EHC SYSTEM.
A RX SCRAM RESULTED FROM A C-PHASE DIFFERENTIAL RELAY TRIP.
THE TRIP RESULTED FROM AN INSULATOR FAULT ON A 345 KV LINE CONNECTED TO THE STATION. BECAUSE OF DISTRIBUTION YARD CHANGES, INSUFFICIENT RELAY OPERATING MARGIN EXISTED QUAD CITIES 2 07/18/00 265 3 2652000008 37174 OPERATE AUTO DURING FAULTED CONDITIONS.
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e R WHILE SHUTTING DOWN THE REACTOR, THE RECIRC PUMPS WERE BEING TRANSFERRED FROM FAST TO SLOW. INSTEAD OF TRANSFERRING TO SLOW, THE RECIRC PUMPS TRIPPED AND THE RIVER BEND 09/20/09 458 4 4582009002 45369 OPERATE MAN OPERATOR INSERTED A MANUAL REACTOR TRIP.
THE REACTOR TRIPPED ON HIGH REACTOR PRESSURE. THE APPARENT CAUSE WAS A MALFUNCTION OF THE MAIN TURBINE CONTROL SYSTEM DUE TO A LOOSE, OIL-CONTAMINATED, RIVER BEND 03/05/08 458 4 4582008002 44034 OPERATE AUTO ELECTRICAL CONNECTOR.
THE REACTOR WAS MANUALLY TRIPPED FOLLOWING LOSS OF RIVER BEND 05/04/07 458 4 4582007002 43345 OPERATE MAN COOLING TO THE NO. 2 MAIN TRANSFORMER.
A REACTOR TRIP OCCURRED DURING AVERAGE POWER RANGE MONITOR SURVEILLANCE. THE TRIP WAS CAUSED WHEN THE GROUP 2 CONTROL RODS DROPPED UNEXPECTEDLY. AS THE REACTOR OPERATOR WAS RESPONDING TO THE DROPPED RODS, THE REACTOR RIVER BEND 09/26/07 458 4 4582007005 43668 OPERATE AUTO TRIPPED ON LOW WATER LEVEL.
THE REACTOR WAS MANUALLY SCRAMMED WHEN A FAULT ON A 480V SWITCHGEAR TRANSFORMER RESULTED IN LOSS OF THE "A" NON-SAFETY 13.8KV BUS, WHICH CAUSED THE CONDENSATE AND RIVER BEND 11/07/07 458 4 4582007006 43773 OPERATE MAN FEED PUMPS TO TRIP.
A RX TRIP OCCURRED ON HIGH APRM HEAT FLUX AFTER BOTH RECIRCULATION PUMPS DOWNSHIFTED TO SLOW SPEED. THE CAUSE WAS A FAILED OPTICAL ISOLATOR IN THE CONTROL CIRCUIT FOR THE RIVER BEND 04/15/06 458 4 4582006004 42505 OPERATE AUTO END OF CYCLE RECIRCULATION PUMP TRIP.
AN AUTOMATIC SCRAM OCCURRED FOLLOWING CLOSURE OF THE FEEDWATER ISOLATION VALVES. THE VALVES CLOSED WHEN THE RIVER BEND 10/19/06 458 4 4582006007 42921 OPERATE AUTO OPERATOR DROPPED A CHART RECORDER ON THEIR PUSHBUTTONS.
THE RX WAS MANUALLY SCRAMMED DUE TO INDICATIONS AND ALARMS OF A GENERATOR FIELD GROUND FAULT. ONE OF THE FIVE RECTIFIER BANKS IN THE GENERATOR EXCITATION CONTROL SYSTEM WAS THE SOURCE OF THE GROUND. THE CAUSE WAS DEPOSITION OF RIVER BEND 01/15/05 458 4 4582005001 41339 OPERATE MAN STATOR CORROSION PRODUCTS.
A RX SCRAM OCCURRED FOLLOWING A PARTIAL LOSS OF OFFSITE POWER. THE CAUSE WAS SLOW SWITCHYARD BREAKER OPERATION AND FAULT CLEARING TIME IN RESPONSE TO AN OFFSITE RIVER BEND 08/15/04 458 4 4582004001 40957 OPERATE AUTO TRANSMISSION LINE FAULT.
A MAIN GENERATOR/TURBINE TRIP AND RX SCRAM OCCURRED AS THE RESULT OF A SECOND INSULATOR FLASHOVER ON THE 230KV MAIN GENERATOR OUTPUT LINE. THE CAUSE WAS THE BUILDUP OF CONTAMINANTS ON SWITCHYARD INSULATORS OVER TIME DUE TO A LOSS OF ONE STATION SERVICE TRANSFORMER AND EDG RIVER BEND 10/01/04 458 4 4582004002 41082 OPERATE AUTO COOLING TOWER DRIFT. START OCCURRED 13 MINUTES PRIOR TO THE RX TRIP.
A SCRAM OCCURRED ON POWER TO FLOW FOLLOWING THE LOSS OF A VITAL INSTRUMENT BUS AND RESULTING LOSS OF FEEDWATER LEVEL CONTROL. THE CAUSE WAS A FAULT IN A NONSAFETY RELATED RIVER BEND 12/10/04 458 4 4582004005 41252 OPERATE AUTO VITAL INVERTER.
THE RX WAS MANUALLY TRIPPED ON A MAIN TURBINE ELECTRO HYDRAULIC CONTROL SYSTEM OIL LEAK. THE LEAK OCCURRED WHEN A SECTION OF HYDRAULIC TUBING NEAR THE MAIN TURBINE RIVER BEND 02/22/03 458 4 4582003001 39611 OPERATE MAN CONTROL VALVES DEVELOPED A THROUGH WALL CRACK. NO CHANGES FROM REV 00.
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e R A RX SCRAM OCCURRED ON HIGH RX PRESSURE DURING MAIN TURBINE CONTROL VALVE TESTING. THE CAUSE WAS ERRATIC SPEED SIGNALS POSSIBLY RESULTING FROM ELECTROSTATIC DISCHARGE IN RIVER BEND 09/22/03 458 4 4582003008 40191 OPERATE AUTO THE TURBINE THAT CAUSED THE CONTROL VALVES TO CLOSE.
A RX SCRAM OCCURRED ON HIGH NEUTRON FLUX AFTER THE MAIN TURBINE CONTROL VALVES CLOSED. THE MOST LIKELY CAUSE WAS A MOMENTARY GROUND CONDITION ON THE +22V TURBINE RIVER BEND 09/18/02 458 4 4582002001 39200 OPERATE AUTO ELECTROHYDRAULIC CONTROL SYSTEM BUS.
A RX SCRAM OCCURRED ON RX PRESSURE VESSEL HIGH PRESSURE RESULTING FROM CLOSURE OF THE MAIN TURBINE CONTROL VALVES DURING TURBINE CONTROL VALVE TESTING. THE LIKELY CAUSE WAS DETERMINED TO BE A TURBINE SPEED SIGNAL ERROR GENERATED RIVER BEND 04/21/01 458 4 4582001001 37939 OPERATE AUTO DURING TESTING.
THE RX WAS MANUALLY SCRAMMED IN RESPONSE TO DECREASING MAIN CONDENSER VACUUM, WHICH OCCURRED WHILE RESPONDING TO A LOW FLOW CONDITION IN THE OFFGAS SYSTEM. THE CAUSE RIVER BEND 08/21/00 458 4 4582000012 37244 OPERATE MAN WAS AN INADEQUATE OFFGAS ALARM RESPONSE PROCEDURE.
THE REACTOR TRIPPED DUE TO THE TURBINE STOP VALVES GOING CLOSED. THE STOP VALVE CLOSURE WAS DUE TO A COMMON MODE GINNA 12/30/09 244 1 2442009002 45597 OPERATE AUTO FAILURE OF BOTH EHC PUMPS.
THE REACTOR TRIPPED ON OVER-TEMPERATURE DIFFERENTIAL TEMPERATURE. THE CAUSE WAS A FAILURE OF THE TURBINE ELECTRO-HYDRAULIC CONTROLLER RESULTING IN RAPID CLOSURE OF THE REACTOR TRIPPED ON AN OVER-TEMPERATURE GINNA 01/27/07 244 1 2442007001 43128 OPERATE AUTO THE TURBINE CONTROL VALVES. DIFFERENTIAL TEMPERATURE SIGNAL.
THE PLANT TRIPPED WHEN LOW STEAM LINE PRESSURE RESULTED IN A SAFETY INJECTION SIGNAL, CAUSED BY THE SPURIOUS TRIP OF THE "B" MAIN STEAM LINE MSIV. THE LOW STEAM LINE PRESSURE RESULTED FROM THE "A" MSIV ATTEMPTING TO HANDLE FULL GINNA 03/16/07 244 1 2442007002 43243 OPERATE AUTO STEAM LOAD REQUIREMENTS.
A RX/TURBINE TRIP OCCURRED ON AN ATWS SIGNAL AFTER A POWER GINNA 02/16/05 244 1 2442005001 41414 OPERATE AUTO SUPPLY IN THE FEEDWATER CONTROL SYSTEM FAILED.
A RX TRIP OCCURRED ON OVER TEMPERATURE DELTA TEMPERATURE FOLLOWING A LOSS OF LOAD DURING A MAJOR GRID DISTURBANCE GINNA 08/14/03 244 1 2442003002 40068 OPERATE AUTO AND BLACKOUT.
THE RX WAS MANUALLY TRIPPED FOLLOWING A PARTIAL LOSS OF OFFSITE POWER AND LOSS OF THE "B" RCP ON UNDERVOLTAGE. THE GINNA 10/15/03 244 1 2442003005 40248 STARTUP MAN CAUSE WAS DAMAGE FROM A WINDSTORM.
THE RX WAS MANUALLY TRIPPED FOLLOWING THE LOSS OF A MAIN CIRCULATING WATER PUMP. THE PUMP TRIP WAS CAUSED BY THE GINNA 02/05/02 244 1 2442002001 38670 OPERATE MAN FAILURE OF A MOTOR FIELD WIRE.
THE RX WAS MANUALLY TRIPPED FOLLOWING A CONDENSER CIRCULATING WATER PUMP TRIP. THE CAUSE WAS FAILURE OF THE EXCITATION VOLTAGE TRANSFORMER WHICH RESULTED IN LOSS OF GINNA 10/21/00 244 1 2442000005 37446 OPERATE MAN EXCITATION FIELD TO THE PUMP MOTOR.
THE REACTOR TRIPPED FOLLOWING A TRIP OF THE MAIN TURBINE.
THE CAUSE OF THE TURBINE TRIP WAS FAULT ON A MANUALLY-OPERATED DISCONNECT SWITCH, WHICH RESULTED IN A 345KV BUS SEABROOK 01/19/08 443 1 4432008001 43921 OPERATE AUTO LOCKOUT.
REACTOR WAS MANUALLY SCRAMMED AT 17% POWER DURING SRARTUP. FOLLOWING A TURBINE TRIP CAUSED BY HIGH MANUAL SCRAM AT 17% DURING STARTUP, DUE TO MAIN SEABROOK 05/01/05 443 1 4432005006 41655 OPERATE MAN VIBRATIONS. TURBINE HIGH VIBRATIONS.
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e R A RX TRIP OCCURRED ON LOW SG WATER LEVEL FOLLOWING A PARTIAL LOSS OF FEED AFTER THE "A" MFP CONTROL VALVES CLOSED AND THE PUMP COASTED DOWN. THE CAUSE WAS A FAILED CIRCUIT SEABROOK 10/31/03 443 1 4432003002 40286 OPERATE AUTO BOARD IN THE MFP GOVERNOR SPEED CONTROL.
A RX TRIP OCCURRED ON HIGH POWER RANGE NEGATIVE FLUX RATE FOLLOWING A LOSS OF OFFSITE POWER. THE LOOP RESULTED WHEN SNOW BUILDUP ON A 345 KV TRANSMISSION LINE BUSHING CAUSED SEABROOK 03/05/01 443 1 4432001002 37810 OPERATE AUTO A FLASHOVER TO GROUND.
A RX TRIP OCCURRED ON HIGH NEGATIVE FLUX RATE WHEN A ROD DROPPED DURING ROD OPERABILITY CHECKS. THE CAUSE WAS PARTICULATE DEPOSITS IN THE ROD DRIVE HOUSING AND/OR ON THE DRIVE ROD. THESE DEPOSITS INHIBITED THE STATIONARY SEABROOK 10/15/01 443 1 4432001003 38390 OPERATE AUTO GRIPPER ENGAGEMENT.
THE RX WAS MANUALLY TRIPPED ON LOWERING SG LEVELS FOLLOWING A MAIN FEED PUMP TRIP AND RX SETBACK. THE PUMP TRIP RESULTED FROM A DEGRADED CIRCUIT BOARD IN THE SOLID STATE PROTECTION SYSTEM, WHICH CAUSED A MOMENTARY HIGH-SEABROOK 06/26/00 443 1 4432000004 37117 OPERATE MAN HIGH SG LEVEL SIGNAL.
THE REACTOR WAS MANUALLY TRIPPED DUE TO AN UNISOLABLE LEAK IN THE STEAM EXTRACTION SYSTEM. THE STEAM LEAK WAS SUSQUEHANNA 1 01/25/11 387 1 3872011002 46569 OPERATE MAN ISOLATED AFTER THE TURBINE WAS TRIPPED.
THE REACTOR AUTOMATICALLY TRIPPED AT 32% POWER DURING TESTING OF THE INTEGRATED FEEDWATER CONTROL SYSTEM. THE SUSQUEHANNA 1 04/22/10 387 1 3872010002 45866 OPERATE AUTO REACTOR TRIPPED ON LOW WATER LEVEL.
THE REACTOR TRIPPED ON HIGH WATER LEVEL DURING TESTING OF SUSQUEHANNA 1 05/14/10 387 1 3872010002 45930 OPERATE AUTO THE INTEGRATED FEEDWATER CONTROL SYSTEM.
THE REACTOR WAS MANUALLY TRIPPED DUE TO AN UNISOLABLE LEAK IN THE CIRC WATER SYSTEM NEAR THE MAIN CONDENSER AREA. POWER WAS INITIALLY REDUCED TO 39% WHEN THE REACTOR WAS TRIPPED DUE DUE TO RISING WATER LEVEL IN THE CONDENSER SUSQUEHANNA 1 07/16/10 387 1 3872010003 46103 OPERATE MAN AREA.
A RX SCRAM OCCURRED ON AN APPARENT NEUTRON MONITORING TRIP WHILE TRANSFERRING RPS POWER SUPPLIES. THIS EVENT WAS CAUSED BY A DESIGN DEFICIENCY IN THE NEWLY INSTALLED POWER SUSQUEHANNA 1 06/15/06 387 1 3872006004 42642 OPERATE AUTO RANGE NEUTRON MONITORING SYSTEM.
THE REACTOR TRIPPED AUTOMATICALLY FOLLOWING A TURBINE TRIP. THE APPARENT CAUSE WAS IMPROPER SETTINGS OF THE CURRENT COMPENSATOR IN THE GENERATOR AUTOMATIC VOLTAGE SUSQUEHANNA 1 11/25/06 387 1 3872006006 43011 OPERATE AUTO REGULATOR.
THE RX WAS MANUALLY SCRAMMED ON MAIN TURBINE HIGH VIBRATION DURING STARTUP TURBINE TESTING FOLLOWING TURBINE REPLACEMENT. THE CAUSE WAS INADEQUATE PLANS TO SUSQUEHANNA 1 04/21/04 387 1 3872004003 OPERATE MAN DEAL WITH DEVELOPING CONDITIONS.
A RX SCRAM OCCURRED ON LOW RX VESSEL LEVEL AFTER A FEED PUMP TRIPPED DURING FEED PUMP TESTING. THE CAUSE WAS SUSQUEHANNA 1 09/24/03 387 1 3872003006 40196 OPERATE AUTO PERSONNEL ERROR DURING THE TESTING.
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e R THE RX WAS MANUALLY SCRAMMED FOLLOWING A SINGLE RECIRCULATION PUMP TRIP WHEN CORE FLOW INDICATIONS PLACED THE UNIT IN AN UNANTICIPATED LOCATION ON THE POWER TO FLOW MAP. THE CAUSE WAS A HIGH RESISTANCE CONNECTION ON SUSQUEHANNA 1 04/22/02 387 1 3872002004 38870 OPERATE MAN THE RECIRCULATION MG SET EXCITER.
A RX SCRAM OCCURRED ON A LOAD REJECTION. THE MAIN GENERATOR EXCITATION SYSTEM HAD FAILED TO POSITIVELY RESPOND TO CHANGES TO THE OFFSITE GRID WHICH RESULTED IN A SUSQUEHANNA 2 06/06/05 388 1 3882005005 41746 OPERATE AUTO LOSS OF GENERATOR FIELD CAUSING THE LOCKOUT.
WHILE SHUTTING DOWN FROM 100% POWER DUE TO LOSS OF COOLING TO THE B MAIN TRANSFORMER, REACTOR WAS MANUALLY SUSQUEHANNA 2 04/28/05 388 1 3882005003 41646 OPERATE MAN SCRAMMED AT 75% POWER.
THE RX WAS MANUALLY SCRAMMED WHEN THE RX RECIRCULATION PUMPS TRIPPED. THE CAUSE WAS A LOSS OF POWER DURING A FIRE AT STARTUP TRANSFORMER "T-20" RESULTING FROM AN INTERNAL SUSQUEHANNA 2 10/03/02 388 1 3872002006 39242 STARTUP MAN FAULT.
A TURBINE TRIP/RX SCRAM OCCURRED ON LOW CONDENSER VACUUM AFTER THE OFFGAS SYSTEM ISOLATED. THE CAUSE WAS A MOMENTARY LOSS OF 120 VAC POWER WHEN INADEQUATE WORK INSTRUCTIONS CAUSED PLANT ELECTRICIANS TO INAPPROPRIATELY SUSQUEHANNA 2 09/30/02 388 1 3882002004 39233 OPERATE AUTO CLOSE A BREAKER.
THE REACTOR TRIPPED FOLLOWING A MAIN TURBINE/GENERATOR TRIP. THE GENERATOR TRIPPED DUE TO LOSS OF THE MAIN POWER TRANSFORMER. FAILURE OF THE TRANSFORMER WAS DUE TO THE SALEM 1 07/07/10 272 1 2722010002 46075 OPERATE AUTO INADVERTENT ACTUATION OF THE TRANSFORMER DELUGE SYSTEM.
THE REACTOR TRIPPED FOLLOWING A TURBINE TRIP. THE TURBINE TRIPPED SHORTLY AFTER LOWERING THE REACTIVE LOADING ON THE VOLTAGE REGULATOR. THE CAUSE OF THE TURBINE TRIP WAS THE LOSS OF A FIELD RELAY, WHICH PROVIDES LOSS OF EXCITATION SALEM 1 10/15/10 272 1 2722010005 46336 OPERATE AUTO PROTECTION.
THE REACTOR WAS MANUALLY TRIPPED DUE TO LOSS OF CIRCULATING WATER. CIRC WATER WAS LOST DUE TO HEAVY SALEM 1 04/24/07 272 1 2722007002 43317 OPERATE MAN GRASSING AT THE CIRCULATION WATER INTAKE.
THE REACTOR WAS MANUALLY TRIPPED FOLLOWING A LOSS OF CIRCULATING WATER. THE LOSS OF CIRC WATER WAS CAUSED BY GRASS INTRUSION INTO THE CIRCULATING WATER INTAKE SALEM 1 04/30/07 272 1 2722007002 43329 OPERATE MAN STRUCTURE.
THE REACTOR TRIPPED ON LOW FLOW FOLLOWING FAILURE OF THE 12 STATION POWER TRANSFORMER, WHICH RESULTED IN THE LOSS SALEM 1 12/28/07 272 1 2722007003 43873 OPERATE AUTO OF RCPS 13 AND 14.
A TURBINE/RX TRIP OCCURRED ON A SPURIOUS TURBINE OVERSPEED SIGNAL. THE MOST PROBABLE CAUSE WAS ELECTRO MAGNETIC SALEM 1 03/08/06 272 1 2722006001 42395 OPERATE AUTO INTERFERENCE BY AN UNKNOWN SOURCE.
A TURBINE/RX TRIP OCCURRED FOLLOWING ACTUATION OF 500KV 1-5 BREAKER WHICH ISOLATED THE GENERATOR. THE CAUSE WAS FAILURE OF THE BREAKERS CURRENT TRANSFORMER CONTROL SALEM 1 07/29/03 272 1 2722003002 40030 OPERATE AUTO CABLE CONDUCTORS.
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e R THE RX WAS MANUALLY TRIPPED ON LOW SG LEVEL FOLLOWING A FEEDPUMP RUNBACK. THE CAUSE WAS A VOLTAGE DECREASE IN THE CONTROL POWER TO ITS GOVERNOR WHEN A TECHNICIAN INADVERTENTLY GROUNDED THE POWER CIRCUIT FOR A VALVE LIMIT SALEM 1 11/12/02 272 1 2722002004 39364 OPERATE MAN SWITCH DURING TROUBLESHOOTING.
A TURBINE/RX TRIP OCCURRED ON A GENERATOR LOCKOUT RESULTING FROM A GENERATOR DIFFERENTIAL CURRENT RELAY TRIP. THE CAUSE WAS A DEGRADED TERMINATION ASSOCIATED SALEM 1 05/22/01 272 1 2722001006 38021 OPERATE AUTO WITH A GENERATOR NEUTRAL CURRENT TRANSFORMER.
THE RX WAS MANUALLY TRIPPED ON LOSS OF CONDENSER VACUUM.
THREE OF SIX CIRC WATER PUMPS LOST POWER DURING AN ELECTRICAL TRANSIENT. THE REACTOR WAS SCRAMMED AFTER A SALEM 1 09/24/01 272 1 2722001008 38313 OPERATE MAN FOURTH PUMP TRIPPED ON HIGH TRAVELING SCREEN D/P.
THE RX WAS MANUALLY TRIPPED FOLLOWING A LOSS OF CONDENSATE FLOW. THE CAUSE WAS ISOLATION OF THE LOW PRESSURE FEEDWATER HEATER STRINGS DUE TO RADIO FREQUENCY SALEM 1 01/06/00 272 1 2722000001 36567 OPERATE MAN INTERFERENCE.
THE RX WAS MANUALLY TRIPPED DUE TO RAPIDLY DECREASING GENERATOR OUTPUT. THE CAUSE WAS A MOMENTARY VOLTAGE SALEM 1 04/12/00 272 1 2722000002 36882 OPERATE MAN LOSS IN THE EHC CIRCUITRY WHILE REPLACING A CIRCUIT CARD.
A RX TRIP OCCURRED ON HIGH NEGATIVE FLUX RATE WHEN A GROUP OF CONTROL RODS INSERTED INTO THE CORE. THE CAUSE WAS A SALEM 1 08/09/00 272 1 2722000003 37218 OPERATE AUTO FAILED CIRCUIT CARD IN THE ROD CONTROL SYSTEM.
A TURBINE/RX TRIP OCCURRED ON LOW SG WATER LEVEL FOLLOWING CLOSURE OF THE FEEDWATER REGULATING VALVES. THE VALVE CLOSURES RESULTED FROM A FAILED OUTPUT DRIVER CIRCUIT SALEM 1 12/08/00 272 1 2722000005 37579 OPERATE AUTO CARD IN THE SOLID STATE PROTECTION SYSTEM.
THE REACTOR WAS MANUALLY TRIPPED DUE TO THE LOSS OF FOUR OF THE SIX CIRC WATER PUMPS DUE TO EXCESSIVE UPTAKE OF RIVER SALEM 2 01/03/10 311 1 3112010001 45604 OPERATE MAN ICE.
FOLLOWING A FEEDWATER PUMP TRIP AND TURBINE RUNBACK, THE REACTOR AUTOMATICALLY TRIPPED ON LOW STEAM GENERATOR LEVEL. THE CAUSE OF THE PUMP TRIP WAS AN INTERNAL WIRING SALEM 2 01/21/10 311 1 3112010002 45647 OPERATE AUTO SHORT.
THE REACTOR TRIPPED DUE TO A 4-KV GROUP BUS UNDERVOLTAGE.
WHILE RESTORING THE VOLTAGE REGULATOR TO AUTOMATIC FOLLOWING A SWAP TO MANUAL, THE REACTOR TRIPPED AFTER THE REACTOR TRIPPED DUE TO 4-KV BUS UNDERVOLTAGE SALEM 2 10/17/10 311 1 3112010003 46337 OPERATE AUTO RETURNING THE REGULATOR TO AUTOMATIC. ON THE BUSES SUPPLYING THREE OF THE RCPS.
LOSS OF THE TRAVELING SCREENS RESULTED IN LOSS OF CIRCULATING WATER. WHILE POWER WAS BEING REDUCED HIGH SG LEVEL RESULTED IN A MANUAL SCRAM. THE CAUSE OF THE HIGH SG LEVEL WAS THE FEED REG VALVE SWITCHING TO MANUAL DUE TO SALEM 2 05/09/08 311 1 3112008002 44195 OPERATE MAN THE STEAM FLOW SIGNAL SPIKING LO 59
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e R A BREACH IN THE CONDENSATE SYSTEM RESULTED IN LOW FEED PUMP SUCTION PRESSURE, WHICH RESULTED IN A LOW STEAM GENERATOR LEVEL REACTOR TRIP. THIS EVENT WAS THE RESULT OF SALEM 2 05/24/07 311 1 3112007002 43382 OPERATE AUTO FAILURE OF A SIGHT GLASS IN THE CONDENSATE DEMINERALIZER, THE FEED REG VALVES CLOSED DUE TO A SPURIOUS FEEDWATER INTERLOCK SIGNAL. THE CAUSE OF THE SPURIOUS SIGNAL WAS A FAULTY SOLID STATE PROTECTION SYSTEM OUTPUT CARD.
SUBSEQUENTLY, THE REACTOR TRIPPED ON LOW STEAM GENERATOR SALEM 2 08/06/07 311 1 3112007003 43550 OPERATE AUTO LEVEL.
THE REACTOR WAS MANUALLY SCRAMMED WHEN THE 21 RCP SEAL LEAK-OFF FLOW EXCEEDED THE PUMP TRIP CRITERIA. THE MOST PROBABLE CAUSE WAS OXYGEN INTRODUCED INTO THE RCS THAT CAUSED CORROSION PRODUCTS TO BECOME DISLODGED AND SALEM 2 09/26/06 311 1 3112006003 42864 OPERATE MAN DEPOSITED ONTO THE RCP SEALS.
A RX TRIP OCCURRED ON LOW SG WATER LEVEL AFTER A FEEDWATER REGULATING VALVE FAILED TO RESPOND. THE CAUSE WAS A FAILED SALEM 2 07/13/04 311 1 3112004006 40865 OPERATE AUTO VALVE POSITIONER.
THE RX WAS MANUALLY TRIPPED ON LOWERING SG WATER LEVEL WHEN A MAIN FEEDWATER REGULATING VALVE MALFUNCTIONED.
THE CAUSE WAS VALVE POSITIONER FAILURE DUE TO STICKING OF SALEM 2 07/15/04 311 1 3112004007 40875 OPERATE MAN THE POSITIONER PILOT STEM.
A TURBINE/RX TRIP OCCURRED ON GENERATOR DIFFERENTIAL CURRENT AND LOSS OF FIELD. THE CAUSE WAS A GENERATOR EXCITER BRUSH FAILURE RESULTING FROM INADEQUATE SALEM 2 09/09/04 311 1 3112004008 41028 OPERATE AUTO MAINTENANCE.
THE RX WAS MANUALLY TRIPPED IN RESPONSE TO LOSS OF CIRCULATING WATER PUMPS AND THE TRAVELING SCREENS. THE CAUSE WAS HEAVY GRASS AND DEBRIS INTRUSION FROM THE SALEM 2 03/29/03 311 1 3112003001 39713 OPERATE MAN DELAWARE RIVER.
THE RX WAS MANUALLY TRIPPED WHEN A ROD DROPPED DURING LOW POWER PHYSICS TESTING. THE CAUSE WAS A BLOWN FUSE ON SALEM 2 11/23/03 311 1 3112003003 40350 STARTUP MAN THE STATIONARY COIL RESULTING FROM INFANT MORTALITY.
A RX TRIP OCCURRED ON OVER TEMPERATURE DELTA TEMPERATURE AFTER A PZR SPRAY VALVE FAILED OPEN. THE CAUSE WAS CYCLIC FATIGUE FAILURE OF THE STANDOFF ARM PORTION OF THE VALVE SALEM 2 12/31/01 311 1 3112001008 38599 OPERATE AUTO POSITION FEEDBACK ASSEMBLY TO THE POSITIONER.
THE REACTOR WAS MANUALLY TRIPPED DUE TO A LARGE LEAK ON THE MAIN TURBINE SEAL OIL/LUBE OIL SYSTEM. THE CAUSE OF THIS EVENT WAS IMPROPER MAINTENANCE ON THE AIR SIDE SEAL OIL HARRIS 11/15/09 400 2 4002010002 45499 OPERATE MAN STRAINER.
WHILE SHUTTING DOWN DUE A DEGRADED CONDENSER BOOT SEAL, THE REACTOR WAS MANUALLY TRIPPED AT 21% POWER DUE TO HARRIS 08/11/08 400 2 4002008002 44404 OPERATE MAN INDICATIONS OF DEGRADED CONDENSER VACUUM.
WHILE REDUCING POWER FOR SHUTDOWN, THE STARTUP TRANSFORMER TRIPPED. THIS RESULTED IN A REACTOR TRIP ON RCP HARRIS 09/28/07 400 2 4002007003 43676 OPERATE AUTO UNDERFREQUENCY.
THE REACTOR TRIPPED AUTOMATICALLY WHEN THE MAIN TURBINE TRIPPED DUE TO A GENERATOR LOCKOUT SIGNAL. THE CAUSE OF THE LOCKOUT SIGNAL WAS SELF HEATING OF THE PROTECTIVE RELAY HARRIS 09/19/06 400 2 4002006003 42848 OPERATE AUTO MODULE.
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e R MANUALLY TRIPPED REACTOR FROM 100% FOLLOWING AN AUTOMATIC TRIP OF AN OPERATING CONDENSATE PUMP.
HARRIS 05/01/05 400 2 4002005002 41654 OPERATE MAN CONDENSATE PUMP B FAILED DUE TO A MOTOR SHAFT SHEAR.
A RX TRIP OCCURRED ON POWER RANGE NEGATIVE FLUX RATE TRIP SIGNAL AFTER FOUR RODS INSERTED INTO THE CORE. THE CAUSE HARRIS 05/06/04 400 2 4002004003 40730 OPERATE AUTO WAS A FAILED CARD IN THE CONTROL ROD DRIVE CABINET.
A TURBINE/RX TRIP OCCURRED ON A SPURIOUS TURBINE OVERSPEED SIGNAL. THE MOST LIKELY CAUSE WAS AN ELECTRICAL FAILURE OF HARRIS 05/18/03 400 2 4002003001 39856 OPERATE AUTO THE TURBINE OVERSPEED SENSING PROBE.
THE RX WAS MANUALLY TRIPPED AFTER LOSS OF A CONDENSATE BOOSTER PUMP RESULTED IN A TRIP OF THE OPERATING MAIN FEED PUMP. THE CAUSE WAS LOW OIL PRESSURE AFTER A RECENTLY REFURBISHED GEAR FAILED IN THE BOOSTER PUMPS VARIABLE SPEED HARRIS 05/20/03 400 2 4002003002 39864 OPERATE MAN FLUID COUPLING.
THE RX WAS MANUALLY TRIPPED IN RESPONSE TO A TRIP OF THE "B" MAIN FEEDWATER PUMP. THE CAUSE WAS A FAILED BISTABLE COMPARATOR CARD ASSOCIATED WITH THE FEEDWATER FLOW HARRIS 06/14/03 400 2 4002003003 39938 OPERATE MAN CONTROL SYSTEM.
THE RX WAS MANUALLY TRIPPED IN RESPONSE TO THE TRIP OF A CONDENSATE PUMP AND SUBSEQUENT FEED PUMP TRIP. THE SUPPLY BREAKER TRIPPED ON INSTANTANEOUS OVERCURRENT WHEN A LIGHTNING VOLTAGE SURGE OVERCAME THE MOTOR HARRIS 08/17/03 400 2 4002003005 40084 OPERATE MAN WINDING INSULATION.
THE RX WAS MANUALLY TRIPPED ON LOW SG WATER LEVEL AFTER A FEEDWATER REGULATOR BYPASS VALVE FAILED SHUT. THE BYPASS VALVE'S I/P CONVERTOR FAILED DUE TO AN INTERNAL AIR HARRIS 01/02/02 400 2 4002002001 38604 OPERATE MAN BLOCKAGE.
THE RX WAS MANUALLY TRIPPED ON A MAIN TURBINE DIGITAL ELECTRIC HYDRAULIC CONTROL SYSTEM MALFUNCTION DURING INITIATION OF A DOWNPOWER FOR TESTING. THE CAUSE WAS A VOLTAGE/FREQUENCY UNIT FAILURE THAT RESULTED IN THE HARRIS 07/13/02 400 2 4002002002 39057 OPERATE MAN GOVERNOR VALVES GOING SHUT.
A RX TRIP OCCURRED ON LOW BUS VOLTAGE FOR TWO OF THREE RX COOLANT PUMPS. THE CAUSE WAS A SIGNIFICANT, SHORT-DURATION GRID DISTURBANCE GENERATED WHEN A FAULTED TRANSFORMER WAS ENERGIZED TO A 230 KV BUS APPROXIMATELY HARRIS 08/15/02 400 2 4002002003 39132 OPERATE AUTO TWENTY MILES OFFSITE.
THE RX WAS MANUALLY TRIPPED ON LOW SG LEVEL FOLLOWING THE INADVERTENT CLOSURE OF A MAIN FEEDWATER ISOLATION VALVE.
THE CAUSE WAS A RANDOM MANUFACTURING DEFECT OF A DIODE IN A SOLENOID VALVE FOR THE MAIN FEEDWATER ISOLATION VALVE HARRIS 06/20/00 400 2 4002000005 37097 OPERATE MAN ACTUATOR.
THE REACTOR WAS MANUALLY TRIPPED WHEN TWO CONTROL RODS DROPPED WITHIN A SHORT PERIOD. THE CAUSE OF THE CONTROL ROD DROPS WAS FAILURE OF UNDER-RATED POWER SWITCH ST. LUCIE 1 06/16/10 335 2 3352010006 46018 OPERATE MAN SNUBBING CAPACITORS.
THE RX WAS MANUALLY TRIPPED ON DECREASING SG WATER LEVEL DURING A STARTUP. THE CAUSE WAS FAILURE OF THE MAIN TURBINE VALVES TO LATCH WHICH RESULTED IN A FEEDWATER TRANSIENT ST. LUCIE 1 10/24/02 335 2 3352002002 39316 OPERATE MAN AND SUBSEQUENT FEEDPUMP TRIP.
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e R A RX TRIP OCCURRED ON LOW RX COOLANT FLOW FOLLOWING A RCP TRIP. THE MOST PROBABLE CAUSE WAS THE SPURIOUS ACTUATION ST. LUCIE 1 06/05/01 335 2 3352001007 38053 OPERATE AUTO OF A MOTOR PROTECTIVE RELAY DEVICE.
THE REACTOR WAS MANUALLY TRIPPED FOLLOWING A RAPID POWER REDUCTION DUE TO THE LIFTING OF A MOISTURE SEPARATOR ST. LUCIE 2 04/15/10 389 2 3892010002 45843 OPERATE MAN REHEATER RELIEF VALVE.
THE REACTOR WAS MANUALLY TRIPPED DUE TO LOWERING CONDENSER VACUUM. THE LOWERING VACUUM WAS CAUSED BY THE INGRESS OF ALGAE AND SEAWEED INTO THE CIRCULATING ST. LUCIE 2 04/01/09 389 2 3892009002 44952 OPERATE MAN WATER SYSTEM.
A MAIN FEEDWATER PUMP TRIPPED DUE TO LOSS OF A HEATER DRAIN PUMP. SUBSEQUENTLY, THE REACTOR WAS MANUALLY ST. LUCIE 2 06/04/08 389 2 3892008002 44268 OPERATE MAN TRIPPED DUE TO DECREASING STEAM GENERATOR LEVELS.
THE REACTOR WAS MANUALLY TRIPPED FLOWING LOSS OF A CONDENSATE PUMP AND THE SUBSEQUENT LOSS OF A MAIN FEEDWATER PUMP. THE PUMP FAILED DUE TO MOTOR LEADS OVERHEATING AND FAILING CAUSE BY UNDETECTED EPOXY RESIN ST. LUCIE 2 06/07/08 389 2 3892008003 44276 OPERATE MAN INTRODUCED TO THE CABLES DURING MANUFACTURING.
THE RX WAS MANUALLY TRIPPED ON A DEH LEAK ON THE NUMBER ST. LUCIE 2 06/15/06 389 2 3892006004 42647 OPERATE MAN ONE THROTTLE VALVE.
THE RX WAS MANUALLY TRIPPED ON DECREASING SG WATER LEVEL FOLLOWING A PARTIAL LOSS OF FEED. THE CAUSE WAS PERSONNEL ERROR WHEN AN INCORRECT BREAKER CUBICAL DOOR WAS OPENED AND A LOCKOUT RELAY SPURIOUSLY ACTUATED WHEN THE DOOR ST. LUCIE 2 08/11/05 389 2 3892005003 41911 OPERATE MAN WAS CLOSED.
THE RX WAS MANUALLY TRIPPED TO REMOVE A FAILING CONDENSATE PUMP FROM SERVICE. THE CAUSE WAS A FAILED MOTOR LEAD TERMINATION TO THE FIELD CABLE RESULTING FROM ST. LUCIE 2 12/25/04 389 2 3892004004 41293 OPERATE MAN INCORRECT ORIGINAL CONSTRUCTION.
THE RX WAS MANUALLY TRIPPED ON LOW SG WATER LEVEL AFTER THE ONLY OPERATING FEEDPUMP TRIPPED ON HIGH SG WATER LEVEL. THE CAUSE WAS FAILURE OF PERSONNEL TO CLOSE THE FEEDWATER REG VALVE BLOCK VALVES COMBINED WITH A ST. LUCIE 2 12/27/04 389 2 3892004005 41297 OPERATE MAN FEEDWATER CONTROL SYSTEM MALFUNCTION.
THE RX WAS MANUALLY TRIPPED ON DECREASING CONDENSER VACUUM. THE CAUSE WAS A CORROSION INDUCED THROUGH WALL HOLE IN THE STEAM JET AIR EJECTOR PIPING AND A DEGRADED "2A" HOGGER RESULTING FROM AN OUT OF CALIBRATION STEAM SUPPLY ST. LUCIE 2 04/01/03 389 2 3892003001 39720 OPERATE MAN PRESSURE GAGE.
A TURBINE/RX TRIP OCCURRED ON HIGH SG WATER LEVEL FOLLOWING A FEEDWATER TRANSIENT. THE STEM OF THE LOW POWER FEEDWATER REGULATING VALVE SEPARATED FROM THE VALVE WHICH CAUSED THE VALVE TO CLOSE WHILE STILL HAVING AN ST. LUCIE 2 06/11/03 389 2 3892003003 39917 OPERATE AUTO OPEN INDICATION.
THE RX WAS MANUALLY TRIPPED DUE TO A FAILING CONDENSATE PUMP BEARING. THE BEARING WAS HOT AND SMOKING. THE CAUSE WAS INADEQUATE LUBRICATION RESULTING FROM FAULTY PLANT ST. LUCIE 2 12/04/03 389 2 3892003004 40375 OPERATE MAN PROCEDURES.
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e R A RX TRIP OCCURRED ON LOSS OF GENERATOR FIELD CURRENT. THE CAUSE WAS FAILURE OF THE MAIN GENERATOR VOLTAGE ST. LUCIE 2 12/20/03 389 2 3892003005 40403 OPERATE AUTO REGULATOR CURRENT REGULATOR MODULE.
A RX TRIP OCCURRED WHEN BOTH CONTROL ELEMENT ASSEMBLY MG SET OUTPUT BREAKERS OPENED. THE CAUSE WAS FAILURE OF A CEA MG SET VOLTAGE REGULATOR RESULTING FROM LONG TERM ST. LUCIE 2 03/14/01 389 2 3892001001 37841 OPERATE AUTO HEAT RELATED DEGRADATION.
A MOISTURE SEPARATOR RELIEF VALVE LIFTED AND WOULD NOT RESEAT. AFTER THE TURBINE WAS TRIPPED, THE AUTOMATIC AND MANUAL S/G LEVEL CONTROL COULD NOT MAINTAIN S/G LEVEL. THE SEQUOYAH 1 11/16/10 327 2 3272010002 46424 OPERATE MAN REACTOR WAS THEN MANUALLY TRIPPED DUE TO LOW S/G LEVEL.
THE REACTOR WAS MANUALLY TRIPPED WHEN A FIRE WAS REPORTED IN THE MAIN GENERATOR BUS DUCT. POWER WAS REMOVED FROM THE BUS DUCT AND THE FIRE EXTINGUISHED USING SEQUOYAH 1 12/20/10 327 2 3272010003 46492 OPERATE MAN WATER.
LOSS OF POWER TO THE REACTOR COOLANT PUMPS RESULTED IN AN AUTOMATIC REACTOR TRIP. THE CAUSE OF THE POWER LOSS WAS LOSS OF COMMON SERVICE STATION TRANSFORMER C. THE CAUSE OF THE TRANSFORMER LOAA WAS A FAULT ON THE SECONDARY SIDE SEQUOYAH 1 03/26/09 327 2 3272009003 44934 OPERATE AUTO OF CSST D.
THE REACTOR WAS MANUALLY TRIPPED DUE TO LOSS OF CONDENSATE FLOW. THE LOSS OF CONDENSATE WAS CAUSED BY A MANUAL MAIN TURBINE TRIP IN RESPONSE TO A FAILED OPEN SEQUOYAH 1 04/28/09 327 2 3272009004 45029 OPERATE MAN MOISTURE SEPARATOR REHEATER RELIEF VALVE.
THE REACTOR WAS MANUALLY TRIPPED FOLLOWING FAILURE OF A FEEDWATER REGULATING VALVE. THE MFRV FAILED DUE TO A RUPTURED DIAPHRAGM CAUSED BY INSUFFICIENT TORQUE APPLIED SEQUOYAH 1 05/06/09 327 2 3272009005 45045 OPERATE MAN TO THE FASTENING SCREW.
DURING TESTING OF A STEAM GENERATOR PRESSURE CHANNEL, THE LOOP 3 MAIN FEED REG VALVE WENT CLOSED. THE REACTOR WAS SEQUOYAH 1 01/16/08 327 2 3272008001 43909 OPERATE MAN MANUALLY TRIPPED ON LOWERING STEAM GENERATOR LEVEL.
A TURBINE/RX TRIP OCCURRED ON LOW TURBINE AUTO STOP OIL PRESSURE. THE CAUSE WAS A FAILED GASKET RESULTING FROM IMPROPER MACHINING OF THE TURBINE FRONT PEDESTAL OIL PORTS SEQUOYAH 1 04/09/05 327 2 3272005001 41583 OPERATE AUTO DURING ORIGINAL MANUFACTURE.
A TURBINE/RX TRIP OCCURRED ON A MAIN GENERATOR ELECTRICAL FAULT. THE CAUSE WAS IMPROPER CABLE ABANDONMENT DURING A DESIGN CHANGE THAT RESULTED IN A GROUND AND GENERATOR SEQUOYAH 1 03/15/04 327 2 3272004001 40589 OPERATE AUTO PROTECTION RELAY ACTUATION.
THE RX WAS MANUALLY TRIPPED 20 SECONDS AFTER A LOSS OF LOAD WHEN THE GENERATOR TRIPPED DURING TESTING. THE CAUSE WAS AN ISOLATED TURBINE AUTO STOP OIL PRESSURE SWITCH RESULTING FROM INADEQUATE VALVE VERIFICATION AND SEQUOYAH 1 08/28/03 327 2 3272003001 40113 OPERATE MAN CONFIGURATION CONTROL.
A TURBINE TRIP/RX TRIP RESULTED FROM AN INVALID LOSS OF MAIN GENERATOR EXCITATION SIGNAL. BECAUSE OF A WIRING ERROR IN A RECENTLY INSTALLED DESIGN CHANGE, TWO PROTECTIVE RELAYS SEQUOYAH 1 03/21/00 327 2 3272000003 36819 OPERATE AUTO ACTUATED WHEN A LOSS OF EXCITATION DID NOT EXIST.
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e R A RX TRIP OCCURRED ON LOW SG LEVEL AFTER A MFP TRIPPED ON LOW CONTROL OIL PRESSURE. THE CAUSE WAS A FAILURE OF THE ASSOCIATED MAIN OIL PUMP. THE REMAINING MFP DID NOT PROVIDE SUFFICIENT FEEDWATER BECAUSE OF AN INCORRECT SEQUOYAH 1 09/25/00 327 2 3272000004 37375 OPERATE AUTO TURBINE GOVERNOR ADJUSTMENT.
LOSS OF POWER TO THE REACTOR COOLANT PUMPS RESULTED IN AN AUTOMATIC REACTOR TRIP. THE CAUSE OF THE POWER LOSS WAS LOSS OF COMMON SERVICE STATION TRANSFORMER C. THE CAUSE OF THE TRANSFORMER LOSS WAS A FAULT ON THE SECONDARY SIDE SEQUOYAH 2 03/26/09 328 2 3272009003 44935 OPERATE AUTO OF CSST D.
DURING SEVERE WEATHER (A LIGHTNING STORM), THE REACTOR AUTOMATICALLY TRIPPED ON POWER RANGE HIGH NEGATIVE FLUX RATE. THE CAUSE OF THE SCRAM WAS LOSS OF A CONTROL ROD BANK DUE TO A HIGH VOLTAGE FLUCTUATION ON THE CONTROL ROD SEQUOYAH 2 05/27/09 328 2 3282009001 45097 OPERATE AUTO POWER CABLES.
THE REACTOR WAS MANUALLY TRIPPED DURING STARTUP WHEN THE RUNNING TURBINE-DRIVEN FEEDWATER PUMP BEGAN LOSING VACUUM. THE VACUUM LOSS WAS CAUSED BY CLOSED ISOLATION SEQUOYAH 2 11/26/09 328 2 3282009002 45520 OPERATE MAN VALVES ON A LEVEL SWITCH ON THE GLAND SEAL STEAM SYSTEM.
THE REACTOR WAS MANUALLY TRIPPED WHEN THE LOOP-4 FEEDWATER REG VALVE FAILED IN BOTH AUTOMATIC AND MANUAL SEQUOYAH 2 11/03/08 328 2 3282008001 44627 OPERATE MAN CONTROL MODES.
THE REACTOR TRIPPED FROM STEAM GENERATOR LOW LEVEL WHEN THE MAIN FEEDWATER REGULATING VALVE FAILED CLOSED. THE FEEDWATER REGULATING VALVE FAILED WHEN ITS AIR SUPPLY LINE SEVERED. THE AIR LINE HAD BEEN LEAKING AND REPAIR EFFORTS SEQUOYAH 2 01/23/07 328 2 3282007001 42115 OPERATE AUTO WERE UNDERWAY.
THE REACTOR WAS MANUALLY TRIPPED DUE TO A MAIN FEEDWATER PUMP TURBINE MALFUNCTION. THE PROBLEM WAS DETERMINED TO BE FAILURE OF A LOCAL/REMOTE SWITCH INTERNAL TO THE SPEED SEQUOYAH 2 03/13/07 328 2 3282007002 43233 OPERATE MAN INDICATING CONTROLLER.
A TURBINE/RX TRIP OCCURRED ON A MAIN GENERATOR NEUTRAL OVERVOLTAGE RELAY. AN ISOLATED PHASE BUS DUCT GASKET CAME LOOSE AND CAUSED A GROUND. THE ROOT CAUSE WAS INEFFECTIVE SEQUOYAH 2 03/22/06 328 2 3282006001 42444 OPERATE AUTO CORRECTIVE ACTION OF A PREVIOUS SIMILAR EVENT.
A RX TRIP OCCURRED ON LOW SG WATER LEVEL AFTER ALL FOUR FEEDWATER REGULATING VALVES CLOSED ON LOSS OF CONTROL POWER. A BREAKER WAS INADVERTENTLY OPENED DURING SEQUOYAH 2 02/23/05 328 2 3282005001 41437 OPERATE AUTO MAINTENANCE.
THE RX WAS MANUALLY TRIPPED AFTER A FEEDWATER PUMP TRIP AND UNIT RUNBACK. THE CAUSE WAS A SEQUENCE OF EVENTS RESULTING FROM THE "2B" HOTWELL PUMP TRIPPING ON NEUTRAL OVERCURRENT AND ACTION TO REPAIR THE NUMBER SEVEN HEATER SEQUOYAH 2 03/10/03 328 2 3282003004 39653 OPERATE MAN DRAIN TANK OUTLET VALVE.
A RX/TURBINE TRIP OCCURRED ON A SPURIOUS HIGH MAIN TURBINE VIBRATION SIGNAL DURING MAINTENANCE ON THE TURBINE VIBRATION DRAWER. THE CAUSE WAS A GROUND ON THE MAIN SEQUOYAH 2 04/12/03 328 2 3282003005 39753 OPERATE AUTO TURBINE VIBRATION DRAWER RESULTING FROM PINCHED WIRING.
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e R THE RX WAS MANUALLY TRIPPED FOLLOWING A CONTROL ROD SYSTEM URGENT FAILURE ALARM DURING LOW POWER PHYSICS TESTING. THE MOST LIKELY CAUSE WAS INTERMITTENT FAILURE OF SEQUOYAH 2 05/19/02 328 2 3282002002 38928 STARTUP MAN THE MULTIPLEXING RELAY IN THE ROD CONTROL SYSTEM.
A TURBINE/RX TRIP OCCURRED ON AN ACTUATION OF THE MAIN GENERATOR STATOR COOLING WATER FAILURE CIRCUIT. THE CAUSE WAS A RAW COOLING WATER ISOLATION VALVE FAILURE CAUSING LOW FLOW TO THE STATOR COOLING WATER SYSTEM HEAT SEQUOYAH 2 05/31/02 328 2 3282002003 38954 OPERATE AUTO EXCHANGER.
A RX TRIP OCCURRED ON RCP BUS UNDERVOLTAGE FOLLOWING THE LOSS OF A START BUS WHEN THE ALTERNATE FEEDER BREAKER ATTEMPTED TO CLOSE WHILE BEING RACKED INTO THE CONNECT POSITION. THE CAUSE WAS FAILURE OF THE BREAKER TO FUNCTION A FEEDWATER ISOLATION OCCURRED AND AFW STARTED SEQUOYAH 2 07/12/02 328 2 3272002004 39056 OPERATE AUTO PROPERLY. FOLLOWING THE RX TRIP.
A RX TRIP OCCURRED FOLLOWING A RCP TRIP. THE CAUSE WAS A SEQUOYAH 2 12/26/02 328 2 3282002004 39473 OPERATE AUTO GROUND ON THE RCP MOTOR WINDING.
A TURBINE TRIP/RX TRIP OCCURRED ON LOW SG WATER LEVEL. A LOSS OF VITAL INSTRUMENT POWER CAUSED A FEEDWATER REGULATING VALVE TO SHUT, RESULTING IN A LOSS OF FEEDWATER TO THE ASSOCIATED SG. THE CAUSE WAS A VITAL INVERTER SEQUOYAH 2 01/18/00 328 2 3282000001 36602 OPERATE AUTO CONTROL CIRCUIT FAILURE. NO CHANGES.
A TURBINE/RX TRIP OCCURRED DUE TO A SUDDEN PRESSURE RELAY ACTUATION ON ONE PHASE OF THE MAIN TRANSFORMER. THE CAUSE WAS A MAIN TRANSFORMER ELECTRICAL FAULT RESULTING SEQUOYAH 2 11/17/00 328 2 3282000004 37530 OPERATE AUTO FROM A FAILED 24 KV BUSHING.
THE REACTOR TRIPPED DUE TO LOSS OF CONDENSER VACUUM. THE LOSS OF CONDENSER VACUUM WAS CAUSED BY A MAIN CIRCULATING WATER GATE VALVE FAILING AT 45% DURING A HEAT SAN ONOFRE 2 09/13/09 361 4 3612009001 45347 OPERATE AUTO TREAT PROCESS.
DURING STATOR WATER LOW FLOW TESTING, A TURBINE TRIP AND SUBSEQUENT REACTOR TRIP OCCURRED DUE TO LOW COOLING SAN ONOFRE 2 06/05/08 361 4 3612008004 44273 OPERATE AUTO FLOW TO THE MAIN GENERATOR RECTIFIER.
FAILURE OF AN INSTRUMENT AIR BRAZED JOINT RESULTED IN LOSS OF STEAM GENERATOR LEVEL CONTROL. THE REACTOR AND MAIN FEED PUMPS WERE MANUALLY TRIPPED BECAUSE OF EXCESS FEED SAN ONOFRE 2 06/20/07 361 4 3612007001 43435 OPERATE MAN FLOW TO THE STEAM GENERATORS.
A TURBINE/RX TRIP OCCURRED ON A MAIN GENERATOR TRIP AFTER THE AUXILIARY TRANSFORMER TRIPPED ON HIGH DIFFERENTIAL CURRENT. THE MOST LIKELY CAUSE WAS AN INVALID SIGNAL INTRODUCED DURING DIFFERENTIAL RELAY TESTING, WHICH WAS IN SAN ONOFRE 2 02/03/05 361 4 3612005001 41368 OPERATE AUTO PROGRESS.
THE RX WAS MANUALLY TRIPPED FOLLOWING THE LOSS OF BOTH FEEDWATER PUMPS ON HIGH DISCHARGE PRESSURE WHEN A MAIN FEEDWATER REGULATING VALVE AND ASSOCIATED DISCHARGE VALVE BEGAN CLOSING. THE CAUSE WAS TWO CONCURRENT SAN ONOFRE 2 04/10/04 361 4 3612004002 40664 OPERATE MAN ELECTRICAL GROUNDS IN THE CONTROL SYSTEM.
A TURBINE/RX TRIP OCCURRED ON A MAIN GENERATOR TRIP.
SEVERAL VANES OF THE ISOPHASE BUS DUCT DE-IONZING FILTERS SAN ONOFRE 2 11/19/04 361 4 3612004004 41209 OPERATE AUTO FAILED (METAL FATIGUE) AND SHORTED THE "A" PHASE TO GROUND.
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e R A TURBINE/RX TRIP OCCURRED AFTER ACTUATION OF THE GENERATOR LOSS OF FIELD RELAY. THE CAUSE WAS AN INCORRECT CONNECTION TO THE FIELD SUPPRESSION RELAY FOR THE MAIN SAN ONOFRE 2 02/01/03 361 4 3612003001 39553 OPERATE AUTO GENERATOR DURING TESTING.
A RX TRIP OCCURRED ON LOW SG PRESSURE WHEN TWO ADDITIONAL STEAM DUMP VALVES UNEXPECTEDLY OPENED DURING A STARTUP. THE CAUSE WAS IMPROPER ADJUSTMENT OF THE STEAM BYPASS CONTROL SYSTEM DYNAMIC RESPONSE MODULE DUE TO AN SAN ONOFRE 2 06/30/02 361 4 3612002003 39032 OPERATE AUTO INADEQUATE PROCEDURE.
A RX TRIP OCCURRED ON LOW SG WATER LEVEL RESULTING FROM THE MOMENTARY CLOSURE OF A MAIN FEEDWATER REGULATING SAN ONOFRE 2 11/02/02 361 4 3612002006 39340 OPERATE AUTO VALVE WHEN A MAIN FEEDWATER CONTROLLER CARD FAILED.
THE RX WAS MANUALLY TRIPPED ON DECREASING PRIMARY SYSTEM PRESSURE WHEN THE PZR SPRAY VALVE FAILED TO 47% OPEN AND MECHANICALLY BOUND. THE CAUSE HAS NOT YET BEEN DETERMINED BUT TESTING AND OBSERVATION SUGGEST INTERNAL SAN ONOFRE 2 11/04/02 361 4 3612002007 39343 OPERATE MAN BINDING.
THE RX WAS MANUALLY TRIPPED FOLLOWING INTAKE STRUCTURE SAN ONOFRE 3 06/04/04 362 4 3622004001 40791 OPERATE MAN SEAWEED FOULING WHILE CONDITIONS CONTINUED TO DEGRADE.
A TURBINE/RX TRIP OCCURRED ON A LOSS OF OFFSITE POWER WHEN A BUS TRIPPED DURING SWITCHYARD MAINTENANCE AND TESTING.
THE CAUSE WAS PERSONNEL ERROR WHEN A NON-UTILITY TECHNICIAN PERFORMED WORK OUTSIDE THE AUTHORIZED SAN ONOFRE 3 02/27/02 362 4 3622002001 38730 OPERATE AUTO CLEARANCE BOUNDARY.
A RX TRIP OCCURRED DUE TO LOW RCP SPEED. THE CAUSE WAS A FAULTED FEEDER BREAKER, WHICH STARTED A FIRE WHILE SWITCHING OFFSITE POWER SOURCES. DURING THE SUBSEQUENT ELECTRIC PLANT SHIFT, THE RCP SUPPLY BUSES SLOW TRANSFERRED SAN ONOFRE 3 02/03/01 362 4 3622001001 37713 OPERATE AUTO TO A UNIT 2 AUX TRANSFORMER.
FOLLOWING A LOSS OF OFFSITE POWER DUE TO A TORNADO TOUCHING DOWN IN THE SWITCHYARD, UNIT ONE IS BEING SURRY 1 04/16/11 280 2 46761 OPERATE AUTO SUPPLIED POWER FROM THE 1EDG AND THE SBO DIESEL.
THE REACTOR TRIPPED ON STEAM FLOW/FEED FLOW MISMATCH.
THE EVENT WAS THE RESULT OF LOSS OF A VITAL 120VAC BUS. THE BUS LOSS WAS CAUSED BY THE FAILURE OF A UPS INVERTER WHICH OCCURRED WHILE THE BUS'S ALTERNATE POWER SOURCE WAS OUT SURRY 1 06/08/10 280 2 2802010003 45986 OPERATE AUTO OF SERVICE FOR MAINT.
DURING POWER RAMP UP AT 37% POWER MAIN TURBINE VIBRATIONS BECAME EXCESSIVE. WHILE DECREASING POWER FOR A RAPID LOAD REDUCTION, THE REACTOR WAS MANUALLY TRIPPED SURRY 1 04/20/08 280 2 2802008001 44152 OPERATE MAN DUE TO HIGH SUSTAINED VIBRATIONS.
THE RX WAS MANUALLY SCRAMMED ON HIGH RCP SHAFT VIBRATIONS ON "C" RCP FOLLOWED BY INCREASED LOWER RADIAL BEARING TEMPERATURES. THE CAUSE WAS A SLOW LOSS OF OIL IN THE RCP MOTOR LOWER OIL RESERVOIR AND RESULTING LOWER SURRY 1 01/14/03 280 2 2802003001 39507 OPERATE MAN RADIAL BEARING FAILURE.
A RX TRIP OCCURRED ON LOW SG WATER LEVEL DURING POWER ASCENSION WITH SG WATER LEVEL CONTROL IN MANUAL. THE SURRY 1 01/25/03 280 2 2802003002 39535 OPERATE AUTO CAUSE WAS INADEQUATE MODIFICATION OF THE FWRVS.
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e R THE RX WAS MANUALLY TRIPPED ON INDICATION OF A MISALIGNED ROD DURING PHYSICS TESTING. THE CAUSE WAS AN ELECTRICAL CONNECTOR PIN WHICH WAS PARTIALLY RECESSED AND NOT SURRY 1 06/13/03 280 2 2802003003 39932 STARTUP MAN MAKING A GOOD CONNECTION.
THE RX WAS MANUALLY TRIPPED AFTER A LOSS OF POWER TO TWO BUSES WHICH SUPPLY POWER TO ALL EIGHT CIRCULATING WATER PUMPS FOR BOTH UNITS. THE LOSS OCCURRED DURING HIGH WINDS SURRY 1 09/18/03 280 2 2802003004 40168 OPERATE MAN AND RAIN ASSOCIATED WITH HURRICANE ISABEL.
A RX TRIP OCCURRED ON LOW SG WATER LEVEL FOLLOWING A LOSS OF TURBINE LOAD. THE CAUSE WAS PERSONNEL ERROR WHEN WORK INTENDED FOR THE UNIT 2 EHC SYSTEM WAS PERFORMED ON THE SURRY 1 10/24/00 280 2 2802000004 37453 OPERATE AUTO UNIT 1 EHC SYSTEM.
THE REACTOR TRIPPED ON "LOOP C LOW FLOW." C LOOP RCS FLOW WAS INDICATING 25% ON ALL THREE CHANNELS. THE LOW FLOW CONDITION WAS CAUSED BY THE C LOOP STOP VALVE'S DISC ASSEMBLY SEPARATING FROM ITS STEM AND DROPPING INTO THE SURRY 2 02/02/11 281 2 2812011001 46584 OPERATE AUTO FLOW STREAM.
DURING STARTUP PHYSICS TESTING, THE REACTOR WAS MANUALLY TRIPPED WHEN A DISCREPENCY WAS IDENTIFIED BETWEEN THE SURRY 2 11/29/09 281 2 2812009001 45528 STARTUP MAN GROUP 1 AND GROUP 2 STEP DEMAND COUNTERS.
THE MAIN TURBINE SAFETY RELIEF VALVES LIFTED FOR UNKNOWN REASONS. THE OPERATOR THEN MANUALLY SCRAMMED THE REACTOR DUE TO S/G LEVEL FLUCTUATIONS AND UNUSUAL NOISE SURRY 2 10/07/06 281 2 2812006002 42888 OPERATE MAN COMING FROM THE TURBINE BUILDING.
A RX TRIP OCCURRED ON A MAIN GENERATOR DIFFERENTIAL LOCKOUT RELAY TRIP AFTER A MAIN GENERATOR OUTPUT LEAD COUPLING CAPACITOR VOLTAGE TRANSFORMER IN THE SWITCHYARD SURRY 2 05/21/04 281 2 2812004001 40769 OPERATE AUTO FAILED. THE CAUSE WAS AGE RELATED DEGRADATION.
A RX TRIP OCCURRED ON A MAIN GENERATOR TRIP DUE TO A DIFFERENTIAL LOCKOUT. THE CAUSE WAS A SHORTED MAIN GENERATOR CURRENT TRANSFORMER LEAD RESULTING WHEN A SURRY 2 01/25/03 281 2 2812003001 39536 OPERATE AUTO CONDUIT FITTING SEPARATED FROM A JUNCTION BOX.
THE RX WAS MANUALLY TRIPPED AFTER A LOSS OF POWER TO TWO BUSES WHICH SUPPLY POWER TO ALL EIGHT CIRCULATING WATER PUMPS FOR BOTH UNITS. THE LOSS OCCURRED DURING HIGH WINDS SURRY 2 09/18/03 281 2 2802003004 40168 OPERATE MAN AND RAIN ASSOCIATED WITH HURRICANE ISABEL.
A RX TRIP OCCURRED ON LOW SG WATER LEVEL AFTER ALL FOUR TURBINE GOVERNOR VALVES CLOSED DURING TURBINE VALVE TESTING. THE EVENT WAS CAUSED WHEN A TURBINE VALVE LIMITER FAILED TO ZERO DUE TO AN ELECTRICAL FAILURE IN THE SURRY 2 11/23/02 281 2 2812002003 39401 OPERATE AUTO ELECTROHYDRAULIC CONTROL CABINET.
THE REACTOR TRIPPED DUE TO A HUMAN ERROR WHILE PERFORMING SURVEILLANCE TESTING ON THE SOLID STATE SPURIOUS REACTOR TRIP DURING SSPS SURVEILLANCE SOUTH TEXAS 1 08/20/10 498 4 4982010003 46191 OPERATE AUTO PROTECTION SYSTEM. TESTING.
A RX TRIP OCCURRED ON HIGH SG WATER LEVEL FOLLOWING THE SOUTH TEXAS 1 01/23/04 498 4 4982004001 40473 OPERATE AUTO FAILURE OF A CLASS 1E 7.5 KV INVERTER.
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e R THE RX WAS MANUALLY TRIPPED ON DECREASING DEAERATOR LEVEL AFTER THE CONDENSATE POLISHING SERVICE VESSEL OUTLET VALVES AND THE SYSTEM BYPASS VALVE CLOSED, ISOLATING FLOW TO THE SOUTH TEXAS 1 03/01/03 498 4 4982003002 39629 OPERATE MAN DEAERATOR. THE CAUSE WAS A FAILED 24 VDC POWER SUPPLY.
THE RX WAS MANUALLY TRIPPED DUE TO A LOSS OF OPEN LOOP COOLING WHICH SUPPLIES AUXILIARY COOLING TO THE MAIN GENERATOR. A FOUR TO SIX INCH CRACK IN CIRCULATING WATER SOUTH TEXAS 1 11/16/02 498 4 39380 OPERATE MAN PUMP "11" WAS FOUND.
THE RX WAS MANUALLY TRIPPED AFTER ALL MAIN TURBINE GOVERNOR VALVES SHUT DURING PREPARATIONS FOR MONTHLY TURBINE VALVE TESTING. THE CAUSE WAS A FAILURE OF A LOGIC SOUTH TEXAS 1 12/16/00 498 4 4982000007 37608 OPERATE MAN CARD IN THE ANALOG ELECTRO-HYDRAULIC CONTROLLER.
THE STARTUP FEEDWATER PUMP BREAKER EXPLODED CAUSING AN UNDERVOLTAGE CONDITION ON THE 1H BUSES. THE REACTOR TRIPPED ON A REACTOR COOLANT PUMP UNDERVOLTAGE SOUTH TEXAS 2 11/03/10 499 4 4992010005 46387 OPERATE AUTO CONDITION.
THE RX WAS MANUALLY TRIPPED FOLLOWING THE CLOSURE OF A FEEDWATER ISOLATION VALVE DURING A PARTIAL STROKE SURVEILLANCE TEST OF THE VALVE. THE CAUSE WAS A SHORTED SOUTH TEXAS 2 06/14/02 499 4 4992002002 38991 OPERATE MAN SURGE SUPPRESSION DEVICE IN THE VALVES CONTROL CIRCUIT.
A TURBINE/RX TRIP OCCURRED ON HIGH SG WATER LEVEL FOLLOWING A LOSS OF POWER TO SG WATER LEVEL CONTROL SYSTEM. THE CAUSE WAS A VOLTAGE TRANSIENT RESULTING FROM A SOUTH TEXAS 2 07/07/02 499 4 4992002003 39045 OPERATE AUTO FAILED BREAKER. CHANGED DESCRPTION FIELD CAUSE SLIGHTLY PER REV. 1 THE RX WAS MANUALLY TRIPPED ON HIGH MAIN TURBINE VIBRATION. A BLADE HAD CRACKED AND BROKEN OFF AND WAS EJECTED FROM THE LOW PRESSURE TURBINE INTO THE CONDENSER.
ADDITIONAL CRACKED BLADES WERE FOUND. THE CAUSE WAS A CONDENSER VACUUM WAS SECURED AND MSIV'S SOUTH TEXAS 2 12/15/02 499 4 4992002004 39448 OPERATE MAN DESIGN FLAW WITH THE ROTOR TRAIN. ISOLATED TO REDUCE MAIN TURBINE SPEED QUICKER.
THE RX WAS MANUALLY TRIPPED FOLLOWING THE LOSS OF A RCP DURING AN ELECTRICAL BUS REALIGNMENT. SEVERAL BUSES WERE INADVERTENTLY DEENERGIZED BY OPERATOR ERROR DURING THE SOUTH TEXAS 2 02/07/01 499 4 4992001001 37726 OPERATE MAN BUS REALIGNMENT.
THE RX WAS MANUALLY TRIPPED DUE TO A FAILURE OF A SWITCHYARD BREAKER AND SUBSEQUENT LOSS OF ALL OPERATING CIRC WATER PUMPS. THE BREAKER'S LINKAGE MECHANISM FAILED WHEN A CONNECTION PIN FELL OUT. A REQUIRED BUSHING WAS SOUTH TEXAS 2 03/01/01 499 4 4992001002 37794 OPERATE MAN MISSING, PROBABLY SINCE FABRICATION.
A RX TRIP OCCURRED ON LOW SG WATER LEVEL WHEN A FEED WATER REGULATING VALVE WENT FULLY CLOSED DURING MAINTENANCE ON THE VALVES DIGITAL CONTROL SYSTEM. THE CAUSE WAS A TEST EQUIPMENT INDUCED GROUND PATH RESULTING SOUTH TEXAS 2 05/08/01 499 4 4992001004 37975 OPERATE AUTO FROM AN INADEQUATE WORK CONTROL PROCESS.
THE REACTOR TRIPPED FROM 100% POWER DURING TESTING ON THE DIGITAL TURBINE CONTROL SYSTEM. THE SCRAM OCCURRED FOLLOWING A TURBINE TRIP DUE TO AN INVALID LOW CONDENSER THREE MILE ISL 1 11/02/06 289 1 2892006002 42957 OPERATE AUTO VACUUM SIGNAL.
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e R A GRID DISTURBANCE RESULTED IN THE REACTOR PROTECTION SYSTEM AUTOMATICALLY TRIPPING THE REACTOR. THE POWER DISTURBANCE AFFECTED THE POWER TO THE REACTOR COOLANT PUMPS RESULTING IN THE REACTOR COOLANT PUMP POWER THREE MILE ISL 1 12/13/06 289 1 2892006003 43050 OPERATE AUTO MONITORS ACTUATING A REACTOR TRIP.
THE REACTOR WAS MANUALLY TRIPPED FOLLOWING A RAPID POWER REDUCTION DUE TO SODIUM LEVELS IN THE STEAM GENERATORS TURKEY POINT 3 03/06/11 250 2 46660 OPERATE MAN EXCEEDING THEIR LIMITS.
THE REACTOR TRIPPED DUE TO INADVERTENT ENERGIZATION OF THE GENERATOR TRIP. THE GENERATOR TRIP WAS CAUSED BY AN EXTERNAL ELECTRICAL FLASHOVER ON THE HIGH SIDE OF THE TURKEY POINT 3 09/23/10 250 2 2502010003 46274 OPERATE AUTO GENERATOR STEP UP TRANSFORMER.
WITH ONE CIRC WATER PUMP OUT FOR MAINTENANCE, ANOTHER CIRC WATER PUMP DEVELOPED AN OVERHEATED PACKING GLAND.
WITH ONLY TWO CIRC WATER PUMPS OPERABLE, THE OPERATORS TURKEY POINT 3 11/15/10 250 2 2502010006 46419 OPERATE MAN MANUALLY TRIPPED THE REACTOR.
A MOMENTARY POWER FLUCTUATION CAUSED BY GRID INSTABILITY TURKEY POINT 3 02/26/08 250 2 2502008001 44009 OPERATE AUTO CAUSED THE REACTOR TO TRIP.
THE RX WAS MANUALLY TRIPPED ON DECREASING SG WATER LEVEL.
LEVEL WAS RESTORED USING AUXILIARY AND MAIN FEED. THE ROOT CAUSE WAS POOR WORK INSTRUCTIONS, WHICH ALOWED THE FEEDWATER FLOW CONTROL VALVE POSITIONER TO BE INSTALLED TURKEY POINT 3 10/15/05 250 2 2502005005 42056 OPERATE MAN WITH SOME LOOSENESS.
THE RX WAS MANUALLY TRIPPED WHEN A FIRE BROKE OUT NEAR THE NUMBER TWO BEARING HOUSING ON THE HIGH PRESSURE TURBINE AND LASTED ABOUT FOUR MINUTES. THE CAUSE WAS A SEAL OIL LEAK RESULTING FROM POOR WORKMANSHIP DURING A TURKEY POINT 3 12/14/04 250 2 2502004006 41257 OPERATE MAN TURBINE SEAL OVERHAUL.
THE RX WAS MANUALLY TRIPPED WHEN TURBINE PLANT COOLING WATER LEAKAGE EXCEEDED THE MAKEUP CAPABILITY OF THE SURGE TURKEY POINT 3 12/28/04 250 2 2502004007 OPERATE MAN TANK. THE CAUSE WAS A FAILED GASKET.
THE RX WAS MANUALLY TRIPPED WHEN A ROD DROPPED DURING LOW POWER PHYSICS TESTING. THE CAUSE WAS INTERMITTENT CONTACT IN A PIN IN THE CRDM COIL STACK CONNECTOR ASSOCIATED WITH ROD E-11. THIS IS THE FIRST OF TWO SIMILAR TURKEY POINT 3 11/29/04 250 2 2502004004 41225 STARTUP MAN EVENTS.
THE RX WAS MANUALLY TRIPPED WHEN A ROD DROPPED DURING LOW POWER PHYSICS TESTING. THE CAUSE WAS INTERMITTENT CONTACT IN A PIN IN THE CRDM COIL STACK CONNECTOR ASSOCIATED WITH ROD E-11. THIS IS THE SECOND OF TWO SIMILAR TURKEY POINT 3 11/30/04 250 2 2502004004 41232 STARTUP MAN EVENTS.
THE RX WAS MANUALLY TRIPPED ON LOW SG WATER LEVEL FOLLOWING A LOSS OF INSTRUMENT AIR WHICH CAUSED THE AIR OPERATED MAIN FEEDWATER REGULATING VALVES TO DRIFT CLOSED. ONE COMPRESSOR WAS OUT OF SERVICE WHEN THE TURKEY POINT 3 01/27/03 250 2 2502003002 39538 OPERATE MAN MOTOR SEIZED ON THE OPERATING COMPRESSOR. NO CHANGES PER REV 1.
THE RX WAS MANUALLY TRIPPED ON A LOSS OF CONDENSER VACUUM DURING A LOAD REDUCTION. THE CAUSE WAS INADEQUATELY DESIGNED LINES FOR THE CONTROL ROOM CONDENSER VACUUM INSTRUMENTATION AND THE TURBINE LOW TURKEY POINT 3 08/15/01 250 2 2502001003 38209 OPERATE MAN VACUUM ALARM.
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e R THE REACTOR WAS MANUALLY TRIPPED ON HIGH STEAM GENERATOR LEVEL FOLLOWING A TURBINE RUNBACK. THE TURBINE RUNBACK WAS MANUALLY INITIATED BY STOPPING A STEAM TURKEY POINT 4 01/11/10 251 2 2512010002 45619 OPERATE MAN GENERATOR FEED PUMP DUE TO MECHANICAL SEAL FAILURE.
THE REACTOR TRIPPED DURING THE REPAIR OF A FAILED TURBINE STOP VALVE RELAY. DURING THE REPLACEMENT OF THE RELAY, THE RPS LOGIC WAS MET CAUSING A REACTOR TRIP AND A TURBINE TRIP.
THE ROOT CAUSE OF THE TRIP WAS DEFICIENCIES IN THE WORK TURKEY POINT 4 09/08/10 251 2 2512010004 46235 OPERATE AUTO PACKAGE.
THE REACTOR TRIPPED FROM 100% POWER DURING TESTING. THE CAUSE OF THE TRIP WAS A SPURIOUS PRESSURIZER PRESSURE TRIP SIGNAL WHEN THE OTHER CHANNEL WAS ALREADY TRIPPED FOR TURKEY POINT 4 09/21/10 251 2 2512010006 46265 OPERATE AUTO TESTING. THE REACTOR TRIPPED SPURIOUSLY DURING TESTING.
WITH THE REACTOR AT 100% POWER, A SHUTDOWN WAS COMMENCED DUE TO INDICATION OF A CONDENSER TUBE LEAK. THE REACTOR WAS MANUALLY TRIPPED AT 18% POWER DUE TO TURKEY POINT 4 12/09/10 251 2 2512010008 46471 OPERATE MAN INCREASING S/G SODIUM LEVELS, CAUSED BY THE TUBE LEAK.
A MOMENTARY POWER FLUCTUATION CAUSED BY GRID INSTABILITY TURKEY POINT 4 02/26/08 251 2 2502008001 44009 OPERATE AUTO CAUSED THE REACTOR TO TRIP.
DURING STARTUP, THE REACTOR WAS MANUALLY TRIPPED WHEN SG LEVEL BEGAN RISING UNCONTROLLABLY. THE CAUSE OF THE HIGH SG LEVEL WAS INSUFFICIENT GUIDANCE ON MAIN GENERATOR LOADING AND STABILIZING POWER WHILE SWITCHING TO AUTO FWRV TURKEY POINT 4 02/29/08 251 2 2512008001 44016 STARTUP MAN CONTROL.
THE RX WAS MANUALLY TRIPPED ON DECREASING SG WATER LEVEL AFTER A FEED PUMP TRIPPED. THE CAUSE WAS A FEEDWATER PUMP TURKEY POINT 4 03/22/05 251 2 2512005001 41511 OPERATE MAN MOTOR ELECTRICAL FAULT.
A TURBINE/RX TRIP OCCURRED DUE TO A FIRE IN THE MAIN TRANSFORMER. THE CAUSE WAS A SUDDEN INTERNAL FAULT ON THE "B" PHASE HIGH SIDE WINDING OF THE MAIN TRANSFORMER TURKEY POINT 4 06/27/05 251 2 2512005002 41800 OPERATE AUTO RESULTING FROM AN INADEQUATELY MANUFACTURED PART.
A RX SCRAM OCCURRED ON LOW SG WATER LEVEL FOLLOWING A FEED REGULATING VALVE CLOSURE. THE CAUSE WAS A CAPACITOR FAILURE IN THE FEEDWATER FLOW CONTROLLER WHICH CAUSED THE TURKEY POINT 4 05/14/04 251 2 2512004002 40752 OPERATE AUTO FEED REGULATING VALVE TO CLOSE.
THE RX WAS MANUALLY SCRAMMED ON DECREASING MAIN CONDENSER VACUUM. THE CAUSE WAS FAILURE OF A TURBINE SLOP DRAIN LINE INSIDE THE CONDENSER. THE CONDENSER CONTINUED TURKEY POINT 4 12/25/04 251 2 2512004004 41292 OPERATE MAN TO FUNCTION AS A HEAT SINK.
THE RX WAS MANUALLY TRIPPED DUE TO TWO DROPPED RODS IN DIFFERENT BANKS. THE CAUSE OF THE FIRST DROPPED ROD WAS AN OPEN GRIPPER CIRCUIT, THE CAUSE OF THE SECOND DROPPED ROD WAS HUMAN ERROR DURING TROUBLESHOOTING OF THE FIRST TURKEY POINT 4 01/25/01 251 2 2512001001 37691 OPERATE MAN DROPPED ROD.
THE RX WAS MANUALLY TRIPPED DUE TO FEEDWATER OSCILLATIONS. THE CAUSE WAS A FEEDWATER REGULATING VALVE FAILURE. BECAUSE OF INADEQUATE MAINTENANCE, THE VALVE TURKEY POINT 4 01/24/00 251 2 2512000001 36618 OPERATE MAN CAGE HAD DISENGAGED FROM THE VALVE BODY WEB.
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e R THE REACTOR TRIPPED FOLLOWING A TURBINE TRIP. THE CAUSE OF THE TURBINE TRIP WAS A MAIN GENERATOR STATOR GROUND. THE CAUSE OF THE STATOR GROUND WAS FAILURE OF THE "B" PHASE OF SUMMER 10/02/09 395 2 3952009002 45404 OPERATE AUTO THE MAIN GENERATOR OUTPUT BREAKER.
AT REDUCED POWER FOR MAINTENANCE, THE TURBINE WAS MANUALLY TRIPPED DUE TO HIGH VIBRATIONS. THE STEAM DUMP SYSTEM FAILED TO OPERATE. THIS REQUIRED THE OPERATORS TO MANUALLY TRIP THE REACTOR. THE CAUSE OF THE STEAM DUMP SUMMER 12/16/09 395 2 3952009004 45577 OPERATE MAN FAILURE WAS A FAILED CIRCUIT CARD.
THE REACTOR WAS MANUALLY TRIPPED DUE TO RAPIDLY DECREASING LEVEL IN THE "C" STEAM GENERATOR CAUSED BY FAILURE OF THE "C" FEEDWATER FLOW CONTROL VALVE POSITIONER SUMMER 01/24/08 395 2 3952008001 43932 OPERATE MAN PILOT VALVE.
WHEN STARTING THE D FEEDWATER BOOSTER PUMP, A STEAM LEAK DEVELOPED REQUIRING A MANUAL REACTOR SCRAM. THE LEAK WAS FROM AN ORIFICE IN THE D FEEDWATER BOOSTER PUMP SUMMER 02/05/07 395 2 3952007001 43141 OPERATE MAN RECIRCULATION HEADER.
A TURBINE/RX TRIP OCCURRED ON A LOSS OF FEED FOLLOWING A FIRE IN ONE CONDENSATE PUMP AND A DISCHARGE VALVE PROBLEM WITH THE OTHER THAT CAUSED A DEAERATOR STORAGE TANK LOW LEVEL. THE FIRE WAS CAUSED BY A PHASE TO GROUND SHORT IN THE SUMMER 08/25/05 395 2 3952005003 41946 OPERATE AUTO MOTOR WINDINGS.
A RX TRIP OCCURRED ON LOW SG WATER LEVEL WHEN A FEEDWATER REGULATING VALVE FAILED CLOSED DURING A CONTROLLED SHUTDOWN. THE CAUSE WAS SERVICE INDUCED SUMMER 03/30/04 395 2 3952004001 40628 OPERATE AUTO FRETTING ON THE POSITIONER PILOT VALVE STEM.
A TURBINE/RX TRIP OCCURRED ON OVER TEMPERATURE DELTA TEMPERATURE AFTER THE MAIN GENERATOR OUTPUT BREAKER OPENED. THE CAUSE WAS THE MAIN GENERATOR FIELD BREAKER POSITION SENSING CIRCUIT HAD DEGRADED CONTACTS RESULTING SUMMER 05/12/03 395 2 3952003002 39838 OPERATE AUTO FROM VIBRATION INDUCED WEAR.
A RX TRIP OCCURRED ON A SOURCE/INTERMEDIATE RANGE EXCORE NEUTRON FLUX DETECTOR CHANNEL SPIKE. THE CAUSE WAS EXCESSIVE NOISE IN THE INSTRUMENT CHANNEL PREAMPLIFIER SUMMER 06/01/02 395 2 3952002003 38958 STARTUP AUTO WHICH WAS CAUSED BY A FAULTY HIGH VOLTAGE POWER SUPPLY.
A RX TRIP OCCURRED ON LOW SG WATER LEVEL FOLLOWING A MAIN FEEDWATER PUMP TRIP. THE PUMP TRIP RESULTED FROM A BLOWN FUSE IN THE DIGITAL SPEED CONTROL SYSTEM. THE RX TRIP RESULTED FROM A DESIGN DEFICIENCY IN THE DIGITAL SPEED SUMMER 06/17/02 395 2 3952002004 39000 OPERATE AUTO CONTROL SYSTEM.
THE RX WAS MANUALLY TRIPPED WHEN TWO SHUTDOWN CONTROL RODS REMAINED FULLY INSERTED WHILE INITIATING CONTROL ROD WITHDRAWAL. THE CAUSE WAS ROD INSERTION BELOW ZERO STEPS IN CONJUNCTION WITH GEOMETRIC FACTORS WHICH RENDERED THE SUMMER 03/01/01 395 2 3952001003 37791 STARTUP MAN GRIPPERS UNABLE TO ENGAGE.
THE REACTOR TRIPPED ON A GENERATOR LOCKOUT DUE THE REACTOR TRIPPED FOLLOWING A GENERATOR LOCKOUT. THE TO DIFFERENTIAL CURRENT BETWEEN TWO CURRENT CAUSE OF THE LOCKOUT WAS IMPROPER RATIO SETTINGS ON A TRANSFORMERS. THE NEWLY INSTALLED SWITCHYARD CT VERMONT YANKEE 05/26/10 271 1 2712010001 45957 OPERATE AUTO NEWLY INSTALLED SWITCHYARD CURRENT TRANSFORMER. HAD IMPROPER RATIO SETTINGS.
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e R DURING SURVEILLANCE TESTING OF THE TURBINE STOP VALVE, THE VALVE CLOSED AND WOULD NOT OPEN. THE VALVE WAS OPENED WITH MECHANICAL ASSISTANCE. HOWEVER, A STOP VALVE CLOSURE VERMONT YANKEE 08/30/07 271 1 2712007003 43610 OPERATE AUTO SIGNAL WAS GENERATED, WHICH TRIPPED THE REACTOR.
A SCRAM OCCURRED ON A LOAD REJECT GENERATOR TRIP FOLLOWING A CATASTROPHIC FAILURE IN THE 345 KV SWITCHYARD.
THE CAUSE WAS A FAILED INSULATOR RESULTING IN FAILURE OF A VERMONT YANKEE 07/25/05 271 1 2712005001 41868 OPERATE AUTO MOTOR OPERATED 345 KV DISCONNECT SWITCH.
A RX SCRAM/GENERATOR TRIP OCCURRED AS A RESULT OF AN ISO-PHASE BUS DUCT TWO-PHASE ELECTRICAL FAULT AND RESULTING FIRE. THE CAUSE WAS INADEQUATE PREVENTATIVE MAINTENANCE ON PORTIONS OF THE ISO-PHASE BUS AND FAILURE TO MONITOR VERMONT YANKEE 06/18/04 271 1 2712004003 40827 OPERATE AUTO AGE RELATED DEGRADATI A RX SCRAM OCCURRED DURING TESTING WHEN A BACKUP SCRAM VALVE ACTUATED. THE CAUSE WAS A TRAIN B RPS AUX CONTACT WHICH FAILED IN THE TRIPPED POSITION, RESULTING IN AN INVISIBLE HALF SCRAM. TESTING OF THE A TRAIN COMPLETED THE VERMONT YANKEE 03/19/01 271 1 2712001001 37850 OPERATE AUTO BACKUP SCRAM VALVE LOGIC.
THE RX WAS MANUALLY SCRAMMED ON A LOSS OF CONDENSER VACUUM. AN ELECTRICAL SHORT OCCURED WHILE CHANGING AN AIR EJECTOR STEAM SUPPLY VALVE INDICATION LIGHT BULB, WHICH CAUSED THE VALVE TO SHUT. THE USE OF AN INCORRECT BULB VERMONT YANKEE 09/13/00 271 1 2712000004 37317 OPERATE MAN EXTRACTION TOOL CAUSED THE SHORT.
THE REACTOR TRIPPED FOLLOWING A TURBINE TRIP. THE CAUSE OF THE TURBINE TRIP WAS AN INTERMITTENT FAILURE OF A CIRCUIT WATTS BAR 1 05/21/10 390 2 3902010001 45944 OPERATE AUTO CARD IN THE TURBINE CONTROL SYSTEM.
THE REACTOR WAS MANUALLY TRIPPED WHEN COOLING WAS LOST TO THE A-PHASE MAIN BANK TRANSFORMER. THE CAUSE OF THE LOSS OF COOLING WAS THE FAILURE OF THE CONTROL POWER TRANSFORMER THAT SUPPLIES THE MAIN BANK TRANSFORMER WATTS BAR 1 11/14/10 390 2 46418 OPERATE MAN COOLING SYSTEM.
WHILE REDUCING POWER FOR SHUTDOWN, THE PLANT WAS MANUALLY SCRAMMED WHEN THE FEEDWATER SYSTEM ISOLATED WATTS BAR 1 08/07/08 390 2 3902008002 44388 OPERATE MAN DUE TO HIGH LEVELS IN THE LOW PRESSURE HEATER STRINGS.
THE REACTOR TRIPPED FOLLOWING A TURBINE TRIP. THE TURBINE TRIPPED DUE TO A PERSONNEL ERROR, WHICH CAUSED THE MAIN WATTS BAR 1 09/20/08 390 2 3902008004 44506 OPERATE AUTO GENERATOR EXCITER FIELD BREAKER TO TRIP.
THE RX WAS MANUALLY TRIPPED ON HIGH MAIN TURBINE VIBRATION. THIS EVENT WAS CAUSED BY A FRACTURED TURBINE WATTS BAR 1 05/30/06 390 2 3902006004 42610 OPERATE MAN BLADE ON THE LOW-PRESSURE TURBINE.
THE REACTOR SCRAMMED FOLLOWING A TRIP OF THE MAIN GENERATOR. THE CAUSE OF THE GENERATOR TRIP WAS A FAULT IN WATTS BAR 1 07/31/06 390 2 3902006005 42744 OPERATE AUTO THE AUTOMATIC EXCITATION CONTROL CIRCUITRY.
A TURBINE/RX TRIP OCCURRED ON AN INVALID TRIP SIGNAL WHILE PERSONNEL WERE TESTING THE "B" TRAIN RX TRIP BREAKER. THE CAUSE WAS A MULTIMETER INADVERTENTLY CONNECTED IN THE WATTS BAR 1 01/16/04 390 2 3902004001 40454 OPERATE AUTO OHMS POSITION WHICH ENERGIZED THE TURBINE TRIP BUS.
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e R THE RX WAS MANUALLY TRIPPED IN RESPONSE TO FOUR DROPPED RODS IN CONTROL BANK "B". THE CAUSE WAS A FAILED ROD WATTS BAR 1 09/19/04 390 2 3902004002 41054 OPERATE MAN CONTROL POWER CABINET CIRCUIT.
A TURBINE/RX TRIP OCCURRED ON A GENERATOR BACKUP RELAY ACTUATION AFTER A GROUND FAULT RESULTING FROM A BROKEN O-RING IN THE "C" PHASE MAIN TRANSFORMER'S HIGH SIDE BUSHING CAPACITANCE TAP CONNECTOR. THE CAUSE WAS AN INADEQUATE WATTS BAR 1 03/10/03 390 2 3902003001 39651 OPERATE AUTO MAINTENANCE PROCEDURE.
A TURBINE/RX TRIP OCCURRED FOLLOWING ACTUATION OF THE SUDDEN PRESSURE RELAY FOR THE THE MAIN TRANSFORMER. THE CAUSE WAS A WORKER BUMPING INTO THE BOX THAT HOUSES THE WATTS BAR 1 08/25/03 390 2 3902003003 40100 OPERATE AUTO RELAYS IN THE SWITCHYARD.
A TURBINE/RX TRIP OCCURRED FOLLOWING THE ACTUATION OF A MAIN TRANSFORMER DIFFERENTIAL ELECTRICAL RELAY. THE CAUSE WAS INADEQUATE WORK INSTRUCTION RESULTING IN A DEFICIENT CABLE SPLICE WHICH SUBSEQUENTLY SHORTED TO GROUND AND WATTS BAR 1 07/13/02 390 2 3902002003 39058 OPERATE AUTO ACTUATED THE DIFFERENTIAL REL THE RX WAS MANUALLY TRIPPED ON INCREASING CONDENSER PRESSURE RESULTING FROM REDUCED CONDENSER CIRCULATING WATER FLOW. THE CAUSE WAS COOLING TOWER FILL MATERIAL OBSTRUCTING THE CONDENSER CIRCULATING WATER PUMP WATTS BAR 1 06/29/01 390 2 3902001001 38107 OPERATE MAN SUCTION SCREENS.
THE RX WAS MANUALLY SCRAMMED ON DECREASING SG WATER LEVEL FOLLOWING THE CLOSURE OF A FEEDWATER REGULATING VALVE. THE CAUSE WAS THE LOSS OF A VITAL AC INVERTER WHEN A WATTS BAR 1 09/04/01 390 2 3902001002 38263 OPERATE MAN SENSING/CURRENT LIMITING CARD FAILED.
A TURBINE/RX TRIP OCCURRED ON AN INVALID AMSAC SIGNAL DURING CLEARANCE ACTIVITIES ASSOCIATED WITH A PLANT DESIGN CHANGE FOR THE TDAFW PUMP CONTROL INSTRUMENTATION. THE CAUSE WAS INADEQUATE INTERFACE REQUIREMENTS IN THE WATTS BAR 1 12/19/01 390 2 3902001004 38586 OPERATE AUTO PLANNING AND SCHEDULING OF WORK.
THE REACTOR TRIPPED ON LOW STEAM GENERATOR LEVEL FOLLOWING THE LOSS OF A MAIN FEEDWATER PUMP. THE PUMP WOLF CREEK 03/02/10 482 4 4822010005 45739 OPERATE AUTO FAILED DUE TO LOSS A 120V NON-SAFETY INSTRUMENT INVERTER.
DURING STARTUP, A MAIN FEEDWATER PUMP TRIPPED. THE OPERATOR MANUALLY TRIPPED THE REACTOR. THE CAUSE OF THE FEEDWATER PUMP TRIP WAS A FAILED SERVO IN THE MFW CONTROL WOLF CREEK 03/08/10 482 4 4822010006 45749 OPERATE MAN CIRCUITRY.
THE REACTOR TRIPPED ON LOW STEAM GENERATOR DURING PLANT STARTUP. A HIGH STEAM GENERATOR LEVEL INITIATED A FEEDWATER ISOLATION, WHICH RESULTED IN LOW STEAM WOLF CREEK 10/17/10 482 4 4822010012 46338 OPERATE AUTO GENERATOR LEVEL.
THE REACTOR TRIPPED AS A RESULT OF LOW STEAM GENERATOR LEVEL CAUSED BY A MAIN FEED REGULATING VALVE CLOSURE. THE VALVE CLOSURE WAS CAUSED BY BLOWN FUSES IN THE FRV WOLF CREEK 04/28/09 482 4 4822009001 45027 OPERATE AUTO CONTROLLERS.
THE REACTOR TRIPPED FOLLOWING A TURBINE TRIP AND MOMENTARY LOSS OF OFFSITE POWER. THE CAUSE OF THE TRIP WAS WOLF CREEK 08/19/09 482 4 4822009002 45278 OPERATE AUTO LOSS OF OFFSITE POWER DUE TO A LIGHTNING STRIKE.
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e R THE REACTOR WAS MANUALLY TRIPPED ON LOWERING S/G LEVEL CAUSED BY LOSS OF THE B MFW PUMP. THE MFW PUMP WAS LOST FOLLOWING LOSS OF THE B NON-VITAL 4160V BUSES DUE TO WOLF CREEK 03/17/08 482 4 4822008003 44072 OPERATE MAN TRANSFORMER FAILURE DURING MAINTENANCE.
A RX TRIP OCCURRED ON LOW SG WATER LEVEL AFTER A MAIN FEEDWATER REGULATING VALVE FAILED CLOSED. THE CAUSE WAS WOLF CREEK 02/13/04 482 4 4822004002 OPERATE AUTO SEPARATION OF THE VALVE PLUG FROM THE STEM.
A RX TRIP OCCURRED DURING TESTING OF THE "B" TRAIN SOLID STATE PROTECTION SYSTEM. THE TECHNICIANS MISSED A WOLF CREEK 08/22/04 482 4 4822004004 40974 OPERATE AUTO PROCEDURE STEP CAUSING THE TRIP.
A TURBINE/RX TRIP OCCURRED ON A SPURIOUS MAIN TURBINE HIGH WOLF CREEK 10/07/04 482 4 4822004005 41100 OPERATE AUTO VIBRATION SIGNAL RESULTING FROM A LIGHTNING STRIKE.
A RX TRIP OCCURRED ON LOSS OF POWER AFTER THE OPERATING CRD MG SETS OUTPUT BREAKER OPENED WHILE THE OTHER CRD MG SET WAS BEING PLACED BACK INTO SERVICE FOLLOWING WOLF CREEK 01/03/03 482 4 4822003001 39487 OPERATE AUTO MAINTENANCE. THE CAUSE WAS PERSONNEL ERROR.
A RX TRIP OCCURRED ON LOW SG WATER LEVEL FOLLOWING THE CLOSURE OF A FEEDWATER ISOLATION VALVE. THE CAUSE WAS A SPURIOUS SIGNAL FROM THE ENGINEERED SAFETY FEATURES WOLF CREEK 08/18/03 482 4 4822003003 40086 OPERATE AUTO ACTUATION SYSTEM FOR THE "B" SG.
A RX TRIP OCCURRED ON LOW SG WATER LEVEL WHEN A FEEDWATER REGULATING VALVE FAILED CLOSED AFTER BEING PLACED IN MANUAL FOR TESTING. THE CAUSE WAS THE FAILURE OF A MANUAL CONTROLLER CARD FOR THE FEEDWATER REGULATING WOLF CREEK 05/08/02 482 4 4822002003 38906 OPERATE AUTO VALVE.
A RX TRIP OCCURRED WHEN TWO RCPS TRIPPED DURING AN AUXILIARY TRANSFORMER FIRE. THE FIRE STARTED WHEN A WOLF CREEK 09/04/00 482 4 4822000003 37287 OPERATE AUTO SQUIRREL ENTERED THE TRANSFORMER.
THE REACTOR WAS MANUALLY TRIPPED WHEN A RELIEF VALVE ON THE MOISTURE SEPARATOR HEATER INADVERTENTLY OPENED AND WOULD NOT RECLOSE. THE REACTOR WAS TRIPPED PRIOR TO REACHING THE CONDENSATE PUMP TRIP LEVEL IN THE CONDENSER WATERFORD 3 10/19/09 382 4 3822009005 45445 OPERATE MAN HOTWELL.
THE RX WAS MANUALLY TRIPPED ON LOWERING MAIN CONDENSER VACUUM CAUSED BY A LOSS OF ALL CIRC WATER PUMPS. THE CAUSE WAS A DEGRADED TIMER RELAY IN THE CIRC WATER PUMP WATERFORD 3 11/11/05 382 4 3822005005 42138 OPERATE MAN DISCHARGE VALVE CONTROL CIRCUIT.
A RX TRIP OCCURRED DURING TURBINE GOVERNOR VALVE TESTING.
A FAILED TURBINE GOVERNOR VALVE CIRCUIT CARD CAUSED THE VALVE TO RAPIDLY CYCLE CLOSED AND OPEN TWICE. THE SUBSEQUENT POWER INCREASE RESULTED IN A VARIABLE OVER WATERFORD 3 02/13/01 382 4 3822001003 37742 OPERATE AUTO POWER RX TRIP.
THE REACTOR TRIPPED DURING DEH TESTING FOLLOWING MAINTENANCE ON THE DEH QUADVOTER VALVE SOLENOID. THE CAUSE OF THE SCRAM WAS A GOVERNOR VALVE FAST CLOSURE DUE TO A DEH TRIP HEADER PRESSURE FLUCTUATION DUE TO AIR COLUMBIA 02/08/09 397 4 3972009001 44839 OPERATE AUTO INTRODUCED DURING MAINTENANCE.
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e R THE REACTOR WAS MANUALLY TRIPPED DUE TO THE LOSS OF THE MAIN GENERATOR SEAL OIL SYSTEM. THE SEAL OIL FILTER BECAME CLOGGED DURING TESTING AND SEAL OIL PRESSURE COULD NOT BE COLUMBIA 05/08/09 397 4 3972009002 45051 OPERATE MAN RESTORED.
THE REACTOR WAS MANUALLY TRIPPED WHEN A FIRE WAS OBSERVED BETWEEN THE MAIN TURBINE BEARINGS. THE FIRE THAT WAS CAUSED BY LEAKING LUBE OIL WAS EXTINGUISHED IN 17 MINUTES. THE LUBE OIL LEAK WAS DUE TO AN OUT OF CAL PRESS COLUMBIA 06/26/09 397 4 3972009003 45169 OPERATE MAN SWITCH ON THE LO EXHAUSTER SYSTEM.
THE REACTOR TRIPPED FROM 100% POWER FOLLOWING A FIRE IN A NON-SAFETY-RELATED BUS THAT RESULTED IN A MAIN TURBINE TRIP.
THE PROBABLE CAUSE OF THE LOSS OF BUS WAS THE RELAXATION OF COLUMBIA 08/05/09 397 4 3972009004 45245 OPERATE AUTO A BOLTED CONNECTION DUE TO REPEATED THERMAL CYCLES.
THE REACTOR WAS MANUALLY TRIPPED DUE TO A LEAK IN THE DIGITAL ELECTRO-HYDRAULIC CONTROL SYSTEM. THE LEAK IN THE AREA OF THE QUAD-VOTER HYDRAULIC TRIP SUBSYSTEM WAS CAUSED BY AN O-RING FAILURE DUE TO INCORRECT ASSEMBLY COLUMBIA 11/07/09 397 4 3972009005 45484 OPERATE MAN FOLLOWING MAINTENANCE.
DURING TESTING OF A NEW DIGITAL ELECTRO-HYDRAULIC QUADVOTER VALVE, A LEAK DEVELOPED, WHICH DROPPED DEH RESERVOIR LEVEL 8 INCHES. THIS RESULTED IN BOTH A MAIN THE REACTOR SCRAMMED ON A TURBINE GOVERNOR COLUMBIA 08/21/08 397 4 3972008001 44432 OPERATE AUTO TURBINE TRIP AND REACTOR TRIP. VALVE FAST CLOSURE TRIP OIL PRESSURE LOW SIGNAL.
AT 70% POWER WITH ONE CONDENSATE PUMP SECURED, THE RUNNING CONDENSATE PUMP TRIPPED DUE TO INCORRECT CONFIGURATION OF THE PUMP LUBE OIL FILTER VALVES AND THE DECISION TO TRANSFER FILTERS WITH THE PUMP IN SERVICE. THE COLUMBIA 06/28/07 397 4 3972007004 43457 OPERATE AUTO REACTOR TRIPPED ON LOW WATER LEVEL.
THE REACTOR TRIPPED FOLLOWING A TURBINE TRIP CAUSED BY LOW AUTO STOP OIL PRESSURE. THE CAUSE OF THE FAILURE WAS A FAILED COLUMBIA 10/31/06 397 4 3972006001 42950 OPERATE AUTO DIGITAL ELECTRO-HYDRAULIC DIGITAL INPUT CARD.
A RX SCRAM OCCURRED ON TURBINE THROTTLE VALVE CLOSURE.
COLUMBIA 06/15/05 397 4 3972005003 41779 OPERATE AUTO THE MOST LIKELY CAUSE WAS FAILURE OF DEH CIRCUIT CARDS.
A SCRAM OCCURRED ON LOW RX WATER LEVEL AFTER A FEEDWATER PUMP WAS LOST. THE CAUSE WAS A FALSE LOW SUCTION PRESSURE SIGNAL RESULTING WHEN A TECHNICIAN TOUCHED THE WRONG COLUMBIA 06/23/05 397 4 3972005004 41790 OPERATE AUTO TERMINATION POINT WITH A MULTI METER DURING MAINTENANCE.
A RX SCRAM OCCURRED ON HIGH RCS PRESSURE FOLLOWING THE CLOSURE OF A TURBINE GOVERNOR VALVE. THE CAUSE WAS FAILURE OF A CIRCUIT BOARD IN THE TURBINE DIGITAL ELECTRONIC CONTROL COLUMBIA 07/30/04 397 4 3972004004 40910 OPERATE AUTO SYSTEM.
THE RX WAS MANUALLY SCRAMMED WHEN THE RUNNING RX FEEDWATER PUMP TRIPPED ON HIGH RX FEEDWATER TURBINE DRAIN TANK LEVEL. THE CAUSE WAS INADEQUATE INTERFACE REQUIREMENTS BETWEEN NORMAL AND SHUTDOWN OPERATING COLUMBIA 08/15/04 397 4 3972004005 40959 OPERATE MAN CONDITIONS.
THE RX WAS MANUALLY TRIPPED DURING A STARTUP WHEN THE OPERATING RX FEEDWATER PUMP TRIPPED ON LOW SUCTION PRESSURE. OPERATOR ERROR RESULTED IN UNCONTROLLED FEEDWATER HEATER FILLING THAT CAUSED THE FEEDWATER SYSTEM COLUMBIA 08/17/04 397 4 3972004006 40964 OPERATE MAN TRANSIENT.
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e R A TURBINE TRIP/RX SCRAM OCCURRED ON A MAIN TRANSFORMER DIFFERENTIAL CURRENT RELAY ACTUATION. THE CAUSE WAS FAILURE COLUMBIA 06/30/03 397 4 3972003007 39965 OPERATE AUTO OF A NONJACKETED CABLE THROUGH FRETTING ACTION.
A TURBINE TRIP/RX SCRAM OCCURRED FOLLOWING A MAIN GENERATOR AND TRANSFORMER OVERALL DIFFERENTIAL PROTECTIVE RELAY TRIP. THE CAUSE WAS A SHORT TO GROUND IN AN UNUSED TAP OF ONE OF THE 500KV CURRENT TRANSFORMER'S COLUMBIA 06/26/00 397 4 3972000003 37114 OPERATE AUTO SECONDARY CONTROL CIRCUIT WIRING.
THE RX WAS MANUALLY SCRAMMED ON DECREASING CONDENSER VACUUM. THE CAUSE WAS A BROKEN TURBINE DRAIN LINE WHICH COLUMBIA 09/18/00 397 4 3972000007 37345 OPERATE MAN ALLOWED AIR TO ENTER THE CONDENSER.
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Docket Plant Name, Unit Number NRC Reactor Unit Web Page Number Oyster Creek Nuclear Generating Station, Unit 1 Oyster Creek 5000219 Nine Mile Point Nuclear Station, Unit 1 Nine Mile Point 1 5000220 Dresden Nuclear Power Station, Unit 2 Dresden 2 5000237 Ginna Nuclear Power Plant Ginna 5000244 Indian Point Nuclear Generating, Unit 2 Indian Point 2 5000247 Dresden Nuclear Power Station, Unit 3 Dresden 3 5000249 Turkey Point Nuclear Generating, Unit 3 Turkey Point 3 5000250 Turkey Point Nuclear Generating, Unit 4 Turkey Point 4 5000251 Quad Cities Nuclear Power Station, Unit 1 Quad Cities 1 5000254 Palisades Nuclear Plant Palisades 5000255 Browns Ferry Nuclear Plant, Unit 1 Browns Ferry 1 5000259 Browns Ferry Nuclear Plant, Unit 2 Browns Ferry 2 5000260 Robinson Steam Electric Plant, Unit 2 Robinson 2 5000261 Monticello Nuclear Generating Plant, Unit 1 Monticello 5000263 Quad Cities Nuclear Power Station, Unit 2 Quad Cities 2 5000265 Point Beach Nuclear Plant, Unit 1 Point Beach 1 5000266 Oconee Nuclear Station, Unit 1 Oconee 1 5000269 Oconee Nuclear Station, Unit 2 Oconee 2 5000270 Vermont Yankee Nuclear Power Plant, Unit 1 Vermont Yankee 5000271 Salem Nuclear Generating Station, Unit 1 Salem 1 5000272 Diablo Canyon Nuclear Power Plant, Unit 1 Diablo Canyon 1 5000275 Peach Bottom Atomic Power Station, Unit 2 Peach Bottom 2 5000277 Peach Bottom Atomic Power Station, Unit 3 Peach Bottom 3 5000278 Surry Nuclear Power Station, Unit 1 Surry 1 5000280 Surry Nuclear Power Station, Unit 2 Surry 2 5000281 Prairie Island Nuclear Generating Plant, Unit 1 Prairie Island 1 5000282 Fort Calhoun Station, Unit 1 Fort Calhoun 5000285 Indian Point Nuclear Generating, Unit 3 Indian Point 3 5000286 Oconee Nuclear Station, Unit 3 Oconee 3 5000287 Three Mile Island Nuclear Station, Unit 1 Three Mile Island 1 5000289 Pilgrim Nuclear Power Station Pilgrim 1 5000293 Browns Ferry Nuclear Plant, Unit 3 Browns Ferry 3 5000296 Cooper Nuclear Station Cooper 5000298 Point Beach Nuclear Plant, Unit 2 Point Beach 2 5000301 Crystal River Nuclear Generating Plant, Unit 3 Crystal River 3 5000302 Kewaunee Power Station Kewaunee 5000305 Prairie Island Nuclear Generating Plant, Unit 2 Prairie Island 2 5000306 Salem Nuclear Generating Station, Unit 2 Salem 2 5000311 Arkansas Nuclear One, Unit 1 Arkansas Nuclear 1 5000313 Donald C. Cook Nuclear Power Plant, Unit 1 D.C. Cook 1 5000315 Donald C. Cook Nuclear Power Plant, Unit 2 D.C. Cook 2 5000316 Calvert Cliffs Nuclear Power Plant, Unit 1 Calvert Cliffs 1 5000317 Calvert Cliffs Nuclear Power Plant, Unit 2 Calvert Cliffs 2 5000318 Hatch Nuclear Plant, Unit 1 Hatch 1 5000321 Diablo Canyon Nuclear Power Plant, Unit 2 Diablo Canyon 2 5000323
Brunswick Steam Electric Plant, Unit 2 Brunswick 2 5000324 Brunswick Steam Electric Plant, Unit 1 Brunswick 1 5000325 Sequoyah Nuclear Plant, Unit 1 Sequoyah 1 5000327 Sequoyah Nuclear Plant, Unit 2 Sequoyah 2 5000328 Duane Arnold Energy Center Duane Arnold 5000331 FitzPatrick Nuclear Power Plant FitzPatrick 5000333 Beaver Valley Power Station, Unit 1 Beaver Valley 1 5000334 St. Lucie Plant, Unit 1 Saint Lucie 1 5000335 Millstone Power Station, Unit 2 Millstone 2 5000336 North Anna Power Station, Unit 1 North Anna 1 5000338 North Anna Power Station, Unit 2 North Anna 2 5000339 Fermi, Unit 2 Fermi 2 5000341 Davis-Besse Nuclear Power Station, Unit 1 Davis-Besse 5000346 Farley Nuclear Plant, Unit 1 Farley 1 5000348 Limerick Generating Station, Unit 1 Limerick 1 5000352 Limerick Generating Station, Unit 2 Limerick 2 5000353 Hope Creek Generating Station, Unit 1 Hope Creek 1 5000354 San Onofre Nuclear Generating Station, Unit 2 San Onofre 2 5000361 San Onofre Nuclear Generating Station, Unit 3 San Onofre 3 5000362 Farley Nuclear Plant, Unit 2 Farley 2 5000364 Hatch Nuclear Plant, Unit 2 Hatch 2 5000366 Arkansas Nuclear One, Unit 2 Arkansas Nuclear 2 5000368 McGuire Nuclear Station, Unit 1 McGuire 1 5000369 McGuire Nuclear Station, Unit 2 McGuire 2 5000370 LaSalle County Station, Unit 1 La Salle 1 5000373 LaSalle County Station, Unit 2 La Salle 2 5000374 Waterford Steam Electric Station, Unit 3 Waterford 3 5000382 Susquehanna Steam Electric Station, Unit 2 Susquehanna 1 5000387 Susquehanna Steam Electric Station, Unit 1 Susquehanna 2 5000388 St. Lucie Plant, Unit 2 Saint Lucie 2 5000389 Watts Bar Nuclear Plant, Unit 1 Watts Bar 1 5000390 Virgil C. Summer Nuclear Station, Unit 1 Summer 5000395 Columbia Generating Station, Unit 2 Columbia Generating Station 5000397 Harris Nuclear Power Plant, Unit 1 Shearon Harris 1 5000400 Nine Mile Point Nuclear Station, Unit 2 Nine Mile Point 2 5000410 Beaver Valley Power Station, Unit 2 Beaver Valley 2 5000412 Catawba Nuclear Station, Unit 1 Catawba 1 5000413 Catawba Nuclear Station, Unit 2 Catawba 2 5000414 Grand Gulf Nuclear Station, Unit 1 Grand Gulf 1 5000416 Millstone Power Station, Unit 3 Millstone 3 5000423 Vogtle Electric Generating Plant, Unit 1 Vogtle 1 5000424 Vogtle Electric Generating Plant, Unit 2 Vogtle 2 5000425 Perry Nuclear Power Plant, Unit 1 Perry 1 5000440 Seabrook Station, Unit 1 Seabrook 1 5000443 Comanche Peak Steam Electric Station, Unit 1 Comanche Peak 1 5000445 Comanche Peak Steam Electric Station, Unit 2 Comanche Peak 2 5000446 Byron Station, Unit 1 Byron 1 5000454
Byron Station, Unit 2 Byron 2 5000455 Braidwood Station, Unit 1 Braidwood 1 5000456 Braidwood Station, Unit 2 Braidwood 2 5000457 River Bend Station, Unit 1 River Bend 1 5000458 Clinton Power Station, Unit 1 Clinton 5000461 Wolf Creek Generating Station, Unit 1 Wolf Creek 1 5000482 Callaway Plant Callaway 5000483 South Texas Project, Unit 1 South Texas 1 5000498 South Texas Project, Unit 2 South Texas 2 5000499 Palo Verde Nuclear Generating Station, Unit 1 Palo Verde 1 5000528 Palo Verde Nuclear Generating Station, Unit 2 Palo Verde 2 5000529 Palo Verde Nuclear Generating Station, Unit 3 Palo Verde 3 5000530
NRC Location Region Licensee Forked River, NJ (9 MI S of Toms River, NJ) 1 Exelon Generation Co., LLC Scriba, NY (6 MI NE of Oswego, NY) 1 Nine Mile Point Nuclear Station, LLC Morris, IL (9 MI E of Morris, IL) 3 Exelon Generation Co., LLC Ontario, NY (20 MI NE of Rochester, NY) 1 R.E. Ginna Nuclear Power Plant, LLC Buchanan, NY (24 MI N of New York City, NY) 1 Entergy Nuclear Operations, Inc.
Morris, IL (9 MI E of Morris, IL) 3 Exelon Generation Co., LLC Homestead, FL (20 MI S of Miami, FL) 2 Florida Power & Light Co.
Homestead, FL (20 MI S of Miami, FL) 2 Florida Power & Light Co.
Cordova, IL (20 MI NE of Moline, IL) 3 Exelon Generation Co., LLC Covert, MI (5 MI S of South Haven, MI) 3 Entergy Nuclear Operations, Inc.
Athens, AL (32 MI W of Huntsville, AL) 2 Tenessee Valley Authority Athens, AL (32 MI W of Huntsville, AL) 2 Tenessee Valley Authority Hartsville, SC (26 MI from Florence, SC) 2 Carolina Power & Light Co.,
Monticello, MN (30 MI NW of Minneapolis, MN) 3 Northern States Power Company Cordova, IL (20 MI NE of Moline, IL) 3 Exelon Generation Co., LLC Two Rivers, WI (13 MI NNW of Manitowoc, WI) 3 FPL Energy Duane Arnold, LLC Seneca, SC (30 MI W of Greenville, SC) 2 Duke Energy Carolinas, LLC Seneca, SC (30 MI W of Greenville, SC) 2 Duke Energy Carolinas, LLC Vernon, VT (5 MI S of Brattleboro, VT) 1 Entergy Nuclear Operations, Inc.
Hancock Bridge, NJ (18 MI S of Wilmington, DE) 1 PSEG Nuclear, LLC Avila Beach, CA (12 MI WSW of San Luis Obispo, CA) 4 Pacific Gas & Electric Co.
Delta, PA (17.9 MI S of Lancaster, PA) 1 Exelon Generation Co., LLC Delta, PA (17.9 MI S of Lancaster, PA) 1 Exelon Generation Co., LLC Surry, VA (17 MI NW of Newport News, VA) 2 Virginia Electric & Power Co.
Surry, VA (17 MI NW of Newport News, VA) 2 Virginia Electric & Power Co.
Welch, MN (28 MI SE of Minneapolis, MN) 3 Northern States Power Co. Minnesota Fort Calhoun, NE (19 MI N of Omaha, NE) 4 Omaha Public Power District Buchanan, NY (24 MI N of New York City, NY) 1 Entergy Nuclear Operations, Inc.
Seneca, SC (30 MI W of Greenville, SC) 2 Duke Energy Carolinas, LLC Middletown, PA (10 MI SE of Harrisburg, PA) 1 Exelon Generation Co., LLC Plymouth, MA (4 MI SE of Plymouth, MA) 1 Entergy Nuclear Operations, Inc.
Wheeler Lake, AL (10 MI SW of Athens, AL) 2 Tenessee Valley Authority Brownville, NE (23 MI S of Nebraska City, NE) 4 Nebraska Public Power District Two Rivers, WI (13 MI NNW of Manitowoc, WI) 3 FPL Energy Duane Arnold, LLC Crystal River, FL (80 MI N of Tampa, FL) 2 Florida Power Corp.
Kewaunee, WI (27 MI E of Green Bay, WI) 3 Dominion Energy Kewaunee, Inc.
Welch, MN (28 MI SE of Minneapolis, MN) 3 Northern States Power Co. Minnesota Hancock Bridge, NJ (18 MI S of Wilmington, DE) 1 PSEG Nuclear, LLC Russellville, AR (6 MI WNW of Russellville, AR) 4 Entergy Nuclear Operations, Inc.
Stevensville, MI (11 MI S of Benton Harbor, MI) 3 Indiana Michigan Power Co.
Stevensville, MI (11 MI S of Benton Harbor, MI) 3 Indiana Michigan Power Co.
Lusby, MD (40 MI S of Annapolis, MD) 1 Calvert Cliffs Nuclear Power Plant Inc.
Lusby, MD (40 MI S of Annapolis, MD) 1 Calvert Cliffs Nuclear Power Plant Inc.
Baxley , GA (11 MI N of Vidalia, GA) 2 Southern Nuclear Operating Co.
Avila Beach, CA (12 MI WSW of San Luis Obispo, CA) 4 Pacific Gas & Electric Co.
Southport, NC (2 MI N of Southport, NC) 2 Carolina Power & Light Co.
Southport, NC (2 MI N of Southport, NC) 2 Carolina Power & Light Co.
Soddy-Daisy, TN (9.5 MI NE of Chattanooga, TN) 2 Tenessee Valley Authority Soddy-Daisy, TN (9.5 MI NE of Chattanooga, TN) 2 Tenessee Valley Authority Palo, IA (8 MI NW of Cedar Rapids, IA) 3 FPL Energy Duane Arnold, LLC Scriba, NY (6 MI NE of Oswego, NY) 1 Entergy Nuclear Operations, Inc.
Shippingport, PA(17 MI W of McCandless, PA) 1 First Energy Nuclear Operating Co.
Jensen Beach, FL (10 MI SE of Ft. Pierce, FL) 2 Florida Power & Light Co.
Waterford. CT (3.2 MI WSW of New London, CT) 1 Dominion Nuclear Conneticut, Inc.
Louisa, VA (40 MI NW of Richmond, VA) 2 Virginia Electric & Power Co.
Louisa, VA (40 MI NW of Richmond, VA) 2 Virginia Electric & Power Co.
Newport, MI (25 MI NE of Toledo, OH) 3 The Detroit Edison Co.
Oak Harbor, OH (21 MI ESE of Toledo, OH) 3 First Energy Nuclear Operating Co.
Columbia, AL (18 MI S of Dothan, AL) 2 Southern Nuclear Operating Co.
Limerick, PA (21 MI NW of Philadelphia, PA) 1 Exelon Generation Co., LLC Limerick, PA (21 MI NW of Philadelphia, PA) 1 Exelon Generation Co., LLC Hancock Bridge, NJ (18 MI SE of Wilmington, DE) 1 PSEG Nuclear, LLC San Clemente, CA (4 MI SE of San Clemente, CA) 4 Southern California Edison Co.
San Clemente, CA (4 MI SE of San Clemente, CA) 4 Southern California Edison Co.
Columbia, AL (18 MI S of Dothan, AL) 2 Southern Nuclear Operating Co.
Baxley , GA (11 MI N of Vidalia, GA) 2 Southern Nuclear Operating Co.
Russellville, AR (6 MI WNW of Russellville, AR) 4 Entergy Nuclear Operations, Inc.
Huntsville, NC (17 MI N of Charlotte, NC) 2 Duke Energy Carolinas, LLC Huntsville, NC (17 MI N of Charlotte, NC) 2 Duke Energy Carolinas, LLC Marseilles, IL (11 MI SE of Ottawa, IL) 3 Exelon Generation Co., LLC Marseilles, IL (11 MI SE of Ottawa, IL) 3 Exelon Generation Co., LLC Killona, LA (25 MI W of New Orleans, LA) 4 Entergy Nuclear Operations, Inc.
Berwick, PA (7 MI NE of Berwick, PA) 1 PPL Susquehanna, LLC Berwick, PA (7 MI NE of Berwick, PA) 1 PPL Susquehanna, LLC Jensen Beach, FL (10 MI SE of Ft. Pierce, FL) 2 Florida Power & Light Co.
Spring City, TN (60 MI S of Spring City, TN) 2 Tenessee Valley Authority Jenkinsville, SC (26 MI NW of Columbia, SC) 2 South Carolina Electric & Gas Co.
Richland, WA (12 MI NW of Richland, WA) 4 Energy Northwest New Hill, NC (20 MI SW of Raleigh, NC) 2 Carolina Power & Light Co.
Scriba, NY (6 MI NE of Oswego, NY) 1 Nine Mile Point Nuclear Station, LLC Shippingport, PA (17 MI W of McCandless, PA) 1 First Energy Nuclear Operating Co.
York, SC (18 MI S of Charlotte, NC) 2 Duke Energy Carolinas, LLC York, SC (18 MI S of Charlotte, NC) 2 Duke Energy Carolinas, LLC Port Gibson, MS (25 MI S of Vicksburg, MS) 4 Entergy Nuclear Operations, Inc.
Waterford. CT (3.2 MI WSW of New London, CT) 1 Dominion Nuclear Conneticut, Inc.
Waynesboro, GA (26 MI SE of Augusta, GA) 2 Southern Nuclear Operating Co.
Waynesboro, GA (26 MI SE of Augusta, GA) 2 Southern Nuclear Operating Co.
Perry, OH (35 MI NE of Cleveland, OH) 3 First Energy Nuclear Operating Co.
Seabrook, NH (13 MI S of Portsmouth, NH) 1 FPL Energy Seabrook, LLC Glen Rose, TX (4 MI N of Glen Rose, TX) 4 Luminant Generation Co., LLC Glen Rose, TX (4 MI N of Glen Rose, TX) 4 Luminant Generation Co., LLC Byron, Il (17 MI SW of Rockford, IL) 3 Exelon Generation Co., LLC
Byron, Il (17 MI SW of Rockford, IL) 3 Exelon Generation Co., LLC Braceville, IL (20 MI SSW of Joilet, IL) 3 Exelon Generation Co., LLC Braceville, IL (20 MI SSW of Joilet, IL) 3 Exelon Generation Co., LLC St. Francisville, LA (24 MI NNW of Baton Rouge, LA) 4 Entergy Nuclear Operations, Inc.
Clinton, IL (6 MI E of Clinton, IL) 3 Exelon Generation Co., LLC Burlington, KS (3.5 MI NE of Burlington, KS) 4 Wolf Creek Nuclear Operating Corp.
Fulton, MO (25 MI ENE of Jefferson City, MO) 4 Union Electric Co.
Bay City, TX (12 MI SSW of Bay City, TX) 4 STP Nuclear Operating Co.
Bay City, TX (12 MI SSW of Bay City, TX) 4 STP Nuclear Operating Co.
Wintersburg, AZ (50 MI W of Phoenix, AZ) 4 Arizona Public Service Company Wintersburg, AZ (50 MI W of Phoenix, AZ) 4 Arizona Public Service Company Wintersburg, AZ (50 MI W of Phoenix, AZ) 4 Arizona Public Service Company