Pages that link to "05000424/LER-2002-001, Re Improperly Wired Interlock Affects ECCS Recirculation Valve"
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The following pages link to 05000424/LER-2002-001, Re Improperly Wired Interlock Affects ECCS Recirculation Valve:
Displayed 8 items.
- 05000424/LER-2002-001 (redirect page) (← links)
- 05000424/LER-2009-002 (← links)
- 05000424/LER-2004-002 (← links)
- 05000424/LER-1991-004, Submits Addl Info Re Amended 2.206 Petition Filed by M Hobby & a Mosbaugh Re Failure to Comply W/Tech Spec 3.0.4 on Entry Into Mode 6 on 900301,described in LER 91-004-00 (← links)
- 05000424/LER-1998-007, Forwards LER 98-007-00,re Inadequate Surveillances Due to Improperly Performed Response Time Testing,On 981215,IAW 10CFR50.73 (← links)
- 05000424/LER-1998-009, Forwards LER 98-009-00 Re Event in Which Improper Testing Method Resulted in Inadequate Surveillances on 981229 (← links)
- 05000424/LER-2023-002, Manual Reactor Trip Due to Failure of a Heater Drain Pump and Standby Condensate Pump (← links)
- 05000424/LER-2023-001, Partial Loss of Offsite Power Results in Emergency Diesel Generator and Auxiliary Feedwater Actuation (← links)
- 05000424/LER-2022-001, Manual Reactor Trip Due to Loss of a Main Feed Pump (← links)
- 05000424/LER-2021-001, Train a Safety Injection Pump Inoperability Causes the Unit to Operate in a Condition Prohibited by Technical Specifications (← links)
- 05000424/LER-2020-002, Re Oil Leak Causes Ultimate Heat Sink to Be Inoperable Longer than Allowed by Technical Specifications (← links)
- 05000424/LER-1998-004, :on 980420,ECCS Accumulators Were Unable to Mitigate Consequences of an Accident.Caused by Incorrect Application of Scaling Data Into Calibration Procedures. Revised Calibration Procedures (← links)
- 05000424/LER-1989-015-01, :on 890702,discovered Failure to Adequately Perform Requirements of Tech Spec 4.2.1.1.b for Monitoring & Logging of Axial Flux Difference.Caused by Personnel Error.Frequency for Monitoring Increased (← links)
- 05000424/LER-1988-025, :on 880731,lightning Struck Containment Bldg, Resulting in Reactor Trip.Caused by Electrical Surge from Lightning Strike Shutting Down Computers.Circuit Board in Security Sys Backup Computer Replaced (← links)
- 05000424/LER-1989-011-01, :on 890425,valve Closure Prevented Flow of Containment Bldg Air from Passing Through Monitor,Preventing Monitor to Perform Function.Caused by Loose Tubing Coupling. Loose Tubing Coupling Has Been Tightened (← links)
- 05000424/LER-1987-082, :on 871017,insp of Breaker Installed in Main Reactor Trip Breaker Cubicle B Indicated That Weld on Breaker Pole Shaft Lacked Proper Fusion.Caused by Procedural Inadequacy.Procedure Revised Re Response Time (← links)
- 05000424/LER-1989-006, :on 890130,gaseous Waste Processing Sys Outlet Oxygen Analyzer Failed to Pass Tech Spec Surveillance Requirements.Caused by Personnel Error.Procedure Revised & Involved Personnel Counseled (← links)
- 05000424/LER-1989-008, :on 890223,discovered That Dc Breakers for motor-operated Valves (MOV) in Turbine Driven Auxiliary Feedwater Pump Sys Not Proper Size.Caused by Inadequate Review of Drawing Change.Mov Breaker Reviewed (← links)
- 05000424/LER-1989-016, :on 890708,manual Reactor Trip Occurred Due to Failure of Main Feedwater Isolation Valve.On 890803,loop 4 Main Feedwater Isolation Valve Spuriously Closed Resulting in Reactor Trip.Caused by Reduced Flow (← links)
- 05000424/LER-1989-015, :on 890702,monitoring & Logging of Axial Flux Difference for Each Operable ex-core Channel Performed at 1 H Instead of 30 Minute Intervals.Caused by Personnel Error. Personnel Counseled & Monitoring Increased (← links)
- 05000424/LER-1989-008-01, :on 890223,discovered That 125 Volt Dc Breakers for motor-operated Valves in Turbine Driven Auxiliary Feedwater Pump Sys Not Proper Size.Caused by Inadequate Review of Drawing Change by Engineer (← links)
- 05000424/LER-1989-017-01, :on 890728,radiation Monitor ARE-2532B High Alarm Setpoint Resulted in Fuel Handling Bldg Isolation. Cause Unknown.Alarm Setpoint Raised & Procedure 35611-C Revised Re Panel Operating Steps (← links)
- 05000424/LER-1989-014-01, :on 890602,discovered That Plant Had Not Complied W/Paragraph 5.c Re Performance of Quarterly Spectrographic & Ferrographic Analysis of Engine Oil.Caused by Failure to Incorporate License Commitments (← links)
- 05000424/LER-1989-013-01, :on 890530,dissolved Gases Came Out of Solution & Actuated High Radiation Signal & Fuel Handling Bldg Isolation Occurred.Caused by Inadequate Procedure. Appropriate Procedure Revised (← links)
- 05000424/LER-1988-046, :on 890713,review of Surveillance Requirements for Fuel Handling Bldg Monitors Determined That Analog Channel Operational Test Had Not Been Performed Since 881022.Caused by Personnel Error (← links)
- 05000424/LER-1989-010-01, :on 890314,operator Valved Out Radiation Monitor Leads to Unmonitored Liquid Waste.Caused by Omission of Flushing of Monitor Lines Prior to Restarting Release. Operator Counseled & Procedure Changed (← links)
- 05000424/LER-1987-081, :on 870505,discovered That Excessive Anchor Darling (AD) Valve Weight Could Have Prevented Fulfillment of Safety Sys Function.Caused by Failure of AD to Notify Bechtel of Change in Weights.Valves Reviewed (← links)
- 05000424/LER-1989-009-01, :on 890313,radiation Monitor Spiked High, Causing Containment Ventilation Isolation & Entry Into Tech Spec 3.3.2.Table 3.3-2.Caused by Detector Tube Failure.Tube Replaced & Monitor Operated in Bypass Mode (← links)
- 05000424/LER-1987-051, :on 870620,discovered That Two Auxiliary Feedwater Sys Flow Transmitters Failed to Operate Properly. on 870806,discovered That Plant Not Into Limiting Condition for Operation.Caused by Personnel Error (← links)
- 05000424/LER-1987-052, :on 870809,containment Ventilation Isolation Occurred During Monthly Source Check of Containment Vent Effluent Radiogas Monitor.Caused by Procedural Inadequacies. Memo Issued Re Importance of Procedures (← links)
- 05000424/LER-1987-049, :on 870722,Tech Spec Limiting Condition for Operation 3.0.3 Entered Because Temp Switch Failed on Train B ESF Chiller While Train a ESF Room Cooler Unit Out of Svc for Preventive Maint.Temp Switch Replaced (← links)
- 05000424/LER-1987-050, :on 870728,reactor Trip Occurred.Caused by Personnel Error. Baseline Secondary Performance Test Suspended Until Further Engineering Tests Performed, Personnel Disciplined & Shop Meetings Held (← links)
- 05000424/LER-1987-048, :on 870618,required Tech Spec Leakage Test Not Performed.Caused by Personnel Error.Work Control Process Evaluated to Ensure That Work Orders Which Effect Tech Spec Surveillance Requirements Adequately Reviewed (← links)
- 05000424/LER-1987-070, :on 871123 & 1203,surveillance of Quadrant Power Tilt Ratio within Max Allowable Time Extension Missed by 35 & 3 Minutes,Respectively.Caused by Control Room Supervisor Error.Personnel Counseled (← links)
- 05000424/LER-1987-068, :on 871117,control Room Ventilation Isolation Occurred.Caused by Faulty Monitor Sensing Tube & Faulty Computer Software Design.Tube Replaced & Software Will Be Changed (← links)
- 05000424/LER-1987-066, :on 871111,unplanned Actuation of Reactor Protection Sys Occurred.Caused by Personnel Error.Cabinets Will Be Labeled Better & Surveillance Procedure Revised to Include Specific Panel & Pushbutton Numbers (← links)
- 05000424/LER-1987-067, :on 871116,room Temp Reading of Auxiliary Bldg Room 110 Not Taken Per Tech Specs.Caused by Shift Supervisor Failure to Recognize Importance of Readings.Personnel Involved Counseled (← links)
- 05000424/LER-1987-065, :on 871109,containment Ventilation Isolation Occurred.Caused by Failure of Check Source Actuator to Fully Contract to Storage Position & Software Design Inadequacy. Personnel Counseled (← links)
- 05000424/LER-1987-064, :on 871105,auxiliary Feedwater Pump Actuated Following Condensate Pump Work Activity.Caused by Operator Placing Wrong Condensate Pump Valve Handswitch in pull-to-lock Position.Labels Will Be Modified (← links)
- 05000424/LER-1987-063, :on 871105,turbine Trip Occurred When Turbine Vibration Monitor Actuated.Caused by Actuation of Vibration Monitor Due to Cable Movement.Labeling Cables to Advise Plant Personnel of Cabling Potential to Trip (← links)
- 05000424/LER-1987-062, :on 871028,unit Went from Mode 4 to Mode 3 W/O Completing All Required Actions Due to Improper Valve Line of Auxiliary Feedwater.Caused by Inadequate Procedure.Mode 4 Revised to Mode 3 (← links)
- 05000424/LER-1987-061, :on 871028,failure to Perform Functional Tests for Safety Injection Pump a & Auxiliary Feedwater Pump Train a Discharge Check Valve Occurred.Caused by Failure to Properly Implement Procedure 10008-C (← links)
- 05000424/LER-1987-060, :on 871026,control Room Isolation Occurred. Caused by Inadequate Procedure.Lab Standing Order Issued to Provide Instructions for Resetting Setpoints W/O Activating High Level Alarm (← links)
- 05000424/LER-1987-046, :on 870707,Tech Spec Surveillance Time Limit for Determining Quantity of Radioactivity in Waste Gas Decay Tank 1 Exceeded.Caused by Chemistry Personnel Oversight.Memo Re Compliance W/Requirements Sent to Personnel (← links)
- 05000424/LER-1987-047, :on 870708,main Turbine Trip Initiated Automatic Reactor Trip.Caused by Spurious Actuation of Temp Switch Tsh 6807.Mercoid Snap Action Switch Installed to Replace Mercury Wet Type Switch (← links)
- 05000424/LER-1987-057, :on 870808,high Pressure Reactor Trip,Low Pressure Reactor Trip & LPSI Actuation Bistables Tripped Per Procedure 18001-1.Caused by Procedural Deficiency. Transmitter Replaced.Procedure Revised (← links)
- 05000424/LER-1987-055, :on 870318,RHR Discharge Valves (1-HV-8809A & 1-HV-8809B) Temporarily Closed Per Procedure Resulting in Loss of Availability of One RHR Pump.Caused by Personnel Error.Operations Evaluation Program Revised (← links)
- 05000424/LER-1987-059, :on 871013,channel Checks Discovered Not Performed within Allowable Time Interval for Three Valves. Caused by Inadequate Procedure.Surveillance Procedure Revised to Include Channel Check for Valves (← links)
- 05000424/LER-1987-045, :on 870702,centrifugal Charging Pumps Removed from Svc.Caused by Personnel Error.Personnel Responsible for Writing,Reviewing & Approving Clearance Associated W/Closure of Incorrect Valves Counseled (← links)
- 05000424/LER-1987-036, :on 870615,auxiliary Feedwater Actuation Circuitry Discovered Disabled for 11 H.Caused by Personnel Error.Improper Pulled Fuses Reinstalled,Proper Fuse to Pull Clearly Designated & Personnel Counseled (← links)
- 05000424/LER-1987-043, :on 870628,improper Performance of Containment Pressure Surveillance Discovered.Caused by Personnel Error. Temporary Change to Procedure 1400-1 Incorporated Into Applicable Data Sheets (← links)
- 05000424/LER-1989-016-01, :on 890708,reactor Manually Tripped Following Spurious Closure of Main Feedwater Isolation Valve.Exact Cause unknown.Multi-channel Recorder Temporarily Placed on Both Control Circuitry Trains for 1HV-5230 (← links)
- 05000424/LER-1987-042, :on 870626,discovered That Boron Concentration Exceeds Tech Spec Limiting Condition of Operation Time Limit.Caused by Chemistry Technician Inattention to Detail. Personnel Involved Counseled & Memo Issued (← links)
- 05000424/LER-1987-040, :on 870622,containment Ventilation Isolation Occurred.Caused by Personnel Error.Engineering & Maint Personnel Counseled Re Cause of Incident & Provided Guidance to Avoid Repetition (← links)
- 05000424/LER-1987-037, :on 870616,personnel Discovered That Tech Specs Violated Because Leaking Containment Isolation Valve May Have Been Inoperable & Action Statement Not Met.Caused by Procedural Inadequacy.Procedure to Be Revised (← links)
- 05000424/LER-1987-041, :on 870623,reactor Trip Occurred Due to Automatic Trip of Main Turbine.Caused by Excessive Field Current Signal Due to Improperly Calibr Field Excitation Transducer.Transducer Recalibr (← links)
- 05000424/LER-1989-007, :on 890216,plant Operator Noted Lack of Entry for Fuel Handling Bldg Room B008 & Missed Readings for Two Previous Shifts.Caused by Personnel Error.Personnel Counseled & Data Sheets Reviewed (← links)
- 05000424/LER-1988-041, :on 881213,containment Purge Supply Isolation Valve in Penetration 83 Not Fully Seated.Caused by Valve Not Fully Closing Even Though Limit Switch Indicated Valve Closed.Valve Manually Seated (← links)
- 05000424/LER-1989-005, :on 890210,main Feedwater Pump Turbine Tripped on High Vibration.Cause Cannot Be Positively Identified. Corrective Actions Include Temporarily Installing Vibration Instrumentation to Collect Vibration Data (← links)
- 05000424/LER-1987-056, :on 870916,cumulative Dose Calculations Program for Gaseous Effluent Releases to Atmosphere for Radioiodines Did Not Include I-133.Caused by Software Package Failure to Include I-133.Package Corrected (← links)
- 05000424/LER-1987-038, :on 870620 & 25,shutdown Rod Banks Partially Withdrawn & Reactor Manually Tripped After Receipt of RPI Urgent Alarm Annunciator.Caused by Detector/Encoder Card Failure.Card Replaced (← links)
- 05000424/LER-1987-039, :on 870620,trip of Both Main Feedwater Isolation Pumps & Subsequent motor-driven Auxiliary Feedwater Pump Start Signal Occurred.Caused by Failed Pressure Transmitter.Transmitter Replaced (← links)
- 05000424/LER-1987-035, :on 870614,steam Generator 4 lo-lo Water Level Led to Reactor Trip,Turbine Trip,Feedwater Isolation & Start Auxiliary Feedwater Pumps.Caused by Failure of Hydraulic Tubing Connection.Connection Replaced (← links)
- 05000424/LER-1989-003, :on 890119,ESF Train B Chiller Removed from Svc for Calibr,Resulting in Entering Limiting Condition for Operation 1-89-032.Caused by Personnel Calibr Wrong Train. Train B Restored to Operable Status (← links)
- 05000424/LER-1989-004, :on 890119,reactor Shutdown Initiated Due to RCPB Leakage from Rcs.Moisture Observed in Drain Valve for Pressurizer Safety Valve Loop Seal Line.Caused by Fatigue Failure Due to Vibration.Supports Added (← links)
- 05000424/LER-1987-080, :on 870920,failed to Locate Evidence Documenting Completion of Tech Spec Table 4.7-1 Surveillance.Caused by Personnel Error & Failure to Follow Procedure 30025-C (← links)
- 05000424/LER-1987-054, :on 870824,Channel a Containment Hydrogen Monitor Control Room Indication & Alarm Inoperable.Caused by Personnel Error Combined W/Procedural Noncompliance. Technicians Counseled (← links)
- 05000424/LER-1987-030, :on 870603,reactor Tripped on Main Turbine Trip Initiated by Generator Unit Secondary Differential Relay 487-U2 Which Actuated When Ground Fault Occurred on 230 Kv Transmission Line (← links)
- 05000424/LER-1987-032, :on 870606,automatic Reactor Trip on Source Range Neutron Flux Protective Signal Occurred.Caused by Operator Error.Addl Simulator Training for Trainee,Reactor Operator & Shift Supervisor (← links)
- 05000424/LER-1987-034, :on 870607,reactor Tripped on Steam Generator 4 lo-lo Water Level Following Check Valve Failure Due to Inadequate Hinge Pin Design.Redesigned Pins Installed.Logic for Valves Modified.Part 21 Related (← links)
- 05000424/LER-1987-033, :on 870607,reactor Tripped on Steam Generator lo-lo Level While Transferring Feedwater Flow.Caused by Shift Supervisor.Supervisor Counseled & Addl Operator Assigned (← links)
- 05000424/LER-1987-053, :on 870818,19 & 0902,surveillance Intervals for Measuring Stroke Times of 13 Valves Discovered in Excess of Tech Spec Limits.Caused by Personnel Error.Regulatory Compliance Specialists Involved Counseled (← links)
- 05000424/LER-1987-028, :Between 870209 & 0306,during Various Phases of Startup Testing Program,Several Control Room Isolations Occurred Due to Spurious Signals from Train a Toxic Gas Monitor.Monitor Sensor Replaced (← links)
- 05000424/LER-1997-005-02, :on 970804,test Procedure Inadequacy Results in AFW Actuation Occurred.Caused by Procedure Inadequacy. Procedure Will Be Revised (← links)
- 05000424/LER-1997-002-02, Forwards LER 97-002-02,per 10CFR50.73.Encl Is Second Rev to LER Originally Submitted on 970220 & First Revised on 970730.Revs Are Marked W/Rev Bars in Left Hand Border (← links)
- 05000424/LER-1999-003-02, :on 990922,CR Door Painting Resulted in Loss of Positive Pressure Boundary.Caused by Inadequate pre-job Briefing.Doors Were Closed Upon Discovery by CR Personnel. with (← links)
- 05000424/LER-1997-007-02, :on 970912,discovered Containment Penetration Electrical Overcurrent Protection Was Not Tested.Caused by Failure to Adequately Document All of Containment Electrical Penetration Circuits.Installed Fuses (← links)
- 05000424/LER-1998-001-01, Forwards LER 98-001-01 Re Concrete Degradation Found in DG Exhaust Barriers.Changes Made Under Rev Marked W/Rev Bars on Left,Outside of LER Border (← links)
- 05000424/LER-1987-029, :on 870524,reactor Tripped on Steam Generator 3 lo-lo Level While Operators Transferring Feedwater Flow from Auxiliary Feedwater Sys to Main Sys.Caused by Incorrect Closure of Valve Piping.Valve Restored (← links)
- 05000424/LER-1987-031, :on 870603,while in Mode 3,steam Generator 2 Exceeded hi-hi Water Level Setpoint Resulting in Trip of Both Main Feedwater (MFW) Pumps & MFW Isolation.Caused by Procedural Error.New Max Level Established (← links)
- 05000424/LER-1987-012, :on 870405,reactor Trip Occurred Due to Water Level in Steam Generator 4 Reaching lo-lo Level Trip Setpoint.Caused by Overfeeding of Steam Generator 2 While in Manual Control.Air Booster Adjustments Made (← links)
- 05000424/LER-1987-027, :on 870513,reactor Trip Occurred When Steam Generator 1 Reached lo-lo Water Level Setpoint.Caused by Inadvertent Closure of MSIV During Maint,Due to Inadequate Instructions.Written Guidelines Established (← links)
- 05000424/LER-1987-026, :on 870510,main Feedwater Isolation & Turbine Trip Occurred Resulting in Actuation of Both motor-driven Auxiliary Feedwater Pumps.Caused by Inadequate Procedure. Operating Procedure Revised (← links)
- 05000424/LER-1987-024, :on 870506,main Feedwater Pump Trip Signal & Subsequent Auxiliary Feedwater Actuation Occurred.Caused by Procedural inadequacy.Short-term Corrective Action Precautions Added to Procedure 13615-1 (← links)
- 05000424/LER-1987-023, :on 870428,RHR Sys Min Flow Requirement Potentially Not Met.Caused by Partial Closure of RHR Valves. Restrictive Cable Tag Relocated & Valve Positioner Recalibr for Valves 1-HV-0606 & 1-HV-0607,respectively (← links)
- 05000424/LER-1987-018, :on 870429 & 0504,reactor Tripped on over-power & over-temp delta-temp Bistables on Channel 2.Caused by Faulty Bistable Circuit Board.Board Replaced & Branch Testing to Be Performed (← links)
- 05000424/LER-1987-019, :on 870429,Train a Toxic Gas Monitor Actuated Resulting in Control Room Isolation.Cause for Actuation Indeterminate.Chlorine Gas Removed from Site.Toxic Gas Monitors Restored to Operation (← links)
- 05000424/LER-1987-020, :on 870430,during Feedwater Flow Transfer While in Mode 2,feedwater Isolation Occurred on hi-hi Level Trip in Steam Generator.Caused by Main Feedwater Regulating Valve Leak.Valve Recalibr (← links)
- 05000424/LER-1987-017, :on 870421,control Room Ventilation Actuation Occurred.Caused by Failure of I&C Technician to Block Test Signal While Performing Source Check.Technician & Foreman Counseled on Following Plant Procedure (← links)
- 05000424/LER-1987-016, :on 870415,fuel Handling Bldg Isolation Occurred.Caused by High Radiation Signal from Exhaust Radiation Monitor Due to Incorrect Instructions.Valve Lineup Restored to Normal & Procedure Completed (← links)
- 05000424/LER-1987-013, :on 870410,reactor Trip Occurred When Steam Generator Water Level Reached lo-lo Level Trip Setpoint. Caused by Malfunctioning of Main Feedwater Pump a Discharge Valves.Packing Gland Readjusted (← links)
- 05000424/LER-1987-014, :on 870411,reactor Trip Occurred When Steam Generator Reached lo-lo Water Level Trip Setpoint.Caused by Wrong Control Card Jumper Configuration on Main Feedwater Regulating Valves.Jumper Reconfigured (← links)
- 05000424/LER-1987-015, :on 870413,steam Header Pressure Transmitter Failed High Causing Main & Auxiliary Feedwater Isolations. Caused by Personnel Error W/Inadvertent Connection of Test Equipment.Personnel Counseled (← links)
- 05000424/LER-1987-003-02, :on 870210,restriction of Pipe Movement W/ Incorrect Penetration Sealant Matl Discovered.Caused by Const & Engineering Personnel Oversight.Matl Removed & Subj Penetrations Reevaluated & Reworked (← links)
- 05000424/LER-1987-002-01, :on 870122,potential Failure of MSIVs to Close Following Small Steam Line Break.Cause Under Investigation. MSIVs Modified to Include Addition of Relief Valve in Hydraulic Sys of Actuator.Part 21 Related (← links)
- 05000424/LER-1987-001-01, :on 870119,data Review Revealed That Plant Effluent Radiation Monitoring Sys Vent Flow Transmitter Had Been Indicating Zero Flow Since 870116.Caused by Vendor Installing Incorrect Circuit board.W/870218 (← links)
- 05000424/LER-1997-006-02, :on 970830,H Monitoring Sys Train Was Rendered Inoperable.Caused by Personnel Error.Reviewed Tests Conducted During Period of Time Involved (← links)
- 05000424/LER-1999-002-03, :on 990630,high-energy Line Break Instrument Channels Were Inadequately Calibrated.Caused by Inadequate Surveillance Testing Procedures.Procedure Revs to Add Relay Testing in Progress.With (← links)
- 05000424/LER-1987-011, :on 870326,main Feedwater or Steam Generator Feed Pump B Tripped on Low Suction Pressure Due to Decreasing Water Level in Condenser Hotwell.Caused by Failure of Level Transmitter LT-4415 (← links)
- 05000424/LER-1987-010, :on 870321 & 24,reactor Protection Sys Actuations Occurred.Caused by Initial Adjustments of Automatic Controllers for Steam Dump & Bypass Feedwater Regulating Valve Controllers.Controls Adjusted (← links)
- 05000424/LER-1987-009, :on 870320-26,unit Experienced Five Short Duration Events Re Steam Generator Water Levels Exceeding hi-hi Water Level Trip Setpoint.Caused by Inability to Automatically Control Water Levels (← links)
- 05000424/LER-1987-008, :on 870319,while Performing Low Power Physics Test 1-600-04,reactor Tripped on High Positive Flux Rate During Startup.Caused by Low Setpoint for Channel 1N44 Neutron Flux Rate Bistable.Bistable Recalibr (← links)
- 05000424/LER-1987-004, :on 870213,containment Isolation Actuations Occurred.Caused by Faulty Circuit Board in Data Processing Module of Containment Radiation Monitor Channel.Board Replaced (← links)
- 05000424/LER-1998-006-03, Forwards LER 98-006-03 Re Motor Control Ctr Breaker Buckets Not Being Seismically Qualified.Rev Is Submitted to Document Results of Seismic Testing That Demonstrated That No Condition Outside Design Basis of TS Requirements (← links)
- 05000424/LER-1988-016, :on 880603,smoke from Electric Duct Heater Actuated Smoke Detection Alarms & Caused Water Leakage Into Control Room from Ceiling.Caused by Inadequate Design of Control Room Ceiling.Permanent Seal Installed (← links)
- 05000424/LER-1988-028, :on 881016,unplanned Safety Injection Signal Generated Prior to Procedural Step.Cause Undetermined & May Have Been Caused by Inadequate Procedure.Procedures 54055-1 & 54065-1 Revised to Use Circuitry (← links)
- 05000424/LER-1987-007, :on 870301,control Room Annunciator Alerted Operators That Steam Generator hi-hi Water Level Setpoint Had Been Reached.Caused by Personnel Error.Operators Counseled on Monitoring Steam Generator Level (← links)
- 05000424/LER-1987-006, :on 870225,automatic Actuation of motor-driven Auxiliary Feedwater Sys Occurred.Caused by Inadvertent Trip of Main Feedwater Pumps & Cognitive Error.Work Stopped Until Adequate Maint Work Order Provided (← links)
- 05000424/LER-1987-079, :on 880928,discovered Missed Surveillance of 870526 Sampling of Waste Gas Decay Tank.Caused by Component Failure & Lack of Sample Flow to Sampling Hood.Program Initiated to Set Torque Values for Clutches (← links)
- 05000424/LER-1987-078, :on 870308,containment Personnel Airlock Not Tested for Operability within 72 H During Multiple Entries & on 870501 & 05,waste Gas Decay Tanks Not Sampled within 24 H After Tank Additions.Caused by Procedure Error (← links)
- 05000424/LER-1988-006-03, :on 880917,concrete Plug Removed from Underground Auxiliary Feedwater Pipe Trench to Investigate Suspected Steam Leak.On 880927,openings to Trench Observed. Caused by Inadequate Physical Security Plan (← links)
- 05000424/LER-1987-077, :on 880928,missed Tech Spec Surveillance Events on 870403,0521 & 0723 Recognized as Reportable.Caused by Personnel Error.Involved Individuals Counselled & Appropriate Procedures Revised (← links)
- 05000424/LER-1998-003, :on 980128,I&C Personnel Were Conducting 18 Month Calibrations on Neutron Flux Monitoring System Unit 2 Train B RSP Indicators.Caused by Circuit Board Failure. Unit 2 Testing Was Peformed (← links)
- 05000424/LER-1998-009-01, :on 981229,improper Testing Method Resulted in Inadequate Surveillances.Caused by Inadequate Tps.Revised Procedures 14825-1/2 to Instruct Operators to Utilize Position Indicators When Testing Valves (← links)
- 05000424/LER-1998-002, :on 980122,SSPS Surveillance Testing Was Noted Inadequate.Caused by Inadequate Original Testing Design. Procedures Were Changed & Testing of Circuits for Three Functions Was Completed (← links)
- 05000424/LER-1997-010-01, :on 971019,manual RT During CR Drop Time Testing Was Noted.Caused by Failed Detector/Encoder Card in Dpri B Data Cabinet.Crs Were Withdrawn,Selecting Data a Only W/No Valid Rod Deviations Indicated (← links)
- 05000424/LER-1998-007-03, :on 981215,inadequate Surveillances Were Found. Caused by Wiring Error & Improperly Performed Response Time Testing.Wiring Error Corrected & Procedures Changed to Allow Online Testing (← links)
- 05000424/LER-1997-011, :on 971019,discovered SI Valves That Isolate Pump Discharge to RCS Hot Legs,Were Opened.Caused by Procedure Discrepancy.Closed Subject Valves Using Sys Operating Procedure & Corrected Procedure (← links)
- 05000424/LER-1997-008-02, :on 971011,noted That Turbine Stop Valves Closure Setpoints Were Not Properly Set.Caused by Procedure Inadequacy.Readjusted Limit Switches Utilizing Methodology of Adjusting Trip Setpoint While Valve Closes (← links)
- 05000424/LER-1997-009-02, :on 971014,CVI Actuation Signal from 1RE-0002 Had Not Blocked as Planned.Caused by Cognitive Personnel Error.Individual Involved Was Counseled Re Importance of Performing His Assigned Duties (← links)
- 05000424/LER-1990-020-01, :on 900808,personnel Error Led to Tech Spec Violation (← links)
- 05000424/LER-1988-004-01, :on 880201,containment Hydrogen Monitor Control Room Indication & Alarm Inoperable Due to Reversal of Signal Wire Leads at Cabinet.Caused by Personnel Error.Technician Counseled & Procedure Revised (← links)
- 05000424/LER-1988-005, :on 880202,discovered That Required Grab Sample for Control Bldg Sump Effluent Discharge Not Performed. Caused by Personnel Error.Foreman Counseled to Reinforce Importance of Tech Spec Compliance (← links)
- 05000424/LER-1987-074, :on 871006,identified Maint Work Order Not Closed & Deficiency Card Written Specifying O-Ring Not Installed & Covers Not Properly Secured.Caused by Review Not Performed in Timely Manner (← links)
- 05000424/LER-1988-003-01, :on 880201,feedwater Isolation Actuation Occurred Due to hi-hi Level in Steam Generator 1.Caused by Operator Opening Main Feedwater Isolation Valve W/Condensate & Feedwater Sys in Long Cycle Lineup (← links)
- 05000424/LER-1988-031, :on 881030,core Alterations Suspended While Train a Loss of Offsite Power Test Conducted Blocking Actuation of Train a Esf.Test Procedure Will Be Corrected (← links)
- 05000424/LER-1988-030, :on 881027,discovered That Plant Computer Design Feature for Monitoring Deviations Between Digital Rod Indication Sys & Demand Position Indication Sys Not Implemented within Computer Software (← links)
- 05000424/LER-1998-006-02, :on 981008,auxiliary FW Train B Breaker Buckets Were Not Seismically Qualified.Caused by Personnel Error. Seismic Clips Were Secured & Event Will Be Addressed in Electricians Training.With (← links)
- 05000424/LER-1988-015, :on 880524,discovered Monthly Analog Channel Operational Test for Containment Radiation Level Monitors Not Performed Since Aug 1987.Caused by Personnel Error. Previous Tech Spec Revs Will Be Reviewed (← links)
- 05000424/LER-1988-027, :on 881004,containment Ventilation Isolation (CVI) Initiated.Caused by Inadequate Procedure.Procedures Will Be Changed by 881115 to Incorporate Steps to Prevent CVIs & Evaluation Underway (← links)
- 05000424/LER-1988-026, :on 880907,electrician Created Short Between Two 120-volt Ac Circuits.Alarms & Indicators Actuated, Including Containment Ventilation Isolation.Caused by Use of Improper Tool.Personnel Reinstructed (← links)
- 05000424/LER-1998-001-02, Forwards LER 98-001-02 Re Discovery of Concrete Degradation in DG Exhaust Stacks.Completion Date for Implementation of New Design Is Being Changed from 981015 to 1115 Due to Design & Installation Problems (← links)
- 05000424/LER-1988-013-01, :on 880424,manual Reactor Trip Initiated in Anticipation of Receiving Steam Generator Low Level Setpoint Automatic Reactor Trip.Caused by Loop 4 Main Feed Isolation Valve Failure.Involved Component Replaced (← links)
- 05000424/LER-1988-014, :on 880425,Tech Spec Surveillance Test Not Performed within Required Time Interval.Caused by Personnel Error & Inadequate Communications.Personnel Involved Counseled Re Use of Overdue Rept (← links)
- 05000424/LER-1988-021, :on 880712,discovered That Procedure for Performing Surveillance Re Tech Spec Resistance Values of 125 Volt Dc Battery Sys Inadequate.Caused by Inadequate Procedure.Procedure Revised (← links)
- 05000424/LER-1988-012, :on 880410,failed to Perform Surveillance Tasks within Required Time Interval.Caused by Inadequate Administrative Controls.Administrative Procedure Will Be Revised & Training Session Conducted (← links)
- 05000424/LER-1988-011, :on 880411,alert Alarm & Alarm Setpoints for Turbine Bldg Drain Effluent Monitor Set Too High Violating Tech Specs.Caused by Inadequate Administrative Controls of Alarm Setpoints.Controlling Procedure Revised (← links)
- 05000424/LER-1988-010, :on 880410,high Radiation Signal Received in Control Room Due to Relay Malfunction.Caused by Malfunction of Relay Associated W/Mode Keyswitch.Relay Replaced & Setpoints of Radiation Monitor Reviewed (← links)
- 05000424/LER-1988-008-01, :on 880407,stator Coolant Sys Alarm Received in Control Room.Caused by Mfg Error in Using Undersized Linkage Shaft on Stator Cooling Valve.Temp Controller Replaced (← links)
- 05000424/LER-1998-005-02, :on 980824,surveillance Was Not Performed When DG Was Rendered Inoperable.Caused by Failure to Control Amount of Debris at DG Exhaust.Expectations for Controlling Work on SR Sys Were re-emphasized.With (← links)
- 05000424/LER-1988-006, :on 880215,reactor Trip Initiated by Turbine Trip When Generator Field Ground Tripped Main Generator. Caused by Failure to Provide Adequate Work Instructions to Maint Electrician.Maint Foreman Counseled (← links)
- 05000424/LER-1988-024, :on 880730,reactor Trip Occurred.Caused by Generator Trip Signal Initiated by Protective Relays Due to Fault on Phase A.Failed & Damaged Parts Replaced & Infrared Scan Performed on Other Connection Points (← links)
- 05000424/LER-1988-007-01, :on 880322,85 Gallons Added to RCS Accumulator Tank 2 & Boron Sample Not Taken.Caused by Failure of Control Room Personnel to Follow Procedure.Personnel Counseled Re Importance of Complying W/Procedures (← links)
- 05000424/LER-1988-022-01, :on 880714,generator/turbine/reactor Trip Occurred as Result of Overexcitation Condition on Generator Field.Caused by Failure of Potential Transformer Which Led to Circuit Board Failures.Tranformer Replaced (← links)
- 05000424/LER-1997-002-01, Forwards LER 97-002-01 Re P-4 Turbine Trip & Other Circuits Not Surveillance Tested Per GL 96-01, Testing of SR Logic Circuits (← links)
- 05000424/LER-1987-069, :on 871120,plant Operated Above Max Power Level Specified in Ol.Caused by Nuclear Instrumentation Being Allowed to Indicate Below Calorimetric Value.Procedures Revised & Computer Point U1118 Validated (← links)
- 05000424/LER-1988-019-01, :on 880610,containment Ventilation Isolation Occurred.Caused by Apparent Power Supply Failure in Radiation Monitor & Inadequate Installation of Flow Transmitter Wire.Wire Insulated (← links)
- 05000424/LER-1988-018-01, :on 880606,unit Operated While Stated Leakage Detection Sys Inoperable,In Violation of Tech Specs.Caused by Inadequate Work Instructions to Maint Crew.Maint Will Receive Plant Effluent Monitoring Sys Training (← links)
- 05000424/LER-1988-016-01, :on 880603,water from Preaction Valve Leakoff Lines Seeped Into Control Room.Caused by Inadequate Design of Control Room Ceiling Penetrations.Seepage Path Blocked W/ Silicone Sealant & Sprinkler Sys Isolated (← links)
- 05000424/LER-1988-017-01, :on 880605,liquid Release Performed Prior to Completion of Source Check of Radiation Monitor.Caused by Inadequate Procedure.Procedure Revised to Require Source Check to Be Performed.Personnel Counseled (← links)
- 05000424/LER-1988-001-01, :on 880117,reactor Tripped from 100% of Rated Thermal Power.Caused by Low Flow Actuation signal.1NAB06-221 Sys Protection Relay (KD-10 Relay) Replaced.New Relay Calibr on 880122 (← links)
- 05000424/LER-1987-071, :on 871109,storage Tanks Refilled W/ Inadequately Analyzed Diesel Fuel Oil.Caused by Personnel Miscommunication.Analysis Procedure Revised & Personnel Involved Counseled (← links)
- 05000424/LER-1987-076, :on 871127,instrument Panel 1-1513-P5-HMA Inoperable for More than 7 Days.Caused by Personnel Error. Personnel Counseled on Control & Temporary Storage of Matls During in-process Work (← links)
- 05000424/LER-1987-075, :on 871222,screws from Hold Down Plate on Printed Circuit Card Rack,Identified Missing.Possibly Caused by Failure to Initially Install Screws.Missing Screws Installed (← links)
- 05000424/LER-1987-073, :on 871221,control Room Ventilation Isolation Actuation Initiated Due to High Level Alarm.Caused by Faulty Sensing Tube for Radiation Monitor & Computer Software Design.Tube Replaced & Software Changed (← links)
- 05000424/LER-1987-072, :on 871121,Tech Spec Surveillance Re Readings from Plant Safety Monitoring Sys Data Displays Inadequately Performed.Caused by Inadequate Training of Auxiliary Plant Operator.Training Will Be Enhanced (← links)
- 05000424/LER-1997-004, :on 970322,declared Atmospheric Relief Valves (Arvs) Inoperable Due to Unqualified Cabling.Cause Unknown.Repaired ARV Splices & All Remaining ARVs in Both Units 1 & 2 Were Inspected (← links)
- 05000424/LER-1997-003, :on 970213,unlatched Doors on MCC Changed Seismic Qualifications.Caused by Failure to Maintain MCC Doors Secured.Mcc Doors Were Secured as Necessary (← links)
- 05000424/LER-1996-010-01, :on 961101,safety Injection Pump Rendered Inoperable Due to Lack of Motor Cooling.Caused by Improper Gasket Installation & Inadequate Procedural Guidance.Coolers Reassembled Properly & SIP B Returned to Svc (← links)
- 05000424/LER-1996-011-01, :on 961023,inadequate Containment Electrical Penetration Protection & Missed Surveillance Occurred.Caused by Failure to Adequately Document Air Lock Lighting Circuits.Series Fuses Installed (← links)
- 05000424/LER-2020-001, Safety-Related Electrical Bus Deenergizing Results in Emergency Diesel Generator Starting (← links)
- 05000424/LER-1997-001, :on 970109,thermal Overload Bypass Jumper Connection Rendered ECCS Valve Inoperable.Caused by Cognitive Personnel Error.Electricians Involved Counseled (← links)
- 05000424/LER-1990-008, S-00:on 901011,eleven Documents Found Unattended & Unsecured in Folder on Desk Being Moved.Caused by Cognitive Personnel Error.Safeguards Documents Returned to Their Approved Storage Container (← links)
- 05000424/LER-1990-007, S-00:on 900829,safeguards Info Container Observed Unsecured & Unattended in Document File Room.Caused by Safeguards Info Coordinator Failure to Secure Container Before Going to Lunch.Coordinator Counseled & Reprimanded (← links)
- 05000424/LER-1996-010, :on 961101,safety Injection Pump Rendered Inoperable Due to Lack of Motor Cooling.Motor Coolers Were Reassembled Properly & SIP B Returned to Svc (← links)
- 05000424/LER-1996-012-01, :on 961127,main Generator Stator Cooling Short Circuit Leads to Turbine/Reactor Trip.Caused by Metal Tag Coming in Contact W/Terminal Strip.Fuse Replaced & Metal Tags Removed (← links)
- 05000424/LER-1992-007-03, :on 920809,AFW Pump Tripped on Mechanical Overspeed During Testing.Caused by Bent Tappet Stem.Tappet Assembly Replaced (← links)
- 05000424/LER-1950-424, Forwards LER 50-424/1990-08S Re Unsecured Safeguards Info Due to Personnel Error (← links)
- 05000424/LER-1992-010-03, :on 921118,TS Surveillance Not Performed When DG Fails.Caused by Vendor Fabrication Error.Right Bank Air Distributor Replaced (← links)
- 05000424/LER-1992-009-03, :on 921109,close Torque Switch Settings Increased from 1.0 to 2.25 & RCP Thermal Barrier Isolation Valves Declared Inoperable.Caused by Inaccuracies in Vendor Data.Setting Increased & Testing Performed (← links)
- 05000424/LER-1992-008-03, :on 920914,steam Flow/Feed Flow Mismatch Alarm Received & Maint Feedwater Pump a Speed & Discharge Pressure Rapidly Reduced.Caused by Failure of Speed Controller/ Tracker Card.Failed Circuit Card Replaced (← links)
- 05000424/LER-1996-001, :on 960220,nuclear Svc Cooling Water Sys Determined Inoperable Due to Pipe Fatigue.All Discharge Line Weld Indications &/Or Cracks Have Been Repaired & Design Changes Have Been Implemented (← links)
- 05000424/LER-1996-009-01, :on 960808,leaking Valve Results in Fuel Handling Bldg Isolation.Down Stream Needle & Relief Valves Were Replaced (← links)
- 05000424/LER-1996-006, :on 960525,RX Trip Occurred Due to Blown Fuse in Main Feedwater Isolation Valve.Fuse Was Replaced & Unit Was Restarted & Returned to Power (← links)
- 05000424/LER-1996-003-01, :on 960425,determined That Accumulator Crosstie Could Have Prevented Fulfillment of Safety Function of Sys Needed to Mitigate Consequences of Accident.Caused by Inadequate Procedures.Procedures Changed (← links)
- 05000424/LER-1996-005, :on 960515,unqualified Cabling Was Used in Containment Sump Level Transmitters.Caused by Improper Installation of Cabling by Removing Outside Jacketing in Unit 1.Replaced Cabling for Both Transmitters (← links)
- 05000424/LER-1996-008-01, :on 960614,discovered Missed Surveillances for Secondary Sys Specific Activity.Caused by Procedural Inadequacy.Revised Applicable Procedures (← links)
- 05000424/LER-1996-007-01, :on 960612,main Steamlines Isolated When Steam Dump Valve Failed Open.Caused by Failure of Steam Dump Valve to Full Open Position.Valve Repaired & Returned to Service (← links)
- 05000424/LER-1996-006-01, :on 960525,reactor Trip Occurred Due to Blown Fuse in Isolation Valve.Fuse Replaced & Unit Restarted & Returned to Power.Analysis of Failed Fuse Expected to Be Completed by 960628 (← links)
- 05000424/LER-1996-005-01, :on 960515,discovered Unqualified Cabling Used in Containment Sump Level Transmitters.Caused by Improper Installation.Replaced Cabling W/Qualified Matls (← links)
- 05000424/LER-1996-004-01, :on 960420,surveillance Test Not Performed for Neutron Flux Channel.Caused by Personnel Error.Operations Personnel Counseled,Event Reviewed in Training & Procedures Will Be Modified (← links)
- 05000424/LER-1992-006-03, :on 920624,personnel Observed That turbine-driven Auxiliary Feedwater Pump Opened & AFW Flowing to All Four Sg.Caused by Error in Vendor Manual.Manual Corrected Re Actuation of Relays (← links)
- 05000424/LER-1996-002-01, :on 960313,discovered That ECCS Valves Cycled on Five Occasions from 960222-29 Leading to Unit Operation in Condition Prohibited by Ts.Caused by Cognitive Personnel Error.Involved Personnel Counseled (← links)
- 05000424/LER-1992-005-03, :on 920604,containment Isolation Occurred Due to Inadvertent Grounding of Radiation Monitor Power Panel. Caused by Personnel Error.Personnel Will Receive Review of Event & Training Re Proper Use of Jumpers (← links)
- 05000424/LER-1992-004, :on 920514,reactor Shut Down Due to Excessive Unidentified Leakage.Caused by Fatigue Failure.Metallurgical Analysis Underway to Confirm Failure Mechanism (← links)
- 05000424/LER-1996-001-02, :on 960220,pipe Fatigue Leads to Nuclear Svc Cooling Water Inoperability.Caused by Design That Allows Fatigue Cracks to Develop in Discharge Piping.Indications/ Cracks Repaired (← links)
- 05000424/LER-1992-004-03, :on 920514,reactor Shutdown Due to Excessive Unidentified Leakage.Valve Assembly Removed & Weldolet Plugged (← links)
- 05000424/LER-1992-003-03, :on 920502,high Level Radiation Alarm Annunciated for Fuel Handling Bldg Radiation Monitors & Fuel Handling Bldg Isolation Occurred.Cause Not Determined. Performance Monitoring Will Continue (← links)
- 05000424/LER-1992-002-03, :on 920424,potential for Delays in Cycling ESFAS Sequencer Discovered & Sequencers Operated Outside Design Basis.Circuitry Defeated & Vendor Plan of Action Being Developed (← links)
- 05000424/LER-1991-015, :on 910829,leakage Limits Were Exceeded During LLRT of Containment Isolation Valve (Civ).Caused by Manufacturers Casting Mark on Valve Hinge Preventing Closure.Casting Mark on Valve Removed (← links)
- 05000424/LER-1992-001-02, :on 920415,stroke Time Testing Not Performed on Containment Isolation Valve to Demonstrate Operability,Per TS 4.6.3.1.Caused by Cognitive Personnel Error.Personnel Responsible for Error Counseled (← links)
- 05000424/LER-1995-007-01, :on 951213,unit Operated in Condition Prohibited by TS Due to Inadequate post-maintenance Functional Test.Caused by Cognitive Personnel Errors. Personnel Involved Counseled (← links)
- 05000424/LER-1995-006-01, :on 951101,maximum Reactor Power Exceeded Over 8 Hour Period Due to Oversight in Original Validation of Computer Calorimetric Software in Identifying Limitations of Software Program.Changed Procedures (← links)
- 05000424/LER-1995-005-02, :on 951002,ESF Chillers Inoperability Lead to Unit Operation Per TS 3.0.3.Reset Essential Chiller Instantaneous Overcurrent Relay Trip Setpoints in Both Units (← links)
- 05000424/LER-1995-004-02, :on 950924,MFW Pump a Speed Controller Malfunctioned,Causing Pump to Slowdown & Speedup Erratically.Caused by Failure of Tracker Driver Circuit Card.Failed Circuit Card Replaced (← links)
- 05000424/LER-1991-016-02, ,on 911223,cell of a Train Battery Failed to Meet TS Float Voltage Limit Due to Battery Aging.Replacement Cell to Be Installed & Precaution Added to single-cell Charging Procedure Triggering Notification (← links)
- 05000424/LER-1995-002-03, :on 950723,dual Unit RT Occurred Due to Lightning Strikes.Evaluation of Rod Control Sys Susceptibility to Voltage Surges & Proposed Corrective Actions Expected by 951001 (← links)
- 05000424/LER-1995-003-02, :on 950724,automatic Containment Ventilation Isolation Actuation Function Inactivated Due to Cognitive Personnel Error on Part of Gpc Unit Shift Supervisor (Uss) & Shift Superintendent (Ss).Uss & SS Counseled (← links)
- 05000424/LER-1991-015-02, :on 910829,valve Mfg Defect Leads to Containment Isolation Valve Failing to Open.Caused by Mfg Casting Mark.Casting Mark Removed & Returned to Svc.W/ (← links)
- 05000424/LER-1991-013-02, :on 911125,analyzer Pump Began to Unexpectedly Cycle on & Off,Resulting in Opening of Hydrogen Monitor Isolation Valves.Caused by Personnel Error.Shift Superintendent Counseled & Procedure Revised (← links)
- 05000424/LER-1991-014-02, :on 911126,fuel Handling Bldg Isolation Occurred Due to Generation of Radiation Monitor Signal. Caused by Loss of Power to Monitors.Radiation Monitors Returned to Svc Following Troubleshooting (← links)
- 05000424/LER-1991-012-02, :on 911118,discovered That Digital Rod Position Indication for Shutdown Bank A,Rod D-2 Stopped Moving, Resulting in Manual Actuation of Rps.Cause Undetermined. Addl Troubleshooting Will Be Performed (← links)
- 05000424/LER-1991-011-02, :on 911118,automatic Auxiliary Feedwater Sys Actuation Occurred When Steam Generator 1 Reached lo-lo Level Setpoint.Caused by Personnel Error.Operator Counseled Re Need to Maintain Control (← links)
- 05000424/LER-1991-010-03, :on 911106,train B Centrifugal Charging Pump Taken Out of Svc,Removing Only Remaining & Operable Boron Injection Flowpath.Caused by Personnel Error.Boron Injection Flowpath Procedures Will Be Revised by 920115 (← links)
- 05000424/LER-1991-009-03, :on 911026,loss of Residual Heat Removal Pump Flow Occurred During Draindown of Reactor Cavity.Caused by False High RCS Level Indications.Procedures to Ensure Verification of Vent Paths revised.W/911122 1tr (← links)
- 05000424/LER-1991-008-03, :on 911023,transformer Found to Be Smoking Heavily Resulting in ESF Actuation.On 911024,redundant Plant Vent Radiation Monitor Removed from Svc.Caused by Procedure Inadequacy.Procedure Revised (← links)
- 05000424/LER-1991-007-03, :on 910925,fuel Handling Bldg Isolation Occurred During Checks of Radiation Monitor.Cause Not Determined.Esf Signal Will Be Blocked When Work Performed at safety-related Display Console (← links)
- 05000424/LER-1995-001-03, :on 950511,lack of Penetration Seals Represented Condition Outside of Design Basis.Installed Penetration Seals (← links)
- 05000424/LER-1991-006-03, :on 910719,control Room Isolation Occurred Due to Circuit Board Failure for Outside Air Intake Radiogas Monitor.Caused by Personnel Error.Defective Util Circuit Board Replaced.Personnel Counseled (← links)
- 05000424/LER-1994-008-02, :on 941027,piping Penetration Area Filtration & Exhaust Sys Rendered Inoperable.Caused by Personnel Error. Two Circuits Cards Involved Were Reinstalled & Both Trains Restored (← links)
- 05000424/LER-1991-005-03, :on 910703,discovered Static Head Correction of Approx 25-psi Not Applied During Calbr of Pressurizer Pressure Transmitters for Both Units.Caused by Inadequate Procedures.Channels Recalibrated (← links)
- 05000424/LER-1990-021, :on 901202,special Condition Surveillance Not Performed When Rod Position Deviation Monitor Inoperable. Caused Personnel Error.Personnel Under Went Positive Discipline Re Compliance W/Procedures (← links)
- 05000424/LER-1993-011, :on 930924,failure to Perform Leak Rate Testing Following Maint Occurred.Caused by Inadequate Safety Evaluation for FSAR Change.Fsar Revised (← links)
- 05000424/LER-1994-007-02, :on 941004,TS 4.9.9 Special Condition Surveillance Requirement,Applicable During Core Alterations Had Not Been Performed.Caused by Personnel Error.Uss Has Been Counseled (← links)
- 05000424/LER-1994-006-02, :on 940911,upon Energization at 0036 Edt, NI-0032 Sent a High Flux Signal That Initiated an Automatic Reactor Trip.Caused by Loose Capacitor in NI-0032.Replaced pre-amplifier & NI-0032 Returned to Service (← links)
- 05000424/LER-1994-005-03, :on 940810,follow-up Investigation Found That Failed Relay Inside of Radiation Monitor Had Caused CVI Signal.Caused by Failure of 1RE-2565 Output Relay.Failed Relay Was Replaced (← links)
- 05000424/LER-1991-003-03, :on 910222,during Relay Testing RHR Sys Containment Sump Suction Valve Opened.Caused by Electrical Ground on stem-mounted Limit Switch.Ground Condition Will Be Examined,Confirmed & Corrected (← links)
- 05000424/LER-1991-004-03, :on 910306,breaker 1BD1-01 Opened,Resulting in Disconnecting Battery 1BD1B from 125-volt Power Supply & Causing ESF Actuations.Caused by Voltage Fluctuations in Battery Charger.Circuit Boards Replaced (← links)
- 05000424/LER-1994-004-02, :on 940619,discovered That Filtration Heaters for Three of Four Trains of CREFS Were Deenergized.Caused by Power Disturbance to Plant Electrical Systems.Heaters Were Reset & Restored to Full Capability (← links)
- 05000424/LER-1991-001-03, :on 910201,last Analog Channel Operational Tests for Four Triaxial time-history Accelerograph Seismic Monitoring Instruments in Error.Caused by Inadequate Surveillance Procedure.Procedure Revised (← links)
- 05000424/LER-1987-084, :on 901207,discovered That on 870419,reactor Coolant Drain Tank Leakage Slightly Greater than Tech Spec Limit.Caused by Use of Incorrect Vol Curve.Curve Corrected & Reissued & Leakage Calculation Recalculated (← links)
- 05000424/LER-1994-003, :on 940426,closed Dampers Rendered Two Trains of HVAC Inoperable.Caused by Drawing Discrepancies & Personnel Error.Power Restored to Exhaust Dampers & Personnel Counseled (← links)
- 05000424/LER-1994-003-03, :on 940426,PPAFES Were Found to Be Closed Due to Circuit Breakers Being Deenergized While Design Change Was Being Performed.Corrective Action:Engineers Will Be Trained & Circuit Breakers Have Been Corrected (← links)
- 05000424/LER-1990-024-01, :on 900807,Unit 2 Containment Isolation Valves Associated W/Train a Closed & Unit 1 Valves Opened for Testing.Caused by Procedural Inadequacy.Procedures Revised & Procedure Coordinator Informed (← links)
- 05000424/LER-1990-023-01, :on 901218,4160/480 Volt non-1E Transformer Experienced Internal Fault.Cause Indeterminate.Failed Transformer Replaced & Further Study of Possible Factors Which May Have Led to Failure in Progress (← links)
- 05000424/LER-1990-022-01, :on 901212,auditor Found Possible Discrepancy in Calculation for Determining Filter Unit Electrical Heater Power Dissipation.Caused by Architect/Engineer.Request for Tech Spec Change Submitted (← links)
- 05000424/LER-1990-021-01, :Between 901202-03,special Condition Surveillance Not Performed When Rod Position Deviation Monitor Inoperable.Caused by Personnel Error.Future Training on Proteus Computer Planned (← links)
- 05000424/LER-1989-020, :on 891211,power Removed from Radiation Monitor 1RE-0003 Prior to Lifting Leads to ESF Actuation Circuits, Causing Containment Ventilation Isolation.Caused by Personnel Error.Technician Disciplined (← links)
- 05000424/LER-1994-002-02, :on 940311,OPDT & OTDT Reactor Trips Initiated When Two delta-T Channels Exceeded Trip Setpoints. Caused by Inadequate Surveillance Procedures.Procedures Enhanced & Channels Monitored (← links)
- 05000424/LER-1994-001-02, :on 940202,transmitter Swung on Mounting Bolts & Impacted Handle of Isolation Valve for Sensing Line Causing Valve to Open.Caused by Personnel Error.Review Performed to Evaluate Use of test-in-bypass (← links)
- 05000424/LER-1990-003, S-01:on 900425,engineering Supervisor Observed Unsecured & Unattended Safeguards Cabinet in Engineering Support Dept Ofc Area.Caused by Cognitive Personnel Error. Engineer Counseled (← links)
- 05000424/LER-1990-018-01, :on 900907,discovered That Surveillance Required by Tech Spec 4.0.5 & ASME Section XI Inadequately Performed.Caused by Procedure Inadequacy.Procedure Corrected & Operability of Check Valve Reverified (← links)
- 05000424/LER-1990-017, :on 900305,sys Engineer Found That Certain Electrical Circuits Not Identified for Testing During Performance of Procedure.Caused by Inadequate ESFAS Test Procedure.Procedure 00404-C Revised (← links)
- 05000424/LER-1990-019-01, :900314,engineer Discovered Condition Which Would Allow Inservice Insps of Containment Isolation Valves to Be Performed Following Completion of ASME Section XI Local Leak Rate Testing (← links)
- 05000424/LER-1987-083, :on 900813,discovered That Instrument 2TIS-10980 Used for Verifying Refueling Water Storage Tank Temp Not Indicating.Caused by Procedural Inadequacy. Procedures Revised (← links)
- 05000424/LER-1993-012-01, :on 931013,discovered Surveillance Test Had Been Performed on Train a Recombiner Instead of Train B Due to Personnel Error.Disciplined Involved Supervisor (← links)
- 05000424/LER-1990-016, :on 900723,determined That Failed 4,160/480- Volt non-1E Transformer Led to Main Feed Pump Trip & Reactor Trip.Caused by Internal Fault in 1NB01 Transformer.Failed Transformer Replaced (← links)
- 05000424/LER-1993-011-01, :on 930924,failure to Perform Leak Rate Testing Due to Inadequate Safety Evaluation for FSAR Change.Local Leak Rate Testing on Valve 1HV-1979 Will Be Performed Following Entry Into Mode 5 (← links)
- 05000424/LER-1990-015, :on 900712,calibr Requirements Not Applied to Computer Points Used for Obtaining Final Feedwater Temp Input Valves.Caused by Cognitive Personnel Error.Precision Heat Balance Procedure to Be Revised (← links)
- 05000424/LER-1993-009-01, :on 930728,reactor Tripped During Maint Due to Low Pressure Signal.Caused by Cognitive Personnel Error. Personnel Involved Disciplined & Reminded of Importance of Procedural Compliance (← links)
- 05000424/LER-1993-004, :on 930410,ESFAS Sequencer Operation Initiated During Testing.Caused by Design Flaw in Circuit Card. Affected Cards in Both Train a & Train B Sequencers Modified (← links)
- 05000424/LER-1990-012, :on 900529,discovered That Sequencer Delay Times Not Taken Into Account During Summation Procedure for Control Room Emergency Filtration Sys.Caused by Inadequate Procedure Review.Procedures Changed (← links)
- 05000424/LER-1990-013, :on 900601,discovered That Containment Air Lock Leakage Surveillance Exceeded 6-month Test Interval,Per Tech Spec 4.6.1.3.b.Caused by Personnel Error.Plant Surveillance Tracking Program Revised (← links)
- 05000424/LER-1990-011, :on 900425,reactor Manually Tripped Due to Inadvertent Closure of Main Feed Regulating Valve.Caused by Mispositioning of Local Control Levers.Local Control Levers Removed (← links)
- 05000424/LER-1993-006, :on 930418,safety Injection Initiated During Slave Relay Testing.Caused by Personnel Error.Team Reminded to Request Assistance When Operational Questions Arise.W/ (← links)
- 05000424/LER-1993-007, :on 930425,manual Reactor Trip During Low Power Physics Testing Due to Negative Reactivity.Caused by Personnel Error.Reactor Engineer Counseled Re Importance of Attention to Detail (← links)
- 05000424/LER-1990-009, :on 900413,inadvertent Feedwater Isolation Occurred.Caused by Procedural Inadequacy.Procedure Revised to Have Input Error Inhibit Switch Placed in Normal First & Reinstate Block on Feedwater Isolation Signal (← links)
- 05000424/LER-1990-010, :on 900418,oncoming Shift Supervisor Found That Containment Level C Temp Improperly Recorded.Caused by Data Being Recorded & Reviewed from Malfunctioning Indication.Individuals Counseled (← links)
- 05000424/LER-1990-005, :on 900314,observed That Indicator Lights for Actuation Handswitches for Trains a & B of Fuel Handling Bldg Showed Actuation Occurred.Caused by Personnel Error. Operator Counseled (← links)
- 05000424/LER-1989-019-01, :on 891206,discovered That Tech Specs Violated Due to Foreman Approving Measurements of Cell Recorded as 2.10 V on 891122.Caused by Personnel Error & Inadequate Procedure.Foreman Counseled (← links)
- 05000424/LER-1993-008, :on 930503,reactor Tripped Due to Loss of Turbine EHC Fluid Pressure.Caused by Failure of EHC Pump a, Along W/Failure of Standby EHC Pump to Start at Correct Pressure.Defective EHC Pump Replaced (← links)
- 05000424/LER-1993-005, :on 930411,actuation Setpoint for Initiating CVI Not Raised,Per Required Procedure,Resulting in High Radiation Alarm & Cvi.Caused by Personnel Error.Actuation Setpoints for RMs Raised to Proper Values (← links)
- 05000424/LER-1993-003, :on 930316,light 431D,indicating over-temp Delta Temp Turbine Runback Bistable,Lit.Caused by Inadequate Review of Affected Circuitry Prior to Removing Circuit Card.Technicians Counseled (← links)
- 05000424/LER-1993-002-01, :on 930313,lift Setpoint for Valve 1PSV-8010B Was Found to Be in Excess of TS Allowable Limit.Caused by Two Psvs Failing to Maintain Lift Setpoints within 1% Tolerance.Setpoints & Procedures Revised (← links)
- 05000424/LER-1993-001-03, :on 930303,valving Error Caused Opposite Train to Be Inadvertently Removed from Svc.Caused by Cognitive Personnel Error by Ro.Shift Briefings Held to Discuss Event & Importance of Independent Verification (← links)
- 05000424/LER-1991-002-02, :on 910204,during Surveillance Testing of Train B Safeguards Tests Cabinet,Slave Relay Energized,Causing Steam Inlet Valve to turbine-driven Auxiliary Pump to Open. Caused by Personnel Error.Personnel Counseled (← links)
- 05000424/LER-1990-004-01, :on 900301,failure to Comply W/Tech Spec 3.0.4 Occurred on Entry Into Mode 6.Caused by Cognitive Personnel Error.Util Complied W/Action Requirements for Tech Spec 3.9.2 (← links)
- 05000424/LER-1990-003-01, :on 900223,discovered 16 Transformer Core Clamp Bolts Missing on Seismically Qualified Switchgear. Caused by Installation Error During Const Phase of Plant. Missing Clamps Replaced (← links)
- 05000424/LER-1990-002-02, :on 900215,discovered That Train C Auxiliary Feedwater Sys Actuation Relay K266 Improperly Tested.On 900216,discovered That Automatic Diesel Generator Electrical Trip Not Tested.Testing Performed (← links)
- 05000424/LER-1990-001-02, :on 900124,reactor Tripped When MSIV Failed to Reopen Automatically at 10% Closed Position,As Designed & Indicator Illuminated & Position Indication Lost.Caused by Failed Fuses.Fuses Replaced & Switch Adjusted (← links)
- 05000424/LER-1989-020-01, :on 891211,power Removed from Radiation Monitor Before Lifting Leads to ESF Actuation Circuits.Caused by Cognitive Personnel Error & Failure to Follow Procedure. Technician Disciplined.Esf Provisions Planned (← links)
- 05000424/LER-1988-035, :on 881113,momentary Loss of Power to Radiation Monitor 1RE-12116 Resulted in Control Room Isolation Actuation.Setpoint Will Be Raised During Next Refueling Outage (← links)
- 05000424/LER-1988-047, :on 880614,handswitches for Manual Actuation of Containment & Containment Ventilation Isolation Tested.On 891013,handswitches Disabled.Caused by Test Procedure Error.Procedures Re Manual Actuation Revised (← links)
- 05000424/LER-1989-018-01, :on 891002,steam Generator 1 Train a MSIV Failed to Close,Resulting in Automatic Reactor Trip.Caused by Blown Fuse in Control Logic Power Supply.Grounding Corrected & Limit Switch & Fuse Replaced (← links)
- 05000424/LER-2019-001, Engineered Safety Feature Chiller Inoperability Causes Operation in a Condition Prohibited by Tech Specs (← links)
- 05000424/LER-2018-002, Manual Reactor Trip Due to Receiving Rod Control Urgent Failure Alarm During Low Power Physics Testing (← links)
- 05000424/LER-1917-002, Regarding Wiring Error Results in Automatic Actuation of a Safety System (← links)
- 05000424/LER-2017-001, Regarding Manual Reactor Trip Due to Main Steam Isolation Valve Closure (← links)
- 05000424/LER-2016-003, Units I & 2 Regarding Tornado Missile Vulnerabilities Result in Condition Prohibited by Technical Specifications (← links)
- 05000424/LER-2014-004, Regarding Manual Reactor Trip Due to Loss Feedwater Flow (← links)
- 05000424/LER-2014-003, Regarding Failure to Meet Acceptance Criteria of Technical Specification 5.5.11 Ventilation Filter Testing Program (← links)
- 05000424/LER-2014-002, Regarding Unit 1 Manual Reactor Trip Due to Main Steam Isolation Valve Failure (← links)
- 05000424/LER-2014-001, Unit 1, Operation Outside of Pressure and Temperature Limit Report Curve Required by Technical Specification 3.4.3 (← links)
- 05000424/LER-2013-001, Unit 1, Regarding Failure to Comply with Technical Specification LCO 3.8.4 (← links)
- 05000424/LER-2012-005, Regarding Main Steam Isolation Valve Failure (← links)
- 05000424/LER-2012-004, Regarding Unplanned Auxiliary Feedwater Actuation (← links)
- 05000424/LER-2012-003, Regarding Failure to Comply with Technical Specifications LCOs 3.7.14 and 3.0.3 (← links)
- 05000424/LER-2012-002, Regarding Manual Reactor Trip Due to Circuit Board Failure (← links)
- 05000424/LER-2012-001, Regarding Seismically Qualified RWST Aligned to Non-Seismic Piping (← links)
- 05000424/LER-2011-003, Regarding Control Room Air Damper Found Closed Results in Technical Specification Non-Compliance (← links)
- 05000424/LER-2011-002, Regarding Reactor Trip Due to Main Feedwater Regulating Valve Maintenance (← links)
- 05000424/LER-2011-001, Regarding Reactor Trip Due to I a Reactor Trip Breaker Opening (← links)
- 05000424/LER-2010-001, For Vogtle Electric Generating Plant, Regarding Breaker Failure Results in 1B Train Containment Cooling System Being Declared Inoperable (← links)
- 05000424/LER-2009-003, High Main Turbine Vibration Results in Manual Reactor Trip of Unit 1 (← links)
- 05000424/LER-2009-001, Ultimate Heat Sink Inoperable Longer than Allowed by Technical Specifications (← links)
- 05000424/LER-2008-002, Regarding Supplemental Worker Fails to Report Custodial Arrest Resulting in Inappropriate Unescorted Access (← links)
- 05000424/LER-2008-001, Unit 1, Group a Pressurizer Heaters Inoperable During Mode Change (← links)
- 05000424/LER-2007-001, Regarding Auxiliary Contact Blocks on Motor Starter Assemblies Not Being Secured Resulted in the Inability to Meet Their Seismic Qualifications (← links)
- 05000424/LER-2006-004, Regarding ECCS Accumulator 1 Was Determined to Be in a Condition Which Was Prohibited by TS (← links)
- 05000424/LER-2006-003, Re Contract Employee Failure to Self-Disclose Material Information for Unescorted Access (← links)
- 05000424/LER-2006-002, Unit 1 Re Three Technical Specification (TS) Instruments Were Determined to Be in a Condition Which Was Prohibited by TS (← links)
- 05000424/LER-2006-001, Regarding Manual Reactor Trip Due to Loop 3 Main Feed Regulating Valve Control Failure (← links)
- 05000424/LER-2005-004, Manual Reactor Trip Following Main Feed Regulating Valve Failure (← links)
- 05000424/LER-2005-003, Re Feedwater Valve Failure Leads to Reactor Trip (← links)
- 05000424/LER-2005-001, Automatic Reactor Trip Due to Broken Wire Connector (← links)
- 05000424/LER-2003-002, Regarding Ruptured Steam Hose Coupling Leads to Manual Main Steam Line Isolation (← links)
- 05000424/LER-2003-001, Debris in Containment Could Have Resulted in Safety System Loss of Function (← links)
- 05000424/LER-2002-003, Loss of Main Feedwater Leads to Unplanned ESF Actuation and Manual Reactor Trip (← links)
- 05000424/LER-2002-002, Plan, Unit 1 Re Containment Isolation Valve Rendered Inoperable (← links)
- 05000424/LER-2002-001, Re Improperly Wired Interlock Affects ECCS Recirculation Valve (← links)
- 05000424/LER-2001-001-01, Re Reactor Trip Due to Loss of Generator Excitation (← links)
- 05000424/LER-2025-001, Human Performance Error Results in Loss of Main Feedwater Pump and Manual Reactor Trip (← links)
- ML021440212 (redirect page) (← links)
- 05000425/LER-2002-007-02, 2 for Vogtle Regarding Unit 2 Main Generator Tripped Resulting in an Automatic Reactor Trip (← links)
- 05000424/LER-2002-001-01, Re Inadequately Staked Capscrews Render Residual Heat Removal Pumps Inoperable (redirect page) (← links)
- ML033430282 (redirect page) (← links)
- 05000424/LER-2002-001-01 (redirect page) (← links)
- 05000425/LER-2002-002, Steam Generator Level Control Problems Lead to Manual Reactor Trip (← links)
- 05000425/LER-2002-001, Re Unstaked Capscrews Renders Residual Heat Removal Pump Inoperable (← links)
- 05000424/LER-2002-003, Loss of Main Feedwater Leads to Unplanned ESF Actuation and Manual Reactor Trip (← links)
- 05000424/LER-2002-002, Plan, Unit 1 Re Containment Isolation Valve Rendered Inoperable (← links)