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The following pages link to 05000454/LER-2024-001, Both Trains of Control Room Ventilation Temperature Control System Inoperable:
Displayed 13 items.
- ML103620559 (← links)
- ML101970320 (← links)
- ML101050155 (← links)
- ML092440405 (← links)
- ML021330388 (← links)
- ML021330386 (← links)
- ML020990716 (← links)
- ML020490074 (← links)
- IR 05000454/2020401 (← links)
- ML20246G865 (← links)
- ML24249A074 (redirect page) (← links)
- 05000454/LER-2024-001 (redirect page) (← links)
- 05000454/LER-2001-002 (← links)
- 05000454/LER-2001-001 (← links)
- 05000454/LER-1995-001, Informs That SER Issued Using LER 95-001 & Will Not Be Deemed as Ler.Lers 95-007 & 95-009 Will Not Be Used for Docket 50-454.LERs 95-003 Will Not Be Used for Docket 50-455 (← links)
- 05000454/LER-1994-005, Informs That for Docket 50-454,LER 94-005 from Byron Generating Station Will Not Be Used (← links)
- 05000454/LER-1998-018, Corrected LER 98-018-00:on 980912,inoperable Unit 1 DG Was Noted.Caused by Low Lube Oil Pressure Condition.Immediately Entered Into Lcoar for AC Sources TS 3.8.1.1,Action a (← links)
- 05000454/LER-1999-002, Forwards LER 99-002-00,IAW 10CFR50.73(a)(2)(i)(b).There Are Two Actions Remaining to Address Cause of Event.Both Actions Are Listed (← links)
- 05000454/LER-1998-020, Forwards LER 98-020-00 IAW 10CFR50.73(a)(2)(v).Actions to Address Cause of Event Listed (← links)
- 05000454/LER-1999-001, Forwards LER 99-001-00,IAW 10CFR50.73(a)(2)(i)(B).Required Actions to Address Causes of Event Listed (← links)
- 05000454/LER-1998-005, Forwards Revised LER 98-005-00 Which Corrects Errors Involving Incorrect LER Number on Pages 2 Through 5.No New Commitments Made within Submittal (← links)
- 05000454/LER-1998-008, Informs That Licensee Determined That Suppl Rept to LER 98-008 Is Not Warranted.No Addl Info Was Generated Following Completion of Root Cause Investigation of Following Completion of Corrective Actions Stated in Original LER (← links)
- 05000454/LER-1997-011, Provides Addl Info Recently self-identified by Station Personnel Re Corrective Actions Identified in Original LER 97-011.Info Contained in Licensee Re SI Lube Oil Cooler Remain Valid & Basis for Cancelling LER Is Unchanged (← links)
- 05000454/LER-2024-001, Both Trains of Control Room Ventilation Temperature Control System Inoperable (← links)
- 05000454/LER-2023-001-01, A Control Room Ventilation Inoperable Due to Jumpers Left on 0PR031J and 0PR32J (← links)
- 05000454/LER-2023-001, A Control Room Ventilation Inoperable Due to Jumpers Left on 0PR031J and 0PR032J (← links)
- 05000454/LER-2022-001, Ob Control Room Ventilation Supply Fan Failed to Start Due to Erroneous Position Indication from the Closed Limit Switch for Charcoal Deluge Valve Interlock (← links)
- 05000454/LER-2021-001-01, Pressurizer Safety Valves As-Found Lift Pressure Outside of Tech Spec Limit (← links)
- 05000454/LER-2021-001, Re Pressurizer Safety Valves As-Found Lift Pressure Outside of Tech Spec Limit (← links)
- 05000454/LER-2024-002, Reactor Vessel Closure Head Penetration 31 Degraded (← links)
- 05000454/LER-1989-008-08, :on 890830,determined That Auxiliary Feedwater Pump Suction Pressure Switch Setpoints Not within Allowable Values.Root Cause Under Evaluation.Switch Setpoints Set to Conservatively High Values (← links)
- 05000454/LER-1989-005-07, :on 890501,diesel Generator Failed to Load to 5,500 Kw within 60 Due to Deficient post-maint Testing. Caused by Max Fuel Setting on Fuel Control Sys Set Too Low. Fuel Control Sys Properly Adjusted (← links)
- 05000454/LER-1998-011-01, :on 980409,integral Attachment Welds Were Not Inspected IAW ASME Code Due to Deficient ISI Program Plan. Cause of Event Unknown.Byron Site Engineering & Operation Dept Evaluated Operability Issues (← links)
- 05000454/LER-1988-005-01, :on 880804,two Stability Trip Enable Annunciators Actuated Simultaneously in Main Control Room & Output Breakers Opened.Caused by Microwave Noise on Circuit Communicating Grid Status.Power Restricted (← links)
- 05000454/LER-1989-007-07, :on 890803,lightning Caused Transmission Line 0622 to Trip & Initiated Voltage Transient on Electrical Sys.Transmission Line Repaired & Mod Installed in Radiation Monitors (← links)
- 05000454/LER-1989-004-06, :on 890328,diesel Generator 1A Failed to Start During Monthly Operability Surveillance.Caused by Excess Binding Fuel Supply Controls.Injection Pump Metering Rod Cylinders Cleaned & Free Motion Verified (← links)
- 05000454/LER-1989-006-07, :on 890520,area Radiation Monitor ORT-AR056 & Process Radiation Monitors OPR33J & OPR34J Sensed Voltage Transient Condition & Transferred to Interlock Mode.Caused by Three Phase to Ground Fault.Grounds Removed (← links)
- 05000454/LER-1998-017-01, :on 980804,line 0621 Trip & Subsequently,Loss of Unit 1 SATs Causing Loss of Offsite Power,Occurred.Caused by Failure of 94X Relay to Reset After Fault Cleared. Investigate Failure of 94X Relay to Reset (← links)
- 05000454/LER-1997-017-02, :on 971009,degraded Condition of SIS Was Found During Monthly Venting Surveillance.Caused by Failure of 1SI8819C Clcv from 1C SI Accumlator.Si Low Head Piping Was Ultrasonically Examined & Found Water Solid (← links)
- 05000454/LER-1987-018-03, :on 870811,reactor Trip Occurred.Caused by Trip of Main Feedwater Pump Due to Broken Wire on Proximity Probe.Feedwater Supervisory Instrumentation Repaired & Calibr & Automatic Trips on Pumps Disabled (← links)
- 05000454/LER-1987-019-03, :on 870812,safety Injection & Reactor Trip from Low Steam Line Pressure Occurred Due to Failed Main Turbine Throttle.Caused by Failed Moog Servo Valve.Valve Replaced & Procedures Revised (← links)
- 05000454/LER-1987-017-03, :on 870729 & 31,de-energization of Power Supplies in Rod Drive Sys Caused Reactor Trips.Caused by Lightning Strikes.Power Supply Overvoltage Protection Circuits Reset & Verified Operable (← links)
- 05000454/LER-1996-014, :on 960903,failure to Comply W/Design Basis Re Sf Storage Racks Was Noted.Caused by Deterioration as Result of Improper Matl Selection.Controlled SFP Boron Concentration & Silica Concentration (← links)
- 05000454/LER-1998-005-06, :on 980307,manual Reactor Trip Due to Indeterminate Rod Sequencing Problem Occurred.Caused by Failure of Bank Overlap Thumbwheel Switch.Halted Rod Insertion & Manually Initiated Reactor Trip (← links)
- 05000454/LER-1998-016-01, :on 980616,main CR Pressure non-compliance Was Noted.Caused by Inadequate Procedural Directions.Rewrote Procedure Bap 1100-03 & Associated Matrices & Field Use Data Sheets to Ensure Technical Correctness (← links)
- 05000454/LER-1998-015-01, :on 980618,non-licensed Operator Started B Train MCR Ofc Supply Fan That Was Shutdown Due to Lcoar Action Requirements.Caused by Poor Practices.Shutdown MCR Ofc Fans & Taken out-of-svc Immediately (← links)
- 05000454/LER-1987-022-03, :on 871026,area Radiation Monitor Spiked Above Alert Alarm Setpoint,Resulting in Containment Ventilation Isolation Alarm.Caused by Faulty Detector.Detector Replaced & Monitor Returned to Svc on 871029 (← links)
- 05000454/LER-1987-011-01, :on 870415,carbon Dioxide Sys to Auxiliary Feedwater Pump Room Declared Inoperable.Caused by Vapor Pilot Valve Mispositioned,Closed & Not Included on Design Documents.Valve Opened & Placed on Drawings (← links)
- 05000454/LER-1989-002-06, :on 890131,reactor Manually Tripped When Positioner Arm on Feedwater Regulating Valve Disengaged. Caused by Intermittent Oscillations in Valve.Positioner Reconnected Using Locktite & Star Washer (← links)
- 05000454/LER-1987-021-03, :on 870917,control Room Ventilation Actuation Occurred Due to Distribution Sys Voltage Transient When Offsite Line Tripped.Mods Installed in 1985 to Reduce Undervoltage Trip Setpoints on All Process (← links)
- 05000454/LER-1987-020-03, :on 870902,contractor Assigned Continuous Fire Watch Left Assigned Watch Area to Rept for Whole Body Count Processing.Caused by Cognitive Personnel Error.Personnel Given Sheet Listing Responsibilities (← links)
- 05000454/LER-1987-016-05, :on 870831,inadvertent Train a Safety Injection Occurred During Surveillance Test.Caused by Personnel Error. Disciplinary Action Given to Involved Nuclear Station Operators (← links)
- 05000454/LER-1998-007-01, :on 980306,process Sampling Valve 1PS9354A Was Found W/Packing Leak.Caused by Personnel Error That Did Not Verify Adequate Testing.Declared Subject Valve Inoperable, Entered LCO & Will Revise Procedures (← links)
- 05000454/LER-1998-005-01, :on 980307,manual RT Due to Indeterminate Rod Sequencing Problem Was Noted.Cause Is Undetermined.Halted Rod Insertion,Manually Initiating RT & Exercising Bank Overlap Thumbwheel Switch to Clean Contacts (← links)
- 05000454/LER-1998-008-01, :on 980305,manual RT Due to Loss of Communication During Rod Drop Testing Was Noted.Caused by Procedure Deficiency.Revised Tp to Require Appropriate Use of Voice Amplifiers (← links)
- 05000454/LER-1997-023, :on 971229,1B DG Control Power Wiring Discrepancy Occurred Due to Mod Installation Error & Programmatic Deficiencies.Caused by Failure to Use self-check Principles.Counseled Technician (← links)
- 05000454/LER-1998-004-01, :on 980228,determined That Plugged Drain in Reactor Incore Instrumentation Seal Table Room Had Not Been Properly Evaluated.Caused by Inadequate Written & Oral Communications.Temporary Alteration Installed (← links)
- 05000454/LER-1998-010-01, :on 980318,failure to Perform in Service Testing After Maintenance Was Noted.Caused by Poor Communication.Problem Identification Form B1998-01335 Was Initiated on 980320,to Investigate Event (← links)
- 05000454/LER-1998-009-01, :on 980318,TS Test Was Missed Due to Failure to Follow Procedure.Caused by Personnel Error.Operations Department Head Will Discuss Rept W/All Mgt & Operators (← links)
- 05000454/LER-1987-015-03, :on 870526,automatic Start of Auxiliary Feedwater Pump Occurred.Caused by Personnel Error. Disciplinary Action Taken & Operator Involved Counseled.W/ (← links)
- 05000454/LER-1997-015-03, :on 970813,containment Penetration Test,Vent & Drain Valves Were Not Surveilled within 31 Days.Caused by Difference in Interpretation of Regulations.Surveillance Applied to All Valves (← links)
- 05000454/LER-1987-016-03, :on 870526,during Mode 3,both Trains of Containment Spray Additive Sys Discovered Inoperable.Caused by Two Locked Open Isolation Valves Mispositioned Due to Procedural Deficiency.Valve Repositioned (← links)
- 05000454/LER-1986-035, :on 861217,investigation of Possible Part 21 Rept on Cooper Bessemer Ksv Series Emergency Diesel Generators Revealed Nonseismic Switches Had Been Wired Into Engine Overspeed safety-related Trip Circuit (← links)
- 05000454/LER-1986-028-02, :on 861002,reactor Manually Tripped.Caused by Defective Firing Card & Intermittent Failure of Alarm Card. Rod Drive Sys Troubleshot,Responsible Circuit Cards Replaced & Alarm Cleared (← links)
- 05000454/LER-1987-012-02, :on 870408,contract Maint Crew Stroked RHR HX Component Cooling Water Outlet Isolation Valve,Causing Surge Tank to Reach Low Level CC Pump Trip.Caused by Communication Breakdown Between Maint Crew & Shift Personnel (← links)
- 05000454/LER-1987-009-05, :on 870408,inadvertent Safety Injection Signal Generated During Reactor Protection Sys Surveillance Testing.Caused by 2 of 4 Coincidence Logic Due to Loose Test Lead.Personnel Cautioned (← links)
- 05000454/LER-1986-026-01, :on 860921,actuation of Control Room Ventilation Occurred.Caused by Lightning Strike on Offsite 138 Kv Transmission Line.Mods Installed in 1985 to Reduce Undervoltage Trip Setpoint (← links)
- 05000454/LER-1986-012-01, :on 860327,RPI Surveillance Not Performed within 4 H.Caused by Personnel Error.Bank Demand Vs Digital RPI Surveillance Reinstated (← links)
- 05000454/LER-1984-031-01, :on 841215,boron Dilution Protection Sys Actuated.Caused by Electrical Noise Spikes.Triaxial Cable Connectors Disassembled & Cleaned & Heavier Gauge Grounding Wire Installed on Cabinets (← links)
- 05000454/LER-1984-010, :on 841112 & 19,noise Spikes Occurred on Source Range Channel N31 Resulting in Boron Dilution Protection Sys Actuation.Caused by Personnel Error.Operator Awareness Enhanced & Note Added to Procedures (← links)
- 05000454/LER-1984-019-01, :on 841127,boron Dilution Protection Sys Actuated,Resulting in Charging Pump Suction Switchover to Rwst.Caused by Electronic Noise Spike.Triaxial Cable Connectors Disassembled & Cleaned (← links)
- 05000454/LER-1986-007, :on 860212,process Radiation Monitor 0PR34J Went Into Interlock Mode Due to Noise Spike on Monitor Gas Channel.Caused by Bad Edge Component or Connector on Motherboard.Motherboard Replaced (← links)
- 05000454/LER-1987-014-03, :on 870505,mode Change Inoperable Steam Generator Occurred Due to Misplugged Tube.Caused by Personnel Error.Tube Plugged & Verified Correct.Personnel Counseled (← links)
- 05000454/LER-1987-013-03, :on 870501,reactor Trip Signal Occurred During Control Rod Position Surveillance.Caused by Momentary Loss of Level Simulation Due to Bumping of Simulation Mechanism. Precaution to Simulation Surveillance Added (← links)
- 05000454/LER-1986-029-03, :on 861022,480-volt Breaker,Providing Overcurrent Protection for Electrical Penetration Feed to Containment Crane 1HC22G,discovered Not Tested Prior to Entry Into Mode 4.Caused by Personnel Error (← links)
- 05000454/LER-1986-030-03, :on 861023,sampling Period for Inoperable Radiation Monitor Delayed for 12 H.Caused by Personnel Error,Memo Issued Reemphasizing Notification Procedures.W/ (← links)
- 05000454/LER-1987-010-05, :on 870419,Tech Spec 3.0.3 Entered Due to Two Trains of Main Control Room Ventilation Being Inoperable. Caused by Drift of High Differential Pressure Switch. Differential Pressure Switch Recalibr (← links)
- 05000454/LER-1987-011-03, :on 870415,auxiliary Feedwater Pump Room Sys Inoperable.On 870416,vapor Pilot Valve Discovered Closed.On 870404,vapor Pilot Valve Demonstrated Open During Inadvertent CO2 Actuation Event.Cause Unknown (← links)
- 05000454/LER-1986-024-02, :on 860725,w/plant in Power Operation Mode 1, Main Control Room Outside Air Intake a Process Radiation Monitor Went Into Interlock Mode.Caused by Noise Spike on Monitor Particulate Channel (← links)
- 05000454/LER-1986-035-02, :on 861217,notice Received of Possible Part 21 Rept Re Cooper Bessemer Diesel Generators.Investigation Revealed That non-seismic Switches Wired Into Engine Overspeed.Caused by Design Error (← links)
- 05000454/LER-1986-032-02, :on 861208,ESF Response Time Surveillance Discrepancy Noted in Procedure Resulting in Violation of Tech Specs.Caused by Procedure Incorrectly Timing High Steam Pressure Rate Logic Circuitry (← links)
- 05000454/LER-1986-031-03, :on 861121,maint Re Breaking of Nonexempt ASME Code Class 3 Pressure Boundary Strainer Completed & Returned to Svc W/O Required post-maint Visual Exam.Caused by Personnel Error.Visual Exams Performed (← links)
- 05000454/LER-1986-022-03, :on 860703,during Required Shutdown to Mode 5 Due to Excessive RCS Unidentified Leak,Source Range Nuclear Instrumentation Channels Improperly Declared Operable.Caused by Personnel Error (← links)
- 05000454/LER-1986-027-03, :on 860930,reactor Tripped Following Feedwater Isolation & Turbine Trip Due to Damaged Test Cable.Caused by Personnel Error.Damaged Cable Repaired & Temporary Cable Will Be Installed (← links)
- 05000454/LER-1987-002-07, :on 870114,main Control Room Outside Air Intake a Process Radiation Monitor Went Into Interlock Mode Due to Failed Automatic Checksource Test on Iodine Channel. Checksource Positioning Mechanism Realigned (← links)
- 05000454/LER-1987-003-02, :on 870111,equipment Attendant Recorded Failure of Fire Alarm But Failed to Immediately Notify Shift Engineer That Acceptance Criteria Not Met.Caused by Personnel Error.Personnel Counseled (← links)
- 05000454/LER-1987-001-06, :on 870111,radioactive Release Tank Not Sampled Prior to Release Per Tech Spec 4.11.1.1.1.Caused by Personnel Error.Radiation Chemistry Technician Counseled & Tanks Relabeled (← links)
- 05000454/LER-1986-025-02, :on 860826,Tech Spec 3.12.1 Re Radiological Environ Monitoring Not Met.Caused by Personnel Error.Suppl to 1985 Annual Radiological Environ Operating Rept Will Be Submitted (← links)
- 05000454/LER-1987-008-04, :on 870324,Train B Automatically Switched to Safeguards Mode During Switching Process.Caused by Safeguard Signal.Cause of Signal Unknown.Procedures Revised (← links)
- 05000454/LER-1986-034-03, :on 861212,radiation Detector to Train B Found Defective.Detector Replaced.On 861215,discovered Leads Restored to Wrong Terminals.Caused by Personnel Error. Personnel Counseled (← links)
- 05000454/LER-1986-033-03, :on 861209,post-maint Visual Leak Test Not Performed,Violating Tech Spec.Caused by Defective Procedure. Project Const Now Working Under Station Nuclear Work Request Program (← links)
- 05000454/LER-1986-021-03, :on 860614,performance of RCS Water Inventory Balance Exceeded Tech Spec Action Statement by 1 H & 27 Minutes.Caused by Personnel Misinterpretation of Requirement.Personnel Counseled (← links)
- 05000454/LER-1987-007-04, :on 870316,hourly Firewatch Started Late Thereby Exceeding Requirements of Tech Spec.Caused When Radiation Protection Personnel Issued Neutron Dosimetry to Technician 20 Minutes Late.Personnel Counseled (← links)
- 05000454/LER-1986-018-03, :on 860602,main Control Room Outside Air Intake Process Radiation Monitor a Went Into Interlock Mode. Caused by Misaligned Check Source Mechanism.Mechanism Realigned (← links)
- 05000454/LER-1986-016-03, :on 860527,following Installation of Backup Electrical Power Supply,Continuous Fire Watch Inadvertently Released from Post.Caused by Personnel Error.Engineer Instructed on Fire Watch Procedures (← links)
- 05000454/LER-1987-006-03, :on 870311,monthly Fire Protection Valve Lineup Surveillance Incorrectly Scheduled.Caused by Failure to Consider All Tech Spec Scheduling Requirements.Use of Existing Computer Program Mandated (← links)
- 05000454/LER-1987-005-04, :on 870310,contractor Personnel Inadvertently Damaged Fire Protection Sprinkler Head.Sus Isolated & Declared Inoperable.Caused by Procedural Deficiency. Formalized Training Provided (← links)
- 05000454/LER-1987-004-05, :on 870225,safety Injection Occurred During Maint Troubleshooting.Caused by Personnel Error.Disciplinary Action Taken Against Personnel Involved & Other Instrument Maint Personnel Counseled (← links)
- 05000454/LER-1986-023-03, :on 860718,discovered Installation of Defective Pressurizer Safety Valve as Result of Excessive Seat Leakage on 860717.Caused by Series of Personnel Errors.Secure Storage Cages Constructed (← links)
- 05000454/LER-1998-001-04, :on 980202,failure to Test ESF Logic Circuit Noted.Caused by Oversight by Initial TS Reviewers.Sys Engineering Wrote Special Procedures,Tested Reserve Feed Contacts & Will Write or Revise Surveillances (← links)
- 05000454/LER-1986-019-03, :on 860630,discovered That power-range Nuclear Instrumentation Channel Not Fully Tripped within 6 H of Declaring Channel Inoperable.Caused by Personnel Error. Procedures Revised (← links)
- 05000454/LER-1986-020-02, :on 860702,RCS Leakage Exceeded Tech Specs. Caused by Failed Packing Diaphragms on Isolation Valve. Entire Valve Cut Out & Replaced (← links)
- 05000454/LER-1986-012-02, :on 860327,4 H Surveillance of Digital Rod Position Indication Vs Bank Demand Position Indication Mistakenly Stopped.Caused by Personnel Error.More Specific Instructions on Daily Orders Instituted (← links)
- 05000454/LER-1997-022-03, :on 971114,determined That Ssps Logic Testing Had Not Been Performed.Caused by Inadequate Testing Design. Added New Testing Criteria to Ssps bi-monthly Surveillance Procedures & Successfully Performed Testing (← links)
- 05000454/LER-1986-010-03, :on 860318,w/plant in Mode 1,main Control Room Outside Air Intake B Process Radiation Monitor OPR34J Went Into Interlock Mode Due to Loss of Sample Flow.Caused by Sample Pump Shutdown Due to Bumping Switch (← links)
- 05000454/LER-1986-002, :on 860126 & 0204,w/plant in Mode 1,process Radiation Monitor OPR31J (Main Control Room Outside Air Intake a) Went Into Interlock Mode Due to Spike on Monitor Iodine Channel.Caused by Bad Component (← links)
- 05000454/LER-1997-019-03, :on 971028,potential Failure of Westinghouse Fuel Was Noted.Caused by Inadequate Design Code.Reviewed & Improved Analytical Models,Gathered Data & Performed Plant by Plant Assessments (← links)
- 05000454/LER-1997-021-03, :on 971028,CR Door Was Removed & non-seismically Qualified Structure Was Relied on to Maintain Pressure Boundary.Caused by Inadequate Procedure. Temporary Barrier Was Provided (← links)
- 05000454/LER-1997-020-03, :on 970930,excessive Operator Response Times Were Noted Due to Inadequate Analysis Implementation.Caused by Inadequate procedure.E-3 Was Revised to Suspend Transition to FR-P.1 (← links)
- 05000454/LER-1997-023-03, :on 971229,discovered That 1B EDG Wired in Configuration,May Have Continued to Operate,If Fire Had Occurred in Zones 11.5-0 or 11.6-0.Caused by Error on Part of Technician Installing.Technician Counselled (← links)
- 05000454/LER-1986-017-03, :on 860602,both Trains of Main Control Room Ventilation Sys Inoperable.Caused by Setpoint Drift on Train a Makeup Fan & Bent Spring Release on Train B Supply Fan Breaker.Setpoint Recalibr & Spring Repaired (← links)
- 05000454/LER-1997-018-03, :on 971023,discovered That Two Unit 1 Vent Valves Not Included in Procedure.Caused by Mgt Deficiency. Permanent Procedure Change Submitted (← links)
- 05000454/LER-1997-017-03, :on 971009,completion of Shutdown Was Initiated.Caused by Degraded Condition of Safety Injection Sys Found.Caused by Failure of Cold Leg Check Valve. Leak-rate Determination Performed (← links)
- 05000454/LER-1986-004-01, :on 860131 & 0205,outside Diameter Auxiliary Bldg Charcoal Booster Fan Automatically Started W/O Proper Signal.Caused by Failure of Westinghouse AR-3 Relay in Fan Breaker Closing Circuitry.Leads Moved (← links)
- 05000454/LER-1986-015-03, :on 860507,discovered Test Voltage for Verifying Neutron Flux Multiplication for Boron Dilution Protection Sys Incorrect.Caused by Inadequate Procedures. Interim Procedure SPP-86-71 Written (← links)
- 05000454/LER-1997-016-04, :on 971007,projected SG Leak Rate Combined with TS Limit for Dose Equivalent Iodine Creates Potential for Operation Outside Design Basis.Caused by Projected Leakage & Leakrate Limits.Sg Are Being Replaced (← links)
- 05000454/LER-1986-014-03, :on 860512,main Control Room Outside Air Intake Process Radiation Monitor a Went Into Interlock Mode.Caused by Clogged Particulate Sample Filter.Filter Interval Changed (← links)
- 05000454/LER-1985-091, :on 851009,auxiliary Bldg Charcoal Booster Fan Automatically Started.Output Contact from Energized Unit 2 ESF Relay Not Properly Isolated from Unit 1 Associated Equipment.Caused by Installation Error (← links)
- 05000454/LER-1998-020-01, :on 981118,analysis Error in Boron Dilution Protection Sys Code Identified.Caused by Personnel Error. Replacement of Bdps Function with Volume Control Tank Level Monitoring & Operator Actions Evaluated (← links)
- 05000454/LER-1997-019, :on 971028,potential Failure of W Fuel Were Noted.Caused by Inadequate Methods & Incorrect Assumptions in Fuel Rod Design Code.W Has Developed Comprehensive Plan to Resolve Fuel Rod Internal Pressure Issue (← links)
- 05000454/LER-1999-001-05, :on 990422,depressing Both Feedwater Isolation Reset Pushbuttons Leads to LCO 3.0.3 Entry.Caused by Implementation Error in Procedure Review for Conversion to Its.Review of Procedures Will Be Conducted (← links)
- 05000454/LER-1997-014-03, :on 970612,identified Lack of Proper Testing of P-11 Interlock Circuitry.Caused by Improper Development of Instrument Maint Dept Surveillance Procedure to Properly Test P-11 Function.Procedures Revised (← links)
- 05000454/LER-1988-010-08, :on 881105,safety Injection Accumulator Fill Line Break Due to Fatigue Requiring Plant Shutdown Per Tech Specs.Caused by Fatigue Induced Cracking.Accumulator Fill Lines Dye Penetrant Insp.Flawed Pipes Replaced (← links)
- 05000454/LER-1999-003-02, :on 990513,automatic Reactor Occurred Due to Human Error During Surveillance Procedure.Appropriate Mgt Action Taken with Instrument Maint Involved & Sp Bsir 3.1.6-200 Revised.With (← links)
- 05000454/LER-1999-002-03, :on 990509,missed TS Surveillance Was Noted. Caused by Error in Design Package.Changed Monthly Surveillance Procedure for Containment Isolation Valves (← links)
- 05000454/LER-1986-013-03, :on 860423,containment Air Lock Leakage Rate Surveillance Performed Late Due to Misapplication of Tech Spec 4.0.2.Caused by Personnel Error.Computer Program Revised to Require Testing Every 6 Months (← links)
- 05000454/LER-1988-007-10, :on 880919,loss of Shutdown Cooling During Reactor Cavity Level Lowering Evolution Occurred.Caused by Failure to Comprehend Fluid Restriction When Upper Assembly Full Seated.Training Sessions Initiated (← links)
- 05000454/LER-1988-008-07, :on 880921,radiation Monitor Detected Alert Radiation Condition During Movement of Reactor Vessel Upper Internals Assembly.Caused by Raising Reactor Vessel Upper Internals Assembly.Procedure Will Be Revised (← links)
- 05000454/LER-1998-008-04, :on 980912,inoperable Unit 1 DG Noted.Caused by Low Lube Oil Pressure Condition.Immediately Entered Into Lcoar for AC Sources TS 3.8.1.1 Action A.With (← links)
- 05000454/LER-1986-005-02, :on 860129,loss of Sample Flow Alarm Occurred & on 860130,radioactive Liquid Release Started.Loss of Sample Flow Alarm Due to Sample Pump Seal Failure.Sample Pump Rebuilt (← links)
- 05000454/LER-1986-004-03, :on 860131 & 0205,auxiliary Charcoal Booster Fan Automatically Started W/O Receipt of Valid Start Signal. Caused by Failure of Westinghouse AR-3 Relay in Fan Breaker Closing Circuitry (← links)
- 05000454/LER-1988-002-11, :on 880418,reactor Tripped Due to Rod Drop During Manual Control Rod Motion.Caused by Intermittent Component Failure in Rod Control Sys.Movable Gripper Coil & Lift Coil Power Bridge Thyristors Replaced (← links)
- 05000454/LER-1988-006, :on 880826,fuel Handling Bldg Booster Fan Actuated & Dampers Aligned to Filter Fuel Handling Bldg Monitor Sensed Undervoltage Condition & Transferred to Interlock Mode.Caused by Voltage Transient (← links)
- 05000454/LER-1987-018-01, :on 870811,main Feedwater Pump Thrust Bearing Wear Annunciator Activated in Main Control Room.Caused by Broken Wire on Proximity Probe.Feedwater Pump Supervisory Instrumentation Repaired & Recalibr (← links)
- 05000454/LER-1986-003-01, :on 860129,reactor Trip & Auxiliary Feedwater Actuation Occurred.Caused by Grounded Conditions on Positive & Negative Poles of 125 Volt Dc Bus.Reservoir Mods & Updates to Filling Procedures Planned (← links)
- 05000454/LER-1988-005-09, :on 880804,stability Trip Enable Annunciators & Unit Stability Generator Trip Annunciator Actuated Resulting in Reactor Trip.Caused by Microwave Noise. Stability Generator Trips Disabled (← links)
- 05000454/LER-1988-004-11, :on 880716,main Feedwater Pump 1B Tripped & Steam Generator Levels Decreased.Caused by Feedwater flow- Steam Mismatch & Loss of turbine-driven Feedwater Pump. Failed Diodes & Resistors Replaced (← links)
- 05000454/LER-1987-017, :on 870729 & 31,reactor Trips from High Negative Flux Rate Occurred.Caused by Lightning Strikes.Mods to Lightning Protection Sys Made (← links)
- 05000454/LER-1985-101, :on 851227,reactor Tripped Due to High Steam Generator Level.Caused by Lack of Explicit Procedural Identification of Feedwater Flow Control Loop Switch Position Prior to Calibr.Procedure Revised (← links)
- 05000454/LER-1988-003-11, :on 880613,essential Svc Water Makeup Pump Inoperable for Greater than 72 H.Caused by Inaccurate Electrical Distribution Book.Book Will Be Reviewed & Revised.Several Procedures Will Be Revised (← links)
- 05000454/LER-1996-019-05, :on 961015,insp Revealed That Silt Accumulations Exceeded Surveillance Acceptance Criteria. Caused by Silt Buildup.Silt Buildup Acceptance Criteria in Surveillance Has Been Revised (← links)
- 05000454/LER-1997-012-04, :on 970529,required Plant to Be Shutdown within 48 H Per Ts.Caused by MSIV Active Train Not Being Repaired within 48 H.Four Way Valve Was Replaced (← links)
- 05000454/LER-1988-001-07, :on 880209,control Room Ventilation Actuation Occurred Due to Main Control Room Outside Air Intake B Process Radiation Monitor Gas Channel Spike.Cause Unknown. Ventilation Sys Returned to Normal (← links)
- 05000454/LER-1997-003-02, :on 970218,equipment Hatch Gallery Was Not Properly Attached to Containment Structure.Caused by Original Construction Deficiency.Unit 1 Containment Equipment Hatch Gallery Will Be Restored (← links)
- 05000454/LER-1986-009, :on 860222,during Cold Shutdown,Containment Vent Isolation Occurred Due to Undervoltage Condition at Radiation Monitors 1RT-AR011 & 1RT-AR012.Caused by Voltage Transient on 345 Kv Distribution Sys (← links)
- 05000454/LER-1986-006-02, :on 860212,control Room Ventilation Sys Train B Shifted to ESF Actuation on Signal from Control Room Air Intake Monitor ORE-PR033.Caused by Procedural Error During Monitor Filter Change.Checklist Implemented (← links)
- 05000454/LER-1986-007-02, :on 860212,process Radiation Monitor OPR34J Went Into Interlock Mode Due to Noise Spike on Monitor Gas Channel.Cause of Noise Spike Unknown.Troubleshooting Being Performed to Determine Cause (← links)
- 05000454/LER-1992-006-07, :on 920728,discovered That Pump Discharge Check Valves in Component Cooling & RHR Sys Not Being Tested,As Required by GL 89-04.Caused by Personnel Error.Affected Valves Backflow Tested W/No Problems Noted (← links)
- 05000454/LER-1985-096, :on 851207,incorrect Containment Pressure Loops Utilized to Fulfill post-accident Monitoring Requirements, Per Tech Spec 3/4.3.3.6.Caused by Personnel Error.Complete Calibr on Loops Performed.Procedure Revised (← links)
- 05000454/LER-1997-010-03, :on 970527,faulty Review Caused Failure to Test Relays & TS 3.0.3 Entry.Caused by Defective Site Review in 1990.Selected TS Surveillances Are Being Reviewed (← links)
- 05000454/LER-1997-011-04, :on 970527,missing Support on Oil Cooler Caused SI Pump to Be Inoperable Due to Work Process Deficiency.Post Maint Verifications Will Be Added to Model Work Request to Provide Clear Insp (← links)
- 05000454/LER-1986-011-02, :on 860324,main Control Room Outside Air Intake Process Radiation Monitor B Went Into Interlock Mode Due to High Vacuum Alarm.Caused by Clogged Sample Particulate Filter.Filters on Radiation Monitors Changed (← links)
- 05000454/LER-1997-009-04, :on 970522,TS Surveillance Was Missed.Caused by Mgt Error.Weekly Ultrasonic Testing Insp of Vulnerable Areas in Cv Discharge Pump Is Being Performed & Will Continue Until TS Change Approved (← links)
- 05000454/LER-1986-002-04, :on 860126 & 0204,control Room Ventilation Actuation Occurred Due to Process Radiation Monitor OPR31J Iodine Channel Spike.Iodine Channel High Voltage Power Supply & Circuit Boards Replaced (← links)
- 05000454/LER-1997-013-03, :on 970522,valve Mistakenly Opened & Caused post-LOCA Leakage to Exceed Limit.Cause Unknown.Licensee Identified Affected Sys & Procedures That Vent or Open Affected Sys (← links)
- 05000454/LER-1997-008-03, :on 970403,defective Breakers Were Installed in Equipment Feed Cubicles & Placed Into Svc After Receipt from Mfg.Caused by Inadequate Quality Process in Place to Control Repair of Srs.Breakers Replaced (← links)
- 05000454/LER-1986-008, :on 860217,turbine Generator & Reactor Trips Occurred Due to Phase Differential Current Sensed by Main Transformer.Caused by Ice Buildup on Transmission Line Tower During Ice Storm.Transformer Replaced (← links)
- 05000454/LER-1985-050, :on 850505,discovered That Surveillance Requirements for Tech Spec 3.2.5 Not Recorded Every 12 H. Temporary Procedure 85-1-383 Approved Immediately.Facility in Violation of Requirements Since 850224 (← links)
- 05000454/LER-1985-090, :on 851009,reactor Tripped Due to False Low Flow Signals from RCS Loop 1D.Caused by Venting Loop Flow Transmitter.Calibr of Reactor Coolant Flow Loop Being Revised to Restrict Work on Transmitters (← links)
- 05000454/LER-1985-084-01, :on 850924,fire Watch Delayed.Caused by Key Stuck in Vital Area Door Lock.Fire Watch Resumed After Another Security Person Arrived to Attend Door.Lock Repaired (← links)
- 05000454/LER-1985-060, :on 850616,refueling Water Storage Tank (RWST) Water Temp 103 F.Caused by Personnel Error in Not Observing Procedures for Placing RWST Heater Pump in & Out of Svc.New Procedure Being Written (← links)
- 05000454/LER-1997-014, :on 960903,failure to Comply W/Design Basis Due to Degradation of Boraflex in Sf Racks Was Identified.Review of SFP Criticality Analysis & Addl Controls & Reviews of Externally Generated Calculations Established (← links)
- 05000454/LER-1985-095, :on 851107,w/unit in Cold Shutdown,Inadvertent Auto Start of Diesel Generator 1A Occurred During Auxiliary Bldg Ventilation Sys ESF Logic Surveillance.Caused by Temporary Procedure.Procedure Revised (← links)
- 05000454/LER-1985-081, :on 850731,following Completion of RHR Pump Operability Surveillance,Rhr Sys Declared Inoperable.Caused by Testing Valve Lineup That Allowed Only Two of Four Cold Legs to Be Available During Accident (← links)
- 05000454/LER-1985-088, :on 850908 & 11,process Radiation Monitors OPR34J & OPR33J,respectively,went Into Interlock Mode.Caused by Noise Spike on Monitor Gas Channels.Train B Ventilation Sys Transferred to ESF Configuration (← links)
- 05000454/LER-1985-086, :on 850829,MSIVs Declared Inoperable.Caused by Environmentally Unqualified Terminal Strips Located in Junction Boxes on Msivs.Strips Removed & Wires Reattached (← links)
- 05000454/LER-1985-070, :on 850724,during ASME Quarterly Surveillance Test for Train B RHR Pump (1RH01PB),pump Upper Motor Bearing Vibration Exceeded Limits.Caused by Motor Imbalance Placing Force on Motor Runner (← links)
- 05000454/LER-1986-001-06, :on 860116,reactor Trip Occurred Due to Ambiguities in Temporary Procedure.Caused by Insufficient Detail in Procedure to Distinguish Between Two Nearly Identical Auto Shunt Trip Test Panels (← links)
- 05000454/LER-1985-093, :on 851027,125-volt Dc Battery Bank & Charger Operability Weekly Surveillance Affecting 111,112 & 125-volt Dc Battery Bank & Charger Not Performed within Required Time Interval.Caused by Personnel Error (← links)
- 05000454/LER-1985-094, :on 851028,process Radiation Monitor Went Into Interlock Mode Due to Check Source Test Failure.Caused by Malfunctioning Iodine Detector.Detector Replaced (← links)
- 05000454/LER-1985-061, :on 850624,reactor Trip Occurred Due to Steam Generator 1A LO-2 Level.Caused by Attendant Inadvertent Activation of Local Overspeed Trip Bar for Feedwater Pump 1C.Trip Lever Handles Removed (← links)
- 05000454/LER-1985-082, :on 850811,waste Gas Sys Samples Not Obtained & Analyzed.Caused by Personnel Error.New Communication & Limiting Condition for Operation Action Statement Handling Mechanisms Implemented (← links)
- 05000454/LER-1985-079, :on 850809,core Axial Flux Difference (Afd) Not Logged Hourly Following Restoration of computer-generated Afd Alarm.Caused by Personnel Error.Afd Monitor Alarm Inoperable Surveillance Procedure Revised (← links)
- 05000454/LER-1997-004-01, :on 970215,thrust Bearings Were Installed Backwards on Rh & CS Pumps Due to Lack of Specific Sys/Component.Completion of Nwrs Written to Check End Play on Rh & CS Pump Motors Will Be Tracked (← links)
- 05000454/LER-1985-072, :on 850717,project Engineering Dept Notified Station That All Environmentally Qualified Limitorque Operators,W/Base Lubricant,Unqualified.Base Grease Removed & Replaced W/Calcium Grease (← links)
- 05000454/LER-1985-007, :on 850111,radiation Monitors OPR33J,OPR34J, 1RT-AR012 & ORT-AR056 Went Into Interlock Condition Due to Voltage Transient Caused by Starting of Circulating Water Pump 1B.Undervoltage Setpoint Lowered (← links)
- 05000454/LER-1985-080, :on 850806,determined That Tech Spec Surveillance 1BOS 3.1.1-2 Did Not Account for Feedwater Tempering Line Flow.Caused by Omission from Operating Calometric Procedure.Procedure Changed (← links)
- 05000454/LER-1985-098, :on 851209,ESF Actuation of Main Control Room Ventilation Sys Occurred Due to Deenergization of Train a Radiation Monitors.Root Cause of Common Feedbreaker Trip to Monitor Undetermined.Event Terminated (← links)
- 05000454/LER-1985-100, :on 851211,Fire Door D-633 Found Blocked by Electrical Cord by Contractor Const Personnel.Cord Removed & Door Locked.Personnel Attended Retraining Session Re Importance of Fire Protection (← links)
- 05000454/LER-1985-097-01, :on 851208,inadvertent Safety Injection Occurred.Caused by Personnel Procedural Error.Operators Instructed to Independently Verify Steps of Procedure (← links)
- 05000454/LER-1997-002-04, :on 970211,480 Vac Breakers Were Found in Remove Position Instead of Qualified Disconnect Position. Caused by Failure of Mgt to Implement Measures to Assure Work Practices Were Maintained.Revised Acbs (← links)
- 05000454/LER-1985-092, :on 851016,during Security Computer Outage, Fire Watch Delayed 20 Minutes Due to Vital Area Door Lock Failure.Caused by Loosening of Set Screw in Cylinder.Lock Will Be Replaced (← links)
- 05000454/LER-1997-001-04, :on 970131,failed to Perform Surveillance on Testing on Hydrostatic on Dg.Caused by Inadequate Tracking Mechanism.Developed & Executed Special Surveillance Procedures & Will Enhance TS Interpretation (← links)
- 05000454/LER-1985-083, :on 850820,RCS Water Inventory Surveillance Not Performed within Required Time Interval.Caused by Inadequate Review of Surveillances Listed on Surveillance Schedule. Shift Engineers Reprimanded.Event Reviewed (← links)
- 05000454/LER-1985-067, :on 850711,oxygen Concentration in Waste Decay Tank OD Exceeded Tech Spec 3.11.2.5 Limit of 2%.Caused by Leak in Gas Decay Tank Oa Manual Release Valve.Nuclear Work Request B20396 Written to Repair Valve (← links)
- 05000454/LER-1985-078, :on 850807,during Delta I Calibrs,Reactor Tripped on Power Range High Negative Flux Rate.Caused by Personnel Error.Instrument Maint Dept Personnel Counseled & Surveillance Procedures Revised (← links)
- 05000454/LER-1985-077, :on 850807,area Radiation Monitor ORT-AR056 Went Into Interlock Mode Due to Voltage Transient.Caused by Starting Circulating Water Pump 1B,resulting in Auto Start of Ob Fuel Handling Bldg Charcoal Fan (← links)
- 05000454/LER-1985-076, :on 850805,radiation Monitor OPR31J Went Into Interlock Mode.Caused by Check Source Test Failure.Work Request Written to Repair Check Source & Monitor Returned to Normal Operating Status (← links)
- 05000454/LER-1984-043, :on 841031,seal Injection Header Test Connection Valves 1CV066B & 1CV067A Repaired,Replaced & Returned to Svc Prior to Performance of Inservice Insp. Caused by Failure to Follow Procedures (← links)
- 05000454/LER-1985-011-01, :on 850111,discovered Safety Injection Trains Feeding Cold Leg Injection Isolated.Caused by Closing of Isolation Valves Due to Concern Re Overpressurizing Rcs. Temporary Procedure Change Request Initiated (← links)
- 05000454/LER-1985-075, :on 850801,equipment Hatch Personnel Airlock Leakage Rate Exceeded Tech Spec Limit.Caused by Procedural Inadequacy Leading to Deficient Testing Conditions.Local Leakage Rate Testing Procedures Revised (← links)
- 05000454/LER-1985-074, :on 850729,automatic Actuation of Fuel Handling Bldg Charcoal Booster Fan Occurred When Power Disrupted. Caused by Operator Error.Caution Card Placed at Breakers & Work Request to Correct Label Written (← links)
- 05000454/LER-1996-019-02, :on 961015,SX Cooling Tower Basins,Diver Insp Revealed That Silt Accumulations Exceeded Acceptance Criteria.Caused by Inadequate Acceptance Criteria in Insp. Silt from UHS Removed (← links)
- 05000454/LER-1985-073, :on 850722,feedwater Isolation Occurred Due to High Level in Steam Generator 1B.Caused by Surge in Indication Level in Response to Sudden Momentary Drop in Steam Header Pressure & Increase in Steam Flow (← links)
- 05000454/LER-1985-071, :on 850717,main Steam Line Isolation Signal Initiated During Steam Generator 1B Testing.Caused by Incorrect Procedure Allowing Redundant Pressure Rate Bistables to Be Tripped.Test Procedure Revised (← links)
- 05000454/LER-1985-069, :on 850714,reactor Trip & Loss of Automatic Safeguards Actuation on Train B Occurred.Caused by Personnel Error.Power Supplies Reenergized & Solid State Protection Sys Repaired (← links)
- 05000454/LER-1985-068, :on 850713,lightning Strike Resulted in Reactor Trip & Damage to Listed Train B Safeguards Instrumentation. Caused by Induced Voltage Transient on Station Ground & Rod Drive Power Failures.Lightning Sys Mods Made (← links)
- 05000454/LER-1985-066, :on 850712,operating Temp Delta T Trip Setpoint Exceeded During Load Rejection Testing,Causing Reactor Trip & Control Room Ventilation Makeup Fan auto-start.Caused by Inaccurate Stroke Times of Steam Dump Valves (← links)
- 05000454/LER-1985-063, :on 850708,control Rod P-8 Misaligned.Decision to Trip Turbine Caused Reactor Trip Because Permissive P-7 Not Actuated.Reactor & Turbine Power Below 10%.Impulse Pressure Rescaled (← links)
- 05000454/LER-1985-065, :on 850709,process Radiation Monitor OPR33J Went to Interlock Mode on Two Occasions.Caused by Inadvertent Bumping of Pump Flow Control Switch.Handles to Air Intake Monitors Removed (← links)
- 05000454/LER-1985-089, :on 850913,both Trains of Control Room Ventilation Inoperable.Caused by Workers Misreading HVAC Ductwork Drawings.Project Const Dept Will Review HVAC Drawing Conventions W/Personnel Responsible (← links)
- 05000454/LER-1985-062, :on 850627,automatic Reactor Trip Initiated on Overtemp Differential Temp.Caused by Loss of Two Tripped Circulating Water Pumps.Control Circuits Replaced & Separated Into Three Cabinets (← links)
- 05000454/LER-1984-015, :on 841125,gas Grab Sample Not Obtained While Vent Stack Monitor 1RE-PR028 Inoperable,Per Tech Spec Action Statement.Caused by Personnel Error.Control Room Personnel Counseled on Proper Action Statement Requirements (← links)
- 05000454/LER-1984-007-03, :on 841110,grab Samples Not Obtained Every 12 H While Vent Stack Radiation Monitors Inoperable,Per Tech Spec Limiting Condition for Operation.Cause Not Stated.Personnel Counseled on Importance of Taking Required Samples (← links)
- 05000454/LER-1984-002-01, :on 841105,surveillance Requirements Not Performed Re Recording of RHR Train Flow & Operability. Caused by Operator Oversight of Surveillance Requirements & Improper Supervisory Review.Personnel Counseled (← links)
- 05000454/LER-1984-001-01, :on 841104,hourly Fire Watch for Penetration Seals Not Performed.Caused by Insufficient Manpower to Adequately Perform Fire Patrols & Supervisor Decision to Leave Patrols Understaffed.Supervisors Counseled (← links)
- 05000454/LER-1985-064, :on 850704,voltage Transient Tripped Power Failure Alarm,Initiating Containment Ventilation Isolation. Transient Caused by Start of Circulating Water Pump 1B.Mods Will Be Made to Radiation Monitor Sensitivity (← links)
- 05000454/LER-1985-087, :on 850902,four Auxiliary Bldg Sprinkler Sys Did Not Alarm When Tested & 10 H Elapsed Before Surveillance Entered.Caused by Failure of Equipment Attendants to Inform Shift Engineer (← links)
- 05000454/LER-1996-022-02, :on 961205,alarm Setpoints for Fuel Handling Incident Area Radiation Monitors Did Not Meet TS Due to Personnel Error.Setpoints Revised,Ufsar Rev Issued & Review to Determine How to Address Setpoint Initiated (← links)
- 05000454/LER-1985-085, :on 850829,determined That Two ASME Code Class 2 Welds in Safety Injection Sys Not Examined Per ASME Requirements.Caused by Misidentification of Weld for Exam. Relief from Requirements Granted on 850903 (← links)
- 05000454/LER-1995-005, :on 951010,discovered Fire Protection Rept Discrepancies.Caused by Inadequate Evaluations During Preparation of Original Analysis.Established Hourly Fire Watches & Installed Darmatt KM1 Fire Barrier (← links)
- 05000454/LER-1996-011, :on 960702,manual Reactor Trip Occurred Due to Loss of Instrument Air to Feedwater Preheater Bypass Isolation Valve.Failed Tubing Was Replaced Under Work Request (← links)
- 05000454/LER-1985-048, :on 850424,radiation Monitor OPR32J in Main Control Room Outside Air Intake a Went Into Interlock Mode, Causing Train a of Ventilation Sys to Transfer to ESF Configuration.Caused by Dirty Filter (← links)
- 05000454/LER-1985-049, :on 850424,Train a Main Control Room Ventilation Sys Transferred to Makeup Mode of Operation. Cause of ESF Actuation Unknown.Ventilation Isolation Restored to Normal Operating Status (← links)
- 05000454/LER-1985-053, :on 850525,reactor Trip Occurred Due to lo-lo Steam Generator Meter Level.Caused by Dirt & Filings Shorting Windings of Transformer in Inverter.Inverter Replaced (← links)
- 05000454/LER-1996-014-01, :on 960903,failure to Comply with Design Basis Occurred,Due to Degradation of Boraflex in Spent Fuel Racks.Controls Placed on SFP Boron Concentration & Silica Concentration (← links)
- 05000454/LER-1985-054, :on 850524,reactor Trip Occurred Due to Turbine Trip on Low Auto Stop Oil Pressure.Caused by Fouled Return Line Strainers & Inadequate Overflow Capacity.Insp & Cleaning Program Established (← links)
- 05000454/LER-1992-002-01, :on 920403,discovered Loss of One of Two ESF Unit Crossties.Caused by Personnel Error.Procedure for cross-tie Breakers Revised (← links)
- 05000454/LER-1985-052, :on 850522,reactor Tripped at 50% Power. Caused by Turbine Trip When Electrical Fault in Unit 2 Sys Auxiliary Transformer Actuated Improperly Set Differential Relay for Unit 1 Main Power Transformer (← links)
- 05000454/LER-1985-051, :on 850521,reactor Trip Produced Due to Turbine Impulse Pressure Greater than 10% W/Turbine Throttle Valves Closed.Caused by Inadequacy in Station Power Ascension Procedure.Procedure Revised (← links)
- 05000454/LER-1985-058, :on 850519,one Hourly Fire Watch Patrol Not Conducted.Caused by Personnel Assignment Error.Disciplinary Actions Taken.Addl Security Sergeant Assigned to Supervise & Ensure Proper Fire Watch Performance (← links)
- 05000454/LER-1985-047, :on 850417,RCS Unidentified Leakage Exceeded Max Allowed Value.Caused by Leakage in Diaphragm Valves in Chemical & Vol Control Sys Letdown Flowpath.Flowpath Removed from Operation & Isolated.Valves Tightened (← links)
- 05000454/LER-1985-057, :on 850528,fire Watch Patrols Restricted from Performing Rounds of Auxiliary Bldg.Caused by ALARA Concerns Due to Gaseous Radiation Release While Venting Vol Control Tank.After Survey,Fire Watches Resumed (← links)
- 05000454/LER-1985-059, :on 850517,hourly Fire Watch Delayed When Two Fire Patrols Combined to Perform Dual Verification of Security Doors.Caused by Security Computer Failure. Self-locking Security Doors Installed (← links)
- 05000454/LER-1985-045, :on 850410,reactor Coolant Sample Taken 7 H & 45 Minutes After Reactor Trip Contrary to Tech Specs.Caused by Personnel Error.Shift Engineer Notified & Sample Collected & Analyzed (← links)
- 05000454/LER-1985-046, :on 850421,reactor Tripped Due to Steam Generator Lo-2 Level.Caused by Auxiliary Relay Sticking in Energized Position Producing Isolation of Feedwater Control Valves.Relays Replaced (← links)
- 05000454/LER-1985-056, :on 850515,CECo Engineering Notified Station That Rupture of Common Blowdown Line to Condenser or high-energy Auxiliary Steam Sys Line Could Produce Unacceptably Harsh Environ.Flowrate Reduced (← links)
- 05000454/LER-1985-055, :on 850515,containment Floor Drain Isolation Valves 1RF026 & 1RF027 Declared Inoperable When Xomox Valve Manufacturer Reported That Valves Not Seismically Qualified. Brackets Installed on Valves (← links)
- 05000454/LER-1984-012-01, :on 841110,five Radiation Monitors Lost Power. Caused by Power Down of non-ESF Electrical Bus.Power Supply Book Revised to Correctly Indicate Electrical Feeds to Monitors (← links)
- 05000454/LER-1992-007-09, :on 920727,discovered Nonconservative Method Used to Calculate Shutdown Margin.On 920818,determined That TS 3.1.1.1 Not Met for Surveillance Performed on 900211. Caused by Procedural Flaw.Procedure Revised (← links)
- 05000454/LER-1984-043-02, :on 841031,two Seal Injection Header Test Connection valves,1CV066B & 1CV067A,discovered to Be Returned to Svc W/O Required Inservice Insp.Caused by Failure to Follow Procedures.Personnel Trained (← links)
- 05000454/LER-1985-041, :on 850412,Train B Main Control Room Ventilation Sys Automatically Realigned to Makeup Mode. Caused by Personnel Error.Individual Counseled (← links)
- 05000454/LER-1985-043, :on 850410,fire Watches in Auxiliary Bldg Suspended for 3 H Due to Evacuation.Caused by ALARA Concerns Following Rupture of Boric Acid Evaporator Rupture Disk.Area Surveyed by Health Physics Personnel (← links)
- 05000454/LER-1985-044, :on 850403,discovered Tech Spec Limiting Condition for Operation Action Statement Not Entered for Containment Isolation Valve Maint & Time Test Not Performed. Caused by Staff Error.Procedure Specs Issued (← links)
- 05000454/LER-1985-039, :on 850402,reactor Trip Occurred Due to Steam Generator 1B LO-2 Level.Caused by Loss of Feedwater Flow from Feedwater Pump 1B.Procedure Used for Power Ascension Revised (← links)
- 05000454/LER-1985-042, :on 850329 & 0410,reactor Tripped Due to Four Shutdown Bank a Group 1 Rods Losing Gripper Coil Current & Falling Into Core.Caused by Faulty Circuit Card in CRD Logic Cabinet.Card Replaced (← links)
- 05000454/LER-1996-012-01, :on 960717,TS Action Settlement Not Entered for Tornado Watch.Caused by Frequent Job or Task Shuffling, Tailgate Sessions Conducted to Address Event (← links)
- 05000454/LER-1985-036, :on 850327,radiation Monitors OPR34J & 1RT-AR012 Went Into Interlock Mode Due to Power Failure. Caused by Voltage Transient Due to Bushing Failure on Offsite Transformer (← links)
- 05000454/LER-1985-040, :on 850319,control Room Ventilation Sys Tech Spec Limiting Condition for Operation Action Statement Not Entered within Required Time Limit When Train a Process Radiation Monitor Not Available (← links)
- 05000454/LER-1996-011-01, :on 960702,1B SG Preheater Bypass Valve Failed Closed.Caused by Inadequate Feedwater to 1B Sg.Failed Tubing Replaced (← links)
- 05000454/LER-1992-008-08, :on 921001,incomplete Auxiliary Feedwater Surveillance Testing Discovered During Review of Surveillance Program.Caused by Procedural Deficiency. Procedures Revised (← links)
- 05000454/LER-1985-038, :from 850117-0331,CO2 Fire Protection Sys Valve Alignment Not Verified Per Tech Specs.Caused by Surveillance Coordinator Error.Surveillance Coordinator Instructed to Check Failed Surveillances (← links)
- 05000454/LER-1985-032, :on 850314,low Pressure Feedwater Heater Nonreturn Check Valve 14C Discovered Improperly Installed. Caused by Const Installation Error.Valve Reinstalled Correctly (← links)
- 05000454/LER-1985-035, :on 850314,during Plant Recovery Following Loss of Offsite Power Test,Safety Injection Occurred Due to Low Steam Line Pressure.Caused by Operational Condition of Plant (← links)
- 05000454/LER-1985-037, :on 850323,while Plant Operated in Mode 5,main Control Room Outside Air Intake Radiation Monitor OPR33J Went Into Interlock Mode.Caused by Dirty Particulate Filter. Filters Now Changed Daily (← links)
- 05000454/LER-1996-003-10, :on 960417,identified Defective Tubes.Cause Undetermined.Removed Defective Tubes Either by Plugging or Sleeving (← links)
- 05000454/LER-1995-005-01, :on 951010,identified Fire Protection Discrepancies.Caused by Inadequate Evaluations During Preparation of Original Analysis.Continued Hourly Fire Watches & Installed Darmatt KM 1 Fire Barrier (← links)
- 05000454/LER-1992-036, :on 920701,DG 1A Load Dropped to Approx 3,000 Kw & Load Starting Fluctuating,Resulting in Generator Reverse Power Trip.Caused by Mispositioning of Contacts 5 & 6.Relay & Potentiometer Replaced (← links)
- 05000454/LER-1984-033-03, :on 841218,26,30,850102 & 10,gas Monitor Channels on Radiation Monitors OPR34J & OPR33J Went Into High Radiation &/Or Interlock Alarm,Due to Externally Generated Noise.Cause of Noise Unknown (← links)
- 05000454/LER-1984-032-03, :on 841221,fire Penetration W/Four Conduit Pipes Discovered Improperly Sealed.Cause Not Stated. Penetration Sealed & Fire Watch Established (← links)
- 05000454/LER-1992-005-09, :on 920724,discovered That Previous TS Setpoint of 3,804 Volt Ac safety-related Equipment May Not Have Started or Operated If ESF Voltages Degraded.Caused by Incomplete Calculation.Setpoint Changed (← links)
- 05000454/LER-1996-013-02, :on 960815,determined Atmospheric Radiation Monitor Alarm Setpoint Did Not Meet Design Criteria.Cause Unknown.Setpoint Changes Were Completed (← links)
- 05000454/LER-1984-031-04, :on 841215,17 & 19,boron Dilution Protection Sys Actuated.Caused by Electrical Noise Spikes on Nuclear Power Source Range Channels.After Origin Determined,Operator Realigned Charging Pump Suction to Line Up (← links)
- 05000454/LER-1985-028, :on 850304,reactor Tripped Due to Manual Turbine Trip.Caused by Abnormally Fluctuating Generator Output.Training Dept Will Emphasize That Turbine Power May Vary from Generator MW Output (← links)
- 05000454/LER-1996-008-01, :on 960528,fuel Assemblies Located in Incorrect Region of Spent Fuel Pool Identified.Caused by Cognitive Personnel Error.Performance Expectations Discussed W/Persons Involved (← links)
- 05000454/LER-1985-034, :on 850318,during MSIV Operability Test, Operator Accidentally Actuated Manual Safety Injection Handswitch Instead of Manual Main Steam Isolation Handswitch.Operators Reminded to Read Labels (← links)
- 05000454/LER-1985-033, :on 850314,particulate Filter & Iodine Cartridge Collected from Auxiliary Bldg Vent Stack Monitors 1RE-PR028 & 2RE-PR028 Not Analyzed as Required by Tech Spec Table 4.11-2.Caused by Personnel Error (← links)
- 05000454/LER-1984-042-02, :on 841031,data Sheet Incomplete for Surveillance 4.7.10.3.1 Not Accounting for electro-manual Pilot Control for Valve.Caused by Typo.River Screen House CO2 Sys Walked Down & Procedure Revised (← links)
- 05000454/LER-1984-030-03, :on 841218,instrument Bus 111 Deenergized & Boron Dilution on Protection Sys Actuated Due to Deenergization of Nuclear Instrumentation Channel I.Caused by Shorted Capacitor in Control Circuitry (← links)
- 05000454/LER-1984-034-03, :on 841227,discrepancy in Number of Sources Received on 841221 Discovered.Caused by Rad/Chem Technician Comparing Package Contents to DOT Sticker Instead of Packing List.Procedures Being Revised (← links)
- 05000454/LER-1985-023-01, :on 850227,automatic Safety Injection Actuation Occurred.Caused by Improper Calibr of Digital electro- Hydraulic Controllers & Valve Interlocks.Valve Positions Recalibr (← links)
- 05000454/LER-1985-025, :on 850301,emergency Trip Header Low Pressure Reactor Trip Surveillance Not Performed within Required Interval Prior to Reactor Startup.Caused by Surveillance Schedule Program Not Listing Applicable Mode (← links)
- 05000454/LER-1984-025-04, :on 841213,reactor Trip Occurred Due to Instrumentation Calibr of Turbine Impulse Pressure Channel. Caused by Procedural Error.Instrumentation Calibr Surveillance Procedure Revised (← links)
- 05000454/LER-1996-003-09, :on 960507,safety Injection Pump Exceeded Max Flow.Caused by Defective Procedure.Developed Correlation Between Pump Suction Parameters & Flow (← links)
- 05000454/LER-1996-001-10, :on 960313,found Controlled Leakage Flow Rates Outside Tech Specs Allowed Limit.Caused by Inaffective Corrective Actions from 960125 Event.Throttled 1CV8369A,B,C & D,Seal Injection Water Flow Valves (← links)
- 05000454/LER-1995-011-01, :on 951107,current Insp Results Identified Increased Tube Degradation in Sgs.Cause Unknown.Defective Tubes Removed from Svc by Plugging or Sleeving (← links)
- 05000454/LER-1984-023-04, :on 841208,during Digital Rod Position Indication Surveillance,Single Control Rod in Control Bank D Moved Out of Core.Caused by Reversed CRD Mechanism Coils. Wiring Corrected (← links)
- 05000454/LER-1984-028-03, :on 841207,gas Monitor Channels of Radiation Monitors OPR32J & OPR36J Went Into High Radiation & Interlock Alarm.Apparently Due to Externally Generated Electrical Noise.Alarms Reset (← links)
- 05000454/LER-1984-027-04, :on 841212,21 & 22,main Control Room Outside Air Intake Gas Monitor Channels OPR32J,OPR33J,OPR36J Received High Radiation & Interlock Alarms During Filter Change.Caused by Noise at Controllers (← links)
- 05000454/LER-1996-005-04, :on 960423,identified Potential Operating Alignment Problem Associated W/Safety Injection Accumulators.Caused by Mgt Deficiency.Procedures Revised.W/ (← links)
- 05000454/LER-1984-029-02, :on 841205,VC Sys Makeup Fan Automatically Started & Sys Switched to Makeup Mode.Caused by Trip & Interlock Actuation of Process Radiation Monitors Being Serviced.Monitors Restarted & VC Sys Restored (← links)
- 05000454/LER-1984-024-04, :on 841129,both Radiation Monitoring Sys CRT Displays in Control Room Became Inoperable,Resulting in Loss of Indication & Alarm for Monitors W/O Dedicated Monitors. Caused by Particulate Buildup on Filters (← links)
- 05000454/LER-1984-026-04, :on 841202,boron Dilution Sys Blocked for Longer than Tech Spec Limits.Caused by Channel N31 Being Out of Svc & Channel N32 Being Blocked for Trouble Shooting of Noise Spikes for 63 Minutes (← links)
- 05000454/LER-1996-003-08, :on 960417,results of Insp Classified Each of Four Model D-4 SGs as Category C-3 Based on 3,855 Tubes Being Defective as Defined in Tssr 4.4.5.2.Cause Not Determined (← links)
- 05000454/LER-1984-022-05, :on 841129,boron Dilution Protection Sys (Bdps) Actuations Occurred Four Times Because of Surveillances on Source Range Instruments.Caused by Bdps Not Blocked. Surveillance Revised (← links)
- 05000454/LER-1984-021-05, :Between 841127 & 1203,main Control Room Process Radiation Monitors Failed Automatic Check Source Tests,Causing Ventilation Sys to Switch to ESF Mode.Caused by Insufficient Tolerance in Setpoints (← links)
- 05000454/LER-1984-018-06, :on 841128,HVAC Outside Air Vent Fan Started During Filter Change.Caused by Monitor Tripping During Filter Change.Procedures Revised So Filter Changes Will Not Cause Radiation Monitors to Trip (← links)
- 05000454/LER-1984-019-05, :on 841127,boron Dilution Protection Isolation Sys Actuated.Caused by Noise Spike on Source Range Channels. Westinghouse Requested to Investigate Means of Filtering Out Noise Spikes (← links)
- 05000454/LER-1985-019, :on 850128,monthly Surveillance of Containment Isolation,Containment Radioactivity,High Radiation Monitors Not Performed at Required Interval.Action Statement of Limiting Condition for Operation Entered (← links)
- 05000454/LER-1985-018, :on 850204,fire Protection Detectors Discovered to Be Inconsistent W/Layout Prints & Tech Specs. Caused by Ae Error Due to Oversight.Fire Watch Established & Tech Specs Revised (← links)
- 05000454/LER-1996-002-07, :on 960321,containment Spray Additive Flowed Outside TS Required Range.Caused by Incorrect Testing Methodology Specified in Procedure.C/A:Revised Methodology Test Performed (← links)
- 05000454/LER-1985-017, :on 850119,PORV Block Valves Not Deenergized During RCS Leak Test.Caused by Misinterpretation of Tech Spec Limiting Condition for Operation.Personnel Briefed (← links)
- 05000454/LER-1985-016, :on 850124,reactor Trip Occurred.Caused by Instrument Mechanic Grounding Strip Chart Recorder Connector Using Incorrect Size for Connectors.Surveillances Performed to Verify Proper Operation of Trains (← links)
- 05000454/LER-1985-012, :on 850117,Tech Spec Surveillance for Steam Generator Blowdown Containment Isolation Valves Found Past Critical Date Re Valve 1SD005C.Caused by Testing of Improper Valve on 850108.Surveillance Program Modified (← links)
- 05000454/LER-1985-015, :on 850131,five Valves Found Outside of Acceptable Lift Setting Range.Caused by Const Activity Adjacent to Safety Valves.Valves Adjusted to Proper Setting (← links)
- 05000454/LER-1985-013, :on 850124,position Indication Test for Valve 1SI8809A Outside of Surveillance Interval.Caused by Omission of Valve from Revised Safety Injection Sys Position Indication Test Surveillance.Procedure Revised (← links)
- 05000454/LER-1996-001-08, :on 960313,determined That Unrecognized Change in Sys Flow Resulted in Operation Outside TS Allowed Limit Due to Ineffective C/A That Followed 960125 Event.Throttled 1CV8369A,B,C & D Seal Injection Water FCVs (← links)
- 05000454/LER-1985-011, :on 850111,both Safety Injection Trains Feeding Cold Injection Isolated.Caused by Personnel Error.Dept Heads Notified of Importance of Procedural Adherence & Changes (← links)
- 05000454/LER-1985-005, :on 850111,daily Surveillance of Diesel Generator 2A Not Performed.Caused by Personnel Error. Surveillance Performed & Licensed Operators Reminded to Perform Required Surveillances on Schedule (← links)
- 05000454/LER-1985-009, :on 850108,main Steam Line Isolation Caused by Technician Performing Work on Incorrect Steam Pressure Channel.Plant Operation Unaffected.Event Discussed W/ Technician & at Instrument Dept Meeting (← links)
- 05000454/LER-1985-008, :on 850104,reactor Trip & Auxiliary Feedwater Actuation Occurred Due to Steam Generator lo-lo Alarm. Operators Inadvertently Allowed Level to Drop in Steam Generator While Engaged in Shift Turnover (← links)
- 05000454/LER-1985-006, :on 850106 & 10,while Venting Containment to Reduce Internal Pressure,Both Containment Mini Purge Supply & Exhaust Lines Opened in Violation of Tech Specs.Caused by Use of Wrong Procedure (← links)
- 05000454/LER-1984-020, :on 841125 & 28,source Range Channel N32 Indicated Noise Spikes on Four Occasions,Resulting in Containment Evacuation Alarms.Cause Under Investigation. Source Range Channel Modified (← links)
- 05000454/LER-1985-001-02, :on 850103,auxiliary Bldg Vent Stack Monitor Tripped Due to Filter Loading.Caused by Personnel Error. Particulate Filter Collected from Monitor But Not Analyzed as Required to Meet Tech Specs (← links)
- 05000454/LER-1984-039-03, :on 841225,radiation Monitor OPR33J Loss of Sample Flow Alarm Caused Control Room Ventilation Sys to Switch to Makeup Mode.Caused by Operator Prematurely Stopping Ventilation Purge.Operator Counseled (← links)
- 05000454/LER-1984-003-01, :on 841107,signal Spiking Seen on Both Source Range Channels.Caused by Electrical Noise Generated by or Induced Onto Sys.Source Range Channel Modified & Cleaned (← links)
- 05000454/LER-1984-040-02, :on 841225,reactor Trip Breakers Manually Opened Due to Greater than 12-step Difference Between Digital Rod Position Indication & Demand Step Counters. Caused by Stuck Step Counter (← links)
- 05000454/LER-1985-004, :on 850102,during Mode 5,component Cooling Sys Surge Tank Level Rapidly Decreased Due to Const Personnel Unbolting RHR Sys HX Flange.Caused by Improper Review of out-of-svc Procedures (← links)
- 05000454/LER-1985-003-01, :on 850111 & 12,reserve Offsite Transmission Circuits Unavailable & Periodic Surveillance of Remaining Circuits Not Performed.Caused by Personnel Error (← links)
- 05000454/LER-1984-021-02, :on 841127,main Control Room Ventilation Sys Switched to ESF Mode.Caused by Main Control Room Process Radiation Monitors Failing Automatic Check Source Tests Due to Insufficient Tolerance in Check Setpoints (← links)
- 05000454/LER-1984-038-03, :on 841231,control Room Ventilation Sys Switched to make-up Mode of Operation.Caused by Spurious High Radiation & Interlock Alarm on Radiation Monitor OPR34J.Noise Suppression Devices Installed (← links)
- 05000454/LER-1985-002, :on 850109,gas Monitor Channels on Radiation Monitor OPR33J Went Into High Radiation.Caused by Externally Generated Electrical Noise.Source of Noise Spike Unknown. Investigation Underway (← links)
- 05000454/LER-1984-036-03, :on 841226,diesel Generator 1B Inoperable W/ Centrifugal Charging Pump 1B Operable.Caused by Personnel Error.Personnel Involved Reminded to Verify Plant Status When Making Equipment Inoperable (← links)
- 05000454/LER-1984-035-03, :on 841226,control Room Ventilation Train B Makeup Air Filter Unit Fan Started W/O Automatic Start Input Signals.Caused by Bumped Control Switch.Guardrails Installed to Prevent Inadvertent Starts (← links)
- 05000454/LER-1984-037-03, :on 841226,gas Monitor Channels of Radiation Monitor OPR34J Went Into Interlock Due to Loss of Vacuum Alarm.Cause Unknown.Alarms Reset Automatically (← links)
- 05000454/LER-1984-013-06, :on 841128,during Surveillance Testing,Fuel Oil Level Reduced to 93.5%,below Tech Spec 93.8% Limit. Caused by Running Diesel Generator for 64 Minutes.Storage Tanks Refilled & Procedures Revised (← links)
- 05000454/LER-1984-020-06, :on 841125 & 30,while in Mode 5,containment Evacuation Alarm Occurred.Caused by Source Range Channel N32 Noise Spikes.Work Underway to Suppress or Eliminate Source Range Noise Spikes (← links)
- 05000454/LER-1984-017-07, :on 841123,train a Safety Injection (SI) Actuated.Caused by Operator Placing Main Control Board Safety Injection Switch in Incorrect Position.Addl Training Re Protection Sys Initiated (← links)
- 05000454/LER-1984-014-06, :on 841121,12 H Grab Samples from Process Monitors Not Obtained Per Tech Specs.Caused by Personnel Error.Tighter Administrative Controls Implemented (← links)
- 05000454/LER-1984-015-07, :on 841125,auxiliary Bldg Vent Stack Monitor Inoperable & Gas Grab Sample Missed.Caused by Personnel Error.Control Room Personnel & rad-chem Foremen Required to Verify Action Prior to Sampling Termination (← links)
- 05000454/LER-1995-008-01, :on 951109,inadequate Test for Compliance with Llrt.Caused by a Procedure That Did Not Adequately Identify That Plugs Were Removed.C/A:Procedure Revision Initiated and Maint Foreman Counseled (← links)
- 05000454/LER-1984-016-06, :on 841121,during insp,125-volt 1E Batteries Declared Inoperable.Caused by Battery to Rack Spacing Exceeding Manufacturer Physical Seismic Test Parameter Limit.Spacers Added to Gap (← links)
- 05000454/LER-1984-008-07, :on 841115,fire Watch in Diesel Storage Tank Rooms Terminated Before Fire Protection Foam Sys Reestablished.Caused by Poor Communication.Fire Watch Established & Sys Returned to Svc (← links)
- 05000454/LER-1984-010-08, :on 841112,boron Dilution Protection Sys Actuated.Caused by Noise Spike Due to Pulling Fuse.Mod to Boron Dilution Protection Sys Being Designed (← links)
- 05000454/LER-1984-009-08, :on 841116,auxiliary Bldg Vent Stack Monitor 1RE-PR028 Tripped Due to Filter Loading.Particulate Filter & Iodine Cartridge Not Analyzed within 48 H Because of Lack of Instructions from Lab Foreman to Technician (← links)
- 05000454/LER-1984-011-06, :on 841108,all Communications W/Radiation Monitor OPR31J Lost in Control Room.Caused by Two Terminals Accidentally Shorting During Repairs.Work Request Written & Damaged Components Replaced (← links)
- 05000454/LER-1984-004-08, :on 841108,process Radiation Monitor ORE-PR031B for Oa Control Room HVAC Outside Air Intake Failed.Train Ob Started (← links)
- 05000454/LER-1984-005-08, :on 841106-07,block Wall Between Control Room Area & Auxiliary Bldg Discovered Open.Block Wall Penetration Sealed,Control Room Pressure Boundary Walked Down & Two Addl Leaky Penetrations Sealed (← links)
- 05000454/LER-1984-006-07, :on 841109,control Room HVAC Sys Unable to Maintain Positive Pressure.Caused by Operation of Auxiliary Bldg HVAC in Abnormal Lineup.Auxiliary Bldg HVAC Sys Restored to Normal Lineup (← links)
- 05000454/LER-1984-007-08, :on 841110,11 & 12,grab Samples Not Taken. Caused by Personnel Error.Personnel Counseled on Importance of Taking Samples as Required by Tech Specs (← links)
- 05000454/LER-1984-002-08, :on 841106,surveillance Requirements Not Performed to Record RHR Train Flow & Operability.Caused by Operator Oversight & Improper Review by Shift Supervisory Personnel.Personnel Cautioned (← links)
- 05000454/LER-1984-001-08, :on 841104,hourly Fire Watch Patrol Not Executed in Areas W/Degraded Fire Barriers.Addl Instruction Re Staffing for Fire Watches Provided to Security Supervisors (← links)
- 05000454/LER-1984-003-08, :on 841107,during Initial Core Loading,Signal Spiking Seen on Both Source Range Channels.Source Range Channels Declared Inoperable.Caused by Electrical Noise on Sys or Induced Onto Sys.Fix Being Investigated (← links)
- 05000454/LER-1985-031, :on 850308,reactor Trip Occurred Due to Steam Generator 1B lo-2 Level.Caused by Trip of Feedwater Pump 1B During Investigation of Lube Oil Problem.Instruments Recalibr (← links)
- 05000454/LER-1985-030, :on 850313,during up-power Maneuver to 10%, Steam Generator narrow-range Level Decreased to 4% Above lo-lo Setpoint.Caused by Low Feedwater Suction Pressure.Automatic Bypass Mod in Progress (← links)
- 05000454/LER-1985-029, :on 850305,reactor Trip Occurred Due to Trouble Shooting by Instrument Maint Personnel.Caused by Personnel Error.Training Class for Technicians Re Reactor Trip Logic Will Be Conducted (← links)
- 05000454/LER-1985-026, :on 850228,radiation Monitor 1PR11J Left Isolated from Containment Atmosphere After Maint Activity on Valve 1PR001B.Administrative Controls Implemented to Ensure Sys Integrity/Proper Restoration After Maint (← links)
- 05000454/LER-1985-024, :on 850301,turbine/reactor Trip Occurred.Caused by Inability of Turbine electro-hydraulic Controller to Properly Position Governor Valves to Pick Up Generator Load. Load Vs Valve Position Curve Revised (← links)
- 05000454/LER-1985-021-01, :on 850217,security Computer Failed,Preventing Hourly Fire Watch.Cause Unknown.Key Will Be Issued to Fire Watch Personnel When Computer Access Cannot Be Obtained (← links)
- 05000454/LER-1985-022-01, :on 850218,reactor Trip Occurred Due to High Positive Rate on Power Range ex-core Neutron Detector. Caused by Lower Detector on One Channel Failing & Other Channel Being Out of Svc for Testing (← links)
- 05000454/LER-1985-020-01, :on 850215,spurious Safety Injection Actuation Occurred.Caused by Maint on Pressure Channel & Spurious Trip of Second Pressure Channel Believed to Be Caused by Radio. Radios No Longer Allowed within Containment (← links)
- 05000454/LER-1984-041-01, :on 841031,ultraviolet Detector in Zone 38 Failed to Annunciate & Fire Catch Not Initiated Until 841212.Caused by Inoperability of Detector.Replaced Detector Not Proven Operable (← links)
- 05000454/LER-1992-004-10, :on 920701,received an Operability Assessment Re Bdps.Caused by Inadequate Safety Analysis & Subsequent Review for Bdps.Special Operating Order Was Revised to Implement Conditions for Operability (← links)
- 05000454/LER-1992-002-11, :on 920403,loss of One of Two ESF Unit Crossties Noted.Caused by Personnel Error.Review of Electrical non-technical Surveillances Performed & Procedures Revised (← links)
- 05000454/LER-1995-006-10, :on 951028,surveillance Was Missed During SG Tube Insp.Caused by Cognitive Personnel Error.Counselled Cognizant Engineer on Responsibilities Re SG Work (← links)
- 05000454/LER-1995-010-08, :on 951113,chemistry Sample for Lcoar Was Not Done within Specified Time Limit Due to de-energized Closed Valve.Closed Circuit Breaker & Sample Was Taken (← links)
- 05000454/LER-1995-008-07, :on 951109,discovered That Inadequate Tracking of Brass Plugs for Fuel Transfer Tube Flange Prevented Proper Llrt.Plugs Will Be Physically Inventoried After Installation of Flange (← links)
- 05000454/LER-1995-011-05, :on 951105,discovered Increased Tube Degradation in Sgs.Caused Not Determined.Defective Tubes Will Be Removed from Svc by Plugging or Sleeving & Suppl Rept on Root Cause Will Be Submitted (← links)
- 05000454/LER-1995-005-10, :on 951010 & 13,identified Fire Protection Rept (FPR) Discrepancies Due to Inadequate Evaluations During Preparation of Original Safe Shutdown Analysis.Criteria for Reporting Deficiencies in FPR Established (← links)
- 05000454/LER-1990-014-04, :on 901203,actual Feedwater Isolation Signal Generated During Performance of Slave Relay Surveillance 1BOS 3.2.1-980,causing Loss of Feedwater.Caused by Personnel Error.Switch S817 Replaced (← links)
- 05000454/LER-1995-004-10, :on 950928,resistance for Intercel Connection of 125 Volt Batteries Had Not Been Measured Due to Procedural Deficiency.Revised Surveillance to Include Measurement of Resistance from Connection (← links)
- 05000454/LER-1995-003-10, :on 950913,containment Leak Detector Was Inoperable.Caused by Misinterpretation of TS Requirements by Shift Control Room Engineers Involved.Wrote Daily Order to Identify Correct Interpretation of TS 3.4.6.1 (← links)
- 05000454/LER-1992-001-09, :on 920129,Unit 1 Reactor Tripped.Caused by Incorrect Tagging of Isolated Valve.Tags Were Replaced W/Correct Ones (← links)
- 05000454/LER-1995-002-11, :on 950818,Unit 1 Train B H Monitor Was Found Inoperable Due to Isolated Water Trap.Removed Unit 1 Train B H Monitor Line Caps (← links)
- 05000454/LER-1991-006-10, :on 911114,determined That Testing of 4160 Volt ESF Bus Undervoltage Relay Circuits Inadequate.Caused by Inadequate Testing Procedures.Surveillance Procedures Will Be Revised (← links)
- 05000454/LER-1990-007, :on 900612,discovered That Steam Line Isolation Handswitch on Main Control Board Panel Not Tested During Past Refueling Outage.Caused by Use of Deficient Procedure.All Contacts on Switches Tested (← links)
- 05000454/LER-1991-005-08, :on 911027,Mode 4 Entered W/Containment Spray Sys & ECCS Recirculation Sump Isolation Valves Inoperable. Caused by Control Room Personnel Failure.Mode Change Checklists Will Be Revised (← links)
- 05000454/LER-1991-004-12, :on 911016,Train B SI,1B DG & Several Other Pieces of Equipment Actuated.Caused by Cognitive Personnel Error.Procedures Will Be Revised & Addl Training Will Be Provided on Operation of Auto SI Block (← links)
- 05000454/LER-1991-004-11, :on 911016,inadvertent Safety Injection (SI) Occurred While Resetting Status Light for Auto SI Blocked Following ESFAS Surveillance.Caused by Personnel Error. Signal Reset & Equipment Restored (← links)
- 05000454/LER-1991-003-09, :on 910729,identified Errors in Scaling Which Could Prevent Over Temp Delta Temp (OTDT) from Initiating Reactor Trip.Caused by Deficiency in Design That Indicated How OTDT Setpoint Was to Be Scaled (← links)
- 05000454/LER-1994-009, :on 940908,Unit Unexpectedly Tripped Twice. Cause of First Trip Never Determined.Cause of Second Trip Attributed to Personnel Error.Extensive Trouble Shooting & Implemented Software Change (← links)
- 05000454/LER-1994-015, :on 941014,senior Licensed Operator Momentarily Left CR Due to Becoming Distracted.Importance of SRO Duties in CR Communicated to Licensed Operating Personnel Via Daily Orders Placed on 941019 & 1210 (← links)
- 05000454/LER-1994-016, Cancelled (← links)
- 05000454/LER-1994-017, Cancelled (← links)
- 05000454/LER-1994-001-13, :on 941014,senior Licensed Operator Absent from CR Due to Shift Supervisor Getting Distracted.Identification Badge Being Worn by CR Supervisor to Be Reminded of Role & Responsibilities (← links)
- 05000454/LER-1994-012-05, :on 941006,increased Tube Degradation in Plant, Unit 1 Sg.Caused by Axial Oriented ODSCC Located at Hot Leg Tube Regions Bounded by Tube Support Plates (← links)
- 05000454/LER-1994-003-01, :on 940314,AF Isolation Valve Was Exposed to Potentially Harsh Environ Due to Flood Seal Removal. Verified That AF Tunnel Fso Plates in Place on Both Units & Required That Fso Plates Remained in Place (← links)
- 05000454/LER-1994-013-03, :on 941007,SX Basin Level Switch Breaker Left in Wrong Position After Maint.Caused by Failure of Electrical Maint Dept to Return Equipment to Operating Dept. SX Basin Level Switch Reenergized (← links)
- 05000454/LER-1994-014-04, :on 940915,declared DG Inoperable in Mode 5 Due to Misinterpretation of TS Requirements.Revised Procedures & Electronic Work Control Sys (← links)
- 05000454/LER-1994-019-02, :on 941215,missed TS Surveillance Due to Operator Not Recording Info.Ro Involved Counselled to Maintain Proper Documentation of Surveillance Requirements (← links)
- 05000454/LER-1994-018-02, :on 941208,operation of Safety Injection Pump in Mode 4 W/O Two Modes of Isolation from RCS Due to Personnel Error.Counseled Individuals Involved & Enhanced Procedure BOP SI-5 (← links)
- 05000454/LER-1991-002-11, :on 910505,voltage Transient Occurred When Lines Momentarily Opened During Thunderstorm.Caused by Lightning from Storm.Undervoltage Setpoint for Radiation Monitors Previously Lowered (← links)
- 05000454/LER-1994-011, Informs That LER Number 94-011 from Plant Will Not Be Used (← links)
- 05000454/LER-1994-010, Informs That LER Number 94-010 from Plant Will Not Be Used (← links)
- 05000454/LER-1994-009-07, :on 940908,reactor Trips Occurred During Planned Shutdown Due to Solid State Protection Sys Failure. Caused by Personnel Error.Event Placed in Required Reading for Sys Engineering Dept (← links)
- 05000454/LER-1992-004-01, :on 920701,station Received Operability assessment,ENC-QE-40.1,regarding Bdps Due to Inadequate Safety Analysis & Subsequent Review for Bdps.Special Operating Order Was Revised (← links)
- 05000454/LER-1994-008-06, :on 940803,discovered That Since 940304,CS Valves Not Stroke Time Tested in Closed Direction Due to Misinterpretation of TS Requirements.Ist Review That Added Valves Verified as Complete (← links)
- 05000454/LER-1994-007-06, :on 940801,during Rcfr Monthly Surveillance 1B Wide Range Hot Leg RTD Spiked Low.Caused by Splice at RTD Pigtail & Field Cable.Butt Splice Will Be Installed During Next Refueling Outage (← links)
- 05000454/LER-1994-006-04, :on 940715,fuel Assembly Located in Wrong Region of Spent Fuel Pool Due to Personnel Error.Nuclear Matl Custodian & Individual That Performed Independent Verification Counseled (← links)
- 05000454/LER-1991-001-10, :on 910312 & 13,voltage Transient Occurred When 345-kV Line 0624 Tripped Open,Causing Monitors to Go Into Interlock Mode & Resulting in Engineered Safeguards Actuations.Caused by Faults on Lines (← links)
- 05000454/LER-1994-004-09, :on 940423,discovered That Oc Waste Gas Decay Had Not Been Sampled After Radioactive Matls Added.Caused by Poor Work Practices & Inadequate Training.Corrective Action:Personnel Retrained (← links)
- 05000454/LER-1990-013-03, :on 901031,loss of Oa & Ob Essential Svc Water Makeup Pumps Occurred Due to Personnel Error (← links)
- 05000454/LER-1990-010, :on 900818,1A Auxiliary Feedwater Pump Auto Start Due to Module Failure (← links)
- 05000454/LER-1994-003-06, :on 940314,AFW Isolation Valve Exposure to Potentially Harsh Environ Occurred Due to Flood Seal Removal.Afw Tunnel Fso Plates Verified in Place (← links)
- 05000454/LER-1994-002-09, :on 940309,main Steam Safety Valves Setpoints Found Out of Tolerance Due to Calculation Error.Amend to TSs to Allow Tolerance of +3% Requested.Valve Setpoints Will Be Retested by 940509 (← links)
- 05000454/LER-1990-012-02, :on 900906,determined That Auxiliary Feedwater Discharge Isolation Valves Could Not Be Relied Upon.Caused by Inadequate Emergency Procedures.Revs to Emergency Procedures in Progress (← links)
- 05000454/LER-1994-001-05, :on 940201,discovered Several Valves May Not Stroke Under High Differential Pressure Conditions Due to Inadequate Torque Switch Setting.Caution Cards Placed on Effected Valves (← links)
- 05000454/LER-1990-010-05, :on 900818,1A Auxiliary Feedwater Pump Automatic Start Occurred Due to Module Failure.Caused by Relay K1AA Energizing W/O Necessary 3 of 4 Low Steam Generator Signals.Driver Module Panel Replaced (← links)
- 05000454/LER-1990-011-04, :on 900819,high Negative Flux Rate Reactor Trip Occurred Due to Loss of CRD Power Supplies During Lightning Strike.Ground Cables & Lightning Rods Verified Intact (← links)
- 05000454/LER-1993-004-10, :on 931208,notified of Potential Inoperability of AFW Switchover Due to Inadequate Design Change.Temporary Alteration Installed to Move Feeds for 4 Seconds SW Switchover Time Delay Relay (← links)
- 05000454/LER-1990-007-06, :on 900612,discovered That Steam Line Isolation Handswitch on Main Control Board Panel 1PM06J Not Tested During Past Refueling Outages.Caused by Deficient Procedure. All Similar Equipment Will Be Reviewed (← links)
- 05000454/LER-1989-005-01, :on 890501,diesel Generator 1A Failed to Load to 5,500 Kw within 60 as Required.Caused by Max Fuel Setting on Fuel Control Sys Being Set Too Low.Vendor Instructions Added to Maint Procedures (← links)
- 05000454/LER-1990-006-05, :on 900503,as Surveillance Underway All Indication on Digital electro-hydraulic Computer Panel Was Lost.Caused by Failure of Ampere Fuse Due to Short Circuit in Pushbutton.Lighting Circuit Rewired (← links)
- 05000454/LER-1990-003-07, :on 900307,individual Cell Voltage for Cell 53 Found to Be at 2.11 Volts,Contrary to Tech Spec Limit.Caused by Electrician Using Improper Acceptance Criteria Format & Inadequate Mgt Review of Surveillance (← links)
- 05000454/LER-1993-003-06, :on 930306,experienced Difficulty Latching Rcca at Core Location.Caused by Upper Internals Package Fuel Assembly Guide Pins Not Properly Engaged in Top Nozzle. Changes Evaluated Re Top Nozzle Clearance (← links)
- 05000454/LER-1993-002-07, :on 930226,train B Valves Failed to Actuate When Train B Portion of Surveillance Performed.Caused by Jumper Dislodged by Unknown Individual After Surveillance Completed on 930220.New Jumpers Mfg (← links)
- 05000454/LER-1993-001-06, :on 930201,discovered Concern Re Potential Nonconservatism in Determining LTOP Sys Setpoints Used in TS & in Implementing Use of 10CFR50,App G Limits.Appropriate Procedures Will Be Revised (← links)
- 05000454/LER-1990-005-04, :on 900327,high Radiation Signal Caused Fuel Handling Bldg Charcoal Booster Fan to Start & Dampers Transferred to ESF Positions.Caused by Procedural Deficiency.Maint Procedures Revised (← links)
- 05000454/LER-1990-002-09, :on 900301,reactor Trip Occurred.Caused by Failure of Resistance Temp Detector Card Coincident W/One Channel in Test.Failed Card Replaced.Reactivity Computer Reconnected to Power Range Channel (← links)
- 05000454/LER-1990-011-01, :on 900819,reactor Trip Occurred Due to Power Surge.Caused by Lightning Strike.Rod Drive Sys Will Be Modified W/New Model of Power Supply Less Likely to Cause Reactor Trip (← links)
- 05000454/LER-1990-007-01, :on 900612,main Steam Line Isolation Sys Declared Inoperable Due to Failure to Test Manual Initiation Handswitch.Caused by Deficiency in Procedure.Procedures Reviewed (← links)
- 05000454/LER-1990-001-07, :on 900118,determined That Containment Purge Isolation Sys Not Demonstrated Operable 100 H Prior to Start of Core Alterations.Caused by Cognitive Personnel Error. Task Force Formed to Review Tech Specs (← links)
- 05000454/LER-1987-004-02, :on 870225,inadvertent Safety Injection Occurred During Maint Troubleshooting.Caused by Cognitive Personnel Error by Control Sys Technician Involved. Disciplinary Action Taken & Counseling Done (← links)
- 05000454/LER-1989-008, :on 890830,one Auxiliary Feedwater Suction Pressure Transmitter Calibr Not Head Corrected & Bases of Original Setpoints Not Questioned.Caused by Inadequate Procedures & Setpoint Calculations (← links)
- 05000454/LER-1989-009-07, :on 891005,conflicting Info Re Signals That Initiate Automatic Isolation of Steam Generator Blowdown Lines Found.Caused by Preservice Design Implementation Deficiency.Lines Isolated & Procedure Changed (← links)
- 05000454/LER-2017-001, Regarding Volumetric and Surface Examinations of Reactor Pressure Vessel Head Penetration Nozzles Identify Indications Attributed to Primary Water Stress Corrosion Cracking and Minor Subsurface Void Enlargement from (← links)
- 05000454/LER-2016-002, Regarding Inadequate Protection from Tornado Missiles Identified Due to Non-Conforming Design Conditions (← links)
- 05000454/LER-2016-001, Regarding Auxiliary Feedwater Diesel Intake Design Deficiency Related to Turbine Building High Energy Line Break Resulted in an Unanalyzed Condition Due to Insufficient Validation of Vendor Analysis Inputs (← links)
- 05000454/LER-2015-006, Regarding Mode 3 Entered with Turbine Trip Safety Function Disabled Due to Safety Related Relay Leads Lifted (← links)
- 05000454/LER-2015-005, Regarding Liquid Penetrant Indications in Embedded Flaw Seal Weld Repair of Control Rod Drive Mechanism Penetration 31 During Refueling Outage (← links)
- 05000454/LER-2015-004, Regarding Unanalyzed Condition Due to a Design Deficiency with Pressurizer Power Operated Relief Valve Circuitry That Could Prevent Valve Manual Closure to Mitigate Spurious Operation (← links)
- 05000454/LER-2015-003, Re One Train of Diesel Generator System Inoperable Longer than Allowed by Technical Specifications Due to Loss of Diesel Fuel Oil System Volume (← links)
- 05000454/LER-2015-002, Re Reactor Trip Resulting from a Phase to Phase Fault on the 1E Main Power Transformer (← links)
- 05000454/LER-2015-001, Inadequate Application of Technical Specifications Related to Main Steam Isolation Valves and Actuator Trains (← links)
- 05000454/LER-2014-003, Regarding Diesel Generator Actuation Due to System Auxiliary Transformer 142-2 Relay Actuation and Loss of Off-site Power (LOOP) (← links)
- 05000454/LER-2014-002, Non-Compliance with Technical Specification 3.4.3 - RCS Pressure and Temperature (P/T) Limits (← links)
- 05000454/LER-2014-001, Regarding Oa Essential Service Water (SX) Makeup Pump Unexpected Auto Start During Ob SX Pump Monthly Surveillance (← links)
- 05000454/LER-2013-001, Regarding Failed Surveillance Test of a Train Control Room Emergency Filtration System (← links)
- 05000454/LER-2012-004, Reactor Pressure Vessel Head Control Rod Drive Mechanism Penetration Nozzle Weld Repair Surface Indications (← links)
- 05000454/LER-2012-003, Regarding Containment Area Radiation Monitors Inoperable for Longer than Allowed by Technical Specifications Due to Inadequate Procedure Controls (← links)
- 05000454/LER-2012-002, Regarding One Train of Containment Cooling System Inoperable Longer than Allowed by Technical Specifications Due to Inadequate Work Instructions (← links)
- 05000454/LER-2012-001, Regarding Unit 2 Loss of Normal Offsite Power and Reactor Trip and Unit 1 Loss of Normal Offsite Power Due to Failure of System Auxiliary Transformer Inverted Insulators (← links)
- 05000454/LER-2011-003, Regarding Drained Sections of Piping in Auxiliary Feedwater Suction Lines Result on System Lnoperability Due to Inadequate Technical Evaluation (← links)
- 05000454/LER-2011-002, Re Reactor Pressure Vessel Head Penetration Nozzle Weld Flaws Attributed to Primary Water Stress Corrosion Cracking (← links)
- 05000454/LER-2011-001, For Byron Station Unit 1, Regarding Potential Loss of Residual Heat Removal System Safety Function in Mode 4 When Aligned for Shutdown Cooling Due to Potential for Flashing or Voiding Coolant During a Shutdown Loss of Coolant A (← links)
- 05000454/LER-2010-001, Regarding Technical Specifications Allowed Outage Time Extension Request for Component Cooling System Contained Inaccurate Design Information That Significantly Impacted the Technical Justification (← links)
- 05000454/LER-2009-002, Unit 1 Regarding Inadvertent Contact with Handswitch Results in an Automatic Reactor Trip of Unit 1 (← links)
- 05000454/LER-2009-001, Drain Procedure for ECCS Suction Line Creates an Unanalyzed Condition Due to Inadequate Configuration Requirements (← links)
- 05000454/LER-2008-002, For Byron, Unit 1, Regarding Technical Specification Non-Compliance Due to Inadequate Design of Auxiliary Feedwater (AF) Tunnel Access Covers Causing AF Valves within the Tunnel to Be Inoperable (← links)
- 05000454/LER-2008-001, Technical Specification Noncompliance of Containment Sump Monitor Due to Improper Installation During Original Construction (← links)
- 05000454/LER-2007-003, Regarding Technical Specifications Non-Compliance on a Single Reactor Trip Instrument Channel Due to an Instrument Maintenance Procedure Revision Error (← links)
- 05000454/LER-2007-002, Technical Specification Required Shutdown of Unit 1 and Unit 2 Due to an Ultimate Heat Sink Pipe Leak Common to Both Units (← links)
- 05000454/LER-2006-003, Regarding Inadvertent Exceeding of Technical Specification Action Requirement Completion Time for Containment Spray Additive System Due to Not Recognizing an Inoperable Condition (← links)
- 05000454/LER-2006-002, Regarding All Refueling Water Storage Tank Level Instrumentation Channels Made Inoperable During a Single Channel Calibration Activity Due to a Design Flaw (← links)
- 05000454/LER-2006-001, Technical Specification Required Action Completion Time Exceeded for Inoperable Containment Isolation Valves Due to Untimely Operability Determination (← links)
- 05000454/LER-2005-005, Re Both Trains of the Ultimate Heat Sink Water Makeup Trains Exceeded Technical Specifications Required Action Completion Time Due to Contaminated Fuel Oil Resulting from Inadequate Tank Cleaning Procedure (← links)
- 05000454/LER-2004-001, Re Reactor Containment Fan Coolers Flow Rates Below Technical Specification Requirements Due to Inaccurate Flow Indication (← links)
- 05000454/LER-2005-004, Regarding Technical Specification Required Action Not Satisfied Due to Ambiguous Implementing Procedure (← links)
- 05000454/LER-2005-003, Regarding Technical Specification (TS) 3.9.4 Violation Due to Imprecise Original TS and TS Bases Wording (← links)
- 05000454/LER-2005-002, Regarding One of Two Trains of Hydrogen Recombiner Inoperable Longer than Allowed by Technical Specifications Due to Inadequate Procedure (← links)
- 05000454/LER-2005-001, Regarding Failed Technical Specification Ventilation Surveillance Requirements During Surveillance Requirement 3.0.3 Delay Period (← links)
- 05000454/LER-2003-004, Regarding Two Main Steam Safety Valves Lift Setpoints Were Found Out of Tolerance During Testing Due to Unknown Causes (← links)
- 05000454/LER-2003-003, Regarding Licensed Maximum Power Level Exceeded Due to Inaccuracies in Feedwater Ultrasonic Flow Measurements Caused by Signal Noise Contamination (← links)
- 05000454/LER-2003-001, Regarding Control Room Ventilation System Alignment Results in Inoperable Radiation Monitors Without Taking Required Actions Put Technical Specifications (← links)
- 05000454/LER-2003-002, Two Main Steam Safety Valves Lift Setpoints Found Out of Tolerance During Testing Due to Unknown Causes (← links)
- 05000454/LER-2002-003, Two Automatic Reactor Trips Due to Reactor Coolant Overtemperature Conditions Caused by Digital Electrohydraulic Control System Circuit Card Failure Causing the Turbine Governor Valves to Close (← links)
- 05000454/LER-2002-001-01, For Byron Unit 1 Multiple Main Steam Safety Valve Relief Tests Exceeded Required Tolerance Due to Disk to Nozzle Metallic Bonding and Setpoint Drift (← links)
- 05000454/LER-2002-002, Re Two or Three Pressurizer Safety Valve Relief Tests Exceeded Required Tolerance Due to Setpoint Drift (← links)
- 05000454/LER-2001-003-01, Unit, 1,Entry Into Technical Specification Limiting Condition for Operation 3.0.3 Due to a Leak on a Safety Injection Valve Weld Caused by a Pre-Existing Condition, (Supplement One) (← links)
- IR 05000454/2024004 (← links)
- 05000454/LER-2024-002, Reactor Vessel Closure Head Penetration 31 Degraded (← links)