Pages that link to "05000461/LER-2013-001, Inadequate Risk Identification Results in Loss of Safety Function"

The following pages link to 05000461/LER-2013-001, Inadequate Risk Identification Results in Loss of Safety Function:

Displayed 10 items.

• 05000461/LER-2013-001 (redirect page) ‎ (← links)
  • 05000461/LER-2002-001 ‎ (← links)
  • 05000461/LER-2001-003 ‎ (← links)
  • 05000461/LER-2001-002 ‎ (← links)
  • 05000461/LER-2001-001 ‎ (← links)
  • IR 05000461/2013005 ‎ (← links)
  • IR 05000451/2013005 ‎ (← links)
  • 05000461/LER-2020-001, Submittal of LER 2020-001-00 for Clinton Power Station, Unit 1, Reportable Contraband Event ‎ (← links)
  • 05000461/LER-1992-010, Re-isssed LER 92-010-00:on 921122,turbine Driven RFP B Min Flow Valve Failed Open Due to Broken Instrument Air Supply Line.Copper Tubing Air Supply Line Replaced W/Flexible Stainless Steel Hoses ‎ (← links)
  • 05000461/LER-1988-016, Forwards LER 88-016-00 Re Failure to Recognize Location & Extent of Penetration Seal Repair Results in Violation of Secondary Containment Integrity ‎ (← links)
  • 05000461/LER-1998-012, Forwards LER 98-012-00, High Differential Pressure Required to Close Excess Flow Check Valves Results in Valves Being Outside of Design Basis of Plant, IAW Requirements of 10CFR50.73 ‎ (← links)
  • 05000461/LER-1997-034, Forwards 930414 S&L Electrical Engineering Std ESA-102 W/Copyright Statement Removed.Encl Originally Submitted w/980205 Info Re CPS Combined LER 97-034-00 & Part 21 Rept Contained Copyright Statement ‎ (← links)
  • 05000461/LER-1997-021, Forwards LER 97-021-00 & 10CFR21 Rept 21-97-040,re Control Circuit for Division 1 EDG Feed Breaker Which Did Not Meet Basis Due to Design Error ‎ (← links)
  • 05000461/LER-1998-008, Forwards LER 98-008-00,re Division I Hydrogen & Oxygen Analyzer Incapable of Meeting Design Basis Due to an Excessive Vibration Condition on Air Compressor.Caused by Personnel Error.Commitments Made within Ltr,Listed ‎ (← links)
  • 05000461/LER-1995-007, Responds to Violation Noted in Insp Rept 50-461/95-12.CPS LER 95-007-00 Issued Via Util ,Provides Info Re Subj NOV & Adequately Addresses Requirements Noted in NOV to Provide Reason for Violation & Corrective Actions ‎ (← links)
  • 05000461/LER-2023-002-01, Reactor Core Isolation Cooling Inoperable Prior to Mode Change ‎ (← links)
  • 05000461/LER-2023-002, Reactor Core Isolation Cooling System Inoperable Prior to Mode Change ‎ (← links)
  • 05000461/LER-2021-002-02, Core Alterations with Source Range Monitor Inoperable Results in Condition Prohibited by Technical Specifications ‎ (← links)
  • 05000461/LER-2021-002-01, Core Alterations with Source Range Monitor Inoperable Results in Condition Prohibited by Technical Specifications ‎ (← links)
  • 05000461/LER-2021-002, Core Alteration with Source Range Monitor Inoperable Results in Condition Prohibited by Technical Specifications ‎ (← links)
  • 05000461/LER-2021-001, Core Monitoring System Software Modeling Error Results in Condition Prohibited by Technical Specifications ‎ (← links)
  • 05000461/LER-2020-003, Reactor Core Isolation Cooling System Card Fuse Failure Results in a Condition Prohibited by Technical Specifications and That Could Have Prevented Fulfillment of a Safetv Function Needed to Control ‎ (← links)
  • 05000461/LER-2020-002, Simultaneous Lnoperability of Main Control Room Ventilation Subsystems a and B ‎ (← links)
  • 05000461/LER-1998-016, :on 870630,failure to Test Valves 1SX013D/E/F IAW IST Program Was Noted.Caused by Personnel Error.Tested Safety Functions of Valves 1SX012D/E/F & Added Valves to IST ‎ (← links)
  • 05000461/LER-1998-003-01, Forwards LER 98-003-01 & Part 21 Rept 21-98-022,re Loss of Nuclear Sys Protection Sys Bus.Commitments Made within Ltr, Listed ‎ (← links)
  • 05000461/LER-1998-004, :on 980127,identified Various Deficiencies in Installed SCR & Power Diodes of Division 2 Nsps Inverter. Caused by Ineffective & Inadequate Preventive Maint. Corrected Deficiencies & Calibr Inverter,Per 10CFR21 ‎ (← links)
  • 05000461/LER-1998-004-01, Forwards LER 98-004-01 & 10CFR21 Rept 21-98-004/015, Division 2 Nuclear Systems Protection Sys Inverter Not IAW Plants Design Basis Due to Various Deficiencies. Commitments Made by Util,Listed ‎ (← links)
  • 05000461/LER-1989-012, :on 890301,technicians Grounded & Reinstalled Logic Card After Receiving Unsatisfactory Test Results. Alarms Annunciated as Containment Isolation Valves Isolated.Caused by Inadequate Ground on Card ‎ (← links)
  • 05000461/LER-1989-027, :on 890628,identified That Between 890411 & 0518,plant Operated in Condition Prohibited by Tech Specs. on 890403,screw Securing Control Room HVAC Sys Time Delay Relays Found to Be Missing ‎ (← links)
  • 05000461/LER-1989-021, :on 890521,shift Supervisor Failed to Identify That Sys Isolation Would Remove RWCU Sys Conductivity Monitor from Svc Which Resulted in Missed Sample.Caused by Personnel Error.Supervisor Counseled ‎ (← links)
  • 05000461/LER-1998-018, :on 980416,ESFA,occurred.Caused by Deficiencies in Method Used to Perform Nsps Power Supply Adjustment. Developed Maint Procedure for Replacement of Power Supplies Powered by Nsps Bus ‎ (← links)
  • 05000461/LER-1998-019, :on 980417,noted Failure to Satisfy TS for Ensuring That Electrical Loads Properly Sequence Onto safety-related Buses.Caused by Inadequate Surveillance Procedures.Will Revise Procedures 9080.21 & 9080.22 ‎ (← links)
  • 05000461/LER-1989-026, :on 890621,discovered That Tech Spec Requirements Re Setpoint Verifications for APRM Trip Function Not Fully Met Since Initial Startup.Caused by Deficient Procedure.Mode 1 Checklist Revised ‎ (← links)
  • 05000461/LER-1989-028, :on 890628,trip of Main Generator Resulted in Turbine Trip & Automatic Reactor Scram.Caused by Spurious Signal from Malfunctioning Sudden Pressure Sensor Relay. Relay Replaced W/One That Has Air Vent ‎ (← links)
  • 05000461/LER-1989-011, :on 890226,water Level in Upper Containment Fuel Pools Dropped Below Min Level of 23 Ft Above Top of Reactor Pressure Vessel.Caused by Insufficient Training. Procedure Re Fuel Pool Cooling Revised ‎ (← links)
  • 05000461/LER-1989-013, :on 890302,all intermediate-range Channels Declared Inoperable Because Weekly Channel Functional Surveillance Could Not Be Performed Due to Plant Conditions. Caused by Personnel Error.Personnel Counseled ‎ (← links)
  • 05000461/LER-1998-017, :on 980402,inadequate Implementation of SR Was Noted.Caused by Misinterpretation of TS SR 3.8.6.2 & Table 3.8.6-1.Revised Procedure for Performing Battery Cell Specific Gravity Checks ‎ (← links)
  • 05000461/LER-1998-015, :on 980405,ESF Actuation Was Noted.Caused by Shorted Diode in Nsps.Replaced Shorted Blocking Diode & Tested Other Diodes for Defects ‎ (← links)
  • 05000461/LER-1989-025, :on 890622,determined That Channel Functional Test of Instrumentation Which Provides Rod Pattern Control Sys High Power Setpoint Trip Function Not Performed.Caused by Inadequate Corrective Action ‎ (← links)
  • 05000461/LER-1989-024, :on 890619,west RWCU HX Room Temp Module Failed Channel Checks.Investigation Into Failures Revealed That Modules Miscalibrated on 890616.Caused by Personnel Error. Technicians Briefed on Use of Manuals ‎ (← links)
  • 05000461/LER-1989-033, :on 890807,main Steam Line flow-high Signal Initiated Causing Isolation of Containment Isolation Valves. Caused by Failure to Recognize Extended Mode 3 Operation Problems.Procedure 3101.01 Revised ‎ (← links)
  • 05000461/LER-1989-032, :on 890731,operators Initiated Manual Scram Due to Difficulties W/Moisture Separator Reheater & High Pressure Feedwater Heater Sys.Caused by Personnel Error. Operators Provided W/Details of Event ‎ (← links)
  • 05000461/LER-1989-020, :on 890415,determined That Polarity of Test Equipment Connections to Digital Signal Conditioner Pins Reversed.Caused by Failure to Investigate Consequences of Shorting Pins.Supervisor Counseled ‎ (← links)
  • 05000461/LER-1989-018, :on 890414,high Neutron Flux Signal Occurred on intermediate-range Monitor C & intermediate-range Monitor D Tripped.Caused by Recessed Connector Pin for Monitor C Signal Lead.Pin Repaired & Operators Briefed ‎ (← links)
  • 05000461/LER-1989-031, :on 890724,plant Entered Mode 2 Startup W/O Meeting Provisions of Tech Spec 3.0.4.Caused by Personnel Lack of Understanding of Tech Specs & Failure to Recognize Temp Recorder.Training on Tech Specs Increased ‎ (← links)
  • 05000461/LER-1989-022, :on 890526,insertion of Manual Scram Signal Caused Reactor Water Level to Drop.On 890601,valve 1FW004 Failed to Shut in Response to Control Signal.First Event Caused by Faulty servo-amplifier Board ‎ (← links)
  • 05000461/LER-1989-030, :on 890715,scram Signal Initiated When RHR Shutdown Cooling Valves Opened,Decreasing Reactor Water Level.Caused by Failure to Repair Seat Leakage Promptly. Maint Work Request to Repair Valve Performed ‎ (← links)
  • 05000461/LER-1989-023, :on 890531,determined That Secondary Containment Integrity Requirements of Tech Spec 3.6.6.1 Not Met Based on Discovery,On 890410,that Air Blowing from Weep Holes of Pull Boxes.Caused by Contractor Error ‎ (← links)
  • 05000461/LER-1989-029, :on 890714,manual Scram Initiated in Anticipation of Automatic Scram Due to Decrease in Main Condenser Vacuum.Caused by Mechanical Failure in Rubber Expansion Joint.Joint Replaced ‎ (← links)
  • 05000461/LER-1989-017, :on 890301,discovered That Mounting Hardware for Shutdown Svc Water Sys Diesel Generator HX Not Installed as Designed.Caused by Const/Installation Error.Mounting Hardware Reworked & Adequacy for HXs Verified ‎ (← links)
  • 05000461/LER-1989-016, :on 890319,reactor Mode Switch Placed in Shutoff Position,Causing Scram Inlet & Outlet Valves to Open Resulting in Misdirecting of CRD Bypass Flow.Caused by Inadequate Procedures.Procedure Revised ‎ (← links)
  • 05000461/LER-1989-019, :on 890414,electrical Equipment Failed to Meet Environ Qualification Requirements Due to Various Causes Resulting in Technically Inoperable Equipment.Environ Zone Maps Corrected as Part of Next Update to SAR ‎ (← links)
  • 05000461/LER-1989-015, :on 890311,surveillance Review Group Noted That Section 8.4 Not Been Performed within Max Time Interval Permitted by Tech Spec 4.0.2.Caused by Personnel Error. Individual Counseled on Failure to Use Ref ‎ (← links)
  • 05000461/LER-1989-014, :on 890304,failure to Accurately Assess Impact That Existing Sys Lineup Had on Local Leak Rate Test Lineup Occurred,Violating Secondary Containment Integrity.Caused by Shift Supervisor Error.Supervisor Counseled ‎ (← links)
  • 05000461/LER-1998-025, :on 860929,repeated Failures of Switchgear Heat Removal Condenser Gasket Occurred.Caused by Inadequate Design Consideration of Pressure Transient Effects of Shutdown SWS Components.Installed blow-out Resistant Gasket ‎ (← links)
  • 05000461/LER-1998-022, :on 980729,discovered That Surveillance Testing of Div 2 DG Fuel Oil Transfer Pump & Div 2 DG Fuel Oil Storage Tank Had Not Been Performed.Caused by Data Input Error.Will Update & Verify Completion Dates in Database ‎ (← links)
  • 05000461/LER-1987-049, :on 870819,two Channel Tests Not Performed within 24 H Time Interval.Caused by Util Licensed Operator Error Due to Confusion During Shift Transition.Control Room Operator Surveillance Log Data Sheet Revised ‎ (← links)
  • 05000461/LER-1987-047, :on 870814,inservice Insp Surveillance Not Performed as Required by Tech Spec 4.0.5.Caused by Personnel Error.Rhr Pump Room Cooling Coil Shutdown Svc Water Outlet Valves Tested & Procedure Revised Temporarily ‎ (← links)
  • 05000461/LER-1987-048, :on 870817,limiting Condition for Operation Entered When Main Condenser Offgas Treatment Sys Hydrogen Monitors Declared Inoperable.Caused by Personnel Error. Revised Scheduling Directive Issued ‎ (← links)
  • 05000461/LER-1987-042, :on 870812,reactor Scrammed on High Flux on APRM Channels B & D.Caused by Personnel Failure to Follow Procedures.Training Provided for Control & Instrumentation & Startup Personnel ‎ (← links)
  • 05000461/LER-1987-045, :on 870729,automatic Actuation of Main Control Room Ventilation Sys Into High Radiation Mode Occurred. Caused by Detector Circuit Card Failure.Circuit Board Replaced & Monitor Declared Operable ‎ (← links)
  • 05000461/LER-1987-044, :on 870730,violation of Plant Tech Spec 4.3.1.1,Table 4.3.1.1-1,Item 2a Occurred.Caused by Personnel Error Resulting from Procedural Deficiency.Procedure Revised to Ensure Thorough Channel Check ‎ (← links)
  • 05000461/LER-1987-035, :on 870722,discovered That Land Use Census Performed in Jul 1986 Did Not Meet Requirements of Tech Spec 3.12.2.Caused by Personnel Error.Land Use Census Performed Successfully & Surveillance Procedure Revised ‎ (← links)
  • 05000461/LER-1987-043, :on 870724,reactor Scram Occurred as Result of Turbine Control Valve Fast Closure.Caused by Loose Connectors in Turbine Trip Vibration Detection Circuitry. Connectors Corrected Under GE Supervision ‎ (← links)
  • 05000461/LER-1987-046, :on 870729,identified That Rev to Procedure 9920.77 Deleted Radwaste Isolation Valve 1WE036 Trip Testing for Several Modes of Radwaste Monitor ORIX-PR040.Caused by Personnel Error.Procedure Revised ‎ (← links)
  • 05000461/LER-1987-036, :on 870713,automatic Reactor Scram Occurred Due to High Flux Ramping from 19% to 31% Open in Approx 1 S. Caused by Equipment/Component Malfunction.Personnel Implemented Scram Procedure ‎ (← links)
  • 05000461/LER-1987-037, :on 870713 & 23,two once-per-shift Tech Spec Section 4.3.2.1 Surveillances Not Performed.Both Events Caused by Personnel Error.All Shift Supervisors & Shift Personnel Trained on Procedure Adherence ‎ (← links)
  • 05000461/LER-1987-039, :on 870715,review Determined That Control & Power Circuit for Valve Not Worked Under Maint Work Request C52962.Caused by Personnel Error.Valve 1VR001B Declared Inoperable ‎ (← links)
  • 05000461/LER-1987-067, :on 871124,Div 1 RCIC Isolated.Caused by Overly Restrictive Design Setpoint Trip Tolerance for Riley 86 Temp Switches Which Resulted in Broken Lead Wire.Broken Wire Reworked ‎ (← links)
  • 05000461/LER-1998-021, :on 980220,cracks in Medium & High Density Silicone Penetration Seals Were Not Per Design Basis.Caused by Design Error.Inspected Potentially Affected Seals & Repaired Seals as Necessary ‎ (← links)
  • 05000461/LER-1987-063, :on 871122,instrument Root Valve for Div 1 Reactor Vessel Pressure Transmitter Discovered Closed.Caused by Failure of Control & Instrumentation Technicians to Follow Procedures.Technicians Retrained ‎ (← links)
  • 05000461/LER-1998-024, :on 980708,failure to Perform Surveillance Testing on Div II Voltage Relays within Specified Frequency of TS Was Noted.Cause of Event Is Under Investigation.Util Expects to Issue Rev to Rept by 980907 ‎ (← links)
  • 05000461/LER-1987-065, :on 871104,reactor Tripped Due to Decay of Containment Air Header Pressure During Div 2 Surveillance. Caused by Inadequate Surveillance Procedure & Operator Error.Rev Planned ‎ (← links)
  • 05000461/LER-1987-066, :on 871105,156 Junction Boxes Identified That Failed to Meet Environ Qualifications.Caused by Const Contractor Failure to Install Drainage Openings.Drainage Openings Added to Junction Boxes ‎ (← links)
  • 05000461/LER-1998-023, :on 980626,determined That TS SR 3.8.1.17 for Division 3 DG Which Verifies ready-to-load Following Receipt of ECCS Signal,Was Not Adequately Satisfied.Cause & Corrective Actions Will Be Provided in Revised LER ‎ (← links)
  • 05000461/LER-1987-062, :on 871026,local Leak Rate Testing Identified That Primary Containment Leakage Rates of MSIVs on Lines a, B & C Exceeded Tech Spec Limits.Caused by Anomalies in Seating Surfaces of Inboard & Outboard Valves ‎ (← links)
  • 05000461/LER-1987-064, :on 871102,Div 3 Diesel Generator Automatically Started While Technician Disconnected Undervoltage Relay. Caused by Inadequate Procedure & Personnel Error.Procedure Revised & Technicians Trained ‎ (← links)
  • 05000461/LER-1987-040, :on 870710,util Radiation Protection Personnel Discovered That Collection Media Missing from Particulate/ Iodine Sampler.Caused by Failure to Reinstall Media on 870703.Collection Media Reinstalled ‎ (← links)
  • 05000461/LER-1998-020, :on 980609,discovered Flow Gauge in Main CR to Be Reading Greater than Instrument Range.Cause Indeterminate.Will Incorporate Event Info Into Operator Training Program & Verified Calibr of Flow Instrumentation ‎ (← links)
  • 05000461/LER-1987-061, :on 871014,review of Procedure Identified That Channel Check of Containment Pressure High Trip Function for Containment Spray Missed.Caused by Licensed Operator Error. Personnel Will Be Trained Re Procedures ‎ (← links)
  • 05000461/LER-1987-034, :on 870707,process Radiation Monitor Declared Inoperable Due to Failed Channel Functional Test Not Placed in Tripped Condition within 1 H.Caused by Personnel Error. Personnel Counseled Re Communications ‎ (← links)
  • 05000461/LER-1996-015-02, Forwards LER 96-015-02 Re Lack of Attention to Detail During Procedure Performance.Ler Has Been Revised to Remove Contributing Cause of Event & Corrective Action Associated W/Contributing Cause ‎ (← links)
  • 05000461/LER-1987-059, :on 871002,RCIC Steam Supply Inboard Containment Isolation Valve Actuated.Caused by Technician Not Verifying Jumper Connector Configuration After Installation of Cable.Technician Counseled ‎ (← links)
  • 05000461/LER-1988-025, :on 880728,plant Experienced Partial Loss of Feedwater Heating.Caused by Inappropriate Setting of Feedwater Heating Sys Level Controllers.Procedure 4005.01 Revised.Also Reportable Per Part 21 ‎ (← links)
  • 05000461/LER-1987-060, :on 871002,automatic Reactor Trip Occurred Due to Misoperation of non-class 1E 125 Volts Dc Breaker.Caused by Nonlicensed Operator.Nonlicensed Operator Counseled.One Line Diagram Relabeled ‎ (← links)
  • 05000461/LER-1987-041, :on 870701,containment Penetrations Leak Tested W/Air Instead of Water Per Tech Spec 3.6.1.2(e).Caused by Util Personnel Error.Surveillance Procedure Changed Under Temporary Change Program ‎ (← links)
  • 05000461/LER-1989-010, :on 890206,train B of Standby Gas Treatment Sys Automatically Actuated While Power Restored to Div I,Class IE Ac Power Sys.Caused by Use of Incorrect Sequence for Power Restoration Leads.Work Plans Reviewed ‎ (← links)
  • 05000461/LER-1987-058, :on 870930,failure to Perform Leak Test of Primary Containment Air Lock Door Seal Identified.Caused by Personnel Error Due to Misinterpretation of Tech Specs.Leak Test Completed & Containment Verified ‎ (← links)
  • 05000461/LER-1987-057, :on 870929,discovered That 8-h Verification of Offsite Power Breaker Lineups During Diesel Generator Inoperability Missed.Caused by Line Assistant Shift Supervisor Oversight.Supervisor Counseled ‎ (← links)
  • 05000461/LER-1987-038, :on 870714,during CPS Surveillance Procedure 9070.1,control Room Ventilation Makeup Fan B Produced Less than Required Flow Rate.Caused by Maint Work Request & Personnel error.Safety-related Fans Evaluated ‎ (← links)
  • 05000461/LER-1989-008, :on 890203,during Restoration from Surveillance Test,Containment Isolation Valves 1IA006 & 07 Shut & Containment Isolation Logic Not Reset Prior to Relanding Lead.Caused by Personnel Error ‎ (← links)
  • 05000461/LER-1989-009, :on 890203,high Drywell Pressure Signal Simulated Causing RHR Upper Containment B Fuel Pool Cooling Shutoff Valve to Unexpectedly Shut.Caused by Deficient Surveillance Procedure.Procedures Reviewed ‎ (← links)
  • 05000461/LER-1987-055, :on 870921,reactor Protection Sys (RPS) Automatically Actuated.Caused by Faulty Reactor Feed Pump B Net Positive Suction Head Function Generator Card.Card Replaced & Calibr ‎ (← links)
  • 05000461/LER-1987-054, :on 870916,review Identified That Particulate Filter & Iodine Cartridge for HVAC Stack Process Radiation monitor,ORIX-PR002,not Changed Out within Required 7-day Period.Caused by Personnel Error ‎ (← links)
  • 05000461/LER-1987-056, :on 870923,operators Identified That Tech Spec Violated When Grab Samples Not Collected at Least Every 4 H. Caused by Util Licensed Operator Error.Shift Supervisor Counseled ‎ (← links)
  • 05000461/LER-1987-031, :on 870617,RWCU Sys Pumps Tripped & in-board Containment Isolation Valves Shut.On 870705,spurious Signal Received Isolating RWCU Sys.Caused by Failed Differential Temp Point Module.Module Replaced ‎ (← links)
  • 05000461/LER-1987-053, :on 870912,discovered Thermal Overload Protection for Fire Protection Sys Containment Isolation Valves Not in Bypass Status.Caused by Operator Error. Operator Counseled & Procedure to Be Revised ‎ (← links)
  • 05000461/LER-1989-007, :on 890122,incorrect Operability Determination Due to Insufficient Review of Source Range Monitor Status Results in Core Alterations W/O Required Two Operable Source Range Monitors.Shift Supervisor Counselled ‎ (← links)
  • 05000461/LER-1987-032, :on 870604,operations Dept Determined That Stroke Time Test Surveillance Required by Tech Spec 4.6.4.1 Not Performed for Containment Isolation Valve.Caused by Operations Personnel Error.Valve Deactivated ‎ (← links)
  • 05000461/LER-1987-033, :on 870607,high Pressure Turbine First Stage Pressure Sensing Instruments Inoperable.Caused by Personnel Error.Limiting Condition for Operations Entered for Affected Instruments & Valve Lineups Performed ‎ (← links)
  • 05000461/LER-1987-052, :on 870902,RCIC Steam Inboard Isolation Valve Automatically Isolated.Caused by Personnel Error.Technicians & Operations Supervisors Instructed.Procedure Prepared Addressing Action Plans for Troubleshooting ‎ (← links)
  • 05000461/LER-1989-006, :on 890116,three Penetration Conduits in Secondary Containment Gas Boundary Lacked Internal Ventilation Seals.Caused by Misinterpreting Design Specs. Seals Installed in Unsealed Conduits ‎ (← links)
  • 05000461/LER-1987-050, :on 870825,turbine Generator Tripped on Low Condenser Vacuum Resulting in Reactor Scram.Caused by Nonlicensed Operator Error Resulting from Deficient Valve Lineup Procedure.Procedure Revised ‎ (← links)
  • 05000461/LER-1987-051, :on 870828,rod Pattern Control Sys,Rod Withdrawal Limiter High Power Setpoint Channel Functional Test Not Performed within 1 Hr Prior to Control Rod Movement in Mode 1.Caused by Personnel Error ‎ (← links)
  • 05000461/LER-1987-069, :on 871203,isolation Instrumentation Declared Inoperable Due to Inoperable Containment Isolation Function Valve.Caused by Operator Oversight.Staff Assistant Shift Supervisor Counseled for Oversight ‎ (← links)
  • 05000461/LER-1997-034-01, Forwards LER 97-034-01 & Part 21 Rept 21-97-051 Re Incorrect Cable Resistance & Brake Horsepower Data Used in Design of Divisions 1 & 2 EDG Vent Fans Which Resulted in Design of Fan Monitors Being Outside Design Basis of Pla ‎ (← links)
  • 05000461/LER-1998-005-01, Forwards LER 98-005-01 Re Failure to Verify Closed Pcivs,Per TS Sr.Commitments Made in Rept,Listed ‎ (← links)
  • 05000461/LER-1998-007, :on 980322,inadequate Engineering Evaluation Leads to Installation of Temporary Mod on DC Electrical Power Sys,Was Determined.Caused by Misjudgement & Misassumptions.Improvements Made to 10CFR50.59 SE Process ‎ (← links)
  • 05000461/LER-1998-014, :on 980325,design Fatigue Analysis for FW Piping Does Not Match Fatigue Analysis for FW Nozzles, Resulting in Condition,Outside Design Basis of Plant Occurred.Cause & Corrective Action,Not Yet Been Determined ‎ (← links)
  • 05000461/LER-1999-010-01, Inoperability of Div 2 EDG Caused by Fuel Leaking Into Lube Oil, Cancelled ‎ (← links)
  • 05000461/LER-1997-035-01, Forwards LER 97-035-01,re Divisions 1 & 2 Battery Chargers Incapable of Supplying Full Rated Voltage & Current Flow at Degraded Voltage Trip Setpoint IAW Plant TS & Design Basis.Commitments Made within Ltr,Listed ‎ (← links)
  • 05000461/LER-1987-030, :on 870605,RWCU Sys Automatically Isolated. Caused by Feedwater Flow/Pressure Sensitivity to Flow/ Pressure Perturbations.Sys Remained Isolated Until Feedwater Flow Manipulations Complete & Flow Stabilized ‎ (← links)
  • 05000461/LER-1998-010, :on 971217,Divs 1 & 2 H & Oxygen Analyzers Were Declared Inoperable Due to Inadequate Commercial Grade Dedication of safety-related Replacement Parts by Supplier. Evaluated Installed Parts for Acceptability ‎ (← links)
  • 05000461/LER-1998-011, :on 980312,CR Ventilation Sys Was Declared Inoperable Due to Broken/Missing Conduit Hold Down Restraints on VC Chiller Skids.Caused by Personnel Walking on Equipment.Generated Work Requests ‎ (← links)
  • 05000461/LER-1996-010-01, Forwards LER 96-010-01, Plant Shutdown Due to Unidentified RCS Leakage from Degraded Reactor Recirculation Pump Seal Greater than TS Limit. Revised Rept Includes Cause of Event,Corrective Actions & Discussion of Similar Even ‎ (← links)
  • 05000461/LER-1999-010, :on 990809,declared Div 2 EDG Inoperable Due to Fuel Leaking Into Lube Oil.Replaced Fuel Return Line from Engine Number 12 Cylinder on Div 2 Edg.With ‎ (← links)
  • 05000461/LER-1998-008-01, :on 930213,Division I Hydrogen & Oxygen Analyzer Incapable of Meeting Design Basis Were Noted Due to an Excessive Vibration Condition on Air Compressor.Caused by Personnel Error.Div 1 H202 Air Condition Will Be Corrected ‎ (← links)
  • 05000461/LER-1997-002-01, Forwards LER 97-002-01 Re Failure to Complete TS 3.8.2 LCO Required Action B.4 Due to Personnel Error.Commitment Made within Ltr,Listed ‎ (← links)
  • 05000461/LER-1998-009, :on 980203,failure to Account for Design Basis Sys Pressures & Voltages for EDG Air Start Sys Was Noted. Caused by Failure of Design Engineer.Changed Spring Size in Solenoid Valve for Division III EDG Air Start Sys ‎ (← links)
  • 05000461/LER-1997-005-01, Forwards LER 97-005-01 Re Eighteen Containment Penetrations Susceptible to Thermally Induced over-pressurization Due to Unknown Cause.Util Will Modify Seven Containment Penetrations to Eliminate over-pressure Concern ‎ (← links)
  • 05000461/LER-1997-023-01, Inadequate Work Instructions Leads to Potential Over-Greasing of Motor Bearings Causing Potential Failure of Various Motors Has Been Canceled ‎ (← links)
  • 05000461/LER-1986-018, :on 861026,during Mode 5 Surveillance on RCIC, RWCU Outboard Containment Isolation Occurred Due to Loss of Power.Caused by Personnel Error.Test Personnel Instructed. Surveillance Procedure Revised ‎ (← links)
  • 05000461/LER-1986-009, :on 861014,during Automatic Depressurization Sys Surveillance Test,Two Level Transmitters Installed to Simulate Water Level Made Isolation Logic Inoperable.Caused by Procedural Inadequacy.Procedure Revised ‎ (← links)
  • 05000461/LER-1986-007, :on 861009,while Performing Operability Surveillance,Rwcu Sys Isolated on High Differential Flow. Caused by Lack of Venting & Filling of Sys Prior to Sys Restoration.Procedure Being Revised ‎ (← links)
  • 05000461/LER-1986-011, :on 861016,automatic Initiation of Div 1 Shutdown Svc Water Sys Pump Occurred.Caused by Deficiency in Surveillance Procedure.Procedure Corrected Using Procedure Deviation for Rev (PDR) 86-1271 ‎ (← links)
  • 05000461/LER-1986-015, :on 861021,during Removal of Panel,Panel Slipped Into Exposed Breaker Handles,Causing All Even Numbered Breakers to Change to Off Position.Caused by Lack of Attention to Detail.Breakers Restored ‎ (← links)
  • 05000461/LER-1986-010, :on 861015,main Control Room Received Auto Initiation of Reactor Protection Sys Trip Function.Caused by Spurious Divisional Main Steam Line Radiation hi-hi or Inoperable Trip.Shielding Added ‎ (← links)
  • 05000461/LER-1986-002, :on 860930,secondary Containment Negative Pressure Lost.Caused by Deliberate Defeat of Interlock Switches on Airlock Doors by Contractor Foreman.Foreman Terminated ‎ (← links)
  • 05000461/LER-1986-006, :on 861008 & 15,essential Svc Water Sys Initiated.Caused by Transient Pressure Drop in Nonessential Svc Water.Calibr of Low Pressure Switches Will Be Checked & Operating Procedures Revised ‎ (← links)
  • 05000461/LER-1987-008, :on 870408,support Staff Investigating Change to Procedure CPS 9000.01 Identified Procedure Deficiency That Resulted in Shiftly Channel Checks for Containment High Isolation Instrumentation Not Being Performed ‎ (← links)
  • 05000461/LER-1987-022, :on 870407,three Level Instruments Actuated on Creation of Pressure Transient.Caused by Personnel Error While Venting Instrument Process Lines.Personnel Retrained & Appropriate Procedural Guidance Developed ‎ (← links)
  • 05000461/LER-1987-014, :on 870315,automatic Actuation of HPCS Sys Occurred.Caused by Util Control & Instrumentation Technician Error When Refilling Level Transmitter After Dry Calibr. Technician Counseled ‎ (← links)
  • 05000461/LER-1987-029, :on 870524,motor Driven Reactor Feed Pump Feedwater Regulating Valve 1FW004 Malfunctioned Causing High Water Level Transient.Caused by Failure of Regulating Valve. Mode Selector Switch Placed in Shutdown ‎ (← links)
  • 05000461/LER-1986-020, :on 861110,HPCS Sys Pump Suction Valve Alignment auto-shifted from RCIC to Suppression Pool.Caused by RCIC Storage Tank Level Transmitter Tripping Due to Rust Particulate Inside One Transmitter ‎ (← links)
  • 05000461/LER-1987-028, :on 870518,noble Gas Detector Chamber Pressure Correction Factor Improperly Applied During Calibr Procedures on Gaseous Effluent Monitors.Caused by Personnel Error.Procedures Revised & Calibr Corrected ‎ (← links)
  • 05000461/LER-1987-027, :on 870513,automatic Isolation of Rwcs on HX Room High Temp Isolation Signal Occurred.Caused by Flow Control Valve Malfunction.Caution Tag Placed on Valve ‎ (← links)
  • 05000461/LER-1987-026, :on 870511,high Pressure Core Spray Automatically Actuated.Caused by Personnel Error.Procedure Revised to Require Instruments to Be Repressurized to Existing Sys Pressure Prior to Valving ‎ (← links)
  • 05000461/LER-1987-025, :on 870506,feedwater Control Valve 1FW004 Failed as Is in Open Position & Reactor Water Level Began to Rise.Caused by Ruptured Pressure Switch.Pressure Switch Replaced & Exposed Components Cleaned ‎ (← links)
  • 05000461/LER-1987-024, :on 870501,RWCU Sys Automatically Isolated Two Times Due to High Differential Flow Signal.Caused by Flow Perturbations Compounded by Error in Circuitry & Personnel Error.Sys Stabilized & Returned to Svc ‎ (← links)
  • 05000461/LER-1986-014, :on 861021,standby Gas Treatment Sys B Exhaust Fan Energized Indicating Light Was Lit.Fan Running W/O Justification.Caused by Jumper Design Configuration & Personnel Error.Configuration Restored ‎ (← links)
  • 05000461/LER-1987-023, :on 870419,during Startup,Failed Detector Assembly in Containment Exhaust Process Radiation Monitor Automatically Isolated Div II Hydrogen/Oxygen Monitor.Caused by Personnel Error.Detector Assembly Replaced ‎ (← links)
  • 05000461/LER-1987-019, :on 870324,automatic Depressurization Sys Safety Relief Valve Lifted & Reseated 14 Times.Caused by Failure of Load Driver.Procedure Revised to Prevent Inadvertent Actuation of Valve ‎ (← links)
  • 05000461/LER-1986-017, :on 861024,during Mode 5 & Rod Scram Testing, ESF Actuation of Reactor Protection Sys Trip Function Occurred.Caused by Spiking on intermediate-range Monitor a Due to Noise When Control Rods Inserted ‎ (← links)
  • 05000461/LER-1987-017, :on 870322,while in Mode 2,manual Reactor Scram Initiated After Control Room Operator Observed That Control Rods Drifting Into Reactor Core.Caused by Operator Error. Surveillance Procedure Will Be Revised ‎ (← links)
  • 05000461/LER-1987-018, :on 870322,during Div II Diesel Operability test,cross-tie Valve 1SX-014A Mistakenly Closed.Caused by Personnel Error.Operator Counseled.Breaker Tripped & Valve Manually Closed ‎ (← links)
  • 05000461/LER-1987-003, :on 870218,chlorine Detector OXE-VC118A Reading Higher than Normal.Caused by Broken Edge Connector Pin in Chlorine Detector.Broken Connector Pin Replaced & Detector Calibr & Returned to Svc ‎ (← links)
  • 05000461/LER-1997-025, :on 971002,design Deficiency Resulted in Plant Being Outside Design Basis for Fire in Main CR Potentially Damaging Valves Required in Safe Shutdown of Plant.Cause Could Not Be Determined.Will Analyze MOV Control Circuits ‎ (← links)
  • 05000461/LER-1998-020-01, Forwards LER 98-020-01, Inadequate Flow Balancing of Shutdown SWS Results in Less than Required Flow to SWS Loads. Revised LER Provides Cause of Event & Corrective Actions ‎ (← links)
  • 05000461/LER-1999-011, :on 990816,improper Restoration of a APRM Caused Monitor to Not Meet Seismic Qualification Requirements.Caused by Lack of Knowledge.Page Latches for Other APRMs Were Inspected & No Anomolies Were Found ‎ (← links)
  • 05000461/LER-1987-004, :on 870121,reactor Vessel Low Level Sensing Instruments 1B21-N091A & 1B21-N091E Produced False Low Level Signal Resulting in Div I ECCS Actuation.Caused by Hydraulic Surge.Affected Equipment Restored ‎ (← links)
  • 05000461/LER-1987-007, :on 870129,safety Relief Valve B21F041F Actuated,Causing Loss of Coolant from Reactor Vessel.Caused by 10 K Ohm Short in Control Circuitry of Valve.Loss of Coolant Stopped by Stroking of Valve ‎ (← links)
  • 05000461/LER-1986-021, :on 861114,unplanned Automatic Isolation of RWCU Occurred Due to Pump Room a High Temp Trip Signal. Caused by Work Being Performed on Temp Sensing Thermocouple. Addl Controls Added to Preclude Recurrence ‎ (← links)
  • 05000461/LER-1987-005, :on 870122,during Performance of Surveillance Procedure 9030.01 C016,containment Air Header Isolation Valves 1IA006 & 1IA007 Isolated.Caused by Technician Error. Low Level Signal Removed & Valves Reopened ‎ (← links)
  • 05000461/LER-1996-014-01, Forwards LER 96-014-01,containing Cause for Event & Corrective Actions to Prevent Recurrence Re Inadequately Tested Auxiliary Bldg Roof Plug.Commitments,Listed ‎ (← links)
  • 05000461/LER-1986-013, :on 861019,control Room Operator Placed source- Range Monitor Channel C Out of Operate,Causing Reactor Protection Sys Trip.Caused by Operator Failure to Follow Procedures.Operator Counseled.Scram Reset ‎ (← links)
  • 05000461/LER-1997-009-01, Forwards LER 97-009-01 Re Identification of Surveillance Procedure Which Does Not Adequately Consider Accuracy of Installed Instrumentation in Meeting TS Requirements for Reactor Core Isolation Cooling Pump.Commitments,Liste ‎ (← links)
  • 05000461/LER-1997-018, :on 970823,inadequate Preventive Maint Led to Possible Failure of Westinghouse Dhp Circuit Breakers to Open on Demand.Performed Corrective Maint Tasks on Dhp Circuit Breakers ‎ (← links)
  • 05000461/LER-1997-020, :on 970715,discovered Failure to Document Effect of Degraded Coatings in Containment on Eccs.Caused by Failure of Personnel to Perform Evaluation on Degraded Coatings.Performed Evaluation & Removed Degraded Coatings ‎ (← links)
  • 05000461/LER-1987-020, :on 870330,RWCU Sys Automatically Isolated Due to High Differential Flow Trip Signal.Caused by Operator Error.Operators Trained on Equalizing Around & Opening Msivs.Procedure 3002.01 Revised ‎ (← links)
  • 05000461/LER-1987-021, :on 870330,automatic Isolation of RCIC Sys Occurred.Caused by Personnel Error When Trip Signal Inserted to one-out-of-one Isolation Logic.Personnel Counseled.W/ ‎ (← links)
  • 05000461/LER-1999-009, :on 990617,failure to Satisfy Secondary Containment Bypass Leakage Rate TS Was Noted.Caused by Failure to Properly Classify Containment Penetrations. Procedures Revised.With ‎ (← links)
  • 05000461/LER-1986-022, :on 861201,util Control Room Personnel Noticed That Control Rod 24-21 Was at Position 02 Instead of 00 Violating Tech Spec 3.0.4.Caused by Personnel Error.Rod Fully Inserted & Switch Placed in Shutdown ‎ (← links)
  • 05000461/LER-1987-002, :on 870212,main Control Room Ventilation Sys Train a Shifted to High Chlorine Mode.Caused by Operator Removing Optic Bulb of Chlorine Detector.Warnings Placed on Chlorine Detectors ‎ (← links)
  • 05000461/LER-1986-024, :on 861210,Group I Containment Isolation Signal Generated Resulting in Closure of Main Steam Drain Valves B21-F016 & B21-F019.Caused by Failure of Maint Planners to Review Documents When Preparing Impact Matrix ‎ (← links)
  • 05000461/LER-1986-023, :on 861207,shutdown Discharge Vol High Level Alarm Received in Main Control Room,Resulting in Actuation of Reactor Protection Sys Scram Trip Function.Caused by Personnel Error.Shift Supervisors Briefed ‎ (← links)
  • 05000461/LER-1999-001, :on 990129,determined Degradation of Bearings in Two Divisions of Shutdown Sws.Caused by Improper Assembly of Motor.Revised Vendor Manuals & Procedures to Address Shaft Current Concerns for Susceptible Motors ‎ (← links)
  • 05000461/LER-1999-004, :on 990126,plant Was Operating Outside Design Basis.Caused Because Design for CR Operator Dose Calculation Did Not Consider Single Failure of CR Ventilation Sys. Revised CR Operator Dose Calculation.With ‎ (← links)
  • 05000461/LER-1999-006, :on 990419,values Used for Containment & Drywell Free Vols Found to Be Smaller than Originally Analyzed Due to Inadequate Calculation Control During Initial Plant Const.With 9905517 Ltr ‎ (← links)
  • 05000461/LER-1998-014-01, Design Failure Analysis for FW Piping Does Not Match Fatigue Analysis for FW Nozzles Resulting in Condition Outside of Design Basis for Plant, Has Been Cancelled ‎ (← links)
  • 05000461/LER-1987-016, :on 870317,automatic Actuation of Containment Isolation Valve 1E51-F063 Occurred.Caused by Control & Instrumentation Technician Error.Technician Counseled.W/ ‎ (← links)
  • 05000461/LER-1987-013, :on 870310,18,21 & 31,RWCU Sys Automatically Isolated.Caused by Differential Flow Detector Sensitivity to Flow/Pressure Oscillations.Rwcu Sys Will Be Removed from Svc During Periods of Very Low Feedwater Flowrates ‎ (← links)
  • 05000461/LER-1987-011, :on 870310 & 11,shifting of Main Control Room Ventilation Sys to High Chlorine Mode Occurred.Caused by Exceeding Trip Setpoint.Mods to Raise Alarm Setpoint on Chlorine Detectors Planned ‎ (← links)
  • 05000461/LER-1987-010, :on 870308,main Control Room Ventilation Sys Train a Shifted to High Chlorine Mode on Signal from Chlorine Detector OXE-VC018B.Caused by Discolored Chlorine Sensitive Tape.Maint Work Request Written ‎ (← links)
  • 05000461/LER-1987-015, :on 870309,RCIC Steam Tunnel Temp Timers Not Adequately Tested by Existing Monthly Functional Test.Caused by Deficient Functional Test Procedures.Penetrations Isolated & Channel Calibr Procedure Performed ‎ (← links)
  • 05000461/LER-1998-030-01, Insufficient Suppression Pool Makeup Volume to Meet Design Basis Suppression Pool Level Requirements Following LOCA, Has Been Cancelled ‎ (← links)
  • 05000461/LER-1998-013-01, Forwards LER 98-013-01, Remote Shutdown Panel Operation of Rcics May Be Prevented Following MCR Fire,Due to Supplier Design Lacking Circuit Isolation & 10CFR21 Rept Number 21-98-026.Without Part 21 Rept ‎ (← links)
  • 05000461/LER-1987-009, :on 870306,exhaust Fan a of Fuel Bldg Ventilation Sys Tripped.Caused by Failure of Solenoid Valve on Fuel Bldg Supply Outboard Isolation Damper.Standby Gas Treatment Sys Started & Solenoid Replaced ‎ (← links)
  • 05000461/LER-1987-012, :on 870310,main Control Room Ventilation Sys Train B Shifted to High Chlorine Mode.Caused by Depletion of Chlorine Sensing Tape Cassette.New Tape Cassette Installed & Detector OXE-VC118B Returned to Svc ‎ (← links)
  • 05000461/LER-1999-005, :on 990129,inoperability of Standby Gas Treatment Sys Train a Was Noted.Caused by Inadequate Design of Control Circuit.Determined Correct in-rush Current for Itt Barton Actuator NH95 Solenoids ‎ (← links)
  • 05000461/LER-1998-006, :on 980131,incorrect Calculation in DG Control Circuitry Results in Insufficient Voltage & Inoperability of Div 1 Dg,Was Discovered.Caused by Initial Error in Calculation.Dg Control Panel Voltage Restored ‎ (← links)
  • 05000461/LER-1997-029, :on 971113,failure to Follow Plant Procedure When Erecting Scaffold Resulted in SR Area Cooler Becoming Inoperable Due to Seismic Qualification Concerns.Caused by Failure to Follow Plant Procedure.Modified Scaffold ‎ (← links)
  • 05000461/LER-1998-002, :on 980123,loss of Svc & Instrument Air Occurred Due to Trip of Operating Air Compressor.Caused by Inadequate Design in Control of Cooling Water Supply to Compressors Lube Oil Coolers.Will Modify Components ‎ (← links)
  • 05000461/LER-1998-036-01, Forwards LER 98-036-01,re Opening Incorrect Electrical Cubicle,Causing Loss of SD Cooling & Leading to Failure to Meet TS Required Action in Required Time.Encl Rept Contains Listed Commitments ‎ (← links)
  • 05000461/LER-1998-001, :on 970929,failure of Division 2 SR Battery Charger Was Noted.Caused by Deficient Supplier Soldered Connections.Insp of Division 1,2 & 4 SR Battery Chargers Are Complete & Have Been Reworked & Repaired ‎ (← links)
  • 05000461/LER-1999-002, :on 990106,loss of Offsite Power to SR Electrical Buses Was Noted.Caused by Offsite Fault on in Service Offsite Electrical Supply Line.Repairs Were Made to Faulted Line & Leaning Support Structure.With ‎ (← links)
  • 05000461/LER-1997-023, :on 971107,potential Overgreasing of Motor Bearings Causing Potential Failure of Various Motors,Was Determined.Caused by Inadequate Work Instructions.Briefed Electrical & Maint Supervisors on Issue ‎ (← links)
  • 05000461/LER-1997-027, :on 900831,installation of Mod of RHR Sys Was Outside Plant Design Basis.Caused by Misinterpretation of 10CFR50.59.Reviewed Current Safety Evaluation Program & Mod to RHR Sys Will Be Installed ‎ (← links)
  • 05000461/LER-1998-037, :on 981215,identified That SR 3.3.3.1.2,which Requires Channel Calibr of Drywell & Primary Containment Hydrogen & Oxygen Analyzers Not Properly Implemented.Caused by Lack of Info Validation & Verification.Procedure Revised ‎ (← links)
  • 05000461/LER-1997-022-01, Forwards LER 97-022-01 & 10CFR21 Rept 21-97-036 Re Design of DG Ventilation Subsystems Outside Design Basis as Result of Failure to Include Min & Max Outside Air Temps Extremes,Due to Design Error.Ler Contains Listed Commitm ‎ (← links)
  • 05000461/LER-1998-028, :on 981205,thermal Induced Pressure Locking of SR Power Operated Gate Valves Was Noted.Caused by Inadequate Initial Design.Evaluated GL 95-07 Valves for Susceptibility to Thermal Induced Pressure Locking ‎ (← links)
  • 05000461/LER-1997-033, :on 971218,shift Supervisor Recognized That Containment Bldg Fuel Transfer Pool Ventilation Plenum Exhaust Radiation Monitors Declared Inoperable.Caused by Misinterpretation of Tech Specs.Operations on TS Revised ‎ (← links)
  • 05000461/LER-1997-036, :on 971222,engineering Completed Evaluation of Missing Motor Shaft Key That Connects Motor to Fan Hub of Div II Shutdown SW Pump Room Cooler.Caused by Inoperability of Room Cooler.Cooling Fan Restored,Per 10CFR21 ‎ (← links)
  • 05000461/LER-1997-024, :on 970830,failure to Comply W/Ts Action Statement to Immediately Restore AC Power Sources Was Determined.Caused by Inadequate Interpretation of TS Action. Licensing Providing Staff Guidance ‎ (← links)
  • 05000461/LER-1998-026, :on 860929,inoperable EP Assembly Circuit Cards Which Monitor Power to RPS Scarm & MSIV Sv Were Noted.Caused by Improper Design of EP Assembly Circuit Cards by Supplier. Procured & Installed Correctly Designed Circuit Cards ‎ (← links)
  • 05000461/LER-1997-028, :on 971126,identified Inoperability of All in-service 33 480-volt K-line safety-related Circuit Breakers.Caused by Failure of ABB to Supply Properly Qualified Components Per 10CFR21.Will Replace Components ‎ (← links)
  • 05000461/LER-1986-012, :on 861018,during Mode 5 RWCU Surveillance, Inboard Containment Isolated Due to Transmitter Venting. Caused by Personnel Error.Technicians Given Addl Training on Venting Techniques ‎ (← links)
  • 05000461/LER-1986-016, :on 861021,core Alterations Authorized to Begin W/Standby Gas Treatment Sys Inoperable,Violating Tech Specs. Caused by Failure of Operator to Review Operating Conditions.Personnel Counseled, ‎ (← links)
  • 05000461/LER-1997-030-01, Forwards LER 97-030-01,re Failure to Verify That RWCU Sys Was Available as Alternate Means of Shutdown Cooling Due to Procedural Inadequacy.Commitments Made within Ltr,Listed ‎ (← links)
  • 05000461/LER-1997-031, :on 971113,inadequate Testing of SR Logic Circuits Resulted in Failure to Meet TS Sr.Cause Has Not Been Determined.No Actions Have Been Taken at Present Time ‎ (← links)
  • 05000461/LER-1997-026-01, Forwards LER 97-026-01,re Inadequate Procedure for Insp of Shutdown Swps for Excess Silt Which Resulted in Shutdown Swp Inoperability.Commitments Made in Rept,Listed ‎ (← links)
  • 05000461/LER-1986-005, :on 861007,firewatch Rounds for Impaired Barriers Started Late.Caused by Personnel Negligence. Contract Employee Suspended & Subsequently Resigned ‎ (← links)
  • 05000461/LER-1986-004, :on 861001,automatic Initiation of Standby Gas Treatment Sys Occurred Following Containment Fuel Transfer Vent Plenum High Radiation Signal.Caused by Personnel Error & Faulty Procedures ‎ (← links)
  • 05000461/LER-1986-003, :on 860930,control Room Ventilation Sys Train B Shifted to High Chlorine Mode of Operation.Caused by Broken Detector Tape in Chlorine Detector Due to Excess Spring Tension Causing Excessive Drag on Tape.Tape Rethreaded ‎ (← links)
  • 05000461/LER-1986-001, :on 860930,RWCU Pump Room 3 Temp High Annunciator Alarmed in Main Control Room.Probably Caused by Grounds in Temp Module Coincident W/Thermocouple Grounds. Ground Corrected ‎ (← links)
  • 05000461/LER-1988-022, :on 880901,automatic Initiation of HPCS Sys Injection of Water Into Reactor Occurred.Caused by False Low Reactor Pressure Vessel Water Level Signal.Technicians Briefed on Event ‎ (← links)
  • 05000461/LER-1988-024, :on 881019,failure to Recognize Inoperable Damper Impact Results in Inoperable Control Room Ventilation Sys Initiation of Tech Spec 3.0.3 Shutdown.Caused by Personnel Error.Ventilation Sys Clarified ‎ (← links)
  • 05000461/LER-1998-035, :on 981016,failure to Comply with TS Action Requirements to Immediately Restore AC & DC Electrical Power Sources,Was Discovered.Caused by Inadequate Communications. LCO Tracking Database for Daily Rept Will Be Revised ‎ (← links)
  • 05000461/LER-1999-007, :on 990513,main Steam Isolation Valve Leakage Control Sys Was Noted Outside Design Basis.Caused by Design Error.Revised Setpoint for Each MSIV-LCS Flow Measurement Channel to Meet Design Basis of Plant ‎ (← links)
  • 05000461/LER-1999-008, :on 990514,reactor Vessel Level Transient Was Noted.Caused by Failure of Motor Driven Reactor FW Pump Regulating Valve.Initiated Manual Scram & Fixed Procedure Discrepancies ‎ (← links)
  • 05000461/LER-1998-033, :on 981007,inappropriate Clearing of Caution Tagout Resulted in Improved TS LCO 3.4.10 Action A.1 Not Being Met.Caused by Tunnel Vision & Inattention to Detail. New Caution Tagout for Div 2 Shutdown Svc Water,Established ‎ (← links)
  • 05000461/LER-1988-015, :on 880509,motor-operated Flush Valve on Off Gas Pretreatment Process Radiation Monitor Discovered Partially Open.Caused by Util Control & Instrumentation Technician Error.Procedure Revised for Clarity ‎ (← links)
  • 05000461/LER-1988-023, :on 880901,personnel Discovered Flush Valve for HVAC Monitor Grab Sample Pallet Open.Cause Attributed to Personnel Error.Procedures Upgraded to Require Performance of Complete Valve Lineup ‎ (← links)
  • 05000461/LER-1998-024-01, Forwards LER 98-024-01,re Failure to Perform Surveillance Testing on Div II 4.16 Kv Bus Uvr within Specified Frequency.Commitments Listed ‎ (← links)
  • 05000461/LER-1998-027, :on 980918,failure to Perform Surveillance Testing on Div II 4.16 Bus Uvr within Specified Frequency Was Noted.Caused by Inadequate Software Change Mgt.Performed Testing on Div II 4.16 Kv Bus Uvr ‎ (← links)
  • 05000461/LER-1988-012, :on 880429,standby Gas Treatment Sys Considered to Be Inoperable as Result of Indeterminate Equipment Qualification (EQ) of Damper Actuators.Caused by Failure to Adequately Control EQ Program Results ‎ (← links)
  • 05000461/LER-1988-014, :on 880502,containment Personnel Airlock Door Sys Determined to Be Inoperable.Caused by Insufficient post-maint Testing.Personnel Responsible for Inadequate Evaluation Counseled ‎ (← links)
  • 05000461/LER-1988-013, :on 880430,two Instrument Air Sys Containment Isolation Valves Automatically Isolated Due to Spurious Div I Low Reactor Water Level Trip Signal.Caused by Faulty Card Select Decoder.Decoder Replaced ‎ (← links)
  • 05000461/LER-1988-021, :on 880811,RWCU High Differential Flow Signal Caused Div II RWCU Containment Isolation Valves to Close, Isolating RWCU Sys.Caused by Failure of Bypass Switch.Switch Replaced & Faulty Switch Returned to Mfg ‎ (← links)
  • 05000461/LER-1988-017, :on 880624,Agastat GP Relay Failed Resulting to Relay Contact Oxide Buildup,Loss of Control Signal & Reactor Scram.Caused by GE Design Error.Relay Contacts Cleaned or Replaced & Tested.Reported Per Part 21 ‎ (← links)
  • 05000461/LER-1998-032, :on 980929,noted That Excessive Voltage Drop in Control Circuit for Division 3 Diesel Output Circuit Breaker Could Result in Plant Being Outside Design Basis.Caused by Inadequate Design.Prepared Design Change of Control Circuit ‎ (← links)
  • 05000461/LER-1988-020, :on 880806,discovered That Div II Shutdown Svc Water Radioactive Liquid Effluent Monitor Incorrectly Declared Operable.Caused by Vague Communications. Departmental Responsibilites Clarified ‎ (← links)
  • 05000461/LER-1998-030, :on 980828,insufficient Sp Makeup Vol to Meet Design Basis Sp Level Requirements Following LOCA Was Noted. Cause of Event Is Under Investigation.Corrective Actions to Event Are Pending Outcome of Investigation ‎ (← links)
  • 05000461/LER-1998-031, :on 860929,SP Did Not Adequately Consider Accuracy of Installed Instrumentation in Meeting TS Requirements for DG Loading.Caused by Lack of Rigor in Documentation of Evaluations.Reviewed TS SR Parameters ‎ (← links)
  • 05000461/LER-1988-011, :on 880311,drywell Air Coolers Condensate Flow Monitoring Sys Taken Out of Svc Due to Channel Reading Low.On 880407,drywell Air Coolers Condensate Flow Rate Turbine Meters Inoperable Due to Clogged Lines ‎ (← links)
  • 05000461/LER-1988-009, :on 880401,instrument Air Sys Containment Isolation Valves 1IA006/7 Automatically Closed After Installation of Load Driver Circuit.Caused by Incorrect Use of Impact Matrix.Personnel Trained ‎ (← links)
  • 05000461/LER-1998-029, :on 860929,discovered That Conductors in Two Containment Electrical Penetrations Did Not Have Adequate Overcurrent Protection.Caused by Original Design Error for Plant.Will Design & Install Required Protective Devices ‎ (← links)
  • 05000461/LER-1988-019, :on 880712,all Three Circulating Water Pumps Automatically Shut Down Causing Rapid Loss of Condenser Vacuum.Caused by Random Failure of Condenser Pit High Water Level Switch.Switch Replaced ‎ (← links)
  • 05000461/LER-1988-018, :on 880707,HPCS Pump Room Fan Which Was Required to Be Running Continuously,Found Shutdown.Caused by Insufficient Review of Tag Instructions.Individuals Involved Counseled & Memo Issued to Operators ‎ (← links)
  • 05000461/LER-1988-010, :on 880401,discovered That Shift Control Room Operator Surveillance Log - Mode 4 Data Sheet Not Completed. Caused by Oversight by Control Room Operator.Operators Counseled ‎ (← links)
  • 05000461/LER-1988-007, :on 880314,surveillance Testing Identified That Ventilation Fan for Div II Diesel Generator Failed to Trip During Carbon Dioxide Initiation.Caused by Failure to Understand Sys.Design Changes Implemented ‎ (← links)
  • 05000461/LER-1988-008, :on 880320,identified That MSIV Leakage Rates Exceeded Tech Specs Limits.Caused by Component Wear Based on Svc Seen During Power Ascension Program & Initial Plant Operation.Two MSIVs Reworked ‎ (← links)
  • 05000461/LER-1988-005, :on 880216,drywell Atmosphere Particulate Radioactivity Monitor Alarmed,Indicating High Drywell Atmosphere Radioactivity Level.Caused by Operator Errors. Event Reviewed W/Personnel Involved ‎ (← links)
  • 05000461/LER-1988-004, :on 880129,discovered That Manipulation of Incorrect Temp Controller Resulted in Inoperable Div 1 Primary Containment Hydrogen Recombiner W/Div II Diesel Generator Inoperable.Caused by Operator Error ‎ (← links)
  • 05000461/LER-1996-013, :on 961015,inadequate Actuator Design Occurred. Caused by Svc Conditions Experienced & Inherently Stringent Leakage Criteria.Procedure Revised ‎ (← links)
  • 05000461/LER-1996-013-01, Forwards LER 96-013-01 Re Inadequate Actuator Design & Failure to Recognize Limitations of Resilient Seat Design Result in Local Leak Rate Test Feedwater Containment Isolation Valves ‎ (← links)
  • 05000461/LER-1997-016, :on 970617,failure to Provide Emergency Lighting for Safe Shutdown Equipment as Required by Plant Design Basis Was Noted.Cause Could Not Be Determined.Review of Each Fire Area in SSA Conducted ‎ (← links)
  • 05000461/LER-1988-003, :on 880114,containment Monitoring Sys Containment Isolation Valves Isolated.Caused by Malfunction of Process Radiation Monitor.Procedures Revised to Require Addl Check Source Valve Confirmation ‎ (← links)
  • 05000461/LER-1988-002, :on 880106,spurious Electrical Spike on Div 1 Continuous Containment Purge (CCP) Sys Exhaust Process Radiation Monitor Output Caused CCP Sys to Isolate.Caused by Detector Tube Failure.Tube Replaced ‎ (← links)
  • 05000461/LER-1997-003, :on 970128,failed to Recongnize Impact of Disconnecting Div 1 IRM Cable While Div 2 IRM Cable Was Disconnected Resulted in 2 Out of 4 RPS Actuation Being Satisfied.Caused by Personnel Error.Counseled Personnel ‎ (← links)
  • 05000461/LER-1988-001, :on 880101,two Containment Isolation Valves Closed During Trending of Main Steam Line Causing RWCU Pumps to Trip & Isolation of RWCU Sys.Caused by Random Failure of Temp Module.Temp Module Replaced ‎ (← links)
  • 05000461/LER-1988-006, :on 880229,Div II Containment Exhaust Process Radiation Monitor Tripped to low-fail Condition.Caused by Personnel Error Due to Inadequate Accessibility & Visibility of Detector.Existing Scaffolding Replaced ‎ (← links)
  • 05000461/LER-1997-006, :on 970219,lack of Coordination of 120 Volt non-safe Shutdown Circuit Breakers in Distribution Panels W/Shutdown Circuit Breakers Causes Plant to Be Outside Its Basis.Corrected Circuit Breaker Problems ‎ (← links)
  • 05000461/LER-1987-068, :on 871211,standby Gas Treatment Sys High Range Radioactivity Monitor Inoperable Due to Missing Filter. Caused by Personnel Error by Unknown Person.Monitor Monthly Channel Check Surveillance Procedure Revised ‎ (← links)
  • 05000461/LER-1987-070, :on 871207,unqualified Equipment Installed Resulting in Inoperable Drywell High Pressure Transmitters. Caused by Personnel Error Due to Insufficient Research. Temporary Mod Procedure Revised ‎ (← links)
  • 05000461/LER-1997-006-01, Forwards LER 97-006-01 Re Lack of Coordination of 120 Volt non-safe Shutdown Circuit Breakers in Distribution Panels W/Safe Shutdown Circuit Breakers,Causes Plant to Be Outside Design Basis ‎ (← links)
  • 05000461/LER-1997-019, :on 860929,switchgear Heat Removal Sys Fan Discharge Damper Control Circuit Routed Through MCR Was Not Per Design Basis Due to Design Error.Installed Temporary Mod to Disconnect Damper Indication to MCR ‎ (← links)
  • 05000461/LER-1997-017, :on 970613,failed to Properly Calibrate MSL Radiation Monitoring.Caused Because Design Document That Provided Setpoints to Be Used Prior to Startup Did Not Address Need to Recalibrate Monitors.Revised Procedure ‎ (← links)
  • 05000461/LER-1997-014, :on 880426,MSIV Closure Time Testing Was Not Adequate,Due to Procedural Inadequacy.Revised DPS 9061.09 to Account for Full Valve Travel & Verified MSIV Operability Before Plant Start Up ‎ (← links)
  • 05000461/LER-1997-011, :on 860929,failed to Verify Breaker Closed at seven-day Frequency Required by TS Due to Omission of Breaker from Surveillance Procedure.Caused by Inadequate Procedures.Revised Procedures ‎ (← links)
  • 05000461/LER-1997-013, :on 970508,failure to Adequately Verify That No Trips Existed During Surveillance Test Resulted in Inadvertent Actuation of Sgts.Caused by Personnel Error. Procedure CPS 9532.61 Was Revised ‎ (← links)
  • 05000461/LER-1996-012, :on 910316,failed to Demonstrate Operability of Offsite Power Sources within One Hr During Surveillance While Div 3 EDG Governor Speed Droop Control Set to 50% Due to Inadequate Procedures.Revised Procedures ‎ (← links)
  • 05000461/LER-1997-008, :on 920408,determined That DG Undervoltage Relays Inoperable Due to Inadequate Process to Review Operability Requirements of Plant Equipment as Defined in Ts.Amend Requested to Change TS ‎ (← links)
  • 05000461/LER-1997-007, :on 970227,lack of Procedural Guidelines for Maintaining Seismic Qualification Resulted in Division 3 Switchgear Outside Design Basis.Revised CPS Procedures.W/ ‎ (← links)
  • 05000461/LER-1996-016, :on 950402,residual Water Observed Covering Portion of Disc/Seat Area.Caused by Plant Design Not Allowing Complete Draining of FW Lines.Drain Valves Installed on Bottom of Isvs & Rev of Test Procedures ‎ (← links)
  • 05000461/LER-1996-016-01, Forwards LER 96-016-01:re Residual Water Covering Portion of Disc/Seat Area During Testing Due to Design Not Allowing Complete Draining Results in Invalid Local Leak Rate Testing of Feedwater Containment Isolation ‎ (← links)
  • 05000461/LER-1997-004, :on 970204,failed to Properly Implement TS SR 3.6.5.3.3 Due to Inadequate Procedure.Revised Surveillance Procedure to Verify Valves Closed ‎ (← links)
  • 05000461/LER-1996-017, :on 961102,div 3 DG Failed to Energize Emergency Bus within Required Time Limit.Caused by Personnel Misinterpretation of Setpoint Data.Added Note to Drawing to Clearly Show Setpoint ‎ (← links)
  • 05000461/LER-1997-001, :on 970103,nuclear Fuel Supplier Failed to Analyze Turbine Pressure Regulator Downscale Failure Event in off-rated Condition Per 10CFR21.21.Caused by Error in Nuclear Fuel Supplier.Mcpr Will Be Implemented ‎ (← links)
  • 05000461/LER-1996-020, :on 961223,failure of CR Drive Hydraulic Control Unit Air Line Occurred Due to Overtightening Fitting During Maintenance to Correct Air Leak.Broken Air Line Was Replaced in Accordance with Mwr D61669 ‎ (← links)
  • 05000461/LER-1996-019, :on 961120,inadequate Surveillance Procedures Were Noted Due to Misinterpretation of TS Bases Results in Source Range Monitor Reactor Period Display Not Verified. Procedures CPS 9031.13 Will Be Revised ‎ (← links)
  • 05000461/LER-1996-018, :on 961014,incorrect Torque Value for Control Rod Drive Hydraulic Control Units Was Specified by Supplier. Caused by Lack of Attention to Detail.All Hold Down Bolts on CRD HCUs Were Replaced ‎ (← links)
  • 05000461/LER-1996-011, :on 961002,EDG Surveillance Test Procedures Written to Satisfy TS (SR) 3.8.1.7, 3.8.1.12 & 3.8.1.19 Were Inadequate.Caused by Lack of Guidance in Surveillance Procedure.Procedures Revised ‎ (← links)
  • 05000461/LER-1992-011, :on 921123,lack of Procedure for Software Changes to Hydrogen & Oxygen Analyzers Results in One of Two Analyzers Being Inoperable During Plant Mode Change.Caused by Lack of Work Document.Procedure Revised ‎ (← links)
  • 05000461/LER-1996-009, :on 960808,inadequate Procedure Leads to Failure to Properly Implement TS Surveillance.Caused Appears to Be Misinterpretation of Ts.Cps Procedure 9065.02 Performed at Frequency Required by TS ‎ (← links)
  • 05000461/LER-1996-005, :on 960411,failure to Follow Procedures During Completion of one-rod-out Interlock Test Results in Reactor Mode Switch Not Locked in Refuel During Control Rod Exercising as Required by TS ‎ (← links)
  • 05000461/LER-1996-007, :on 960529,discovered Inoperable Leak Detection Instruments.Caused by Personnel Error.Personnel Briefed Re Event & Labelled Both Reactor Water Cleanup Sys HX Rooms Ceiling Plugs ‎ (← links)
  • 05000461/LER-1992-009, :on 920729,determined That Testing of Diesel Fuel Oil for EDGs Not Performed Per TS 4.8.1.1.2.d.3.Caused by Personnel Error.Ts Change Request Re Alternate Test Method Submitted to NRC on 920817 ‎ (← links)
  • 05000461/LER-1992-007-01, :on 920623,determined That Previously Performed Testing for Loss of Power Not in Accordance W/Ts.Caused by Misinterpretation of Test Requirements by Writers. Procedures Will Be Revised Per TS ‎ (← links)
  • 05000461/LER-1996-006, :on 960529,degraded Control Room HVAC Train Declared Inoperable.Caused by Personnel Error.Briefed Personnel Re Event & Developed Standing Order ‎ (← links)
  • 05000461/LER-1996-004, :on 960409,inadequate Job Preparation for Preventive Maint Task on Switchyard Breaker Caused MSIV Closure & Reactor Scram.Plant Procedures Revised ‎ (← links)
  • 05000461/LER-1992-007, :on 920515 & 0623,determined That Previously Performed Surveillance Test Procedures for Loss of Offsite Power Testing Not Conducted Per Ts.Caused by Improper Interpretation of Ts.Test Procedure Revised ‎ (← links)
  • 05000461/LER-1992-008-01, :on 920623,inattention to Detail Surveillance Resulted in Mispositioning Reactor Mode Switch & Actuation of Containment Isolation Valves & Reactor Protection Sys. Operator Counseled ‎ (← links)
  • 05000461/LER-1996-003, :on 951118,failure of Procedure to Recognize MSL Radiation Monitor Detector Housing Tube as Secondary Cl Path Resulted in Operable Secondary Containment During Corrective Maint.Revised Procedure ‎ (← links)
  • 05000461/LER-1996-002, :on 960131,discovered HPCS Sys High Reactor Vessel Water Level seal-in & Ready to Reset Lamps.Caused by Spurious High Reactor Vessel Water Level Signal of Indeterminate origin.HPCS-1 Card Replaced ‎ (← links)
  • 05000461/LER-1992-002, :on 920227,automatic Reactor Scram Occurred Due to Low RPV Water Level.Caused by Mfg Deficiencies & Inadequate Maint Procedures.Vendor Manual & Maint Procedures CPS 8211.03 & CPS 8211.05 Will Be Revised ‎ (← links)
  • 05000461/LER-1992-006, :on 920425,containment & Drywell Instrument Air Sys Isolation Valves Closed Unexpectedly.Caused by Design of Instrument Air Isolation Logic.Mod to Change Logic Will Be Evaluated ‎ (← links)
  • 05000461/LER-1995-008, :on 951110,design Program Deficiency Identified Resulting in Potentially Erroneous Indication & Inoperable DW Floor Drain Sump Monitoring Sys.Programmable Logic Controller Ladder Logic Revised ‎ (← links)
  • 05000461/LER-1996-001, :on 960110,isolation of Mechanical Vacuum Pumps on Main Steam Line High Radiation Signal Occurred.Caused by Lack of Clarity of Meaning of Note in Table 3.3.2-1. Procedure Revised ‎ (← links)
  • 05000461/LER-1992-005, :on 920320,failure to Maintain Containment Instrument Air Isolation Valve Operable Occurred Per TS 3/4.6.4.Caused by Inadequate Procedure.Tech Spec Requirements Reviewed & Revised ‎ (← links)
  • 05000461/LER-1991-007, :on 911212,B RWCU HX Room Air Handling Unit Fan Failed,Resulting in Inoperable Leak Detection Instruments.Cause Under Investigation.B RWCU HX Room Air Handling Unit Reworked ‎ (← links)
  • 05000461/LER-1990-017, :on 901206,RHR Sys Not Bypassed During Performance of HX B Room Differential Temp Channel Calibr. Caused by Procedural Errors.Individuals Counseled ‎ (← links)
  • 05000461/LER-1990-016, :on 901129,radiation Protection Technician Discovered Secondary Containment Access to RHR HX a Room Breached During Mode 5.Cause Undetermined.Personnel Told Not to Impair Access to Protected Area ‎ (← links)
  • 05000461/LER-1995-006, :on 950801,lack of Appropriate Post Maint Testing Due to Personnel Errors Resulted in Inoperable Reactor Recirculation Flow Control Valve.Replaced Components Removed During Maint Work ‎ (← links)
  • 05000461/LER-1992-001, :on 920104,failure of B Phase Main Power Transformer Led to Turbine Generator Trip & Reactor Scram. Caused by Internal Fault Leading to Transformer Replacement ‎ (← links)
  • 05000461/LER-1991-008, :on 911222,FCV Operated Erratically Due to Failure of Reactor Recirculation Valve B Position Feedback. Loop Velocity & Position Transducers Replaced & Calibr on Both a & B Reactors ‎ (← links)
  • 05000461/LER-1992-004, :on 920311,unplanned Actuation of Group 11 Containment Isolation Valves Occurred.Caused by Failure to Prepare Sys Impact Matrix as Required by Administrative Procedure.Maint Procedure Revised ‎ (← links)
  • 05000461/LER-1992-003, :on 920304,discovered That Leakage Rate Through Reactor Feedwater Header Check Valve in Excess of Test Instrument Range.Caused by Valve Mfg Tolerances & Alignment.Valves Will Be Rebuilt ‎ (← links)
  • 05000461/LER-1991-006, :on 911116,waterbox Isolation W/Degraded Condenser Performance & Inadequate Steam Jet Air Ejector Suction Alignment Caused Decreased Condenser Vacuum Resulting in Manual Scram ‎ (← links)
  • 05000461/LER-1990-003, :on 900212,13 Rosemount Transmitters Determined to Be Inoperable Due to Loose Covers & Broken Neck Seal. Completed Two Performances of PM Task to Verify Housing Cover Torque & Neck Seal Integrity ‎ (← links)
  • 05000461/LER-1990-003-01, Forwards LER 90-003-01 Re 13 Rosemount Transmitters Being Inoperable Due to Loose Housing Covers & Broken Neck Seal. LER Revised to Update Info Provided,Including Licensee Contact,C/A & Maint Work Document Numbers ‎ (← links)
  • 05000461/LER-1995-005, :on 950515,RRPs Tripped from Fast to Slow Speed Due to Fault in Reactor Recirculation Control Panel +/- 15 Volt Dc Field Bus Bars.Nest Assembly Which Contained Faulty Field Bus Bars Replaced W/Spare Nest Assembly ‎ (← links)
  • 05000461/LER-1995-002, :on 950314,LLRT Failures of FW Containment Isolation Valves Resulted in Total Leakage Rates Greater That TS & 10CF50,App J Limits.Valves Opened & Inspected & Elastomeric Soft Valve Seats on Listed Valves Replaced ‎ (← links)
  • 05000461/LER-1995-002-01, Forwards LER 95-002-01 Re LLRT Failures of FW Containment Isolation Valves Which Resulted in Total Leakage Rates Greater than TS & 10CFR50,App J Limits.Rept Revised to Identify C/A,Safety Significance & Previous Similar Even ‎ (← links)
  • 05000461/LER-1995-004, :on 950427,personnel Error During Plant Startup Resulted in Increased RP Above 150 Psig Prior to Rcics Being Operable.Shift Supervisor Discussed Event W/Lass & Emphasized Attention to Detail ‎ (← links)
  • 05000461/LER-1995-003, :on 950323,lack of Appropriate PMT Due to Personnel Error Resulted in Inoperable Secondary Containment Bypass Leakage Path Isolation Valve During Reactor Core Alterations.Performed Appropriate PMT ‎ (← links)
  • 05000461/LER-1991-004, :on 910819,reactor Core Isolation Cooling Sys Isolation Occurred.Caused by Rosemount Transmitter Failure. Failed Transmitter Replaced & post-maint Testing Satisfactorily Completed ‎ (← links)
  • 05000461/LER-1995-001, :on 950105,FW Heater Train Operation During Removal of FW Heater from Svc Was Not Understood & Resulted in Decreased FW Temp,Loss of Heater Level Control & Manual Scram.Plugged 5B FW Heater Tubes ‎ (← links)
  • 05000461/LER-1994-009, :on 941220,operator Failed to Initiate Operability of Offsite Ac Power Sources within One H After Declaring Div 3 EDG Inoperable Due to Oversight.Event Reviewed & Findings Discussed ‎ (← links)
  • 05000461/LER-1994-008, :on 940417,identified That Reactor Recirculation Pump Discharge Valves Outside Seismic Design Bases Due to Loose Yoke Connections.Cause Unknown.Loctite Applied to Threads of Studs/Nuts ‎ (← links)
  • 05000461/LER-1990-004-02, Forwards LER 90-004-02 Re Potential Inability of Safety Related air-operated Valves & 10CFR21 Defect Rept 21-90-05 Re Overpressurization Failure of safety-related Air Operated Valves.W/O 10CFR21 Rept ‎ (← links)
  • 05000461/LER-1994-007, :on 940808,identified That Section 8.3 of Surveillance Test CPS 9031.14 Not Completed Prior to Entry Into Startup Mode Due to Inattention to Detail.Section 8.3 of Surveillance Test CPS 9031.14 Completed ‎ (← links)
  • 05000461/LER-1994-006, :on 940607,emergency DG Was Not Loaded to at Least 3869 Kw as Required by TS During Tests.Caused by Personnel Error.Replaced Optical Isolator Power Supply & Calibrated Optical Isolator Loop ‎ (← links)
  • 05000461/LER-1994-003, :on 940415,reactor Thermal Power Level Exceeded 100 Percent of Rate Thermal Power Due to Unexpected Reactor Recirculation System Flow Control Transient.Corrective Action:Replaced Solenoid & Controller Module ‎ (← links)
  • 05000461/LER-1991-002, :on 910218,loss of Svc & Instrument Air Occurred Resulting in Manual Scram Insertion.Caused by Personnel Error.Surge Suppression Switch on Compressor Recalibrated ‎ (← links)
  • 05000461/LER-1991-003, :on 910220,jarring of Division III Diesel Generator Breaker Cubicle Door by Utility Maint Personnel Results in Automatic Start of Diesel Generator.Caused by Personnel Error.Preventive Maint Developed ‎ (← links)
  • 05000461/LER-1991-016, :on 901129,secondary Containment Access to RHR a HX Room Breached.Caused by Lack of Knowledge of Requirements for Secondary Containment Integrity & Controlled Boundary Doors.Personnel Counseled ‎ (← links)
  • 05000461/LER-1994-005, :on 940408,while Reviewing Calculations,Concern Was Raised About Setpoints for Undervoltage Relay.Caused by Initial Design Error.Operator Has Received Training on second-level Undervoltage Scheme ‎ (← links)
  • 05000461/LER-1994-004, :on 940413,during Lass Absence,No SRO Was in MCR & Requirements of TS 6.2.2.b Not Met.Caused by Untimely Action by Lass.Corrective Action:Counseling Lass & Discussing Event W/Senior Reactor Operators ‎ (← links)
  • 05000461/LER-1994-002, :on 940201,MSIV Leakage Control Sys Dilution Air Flow Transmitter Making Transmitter Inoperable.Caused by Personnel Error.Instrument Valves for Transmitter 1E32-NO59 Labled & All Labling for Valves Enhanced ‎ (← links)
  • 05000461/LER-1994-001, :on 940115,unexpected Automatic Isolation of RCIC Sys Occurred During Channel Calibr Surveillance Due to Lifting Wrong Thermocouple Lead.Labels That Are More Visible Installed to Thermocouple Terminal Strips ‎ (← links)
  • 05000461/LER-1993-007, :on 931220,discovered Incorrectly Positioned Steam Flow Control Valve Due to Operators Lack of Understanding of Design of Valves Controller Results in Saturated Ogs.Revised Sys Operating Procedure ‎ (← links)
  • 05000461/LER-1993-008, :on 931230,determined That TS SR for Setpoint Verification of APRMs flow-biased Simulated Thermal power- High RPS Trip Functions Not Completed within Specified Interval Due to Personnel Errors ‎ (← links)
  • 05000461/LER-1990-015, ;on 900816,inadvertent Shorting of Circuit Card Edge Connectors Occurred During Card Removal.Shorting Caused Isolation Signal & Half Scram.Caused by Personnel Error. Technician Counseled ‎ (← links)
  • 05000461/LER-1993-002, :on 930930,blown Fuse Due to Degraded Components within Inverter.Replaced Inverter Capacitors ‎ (← links)
  • 05000461/LER-1993-006, :on 931206,manual Scram Occurred Due to Decreasing Reactor Water Level.Caused by High Rotor Thrust Trip of Only Available Reactor Feedwater Pump.Procedures Revised ‎ (← links)
  • 05000461/LER-1990-014, :on 900712,determined That Tech Spec Surveillance 4.8.1.1.1.a Not Performed within 1 H After Diesel Generator Declared Inoperable.Caused by Operator Error.No Specific Corrective Action Required ‎ (← links)
  • 05000461/LER-1990-013, :on 900709,main Generator Overvoltage/Hertz Protection Relay 59/81-1 Actuated,Then Main Turbine Generator Tripped.Cause Cannot Be Determined.Relays Recalibr & Setpoints of Sample of Relays Verified ‎ (← links)
  • 05000461/LER-1993-003, :on 931113,reactor Scram,Containment Isolation & Loss of Shutdown Cooling Occurred When Transmitter Simulator Inadvertently Bumped During RPS Lsft.Appropriate Personnel Will Receive Briefing ‎ (← links)
  • 05000461/LER-1993-005, :on 930929,actuator Assemblies on Outboard Valves Failed to Seat Valve Disc.Caused by Deficient Mfg Design.C/A:Initiating Design Change to Fabricate & Install Proper Actuator Assembly Parts ‎ (← links)
  • 05000461/LER-1993-004, :on 931002,failure of Shutdown Svc Water Sys Pump to Automatically Restart During Edg/Eccs Testing Occurred.Caused by Tight Timing Tolerance in Sequencing of Electrical Contacts in Breaker Logic ‎ (← links)
  • 05000461/LER-1990-010, :on 900508,emergency Diesel Generators Declared Inoperable Due to Joints in Shutdown Svc Water Sys Piping for HXs Not Having Required tie-rods Installed.Caused by Intallation Error.Stress Analysis Performed ‎ (← links)
  • 05000461/LER-1990-012, :on 900517,feedwater Sys Flow Channel Failed & Caused Sensed Low Feedwater Flow.Caused by Normal end-of- Life Failure for Converter.Power Converter Replaced & Preventive Maint Tasks Established ‎ (← links)
  • 05000461/LER-1990-011, :on 900514,during Routine Testing,Diesel Generators 1A Tripped on High Coolant Temp.Caused by Lack of Procedures for Correctly Positioning Diesel Generator SX Throttle Valves.Caution Tags Replaced ‎ (← links)
  • 05000461/LER-1990-009, :on 900427,discovered That Moving Filter Paper in Leak Detection Sys Drywell Air Particulate Sample Panel Not Collecting on take-up Reel.Caused by Loose Set Screw on Gear Train.Set Screw Tightened ‎ (← links)
  • 05000461/LER-1990-008, :on 900408,attempt Made for 14 Control Rod Withdrawals While Main Turbine Bypass Valves Were Open & Reactor Power Was Greater than Low Power Setpoint.Caused by Personnel Error.Reactor Shut Down ‎ (← links)
  • 05000461/LER-1990-007, :on 900331,inadequate Determination of Equipment Status Resulted in de-energization of Nuclear Sys Protection Sys.Caused by Personnel Error.Fact Sheet on Operation Issued & Personnel Retrained ‎ (← links)
  • 05000461/LER-1990-006, :on 900321,process Radiation Monitor Placed in Svc W/O Required Filter Due to Inadequately Specified Job Steps for Plant Mod.Caused by Personnel Error.Procedure 1502.01 to Be Revised ‎ (← links)
  • 05000461/LER-1990-005, :on 900322,containment Penetration Identified to Have motor-operated Valve W/Inadequate Actuator on Inboard Isolation Valve.Caused by Failure to Consider Design Capabilities of Actuators.Actuators Reworked ‎ (← links)
  • 05000461/LER-1989-037, :on 891129,inboard Drywell post-LOCA Vacuum Relief Valve Failed to Indicate Fully Open During Valve Stroke Testing.Caused by Worn O-rings Allowing Air to Leak Around Solenoid piston.O-rings Replaced.W/Undated Ltr ‎ (← links)
  • 05000461/LER-1993-001-01, :on 930226,requirements of TS 3.3.7.5 Were Not Met Due to Vendor Failure to Design Flywheel & Unexplained Capped Constant Bleed Drain on Air Tank Resulting in High Compressor Current.Labels Installed.W/Undated Ltr ‎ (← links)
  • 05000461/LER-1990-002, :on 900124,inappropriate Acceptance Criteria Used in pre-operational Test of Shutdown Svc Water Sys.Cause Under Investigation.Flow Condition of Components Measured ‎ (← links)
  • 05000461/LER-2019-004-01, Safety Relief Valve Wiring Issue Results in Condition Prohibited by Technical Specifications ‎ (← links)
  • 05000461/LER-1991-001, :on 910121,automatic Closure of Inboard MSIV 1B21-F022 A,B,C & D & Inboard Main Steam Drain Line Isolation Valve 1B21-F016 Occurred.Caused by Personnel Error.Maint Work Request Mwr D09786 Revised ‎ (← links)
  • 05000461/LER-1990-001, :on 900212,drywell Purge Sys Containment Penetration Failed Local Leak Rate Test.Caused by Failure to Remove Cosmolene from Surface of Valve Prior to Initial Installation.Valves Replaced ‎ (← links)
  • 05000461/LER-1989-038, :on 891212,discovered That Only 2 of 4 Cable Conductors for Div II Nuclear Sys Protection Sys Power Supply Connected.Caused by Design Drawing Deficiency.Power Supply Configurations Reviewed ‎ (← links)
  • 05000461/LER-1989-039, :on 891212,operations Shift Supervisor Notified That Three HPCS Suction Valves Not Tested within Max Surveillance Time Interval.Caused by Personnel Error. Surveillance Procedure Revised ‎ (← links)
  • 05000461/LER-1989-040, :on 891206,discovered That Mode Limitations from Surveillance Procedure Omitted,Resulting in Inoperable ATWS Recirculation Pump Trip Sys Instrumentation.Caused by Inadequate Procedure.Surveillance Revised ‎ (← links)
  • 05000461/LER-1989-042, :on 891219,false RCIC Div I Steam Line Differential Pressure High Signal Caused RCIC Turbine Steam Supply Isolation Valve to Shut & RCIC Sys to Trip.Caused by Sensor Design Error.Field Alteration Begun ‎ (← links)
  • 05000461/LER-1989-041, :on 891122,unit Entered Tech Spec 3.0.3 When RCIC & HPCS Sys Inoperable Simultaneously for 37 Minutes. Chiller Condensing Unit Tripped Due to Low Refrigerant Pressure.Refrigerant in Chiller Recharged ‎ (← links)
  • 05000461/LER-1989-035, :on 891129,during Channel Functional Test of ECCS Drywell Pressure Channel,Operator Selected Wrong Channel for Testing,Causing Isolation of Instrument Air Sys. Caused by Personnel Error.Briefing Conducted ‎ (← links)
  • 05000461/LER-2019-004, Safety Relief Valve Wiring Issue Results in Condition Prohibited by Technical Specifications ‎ (← links)
  • 05000461/LER-2019-003, Reactor Water Cleanup System Differential Flow Instrumentation Inoperable ‎ (← links)
  • 05000461/LER-1989-036, :on 891113,incorrect Connection of Source to Terminals Directly Below Correct Terminals Caused Div 1 Isolation of RCIC Sys.Caused by Personnel Error.Personnel Briefed on Need to Use Ladders/Stools ‎ (← links)
  • 05000461/LER-1989-034, :on 891004,discovered That Inservice Station HVAC Exhaust Stack Process Radiation Monitor Had Not Been Verified as Operable,Contrary to Tech Spec 3.3.7.12.Caused by Lack of Training & Inadequate Communication ‎ (← links)
  • 05000461/LER-2019-001-01, Main Feed Breaker Failed to Close During Bus Shift ‎ (← links)
  • 05000461/LER-2019-002, For Clinton Power Station, Unit 1, Turbine Driven Reactor Feed Pump Hydraulic Control Failure Results in Automatic Scram ‎ (← links)
  • 05000461/LER-2019-001, Main Feed Breaker Failed to Close During Bus Shift ‎ (← links)
  • 05000461/LER-2018-005-02, Unplanned Reactor Scram During Maintenance Outage Due to High Intermediate Range Monitor Flux ‎ (← links)
  • 05000461/LER-2018-005-01, Unplanned Reactor Scram During Maintenance Outage Due to High Intermediate Range Monitor Flux ‎ (← links)
  • 05000461/LER-2018-003-01, Load Driver Card Failure Resulting in High Pressure Core Spray Inoperability ‎ (← links)
  • 05000461/LER-2018-005, Unplanned Reactor Scram During Maintenance Outage Due to High Intermediate Range Monitor Flux ‎ (← links)
  • 05000461/LER-2018-004, Undervoltage Condition Caused by an Offsite Ameren Transformer Bushing Failure Initiates an Automatic Start of an Emergency Diesel Generator ‎ (← links)
  • 05000461/LER-2018-003, Load Driver Card Failure Resulting in High Pressure Core Spray Lnoperability ‎ (← links)
  • 05000461/LER-2018-002, Division 2 Diesel Generator Inoperability Due to Air Receiver Remaining Isolated Following Clearance Removal Resulting in Unplanned Shutdown Risk Change ‎ (← links)
  • 05000461/LER-2018-001, Degraded Personnel Airlock Interlock Results in Loss of Primary Containment ‎ (← links)
  • 05000461/LER-1917-010, Regarding Division 1 Transformer Failure Leads to Instrument Air Isolation to Containment Requiring a Manual Reactor Scram ‎ (← links)
  • 05000461/LER-1917-009, Regarding Trip of Emergency Reserve Auxiliary Transformer Static Var Compensator Causes Positive Secondary Containment Pressure Following Voltage Transient on 138 Kv Offsite Source ‎ (← links)
  • 05000461/LER-1917-008, Re Division 3 Shutdown Service Water Pump Start Failure ‎ (← links)
  • 05000461/LER-1917-007, Re Manual Reactor Scram Due to Loss of Feedwater Heating ‎ (← links)
  • 05000461/LER-1917-006, Re Secondary Containment Inoperable During Mode Change Due to Doors Propped Open ‎ (← links)
  • 05000461/LER-1917-005, Regarding Automatic Reactor Scram During the Performance of Scram Time Testing as a Result of an Invalid Oscillating Power Range Monitor Growth Rate Trip ‎ (← links)
  • 05000461/LER-1917-004, For Clinton Power Station, Unit 1 Main Steam Isolation Valve Local Leak Rate Test Limit Exceeded During Refueling Outage ‎ (← links)
  • 05000461/LER-1917-003, Regarding Implementation of Enforcement Guidance Memorandum (Egm) 11-003, Revision 3 ‎ (← links)
  • 05000461/LER-1917-002, Regarding Failure of the Division 1 Diesel Generator Ventilation Fan Load Sequence Relay Circuit During Concurrent Maintenance of RHR Division 2 Results in an Unanalyzed Condition ‎ (← links)
  • 05000461/LER-2017-001, Regarding Failure of the 138 Kv Offsite Power Source Results in a Loss of Secondary Containment Vacuum ‎ (← links)
  • 05000461/LER-2016-010, Regarding Failure to Complete Technical Specification Required Actions within the Completion Time Resulted in a Condition Prohibited by Technical Specifications ‎ (← links)
  • 05000461/LER-2015-004-01, Regardomg Trip of Emergency Reserve Auxiliary Transformer Static Var Compensator Causes Positive Secondary Containment Pressure Following Lightning Strike on 138 Kv Offsite Source ‎ (← links)
  • 05000461/LER-2016-009, Regarding Trip of Fuel Building Fans Due to Damper Failure Results in Loss of Secondary Containment ‎ (← links)
  • 05000461/LER-2016-008, Regarding Implementation of Enforcement Guidance Memorandum (EGM) 11-003, Revision 3 ‎ (← links)
  • 05000461/LER-2016-007, Regarding Main Steam Line Flexible Hose Lntergranular Stress Corrosion Cracking Identified During Refueling Outage ‎ (← links)
  • 05000461/LER-2016-006, Missed Surveillance Results in a Condition Prohibited by Technical Specifications ‎ (← links)
  • 05000461/LER-2016-005, Regarding Insulator Failure on the Reserve Auxiliary Transformer Results in a Loss of Secondary Containment Vacuum ‎ (← links)
  • 05000461/LER-2016-004, Regarding Trip of Emergency Reserve Auxiliary Transformer Static Var Compensator Causes Positive Secondary Containment Pressure Following Lightning Strike on 138 Kv Offsite Source ‎ (← links)
  • 05000461/LER-2016-003, Regarding Bypassing Both Divisions of Reactor Water Cleanup Leak Detection System Is a Reportable Loss of Safety Function ‎ (← links)
  • 05000461/LER-2016-002, Regarding Trip of Fuel Building Ventilation Exhaust Fan Due to Moisture Formation Resulting in the Loss of Secondary Containment Vacuum ‎ (← links)
  • 05000461/LER-2016-001, Regarding Continuous Containment Purge Exhaust Fan Trip Due to Invalidated Assumptions in Work Planning Resulted in an Unanalyzed Condition of Primary to Secondary Containment Differential Pressure & Safety ‎ (← links)
  • 05000461/LER-2015-005, Regarding Containment Ventilation Radiation Monitors Inoperable During Operations with the Potential for Draining the Reactor Vessel Activities ‎ (← links)
  • 05000461/LER-2014-005-01, 1 for Clinton, Unit 1, Regarding Failure of Shutdown Service Water Pump Results in Loss of Division 3 Emergency Diesel Generator and High Pressure Core Spray Safety Functions ‎ (← links)
  • 05000461/LER-2015-004, Regarding Trip of Emergency Reserve Auxiliary Transformer Static Var Compensator Causes Positive Secondary Containment Pressure Following Lightning Strike on 138 Kv Offsite Source ‎ (← links)
  • 05000461/LER-2015-003, Regarding Condition Prohibited by Technical Specification 3.9.4 for Failing to Disarm Control Rod Drive Prior to Fuel Moves in Modes 5 with One Control Rod Position Indication Channel Inoperable ‎ (← links)
  • 05000461/LER-2015-001, Regarding Division 1 and Division 2 Reactor Water Cleanup System High Differential Flow Instruments Become Incapable of Performing Their Safety Function ‎ (← links)
  • 05000461/LER-2014-005, Failure of Shutdown Service Water Pump Results in Loss of Division 3 Emergency Diesel Generator and High Pressure Core Spray Safety Functions ‎ (← links)
  • 05000461/LER-2014-003, Regarding Misapplication of Support System Technical Specification Requirements Resulted in Implementation of Non-Conservative Guidance for Removal of Essential Switchgear Heat Removal System from Service ‎ (← links)
  • 05000461/LER-2013-009, Regarding Software Errors in New Digital Feedwater Control System Result in Manual Reactor Scram Due to Approaching High Reactor Pressure Vessel Water Level Setpoint ‎ (← links)
  • 05000461/LER-2014-002, Regarding Lowering Condenser Vacuum Due to B Train Steam Jet Air Ejector Instability Results in Manual Reactor Scram ‎ (← links)
  • 05000461/LER-2014-001, Regarding Premature Failure of Air Supply Solenoid Results in Isolation of Fuel Building Ventilation System and Loss of Secondary Containment Differential Pressure ‎ (← links)
  • 05000461/LER-2013-008, Regarding Failure of Division I Transformer Leads to Isolation of Instrument Air Supply to Containment, Lowering Scram Pilot Air Header Pressure, and Manual Reactor Scram ‎ (← links)
  • 05000461/LER-2013-007, Regarding Failed to Enter Tech Spec Action for Exceeding Reactor Coolant Heatup Rate ‎ (← links)
  • 05000461/LER-2013-006, Implementation of Enforcement Guidance Memorandum (EGM) 11-003, Revision 1 ‎ (← links)
  • 05000461/LER-2013-005, Regarding Safe Shutdown Analysis Noncompliance for Diesel Generator Room Ventilation ‎ (← links)
  • 05000461/LER-2013-004, Regarding Loss of Emergency Diesel Room Ventilation Due to Damper Hydramotor Failure ‎ (← links)
  • 05000461/LER-2013-003, Regarding Manual Reactor Scram Due to Main Electro-Hydraulic Control System Failure ‎ (← links)
  • 05000461/LER-2013-002, Deficient Fuse Causes Main Generator Trip, Turbine Trip and Reactor Scram ‎ (← links)
  • 05000461/LER-2013-001, Inadequate Risk Identification Results in Loss of Safety Function ‎ (← links)
  • 05000461/LER-2012-003, Regarding Breaker Failure Leads to Loss of Safety Function and System Start ‎ (← links)
  • 05000461/LER-2012-002, Regarding Division 1 Emergency Diesel Generator Supply Air Damper Failure ‎ (← links)
  • 05000461/LER-2012-001, Regarding Loss of Secondary Containment Differential Pressure Due to Transformer Trip ‎ (← links)
  • 05000461/LER-2011-009, Regarding Missed Surveillance Due to Preconditioning Valve Prior to Leak Rate Test ‎ (← links)
  • 05000461/LER-2011-007, Regarding Unfused DC Ammeter Circuits Result in Unanalyzed Condition ‎ (← links)
  • 05000461/LER-2011-008, Reactor Protection System Actuation and Loss of Shutdown Cooling ‎ (← links)
  • 05000461/LER-2011-005, Regarding Missed Surveillance Due to Preconditioning Valve Prior to Leak Rate Test ‎ (← links)
  • 05000461/LER-2011-006, Regarding Condition Prohibited by Technical Specifications Due to Failed Missed Surveillance ‎ (← links)
  • 05000461/LER-2011-004, Regarding Automatic Reactor Scram During Removal of Main Generator ‎ (← links)
  • 05000461/LER-2011-003, Regarding Inadequate Procedure Direction Results in Missed Response Time Testing ‎ (← links)
  • 05000461/LER-2011-002, Regarding Main Control Room HVAC Return Fan B High Vibrations ‎ (← links)
  • 05000461/LER-2011-001, Regarding Postulated Spurious High Pressure Core Spray Initiation Result Unanalyzed ‎ (← links)
  • 05000461/LER-2010-003-01, For Clinton Power Station, Unit 1, Regarding Unexpected Component Actuations Due to Self Test System Design Deficiencies ‎ (← links)
  • 05000461/LER-2010-004, For Clinton Power Station, Unit 1, Regarding OPDRV Requirements Not Met During Control Rod Drive Mechanism Replacements ‎ (← links)
  • 05000461/LER-2008-003, For Clinton Power Station Unit 1, Regarding Excessive Leakage Through Feedwater Isolation Valve 1B21F032A ‎ (← links)
  • 05000461/LER-2010-002, Excessive Leakage Through Feedwater Isolation Valve 1B21-F032B ‎ (← links)
  • 05000461/LER-2010-001, For Clinton, Unit 1, Regarding Unanalyzed Leakage Pathway Affection Residual Heat Removal a Pump Room Flooding Analysis ‎ (← links)
  • 05000461/LER-2009-005, Regarding Manual Scram on High Water Level Due to Reactor Recirculation Pump Trip ‎ (← links)
  • 05000461/LER-2009-003, Re Safety Function Loss Due to No Like for Like Verification of Swapped Relays ‎ (← links)
  • 05000461/LER-2009-004, Regarding Steam Leak Due to Valve Packing Torque, Resulting in Required Plant Shutdown ‎ (← links)
  • 05000461/LER-2009-002, Contractor Falsified Information for Unescorted Access Authorization ‎ (← links)
  • 05000461/LER-2009-001, Regarding Safety Function Lost Due to Capacitor Failure on Circuit Card ‎ (← links)
  • 05000461/LER-2008-002, For Clinton, Unit 1, Regarding Uncontrolled Safeguards Information Due to Failure to Institutionalize Good Practices ‎ (← links)
  • 05000461/LER-2008-001, Regarding Automatic Scram on High RPV Water Level Due to Reactor Pump Trip ‎ (← links)
  • 05000461/LER-2007-003, IGSCC Causes Pressure Boundary Leak and Reactor Shutdown ‎ (← links)
  • 05000461/LER-2007-002, Regarding Improper Installation of Stanchions in Containment Pool Swell Zone ‎ (← links)
  • 05000461/LER-2007-001, Regarding Inadequate Consideration of Vortexing in Design Calculations ‎ (← links)
  • 05000461/LER-2006-004, From Clinton Regarding Inadequate Configuration Control Risk Assessment Causes Loss of Safety Function ‎ (← links)
  • 05000461/LER-2006-003, Regarding High Reactor Water Level Scram Result of Bad Inverter Circuit Board Solder Joint ‎ (← links)
  • 05000461/LER-2006-002, Re Main Turbine Bypass System Safety Function Lost Due to Circuit Card Failure ‎ (← links)
  • 05000461/LER-2006-001, Regarding Failure to Tighten Terminal Screw Causes Turbine/Generator Trip and Reactor Scram ‎ (← links)
  • 05000461/LER-2005-001, Regarding Inadequate Procurement Specification for Charcoal Results in Inoperable Control Room Ventilation Subsystem ‎ (← links)
  • 05000461/LER-2004-005, Regarding Automatic Start of Division 2 Shutdown Service Water Pump Due to Unknown Cause ‎ (← links)
  • 05000461/LER-2004-006, Regarding Small Amount of Special Nuclear Material in Unirradiated Nuclear Instrument Detectors Unaccounted for ‎ (← links)
  • 05000461/LER-2004-004, Reactor Scram While Placing Residual Heat Removal B Into Shutdown Cooling ‎ (← links)
  • 05000461/LER-2004-003, Regarding Main Power Transformer Protective Relaying System Design and Lightning Cause Scram ‎ (← links)
  • 05000461/LER-2004-002, Re Mispositioned Standby Liquid Control Air Spare Valve Results in High Boron Concentration ‎ (← links)
  • 05000461/LER-2004-001, Generator Neutral Over-Voltage / Lockout Leads to Reactor Scram ‎ (← links)
  • 05000461/LER-2003-003, Regarding Reactor Scram Due to Loss of Power to 480 Volt Unit Substation 1I ‎ (← links)
  • 05000461/LER-2003-002, From Clinton, Unit 1 Regarding Manual Reactor Scram Due to Main Turbine Vibrations Caused by Deficient Procedure Guidance ‎ (← links)
  • 05000461/LER-2003-001, Human Performance Errors Result in Inoperable Containment Isolation Valve & Failure to Isolate Penetration within 4 Hours ‎ (← links)
  • 05000461/LER-2002-003, Re Manufacturing Process Deficiency in Main Power Transformer Sudden Pressure Relay Causes False Actuation of Relay Resulting in Generator & Turbine Trip & Reactor Scram ‎ (← links)
  • 05000461/LER-2002-002, Inadequate Preventive Maintenance Program for the Feedwater System Results in Lockup of a Turbine-Driven Reactor Feed Pump and Scram on High Reactor Pressure Vessel Water Level During Extended Power Uprate Testing ‎ (← links)
  • 05000461/LER-2023-001, Grid Fault Results in Switchyard Breaker Trips and Reactor Scram ‎ (← links)
  • 05000461/LER-1998-003, :on 980213,loss of Nuclear Sys Protection Sys Bus Resulted in Inadvertent Isolation of Shutdown Cooling. Cause Is Unknown.Corrective Actions Not Yet Determined ‎ (← links)
• ML13122A260 (redirect page) ‎ (← links)
• 05000461/LER-2013-009, Regarding Software Errors in New Digital Feedwater Control System Result in Manual Reactor Scram Due to Approaching High Reactor Pressure Vessel Water Level Setpoint ‎ (← links)
• 05000461/LER-2013-008, Regarding Failure of Division I Transformer Leads to Isolation of Instrument Air Supply to Containment, Lowering Scram Pilot Air Header Pressure, and Manual Reactor Scram ‎ (← links)
• 05000461/LER-2013-007, Regarding Failed to Enter Tech Spec Action for Exceeding Reactor Coolant Heatup Rate ‎ (← links)
• 05000461/LER-2013-006, Implementation of Enforcement Guidance Memorandum (EGM) 11-003, Revision 1 ‎ (← links)
• 05000461/LER-2013-005, Regarding Safe Shutdown Analysis Noncompliance for Diesel Generator Room Ventilation ‎ (← links)
• 05000461/LER-2013-004, Regarding Loss of Emergency Diesel Room Ventilation Due to Damper Hydramotor Failure ‎ (← links)
• 05000461/LER-2013-003, Regarding Manual Reactor Scram Due to Main Electro-Hydraulic Control System Failure ‎ (← links)
• 05000461/LER-2013-002, Deficient Fuse Causes Main Generator Trip, Turbine Trip and Reactor Scram ‎ (← links)