Pages that link to "05000456/LER-2025-001, Over Temperature Delta Temperature Due to Lightning Strike"

The following pages link to 05000456/LER-2025-001, Over Temperature Delta Temperature Due to Lightning Strike:

Displayed 3 items.

• ML25269A165 (redirect page) ‎ (← links)
  • ML25269A163 ‎ (← links)
• 05000456/LER-2025-001 (redirect page) ‎ (← links)
  • 05000456/LER-2016-003 ‎ (← links)
  • 05000456/LER-2007-003 ‎ (← links)
  • 05000456/LER-1993-007, Resubmits LER 93-007-00 to Correct Incorrect Date on Transmittal Cover Ltr ‎ (← links)
  • 05000456/LER-1998-003, Forwards LER 98-003-00 from Braidwood Generating Station,Iaw 10CFR50.73(a)(2)(iv).Listed Commitments Made in LER ‎ (← links)
  • 05000456/LER-1998-004, Forwards LER 98-004-00 IAW 10CFR50.73(a)(2)(I)(B). Commitments Made by Util,Listed ‎ (← links)
  • 05000456/LER-1999-001, Forwards LER 99-001-00,IAW 10CFR50.73(a)(2)(i)(B). Description of Action & Associated Action Request Number That Braidwood Station Is Committed to Implement Is Response to LER Is Listed ‎ (← links)
  • 05000456/LER-1998-005, Forwards LER 98-005-00 Per 10CFR50.73(a)(2)(i)(B).Commitment Made by Util,Listed ‎ (← links)
  • 05000456/LER-1998-007, Forwards LER 98-007-00,IAW 10CFR50.73(a)(2)(v).Commitments Made Listed ‎ (← links)
  • 05000456/LER-1998-006, Forwards LER 98-006-00 IAW 10CFR50.73(a)(2)(i)(B),which Requires 30 Day Rept.Ler Commitments Listed ‎ (← links)
  • 05000456/LER-1988-012, Advises That LER 88-012-00 Withdrawn.Investigation Revealed That Operator Did Indicate That Room Temps Less than Tech Spec Limits ‎ (← links)
  • 05000456/LER-1986-009, Informs of Typo in LER 86-009-00 Re Issuance of Suppl to Ler.No Suppl Will Be Issued ‎ (← links)
  • 05000456/LER-2024-001, Trip on Low Steam Generator Level Ddue to Failure to Verify Isolation Valves Were Open ‎ (← links)
  • 05000456/LER-2022-001, Liquid Penetrant Indications in Control Rod Drive Mechanism Nozzle Seal Weld Repair Due to Subsurface Weld Defects Opening Up from Thermal and Pressure Stresses During Operation ‎ (← links)
  • 05000456/LER-2021-002, Unit Trip on Generator Load Rejection Due to Lightning Strike within the Unit Switchyard Exceeding the Capabilities of the Switchyard Grounding System ‎ (← links)
  • 05000456/LER-2021-001, Train a and B Source Range Neutron Flux Trip Functions Bypassed During Plant Startup ‎ (← links)
  • 05000456/LER-2020-001, Train a Auxiliary Feedwater Pump Was Inoperable Due to a Failed Suction Pressure Lead/Lag Card ‎ (← links)
  • 05000456/LER-1989-008-09, :on 890905,Sargent & Lundy Engineers Evaluation Determined That W/Uncorrected Setpoints,Allowable Tech Spec Value Would Have Been Exceeded.Caused by Unclear Design Documents.Analysis of Setpoints Performed ‎ (← links)
  • 05000456/LER-1989-004-04, :on 890306,auxiliary Feedwater Pumps Started Automatically Following Closure of Governor Valves.Caused by Defective Test Switch.Stable Plant Conditions Established. Temporary Procedure Changes Initiated ‎ (← links)
  • 05000456/LER-1989-009-05, :on 890902,failure of Main Steamline Safety Valve to Reseat Occurred.Caused by Preservice Error in Design of Valve.Vendor Recommended Upgrade Will Be Installed on Valve 1MSO17C.Remaining Valves Checked ‎ (← links)
  • 05000456/LER-1989-003-05, :on 890302,control Room Ventilation Actuations Due to Momentary Loss of Voltage to Radiation Monitors. Caused by Perturbation of 345 Kv Sys.Evaluation Performed on Area & Process Radiation Monitors ‎ (← links)
  • 05000456/LER-1989-005-06, :on 890422,instrument Inverter 111 Tripped & Repair Not Completed within 24 H Per Tech Spec.Caused by Shorted Capacitor Due to Normal Wear.Instrument Bus Energized & Inverter Repaired ‎ (← links)
  • 05000456/LER-1989-007-08, :on 890810,containment Bldg Fuel Handling Incident Area Radiation Monitor Went Into Alert Alarm & Interlock Actuation Due to Loss of Pulses.Caused by Failed High Voltage Power Supply in Monitor ‎ (← links)
  • 05000456/LER-1989-001, :on 890206,reactor Trip Occurred Due to Spurious Loss of Output Voltage on Instrument Inverter 112. Cause of Momentary Loss of Inverter Under Investigation. Feedwater Isolation Signal Reset ‎ (← links)
  • 05000456/LER-1989-002-09, :on 890416,main Steam Line Low Pressure Reactor Trip,Safety Injection & Main Steam Isolation Occurred.Caused by RCS Pressure Above 1,1930 Psig & Main Steam Pressure Less than 640 Psig.Heatup Procedure Will Be Revised ‎ (← links)
  • 05000456/LER-1989-006-09, :on 890718,lightning-induced Voltage Transients Experienced,Resulting in Actuation of Multiple Rod Drive Overvoltage Protection Devices.Caused by Inadequate Lightning Protection.Protectors Reset ‎ (← links)
  • 05000456/LER-1988-002-04, :on 880125,reactor Trip & Safety Injection Generated During Performance of Instrument Surveillance Analog Operational Test & Channel Verification/Calibr.Caused by Personnel Error.Test Rept Revised ‎ (← links)
  • 05000456/LER-1988-021-01, :on 880926,verified That Monthly Target Axial Flux Surveillance Not Performed.Caused by Personnel Error & Lack of Administrative Controls.Reduced Power to Less than 90% & Calculated New Target Values for Delta I ‎ (← links)
  • 05000456/LER-1987-057, :on 871009,as Throttle Valve 2 Being Cycled, MW Output Became Erratic Resulting in Reactor Trip.Root Cause Indeterminate.Temporary Instrumentation Installed on Sensing Line of Turbine Impulse Transmitter ‎ (← links)
  • 05000456/LER-1987-043, :on 870810,discovered That Iodine Isotopic Analysis Required by Tech Specs Missed on 870809.Caused by Miscommunication Between Nonlicensed Chemist & Licensed Operator.Sampling Requirement Matrices Written ‎ (← links)
  • 05000456/LER-1987-042, :on 870809,main Control Room Ventilation ESF Actuation Signal Occurred.Caused by Warm,Humid Air Condensing in Sample Lines.Water Removed,Filter Changed, Monitor & Intake Duct Inspected & Sys Reset ‎ (← links)
  • 05000456/LER-1987-041, :on 870808,licensed Control Room Operator Recognized That Surveillance for Tech Spec 4.2.1.1.b Not Performed When Unit at or Above 15 % Reactor Power.Caused by Programmatic Deficiency ‎ (← links)
  • 05000456/LER-1987-044, :on 870808,RHR Valve 1RH8716A Closed for 64 Minutes.Caused by Inadequate Reviews of Tech Specs 3.5.2 & Violation of Procedure Bwop RH-5.Control Switches for Crosstie Valve Tagged W/Caution Cards ‎ (← links)
  • 05000456/LER-1987-038, :on 870716,control Room Ventilation Shifted to Emergency Makeup Mode as Result of Noise Spike on Associated Radiation Monitor.Noise Spike Caused by Transistor Failure in Particulate Channel High Voltage Power Sys ‎ (← links)
  • 05000456/LER-1987-039, :on 870717,diesel Generator 1B Load Fluctuations Occurred.Caused by Intermittent Failure of Std Load Sensor Module.Module Replaced ‎ (← links)
  • 05000456/LER-1987-037, :on 870715,channel Checks Not Performed for Containment Hydrogen Monitor 1HSU-PS346 During Shifts 2 & 3. Caused by Personnel Error.Channel Check Performed & Containment Air Sample Found within Limits ‎ (← links)
  • 05000456/LER-1987-040, :on 870724,failure to Perform Normal & Alternate Offsite AC Power Availability Surveillance Occurred.Caused by Operating Dept Lack of Attention to Detail & Communication.Personnel Counseled ‎ (← links)
  • 05000456/LER-1998-002-08, :on 980719,discovered That No SRO Was in Cr. Caused by Personnel Error.Counseled Unit 1 Supervisor & Reinforced Operating Mgts Expectations Re Performance of Turnovers W/All Operating Crews ‎ (← links)
  • 05000456/LER-1996-010-01, :on 960821,noted Failure to Comply W/Design Basis.Caused by Degradation of Boraflex in Spent Fuel Racks. Implemented Controls on SFP Boron Concentration & Silica Concentration ‎ (← links)
  • 05000456/LER-1987-059, :on 870905,surveillance Missed Due to Lost Data Sheet.Caused by Disassembly of Daily Operating Surveillance Package for Data Collection.Search for Sheet Conducted & Surveillance Restructured ‎ (← links)
  • 05000456/LER-1987-058, :on 871106,both Trains of Control Room Ventilation Inoperable Due to Incorrect Design.Caused by Preservice Testing Deficiency.Temporary Alteration Processed to Correct Heater Interlock Logic Deficiency ‎ (← links)
  • 05000456/LER-1987-031, :on 870613 & 1016,discovered That Main Control Room Annunication of Control Room Ventilation Sys Train Oa Shifted to Emergency Makeup Mode of Operation.Caused by Inadvertent Radio Operation ‎ (← links)
  • 05000456/LER-1987-054, :on 871021,27 & 29,calorimetric Calculations Performed Outside Time Allowed by Tech Specs Due to Inconstant Reactor Power.Caused by Booster Pump Strainer Clogging.Addl Guidance & Controls Initiated ‎ (← links)
  • 05000456/LER-1987-035, :on 870705,reactor Trip from Rod Control Sys Motor Generator Set Trip Occurred.Caused by Miscommunication Between Personnel.Two Resistors,Varistor & Diode Replaced. Use of Procedure Bwop RD-5 Ensured ‎ (← links)
  • 05000456/LER-1987-056, :on 871009,main Control Room Outside Air Intake Radiation Monitor Gas Channel Processed Spurious High Radiation Signal to ESF Causing Recirculation Charcoal to Realign Ventilation Dampers to Emergency Mode ‎ (← links)
  • 05000456/LER-1987-024, :on 870522 & 27,fuse for Primary Power Supply to Card Frame 2 Blew Resulting in Reactor Trip Signal.Caused by Designed Fuse Size in Card Frame 2,cabinet 1PA01J.Fuse Replaced & Reactor Trip Cleared ‎ (← links)
  • 05000456/LER-1987-034, :on 870704,grab Sample Analysis,Taken Due to Inoperability of Radiation Monitor,Not Completed on Time. Caused by Insufficient Data Storage Room in Computer.Addl Disc Drives Will Be Activated ‎ (← links)
  • 05000456/LER-1987-036, :on 870704,discovered That Circulation Water Blowdown Line Composite Sample Unavailable & Compositor Switch in Wrong Position.Caused by Inadequate Procedure.New Procedure Written & Switch Reset ‎ (← links)
  • 05000456/LER-1987-033, :on 870702,control Room Ventilation Return & Makeup Fans Tripped During Monthly Surveillance Test.Caused by Inadvertent Power Shutoff to Dampers by Nonlicensed Personnel.Fans Restarted ‎ (← links)
  • 05000456/LER-1987-025, :on 870606,inadvertent Opening of MSIV Occurred During Maint Activities.Caused by Deficiency in Maint Procedure.Event Will Be Reviewed W/Mechanical & Instruments Maint Crew.Procedure Revised ‎ (← links)
  • 05000456/LER-1987-047, :on 870928,discovered That Required Surveillance for Diesel Generator 1A Not Performed & Diesel Declared Inoperable.Caused by Personnel Error. Surveillance Completed & Diesel Found Operable ‎ (← links)
  • 05000456/LER-1987-055, :on 870927,28 & 1002,Train B Containment Ventilation Isolation Signal Annunciated in Main Control Room.Caused by Defective Detector.Monitors Plastic Covering Rearranged & Temporary Warning Signs Posted ‎ (← links)
  • 05000456/LER-1987-032, :on 870629 & 0630,rod Control Urgent Alarm Received.On 870701,reactor Manually Tripped Per Tech Spec 3/4.1.3.1.Caused by Loose Connections & Blown Fuses in Switch Cabinet.Ampere Fuses Replaced ‎ (← links)
  • 05000456/LER-1987-052, :on 870924,main Transformer Overexcitation Relay Actuated During Synchronizing Main Generator to Sys Grid.Root Cause Unknown.Investigation Revealed Loose Connection on Contact Block.Block Replaced ‎ (← links)
  • 05000456/LER-1987-050, :on 870923,reactor Tripped Due to Personnel Reinstalling Handle on Transformer Deluge Alarm Test Valve. Caused by Personnel Unintentionally Turning Valve Stem Approx Five Degrees.Personnel Counseled ‎ (← links)
  • 05000456/LER-1987-053, :on 870924,containment Fuel Handling Incident Area Radiation Monitor Experienced Loss of Power.Exact Cause Unknown & Believed to Be Const in Area.Containment Isolation Signal Reset ‎ (← links)
  • 05000456/LER-1987-051, :on 870923 & 24 Control Room Train B Ventilation Sys Shifted to Emergency Makeup Mode Due to Spurious Spike on Control Room Outside Air Intake Gas Channel ORE-PRO33B.Cause Unknown ‎ (← links)
  • 05000456/LER-1989-001-07, :on 890206,momentary Loss of Output Voltage on Instrument Inverter 112 Caused Reactor Trip Signal Due to Intermediate Range High Flux Bistable from Channel N36 Reverting to ESF Safe Configuration ‎ (← links)
  • 05000456/LER-1987-029, :on 870617,discovered That Instrumentation Slave Relay Surveillance Pressure Interlock Missed on 861215.Caused by Procedural Deficiency.Procedure to Be Revised ‎ (← links)
  • 05000456/LER-1987-046, :on 870910,RCS Cooldown Rate Increase Led to lo-lo Steam Generator (SG) Level & auto-start of Auxiliary Feedwater Pump 1B.Caused by Procedural Deficiency.Sg Level Will Be Monitored When Cooldown Rate Changes ‎ (← links)
  • 05000456/LER-1987-045, :on 870908,process Computer Rebooted,Causing Axial Flux Difference Monitor Alarm to Be Inoperable.Caused by Failure of Engineer to Realize That Rebooting Renders Computer Inoperable.Surveillance Initiated ‎ (← links)
  • 05000456/LER-1987-049, :on 870905,isotopic Analysis of Waste Gas Oxygen Analyzer Performed Rather than Required Oxygen Concentration.Caused by Programmatic Deficiency.Training Program Being Developed ‎ (← links)
  • 05000456/LER-1987-030, :on 870608,containment Fuel Incident Area Radiation Monitor Initiated Primary Containment Ventilation Isolation.Caused by Shorted Fuse Holder.Power Restored to Monitor & Light Bulb Replaced W/Fuseless Model ‎ (← links)
  • 05000456/LER-1987-027-01, :on 870606,reactor Trip First Out Annunciation Occurred Due to Source Range Channel N31 High Flux.Caused by Procedural Deficiency.Reactor Trip Signal Reset & Temporary Procedure Change Initiated ‎ (← links)
  • 05000456/LER-1987-028, :on 870601,Tech Spec Violation Occurred When Surveillance Activities Halted to Investigate Problem on Drawer.Caused by Cognitive Personnel Error.Personnel Counseled ‎ (← links)
  • 05000456/LER-1987-060, :on 871206,reactor Manually Tripped.Caused by Blockage of Condensate/Condensate Booster Pump Suction Strainers.Walkdown of Condensate Sys Performed to Look for Piping/Hanger Damage ‎ (← links)
  • 05000456/LER-1997-009, :on 971028,potential Failure of W Fuel Rod Design Criteria Discovered by W.Caused by Use of Inadequate Methods & Incorrect Assumptions in Fuel Rod Design Code.W Completed plant-specific Analyses on 980306 ‎ (← links)
  • 05000456/LER-1998-001-07, :on 980205,failed to Test ESF Logic Circuit Due to Oversight by Personnel Reviewing TS for Surveillance Requirements Prior to start-up of Either Unit.Effectiveness of CAs Will Be Evaluated ‎ (← links)
  • 05000456/LER-1987-026, :on 870507,discovered Failure to Obtain Final Approval Signature for Temporary Procedure Changes 852 & 469 within 14 Days.Caused by Personnel Error.Procedure for Logging Procedure Changes Being Revised ‎ (← links)
  • 05000456/LER-1987-018, :on 870315,Train B Containment Isolation Signal Annunciated in Control Room.Caused by weather-related Perturbation on 345-kV Transmission Sys.Event Considered Spurious.No Action Deemed Necessary ‎ (← links)
  • 05000456/LER-1986-002-09, :on 861117,Tech Spec Action Requirement 3.3.1 Not Met While Both Source Range Channels Inoperable.Caused by Personnel Not Verifying Listed Closed & Secured Valves. Personnel Verified 1CV8435 Locked Closed ‎ (← links)
  • 05000456/LER-1987-016-01, :on 870504,essential Svc Water Sys Surveillance Not Completed within Required Frequency Due to Inadequate Administrative Procedure.Procedure Revised to Add Separate Checkoffs for Complete & Partial Surveillances ‎ (← links)
  • 05000456/LER-1986-001-10, :on 861021,22 & 1101,continuous Fire Watches Interrupted.Caused by Inattentive Employee,When Employee Ordered to Leave Post by Security & When Employees Evacuated Following Bomb Threat,Repectively ‎ (← links)
  • 05000456/LER-1987-023, :on 870418,shift Engineer Reviewing LERs Noted That Shift Personnel Incorrectly Permitted Valve Packing Adjustments to Two Containment Isolation Valves.Caused by Programmatic Flaws in Processing Packages ‎ (← links)
  • 05000456/LER-1986-011-02, :on 861224,containment Ventilation Isolation Signal Received from Train B of Solid State Protection Sys. Caused by Spurious Signal Due to Multiple Work Activities by Contractor Personnel.Ltr to Contractor Issued ‎ (← links)
  • 05000456/LER-1987-013, :on 870218,during Rod Position Testing,Shutdown Bank a Control Rods Became Misaligned Due to Misstepping of CRD Mechanism.Caused by Procedure Inadequacies.Feedwater Isolation Signal Reset ‎ (← links)
  • 05000456/LER-1986-011-09, :on 861224,containment Ventilation Isolation Signal Received from Train B of Solid State Protection Sys. Caused by Const Activites Taking Place Simultaneously.Signal Manually Reset ‎ (← links)
  • 05000456/LER-1987-008, :on 870129,reactor Tripped Due to Deenergization of Nuclear Instrumentation Sys as Protective Measure Against Water Intrusion Into Control Room.Caused by Plugged Drain.Drain Cleared & Flushed ‎ (← links)
  • 05000456/LER-1986-006-09, :on 861204,Action Statement 3.3.3.10 Re Failure of Auxiliary Bldg Effluent Radiation Monitor 1RT-PR028 Not Being Followed.Caused by Personnel Cognitive Error.Personnel Counseled ‎ (← links)
  • 05000456/LER-1986-007-09, :on 861204,during QA Audit,Temporary Procedure Change 556 Discovered to Have Been Used & Canceled W/O Onsite Review Authorization.Caused by Unclear Procedures. Surveillance Results Reviewed ‎ (← links)
  • 05000456/LER-1986-004-08, :on 861128,reactor Trip Occurred as Result of Steam Generator 1B & 1C lo-lo Level.Caused by Misadjusted Demineralizer Backwash Outlet Valve OWX505A.Valve Adjusted to Allow Proper Closure ‎ (← links)
  • 05000456/LER-1986-005-10, :on 861203 Radiation Monitor 1RT-AR012 Actuated on High Alert Alarm,Resulting in ESF Actuation of Primary Containment Isolation Valves.Caused by Voltage Transient/ Noise Spike Due to Const.Personnel Counseled ‎ (← links)
  • 05000456/LER-1987-007-01, :on 870130,audit of Tech Specs Noted That Reactor Trip Breakers Shunt & Under Voltage Trip Independence Test Surveillances for Trains a & B Not Performed.Caused by Contractor Error ‎ (← links)
  • 05000456/LER-1987-006-01, :on 870120,hourly Fire Watch Patrols Not Performed in Essential Svc Water Pump Room.Caused by Failure of Personnel to Recognize That Path Had Been Left to Complete Patrol.Personnel Reinstructed ‎ (← links)
  • 05000456/LER-1987-011, :on 870121,while Preparing to Drain Component Cooling Water Shellside of Hx,Rhr Lost Svc.Caused by Leaking Component Cooling Inlet Isolation Valve.Leaking Valve Repaired & Surge Tank Refilled ‎ (← links)
  • 05000456/LER-1987-005, :on 870115,reactor Manually Tripped Due to Confusing Rod Position Indications.Caused by Incorrect Field Wiring of Digital Rod Position Indication Cables & Failure to Reset Rod Control Urgent Failure Alarm ‎ (← links)
  • 05000456/LER-1987-004, :on 870108,Train a Containment Ventilation Isolation Occurred.Caused by Operator Inadvertently Tripping ESF Bus 131X2.Operator Involved in Formal Review & Appropriate Action Taken Based on Work Record ‎ (← links)
  • 05000456/LER-1987-002-01, :on 870107,ESF Bus 141 Feed Breaker Tripped Resulting in Loss of Power to Radiation Monitor Causing Containment Ventilation Isolation for Train A.Caused by Const Activity.Ltr Issued to Const Mgt ‎ (← links)
  • 05000456/LER-1987-022, :on 870331,turbine Trip/Reactor Trip Signal Occurred.Caused by Operator Failure to Follow Procedure. Permissive Test Switch Returned to Off Position & Personnel Instructed to Pay Attention to Details ‎ (← links)
  • 05000456/LER-1987-003, :on 870107 & 09,containment Bldg Fuel Handling Incident Area Radiation Monitor Channel 1RE-AR012 (Il) Went Into High Alert Alarm & Interlock Actuation Due to Loss of Pulses.Detector Replaced ‎ (← links)
  • 05000456/LER-1986-001-01, :on 861021-1202,inoperable Fire Suppression Sys Led to Imposition of Continuous Fire Watch.Incidents of Inattentiveness,Confusion,Or Miscommunication Among Fire Watch Patrolmen Led to Dismissal or Retraining ‎ (← links)
  • 05000456/LER-1987-021, :on 870330,reactor Trip Signal Generated W/O Component Actuation.Caused by Contractor Repairs to Connection in Solid State Protection Sys While Channel Not Isolated.Procedures Will Be Revised ‎ (← links)
  • 05000456/LER-1987-001, :on 870102,personnel Failed to Take Required Gas Sample w/H2 & O2 Analyzers Inoperable.Caused by Design Deficiency in Moisture Separator Filter.Filter Placed in Sample Gas Inlet Line to Remove Water ‎ (← links)
  • 05000456/LER-1987-010, :on 870209,output Breaker to Inverter Feeding Instrument Bus 111 Inadvertantly Tripped.Caused by Personnel Error Due to Contractors Working in Area.Electrical Lineup to Bus Verified & Const Personnel Instructed ‎ (← links)
  • 05000456/LER-1987-009, :on 870207,reactor Tripped When Control Power Fuses on Source Range N32 Pulled During Troubleshooting. Caused by Personnel Error.Operator Aid Sheet Re Trip Signals Generated by Pulling Fuses Will Be Created ‎ (← links)
  • 05000456/LER-1986-009-08, :on 861218,engineering Dept Informed That Emergency Diesel Generator Should Be Declared Inoperable Due to 10CFR21 Rept from Cooper Energy Svcs.Caused by Improper Circuit Design & Unqualified Switches ‎ (← links)
  • 05000456/LER-1986-010, :on 861218,source Range Level Trip on Channel N31 Occurred.Caused by Personnel Error During Removal of Fire Retardant Matl from Inside Nuclear Instrumentation Panel.Cable Repaired & Edge of Strut Rounded ‎ (← links)
  • 05000456/LER-1986-008-09, :on 861209 & 12,closure of Reactor Trip Breakers in Conjunction W/Inoperability of Channel N31 for More than 48 H,In Noncompliance W/Tech Specs,Discovered. Caused by Personnel Error.Personnel Counseled ‎ (← links)
  • 05000456/LER-1988-019-01, :on 880801,Train a & B Control Room Ventilation Automatically Shifted to Emergency wake-up Mode.Caused by Momentary Fluctuation in Line Voltage That Dropped Below 90 Volts.Equipment Operation Returned to Normal ‎ (← links)
  • 05000456/LER-1988-015-03, :on 880710,control Room Recirculation Charcoal Absorber Dampers Repositioned,Placing Charcoal Absorbers in Svc & Annunciating Control Room Recirculation Alarm.Cause Undetermined.Protective Device to Be Installed ‎ (← links)
  • 05000456/LER-1986-003-09, :on 861121,hard Rubber Fire Hoses Declared Inoperable Due to Lack of Valid,Current Hydrostatic Test. Caused by Hose Failure Due to Improper Coupling for Intended Use.Hoses Replaced.Personnel Counseled ‎ (← links)
  • 05000456/LER-1987-019, :on 870319,shiftly Check of Pressurizer Pressure Channels Not Performed.Caused by Procedural Error. Temporary Procedure Change 1194 Incorporated,Indicating That Pressurizer Pressure Channels Must Be Checked ‎ (← links)
  • 05000456/LER-1987-020, :on 870312,fire Zone Detection & Suppression Annunciator Capability Failed.Caused by Failure of Bearing in Power Supply Cooling Fan.Fire Watches Established & Panel Power Supply & Cooling Fan Repaired ‎ (← links)
  • 05000456/LER-1987-017, :on 870313,failure to Dual Verify Liquid Radioactive Release Valve Lineup Occurred.Caused by Personnel Error.Personnel Counseled ‎ (← links)
  • 05000456/LER-1988-022-02, :on 881016,reactor Tripped on Reactor Coolant Pump Low Flow Followed by Turbine/Generator Trip.Caused by Potential Transformer Failure on Offsite 138 Kv Line.Subj Potential Transformer Replaced & Line Restored ‎ (← links)
  • 05000456/LER-1987-014, :on 870217 & 23,inner Door of Containment Emergency Personnel Airlock Declared Inoperable.Tech Spec 3.6.1.3.a.1 Exceeded on 870224.Caused by Misinterpretation, Defective Testing Procedure & Improper Seal ‎ (← links)
  • 05000456/LER-1987-015, :on 870224,observed Rod N9 in Shutdown Bank B Misstepping During Withdrawal Causing Turbine Trip & Feedwater Isolation.Cause of Misalignment Unknown.Reactor Trip Caused by Deficient Procedure ‎ (← links)
  • 05000456/LER-1987-012, :on 870217,discovered That Fire Detection Zone 1D-8 Inoperable Since 870213.Caused by Unauthorized Removal of Detector Due to Personnel Error.Detection Zone Repaired. Personnel Counseled ‎ (← links)
  • 05000456/LER-1997-010-07, :on 971114,discovered That Ssps Testing Was Inadequate.Caused by Original Testing Design Flaw.Added New Testing Criteria to Ssps bi-monthly Surveillance Procedures & Successfully Tested Ssps ‎ (← links)
  • 05000456/LER-1997-009-07, :on 971028,potential Failure of W Fuel Rod Design Criteria Discovered.Caused by W Use of Inadequate Methods & Incorrect Assumptions in Fuel Rod Design Code.W Developed Plan to Resolve Fuel Rod Issue ‎ (← links)
  • 05000456/LER-1997-007-05, :on 971027,excessive Operator Response Times Were Noted.Caused by Inadequate Analysis Implementation. BwEP-3 Was Revised to Suspend Transition to BwFR-P.1 During Depressurization Portion of BwEP-3 ‎ (← links)
  • 05000456/LER-1997-008-06, :on 971010,determined That Projected SG leak- Rate Combined W/Ts Limit for Dose Equivalent Iodine Creates Potential for Operation Outside Design Basis.Caused by Density Correction.Sgs Replaced ‎ (← links)
  • 05000456/LER-1998-007-06, :on 981118,non-conservative Error Detected in Vendor Analysis Code Resulted in Bdps Being Determined Inoperable.Caused by Personnel Error.C/As Will Be Performed as Necessary Under Westinghouse Corrective Action Program ‎ (← links)
  • 05000456/LER-1998-006-05, :on 981117,failure to Test Contacts as Required by TS Identified.Caused by Inadequate Surveillance Procedure Development Prior to Initial Plant start-up.Appropriate Limiting Condition Entered ‎ (← links)
  • 05000456/LER-1990-018-03, :on 900929 & 30,spurious Train B Solid State Protection Sys Actuations Occurred Due to Component Failure ‎ (← links)
  • 05000456/LER-1988-005-01, :on 880204,diesel Generator 1A Start on Safety Injection Signal Instead of Undervoltage Signal.Caused by Miscommunication Between Operators.Generator Secured & Operators Counseled ‎ (← links)
  • 05000456/LER-1998-004-02, :on 980903,MSSVs Were Tested in Excess of Required Setpoint.Caused by Suspected Metallic Bonding. Evaluated Disc Removed from One of Valves & Reviewed Historical Data to Assess Cause of Test Failures ‎ (← links)
  • 05000456/LER-1998-004-01, Forwards LER 98-004-01,IAW 10CFR50.73(a)(2)(i)(B). LER 98-004 Included Commitment to Transmit Supplemental Rept by 990628,due to on-going Evaluations ‎ (← links)
  • 05000456/LER-1988-024-04, :on 881031,operator Noted That Hydraulic Pump on 1A MSIV Pumping Continuously.Caused by Failure of M1 Four Way Valve.Nuclear Work Request A26531 Written to Replace Defective Four Way Hydraulic Valve M1 ‎ (← links)
  • 05000456/LER-1999-001-06, :on 990516,both Trains of LPSI Were Declared Inoperable.Caused by Leakage of SI Accumulator Water.Design Changes Were Implemented to Install Local High Point Vents in Common Portion of Rh Sys Piping to 1B & 1C RCS ‎ (← links)
  • 05000456/LER-1998-005-08, :on 981004,noted That make-up Fan 0VC03CA Failed to Start.Caused by Apparent MCC Motor Starter Malfunction.Motor Starter Was Replaced on 981015 ‎ (← links)
  • 05000456/LER-1988-020-02, :on 880916,control Room Train B Ventilation Automatically Switched to Makeup Mode Due to High Radiation Signal.Cause Unknown.Pressure Transducer Replaced ‎ (← links)
  • 05000456/LER-1988-003-02, :on 880113,fuel Handling Bldg Incident Monitor ORT-AR056 Went Into Alarm Condition Due to Loss of Pulses. Cause Not Known.Detector Cable Slackness Not Considered to Have Caused Loss of Pulses.Monitor Replaced ‎ (← links)
  • 05000456/LER-1988-011, :on 880415,0503 & 0506,high Radiation Signals Processed by Control Room Train B Radiation Monitor Caused Control Room Ventilation Sys to Shift to Emergency Makeup Mode.Caused by Noisy Switch.Monitor Reset ‎ (← links)
  • 05000456/LER-1998-003-07, :on 980906,loss of Offsite Power Event Was Experienced Due to Electrical Fault.Caused by Matl Dislodged by High Winds.Maint Contract Specifications Will Be Revised to Establish Requirements for Housekeeping ‎ (← links)
  • 05000456/LER-1988-011-01, :on 880415,0503 & 06,control Room Ventilation Sys (VC) Shifted to Emergency Makeup Mode Due to Spurious Monitor Spike.Cause Not Determined.Monitor Reset & VC Returned to Normal.Electrocubes Installed ‎ (← links)
  • 05000456/LER-1998-004-06, :on 980903,MSSVs Tested in Excess of Required Setpoint.Caused by Metallic Bonding Between Disc & Nozzle Seats.Valves Were Adjusted as Necessary & Retested for Placement Into Accepted Tolerance Range Prior to LCO Exit ‎ (← links)
  • 05000456/LER-1988-010, :on 880410,control Room Ventilation Sys Automatically Shifted to Emergency Makeup Mode of Operation. Caused by Mgt Deficiency.Setpoint Corrected to Proper Value ‎ (← links)
  • 05000456/LER-1988-009, :on 880407,discovered That on 880316,using Work Traveler,Control Room Chiller Temp Controller Incorrectly Determinated.Caused by Planning Error by Contractor Mgt. Control Room Chiller Reterminated ‎ (← links)
  • 05000456/LER-1988-016-06, :on 880811,reactor Tripped Due to Improper Administrative Controls.Caused by Cognitive Personnel Error. Stable Plant Condition Established Following Reactor Trip.W/ ‎ (← links)
  • 05000456/LER-1988-018-02, :on 880722,discovered That Surveillance Requirement for Essential Svc Water Isolation Valves Not Performed After Containment Chiller Returned to Svc on 880521.Caused by Procedural Deficiency ‎ (← links)
  • 05000456/LER-1988-017-03, :on 880721,two Tech Spec Composite Samples Not Included in Program.Caused by Misinterpretation of Amended Tech Spec Requirements by non-licensed Chemist.Correct Interpretation of Tech Specs Verified ‎ (← links)
  • 05000456/LER-1988-008, :on 880325 & 27,operators Noted Decreasing Vol Control Tank Level Causing Increased make-up.Caused by Improperly Locked Closed Valve Inadvertently Bumped Off Closed Seat.Valve Repaired & Reinstalled ‎ (← links)
  • 05000456/LER-1988-014-04, :on 880702,determined That 40 Sequencing Timer for Containment Spray Had Not Been Tested within Tech Spec Time Requirements.Caused by Procedural Deficiency. Procedure Will Be Revised ‎ (← links)
  • 05000456/LER-1988-012-05, :on 880611,room Temps for Safety Injection & Centrifugal Charging Pump 1B Not Taken & Contaminated Spill Occurred in Areas of Room.Caused by Personnel Error. Personnel Counseled & Procedure Revised ‎ (← links)
  • 05000456/LER-1988-006-01, :on 880313,partial Loss of Auxiliary Bldg Nonaccessible Filter Plenum Position Indication Occurred. Caused by Adminstrative & Mgt Deficiency.Event Reviewed W/Individuals Involved & Reviewed W/Personnel ‎ (← links)
  • 05000456/LER-1988-013-01, :on 880609,station Chemist Informed That Four Release Tank Samples Missing.Caused by Programmatic Deficiency.Samples Will Be Kept in Locked Storage Cabinet ‎ (← links)
  • 05000456/LER-1988-002-03, :on 880125,reactor Trip Signal & Safety Injection Occurred.Caused by Personnel Error.Injection Terminated,Running Equipment Secured & Loop 396 Restored to Original Configuration ‎ (← links)
  • 05000456/LER-1988-003, :on 880113,fuel Handling Bldg Incident Monitor ORT-AR056 Went Into Alarm Condition Due to Loss of Pulses. Cause Unknown.Detector Cable Tightened.Further Insp of Monitor Planned ‎ (← links)
  • 05000456/LER-1997-004-07, :on 970523,missed TS Surveillance Occurred Due to a Clerical Error.Caused by Skill Based Typo by Data Entry Clerk.Effectiveness Review Will Be Performed ‎ (← links)
  • 05000456/LER-1997-006-05, :on 970522,TS 3.0.3 Was Entered & Unit 1 Cooled Down Due to ECCS Venting Issue.Caused by Mgt Deficiency. Weekly Ultrasonic Exams of Piping Will Be Performed Until TS Is Changed ‎ (← links)
  • 05000456/LER-1997-003-06, :on 970524,manually Opened Reactor Trip Occurred Due to Improper Rod Bank Overlap.Caused by Failure of Thumbwheel Switches Due to Dirty Contacts.Stopped Rod Motion,Cleaned Contacts & Revised Procedure ‎ (← links)
  • 05000456/LER-1988-007, :on 870215,unit Entered Mode 4,on 880218,pumps 1B,2A & 2B Declared Inoperable Due to Discovery That Lower Motor Bearing Vibration Readings for RHR Not Current.Caused by Programmatic Deficiency ‎ (← links)
  • 05000456/LER-1987-061, :on 871224,PORV & PORV Block Valve Stroke Test Surveillance Overdue.Caused by Overly Restrictive Procedural Requirements.Surveillance Procedures Will Be Revised ‎ (← links)
  • 05000456/LER-1997-002-07, :on 970421,Unit 1 SGs Declared Category C-3,per TS Table 4.4.2,during A1R06 Refuel Outage.Caused by Mfg Process of hard-rolling SG Tubes Into Tubesheet.Repairable Indications Identified During Insp Repaired ‎ (← links)
  • 05000456/LER-1997-001-09, :on 970417,declared Both Main Control Room Chillers Inoperable Due to Equipment Failure.Will Overhaul Valve Actuator,Will Replace Motor & Will Perform Insp of 0SX063A Valve ‎ (← links)
  • 05000456/LER-1996-012-06, :on 961024,Unit 1 SG Declared Category C-3 Per TS 4.4.5.2.e During A1P02 Midcycle Outage.Cause Related to Mfg Process of hard-rolling SG Tubes Into Tubesheet.All Defective Tubes Were Repaired by Sleeving ‎ (← links)
  • 05000456/LER-1996-013-06, :on 961205,area Radiation Monitor Setpoints Were Incorrect.Caused by Personnel Error Due to Inadequate Work Practices & Inattention to Detail.Effectiveness Review of These CAs Will Be Performed ‎ (← links)
  • 05000456/LER-1996-011-05, :on 960924,identified Mgt Deficiencies Leading to Not Testing Installation of roll-up Fire Door Mod in Timely Manner,Resulting in Unanalyzed Condition.Doors Closed & Secured ‎ (← links)
  • 05000456/LER-1993-001, :on 930107,RC Pump Underfrequency Quarterly Surveillance Experienced Trip,Due to Single Failure of Logic Card in B-Train Ssps.Failed Universal Card Sent to Vendor for Detailed Failure Analysis ‎ (← links)
  • 05000456/LER-1992-014-07, :on 921204,discovered That Specific Population of Snubbers Installed on nonsafety-related Sys Not Included in Snubber Testing Program.Caused by Personnel Error.Snubbers Added to Insp/Exam Program ‎ (← links)
  • 05000456/LER-1992-010-06, :on 920814,dual Accounting for Samarium to Boron Value Contained in Curvebook Table 1-1 Re Min Required Boron Concentration for Shutdown Margin Occurred.Caused by Procedural Flaw.Procedure Revs Submitted ‎ (← links)
  • 05000456/LER-1996-005-03, :on 960423,identified Operation of Safety Injection Accumulators Outside Design Basis.Caused by Mgt Deficiency.Operating Procedures Revised ‎ (← links)
  • 05000456/LER-1996-009-04, :on 960729,violation of TS Noted Due to Safety Injection Relief Valves Lifting & Failing to Resear.Relief 1SI8853A Replaced ‎ (← links)
  • 05000456/LER-1992-013-06, :on 921023,spurious Safety Injection Signal Occurred.Cause Unknown.Addl Troubleshooting Performed on Train B ‎ (← links)
  • 05000456/LER-1992-012-06, :on 921018,SG Water Levels Raised to Approx 45%,resulting in Leak in Feedwater Check Valve,Allowing Upstream Feedwater Piping to Be Filled from Sg.Caused by Feedwater Pump Autostart.Sg Levels Increased ‎ (← links)
  • 05000456/LER-1996-008-06, :on 960710,improper Placement of Spent Fuel Results in TS Violations.Caused by Personnel Error.Personnel Counseled Re Expectations & Procedure Revs ‎ (← links)
  • 05000456/LER-1992-011-06, :on 921007,inadequate Testing Frequency for Afp Start on RCP Bus Undervoltage.Caused by Procedural Deficiency.Instrument Slave Relay Surveillances Increased from Quarterly to Monthly Per TS 4.3.2.1 ‎ (← links)
  • 05000456/LER-1996-007-04, :on 960617,improper Placement of Spent Fuel. Caused by Personnel Error & Procedural and Mgt Deficiencies. Repositioned Fuel in Inappropiate Configuration & Counseled Personnel Involved ‎ (← links)
  • 05000456/LER-1995-013, :on 960604,determined Fire Protection Discrepancies.Caused by Inadequate Evaluations.Continued Hourly Fire Watches & Initiated Plant Modifications ‎ (← links)
  • 05000456/LER-1996-006-05, :on 960603,failed to Maintain TS Requirement of 0.25 H2O Differential Pressure Between Auxiliary Bldg & Atmosphere Due to Inadequate Controls Process.Throttled Auxiliary to Turbine Bldg Fire Door ‎ (← links)
  • 05000456/LER-1992-006-06, :on 920701,discovered Two non-conservative Assumptions in Safety Analysis for Bdps.Caused by Inadequate Safety Analysis & Subsequent Review for Bdps.Special Operating Order Revised ‎ (← links)
  • 05000456/LER-1996-010-05, :on 960821,discovered Boraflex Shrinkage & Gaps.Caused by Deterioration as Result of Improper Material Selection.Implemented Controls on Spent Fuel Pool Boron Concentration & Silica Concentration ‎ (← links)
  • 05000456/LER-1996-004-03, :on 960321,discovered Procedure Verifies Water Flow Rate Between 68 to 74 Gpm Based on CR Flow Indication. Caused by Procedural Deficiency.Appropriate Surveillance Corrected ‎ (← links)
  • 05000456/LER-1995-014-05, :on 951019,DG Output Breaker Would Not Close Due to Equipment Failure.Equipment Operators Instructed in Addl Indication to Ensure Breakers Fully Racked in ‎ (← links)
  • 05000456/LER-1992-009, :on 921001,identified That Undervoltage Relay Contacts Untested Due to Procedural Deficiency.Special Procedures Written & Satisfactorily Performed to Demonstrate Operability of Untested Contacts ‎ (← links)
  • 05000456/LER-1992-009-06, :on 920812,1A & 2A DGs Declared Inoperable Due Procedural Deficiency.Special Test Procedures 92-047,048,049 & 050 Written & Performed.Abb Impell safety-related Surveillance Review Project Ongoing ‎ (← links)
  • 05000456/LER-1996-003-03, :on 960308,Battery 112 Declared Inoperable Forcing Unit 1 Sd.Caused by Equipment Degradation Due to Successive Significant Discharges.Testing Performed to Verify Degraded Capacity & Battery Replaced ‎ (← links)
  • 05000456/LER-1996-001-03, :on 960130,missed TS Required Diesel Oil Sample Due to Personnel Error & Procedure Deficiency.Retrained Personnel & Revised Procedure ‎ (← links)
  • 05000456/LER-1996-002-01, :on 960129,operability of Both Trains of CR Ventilation Was Lost Due to Personnel Error.Counseled EMD Technician Involved ‎ (← links)
  • 05000456/LER-1992-008-07, :on 920724,notified That Some Equipment Required to Mitigate Consequences of Accident May Not Operate During Degraded Voltage Event Due to Insufficient Degraded Voltage Setpoint Calculation ‎ (← links)
  • 05000456/LER-1992-007-08, :on 920725,fuel Handling Bldg Ventilation Charcoal Booster Fan Automatically Started Due to Spike of Electronics Associated W/Arm OAR055J.Monitor Declared Inoperable,Tested,Observed & Declared Operable ‎ (← links)
  • 05000456/LER-1995-010-05, :on 950828,determined That Inadequate Surveillance Procedure Could Have Led to ECCS Inoperability Due to Personnel Error & Mgt Deficiency.Satisfactorily Completed Operability Determination ‎ (← links)
  • 05000456/LER-1995-020-03, :on 951223,TS 3.0.3 Was Entered Due to Having Two Inoperable Power Range Detectors.Replaced & Set Power Supply ‎ (← links)
  • 05000456/LER-1995-012-02, :on 951005,method of Makeup to VCT Could Not Be Supported Through Existing Documentation.Caused by Mgt Deficiency.Addl Makeups to VCT Via Boric Acid Storage Tank Provided ‎ (← links)
  • 05000456/LER-1995-019-03, :on 951207,manual Reactor Trip Initiated During Rod Drop Testing Due to Failed Testing Relays.Reactor Trip Breakers Opened ‎ (← links)
  • 05000456/LER-1995-018-04, :on 951207,manual Reactor Trip Inserted During Rod Control Sys Testing Following Failure of Shutdown Rod D-2 to Withdraw on Demand.Fuse Holders Cleaned & Fuses Replaced ‎ (← links)
  • 05000456/LER-1995-017-04, :on 951207,manual Reactor Trip Inserted During Rod Control Sys Testing Following Receipt of Urgent Failure Alarm on S/D Bank E.Suspect Failure Detector Card Replaced in Power Cabinet for S/D Banks C,D & E ‎ (← links)
  • 05000456/LER-1992-005-05, :on 920403,power-range Input to Loop 1A Overtemp Delta Temp Reactor Protection Function Inoperable. Caused by Component Failure.Nuclear Work Request Written to Replace Failed Transmitter ‎ (← links)
  • 05000456/LER-1992-004-05, :on 920325,containment Isolation Valve Closed While Installing Electrical Jumper to Prevent Closure of Chemical Vol Control Sys Letdown Valve.Caused by Placing Jumper in Wrong Terminal.Jumper Removed ‎ (← links)
  • 05000456/LER-1995-016-04, :on 951117,RT Was Inserted During Drpi Operability Testing Due to Blown Stationary Gripper Fuse in Cbb for Rod K-12.Tested Indicator & Fuse FU19 W/Ohmmeter & Found Open ‎ (← links)
  • 05000456/LER-1995-015-06, :on 951024,degradation of SG Tubes Exceeds TS Limit Due to Axial Outside Diameter Stress Corrosion Cracking.Implemented Listed Programs to Mitigate Corrosion Environment in Tube Support Plate Region ‎ (← links)
  • 05000456/LER-1995-014-04, :on 951019,DG Output Breaker Would Not Close Due to Equipment Failure.Fs & EO Performed Visual Check of Other Cubicles on Bus 142 for Any Breakers Not racked-in ‎ (← links)
  • 05000456/LER-1992-003-04, :on 920309,boron Concentration in 1A Safety Accumulator Exceeded TS Limit.Inoperability Declared.Caused by Personnel Error.Requirements Added to Notify Supervisor & to Obtain Sample If TS Limits Exceeded ‎ (← links)
  • 05000456/LER-1995-013-04, :on 951012,fire Protection App R Design Discrepancies Occurred Due to Inadequate Evaluations During Preparation of Original Analysis.Maintained Hourly Fire Watches for All Fire Zones ‎ (← links)
  • 05000456/LER-1995-012-04, :on 951004,mgt Decisions Lead to Positive Reactivity Events,While Shutdown W/Source Range Nuclear Instrument Inoperable Occurred.Caused by Mgt Deficiency. Subsequent Makeups Performed ‎ (← links)
  • 05000456/LER-1995-011-04, :on 951002,B Dilution Prevention Valve Opened W/Unit in Mode 5 & One Source Range Nuclear Instrument Channel Inoperable Due to Inadequate Surveillance Procedure. Closed & re-hanged Temp Lift on 1CV8428 ‎ (← links)
  • 05000456/LER-1995-009-07, :on 950908,control Room Ventilation Missed One Lcoar Due to Personnel Error & Equipment Failure.Counseled Personnel Involved in Event ‎ (← links)
  • 05000456/LER-1995-007-05, :on 950713,testing of DG Voltage Regulator in 1988 Was Inadequate Due to Mgt Deficiency.Developed Procedure Which Verified Performance of Voltage Regulator & Governor Under Transient Loading Conditions ‎ (← links)
  • 05000456/LER-1995-008-05, :on 950818,ECCS Equipment Room Differential Pressure Was Not Maintained Due to Mgt Deficiency & Personnel Error.Revised Barrier Impairment Procedure to Be More Descriptive ‎ (← links)
  • 05000456/LER-1992-001-06, :on 920112,1A Diesel Generator OOS Removed from Svc for Maint W/Ob Hydrogen Recombiner Out of Svc for Insp & Planned Maint Resulting in Tech Spec Violation.Caused by Procedural Deficiency ‎ (← links)
  • 05000456/LER-1995-006-06, :on 950810,missed CR Ventilation 1-h Lcoar Due to Procedural Deficiency & Personnel Error.Unit Supervisor & Shift Engineer Counseled & Info Re Event Disseminated to Operating Dept Personnel ‎ (← links)
  • 05000456/LER-1991-010-06, :on 910929,containment Fuel Handling Incident Area Radiation Monitor Went Into hi-hi Alarm & Interlock Actuation.Caused by Sudden Spiking of Detector.Detector Replaced & Monitor Calibr & Returned to Svc ‎ (← links)
  • 05000456/LER-1992-002-05, :on 920213,OA Hydrogen Recombiner Declared Inoperable When Recombiner Taken Out of Svc for Maint.Caused by Personnel Error & Mgt Deficiency in Work Organization. Recombiner Reassembled & Started ‎ (← links)
  • 05000456/LER-1991-013-07, :on 911114,discovered That Relays Associated W/ 4160 Volt Busses Had Not Been Tested,Potentially Causing DG Inoperability.Caused by Surveillance Procedure Deficiency. Applicable Procedures Revised ‎ (← links)
  • 05000456/LER-1991-012-06, :on 911106,electro-hydraulic Fluid Leak Tripped Feedwater Pump 1B & Steam Generator Levels Decreased Due to Reduction in Total Feedwater Flow.Caused by Crack in Supply Line.Failed Joint Repaired ‎ (← links)
  • 05000456/LER-1991-011-07, :on 911030,inadequate Surveillance Review Resulted in Control Room Ventilation Sys Inoperability. Caused by Personnel Error.Surveillance re-performed Satisfactorily & Sys Declared Operable ‎ (← links)
  • 05000456/LER-1995-005-04, :on 950418,spray Additive Sys Isolated to Both Trains of Cs.Caused by Operator Valving Error.Temporary Procedure Change Initiated ‎ (← links)
  • 05000456/LER-1995-004-05, :on 950409,RT Occurred Due to Failed Capacitor in Firing Card That Caused Loss of Vital AC Instrument Bus 11.Replaced Firing Board in Instrument Inverter W/New One ‎ (← links)
  • 05000456/LER-1991-009-04, :on 910805,gas Decay Tank Sample Not Obtained. Caused by Procedure Deficiency.Alarm Response & Operating Procedures Will Be Revised to Provide More Guidance.W/ ‎ (← links)
  • 05000456/LER-1991-008-05, :on 910729,scaling Deficiency of Over Temp Delta Temp Occurred.Caused by Preservice Design Error. Initial Assessment of Similiar Scaling Deficiencies of Other Reactor Trip Protection Completed ‎ (← links)
  • 05000456/LER-1995-003-05, :on 950302,SG Tube ISI Revealed SGs 1A,1C & 1D as Category C-3.Caused by Axial Odscc.Implemented Programs to Mitigate Corrosive Environ in Tube Support Plate Region That Leads to ODSCC ‎ (← links)
  • 05000456/LER-1995-002-07, :on 950222,insp Revealed That Line Ended W/Open Elbow Directed Into Floor Drain in Unit 1 AF Tunnel.Caused by pre-service Deficiency.Required Check Valves Installed in Unit 1 Drain Line from Unit 1 AF Tunnel ‎ (← links)
  • 05000456/LER-1995-001-05, :on 950118,senior Licensed Operator Was Not Present in MCR Due to Personnel Error.Both Individuals Have Been Spoken to W/Respect to Noncompliance W/Ts Manning Requirements ‎ (← links)
  • 05000456/LER-1990-013, :on 900811,feedwater Isolation Occurred Due to Spurious Actuation of Train B Feedwater Isolation Circuitry. Feedwater Isolation Reset & Flow Reestablished to Steam Generators ‎ (← links)
  • 05000456/LER-1988-001-04, :on 880108,train a Control Room Radiation Monitoring Became Inoperable Due to Noisy Pressure Switches. Corrective Action Included Adding Noise Attenuating Filters to Pressure Switch Circuitry ‎ (← links)
  • 05000456/LER-1991-007-06, :on 910717,rod Control Sys Failure Occurred Causing Shutdown Bank Control Rods to Function Improperly. Caused by Defective Transistor in Firing Circuit Control Card.Cards Replaced ‎ (← links)
  • 05000456/LER-1991-006-04, :on 910427,ESF Actuation Occurred During Surveillance Testing.Caused by Lifted Lead on Undervoltage Relay.Maint Dept & Work Planning Dept Conducted Training ‎ (← links)
  • 05000456/LER-1994-012-03, :on 940811,experienced Inadvertent Main Steam Line Isolation at Power Due to Equipment Failure.Failed A516 Ssps Safeguards Output Driver Circuit Board & A315 Universal Logic Circuit Board Replaced ‎ (← links)
  • 05000456/LER-1991-004-03, :on 910319,relay Block k1 for Monitor ORE-PR001 Improperly Removed During Liquid Release Tank Form Bwop WX-500-1I1 Initiation.Caused by Personnel Error.Form Bwop WX-500-1T1 Will Be Revised ‎ (← links)
  • 05000456/LER-1994-011-04, :on 940803,it Was Noticed That Valves 1CS007A, 1CS007B,2CS007A & 2CS007B Were Not Stroke Time Tested in Closed Direction Prior to Addition to Plant IST Program. Caused by Mgt Deficiency Re Several Factors ‎ (← links)
  • 05000456/LER-1991-003-04, :on 910312,sys Shifted to Emergency Mode of Operation Causing Momentary Loss of Voltage to Control Room Outside Intake Radiation Monitor.Caused by Momentary Fluctuation.Ventilation Sys Restored ‎ (← links)
  • 05000456/LER-1990-010-01, :on 900711,4.16 Kv Breaker Failed to Open Due to Scorched Leads on Closing Coil.Operating Equipment on Bus 141 Secured,Bus de-energized,VC Chiller Breaker Racked Out & Bus re-energized ‎ (← links)
  • 05000456/LER-1991-001, :on 901218,1B Containment Spray Pump Inoperable Due to Use of Nonqualified Power Supply Breaker.Breakers Removed & Replaced W/Qualified Breakers.Training Will Be Provided for Equipment Operators ‎ (← links)
  • 05000456/LER-1991-002-03, :on 910208 & 26,radiation Monitors Declared Inoperable Due to Inadequate Technical Review of Radiation Monitor Operability & Procedural Deficiencies.Ilrt Surveillance Will Be Revised ‎ (← links)
  • 05000456/LER-1994-007-02, :on 940407,SG Tube Found Degraded Due to Axial Outer Diameter Stress Corrosion Cracking.Corrective Actions: Implemented Programs to Mitigate Corrosive Environment in Tube Support ‎ (← links)
  • 05000456/LER-1994-010-02, :on 940515,DG Declared Inoperable.Caused by Exhaust Header Pressure Transient,Resulting in Blown Rupture Disc & Lifted Silencer Relief.Rupture Disc Replaced & Maint Run Performed Successfully ‎ (← links)
  • 05000456/LER-1994-009-02, :on 940425,unexpected Reactor Trip Actuation Occurred Due to Procedural Deficiency W/Procedure Bwop RP-7. Procedure Bwop RP-7 Revised to Identify Fact That Reactor Trip Function Not Disabled by Procedure ‎ (← links)
  • 05000456/LER-1994-008-03, :on 940421,both DGs Declared Inoperable Due to Misinterpretation of Surveillance Data.Caused by Personnel Error.Dg 550 Load Rejection Test for DGs 1A & 1B Reperformed After Adjusting Kvar Loading ‎ (← links)
  • 05000456/LER-1991-001-06, :on 910121,containment Spray Pump 1B Inoperable Due to Nonqualified Power Supply Breaker.Caused by Personnel Error.Breakers Replaced & non-1E Breakers Labeled to Preclude Installation ‎ (← links)
  • 05000456/LER-1990-022-02, :on 901207,discovered That on 901121,fuel Handling Bldg Crane Interlocks Inadequate to Prevent Movement Over East Corner of Spent Fuel Pool.Caused by Procedural Deficiency.Procedures Revised ‎ (← links)
  • 05000456/LER-1990-020-02, :on 901129,auxiliary Bldg Inaccessible Filter Plenum Charcoal Booster Fan OB,OVA03CB Spuriously Auto Started.Caused by Component Failure.Relay Replaced & Fan Circuitry & Breaker Checked ‎ (← links)
  • 05000456/LER-1990-021-02, :on 901201,reactor Trip Occurred When Feedwater Pump 1A & One of Two Online Feedwater Pumps Tripped.Caused by Low Oil Pressure Due to Partial Plugging from Sludge Burst.Oil Sys Cleaned ‎ (← links)
  • 05000456/LER-1994-005-01, :on 940323,inadvertent Start of DG 1B Occurred During Surveillance Testing.Caused by Miscommunication Between Personnel.Offsite Power Restored to Bus 142 & DG 1B Secured ‎ (← links)
  • 05000456/LER-1990-019-02, :on 901006,outside Air Control Room Ventilation Actuation Due to Spurious Spike of PRM ‎ (← links)
  • 05000456/LER-1994-003-05, :on 940311,as Found Integrated Leak Rate Test Failures Occurred.Caused by Preservice Const Deficiencies. Missing Caps on Emergency Hatch Concrete Vent Pipes Installed & Test Reperformed Satisfactorily ‎ (← links)
  • 05000456/LER-1994-004-05, :on 940309,improper Value for Mean Seat Area Was Used in Trevitest Calculation for MSSV Setpoints.Caused by Programmatic Deficiency.Mssvs Will Be Reset on or Before 940409 ‎ (← links)
  • 05000456/LER-1990-016-03, :on 900828,auxiliary Bldg Inaccessible Filter Plenum a Charcoal Booster Fan Ob Spuriously Auto Started. Root Cause Undetermined.Fan Breaker & Control Circuitry Checked ‎ (← links)
  • 05000456/LER-1994-002-05, :on 940218,main Control Room Ventilation Dampers Declared Inoperable Due to Battery Failure.Caused by Programmatic Deficiency.Preventive Maint Provided for Damper Actuations ‎ (← links)
  • 05000456/LER-1994-001-06, :on 940202,identified Minimum Required Torque to Open & Close Valves Under High Differential Pressure Conditions Greater than Motor Capability.Caused by Inappropriate Valve Actuator Sizing ‎ (← links)
  • 05000456/LER-1990-017-02, :on 900906,inadequate Thrust Capability of Auxiliary Feedwater Valve Operators Occurred Due to Design Deficiency.Emergency Procedures Directing Actions to Isolate Faulted Steam Generator Revised ‎ (← links)
  • 05000456/LER-1990-013-02, :on 900811,feedwater Isolation Occurred Due to Spurious Actuation of Train B Feedwater Isolation Circuitry. Feedwater Isolation Reset & Feedwater Flow Reestablished to Steam Generators ‎ (← links)
  • 05000456/LER-1993-007-07, :on 931213,both Trains of Control Room Ventilation Declared Inoperable Due to Equipment Failure & Procedural Deficiency.Failed Hydramotor Replaced & Frequency of Loop Calibr Will Be Increased ‎ (← links)
  • 05000456/LER-1993-006-01, :on 931209,MDAFWPs Declared Inoperable & LCO Action Requirement 3.7.1.2.a Entered Due to Potential Unavailability of MDAFWPs During Stated Scenario.Temporary Alterations 93-1-018 & 93-2-025 Installed ‎ (← links)
  • 05000456/LER-1993-006-09, :on 931209,potential Inoperability of Auxiliary Feedwater Switchover Due to Inadequate Design Change Identified.Caused by Design Change.Procedures Tested & Revised ‎ (← links)
  • 05000456/LER-1990-018-02, :on 900929,spurious Train B Solid State Protection Sys Actuations Occurred Due to Component Failure ‎ (← links)
  • 05000456/LER-1990-014-01, :on 900812,entry Into Mode 3 Occurred Prior to Performing 1B MSIV Operability Test.Caused by Mgt, Procedural & Communication Deficiency & Inadequate Review. Training Provided ‎ (← links)
  • 05000456/LER-1990-011-03, :on 900802,identified That Discharge Check Valve Failed Permitting 1A SX Pump to Rotate in Reverse Direction When Shut Down.Caused by Component Failure.Valve Repaired ‎ (← links)
  • 05000456/LER-1990-012-03, :on 900803,safety Injection Accumulator 1A & 1B RHR Pumps Declared Inoperable Due to Small Weld Crack in 3/4 Inch Test Line.Weld of Orifice Nipple to Socket & of Coupling 3/4 Inch Line Removed & Replaced ‎ (← links)
  • 05000456/LER-1990-010-04, :on 900711,Control Room Chiller Oa Failed to Trip from Control Switch.Breaker Found to Be Mechanically Binding Causing Breaker to Remain Closed When Given Trip Signal.Breaker Sent for Mfg Failure Analysis ‎ (← links)
  • 05000456/LER-1990-008-06, :on 900608,reactor Trip Occurred Due to High Flux Rate Signal from Power Range Nuclear Instrumentation. Caused by Voltage Transient,Resulting from Lightning Striking Containment.Power Supply Reset ‎ (← links)
  • 05000456/LER-1990-007-04, :on 900601,during Removal of Ohmmeter Probe, Operator Touched Probe to Exposed Terminal Point,Resulting in Automatic Start of Auxiliary Feedwater Pump 1A.Caused by Methodology Deficiency.Probes Modified ‎ (← links)
  • 05000456/LER-1990-006-04, :on 891204 & 900416,diesel Generator 1B Experienced Slow Start.Caused by Crisscrossed Starting Airlines for Cylinders 6L & 9L.Starting Airlines Reconnected & Verified to Correct ‎ (← links)
  • 05000456/LER-1990-005-07, :on 900413,determined That Pressures for MSIVs a & D Were Outside Acceptance Criteria of Procedure.Caused by Procedural Deficiencies.Procedures Being Revised to Reflect Values of 4,800 Psig to 6,000 Psig ‎ (← links)
  • 05000456/LER-1993-004-05, :on 930328,quadrant Power Tilt Ratio Calculated Using Three Operable power-range Channels Instead of Four Channels Required by Ts.Caused by Personnel Error. Personnel Counseled Re Performance ‎ (← links)
  • 05000456/LER-1993-003-05, :on 930222,lead for Ssps Test Logic Circuitry Landed on Wrong Terminal Board Point.Caused by Preservice Design Deficiency.Wires Moved to Positions Specified in Schematic Drawings & Wiring List Changed ‎ (← links)
  • 05000456/LER-1993-002-05, :on 930201,identified Nonconservatism in Heatup/Cooldown & Cold Overpressure Protection PORV Setpoint Curves.Caused by Design Deficiency.Curve Book & Surveillance Procedures Revised ‎ (← links)
  • 05000456/LER-1990-004-07, :on 900328,containment Ventilation Isolation Actuation Occurred.Caused by Perturbation of 345 Kv Transmission Sys as Result of Phase B Insulator Failure. Engineering Evaluation Conducted on Monitors ‎ (← links)
  • 05000456/LER-1990-003-08, :on 900326,trip Nuclear Instrumentation Bistables Failed to Trip within 6 H Required by Tech Specs. Caused by Personnel Error.Training Will Be Conducted for Operating Personnel.Procedures Revised ‎ (← links)
  • 05000456/LER-1994-006-01, :on 940330,discovered That Braidwood Cooling Lake Hydrographic Survey Was Not Completed within Required Time.Cause Was Personnel Error.Corrective Action: Surveillance Was Completed within 24 Hours ‎ (← links)
  • 05000456/LER-1990-023-02, :on 901230,generator Neutral Ground Overcurrent Protective Relay Actuated & Tripped Main Generator.Caused by Internal Generator Defect.Main Generator Disassembled & Rotor Removed to Locate Ground ‎ (← links)
  • 05000456/LER-1990-015-02, :on 900827,auxiliary Bldg Vent Stack Grab Sample Missed.Caused by Personnel Error & Deficient Work Practices.Training Provided,Program Modified & Station Reviewing Nonroutine Surveillance Process ‎ (← links)
  • 05000456/LER-1991-005-02, :on 910326,main Control Room Ventilation Sys Shifted to Emergency Mode of Operation Due to Momentary Fluctuation in Voltage Available to Monitor.Lightning Protection Sys Being Modified ‎ (← links)
  • 05000456/LER-1990-002-03, :on 900119,discovered That Flanges Not Added to Procedure 1BwOS, Primary Containment Integrity Verification of Outside Containment Isolation Devices. Caused by Program Weakness.Training Held ‎ (← links)
  • 05000456/LER-1990-001-04, :on 900112,reactor Tripped During Dc Ground Isolation Activities When Auxiliary Relay Energized,Causing Turbine Governor & Reheat Interceptor Valves to Close.Caused by Increasing Steam Pressure.Valves Closed ‎ (← links)
  • 05000456/LER-1989-019-04, :on 891219,discovered That Procedure Did Not Adequately Test Response Times for High Steamline Pressure Rate Steamline Isolation Signal.Caused by Deficient Procedure.Procedures Re Response Time Revised ‎ (← links)
  • 05000456/LER-1989-017-05, :on 891206,gas Detector Channel of Process Radiation Monitor Experienced Spike,Resulting in Alert Alarm.On 891210,spike on Channel Resulted in High Radiation Alarm.Caused by Failed Detector ‎ (← links)
  • 05000456/LER-1989-018-04, :on 891215,as Lead on volt-ohm Meter Landed, Containment Bldg Fuel Handling Incident Area Radiation Monitor Went Into Alert Alarm & Interlock Actuation.Caused by Procedure Deficiency.Signal Reset ‎ (← links)
  • 05000456/LER-1989-016-05, :on 891201,RHR Pump Suction Relief Valve Premature Actuation Occurred & Failed to Reseat.Caused by Deficient Work Practices & Pesonnel Error.Maint Procedures Reviewed.Training Conducted ‎ (← links)
  • 05000456/LER-1987-006-03, :on 870120,4 H Fire Watch Patrol Detained by Radiation Chemistry Personnel Due to Not Signing Latest Radiation Work Permit & on 870131,did Not Start Route.Caused by Personnel Error.Personnel Retrained ‎ (← links)
  • 05000456/LER-1989-020-04, :on 891223,failure to Verify Safety Injection Accumulator Boron Concentration within Specified Time.Caused by Programmatic Deficiency.Procedure Revised to Include Action Requirement Sheet ‎ (← links)
  • 05000456/LER-1989-013-04, :on 891005,discrepancy W/Design of Steam Generator Blowdown Sys Identified,Minimizing Auxiliary Feedwater Flow Requirements.Caused by Preservice Design Deficiency.Temporary Design Changes Made ‎ (← links)
  • 05000456/LER-1989-002-01, :on 890416,main Steamline Low Pressure Reactor Trip,Safety Injection & Main Steamline Isolation Occurred. Caused by Mgt & Procedural Deficiencies.Formal Policy on Use of Extra Operator During Startup Developed ‎ (← links)
  • 05000456/LER-1989-015-04, :on 891020,sample Canisters for Auxiliary Bldg Vent Stack Radiation Monitor Removed & Not Analyzed within 48 H.Caused by Programmatic Deficiencies & Personnel Error. Procedures & Training Programs Revised ‎ (← links)
  • 05000456/LER-1989-014-05, :on 891030,inadvertent Safety Injection Occurred on Train B During Installation of Card Holders. Caused by Personnel Error Design Deficiency.Sys Mod Request Submitted ‎ (← links)
  • 05000456/LER-1989-012-05, :on 891016,momentary Loss of Power to Fuel Handling Bldg (Fhb) Area Radiation Monitor Caused Fhb Charcoal Booster Fan to Auto Start.Caused by Personnel Error.Fan Secured & Isolation Signal Reset ‎ (← links)
  • 05000456/LER-1989-011-04, :on 890920,high Head Safety Injection Valve 1SI8801A Not Capable of Being Powered by Operable Emergency Power Source.Caused by Diesel Generator 1A Being Out of Svc. Policy Statement Issued & Program Revised ‎ (← links)
  • 05000456/LER-1989-010-04, :on 890915,measured Leakrate of Hydrogen Analyzer Containment Isolation Valve Was Larger W/Valve Indicating Closed.Caused by Incorrect Labeling of Coil Leads.Valve Replaced W/Different Model Valve ‎ (← links)
  • 05000456/LER-2019-001, Unit Trip on Low Steam Generator Level Due to Failure of a Controller on a Feedwater Regulating Valve ‎ (← links)
  • 05000456/LER-2018-006, Manual Unit Trip on Low Steam Generator Level Following Trip of a Turbine Feedwater Pump Due to a Design Issue ‎ (← links)
  • 05000456/LER-2018-005, Unit Trip on Turbine Anti-Motoring Circuit Caused by Weld Blockage of Instrument Line with a Failed Differential Pressure Switch Assembly ‎ (← links)
  • 05000456/LER-2018-004, A Emergency Diesel Generator Output Breaker Opened During a Surveillance Which Resulted in Unplanned Actuations of Bus 141 Undervoltage Relay ‎ (← links)
  • 05000456/LER-2018-002, B Emergency Diesel Generator Tripped on Overspeed During Testing Due to Broken Close-Assist Springs on the Turbocharger Inlet Butterfly Valve While the 1A Emergency Diesel Generator Was Inoperable ‎ (← links)
  • 05000456/LER-2018-001, A Emergency Diesel Generator Lost Voltage During a Surveillance Due to a Failed Exciter Diode, Which Resulted in an Unplanned Actuation of Bus 141 Undervoltage Relay ‎ (← links)
  • 05000456/LER-2018-003, Indications on Top Head to Upper Center Disc Weld of Reactor Head Identified Due to New Inspection Standards ‎ (← links)
  • 05000456/LER-2016-002, Regarding Inadequate Protection from Tornado Missiles Identified Due to Non-Conforming Design Conditions ‎ (← links)
  • 05000456/LER-2016-001, Regarding Auxiliary Feedwater Diesel Intake Design Deficiency Related to Turbine Building High Energy Line Break Resulted in an Unanalyzed Condition Due to Insufficient Validation of Vendor Analysis Inputs ‎ (← links)
  • 05000456/LER-2015-003, Regarding Unanalyzed Condition Due to a Design Deficiency with Pressurizer Power Operated Relief Valve Circuitry That Could Prevent Valve Manual Closure to Mitigate Spurious Operation ‎ (← links)
  • 05000456/LER-2015-002, Regarding Indication in Control Rod Drive Mechanism Nozzle Weld Due to Embedded Flaws Opening Up from Thermal and Pressure Stresses During Operation ‎ (← links)
  • 05000456/LER-2015-001, Regarding Main Steam Isolation Valve Technical Specifications Applicability - MSIV Operability Position Change ‎ (← links)
  • 05000456/LER-2014-003, Regarding Unanalyzed Condition Due of Lack of Procedure Guidance Related to the Ultimate Heat Sink ‎ (← links)
  • 05000456/LER-2014-001, Regarding Inadequate Procedural Guidance Results in Non-Compliance with Technical Specification 3.4.3 - RCS Pressure and Temperature (P/T) Limits ‎ (← links)
  • 05000456/LER-2013-002, Re Liquid Penetrant Indications in Embedded Flaw Repair of Control Rod Drive Mechanism Penetration 69 During Refueling Outage ‎ (← links)
  • 05000456/LER-2013-001, Inadequate Operability Determination Procedure Guidance Results in Inadvertent Missed Technical Specification Action for Diesel Generator ‎ (← links)
  • 05000456/LER-2012-005, Incorrect Procedure Guidance Due to a Lack of Technical Rigor Resulted in Unplanned Inoperability of the 1A and 1 B Emergency Diesel Generators ‎ (← links)
  • 05000456/LER-2012-004, Regarding Notice of Enforcement Discretion Received for Ultimate Heat Sink Temperature Exceeding Technical Specifications Requirements Due to Prolonged Hot Weather ‎ (← links)
  • 05000456/LER-2012-003, Fuel Handling Incident Area Radiation Monitors Inoperable Due to Incorrect Alarm Setpoint ‎ (← links)
  • 05000456/LER-2012-002, Regarding Reactor Pressure Vessel Head Control Rod Drive Mechanism Penetration Nozzle Weld Indication Attributed to Primary Water Stress Corrosion Cracking ‎ (← links)
  • 05000456/LER-2012-001, Regarding Two Main Steam Safety Valves Failed Pre-outage Setpoint Testing Due to Abnormal Spring Geometry ‎ (← links)
  • 05000456/LER-2011-004, Regarding Non-Conservative Historic Assumptions Identified in Turbine Building High Energy Line Break Analyses Result in Potential for Two Channels in a System to Become Inoperable ‎ (← links)
  • 05000456/LER-2011-003, Withdrawal of LER 11-003-00 for Braidwood Station, Units 1 & 2 Re Drained Sections of Piping in Auxiliary Feedwater Suction Lines ‎ (← links)
  • 05000456/LER-2011-002, Regarding Loss of Unit 1 Train a Bus 141 Degraded Undervoltage Function ‎ (← links)
  • 05000456/LER-2011-001, Regarding Through Wall Crack on 1A Safety Injection Pump Discharge Line Due to Outside Diameter (Transgranular) Stress Corrosion Cracking Initiated at External Diameter of Pipe ‎ (← links)
  • 05000456/LER-2010-007, Regarding Potential Loss of Residual Heat Removal System Safety Function in Mode 4 When Aligned for Shutdown Cooling Due to Potential for Flashing or Voiding of Coolant During a Shutdown Loss of Coolant Accident ‎ (← links)
  • 05000456/LER-2010-005, Incorrect Methodology Used in Calculations in 1999 Resulted in Non-Conservative Control Room Outside Air Intake Monitor Alarm Setpoints ‎ (← links)
  • 05000456/LER-2010-006, For Braidwood Station, Unit 1 Regarding Technical Specifications Allowed Outage Time Extension Request for Component Cooling System Contained Inaccurate Design Information That Significantly Impacted the Technical Justification ‎ (← links)
  • 05000456/LER-2010-004, Reactor Trip Due to Performance of a Channel Calibration with a Coincident Bistable in a Half-Trip Condition ‎ (← links)
  • 05000456/LER-2010-003, Regarding Through-weld Leak of the Line from the 1B Seal Injection Filter to the Vent Valve ‎ (← links)
  • 05000456/LER-2010-002, Regarding Limiting Condition for Operation Action Not Completed within the Required Time ‎ (← links)
  • 05000456/LER-2010-001, Regarding Reactor Trip Due to Water Intrusion in Breakers Causing Circulating Water Pump Trips and Resulting in Loss of Condenser Vacuum ‎ (← links)
  • 05000456/LER-2009-002, Regarding Safety Injection System Containment Sump Isolation Valve 1518811B Failed to Stroke Full Open Due to Torque Switch Assembly Corrosion ‎ (← links)
  • 05000456/LER-2009-001, For Braidwood Station, Unit 1, Steam Generator Tube Exceeding Plugging Criteria Remained in Service During Previous Cycle ‎ (← links)
  • 05000456/LER-2008-002, For Braidwood, Unit 1, Regarding Unit 1 Containment Isolation Valve 1PS229B De-energized Open Instead of Closed Per Technical Specification 3.6.3 ‎ (← links)
  • 05000456/LER-2008-001, Regarding Technical Specification Non-Compliance Due to Inadequate Design of Auxiliary Feedwater (AF) Tunnel Access Covers Causing AF Valves within the Tunnel to Be Inoperable ‎ (← links)
  • 05000456/LER-2007-002, Power Range N43 Positive Rate Trip Inoperable Due to Miscalibration of Time Constant ‎ (← links)
  • 05000456/LER-2007-001, Re Reactor Trip Following a 345 Kv Transmission Line Lightning Strike ‎ (← links)
  • 05000456/LER-2006-002, Re Units 1 and 2 Entry Into Limiting Condition for Operation 3.0.3 Due to Main Control Room Ventilation Envelope Low Pressure ‎ (← links)
  • 05000456/LER-2006-001, Regarding Unit 1 Reactor Coolant System Pressure Boundary Leakage Due to Inter-Granular Stress Corrosion Cracking of a Pressurizer Heater Sleeve ‎ (← links)
  • 05000456/LER-2005-003, Regarding Licensed Maximum Power Level Exceeded Due to Feedwater Heater Transient ‎ (← links)
  • 05000456/LER-2005-002, Re Feedwater Isolation Valve 1FW039A Fails to Stroke in the Required Time Due to Failure of Valve Air Regulator to Maintain Set Pressure ‎ (← links)
  • 05000456/LER-2005-001, Regarding Technical Specification (TS) 3.9.4 Violation Due to Imprecise Original TS and TS Bases Wording ‎ (← links)
  • 05000456/LER-2004-003, On 08/16/2004, Oa Hydrogen Recombiner Identified to Be Inoperable Greater than Required Technical Specification Allowed Outage Time ‎ (← links)
  • 05000456/LER-2004-002, Regarding 1 C Reactor Containment Fan Cooler Discovered to Be Inoperable Greater than Required Technical Specification Allowed Outage Time ‎ (← links)
  • 05000456/LER-2004-001, Regarding Licensed Maximum Power Level Exceeded Due to Inaccuracies in Feedwater Ultrasonic Flow Measurements ‎ (← links)
  • 05000456/LER-2003-003, Licensed Maximum Power Level Exceeded Due to an Error in a Westinghouse Supplied Calorimetric Calculation Constant ‎ (← links)
  • 05000456/LER-2003-002, Residual Heat Removal Pump Technical Specification Completion Time Exceeded Requiring Notice of Enforcement Discretion Due to Poor Planning and Execution of Planned Maintenance ‎ (← links)
  • 05000456/LER-2003-001, From Braidwood Unit 1 Regarding Control Room Ventilation System Alignment Results in Inoperable Radiation Monitors Without Taking Required Actions Per TS Due to Inadequate Evaluation of Original Procedures & Some Subsequent Rev ‎ (← links)
  • 05000456/LER-2002-003, Isolated Loop Reactor Coolant System Boron Sample Outside of Technical Specification Frequency Requirement Due to Misapplication of the Implementing Procedure ‎ (← links)
  • 05000456/LER-2002-002, Failure of Pressurizer PORV Instrument Air Accumulator Isolation Check Valves to Isolate Caused by Improper Maintenance Procedures ‎ (← links)
  • 05000456/LER-2001-001-01, Three Main Steam Safety Valves Exceeded the Technical Specification Limit by Greater than 3% on September 19 and 20, 2001 ‎ (← links)
  • 05000456/LER-2002-001, Set Point Drift Causes Two of Three Pressurizer Safety Valve Lift Tests to Exceed Technical Specification Tolerance on April 8, 2002 ‎ (← links)
  • 05000456/LER-2025-001, Over Temperature Delta Temperature Due to Lightning Strike ‎ (← links)
• BW250042, Trip on Over Temperature Delta Temperature Due to Lightning Strike (Letter) ‎ (← links)