Pages that link to "05000341/LER-2020-001, Secondary Containment Inoperable Due to Both Airlock Doors Open"
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The following pages link to 05000341/LER-2020-001, Secondary Containment Inoperable Due to Both Airlock Doors Open:
Displayed 13 items.
- 10 CFR 50.73(a)(2)(ii)(B), Unanalyzed Condition (← links)
- 10 CFR 50.73(a)(2)(v)(A), Loss of Safety Function - Shutdown the Reactor (← links)
- 10 CFR 50.73(a)(2)(v)(B), Loss of Safety Function - Remove Residual Heat (← links)
- 10 CFR 50.73(a)(2)(vii), Common Cause Inoperability (← links)
- 10 CFR 50.73(a)(2)(ii)(A), Seriously Degraded (← links)
- 10 CFR 50.73(a)(2)(i)(A), Completion of TS Shutdown (← links)
- 10 CFR 50.73(a)(2)(ix)(A), Prevented Safety Function in Multiple System (← links)
- 05000341/LER-2020-002, Valid Actuation of Emergency Diesel Generators During Partial Loss of Offsite Power (← links)
- ML20114E190 (redirect page) (← links)
- 05000341/LER-2020-001 (redirect page) (← links)
- 05000341/LER-2002-006 (← links)
- 05000341/LER-2001-003 (← links)
- 05000341/LER-2001-002 (← links)
- 05000341/LER-2001-001 (← links)
- 05000341/LER-1995-008, Provides Commitment Made Re Suppl to LER 95-008 Concerning Nonconservative Bias in Heat Balance Methodology for Calculating Core Thermal Power (← links)
- IR 05000341/2020003 (← links)
- 05000341/LER-2024-002, Primary Containment Isolation Valve Declared Inoperable for a Period Prohibited by Technical Specifications (← links)
- 05000341/LER-2024-001, Automatic RPS Scram on High RPV Pressure While Attempting to Lower Generator Output During RF-22 (← links)
- 05000341/LER-2023-002, Technical Specification Completion Time Exceeded Due to Repairs on the MDCT Fan D (← links)
- 05000341/LER-2023-001-01, Loss of Mechanical Draft Cooling Tower Fan Brakes During High Speeds Leads to Loss of Safety Function and Inoperability (← links)
- 05000341/LER-2023-001, Loss of Mechanical Draft Cooling Tower Fan Brakes During High Speeds Leads to Loss of Safety Function and Inoperability (← links)
- 05000341/LER-2022-004, Containment Isolation Valve Actuator Found Disconnected from Its Bonnet Resulting in Condition Prohibited by Technical Specifications (← links)
- 05000341/LER-2022-003, Turbine Trip and Subsequent Reactor Trip Due to Mayflies (← links)
- 05000341/LER-2022-002, Unexpected High Pressure Coolant Injection Turbine Trip (← links)
- 05000341/LER-2022-001, Reactor Scram on Low Reactor Pressure Vessel Level (← links)
- 05000341/LER-2021-002-01, Unplanned Inoperability of High Pressure Coolant Injection System Due to an Inverter Circuit Failure (← links)
- 05000341/LER-2021-003, High Pressure Coolant Injection Inoperable Due to Contact Oxidation (← links)
- 05000341/LER-2021-002, Unplanned Inoperability of High Pressure Coolant Injection System Due to an Inverter Circuit Failure (← links)
- 05000341/LER-2021-001, Unrecognized Impact of Opening of Barrier Doors on High Energy Line Break Analysis (← links)
- 05000341/LER-1989-007, :on 890307,increasing Trend Observed in Vibration of Number 8 Bearing on Main Turbine Generator. Cause Undetermined.Turbine Balanced in Subsequent Outage. Disassembly &/Or Insp of Portions Planned (← links)
- 05000341/LER-1989-020, :on 890830,removal of Incorrect Fuse Caused Actuation of Standby Gas Treatment Sys Div I & Isolation of Reactor Bldg Hvac.Caused by Personnel Error.Critique of Event Conducted (← links)
- 05000341/LER-1989-018, :on 890818,both Divs of Control Ctr HVAC Shifted from Normal to Recirculation Mode Due to Blown Fuse. Caused by Personnel Error.Accountability Meeting Held & Equipment to Be Rearranged (← links)
- 05000341/LER-1989-019, :on 890819,pressure Control to HVAC Sys Lost, Resulting in Decrease in Control Room Air Pressure.Caused by Seized Bearings & Fan Not Rotating.Shaft & Bearings Replaced & Fan Placed Back in Svc (← links)
- 05000341/LER-1989-013, :on 890624,reactor Bldg HVAC Isolated & Standby Gas Treatment Sys Automatically Started.Caused by Personnel Error.Potential Design Change Written to Improve Testability at Panel (← links)
- 05000341/LER-1989-012, :on 890603,various Div I Isolations/Actuations Experienced During one-time Surveillance Procedure to Allow Installation of Star Lugs.Caused by Inadequate Technical Review of Temporary Procedure Change (← links)
- 05000341/LER-1989-006, :on 890226,turbine Trip & Reactor Scram Occurred While Resetting Pushbutton for Main Turbine Mechanical Overspeed Test.Caused by Poor Design of Trip Linkage.Event Critique Discussed W/Personnel (← links)
- 05000341/LER-1989-010, :on 890420,deficiency in Design of Ductwork of Control Ctr HVAC Vs Description of Compliance to Reg Guide 1.52 in Updated FSAR Noted.Caused by Outdated Spec.Seismic Analysis of Existing Ductwork Underway (← links)
- 05000341/LER-1989-015, :on 890707,power Lost to Div I Reactor Protection Sys Bus a Due to Motor Generator Overvoltage Condition.Caused by Single Phase Sensing Potentiometer. Component Replaced W/Fixed Resistor (← links)
- 05000341/LER-1989-017, :on 890810,determined That Consequences of Revised Analysis Are Addl Flooding Beyond That Previously Analyzed.Documentation for Updated FSAR Conclusions Cannot Be Located.Analyses Reviewed for Incorporation (← links)
- 05000341/LER-1989-011, :on 890602,backup Manual Scram Breaker B Failed to Trip.Caused by Mechanical Binding of Parts Between Undervoltage Trip Unit & Circuit Breaker.Design Change to Remove Breaker Scheduled (← links)
- 05000341/LER-1989-014, :on 890603 & 18,discovered That Both Channels Bypass/Unbypass Functions Were Slightly Above Limits Allowed in Tech Specs.Caused by Emphasis on Checking Bypass Function of Bistable.Channels Properly Calibrated (← links)
- 05000341/LER-1989-016, :on 890711,Div I of RHR Svc Water Sys Conservatively Declared Inoperable Due to Low Nitrogen Pressure for Fan Brakes in Cooling Tower.Caused by Leak in Hoses.Nitrogen Hose Replaced (← links)
- 05000341/LER-1989-009, :on 890421,investigation Determined That Use of Control Room Pushbotton Switches for Manual Initiation of Isolation Valves May Not Meet Design Criteria.No Record of Design Upgrade Found.Test Procedures Revised (← links)
- 05000341/LER-1989-008, :on 890316,emergency Equipment Cooling Water Sys Actuated During Surveillance.Caused by Personnel Error. Accountability Meeting Held Between Personnel Involved & Mgt.Potential Design Change Will Be Evaluated (← links)
- 05000341/LER-1989-005-01, :on 890208,determined That Inflatable Seals for Railroad Airlock Doors Could Be Affected Since Seals Supplied from non-Q Air Supply.Caused by Design Deficiency. Rev to Surveillance Requirement Expected (← links)
- 05000341/LER-2020-002, Valid Actuation of Emergency Diesel Generators During Partial Loss of Offsite Power (← links)
- 05000341/LER-1987-038, :on 870815,automatic Initiation of Div I Emergency Equipment Cooling Water (EECW) Occurred.Caused by Inadequate Sys Design for Pressure compensation.Motor- Operated Valves Installed to EECW Makeup Tanks (← links)
- 05000341/LER-1987-039, :on 870807,backup Manual Scram Breaker a Failed to Trip.Caused by Inadequate Instruction & Poor Work Practices by Plant Personnel.Breaker Tested for Normal Trip Function & Replaced (← links)
- 05000341/LER-1987-025, :on 870625,reactor Protection Sys Actuated & Several ESFs Challenged.Caused by Pressure Spike Sensed by Reactor Vessel Water Level Transmitters on Common Ref Leg. Multi-turn Needle Valves Will Be Installed (← links)
- 05000341/LER-1987-033, :on 870729,RWCU Containment Isolation Valve Closed Due to High Effluent Temp.Caused by Personnel Error & Failure of Alarms to Annunciate.Operator Disciplined & Investigation Into Alarm Failure Will Be Made (← links)
- 05000341/LER-1987-021, :on 870607,RCS Leakage Limit Surveillance Interval,Including 25% Max Allowable Extension,Exceeded by 1 H.Caused by Personnel Error.Instructions Given to Personnel Re Completing Surveillance on Time (← links)
- 05000341/LER-1987-032, :on 870726,control Ctr HVAC Sys Shifted from Normal Operation to Chlorine Mode.Caused by Use of two-way Radio.Surveillance Procedure for Fire Detection Operability & Functional Test Revised (← links)
- 05000341/LER-1987-036, :on 870802,improper Valve Line Up During Fill & Vent Operation of RHR Caused Reactor Water to Divert from Reactor Vessel to Suppression Pool Causing Reactor Scram to Occur.Caused by Operator Error (← links)
- 05000341/LER-1987-037, :on 870804,inadvertent Closure of Inboard MSIVs Occurred During Transfer of Reactor Protection Sys Bus Power Sources.Caused by Inadequate Procedure.Procedure Revised to Require Energization of Ac Solenoids (← links)
- 05000341/LER-1987-034, :on 870730,scheduling of Fire Brigade Practices Discovered to Be Inconsistent W/Operation Procedures.Caused by Misinterpretation of Training Schedule.Fire Protection Program Will Be Rewritten (← links)
- 05000341/LER-1987-035, :on 870731,reactor Shutdown Initiated Due to Excessive Primary Containment Valve Leakage.Caused by Random Component Failure & Reactor Power Level Increase.Check Valve Repaired.Addl Training Will Be Administered (← links)
- 05000341/LER-1987-031, :on 870720,high Vibration Signal Caused Turbine Control Valve Fast Closure & Reactor Scram Resulted.Caused by Erroneous High Vibration Signal from Faulty Shaft Rider Sensor Connection.Design Change Being Prepared (← links)
- 05000341/LER-1987-019, :on 870523,standby Gas Treatment Sys Manual Actuation Puff Test Incorrectly Scheduled.Caused by Personnel Error.Program Revised to Reflect Correct Test Frequency (← links)
- 05000341/LER-1987-007-01, :on 870317,steam Flashing Occurred in RHR Pipes Causing Reactor Protection Sys & Automatic ESF Isolation. Caused by Failure of 24 Inch Injection Check Valve to Open. Open Limit Switch Adjusted & Procedure Issued (← links)
- 05000341/LER-1987-042, :on 870902,control Ctr HVAC Sys Shifted to Chlorine Mode W/No Chlorine Present.Cause Unknown. Availability & Design of Less Radio Frequency Sensitive Detectors Under Study.Radio Use Restricted (← links)
- 05000341/LER-1998-004, :on 980818,manual Scram Occurred in Response to Reactor Power Flunctuations.Caused by Unstable Flow Through Number 4 Hpt Cv.Reviewed Data from 1996 to Present Re Plant Operation Between 60% & 70% Power (← links)
- 05000341/LER-1996-005, :on 960327,declared EECW Inoperable & TS Required Shutdown Commenced Due to Design Issue.Design Mod Implemented to Provide SR make-up Sources for Both make-up Water & Nitrogen to EECW make-up Tank (← links)
- 05000341/LER-1996-005-01, Forwards LER 96-005-01 Re EECW Being in Unanalyzed Condition & Subsequent TS Required Shutdown.Commitments Made by Util, Listed (← links)
- 05000341/LER-1987-051, :on 870929,differential Pressure Actuation of Emergency Equipment Cooling Water Occurred.Caused by Design Deficiency in Reactor Bldg Closed Cooling Water Sys.Time Delay on Pressure Switches Lengthened (← links)
- 05000341/LER-1987-048, :on 871008,channel Check for Reactor Protection Sys Drywell High Pressure Instrumentation Omitted in Surveillance Procedure.Caused by Incomplete Surveillance Procedure.Procedure Revised (← links)
- 05000341/LER-1998-003, :on 980317,noted That Potential Drain Path to Hotwell or Condensate Return Tank Could Reduce CST Level. Caused by Inadequate Review of Dedicated Shutdown Sys. Completed Spurious Component Actuation Review of CST Piping (← links)
- 05000341/LER-1998-003-01, Forwards LER 98-003-01,which Addresses Issues Identified as Result of Investigation of Fire Induced Spurious Operation of Valves That Could Cause Inadvertent Opening of Drain Path from CST to Hotwell.Commitments Listed (← links)
- 05000341/LER-1997-006, :on 970320,response Time Testing Was Not in Conformance W/Ts.Caused by Inadequate Review of Ts.Affected ECCS Actuation Instrumentation Channels Response Time Testing Was Completed on 970326 & 27 (← links)
- 05000341/LER-1997-006-01, Forwards LER 97-006-01,re Response Time Testing Not Being Conducted IAW Ts.Rev Provides Revised Dates of non- Compliance Found During Review Being Conducted for Extension of Surveillance Intervals for Current Cycle 6 (← links)
- 05000341/LER-1987-053, :on 871024,2 H Tech Spec Time Constraint for Allowing Instrument Channel to Be Inoperable Exceeded. Caused by Personnel Error.Checklist Developed as Guide for Performing Surveillance Procedure 44.020.015 (← links)
- 05000341/LER-1987-052, :on 871017,determined Violation of Primary Containment Integrity May Have Occurred.Caused by Lack of Communication Between Util & Nrc.Temporary Exemption from GDC 56 Applied for & Verbally Granted (← links)
- 05000341/LER-1987-049, :on 870925,three Deficiencies Identified in Fire Protection Program.Cause Not Stated.Fire Brigade Training Program Revised,Valve Locked Into Position, Procedure Revised & Training Classes Held (← links)
- 05000341/LER-1987-043-01, :on 870902,control Ctr HVAC Sys Shifted from Normal to Recirculation Mode.Investigation Continuing to Determine Cause of Event.Corrective Actions Will Be Based on Results of Investigation (← links)
- 05000341/LER-1987-041, :on 870329,accident Range Monitor Inoperable. Caused by Inadequate Sys Turn Over Following Preoperational Testing.Channel Parameters Will Be Verified Daily & Tech Spec Interpretation Issued (← links)
- 05000341/LER-1987-040, :on 870827,reactor Protection Sys (RPS) motor- Generator Set Tripped Causing Loss of Power to RPS Bus a & Div I Isolation Signal.Cause Not Determined.Poteniometer Will Be Cleaned on Regular Basis (← links)
- 05000341/LER-1987-026, :on 870625,RWCU Sys Isolation Occurred.Caused by Shutdown of RWCU Pumps While Reactor Operating Above Ambient Temps.Evaluation Being Made to Revise Sys Operating Procedure (← links)
- 05000341/LER-1987-027, :on 870626,inadvertent Increase in Reactor Coolant Temp During Operational Condition 4 (Cold Shutdown) Occurred.Caused by Personnel Error.Personnel Disciplined & Control Room Annunciator & Displays Modified (← links)
- 05000341/LER-1987-028, :on 870627,emergency Equipment Cooling Water Sys Actuation Occurred.Caused by Inadequate Procedure Rev. Procedure Revised (← links)
- 05000341/LER-1987-024, :on 870625,plant Shut Down Due to Inoperabilty of Reactor Recirculation Sys Loop.Caused by Loss of Spring Pressure on Brush Due to Excessively Worn Brush.Increased Insp Frequency Implemented (← links)
- 05000341/LER-1987-050, :on 870821,discovered RWCU Sys Operating Procedure Allowed RWCU HX to Be Placed in Bypass When Reactor Coolant Temp Reached 544 F.Caused by Failure of Engineering Dept to Identify Limitation (← links)
- 05000341/LER-1989-005, :on 890208,potential Concerns W/Secondary Containment Integrity Due to Use of non-Q Air Supply Noted, Following Test Failure.Caused by Wind Conditions Impacting Test Results.Foam Seal Installed within 4 H (← links)
- 05000341/LER-1987-047, :on 870918,discovered That Div I of Control Ctr HVAC Chiller Pump & Valve Operability Surveillance Had Not Been Completed by Critical Completion Date.Caused by Inadequate Training of Operators (← links)
- 05000341/LER-1987-045, :on 870908,fuse Removed Resulting in Loss of Dc Control Power Causing Loss of Power Supply to Swing Bus & to LPCI Loop Selection Valves.Caused by Personnel Error.Dc Control Circuitry for Bus 72C Redesigned (← links)
- 05000341/LER-1987-029, :on 870615,surveillance Requirement for Determining Operability of Circuits Inadequate.Caused by Misinterpretation of Tech Spec.Surveillance Procedure Revised to Reflect Surveillance Requirement (← links)
- 05000341/LER-1987-044, :on 870903,discovered That 82 Test,Vent & Drain Connections & 5 Bonnet Taps Not Verified Closed Per Tech Spec.Caused by Inadequate Containment Integrity Surveillance Procedures.Procedures Revised (← links)
- 05000341/LER-1987-023, :on 870710,isolation of RCIC Occurred During Functional Test.Caused by Repairman Leaving volt-ohm Meter Connected Across Relay in Channel D Simulating Closed Contact Condition.Channels Tested (← links)
- 05000341/LER-1989-004, :on 890118,HPCI Inoperable Due to Isolation Logic Functioning W/Nonconservative Trip Valve.Caused by Equipment Failure of Master Trip Unit (Rosemont 710 DU) E41-N657A.Instrument Repaired (← links)
- 05000341/LER-1987-046, :on 870820,identified Deficiencies in Raychem Installations.Caused by Inadequacies in Training of Raychem Installers,Lack of Insp Requirement & Previous Specification Deficiencies.Installations Repaired & Replaced (← links)
- 05000341/LER-1998-001, :on 980201,automatic Reactor Scram Occurred Due to Main Turbine Trip.Caused by Protective Relay Failure in 345 Kv Switchyard.Circuit Card Was Installed in 50BF Relay for CM Breaker in Jan 1997 (← links)
- 05000341/LER-1999-004, :on 990913,HPCI Sys Was Noted Inoperable.Caused by Failed HPCI Room Temp Switches.Replaced Temp Switches & HPCI Was Restored to Operable Status.With (← links)
- 05000341/LER-1998-002, :on 980220,inadvertent Load Shed of ESF Bus 72E During Performance of Surveillance Test Resulting in ESF Actuations Occurred.Caused by Inadequate Procedure Rev. Power Was Restored to Affected Loads by 1344 Hrs on 980220 (← links)
- 05000341/LER-1987-022, :on 870601,actuation of Recirculation Mode of Control Ctr HVAC Occurred.Caused by Inadequate Review While Preparing Work Package.Fuse Replaced,Control Ctr HVAC Sys Placed in Normal Mode & Personnel Counseled (← links)
- 05000341/LER-1987-020, :on 870528,automatic Start of Div II Emergency Diesel Generators Occurred.Caused by Repairman Working within Wrong Cabinet During Surveillance.Personnel Counseled & Events Details Will Be Reviewed W/Repairmen (← links)
- 05000341/LER-1997-014-01, Forwards LER 97-014-01 Which Addresses Issues Identified as Result of Investigation of Unsealed Penetrations in Auxiliary Bldg.Commitments Made in LER Listed (← links)
- 05000341/LER-1987-012, :on 870410,HPCI & RCIC Declared Inoperable Due to Blown Fuse.Caused by Failed Fixed Capacitor C-25 in Isolation Instrumentation.Hpci & RCIC Restored (← links)
- 05000341/LER-1987-011, :on 870406,during APRM Functional Testing, Reactor Scrammed.Caused by Personnel Error.Procedures for Performing APRM Functional Testing Revised & Individual Involved Couseled (← links)
- 05000341/LER-1987-018, :on 870520,during Troubleshooting of Leakage Discovered in Drywell,Rwcu Inboard Isolation Valve Isolated Twice & Outboard Isolation Valve Once.Caused by Latent Heat Migration in Sys Piping.Valve Repacked (← links)
- 05000341/LER-1986-028, :on 860915,inadvertent ESF Actuation of Isolation Valve Occurred During Testing.Probably Caused by Personnel Error Resulting from Test Lead Inadvertent Short Circuiting Across Relay Contacts (← links)
- 05000341/LER-1986-022, :on 860701,five Items Identified Where Inadequate Surveillance Procedures Resulted in Equipment or Sys Being Technically Inoperable.Caused by Inadequate Review.Tech Spec Checklist Added (← links)
- 05000341/LER-1986-026, :on 860806,electrical Fire Discovered in safety-related Motor Control Ctr.Caused by Personnel Error, Resulting in Incorrect Field Wiring Installation.Damaged Equipment Replaced & Wiring Corrected (← links)
- 05000341/LER-1987-017, :on 870513,south Reactor Feed Pump Turbine (Srfpt) Tripped Due to Apparent Srfpt High Pressure Casing Drain Valve Being Closed During Startup.Caused by Inadequate Procedure.Procedure Revised (← links)
- 05000341/LER-1987-016, :on 870510,reactor Protection Sys Actuated & ESFs Challenged Due to Transient in Common Ref Leg.Caused by Repairman Attempt to Crack Open Ref Leg Isolation Valve. Valves to Improve Repairman Control Installed (← links)
- 05000341/LER-1986-043, :on 861103,testing of Control Rod Max Scram Insertion Times Performed W/Rod Sequence Control Sys in Bypass W/O Performing Required Surveillance of Rod Worth Minimizer.Caused by Personnel Error (← links)
- 05000341/LER-1987-014, :on 870426,actuation of Reactor Protection Sys Occurred Due to Leakage Through Isolation Valves.Caused by Lack of Procedural Guidance.Procedure Used for ANSI & ASME Pressure Testing Will Be Revised (← links)
- 05000341/LER-1986-030, :on 860808,discovered Lube Oil Filter Checks for Emergency Diesel Generators Not Performed During Previous Quarter.Caused by Personnel Error.Filters Will Be Replaced & Inspected & Program Revised (← links)
- 05000341/LER-1986-024, :on 860806,during Startup,Spurious Actuation of Control Ctr Ventilation Sys Initiated.Caused by Interference from Handheld Radio frequency.Nonradio-based Communication Sys to Be Installed (← links)
- 05000341/LER-1986-041, :on 861021,plant Allowed to Operate W/Drywell Sump Flow Monitoring Sys Inoperable.Caused by Inadequate Procedure Which Resulted from Cognitive Personnel Error. Surveillance Procedure Revised (← links)
- 05000341/LER-1987-013, :on 870313,cracks Found on Some Termination Box Adaptors of Reactor Bldg Cooling Unit Fan Motors.Operability Review Completed on 870421.Caused by Weight of Components, Vibration & Overtightening of Mounting Bolts (← links)
- 05000341/LER-1987-015, :on 870416,sodium Pentaborate Concentrations in Standby Liquid Control Storage Tank Exceeded Tech Spec Limits.Caused by Personnel Errors & Inadequate Procedures. Procedures 77.000.04 & 78.000.72 Revised (← links)
- 05000341/LER-1986-039, :on 861016,discovered That Daily Channel Check for Main Condenser Offgas Monitoring Sys Noble Gas Activity Radiation Monitor Not Performed on Correct Instrument.Caused by Procedural Error.Procedure Revised (← links)
- 05000341/LER-1986-037, :on 861009,both HPCI & RCIC Sys Rendered Inoperable During Performance of Instrumentation & Control Surveillance Procedure 44.030.154.Caused by Personnel Error & Unclear Procedure.Procedure Clarified (← links)
- 05000341/LER-1986-033, :on 861005 & 06,three Pressure Transients on Instrument Rack Common Ref Leg Occurred.Caused by Personnel Error.Personnel Counseled & Provided Required Reading & Training on Event (← links)
- 05000341/LER-1986-035, :on 861005,manual Reactor Trip Occurred Due to Malfunctioning Gland Sealing Steam Pressure Regulator. Pressure Regulator Controls Recalib & Torque Switches Reset (← links)
- 05000341/LER-1986-049, :on 861227,RWCU Sys Isolated Due to High Differential Flow.Caused by Main Flange Gasket Failure in Filter/Demineralizer Sys a Resulting in RWCU Sys Leak.Maint Instruction Will Be Revised (← links)
- 05000341/LER-1987-006, :on 870211,damage to HPCI Turbine Occurred. Caused by Closed Governor Bearing Oil Supply Valve & Repositioned Thrust Bearing Oil Supply Valve.Governor Bearing & Turbine Shaft Replaced (← links)
- 05000341/LER-1986-023, :on 860731,ESF Actuation of Control Ctr Ventilation & Standby Gas Treatment Sys Occurred.Caused by Operator Inadvertently Resetting Wrong Radiation Monitor. Operator Counseled (← links)
- 05000341/LER-1986-019, :on 860707,reactor Bldg Ventilation & Exhaust Radiation Monitor Tripped,Causing Actuation of ESF Sys.Cause Undetermined.Time Delay Will Be Added (← links)
- 05000341/LER-1987-001, :on 870126,during Calibr Activities in RWCU Sys,Esf Isolation Actuation Received.Caused by Inadequate Communication Between Instrument Repairman & Shift Personnel.Personnel Counseled (← links)
- 05000341/LER-1986-046, :on 861219,determined That Differential Temp Trip Sys Inoperable.Caused by Personnel Error Resulting in Thermocouple Leads Being Mislanded.Leads Properly Installed & Personnel Disciplined (← links)
- 05000341/LER-1986-031, :on 860829:reactor Trip Occurred Due to High Reactor Pressure Condition.Caused by Personnel Error.Shift Briefings & Simulator Training Conducted.Procedure for Starting Heater Feed Pumps Clarified (← links)
- 05000341/LER-1986-029, :on 860823 & 26,inboard Containment Isolation Valve in Steam Supply Line to HPCI Sys Isolated Due to Transmitter Downscale Failure.Cause Undetermined.Units Sent to Rosemount,Inc for Evaluation (← links)
- 05000341/LER-1999-003, :on 990625,HPCI Sys Flow Controller Failed. Caused by Failure of Control Amplifier for Automatic HPCI Flow Control Loop.Replaced Control Amplifier Circuit Card. with (← links)
- 05000341/LER-1986-050, :on 861230,valve Sleeve Failure Resulted in Manual Isolation of Rwcu.Caused by Excessive Leakage Through Valve in RWCU Filter/Demineralizer Effluent Line.Procedure for Backwashing Revised (← links)
- 05000341/LER-1987-009, :on 870325,RHR Pump C Tripped Due to Inboard Isolation Valve Closing.Caused by Intermittent Failure of Master Trip Unit.Futher Investigation of Master Trip Unit Will Be Made by Mfg.Isolation Logic Reset (← links)
- 05000341/LER-1987-005, :on 870212,leakage Through Demineralizer Vessel Gasket Triggered Differential Flow Alarm Causing Manual ESF RWCU Isolation.Caused by Failure of Gasket Insert for Vessel Head.Gasket Design Modified & Replaced (← links)
- 05000341/LER-1986-045, :on 861117,during Sys Restoration,Incorrect Valving Sequence Caused Damage to Test Return Line for Condensate Storage & Return Tanks.On 861201,water Collected in Cable Vaults Released to Outflow Canal (← links)
- 05000341/LER-1986-044, :on 861210,during Postulated Accident Event, Potentially Degraded Torus Relief Line Isolation Identified. Caused by Design Deficiency.Mod Installed to Prevent Drywell Vacuum Breaker Limit Switch Failure (← links)
- 05000341/LER-1986-017, :on 860624,discovered That Emergency Equipment Cooling Water Sys Capacity Inadequate to Remove Drywell Cooler Heat Loads During Small Break Inside Drywell W/O Degrading Performance.Design Change Issued (← links)
- 05000341/LER-1988-026, :on 880723,unit Shut Down.Caused by Leakage in Valves E51-F007 & G33-F100 Which Developed Following Stroking of Valves While Plant in Operation.Stems on Valves Replaced & Valves Repacked (← links)
- 05000341/LER-1986-015, :on 860617,Eberline Radwaste Exhaust Radiation Sys Particulate Iodine & Noble Gas (Sping) Monitor Actuated Recirculation Mode of Control Ctr HVAC Sys.Caused by Loss of Ac Power Supply (← links)
- 05000341/LER-1987-007, :on 870317,while Preparing Unit for Shutdown for Outage,Operators Voided RHR Piping Resulting in ESF & Reactor Protection Sys Actuation.Caused by Inadequate Procedure.Procedure Being Reviewed (← links)
- 05000341/LER-1986-021, :on 860720,while in Cold Shutdown,Rwcu Inboard Isolation Valve Autoisolated Three Times.Caused by Blown Fuses & Broken Differential Temp Thermocouple Flange.Fuses Replaced (← links)
- 05000341/LER-1986-048, :on 861226,during Calibr of Instrument Channel, Two Occurrences of RCIC & HPCI Being Inoperable Resulted. Caused by Personnel Error & Inadequate Communication. Personnel Involved in Incident Counseled (← links)
- 05000341/LER-1986-012, :on 860516,discovered Parts of RWCU Sys Temp Leak Detection Sys Did Not Meet Assumption in FSAR High Energy Pipe Break Evaluation.Caused by Engineering Personnel Error.Mod Prepared (← links)
- 05000341/LER-1987-008, :on 870301,power to Portions of Turbine Control Circuitry Lost Resulting in ESF Valve Isolation,Reactor Protection Sys Actuation & Reactor Scram.Caused by Personnel Error.Alarm Response Procedures Revised (← links)
- 05000341/LER-1988-035, :on 881004,automatic Scram Signal Generated During Shutdown.Caused by Control Room Operator Failure to Follow Procedures When Resetting Manual Scram Signal. Operator Counselled (← links)
- 05000341/LER-1987-002, :on 870226,tubine Tripped Initiating Reactor Scram.Caused by Aluminum Strip Used as Assembly Aid for iso- Phase Bus Cooling Duct,Breaking Free & Contacting y-phase Bus Causing Ground Fault.Relay Replaced (← links)
- 05000341/LER-1986-020, :on 860715,reactor Protection Sys,Nuclear Steam Supply Shutoff Sys & ECCS Logic Actuated During Inservice Leak Test.Caused by False Initiating Signal (← links)
- 05000341/LER-1998-008-01, Forwards LER 98-008-01,re Inboard Pressure Isolation Valve Which Did Not Meet Required Leakage Limits.Revised LER Documents One Previous Occasion Where Inboard Pressure Isolation Valve Did Not Meet Required Leakage Limits (← links)
- 05000341/LER-1986-008, :on 860331,during Implementation of Engineering Design Change to Drywell Sump Pumps,Discovered That Not All Tech Spec Surveillance Requirements for Primary Containment Sump Flow Monitoring Sys Addressed (← links)
- 05000341/LER-1986-007, :on 860404,control Ctr HVAC Sys Shifted from Normal to Recirculation Mode.Caused by Repairman Error During Independent Verification of Surveillance Test of Radiation Monitor HVAC Sys Restored (← links)
- 05000341/LER-1986-032, :on 860908,entry Into Fire Protection Tech Spec Action Statement Delayed.Caused by Cognitive Personnel Error.Hourly Fire Watch Posted,Personnel Counseled & Surveillance Test Procedures Corrected (← links)
- 05000341/LER-1986-027, :on 860831,valve Closed & Could Not Be Reopened During Monthly Operability Check.Caused by Equipment Failure Due to Corrosion.Corroded Disc & Shaft Replaced W/Stainless Steel Components (← links)
- 05000341/LER-1986-018, :on 860705,power to Reactor Bldg Ventilation Exhaust Gaseous Effluent Radiation Monitor Lost,Actuating Several ESF Sys.Disconnect Switch MCC 72B-4C Not Fully in on Position.Exact Cause Unknown (← links)
- 05000341/LER-1986-003, :on 860311,during Surveillance Test of Div II Isolation Logic,Rwcu Sys Isolated.Caused by Repairman Incorrectly Lifting Thermocouple Lead in Div I Isolation Logic.Personnel Counseled (← links)
- 05000341/LER-1986-016, :on 860530,computer Data Results in Calculated Pipe Stress & Support Reactions Misinterpreted.Engineering Changes Being Developed to Incorporate Piping Additions & Mods (← links)
- 05000341/LER-1986-014, :on 860516,while Refueling,Offsite Ac Power to Div 2 Interrupted,Causing half-scram.Caused by Personnel Procedural error.Half-scram Reset & Sys Restored (← links)
- 05000341/LER-1996-017-03, Forwards LER 96-017-03 Re Failure of SRVs to Open within Specified TS Required Tolerance.Revised Commitments Made by Util,Listed (← links)
- 05000341/LER-1986-013, :on 860513,10 of 15 RCS Safety/Relief Valves Failed Pressure Tolerance Surveillance Tech Spec Requirements.Cause Unknown.Valves Refurbished & Retested (← links)
- 05000341/LER-1986-010, :on 860423,NRC Inspector Discovered Tech Spec Surveillances Not Performed for Safety/Relief Valve lo-lo Setpoint.Caused by Inadequate Procedure for Updating Survtrac Schedule.Survtrac Program Corrected (← links)
- 05000341/LER-1988-018, :on 880503,operator Failed to Perform Shiftly Surveillance within Allowable Time.Caused by Personnel Error.Counselling Provided & Personnel Involved Disciplined (← links)
- 05000341/LER-1986-009, :on 860410,torus Water Mgt Sys auto-isolated During Removal of Test Equipment to Implement Drywell Floor Drain Sump Sys Design Change.Caused by Technician Error. Individual Counseled (← links)
- 05000341/LER-1988-004, :on 880110,north Reactor Feed Pump Speed Control Failed Resulting in Low Reactor Vessel Water Level. Caused by Overvoltage Trip for Power Supply.Failed Power Supply Replaced (← links)
- 05000341/LER-1999-002, :on 990518,RRP Trip Resulted in Manual Reactor Scram.Caused by Previous Actions Taken to Minimize Risk for RRP Trip Were Not Effective.Preventive Maint Activity to Change RRP MG Set Brushes Has Been Revised.With (← links)
- 05000341/LER-1998-011, :on 981014,cracking in Silicone Fire Barrier Penetration Seal Occurred Due to High Temps.Caused by Inappropriate Translation of Vendor Matl Info Into Penetration Seal Design.With (← links)
- 05000341/LER-1998-006, :on 980905,failure of MSIVs to Meet Local Leak Rate Acceptance Criteria Was Noted.Caused by Minor Scale on Seat & Poppet,Linear Indications & Indentations in Nose Cone Area.Repaired & Retested Valves (← links)
- 05000341/LER-1998-006-01, Forwards LER 98-006-01,providing Cause & Results of Repair or Rework & Testing for MSIVs Which Failed to Meet Specified Leakage Limits of TS 3.6.1.2 During Sixth RO (← links)
- 05000341/LER-1988-021, :on 880510,reactor Protection Sys High Pressure Scram Occurred 18 After Closure of Both Main Steam Bypass Valves.Caused by Faulty Relay.Relay Replaced.Mod to Alter Comparator Trip Circuits Planned (← links)
- 05000341/LER-1998-010, :on 981007,SRV as Found Settings Exceed TS Setpoint Tolerance Criteria.Caused by Oxide Bonding Between Pilot Valve Disc & Seat.All 15 Pilot Valve Assemblies Were Replaced.With (← links)
- 05000341/LER-1988-020, :on 880508,incorrect HPCI Surveillance Test Procedure Performed Causing Reactor Scram.Procedure Intended to Be Performed in Cold Shutdown or Refueling Condition. Procedure 24.202.04 Revised (← links)
- 05000341/LER-1988-019, :on 880507,offsite Power to Div 1 Interrupted When CRD Pump a Tripped on Loss of Power.Caused by Raccoon Climbing Sys Svc Transformer.Gravel Brought in to Bring Grade Above Fence Line (← links)
- 05000341/LER-1988-034, :on 880831,RWCU Outboard Isolation Valve G3352F004 Closed & Caused RWCU Pumps to Trip.Caused by Contacts 3-4 on Relay.Cause of Deenergization Under Investigation.Relays Replaced (← links)
- 05000341/LER-1988-017, :on 880427,control Ctr HVAC Shifted to Recirculation Mode Due to de-energization of Local Panel. Caused by Short in Panel When Burned Indicator Lamp Removed from Panel.Subj Lamp & Opened Fuse Replaced (← links)
- 05000341/LER-1988-033, :on 880822,RWCU Sys & Outboard Isolation Valves Automatically Closed Upon Receipt of High Differential Flow Isolation Signal.Caused by Steam Voiding in Sys at Pump Discharge Flow Element (← links)
- 05000341/LER-1988-016, :on 880420,closure of RHR Shutdown Cooling Outboard Isolation Valve Occurred.Caused by Failure of Agastat Relay A71B-K75.Relay & Fuse Replaced & Tested & Valve Returned to Normal Operation (← links)
- 05000341/LER-1988-008, :on 880229,determination Made During Local Leak Rate Testing That Combined Leakage Limits Exceeded.Caused by Normal Degradation of Valve Components &/Or Contaminants on Valve Seats.Valves Cleaned,Reworked & Retested (← links)
- 05000341/LER-1988-032, :on 880820 & 28,recirculation Pump B Discharge Valve Failed to Close.Caused by Torque Switch Being Set at Incorrect Value & Improperly Installed.Program That Controls Torque Switch Settings Will Be Improved (← links)
- 05000341/LER-1985-082, :on 851204,determined That Embedded Support Plates in Reactor Auxiliary Bldg Potentially Overloaded. Embedded Plates Acceptable,Based on Sargent & Lundy Analyses.Design Changes Do Not Affect Plates (← links)
- 05000341/LER-1998-009, :on 980914,inadvertent Deenergization of Safety Bus 72F While Transferring from Alternate to Normal Power Resulted in ESF Actuations.Caused by Personnel Error. Operator Involved Was Counseled.With (← links)
- 05000341/LER-1988-009, :on 880311,nine Safety Relief Valves Failed Pressure Surveillance Test.Cause of Failure Under Review by Site & Generically by BWR Owners Group Safety Relief Valve Set Point Drift Committee.Valves Cleaned (← links)
- 05000341/LER-1988-030, :on 880813,main Turbine on High Vibration of Bearings 8 & 9 Tripped.Caused When General Svc Water Flow Control Valve to Main Turbine Generator Lube Oil Coolers Failed Open.Failed Valve Repaired (← links)
- 05000341/LER-1988-031, :on 880815,accelerated Valve Stroke Time Testing of HPCI Discharge Isolation Valve E41-F067 Not Performed as Required.Caused by Personnel Error.Individual Involved Counseled (← links)
- 05000341/LER-1998-007, :on 980908,inadvertent Deenergization of Safety Buses During Performance of Surveillance Testing Resulted in ESF Actuations.Caused by Faulty Static Underfrequency Relay. Relay Was Removed & Benched Tested (← links)
- 05000341/LER-1998-005, :on 980904,unplanned Manual Reactor Scram Occurred in Response to Reactor Power Fluctuations.Caused by Spindle/Tongue Degradation of Number 3 Hpt Cv.Spindles, Tongues & Locking Plates Were Replaced on Subject Cvs (← links)
- 05000341/LER-1988-029, :on 880802,24 Hydraulic Control Unit Scram Inlet & Oulet Valves Opened Due to Deenergization of Associated Stated Valves.Caused by Improper Termination of Cable.Reactor Protection Sys Logic Reset (← links)
- 05000341/LER-1988-028, :on 880726,HPCI Pump Discharge Inboard Isolation Valve Failed to Open.Caused by Grounded Contactor Coil at Valve Torque Switch by Heater Bracket.Heater Assembly & Nine Other Valves Removed (← links)
- 05000341/LER-1988-027, :on 880726,technician Accidentally Shorted Across Two Terminals Which Actuated Div I of Emergency Equipment Cooling Water & Emergency Equipment Svc Water Sys. Caused by Personnel Error.Technician Counseled (← links)
- 05000341/LER-1988-025, :on 880719,breaker Tripped & Reactor Protection Sys Trip Sys B de-energized.Caused by Personnel Mishap.Event Will Be Included in Maint News Ltr & in Instrumentation & Controls Training Program (← links)
- 05000341/LER-1988-023, :on 880528 & 0713,RWCU Sys Manually Isolated by Operator Action.Caused by Separate Instrument Line Compression Failures.Instrument Lines Repaired & RWCU Sys Operating Procedures Revised (← links)
- 05000341/LER-1988-024, :on 880705,isolation of HPCI During Performance of Functional Test Occurred.Caused by Personnel Error. Surveillance Successfully Performed on Same Day & Accountability Meeting Held W/Individual (← links)
- 05000341/LER-1988-014, :on 880320,Div I Emergency Diesel Generators Inadvertently Started.Caused by Procedural Error.Revs Issued Which Corrected Sequence of Steps (← links)
- 05000341/LER-1996-017-02, Forwards LER 96-017-02,re Failure of Multiple SRVs to Open within TS Required Tolerance.Commitments Made within Ltr, Listed (← links)
- 05000341/LER-1997-004, :on 970304,calibr of Primary Containment Oxygen Monitor Was Noted in de-inerted Environ.Caused by Unanticipated Interaction of Sys Components.Troubleshooting & data-gathering Has Been Performed (← links)
- 05000341/LER-1997-004-01, Forwards LER 97-004-01 Re Calibration of Primary Containment Oxygen Monitor in de-inerted Environment Challenging Operability of Monitor in Inerted Environment (← links)
- 05000341/LER-1988-013, :on 880318,shutdown Cooling Was Lost Due to Closure of Suction Isolation Valve & Subsequent Tripping of RHR Pump.Caused by Procedural Inadequacies & Personnel Error.Sys Operating Procedures Will Be Revised (← links)
- 05000341/LER-1988-012, :on 880316,rack Isolation Valve for Reactor Protection Sys Channel C Drywell Pressure Instrument Found Closed.Caused by Failure to Fully Open Valve After 861016 Surveillance.Procedure 23.137 Revised (← links)
- 05000341/LER-1988-011, :on 880313,failure to Perform Shiftly Surveillance within Required Time Occurred.Caused by Failure to Designate Person to Perform Surveillance When Personnel Reassigned.Requirement Added (← links)
- 05000341/LER-1988-010, :on 880310,turbine Bldg Stationary Particulate, Iodine & Noble Gas Radiation Monitor Lost Power.Caused by Failure of Operations Personnel to Comply W/Requirement of Abnormal line-up Sheet (← links)
- 05000341/LER-1988-022, :on 880613,Div 2 Emergency Diesel Generators & Core Spray Pumps Actuated.Most Likely Caused by Personnel Error.Program Will Be Developed to Perform Periodic Audits of Personnel During Surveillance Procedure (← links)
- 05000341/LER-1988-006, :on 880229,unexpected Loss of RHR Shutdown Cooling Experienced After Transfer of Reactor Protection Sys B Power Supply.Appears That Operator Failed to Reset Valve Closure Logic After Transfer.Procedure Revised (← links)
- 05000341/LER-1988-007, :on 880214,deenergized Radiation Monitor Caused Control Ctr HVAC to Shift to Recirculation Mode.Caused by Improper Review of Sys Functions Prior to Performing Work. Personnel Involved Counseled on Event (← links)
- 05000341/LER-1997-013, :on 970619,HPCI Sys Isolation Valve Closed While Performing Surveillance.Caused by Apparent Spurious Closure of Relay Contact.Jumper Installed (← links)
- 05000341/LER-1994-004, :on 940822,discovered That Isolation Valves May Not Be Capable of Performing Their Function.Caused by Inadequate Control of Valve Actuator Settings.Controls Will Be Place to Ensure Settings Are Maintained (← links)
- 05000341/LER-1988-005, :on 880111,reactor Pressure Exceeded 150 Psig W/O HPSI Sys or RCIC Sys in Standby Lineup.Caused by Personnel Error.Individual Disciplined,Per Company Policy & Mgt Discussed Event W/Shift Supervisors (← links)
- 05000341/LER-1987-055, :on 871210,isolation of RCIC Sys Steam Line Occurred.Caused by Inadequacy in Sys Operating Procedure.Rev Made to Operating Procedure Which Directs Operator to Throttle Inboard & Outboard Isolation Valves (← links)
- 05000341/LER-1988-001, :on 880103,APRM Setdown Trips Found Outside Tech Spec Allowances.Caused by Inadequate Procedure.Aprm Setdown Trip Adjusted to Be within Tech Spec Range & Calibr Procedures Being Revised (← links)
- 05000341/LER-1987-054, :on 871217,isolation of Reactor Bldg Ventilation Occurred During Performance of Surveillance Testing.Caused by Equipment Inaccessibility.Blown Fuse Replaced & Actuations Reset (← links)
- 05000341/LER-1985-081, :on 851203,varying Indications of Bearing Surface Distress Found in Emergency Diesel Generator 11 During Insp.Caused by Upper Crankshaft Bearing Cap Misalignment.Cap Realignment Undertaken (← links)
- 05000341/LER-1986-004, :on 860210,requirement to Perform Inservice Insp for Emergency Equipment Cooling Water Sys Valve Deleted from Surveillance Procedure.Caused by Personnel Error.Review & Approval Process Modified (← links)
- 05000341/LER-1997-009, :on 970417,literal Wording of TS Requirement Had Not Historically Been Considered Prior to Proceeding Into Operational Conditions 1,2 & 3.Caused by Lack of Clarity in Ts,Ts Bases & Procedures.Revised Procedures (← links)
- 05000341/LER-1986-006, :on 860321,Div II Emergency Equipment Cooling Water & Emergency Equipment Svc Water Sys Automatically Started.Caused by Uncleared Undervoltage Signal on 4,160-volt Emergency Bus (← links)
- 05000341/LER-1997-012, :on 970603,voluntary Rept Re Surveillance Testing of Recirculation Sys Overspeed Stops Was Performed. Caused by Conflict Re TS SR 4.4.1.1.2.MG Set Mechanical & Electric Stops Adjusted Downward within 4.4.1.1.2 Limits (← links)
- 05000341/LER-1997-008, :on 970410,discovered Potential Common Mode Failure Mechanism for 480 Volt MCC Disconnect Switches Due to Not Being Fully Latched Due to Inadequate Maint.Cleaned & Lubricated Fused Disconnect Switches (← links)
- 05000341/LER-1997-005, :on 970307,RBCCW to EECW Return & Supply Isolation Valve Interlocks,Installed in EECW Makeup Tank Isolation Valve Circuit Between Dedicated Shutdown Panel & Opening Coil.Caused by Inadequate Design.Revised Procedures (← links)
- 05000341/LER-1997-003, :on 970303,EECW Sys Ci Function Was Outside Design Basis Due to Design Basis Deficiency.Eecw Sys Primary Containment Penetrations Have Been Modified to Provide Diverse Power (← links)
- 05000341/LER-1997-003-01, Forwards LER 97-003-01,which Documents Condition Outside Design Basis Related to EECW Sys Containment Isolation Function.Diverse Power Mod of Eecs Sys Primary Containment Penetrations Have Been Completed (← links)
- 05000341/LER-1997-011, :on 970507,condition Prohibited by Ts,Due to Turbine Stop Valve & Turbine Control Valve Missed Occurred. Caused by Failure to Recognize,During Development of Applicable Surveillance Procedures.Power Verified (← links)
- 05000341/LER-1985-083, :on 851219,power to Bus 1A of Reactor Protection Sys (RPS) Interrupted by RPS Electrical Protection Assembly Breaker Trip.Caused by Failure of Protection Logic Circuit Board.Board Replaced (← links)
- 05000341/LER-1997-010, :on 970504,HPCI Auxiliary Oil Pump Failed to Start.Caused by Failure of seal-in Contact in AOP Start Circuitry.Failed Auxiliary Contact Used for seal-in Purposes Has Been Replaced (← links)
- 05000341/LER-1985-070, :on 851012,discovered That Four Drywell Air Samples Invalid Due to Shutdown of Primary Containment Atmosphere Monitoring Sys.Caused by Failure to Verify Sample Pump & Associated Flow Path Inservice (← links)
- 05000341/LER-1985-078, :on 851121,RWCU Sys Primary Containment Inboard Isolation Valve Closed When Sys Operated W/O Supply of Cooling Water to Nonregenerative HXs During Maint & Mod Outage.Caused by Operator Error (← links)
- 05000341/LER-1985-068, :on 851001,reactor Feed Pump Turbine Tripped at Level 8 Setpoint After Pressure Drop Due to Opening of Turbine Bypass Valves.Caused by Discontinuity in Potentiometer.Potentiometer Replaced (← links)
- 05000341/LER-1985-065, :on 850928,reactor Water Cleanup Isolation Valves Closed & Pumps Tripped.Caused by Effects of Increasing Reactor Coolant Temp During Heatup.Instruments Recalibr.Isolation Alarm Modified (← links)
- 05000341/LER-1985-061, :on 850924,reactor Water Cleanup Sys Isolated. Caused by Incorrect Module Leads Being Lifted,Simulating High Temp Signal.Sys Isolated Again on High Differential Flow Signal Due to Flow Problems (← links)
- 05000341/LER-1985-030, :on 850701,at 2% Power,Reactor Scram Occurred. Caused by Procedural Error Resulting in Spurious Water Level 3 Signal Generation.Instrumentation & Control Technician Training Enhanced to Prevent Recurrence (← links)
- 05000341/LER-1985-077, :on 851110,during Performance of Operations Surveillance Procedure 24.203.04,auto-start Logic for Div II Emergency Diesel Generators Actuated.Caused by Removal of Test Module Jumper (← links)
- 05000341/LER-1985-076, :on 851109,emergency Diesel Generator 11 Auto Start Did Not Clear & Generator Would Not Shut Down During Dedicated Shutdown Sys Test.Caused by Misconfigured Contacts in Auxiliary Switch (← links)
- 05000341/LER-1985-025, :on 850614,reactor Water Cleanup Sys Isolated W/Plant in Operational Condition 4.Caused by Spurious Electrical Signals Associated W/Steam Leak Detection Fuse Reinstallation.Circuitry Delay in Design Stage (← links)
- 05000341/LER-1997-016, :on 961016,ESF Actuation Occurred Due to Loss of Power to DC Bus.Caused by Inadequate Procedure.Test 2A-2 Battery Successfully Completed,Supervisors & Test Crew Counseled & Procedure Revised (← links)
- 05000341/LER-1996-016-01, Forwards LER 96-016-01 Which Deals W/Esf Actuation (← links)
- 05000341/LER-1985-006, :on 850407,standby Gas Treatment Sys Div 1 & Associated Carbon Dioxide Fire Protection Sys Inoperable. Caused by Failure to Align Both Sys After Minor Mods. Procedure Revised (← links)
- 05000341/LER-1997-007, :on 970325,condition Prohibited by TS Due to Failure of Reactor Building Hvac.East RBHVAC Exhaust & Supply Fans Were Started in Order to Reestablish Secondary Containment Integrity & Failed Solenoid Valve Replaced (← links)
- 05000341/LER-1997-017, :on 961025,multiple SRVs as-found Settings Were Outside of one-percent Tolerance Allowance Confirmed to Be corrosion-induced Bonding of Pilot Valve Disc & Seat.Pilots Replaced During Extended Fifth Refueling Outage (← links)
- 05000341/LER-1996-017-01, Forwards LER 96-017-01,re Failure of Multiple SRVs to Open within Required TS Allowable Tolerance.Listed Commitments Included (← links)
- 05000341/LER-1985-053, :on 850824,ESF Actuated When Instrument Repairman Inadvertently Shorted 120 Volt Ac Power Supply. Caused by Repairman Error in Choosing Wrong Size Screwdriver.Fuse Replaced (← links)
- 05000341/LER-1996-020, :on 961203,loss of Shutdown Cooling Was Noted Due to ESF Actuation.Control Circuitry for Closure of Valve Investigated & All Connections Having Potential to de-energize Relay Checked (← links)
- 05000341/LER-1985-064, :on 851024,RWCU Steam Leak Detection Sys Inboard Isolated While Switching Battery Chargers.Probably Caused by Spurious Signal to Switching Div 1,130-volt Dc Battery Charger.Design Mod Installed (← links)
- 05000341/LER-1985-075, :on 851023,Div 1 Emergency Equipment Cooling Water & Svc Water Pumps Automatically Started.Caused by Operator Failure to Reset Digital Load Sequencer.Memo Issued to Personnel Re Procedure Requirements (← links)
- 05000341/LER-1985-048, :on 850724,reactor Bldg HVAC Failed to Start After Planned Trip.Hvac Exhaust Isolation Damper Reopened When Isolation Signal Reset Despite Exhaust Fan Trip. Response Procedure Revised (← links)
- 05000341/LER-1985-080, :on 851128,operator Failed to Place Radiation Monitor in Svc While Releasing Liquid Effluent.Caused by Operator Error & Supervisor Failure to Follow Procedures. Staff Counseled.Standing Order Issued (← links)
- 05000341/LER-1985-042, :on 850722,emergency Equipment Cooling & Svc Water Sys Automatically Started in Response to Low Differential Pressure Condition.Cause Undetermined (← links)
- 05000341/LER-1997-002, :on 970216,HPCI Sys Pump Discharge Valve Failed to Open.Caused by Failure of Pinion Gear Setscrew.Maint Procedure Controlling Work on Valve Mos Revised,Motor Shaft for Valve E4150-F006,spot Drilled & New Setscrew Installed (← links)
- 05000341/LER-1985-074, :on 851019,portion of Div II ECCS & Emergency Diesel Generator Relay Logic Actuated,Causing Core Spray Sys to Inject Water Into Reactor Pressure Vessel (← links)
- 05000341/LER-1997-001, :on 970206,error in Mass Flow Conversion Algorithm in Heat Methodology for Calculating Core Thermal Power Discovered.Caused by Deficiency in Calculation Software.Calculation Will Be Revised (← links)
- 05000341/LER-1985-072, :on 851013,shutdown Cooling Isolation Valve E11F008 Closed,Causing RHR Pump Trip,Closing RWCU Isolation Valve G33F004 & Tripping RWCU Pumps.Caused by Operator Pulling Fuses in Wrong Cabinet (← links)
- 05000341/LER-1985-052, :on 850818,Div II Reactor Bldg Pressure High/ Low Plan Received.Caused by Reactor Bldg Supply Airflow Being Too High.Airflow Reduced & Div II of Standby Gas Treatment Initiated to Restore Pressure (← links)
- 05000341/LER-1985-050, :on 850814,reactor Water Cleanup Sys Isolated. Caused by Spurious Actuation of Temp Switches in Reactor Water Cleanup Sys Steam Leak Detection Sys.Engineering Evaluating Sys to Prepare Design Change (← links)
- 05000341/LER-1985-046, :on 850813,reactor Water Cleanup Sys Isolated Due to High Differential Flow Signal.Caused by Effects of Changing Condenser Back Pressure.Flow Limited to 30 Gpm Max Until Basis for Calibr Reevaluated (← links)
- 05000341/LER-1985-049, :on 850814,Div 2 Emergency Diesel Generator 13 Automatically Started.Caused by Electrical Technician Inadvertently Shorting Adjacent Terminals,In Turn Shorting Generator Contact Wires.Procedures Revised (← links)
- 05000341/LER-1996-018, :on 961105,w/plant in Operational Condition 4 Reactor Head Stud 27 Inadvertently Detensioned During Trim Adjustments.Caused by Transposition Error in Elongation Data Sheet.Stud 27 Retensioned & Procedures Revised (← links)
- 05000341/LER-1985-044, :on 850726,Div II Control Ctr HVAC Supply Fan Shut Down for Insp.Fan Not Returned to Svc Until 2 Days After Expiration of 7-day Limiting Condition for Operation Due to Failure to Log Condition (← links)
- 05000341/LER-1985-047, :on 850729,valves Closed Causing Div I ECCS & Emergency Diesel Generators to Become Inoperable.Caused by Operator Error.No Corrective Action Required (← links)
- 05000341/LER-1996-015, :on 961015,ESF Actuation of Division 2 EECW Occurred During Fill & Vent Evolution of Portion of Sys Located in Drywell Due to Personnel Error.Licensed & non-licensed Operators Were Trained (← links)
- 05000341/LER-1996-008, :on 951213,one Megawatt Thermal Nonconservative Bias Found in Core Thermal Power Calculation.Caused by Heat Pump Seal Purge Flow Being Considered Insignificant During Original Heat Balance & Thermal Power Calculation (← links)
- 05000341/LER-1985-043, :on 850724,Div 1 Core Spray Mode Inoperable Due to Deenergization of RCIC Room Cooler T41-B021. Caused by Cooler Room Control Switch in Off Position. Cooler Returned to Normal (← links)
- 05000341/LER-1996-016, :on 961016,ESFA Occurred Due to Loss of Power to DC Bus.Revised Surveillance Procedure & Reviewed Event in 1997 Cycle 1 Electrical Maint Requalification Training.W/ (← links)
- 05000341/LER-1985-040, :on 850720,error Discovered in Surveillance Procedure While Performing Channel Function Test on Reactor Water Cleanup Sys Differential Flow Instrumentation.Caused by Omitted Procedure Rev.Procedure Modified (← links)
- 05000341/LER-1985-045, :on 850727,reactor Bldg HVAC Sys Tripped.Caused by Erratic Operation of Freezestat T41-N054B.Freezestat Switch Replaced w/like-for-like Switch (← links)
- 05000341/LER-1996-014, :on 961004,Div 2 UHS cross-connect Valve de-energized.Caused by Loose Set Screw on Valve Operator Spline bushing.Cross-connect Path Established & Valves Will Also Be Modified W/Set Screw Recess (← links)
- 05000341/LER-1996-013, :on 961004,determined Nonconservative Bias Existed for Calculating Core Thermal Power Due to Reactor Recirculation Pump Power Computer Point Scaling Error. Discrepancy Corrected (← links)
- 05000341/LER-1996-012, :on 961003,engineered Safety Features Actuation of Primary Containment Isolation Valve B3100f014A Occurred. Caused by Personnel Error.Incident Was Discussed with I&C Personnel in Tailgate Meeting (← links)
- 05000341/LER-1985-039, :on 850716,after Starting HPCI Sys to Perform Startup Test,Oil Leak Developed at Operator of Turbine Stop Valve.Caused by Loose Flange Between Pilot Valve Assembly & Valve Operator.Flange Bolts Tightened (← links)
- 05000341/LER-1996-024, :on 961228,automatic Reactor Scram Occurred Due to Perturbations in Reference Leg Backfill Sys While Placing Sys in Service.Procedures Revised (← links)
- 05000341/LER-1985-038, :on 850713,HPCI/RCIC Surveillance Tests Not Performed within 12 H Time Limit Prescribed by Tech Specs. Caused by Omission of Tests in General Operating Procedures. Procedural Deficiencies Corrected (← links)
- 05000341/LER-1985-037, :on 850711,surveillance Channel Check for Four Isolation Actuation Instruments Required by Tech Spec 4.3.2.1-1 Inadvertently Missed.Caused by Procedural Deficiency.Procedure Reviewed & Revised (← links)
- 05000341/LER-1993-003, :on 930106,TS Required Recorder Discovered Not to Be Qualified Due to Procedural deficiency.Non-qualified Recorder Installed in Main Control Room Div 2 Panel Replaced W/Qualified Recorder (← links)
- 05000341/LER-1996-023, :on 961224,TS Required shutdown-drywall to Suppression Chamber Vacuum Breaker Failed to Indicate Closed.Caused by Insufficient Detail in Maint Procedures. T2300F400J Vacuum Breaker Replaced (← links)
- 05000341/LER-1985-036, :on 850710,inboard & Outboard Primary Containment Isolation Valves Opened & Deenergized,Violating Tech Spec 3.6.3.Caused by Personnel Oversight.Event Discussed & Surveillance Procedures Altered (← links)
- 05000341/LER-1985-035, :on 850709,reactor Scram Occurred Due to Actual Reactor Water Level 3 Condition.Caused by Operator Not Recognizing Water Level Decrease & Failing to Respond to Alarm.Shift Supervisors Counseled (← links)
- 05000341/LER-1985-067, :on 850928,reactor Trip Occurred While Returning Jet Pump Developed Head Transmitter to Svc.Caused by Spurious Low Reactor Vessel Water Level 3 Signal.Common Leg Instruments Added to Valving Procedure (← links)
- 05000341/LER-1985-066, :on 850927,reactor Protection Sys Tripped on High Pressure Due to West Turbine Bypass Valve Closing. Caused by Noise Picked Up by Turbine Speed Pickup & Seen as Speed Signal.Gain Level Adjusted (← links)
- 05000341/LER-1985-063, :on 850920,reactor Water Cleanup Sys Isolated on High Differential Flow Signal.Caused by Pump Discharge Flow Transmitter Not Holding Calibr.Transmitter Replaced & Sys Placed in Bypass (← links)
- 05000341/LER-1985-062, :on 850909,intermediate Range Monitor Channels B & D Inoperable Due to Weekly Channel Functional Test Not Completed on Time.Caused by Staff Not Being Aware of Surveillance Time Limit.Test Completed (← links)
- 05000341/LER-1985-034, :on 850706,reactor Water Cleanup Sys Inboard & Outboard Primary Containment Isolation Valves Closed.Caused by Inadequate Instrument Loop Calibr Procedure.Procedure Revised.Loop Recalibr (← links)
- 05000341/LER-1985-032, :on 850704,inboard & Outboard Primary Containment Isolation Valves for Reactor Water Cleanup (RWCU) Sys Left Open W/Flow to RWCU Pumps & Breakers Deenergized.Caused by Personnel Error (← links)
- 05000341/LER-1985-031, :on 850703,outboard Isolation Valve of Reactor Water Cleanup Sys Closed.Caused by Spurious High Differential Temp Indication from Steam Leak Detection Circuitry.Isolation Reset & Sys Restarted (← links)
- 05000341/LER-1996-022, :on 961207,TS 3.3.7.5 Required Plant SD Occurred Due to Lack of Control Room Indication for Safety Relief Valve.Pressure Switch Sensing Tap for SRV a Relocated (← links)
- 05000341/LER-1985-028, :on 850627,Div I Reactor Water Cleanup Sys Inboard Isolation Valve Closed & Cleanup Sys Pumps Tripped. Caused by Spurious Steam Leak Detection Signal.Isolation Reset & Pumps Restarted (← links)
- 05000341/LER-1985-059, :on 850903,Group 1 Isolation Initiated High Pressure Trip.Caused by Exceeding Condenser High Pressure Setpoint During Sensing Line Refill.Condenser Pressure Instruments Recalib.Lines Will Be Monitored (← links)
- 05000341/LER-1985-058, :on 850831,Div I Emergency Equipment Cooling Water Sys & Associated Svc Water Sys Automatically Started. Cause Unknown.Recorder Installed to Track Differential Pressure in Closed Cooling Water Sys (← links)
- 05000341/LER-1985-056, :on 850826,determined That Leak Rate Test Not Performed After Maint on Div II Thermal Recombiner on 850620.Leak Test on 850829 Indicated Excessive Leakage. Caused by Damaged Gasket.Gasket Replaced (← links)
- 05000341/LER-1985-057, :on 850829,during Radiological Emergency Response Preparedness Drill,L H Roving Fire Watch Missed. Cause Unstated.Fire Watch Duties Reviewed W/All Personnel Assigned (← links)
- 05000341/LER-1996-021, :on 961204,automatic Reactor Scram on high-high Scram Discharge Volume During Shutdown Occurred. Caused by Personnel Error.Night Order Was Issued (← links)
- 05000341/LER-1985-054, :on 850827,HPCI Sys Isolated.Caused by Personnel Selecting Wrong Module Inside Panel.Diagrams Showing Locations & Identification of Switch Modules from Rear or Panel Added to Surveillance Procedures (← links)
- 05000341/LER-1985-055, :on 850828,HPCI Sys Isolation Logic Train a Tripped.Caused by Incorrect Output Due to Poor Connection Between Amplifier Card & Pins.Amplifier Board Reseated Securely (← links)
- 05000341/LER-1985-029, :on 850628,reactor Manually Scrammed in Response to Trip of Running CRD Pump.Caused by CRD Pump Trip Due to Low Suction Pressure Transient Occurring When Torus Water Mgt Sys Valve Opened (← links)
- 05000341/LER-1985-024, :on 850622,during Operational Condition 2, Reactor Water Cleanup Sys Isolated.Caused by False High Differential Flow Signal Being Out of Calibr.Instrumentation Recalibr (← links)
- 05000341/LER-1996-019, :on 961119,inoperable Standby Feedwater Sys Flow Path for 10CFR50,App R Application Discovered.Caused by Inadequate Design Review of App R Dedicated Shutdown. Operating Procedures Revised (← links)
- 05000341/LER-1985-027, :on 850617,outboard Primary Containment Isolation Valve G33F004 of Reactor Water Cleanup Sys Closed Causing Both Pumps to Trip.Cause Not Found.Valve Isolation Logic Reset (← links)
- 05000341/LER-1985-023, :on 850610,reactor Bldg Closed Cooling Water Pressure Differential Control Valve Went to Full Open Position.Caused by Dirt on Valve Controller Flapper & Nozzle.Controller Cleaned & Retested (← links)
- 05000341/LER-1996-011, :on 960928,ESF Actuation of Torus to Drywell Vacuum Breaker Occurred.Caused by Lack of Awareness on Part of Operator.Rhr Sys Operating Procedures Revised (← links)
- 05000341/LER-1985-014, :on 850501,reactor Protection Sys Actuation Occurred on Erroneous Indication at Reactor Vessel Level 3, Resulting in Full Scram & Isolation Signal for Valve Groups 4,13 & 15.Caused by Personnel Error (← links)
- 05000341/LER-1985-008, :on 850425,reactor Protection Sys Actuated Twice.Caused by False Upscale Trip Due to Bumping of Intermediate Range Monitor Cables.First Control Rod Valved Out.Second Control Rod Inserted Fully (← links)
- 05000341/LER-1985-010, :on 850427,reactor Protection Sys Tripped. Caused by APRM E Upscale Trip Due to Recorder Door Malfunction.Lprm Cables & Connectors Repaired & Chart Recorder Door Modified (← links)
- 05000341/LER-1985-009, :on 850426,CRD Friction Testing Performed W/O Reactor Protection Sys Shorting Links Being Removed,Per Tech Specs.Shorting Links Removed & Testing Continued.Tech Spec Change Will Be Requested (← links)
- 05000341/LER-1985-012, :on 850428,reactor Scrammed Twice During Installation of Reactor Protection Sys Shorting Links. Caused by Personnel Failure to Follow Written Procedures. Event Being Reviewed & Warning Signs Posted (← links)
- 05000341/LER-1985-011, :on 850427,two Reactor Protection Sys Actuations Occurred from Source Range Monitor Upscale Trips. Caused by radio-frequency Signal from Test Equipment. Procedure Revised to Prevent Reoccurrence (← links)
- 05000341/LER-1985-013, :on 850428,secondary Containment Integrity Not Established During Core Alterations for CRD Friction Test. Caused by Personnel Misunderstanding Applicability of Requirement.Procedure Change Initiated (← links)
- 05000341/LER-1985-021, :on 850607,reactor Protection Sys & ESF Actuations Occurred During Surveillance Testing of Reactor Vessel Pressure Instruments.Caused by Personnel Error. Procedure Revised (← links)
- 05000341/LER-1985-007, :on 850423,24 & 25,Tech Spec 3.3.7.11.b Violated Due to Grab Samples Not Taken within Required 8 H Period When Radiation Monitor Inoperable.Caused by Personnel Error.Personnel Counseled.Procedure Written (← links)
- 05000341/LER-1985-022, :on 850606,reactor Protection Sys Actuated. Caused by Movement of Test Signal Cable,Causing Transient to Produce half-scram Signal on Trip Sys a While Signal on Trip Sys B Present.Testing Minimized (← links)
- 05000341/LER-1985-026, :on 850615,emergency Equipment Cooling Water Sys Automatically Initiated When Third Pump Started.Caused by Bypass Valve Overshoot.Operating Procedure Revised to Place Sys in Override Prior to Switching Pumps (← links)
- 05000341/LER-1993-002, :on 930114,HPCI Sys Failed to Start on Simulated Auto Injection Signal During Performance of Surveillance.Caused by Loss of Supply Voltage to Governor Control sys.Voltage-dropping Resistor Replaced (← links)
- 05000341/LER-1985-020, :on 850604,discovery Made That Grab Samples of Reactor Bldg Ventilation Effluent Not Taken within 8 H of Failure of Reactor Bldg Ventilation Effluent Radiation Monitor.Caused by Personnel Error (← links)
- 05000341/LER-1993-001, :on 930104,HPCI Turbine Exhaust/Exhaust Drain Valve Did Not Fully Open.Caused by Coil in HPCI Turbine Exhaust Valve Open Relay Deenergized.Relay Replaced & Retested to Ensure Proper Function (← links)
- 05000341/LER-1992-007, :on 921028,two MSIVs Exceeded Administrative Allowable Leakage Rate During Periodic Leak Rate Testing. Caused by Normal Degradation of Valve Components &/Or Contaminants.Valves Repaired/Reworked (← links)
- 05000341/LER-1985-019, :on 850524,control Ctr HVAC Sys Switched to Emergency Recirculation Mode During Testing of Turbine Bldg HVAC Exhaust Radiation Monitor.Caused by Momentary Loss of or Disturbance in AC Power to Monitor (← links)
- 05000341/LER-1985-018, :on 850523,monthly Diesel Fuel Sample & Analysis for Particulate Contamination Discovered 15 Days Overdue.Caused by Failure to Update Chemistry Sampling Schedule.Schedule Corrected (← links)
- 05000341/LER-1985-005, :on 850408,while Restarting Reactor Vessel Water Level Instrument to Svc Following Calibr,Full Scram Signal Generated.Caused by Erroneous Reactor Vessel Water Level Signal Due to Pressure Transient (← links)
- 05000341/LER-1985-015, :on 850506,during Restoration of Reactor Vessel Level Instrument to Svc,Full Scram Signal Generated. Caused by Erroneous Level Indication Due to Incorrect Valving Technique.Valve Training Continuing (← links)
- 05000341/LER-1985-016, :on 850509,scram & Several Primary Containment Isolations Occurred.Caused by Improper Valving on Reactor Water Level Instrument.Personnel Counseled.Permanent Installation Planned (← links)
- 05000341/LER-1992-012, :on 921118,manual Scram Initiated Due to Loss of Feedwater After Heater Feed Pumps Tripped.Caused by Personnel Error.Emergency Procedures 102,103,104 & 105 Will Be Revised by 930131 (← links)
- 05000341/LER-1985-004, :on 850402,fire-rated Assembly Floor Plug & CO2 Suppression Sys Boundary Removed & Fire Watch Not Initiated within 1 H.Caused by Personnel Ignorance of Requirements & Unposted Floor Plugs (← links)
- 05000341/LER-1996-007, :on 960419,RCIC Sys Declared Inoperable Due to Turbine Shaft Gland Leakage.Caused by Steam Leakage Past Seat of RCIC Turbine Steam Admission Valve (← links)
- 05000341/LER-1985-003, :on 850403,after Calibr of Div II 48/24-volt Dc Battery Charger B-1,no Output Current Observed.Low Voltage Alarm Ignored Based on Belief That Problem Involved Spare Charger.Cause Unknown (← links)
- 05000341/LER-1996-010, :on 960719,ESF Actuation & HPCI System Suction Flow Path Transfer Occurred.Caused by Radio Frequency Interference.Posting of CST Instrument Panel and CST Area Completed & Work Request to Repair Phone Initiated (← links)
- 05000341/LER-1992-009, :on 921021,Wyle Labs Notified Util That Nine SRVs Exceeded TS Acceptance TS Tolerance of Plus or Minus 1% of Pressure Setpoint.Caused by Pilot disc-to-seat Sticking.Srv Pilot Assemblies Replaced (← links)
- 05000341/LER-1992-011, :on 921024,reactor Pressure Vessel Low Level Trips Occurred During Vessel Pressure Test.Caused by Bumpimg Instrument Rack.Barrier Will Be Installed Around Instrument Rack H21-P004 (← links)
- 05000341/LER-1985-002, :on 850328 & 31,loss of Power to Sys Svc Transformer Occurred,Resulting in Half Scram Signal & Isolation of Reactor Water Cleanup Sys.Caused by Ground Fault at Breaker A6.Duct Leak Repaired (← links)
- 05000341/LER-1985-001, :on 850328 & 31,reactor Protection Sys Div 1 Power Loss Occurred,Resulting in Reactor Scram.Caused by Ground Fault at Breaker A6.Breaker Replaced & Duct Leak Repaired W/Temporary Seal (← links)
- 05000341/LER-1992-010, :on 920918,auto-start Logic for All Station Air Compressors Lost When Modular Power Unit MPU-3 Deenergized. Caused by Personnel Error.Accountability Meeting Held to Address Event & AOP Revised (← links)
- 05000341/LER-1992-008, :on 920919,electrician Did Not Open Bus 65F Trip Cutoff Switch,Resulting in Deenergization of Bus.Caused by Personnel Error.Continuing Training for Operations & Electrical Maint Will Be Emphasized (← links)
- 05000341/LER-2020-001, Secondary Containment Inoperable Due to Both Airlock Doors Open (← links)
- 05000341/LER-1996-009, :on 960526,ESF Actuation Occurred.Caused by Plant Operator Attempting to Replace Burned Out Indicating Bulb,Cracked Socket Separated Completely,Resulting in Short Circuit.Lamp Socket Wires Taped (← links)
- 05000341/LER-1996-006, :on 960324,missed ASME Section 11 Required Surveillance Insp.Caused by Inadequate Review of Change in Inservice Testing Program.Check Valve Inspected & Relief Request VR-48 Revised (← links)
- 05000341/LER-1996-004, :on 960310,high Particulate Levels Found in EDG 11 Fuel Oil.Caused by Draining Day Tank Into Bottom of FOST Day Before Maint Creating Turbulence Near Sampling Point. Changed Out Fuel Oil in FOST for EDG 11 W/Fresh Fuel Oil (← links)
- 05000341/LER-1992-006, :on 920611,EECW Sys Automatically Initiated Due to Differential Pressure.Caused by Ineffective Communication Between Site Organizations.Sys Operating Procedure Revised to Only Allow Operation W/Two HXs in Svc (← links)
- 05000341/LER-1992-020, :on 911120,HPCI Sys Start Failure Occurred During Quarterly Surveillance Test.Caused by Egr Not Responding to Signal from EG-M Control Unit.Egr Replaced (← links)
- 05000341/LER-1992-005, :on 920603,determined That Standby Gas Treatment Sys Division 1 & 2 Inoperable.Caused by Relay 111CR Energized & Sealed in Hindering Start of Sgts.Visual & Physical Insp of Circuitry Performed (← links)
- 05000341/LER-1996-003, :on 960216,ECCS Outside Design Basis During ESF Bus 64C Undervoltage Protection Testing Occurred.Caused by Consequences of Bus 64C Udervoltage Testing Lineup.Dedicated Operator W/No Duties Stationed in CR (← links)
- 05000341/LER-1996-002, :on 960207,ESFA of Torus to Drywell Vacuum Breaker Occurred Due to Personnel Error.Enhanced TRS Procedure to Improve Human Factors Aspect of Using Procedure (← links)
- 05000341/LER-1992-004, :on 920508,I&C Technicians Were Removing Flow Indicator for Corrective Maintenance When Div II Eesws Started.Cause Determined by Improper Termination of Lug During Installation.Rework Done on Lug (← links)
- 05000341/LER-1992-003, :on 920407,vacuum Breaker Did Not Close After Being Opened.Caused by Actuator Binding Up with Actuator Cylinder in Open Position.Actuator Cylinder for Vacuum Breaker Replaced (← links)
- 05000341/LER-1992-002, :on 920316,inadvertent Actuation of LPCI Sys Loop Select Logic Occurred,Resulting in Core Flow Decrease & Entry Into Region a of Power/Flow Map.Caused by Short Circuit in Contacts.Meeting Held (← links)
- 05000341/LER-1995-007, :on 950928,TS Violation Occurred.Caused by Procedure Deficiency.Appropriate Surveillance Test Procedures Will Be Revised to Include Positive Verification (← links)
- 05000341/LER-1992-001, :on 920205,during Maintenance Calilbr of HPCI Temp Switch,Unplanned Breach of Oil Sys Pressure Boundary Occurred.Caused by Inadequate Documentation on Switch Installation Which Will Be Revised (← links)
- 05000341/LER-1991-022, :on 911211,primary Containmnt Negative Pressure Occurred During Plant Shutdown.Caused by Reverse Flow Through Safety Relief Valves.Staff Training Will Be Completed by First Quarter 1992 (← links)
- 05000341/LER-1991-021, :on 911127,control Ctr HVAC Shifted to Recirculation Mode During Performance of Surveillance Procedure.Caused by Personnel Error While Installing Test Switch.Procedures Revised Re Test Arrangement (← links)
- 05000341/LER-1991-020-01, :on 911120,HPCI Failed to Start During Performance of Surveillance.Caused by ERG Not Responding.Erg Replaced (← links)
- 05000341/LER-1991-019-01, :on 911120,reactor Water Cleanup Sys Isolation Occurred Due to High Pump Room Differential Temp & Personnel Error During Sys Restoration.Caused by Failure of Nonsafety Temp Switch.Temp Switch Recalibrated (← links)
- 05000341/LER-1995-006, :on 950602,main Turbine Trip Occurred Due to False Overspeed During Mechanical Overspeed Test.Revised Procedure 27.112.01 to Incorporate Holding Overspeed Reset Pushbutton Depressed at Least 15 Seconds (← links)
- 05000341/LER-1991-004, :on 910312,offgas Sys Sand Filter Differential Pressure High Alarm Annunicated,Causing Manual Reactor Scram.Caused by Broken Manifold Drain Line to Condenser. Temporary Supports Added to Piping Sys (← links)
- 05000341/LER-1995-005, :on 950425,reactor Tripped Due to High Neutron Flux.Caused by Reactor Pressure Transient.Tested Circuit Boards to Attempt Further Cause Determination to Component Level (← links)
- 05000341/LER-1995-004, :on 950409,unexpected Reactor Water Level 2 & ESF Actuations Occurred After Planned Scram.Caused by Selection of Parameters Used in Post Scram FW Logic Mod Per Engineering Design Package 9207 Installed During RF04 (← links)
- 05000341/LER-1991-017, :on 910813,valve Discovered Closed When Group 9 Primary Containment Isolation Logic for Valve Inadvertently Energized.Caused by Personnel Error.Required Reading Given to I&C Personnel (← links)
- 05000341/LER-1991-008, :on 910424,ESF Actuation Occurred During Performance of Reactor Pressure Vessel Level Transmitter Calibr.Caused by Trip Output Logic Switch in Wrong Position.Procedures Reviewed & Revised (← links)
- 05000341/LER-1995-003, :on 950228,unusual Event Declared & Terminated When Mode Switch Placed in Shutdown Completing Plant shut- Down in Accordance W/Tss.Caused by Gradual Draining Down of Div 2 Rwl.Performed Verification of Valves (← links)
- 05000341/LER-1991-013, :on 910601,safety Relief Valves Set Pressure Discovered Outside Tech Spec Limits.Caused Unknown. Spare Replacement Safety Relief Valves Refurbished,Cleaned & Retested & Certified to Be with Tolerance (← links)
- 05000341/LER-1991-014, :on 910601,ESF Actuation Occurred.Caused by Blown Fuse.Procedures Revised to Install Jumper Preventing Isolation Logic from Tripping & I&C Continuing Training Program Discussed (← links)
- 05000341/LER-1995-002, :on 950216,RCIC Turbine Exhaust Line Vacuum Outboard Isolation Valve E51-F062 Closed Due to Personnel Error.Relay E51K63 Replaced & Surveillance Procedure 44.020.235 Reperformed (← links)
- 05000341/LER-1995-001, :on 950211,wide Range Reactor Water Level Recorder Indicated 10 Inch Reactor Water Level Decreased Due to Inadequate Test Controls.Controlled Diagnostic Monitoring Instruments to Prevent Similar Conditions (← links)
- 05000341/LER-1994-011, :on 941123,erratic Indication Observed for Intermediate Range Monitor E During Testing of SRM C. Caused by Personnel Low Sensitivity of Significance.Screws Replaced & Tightened as Necessary (← links)
- 05000341/LER-1994-010, :on 941111,unplanned Automatic Isolation of Shutdown Cooling Occurred Due to Inadequate Review Prior to Authorizing I&C Surveillance.Individuals Involved in Event Counseled (← links)
- 05000341/LER-1994-009, :on 941110,unplanned Primary Containment Isolation of Torus Water Mgt Sys Occurred.Caused by Poor Communications & Failure to Adequately Monitor & Control Pump Out of Drywell Equipment Drain Sump (← links)
- 05000341/LER-1994-007, :on 941031,control Ctr HVAC Duct Hanger Improperly Installed.Caused by Engineering Design Change Process Error.Edp 26868 Revised to Have South Structural Channel Welded to Adjacent Structural Channels (← links)
- 05000341/LER-1991-018, :on 911002,discovered Error in TS Amend 75, Resulting in Failure to Complete One of Two Weekly Channel Calibr Requirements for APRM Sys Channels.Caused by Use of Deficient Process.Calibr Performed (← links)
- 05000341/LER-1991-010, :on 910519,control Room Emergency Filtration Sys Declared Inoperable When Charcoal Sample Not Taken After Structural Maint.Possibly Caused by Aging of Charcoal Filter.New Charcoal Absorber Installed (← links)
- 05000341/LER-1991-016, :on 910702,HPCI Sys Turbine Steam Supply Line Bypass Valve Discovered Inadvertently Closed Due to Failure of Breaker Rotary Switch.Rotary Switch Replaced & Accountability Meeting Held (← links)
- 05000341/LER-1991-015, :on 910627,reactor Scram Occurred Due to Overheating at Main Transformer 2A.Caused by Offsite Util Maint Personnel Reassembling Isophase Bus Housing Incorrectly.Instruction Revised (← links)
- 05000341/LER-1991-012, :on 910525,full Scram Signal Occurred.Caused by Damaged Fuse Holder.Damaged Fuse Holder in IRM G Replaced & Fuse Properly Seated (← links)
- 05000341/LER-1991-011, :on 910523,control Ctr HVAC Sys Shifted in Recirculation Mode.Caused by Spurious Spike of Radiation Monitor.Radiation Monitor Reset & Work Request Initiated (← links)
- 05000341/LER-1994-008, :on 941108,unrecognized Entry Into TS Action Statements Occurred.Caused by Poor Communication Among Entire Shift Team.Individuals Involved Counseled on Need to Specifically Review Applicable TS (← links)
- 05000341/LER-1991-009, :on 910429,loss of Power to Bus 65F Occurred Due to Mispositioned Knife Switch.Procedure 42.302.06 & Similar Electrical Surveillance Procedures Will Be Revised as Needed No Later than Sept 1991 (← links)
- 05000341/LER-1990-013, :on 901228,determined That Need for Isolation of Sampling Line in Event of LOCA Not Identified in Procedure & Primary Containment Integrity Could Be Compromised.New Sample Taps Added (← links)
- 05000341/LER-1991-007, :on 910414,error During Performance of Radiation Monitor Calibration Results in Actuation of Esf. Caused by Personnel Error.Personnel Counseled Re Event & Subject Procedure Revised (← links)
- 05000341/LER-1994-006, :on 940903,discovered That SRMs & IRMs Inoperable During Core Alterations.Caused by Cable Connectors Becoming Separated Due to Stress.Procedure 82.000.04 Will Be Modified (← links)
- 05000341/LER-1994-005, :on 940826,power Was Interrupted to Portion of Supply Shutoff Sys Control Logic Causing Actuations of Engineered Safety Feature Sys.Caused by Procedural Weakness. Procedures Revised (← links)
- 05000341/LER-1994-002, :on 940714,fifteen SRV Pilot Assemblies Were Removed During Fourth Refueling Outage.Caused by SRV Setpoint Pressure Upward Drift.All Fifteen SRV Pilot Assemblies Have Been Replaced (← links)
- 05000341/LER-1991-002, :on 910215,emergency Diesel Generators 11 & 13 Inoperable Due to Problems on Woodard Governor Motor Operated Potentiometers.Edg Have Been Tested,Examined & Maint Procedures Will Be in Effect (← links)
- 05000341/LER-1991-001, :on 910116,HPCI Inboard Steam Supply Valve E41-F002 Unexpectedly Closed During Surveillance.Caused by Malfunction of Transistor Q8 on Rosemount 510DU Trip Unit. Trip Unit Replaced (← links)
- 05000341/LER-1993-015, On 931226,valve B3105-F031B, B Loop Pump Discharge Valve,Failed to Fully Close.Caused by Broken Wires in Valve Yoke.Wiring Replaced (← links)
- 05000341/LER-1990-011, :on 901006,reactor Scram Occurred Due to Reactor Water Level Discrepancy (← links)
- 05000341/LER-1994-001, :on 940127,loss of Div I Power Occurred Due to Weather & Breaker Failure.Power Restored to Div I Utilizing Fermi-Custer & Fermi-Luzon Lines (← links)
- 05000341/LER-1990-008, :on 900905,HPCI Inadvertant Isolation Occurred. Caused by Spurious High Steam Flow Signal on One of Two Channels.Engineering Design Change Implemented to Filter Out Existing Background Noise from Output (← links)
- 05000341/LER-1993-014, :on 931225,automatic Reactor Shutdown Occurred Following Failure of Main Turbine.Caused by Loss of Material from Turbine Rotor in Low Pressure Section Number 3.Turbine/ Generator Repairs Will Be Determined (← links)
- 05000341/LER-1990-012, :on 901016,HPCI Steam Line Flow Transmitter Failure Occurred (← links)
- 05000341/LER-1990-010, :on 900718,during Performance of Surveillance 24.137.001, Main Steam Line Isolation Channel Functional Test, Operator Incorrectly Depressed Close Pushbutton Instead of Test Pushbutton,As Required (← links)
- 05000341/LER-1989-038, :on 891223,smoke Discovered in Vicinity of High Pressure Turbine & Reactor Manually Scrammed.Caused by Oil Soaked Lagging Pads Which Ignited When Oil Flash Point Reached.Damaged Insulation Pads Replaced (← links)
- 05000341/LER-1993-013, :on 930917,manual Reactor Scram Occurred Due to Failure to Follow Established Work Control Practices. Administered Discipline Per Plant Policy (← links)
- 05000341/LER-1993-012, :on 930906,HPCI Sys Suction Swap from Condensate Storage Tank to Torus Occurred.Caused by Discrepancies Between HPCI & Torus Water Mgt Sys Instrument. Calibr Performed on Torus Water Mgt Sys (← links)
- 05000341/LER-1990-009, :on 901002,determined That Loss of Shutdown Cooling & Safety Features Actuation Due to Breaker Tripping (← links)
- 05000341/LER-1990-001, :on 900108,blown Fuse in Testability Cabinet H21-P083 Caused Entry Into Tech Spec 3.0.3 (← links)
- 05000341/LER-1993-009, :on 930726,emergency Equipment Cooling Water Start During Svc Water Temperature Transient Due to Lack of Clear Labelling of Control Switch.Switch Labelled & Valve Deenergized to Prevent Unintentional Operation (← links)
- 05000341/LER-2019-006, Secondary Containment Pressure Exceeded Technical Specification Due to Reactor Building HVAC Damper Malfunction (← links)
- 05000341/LER-1993-008, :on 930518,discovered That Recorder T50-R802A Could Not Be Considered Operable Per TS 3.3.7.5.Caused by Personnel Error.Lessons Learned Will Be Incorporated Into Training Programs & Plant Procedures (← links)
- 05000341/LER-1993-007, :on 930420,reactor Tripped on Intermediate Range Monitor Upscale During Reactor Pressure & Feedwater Transient.Caused by Personnel Error.Affected Pressure Transmitters Replaced (← links)
- 05000341/LER-1990-002, :on 900202,determined That Area Radiation Surveillance Procedure 44.080.301 Listed Incorrect Values for Alarm Setpoints.Caused by Unavailable Setpoint Calculations.Procedure Revised (← links)
- 05000341/LER-1993-006, :on 930304,determined That Test Procedures Used to Perform Channel Functional Tests of RPS & Electrical Protection Assemblies Incorrect,Due to Defective Procedure. Procedures Will Be Revised by 930730 (← links)
- 05000341/LER-1993-005, :on 930225,burned-out Indicating Lamp Shattered During Replacement,Due to Inappropriate Selected Fuse Coordination.Design of Safety Related Control Power Circuits Will Be Reviewed for Proper Fuse Coordination (← links)
- 05000341/LER-1993-004, :on 930219,electrician Located & Connected Test Equipment to Incorrect Auxiliary Relay,Resulting in Loss of 4,160-volt Ac Bus 69J.Caused by Personnel Error.Training on self-checking & Trip Relays Held (← links)
- 05000341/LER-1990-004, :on 900404,RHR Sys Small Bore Connections Calculated to Experience Stress Above ASME Code III 1971 Code Requirements.Caused by Vibration Related Concerns.Welds Modified (← links)
- 05000341/LER-1990-007, :on 900829,control Ctr Ventilation Shifted to Recirculation Due to Blown Fuse.Caused by Design Deficiency in Div 1 & 2 Radiation Monitor Trip Circuitry.Design Change Implemented to Eliminate Trip Relay Logic (← links)
- 05000341/LER-1991-006, :on 910410,balance of Plant Breaker Opened Causing Reactor Bldg HVAC Isolation.Caused by Component Failures.Nprds Search Conducted for Similiar Problems (← links)
- 05000341/LER-1989-039, :on 891226,Div I Emergency Equipment Cooling Water & Svc Water Sys Automatically Started Due to Partial Load Shed of Bus 72E.Caused by Personnel Error. Accountability Meeting Held on 900117 (← links)
- 05000341/LER-1989-036, :on 891218,control Room Operator Inadvertently Depressed Closed Push Buttons on Inboard MSIVs A,B & C & Reactor Scram Resulted.Caused by Operator Error.Operator Involved Was Removed from Licensed Duties (← links)
- 05000341/LER-1989-034, :on 891208,review of Key Card Transactions Showed That Fire Watch Personnel Missed Assigned Hourly Fire Watch from 891020-1207.Fire Watch Person Discharged.Plan Re Improvement of Fire Watches Developed (← links)
- 05000341/LER-1989-030, :on 891026,Channel C Level 1 & 2 Replacement Transmitter Found to Be Installed Incorrectly & Condition Recognized on 891210,when Level 2 Trip Unit Was Reading Upscale.Caused by Personnel Error (← links)
- 05000341/LER-1989-035, :on 891210,steam Jet Air Ejectors Placed in Svc W/O Required Surveillance Completed & Required Grab Sample Not Started Until 891213.Caused by Personnel Error.Off Gas Sys Operating Procedure Will Be Revised (← links)
- 05000341/LER-1989-033, :on 891207,volt-ohm Meter Connected to Incorrect Terminal,Causing Div II of Emergency Equipment Cooling Water Sys to Actuate.Caused by Personnel Error.Sys Secured & Channel Test Successfully Completed (← links)
- 05000341/LER-1989-032, :on 891129,ESF Actuations Occurred During Set Up for Surveillance.Caused by Blown Fuse.Blown Fuse Replaced & Affected Sys Returned to Normal Operation Following Completion of Surveillance (← links)
- 05000341/LER-1989-037, :on 891220,determined That Tech Spec Stroke Time Testing for Outboard Reactor Water Sample Line Isolation Valve Not Performed.Caused by Personnel Error. Critique of Event Being Developed (← links)
- 05000341/LER-1989-031, :on 891120,both Div II Emergency Equipment Cooling Water (EECW) & Emergency Equipment Svc Water Sys Pumps Tripped Immediately.Caused by Inadequacies in Stated Procedures.Procedures Revised (← links)
- 05000341/LER-1989-025, :on 891115,low Level 2 Signal Unintentionally Induced During Reactor Pressure Vessel Hydrostatic Pressure Test.Caused by Personnel Error.Personnel Counseled on Notifying & Coordinating Instrument Lineups (← links)
- 05000341/LER-1989-029, :on 891023,half Scram Signal Received When Power Was Lost on Reactor Protection Sys Bus B,Resulting in Several ESFs Actuation.Caused by Location of Breaker Operating Switch in High Traffic Area (← links)
- 05000341/LER-1989-024, :on 891019,recognized That Secondary Containment Dampers Not Tested as Required by Tech Spec 3.6.5.2.Caused by Operations Personnel Error.Event Critique to Be Included in Required Reading Program (← links)
- 05000341/LER-1989-028, :on 891020,eight safety-related Valves Failed Set Pressure Test.Cause Under Review.All Valves Removed for Testing Being Refurbished,Cleaned,Retested & Recertified to Be within Plant Accepted Tolerances (← links)
- 05000341/LER-2019-005, Secondary Containment Pressure Exceeded Technical Specification Due to Reactor Building HVAC Damper Malfunction (← links)
- 05000341/LER-1989-022, :on 890923 & 24,reactor Protection Sys Logic Actuations Occurred When Fuse Blew.On 890928,reactor Bldg HVAC Isolated When Jumper Lifted Per Incorrect Work Plan Instruction.Caused by Personnel Error (← links)
- 05000341/LER-1989-027, :on 891015,reactor Bldg Hvac,Control Ctr HVAC & Drywell Floor & Equipment Drain Sumps Isolated & Standby Gas Treatment Sys & Noninterrruptalbe Control Air Compressors Started.Caused by Personnel Error (← links)
- 05000341/LER-1989-021, :on 890906,local Leak Rate Testing of Containment Isolation Valves & Penetrations Exceeded Tech Spec Limit.Caused by Excessive Containment Isolation Valve Leakage Due to Degradation of Valve (← links)
- 05000341/LER-1989-026, :on 891010,control Ctr HVAC Shifted to Recirculation Mode of Operaton Due to Short Circuit.Caused by Failure of Lamp Filament When Being Tightened.Fuse & Lamp Replaced & Sys Returned to Normal Operation (← links)
- 05000341/LER-1989-023, :on 890924,personnel Inadvertently Caused Trip of Essential Safety Sys Buses 64B & 64C.Caused by Failure of Personnel Involved to Review Applicable Prints Prior to Performing Test.Event Reviewed W/Personnel (← links)
- 05000341/LER-2019-003, Secondary Containment Declared Inoperable Due to Opening Both Airlock Doors (← links)
- 05000341/LER-2019-002, Secondary Containment Airlock Doors Opened at the Same Time Resulting in a Condition Prohibited by Technical Specifications (← links)
- 05000341/LER-2019-001, Unplanned Loss of Safety Function of Gland Seal Exhauster Trip During Planned Maintenance Due to Inadequate Procedure (← links)
- 05000341/LER-2018-007, Reactor Building to Suppression Chamber Vacuum Breaker Condition Prohibited by Technical Specifications (← links)
- 05000341/LER-2018-006, Emergency Diesel Generator Load Sequencer Inhibits Automatic Start of Residual Heat Removal Pumps Under Certain Scenarios Due to Unrecognized Original Design Defect (← links)
- 05000341/LER-2018-004, Re Inoperability of Reactor Water Cleanup System Isolation Differential Flow-High Function (← links)
- 05000341/LER-2018-005, Non-Functional Mechanical Draft Cooling Tower Fan Brakes Leads to HPCI Being Declared Inoperable and Loss of Safety Function (← links)
- 05000341/LER-2018-002, Loss of Division 1 Offsite Power Causes Partial Loss of Feedwater Leading to ECCS Injection and Reactor Scram (← links)
- 05000341/LER-2018-001, Regarding Secondary Containment Pressure Exceeded Technical Specification Due to Reactor Building HVAC System Manipulation (← links)
- 05000341/LER-1917-005, Regarding Non-Functional Mechanical Draft Cooling Tower Fan Brakes Leads to HPCI Being Declared Inoperable and Loss of Safety Function (← links)
- 05000341/LER-1917-004, Regarding Inadequate Procedural Guidance for Residual Heat Removal Complex Ventilation Systems Leads to Condition Prohibited by Technical Specifications and Loss of Safety Function (← links)
- 05000341/LER-1917-003, Regarding Division 2 Residual Heat Removal Service Water System (RHRSW) Inoperable Due to an Inoperable RHRSW Flow Control Valve (← links)
- 05000341/LER-2016-003, Cancellation of Licensee Event Reports (Lers) for Secondary Containment Wind Events: LER-16-003, LER 16-004, LER 16-007, Er 16-008, LER 16-010, LER 16-013; LER 16-014, LER 15-015, LER 16-016 and LER 16-017 (← links)
- 05000341/LER-2017-002, Regarding High Water Level Indications at Low Reactor Pressures Causes Some Functions of High Pressure Coolant Injection System and Reactor Core Isolation Cooling System to Be Inoperable (← links)
- 05000341/LER-2017-001, Regarding Loss of Reactor Protection System Scram Function During the Main Steam Isolation Valve and Turbine Stop Valve Channel Functional Tests Due to Use of a Test Box (← links)
- 05000341/LER-2016-017, Regarding Secondary Containment Pressure Exceeded Technical Specification During Reactor Building HVAC Restart Due to High Winds (← links)
- 05000341/LER-2016-016, Regarding Secondary Containment Pressure Exceeded Technical Specification Due to Adverse Weather (← links)
- 05000341/LER-2016-015, Regarding Secondary Containment Pressure Exceeded Technical Specification During Reactor Building HVAC Restart Due to High Winds (← links)
- 05000341/LER-2016-014, Regarding Secondary Containment Pressure Exceeded Technical Specification Due to Adverse Weather (← links)
- 05000341/LER-2016-013, Regarding Secondary Containment Pressure Exceeded Technical Specification Due to Adverse Weather (← links)
- 05000341/LER-2016-012, Regarding Unanalyzed Condition for Control Rod Drop Accident at Low Reactor Power (← links)
- 05000341/LER-2016-011, Regarding Standby Liquid Control Inoperable Due to Sodium Pentaborate Concentration Outside of Technical Specifications (← links)
- 05000341/LER-2016-010, For Fermi, Unit 2, Regarding Secondary Containment Pressure Exceeding Technical Specification Due to Adverse Weather (← links)
- 05000341/LER-2016-009, Regarding Emergency Diesel Generator Inoperable Due to Open Circuit on Loss of Power Instrumentation (← links)
- 05000341/LER-2016-008, Regarding Past Instances of Secondary Containment Pressure Exceeding Technical Specifications Due to Adverse Weather (← links)
- 05000341/LER-2016-007, Regarding Secondary Containment Pressure Exceeded Technical Specification Due to Adverse Weather (← links)
- 05000341/LER-2016-006, Regarding Inadequate Interpretation of Technical Specifications Related to Mechanical Draft Cooling Tower Fan Brake System Leads to Condition Prohibited by Technical Specifications, Loss of Safety Function, and Unanalyzed (← links)
- 05000341/LER-2016-005, Regarding Secondary Containment Pressure Exceeded Technical Specification Due to Reactor Building HVAC Restart During High Winds (← links)
- 05000341/LER-2016-004, Regarding Secondary Containment Pressure Exceeded Technical Specification Due to Adverse Weather (← links)
- 05000341/LER-2015-006-01, Regarding Reactor Scram Due to Loss of Turbine Building Closed Cooling Water (← links)
- 05000341/LER-2015-009, Regarding Condition Prohibited by Technical Specification Due to Missed Entry Into LCO Condition (← links)
- 05000341/LER-2015-008, Regarding Turbine Stop Valve Closure and Turbine Control Valve Fast Closure Reactor Protection System Functions Considered Inoperable Due to Open Turbine Bypass Valve (← links)
- 05000341/LER-2016-002, Regarding Both Residual Heat Removal Low Pressure Coolant Injection Divisions Inoperable Due to Inoperable Injection Valve (← links)
- 05000341/LER-2015-005-01, Regarding Secondary Containment Inoperable Due to RBHVAC Damper Malfunction (← links)
- 05000341/LER-2016-001, Regarding Turbine Stop Valve Closure and Turbine Control Valve Fast Closure Reactor Protection System Functions Considered Inoperable Due to Open Turbine Bypass Valves (← links)
- 05000341/LER-2015-007, Regarding Operation with the Potential to Drain the Reactor Vessel with Secondary Containment Inoperable (← links)
- 05000341/LER-2015-006, Regarding Reactor Scram Due to Loss of Turbine Building Closed Cooling Water (← links)
- 05000341/LER-2015-005, Regarding Secondary Containment Declared Inoperable Due to RBHVAC Damper Malfunction (← links)
- 05000341/LER-2015-004, Regarding Secondary Containment Declared Inoperable Due to Reverse Rotation of Normal Exhaust Fan During Post-Maintenance Testing (← links)
- 05000341/LER-2015-003, Regarding Oscillation Power Range Monitor Upscale Reactor Scram During Single Loop Operation (← links)
- 05000341/LER-2015-002, Regarding Loss of Both Divisions of the Residual Heat Removal Low Pressure Coolant Injection Functions Due to 480 Volt Swing Bus Inoperable (← links)
- 05000341/LER-2015-001, Regarding Secondary Containment Declared Inoperable After Loss of Reactor Building Ventilation from Freeze Protection Actuation (← links)
- 05000341/LER-2013-004, Regarding Condition Prohibited by Technical Specifications for 480 Volt Bus Inoperable Due to Failed Voltage Regulator (← links)
- 05000341/LER-2013-003, Regarding Loss of Secondary Containment Function Due to Exceedance of Technical Specification Required Vacuum Pressure (← links)
- 05000341/LER-2013-002, Regarding Reactor Core Isolation Cooling Isolation Instrumentation Misconfigured Wiring (← links)
- 05000341/LER-2013-001, Regarding Loss of Secondary Containment Function (← links)
- 05000341/LER-2012-006, Regarding Manual Reactor Scram Due to Hydrogen Leakage Into the Stator Water Cooling System (← links)
- 05000341/LER-2012-005, Regarding Reactor Scram Due to Loss of 120 Kv Power (← links)
- 05000341/LER-2012-004, Regarding Operation or Condition Prohibited by Technical Specification 3.3.3.1 (← links)
- 05000341/LER-2012-003, Regarding Reactor Scram Due to Degrading Condenser Vacuum (← links)
- 05000341/LER-2012-002, Regarding Reactor Scram During Reactor Pressure Vessel Hydrostatic Test (← links)
- 05000341/LER-2012-001, Regarding Loss of Shutdown Cooling Due to a Voltage Transient (← links)
- 05000341/LER-2011-001, Regarding High Pressure Coolant Injection System Inoperable Due to Inoperable Minimum Flow Valve (← links)
- 05000341/LER-2010-004, High Pressure Coolant Injection System Inoperable Due to Inoperable Minimum Flow Valve (← links)
- 05000341/LER-2010-003, Automatic Reactor Scram Due to Degraded Condenser Vacuum (← links)
- 05000341/LER-2010-002, For Fermi 2, Regarding Automatic Reactor Scram and Loss of Offsite Power Due to Severe Weather (← links)
- 05000341/LER-2010-001, For Fermi 2, Regarding Automatic Reactor Shutdown Due to Generator Current Transformer Wiring Failure (← links)
- 05000341/LER-2009-002, Manual Reactor Scram Due to Hydrogen Leakage Into the Stator Water Cooling System (← links)
- 05000341/LER-2009-001, Regarding Manual Reactor Scram in Response to High Turbine Vibration (← links)
- 05000341/LER-2008-005, Regarding Loss of High Pressure Coolant Injection System Safety Function Due to Closure of Steam Supply Valve (← links)
- 05000341/LER-2008-004, Relay Locking Straps Not Fully Engaged (← links)
- 05000341/LER-2008-003, Control Center Pressure Boundary Door Blocked Open (← links)
- 05000341/LER-2008-002, Regarding Secondary Containment to Suppression Chamber Vacuum Breaker Functionality (← links)
- 05000341/LER-2008-001, Re Manual Reactor Scram in Response to a Trip of Both Reactor Recirculation Pumps (← links)
- 05000341/LER-2007-002, Automatic Initiation of Alternate Rod Insertion and Manual Reactor Scram Due to Perturbations in the Reference Leg Backfill System (← links)
- 05000341/LER-2007-001, Regarding Excessive Feedwater Check Valve Leakage at Containment Penetration (← links)
- 05000341/LER-2006-004, Emergency Diesel Generators Out of Service Due to Undersized Control Power Transformers (← links)
- 05000341/LER-2006-003, Regarding Automatic Reactor Shutdown Due to Loss of Division 1 Power (← links)
- 05000341/LER-2006-002, Regarding Automatic Reactor Shutdown Due to Main Unit Transformer Failure (← links)
- 05000341/LER-2006-001, Re Excessive Feedwater Check Valve Leakage at Containment Penetration (← links)
- 05000341/LER-2005-006, Re Potential Fire Scenario Affecting Opposite Division Emergency Diesel Generators (← links)
- 05000341/LER-2005-005, Regarding Potential Loss of Standby Feedwater Pumps Due to Lack of Fuse Coordination (← links)
- 05000341/LER-2005-004, Regarding Both Residual Heat Removal Low Pressure Coolant Injection Divisions Inoperable Due to Valve Failure (← links)
- 05000341/LER-2005-003, Re Design and Operating Procedure Deficiencies Related to Appendix R Events (← links)
- 05000341/LER-2005-002, Regarding Combustion Turbine Generator 11-1 Unable to Perform as Designed During Certain Appendix R Scenarios (← links)
- 05000341/LER-2005-001, Regarding Manual Reactor Shutdown Due to Containment Cooler Leak (← links)
- 05000341/LER-2004-004, Re Automatic Reactor Shutdown Due to Automatic Voltage Regulator Failure (← links)
- 05000341/LER-2004-003, Regarding Standby Liquid Control Pump Inoperable Due to Inadequate Lubrication (← links)
- 05000341/LER-2004-002, Re Automatic Reactor Shutdown Due to Automatic Voltage Regulator Failure (← links)
- 05000341/LER-2004-001, Regarding Technical Specification Required Shutdown Due to Emergency Diesel Generator Failure (← links)
- 05000341/LER-2003-004, Regarding EDG 12 Lube Oil Pressure Low (← links)
- 05000341/LER-2003-003, For Fermi 2 Re Non-Conservative Setpoints for Stability Option III (OPRM) Period Based Detection Algorithm, Period Confirmation Adjustable Variables (← links)
- 05000341/LER-2003-002, Re Automatic Reactor Shutdown Due to Electric Grid Disturbance and Loss of Offsite Power (← links)
- 05000341/LER-2003-001, Loss of High Pressure Coolant Injection Safety Function Due to Closure of Steam Supply Valve (← links)
- 05000341/LER-2002-005, Regarding Non-Conservative Setpoint for Stability Option III (OPRM) Period Based Algorithm-Tmin (← links)
- 05000341/LER-2002-004, From Fermi 2 Regarding Reactor Scram Due to Loss of Condenser Vacuum on October 2, 2002 (← links)
- 05000341/LER-2002-003, Title Breaching of Control Room Emergency Filtration (CREF) System Ductwork Integritiy (← links)
- 05000341/LER-2002-002, Re Fire Protection Dedicated Shutdown Valve Accessibility Impacted by Field Modification (← links)
- 05000341/LER-2002-001, Re HPCI and RCIC Room Area Temperature Switches Beyond TS Allowable Value (← links)
- 05000341/LER-2001-004, Re Manual Reactor Scram Due to Loss of Stator Water Cooling (← links)
- 05000341/LER-2023-003, Reactor Pressure Boundary Leakage at Socket Weld on Reactor Recirculation Sample Line Caused by Fatigue Failure (← links)
- 05000341/LER-1996-001, :on 960205,EDG CW Function Potentially Lost Due to Ice Formation in Pump Columns.Performed Operability Determination on Dgsw Pumps B & C (← links)
- 05000341/LER-2025-001, Division 1 Transformer 64 Load Tap Changer Failure Potenially Prohibited by Technical Specifications and Potential Loss of Safety Function (← links)
- 05000341/LER-2025-001-01, Cancellation of Licensee Event Report LER 2025-001-01, Div. 1 Transformer 64 Load Tap Changer Failure Potentially Prohibited by Technical Specifications and Potential Loss of Safety Function (← links)
- 05000341/LER-1995-006, :on 950602,main Turbine Trip Occurred Due to False Overspeed During Mechanical Overspeed Test.Revised Procedure 27.112.01 to Incorporate Holding Overspeed Reset Pushbutton Depressed at Least 15 Seconds (← links)
- 05000341/LER-1995-005, :on 950425,reactor Tripped Due to High Neutron Flux.Caused by Reactor Pressure Transient.Tested Circuit Boards to Attempt Further Cause Determination to Component Level (← links)
- 05000341/LER-1995-001, :on 950211,wide Range Reactor Water Level Recorder Indicated 10 Inch Reactor Water Level Decreased Due to Inadequate Test Controls.Controlled Diagnostic Monitoring Instruments to Prevent Similar Conditions (← links)