Pages that link to "05000498/LER-2014-001, Regarding Overpower Condition Relating to the Ultrasonic Flow Measurement System"

The following pages link to 05000498/LER-2014-001, Regarding Overpower Condition Relating to the Ultrasonic Flow Measurement System:

Displayed 6 items.

• 05000498/LER-2014-001 (redirect page) ‎ (← links)
  • 05000498/LER-2001-002 ‎ (← links)
  • 05000498/LER-2001-001 ‎ (← links)
  • 05000498/LER-1989-017, Informs NRC of Change to Commitment Made as Result of LER 89-017 Re Event Involving Inadvertent Contamination of Nonradioactive Sys on 890814.Mods 89228,89229,89239 & 89231 No Longer Necessary.Justification Included ‎ (← links)
  • 05000498/LER-1992-005, Responds to Violations Noted in Insp Repts 50-498/92-15 & 50-499/92-15.Corrective Actions:Written Policy Developed to Emphasize That Safety Equipment Manipulations Must Be Governed by Guidance.Response Taken from LER 92-005 ‎ (← links)
  • 05000498/LER-1992-007, Errata to LER 92-007-00:on 920710,correcting Typo on Page 3 of 920807 Initial Submittal,Revising Cause of Vent to Cause of Event ‎ (← links)
  • 05000498/LER-1988-004, Forwards LER 88-004-00 Re 880110 ESF Actuation Due to Loose or Corroded Toxic Gas Monitor Computer Board Electrical Connection.Suppl to LER Will Be Submitted Upon Completion of Evaluation of Root Cause by 880309 ‎ (← links)
  • 05000498/LER-1999-003, Forwards LER 99-003-00,re Unit 1 CR HVAC Being Placed in Filtered Recirculation Mode of Operation Instead of Recirculation & make-up Filtration Mode.Commitments Made by Util Are in Corrective Action Section of LER ‎ (← links)
  • 05000498/LER-1999-002, Forwards LER 99-002-00,re Inadequate Performance of TS Surveillance When Evaluating Source Range Nuclear Instrument Discriminator Bias Curve Results.Corrective Action Section of LER Lists Commitments ‎ (← links)
  • 05000498/LER-1999-001, Forwards LER 99-001-00,re RHR Sys Being Outside Design Basis.Commitments Made Are Found in Corrective Action Section of Attachment ‎ (← links)
  • 05000498/LER-1998-001, Forwards LER 98-001-00 Re Failure to Perform an Adequate TS Surveillance Re Containment Structural Integrity.Licensee Commitments Are Found in CA Section ‎ (← links)
  • 05000498/LER-1988-016, Forwards LER 88-016-00 in Response to NRC Re Violations Noted in Insp Rept 50-498/88-01 Concerning Feedwater Flow Transmitters.Violation Fully Addressed as LER Subj.Corrective Actions Completed & Reviewed by NRC ‎ (← links)
  • 05000498/LER-2024-004, Loss of Offsite Power Resulting in Unit 1 Automatic Reactor Trip and Actuation of Emergency Diesel Generators and Auxiliary Feedwater Pumps ‎ (← links)
  • 05000498/LER-2024-003, Condition Prohibited by Technical Specifications and Potential Loss of Safety Function Due to Inoperable Low Head Safety Injection Pump ‎ (← links)
  • 05000498/LER-2024-002-01, Two Essential Chilled Water Trains Inoperable Resulting in a Condition That Could Have Prevented Fulfillment of a Safety Function ‎ (← links)
  • 05000498/LER-2023-003-01, Two Essential Chilled Water Trains Inoperable Resulting in a Condition That Could Have Prevented Fulfillment of a Safety Function ‎ (← links)
  • 05000498/LER-2023-004-01, Condition Prohibited by Technical Specifications Due to Inoperable Train of Essential Chilled Water ‎ (← links)
  • 05000498/LER-2024-001, Re Two Steam Generator Power Operated Relief Valves (Porvs) Inoperable Resulting in a Condition That Could Have Prevented Fulfillment of a Safety Function ‎ (← links)
  • 05000498/LER-2023-004, Condition Prohibited by Technical Specifications Due to Inoperable Train of Essential Chilled Water ‎ (← links)
  • 05000498/LER-2023-003, Two Essential Chilled Water Trains Inoperable Resulting in a Condition That Could Have Prevented Fulfillment of a Safety Function ‎ (← links)
  • 05000498/LER-2023-001-01, Supplement to Pressurizer Power Operated Valve Failed to Open ‎ (← links)
  • 05000498/LER-2023-001, Pressurizer Power Operated Relief Valve Failed to Open ‎ (← links)
  • 05000498/LER-2021-001, Frozen Common Sensing Line Results in Loss of Two Main Feedwater Pumps Leading to Automatic Reactor Protection and Auxiliary Feedwater Systems Actuations Due to Low Steam Generator Level ‎ (← links)
  • 05000498/LER-1998-004, :on 980430,entry Into TS 3.0.3 for Inoperable Fuel Handling Bldg Exhaust Ventilation Sys Occurred.Caused by Inadequate Plant Design Which Does Not Support Motor Repairs in AOT W/O Shutting Down Plant.Performed Maint ‎ (← links)
  • 05000498/LER-1989-015-01, :on 890704,main Generator Output Circuit Breaker Opened Resulting in Reactor Trip.Caused by Failure of 125-volt Dc Generator Circuit Breaker Trip Circuit. Failed Relay Replaced ‎ (← links)
  • 05000498/LER-1997-009, :on 970902,MSSVs 7430A & 7430B Found W/Lift Settings Outside TS Allowable Tolerance as Listed.Caused by Alteration of Nozzle & Disc Oxide Layers.Lift Setting of out-of-tolerance Valves Will Be Adjusted ‎ (← links)
  • 05000498/LER-1989-014-01, :on 890620,discovered That Maint Activity Performed on Essential Chiller 12C Rendered Standby Diesel Generator 13 Incapable of Being Tied to 4.16 Kv ESFs Bus. Caused by Improper Work Instructions ‎ (← links)
  • 05000498/LER-1989-010-01, :on 890327,discovered That post-maint Stroke Time Test of Charging Pump Recirculation Valve Not Performed.Caused by Personnel Error.Night Orders Issued Re Importance of Operability Tracking Log ‎ (← links)
  • 05000498/LER-1989-011, :on 890412,actuation of Control Room Ventilation to Recirculation Mode Occurred.Caused by Inadequate Flow of Nitrogen Ref Gas Due to Design of Sys. Nitrogen Supply Will Be Upgraded ‎ (← links)
  • 05000498/LER-1989-007, :on 890208,operational Test for Gaseous Waste Processing Sys Oxygen Analyzer Exceeded Surveillance Period. Caused by Personnel Error.Monthly Analog Channel Operational Test Performed & Procedure for Shift Revised ‎ (← links)
  • 05000498/LER-1989-013-01, :on 890607,unplanned ESF Actuation of Fuel Handling Bldg HVAC Sys to Filtered Exhaust Mode Occurred. Caused by Personnel Error.Technicians Counseled on Radiation Monitoring & Bulletin Issued ‎ (← links)
  • 05000498/LER-1989-002, :on 890106,discovered That Containment Electrical Penetrations Not Provided W/Backup Overcurrent Protection.Caused by Design Errors.Backup Protective Devices to Be Installed on Circuits.Part 21 Related ‎ (← links)
  • 05000498/LER-1989-016-01, :on 890713,discovered That Rod Position Deviation Monitor Not Capable of Alarming in Control Room Since 890511.Caused by Inadequate Procedural Control of Design Rev to Computer Software ‎ (← links)
  • 05000498/LER-1989-009, :on 890227,discovered That RCS Primary Sampling Sys Outside Containment Isolation Valve Not Tested for Proper Stroke Time Following Repair of Leak.Caused by Inadequate Instructions.Procedure Revised ‎ (← links)
  • 05000498/LER-1988-063, :on 881129,determined That Vortex Breakers Not Installed in Containment Emergency Sumps.Caused by Failure to Complete Installation Prior to Licensing.Vortex Breakers Installed in Both Units ‎ (← links)
  • 05000498/LER-1989-012-01, :on 890506,operation of Control Room Ventilation Sys in Violation of Tech Specs.Caused by Operator Error.Personnel Counseled & Training Initiated.W/ ‎ (← links)
  • 05000498/LER-1998-005, :on 980806,noted Failure to Meet Requirements of TS Surveillance 4.5.1.1 for Verifying ECCS Accumulator Volume & Pressure.Caused by Programmatic Problems in Setpoint Program at Stp.Established Temporary Logs in CRs ‎ (← links)
  • 05000498/LER-1987-014, :on 871113,control Room Ventilation Actuation to Recirculation Mode Occurred.Caused by Toxic Gas Monitor Detection of Paint Fumes Containing Gases.Painting Suspended & Painting Control Procedure Will Be Revised ‎ (← links)
  • 05000498/LER-1987-020, :on 871128,control Room Ventilation Actuated to Recirculation Mode.Caused by Toxic Gas Monitor Computer Chip Failure.Computer Chip Replaced & Monitor Restored to Normal Operation ‎ (← links)
  • 05000498/LER-1987-018, :on 871124,cooldown Initiated Due to Inoperability of Two Trains of Containment Spray.Crack in Pipe Connection of Train a Caused by Design Error.Mod to All Trains of Emergency Cooling Water Planned ‎ (← links)
  • 05000498/LER-1987-019, :on 871124,determined That Continuity of Slave Relay Contact in Train a of Containment Spray Sys Improperly Tested.Caused by Personnel Error.Relay Tested & Procedures for Testing Relays in Trains B & C Reviewed ‎ (← links)
  • 05000498/LER-1987-017, :on 871124,discrepancy Between Tech Spec Pressurizer Low Pressure Safety Injection Setpoint & Actual Setpoint Identified.Caused by Procedural Error.Surveillance Procedures & Setpoints Corrected ‎ (← links)
  • 05000498/LER-1987-015, :on 871121,cooldown Initiated Due to Inoperability of Essential Chiller Units 11C & 12A.Caused by Inadequate Protection of Equipment Controls.Caution Tags Posted & Operator Logs Revised ‎ (← links)
  • 05000498/LER-1997-010, :on 970920,discovered That MSSV Was Not Meeting Required Relief Capacity.Caused by Inadequate Resolution of Issues Re Valve Assembly During Unit 1 Sixth Refueling Outage.Revised MSSV Reassembly Procedure ‎ (← links)
  • 05000498/LER-1997-010-01, Forwards LER 97-010-01 Re Discovery of MSSVs Not Meeting Required Relief Capacity.Event Did Not Have Adverse Effect on Health & Safety of Public.Corrective Actions Listed in Attachment to Ltr Are Only Licensing Commitments i ‎ (← links)
  • 05000498/LER-1987-012, :on 871102,high Head Safety Injection Sys Cold Leg Injection Valves Closed.Caused by Inadequate Training & Personnel Error.Mgt Reemphasized Proper Use of Procedures, Annunciators & Attention to Details ‎ (← links)
  • 05000498/LER-1998-003, :on 980706,licensee Failed to Meet Requirements of TSs Due to Inoperable CR Mu & Cleanup Filtration Sys Exceeding Aot.Caused by Inability to Maintain Haldide Detector Instrument.Developed Calibration Technique ‎ (← links)
  • 05000498/LER-1987-013, :on 871102,control Room Ventilation Actuation to Recirculation Mode Due to Inadvertent Switch Operation. Caused by Personnel Error.Const Personnel Reinstructed & Caution Tag Added to Disconnect Switch ‎ (← links)
  • 05000498/LER-1987-011, :on 871017,actuation of Control Room Ventilation to Recirculation Mode Occurred.Caused by Failure of Toxic Gas Monitor Printed Circuit Board.Board Replaced & Monitor Restored to Normal Operation ‎ (← links)
  • 05000498/LER-1987-010, :on 870926,fuel Handling Bldg Ventilation Sys auto-actuation to Filtration Mode Occurred.Caused by Failure of Radiation Monitor.Monitor Input/Output & Preamplifier Printed Circuit Boards Replaced ‎ (← links)
  • 05000498/LER-1989-008, :on 890212,discovered That Inverter IV-1203 Which Supplies Uninterruptible Power to Distribution Panel DP-1203 Overheating,Causing Actuation of Control Room & Fuel Handling Bldgs HVAC Sys.Transformer Replaced ‎ (← links)
  • 05000498/LER-1987-009, :on 870918,determined That Atmosphere Monitor Surveillance Test Did Not Include Monitor Iodine Channel. Caused by Procedural Inadequacy.Procedure Revised & Reviewed ‎ (← links)
  • 05000498/LER-1987-008, :on 870910,reactor Trip & Auxiliary Feedwater (AFW) Actuation Signals Generated Due to Steam Generator Lo Lo Level Trip.Caused by Diagnostic Errors Causing Qualified Display Processing Sys to Reset Level Outputs ‎ (← links)
  • 05000498/LER-1987-007, :on 870906,auto-actuation of Control Room Ventilation Occurred as Result of Loss of Sample Flow Signal from Toxic Gas Monitor.Caused by Defective Flow Switch. Switch Replaced ‎ (← links)
  • 05000498/LER-1989-005, :on 890120,alarms for Turbine Generator High Vibration & Bearing 8 & 9 High Temp Received W/Fire Subsequently Reported at Bearing 9.Caused by Loss of Cooling Hydrogen Due to Loose Temp Sensor Connection ‎ (← links)
  • 05000498/LER-1987-004, :on 870903,control Room Ventilation Actuation Recirculation Mode Occurred.Caused by Personnel Error.Formal Personnel Training Will Be Provided,Protective Covers Used & Warning Labels Placed on Panel ZCP-023 ‎ (← links)
  • 05000498/LER-1987-006, :on 870905,sample Flow to Control Room Ventilation Intake Radiation Monitor Isolated,Causing Shift to Recirculation Mode.Caused by Incorrect Procedure. Technician Trained on Procedures ‎ (← links)
  • 05000498/LER-1987-005, :on 870904,incorrect Operator Response to Loss of Backup Power Resulted in auto-actuation of Control Room Ventilation Sys to Recirculation Mode.Caused by Lack of Operator Knowledge.Operator to Be Trained ‎ (← links)
  • 05000498/LER-1989-006, :on 890121,partial Loss of Offsite Power Occurred on ESF Train A.Caused by Inadvertent Actuation of Generator Breaker Test Switch by Unlicensed Plant Operator. Caution Labels Added Near Test Switches ‎ (← links)
  • 05000498/LER-1987-003, :on 870817,discovered Emergency Cooling Water Pump 1B Tripped Due to Sheared Limitorque Actuator Motor SMB-0-25 shaft-to-pinion Key.Caused by Use of Defective or Incorrect Matl.Keys Replaced ‎ (← links)
  • 05000498/LER-1987-001, :on 870824,discovered That Both Unit Vent Radiation Monitors Lost Sample Flow & Inoperable Due to Shutdown of Sample Pumps.Caused by Personnel Error at Computer Console.Addl Personnel Training Performed ‎ (← links)
  • 05000498/LER-1998-002, :on 980203,SG Narrow Range Level EOP just-in narrow-range Setpoint Was Noted Different than Setpoint for Current Sgs.Caused by Incorrectly Assuming Height in Calculation to Determine Eop.Revised EOP for SGs ‎ (← links)
  • 05000498/LER-1999-008, :on 990912,unit Tripped During Performance of Main Turbine Emergency Trip Test Procedures.Caused by Failure in Turbine Trip Test Circuitry.Main Control Boards Were Cleaned & Other Panels Were Inspected ‎ (← links)
  • 05000498/LER-1997-013-01, Forwards LER 97-013-01,re Failure to Meet TS Leak Rate Requirements for Supplementary Containment Purge Supply Isolation Valve ‎ (← links)
  • 05000498/LER-1997-006, :on 970507,inappropriate Surveillance Procedure Monitoring Parameters Were Noted.Caused by Inadequate Review of Changes Made to TS & Bases.Evaluated Review Processes for TS Changes W/Focus on Changes to Bases ‎ (← links)
  • 05000498/LER-1997-008, :on 970811,ESF Containment Spray Actuation Relays Slave Relay Test Were Not Fully Tested by Surveillance.Caused by Failure to Understand Expectations Re Documentation.Spray Pumps Verified Operable ‎ (← links)
  • 05000498/LER-1999-007, :on 990812,plant Train B CR Makeup & Cleanup Filtration Sys Was Declared Inoperable for Greater than Aot. Caused by Degradation of Makeup Filter & Filter Charcoal Due to Aging.Subject Filter Was Replaced on 990805 ‎ (← links)
  • 05000498/LER-1999-006, :on 990627,automatic Reactor Trip Occurred Due to over-temp delta-temp Actuation.Caused by Degraded flag- Lug Connection for -15 Vdc Power Supply.Licensee re-crimped Failed flag-lug Connector ‎ (← links)
  • 05000498/LER-1988-060, :on 881013,automatic Actuation of Control Room Ventilation to Recirculation Mode Occurred.Caused by High Level Readings on Hydrochloric Acid Channel of Single Toxic Gas Analyzer.Automatic Actuation Removed ‎ (← links)
  • 05000498/LER-1999-003-01, :on 990329,CR HVAC Was Placed in Recirculation Mode of Operation Instead of Recirculation Mu Filtered Mode. Caused by Inadequate Verbal Communications.Briefed Crews on Attention to Detail During three-way Communications ‎ (← links)
  • 05000498/LER-1999-002-01, :on 990327,inadequate Performance of TS Surveillance When Evaluating Source Range Nuclear Instrument Discriminator Bias Curve Results,Was Discovered.Caused by Lack of Process to Incorporate Info.Compared Bias Curves ‎ (← links)
  • 05000498/LER-1988-059, :on 881006,operator Started Train C of High Head Safety Injection Pump Instead of Train C of Low Head Safety Injection Pump.Caused by Personnel Error.Operations Personnel Briefed ‎ (← links)
  • 05000498/LER-1999-001-01, :on 990311,RHR Sys Was Found in Condition Outside Design Basis.Caused by Inadequate Implementation of Design Basis Requirements.Condition Remedied by Opening Disconnect Switches Per Rev to Plant Procedures ‎ (← links)
  • 05000498/LER-1988-056, :on 880930,determined That Two Primary Penetration Protection Circuit Breakers Not Included in Surveillance Test Program as Required by Tech Spec.Caused by Use of Licensing Basis Document ‎ (← links)
  • 05000498/LER-1988-053, :on 880920,NRC Notified That Gaseous Effluent Radiation Monitor Alarm Setpoints Not Calculated in Accordance W/Offsite Dose Calculation Manual.Caused by Inadequate Review of Manual Rev ‎ (← links)
  • 05000498/LER-1998-001-01, :on 980122,failure to Perform an Adequate TS Surveillance Re Containment Structural Integrity.Caused by Ineffective Performance.Training on New Calculation Procedure Has Been Provided ‎ (← links)
  • 05000498/LER-1997-012, :on 971110,reactor Trip Occurred Due to Overtemperature/Delta Temperature Actuation.Caused by Momentary Energization of Overspeed Protection Control Solenoid.Failed Solid State Relay in Circuitry Was Removed ‎ (← links)
  • 05000498/LER-1997-009-02, Forwards LER 97-009-02 Re MSSV Setpoints Found Outside Required Tolerances.Commitments Made in Original Licensee Event Rept Revised as Indicated in Corrective Action Section of Attachment to Ltr ‎ (← links)
  • 05000498/LER-1988-025, :on 880323,ESF Actuation of Control Room Ventilation Sys to Recirculation Mode Occurred.Caused by Actuation of Control Room Ventilation Radiation Monitor. Continued Surveillance Testing Will Be Done ‎ (← links)
  • 05000498/LER-1988-013, :on 880204,two Time Delay Relays in solid-state Protection Sys Not Tested During Surveillance.Caused by Inadequate Review of Vendor Technical Manual & Actuation Logic Schematics.Procedure Revised ‎ (← links)
  • 05000498/LER-1999-005, :on 990519,auxiliary FW Train D Was Noted Inoperable for Greater than 72 H TS Limit.Caused by Less than Adequate Work Instructions.Revised Associated Procedures ‎ (← links)
  • 05000498/LER-1998-010, :on 981021,FHB Exhaust Booster Fan 11A Was Declared Inoperable When Ground Indication Was Discovered During Sp.Caused by Fan Motor That Needed to Be Replaced. Preventive Maint Was Performed on Motors.With ‎ (← links)
  • 05000498/LER-1999-004-01, :on 990516,Unit 1 Experienced Automatic Reactor Trip.Caused by Equipment Failure.Stp Will Evaluate Potential Transformer Testing Procedure for Incorporation of Fuse Resistance Measurements by 990715.With ‎ (← links)
  • 05000498/LER-1988-057, :on 881004,during Maint Outage,Train a ESF Load Sequencer Actuated,Initiating Short Circuit Which Caused Cascading Failure & Malfunctions of Sequencer Components. Caused by Personnel Error.Module Replaced ‎ (← links)
  • 05000498/LER-1988-034, :on 880517,discovered That Preoperational Test Procedures Did Not Include Test for One ESF Sequencer Actuations of Containment Spray Pumps.Caused by Procedural Inadequacy Due to Uniqueness of Signals ‎ (← links)
  • 05000498/LER-1988-035, :on 880518,discovered Nonperformance of Required Surveillance Test for Component Cooling Water Valve.Caused by Inadequate Procedure.Surveillance Program Revised to Provide Improved Tracking Sys ‎ (← links)
  • 05000498/LER-1988-058, :on 881005,automatic Actuation of Train B Control Room Envelope Ventilation Sys to Recirculation Mode Occurred.Caused by Failed Integrated Circuit Chip in ESFs Load Sequencer.Load Sequencer Reworked ‎ (← links)
  • 05000498/LER-1988-055, :on 880930,automatic Actuation of Control Room Ventilation to Recirculation Mode Occurred.Caused by High Level Trip of Hydrochloric Acid Channel on One of Two Toxic Gas Analyzers.Analyzer Will Be Replaced ‎ (← links)
  • 05000498/LER-1988-032, :on 880512,feedwater Pump Failed Performance Test.Caused by Stress Corrosion Cracking/Hydrogen Embrittlement of Sleeve Matl.Pump Sleeve Matl Will Be Replaced W/Softer Stainless Steel ‎ (← links)
  • 05000498/LER-1988-033, :on 880418,loss of Suction Pressure to Pumps Occurred on Swap Over from Vol Control Tank to Refueling Water Storage Tank.Caused by Design Error in Piping Configuration.Procedures Modified ‎ (← links)
  • 05000498/LER-1988-021, :on 880224,ESF Actuation Due to Inverter Failure.Caused by Dc to Dc Converter Assembly Failure.Plant Engineering Dept Reviewed Results of Vendor Failure Analysis.Failures Identified as Random ‎ (← links)
  • 05000498/LER-1988-029, :on 880424,Tech Spec 3.0.3 Entered on Two Occasions for Total of 17 Minutes During Testing of Steam Generator Porvs.Caused by Shift Supervisor Determination Action Constituted Acceptable Entry ‎ (← links)
  • 05000498/LER-1988-054, :on 880921,automatic Actuation of Control Room Ventilation to Recirculation Mode Occurred.Caused by High Level Reading on Ammonia Channel.Request to Increase Tech Spec Limit for High Level Ammonia Submitted ‎ (← links)
  • 05000498/LER-1988-051, :on 880902,door Required to Separate Area Classified as Mild Environ from Area Classified as Harsh Environ Deleted During Const.Caused by Personnel Error. Design Change Issued to Install Door ‎ (← links)
  • 05000498/LER-1988-031, :on 880509,extended Range Neutron Sys Cable Assemblies Mfg by Gamma-Metrics Found Incapable of Performing Required Safety Functions.Caused by Solder Joint Leakage.Cable Assemblies & Detectors Replaced ‎ (← links)
  • 05000498/LER-1998-009, :on 980924,inlet Temps from Idle Reactor Containment Fan Coolers Did Not Accurately Reflect Containment Air Temp.Caused by CR Log Format Not Clearly Specifying Noted Readings.Revised CR Logs ‎ (← links)
  • 05000498/LER-1988-030, :on 880506,automatic Actuation of Control Room Ventilation to Recirculation Mode Occurred.Caused by High Hydrochloric Acid Trip on One of Two Toxic Gas Analyzers. Memo Issued to Plant Personnel ‎ (← links)
  • 05000498/LER-1988-028, :on 880401,leakage Observed at Number of Locations in aluminum-bronze Essential Cooling Water Sys. Caused by Crevice Corrosion in Small Bore Fittings & Valves. Leaking Components Replaced ‎ (← links)
  • 05000498/LER-1988-050, On 880827,ESF Actuation of All Three Trains of HVAC for Control Room Envelope,Fuel Handling Bldg & Containment Bldg Occurred Simultaneously.Caused by Failure of Radiation Monitors.Investigation Underway ‎ (← links)
  • 05000498/LER-1988-049, :on 880826,reactor Trip Occuured Due to Turbine Trip Subsequently on Low Stream Pressure at 1728 H.Caused by Defective Fuse Block in Stator Cooling Water Trip Circuit. Fuse Block Replaced & Operator Trained ‎ (← links)
  • 05000498/LER-1998-006, :on 980928,failure to Fully Meet TS SR 4.0.5 for Containment Isolation Check Valves Was Noted.Caused by Inadequate Change Mgt.Entered Into TS 3.6.3 & Tested Four Valves in Unit 2 ‎ (← links)
  • 05000498/LER-1998-006-01, Forwards LER 98-006-01,re Failure to Fully Meet Requirements of TS Surveillance 4.0.5 for Containment Isolation Check Valves.Commitments Made by Util Are in Corrective Actions Section of LER ‎ (← links)
  • 05000498/LER-1998-008, :on 980909,TS 3.0.3 Was Entered Due to Inoperable Rod Control Demand Step Counters.Caused by Inadequate Communication Between CR Staff & Maint Personnel.Detailed Discussions of Lessons Learned Held ‎ (← links)
  • 05000498/LER-1998-007, :on 980915,failure to Perform Quarterly Surveillance of Td Afp.Caused by Inadequate on-shift Surveillance Test Preparation.Checklist Was Developed for Surveillance Preparation,Performance & Review Requirements ‎ (← links)
  • 05000498/LER-1988-048, :on 880816,reactor Tripped as Result of Main Turbine Trip.Caused by Failure of Stator Cooling Water Pump Discharge Check Valve to Close.Stator Cooling Water Pump Discharge Check Valve Packing Replaced ‎ (← links)
  • 05000498/LER-1988-047, :on 880802,automatic Actuation of Control Room Ventilation to Recirculation Mode Occurred.Caused by Momentary High Level Reading on HC1 Channel of Single Toxic Gas Analyzer.Subcommittee Studying Problem ‎ (← links)
  • 05000498/LER-1988-017, :on 880211,operations Personnel Notified That Personnel Air Lock Sealing Air Sys Containment Isolation Valves Did Not Meet Requirements of GDC 57.Caused by Design Error.Mod Implemented to Meet Requirement ‎ (← links)
  • 05000498/LER-1988-026, :on 880330,reactor Trip & Safety Injection Sequence Initiated Due to Partial Offsite Power Loss.Caused by Personnel Error & Design Inadequacy.Event Incorporated in Training Session & Protection Sys Evaluated ‎ (← links)
  • 05000498/LER-1988-045, :on 880719,reactor Trip on Over Temp/Delta Temp Occurred.Caused by Personnel Error.Detailed Instructions on Qualified Display Processing Sys Reset to Applicable Procedures & Technicians Trained ‎ (← links)
  • 05000498/LER-1988-041, :on 880710,high Toxic Gas Alarm Occurred W/O Automatic Actuation of Control Room Ventilation to Recirculation Mode.Caused by Incorrect Configuration of Wiring.Wiring Corrected ‎ (← links)
  • 05000498/LER-1988-042, :on 880711,automatic Actuation of Control Room Ventilation to Recirculation Mode Occurred as Result of High Hydrochloric Acid Trip on One of Two Toxic Gas Analyzers. Caused by Malfunction of Analyzer ‎ (← links)
  • 05000498/LER-1988-043, :on 880712,surveillance Test for Contamination in Generator Fuel Oil Not Performed Due to Personnel Error. Surveillance Performance on Due Date & Review of Overdue Repts Requirements Added ‎ (← links)
  • 05000498/LER-1988-044, :on 880714,automatic Actuation of Control Room Ventilation Sys to Recirculation Mode Occurred.Caused by Presence of Halon Gas in zero-sample Gas Used as Ref Value for Measurement of Subsequent Samples ‎ (← links)
  • 05000498/LER-1988-040, :on 880623,surveillances Identified W/Tech Specs Re Reactor Trip Breaker Test Intervals Scheduled W/Method Which Could Result in Improper Staggering of Test Intervals.Caused by Inadequate Program ‎ (← links)
  • 05000498/LER-1988-024, :on 880316,discovered That Resetting Safeguards Test Cabinet Master Reset Would Reset & Block Safety Injection Actuation on Train A,B or C.Caused by Design Error.Design Change Issued to Modify Circuitry ‎ (← links)
  • 05000498/LER-1987-026, :on 871212,discovered That Degraded Undervoltage Coincident W/Safety Injection Not Tested.Caused by Personnel Misinterpretation of Trip Actuation Devise Operational Test Requirements ‎ (← links)
  • 05000498/LER-1988-038, :on 880613,failure to Perform Surveillance Testing of Intermediate Range Nuclear Instrumentation Prior to Entering Mode 2 Discovered.Caused by Inadequate Surveillance Program.Mode Change Rept Reviewed ‎ (← links)
  • 05000498/LER-1988-014, :on 880204,reactor Protection Sys Actuation Occurred.Caused by Software Design Error in Qualified Display Processing Sys (Qdps) Temp Averaging Sys.Qdps Modified to Prevent Recurrence ‎ (← links)
  • 05000498/LER-1988-023, :on 880311,frequency of Required Surveillance Test on Essential Cooling Water Screen Wash Booster Pump Not Doubled as Required.Caused by Inadequate Procedure.Procedure Revised to Define Surveillance Frequency Info ‎ (← links)
  • 05000498/LER-1988-008, :on 880120,safety-related Electrical Cable Splices Incorrectly Installed.Caused by Personnel Not Following Correct Cable Splice Detail Sheet.Procedures Revised W/Detailed Instructions ‎ (← links)
  • 05000498/LER-1988-037, :on 880609,480-volt Breaker Failed to Automatically Close Due to Mfg Defect.Insp Performed on 23 480-volt Class 1E Load Ctr Breakers Which Automatically Close After ESF Load Sequencer.Part 21 Related ‎ (← links)
  • 05000498/LER-1988-036, :on 880607,unmonitored Release of 1,504 Gallons of Liquid Effluent Occurred.Caused by Personnel Error. Responsible Individual Counseled & Incident Reviewed W/ Others Involved W/Radioactive Effluents ‎ (← links)
  • 05000498/LER-1988-018, :on 880212,safety Injection Actuation Initiated by Excessive Cooldown Protection Logic Following RCS Flow Coastdown Measurement Test.Caused by Formation of Slug of Cool Water in Coolant Loop.Test to Be Revised ‎ (← links)
  • 05000498/LER-1988-009, :on 880123,unanticipated Safety Injection Signal Occurred from Solid State Protection Sys Actuation Train A.Caused by Inadequate Surveillance Procedure.Train a & B Master Relay Test Procedures Revised ‎ (← links)
  • 05000498/LER-1988-007, :on 880115,surveillance Procedure Review Identified Incorrectly Applied Air Density Correction Factors Used in Airflow Calculations.Caused by Weakness in Review of HVAC Filter Test Procedures ‎ (← links)
  • 05000498/LER-1997-007, :on 970619,ESFAS Pressurizer Pressure Sys Interlock Was Not Fully Tested by Surveillance Procedures. Caused by Failure to Recognize That Circuitry Did Not Include Required Provisions.Revised Sps ‎ (← links)
  • 05000498/LER-1988-003, :on 880106,automatic Actuation of Control Room Ventilation Sys to Recirculation Mode Occurred.Caused by Improper Operator Action When Transferring Distribution Panel Back to Preferred Power Supply ‎ (← links)
  • 05000498/LER-1988-005, :on 880110,inadequate Surveillance Performed on Control Room Intake Air Radioactivity Monitor.Caused by Procedure & Operator Errors.Procedures Will Be Revised & Addl Guidance Will Be Given to Operators ‎ (← links)
  • 05000498/LER-1988-006, :on 880112,inadequate Surveillance of Master Relays Determined.Caused by Inadequate Technical Development of Surveillance Procedure.Surveillance Procedures Corrected ‎ (← links)
  • 05000498/LER-1987-025, :on 871209,ESF Train a Loss of Offsite Power Actuation Occurred.Caused by Procedural Errors Coupled W/Hardware Failure.Relay Test Procedure Revised ‎ (← links)
  • 05000498/LER-1988-002, :on 880105,discovered Failure to Perform Local Leakage Rate Testing on Containment Isolation Valves.Caused by Lack of Training Re Required post-maintenance Testing. Valves Retested & Personnel Counseled ‎ (← links)
  • 05000498/LER-1987-022, :on 871206,control Room Toxic Gas Monitors Inoperable.Caused by Inadequate Training Program for Toxic Gas Monitoring Sys Operation & Channel Checks.Monitor Operation Training & Logging Procedure Planned ‎ (← links)
  • 05000498/LER-1987-023, :on 871010 & 12,loose or Displaced valve-shaft- to-actuator Drive Keys Identified in motor-operated Valves. Condition Evaluated on 871208.Caused by Lack of Vendor Guidance.Manuals Amended.Part 21 Related ‎ (← links)
  • 05000498/LER-1987-024, :on 871208,control Room Ventilation Actuation to Recirculation Mode Occurred.Caused by Personnel Error. Flow Pushbuttons Disabled & Technicians Briefed on Importance of Attention to Detail ‎ (← links)
  • 05000498/LER-1988-015, :on 880206,two MSIVs Declared Inoperable When Duty Shift Supervisor Learned That Packing Adjustments Performed.Addl Requirements for Containment Isolation Valves Not Carried Out Until 880207 ‎ (← links)
  • 05000498/LER-1988-020, :on 880215,review of Inservice Test on Essential Cooling Water Screen Wash Booster Pump 1A Revealed That Pump Test Data Outside Acceptable Range.Caused by Personnel Error.Special Training Initiated ‎ (← links)
  • 05000498/LER-1988-019, :on 880212 & 13 Unit Cooldown to Satisfy Tech Spec 3.0.3 Prematurely Terminated.Caused by Personnel Error. Addl Guidance for Determining Equipment Operability & Special Training Held ‎ (← links)
  • 05000498/LER-1988-012, :on 880129,limiting Value for Stroke Time on Valve CV-FCV-0205 Found Omitted from Inservice Test Plan. Caused by Inadequate Administrative Control.Temporary Procedure ITSP03-CV-0001 Corrected Deficiency ‎ (← links)
  • 05000498/LER-1988-011, :on 880127,nonperformance of Scheduled Surveillance Test on Essential Chilled Water Pump 11B Discovered.Caused by Inadequate Control of Test Packages. Procedure Rev Underway ‎ (← links)
  • 05000498/LER-1987-021, :on 871130,unanticipated Bus Trip & Diesel Generator Start Occurred.Cause Could Not Be Conclusively Determined.Technicians Received Training on Deenergizing ESF Sequencer by Opening Main Circuit Breaker ‎ (← links)
  • 05000498/LER-1988-010, :on 870923,maint Work Request Prepared Stating That Charging Header Pressure Indicator Reading 1,000 Psi More than Local Process Pressure Gauge.Caused by Lack of Identification in Tech Spec Re Subj Loop ‎ (← links)
  • 05000498/LER-2020-001, Automatic Actuation of Emergency Diesel Generators Due to Lockout of Switchyard Electrical Bus ‎ (← links)
  • 05000498/LER-1997-003, :on 970123,potential for Overpressurization of Piping Identified.Caused by Deficiency in Original Design. Thermal Insulation Installed on Lines 3WL-1009 & 3WL-2009 & Lines Have Been Returned to Service ‎ (← links)
  • 05000498/LER-1996-004, :on 961120,unanalyzed Conditions Were Noted Due to Discovery of Two Spare SR Circuit Breakers Not in Seismically Qualified Position.Caused by Failure to Follow Established Procedures.Revised Procedures ‎ (← links)
  • 05000498/LER-1997-005-01, :on 970402,main Steam Safety Valve Setpoints Were Discovered Outside Required Tolerance Due to Alteration of Nozzle Seat & Disc Seat Oxide Layers.Lift Settings Were Adjusted to Required Allowable Tolerances ‎ (← links)
  • 05000498/LER-1994-019-01, Forwards LER 94-019-01,removing Commitment to Revise SI Actuation & Response Time Test Surveillance Procedure to Include spin-up Time for Fuel Handling Bldg HVAC Sys ‎ (← links)
  • 05000498/LER-1997-004, :on 970319,failed to Fully Test 4160 Volt Bus Undervoltage Logic Circuitry by Surveillance Procedures. Caused by Not Recognizing That Failure in One Actuation Scheme.Affected Logic Circuitry Was Tested ‎ (← links)
  • 05000498/LER-1997-002, :on 970115,safety Injection Sys Logic Circuitry Not Fully Tested by Surveillance Procedures.Caused by Unusual Logic Arrangement.Containment Sump Isolation Valves Have Been Tested ‎ (← links)
  • 05000498/LER-1995-013, :on 951218,turbine Trip & Reactor Trip Occurred,Due to Main Transformer Lockout.Caused by Improper Maint Performance.Grounded Connection Repaired,Mgt Expectations Reinforced & Procedures Revised ‎ (← links)
  • 05000498/LER-1996-005, :on 961213,reactor Containment Building Personnel Airlock Incorrectly Declared Operable Occurred. Caused by Pertinent Information Re Status of Seal Replacement.Occurrence Has Been Reviewed ‎ (← links)
  • 05000498/LER-1993-003, :on 930112,TS 3.0.3 Entered Due to Inoperable Steam Line Pressure Channels.Caused by Lack of Understanding by Procedure Writers Re Calibr Time Constants.Affected Time Constants Calibr ‎ (← links)
  • 05000498/LER-1993-004, :on 930112,TS Violated When ASME Section XI Code Surveillance Test Exceeded Grace Period for Outside Containment Isolation Suppl Purge Valve.Desk Top Instruction for Surveillance Coordinator Changed ‎ (← links)
  • 05000498/LER-1993-002, :on 930109,TS 3.0.3 Condition Declared When Two Channels of power-range Instrumentation Inoperable.Caused by Inadequate Procedural Guidance in Calibr Procedure.Channel Calorimetrics Procedure Revised ‎ (← links)
  • 05000498/LER-1992-003, :on 920314,reactor Tripped Due to Failure to Follow Procedures During RCS Flow Transmitter Restoration. Dept Training Sessions Conducted for Appropriate Maint Personnel ‎ (← links)
  • 05000498/LER-1993-001, :on 930105,discovered That RCS Loop 3 Outside TS 2.2.1 Range & Loop Declared Inoperable.Caused by Two RCS delta-T Channels Being Inoperable Simultaneously.Loop Restored & Startup Testing Procedure Revised ‎ (← links)
  • 05000498/LER-1992-021, :on 921215,identified That Main Steam Line Isolation Actuation & Response Time Test Did Not Satisfy Requirements.Caused by Personnel Error.Procedures Revised ‎ (← links)
  • 05000498/LER-1992-010, :on 920808,standby Train a CCW Pump Started Due Sensed Low Pressure on Miscellaneous Supply Header.Caused by Lack of Procedural Guidance.Surveillance Procedure & Sys Operating Procedure Revised ‎ (← links)
  • 05000498/LER-1992-009, :on 920801,operator Performing AFW Portion of Solid State Protection Sys Test Misread Procedure & Turned Control Switch On,Causing Pump to Discharge Into SG C.Caused by Personnel Error.Procedure Revised ‎ (← links)
  • 05000498/LER-1992-020, :on 921209,discovered That Toxic Gas Monitor XE-9326 Channel Was Not in Tripped Condition Required by TS 3.3.3.7.Caused by Less That Adequate Design of Toxic Gas Monitoring Sys.Caution Tag Initiated ‎ (← links)
  • 05000498/LER-1992-019, :on 921202,discovered Calculation Errors in Setpoint Curves for PORVs in Cold Overpressure Mitigation Sys.Caused by Failure of Westinghouse Analysis to Allow for Differential Pressure.High Setpoint Reset ‎ (← links)
  • 05000498/LER-1992-017, :on 921111,identified That Feedwater Isolation Response Time Not Being Tested Correctly as Required by Ts. Caused by Procedure Inadequacies.Fw Isolation Actuation & Response Time Testing Procedures Revised ‎ (← links)
  • 05000498/LER-1992-012, :on 920903,both Channels of Drpi Declared Inoperable & Unusual Event Declared.Caused by Failure of One of Drpi Control Module Power Supplies.One of Two Drpi Power Supplies Replaced & Made Operable ‎ (← links)
  • 05000498/LER-1992-011, :on 920824,identified That RCP Undervoltage & Underfrequency Trip Not Tested Completely Per Ts.Cause Due to Writers Not Identifying Need to Verify Bsm Lights. Procedure for Field Changes Will Be Revised ‎ (← links)
  • 05000498/LER-1992-015, :on 921003,discovered That Unplanned ESF Actuation of Component Cooling Water Pump Due to Operator Inattention.Involved Operations Personnel Have Been Counseled by Management ‎ (← links)
  • 05000498/LER-1992-016, :on 921004,unplanned ESF Actuation of Component Cooling Water Pump Occurred Due to Inadequate Procedure. CCW Surge Tank Level Recovered & CCW Sys Realigned in Accordance W/Procedure ‎ (← links)
  • 05000498/LER-1992-014, :on 920928,containment Ventilation Isolation Occurred Prior to Expected Actuation During Surveillance Test.Caused by Less than Adequate Procedure.Procedures Revised & Setpoint Changed for Unit 1 ‎ (← links)
  • 05000498/LER-1996-009, :on 960620,containment Closeout Insp Failed to Recognize Unauthorized Material Left in Containment.Caused by Inadequate Requirement Review.Removed Bagged Equipment & Completed Containment Closeout Insp ‎ (← links)
  • 05000498/LER-1992-013, :on 920915,discovered That Portion of Containment Spray Channels Between Process Instrumentation & ESF Actuation Instrumentation Not Completely Verified.Caused by Inadequate Review.Procedures Revised ‎ (← links)
  • 05000498/LER-1992-008, :on 920731,CVI Actuation Occurred But Radiation Monitors Did Not Indicate Any High Radiation Conditions. Caused by Momentary Variance in Current to Remote Control Unit.Module Cabinets Will Be Repaired ‎ (← links)
  • 05000498/LER-1996-002-01, :on 960507,failure to Meet Requirements of Tech Specs Occurred.Caused by Inattention to Detail During Documentation & Review of Testing Results.Feedback from Event Given to Individuals Involved ‎ (← links)
  • 05000498/LER-1996-001-01, :on 960328,Standby Diesel Generator Declared Inoperable.Caused by Barriers for Preparation & Planning Not Being Fully Implemented.Personnel Involved Counseled Re Event & Revised Preventive Maint Documents ‎ (← links)
  • 05000498/LER-1992-006-01, :on 920318,discovered That All Four Auxiliary Feedwater Flow Control Valves in Closed Position Following Reactor Trip on 920314.Caused by Inattention to Detail. Valves Opened & Reactor Trip Procedure Revised ‎ (← links)
  • 05000498/LER-1992-004-01, :on 920519,shunt Contacts for Manual Reactor Trip Breakers Not Tested for Ts.Caused by Unfamiliarity of Individual Responsible for Developing Procedure W/Manual Reactor Trip Feature.Plant Procedure Revised ‎ (← links)
  • 05000498/LER-1995-009, :on 950829,reactor Tripped Due to Loss of Reactor Coolant Flow.Caused by Inadequate Supervisory Practices.Discussion Conducted W/Supervisors on Importance of Proper Supervisory Involvement ‎ (← links)
  • 05000498/LER-1995-012, :on 950926,RHR Pump Impeller Cracks Occurred. Caused by Improper Mfg of Impeller.Rhr Pump Impeller Replaced ‎ (← links)
  • 05000498/LER-1995-011, :on 951121,determined That Train B CR Makeup & Cleanup Filtration Sys Carbon Filters Had Not Met TS SRs for Period of 14 Days Between 951101-11 Due to Inadequate Design of Deluge Sys.Filters Replaced ‎ (← links)
  • 05000498/LER-1992-003-01, :on 920314,reactor Trip Occurred from Momentary False Reactor Coolant Low Flow Trip Signal.Caused by Failure to Follow Procedures.Shift & Unit Supervisors Briefed. Reactor Trip Prevention Policy Established ‎ (← links)
  • 05000498/LER-1991-014-02, Forwards LER 91-014-02 Re Erratic Containment Extended Range Pressure Channel Output.Suppl Provides Results of Util Evaluation of Failure Rate of safety-related Barton Model 752 Transmitters in pressure-related Applications ‎ (← links)
  • 05000498/LER-1995-010, :on 950926,failed to Meet Requirements of TS Surveillance Times for Logging Afd Due to Inadequate Review of TS Monitoring & Logging Requirements of Indicated Afd. Revised Operator Log for Monitoring Afd ‎ (← links)
  • 05000498/LER-1992-002-01, :on 920124,discovered That Containment Integrity Requirements Violated Since 911018 Due to Leaking Handhole Cover on Secondary Side of SG 1C.Caused by Misinterpretation of Ts.Guidance Added to TS ‎ (← links)
  • 05000498/LER-1995-008, :on 950728,RCS Flow Instrument Was Inoperable Due to FT0447 Exceeded Total Allowance Limit.Recalibrated Affected RCS Flow Transmitter ‎ (← links)
  • 05000498/LER-1991-020, :on 910914,rod Position Deviation Monitor Incorrectly Declared Inoperable.Caused by Failure to Perform Two Rod Position Surveillances.Formal Training Classes Will Be Held for Licensed Operators ‎ (← links)
  • 05000498/LER-1992-001-01, :on 920122,entry Into Specification 3.0.3 Due to 2 Trains of Essential Chillers Being Inoperable.Plant Operations Personnel Have Been Informed by Night Orders of Impact of Transferring Oil ‎ (← links)
  • 05000498/LER-1995-007, :on 950719,seismic Monitor Was Inoperable for More than 30 Days & Subsequently Failed to Submit Special Rept in Accordance W/Ts.Caused by Excessive Vibration at Accelerograph.Replaced Accelerograph & Returned to Svc ‎ (← links)
  • 05000498/LER-1995-004, :on 950328,failed to Meet Requirements of TS Due to Not Testing Contact of Load Sequencer Relay.Assembled Surveillance Credit Package for All Trains of Engineered Safety Features Diesel loss-of-offsite-power Surveillances ‎ (← links)
  • 05000498/LER-1991-023, :on 911011,discovered Motor Lead Insulation Cracking on RHR Pumps in Trains a & C.Caused by Differences in Flexibility of Motor Lead Between Original Insulation & Insulation W/Raychem Sleeve.Cracks Repaired ‎ (← links)
  • 05000498/LER-1991-024, :on 911031,discovered That Updated Fsar,Chapter 15 Safety Analysis Did Not Consider Pressurizer Safety Relief Valve Loop Seal Delay Time.Caused by NSSS Vendor Error.Jco Issued on 911105 ‎ (← links)
  • 05000498/LER-1991-021, :on 911010,power from 1J Bus Lost When Electrician Misapplied Multimeter Test Leads in Energized Circuit,Resulting in Reactor Trip.Caused by Personnel Error. Pump Reenergized & Training Session Held ‎ (← links)
  • 05000498/LER-1991-002, :on 910126,automatic Actuation of Safety Injection Sys Occurred in One of Three Trains.Caused by Inadequate Work Instructions for Maint Activity.Training Bulletin Issued Describing Event ‎ (← links)
  • 05000498/LER-1991-022, :on 911014,licensed Operator Failed to Block Turbine Trip Signal,Resulting in Turbine & Reactor Trip. Caused by Personnel error.Site-wide Training Sessions Held for Appropriate Plant Personnel ‎ (← links)
  • 05000498/LER-1991-019, :on 910905,reactor Coolant Sys Leak Rate Exceeded Tech Spec Limits.Event Resulted from Damaged Valve Packing.Valve Repacked & Returned to Operable Status.W/ ‎ (← links)
  • 05000498/LER-1995-006, :on 950420,failed to Meet Requirements of TS Due to Not Performing Required Surveillance on H Recombiner. Held Briefings to Stress Need for Proper Identification of Components During Performance of Activities ‎ (← links)
  • 05000498/LER-1995-005, :on 950408,failed to Meet Requirements of TS Due to Inoperability of Standby DG as Result of Failed Lug. Replaced Broken Slip Ring Connector & Addl Slip Ring Connector ‎ (← links)
  • 05000498/LER-1995-003, :on 950227,MSSV & Pressurizer Safety Valve Setpoint Found Outside Required Tolerances.Caused by Setpoint Drift.Adjusted Lift Settings of Seven MSSV to Be within Required Allowable Tolerances ‎ (← links)
  • 05000498/LER-1995-001, :on 950124,experienced Reactor Trip Due to low- Low SG Level on 1C SG After Loss of MFW Pump 13.Caused by Failed Thrust Bearing Wear Probe Assembly.Thrust Bearing Wear Probe Assembly on MFW Pump 13 Replaced ‎ (← links)
  • 05000498/LER-1995-002, :on 950124,excessive Degradation of Boraflex Neutron Poison Found in Plant Spent Fuel Pool Storage Racks. Restrictions Placed on Use of Degraded Unit 1,region 1 Storage Cells ‎ (← links)
  • 05000498/LER-1994-017, :on 941011,gaseous Effluent Monitor Setpoints Had Not Been Calculated in Accordance W/Offsite Dose Calculation Methodology.Caused by Failure to Revise Related Change Documents.Monitors Verified Operable ‎ (← links)
  • 05000498/LER-1994-020, :on 941209,determination Made That Combined Total of 66 Breakers Potentially Out of Tolerance.Caused by Misinterpretation of Acceptance Criteria.Molded Case Circuit Breaker Tests Procedure Revised ‎ (← links)
  • 05000498/LER-1994-018, :on 941102,required 0.125 Inches Water Gauge Could Not Be Demonstrated on Trains of CR Envelope HVAC Due to Less than Adequate Surveillance Test Procedure.Electrical Auxiliary Bldg HVAC Airflows Adjusted ‎ (← links)
  • 05000498/LER-1991-017, :on 910526,control Room Ventilation Sys Actuated to Recirculation Mode as Result of Spurious Trip from Toxic Gas Analyzer.Possibly Caused by Poor Electrical Connection.Analyzer Reworked ‎ (← links)
  • 05000498/LER-1991-016, :on 910513,failure to Perform Surveillance Test Occurred.Caused by Personnel Error.Special Orders Issued, Procedures & Lab Schedules Changed to Improve Visibility & Increase Awareness of Surveillance ‎ (← links)
  • 05000498/LER-1994-015, :on 940920,unit 1 Experienced Reactor Trip on low-low Steam Generator Level for Approx Four Minutes After Loss of Steam Generator Feedwater Pump.Caused by Expected Response Instead of Actual Conditions ‎ (← links)
  • 05000498/LER-1991-009, :on 910311,diesel Generator 12 & 13 Valid Failure Occurred.Caused by Cracked Fuel Injector Nozzles Tips.Fuel Injector Nozzle Tips Replaced & Lube Oil Analysis Completed ‎ (← links)
  • 05000498/LER-1991-018, :on 910702,tech Spec Violation Occurred Due to Inoperability of Radioactive Gaseous Effluent Alarm.Caused by Misunderstanding of Internal Functions of Monitor. Database Configurations Reviewed & Changed ‎ (← links)
  • 05000498/LER-1994-018-01, :on 941102,failure to Fully Meet Requirements of TS Re CR Envelope HVAC Sys Boundary.Caused by Less than Adequate Surveillance Test Procedure.Development of Detailed Testing Method Initiated ‎ (← links)
  • 05000498/LER-1994-016, :on 940923,failure to Fully Meet Requirements of TS Due to Not Placing CR Envelope HVAC Sys in Required Mode.Toxic Gas Analyzers Repaired & Mod Implemented ‎ (← links)
  • 05000498/LER-1991-011, :on 910408,Tech Spec Required Shutdown Due to Failure of Feedwater Isolation Valve Solenoid.Caused by Failure of One of Two Redundant FWIV Solenoid Valves to Operate Due to Hydraulic Fluid.Mod Implemented ‎ (← links)
  • 05000498/LER-1991-013, :on 910412,train B ESF Actuation Occurred. Caused by Inadequate Troubleshooting Instructions. Instructions Rewritten,Reviewed,Approved & Performed Successfully ‎ (← links)
  • 05000498/LER-1994-013, :on 940804,identified Two Cases of NUMARC 87-00 Criterion Not Being Satisfied.Caused by Failure to Confirm Validity of Blackout Program.Severe Weather Guidelines Revised ‎ (← links)
  • 05000498/LER-1994-010, :on 940719,Unit 1 Failed to Fully Meet Surveillance Requirements of TS 4.7.4, Essential Cooling Water Sys. Caused by Misuse of Equipment Procedures. Revised Procedure Was re-performed for Unit 1 ‎ (← links)
  • 05000498/LER-1991-006, :on 910224,class 1E 120 Volt AC Distribution Panel Energized by Alternate Power Source Violating Tech Spec.Caused by Personnel Error.Reactor Operator Counseled Re Event ‎ (← links)
  • 05000498/LER-1991-005, :on 910218,opening of Fuel Handling Bldg Truck Doors During Fuel Movement Causes Tech Spec Violation.Caused by Incomplete Adminstrative Controls on Fuel Handling Bldg Door.Locks Placed on Truck Doors ‎ (← links)
  • 05000498/LER-1991-001-01, :on 910122,containment Ventilation Isolation Actuation Occurred While Plant in Third Refueling Outage. Caused by Spurious Actuation of Radiation Monitoring Sys. Training Bulletin Issued Re Event ‎ (← links)
  • 05000498/LER-1991-003, :on 910127,high Alarm on Radiation Monitor RT-8034 Resulted in ESF Actuation of Control Room Ventilation Sys.Cause Unknown.Sample Pump for Radiation Monitor Relaced ‎ (← links)
  • 05000498/LER-1994-002-01, :on 940115,centifugal Charging Pump 1A Discharge Bypass Valve Found in Open Position Contrary to TS 3.1.2.3 Requirements.Caused by hydro-pneumatic Transient. MOV Database Searched ‎ (← links)
  • 05000498/LER-1994-001, :on 940105,discovered Small Gaps in Reactor Containment Bldg Emergency Sumps Screens.Caused by Less than Adequate Attention to Detail.Repair Dispositions Initiated to Correct Noted Deficiencies in Sump ‎ (← links)
  • 05000498/LER-1990-026, :on 901219,Train B Loss of Offsite Power Actuation Occurred While Attempting to Transfer Power to Standby Bus 1G.Caused by Hardened Grease on Feeder Breaker & Friction Between Linkage.Maint Scheduled ‎ (← links)
  • 05000498/LER-1994-003, :on 940118,discovered Interference Between Plant Exhaust Vent Tornado Damper Linkage & Gusset.Caused by Undetected Const Interference.Interference Between Damper & Gusset Removed by Notching Gusset ‎ (← links)
  • 05000498/LER-1990-021, :on 900909 Unplanned ESF Actuations of Control Room,Reactor Containment Bldg & Fuel Handling Bldg HVAC Sys Occurred Due to Loss of Power of Radiation Monitors ‎ (← links)
  • 05000498/LER-1993-023-01, :on 931231,non-emergency ESF Actuation of Sdg 12 Occurred.Caused by Electrical Arcing Between Sdg Panel & Test Equipment.Test Equipment & Diesel Circuitry Checked for Malfunction & Degradation ‎ (← links)
  • 05000498/LER-1994-004, :on 940119,determined Surveillance Performed to Comply W/Sr 4.4.4.1.b for Rvs Needed to Be Enhanced Because PORVs Not Tested from Mcb.Procedure 1(2)PSP03-RC-0010 Replaced w/OPSP03-RC-0010 ‎ (← links)
  • 05000498/LER-1993-023, :on 931231,inadvertent ESF Actuation of Sdg 12 Occurred During Testing.Sdg Will Be Placed in Pull-to-Stop Whenever Maint Activities Performed Involving Connecting Measuring or Test Equipment to Sdg Electrical Circuits ‎ (← links)
  • 05000498/LER-1994-007, :on 940224,Reactor Trip Bypass Breaker Did Not Properly Satisfy Ts.Caused by Inadequate Procedure Preparation & Review.Surveillance Procedure Enhancement Program & Basis Document Developed ‎ (← links)
  • 05000498/LER-1994-006, :on 940214,reactor Manually Tripped Following Unanticipated Test Results.Caused by Failed post-mod Testing.Test Terminated & Solid State Rod Control Sys Returned to Original Design Configuration ‎ (← links)
  • 05000498/LER-1990-020, :on 900716,reactor Trip Occurred During Performance of Solid State Protection Sys Surveillance Test. Caused by Malfunction in Test Switch.Test Switch to Be Replaced Prior to Startup ‎ (← links)
  • 05000498/LER-1994-002, :on 940115,identified Centrifugal Charging Pump 1A Discharge Bypass Valve CV-MOV-8348 Opened.Caused by Hydropneumatic Transient.Mov Data Base Searched to Identify Other Valves Susceptible to Event ‎ (← links)
  • 05000498/LER-1993-022, :on 930418,deviation from Method for Contamination Sampling of Fuel Oil Sys Discovered.Caused by Use of Wrong Std to Develop Diesel Fuel Oil Sampling Procedure.Ts Change Will Be Submitted ‎ (← links)
  • 05000498/LER-1990-024, :on 901018,failed to Take Tech Spec Actions When One Channel of Subcooling Margin Became Inoperable ‎ (← links)
  • 05000498/LER-1990-006-01, :on 900730,manual Reactor Trip Occurred Due to Full Closure of Feedwater Isolation Valve During Partial Stroke Testing.Cause Not Conclusively Established.Training Bulletins Issued ‎ (← links)
  • 05000498/LER-1993-021, :on 930929,determined That Penetration Backup Fuse 15A Not Wired in Circuit as Required Due to Improper Rewiring of Circuits.Svc Request Disposition to Rework Wiring Per Applicable Design Documents ‎ (← links)
  • 05000498/LER-1990-015, :on 900628,reactor Trip Occurred Due to Turbine Trip Caused by Low Electrohydraulic Control Sys Fluid Pressure.Caused by Excessive Vibration by Oscillation in Main Turbine Generator Governor Valve ‎ (← links)
  • 05000498/LER-1990-019, :on 900708,discovered That Daily 24-h Power Range Nuclear Instrumentation Channel Calibr Surveillance Not Performed.Caused by Inadequate Mgt Controls.Control Room Logs Revised ‎ (← links)
  • 05000498/LER-1990-018, :on 900707,main Feedwater Isolation Valve Declared Inoperable Which Resulted in Tech Spec 3.0.3 Being Entered.Caused by Failure of Hydraulic Fluid Dump Valves to Open.Dump Valves Replaced & Tested ‎ (← links)
  • 05000498/LER-1990-017, :on 900706,determined That Personnel Failed to Adequately Perform Tech Spec Required Surveillance on Reactor Coolant Pressure Isolation Valves.Caused by Misinterpretation.Addl Training Provided ‎ (← links)
  • 05000498/LER-1990-016, :on 900616,reactor Trip Initiated When 2 of 4 Coincidence Satisfied on Over Temp/Delta Temp.Caused by Less than Adequate Attention to Decreasing Margin to Over Temp/ Delta Temp Trip Setpoint.Procedures Revised ‎ (← links)
  • 05000498/LER-1990-023, :on 900929,manual RT Due to Full Closure of FW Isolation Valve During Partial Stroke Test ‎ (← links)
  • 05000498/LER-1993-005-01, :on 930120,discovered Sdg 13 Failure to Start During Monthly Surveillance Due to Lack of Application of Proper Work Process Controls.Cleaned & Lubricated Affected Fuel Metering Rods ‎ (← links)
  • 05000498/LER-1993-018, :on 930707,discovered Remote Position Indication Verification Test for SI Sys Accumulator Vent & Header Valves Had Not Been Performed in 2 Yrs Due to Change to IST Plan ‎ (← links)
  • 05000498/LER-1993-019, :on 930709,determined That TS Requirement of MSIV Was Not Met Due to Inadequate Design of Field Change to Testing Function of Solid State Protection Sys.Corrected Missing Jumpers & Overlap Testing Discrepancy ‎ (← links)
  • 05000498/LER-1993-017, :on 930527,concluded That,Based on 930521 Determination,That Feedwater Isolation Bypass Valves Inoperable Since Pneumatic Positioners & Solenoids Remained in Svc Beyond Qualified Life.Control Scheme Modified ‎ (← links)
  • 05000498/LER-1993-017-01, Forwards LER 93-017-01 Re Extension of Feedwater Isolation Bypass Positioner & Solenoid Beyond Equipment Qualification Life ‎ (← links)
  • 05000498/LER-1993-016, :on 930503,TS Violations Occurred Due to Circuitry for SG Power Operated Relief Valves & Post Accident Monitoring Instruments Being Inoperable.Replaced Missing Screws from Unit 1 Qdps ‎ (← links)
  • 05000498/LER-1993-012, :on 930405,TS Violation Occurred Due to Incorrect Settings of Several Molded Case Circuit Breakers. Reset Affected Unit 1 Breakers to Correct Settings ‎ (← links)
  • 05000498/LER-1993-015, :on 930423,plant Personnel Determined That May 1990 Control Room Makeup & Cleanup Filtration Sys Svc Time Exceeded.Caused by Failure to Develop Run H Tracking Method. Run Times for Cleanup & Makeup Fans Monitored ‎ (← links)
  • 05000498/LER-1993-009, :on 930217,TS 3.0.3 Entered Due to Potentially Undersized Fuses in Ssps.Caused by Random Age Related Failure of Ssps Fuse.Fuses in Selected Equipment Replaced During Fuse & Breaker Field Verification Effort ‎ (← links)
  • 05000498/LER-1990-011, :on 900612,chemical Technician Supervisor Discovered That No Sample Collected in Condenser Air Removal Sys Radiation Monitor Moisture Collection Tank. Caused by Inadequate Procedure ‎ (← links)
  • 05000498/LER-1990-009-01, :on 900514,discovered That Printer for Toxic Gas Analyzer XE-9325 Was Not Updating & Surveillances for Toxic Gas Monitor XE-9325 Incorrectly Performed on 900511. Caused by Inadequate Training ‎ (← links)
  • 05000498/LER-1990-010, :on 900515,determined That Leak & Contamination Test Interval for Some Radioactive Sources Exceeded Tech Specs.Caused by Insufficient Detail in Procedures.Test Program Revised ‎ (← links)
  • 05000498/LER-1990-008, :on 891007,Tech Spec Violation Occurred Due to Failure to Perform post-maint Testing.Caused by Incorrect Determination That No post-maint Testing Required.Personnel Counseled ‎ (← links)
  • 05000498/LER-1990-007-01, :on 900430,discovered That All Three Trains of ESFAS Placed in Test & Incapable of Actuating for Approx 35 Minutes.Caused by Inadequate Prerequisite Conditions in Maint Procedure.Procedure Being Modified ‎ (← links)
  • 05000498/LER-1990-005, :on 900329,feedwater Booster Pump 11 Tripped Upon Actuation of Ground Fault Relay & Standby Pump 13 Started But Did Not Deliver Sufficient Flow to Prevent Trip. Cause Not Found.Inlet Filters to Be Cleaned ‎ (← links)
  • 05000498/LER-1990-003, Responds to 900316 Notice of Violation for Insp Repts 50-498/90-08 & 50-499/90-08.Violation Addressed in LER 90-003 Re Failure to Perform Tech Spec Required Surveillance Due to Deficient Procedure ‎ (← links)
  • 05000498/LER-1989-015, :on 890704,reactor Trip Occurred.Caused by Failure of Relay in Generator Breaker Trip Circuit.Relays in Generator Breaker Trip Circuits Replaced W/Correct Models & Checked to Ensure Proper Rating ‎ (← links)
  • 05000498/LER-1993-015-01, :on 930423,Tech Spec Violation Occurred Due to non-conservative Determination of Equipment Svc Time.Caused by Failure to Develop Run Hour Tracking Method.Run Times for Cleanup & Makeup Fans Monitored Individually ‎ (← links)
  • 05000498/LER-1993-014, :on 900511,12,14,22 & 23,CR Envelope HVAC Sys Not Operated in Correct Mode.Caused by Increased Administrative Burden & Inadequate Tracking of Lcos. Temporary Labels Placed on Main Control Board ‎ (← links)
  • 05000498/LER-1993-013, :on 930408,TS 3.1.2.1 & 3.1.2.3 Violated. Caused by Use of Less than Effective Sys for Tracking Inoperable TS Equipment & Actions During Outage.Temporary Labels Placed on Control Board ‎ (← links)
  • 05000498/LER-1993-011, :on 930317,discovered That Monthly Surveillance for Fuel Handling Bldg HVAC Exhaust Sys Did Not Verify That Outside Air Supply Relief Dampers Opened.Caused by Inadequate Procedures.Procedures Revised ‎ (← links)
  • 05000498/LER-1993-010, :on 930224,halon Actuation Occurred in Plant Computer Room,Associated Distribution Room & Battery Room. Caused by Electrical Load Test on Fps.Licensee Will Revise Fire Harzards Evaluations Procedure ‎ (← links)
  • 05000498/LER-1993-007, :on 930204,TS Required Shutdown Commenced Due to Inoperability of turbine-driven AFW Pump.On 930203,Unit 2 Experienced Reactor Trip.Caused by Water Instrusion Into Pump.Extensive Testing & Analysis Performed ‎ (← links)
  • 05000498/LER-1993-008, :on 930206,observed That Requirement of TS 3.3.2 for Containment Pressure High-1 Had Not Been Recorded in Log as Required.Caused by Undetected Error in Control Room Logs.Operator Log Corrected ‎ (← links)
  • 05000498/LER-1993-006, Forwards LER 93-006-00 Re TS Violation Due to RCS Delta Temp/Average Temp Loop Found out-of Tolerance ‎ (← links)
  • 05000498/LER-1990-004, :on 900324,standby Diesel Generator Inadvertently Started When Maint Technician Connected Test Instrument Across ESFAS Slave Relay Contact.Caused by Performing Surveillance Out of Sequence ‎ (← links)
  • 05000498/LER-1990-003-01, :on 900301,discovered That Some Valves in Component Cooling Water Sys Not Subj to Tech Spec Required Position Verification Once Per 31 Days.Caused by Personnel Error.Surveillance Procedure Revised ‎ (← links)
  • 05000498/LER-1994-011, :on 940310,safety Injection Actuation Was Received on Trains A,B & C.Cause Was Failure to Adhere to Procedure.Corrective Actions:Restored Cooling Shutdown & Removed Personnel from Watchbill ‎ (← links)
  • 05000498/LER-1991-004, :on 910215,loss of Offsite Power Actuation Occurred During Routine Maint.Caused by Lack of Attention to Work Performance Methods.Training Conducted for Maintenance Personnel ‎ (← links)
  • 05000498/LER-1991-015, :on 910422,train C AFW Pump Inadvertently Started Due to Failure of Led in Sequencer Test Circuitry. Faulty Led Replaced & Blocking Circuit Satisfactorily Tested ‎ (← links)
  • 05000498/LER-1990-001, :on 900103,containment Ventilation Isolation Occurred Due to Loss of Power to Radiation Monitor Actuation Relay.Caused by Technician Lifting Power Lead. Technicians Trained & Counseled ‎ (← links)
  • 05000498/LER-1989-023, :on 891216,standby Diesel Generator 11 Failed Tech Spec Required Operability Test & Declared Inoperable. Caused by Contact Oxidation & Low Contact Pressure.Chiller Auxiliary Relay Cleaned & Adjusted ‎ (← links)
  • 05000498/LER-1990-002, :on 900103,redundant Solenoid Valve Which Actuates Train C Feedwater Valve Failed.Caused by Excessive Particulate Buildup.Solenoids Cleaned & Hydraulic Oil Flushed & Filtered to Remove Particulate ‎ (← links)
  • 05000498/LER-1989-024-01, :on 891226,required Sample from Safety Injection Accumulator 1C of Boron Concentration Not Taken. Caused by Insufficient Administrative Controls to Track Surveillance Tests.Bulletin Will Be Issued ‎ (← links)
  • 05000498/LER-1989-022-01, :on 891205,discovered That ASME Section XI Pressure Test of Train C of Component Cooling Water Sys Not Performed Prior to Returning Sys to Svc.Sys Inoperable from 890909-1206.Test Control Procedures Revised ‎ (← links)
  • 05000498/LER-1989-023-01, :on 891216,standby Diesel Generator 11 Failed Tech Spec Required Operability Test & Attempt to Secure Essential Chiller 12C Resulted in Trip.Caused by Failure of Voltage Regulator.Regulator Returned to Mfg ‎ (← links)
  • 05000498/LER-1989-018, :on 890922,discovered That Const Installation Procedure for Reg Guide 1.97,Rev 2 Instrumentation Did Not Include Details to Ensure Qualification Per 10CFR50.49 or IEEE 323-1974.Caused by Installation Error ‎ (← links)
  • 05000498/LER-1989-021-01, :on 891017,unplanned ESF Actuation of Control Room Ventilation Sys to Recirculation Mode Occurred.Cause Not Determined.Continued Surveillance Will Be Performed.W/ ‎ (← links)
  • 05000498/LER-2019-002-01, Condition Prohibited by Technical Specifications and Loss of Safety Function Due to Inoperable Reactor Head Vent Throttle Valves ‎ (← links)
  • 05000498/LER-1989-017-01, :on 890814,health Physics Personnel Detected Radiation Levels of .3 to .8 Mr/Hr in Auxiliary Steam Line to Liquid Waste Processing Sys Waste Evaporator.Caused by Inadequate Controls & Personnel Error ‎ (← links)
  • 05000498/LER-1989-019-01, :on 890927 & 28,reactor Containment Bldg Atmosphere Grab Samples Not Taken at Least Once Per 24 H as Required by Tech Spec 3.3.3.Caused by No Programmatic Controls in Place.Night Orders Issued ‎ (← links)
  • 05000498/LER-1989-018-01, :on 890922,determined That Const Installation Procedure for Reg Guide 1.97 Category 2 Instrumentation Did Not Include Installation Details.Caused by Improper Design Coordination.Procedure No Longer in Use ‎ (← links)
  • 05000498/LER-1989-020-01, :on 891011,inverter Which Feeds Channel IV Class IE Vital Ac Distribution Panel Failed Causing ESF Actuations in Control Room.Caused by Failure of Bridge Rectifier Circuit.Inverter Repaired ‎ (← links)
  • 05000498/LER-2019-002, Condition Prohibited by Technical Specifications and Loss of Safety Function Due to Inoperable Reactor Head Vent Throttle Valves ‎ (← links)
  • 05000498/LER-2019-001-01, Condition Prohibited by Technical Specifications Due to Inoperable Essential Cooling Water Pump ‎ (← links)
  • 05000498/LER-2019-001, Condition Prohibited by Technical Specifications Due to Inoperable Essential Cooling Water Pump ‎ (← links)
  • 05000498/LER-2018-001, Main Steam Safety Valve as Left Settings Outside of Required Range Contrary to Technical Specifications Due to Inadequate Procedure ‎ (← links)
  • 05000498/LER-1917-002, Regarding Condition Prohibited by Technical Specifications Due to Inoperable Control Room Envelope Makeup Filtration System Heating Coil ‎ (← links)
  • 05000498/LER-1994-007-01, :on 940224,station Procedure for Testing Reactor Trip Bypass Breakers Did Not Satisfy Ts.Caused by Inadequate Procedure Preparation & Review.Surveillance Procedure Enhancement Program Underway ‎ (← links)
  • 05000498/LER-1917-001, Regarding Failure of a Timing Relay During a Technical Specification Surveillance ‎ (← links)
  • 05000498/LER-2016-002, Regarding Automatic Reactor Trip and Auxiliary Feedwater System Actuation Following Turbine Trip Due to Generator Lockout ‎ (← links)
  • 05000498/LER-2016-001, Regarding Manual Reactor Trip Due to Loss of Main Feedwater to C Train Steam Generator When the Steam Generator Feedwater Regulating Valve Failed Closed ‎ (← links)
  • 05000498/LER-2015-001, Regarding Manual Reactor Trip Due to Lowering Steam Generator Levels and Valid Auxiliary Feedwater System Actuation Following a Manual Main Turbine Trip ‎ (← links)
  • 05000498/LER-2014-001, Regarding Overpower Condition Relating to the Ultrasonic Flow Measurement System ‎ (← links)
  • 05000498/LER-2013-003, Regarding Unanalyzed Condition - Direct Current Ammeter Circuits Without Overcurrent Protection ‎ (← links)
  • 05000498/LER-2013-002, Regarding Steam Turbine-Driven Auxiliary Feedwater Pump Flow Regulating Valve Inoperable for Longer than Allowed by Technical Specifications ‎ (← links)
  • 05000498/LER-2013-001, Regarding Delta Temperature/T-Average Channel a Inoperable for Longer than Allowed by Technical Specifications ‎ (← links)
  • 05000498/LER-2012-001, Regarding Instrumentation Channel NI-45A Failed Channel Check ‎ (← links)
  • 05000498/LER-2002-003, Regarding Manual Reactor Trip Due to a Parent Loss of Open Loop Cooling Water System Pressure ‎ (← links)
  • 05000498/LER-2011-001, For South Texas, Unit 1, Regarding Technical Specification Requirement Not Met Regarding Unborated Water Sources ‎ (← links)
  • 05000498/LER-2010-003, Regarding Unit 1 Reactor Trip During Surveillance Testing ‎ (← links)
  • 05000498/LER-2010-001, Unit Shutdown Required by Technical Specifications ‎ (← links)
  • 05000498/LER-2009-002, Regarding Main Steam Isolation Valve Blocked from Closing ‎ (← links)
  • 05000498/LER-2009-001, For South Texas Project, Unit 1 Regarding Oil Reservoir for Essential Chiller 12B Below Required Temperature ‎ (← links)
  • 05000498/LER-2007-003, From South Texas Project, Unit 1, Incorrect Count Rate Board Installed in Extended Range Nuclear Instrumentation Channel ‎ (← links)
  • 05000498/LER-2007-002, From South Texas, Unit 1, Regarding Entry Into TS 3.0.3 for Greater than 1 Hour Due to Inoperable Degraded Voltage Relays ‎ (← links)
  • 05000498/LER-2007-001, Regarding Turbine-Driven Auxiliary Feedwater Pump Failed to Start During Surveillance Testing ‎ (← links)
  • 05000498/LER-2006-006, Re Inoperable Auxiliary Feedwater Flow Instrumentation ‎ (← links)
  • 05000498/LER-2006-005, Re Quadrant Power Tilt Ratio Surveillance Not Performed as Required by TS 3.3.1 Action 2 ‎ (← links)
  • 05000498/LER-2006-004, Re Multiple Main Steam Safety Valves Found Outside Acceptance Criteria ‎ (← links)
  • 05000498/LER-2006-003, Re Control Room Envelope HVAC Makeup Fan 11B Failure to Start ‎ (← links)
  • 05000498/LER-2006-002, Regarding Simultaneous Inoperability of Two Essential Chilled Water Trains ‎ (← links)
  • 05000498/LER-2006-001, Regarding Standby Diesel Generator Failed Surveillance Test Demonstrating Performance at 110% Load ‎ (← links)
  • 05000498/LER-2004-006, Re Pressurizer Power-Operated Relief Valve Being Inoperable for a Time Period Longer than Allowed by Technical Specifications ‎ (← links)
  • 05000498/LER-2004-005, Regarding Standby Diesel Generator 12 Not Being Declared Inoperable While the Auxiliary Feedwater Pump 12 Breaker Cell Switch Was Being Replaced ‎ (← links)
  • 05000498/LER-2004-004, Regarding Deviation from a Licensed Condition Under 10CFR50.54(x) ‎ (← links)
  • 05000498/LER-2004-002, Inoperable Control Room Makeup and Cleanup Filtration Systems ‎ (← links)
  • 05000498/LER-2004-003, An Unanalyzed Condition That Significantly Degraded Plant Safety Due to a Valve Out of Position ‎ (← links)
  • 05000498/LER-2004-001, Regarding Reactor Trip on High Steam Generator Levels Initiated by Failure of Inverter 1201 ‎ (← links)
  • 05000498/LER-2001-003-07, 7 for South Texas, Unit 1 Regarding Failure of Main Steam Power Operated Relief Valves 1B ‎ (← links)
  • 05000498/LER-2003-006, Regarding Unanalyzed Condition That Significantly Degraded Plant Safety Regarding the Natural Circulation Cool Down Rate ‎ (← links)
  • 05000498/LER-2003-005, Regarding Auxiliary Feedwater Pump 11 Breaker Failure to Close ‎ (← links)
  • 05000498/LER-2003-004, Regarding Deviation from a Licensed Condition Under 10CFR50.54(x) ‎ (← links)
  • 05000498/LER-2003-003, Regarding Bottom Mounted Instrumentation Penetrations Indications ‎ (← links)
  • 05000498/LER-2003-002, Manual Reactor Trip Due to Reduced Deaerator Level ‎ (← links)
  • 05000498/LER-2003-001, From South Texas Regarding Partial Loss of Offsite Power to Units 1 & 2 Resulting in Engineered Safety Feature Actuations ‎ (← links)
  • 05000498/LER-2002-004, For South Texas Unit 1 Steam Generator Power Operated Relief Valve Failed to Close on Demand ‎ (← links)
  • 05000498/LER-2002-002, /8/2002, Electrical Auxiliary Building Supply Fans in a Condition That Could Have Prevented Fulfillment of Safety Function ‎ (← links)
  • 05000498/LER-2002-001, Re Control Room Envelope Ventilation System Failed to Maintain a Positive Pressure in the Control Room ‎ (← links)
  • 05000498/LER-2024-006, Condition Prohibited by Technical Specifications and Potential Loss of Safety Function Due to Inoperable Pressurizer Power Operated Relief Valve ‎ (← links)
  • 05000498/LER-2024-007, Condition Prohibited by Technical Specifications ‎ (← links)
  • 05000498/LER-2025-001, Two Inoperable Emergency Core Cooling System Trains Resulting in Potential Loss of Safety Function ‎ (← links)
  • 05000498/LER-2024-007-01, Supplement to Condition Prohibited by Technical Specifications ‎ (← links)
  • 05000498/LER-2024-004-01, Loss of Offsite Power Resulting in Unit 1 Automatic Reactor Trip and Actuation of Emergency Diesel Generators and Auxiliary Feedwater Pumps ‎ (← links)
• ML14119A068 (redirect page) ‎ (← links)
• 05000498/LER-1995-004, :on 950328,failed to Meet Requirements of TS Due to Not Testing Contact of Load Sequencer Relay.Assembled Surveillance Credit Package for All Trains of Engineered Safety Features Diesel loss-of-offsite-power Surveillances ‎ (← links)
• 05000498/LER-2014-001-01, Cancellation of Licensee Event Report (LER) 2014-001-00 and Supplement LER 2014-001-01: Overpower Condition Relating to the Ultrasonic Flow Measurement System (redirect page) ‎ (← links)
  • ML14191A637 (redirect page) ‎ (← links)
• 05000498/LER-2014-001-01 (redirect page) ‎ (← links)
  • ML14135A190 (redirect page) ‎ (← links)
• 05000499/LER-2014-001, Standby Diesel Generator 23 Essential Cooling Water Leak Through the Wall of Aluminum-Bronze Pipe Nipple ‎ (← links)