Pages that link to "05000499/LER-2010-001-01, Essential Cooling Water System Leak"
Jump to navigation
Jump to search
The following pages link to 05000499/LER-2010-001-01, Essential Cooling Water System Leak:
Displayed 15 items.
- 05000499/LER-2010-001 (redirect page) (← links)
- 05000499/LER-2015-001, Technical Specification Action Statement Time Exceeded Due to Turbine-Driven Auxiliary Feedwater Pump Test Failure Not Recognized (← links)
- 05000499/LER-2001-004 (← links)
- 05000499/LER-2001-003 (← links)
- 05000499/LER-2001-002 (← links)
- 05000499/LER-2001-001 (← links)
- IR 05000498/2010004 (← links)
- 05000499/LER-1995-005, Forwards LER 95-005.Event Did Not Have Adverse Effect on Health & Safety of Public,But Clearly Does Not Meet Stds for Expected Performance (← links)
- 05000499/LER-1997-002, Forwards LER 97-002-00,for Hlp Re All Four Steam Generators Being Classified Category C-3 (← links)
- 05000499/LER-1998-002, Forwards LER 98-002-00,re Automatic Reactor Trip Due to low-low Level in SG 2A.Commitments Made by Util Are in Corrective Actions Section (← links)
- 05000499/LER-1997-007, Forwards LER 97-007-00,for Stp,Unit 2 Re Manual Reactor Trip Due to Loss of Inventory in SG 2D.Commitments Listed (← links)
- 05000499/LER-1998-004, Forwards LER 98-004-00,re Completion of Plant SD Required by TS 3.3.2.Commitments Made by Util Are Found in Corrective Action Section of Attachment (← links)
- 05000499/LER-1999-005, Forwards LER 99-005-00,re Esfa Following Loss of Power to Standby Transformer 2 Due to Electrical Fault.Licensee Commitments Are Listed in Corrective Actions Section of LER (← links)
- 05000499/LER-1999-006, Forwards LER 99-006-00,re Entry Into TS 3.0.3.Licensee Commitments Listed in Corrective Actions Section of Attachment (← links)
- 05000499/LER-2024-002, Two Control Room Envelope HVAC Trains Inoperable Resulting in a Condition That Could Have Prevented Fulfillment of a Safety Function (← links)
- 05000499/LER-2024-001-01, Supplement to Automatic Reactor Trip and Actuation of Two of Three Emergency Diesel Generators (← links)
- 05000499/LER-2024-003, Containment Isolation Valve Inoperable Resulting in Condition Prohibited by Technical Specification and Prevention of Fulfillment of Safety Function (← links)
- 05000499/LER-2024-001, Automatic Reactor Trip and Actuation of Two of Three Emergency Diesel Generators (← links)
- 05000499/LER-2023-002, Automatic Actuation of Emergency Diesel Generator Due to Lockout of Switchyard Electrical Bus (← links)
- 05000499/LER-2023-001, Two Essential Chilled Water Trains Inoperable Resulting in a Condition That Could Have Prevented Fulfillment of a Safety Function (← links)
- 05000499/LER-2021-002-01, Supplement to Condition Prohibited by Technical Specifications Due to Inoperable Train of Essential Core Cooling System and Containment Spray System (← links)
- 05000499/LER-2022-001, From South Texas Project Unit 2, Automatic Actuation of Emergency Diesel Generator Due to Lockout of Switchyard Electrical Bus (← links)
- 05000499/LER-2021-002, Re Condition Prohibited by Technical Specifications Due to Inoperable Train of Essential Core Cooling System and Containment Spray System (← links)
- 05000499/LER-2021-001, Condition Prohibited by Technical Specifications Due to Inoperable Containment Isolation Valve (← links)
- 05000499/LER-1989-020, :on 890829,all Three Operating Turbine Driven Feedwater Pumps Tripped.Caused by Momentary Interruption of Control Power to Feedwater Pump Overspeed Protection Circuits Due to Failure of Inverter (← links)
- 05000499/LER-1989-019, :on 890823,reactor Trip Occurred Due to Full Closure of Feedwater Isolation Valve During Partial Stroke Testing.Caused by Failure in Feedwater Isolation Valve Control Circuit.Troubleshooting Performed (← links)
- 05000499/LER-1989-014, :on 890418,loss of Offsite Power Occurred to Main & Auxiliary Transformers,Resulting in Loss of Power to Train a 4.16 Kv ESF Bus E2A.Caused by Loss of Switchyard Breakers Feeding Transformers.Meter Removed (← links)
- 05000499/LER-1989-012, :on 890414,radiation Monitor on Fuel Handling Bldg Exhaust Air Duct Went Into High Alarm & Actuated HVAC Sys.Caused by Clogged Filter on Radiation Monitor.Sample Lines from Duct to Monitor Will Be Checked (← links)
- 05000499/LER-1989-013, :on 890415,reactor Trip Occurred & Train Reactor Trip Opened Unexpectedly.Cause Unknown.Reactor Brought to Orderly Shutdown.Reactor Trip Breakers & Asscociated Circuitry Tested (← links)
- 05000499/LER-1989-018, :on 890802,control Room Ventilation Sys Actuated to Recirculation Mode as Result of High Level Trip of Vinyl Acetate Channel on Toxic Gas Analyzer.Caused by Failure of Positioner.Analyzer Replaced (← links)
- 05000499/LER-1989-011-01, :on 890410,reactor Trip & Safety Injection Actuation Occurred on Low Steam Line Pressure.Caused by Operator Skipping Two Steps in Heatup Procedure & Increasing RCS Pressure.Operator Counseled (← links)
- 05000499/LER-1989-010, :on 890408,noted That One Channel of Extended Range Neutron Flux Monitor Out of Svc When Shutdown Banks Withdrawn on 890407.Caused by Personnel Error.Night Orders Issued to Operating Crews (← links)
- 05000499/LER-1989-009-01, :on 890405,reactor Trip & Loss of Offsite Power on Auxiliary Buses & 4.16-kV Train a ESF Bus Occurred, Resulting in Actuation of Auxiliary Feedwater.Caused by Improper Installation of Relay Wiring (← links)
- 05000499/LER-1989-016, :on 890602,reactor Trip Occurred on Completion of Two Out of Four Logic for Closed Turbine Inlet Throttle Valves.Caused by Deficient Test Procedure.Turbine Inlet Valve Test Procedure Revised.Part 21 Related (← links)
- 05000499/LER-1989-017, :on 890713,internal Fault Occurred in Main step-up Transformer 2A.Caused by Failure of Phase a High Voltage Bushing in Transformer.Transformer Returned to Mfg for Repair & Further Failure Analysis (← links)
- 05000499/LER-1989-006-01, :on 890313,discovered That post-maint Test Performed on 890313 Did Not Satisfy Tech Specs Requirements. Caused by Personnel Error.Relays Retested & Maint Supervisor Briefed on Implementation of Procedures (← links)
- 05000499/LER-1989-005-01, :on 890320,partial Loss of Offsite Power Due to Failure of Lightning Arrestor.Power to 4.16 Kv ESF Busses E2B & E2C Lossed.Lightning Arrestor Replaced & Will Be Returned to Mfg for Failure Analysis (← links)
- 05000499/LER-1989-008-01, :on 890323,discovered That ASME Section XI Stroke Time Test on Steam Generator 2D Power Operated Relief Valve Not Performed.Caused by Personnel Error.Surveillance Database Revised & Past Surveillances Reviewed (← links)
- 05000499/LER-1989-007-01, :on 890322,discovered That Interconnecting Wire Which Bypassed High Chemical Level ESFs Actuation of Control Room HVAC Sys.Caused by Personnel Error.Wire Removed & Maint Work Control Procedures Revised (← links)
- 05000499/LER-1989-015, :on 890512,operator Discovered That One Channel of Pressurizer Level Indication Was Fluctuating & Did Not Agree W/Other Operable Channels.Caused by Stuck Closed Kerostat Right Angle Diaphragm Isolation Valve (← links)
- 05000499/LER-1989-004-01, :on 890206,radiation Monitor on Fuel Handling Bldg (Fhb) Exhaust Air Duct Went Into High Alarm & Actuated Fhb HVAC to Filtered Exhaust Mode.Cause Unknown.Actuated & Redundant Monitor Confirmed to Be in Calibr (← links)
- 05000499/LER-1989-003-01, :on 890203,partial Loss of Offsite Power Occurred on 4.16 Kv ESF Train C Bus.Caused by Misoperation of Brown Boveri Model ITE87T Transformer & Mfg Defect.Relay Replaced & Train C Bus Restored (← links)
- 05000499/LER-1999-006-01, :on 990901,TS 3.0.3 Entered.Caused by Insufficient Procedural Guidance for Use of TS 3.0.6.SG 2D low-level Channel 2 Input Relay to ESF Actuation Logic Circuitry Replaced on 990901 (← links)
- 05000499/LER-1999-005-01, :on 990824,ESFA Following Loss of Power to Standby Transformer 2 Was Noted.Internal Fault Caused C Phase Arrester Failure.Replaced All Surge Arresters for Standby Transformer 2 (← links)
- 05000499/LER-1999-002, :on 990121,Unit 2 Experienced Automatic Reactor Trip Due to Closure of Turbine Throttle Valves.Caused by Inadequate self-verification by Individual.Operations Mgt Has Briefed All Operations Personnel (← links)
- 05000499/LER-1999-004, :on 990406,power Was Not Available to Enable Closure of Personnel Air Lock within 30 Minutes Per TS 3.9.4.Caused Temporary Mod to Provide Power to Personnel Airlock.Note Has Been Added to Outage Notes (← links)
- 05000499/LER-1999-003, :on 990312,ESFA & Entry Into TS 3.0.3 Occurred Following Partial Loss of Offsite Power.Caused by Failure of Switchyard Breaker.Licensee Provided Addl Training on Importance of Conducting Appropriate Functional Tests (← links)
- 05000499/LER-1997-007-01, :on 971121,manual Reactor Trip Occurred.Caused by Two Separate Failure Mechanisms That Combined to Result in Loss of Power to Cabinet.Failed Voltage to Pulse Converter Circuit Card Was Replaced (← links)
- 05000499/LER-1998-001, :on 980115,failure to Meet TS Requirements for Inoperable Sdg 21 Noted.Caused by Failure of U3 Operational Amplifier in DG Voltage Regulator Circuit.Replaced Voltage Regulator Board for Sdg 21 & Complete Post Maint Test (← links)
- 05000499/LER-1998-004-01, :on 981228,plant Was Shutdown Required by TS 3.3.2.Caused by Failure in Ssps Test Circuitry.Testing Circuit Card Was Replaced (← links)
- 05000499/LER-1998-003-01, :on 981016,discovered Missed Tube Insp in SG 2B,per TS Surveillance 4.4.5.2.Caused by Lack of Addl Controls to Prevent Re SG Tube Insp Data.Licensee Revised 2FE05 Insp Records & SG Insp Database.With (← links)
- 05000499/LER-1998-002-01, :on 980922,automatic RT Occurred Due to low-low Level in SG 2A.Caused by Failure to Adequately Verify Technical Accuracy of Changes Made to Original Work Instructions.Reviewed Other Similar Work in Progress (← links)
- 05000499/LER-1997-006, :on 970430,manual Reactor Trip Occurred.Caused by Malfunctioning Main Feedwater Regulating Valve.Main 2D Feedwater Regulating Valve controller-driver Card Replaced & Control Circuit Tested Satisfactorily (← links)
- 05000499/LER-1997-003, :on 970224,TS SR 4.5.2 Was Not Met When Loose Debris Was Discovered in Reactor Containment Bldg.Caused by Failure to Communicate Mgts Expectation.Loose Debris Was Removed (← links)
- 05000499/LER-1997-003-01, Forwards LER 97-003-01,failure to Meet Requirements of TS 4.5.2.c Re Surveillance Insp of Containment for Loose Debris (← links)
- 05000499/LER-1997-005, :on 970326,manual Unit Trip Occurred Due to Lowering SG Level.Failed seal-in Relay Was Replaced & Verified That Other seal-in Relays Affecting MFRVs in Both Units 1 & 2 Had Proper Coil Resistances (← links)
- 05000499/LER-1997-004-01, :on 970319,unit Trip Occurred While Performing Main Turbine Testing Due to Intermittent Failure of Inverter Power Supply for Channel Two Automatic Stop Trip Valve. Inverter Power Supply Was Replaced (← links)
- 05000499/LER-1997-002-01, :on 970215,Steam Generators 2A Eddy Current Insp Results Fell Into Category C-3.Caused by Stress Corrosion Cracking at tube-to-tube Support Plate.Sg Tubes Were Plugged in Four Unit 2 Steam Generators (← links)
- 05000499/LER-1997-001-01, :on 970205,main Steam Safety Valve Setpoints Discovered Outside Required Tolerance Occurred.Caused by MSSV Above & Beyond Previously Documented Setpoint Drift. Lift Setting of Five MSSV Were Adjusted (← links)
- 05000499/LER-1996-003, :on 960828,failure to Fully Meet Requirements of TS Occurred,Due to Discovery of Improperly Installed Jumper on Main Steam Line Pressure Lead/Lag Circuit Card. Personnel Issues Have Been Addressed (← links)
- 05000499/LER-1992-010-01, :on 921227,reactor Manually Tripped Due to Closure of Train D Feedwater Regulating Valve.Caused by Card Failure in Westinghouse 7300 Control Sys.Evaluation of Power Supply Failure Mode & Reliability Performed (← links)
- 05000499/LER-1992-009-01, :on 921217,determined That Erfdads Host Monitor Had Been Receiving Garbled Data Due to Faulty Modem Associated W/Toxic Gas Monitor XE-9326.Replaced Faulty Modem Verifying That Sys Was Operating Properly (← links)
- 05000499/LER-1992-007-01, Forwards LER 92-007-01 Re Unplanned ESF Actuation of Isolation Valve for above-seat Drain Line.Rev Addresses Results of Troubleshooting in Effort to Replicate Conditions Reported to Determine Cause of Event (← links)
- 05000499/LER-1991-010-01, :on 911224,pressurizer Spray Valve PCV-655C Failed Open,Resulting in Automatic Reactor Trip & SI Actuation on Low Pressure.Caused by Disengagement of Feedback Arm Linkage.Locking Nuts Added (← links)
- 05000499/LER-1992-008-01, :on 920915,CR Toxic Gas non-ESF Alarm Received & Redundant Actuator Did Not Actuate.Caused by Failed Infared Source.Gas Analyzers Will Be Replaced w/state-of- the-art During Next Scheduled Outage (← links)
- 05000499/LER-1996-002, :on 960314,fuel Handling Bldg Exhaust Air Damper Inoperable Due to Inappropriate Design Implementation.Made Mods to Fuel Handling Bldg Emergency Exhaust Dampers to Resolve Issue (← links)
- 05000499/LER-1992-005, :on 920508,CVI Actuation Occurred Due to Failure in RM-23A Module.Definite Cause of Equipment Failure Has Not Been established.RM-23A Module Replaced & Review of Module Maint History Performed (← links)
- 05000499/LER-1992-005-01, :on 920608,inadvertent Start of Component Cooling Water Pump Occurred When Discharge Header Pressure Went Below Setpoint for Starting Standby Pump.Caused by Inadequate Procedure.Procedures to Be Changed (← links)
- 05000499/LER-1992-006, :on 920522,component Cooling Water Outlet Valve from RHR HX 2C Opened & Header Pressure Decreased & Pump 2A Automatically Started.Possibly Caused by Loss of Power to Solenoid Valve.Visual Insp of Valve Performed (← links)
- 05000499/LER-1996-001, :on 960119,TS 3.0.3 Entry Occurred Due to Two MFW Isolation Valves Being Inoperable at Same Time.Discussed Enhanced Mgt Expectations W/Emphasis on Clear & Concise Communications (← links)
- 05000499/LER-1995-006-01, :on 950905,failure to Fully Meet Requirements of TSs Occurred Due to Not Placing Control Room Envelope HVAC Sys in Required Mode.Individual Involved Counseled.W/ (← links)
- 05000499/LER-1992-004, :on 920428,TS 3.0.3 Entered Due to Containment Isolation Valves Failing to Close.Cause Not Determined.Ts Change Evaluated to Allow Credit for SG Tubes,Tubesheet & Shell as Isolation Barrier (← links)
- 05000499/LER-1995-004, :on 950404,TS 3.0.3 Entered Due to Inoperability of Digital Rod Position Indication Sys.Caused by Loose Connection of Control Wire Internal to Automatic Transfer Switch.Wire Reterminated (← links)
- 05000499/LER-1995-008-01, :on 951115,experienced Reactor Trip & Turbine Trip Due to Loss of Generator Excitation.Replaced All Exciter Rectifier Diode/Fuse Modules & Inspected Unit 1 Turbine Generator for Similar Problems (← links)
- 05000499/LER-1992-003, :on 920224,feedwater Flow Oscillations Observed on turbine-driven SG Feedwater Pump 23,resulting in Reactor Trip.Caused by Rain Water Leaking Through Expansion Joints.Control Sys Dried Out (← links)
- 05000499/LER-1995-007-01, :on 951017,TS Were Not Met Due to Failure to Identify All TS LCO Requirements for Components Affected by Electrical Bus Outage.Discussed Lessons Learned W/Individuals Involved (← links)
- 05000499/LER-1992-001, :on 920122,reactor Trip Occurred Due to High Neutron Flux Negative Rate.Troubleshooting of Pressurizer Backup Heater 2A Identified No Problems & Faulty Diode CR1 Replaced (← links)
- 05000499/LER-1992-002, :on 920122,over Temp Delta Temp Trip Occurred. Caused by Personnel Error.Stp Setpoint Methodology Changed to Incorporate Current Changes to Safety Analyses (← links)
- 05000499/LER-1991-005, :on 910411,automatic ESF Actuation of Control Room Envelope HVAC Trains B & C to Emergency Mode Occurred. Cause Not Determined.Plant Records Reviewed & Root Cause Analysis Performed (← links)
- 05000499/LER-1991-009-02, :on 910707,ESF Actuation Occurred.Caused by Failed Light Emitting Diode.Engineering Review Conducted Determining Generic Problem Exists W/Leds Used in Sequencer Circuits (← links)
- 05000499/LER-1995-002, :on 950131,pressurizer Level Channel LT-0467 Was Considered Inoperable Due to Use of Incorrect Calibr Correction Factor.Provided up-to-date Controlled Scaling Document for Affected Pressurizer Level Transmitter (← links)
- 05000499/LER-1995-004-01, :on 950404,digital Rod Position Indication Panel Experienced LOP During Transfer of Load to Voltage Regulated Transformer.Caused by Failure of Automatic Transfer Switch.Switch Manually Transferred (← links)
- 05000499/LER-1995-003-01, :on 950328,RT on Over Temp/Delta Temp Due to Failed Fuse Holder.Replaced Defective Fuse & Fuse Holder (← links)
- 05000499/LER-1995-001-01, :on 950119,potential Slight Degradation of Decay Heat Removal Capacity Via Natural Circulation Occurred.Caused by Failure to Fully Evaluate Thermodymanic TS Bases for Using Sg.Operators Briefed (← links)
- 05000499/LER-1995-002-01, :on 950131,pressurizer Level Channel LT-0467 Considered Inoperable Due to Use of Incorrect Calibr Correction factor.Up-to-date Controlled Scaling Document Has Been Provided for Affected Pressurizer Level Transmitter (← links)
- 05000499/LER-1991-009-01, :on 910525 & 26,containment Ventilation Isolations Occurred.Caused by Faulty RM-23 Module Associated W/One of Two Purge Exhaust Radiation Monitors. Module Replaced,Tested & Returned to Svc (← links)
- 05000499/LER-1991-006-01, :on 910516 & 21,control Room Ventilation Sys Actuated to Recirculation Mode Due to Supurious Trip from Toxic Gas Analyzer.Possibly Caused by Poor Electrical Connection on Circuit Chips.Chips Reseated (← links)
- 05000499/LER-1993-011, :on 930401,pressure Safety Valve (Psv) & MSSV Setpoints Found Outside Required Tolerance Due to Industry Known Problem Re Setpoint Drift.Test Procedure to Test Psv Lift Setpoint on Saturated Steam Modified (← links)
- 05000499/LER-1991-005-01, :on 910411,ESF Actuation of Control Room Envelope HVAC Trains B & C.Cause Unknown.Addl Root Cause Analysis Using Change Analysis Techniques Performed for This & Similar Actuations (← links)
- 05000499/LER-1991-004-01, :on 910330,switchyard Breaker Closed to Energize Main & Auxiliary Transformers,Resulting in Turbine & Reactor Trip.Caused by Differences in Saturation Rates for Transformers.Temporary Mod Installed (← links)
- 05000499/LER-1993-006, :on 930217,TS Violated Due to Train a Cold Leg Injection MOV Being Inoperable for Greaterthan 72 H.Adequacy of Programmatic Controls Re Operability Determination Evaluated & Enhancements Made (← links)
- 05000499/LER-1991-003-01, :on 910314,reactor Trip Occurred Due to Actuation of Generator Protective Relay.Caused by Inadequate Operating Procedures.Procedures Revised & Event Included in Requalification Training (← links)
- 05000499/LER-1994-007-02, :on 940625,main Transformer Lockout Relay Actuated.Caused by Failure of Capacitor within Pilot Wire Relay.Annunciator Response Procedures Have Been Revised & Faulty Pilot Wire Relay Was Replaced (← links)
- 05000499/LER-1994-005-02, :on 940607,standby Diesel Generator 22 Had Received Unexpected Test Mode Start Signal.Caused by Voltage Spike Generated by Emergency Fuel Oil Solenoid Deenergizing. Replaced Parts Found to Be Weak (← links)
- 05000499/LER-1994-006-01, :on 940711,discovered That Sp Used to Verify Operability of Accident Monitoring Instrumentation & Remote Shutdown Monitoring Instrumentation Inadequate.Sp Revised.W/ (← links)
- 05000499/LER-1991-002-01, :on 910131,discovered That ASME Section XI Pressure Test of Completed Work Package for Weld Repairs on AFW Pump 24 Steam Supply Line Not Performed.Caused by Inadequate Procedures.Procedures Revised (← links)
- 05000499/LER-1994-002-02, :on 940302,Piston 4R Was Discovered Damaged During Insp Due to Piston Failure Foreign Material or Trapped Wear Particles Between Piston & Liner.Piston & Cylinder Liner for Cylinder 4R Were Replaced (← links)
- 05000499/LER-1994-004-01, :on 940512,SG hi-hi Level (P-14) Signal Generated While Performing RTD Cross Calibrs Due to Filling SG to Approx 90% Full.Crew Briefings Discussing Event Conducted (← links)
- 05000499/LER-1994-003-01, :on 940429,inadvertent Test Mode Start of Standby DG 21 & 22 Occurred Due to fiber-optic Board Susceptibility to Noise in Conjunction W/Transient DC Spikes.Maint for Boards Initiated (← links)
- 05000499/LER-1993-013, :on 930719,inadvertent ESF Actuation Occurred Due to Component Cooling Water Pump Start During Maint Work Activity.Caused by Inadequate Plant Inpact Review.Time Delay Placed in CCW Pump (← links)
- 05000499/LER-1991-001, :on 910109,feedwater Isolation Valve Closed During Investigation of Low Nitrogen & Hydraulic Pressure Alarms.Caused by Personnel Error & Inadequate Procedure. Licensed & non-licensed Operators Trained (← links)
- 05000499/LER-1990-008, :on 900508,determined That Small Pressure Boundary Leak Existed on ASME Class 2 Steam Generator C Lower Head Drain Line.Caused by High Cycle Failure Fatigue on Weld on Upstream Side.Drain Valves Replaced (← links)
- 05000499/LER-1990-008-01, Forwards LER 90-008-01 Re Plant Shutdown Due to Primary Leakage from Steam Generator Bowl Drain Assembly.Initial Corrective Actions Re Permanent Design Change for Drain Valves May Be Reconsidered (← links)
- 05000499/LER-1990-018-01, :on 901107,during Performance of Surveillance Procedure for Safety TS Requirements Unexplained ESF Actuations Occurred (← links)
- 05000499/LER-1994-001-01, :on 940301,SDG 21 Experienced Inadvertent Start.Caused by Weakened Transistor in non-1E Fiber Optic Start Circuits & Faulty Power Supply (PS-2).Fiber Optic Boards G,C & J & PS-2 Power Supply Replaced (← links)
- 05000499/LER-1990-015-01, :on 901026,control Room Ventilation Actuation Occurred Due to Spurious Signal from Toxic Gas Monitor (← links)
- 05000499/LER-1990-014-01, :on 900926,containment Ventilation Isolation Actuation Occurred Due to Improper Use of Test Equipment During Monthly Surveillance on Spent Fuel Pool Radiation Monitors (← links)
- 05000499/LER-1990-012-01, :on 900713,ESF Actuation Occurred Due to Failed Open Feedwater Regulating Valve.Caused by Detached Positioner Feedback Linkage Arm.Training Bulletin Issued to Reemphasize Importance of Tightening Screws (← links)
- 05000499/LER-1993-008, On 930505,discovered Failure to Maintain Enviromental Qualifications of a RHR Motor Operated Valve.Caused by Lack of Knowledge Regarding Requirements to Maintain Environ Qualifications (← links)
- 05000499/LER-1992-009, :on 921217,TS Surveillance Requirements Were Missed Due to Faulty Toxic Gas Monitoring Sys Modem.Replaced Faulty Modem & Verified Sys Operating Properly (← links)
- 05000499/LER-1990-011-01, :on 900628,discovered That Steam Generator PORV 2D Did Not Meet Stroke Time Requirements & on 900705, Shut Down of Unit Commenced for Maint Outage.Caused by Chemical Breakdown of Hydraulic Fluid (← links)
- 05000499/LER-1992-007-02, Forwards LER 92-007-02 Re Unplanned Esfa of Isolation Valve for Above Seat Drain Line (← links)
- 05000499/LER-1993-016-01, :on 931031,train a CCW Pump Received Start Signal When Ccw/Ecw Train a Mode Selector Switch Inadvertently Switched to Run Position Due to Personnel Error.Personnel Involved in Incident Counseled (← links)
- 05000499/LER-1993-015-02, :on 931019,inadvertent Start of Standby Diesel Generator 22 Occurred Due to Spurious Operation of Transistor.Ventilation Fans Installed in All Standby DG Control Cabinets (← links)
- 05000499/LER-1990-013-01, :on 900917,reactor Trip Occurred During Performance of Train Reactor Trip Breaker Trip Actuating Device Operational Test (← links)
- 05000499/LER-1993-013-01, :on 930719,Train B CCW Pump 2B Received Automatic Actuation Signal from non-nuclear Supply Header Low Pressure Signal Due to Less than Adequate Plant Impact review.M0V-0236 Repaired (← links)
- 05000499/LER-1993-012-01, :on 930614,lost Spent Fuel Pool Cooling for Approx 13 Hours Due to Insufficient Control Board Awareness. Design Change to Install Annunciator in Control Room to Inform of Loss of Spent Fuel Cooling (← links)
- 05000499/LER-1993-011-01, :on 930401,pressurizer Safety Valve Setpoints Found Outside Required TS Tolerance.Caused by Setpoint Drift Due to Inherent Valve Characteristics.Mod of Test Procedures Underway (← links)
- 05000499/LER-1993-010-01, :on 930526,discovered That Screen Drive Coupling on Essential Cooling Water Traveling Screen 2A Damaged.Caused by Aging of Elastomeric Element.Couplings Replaced & Preventive Maint Initiated (← links)
- 05000499/LER-1993-008-01, :on 930505,heat Removal Motor Operated Valve Inoperable in Excess of Allowable Outage Time.Caused by Failure to Recognize Condition.Condition Corrected by Replacing T Drain (← links)
- 05000499/LER-1993-009-01, :on 930426,Tech Spec Violation Occurred Due to Use of Inappropriate Ref Value Data for RHR Pump Inservice Test.Surveillance Procedures Revised to Include Appropriate Ref Values (← links)
- 05000499/LER-1993-005, :on 930214,control Room Operator Left CR Unmanned During Mode 4 Operation for 41 S.Caused by Inappropriate Action by Unit Supervisor.Event Will Be Included in Licensed Operator Requalification Training (← links)
- 05000499/LER-1993-005-01, Forwards LER 93-005-01 Re CR Unmanned by Senior Licensed Operator During Mode 4 Operation.Original Due Date of 930501 to Complete Command & Control Discussions Not Met. Discussions W/Remaining Personnel to Be Complete by 930 (← links)
- 05000499/LER-1990-010-01, :on 900515,unplanned Actuation of ESF Train C Standby Diesel Generator Occurred.Caused by Personnel Error. Training Bulletin Will Be Issued to Maint Personnel Re Event (← links)
- 05000499/LER-1990-009, :on 900512,incorrect Wiring in Solid State Protection Sys Discovered.Caused by Inadvertent Installation of Extra Wire by Mfg.Extra Wire Removed & Sys Successfully Tested (← links)
- 05000499/LER-1990-007, :on 900426,standby Diesel Generator 22 Room High Sump Level Alarm Actuated in Control Room.Caused by Flooding & Inadequate Spec of Sealing & Testing Requirements.Seals on Removable Panels Caulked (← links)
- 05000499/LER-1990-006, :on 900426,control Room Ventilation Sys Actuated to Recirculation Mode Due to High Level Trip of Vinyl Acetate Channel on Gas Analyzer.Caused by Failure of electro-mechanical Positioner.Part Replaced (← links)
- 05000499/LER-1990-005-01, :on 900414,simultaneous Reactor & Turbine Trip Occurred Due to Failure of Main Turbine Electrohydraulic Control Line.Caused by Fatigue Stress of Weld.Valve Modified to Add anti-swirl Baffles & anti-rotation Pins (← links)
- 05000499/LER-1993-001, :on 930123,unit Automatically Tripped from Full Power Due to Turbine Trip Above P-9 Setpoint as Result of Depressurization of electro-hydraulic Control Supply Header. Failed Line & Differential Transformer Replaced (← links)
- 05000499/LER-1993-001-01, Forwards LER 93-001-01 Re Reactor Trip Due to Failure of Main Turbine electro-hydraulic Control Line.Rev Includes Results of Failure Analyses Performed on Failed Control Line & Linear Variable Differential Transformer (← links)
- 05000499/LER-1993-007-01, :on 930310,determined That Control Room Envelope HVAC Sys Was Not in Mode of Operation Required by TS 3.7.7a & 3.3.3.7b.Caused by Implementation & Use of Computer Program.Review Will Be Performed (← links)
- 05000499/LER-1992-004-01, Forwards LER 92-004-01 Re Entry Into TS 3.0.3 Due to Containment Isolation Valves Failing to Closure.Rev Incorporates Results of Root Cause Analysis Performed on Two Containment Isolation Valves (← links)
- 05000499/LER-1993-007, Reactor Trip Due to Low SG Water Level.Corrective Actions Will Be Addressed in LER 93-007 (← links)
- 05000499/LER-1993-004-01, :on 930203,Unit 2 Experienced Automatic Reactor Trip Due to Low SG Water Level.Caused by Ineffective Action to Correct Failures of Startup SG Feedwater Pumps.Startup Feedwater Pump Seals Will Be Modified (← links)
- 05000499/LER-1993-003-01, :on 930203,unit Entered TS 3.0.3 Due to Loss of Drpi Sys.Caused by Malfunction of Transfer Switch.Design Change Will Be Implemented to Remove Load Associated W/ RT-8010A by 930405 (← links)
- 05000499/LER-1993-002-01, :on 930128,unplanned ESF Actuation of Ecw Screen Wash Booster Pump Occurred.Caused by PM Instruction Not Specifically Stating Correct Equipment to Use for Application.Pm Instructions Will Be Revised (← links)
- 05000499/LER-1990-004-01, :on 900326,reactor Trip Occurred on Low Steam Generator (SG) Level.Caused by Mechanical Failure of SG Main Feedwater Regulating Valve.Feedwater Regulating Valve Stems Welded to Plugs to Prevent Rotation (← links)
- 05000499/LER-1990-017-01, :on 901104,discovered That Train a of Class IE 120-volt Distribution Panel DP001 Energized from Alternate Power Supply.Caused by Less than Adequate Administrative Controls.Log Will Be Utilized (← links)
- 05000499/LER-1990-003, :on 900214,discovered That Train B Fuel Handling Bldg Exhaust Air Filter Outlet Damper Would Not Open.Caused by Wiring Error Due to Failure of Technicians to Follow Work Instructions.Technicians Counseled (← links)
- 05000499/LER-1990-002-01, :on 900202,Train Reactor Trip Breaker Opened, Initiating Turbine & Reactor Trip & Feedwater Isolation on Low Average RCS Temp.Cause Unknown.Universal Logic Cards Replaced & Monitoring Instruments Installed (← links)
- 05000499/LER-1990-001-01, :on 900108,Train Low Steam Line Pressure Blocking Switch Placed in Blocked Position,Causing Actuation of Safety Injection & ESF Sys.Caused by Lack of Instructions.Training Program Modified (← links)
- 05000499/LER-1989-028, :on 891130,control Room Ventilation Sys Actuated to Recirculation Mode as Result of Spurious Signal. Caused by Memory Error Causing Microprocessor to Energize Relay Incorrectly.Troubleshooting Planned (← links)
- 05000499/LER-2019-002, 0 for South Texas Project Unit 2, Incorrect Sequencer Part Replacement Leads to Undervoltage Signal and Valid Actuation of Emergency Diesel Generator (← links)
- 05000499/LER-1989-027, :on 891025,discovered That Closed Limit Switch on Main Turbine Throttle Valve 2 Disconnected.Caused by Failure of Limit Switch Linkage.Review to Be Performed of Limit Switch Linkage Design (← links)
- 05000499/LER-1989-026, :on 891013,reactor Trip Occurred Due to High Neutron Flux Negative Rate on Two of Four power-range Neutron Monitoring Channels.Caused by High Resistance Connection on Gripper Diode.Diode Replaced (← links)
- 05000499/LER-1989-025, :on 891006,channel in power-range Nuclear Instrumentation Improperly Calibr,Rendering Channel Inoperable.Caused by Inadequate Technician Training.Maint Qualification Program Developed (← links)
- 05000499/LER-1989-022, :on 890919,overtemp Delta Temp Turbine Runback Occurred,Resulting in Reactor Trip.Caused by Turbine Setpoint Design Intolerance of Small Temp Deviations.Runback Feature Disabled & Analysis Performed (← links)
- 05000499/LER-1989-024, :on 890528,essential Chiller Not Restored to Svc within 72 H Time Limit Specified in Tech Spec.Caused by Incorrect Decision by Mgt Personnel.Operations Personnel Briefed Re Event & Procedure Revs (← links)
- 05000499/LER-1989-021, :on 890905,reactor Trip & Auxiliary Feedwater Sys Actuation Occurred.Caused by Defective Pump 22 Speed Controller Card Edge Connector.Defective Card Edge Connector Repaired & Card Frame Alignment Checked (← links)
- 05000499/LER-1989-023, :on 890922,turbine Trip Occurred on Loss of Power to Four Main Turbine Auto Stop Solenoids.Caused by Failure of Capacitor on Dc to Dc Converter Board in nonsafety-related Inverter.Inverter Repaired (← links)
- 05000499/LER-2019-001, Equipment Clearance Order Error Leads to Loss of Primary Containment Integrity (← links)
- 05000499/LER-2018-001-01, Supplement to Unit 2 Condition Prohibited by Technical Specifications That Could Have Prevented the Fulfillment of a Safety Function Due to Two Inoperable Extended Range Monitors (← links)
- 05000499/LER-2018-001, Condition Prohibited by Technical Specifications That Could Have Prevented the Fulfillment of a Safety Function Due to Two Inoperable Extended Range Monitors (← links)
- 05000499/LER-2011-003, Regarding Unit 2 Plant Mode Change with Turbine Trip Disabled (← links)
- 05000499/LER-2015-001, Regarding Technical Specification Action Statement Time Exceeded Due to Turbine-Driven Auxiliary Feedwater Pump Test Failure Not Recognized (← links)
- 05000499/LER-2014-001, Standby Diesel Generator 23 Essential Cooling Water Leak Through the Wall of Aluminum-Bronze Pipe Nipple (← links)
- 05000499/LER-2013-004, South Texes Project, Unit 2 Regarding Manual Actuation of Main Steam Isolation Valves That Was Not Part of a Preplanned Sequence During Testing or Reactor Operation (← links)
- 05000499/LER-2013-003, Regarding Operational Mode Change Prohibited by Limiting Condition for Operation 3.0.4 with Limiting Conditions for Operation Unknowingly Not Met for Inoperable Essential Cooling Water Pump (← links)
- 05000499/LER-2013-002, Regarding Reactor Trip Due to Main Transformer Lockout Relay Trip (← links)
- 05000499/LER-2013-001, Regarding Manual Reactor Trip Due to Dropped Rods M8 and D8 (← links)
- 05000499/LER-2011-002, Regarding Reactor Trip on Main Generator Lockout (← links)
- 05000499/LER-2011-001, For South Texas, Unit 2, Regarding Exceeding ESF Bus Voltage Technical Specification Surveillance Acceptance Criteria (← links)
- 05000499/LER-2010-005-02, Regarding Startup Feed Pump 24 Breaker Failure and Unit 2 Reactor Trip (← links)
- 05000499/LER-2010-005-01, For South Texas Project Unit 2, Regarding Startup Feed Pump 24 Breaker Failure and Unit 2 Reactor Trip (← links)
- 05000499/LER-2010-006, Regarding Technical Specifications Not Met for Reactor Coolant System Unidentified Leakage (← links)
- 05000499/LER-2010-005, Regarding Startup Feed Pump 24 Breaker Failure and Unit 2 Reactor Trip (← links)
- 05000499/LER-2010-004, Loss of the Train a Essential Cooling Water (Ecw) System Due to a Loss of the Ecw Intake Structure Ventilation Fan 21A (← links)
- 05000499/LER-2010-003, Regarding Containment Purge in Operation When Not Permitted by Technical Specifications (← links)
- 05000499/LER-2010-001-01, Essential Cooling Water System Leak (← links)
- 05000499/LER-2010-002, Regarding Unanalyzed Condition Regarding the Fire Protection System (← links)
- 05000499/LER-2002-201, 0-001 for South Texas, Unit 2 Regarding Essential Cooling Water System Leak (← links)
- 05000499/LER-2009-001, Regarding Essential Chiller 22A Trip on Low Oil Pressure (← links)
- 05000499/LER-2008-003, Regarding Inoperable Component Cooling Water Train (← links)
- 05000499/LER-2008-002, Regarding Valid Actuation of Safety Systems (← links)
- 05000499/LER-2008-001, Regarding Incorrectly Stored Fuel Assembly in Spent Fuel Pool (← links)
- 05000499/LER-2007-001, From South Texas Project Unit 2 Re Auxiliary Feedwater Pump Inoperable Longer than Allowed Under Technical Specifications (← links)
- 05000499/LER-2006-001, Regarding Safety Injection Train Inoperable Longer than Allowed Under Technical Specifications (← links)
- 05000499/LER-2005-005, Re 125 Vdc Switchboard De-Energized Without Placing Fhb HVAC in Emergency Recirculation Mode (← links)
- 05000499/LER-2005-006, Re Missing Motor-Operated Valve T-Drains (← links)
- 05000499/LER-2005-004, Re Essential Cooling Water Inoperable Longer than Allowed Outage Time (← links)
- 05000499/LER-2005-003, Regarding Inoperable Cold Overpressure Mitigation System (← links)
- 05000499/LER-2005-002, Regarding Essential Chiller 22C Inoperable Longer than Allowed by Technical Specifications (← links)
- 05000499/LER-2005-001, Regarding Shutdown of STP Unit 2 Due to Reactor Coolant System Pressure Boundary Leak (← links)
- 05000499/LER-2003-003, Regarding Standby Diesel Generator 22 Failure (← links)
- 05000499/LER-2003-004, Regarding Standby Diesel Generator 22 Failure (← links)
- 05000499/LER-2002-004-01, Turbine Blade Failure (← links)
- 05000499/LER-2003-002, Regarding Safety Injection Actuation (← links)
- 05000499/LER-2003-001, For South Texas Unit 2 Regarding, Inoperable Residual Heat Removal Train (← links)
- 05000499/LER-2002-003, Automatic Reactor Trip Due to Main Turbine Trip Caused by High Water Level in 2B Steam Generator (← links)
- 05000499/LER-2002-002, Re Unit 2 Manual Reactor Trip Due to Unexpected Closure of Feedwater Isolation Valve from South Texas Unit 2 (← links)
- 05000499/LER-2002-001, Gaseous Waste Processing System Oxygen Monitor Automatic Trip Inoperable on 01/17/2001 (← links)
- 05000499/LER-1995-005-01, :on 950412,experienced Inadvertent ESF Actuation of CCW Pump Due to Essential Cooling Water Sys Pressure Switch Being Isolated & Depressurized.Verified Position of Essential CW Isolation Valves (← links)
- 05000499/LER-2024-002-01, Two Control Room Envelope HVAC Trains Inoperable Resulting in a Condition That Could Have Prevented Fulfillment of a Safety Function (← links)
- ML101830257 (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)
- 05000499/LER-1995-002, :on 950131,pressurizer Level Channel LT-0467 Was Considered Inoperable Due to Use of Incorrect Calibr Correction Factor.Provided up-to-date Controlled Scaling Document for Affected Pressurizer Level Transmitter (← 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)
- 05000499/LER-2010-005-02, Regarding Startup Feed Pump 24 Breaker Failure and Unit 2 Reactor Trip (← links)
- 05000499/LER-2010-005-01, For South Texas Project Unit 2, Regarding Startup Feed Pump 24 Breaker Failure and Unit 2 Reactor Trip (← links)
- 05000499/LER-2010-006, Regarding Technical Specifications Not Met for Reactor Coolant System Unidentified Leakage (← links)
- 05000499/LER-2010-005, Regarding Startup Feed Pump 24 Breaker Failure and Unit 2 Reactor Trip (← links)
- 05000499/LER-2010-004, Loss of the Train a Essential Cooling Water (Ecw) System Due to a Loss of the Ecw Intake Structure Ventilation Fan 21A (← links)
- 05000498/LER-2010-003, Regarding Unit 1 Reactor Trip During Surveillance Testing (← links)
- 05000499/LER-2010-003, Regarding Containment Purge in Operation When Not Permitted by Technical Specifications (← links)
- 05000499/LER-2010-001-01 (redirect page) (← links)
- 05000498/LER-2010-001, Unit Shutdown Required by Technical Specifications (← links)
- 05000499/LER-2010-002, Regarding Unanalyzed Condition Regarding the Fire Protection System (← links)