Pages that link to "05000400/LER-2024-001, Automatic Reactor Trip Due to Main Generator Lock-Out"

The following pages link to 05000400/LER-2024-001, Automatic Reactor Trip Due to Main Generator Lock-Out:

Displayed 23 items.

• 10 CFR 50.73(a)(2)(iv)(A), System Actuation ‎ (← links)
• ML18180A418 ‎ (← links)
• ML14318A929 ‎ (← links)
• ML101410264 ‎ (← links)
• ML092740231 ‎ (← links)
• ML021440583 ‎ (← links)
• ML021360454 ‎ (← links)
• ML021300264 ‎ (← links)
• ML20079L270 ‎ (← links)
• ML021010282 ‎ (← links)
• ML020780348 ‎ (← links)
• ML020730745 ‎ (← links)
• IR 05000400/2002001 ‎ (← links)
• ML020510187 ‎ (← links)
• ML020430290 ‎ (← links)
• ML020150182 ‎ (← links)
• IR 05000400/2020402 ‎ (← links)
• ML20142A185 ‎ (← links)
• ML20217L127 ‎ (← links)
• RA-24-0183, Automatic Reactor Trip Due to Main Generator Lock-Out (redirect page) ‎ (← links)
  • RA-24-0183 (redirect page) ‎ (← links)
    • 05000400/LER-2024-001, Automatic Reactor Trip Due to Main Generator Lock-Out ‎ (← links)
• ML24204A192 (redirect page) ‎ (← links)
  • IR 05000400/2024004 ‎ (← links)
• 05000400/LER-2024-001-01, Automatic Reactor Trip Due to Main Generator Lock-Out ‎ (← links)
• 05000400/LER-2024-001 (redirect page) ‎ (← links)
  • 05000400/LER-2007-004 ‎ (← links)
  • 05000400/LER-2001-003 ‎ (← links)
  • 05000400/LER-2001-001 ‎ (← links)
  • 05000400/LER-1986-004, Forwards LER 86-004-00.LER 86-003-00 Will Not Be Issued,As Event Does Not Require LER ‎ (← links)
  • 05000400/LER-2024-001-01, Automatic Reactor Trip Due to Main Generator Lock-Out ‎ (← links)
  • 05000400/LER-2024-001, Automatic Reactor Trip Due to Main Generator Lock-Out ‎ (← links)
  • 05000400/LER-2022-006-02, Auxiliary Feedwater Pump Inoperability ‎ (← links)
  • 05000400/LER-2022-007-01, Automatic Reactor Trip Due to Loss of Power from the a Auxiliary Bus ‎ (← links)
  • 05000400/LER-2022-006, Auxiliary Feedwater Pump Inoperability ‎ (← links)
  • 05000400/LER-2022-007, Automatic Reactor Trip Due to Loss of Power from the ‘A’ Auxiliary Bus ‎ (← links)
  • 05000400/LER-2022-008, Automatic Actuation of Auxiliary Feedwater System ‎ (← links)
  • 05000400/LER-2022-005-01, Manual Reactor Trip Due to B Condensate Pump Motor Failure ‎ (← links)
  • 05000400/LER-2022-005, Manual Reactor Trip Due to B Condensate Pump Motor Failure ‎ (← links)
  • 05000400/LER-2022-004, Both Trains of High Head Safety Injection Inoperable ‎ (← links)
  • 05000400/LER-2022-003, Manual Reactor Trip Due to Degrading Condenser Vacuum ‎ (← links)
  • 05000400/LER-2022-001, Essential Services Chilled Water Chiller Inoperable Due to Pre-Rotation Vane Actuator Control Arm Position ‎ (← links)
  • 05000400/LER-2021-005, Past Inoperability of Effluent Accident Monitor Exceeded Time Allowed by Technical Specifications ‎ (← links)
  • 05000400/LER-2021-004, Pressurizer Safety Valve Lift Setpoint Drifted Outside of Technical Specification Tolerance ‎ (← links)
  • 05000400/LER-2021-002-01, Re All ECCS Accumulator Isolation Valves Closed in Mode 3 with RCS Pressure Greater than 1000 Psig ‎ (← links)
  • 05000400/LER-2021-001, Automatic Reactor Trip Due to Faults on Non-Segregated Bus from Unit Auxiliary Transformer 1B ‎ (← links)
  • 05000400/LER-2021-002, All ECCS Accumulator Isolation Valves Closed in Mode 3 with RCS Pressure Greater than 1000 Psig ‎ (← links)
  • 05000400/LER-2020-002, Re Manual Reactor Trip Due to Control Rod Drop During Surveillance Testing ‎ (← links)
  • 05000400/LER-1986-005-03, :on 861108,during Maint Outage,Power Removed from Power Panels Supplying Portable Samplers on Waste Process Bldg.Caused by Personnel Error.Caution Tags Placed on Panels to Ensure That Power Not Interrupted ‎ (← links)
  • 05000400/LER-1986-004-03, :on 861107,safety Injection Signal Occurred During Mod Work to safety-related Inverters.Caused by Operator Failure to Recognize That de-energizing Process Cabinets Would Set Off Signal.Safety Injection Reset ‎ (← links)
  • 05000400/LER-1986-002-03, :on 861102,safety Injection Actuation Signal Initiated During Technician Troubleshooting on Steam Line Isolation in Train B.Caused by Failure to Follow Restoration Procedure.Equipment Restored.W/Undated Ltr ‎ (← links)
  • 05000400/LER-1986-001-03, :on 861030,turbine Bldg Stack Monitor RM-1TV-3536-1 Declared Inoperable.Caused by Personnel Failure to Complete Surveillance Testing.Personnel Instructed on Responsibilities.W/Undated Ltr ‎ (← links)
  • 05000400/LER-1986-009, :on 861211,while Performing Surveillance Test Procedure,Unanticipated Train B Safety Injection Signal Actuated & Second Actuation Occurred.Caused by Procedural Inadequacy & Personnel Error.Procedure Revised ‎ (← links)
  • 05000400/LER-1987-006, :on 870123,charging/safety Injection Pumps 1B-SB & 1C-SAB Declared Inoperable Due to Failed Attempts to Automatically Start Train 1B-SB Chiller.Caused by Chiller Tripping on Overload.Plant Cooldown Initiated ‎ (← links)
  • 05000400/LER-1987-005, :on 870122,reactor Tripped Due to lo-lo Level in Steam Generator A.Caused by Trip of Condensate Pump a & Inability to Restore Feedwater Flow.Control Valve Repaired. Cause of Pump Failure Will Be Determined ‎ (← links)
  • 05000400/LER-1987-004, :on 870121,reactor Tripped While Power Level Reduced Due to intermediate-range Channel N-36 Remaining in Trip Condition.Caused by Reset Value Set Too Low.Setpoints Adjusted to Values Based on Data Collected ‎ (← links)
  • 05000400/LER-1987-003, :on 870113,cooldown Initiated Due to Inoperable motor-driven 1A-SA Auxiliary Feedwater Pump.Caused by Assembly Error During Initial Installation of Pump.Flow Test Frequency Changed & Pump Repaired ‎ (← links)
  • 05000400/LER-1987-001, :on 870111,alarm Received Indicating That Data B Inputs Failed on Rod Withdrawn from Core.Caused by Mfg Deficiency Leading to Unreliable Rod Position Info.Reactor Trip Breakers Opened ‎ (← links)
  • 05000400/LER-1987-002, :on 870102,discovered That Testing of Reactor Protection Sys Logic,Reactor Trip Breaker & Bypass Breaker Not Staggered Properly Per Tech Spec Table 4.3-1.Caused by Personnel Error.Tests Staggered ‎ (← links)
  • 05000400/LER-1986-010-03, :on 861218,effluent Gas Grab Sample from Turbine Bldg Vent Stack Radiation Monitor RM-1TV-3536-1 Missed.Caused by Technician Involvement in Other Activities. Sample Taken.Personnel Counseled ‎ (← links)
  • 05000400/LER-1986-009-03, :on 861212,unanticipated Safety Injection Train B Signal Actuated During Performance of Surveillance Test Procedure,Followed by Inadvertent Manual Actuation.Caused by Procedural Deficiency & Personnel Error ‎ (← links)
  • 05000400/LER-1986-008-03, :on 861206,digital Rod Position Indication Sys Not Operable During Power Ascension Test.Caused by Failure to Review Procedure Against Requirements of Tech Spec Special Test Exception 3.10.5 ‎ (← links)
  • 05000400/LER-1986-007-04, :on 861204,fire Hose Station Taken Out of Svc W/O Appropriate Compensatory Action.Caused by Personnel Error.Backup Suppression Established Immediately Following Discovery ‎ (← links)
  • 05000400/LER-1987-008, :on 870227,loss of Main Feedwater & Automatic Start of Both motor-driven Auxiliary Feedwater Pumps Occurred.Caused by Transient in Turbine Load.Motor Replaced & Tested & Valve Returned to Svc ‎ (← links)
  • 05000400/LER-1987-010, :on 870228,air Supply Fans Automatically Initiated Control Room Isolation Signal & Tripped Normal Supply Fans.Caused by Faulty Detector.Fire Detector Cleaned & Replaced & Ventilation Sys Restored ‎ (← links)
  • 05000400/LER-1987-009, :on 870224 & 25,containment Leak Detection Radiation Monitor Noble Gas Channel Declared Inoperable. Caused by Procedural Deficiency.Advance Change 1/2, Correcting Deficiency,Approved ‎ (← links)
  • 05000400/LER-2020-001-01, Automatic Reactor Trip During Turbine Control System Digital Electro-Hydraulic System Maintenance ‎ (← links)
  • 05000400/LER-1988-010-01, :on 880425,containment Purge Valves Not Closed as Required While Containment Leak Detection Radiation Declared Inoperable for Sampling.Caused by Personnel Error. Sampling Procedures Will Be Revised ‎ (← links)
  • 05000400/LER-2020-001, Automatic Reactor Trip During Turbine Control System Digital Electro-Hydraulic System Maintenance ‎ (← links)
  • 05000400/LER-1996-002, :on 960117,failure to Perform Required Surveillance Testing During Planned Maint Outage in Oct 1994 Identified.Caused by Personnel Error.Personnel Involved in Procedure Counseled ‎ (← links)
  • 05000400/LER-1990-020, :on 900913,Tech Spec Violation Occurred Due to Missed Radwaste Sampling Requirements ‎ (← links)
  • 05000400/LER-2019-003, Both Source Range Nuclear Instruments Inoperable ‎ (← links)
  • 05000400/LER-2019-002, B Train Chiller for the Essential Services Chilled Water System Tripped on High Compressor Oil Temperature ‎ (← links)
  • 05000400/LER-2019-001-01, Turbine Control System Auto-Stop Trip Solenoid Operated Valves Response Times Impacted ‎ (← links)
  • 05000400/LER-2019-001, Turbine Control System Auto-Stop Trip Solenoid Operated Valves Response Times Impacted ‎ (← links)
  • 05000400/LER-2018-004, Independent Trains of the Emergency Core Cooling System Inoperable During Testing ‎ (← links)
  • 05000400/LER-2018-003, Turbine Control System Auto-Stop Trip Solenoid Operated Valves Response Times Impacted ‎ (← links)
  • 05000400/LER-2018-002, Reactor Pressure Vessel Closure Head Penetration Nozzle Indications Attributed to Primary Water Stress Corrosion Cracking ‎ (← links)
  • 05000400/LER-2018-001, Automatic Actuation of Auxiliary Feedwater System ‎ (← links)
  • 05000400/LER-1995-015-01, :on 951213,mod Made to Circuitry for Motor Drive Afps Flow Control Valves.Caused by Cognitive Personnel Error.Procedures Revised ‎ (← links)
  • 05000400/LER-1998-005, :on 980420,TS Verbatim non-compliance Was Determined.Caused by Misinterpretation of TS Requirements. Issued Memo to Reemphasize Need to Comply W/Literal Meaning of TS Requirements in Verbatim Manner ‎ (← links)
  • 05000400/LER-1996-001, Ack That Corrective Actions as Implemented W/Regard to Item Deviates from Ones Which Were Described in NOV Response & Stated in LER 96-001-00 ‎ (← links)
  • 05000400/LER-1997-014, :on 970514,SI Occurred During Ssps Surveillance Testing.Caused by Inattention to Detail During Recent Rev to Surveillance Test Procedure Being Used.Revised Deficient Surveillance Procedures ‎ (← links)
  • 05000400/LER-1997-006, :on 970318,breach Was Identified in Thermo-Lag Fire Barrier Wall Due to Inadequate Initial Design,Poor Construction Methods & Incomplete as-built Design.Visual Insp of Thermo-Lag Barrier Walls Performed ‎ (← links)
  • 05000400/LER-1996-012, :on 960724,SIII Inverter Was Taken OOS for Repair.Caused by Faulty ferro-resonant Transformer within Inverters Internal Circuitry.Repairs & Load Testing for Siii Were Completed ‎ (← links)
  • 05000400/LER-1995-008-01, :on 950902,charging/SI Pump B (Csip) Returned to Svc Prior to Required Acceptance Testing.Caused by Personnel Error.Csip a Placed in Svc on 950902 & Csip B Declared Inoperable ‎ (← links)
  • 05000400/LER-1995-007-01, :on 950901,inadvertent Start of Turbine Driven AFW Pump/Unplanned ESF Actuation Occurred Due to Inadequate Test Procedures.Revised Appropriate Procedures ‎ (← links)
  • 05000400/LER-1995-005-02, :on 950731,TS Violation Occurred Due to Missed Compensatory Vent Stack Flow Rate Estimate.Counseled Individual Involved & Training for Appropriate Operations Personnel Will Be Performed ‎ (← links)
  • 05000400/LER-1990-011-01, :on 900405,tech Spec Violation Occurred Due to Missed Leakage Tests on Valve.Caused by Procedural Deficiency.Appropriate Procedure Revised & Personnel Trained ‎ (← links)
  • 05000400/LER-1991-008, :on 910403,common Causes Failure of High Head Safety Injection Alternate Miniflow Occurred.Caused by Water Hammer Due to Air Void.Supports Added to Test Connection Lines ‎ (← links)
  • 05000400/LER-1989-019-02, :on 891220,attempt to Start Main Feedwater Pump Unsuccessful & Automatic Start Signal Generated for motor- Driven Auxiliary Feedwater Pumps.Caused by Out of Calibr Pressure Switch.Pressure Switch Recalibr ‎ (← links)
  • 05000400/LER-1989-022-01, :on 891210,loss of Operating RHR Train Occurred.Caused by Spurious Closure of Suction Valve During Testing of Interlocks.Procedure Revised to Ensure Breakers for Operating RHR Loop Open During Testing ‎ (← links)
  • 05000400/LER-1989-007-01, :on 890302,containment Leak Detection Radiation Monitor Generated High Radiation Alarm Causing Containment Ventilation Isolation (CVI) Signal & Closure of CVI Valves. Caused by Personnel Error.Personnel Counseled ‎ (← links)
  • 05000400/LER-1988-035-01, :on 881221,emergency Diesel Generator Actuation Occurred Due to 1A-SA Emergency Bus Tripping.Caused by Failed Relays.Two Faulty Relays Replaced & Bench Tested.W/ ‎ (← links)
  • 05000400/LER-1988-016, :on 880620,Tech Specs Violated Due to All RCS Leakage Detection Sys Inoperable.Cause Attributed to Lack of Procedural Guidance.Written Instructions Will Be Developed. Leaking Valve Will Be Repaired ‎ (← links)
  • 05000400/LER-1988-015-02, :on 880614,vent Stack Sample Not Obtained While Radiation Monitor Inoperable.Caused by Technician Involved W/Boron Sampling in Chemical & Vol Control Sys.Importance of Compensatory Sampling Stressed ‎ (← links)
  • 05000400/LER-1988-013-02, :on 880603,emergency Bus 1A-SA Deenergized Resulting in Automatic Start of Emergency Diesel Generator 1A-SA.Cause Undetermined.Failure of Battery Room Ventilation Damper Traced to Sticking Limit Switch ‎ (← links)
  • 05000400/LER-1988-014, :on 880520,discovered Two RCS Wide Range Pressure Inputs for Subcooling Margin Monitor Calculations Had Been Changed.Caused by Inadequate Procedure Controls. Procedures Revised ‎ (← links)
  • 05000400/LER-1987-066, :on 871204,frequency Requirement for Containment Ventilation Isolation Circuitry Actuation Logic Test Not Fulfilled.Caused by Personnel Error.Procedure & Task Sheet for Monthly Tests Generated ‎ (← links)
  • 05000400/LER-1987-049, :on 870925,operating Main Feedwater Pump Tripped on Low Flow.Caused by High Vibration in Recirculation Piping.Valve Stem Replaced & Recirculation Valve Returned to Svc on 870925 ‎ (← links)
  • 05000400/LER-1987-051, :on 870831,main Feedwater Pump a Tripped Due to Feedwater Oscillation.Caused by Feedwater Sys Design Problems.Valve Stem Repaired & Feedwater Sys Changes to Improve Reliability Under Evaluation ‎ (← links)
  • 05000400/LER-1987-044, :on 870713,Tech Spec Surveillance for Axial Flux Difference Missed.Caused by Personnel Error.Operator Counseled.Repairs in Progress to Repair Automatic Axial Flux Difference Monitor ‎ (← links)
  • 05000400/LER-1987-042, :on 870709,wrong Fuses Pulled During Process of Placing Clearance OP-87-1290 Resulting in Automatic Reactor/ Turbine Trip.Caused by Personnel Error.Operator Training Conducted Re Fuse Labeling Conventions ‎ (← links)
  • 05000400/LER-1987-029, :on 870428,engineer Determined That Snubber Found Damaged on 870422 Per Required Action of Tech Spec. Snubber Damaged Due to Water Hammer Occurring When Valve Isolated.Snubber Replaced ‎ (← links)
  • 05000400/LER-1987-020, :on 870413,reactor Trip Setpoints on All Three Overtemp Delta Temp (Odt) Bistables Incorrectly Set.Caused by Apparent Design Oversight in Odt Circuit Design & Vendor Testing Methodology.Test Procedures Revised ‎ (← links)
  • 05000400/LER-1987-022, :on 870402,Tech Spec 3.3.3.10 Discovered Violated Due to Flow Estimates Taken at Beginning & End of Radioactive Releases on 870327,28 & 0401 Instead of Every 4 H.Caused by Inoperable Flow Rate Instrument ‎ (← links)
  • 05000400/LER-1987-019, :on 870412,manual Plant Trip Initiated Due to Loss of Feedwater Trains & Decreasing Steam Generator Levels.Caused by Condensate Pump High Temp Trip.Pressure & Steam Generator Levels Restored ‎ (← links)
  • 05000400/LER-1987-021, :on 870414,circulating Water Sys Flow to Main Condenser Restricted,Resulting in High Condensate Temps,Trip of Both Feedwater Trains & Manual Trip of Turbine & Reactor. Caused by Debris on Pump Suction Screens ‎ (← links)
  • 05000400/LER-1987-018, :on 870403,manual Reactor Trip Initiated Due to Loss of Both Main Feedwater Pumps.Caused by Inadvertent Short of Test Leads in Process Instrumentation Cabinet & Incorrect Setpoint.Undocumented Leads Removed ‎ (← links)
  • 05000400/LER-1999-008-01, :on 991008,CR Emergency Filtration Sys Tech Specs Occurred.Caused by Site Personnel Failed to Recognize That Blocking Open CR Emergency Filtration Sys.Procedures Revised.With ‎ (← links)
  • 05000400/LER-1999-007-02, :on 990811,determined That Cvis ARMs High Alarm Setpoints Were Not within TS Limit.Caused by Not Having Procedure to Verify If Cvis ARM High Alarm Setpoints Were within TS Requirements.Revised Procedures.With ‎ (← links)
  • 05000400/LER-1999-006, :on 981124,noted Failure to Comply with TS 4.0.4 & TS 3/4.6.3, Civs. Caused by post-maint Testing That Did Not Adequately Test Control Circuitry & Verify Isolation Time Following Maint.Procedure Was Revised ‎ (← links)
  • 05000400/LER-1999-006-01, Forwards LER 99-006-01 Describing Condition Which Resulted in Exceeding TS Requirements for CIVs & TS 4.0.4 for Generic Requirements for Surveillance Testing.Rev Includes Results of Investigation Into Failure to Recognize TS ‎ (← links)
  • 05000400/LER-1999-005, :on 990313,plant Exceeded ESFAS TS 3.3.2,Action 21.Caused by Inadequate Procedure Rev Preparation.Licensee Revised Applicable Maint Surveillance Test Procedure (MST-10072) to Identify TS Required Actions.With ‎ (← links)
  • 05000400/LER-1999-004, :on 990312,unit Trip Was Noted.Caused by Degraded Condition of SG Water Level Flow Control Valve. Replaced Positioners on All Three FW Regulating Valves.With ‎ (← links)
  • 05000400/LER-1999-003, :on 990123,noted That Plant Was Outside Design Basis Due to Isolation of Fire Protection Containment Sprinkler Sys.Caused by Human Error.Restored Containment Sprinkler Sys to Operable Status.With ‎ (← links)
  • 05000400/LER-1999-002, :on 990114,RT Due to Not Removing Temporary Device from Relay Following Calibration Was Noted.Caused by Human Error.Counseled Personnel Involved in Event.With ‎ (← links)
  • 05000400/LER-1999-001, :on 990106,SF Pool Water Level Was Not Maintained Greater than 23 Feet Above Stored BWR Fuel Assemblies.Caused by Fasteners Bending Under Specific Circumstances.Increased Water Level.With ‎ (← links)
  • 05000400/LER-1998-004, :on 980313,identified Design Deficiency Re Potential Runout of Tdafwp.Caused by Inadequate Original AFW Sys Design.Operability Evaluation Was Completed on 980313 & Addl Engineering Analysis Was Performed by Vendor ‎ (← links)
  • 05000400/LER-1998-004-01, Forwards LER 98-004-01 Re Design Deficiency Concerning Potential Runout Condition Occurring with Tbafp During Certain Accident Scenarios.Rev Includes Results of Subsequent Testing by Vendor ‎ (← links)
  • 05000400/LER-1998-007, :on 981023,turbine Control Anomaly Caused Manual Rt.Caused by Failure to Incorporate Verbal Vendor Guidance in Operating Procedures.Addl Vendor Guidance Will Be Verified & Added to Procedures.With ‎ (← links)
  • 05000400/LER-1997-002, :on 970207,determined That Cold Weather Conditions Resulted in Mfiv Being Potentially Inoperable During Period 970117-20.Caused by Inadequate Design of HVAC Sys.Implemented Mods to Steam Tunnel HVAC Sys ‎ (← links)
  • 05000400/LER-1997-002-01, Fowards LER 97-002-01,IAW 10CFR50.73.Rev Provides Addl Corrective Actions Taken to Address Low Temps in Area of Mfiv ‎ (← links)
  • 05000400/LER-1997-021, :on 980210,discovered That SFP Water Level Had Not Been Verified Greater than 23 Feet Above BWR Fuel Assemblies.Caused by Misinterpretation of TS Requirements. Will Submit TS Change Request to Revise TS 3.9.1.11 ‎ (← links)
  • 05000400/LER-1997-021-03, Forwards LER 97-021-03,per 10CFR50.73.Rev Provided New Scheduled Completion Date of 980901 for TS Change Request Described in Planned Correction Action Number 1 ‎ (← links)
  • 05000400/LER-1998-006, :on 980508,failure to Perform Insp & Preventive Maint on MCCB as Required by TS Was Noted.Caused by Inadequate Sps.Tested 9 Pressurizer Heater Bank Breakers by Cycling Each ‎ (← links)
  • 05000400/LER-1998-002, :on 980121,determined Ssps (P-11 Permissive) Testing Deficiency.Caused by Inadequate Review of Initial Ts.Will Revise & Perform Surveillance Test Procedures to Verify Operability of P-11 Permissive ‎ (← links)
  • 05000400/LER-1998-002-01, Forwards LER 98-002-01,per 10CFR50.73.Revised LER Describes Change in Planned Corrective Actions for Ssps Testing Deficiency ‎ (← links)
  • 05000400/LER-1997-021-02, Forwards LER 97-021-02,describing Addl Condition Identified During on-going TS Surveillance Procedure Review Project.Rev Includes Update to CAs ‎ (← links)
  • 05000400/LER-1998-003, :on 980129,failure to Perform Shutdown Margin Calculation Required by TS Surveillance Requirements Occurred.Caused by Ambiguity in TS 3.1.3.1.c.Procedures Revised ‎ (← links)
  • 05000400/LER-1998-001, :on 980109,potential Condition Outside Design Basis Related to Instrument Air Sys Leak Causing SG pre- Heater Bypass Isolation Valves to Be Inoperable Was Noted. Caused by Inadequate Design Control.Generated Jco 98-01 ‎ (← links)
  • 05000400/LER-1997-024, :on 971118,SSPS Testing Deficiency Was Noted. Caused by Inadequate Testing Scheme Provided by Ssps Vendor. Revised Procedure ‎ (← links)
  • 05000400/LER-1997-023, :on 920721,RCS PIV Testing Deficiency Was Noted.Caused by Failure to Consider All Testing Variables During Initial Sp Development.Surveillance Tp OST-1506 Was Revised to Incorporate Correction Factor ‎ (← links)
  • 05000400/LER-1997-021-01, Forwards LER 97-021-01,IAW 10CFR50.73.Rev Describes Two Addl Conditions Identified During on-going TS Surveillance Procedure Review Project ‎ (← links)
  • 05000400/LER-1996-008, :on 960425,turbine Trip/Reactor Trip Occurred. Caused by High Resistance Connection Resulting from a Phase Switch Jaw & Blade Contacts.Failed a Phase Disconnect Switch on Breaker 52-7 Replaced ‎ (← links)
  • 05000400/LER-1996-008-02, Forwards LER 96-008-02 Re Reactor Trip Due to Failure of Switchyard Breaker Disconnect Switch.Rev Repts Addl Info Pertaining to Problems Encountered W/Normal Svc Water Sys Following 960425 Reactor Trip ‎ (← links)
  • 05000400/LER-1997-016, :on 970608,reactor Trip Occurred,Due to Personnel Error While Attempting to Adjust Power Range Nuclear Instrumentation Channel Following Performance of Calorimetric.Procedures Revised ‎ (← links)
  • 05000400/LER-1997-022, :on 970829,TS Required Shutdown Due to Expiration of AFW Lco.Caused by Personnel Error.Completed Repairs TDAFW Pump & Returned Plant to Svc on 970831 ‎ (← links)
  • 05000400/LER-1997-020, :on 970814,inadequate Fire Protection Provided for safety-related EDG Fuel Oil Transfer Pump Cables Resulted in Operation Outside Design Basis.Caused by Engineering Oversight.Established Fire Watches ‎ (← links)
  • 05000400/LER-1997-019, :on 970720,turbine Trip/Reactor Trip Occurred. Caused by Three Phase Fault That Collapsed Excitation Field in Main Generator,Resulting in Generator Lockout.Exciter Rotor Assembly Was Replaced ‎ (← links)
  • 05000400/LER-1996-018, :on 960903,manual Reactor Trip Occurred Due to Loss of Normal Sw.Caused by Mechanical Failure of B Water Pump & a Normal SW to Remain Running Once Manually Started.Restored a Normal SW Pump to Svc ‎ (← links)
  • 05000400/LER-1996-018-01, Forwards LER 96-018-01 Per 10CFR50.73.Rev Provides Addl Info Related to Cause of a Normal Svc Water Pump Trip That Occurred on 960903,following Loss of Running Normal Svc Water Pump ‎ (← links)
  • 05000400/LER-1996-013, :on 961028,condition Outside of Design Basis Where RWST Had Been Aligned w/non-seismically Qualified Sys Was Identified.Caused by Failure to Reconcile Operating Procedure Lineups.Established Administrative Controls ‎ (← links)
  • 05000400/LER-1996-013-02, Forwards LER 96-013-02 Per 10CFR50.73.Rev Reports Results of Addl Analysis That Was Performed to Determine Safety Consequences Associated W/Potential Loss of Ccws ‎ (← links)
  • 05000400/LER-1997-018, :on 970701,determined That Plant Procedures Had Not Received Proper Reviews & Approvals.Caused by Failure to Comply W/Plant Administrative Procedure AP-006.Counseled Involved Individuals ‎ (← links)
  • 05000400/LER-1997-017, :on 970612,failed to Recognize Inoperable Reactor Afd Monitor.Caused by Personnel Error.Operators Involved in Event Will Be Counseled Prior to Assuming Shift Duties ‎ (← links)
  • 05000400/LER-1997-015, :on 970602,inadequate Auxiliary Feedwater Sys Flow Control Valve Surveillance Testing Deficiency Was Identified.Caused by Failure to Recognize Impact on TS 4.7.1.2.1.Readjusted AFW FCV Actuator Spring ‎ (← links)
  • 05000400/LER-1997-013, :on 970508,entry Into Mode-6 Without Operable Components,Resulting in TS 3.0.4 Violation Occurred.Caused by Personnel Error.Personnel Involved Counseled ‎ (← links)
  • 05000400/LER-1997-012, :on 970505,determined That Previous Auxiliary Control Panel Had Not Verified Operability of Interposing Relays.Caused by Misinterpretation of Tss.Reviewed Other Remote Shutdown Panel Transfer Circuitry ‎ (← links)
  • 05000400/LER-1996-023, :on 961114,design Deficiency in EDG Protection Circuitry Was Identified.Caused by Inadequate Original Plant Design.Surveillance Test Procedures OST-1013 & OST-1073 Revised ‎ (← links)
  • 05000400/LER-1997-005, Responds to NRC Re Violations Noted in Insp Rept 50-400/97-03.Corrective Actions:Submitted LER 97-005-00 on 970317 & Reviewed Violation W/Individuals Involved to Ensure Understanding Re Identification of Reportable Conditions ‎ (← links)
  • 05000400/LER-1997-011, :on 970422,inappropriate TS Interpretation Resulted in Violations of ECCS Accumulator TS & Entry Into TS 3.0.3.Caused by Procedural Inadequacy.Tsi 88-001 Cancelled 970508 & Procedures Revised ‎ (← links)
  • 05000400/LER-1997-010, :on 970418,design Deficiency Determined Re Reactor Coolant Pump Motor Oil Collection Sys.Caused by RCP Ocs Design Detail.Rcp Ocs Enclosures for Each of Three Installed RCP Motors Have Been Modified ‎ (← links)
  • 05000400/LER-1997-009, :on 970407,fuse Was Removed from CR Ventilation Isolation Signal Power Supply Circuitry Due to Personnel Error.Individuals Involved Were Counseled ‎ (← links)
  • 05000400/LER-1997-008, :on 970404,safety-related AHU Not Declared Inoperable During Maintenance on Associated Temperature Switches Resulting in Violation of Ts.Caused by Incorrect Interpretation.Operations Night Order Issued ‎ (← links)
  • 05000400/LER-1997-007, :on 970325,inoperable CCW Sys TS 3.0.3 Entry Made.Caused by Combination of Procedural Inadequacies, Improper Use of Procedure Guidance & Poor Communication. Applicable Individuals Counseled ‎ (← links)
  • 05000400/LER-1997-004, :on 970304,in-plant Spent Fuel Cask Handling Activities Conducted Outside Design Basis.Caused by Lack of Understanding of Requirements.Operations Placed on Hold Pending NRC Review & Approval of Procedures ‎ (← links)
  • 05000400/LER-1997-003-01, :on 970227,steam Generator Low Level Protection Circuitry Outside Design Basis Occurred.Caused by Inadequate Failure Modes & Effects Analysis Performed as-built Piping Configuration for S/G Level.Review Performed ‎ (← links)
  • 05000400/LER-1996-020, :on 960906,inadvertent RWST Boron Dilution Event Occurred.Caused by Personnel Error.Operating Procedure Was Revised to Reflect locked-closed Designation for RWST Fill Valve 1DW-5 ‎ (← links)
  • 05000400/LER-1997-001-01, :on 970131,automatic Reactor Tripped Resulting from SG low-low Level.Caused by Inadvertent Closure of Mfiv (1FW-159) & Faulty Hydraulic Relays.Shuttle Valves Replaced, SG Level Discrepancy Investigated ‎ (← links)
  • 05000400/LER-1996-025, :on 961218,determined Missed Surveillance Test on PORV Block Valve 1RC-115.Caused by Personnel Error.Tested 1RC-115 & Counseled Personnel Involve ‎ (← links)
  • 05000400/LER-1996-022, :on 961122,wiring Discrepancy Was Found in Auxiliary Building Ventilation Sys Circuitry.Caused by Personnel Error.Training on This Event Will Also Be Performed for Appropriate Maintenance ‎ (← links)
  • 05000400/LER-1996-024, :on 961121,identified Common Mode Failure in RAB Electrical Equipment Protection Rooms Ventilation Sys. Caused by Inadequate Initial Sys Design.Will Install Plant Mod to Resolve AH-16 Single Failure ‎ (← links)
  • 05000400/LER-1996-021, :on 961107,inadequate post-maint Testing Following Repairs on Containment Isolation Valve 1SP-208 Identified.Caused by Misinterpretation of ASME Code. Procedures Revised ‎ (← links)
  • 05000400/LER-1996-017, :on 960805,failure to Perform Surveillance Testing Required by TS Noted.Caused by Personnel Error. Surveillance Testing Scheduling Process Has Been Developed & Implemented on Trial Basis ‎ (← links)
  • 05000400/LER-1996-019, :on 960906,downed Power Lines & Trees Blocked Plant Access Roads Hampering Site Personnel from Accessing Plant.Caused by Passage of Hurricane Fran.Plant Roads Were Cleared on 960906 & Plant Restarted ‎ (← links)
  • 05000400/LER-1996-010-02, :on 960628,identified Surveillance Testing Deficiencies That Caused Past Entries Into TS 3.0.3.Caused by Personnel Error.Surveillance Test Procedures OST-1008 & OST-1092 Revised ‎ (← links)
  • 05000400/LER-1996-016, :on 960814,reactor Trip Bypass Breaker Surveillance Test,Required by TSs Not Performed.Caused by Inadequate Procedures Not Ensuring Testing Done Prior to Placing Them in Svc.Procedures Revised ‎ (← links)
  • 05000400/LER-1996-015, :on 960812,partial ESF Actuation of Main Steam Isolation Signal Occurred During Surveillance Testing Due to Operator Error.Sta Counseled ‎ (← links)
  • 05000400/LER-1996-014, :on 891127,identified Condition of Two Charging/Safety Injection Pumps Connected to Same Emergency Electrical Bus.Caused by Failure to Follow Operating Procedures.Racked Out 6.9 Kv Breaker ‎ (← links)
  • 05000400/LER-1996-011, :on 960629,failed to Perform Surveillance of Containment Isolation Valves.Caused by Incorrect Interpretation of TS Surveillance Requirements.Issued Operations Re TS 4.6.1.1 ‎ (← links)
  • 05000400/LER-1996-010, :on 960628,surveillance Test Deficiencies Identified in Quarterly RHR Sys.Caused by Inadequate Test Procedures Resulting from Personnel Errors.Scheduled Tests on Administrative Hold & Procedures Revised ‎ (← links)
  • 05000400/LER-1996-009, :on 960530,identified Deficiencies in Reactor Auxiliary Bldg Exhaust Sys.Caused by Inadequate Surveillance Test Procedures.Revised Test Procedure ‎ (← links)
  • 05000400/LER-1996-002-04, :on 960508,failed to Properly Perform Tech Spec Surveillance Testing.Caused by Personnel Error.Personnel Counseled,Procedure Revised & Continued in-program Tech Spec Testing Program Review ‎ (← links)
  • 05000400/LER-1996-007, :on 960425,failed to Perform Tech Spec Surveillance Testing Per Specification 4.7.6.d.3.Caused by Inadequate Procedure Development.Satisfied Differential Pressure Testing Requirement ‎ (← links)
  • 05000400/LER-1996-006, :on 960325,separation of Valve Stem & Disk for Main FW Isolation Valve Caused Valve to Become Inoperable. Caused by Mfg Defect.Valve Stem Machined & Procedures Revised ‎ (← links)
  • 05000400/LER-1996-005-01, :on 960312,failure to Properly Test Containment Bldg Outer Personnel Air Lock Door Occurred.Caused by Personnel Error.Individual Involved Counseled.W/Undated Ltr ‎ (← links)
  • 05000400/LER-1996-004, :on 960205,RWST Level Transmitters Failed & Violation of TS Action Statement Occurred.Caused by Freezing of Level Transmitter Sensing Lines.Frozen Lines Thawed & Missing Insulation Replaced ‎ (← links)
  • 05000400/LER-1995-011, :on 951105,reactor Trip/Safety Injection Occurred During Solid State Protection Sys Testing Due to Failure of Relay Contact & Unplanned ESF Actuation Occurred During Troubleshooting ‎ (← links)
  • 05000400/LER-1996-003, :on 960122,failed to Perform Core Flux Mapping Following Short Power Excursions Over 100% Power.Caused by Amend 50 Being Incorporated W/O Properly Implementing TS Action Statement.Revised Associated TS Bases ‎ (← links)
  • 05000400/LER-1996-002-01, :on 960117,failure to Perform Required Surveillance Testing During Planned Maint Outage in Oct 1994 Identified.Caused by Personnel Error.Personnel Involved Counseled ‎ (← links)
  • 05000400/LER-1995-016-01, :on 951228,unplanned Esf/Rps Actuation Occurred Due to Unexpected Opening of a RT Breaker During Testing. Caused by Inadequate Procedure.Revised Procedure & Trained Appropriate Personnel ‎ (← links)
  • 05000400/LER-1995-013, Forwards Response to NRC Re Violations Noted in Insp Rept 50-400/95-18.Corrective Actions:Reported Failure to Perform Offsite Power Availibility Verification within One H in LER 95-013 ‎ (← links)
  • 05000400/LER-1995-014-01, :on 940424,RHR Sys Components Removed from Service as Directed During Testing,While Required for Operability.Caused by Procedure Inadequacies.Test Will Be Revised to Correct Procedure by 960215 ‎ (← links)
  • 05000400/LER-1995-013-01, :on 951009,Tech Spec Violation Due to Not Performing off-site Verification.Caused by Cognitive Personnel Error.Individuals Counseled ‎ (← links)
  • 05000400/LER-1995-012-01, :on 951110,containment pre-entry Purge Valve 1CP-1 Drifted Open During Mode-1 Power Operation.Caused by Inadequate Means to Ensure That Air Operated Valves Sealed Closed.Aligned Instrument Air Sys ‎ (← links)
  • 05000400/LER-1995-011-01, :on 951105-06,reactor Trip/Si Signal Generated & Unplanned ESF Actuation Occurred During Troubleshooting. Reactor Trip Caused by Equipment Failure.Component Replaced ‎ (← links)
  • 05000400/LER-1995-006, :on 950824,ECCS Sys Piping Was Not Fully Contained within RAB Emergency Exhaust Sys Boundary Resulted in Condition Outside Design Basis.Periodically Inspected Affected Piping for Leakage ‎ (← links)
  • 05000400/LER-1995-010-01, :on 951012,RT Occurred on Turbine Trip Due to Operator Error During Performance of Turbine Mechanical Overspeed Test.Enhanced Switch Marking & Addl Training for Operating Crews on Command,Control & Teamwork ‎ (← links)
  • 05000400/LER-1995-009-01, :on 951005,unanticipated Actuation of ESF Components While in Refueling Outage 6 Due to Defective Retest Procedure.Revised Temporary Procedure to Reset SI Signal ‎ (← links)
  • 05000400/LER-1995-006-01, :on 950824,determined Discrepancy Re Design of RAB EES Constituted Condition Outside Design Basis.Cause Still Under Investigation.Established Administrative Leakage Limit of 1 Gallon Per Hour ‎ (← links)
  • 05000400/LER-1995-003-01, :on 950518,deficiency Identified in Testing Method for Cooling Water Supply Valves for ESW Intake Structure.Caused by Deficient TS Sps.Surveillance Test Procedures OST-1214 & OST-1215 Revised ‎ (← links)
  • 05000400/LER-1995-004-01, :on 950524,identified Possibility That Blown Fuse in Control Power Circuit Could Affect Hydraulic Pump. Caused by Discrepancy Between Circuit Wiring & Diagrams for Control Board Alarm.Drawing Review Completed ‎ (← links)
  • 05000400/LER-1995-002, :on 950207,unanalyzed Condition Existed Re Potential of Loss of Automatic ESF Actuations & Subsequent TS 3.0.3 Entry.Caused by Both Trains of Ssps Declared Inoperable.Plant Evolutions Avoided ‎ (← links)
  • 05000400/LER-1995-001-02, :on 950119,determined That Deficiency Existed in Operability Verification Test for Thermal Overload Bypass Circuitry Due to Procedural Inadequacies.Review Performed of Applicable Surveillance Test Procedures ‎ (← links)
  • 05000400/LER-1994-007-02, :on 941128,violations of TS Min Control Room Staffing Requirements Occurred.Caused by Personnel Error. Individuals Involved Counseled & Received Disciplinary Measures ‎ (← links)
  • 05000400/LER-1994-006-03, :on 941116,surveillance Testing Revealed That inter-cell Float Voltage for Cell 50 of B-SB Safety Related Battery Outside Allowable TS Limits Due to Deficient Maint Surveillance Test Procedure.Procedure Revised ‎ (← links)
  • 05000400/LER-1994-003-01, :on 940718,improperly Analyzed Single Failure in Esws Occurred That Could Potentially Result in Charging/ Safety Injection Pumps Not Performing Safety Function.Caused by Inadequate Reviews.Review Conducted ‎ (← links)
  • 05000400/LER-1994-005-02, :on 940901,TS Surveillance Violation Occurred. Caused by Personnel Error During Sample Analysis Process. Individuals Involved in Incident Counseled & Event Reviewed W/Applicable E&C Personnel ‎ (← links)
  • 05000400/LER-1994-004-03, :on 940805,discovered That Failures of B EDG Occurred.Caused by Inadequate Procedures & Administrative Controls.Edg Tested & Implemented Increased Test Frequency of Once Per Seven Days on Staggered Test Basis ‎ (← links)
  • 05000400/LER-1994-003-03, :on 940718,single Failure Identified in One Train of Esws That Could Possibly Prevent High Head Charging/Si Pumps from Performing Design Function.Caused by Oversight During Esws Design ‎ (← links)
  • 05000400/LER-1994-002-03, :on 940717,TS Surveillance Violation Occurred Due to Failure to Perform Required RMS Compensatory Measures for TB Wrgm,Declared Inoperable on 940716.Daily SR Procedures Will Be Revised ‎ (← links)
  • 05000400/LER-1994-017, :on 940711,automatic Isolation of RHR Sys Shutdown Cooling Suction Outboard Containment Isolation Valve Occurred Due to Inadequate Work Order.Work Order Process for I&C Work Orders Will Be Reviewed ‎ (← links)
  • 05000400/LER-1994-001-03, :on 940502,discovered That Slave Relay Test for K623 Did Not Verify Actuation of RCDT Pumps Discharge Valve 1ED-121.Caused by Procedural Deficiency in OST-1044. Procedure OST-1044 Has Been Revised ‎ (← links)
  • 05000400/LER-1993-003, :on 930628,discovered Possible Design Deficiency in Containment Vacuum Relief Sys Due to Inconsistent Interpretation of Ts.Reduced Containment Vacuum Relief Automatic Actuation Setpoint ‎ (← links)
  • 05000400/LER-1993-007, :on 930523,unplanned ESF Actuation Occurred Due to Improper Alignment of MOC Switch.Performed Insp to Other 6.9 Kv Breakers.Training & Procedures Revised ‎ (← links)
  • 05000400/LER-1993-009-01, :on 930622,TS Violation Occurred Due to Axial Flux Difference Logging Error.Caused by Personnel Error. Individuals Involved Counseled & Afd Operations Surveillance Test OST-1070 Revised ‎ (← links)
  • 05000400/LER-1993-008-01, :on 930525,TS Violation Occurred Due to Improper Wiring in Containment Penetration Current Limiting Breaker.C/As:Breaker Satisfactorily Tested Per MST-E0006 on 930618 ‎ (← links)
  • 05000400/LER-1993-007-01, :on 930523,SUT to Auxiliary Bus E Supply Breaker 121 Failed to Open Automatically Due to Misaligned Mechanism Operated Cell Switch in Breaker 122.Insp of Other 6.9 Kv Breakers Performed ‎ (← links)
  • 05000400/LER-1993-006-01, :on 930517,automatic Sampling Device Did Not Function During Release of Secondary Waste Sample Tank Due to Failure in Units Electronic Counter.Counter Replaced W/Modified Model ‎ (← links)
  • 05000400/LER-1993-005-02, :on 930428,discoverd That Error Made During Review & Evaluation of Charging/Si Pump (Csip) B Acceptance Test Results.Caused by Personnel Error.Csip B Declared Inoperable ‎ (← links)
  • 05000400/LER-1993-004-02, :on 930413,discovered That Two CR Ventilation Dampers Not Tested within Required Surveillance Interval Due to Personnel Error.Operations Surveillance Test OST-1131 Revised & Event Reviewed by ISI Personnel ‎ (← links)
  • 05000400/LER-1993-002-03, :on 930330,discovered Bearing Failure on Fan AH-92H Concurrent W/Inoperable Train B Essential Svc Chilled Water Chiller.Caused by Loose Bearings Shaft Locking Ring. Air Handling Unit Repaired & Returned to Svc ‎ (← links)
  • 05000400/LER-1993-001-03, :on 930308,discovered That Operations Surveillance Test for Onsite Power Distribution Did Not Check Position of Battery 2CB Input Breakers.Caused by Procedure Rev Oversight.Procedure Revised ‎ (← links)
  • 05000400/LER-1992-014, :on 921013,pipe Wall Thinning Identified in AFW & MFW Sys.Caused by Flow Accelerated Corrosion.Affected Piping Replaced.Addl Matl Upgrades or Sys Configuration Changes Will Be Considered ‎ (← links)
  • 05000400/LER-1991-019, :on 911022,containment Ventilation Isolated Due to Spike on Radiation Monitor,Constituting Unplanned Actuation of ESF Component.Special Test Developed & Performed During Refueling Outage 4 ‎ (← links)
  • 05000400/LER-1992-014-02, :on 921013,identified Excessive Pipe Wall Thinning in Portions of Main Feedwater & AFW Sys.Caused by pre-heater Bypass Vibration Mod.Piping That Exihibited Extensive Erosion Will Be Replaced ‎ (← links)
  • 05000400/LER-1991-008-02, Forwards LER 91-008-02.Rev Discusses Addl Testing Performed on High Head SI Sys During Current Refueling Outage & Mod to Sys Which Will Prevent Recurrence of Event ‎ (← links)
  • 05000400/LER-1992-013-02, :on 920822,discrepancy Noted in EDG Monthly Operability Test Performed on 920726.Caused by Personnel Error.Personnel Counseled,Event Reviewed W/Applicable Personnel & Testing Procedure Revised ‎ (← links)
  • 05000400/LER-1992-012-02, :on 920802,one of Three Secondary Relays Failed to Actuate,Causing TS 3.0.3 to Be Entered.Caused by Failure of under-voltage Relay to Actuate.Procedure Will Be Revised to Provide Guidance for Tripped Condition ‎ (← links)
  • 05000400/LER-1992-011-02, :on 920721,determined That Testing of Emergency Bus Undervoltage Log Circuitry Inadequate.Caused by Inadequately Prepared Surveillance Test procedures.OST-1823 & OST-1824 Will Be Revised ‎ (← links)
  • 05000400/LER-1992-010-02, :on 920717,automatic Turbine Trip & Reactor Trip Occurred Due to Loss of Condenser Vacuum.Caused by Failure of North Low Pressure Turbine Exhaust Boot Seal. Replacement of Boot Seals Completed on 920721 ‎ (← links)
  • 05000400/LER-1992-009-02, :on 920715,manual Reactor Trip/Afw Actuation Occurred Due to Low SG Level.Caused by Inadvertent Deenergization of MFP Recirculation Valve Power Supply. Supply Breaker Replaced ‎ (← links)
  • 05000400/LER-1992-007-02, :on 920712,automatic Turbine Trip & Reactor Trip Occurred Due to Failure of Low Pressure Turbine Exhaust Boot Seal.Repairs to Low Pressure Turbine Exhaust Boot Seal Completed on 920713 ‎ (← links)
  • 05000400/LER-1992-008-02, :on 920713,reactor Tripped Due to lo-lo SG Level.Caused by Operator error.Post-event Debriefing Conducted W/Involved Operations Personnel Re Need for Attention to Detail ‎ (← links)
  • 05000400/LER-1992-006-02, :on 920619,determined That Since 1987 Until May 1992 Excess Flow Check Valves Was Mispositioned.Caused by Personnel Error.Valves Properly Aligned W/Internal Manual Bypass Shut & Procedures Revised ‎ (← links)
  • 05000400/LER-1992-005-02, :on 920527,WRGM Declared Inoperable & Removed from Svc Due to Personnel Error.Additional Training Provided for Personnel Involved ‎ (← links)
  • 05000400/LER-1992-004-02, :on 920422,rev to FSAR Allowed Radiation Monitoring Sys to Be Disfunctional.Caused by Inadequate Safety Review by Util Personnel of Proposed FSAR Rev.Fsar Revised & Database Switches Changed ‎ (← links)
  • 05000400/LER-1992-003, :on 920128,discrepancy Discovered Involving Safety Injection Switch Overtime from Cold Leg to Hot Leg Recirculation.Caused by Inadequate Communication.Night Order Issued Re Recirculation Switchover ‎ (← links)
  • 05000400/LER-1992-002-02, :on 920119,problems Encountered W/Plant Process Computer.Caused by Failure to Restart Program That Performs Sump Leak Rate Calculations & Data Transmission Error.Computer Sys Will Be Upgraded ‎ (← links)
  • 05000400/LER-1992-001-01, :on 920102,standby Injection Pump Room Ventilation Inoperable Due to Misalignment of Manual Damper & Failure to Install 2 Blank Flanges.Caused by Failure to Install Parts During Initial Construction ‎ (← links)
  • 05000400/LER-1991-021-01, :on 911218,error Discovered in Program Utilized to Determine Containment Sump in-leakage Flow Rate.Caused by Personnel Error During Computer Design Development.Erroneous Error Corrected & Event Reviewed ‎ (← links)
  • 05000400/LER-1991-020-01, :on 911204,discovered Deficiency in Radiation Surveillance Test Used for Leak Testing Sealed Sources to Satisfy TS Requirements.Caused by Procedural Deficiency. Procedure Revised & Training Provided ‎ (← links)
  • 05000400/LER-1991-019-01, :on 911022,containment Ventilation Isolation Signal Generated,Resulting in Unplanned Actuation of ESF Component.Caused by Spike on Three Radiation Monitors.Power Supply Circuitry Repaired & Adjusted ‎ (← links)
  • 05000400/LER-1991-018-01, :on 910923,personnel Emergency Air Lock Surveillance Interval Exceeded Surveillance Requirement 4.6.1.3.b.1 of Once Per 6 Months.Caused by Personnel Error. Schedule Revised ‎ (← links)
  • 05000400/LER-1991-017-01, :on 910827,tech Spec Violation Occurred Due to Missed Composite Sample During Release of Secondary Waste Sample Tank.Caused by Personnel Error.Verified That Effluent Stream Contained No Radioactivity ‎ (← links)
  • 05000400/LER-1991-016-01, :on 910808,containment Cooling Water Pump B Started,Resulting in Momentary Pressure Spike Which Caused Three Relief Valves to Open.Caused by Error in Original Sys Design.Personnel Trained Re Valve Setting ‎ (← links)
  • 05000400/LER-1991-010-01, :on 910603,automatic Reactor Trip Occurred Due to Pressure Spike in Flow Transmitter Ref Leg for Reactor Coolant Loop Low Flow.Caused by Perturbation in Sensing Lines.Rcs Flow Calibr Procedures Revised ‎ (← links)
  • 05000400/LER-1991-015, :on 910519,AFW Actuation Occurred.Caused by Improperly Set Feed Flow Transmitter.Investigation, Adjustment & Successful Testing Performed to Restore Feed Flow Transmitter to Svc ‎ (← links)
  • 05000400/LER-1991-009-01, :on 910521,AFW Actuation Occurred Due to Steam Generator Hi-Hi Level Alarm Inadvertently Generated During Troubleshooting.Caused by Personnel Error.Technicians Counseled & Addl Procedural Guidance Developed ‎ (← links)
  • 05000400/LER-1991-012-01, :on 910515,unplanned Actuation of Auxiliary Feedwater Sys Occurred.Caused by Failure of Main Feed Pump a to Start.Investigation & Testing Performed on Pump & Associated Circuitry ‎ (← links)
  • 05000400/LER-1991-013-01, :on 910515,reactor Trip Occurred During Performance of Calibrs.Caused by Personnel Error.Need for Effective Communications Stressed to Applicable Operations Personnel ‎ (← links)
  • 05000400/LER-1991-011-01, :on 910512,identified Required Boration Flowpath Functional But Not Operable for Six Days.Caused by Human Error.Procedure RST-201 Being Revised to Specify Acceptable Range for Boron Concentration ‎ (← links)
  • 05000400/LER-1991-008-01, :on 910403,common-cause Failures Affecting Trains of High Head Safety Injection Identified.Caused by Water Hammer That Apparently Occurred Because of Air Void. Relief Valves Being Rebuilt & Retested ‎ (← links)
  • 05000400/LER-1991-007-01, :on 910325,one Emergency Svc Water Pump Inappropriately Removed from Svc for Outage Work.Caused by Personnel/Mgt Error.Info Re Event Disseminated to Personnel & TS Will Be Annotated ‎ (← links)
  • 05000400/LER-1991-006-01, :on 910319,shutdown Margin Requirements Not Verified During Surveillance Testing on source-range Nuclear Instruments.Caused by Misinterpretation of Tech Specs.Procedures Will Be Revised ‎ (← links)
  • 05000400/LER-1991-004-01, :on 910314,train B Essential Svc Chilled Water Sys Inoperable Due to Unsatisfactory Performance Test Results.Caused by Inability to Verify Check Valve Had Closed.Procedure OPT-1512 Revised ‎ (← links)
  • 05000400/LER-1991-005-01, :on 910313,Tech Spec 3.0.3 Entered Due to Failed Performance Test on Emergency Sequencer B While Csip a Inoperable.Caused by Isolated Contact Failure in B Program Relay.Faulty Relay Replaced ‎ (← links)
  • 05000400/LER-1991-002-02, :on 910305,determined That Underfrequency Reactor Coolant Pump Reactor Trip Inoperable on Train B of Solid State Protection Sys.Caused by Umbilical Cord in Breakers Not Connected.Training Provided ‎ (← links)
  • 05000400/LER-1991-001-01, :on 910225,Tech Spec Violation Due to Missed Surveillance Testing for Control Room HVAC Check Valves. Caused by Procedural Deficiency.Event Will Be Reviewed & ISI Personnel to Perform Comprehensive Review ‎ (← links)
  • 05000400/LER-1991-003-01, :on 910121,missed Surveillance Test During Emergency Diesel Generator Fuel Oil Sampling.Caused by Personnel Error.Training Conducted for Chemistry Personnel & Procedure RST-209 Revised ‎ (← links)
  • 05000400/LER-1991-001, :on 910103,operations Personnel Identified Procedural Deficiency That Resulted in Check Valves Not Being Tested as Required.Caused by Procedural Deficiency. Procedure Revised to Incorporate Testing ‎ (← links)
  • 05000400/LER-1990-025-01, :on 901206,max Allowable Leak Rate for Containment Bldg Pal Exceeded,Per TS 3.6.1.3.b,resulting in Cooldown.Caused by Component Wear.Repairs/Adjustments Performed ‎ (← links)
  • 05000400/LER-1990-023-01, :on 901124,emergency Diesel Generator a Inadvertently Started.Caused by Operator Failure to Correcty Verify Component Under Test.Operator Counseled Re self- Verification ‎ (← links)
  • 05000400/LER-1990-024, :on 901121,64 Bussman Fnm Type Fuses in 125- Volt safety-related Applications Found Unacceptable.Caused by Recent Downgrade in Fuse Performance Specs Provided by Vendor.Fuses Replaced,Per Plant Mod PCR-5549 ‎ (← links)
  • 05000400/LER-1990-022-01, :on 901108,missed Surveillance Test for Secondary Waste Sample Tank Due to Incorrect Procedure Rev ‎ (← links)
  • 05000400/LER-1990-021-01, :on 901026,Tech Spec Violation Identified Due to Area Temp Monitoring Not Being Performed ‎ (← links)
  • 05000400/LER-1990-019-01, :on 900824,potential Loss of RHR Sys Noted Due to Loss of Ccw.Caused by Sys Design ‎ (← links)
  • 05000400/LER-1990-018, :on 900823,loss of Component Cooling Water Inventory Occurred.Caused by Lifted Reactor Coolant Drain Tank HX Valve Caused by Incorrect Relief Valve Setpoint. Inlet Isolation Valve Administratively Closed ‎ (← links)
  • 05000400/LER-1990-010, :on 900405,control of Reactor Auxiliary Bldg Emergency Exhaust Pressure Boundary Not Implemented.Caused by Lack of Administrative Controls for Doors & Hatches. Administrative Controls Implemented ‎ (← links)
  • 05000400/LER-1990-017, :on 900620,several Attempts to Start Train 1B-SB of Essential Svcs Chilled Water Failed.Caused by Mispositioned Root Isolation Valve.Position of Valve Corrected & Vendor Valves Tagged ‎ (← links)
  • 05000400/LER-1990-012, :on 900415,Train a Emergency Bus Deenergized & Diesel Generator Automatically Started & Loaded Via Load Sequencer.Caused by Timing of Blocking Relay Actuating During Testing.Test Circuit Being Redesigned ‎ (← links)
  • 05000400/LER-1990-016, :on 900529,invalid Testing of Fuel Handling Bldg Emergency Exhaust Filtration Unit Occurred.Caused by Inadequate Location of Duct Flowrate Measurements.Test Procedure for Filtration Units Will Be Revised ‎ (← links)
  • 05000400/LER-1990-015, :on 900524,concluded from Evaluation That Failure of Microswitch Contacts Could Prohibit Proper Sequencer Response to Safety Injection & Loss of Offsite Power Signals.Caused by Design Deficiency ‎ (← links)
  • 05000400/LER-1990-014, :on 900516,discovered That Two Liquid Radioactive Releases Initiated on 900513 Were in Excess of Flow Rate Specified on Release Permits.Caused by Personnel Error.Max Release Rate Must Be Recorded ‎ (← links)
  • 05000400/LER-1990-013, :on 900503,valve Misalignment Caused Unplanned Release from Waste Gas Sys to Waste Process Bldg Vent Stack 5.Valve Position Corrected,Procedures Changed & Training of Personnel Initiated ‎ (← links)
  • 05000400/LER-1990-011, :on 900405,Tech Spec Violation Occurred Due to Missed Tests on Valve.Caused by Procedural Deficiencies. Procedures Revised & Plant Personnel Trained ‎ (← links)
  • 05000400/LER-1990-007, :on 900321,waste Gas Decay Tanks Noble Gases Miscalculated.Caused by Inaccurate Interpretation of Term in Tech Spec.Procedure Revised to Incorporate Approximate Xe-133 Dose Equivalency Weighting Factors ‎ (← links)
  • 05000400/LER-1990-009, :on 900324,containment Sump Leak Rate Sys Declared Inoperable Due to Frequent Invalid Alarms & Manual Logging Commenced.Caused by Procedural Weakness.Surveillance Test Re RCS Leakage Evaluation Revised ‎ (← links)
  • 05000400/LER-1990-008, :on 900314,discrepancy in Amperage Rating of Circuit Breaker Providing Overcurrent Protection for Containment Penetration Conductor Discovered.Caused by Use of Oversized Breaker.Breaker Upsized ‎ (← links)
  • 05000400/LER-1990-006, :on 900309,discovered That Evolution Violated Requirements of FSAR to Keep Individual Tanks Isolated from Another Tank.Caused by Failure to Address Evolution in Operating Procedure.Procedure Revised ‎ (← links)
  • 05000400/LER-1990-005-01, :on 900307,engineered Safety Sys Feature Actuation Occurred Due to Radiation Monitor Spike.Caused by Loose Pin Connection in Coaxial Cable Connector.Maint Surveillance Test Revised ‎ (← links)
  • 05000400/LER-1990-004-01, :on 900227,Tech Spec Violation Due to Missed Leak Rate Evaluation.Caused by Procedural Weakness.Procedure to Be Revised to Ensure Leak Rate Evaluation Will Be Completed within Required Time Span ‎ (← links)
  • 05000400/LER-1990-002-03, :on 891228,alarm for Quadrant Power Tilt Ratio Found Inoperable.Caused by Operator Reading Incorrect Scale. Calibr Performed.Addl Guidance Added to Alarm Response Procedure ‎ (← links)
  • 05000400/LER-1990-003-01, :on 900220,Tech Spec Violation Occurred When Both Trains of Essential Svcs Chilled Water Inoperable. Caused by Air Binding in Pump P-4.Both Trains Returned to Operable Status.Venting Procedures Developed ‎ (← links)
  • 05000400/LER-1989-023-01, :on 891223,significant Difference Between Actual & Indicated Reactor Power Level for power-range Nuclear Instruments Noted.Caused by Installation of Low Leakage Core Loading Pattern W/O Adjustments ‎ (← links)
  • 05000400/LER-1990-001-01, :on 900105,discovered That Temporary Change Issued During Channel 2 Testing of Bistables & Slave Relays During 1988 Outage Incorrect.Caused by Error in Implementing Procedure Changes.Maint Procedures Revised ‎ (← links)
  • 05000400/LER-1989-021-02, :on 891227,ESFAS Actuation Occurred Due to Loss of Main Feedwater Pump.Caused by Personnel Error.Sampling Valve Repaired,Appropriate Procedure Revised & Applicable Personnel Trained on low-flow Trips ‎ (← links)
  • 05000400/LER-1989-020-02, :on 891031,jumper Wires in Limitorque Operator for Pressurizer PORV Block Valve 1RC-117 Found Contaminated W/Grease Leaking from Gear Box.Caused by Overfilling Gear Box.Wires Repaired/Replaced ‎ (← links)
  • 05000400/LER-1989-018-02, :on 891207,as Control Rod Bank a Withdrawn,Rod B-10 Indicator Indicated 6 Steps Withdrawn When Rest of Control Bank a Indicated 12 Steps Withdrawn.Caused by Cable Failure.Work Request Authorization Issued ‎ (← links)
  • 05000400/LER-1989-017-01, On 891009,generator & Main Power Transformer Phase Differential Relay Tripped Lockout Relay.Caused by Multiple Ground Faults.Design Changes & Repairs Being Conducted While Plant Performs Refueling ‎ (← links)
  • 05000400/LER-1989-017-03, :on 891009,turbine & Reactor Tripped Due to Generator & Main Power Transformer Phase Differential Relay Trip.Caused by Multiple Shorts to Ground.Design Changes & Repairs Being Conducted ‎ (← links)
  • 05000400/LER-1989-016-01, :on 890911,emergency Safeguards Sequencer Failed to Reset Following Test Generating Start Signal to Emergency Svc Water Pump 1B-SB.Caused by Overloading of Test Relay Contacts.Sequencer Evaluation Performed ‎ (← links)
  • 05000400/LER-1989-015-01, :on 890827,discovered That Fuel Handling Bldg Operating Floor Equipment Hatch in Storage Location on Operating Deck Not Installed as Required.Caused by Inadequate Procedure.Procedure Revised ‎ (← links)
  • 05000400/LER-1989-014-01, :on 890821,determined That Two Accessible Discharge Piping High Point Vents Not Verified Full of Water at Least Once Per 31 Days.Caused by Procedural Deficiency. Vents Verified Free of Air & Procedure Revised ‎ (← links)
  • 05000400/LER-1989-013-01, :on 890814,technician Inadvertently Jumpered Contacts Starting Emergency Svc Water Booster Pump B.Caused by Personnel Error.Testing Stopped & Personnel Counselled on Attention to Work Activities ‎ (← links)
  • 05000400/LER-1989-012-01, :on 890630,required Continuous Sampling of Release of Secondary Waste Sample Tank Not Performed.Caused by Personnel Error.Grab Sample of Secondary Waste Analyzed W/No Radioactivity Detected.Procedure Revised ‎ (← links)
  • 05000400/LER-1989-011-01, :on 890607,inaccurate Reading from Resistance Temp Detector (RTD) Used to Measure Thermocouple Ref Junction Box Temp Reported.Caused by Corrosion of RTD Terminal Contacts.Connection Repaired ‎ (← links)
  • 05000400/LER-1989-010-01, :on 890529,Tech Specs Violation Occurred When Performing Incorrect Reactor Coolant Analysis.Caused by Personnel Error.Correct Analysis for Sample Completed. Technician Involved Counseled ‎ (← links)
  • 05000400/LER-1988-002-02, :on 880119,vent Stack 5A Wide Range Gas Monitor Rm 1WV-3547-1 Declared Inoperable,Per Tech Spec 3.3.3.11. Caused by Maint Surveillance Test Not Being Completed as Scheduled.New Procedure Initiated ‎ (← links)
  • 05000400/LER-1989-009-01, :on 890501,discovered That Monitoring for Radioactivity in Turbine Bldg Floor Drain Effluent Not Performed from 890429-30.Caused by Isolation of Sample Collection Path for Calibr of Detector ‎ (← links)
  • 05000400/LER-1989-008-01, :on 890410,deficiencies Discovered in Testing of Thermal Overload Bypass Circuit for motor-operated Valve. Caused by Procedural Inadequacies Which Resulted in Insufficient Testing of Circuit ‎ (← links)
  • 05000400/LER-1989-006-01, :on 890314,reactor Tripped on Low Level in Steam Generator a Approx 71 After Main Feedwater Pump B Tripped.Caused by Short in Motor Lead Allowing Water to Enter Junction Box.Missing Bolts Replaced ‎ (← links)
  • 05000400/LER-1989-005-01, :on 890222,reactor Trip on Low Steam Generator Level W/Steam/Feedwater Flow Mismatch Occurred During Calibr Test Procedure.Caused by Performance of Section of Procedure Intended to Be Conducted.Procedure Revised ‎ (← links)
  • 05000400/LER-1989-001, :on 890116,w/plant in Mode 1,reduction of Turbine Load Ensued & Turbine Trip Occurred Due to Low Condenser Vacuum Resulting in Automatic Reactor Trip.Caused by Personnel Error.Personnel Counselled ‎ (← links)
  • 05000400/LER-1989-003-02, :on 890206,shaft of Main Feedwater Pump a Sheared,Causing Sudden Reduction in Feedwater Flow to Steam Generators & Pump Trip.Caused by Corrosion in Shaft.Pump & Local Components Repaired ‎ (← links)
  • 05000400/LER-1989-004, :on 890207,loss of All Three Circulating Water Pumps Resulted in Loss of All Flow to Main Condenser, Causing Reactor Trip.Caused by Air Entering Circulating Water Pump Seal Water Sys.Components Repaired ‎ (← links)
  • 05000400/LER-1989-001-02, :on 890116,while Restoring Direct Vent Path to Atmosphere,Turbine Load & Turbine Trip Occurred Due to Low Condenser Vacuum.Caused by Lack of Shift Foreman Clearance on Manual Valve.Personnel Counseled ‎ (← links)
  • 05000400/LER-1989-002, :on 890117,water Inadvertently Drained from Spent Fuel Pool to New Fuel Pool.Caused by Incorrect Determination of Valves Position During Process of Removing Clearance.Spent Fuel Pool Level Restored ‎ (← links)
  • 05000400/LER-1988-033, :on 881125 & 1202,declared Charging Safety Injection Pump (Csip) Inoperable.Caused by 1C Csip Scantily Covered in ESF Response Surveillance Test Procedures.Test to Verify 1C Csip Response Time Completed ‎ (← links)
  • 05000400/LER-1988-034, :on 881205,fan Motor to Heating & Ventilation Equipment Room Found Not Electrically Connected to Power Supply.Caused by Inadequate Communications & Failure to Obey Procedures & Implement post-maint Testing ‎ (← links)
  • 05000400/LER-1988-032, :on 881030,manual Reactor Trip Upon Loss of Main Feedwater Occurred.Caused by Trip of Heater Drain Pumps Attributed to Plywood Cover Left Inside Feedwater Heater 3A Following Maint.Plywood Cover Removed ‎ (← links)
  • 05000400/LER-1988-031, :on 880614-21 & 0723-26,wide Range Gas Monitor Inoperable & Compensatory Actions Not Taken or Documented as Being Taken as Required Due to Personnel Error.Caused by Failure to Install EC4-X as Required ‎ (← links)
  • 05000400/LER-1988-028, :on 881014,plant Tripped Due to Loss of Feedwater Caused by Low Condenser Hot Well Level.Caused by Low Level in Condenser Hot Well.Failed Relay Coil Replaced ‎ (← links)
  • 05000400/LER-1988-030, :on 881008,steam Generator Pressure in turbine- Driven Auxiliary Feedwater Pump Steam Supply Heater Noted. Caused by Inadequate Shift Turnover During Valve Repair During Outage.Valve Seated Properly ‎ (← links)
  • 05000400/LER-1988-027, :on 880907,chemistry Technicians Failed to Obtain Gas Grab Sample at Required Time.Specific Technician Designated to Perform Compensatory Sampling Until All Compensatory Surveillance Requirements Met ‎ (← links)
  • 05000400/LER-1988-029, :on 880915,short Equipment Start Pulses Generated,Causing Safety injection,motor-driven Auxiliary Feedwater & Emergency Svc Water Pumps to Start.Caused by Failure of Relay in Sequencer Test Circuit ‎ (← links)
  • 05000400/LER-1988-026, :on 880831,cracking of Insulation on Wires & on Terminal Blocks in Top Works Portion of Valves Noted.On 880909 Concluded Valves Inside Containment Not Qualified for Harsh Environ Following Postulated Accident ‎ (← links)
  • 05000400/LER-1988-024, :on 880812,maint Surveillance Tests Verifying Nuclear Instrumentation Source Range Monitor Operability Not Performed Prior to Mode 6 Entry.Caused by Deficient Planning & Scheduling.Surveillance Tests Scheduled ‎ (← links)
  • 05000400/LER-1988-023, :on 880812,reactor Coolant Sys Vent Less than Required by Tech Spec 3.4.9.4 for Low Temp Overpressure Protection.Caused by Failed Valve Gagging Device.Longer Gagging Device Installed ‎ (← links)
  • 05000400/LER-1988-022, :on 880809,vent Stack Flow Rate Estimates Not Done Per Tech Specs.Caused by Personnel Error.Personnel Involved Counseled & on-shift Operators Reminded of Importance of Attention to Detail ‎ (← links)
  • 05000400/LER-1988-020, :on 880806,wide Range Gas Monitor Inoperable Due to Loss of Sample Flow & Compensatory Actions Not Taken. Caused by Personnel Error.Procedure Revised for Addl Checks on Monitors & Personnel Received Addl Training ‎ (← links)
  • 05000400/LER-1988-021, :on 880809,automatic Start of Auxiliary Feedwater Pump Occurred While Performing Operational Surveillance Test OST-1826.Caused by Procedural Deficiency. Procedures Revised ‎ (← links)
  • 05000400/LER-1988-019-01, :on 880730,both source-range Nuclear Detectors NI-31 & NI-32 Failed Low & Declared Inoperable.Caused by Short in Inner Shield to Ctr Conductor & Faulty Cable connector.Source-range Detectors Replaced ‎ (← links)
  • 05000400/LER-1988-018-01, :on 880730,main Feedwater Pump Tripped Due to Low Flow During Normal Shutdown for Scheduled Refueling Outage.Caused by Low Setpoint on Recirculation Flow Switch Drifting Out of Calibr Low.Switch Calibrated ‎ (← links)
  • 05000400/LER-1988-017-01, :on 880726,Tech Spec 3.7.7 Violated.Caused by Inoperability of Emergency Svc Water Pump a & Train a Essential Svcs Chilled Water Sys.Bay Inspected Under Water & Traveling Screen Operation W/Bay Drained ‎ (← links)
  • 05000400/LER-1987-059, :on 871011,incoming Line Breaker Tripped Initiating Safety Bus Blackout.Caused by Hammering & Drilling of in Relay Cabinet by Employee.Switchyard Breaker Reclosed & off-site Power Restored to Bus ‎ (← links)
  • 05000400/LER-1988-012, :on 880512,emergency Svc Water (ESW) Sys Declared Inoperable & on 880513,attempt to Close Valves Failed Rendering Train a Inoperable.Cause of Valve Failure Unknown.Plant Change Request 2878 Approved ‎ (← links)
  • 05000400/LER-1988-011-01, :on 880511,Westinghouse Notified Plant of Unanalyzed Condition Re Inadvertent Actuation of Low Temp Overpressure Protection Sys.Automatic Actuation Function Disabled & Permanent Mod Under Consideration ‎ (← links)
  • 05000400/LER-1988-009-03, :on 880422,discovered That on 880419 Tech Spec 3.0.3 Violated.Caused by Train a Being Placed in Test While Train B Declared Inoperable for Maint & Testing Due to Personnel Error.Procedures Will Be Revised ‎ (← links)
  • 05000400/LER-1988-007, :on 880309,several Alarms Received by Operators at Main Control Board Indicating Low Water Level in Steam Generator B.Caused by Failed Renewable Fuse.Fuse Replaced ‎ (← links)
  • 05000400/LER-1988-001, :on 880115,procedural Deficiency Which Could Have Resulted in Failure of ECCS During Recirculation Phase of Accident Identified.Caused by Failure to Note New Requirement in Procedure.Procedures Revised ‎ (← links)
  • 05000400/LER-1988-008, :on 880217,emergency Svc Water Pump Started Then Tripped.Caused by Problem W/Overcurrent Relay. Overcurrent Relay Replaced & Emergency Safeguards Sequencer Sys Test Procedure Revised ‎ (← links)
  • 05000400/LER-1988-005-01, :on 880201,discovered That Two Valves for Turbine Bldg Vent Stack 3A Wide Range Gas Monitor Were Mispositioned.Caused by Procedural Deficiency.Valve Lineup for Monitor Skid Corrected ‎ (← links)
  • 05000400/LER-1988-004-01, :on 880125,resultant Level Indication Revealed That Actual Tank Level Was Less than That Required by Tech Spec 3.6.2.2.Caused by Air Trapped in Sensing Lines of Level Transmitters.Sensing Line Vented ‎ (← links)
  • 05000400/LER-1988-003-01, :on 880121,peak Reactor Power of 103% Reached. Caused by Jumper Wire Installed in Train a of solid-state Protection Sys Cabinet.Extensive Wire Check Conducted for Addl Wiring Errors & Evaluation of Safety ‎ (← links)
  • 05000400/LER-1988-001-02, :on 880115,emergency Operating Procedure (EOP) Deficiency for Switchover to Recirculation After LOCA Discovered.Caused by Failure to Incorporate FSAR Change Into Plant Procedures.Eops Revised ‎ (← links)
  • 05000400/LER-1988-002-01, :on 880119,vent Stack wide-range Gas Monitor RM 1WV-3547-1 Declared Inoperable Under Tech Spec 3.3.3.11, Due to Missed Maint Surveillance Test on 871227.Caused by Procedural Deficiency.Procedure Revised ‎ (← links)
  • 05000400/LER-1987-064, :on 871102 & 1218,waste Processing Bldg Vent Stack 5A Wide Range Gas Monitor 1WV-3547-1 Declared Inoperable W/O Required Special Rept Submitted.Caused by Personnel Error.Procedure OMM-003 Revised ‎ (← links)
  • 05000400/LER-1987-067, :on 871214,containment Ventilation Isolation Occurred Due to High Radiation Alarm While Grab Sampling at Monitor REM-1LT-3502A-SA.Caused by Personnel Error & Eletronic Signal Spike.Sample Line Labeled ‎ (← links)
  • 05000400/LER-1987-065, :on 871124,P-13 Channel Declared Inoperable Due to Incorrect First Stage Turbine Pressure Setpoints for P-13 Permissive.Caused by Personnel Error.Applicable Compensatory Action & Plant Change Request Initiated ‎ (← links)
  • 05000400/LER-1987-058, :on 871009,RCS Leakage Exceeded Tech Specs Limits When Valves in RCS Head Vent Sys Spuriously Opened During Testing.Caused by Inadvertent Opening of Down Stream Valves.Personnel Briefed on Design of Valves ‎ (← links)
  • 05000400/LER-1987-062, :on 871107,safety Injection Sys & Main Steam Line Isolation Actuated & Reactor Tripped Due to Low Steam Line Pressure on Steam Generator A.Caused by Personnel Error & Procedure Deficiency.Procedure Revised.W/Ltr ‎ (← links)
  • 05000400/LER-1987-063, :on 871108,plant Tripped Due to Loss of Main Feedwater.Caused by Mispositioned Condensate Recirculation Valve Due to Personnel Error.Operating Procedure Revised to Include Lessons from Event & Crews Briefed ‎ (← links)
  • 05000400/LER-1987-060, :on 871015,isolation Valves Between RCS & RHR Pump Suctions Closed on Two Separate Occasions.Caused by Shorting of Test Equipment Output & Battery Failure in Test Equipment.Revs to Procedures Being Considered ‎ (← links)
  • 05000400/LER-1987-061, :on 871016,flow Rate Instruments for Waste Processing Bldg Vent Stacks 5 & 5A Declared Inoperable. Caused by Personnel Error.Meeting Held to Discuss Similar Event.Operator Involved Counseled on Item ‎ (← links)
  • 05000400/LER-1987-053, :on 870813,valve 1BD-11 Discovered Inoperable After Failing Inservice Insp Test.Caused by Valve Failure Due to Binding of Carbon Seal Rings Between Valve Cage & Valve Plug.Valve Repaired ‎ (← links)
  • 05000400/LER-1987-052, :on 870831,mechanic & Health Physics Technician Exiting Containment Through Personnel Access Hatch When One of Door o-ring Seals Fell Out of Groove.Caused by Personnel Error.Work Request Issued to Repair Door ‎ (← links)
  • 05000400/LER-1987-057, :on 870929,deficiency in Surveillance Test Procedures Covering Diesel Generator Fuel Oil Transfer Pumps Revealed.Caused by Misinterpretation of Relief Granted by Nrc.Procedure Revised ‎ (← links)
  • 05000400/LER-1987-056, :on 870924,reactor Tripped Due to Deenergization of P-13 Permissive Bistable.Caused by Personnel Error Due to Insufficient Instructions.Procedure for Mod Implementation Revised ‎ (← links)
  • 05000400/LER-1987-055, :on 870917,containment Integrity & Tech Spec 3.6.1.3,Action a Violated.Caused by Personnel Error. Personnel Being Trained on Proper Use of Containment Personnel Access Doors ‎ (← links)
  • 05000400/LER-1987-054, :on 870915,determined That More Limiting Single Failure Might Exist & on 870916,two Addl Potential Failure Modes Identified & Plant Shut Down.Caused by Design Error. Solid State Protection Sys Modified ‎ (← links)
  • 05000400/LER-1987-050, :on 870830,RCS Unidentified Leakage Exceeded 1 Gallon Per Minute & on 870831 Insp Showed Evidence of Minor Leaks Due to Normal Wear.Caused by Equipment Failure. Valve Packing Repairs Initiated ‎ (← links)
  • 05000400/LER-1987-043, :on 870820,discovered That Six Manual Isolation Valves Not Included in Operations Surveillance Test OST-1029.Caused by Personnel Error.Test Revised to Include Valves in Monthly Verification of Position ‎ (← links)
  • 05000400/LER-1987-048, :on 870811,failure to Take 9:30 Am Reading of Axial Flux Difference (Afd) as Required by Tech Specs Discovered.Caused by Personnel Error.Operator Disciplined. Addl Guidance Being Provided to Operators ‎ (← links)
  • 05000400/LER-1987-047, :on 870804-05,auxiliary Feedwater Actuations Occurred Due to Trips of Main Feedwater Pump 1A.Caused by Discharge Pressure Switches Out of Calibr.Discharge Pressure Switches Recalibr ‎ (← links)
  • 05000400/LER-1987-041, :on 870804,restoration Alignment on Clearance for Placing Dryer 1B Back Into Svc Incorrect.Caused by Personnel Error.Valve Lineup for Instrument Air Dryer 1B Put Into Correct Configuration ‎ (← links)
  • 05000400/LER-1987-046, :on 870722,main Feedwater Pump B Tripped Due to Low Flow Resulting in Automatic Start of Auxiliary Feedwater Pumps.Caused by Loose Linkage on Recirculation Valve Due to Vibration.Valve Repaired.Procedures Changed ‎ (← links)
  • 05000400/LER-1987-045, :on 870716,RCS Pressure Fell Below Accumulator Pressure,Initiating Partial Injection of All Three Accumulators.Caused by Reactor Operator Error.Operating Shift Disciplined & Procedure Revised ‎ (← links)
  • 05000400/LER-1987-040, :on 870630,discovered That Surveillance Interval for Calorimetric Exceeded.Caused by Personnel Error.Night Order Issued Instructing Personnel on Importance of Performing Surveillances ‎ (← links)
  • 05000400/LER-1987-011, :on 870307,breaker Tripped Open Causing de-energization of Auxiliary Bus 1E.Caused by Procedural Inadequacy.Defective PIC Card in Power Supply to LT-112 Relay Replaced & Procedure Revised ‎ (← links)
  • 05000400/LER-1987-038, :on 870622,high Steam Generator Water Level Turbine Trip & Main Feedwater Isolation Actuated Automatic Reactor Trip on Interlock.Caused by Sudden Increase in Electrical Load.Precautionary Measures Taken ‎ (← links)
  • 05000400/LER-1987-039, :on 870619,intermediate Range (IR) High Neutron Flux Trip Setpoint Found Out of Calibr.Caused by Previous Adjustment to IR Setpoints.New Scaling Currents for 25% Trip Incorporated Into Applicable Procedures ‎ (← links)
  • 05000400/LER-1987-037, :on 870621,manual Reactor Trip Initiated from 30% Power After Operating Main Feedwater Train Tripped. Caused by Failed Open Feedwater Pump Recirculation Valve. Circuit Repaired & Plant Returned to Svc ‎ (← links)
  • 05000400/LER-1987-036, :on 870621,air Roll of 1A-SA Diesel Engine Not Performed within 4 to 8 H After Engine Shutdown.Caused by Marking in Test Procedure Step as Not Applicable.Engine Air Rolled.No Accumulation of Water Detected ‎ (← links)
  • 05000400/LER-1987-034, :on 870611,air Leakage by Inner & Outer Doors of Personnel Air Lock Excessive.Caused by Flat Spots on O-ring Seal.Seals on Inner & Outer Doors Replaced & Procedure OMM-001 Revised ‎ (← links)
  • 05000400/LER-1987-035, :on 870617,reactor Coolant Pump C Tripped, Resulting in Reactor Trip Due to Low Flow in Reactor Coolant Loop C.Caused by Physical Contact W/Bus Encl.Program to Check & Drain Steam Supply Lines Initiated ‎ (← links)
  • 05000400/LER-1987-033, :on 870607,experienced Trouble W/Engine Barring Device Not Rotating Engine as Required Using Plant Svc Air. Caused by Low Plant Svc Air Pressure.Mod Installed Attaching Engine Barring Device to Starting Air Tank Air ‎ (← links)
  • 05000400/LER-1987-031, :on 870524,while Operating at 100% Power,Heater Drain Pump a Tripped.Caused by Failure of Discharge Valve on Heater Drain Pump a Due to Faulty Valve Positioner.Control Valve Positioner Repaired ‎ (← links)
  • 05000400/LER-1987-030, :on 870512,Maint Surveillance Tests I0140, I0141 & I0142 for P-12 Interlock Missed Thus Violating Tech Specs Requirements.Caused by Personnel Error.Procedures Revised ‎ (← links)
  • 05000400/LER-1987-028, :on 870502,manual Turbine Trip Initiated During Performance of Power Ascension Test Procedure 9108-S-14. Caused by Tandem Trip of Both Heater Drain Pumps.Evaluation of Feedwater Response to Transients Continues ‎ (← links)
  • 05000400/LER-1987-027, :on 870426,during Test,Redundant Transmitter Pressurizer Pressure Channels Declared Inoperable.Caused by Two Out of Three Channels Out of Calibr & Reading Low. Channels Recalibr & Test Completed ‎ (← links)
  • 05000400/LER-1987-026, :on 870423 & 24,main Feedwater Pump Tripped & Actuated motor-driven Auxiliary Feedwater Pumps.Caused by Trip of Condensate Booster Pump.Main Feedwater Restored & Pumps Secured.Control Logic Under Evaluation ‎ (← links)
  • 05000400/LER-1987-023, :on 870420,alternate Miniflow Valves for Charging Safety Injection Pump Found Isolated.Verification of Correct Valve Lineup Unavailable.Caused by Personnel Error.Procedure OP-107 Being Revised ‎ (← links)
  • 05000400/LER-1987-025, :on 870422,while Operating at 99% Power,Heater Drain Pump a Tripped from Low Flow Signal.Caused by Failure of Discharge Valve on Pump.Separated Air Connection on Pump Discharge Valve Repaired ‎ (← links)
  • 05000400/LER-1987-024, :on 870421,heater Drain Pumps a & B Tripped Due to Low Differential Pressure & Automatic Turbine Runback Initiated.Caused by Oscillating Feedwater Heater Levels.Pump Low Level Trip Setpoint Lowered ‎ (← links)
  • 05000400/LER-1987-015, :on 870325,noble Gas Grab Sample Not Taken. Caused by Personnel Error.Grab Sample Taken on 870326.Event Reviewed W/Staff & Personnel Counseled ‎ (← links)
  • 05000400/LER-1987-017, :on 870331,reactor Trip Occurred Due to Steam Flow/Feedwater Flow Mismatch.Caused by Feedwater Control Valve Oscillation.Main Feedwater Regulating Valves Placed in Manual Control ‎ (← links)
  • 05000400/LER-1987-016, :on 870323 & 26,turbine Bldg Vent Stack Monitor Declared Inoperable Due to Problems W/Water in Monitor.On 870327,monitor Declared Operable & Lined Up to Sample Stack. Turbine Bldg Vent Stack Reinstated ‎ (← links)
  • 05000400/LER-1987-013, :on 870313,plant Manually Tripped at 49% Power Due to Loss of Main Feedwater.Caused by High Discharge Pressure Spike of Condensate Booster Pumps.Feedwater Regulating Valves Stroked ‎ (← links)
  • 05000400/LER-1987-014, :on 870314,three Pressure Gauges Installed, Placed in Svc & Opened on Three Drain Lines Whose Isolation Valves Considered Containment Isolation Valves in Violation of Tech Specs.Caused by Personnel Error ‎ (← links)
  • 05000400/LER-1987-012, :on 870311,turbine & Reactor Trips Occurred During Troubleshooting at Main Turbine Supervisory Control Panel.Turbine Trip Caused by Depressing Test Push Button on Turbine Supervisory Control Panel ‎ (← links)
  • 05000400/LER-1988-006, :on 880208,emergency Svc Water Sys Declared Inoperable.Caused by Isolation Valve Failures.Valves Repaired & Retested.On 880212,after Concern Raised,Manual Valve Closed,Pending Permanent Design Change ‎ (← links)
  • 05000400/LER-1987-032, :on 870602,radiation Monitor REM-21WL-3541 Sample Chamber Instead of REM-21WS-354 Drained for Disconnection Leaving Monitor Inoperable.Caused by Personnel Error.Procedure HPP-495 Prepared ‎ (← links)
  • 05000400/LER-2016-007, Regarding Containment Spray System Valve Actuation ‎ (← links)
  • 05000400/LER-2016-006, For Shearon Harris Nuclear Plant, Unit 1 Regarding Reactor Vessel Closure Head Penetration Nozzle Indications Attributed to Primary Water Stress Corrosion Cracking and a Weld Fabrication Void ‎ (← links)
  • 05000400/LER-2016-005, Regarding Offsite Power Undervoltage Caused Actuation of Several Systems ‎ (← links)
  • 05000400/LER-2016-004, Regarding Reactor Trip and Safety Injection During Turbine Control Testing at Low Power ‎ (← links)
  • 05000400/LER-2016-003, Regarding Containment High-Range Radiation Monitors Declared Inoperable Due to Potential for Temperature Induced Current ‎ (← links)
  • 05000400/LER-2016-002, Regarding a Essential Services Chilled Water Chiller Trip Due to Oil Leak from Failed Tube Fitting ‎ (← links)
  • 05000400/LER-2016-001, Regarding Inadequate Protection from Tornado Missiles Identified Due to Nonconforming Design Conditions ‎ (← links)
  • 05000400/LER-2015-005, Regarding Unrecognized Impact of Opening of Barrier Doors on High Energy Line Break Analysis ‎ (← links)
  • 05000400/LER-2015-004, Regarding Failure of a Train Emergency Service Water Pump ‎ (← links)
  • 05000400/LER-2015-002, Regarding Breakers to the a and B Train Control Room Normal Intake Isolation Damper Motor Actuators Tripped Open ‎ (← links)
  • 05000400/LER-2015-003, Regarding Reactor Vessel Head Nozzle Repairs ‎ (← links)
  • 05000400/LER-2015-001, Regarding Safety Valve Setpoint Drift ‎ (← links)
  • 05000400/LER-2014-003, Regarding Diesel Fuel Oil Storage Building Moderate Energy Line Break Design Deficiency ‎ (← links)
  • 05000400/LER-2014-002, Regarding Inadequate DC Cable Protection Could Adversely Affect Safe Shutdown ‎ (← links)
  • 05000400/LER-2014-001, Re Manual Reactor Trip Due to Indications of a Fire ‎ (← links)
  • 05000400/LER-2013-003, Regarding Reactor Pressure Vessel Head Penetration Nozzle 37 Indication Attributed to Primary Water Stress Corrosion Cracking ‎ (← links)
  • 05000400/LER-2013-004, Regarding Operation Prohibited by Technical Specification Due to Exceeding Hydrogen and Oxygen Concentrations in the Waste Gas System ‎ (← links)
  • 05000400/LER-2013-002, Regarding Main Steam Safety Valve Setpoint Drift ‎ (← links)
  • 05000400/LER-2013-001, Regarding Reactor Pressure Vessel Head Penetration Nozzle Indications Attributed to Primary Water Stress Corrosion Cracking ‎ (← links)
  • 05000400/LER-2012-003, For Shearon Harris, Unit 1, Regarding Primary Shield Cooling Fan Fails to Secure as Required ‎ (← links)
  • 05000400/LER-2012-002, Regarding Missed Surveillance Resulting in Inoperable Containment Penetration Overcurrent Protection Devices ‎ (← links)
  • 05000400/LER-2012-001, Regarding Delayed Closure of Main Steam Isolation Valves Due to Corrosion ‎ (← links)
  • 05000400/LER-2011-002, Regarding Emergency Diesel Generator Inoperable Due Mechanical Governor Speed Setting Drift ‎ (← links)
  • 05000400/LER-2011-001, Regarding Containment Vacuum Relief System Inoperable for Greater than Time Allowed by Technical Specification ‎ (← links)
  • 05000400/LER-2010-004, Unit 1 Valid Actuation of B Emergency Diesel Generator Due to Loss of B-SB 6.9kV Safety Bus ‎ (← links)
  • 05000400/LER-2010-005, For Harris Nuclear Plant, Unit 1 Regarding Emergency Core Cooling System (ECCS) Inoperable for Greater than Time Allowed by Technical Specifications ‎ (← links)
  • 05000400/LER-2010-003, For Harris, Unit 1, Regarding Condition Prohibited by Technical Specifications When Non-Seismic System Was Aligned to Refueling Water Storage Tank ‎ (← links)
  • 05000400/LER-2010-002, Manual Actuation of the Reactor Protection System Due to Hydrogen Seal Oil Leak ‎ (← links)
  • 05000400/LER-2010-001, Unit 1 Regarding Clearance Error Results in Required Equipment Becoming Inoperable ‎ (← links)
  • 05000400/LER-2009-002, Regarding Potential for Residual Heat Removal Trains to Be Inoperable During Mode Change ‎ (← links)
  • 05000400/LER-2009-001, Regarding Emergency Bus 1A-SA Undervoltage Relay as Found Dropout Voltage Did Not Meet TS Allowable Values ‎ (← links)
  • 05000400/LER-2008-003, Manual Actuation of the Reactor Protection System During Shutdown Rod Position Indication Surveillance Testing ‎ (← links)
  • 05000400/LER-2008-002, Manual Actuation of the Reactor Protection System Due to Main Condenser Exhaust Boot Failure ‎ (← links)
  • 05000400/LER-2008-001, Regarding Containment Spray Additive System Eductor Test Flow Outside of Technical Specification Limits ‎ (← links)
  • 05000400/LER-2007-005, B Train of Essential Services Chilled Water Was Inoperable for a Period Longer than Allowed by Technical Specifications ‎ (← links)
  • 05000400/LER-2007-003, Automatic Reactor Trip Following Actuation of a Sudden Pressure Relay and Lockout of the 1A Startup Transformer (SUT) ‎ (← links)
  • 05000400/LER-2007-002, Control Rod Shutdown Bank Anomaly Causes Entry Into Technical Specification 3.0.3 ‎ (← links)
  • 05000400/LER-2007-001, Regarding Control Rod Shutdown Bank Anomaly Causes Entry Into Technical Specification 3.0.3 ‎ (← links)
  • 05000400/LER-2006-003, Re Automatic Reactor Trip Due to Generator Lockout Signal ‎ (← links)
  • 05000400/LER-2005-004, Email to B. Mozafari from Harris Nuclear Plant Correcting LER 2005-04-00 to Licensee Event Report 2006-00-00 ‎ (← links)
  • 05000400/LER-2006-002, Re Escw Inoperable for a Period Longer than Allowed by Technical Specifications Due to Inadequate Procedure ‎ (← links)
  • 05000400/LER-2006-001, Re Multiple Turbine EHC Low Fluid Pressure Switches Inoperable Due to a Common Cause ‎ (← links)
  • 05000400/LER-2005-003, Regarding Equipment Drain System Isolation Valve Inoperable Longer than Its Allowed Outage Time ‎ (← links)
  • 05000400/LER-2005-002, Regarding Manual Reactor Trip Following a Trip of the B Condensate Pump Motor ‎ (← links)
  • 05000400/LER-2005-001, Regarding Reactor Auxiliary Building Emergency Exhaust System Single Failure Vulnerability ‎ (← links)
  • 05000400/LER-2004-006, Regarding Manual Actuation of Auxiliary Feedwater Pump ‎ (← links)
  • 05000400/LER-2004-005, Re Unplanned Start of a Emergency Diesel Generator ‎ (← links)
  • 05000400/LER-2004-004, Regarding Unanalyzed Condition Due to Inadequate Separation of Associated Circuits ‎ (← links)
  • 05000400/LER-2004-003, Unit 1 Automatic Reactor Trip Due to Rod Control Card Failure ‎ (← links)
  • 05000400/LER-2004-002, Regarding Containment Fan Cooler (AH-1) Inoperable ‎ (← links)
  • 05000400/LER-2004-001, Re Inoperability of the a Containment Hydrogen Analyzer ‎ (← links)
  • 05000400/LER-2003-006, Regarding Main Control Room Emergency Filtration System Degradation ‎ (← links)
  • 05000400/LER-2003-005, Manual Reactor Trip Following a Trip of the a Condensate Pump Motor ‎ (← links)
  • 05000400/LER-2003-004, Regarding Auxiliary Feedwater Actuation Following Closure of the Reactor Trip Breakers ‎ (← links)
  • 05000400/LER-2003-003, For Shearon Harris, Unit 1, Regarding Manual Reactor Trip Due to Loss of B Main Feedwater Pump ‎ (← links)
  • 05000400/LER-2003-002, Re Manual Reactor Trip Due to Trip of a Condensate Booster Pump ‎ (← links)
  • 05000400/LER-2003-001, Turbine Trip - Reactor Trip ‎ (← links)
  • 05000400/LER-2002-004-01, Unanalyzed Condition Due to Inadequate Separation of Associated Circuits ‎ (← links)
  • 05000400/LER-2002-003, Reactor Trip Due to Momentary Grid Undervoltage on August 15, 2002 ‎ (← links)
  • 05000400/LER-2002-002, Manual Reactor Trip Due to Turbine Digital Electro-Hydraulic Control System Malfunction ‎ (← links)
  • 05000400/LER-2002-001, Re Reactor Trip Due to Main Feedwater Regulating Valve Bypass Valve Failure ‎ (← links)
  • 05000400/LER-2001-004, Re Reactor Coolant Loops Made 4 Technical Specification Violation ‎ (← links)
  • 05000400/LER-2022-006-01, Auxiliary Feedwater Pump Inoperability ‎ (← links)
  • IR 05000400/2024004 ‎ (← links)