Pages that link to "05000458/LER-2006-001, Unanalyzed Condition Regarding RCIC Availability in Post-Fire Safe Shutdown Scenario"
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The following pages link to 05000458/LER-2006-001, Unanalyzed Condition Regarding RCIC Availability in Post-Fire Safe Shutdown Scenario:
Displayed 8 items.
- 05000458/LER-2006-001 (redirect page) (← links)
- 05000458/LER-2015-002, Operations Prohibited by Technical Specifications Due to Deficient Local Leak Rate Test Procedures Containing Erroneous Valve Alignments (← links)
- 05000458/LER-2015-001, Operations Prohibited by Technical Specifications Due to Deficient Local Leak Rate Test Procedures Containing Erroneous Valve Alignments (← links)
- 05000458/LER-2015-003, Operations Prohibited by Technical Specifications and Loss of Safety Function Due to Inoperability of Division 2 Containment Penetration Leakage Control System (← links)
- 05000458/LER-2014-004 (← links)
- 05000458/LER-2014-005 (← links)
- 05000458/LER-2001-004 (← links)
- 05000458/LER-2001-003 (← links)
- 05000458/LER-2001-002 (← links)
- 05000458/LER-2001-001 (← links)
- 05000458/LER-2017-008 (← links)
- 05000458/LER-1993-003, Notifies Staff Implementation of Updated Work Control Program Delayed Until 931031 Re Response to Insp Rept 50-458/93-11 & LER 93-003 (← links)
- 05000458/LER-1993-006, Provides Addl Info Re Failure of MSIV to Close Re LER 93-006.Atwood & Morrill Has Participated in Corrective Actions by Designing & Mfg 8 MSIV Mod Kits to Be Installed by Util (← links)
- 05000458/LER-1997-004, LAR 98-08 to License NPF-47,changing Specific Gravity Acceptance Criteria for Div III Battery,Re TS 3.8.6, Battery Cell Parameters. Condition Leading to Change Was Described in LER 97-004 & Insp Rept 50-458/97-13 (← links)
- 05000458/LER-1986-009, Corrected LER 86-009-00:on 860114,radwaste Liquid Effluent Monitor Sample Pump Not Started During Radioactive Liquid Discharge.Caused by Miscommunication & Procedure Ambiguities.Procedures Revised (← links)
- 05000458/LER-1985-062, Corrected Ltr Forwarding LER 85-062-00.Tracking Number Changed to RBG-23042 (← links)
- 05000458/LER-1985-061, Corrected Ltr Forwarding LER 85-061-00.Tracking Number Changed to RBG-23041 (← links)
- 05000458/LER-1999-003, Forwards LER 99-003-00,per 10CFR50.73.Commitments Identified in Rept Are Noted in Attachment 1 (← links)
- 05000458/LER-1986-060, Forwards Info Re Items Identified Subsequent to 861110 Conference Re Insp Rept 50-458/86-36.Addl Info Available in LER 86-60,submitted on 861113 (← links)
- 05000458/LER-1998-004, Forwards LER 98-004-00 Addressing Failure to Properly Implement Station Surveillance Test Program.Rept Being Submitted for Industry Review of Generic Applicability (← links)
- 05000458/LER-2023-005-01, Manual Reactor Scram Due to Lowering Feedwater Temperature Following an Automatic Isolation of Feedwater Heater String (← links)
- 05000458/LER-2023-006, Automatic Reactor Scram Due to a Turbine Trip Following a Disconnect Failure at Switchyard (← links)
- 05000458/LER-2023-005, Manual Reactor Scram Due to Lowering Feedwater Temperature Following an Automatic Isolation of Feedwater Heater String (← links)
- 05000458/LER-2023-004, Drywall Post Accident Radiation Monitor Inoperable Due to Unrecognized Surveillance Failure (← links)
- 05000458/LER-2022-004-01, High Pressure Core Spray Inoperable Due to Transformer Failure (← links)
- 05000458/LER-2023-003-01, Drywell Atmosphere Radiation Monitor Particulate and Gaseous Channels Inoperable Due to Out of Tolerance Conversion Factors (← links)
- 05000458/LER-2023-003, Drywell Atmosphere Radiation Monitor Particulate and Gaseous Channels Inoperable Due to Out of Tolerance Conversion Factors (← links)
- 05000458/LER-2023-002-01, Division I and II Diesel Generators Inoperable Due to Exceeding Load Sequence Times (← links)
- 05000458/LER-2023-001-01, Ultimate Heat Sink Inoperable Due to Boundary Valve Leakage (← links)
- 05000458/LER-2023-002, Division I and II Diesel Generators Inoperable Due to Exceeding Load Sequence Times (← links)
- 05000458/LER-2023-001, Ultimate Heat Sink Inoperable Due to Boundary Valve Leakage (← links)
- 05000458/LER-2022-004, High Pressure Core Spray Inoperable Due to Transformer Failure (← links)
- 05000458/LER-2022-003, Division 1 Standby Diesel Generator Speed Sensor Power Supply Failure (← links)
- 05000458/LER-2022-002, Condition Prohibited by Technical Specifications Due to Reactor Scram and Turbine Trip Level 8 Trip Setpoint Deviation (← links)
- 05000458/LER-2022-001, Condition Prohibited by Technical Specifications Due to Residual Heat Removal B Pump Motor Bearing Oil Leak (← links)
- 05000458/LER-2021-005, Potential Loss of Safety Function Due to Inoperable Reactor Core Isolation Cooling Steam Flow Transmitter (← links)
- 05000458/LER-2021-004, Core Monitoring System Software Modeling Error Resulted in Conditions Prohibited by Technical Specifications (← links)
- 05000458/LER-2021-003, Condition Prohibited by Technical Specifications Due to Failure to Perform Breaker Functional Test (← links)
- 05000458/LER-2021-002, Automatic Reactor Scram Due to Turbine Control System Communication Fault (← links)
- 05000458/LER-2021-001, Manual Reactor Scram Due to Loss of Main Condenser Vacuum (← links)
- 05000458/LER-2020-004, Inadvertent Initiation and Injection of High Pressure Core Spray (HPCS) (← links)
- 05000458/LER-2020-003, Weep Holes Discovered in G-Tunnel Wall Result in Inoperable Safety Related Equipment (← links)
- 05000458/LER-2020-002, Manual Reactor Scram Due to Reactor Recirculation Pump Trip (← links)
- 05000458/LER-1989-032, :on 890907,unplanned ESF Actuation Occurred During Surveillance Test Procedure STP-207-4536.Caused by Technician Failure to Properly Lift Lead.Trip Signal Reset, Sys Restored & Procedure Completed (← links)
- 05000458/LER-1998-002-02, :on 980425,each of Two Trains of Annulus Mixing Sys Failed to Start During Testing Due to Different, Apparently Independent Causes.Eoi Personnel Performing Root Cause Analyses.Breaker Replaced (← links)
- 05000458/LER-1998-001-04, :on 980417,flow Rate Through SBGTS Filter Assembly Units Was Found to Be Higher than Design Flow Rate. Cause Analysis Is Currently Being Performed.Detailed Evaluation of Sys Ability to Perform Was Done (← links)
- 05000458/LER-1989-022, :on 890502,potential Inability of safety-related Air Dryer Outlet Isolation Valves to Perform Required Isolation Function Identified.Caused by Engineering Design Oversight.Maint Work Orders Issued (← links)
- 05000458/LER-1989-008, :on 890225,reactor Automatically Scrammed While Performing Upper Thrust Bearing Wear Detector Test & RCIC Sys Injected Due to Spurious Low Reactor Water Level Signal. Turbine Bypass Switch Will Be Installed (← links)
- 05000458/LER-1988-011, :on 880503,containment Isolation Valve Discovered to Be Inoperable for Time Greater than Allowed by Tech Specs.Caused by Torque Arm Key Fallen Out of Keyway. Valve Repaired & Personnel Instructed (← links)
- 05000458/LER-1989-020, :on 890419,freeze Plug on Standby Svc Water Line in Auxiliary Bldg Failed Resulting in Leakage of Svc Water & Selective Power Outage.Caused by Procedural Inadequacy.Personnel Secured Sys for Leak (← links)
- 05000458/LER-1989-031, :on 890624,util Discovered Surveillance Test Procedure 509-0101 Not Performed Before Exceeding 25% Power. Caused by Interpretational Mistake by Control Operating Foreman.Foreman Counseled (← links)
- 05000458/LER-1989-021, :on 890427,during Refueling,Unplanned ESF Actuation Occurred.Caused by Power Transient to Several Trip Cards Resulting from Shorting of Test Connection.Rhr Shutdown Cooling Restored & Actuation Reset (← links)
- 05000458/LER-1989-011, :on 890321,leak Rate Test Results of Each Penetration Was in Excess of 2.4 Std Cubic Ft Per Minute. Caused by Corrosion Products Preventing Full Closure of Valves.Maint Work Orders Issued (← links)
- 05000458/LER-1988-024, :on 881027,ESF Actuation Occurred Resulting in Isolation of RWCU Sys.Caused by Cross Tripping Phenomenon of Temp Switches & Procedural Error.Changes Made to Surveillance Test Procedures (← links)
- 05000458/LER-1986-051, :on 860810,RWCU Occurred When Daily Surveillance on Leak Detection Temp Modules Conducted.Caused by Personnel Negligence.Permanent Caution Plaque Mounted Near Read-Set Switches (← links)
- 05000458/LER-1989-030, :on 890617,pressure Transmitter Root Valve for Penetration Valve Leakage Control Sys Found Closed.Caused by Personnel Error & Misapplication of Test Tagging Procedure. Root Valve Opened & Control Sys Restored (← links)
- 05000458/LER-1989-019, :on 890411,unplanned ESF Actuation Occurred as Result of Blown Control Power Fuse During Surveillance Testing of Control Circuit.Cause Not Determined.Blown Fuse Replaced & Actuated Sys Restored to Normal (← links)
- 05000458/LER-1989-007, :on 890220,reactor Scram Occurred Due to Intermediate Range Monitor (IRM) Upscale Trip.Irm Upscale Trip Caused by Induced Positive Reactivity.Procedure GOP-001 Revised (← links)
- 05000458/LER-1989-010, :on 890318,unsealed Penetration Discovered in Control Bldg Fire Wall on 116 Ft Elevation Making Barrier Inoperable.Existing Hourly Fire Watch Patrols for Conditions Added to Limiting Condition for Operation (← links)
- 05000458/LER-1989-017, :on 890407,determined That intermediate-range Monitor Surveillance Test Procedures Not Performed within Allowable Tech Spec Schedule Tolerance.Caused by Scheduling Error.Manual Changes Will Be Verified (← links)
- 05000458/LER-1989-016, :on 890407,ESF Actuation Occurred When Containment & Drywell Equipment Drain Inboard Isolation Valves Isolated.Caused by Interrupting Ac Daisy Chain Neutral.Valves Reopened (← links)
- 05000458/LER-1989-018, :on 890407,isolation of Div 2 Containment Ventilation Sys Occurred,Causing Tripping of Unit Fan Cooler & Isolation of Chilled Water Supply Valves.Caused by Operator Error.Venting Procedures Revised (← links)
- 05000458/LER-1989-029, :on 890613,unplanned ESF Actuation Occurred as Result of Technicians Shorting Two Leads Together While Installing Spare Transformer.Caused by Personnel Error. Communications Improved (← links)
- 05000458/LER-1989-028, :on 890512,particulate Channel of Fuel Bldg Exhaust Radiation Monitor Spiked Resulting in Automatic Initiation of Fuel Bldg Filter Trains.Caused by Degraded Voltage Conditions Due to Electrical Outage (← links)
- 05000458/LER-1989-014, :on 890405,operator Inadvertently Initiated Standby Svc Water Sys During Svc Water Vacuum Release Valve Testing,Causing CRD Pump to Trip.Caused by Operator Error. Operator Reinstructed Re Board Manipulations (← links)
- 05000458/LER-1989-026, :on 890512,determined That Three safety-related Motor Operated Valves Operated Outside Design Basis.Caused by Size & Location of Restricting Orifices.Orifices Resized & Relocated (← links)
- 05000458/LER-1989-027, :on 890528,automatic Initiation of Standby Svc Water Pump Occurred During Surveillance Test Procedure. Caused by in-process Surveillance Test Deenergizing Div III 480/120 Volt Ac Bus.Procedure Revised (← links)
- 05000458/LER-1989-012, :on 890325,ESF Isolation Occurred for RWCU Main Steamline Drains & RHR Shutdown Cooling Sys.Caused by Loss of Power to Div II Isolation Logic When Breaker Opened. Breaker Reclosed (← links)
- 05000458/LER-1989-024, :on 890406,observed That Six Solenoid Operated Valves Oriented to Isolate Normal Air Flow Into safety- Related Instrument Air Sys Accumulator.Caused by Subj Valve Not Properly Oriented.Valve Reoriented (← links)
- 05000458/LER-1989-015, :on 890329,jumper That Had Inadvertently Fallen Off Terminal Incorrectly Replaced by Technician Causing Fuse to Blow.Caused by Technician Error.Fuse Replaced.Technicians Will Receive Training on Event (← links)
- 05000458/LER-1989-013, :on 890324,determined Effects Not Considered in Calibr Basis for Reactor Water Level Instrumentation.Caused by Water Level Measurement Error.Analytical Limits Will Be Adjusted Downward by 890630 (← links)
- 05000458/LER-1989-009, :on 890316,noticed That Structural Ribs Reinforcing for 1 H Rated Thermo-Lag Covering on Div 2 Conduits,Cable Trays & Supports Removed.Caused by Deficiency in Vendor Installation & QC Program (← links)
- 05000458/LER-1989-025, :on 890516,determined That Incorrect Baseline Calculation Used in Verification of Tech Spec Required Vol Fuel Oil Day Tanks.Caused by Design Calculation Error. Immediate Verification of Fuel Oil Level Made (← links)
- 05000458/LER-1989-001, :on 890108,ESF Actuation Occurred When Reactor Water Sample Containment Isolation Valve Automatically Isolated.Caused by Blown Fuse,Deenergizing Isolation Logic. Fuse Replaced & Isolation Reset (← links)
- 05000458/LER-1989-023, :on 890507,unplanned ESF Actuation Occurred. Caused by Lifted Wire Inadvertently Making Contact with Energized Terminal Point Causing Relay to Energize.Loads Reset & Personnel Briefed (← links)
- 05000458/LER-1986-005, :on 860107,fire Protection Water Curtain Inadvertently Actuated Overloading Floor Drian Sys.Caused by Const Employee Mistaking Solenoid Actuation Switch for Door Latch.Switch Properly labeled.W/870909 1tr (← links)
- 05000458/LER-1987-017, :on 870811,discovered RCIC Leak Detection Sys Isolation Logic Inoperative Due to Mispositioned Valve.Cause Undetermined.Valve Lineup Check Revealed No Other Mispositioned Valves (← links)
- 05000458/LER-1987-031, :on 871128,during Performance of Surveillance Test Procedure,Initiation of Standby Svc Water Sys Occurred. Caused by Procedural Inadequacies.Procedure Corrected Via Temporary Change Notice (← links)
- 05000458/LER-1987-016, :on 870805,auto Starts of Annulus Mixing & Standby Gas Treatment Sys Occurred.Caused by Electrical Anomaly Due to Lightning Strike.Sys Returned to Normal (← links)
- 05000458/LER-1985-032, :on 851103,fuel Bldg HVAC Normal Supply & Exhaust Sys Isolated & Div I ESF Charcoal Filter Train Auto Started.Caused by Spurious Low Flow Signal Being Generated by Div I Flow Switch.Switch Recalibr (← links)
- 05000458/LER-1986-047, :on 860731 & 0802,feeder Breaker Tripped Causing Automatic Start of Both Divs of Annulus Mixing, Standby Gas Treatment & Fuel Bldg Ventilation Sys.Caused by Defective Protective Relay.Relay Replaced (← links)
- 05000458/LER-1987-029, :on 871119,fuse B21H-F76B Blew & Deenergized Control Logic Causing RHR Shutdown Cooling Suction Valve to Isolate & in Turn,Tripped RHR Pump A.Caused by Human Error. Fuse Replaced (← links)
- 05000458/LER-1987-030, :on 871118,failure to Perform Temp Monitoring on Reactor Plant Component Cooling Water Sys Areas,Per Tech Spec 3.7.8 Discovered.Investigation of Cause Inconclusive. Surveillance Test Procedures Revised (← links)
- 05000458/LER-1987-026, :on 871211,discovered That Surveillance for Two Fire Doors Missed.Caused by Doors Inadvertently Omitted from Surveillance Procedure Revised on 871013.Procedure Revised to Include Doors (← links)
- 05000458/LER-1987-009, :on 870602,low Pressure Core Spray Inoperable Due to Improper Transmitter Calibr.Caused by Nonincorporation of Head Correction.Trip Units Associated W/ Transmitters Adjusted (← links)
- 05000458/LER-1987-027, :on 871117,while Sys Valve line-ups Being Performed,Valve 1RCS-V122 Discovered Closed.Caused by Valve Not Being Signed Off as Opened During Initial Performance of Sys line-up in Aug 1985.Valve Repositioned (← links)
- 05000458/LER-1998-004-03, :on 980514,noted That Surveillance Test Had Not Been Completed for Primary Containment Leakage Rate Testing Program.Caused by Lack of Proper Emphasis on Procedure Step Re Summation.Revised Pertinent Surveillance Procedures (← links)
- 05000458/LER-1987-028, :on 871106,RHR Pump Tripped.Caused by High Differential Temp Condition Probably Due to Lack of Ventilation.Root Cause Undetermined.Rhr Pump Room Unit Cooler Returned to Svc (← links)
- 05000458/LER-1987-020, :on 860606 & 1129,post-maint Exercise Tests Missed on ASME Valves 1E21*AOVF006 & 1B21*AOVF032B, Respectively.Caused by ASME Valve Repair/Replacement Program Deficiencies.Plant Procedures Revised (← links)
- 05000458/LER-1987-023, :on 871019,cooling Water Lines to HX 1RMS*HX11A Serving Radiation Monitor 1RMS*RE11A Found Plugged Due to Corrosion Buildup.Caused by Condition of Svc Water Chemistry.Lines Cleaned or Replaced (← links)
- 05000458/LER-1998-003-02, :on 980624,adequacy of Division 1 & 2 DG Control Air Sys Was Noted.Root Cause Analysis Is Being performed.Multi-disciplinary Team Was Formed to Address Immediate & long-term Corrective Actions (← links)
- 05000458/LER-1987-025, :on 871021,while Performing Monthly Surveillance Test,Div II Diesel Generator Output Breaker Failed to Close.Cause Undetermined.Addl Clarifications & Precautions Added to Site Procedure (← links)
- 05000458/LER-1987-024, :on 871020,full Reactor Scram Signal Initiated on Reactor Protection Sys During Installation of Mod Request 85-0770.Caused by Communications Breakdown.Procedures for Work on Logic Channels Revised (← links)
- 05000458/LER-1986-024, :on 860325,ESF Actuations Occurred Due to Breaker Failure.On 861224,power to Reactor Protection Sys Bus B Lost Due to Spurious Breaker Trip Resulting in half- Scram.Caused by Malfunctioning Logic Card (← links)
- 05000458/LER-1998-002, :on 980425,failure of Two Trains of Annulus Mixing Was Noted.Caused by Problem W/Instantaneous Trip of Setpoint a & B Supply Breakers.Corrected Trip Settings & Replaced B Breaker (← links)
- 05000458/LER-1998-002-01, Forwards LER 98-002-01,IAW 10CFR50.73.Commitments Made within Ltr,Encl (← links)
- 05000458/LER-1987-022, :on 871016,during Performance of Surveillance Test Procedure,Isolation of RHR Sys Shutdown Cooling Supply Valve Occurred.Caused by Improperly Sequenced Steps in Procedure.Procedure Corrected (← links)
- 05000458/LER-1987-015, :on 870621,scram Initiation Occurred While Transferring Reactor Protection Sys Power.Caused by Intermediate Range Monitor Channel E Spike.Maint Work Request Generated to Investigate Problem (← links)
- 05000458/LER-1987-021, :on 871015,discovered That Fire Seal Not Installed in Spent Fuel Pool Cooling Pump Cubicle Wall. Caused by Contractor Unawareness of Openings.Maint Work Order Request Written to Seal Openings (← links)
- 05000458/LER-1987-014, :on 870707,MSIV 1B21*F028C Closed During Performance of Surveillance Test Procedure STP-051-4504 Resulting in Reactor Pressure & Power Transient.Caused by Procedural Inadequacy.Procedure Revised (← links)
- 05000458/LER-1986-068, :on 861223,RCIC High Steam Supply Flow Detection Transmitter Failed.Caused by Moisture Accumulating in Electronics Head.Transmitter Replaced & Sys Declared Operable on 861227 (← links)
- 05000458/LER-1987-019, :on 870930,discovered That Change Made to post- fuel-loading Intial Test Program Not Reported to Nrc.Startup Tests Reviewed.Conclusion That All Tests Performed Utilizing Proper Acceptance Criteria Made (← links)
- 05000458/LER-1998-001, :on 980417,flow Rate Through SGTS Filter Assembly Units Were Found to Be Higher than Design Flow Rate.Caused by Personnel Error.Reviewed & Updated Design & Licensing Basis Documents (← links)
- 05000458/LER-1998-001-01, Forwards LER 98-001-01 Re Elevated Flow Rates Through Standby Gas Treatment Sys Filter Assembly Units.Commitments Made within Ltr Are in Attachment 2 (← links)
- 05000458/LER-1989-005, :on 890214,void Identified in Fire Seal Penetration Located on Wall Separating Cable Chase I from Chiller Room on 98-ft Elevation of Control Bldg.Caused by Poor Insp Technique.Firewatch Posted (← links)
- 05000458/LER-1987-013, On 870629,discovered That Chemistry Technician Failed to Perform Required Surveillance,Per Tech Spec 4.11.2.1.2 Following Unit Shutdown.Caused by Technician Error.Vol on Gaitronics Sys Increased (← links)
- 05000458/LER-1989-006, :on 890217,reactor Protection Sys Actuation Due to Signals from Intermediate Range Monitor.Caused by Personnel Error.Operator Counseled & Procedures Reviewed (← links)
- 05000458/LER-1989-003, :on 890205,discovered That Surveillance Requirements for Ac Circuits Inside Containment Not Properly Performed for All Circuits.Caused by Inadequate Procedure Development.Test Procedure Revised (← links)
- 05000458/LER-1986-052, :on 860822,main Control Room Ventilation Sys Isolation Occurred.Caused by Induced Signal on Radiation Monitor Due to Maint Work.Noise Suppression Will Be Installed on Preamplifier Power Lines (← links)
- 05000458/LER-1986-021, :on 860301,unit Automatically Scrammed on Low Reactor Water Level.Caused by Transformer Fault & Voltage Transient.Mods to Transformer Encls at Cooling Towers Implemented to Add Addl Walls & Covers (← links)
- 05000458/LER-1989-004, :on 890210,ESF Actuation Occurred When Instrumentation & Controls Technician Incorrectly Took Voltage Reading on Instrument Trip Unit.Caused by Personnel Error.Technician Received Counseling (← links)
- 05000458/LER-1986-062, :on 861028,automatic Initiation of Div I Standby Gas Treatment Sys & Annulus Mixing Fan Occurred. Caused by Radiation Monitor Susceptability to Electrical Noise.Corrective Action Under Investigation (← links)
- 05000458/LER-1989-002, :on 890112,isolation of RWCU Due to Temp Spike from Thermocouple Servicing Temp Trip Unit 1E31-N6220B Occurred,Caused by Malfunction of Shutoff Adapter Allowing Formation of Steam Plume.Esf Sys Performed (← links)
- 05000458/LER-1987-011, :on 870610,Div 1 RCIC Sys Isolation Occurred. Caused by Low Level in Ref Leg for Transmitter 1E31*N084.Ref Leg Refilled & Transmitter Calibr Checked.Mod Request Initiated to Rework Routing of Ref Leg Lines (← links)
- 05000458/LER-1987-018, :on 870901,discovered That Two Chemical Properties of Diesel Fuel Oil Shipment to Plant Did Not Meet Acceptable Criteria,Per Tech Specs.Fuel Oil Analysis Entered Into Surveillance Test Procedure Program (← links)
- 05000458/LER-1987-010, :on 870609,RWCU Sys Isolation Occurred Due to High Temp Isolation Signal from RWCU HX Room Leak Detection Sys.Caused by Two Regenerative HX Pressure Relief Valves. Valves Replaced & Isolation Signal Reset (← links)
- 05000458/LER-1997-004-02, :on 970724,inadequate Surveillance of Division III Battery Occurred Due to Calculation Error.Performed Revised Division III Battery Svc Discharge Test Procedure Using Correct Battery Profile (← links)
- 05000458/LER-1987-006, :on 870313,electrical Cables Found Exposed to Conditions Such as Tornadoes & Tornado Generated Missiles. Caused by Design Oversight During Initial Routing of Cables. Effort Initiated to Install Missile Shields (← links)
- 05000458/LER-1986-055, :on 860831,reactor Scrammed Due to Loss of Reactor Protection Sys Bus a Concurrent W/Failure of Sys Backup Scram Circuitry B.Caused by Failure of Cooling Tower Feeder Transformer.Mod Request Generated (← links)
- 05000458/LER-1986-046, :on 860611,while Routine Filter & Cartridge Replacement on Monitors performed,wide-range Gas Monitor Found Turned Off.Caused by Min Number of Channels Not Operable.Condition Rept 86-0726 Written (← links)
- 05000458/LER-1986-064, :on 861031,grounded Metal Isolation Can Inadvertently Brought Into Contact w/24-volt Dc Power Iodine Cooling Fins of Power Supply B21K613B,resulting in Stated Trips.Caused by Personnel Error (← links)
- 05000458/LER-1986-063, :on 861028,unanticipated Isolation Signal Received for RHR During Surveillance Test,Due to Grounded Lead.Caused by Test Procedure Requiring Wiring Termination Activities in Confined Space.Procedure Revised (← links)
- 05000458/LER-1986-061, :on 861020,cooling Tower Blowdown Radiation Monitor 1RMS-RE108 Experienced Loss of Sample Flow & on 861022,discovered That Grab Samples Required to Be Collected Every 12 H Had Not Been Taken.Test Performed (← links)
- 05000458/LER-1986-044, :on 860807,reactor Trip Occurred as Result of Turbine Bldg High Temp Isolation Trip Signal.Caused by Failure of Main Steam Moisture Separator Reheater Drain Tank Gasket.Gasket Replaced (← links)
- 05000458/LER-1987-007, :on 870418,discovered That Shield Bldg Annulus Pressure Greater than 3 Inches of Vacuum Water Gauge,In Violation of Tech Specs.Caused by Pressure Drop in Sys a & B.Operator Reminded to Monitor Pressure (← links)
- 05000458/LER-1986-054, :on 861005,discovered That on 860921,HPCS Administrative Operability Overlooked.Caused by Inability to Automatically Isolate Injection Path on High Reactor Water Level,Per Tech Spec 3.3.3 (← links)
- 05000458/LER-1986-069, :on 861226,turbine Runback Led to Reactor Scam. Caused by Sticky Valve Positioner.Temp Switch Recalibr.W/ . W/8 Ltr (← links)
- 05000458/LER-1986-013, :on 860127,main Steam Line Area Temp Detector 1LDS*RTD4C Failed Channel Check & Declared Inoperable. Caused by Procedure Incorrectly Reflecting Tech Spec Requirements.Procedure Revised (← links)
- 05000458/LER-1997-007-02, :on 970926,discovered Cracked EDG Valve Adjusting Screw Assembly Swivel Pads (Vasasps).Caused by Mfg Defect.Replaced Vasasps in EDGs W/New Components & Returned Defective Vasasps to Vendor for Analysis (← links)
- 05000458/LER-1997-002, :on 970506,through-wall Crack in Weld on RRS Vent Valve Was Noted.Caused by Low Stress,High Cycle Fatigue Induced by Vibration.Valve Replaced Prior to Returning to Power Operations (← links)
- 05000458/LER-1986-066, :on 861124,discovered That Two Rated Fire Doors Omitted from Any Surveillance Test Procedure (STP) Door List.Caused by Procedural Deficiency.Temporary Change Notice Written to Include Two Doors in Daily STP (← links)
- 05000458/LER-1986-065, :on 861114,past Interpretation of Leakage Requirements for MSIV Found Incorrect.Memo Issued to Delineate Original Intent of Tech Spec Requirement & Associated Surveillance Procedures Revised (← links)
- 05000458/LER-1986-041, :on 860614,turbine Tripped on High Vibration at Control Valve 1 Bearing.Caused by Momentary Rise in Vibration.Test Procedure Changed to Bypass High Vibration Trip Function During Valve Testing (← links)
- 05000458/LER-1986-014-01, :on 860128,inadvertent Div 1 Diesel Generator & Standby Gas Treatment Sys Initiation Occurred.Caused by Interruption of Neutral Daisy Chain.Maint Procedure GMP-0042 Revised (← links)
- 05000458/LER-1986-058, :on 861006,during Breaker alignment,1NPS-ACB23 Mistakenly Opened Instead of 1NPS-ACB33,causing 1NNS-SWG2B to Deenergize Which Caused Svc Water Pump 1B to Trip.Caused by Operator Error.All Personnel Counseled (← links)
- 05000458/LER-1986-057, :on 860923,during Surveillance Test Procedure STP-207-4210,RCWU Sys Isolated.Caused by Inadvertent Grounding of Electrical Jumper Resulting in Blown Fuse.Fuse Replaced.Rcwu Isolation Reset (← links)
- 05000458/LER-1987-003, :on 870116,reactor Scram Occurred Due to High Reactor Water Level.Caused by Feedwater Level Transient While Placing Feedwater Regulating Valve a Into Svc.Operator Involved Counseled & Crews Reviewed Occurrence (← links)
- 05000458/LER-1986-037, :on 860505,high Reactor Pressure Scram Occurred Due to Turbine Runback Stator Coolant Trouble Alarm.Caused by Low High Stator Water Cooling Temp Setpoint.Temp Switches Recalibr (← links)
- 05000458/LER-1997-005-02, :on 970822,reactor Scram Occurred Due to Failure of Connector to Electrical Trip Solenoid Valve. Replaced Shorted Connector Prior to Plant start-up (← links)
- 05000458/LER-1987-002, :on 870112,reactor Shutdown Initiated for Unidentified Drywell Leakage Exceeding 5 Gpm.Caused by Packing Leaks on Several Valves W/Rhr B Testable Injection Check Valve as Primary Contributer (← links)
- 05000458/LER-1986-056, :on 860902,reactor Scrammed on RCIC Initiation. Caused by Entrapped Air in Instrument Sensing Line Following Maint.Air Vented from Instrumentation & Loose Transmitter Connection Reworked & Corrected (← links)
- 05000458/LER-1986-036, :on 860501,Condition Rept CR 86-0539 Initiated, Indicating 31 One Shot Internal Conduit Seals Improperly Located.Walkdown Initiated.Conduit Seals Found in Noncompliance Repaired W/Second Seal (← links)
- 05000458/LER-1997-003-05, :on 970722,high Pressure Core Spray Pump Breaker Trip Occurred During Testing.Caused by Failure of a Phase Time Overcurrent Relay.Replaced Failed Relay & Adjusted Contacts on 51-A Relay (← links)
- 05000458/LER-1999-002, :on 990204,discovered Unanalyzed Air Filters on Containment Unit Coolers.Caused by Station Personnel Error. Root Cause Analysis Will Be Reviewed by Selected Personnel (← links)
- 05000458/LER-1999-002-01, Forwards LER 99-002-01,IAW 10CFR50.73.Supplemental Rept Details Root Cause Analysis for Reported Condition. Commitments in Document Annotated on Commitment Identifier Form,Attachment 1 (← links)
- 05000458/LER-1986-048, :on 860804,discovered That Daily Surveillance Test STP-500-4550 Re Control Sys High & Low Power Setpoint, Not Performed Since 860802.Control Rods Also Pulled.Caused by Poor Scheduling.Schedule to Be Distributed (← links)
- 05000458/LER-1985-010, :on 850930,explosive Valve Failed to Fire When Train a of Standby Liquid Control Sys Initiated.Caused by Incorrectly Wired Terminations in Termination Panel. Terminations Corrected (← links)
- 05000458/LER-1999-006, :on 990406,automatic Initiation of Div 1 Ssws Occurred During Performance of Surveillance Testing.Caused by Procedural Inadequacy.Procedures Were Reviewed & Needs Analysis Will Be Performed.With (← links)
- 05000458/LER-1986-067, :on 861210,while Performing RCIC Pump Operability Test,Div I Isolation of Rcic/Rhr Steam Supply Line Occurred.Caused by Water Column Forming Inside Sensing Line.Instrument Loop Trip Setpoints Lowered (← links)
- 05000458/LER-1999-002-02, :on 990204,discovered That Potentially Rendered safety-related Unit Coolers in Primary Containment Inoperable.Cause Being Investigated.Corrective Action Plan Will Be Submitted in Suppl to Ler.With (← links)
- 05000458/LER-1988-014, :on 880711,inadvertent Initiation of Train B of Annulus Mixing Sys & Standby Gas Treatment Sys Occurred Due to Stuck Check Source in Particulate Radiation Monitor. Cause Not Determined.Work Order Initiated (← links)
- 05000458/LER-1988-015, :on 880713,inadvertent auto-start of Fuel Bldg Charcoal Filtration Sys Occurred.Caused by Maint Error.All Instrument & Control Technicians Received Training on Event (← links)
- 05000458/LER-1999-007, :on 990410,inadvertent Containment Isolation Valve Closure Occurred Due to Tagging Deficiency.Caused by Less than Adequate Work Practices.Plant Was Shutdown for Scheduled RFO & Subject Valves Shifted to Closed Position (← links)
- 05000458/LER-1999-005, :on 990228,noted That Standby Swp Was Inoperable for Greater than 30 Days.Caused by Mechanical Failure of Breaker.Breaker E22-S004 ACB-05 Was Replaced with Like,Operable Breaker & Standby Swp Was Declared Operable (← links)
- 05000458/LER-1986-034, :on 860516,fuel Bldg Exhaust Radiation Monitor Failed,Initiating Fuel Bldg Filtration Sys Train B.Caused by Mechanical Failure of Monitor.Check Source Lever Arm Properly Positioned & Screw Tightened (← links)
- 05000458/LER-1999-003-03, :on 990324,Division I DG Was Declared Inoperable.Caused by Inadequate Assembly of Fuel Pump.Fuel Pump Coupling Was Repaired & DG Was Returned to Svc (← links)
- 05000458/LER-1999-004, :on 990325,automatic Actuation of CIV Due to Inadvertent Water Movement Was Noted.Caused by Failure to Coordinate Separate Activities of Different Workers.Dryer Pool Was Returned to Normal Level.With (← links)
- 05000458/LER-1986-032, :on 860423,reactor Scrammed on Water Level 8. Caused by Fouled Connector Pins on Circuit Board Card of Master Controller,Resulting in Erroneous Indication of Automatic Mode.Controller Contacts Cleaned (← links)
- 05000458/LER-1987-005, :on 870223,condition Rept Initiated Re Several Fire Barriers W/Minor Cracks & Wear Conditions.Caused by Deficiency in Vendor Installation & QC Insp Program (← links)
- 05000458/LER-1986-025, :on 860326,RHR Sys Isolation Occurred.Caused by Inadvertent Shorting of Bypass Jumper to Adjacent Test Lead During Performance of Surveillance Test Procedure.Sys Returned to Svc (← links)
- 05000458/LER-1997-010, :on 971111,high Pressure Core Spray Minimum Flow Valve Discovered to Be in Closed Position Due to Air in Transmitter Sensing Lines.Hpcs Pump Was Run & No Abnormalities Were Noted (← links)
- 05000458/LER-1997-010-01, :on 971111,high Pressure Core Spray Minimum Flow Valve Was Discovered in Closed Position.Caused by Air in Transmitter Sensing Lines.Sensing Lines from HPCS Pipe to Flow Transmitter Vented at High Point Vents to Remove Air (← links)
- 05000458/LER-1986-022, :on 860312,w/unit at 42% Reactor Power,Full Reactor Scram Occurred.Caused by Pressure Spike in Instrument Line.Station Operating Procedure SOP-0011 Revised (← links)
- 05000458/LER-1997-009-01, :on 971016,inadequate Pressure Test Performance Was Noted.Caused by Inappropriate Testing Lineups.Llrt Valves,Were Retested Utilizing Revised Test Configurations (← links)
- 05000458/LER-1997-008-02, :on 971004,inadvertent Closure of RHR Shutdown Cooling Inboard Isolation Valve Occurred.Caused by Inadequate Administrative Controls,Supervision & Work Practices.Procedures Revised (← links)
- 05000458/LER-1986-035, :on 860501,reactor Scram Occurred,Resulting in APRM Flow Biased Thermal Trip.Caused by Increased Noise Level on Transmitter a Due to Transmitter B Removed from Svc.Aprm Transmitters Dampened (← links)
- 05000458/LER-1997-006-01, :on 970913,unplanned Mode Change During Initial Test of New Alternate Decay Heat Removal Function Occurred. Caused by Failure to Ref & Use Time-to-Boil Curves. Procedures Revised (← links)
- 05000458/LER-1986-031, :on 860418,required Hourly Fire Watch Patrol for Five Inoperative Fire Barriers Inadvertently Cancelled. Caused by Personnel Error & Procedural Deficiency.Control Operating Foreman Counseled (← links)
- 05000458/LER-1986-033, :on 860426,reactor Scrammed Due to Combination of Planned half-scram from Surveillance Test & Unplanned half-scram.Caused by Blown Fuse in Reactor Protection Sys. Fuse Replaced (← links)
- 05000458/LER-1985-012, :on 851003,potential for Loss of Power to Transfer Circuitry for Remote Shutdown Capability & Apparent Excessive Voltage Drop in Control Circuitry Existed W/Div 1 Standby Switchgear.Transfer Relays Replaced (← links)
- 05000458/LER-1985-009, :on 850926,reactor Water Cleanup Containment Isolation Initiated When Temp Reading Obtained from Leak Detection Differential Temp Switch.Caused by Flaw in Switch Design.Mfg Mod to Circuitry Recommended (← links)
- 05000458/LER-1986-029, :on 860405,standby Svc Water Sys Experienced Inadvertent Start.Caused by Electrical Transient.Standby Svc Water Pump Secured (← links)
- 05000458/LER-1985-041, :on 851121,during Startup,Reactor Feedwater Pump (RFP) Tripped.Caused by Main Oil Pump Trip on Overload Due to RFP Discharge motor-operated Valve Torque Switch Set Too Low.Switch Settings Reset (← links)
- 05000458/LER-1986-027, :on 860403,reactor Protection Sys Actuation Occurred Due to Loss of Bus B Control Power.Caused by Blown Power Fuse in Elgar Rectifier.Mod of Internal Control Circuits Initiated (← links)
- 05000458/LER-1986-053, :on 860916,thermolag Matl Removed from Equipment Necessary for Safe Shutdown W/O Initiation of Fire Watch Per Tech Spec 3/4.7.7.Caused by Personnel Oversight. Personnel Counseled (← links)
- 05000458/LER-1999-008, :on 990418,uplanned Automatic Closure of Div III DG Output Breaker Was Noted Due to Loss of Normal Power to Div III Switchgear During Testing.Caused by Personnel Error.Returned Electrical Lineup to Normal.With (← links)
- 05000458/LER-1999-012, :on 990520,inadequate Surveillance Testing of DG Trip Functions,Was Discovered.Caused by Improper Implementation of Its.Comparison of Other DG Surveillance Requirements to Info in TS Bases Will Be Completed (← links)
- 05000458/LER-1988-002, :on 880110,full Scram Inadvertently Initiated Via Alternate Rod Insertion Trip Sys.Caused by Personnel Error Due to Misleading Surveillance Test Procedure Wording. Procedure Revised & Rerun (← links)
- 05000458/LER-1988-001, :on 880108,scram Discharge Vol Reactor Protection Sys Level Transmitter Discovered to Have Been Out of Tolerance for Approx 11 H.Caused by Operator Oversight. Channel Placed in Tripped Position (← links)
- 05000458/LER-1986-001, :on 860101,unit Scrammed from 19% Power on Low Reactor Water Level as Result of Isolations on Both Low Pressure Feedwater Heater Strings.Probably Caused by Flashing in Level Transmitter Pots (← links)
- 05000458/LER-1988-006, :on 880219,reactor Shutdown Required by TS Due to Reactor Recirculation Pump Motor Trip.Caused by Moisture Intrusion from Leaking Svc Water Valve.Leaking Valve Repaired & Termination Cabinet Cleaned & Dried (← links)
- 05000458/LER-1988-021, :on 880906,reactor Scram Occurred.Caused by Fault on Neutral Grounding Transformer Due to Stray Cat Shorting Out High Side of Transformer.Transformer Replaced & Protection of Terminations Under Investigation (← links)
- 05000458/LER-1987-033, :on 871211,loss of Div II Reactor Protection Sys Occurred Due to Trip of Electrical Protection Assembly Breaker CS71-S003D.Caused by Defective Breaker Logic Card. Integrated Circuit Chips Replaced (← links)
- 05000458/LER-1999-010, :on 990428,inadvertent Breach of Fuel Bldg Integrity Occurred.Caused by Failure to self-check. Administrative Control Was Instituted to Place Control of Door SH-113-01 Under on-shift Operations SS (← links)
- 05000458/LER-1999-011, :on 990510,initiation of Div I DG & ECCS Injection Into Rv Occurred.Caused by Failed,Unsealed Capacitor on Rosemount Trip Unit.Replaced Failed Trip Unit & Evaluated Methods to Reduce Consequences of Same Failures (← links)
- 05000458/LER-1988-023, :on 880930,reactor Shutdown Initiated After Inboard MSIV Found Inoperable During Testing,Per Info Notice 88-43.Caused by Gelling of Lubricant.Msiv fast-closure Solenoid Operated Valves Replaced (← links)
- 05000458/LER-1985-063, :on 851231,turbine Generator Trip Occurred on False Turbine Generator Power Load Imbalance.Caused by Pressure Transducer Failure to Scram & Lightning Strike on 500 Kv Transmission Line.Transducer Replaced (← links)
- 05000458/LER-1999-009, :on 990422,TS non-compliance Due to Inappropriate Action Statement Exit,Was Identified.Caused by Inadequate Written Communication.Restarted Div 2 Crfa Sys Filter Train in Emergency Mode Returning to Compliance (← links)
- 05000458/LER-1988-020, :on 880829,control Switches for Both Divs of Fuel Bldg Filtration Heaters Found in Deenergized Position. Caused by Personnel Error.Control Switch Restored to Energized Position (← links)
- 05000458/LER-1988-018, :on 880825,reactor Automatically Scrammed Due to Turbine Control Valve Fast Closure Caused by Loss of Main Generator Field Excitation Resulting in Automatic Main Generator & Turbine Trips (← links)
- 05000458/LER-1986-019, :on 860212,turbine Trip/Reactor Scram Occurred from Feedwater Heater Level Problems.Caused by Incorrect Setpoints & Controllers Did Not Respond Efficiently to Level Fluctuations.Setpoints Corrected (← links)
- 05000458/LER-1988-019, :on 880827,fuel Bldg Charcoal Filtration Sys Initiated.Caused by Technicians Lifting Wrong Leads in Junction Box Adjacent to RM-80 Control Cabinet.Technicians Retrained & Proper Leads Lifted (← links)
- 05000458/LER-1986-017, :on 860205,nonseismically Qualified Tubing Installed in Penetration Valve Leakage Control Sys.Caused by Procedural Deficiency.Tubing Removed,Procedure Revised & Acceptable Designs Installed (← links)
- 05000458/LER-1988-017, :on 880819,operations Personnel Discovered That Required Hourly Fire Watch Insp Interval for Containment Bldg Exceeded.Fire Watch Insp Group Will Be Under Direction of Electrical Maint Shift Foreman (← links)
- 05000458/LER-1986-015, :on 860131,containment HVAC Purge Exhaust Valves Failed Local Leak Rate Test.Cause Not Stated.Valve Seats Replaced & Penetration Successfully Retested (← links)
- 05000458/LER-1998-003-01, Forwards LER 98-003-01,suppl to Previous Submittal Dtd 980724.Rept Addressed Adequacy of Control Air Supplies to DGs & Initially Submitted as Voluntary Rept (← links)
- 05000458/LER-1988-016, :on 880815,RWCU Sys Isolation Occurred.Caused by Not Performing Surveillance Test Procedure Steps in Proper Sequence.Personnel Involved Counseled on Event & Technicians Received Training Re Procedures (← links)
- 05000458/LER-1986-007, :on 860115,automatic Reactor Scram Occurred on High Water Level While Attempting to Line Up Feedwater Train B.Caused by Feedwater B Regulator Valve Open W/Controller Indicating Zero Demand (← links)
- 05000458/LER-1986-011, :on 860120,Tech Spec Action Required Sample for Hydrogen Downstream of Recombiners of Offgas Treatment Sys Missed.Caused by Changed Lock on Door to Sample Station. Sampling Performed & Personnel Counseled (← links)
- 05000458/LER-1988-009, :on 880301,unsealed Fire Barrier Penetration Discovered in Control Bldg Fire Wall on 70 Ft Elevation. Caused by Open Hatchway Between Fire Areas & Unqualified Penetration Seal.Fire Watch Established (← links)
- 05000458/LER-1985-054, :on 851127,vibration Discovered in Alert Range for Standby Svc Water Pumps 1SWP P2B,P2C & P2D & LPCS Pump 1E21 PC001.Caused by Personnel Error.Personnel Trained on Use of Green Sheet (← links)
- 05000458/LER-1985-064, :on 851228,hydrogen Gas Grab Sample Not Performed When Main Condenser Offgas Explosive Gas Monitoring Sys Declared Inoperable.Caused by Inaccessible Sample Point.Personnel Counseled (← links)
- 05000458/LER-1986-006, :on 860110,discovered Maint Activities Performed on Feedwater Testable Check Valve W/O Performance of Operability Test Prior to Returning Valve to Svc.Caused by Personnel Error.Valve Successfully Tested (← links)
- 05000458/LER-1986-008, :on 860107,unqualified Wiring Connecting Control Components in Limitorque Motor Operator Discovered. Caused by Design Change.Valves Declared Inoperable & Wiring Replaced W/Qualified Rockbestos Wire (← links)
- 05000458/LER-1986-004, :on 860103,inadvertent ESF Initiation of Standby Svc Water Sys Occurred.Caused by Electricians Accidentally Striking Switchgear Panel Causing Relay to Close.Relays Reset & Sys Returned to Normal (← links)
- 05000458/LER-1988-010, :on 880325,surveillance Requirement for Tech Spec 3.6.5 Not Properly Performed While Unit Operating. Caused by Inadequate Procedure Review.Procedure Revised & Review Performed on Operations (← links)
- 05000458/LER-1985-046, :on 851128,MSIV Containment Isolation Occurred Due to Taking Temp Reading on Leak Detection Differential Temp Switch.Caused by Design Problem W/Temp Switch Type.Mod in Progress (← links)
- 05000458/LER-1985-042, :on 851119,RCIC Steam Line Containment Isolation Occurred During Safety Relief Valve Testing.Caused by Pressure/Flow Fluctuations in Steam Line Due to Lifting of Valves.Damping Potentiometer Adjusted (← links)
- 05000458/LER-1985-045, :on 851126,Div III ECCS Initiation & Injection Occurred.Caused by Improperly Valving Transmitter Into Svc During Surveillance Test Procedure.Pump Secured & Valve Closed.Procedure Clarified.Staff Counseled (← links)
- 05000458/LER-1985-043, :on 851121,reactor Water Cleanup HX Room Temp Switch Trip Setpoint Found Outside Tech Spec Limit.Caused by Error in Approved Surveillance Procedure.Procedure Revised (← links)
- 05000458/LER-1988-013, :on 880623,annulus Mixing & Standby Gas Treatement Sys Not Initiated in Response to Inoperable Annulus Exhaust Radiation Monitor.Caused by Improper Interpretation of Action Requirements (← links)
- 05000458/LER-1988-008, :on 880227,automatic Initiation of Standby Gas Treatment Sys & Reactor Bldg Annulus Mixing Fan Occurred. Caused by Spurious Signals from Radiation Monitor.Mods Requested to Eliminate Noise Sources (← links)
- 05000458/LER-1988-005, :on 880211,trip Occurred on 230 Kv Transmission Line Supplying Power from Offsite Transmission Grid to Div II safety-related Bus.Caused by Phase to Ground Fault. Faulted Grounding Transformer Replaced (← links)
- 05000458/LER-1996-005, :on 960116,discovered Noncompliance W/License Condition by Inadequate Tagging of Hose & Cabling Due to Mgt Change.Trained Operator & Revised Controlling Procedure (← links)
- 05000458/LER-1987-034, :on 871221,full Reactor Scram Occurred Due to Manual half-scram & Intermediate Range Monitor Spike.Caused by Air Trapped in Instrument Ref Line.Unit Successfully Returned to Operation on 871223 (← links)
- 05000458/LER-1988-007, :on 880221,automatic Reactor Scram Initiated Due to Closed Turbine Stop Valves Closure Coincident W/ Greater than 40% Power.Caused by Personnel Error.Personnel Trained (← links)
- 05000458/LER-1988-004, :on 880202,04 & 23,RCIC Sys Isolation Occurred Due to Inadvertent Shorting of Leads.Caused by Procedural Error.Related STP Reviewed & Revised Accordingly (← links)
- 05000458/LER-1988-003, :on 880128,main Turbine Runback Occurred During Unit Power Operation.Caused by Vibration Induced Failure of Temp Controller.Stator Temp Controller Repaired & Relocated to Bldg Structural Member for Protection (← links)
- 05000458/LER-1986-012, :on 860120,security Notified Control Room That Roving Fire Watches Not Entered in Two Remote Shutdown Panel Rooms for Several Hours.Caused by Personnel Error.Fire Watch Reestablished (← links)
- 05000458/LER-1986-010, :on 860116,RWCU Isolation Occurred While Performing Surveillance Test Procedure During Cold Shutdown. Caused by Blown Control Power Fuse When Test Jumper Accidentally Grounded.Fuse Replaced (← links)
- 05000458/LER-1997-001-04, :on 970506,manual Reactor Scram on Lowering Vessel Level Occurred.Caused by Cut Cable Event Determined to Be Site Stds,Procedures & Formal Guidance for Breaching Penetrations.Cut Cable Repaired (← links)
- 05000458/LER-1997-002-03, :on 970506,small Leak at Inlet of Vent Valve for RRS FCV B.Root Cause Is Undetermined.Valve Was Replaced Prior to Returning to Power Operations (← links)
- 05000458/LER-1996-007, :on 960214,failure of Containment Airlock Pneumatic Sys Ball Valve Occurred.Caused by Debris Internal to Sys.Inspected,Lubricated & Properly Torqued Ball Valves & Initiated Design Modification (← links)
- 05000458/LER-1985-058, :on 851218,RWCU Sys Isolation Occurred.Caused by RWCU Temp Switch Module Malfunction.Malfunction Due to Internal Capacitor Failure.Temp Switch Replaced & Sys Returned to Svc (← links)
- 05000458/LER-1985-008, :on 850923,during Refueling,Reactor Protection Sys Actuated Due to Water Level Below Level 3 Scram Setpoint.Caused by Inadequate Procedure & Operator Error. Reactor Pressure Vessel Level Reestablished (← links)
- 05000458/LER-1985-039, :on 851117,in Operational Condition 2 at 30 Mwt,Rwcu Sys Isolated Due to Unstable High Differential Flow Readings.Caused by Water Flashing at Blowdown Flow Element G33 FEN011.Loop Recalibr (← links)
- 05000458/LER-1985-040, :on 851118,at 2% Power RWCU Sys Isolation Occurred.Caused During Maint Activities When Temp Module Removed W/Bypass Switch in Normal Position.Switch Placed in Bypass Position & Trip Reset (← links)
- 05000458/LER-1985-037, :on 851117,while in Startup,Erroneous RWCU Isolation Occurred.Caused by Defective Trip Unit.Trip Condition Reset (← links)
- 05000458/LER-1985-011, :on 850930,both Divs of Secondary & Primary Containment Isolation Spuriously Actuated.Caused by Testing Which Generated Div II MSIV Isolation Signal.Testing Reperformed & No Isolations Occurred (← links)
- 05000458/LER-1985-034, :on 851113,standby Svc Water Sys Declared Inoperable & Unit Manually Scrammed Upon Discovery That Category 1 Structural Elements Not Installed in Piping Tunnels G & H.Work Completed by 851114 (← links)
- 05000458/LER-1985-038, :on 851115,RWCU Isolation Occurred During Performance of STP-207-4215, RWCU High Differential Flow Channel Functional Test. Caused by Procedure Error. Procedure Revised (← links)
- 05000458/LER-1985-036, :on 851113,ECCS/ATWS Initiation Occurred During Performance of Surveillance Test on Reactor Level Instrumentation.Caused by Inadvertent Valve Lineup During Surveillance Test.Precautionary Memo Written (← links)
- 05000458/LER-1985-033, :on 851108,36 Electrical Junction Boxes Discovered Not Sealed as Required for Environ Qualification. Caused by Assignment & Tracking of Generic Work Activity by Bldg Rather than Individual Punch Lists (← links)
- 05000458/LER-1985-035, :on 851111,RWCU Isolation Occurred.Caused by Switch Failure on Demineralizer Receiver Tank Room Temp Differential Trip Unit.Switch Replaced (← links)
- 05000458/LER-1985-007, :on 850919,replacement Level Transmitter for Scram Discharge Vol Did Not Meet IEEE Std 323-1974 Qualifications.Caused by Maint Personnel Not Using Controlled Documents to Specify Replacement (← links)
- 05000458/LER-1985-006, :on 850916,reactor Protection Sys Actuated While in Noncoincident Trip Mode When Malfunction in Undervoltage Printed Circuit Board on Alternate Supply Breaker Tripped Electrical Protection Assembly (← links)
- 05000458/LER-1985-005, :on 850913,reactor Protection Sys Actuation Occurred.Caused by Operator Error When Intermediate Range Monitor Channel E Mode Switch Inadvertently Moved from Operate to Standby.Switch Placed in Operate Position (← links)
- 05000458/LER-1985-004, :on 850906,discovered That APRM Weekly Reactor Protection Sys Tests for Channels B,D,E,G & H Unsatisfactory Per Requirements for Setdown Neutron Trip.Caused by Exclusion of Steps to Verify Half Scram (← links)
- 05000458/LER-1985-003, :on 850904,full Reactor Protection Sys Actuation Occurred.Caused by Unintentional Shorting of Contact While Attempting to Install Jumper.Fuse C71-F7A Replaced & Jumpers Moved to Terminal Blocks (← links)
- 05000458/LER-1985-002, :on 850904,reactor Protection Sys Actuated on High Main Steam Line Radiation & High Scram Discharge Vol Level.Caused by Reactor Protection Sys Channel a Manual Trip During Calibr Coupled W/Inadvertent Noise Spikes (← links)
- 05000458/LER-1985-001, :on 850831,reactor Protection Sys Actuated on High Source Range Monitor Counts.Caused by Core Geometry Change When Fuel Initial Bundle Placed in Core.Four Fuel Loading Chambers Relocated to Eliminate High Count (← links)
- 05000458/LER-1996-014, :on 960710,surveillances Were Missed Due to Human Errors.Caused by Personnel Errors,Procedural Inadequacies & Inadequate Reviews of Test Results.Plant Shut Down to Perform Missed Surveillance (← links)
- 05000458/LER-1996-014-01, Forwards LER 96-014-01,incorporating Changes Listed (← links)
- 05000458/LER-1985-024, :on 851024,w/plant in Cold Shutdown Prior to Initial Criticality,Rwcu Isolated Due to Unstable High Differential Flow Readings.Caused by Flashing Downstream of Blowdown Orifice.Orifice Resized (← links)
- 05000458/LER-1985-027, :on 851027,ESF Actuation Occurred on Div 1 ECCS Due to Erroneous Reactor Vessel Low Level Signal. Caused by Personnel Backfilling Level Instrument W/Common Ref Leg (← links)
- 05000458/LER-1985-026, :on 851024,ECCS Actuation Occurred Due to Inadvertent Venting of Low Pressure Side of Reactor Vessel Level Instrument.Caused by Incorrect Instructions & Failure to Understand Impact of Actions (← links)
- 05000458/LER-1985-031, :on 851101,Div 1 RWCU Isolation Occurred.Caused by Actuation of Area Selection Switch When Operator Took RWCU Room Temps for Surveillance Test Procedure STP-000-001 & Failed to Place Switch in Bypass.Isolation Reset (← links)
- 05000458/LER-1985-030, :on 851101,Div 1 RWCU Sys Isolation Occurred. Caused by Spurious Rwcs Filter Demineralizer Room 1 High Temp Alarm.Rwcu Sys Placed Back in Operation.Mod in Progress to Correct Flashing & Noise Spiking Problems (← links)
- 05000458/LER-1985-029, :on 851031,isolation of Div 1 RWCU Sys Occurred Causing Closing of Four Outboard Isolation Valves.Caused by Spurious Opening of Contacts on Riley Temp Modules.Mods to Temp Modules to Reduce Transient Susceptibility Begun (← links)
- 05000458/LER-1985-028, :on 851030,main Supply Breaker in 13.8 Kv Normal Switchgear Mistakenly Tripped,Causing Several Actuations.Caused by Personnel Error.Equipment Returned to Normal Operation (← links)
- 05000458/LER-1986-002, :on 860101,total Loss of Offsite Power Occurred When Transformers A,B,C & D Tripped.Caused by Spurious Signals from Hand Held Radios.Shielding on Tone Relaying Equipment Being Installed (← links)
- 05000458/LER-1986-003, :on 860101 & 04,unauthorized Jumper Found in Main Control Room Panel 1413-P623 & Unauthorized Lifted Lead Found in Panel 1413-P951,respectively.Cause Undetermined. Affected Sys Immediately Restored (← links)
- 05000458/LER-1985-021, :on 851022,during Surveillance Testing on HPCS Drywell High Pressure Transmitter,Initiation of HPCS Sys Occurred.Probably Caused by Misplaced Test Lead Shorting Trip Unit.Control Technicians Counseled (← links)
- 05000458/LER-1985-020, :on 851028,Div I RWCU Isolation Occurred W/Plant in Operational Condition 4 (Cold Shutdown) & Prior to Initial Criticality.Caused by Blown Fuse (← links)
- 05000458/LER-1985-025, :on 851024 & 26 Reactor Water Conductivity Measurements Not Taken as Required.Caused by Chemistry & Operations Unaware That Surveillance Required by Tech Specs. Technicians Counseled on Procedures (← links)
- 05000458/LER-1985-022, :on 851023,Div II RWCU Isolation Occurred. Caused by Failure of Procedure to Specify Terminals to Be Jumpered in Order to Bypass Isolation Signal.Procedure Revised to Identify Correct Set of Connections (← links)
- 05000458/LER-1985-023, :on 851024,Div II RWCU Isolation Occurred. Caused by Blown Fuse Due to Jumper Falling Off Relay Terminal & Shorting to Ground.Fuse Replaced & Isolation Reset (← links)
- 05000458/LER-1985-060, :on 851224,reactor Scrammed on Low Vessel Level 3 When Running Feedwater Pump Tripped & Discharge Valve on Standby Pump Failed to Open.Caused by Pump Bearing Failure & Incorrect Torque Switch Setting in Valve (← links)
- 05000458/LER-1985-057, :on 851208,automatic Initiation of Div 1 Standby Gas Treatment Sys,Divs 1 & 2 Annulus Mixing & Div 2 Control Room HVAC Occurred.Caused by Voltage Transient. Investigation of Event Initiated (← links)
- 05000458/LER-1985-056, :on 851211,RHR Isolation Valve Received Isolation Signals Resulting in Two Separate RHR Pump a Trips.Caused by Incorrect Installation of Temporary Alteration on Switches.Alteration Corrected (← links)
- 05000458/LER-1985-017, :on 851025,ESF Isolation of Shutdown Cooling Section Valve Occurred.Caused by Inadvertent Grounding of Recorder Lead During Attempt to Attach to Relay Terminal. Fuse Replaced.Procedure STP-204-0602 Revised (← links)
- 05000458/LER-1985-018, :on 851021,RHR Sys Loop a Isolation Occurred. Caused by Technician Mistakenly Connecting Lead to Wrong Relay & Then Misinterpreting Relay Drawings.Isolation Reset. Test Jacks Added to Terminals (← links)
- 05000458/LER-1985-016, :on 851024,ESF Isolation of Shutdown Cooling Suction Valve Occurred.Caused by Jumper Slipping Off Terminal & Blowing Fuse During Surveillance Test.Fuse Replaced.Banana Plugs Installed (← links)
- 05000458/LER-1985-019, :on 851022,Div II RWCU Isolation Occurred. Caused by Loose Jumper Resulting in Shorted & Blown Fuse. Fuse Replaced & Isolation Reset (← links)
- 05000458/LER-1985-052, :on 851208,RHR Sys Isolation Occurred.Caused by Spurious Trip of Rcic/Rhr Equipment Area High Temp Switch. Local Conditions Verified to Be Normal & Isolation Signal Reset (← links)
- 05000458/LER-1985-055, :on 851210,following Loss of Reactor Protection Sys Bus D Power,Rwcu Sys Isolation & RHR Isolation Occurred During Baseline Performance of Surveillance Test Procedure. Caused by Personnel Error (← links)
- 05000458/LER-1985-014, :on 851018,standby Cooling Tower Level Discovered Below Min Tech Spec Requirement of 78%.Caused by Operator Error During Manual Operations of Standby Svc Water Sys.Procedure SOP-0018 Revised (← links)
- 05000458/LER-1985-053, :on 851209,RWCU Sys Isolation Occurred. Caused by Cable to RWCU Isolation Bypass Switch Being Disconnected.Cable Reinstalled & Sys Returned to Svc W/No Further Problems (← links)
- 05000458/LER-1985-049, :on 851206,RCIC Steam Line Containment Isolation Occurred While Testing Safety Relief Valves. Caused by Lifting of Valves Resulting in Pressure/Flow Fluctuations in Steam Line.Isolation Reset (← links)
- 05000458/LER-1985-048, :on 851202,inadvertent RWCU Isolation Occurred. Caused by Operating Defective Temp Switch Module W/O RWCU Isolation Switch in Bypass Position While Performing Surveillance Procedure (← links)
- 05000458/LER-1985-051, :on 851203,RWCU Sys Isolated When Riley Temp Module Read During Surveillance Testing.Caused by Design Problem W/Temp Switches.All Riley Temp Modules Will Be Modified by 860228 (← links)
- 05000458/LER-1985-050, :on 851203,discovered That RHR Pump & Valve Operability Quarterly Surveillances Missed for Subsys a, B & C During Last Surveillance Interval.Caused by Scheduling Error.Surveillances Performed (← links)
- 05000458/LER-1985-015, :on 851013,Channels a & B of Control Room Ventilation Local Intake Radiation Monitors Discovered Inoperable.Caused by Sample Pump Trip Following Offsite Power Excursion.Pumps Restarted (← links)
- 05000458/LER-1985-013, :on 851012,remote Shutdown Panel Dc Power Supply in Main Control Room Located.Caused by Design Deficiency.Mod Request Initiated to Utilize Alternate Power Supply Outside Main Control Room (← links)
- 05000458/LER-1985-047, :on 851128,reactor Scrammed on intermediate- Range Monitor Upscale Trip Due to Reactor Water Pressure/ Transients Introduced by Breaking Condenser Vacuum.Caused by Cold Water Injection (← links)
- 05000458/LER-1985-044, :on 851125,RWCU Sys Isolated Due to High Temp Signal from HX Room.Caused by Failure of Operator to Restore Cooling Water to Containment Coolers in Timely Manner. Procedure AOP-0004 Reviewed for Rev (← links)
- 05000458/LER-1996-015-01, :on 961030,inadvertent Bumping of Recently Installed Power Supply Fuse Resulting in Isolation Valve Closure Occurred.Caused by Risk & Consequences Associated with Depressing.Rcic Isolation Were Identified (← links)
- 05000458/LER-1993-001, :on 930113,determined That RWCU Isolation Setpoint Allowable Value Was Exceeded Due to Faulty Thermocouple Tester.All Three STPs Were Performed in Jan 1993 & Improper Settings Corrected (← links)
- 05000458/LER-1996-016, :on 960806,control Bldg Chiller Timer Defeat Switch Was Left in Test Position.Caused by Inadequate Turnover During Test Evolution.Switch Was Returned to Normal & Sys Lineup Was Performed (← links)
- 05000458/LER-1996-010, :on 960429,reactor SLMCPR Value Given in TS Was non-conservative.Caused by Default Passed to Engineer Performing Analysis.Ge Has Calculated Revised SLMCPR & Associated Operating Limit MCPRs (← links)
- 05000458/LER-1991-008-04, Forwards LER 91-008-04,documenting Addl Case of Improper Cable Separation Discovered as Result of Followup Safety Sys Functional Insp (← links)
- 05000458/LER-1992-029, :on 921230,ESF Actuation Occurred,Resulting in Isolation of RCIC Sys & Causing RCIC Outboard Steam Isolation Valve to Close.Root Cause Indeterminate.Isolation Signal Reset & RCIC Sys Restored (← links)
- 05000458/LER-1992-001, :on 920215,loss of Power to APRMs C & G Resulted in Trip of Div I Reactor Protection Sys & Reactor Scram.Caused by High Level Alarm Relay Not Fully Seated on Base.Failed Power Supply Replaced (← links)
- 05000458/LER-1992-020, :on 921001,personnel Discovered Bag Containing Radioactive Matl Resulting in High Radiation Area,Due to Failure to Properly Perform Radiological Surveys.Personnel Will Be Trained Re Radiological Hazards (← links)
- 05000458/LER-1992-027, :on 921125,RCIC Sys Not Placed in Standby Lineup Prior to Rv Pressure Increasing to Above 150 Psig. Caused by Incorrect Interpretation of TS 3.7.3.Training Will Be Initiated for All ROs & SROs (← links)
- 05000458/LER-1992-012, :on 920721,identified 18 Containment Isolation Valves Which Could Not Be Included in ILRT Program,Per 10CFR50,App J as Required by TS 3.6.4.Caused by Procedural Guidance.Valves Seat Leakage Tested (← links)
- 05000458/LER-1991-018-01, Forwards LER 91-018-01.Rev Defers Installation of Mod Request MR 87-0576 to Locate Indication & Annunication for Div I & II Isolations on Control Room Boards as Opposed to Back Panels (← links)
- 05000458/LER-1992-028, :on 921207,discovered That All Source Range & Intermediate Range Monitors Were Inoperable.Caused by Failure of Shift Supervisor to Recognize That SR Not Current.Procedures Modified (← links)
- 05000458/LER-1992-026, :on 921124,reactor Scrammed from 96% Power Due to Problems W/Steam Bypass & Pressure Regulator Sys. Preventive Maintenance Tasks Will Be Reviewed & Expanded to Ensure Periodic Testing of Sys Components (← links)
- 05000458/LER-1992-004, :on 880407,surveillance of Div 1 Standby Svc Water Pump a Missed.On 880415,surveillance on Div 1 Control Bldg Chiller Svc Water Recirculating Pump Missed.On 901115 & 910208,surveillance Missed on SSW Pumps a & C,Respectively (← links)
- 05000458/LER-1992-004-01, Forwards LER 92-004-01.Rev Submitted to Include Missed Surveillances on Valve 1SWP*AOVF051A Overlooked in Original LER Submittal (← links)
- 05000458/LER-1992-024, :on 921018,equipment Problems W/Control Bldg Ventilation Sys Rendered Both Divs of Sys Inoperable Due to Problem W/Time Delay Relay.Util Awaiting Parts from Qualified Vendor (← links)
- 05000458/LER-1992-025, :on 921110,operating Chiller in Division II, HVK*CHL1B Tripped Due to Indicated Motor Overcurrent Condition.Caused by Faulty Connection on Overcurrent Trip Device.Counseling Provided (← links)
- 05000458/LER-1992-009, :on 920618,determined That Discrepancy in TS 3.6.1.3,Table 3.6.1.3-1 Resulted in Failure to Perform Surveillance Tests on post-accident Sampling Sys Valves. Caused by Inadequate Diagram.Diagram Revised (← links)
- 05000458/LER-1992-017, :on 920819,four Fuses Failed During Performance of STP-058-4802 Causing Dampers to Stroke Closed.Cause for Failed Fuses Indeterminate.Fuses Replaced & Surveillance Test Procedure Steps re-performed Successfully (← links)
- 05000458/LER-1992-016, :on 920816,shutdown Cooling Lost When Containment Isolation Valves Isolated While Welding in Progress in RHR B Pump Cubicle.Caused by Loose Terminal Connection.Welding Stopped & Valves Reset (← links)
- 05000458/LER-1992-014, :on 920814,during Review of NRC Info Notice 92-040,discovered That Divs I & II 4.16 IV Buses Not Receiving Surveillance Insps.Caused by Personnel Error. Change Notice Written & Switchgear Tested (← links)
- 05000458/LER-1992-023, :on 921009,division I DG Placed in Maint Mode for More than One Hour W/O Performance of Surveillance Requirement 4.8.1.1.1.a.Caused by Personnel Error.Refueling Outage Procedures Revised (← links)
- 05000458/LER-1992-022, :on 921007,informed That Div 1 Train in CR Declared Inoperable,Due to Failure of Charcoal to Meet Acceptance Criteria.Charcoal in Div 1 Train Replaced & Satisfactorily Tested (← links)
- 05000458/LER-1992-021, :on 921006,discovered That Drywell Pedestal Floor Drain Sump Overflowed to Pedestal Room.On 920928, Discovered Floor Drain Pumps Inoperable.Caused by Sump Pump Malfunction.Pumps Will Be Repaired (← links)
- 05000458/LER-1996-013, :on 960617,Division I RCIC Isolation Occurred Due to Spurious Signal Generated from Failed Trip Unit. Failed Trip Was Replaced & RCIC Sys Was Restored to Operability 960618 (← links)
- 05000458/LER-1992-019, :on 920911,planned Reactor Shutdown Conducted & Reactor Scrammed at 60%,per Mgt Decision Due to Indication of Reactor Recirculation Pump Motor Winding Leakage.Needed Repairs Made (← links)
- 05000458/LER-1996-012, :on 960606,manual Reactor Scram Occurred Due to Faulty electro-hydraulic Control Power Supplies.Replaced Power Supplies W/Acceptable Ones (← links)
- 05000458/LER-1992-018, :on 920906,reactor Steam Dome Pressure Increased to More than 100 Psig W/Ads a Trip Sys Inoperable Due to Improperly Positioned Root Valve.Caused by Failure to Follow Procedures.Personnel Counseled (← links)
- 05000458/LER-1992-010, :on 920624,radiation Protection Technician Encountered Two Mechanical Maint Craftsmen in High Radiation Area.Caused by Failure to Heed Physical Barriers. Personnel Disciplined & Retrained (← links)
- 05000458/LER-1996-011, :on 960516,personnel Error Resulted in Missed Surveillance & Dry Floor Drain Sump Leakage Detection Monitoring Instrumentation Exceeded TS Allowed Outage Times. Appropriate Disciplinary Actions Taken (← links)
- 05000458/LER-1991-020, :on 911024,discrepancy Discovered Between TS Section 3/4.6.6.3 Re Primary Containment/Drywell Hydrogen Ignition Sys & Applicable Surveillance Test Procedure.Caused by Inadequate Review.Procedures Revised (← links)
- 05000458/LER-1992-013, :on 920730,determined That Surveillances Not Performed on Automatic Wet Pipe Sprinkler Sys.Caused by Incorrect Interpretation of Scope & Applicability of TS 4.7.6.2.c.3.STP-251-3601 Will Be Revised (← links)
- 05000458/LER-1992-015, :on 920808,RWCU Sys Isolated Due to Failure of Temp Switch & Personnel Error.Malfunctioning Switch Replaced & Satisfactorily Tested (← links)
- 05000458/LER-1992-007, :on 920326,motor Operated Valve Vulnerabilty to Hot Shorts Discovered During Review of NRC Info Notice 92-018.Caused by Lack of Thermal Overload Protection.Control Circuitry for Affected MOVs Will Be Reworked (← links)
- 05000458/LER-1992-008, :on 920402,discovered That Containment Bldg Had Been Breached During Mod of Ssws Piping on 920331.Caused by Personnel Error.Training to Be Given on Procedures ENG-3006 & ADM-0028 (← links)
- 05000458/LER-1996-008, :on 960214,mispositioned Drywell Pressure Transmitter Isolation Valve Caused Condition Prohibited by Ts.Restored & Verified Position of Other SR Instrumentation Valves (← links)
- 05000458/LER-1996-009, :on 960214,DG Overspeed Tripped.Caused by Field Flash Relay Failure.Component Replaced & in-depth Evaluation Performed on Effects of Max Temp in Cabinet (← links)
- 05000458/LER-1996-006, :on 960118,misinterpretation of Containment isolation-shutdown Requirements Occurred.Caused by Failure to Have Adequately Considered Plant Operating Practices. In-progress Fuel Movement Activities Suspended (← links)
- 05000458/LER-1996-004, :on 960115,CI of Various BOP Valves Occurred Due to Inattention to Detail.I&C Technician Counseled (← links)
- 05000458/LER-1995-010-02, :on 951130,reactor Thermal Power Limit Exceeded Due to Failure to Consider Required Heat Balance Inputs.No Recommended Corrective Actions Since All New Plant Designs Will Be Implemented as Mods (← links)
- 05000458/LER-1992-011, :on 920713,routine Review of Surveillance Test Procedures (Stps) Revealed That STP Was Overdue.Caused by Personnel Error.Supervisor Counseled & Surveillance Test Scheduling Priority Rept Posted (← links)
- 05000458/LER-1995-007-02, :on 950905,fan Hub for HPCS Pump Room Unit Cooler Failed.Cause Presently Being Investigated.Unit Cooler Repaired & Restored to Operations (← links)
- 05000458/LER-1996-003, :on 960113,ESF Actuations Occurred Due to Electrical Protection Assembly Breaker Trip.Electrical Protection Assembly Replaced (← links)
- 05000458/LER-1992-002, :on 920430,worker Entered Posted Very High Radiation Area W/O Required Monitoring Device.Caused by Personnel Error.Contractor Required to re-take & Pass Exam Prior to re-instatement of RCA Access (← links)
- 05000458/LER-1996-001-01, :on 960104,reactor Manually Scrammed Due to High Turbine Vibration.Due to Tight Clearance Between Low Pressure Turbine B Rotor & Stationary Parts.High Loads/Low Load Valves Being Modified (← links)
- 05000458/LER-1995-013-02, :on 951228,operation Was Outside TS Limits Due to Trip,Maint & Repair of EDG Ii.Repaired Lube Oil Cooler Leak (← links)
- 05000458/LER-1996-002, :on 960105,return Piping Weld for RHR Was Missing from Suppression Pool Level.Caused by Lack of Fusion on C Steel Side of Weld.Reassembled Pipe in Sys During Scheduled Maint Period Outage (← links)
- 05000458/LER-1995-012-01, :on 951219,recirculation Pump Tripped.Caused by Spurious Actuation of Cavitation Interlock.Recirculation Pump Cavitation Loops Recalibrated (← links)
- 05000458/LER-1995-013-01, :on 951215,RCIC Div 1 Isolation Occurred Due to Failed Transmitter.Faulty Transmitter Replaced (← links)
- 05000458/LER-1992-006, :on 920314,unsecured High Radiation Area Boundary Rope Discovered at Entrance to Drywell.Cause unknown.Non-essential Personnel Authorized RCA Access Directed to Stop Work & Report to Meetings (← links)
- 05000458/LER-1995-007, :on 950905,HPCS Unit Cooler Fan Hub Failed. Caused by Casting Defect Consisting of High Porosity & Iron Rich Precipitates Along Grain Boundaries.Repaired & Restored HPCS Unit Cooler to Operational Status (← links)
- 05000458/LER-1995-009-02, :on 951101,surveillance Was Missed Due to Error in Change of Surveillance Test Interval Scheduling.Caused by Human Error & Inadequate Review.Discussed Inappropriate Schedule Frequency Change (← links)
- 05000458/LER-1992-005, :on 920305,reactor Trip Occurred on Turbine Control Valve Fast Closure.Caused by High Winds During Thunderstorm,Resulting in phase-to-ground Fault.Damaged Transformer Reworked (← links)
- 05000458/LER-1995-008-02, :on 951024,Div II RCIC Sys Isolated Due to Spurious Trip Caused by Faulty Temp Switch for RCIC Isolation Main Steam Tunnel Ventilation.Compliance W/Ts 3.3.6.1 & 3.5.3 Immediately Established (← links)
- 05000458/LER-1991-021, :on 911208,reactor Protection Sys Actuation Occurred Due to Operator Failure to Verify Scram Discharge Vol Level.Abnormal Operating Procedure AOP-0001 Revised (← links)
- 05000458/LER-1990-046, :on 901205,unplanned ESF Actuation Occurred When Spurious Trip Signal Received from RCIC Equipment Room Differential Temp Instrumentation.Caused by Isolation Valve Stroked Closed.New Switch Installed (← links)
- 05000458/LER-1991-022, :on 911223,indeterminate Equipment Qualification Status of Resistance Temp Detectors in Fuel Bldg Filter Trains Identified.Caused by Lack of Communication.Training Provided (← links)
- 05000458/LER-1991-023, :on 911226,reactor Water Cleanup Pumps Outboard Suction Valve Received an Isolation Signal from Liquid Control Sys & Pumps Tripped on Low Flow.Caused by Procedure Inadequacy.Test Procedure Changed (← links)
- 05000458/LER-1991-019, :on 911026,discovered That Surveillance Test Procedure for Radwaste Bldg Ventilation Exhaust Duct Noble Gas Activity Monitor Not Completed in TS Time Frame.Caused by Personnel Error.Personnel Briefed (← links)
- 05000458/LER-1990-041, :on 901113,operability Containment Isolation Valve Indeterminate Due to Improperly Installed Torque Switch.Torque Switch Removed & Installed in Proper Position (← links)
- 05000458/LER-1993-002, :on 930212,TS SR Not Properly Implemented in Logic Sys Functional Tests.Caused by Less than Adequate Reviews During Procedure Development Stage.Established Procedural Requirements (← links)
- 05000458/LER-1995-005-02, :on 950627,HPCS Pump Breaker Tripped During Surveillance Testing.Cause of Failure Not Identified.Breaker Internals,Prop Springs & Closing Latch Spring Inspected.W/ (← links)
- 05000458/LER-1995-006-02, :on 950627,identified Electrical Containment Penetration Overcurrent Protection Device Not Adequately Tested Due to Inadequate Development & Implementation of Historic Mod request.ENG-3-033 Revised (← links)
- 05000458/LER-1995-004-01, :on 950419,auxiliary Bldg Door Was Determined Inoperable Due to Failure of Latching Mechanism.Immediately Restored Secondary Containment Door to Acceptable Configuration (← links)
- 05000458/LER-1995-004-02, :on 950419,auxiliary Bldg Door Determined Open Due to Failure of Latching Mechanisms.Root Cause Being Investigated.Door Immediately Restored to Acceptable Configuration (← links)
- 05000458/LER-1995-001, :on 950125,ESG Actuation Occurred During Performance of Surveillance Test Procedure.Cause Could Not Be Determined.Isolation Had Been Reset & Steam Supply Valve Opened After Event (← links)
- 05000458/LER-1995-003-02, :on 950330,missed Fire Watch Due to Failure to Follow Fire Watch Work Rules,Failure to Follow Applicable Procedure & Inadequate Shift Turnover.Disciplined Fire Watch Individual That Violated Work Rules (← links)
- 05000458/LER-1995-002-02, :on 950321,IST Surveillance of EDG Air Receiver Check Valves Was Deficient Due to Inadequate Procedure.Two Deficient STPs Were Corrected & Four Affected EDG Air Receiver Tank Inlet Valves Properly Tested (← links)
- 05000458/LER-1994-031, :on 941003,failure to Identify TS non- Compliance Due to Inadequate Test Procedure.Procedure Revised to Incorporate Acceptance Criteria & Provide Guidance Re Responsibilities of Personnel (← links)
- 05000458/LER-1994-030, :on 941204,reactor Scram Resulting from Inadvertent MSIV Isolation Due to Failure to Follow Test Procedure.Reinforced Mgt Expectations Re Personal Accountability & Procedure Compliance (← links)
- 05000458/LER-1991-003, :on 910322,damper Isolations & Automatic Swap of Divisional Control Bldg Ventilation/Chiller Occurred Due to Inadequate Work Plan.Work Plan Revised to Document Removal & Restoration of Hot & Neutral Wiring (← links)
- 05000458/LER-1991-015, :on 910907,discovered That Monthly Surveillance Test on RCS Sump Drain Flow Monitoring Instrumentation Not Performed at TS Required Time.Caused by Personnel Error. Foreman Counseled & Affected Personnel Briefed (← links)
- 05000458/LER-1991-010, :on 910516,discovery That Containment Isolation Valves Not Verified Closed Every 31 Days,Per Tech Spec 4.6.1.1.b & Updated FSAR Section 6.2.4.3.7.2.Surveillance Procedure STP-000-0201 Revised (← links)
- 05000458/LER-1994-029, :on 941118,discovered That TS Surveillance Requirements Had Not Been Performed within Specified Implementation Period.Caused by Personnel Error Due to Inadequate Review.Test Requirements Completed (← links)
- 05000458/LER-1994-023, :on 940908,reactor Scrammed Due to Spurious Signals from Undamped Rosemount Model 1153 Transmitters. Conditions Leading to Failure Determinded to Be Reportable Per 10CFR21.Model 1153 Transmitters Replaced (← links)
- 05000458/LER-1994-028, :on 941028,manual Reactor Scram Occurred Due to Turbine Vibration.Caused by Temp Sensitive Rotor.Expanded Limitations Which MSRs Can Be Placed in or Removed from Svc to Allow Decrease in Temp Step Changes (← links)
- 05000458/LER-1994-027, :on 941010,control Rod Drive Pipe Found to Be Cracked & Leaking.Caused by Failure Mode Chloride Induced Transgranular Stress Corrosion Cracking.Sections of Steel Pipe Exhibiting Crack Indications Replaced (← links)
- 05000458/LER-1994-032, :on 941214,Division III DG Failed Due to Improper Synchronization Attempt by Operator.Considered Disciplinary Action for Individual Involved & Continued Performance That Monitored Testing of DG (← links)
- 05000458/LER-1991-013, :on 910722,output Breaker of motor-generator Set Supplying Normal Power Supply for Div I RPS Tripped Due to Undetermined Causes.Output Voltage of motor-generator Being Monitored Daily for Limited Time (← links)
- 05000458/LER-1991-012, :on 910702,loss of Div II Reactor Protection Sys Bus Occurred Twice.Caused by Improper Assembly by Vendor & Short of Line to Ground.Breaker Replaced & Termination Reworked (← links)
- 05000458/LER-1991-009, :on 910430,high Radiation Area Barrier Moved Improperly.Caused by Personnel Error.High Radiation Lock Installed & Personnel Involved Counseled (← links)
- 05000458/LER-1994-024, :on 931014,reactor Scrammed During Turbine Test Due to Failure of Relay Contacts to Open.Relay Was Replaced & Successfully Tested (← links)
- 05000458/LER-1994-021, :on 940712,affected Equipment Declared Operable.Caused by Inadequate Control & Implementation of Procedure Writing,Review & Rev Process.Affected STPs Revised (← links)
- 05000458/LER-1994-026, :on 940915,deficiency in STP 055-0101, Ifts Pre-OP & Weekly Interlock Operability Test, Identified as Part of Ongoing TS Review Project.Caused by Inadequate Oversight of STP Development.Ts Implemented (← links)
- 05000458/LER-1994-025, :on 940910,ADS Valve Inoperable Because Fire Wrap Not Replaced After Maint.Caused by Lack of Specific Rev for Connector Replacement.Administrative Procedure Developed (← links)
- 05000458/LER-1990-023, :on 900523,standby Gas Treatment & Annulus Mixing Sys Declared Inoperable.Caused by Failure of Radiation Monitor Sample Pump.Operation Section Procedure, OSP-012 Revised (← links)
- 05000458/LER-1991-002, :on 910216,ESF Actuation Occurred When Reactor Water Sample Containment Isolation Valve.Caused by Failure of Fuse Pressure High.Replacing Fuse & Reopening Reactor Water Sample Valve (← links)
- 05000458/LER-1991-007, :on 910404,determined That Equipment Qualification Status of Pyco Rtds,Installed in Standby Gas Treatment Sys,Indeterminate & Configuration Not Qualified. RTDs Replaced W/Detectors of Sealed Design (← links)
- 05000458/LER-1991-006, :on 910401,operations Cooperative Student Failed to Replace High Radiation Area Barrier Rope Barricade.New Procedural Requirments to Replace High Radiation Entrance Barriers Initiated (← links)
- 05000458/LER-1991-005, :on 910322,design Deficiencies in Fire Doors. Discovered.Caused by Design Error.Hourly Fire Watch Established,Fire Doors Inspected & Surveillance Procedure STP-000-3001 Revised (← links)
- 05000458/LER-1994-007, :on 940501,RPS Bus B Lost Due to Electrical Protection Assembly (EPA) Breakers Failure.Epa Breakers Will Be Modified by Replacing Existing Logic Cards W/New Generation III Logic Cards (← links)
- 05000458/LER-1994-020, :on 940707,discovered TS Surveillance Not Properly Implemented for Svc Water Sys Due to Inadequate Design Review.Engineering Procedure ENG-3-001 Enhanced.W/ (← links)
- 05000458/LER-1994-019, :on 940624,SSW Pumps Automatically Started During Surveillance Testing of Div II Remote Shutdown Control Circuitry.Caused by Procedural Deficiency. Surveillance Tp STP-200-0602 Will Be Revised (← links)
- 05000458/LER-1994-018, :on 940623,loss of SDC Event Occurred Due to Inadvertently Dropped Lead.Caused by Blown Fuse.Fuse Replaced,Sdc re-established & Restoration of RHR Sys Completed (← links)
- 05000458/LER-1994-014, :on 940602,Div I BOP Containment Isolation Signal Generated During Replacment of Base of Relay Due to Inattention to Detail by Electrical Discipline Technical Specialist.Specialist Counseled (← links)
- 05000458/LER-1994-013, :on 940602,normal Power Supply Breaker to HPCS 4,160 Volt Bus Tripped,Leading to Automatic Start & Load of Div II Dg.Caused by Personnel error.Multi-discipline Team Formed to Evaluate Maint Practices (← links)
- 05000458/LER-1994-005, :on 940406,automatic Actuation of ESF Occurred Due to Electrical Transient.Caused by Failure of Offsite Protective Equipment.Offsite KD-10 Relays Replaced & New Set of HCB-1 Relays Installed (← links)
- 05000458/LER-1994-016, :on 940610,RPS Were Considered Inoperable Due to Replacement of Relays Which Had Not Been Functionally Tested.Caused by Faulty Communication Between Wmcs.Personnel Counselled Re Mgt Expectations (← links)
- 05000458/LER-1994-015, :on 940606,fuse Blew While Test Equipment Manual Initiation Was Being Installed.Caused by Failure of Soldered Joint in Amphenol Connector.Blown Fuse Was Replaced & Faulty Connector Repaired (← links)
- 05000458/LER-1994-012, :on 940522,discovered Air from RB Was Leaving Containment Through Ifts Tube Drain Line to FB Due to Inadequate Design.Administrative Controls Were Initiated to Close Ifts Drain Tank Shutoff Valve (← links)
- 05000458/LER-1994-011, :on 940515,inadvertent Initiation of Div I SSW Sys Occurred Due to Procedural Ambiguity.Surveillance Procedure STP-256-3302 Revised & Briefing Re Event & Lessons Learned Being Provided for Operating Crews (← links)
- 05000458/LER-1994-009, :on 940513,discovered That Condensate Leakage from Drywell Air Coolers Being Incorrectly Counted Due to Piping Error.Installed Configuration of Floor & Equipment Drains in Containment & Drywell Verified (← links)
- 05000458/LER-1994-008-01, :on 940509,determined That Min Number of Operable Channels Per Trip Sys for RPS Not Maintained Due to Inadequate Work Package Review.Reviews Emphasizing Importance of Retest Requirements Conducted (← links)
- 05000458/LER-1994-007-01, :on 940501,ESF Actuation Occurred.Caused by Equipment Failure.Replacement of Faulty Equipment & Surveillance Procedure Revised (← links)
- 05000458/LER-1990-048, :on 901224,EQ Operability Status of Two H Ingniters Apparently Exceeded Lifetimes.Caused by Temps Higher than Originally Used to Calculate Lifetimes.Six H Igniters & Associated Cables Replaced (← links)
- 05000458/LER-1994-003, :on 940112,determined That Surveillance Insp Required by TS for Eight safety-related,fire-related Assemblies Not Performed.Caused by Plant Drawing Errors. Hourly Firewatch Verified.Drawings Revised (← links)
- 05000458/LER-1990-004, :on 900211,div II Emergency 125-volt Dc Bus Experienced Voltage Spike Causing Topaz Inverter Unit to Trip.Caused by Drift of Inverter High Voltage Trip Setpoint. Inverters Calibr (← links)
- 05000458/LER-1990-047, :on 901212,reactor Scrammed Due to Turbine Control Valve Fast Closure Signal During Valve Testing. Caused by Low electro-hydraulic Trip Sys Pressure Transient. Orifices Installed on Tcvs,Tsvs & CIVs (← links)
- 05000458/LER-1990-045, :on 901121,unplanned ESF Actuation Occurred During Surveillance Testing of Drywell Bypass Leakage Rate. Caused by Inadequate Procedural Steps in Surveillance Test Procedure.Hpcs Suction Path Automatic Transfer Performed (← links)
- 05000458/LER-1990-044, :on 901119,div II Valves & Dampers Isolated When Breaker Opened Instead of Power Supply Breaker Causing Deenergization of Power Line Conditioner.Caused by Personnel Failure to Follow Procedure (← links)
- 05000458/LER-1990-043, :on 901119,unanticipated Safety Feature Actuation of Rha Sys a Sys & Control Bldg Emergency Filter Train Occurred.Caused by Error in Preparation of Retest Procedure.Personnel Will Receive Training (← links)
- 05000458/LER-1990-039, :on 901109,power Lost of 480-volt Load Ctr, Causing Loss of RPS B Motor Generator Set & Isolations of RWCU & Div II Containment Isolation Valves.Caused by Inadequate Communication.Training Given (← links)
- 05000458/LER-1990-038, :on 901108,loosening of Common Neutral Connection in RPS a Resulted in Div I balance-of-plant Isolation & Loss of Shutdown Cooling.Caused by Design Engineer Error.Mod Request Revised (← links)
- 05000458/LER-1990-037, :on 901105,two Contract Employees Entered High Radiation Area in Violation of Tech Specs (← links)
- 05000458/LER-1990-036, :on 901104,Div I balance-of-plant Isolation Occurred During Mods to Wiring in Control Room Panel.W/ (← links)
- 05000458/LER-1990-035, :on 901027,loss of Shutdown Cooling Occurred Due to Engineer Failing to Recognize Effect of Cable Removal (← links)
- 05000458/LER-1990-032, :on 901021,snubber Removed from Piping in Violation of Tech Spec 3.7.4 (← links)
- 05000458/LER-1990-031, :on 901003,areas Omitted from Hourly Fire Watch Patrols Due to Personnel Error (← links)
- 05000458/LER-1990-029, :on 901006,safety Relief Valve Air Supply Sys Removed from Svc Resulting in Violation of Tech Specs.W/ (← links)
- 05000458/LER-1990-027, :on 900916,fire Watch Missed Due to Personnel Illness (← links)
- 05000458/LER-2020-001, Loss of Control Building Chill Water Due to Chiller Control Panel Installation Error (← links)
- 05000458/LER-1994-004, :on 940113,nonconservative Alarm Setpoint for Liquid Radwaste Gross Activity Monitor 1RMS-RE107.Caused by Personnel Error.Alarm Setpoint for Monitor 1RMS-RE107 Revised to Assure Setpoint Properly Set (← links)
- 05000458/LER-1994-002, :on 940111,containment Airlock Rendered Handle Locking Solenoid Mechanism & Interlock Inoperable.Caused by Personnel Error.Maint & Mgt Center Supervision Disciplined Concerning Inadequate Communications (← links)
- 05000458/LER-1993-027, :on 931120,discovered Firewatch Patrol Not Completed in Timely Manner During Computer Sys Outage Due to Conflicting Priorities for Security Personnel.Memo Issued Raising Awareness of Fire Watch Urgency (← links)
- 05000458/LER-1993-026, :on 931117,isolation of Reactor Core Isolation Cooling Sys Occurred Due to Failure of Relay. Cause Requires Additional Evaluation.Three Relays Replaced & Shipped to Mfg for Analysis (← links)
- 05000458/LER-1989-036, :on 891017,various Sys Motor Operated Valves Found Energized Contrary to Fire Hazards Analyses (← links)
- 05000458/LER-1990-028, :on 900930,RPS Actuation Occurred on High Level Scram Disharge Vol (← links)
- 05000458/LER-1990-030, :on 901010,high Radiation Area Violated Due to Personnel Error (← links)
- 05000458/LER-1993-014, :on 930701,licensee Identified Deficiency in Fire Barrier Separation Requirements.Caused by Improper Understanding of Extent Approved Deviation.Evaluations Provided for Engineers (← links)
- 05000458/LER-1990-025, :on 900809,surveillance Requirements Not Performed on Valve Due to Omission from Tech Spec Table 3.6.4-1.Caused by Personnel Oversight.Monthly Operating Log Revised (← links)
- 05000458/LER-1990-026, :on 900810,RWCU Isolated.Caused by Short Circuit During Jumper Manipulation.Prompt Maint Work Order Initiated to Replace Blown Fuses (← links)
- 05000458/LER-1993-022, :on 930924,an Esfa Occurred During Performance of Surveillance Test Procedure.Caused by Malfunction of Temp Switch.Mod Request Will Be Initiated to Place Switch W/Keyed Lock Downstream of Terminals (← links)
- 05000458/LER-1990-024, :on 900719,discovered Missed Fire Watch Patrol. Caused by Miscommunication & Inadequate Verification of Fire Watch Log.New Log Book Designed to Be Passed Down to Each Succeeding Shift,Will Be Used (← links)
- 05000458/LER-1993-020, :on 930821,determined That Exhaust Tornado Dampers for Several Bldgs Would Not Reopen Following Passage of Postulated Tornado Due to Incomplete Purchase Spec.Severe Weather Operation Procedure AOP-0029 Revised (← links)
- 05000458/LER-1993-023, :on 930922,discovered Improper Engagement of Containment Airlock Door Handwheel Locking Mechanism Due to Inadequate Testing & Acceptance Criteria Supporting Plant Mod.Interlock Levers Modified (← links)
- 05000458/LER-1993-018, :on 930813,isolation of RCIC Sys Occurred During Surveillance Test When Technician Connected Digital Multimeter to Wrong Terminals of Relay Base.Caution Statement Added to STP-207-4241 (← links)
- 05000458/LER-1990-011, :on 900326,faulted Condition on Transformer 1NJS-X1A Resulted in Trip of Circuit Breaker ACB-016 on Switchgear 1NJS-SWGR1A.Caused by Random Failure of Transformer.Tranformer Replaced (← links)
- 05000458/LER-1993-019, On 930817,determined Hydrogen Igniter Cable Exceeded Equipment Qualification Lifetime Due to Localized High Drywell Temperatures.Replaced Hydrogen Igniter Cable (← links)
- 05000458/LER-1993-025, :on 931104,TS 3.0.3 Was Entered Due to Inadvertently Inoperability of Loop B of LPCI Sys.Caused by Personnel Failure to Correctly Interpret & Act Upon Caution of Procedure.Returned Loop to Operable Status (← links)
- 05000458/LER-1993-016, :on 930727,HPCS Sys Actuation Occurred Due to Improperly Prepared Rev to Surveillance Test Procedure. Changed Surveillance Procedure STP-051-4811 (← links)
- 05000458/LER-1993-012, :on 930603,deficiency in Plant Surveillance Test Procedures Identified.Caused by Inattention to Detail During Initial Procedure.Surveillance Test Procedures Revised (← links)
- 05000458/LER-1993-015, :on 930723,discovered Time Response Testing of Isolation Instrumentation for RWCU & RCIC Sys Not Performed at Intervals Required by Tss.Caused by Scheduling Error & Misinterpretation of Ts.Schedule Revised (← links)
- 05000458/LER-1993-010, :on 930514,SDC Loss for Three Minutes When SDC Suction Valves Closed.Caused by Failure to Identify Need for Compensatory Measures.Revised Procedural Guidance Clarifying Valve Isolation (← links)
- 05000458/LER-1990-022, :on 900518,HPCS Sys Declared Inoperable & 14-day Shutdown Limiting Condition for Operation Entered Due to Inoperative Suppression Pool Level Transmitter.Caused by Personnel Error.Reactor Operators Trained (← links)
- 05000458/LER-1993-013, :on 930629,high Pressure Core Spray Pump Failed to Start & Run During Surveillance Test Due to Failed Overfrequency Relay.Relay Tested & Installed in Switchgear (← links)
- 05000458/LER-1993-008, Forwards Rev 1 to LER 93-008 Re Relief Request Improperly Prepared for in-service Testing Program Which Resulted in Noncompliance W/Main Steam Isolation Valve Testing Requirement (← links)
- 05000458/LER-1993-011, :on 930521,determined That Mode Switch Placed in Refuel Position During Testing of Switch Interlock Functions.Caused by Conflicting Info in Surveillance Procedures.Operating Procedure Revised (← links)
- 05000458/LER-1993-009, :on 930504,discovered That Surveillance Test Procedure for Control Bldg Chilled Water Sys Quarterly Pump Missed Due to Cognitive Personnel Error.Administrative Procedure Will Be Revised (← links)
- 05000458/LER-1993-007, :on 930420,noted That an Isolation of Inboard & Outboard MSIV & Ms Line Drains Occurred.Caused by Lack of Personnel Knowledge of Unique Maint Conditions.Precaution Will Be Added to Sys Operating Procedure (← links)
- 05000458/LER-1993-005, :on 930415,discovered That RCIC Steam Line Flow - High Timer Function Never Performed on Monthly Basis. Caused by Failure to Include Test in Initial Procedure Development Process.Procedures Revised (← links)
- 05000458/LER-1990-021, :on 900509,RWCU Sys Differential Flow High Trip Instrumentation Inoperable for Period Greater than Allowed by Tech Spec.Caused by Misinterpretation of Tech Spec 3/4.3.2,Table 3.3.2.-1.4.Personnel Retrained (← links)
- 05000458/LER-1990-020, :on 900504,radwaste Operator Entered High Radiation Area W/O Dose Rate Meter,Alarming Dosimeter or Radiation Protection Technician Coverage.Caused by Personnel Error.Training Provided to Operators (← links)
- 05000458/LER-1990-019, :on 900425,RWCU Sys Isolation & ESF Actuation Occurred After Completion of Channel Check of Riley Temp Trip Unit.Caused by Unit Exceeding Differential Temp Setpoint of 46 F.Unit Replaced (← links)
- 05000458/LER-1990-017, :on 900419,inadequate Fire Barrier in Shake Space Occurred Contrary to Tech Spec.Caused by Oversight. Roving Fire Watch Scheduled.Maint Will Rework Voids & Install Seismic Gap Seal (← links)
- 05000458/LER-1990-015, :on 900409,loss of Div II Reactor Protection Sys Bus Occurred Due to Trip of Electrical Protection Assembly.Another Trip Also Occurred on 900415.Caused by Faulty Integrated Circuit Logics (← links)
- 05000458/LER-1990-016, :on 900414,insulator Fault on Local Grid Resulted in Trip of 500 Kv Breaker.Caused by Spurious Alarm Signal from Control Room Local Intake Radiation Monitor 1RMS*RE13B.Sys Returned to Normal Operation (← links)
- 05000458/LER-1990-014, :on 900407,reactor Scram Occurred While Testing Main Turbine Combined Intermediate Valves.Caused by Low Pressure Signal from Emergency Trip Sys of Electrohydraulic Control Sys.Two Solenoid Valves Replaced (← links)
- 05000458/LER-1990-013, :on 900405,discovered That Control Bldg Chiller Motor Current Limiter C Set Incorrectly at 56% Instead of 100%.Caused by Incorrect Setting & Maint Activities.Loop Calibr Data Sheet Revised (← links)
- 05000458/LER-1990-012, :on 900401,ESF Actuations Occurred Due to Electrical Protection Assembly Breakers Trip.Caused by Voltage Regulator Failure.Replacement Voltage Regulator Card Installed in MG 1C71-S001B (← links)
- 05000458/LER-1990-007, :on 900311,control Bldg Ventilation Sys Isolated & Filtration Unit Initiated.Caused by Severe Electrical Transient.Performance of Radiation Monitors Improved Prior to Implementation of Procedures (← links)
- 05000458/LER-1993-004, :on 930324,deficiency Discovered in Locking of Reactor Bldg Door.Caused by Lack of Understanding of TS Requirements for Locking Airlock Door.Operator Aids Posted & Permanent Locking Device Installed on Doors (← links)
- 05000458/LER-1993-002-01, Forwards LER 93-002-01 Providing Details of Addl Investigation Re Logic Sys Functional Test Not Fulfilling TS SR (← links)
- 05000458/LER-1991-003-03, Forwards LER 91-003-03,reflecting Requirement That Lead Planners Review Every Maint Job Plan Package (← links)
- 05000458/LER-1990-010, :on 900320,rope Barricade for High Radiation Area Removed.Caused by Personnel Error.Training on Radiation Protection Practices Will Be Provided to Plant Operators to Emphasize Importance of Requirements (← links)
- 05000458/LER-1990-009, :on 900319,both Inboard & Outboard Isolation Valves Failed Local Leak Rate Test.Caused by Silt & Corrosion Products Present in Both Valves.Disk Hinge Ping Area Cleaned & Valve Seats Inspected (← links)
- 05000458/LER-1990-008, :on 900315,main Turbine Generator Tripped, Resulting in Reactor Scram.Caused by Loss of Field Relay. Relay Reworked & Returned to Svc After Testing & Maint Procedures Revised (← links)
- 05000458/LER-1990-006, :on 900309,error in Calculations for Pressure Temp Limit Curves in Tech Specs 3.4.6.1-1 Discovered.Caused by Personnel Error.Tech Spec Pressure Temp Limit Curves to Be Revised,Per Generic Ltr 88-11 (← links)
- 05000458/LER-1994-006-01, :on 940414,SS Recognized That Required Frequency for Performing STP 057-3705 Had Been Exceeded. Caused by Inadequate Supervisory Methods.Corrective Action: Inhouse Tracking Process Will Be Created (← links)
- 05000458/LER-1991-001, :on 910212,use of Inadequate Control Room Filter Initiation Signal Due to Discrepancies Between Logic Diagrams.Main Control Room Doses Due to MSLB Outside Containment Recalculated (← links)
- 05000458/LER-1994-022, :on 940907,TS Violation Occurred Due to Inadequate Fire Watch.Retrained Personnel Associated W/ Painting Activities (← links)
- 05000458/LER-1991-004, :on 910321,RCIC Turbine Main Steam Supply Line Outboard Containment Isolation Valve Isolated.Caused by Negative Trip Setpoint of Trip Unit Being Reached.Caution Added to RCIC Sys Operating Procedures (← links)
- 05000458/LER-1990-040, :on 901110,technician Inadvertently Shorted Relay Terminals,Energizing Relay & Causing Emergency Diesel Generator to Start Unexpectedly.Caused by Personnel Error. Generator Manually Secured (← links)
- 05000458/LER-1990-001, :on 900103,isolation of RCIC Steam Supply Inboard Isolation Valve Occurred During Surveillance Testing of RCIC Sys.Caused by Technician Lifting Wrong Lead,Causing ESF Actuation.Lead Relanded on Terminal (← links)
- 05000458/LER-1989-040, :on 891117,surveillance Test of Div II Penetration Valve Leakage Control Sys Air Supply Header Pressure Not Performed within Allowable Tolerance.Addl Training of Scheduling Group Will Be Provided (← links)
- 05000458/LER-1989-039, :on 891114,discovered That Required post-maint Overall Leak Rate Test on Upper Containment Airlock Not Performed After Replacement of Inflatable Seal.Caused by Personnel Error.Maint Procedure Revised (← links)
- 05000458/LER-1989-045, :on 891212,Div I Standby Svc Water Pumps Received Automatic Start Signal Due to Spurious Low Svc Water Pressure Signal When Normal Svc Water Pump Secured. Signal Cleared & Sys Restored to Normal Lineup (← links)
- 05000458/LER-1989-044, :on 891211,unplanned ESF Actuation Occurred, Resulting in Isolation of Rcic.Caused by Technician Failing to Perform Steps of Surveillance Test Procedure in Sequence.Div II Isolation Signal Reset (← links)
- 05000458/LER-1989-043, :on 891201.two Outboard MSIVs Inoperable Due to Failure of Corresponding Fast Closure solenoid-operated Valve.Caused by Incomplete Removal of Silicone Lubricant. Lubricant Removed by Application of Acetone (← links)
- 05000458/LER-1989-042, :on 891201,main Turbine Generator Tripped, Resulting in Reactor Scram.Caused by Sensing Fault on Offsite 230 Kv Line.Sys Maint Procedure Being Revised to Include Test of Failed Portion of Relay (← links)
- 05000458/LER-1989-041, :on 891125,unplanned ESF Actuation Occurred as Result of Two Leads Shorted Together During Testing of Control Circuitry,Causing Valve Isolation from Suppression Pool.Sys Lineup Restored to Normal Position (← links)
- 05000458/LER-2019-004, For River Bend Station, Unit 1, Potential Loss of Safety Function for All ADS, (Automatic Depressurization System) Valves (← links)
- 05000458/LER-1989-038, :on 891113,unplanned Loss of Div I 125 Volt Dc Bus Occurred.Caused by Failure to Adequately Verify Clearance Boundaries.Power Restored to Bus & Isolations Reset (← links)
- 05000458/LER-1989-037, :on 891108,Div II Control Bldg Ventilation Sys Isolated & Filtration Unit Automatically Initiated.Caused by Spurious Signal from Control Bldg Intake Radiation Monitor. Voltage Suppressors Installed on Monitors (← links)
- 05000458/LER-1989-035, :on 890930,reactor Automatically Scrammed During Performance of Routine Reactor Protection Sys.Caused by Defective Test Switch in Reactor Protection Sys.Test Switch Replaced Via Prompt Maint Work Order (← links)
- 05000458/LER-1989-033, :on 890916,electrical Power Lost to Div II 120 Volt Ac Distribution Panel,Resulting in auto-start of Div II Standby Gas Treatment & Annulus Mixing Sys.Caused by Failure of Elgar Power Line Conditioning Transformer (← links)
- 05000458/LER-1989-034, :on 890930,determined That 10 H Run of Standby Gas Treatment Sys Train B Not Performed within Allowable Surveillance Tolerance Which Had Ended on 890904.Caused by Human Error.Operations Personnel Trained (← links)
- 05000458/LER-2019-002-01, Reactor Coolant Pressure Boundary Leakage Due to Contaminates Deposited on External Pipe Surface After Legacy Adhesive Spill (← links)
- 05000458/LER-2019-003, Manual Reactor Scram Initiated in Response to Loss of Feedwater Due to Abnormal Plant Configuration (← links)
- 05000458/LER-2019-002, Standby Liquid Control System (SLC) Pipe through-wall Leak (← links)
- 05000458/LER-2019-001, Initiation of Standby Service Water Due to Inadequate Monitoring of System Parameters During Maintenance Activities (← links)
- 05000458/LER-2018-011, For River Bend Station, Unit 1, Condition Prohibited by Technical Specifications Due to Inadequate Design Change of Under Voltage Relay Trip Set Point Range (← links)
- 05000458/LER-2018-010, Reactor Scram Due to Turbine Control Valve Failure (← links)
- 05000458/LER-2018-009, Inadvertent Initiation of Reactor Core Isolation Cooling Due to Personnel Error (← links)
- 05000458/LER-2018-005, Cancellation of LER 2018-005-00 for River Bend, Unit 1, Loss of Reactor Protection System Scram Function During Main Steam Isolation Valve Channel Functional Tests Due to Use of a Test Fixture (← links)
- 05000458/LER-2018-008, Potential Loss of Safety Function and Unanalyzed Cond It Ion Due to Legacy Design Deficiency in Control Building HVAC (← links)
- 05000458/LER-2018-007, Manual Reactor Scram Due to Reactor Recirculation Pump Trip Caused by Transformer Failure (← links)
- 05000458/LER-2018-004, Unanalyzed Condition Due to Inadequate Protection from Tornado Generated Missiles (← links)
- 05000458/LER-2018-002, Inadvertent High Pressure Co Re Spray Initiation and Loss of Safety Function Due to Inadequate Work Instruction Mitigation Actions (← links)
- 05000458/LER-2018-003, Condition Prohibited by Technical Specifications Due to Untimely Recognition of Failed Laboratory Analysis of Ventilation Charcoal Sample (← links)
- 05000458/LER-2018-001, Potential Loss of Safety Function of Control Building HVAC Due to Legacy Design Flaw (← links)
- 05000458/LER-1917-009, Regarding Potential Loss of Safety Function of Secondary Containment Due to Unsecured Personnel Door (← links)
- 05000458/LER-1917-007, Unit 1 Regarding Automatic Reactor Scram Due to Failure of Main Generator Voltage Regulator Mode Transfer Relay (← links)
- 05000458/LER-1917-006, Re Potential Loss of Safety Function of Onsite Power Sources Due to Inoperability of Control Building Chiller (← links)
- 05000458/LER-1917-005, Regarding Operations Prohibited by Technical Specifications Due to Inoperable Main Control Room Filter Train (← links)
- 05000458/LER-1917-003, Regarding Manual Reactor Scram Initiated in Response to Increase in Steam Pressure During Steam Leak Troubleshooting (← links)
- 05000458/LER-2017-002, Regarding Loss of Safety Function of Onsite Electrical Distribution Due to Malfunction of Control Building HVAC System (← links)
- 05000458/LER-2017-001, Regarding Operations Prohibited by Technical Specifications (Conduct of Operations with a Potential to Drain the Reactor Vessel with Primary Containment Open) (← links)
- 05000458/LER-2016-007, Regarding Operations Prohibited by Technical Specifications Due to Failure to Implement Required Actions within Completion Time (← links)
- 05000458/LER-2016-006, Potential Loss of Safety Function of Multiple Systems Due to Design Deficiency in 480-volt Circuit Breakers (← links)
- 05000458/LER-2016-005, Regarding Potential Loss of Safety Function of Onsite AC Sources and Operations Prohibited by Technical Specifications Due to Uncorrected Circuit Breaker Control Logic Design Causing Intermittent Failure to Close (← links)
- 05000458/LER-2016-003, Regarding Operations Prohibited by Technical Specifications Due to Reactor Control Rod Drift During Core Alterations (← links)
- 05000458/LER-2016-004, Regarding Actuation of the Division 1 Emergency Diesel Generator and Primary Containment Isolation Logic Due to Partial Loss of Offsite Power (← links)
- 05000458/LER-2016-001, Regarding Potential Loss of Secondary Containment Safety Function Due to Failure of Auxiliary Building Ventilation System (← links)
- 05000458/LER-2016-002, Regarding Automatic Reactor Scram and Division 2 Primary Containment Isolation Due to Offsite Grid Electrical Transient (← links)
- 05000458/LER-2015-010, Regarding Potential Loss of Safety Function of High Pressure Core Spray Due to Failure of Main Control Building Ventilation Chiller (← links)
- 05000458/LER-2015-009, Regarding Automatic Reactor Scram Due to Partial Loss of Offsite Power Caused by Fault in Local 230K Switchyard (← links)
- 05000458/LER-2015-008, Of River Bend Station, Unit 1, Regarding Loss of Safety Function of High Pressure Core Spray Due to Failure of Main Control Building Ventilation Chiller (← links)
- 05000458/LER-2015-007, Unit 1 Regarding Potential Loss of Safety Function of High Pressure Core Spray Due to Failure of Main Control Building Ventilation Chiller (← links)
- 05000458/LER-2014-003-01, Regarding Operations Prohibited by Technical Specifications Due to Concurrent Inoperability of Reactor Protection System Channels (← links)
- 05000458/LER-2015-006, Regarding Operations Prohibited by Technical Specifications Due to Error in Initial Operability Evaluation (← links)
- 05000458/LER-2015-005, Regarding Automatic Reactor Scram Due to Low Reactor Water Level Following a Loss of Instrument Power (← links)
- 05000458/LER-2015-003, Regarding Operations Prohibited by Technical Specifications and Loss of Safety Function Due to Inoperability of Division 2 Containment Penetration Leakage Control System (← links)
- 05000458/LER-2015-004, Regarding Potential Loss of Safety Function of Onsite Ac/Dc Distribution Systems Due to Postulated Main Control Building Heat-up Following Loss of Ventilation Cooling System (← links)
- 05000458/LER-2015-002, Regarding Emergency Diesel Generator Start Circuit Actuation Due to Loss of Power from Reserve Station Service No. 2 (← links)
- 05000458/LER-2015-001, Regarding Operations Prohibited by Technical Specifications Due to Deficient Local Leak Rate Test Procedures Containing Erroneous Valve Alignments (← links)
- ML060720037 (redirect page) (← links)
- 05000458/LER-2006-007, Regarding Automatic Reactor Scram Due to Inadvertent Isolation of Main Feedwater Headers (← links)
- 05000458/LER-2006-006, Re Plant Mode Change with One Offsite Power Supply Inoperable Due to 4.16kv Breaker Alignment (← links)
- 05000458/LER-2006-005, Unit 1 Re Automatic Start of Standby Service Water During Realignment of Reactor Plant Cooling Water (← links)
- 05000458/LER-2006-004, Regarding Automatic Reactor Scram Following Recirculation Pump Downshift Due to Failed Optical Isolator Card (← links)
- 05000458/LER-2006-003, Regarding Automatic Start of Division 2 Standby Service Water System During Normal Service Water Pump Shift (← links)
- 05000458/LER-2006-002, Re Loss of Safety Function of High Pressure Core Spray Due to Manual Deactivation (← links)