Pages that link to "05000298/LER-1982-001, Forwards LER 82-001/03L-0.Detailed Event Analysis Submitted"

The following pages link to 05000298/LER-1982-001, Forwards LER 82-001/03L-0.Detailed Event Analysis Submitted:

Displayed 49 items.

• ML20041C381 (redirect page) ‎ (← links)
• 05000298/LER-1982-013, Forwards LER 82-013/03L-0.Detailed Event Analysis Submitted ‎ (← links)
• 05000298/LER-1982-012, Forwards LER 82-012/03L-0.Detailed Event Analysis Submitted ‎ (← links)
• 05000298/LER-1982-011, Forwards LER 82-011/03-0.Detailed Event Analysis Submitted ‎ (← links)
• 05000298/LER-1982-010, Forwards LER 82-010/03L-0.Detailed Event Analysis Submitted ‎ (← links)
• 05000298/LER-1982-009, Forwards LER 82-009/03L-0.Detailed Event Analysis Submitted ‎ (← links)
• 05000298/LER-1982-020, Forwards LER 82-020/03L-0.Detailed Event Analysis Submitted ‎ (← links)
• 05000298/LER-1982-018, Forwards LER 82-018/03L-0.Detailed Event Analysis Submitted ‎ (← links)
• 05000298/LER-1982-019, Forwards LER 82-019/03L-0.Detailed Event Analysis Submitted ‎ (← links)
• 05000298/LER-1982-017, Forwards LER 82-017/03L-0.Detailed Event Analysis Submitted ‎ (← links)
• 05000298/LER-1982-016, Forwards LER 82-016/03L-0.Detailed Event Analysis Submitted ‎ (← links)
• 05000298/LER-1982-015, Forwards LER 82-015/03L-0.Detailed Event Analysis Submitted ‎ (← links)
• 05000298/LER-1982-026-03, /03L-0:on 821222,diesel Generators (Alternate Source of Emergency Power) Not Tested to Demonstrate Operability When 69-kV Line Taken Out of Svc for Repairs. Cause Not Stated.Operators Informed of Testing Procedures ‎ (← links)
• 05000298/LER-1982-023-03, /03L-0:on 821128,while Snubber CS-57 Taken Out of Svc to Repair Oil Leak,Snubber Found Inverted.Caused by Loose Extension Tube Locknut Allowing Snubber to Rotate. Snubber Replaced ‎ (← links)
• 05000298/LER-1982-020-03, /03L-0:on 821004,diesel Generator 2 Shutdown W/No Alarms or Indications.Water Found in Lube Oil Sys.Caused by Rupture of Left Cylinder Liner Expansion Seal on Diesel Engine.Seal Replaced & Part Returned to Vendor ‎ (← links)
• 05000298/LER-1982-018-03, /03L-0:on 820727,torus Water Temp Rose to 102 F, Exceeding Tech Spec Limit.Caused by Greater Bulk Temps During HPCI Test.More Sophisticated Torus Temp Monitoring Sys Will Be Installed by Jul 1983 ‎ (← links)
• 05000298/LER-1982-014-03, /03L-0:on 820607,rejectable Indications Found in Heat Affected Zones of Welds BJ-20,BJ-23,BJ-13 & BJ-15. Caused by Improper Fabrication Techniques During Original Const.Affected Piping & Fittings Replaced ‎ (← links)
• 05000298/LER-1982-019-03, /03L-0:on 820726,drywell Equipment Sump 1G High Level Alarm W/Subsequent Automatic Pump Operation Observed. Caused by Blown Fuse in Power Supply 20-545A for Flow Recorder & Flow Integrator.Fuse Replaced ‎ (← links)
• 05000298/LER-1982-017-03, /03L-0:on 820713,at Completion of Overspeed Test on Diesel Generator 2,diesel Tripped Before Loading.Caused by Low Lube Oil Pressure Switch.Switch Replaced ‎ (← links)
• 05000298/LER-1982-016-03, /03L-0:on 820712,diesel Generator Tripped W/No Alarms or Indications.Redundant Sys Operable.Caused by Drift in Holding Mechanism of Safety Trip Valve Overspeed Device. Valve & Section of Control Air Line Replaced ‎ (← links)
• 05000298/LER-1982-015-03, /03L-0:on 820706,eleven Penetrations Leaked Excessively During Leak Rate Test.Cause Not Stated.Valve Repairs Performed on Anchor Gates,Globes & Checks.Anchor 6 Gate Valve Replaced.Final Leakage within Limit ‎ (← links)
• 05000298/LER-1982-013-03, /03L-0:on 820607,during Performance of Snubber Operability Test,Two Mechanical Shock Suppressors, RR-SNUB-SS7A1 & RR-SNUB-SS7B1,found Inoperable.Caused by Overload of Snubbers.Snubbers Replaced ‎ (← links)
• 05000298/LER-1982-012-03, /03L-0:on 820522,during Reactor Vessel Head Removal for Refueling,Closure Stud Nuts Were Improperly Detensioned.Caused by Personnel Error.Personnel Informed of Mistake & Procedure Checklist Revised ‎ (← links)
• 05000298/LER-1982-011-03, /03-0:on 820514,isolation Valve RR-740AV Failed to Close.Caused by Dirty Solenoid Slug.Solenoid Valve Replaced ‎ (← links)
• 05000298/LER-1982-010-03, /03L-0:on 820517,diesel Generator 1 & Output Breaker Tripped Shortly After Starting.Caused by Open Contact of Potential Transformer Disconnect Switch Interrupting Voltage to Overcurrent Relay Restraining Coil ‎ (← links)
• 05000298/LER-1982-009-03, /03L-0:on 820428,suppression Chamber Level Instrument PC-LI-13 Failed full-scale.Caused by Personnel Error.Ref Water Leg Drained While Collecting Torus Water Sample.Level Transmitter Replaced.Sampling Valve Tagged ‎ (← links)
• 05000298/LER-1982-008-03, /03L-0:on 820415,during Diagnostic Testing of Mechanical Snubbers,Model PSA-10 SN/544 Snubber Exceeded Specified Acceleration Rate.Caused by Improper Installation of Clutch Spring.Snubber Sent to Manufactures for Repair ‎ (← links)
• 05000298/LER-1982-008, Forwards LER 82-008/03L-0.Detailed Event Analysis Submitted ‎ (← links)
• 05000298/LER-1982-007-03, /03L-0:on 820324,differential Pressure Between Drywell & Suppression Chamber Reduced Below Tech Spec Limits During RHR Test Mode Operation.Caused by Nitrogen Flow from Drywell to Suppression Chamber.Return Piping to Be Modif ‎ (← links)
• 05000298/LER-1982-007, Forwards LER 82-007/03L-0.Detailed Event Analysis Submitted ‎ (← links)
• 05000298/LER-1982-006-03, /03L-0:on 820322,while Inerting Drywell,Ductwork Between Primary Containment & Reactor Bldg Ventilation Found Failed in Several Places,Preventing Oxygen Concentration & Differential Pressure from Being Established ‎ (← links)
• 05000298/LER-1982-006, Forwards LER 82-006/03L-0.Detailed Event Analysis Submitted ‎ (← links)
• 05000298/LER-1982-005-03, /03L-0:on 820221,MSIV-86A Found to Have Closing Time Faster than Tech Spec.Cause Unknown.Closing Time Adjusted & Control Valve Locked Into Required Position ‎ (← links)
• 05000298/LER-1982-004-03, /03L-0:on 820109,during Planned Power Reduction, Min Critical Power Ratio Was Below Operating Limit W/O Initiation of Corrective Actions Required by Tech Specs. Caused by Personnel Error.Procedures Will Be Revised ‎ (← links)
• 05000298/LER-1982-004, Forwards LER 82-004/03L-0.Detailed Event Analysis Submitted ‎ (← links)
• 05000298/LER-1982-003-03, /03L-0:on 820126,overload Alarm Condition Received While Closing Valve RHR-MO-26B,caused by Motor Brake Coil Failing to Release.New Motor & Brake Installed & Tested Satisfactorily ‎ (← links)
• 05000298/LER-1982-001-03, /03L-0:on 820122,reactor Vessel Level Switch NBI-LIS-72C Failed to Trip at Tech Spec Setpoint.Caused by Misalignment of Switch Mechanism.New Switch Calibr & Installed ‎ (← links)
• 05000298/LER-1982-003, Forwards LER 82-003/03L-0.Detailed Event Analysis Encl ‎ (← links)
• 05000298/LER-1982-001 (redirect page) ‎ (← links)
  • 05000298/LER-2001-006 ‎ (← links)
  • 05000298/LER-2001-005 ‎ (← links)
  • 05000298/LER-2001-004 ‎ (← links)
  • 05000298/LER-2001-003 ‎ (← links)
  • 05000298/LER-2001-002 ‎ (← links)
  • 05000298/LER-2001-001 ‎ (← links)
  • 05000298/LER-1982-013, Forwards LER 82-013/03L-0.Detailed Event Analysis Submitted ‎ (← links)
  • 05000298/LER-1982-012, Forwards LER 82-012/03L-0.Detailed Event Analysis Submitted ‎ (← links)
  • 05000298/LER-1982-011, Forwards LER 82-011/03-0.Detailed Event Analysis Submitted ‎ (← links)
  • 05000298/LER-1982-010, Forwards LER 82-010/03L-0.Detailed Event Analysis Submitted ‎ (← links)
  • 05000298/LER-1982-009, Forwards LER 82-009/03L-0.Detailed Event Analysis Submitted ‎ (← links)
  • 05000298/LER-1982-005, Amended LER 82-005/03X-1:on 820221,surveillance Test Indicated MSIV 86A Had Closing Time Faster than Allowed by Tech Specs.Caused by Loss of Nitrogen Preload & Fluid from Hydraulic Sys Accumulator.Accumulator Recharged & Tested ‎ (← links)
  • 05000298/LER-1982-020, Forwards LER 82-020/03L-0.Detailed Event Analysis Submitted ‎ (← links)
  • 05000298/LER-1982-018, Forwards LER 82-018/03L-0.Detailed Event Analysis Submitted ‎ (← links)
  • 05000298/LER-1982-019, Forwards LER 82-019/03L-0.Detailed Event Analysis Submitted ‎ (← links)
  • 05000298/LER-1982-017, Forwards LER 82-017/03L-0.Detailed Event Analysis Submitted ‎ (← links)
  • 05000298/LER-1982-016, Forwards LER 82-016/03L-0.Detailed Event Analysis Submitted ‎ (← links)
  • 05000298/LER-1980-051, Forwards LER 80-051/03L-0 ‎ (← links)
  • 05000298/LER-1982-015, Forwards LER 82-015/03L-0.Detailed Event Analysis Submitted ‎ (← links)
  • 05000298/LER-1982-023, Forwards LER 82-023/03L-0.Detailed Event Analysis Submitted ‎ (← links)
  • 05000298/LER-1983-001, Forwards LER 83-001/03L-0.Detailed Event Analysis Submitted ‎ (← links)
  • 05000298/LER-1983-002, Forwards LER 83-002/03L-0.Detailed Event Analysis Submitted ‎ (← links)
  • 05000298/LER-1978-039, Forwards LER 78-039/03L-0 ‎ (← links)
  • 05000298/LER-1978-038, Forwards LER 78-038/03L-0 ‎ (← links)
  • 05000298/LER-1983-013, Forwards LER 83-013/03L-0.Detailed Event Analysis Encl ‎ (← links)
  • 05000298/LER-1982-026, Forwards LER 82-026/03L-0.Detailed Event Analysis Submitted ‎ (← links)
  • 05000298/LER-1994-029, Informs NRC That Plant Will Not Be Submitting LER 94-029. Number Internally Assigned to Potentially Reportable Condition That Later Determined Not Reportable ‎ (← links)
  • 05000298/LER-1983-004, Forwards LER 83-004/03L-0.Detailed Event Analysis Submitted ‎ (← links)
  • 05000298/LER-1983-003, Forwards LER 83-003/03L-0.Detailed Event Analysis Submitted ‎ (← links)
  • 05000298/LER-1992-003, Provides Supplemental Info on Rev 0 to LER 92-003 Re Degradation in safety-related Battery Cells,Per NRC Info Notice 89-017.Existing Monitoring of Battery Cells Provides Ample Advanced Notification of Need to Replace Cells ‎ (← links)
  • 05000298/LER-1978-029, Forwards LER 78-029/03L-0 ‎ (← links)
  • 05000298/LER-1978-030, Forwards LER 78-030/03L-0 ‎ (← links)
  • 05000298/LER-1992-019, Forwards Corrected LER 92-019-00,including Event Date Inadvertently Omitted from 930128 Memo ‎ (← links)
  • 05000298/LER-1988-008, Forwards LER 88-008 & Rev 1 to LER 88-016 ‎ (← links)
  • 05000298/LER-2023-002-01, Secondary Containment Differential Pressure Perturbation Exceeds Technical Specifications ‎ (← links)
  • 05000298/LER-2024-005, High Pressure Coolant Injection Pressure Switch Installation Causes Condition That Could Have Prevented Fulfillment of a Safety Function and a Condition Prohibited B Technical ‎ (← links)
  • 05000298/LER-2024-004, Main Turbine Stop Valve Position Switches Do Not Meet Channel Independence Criteria Results in Two Channels Being Declared Inoperable and a Condition Prohibited by Technical Specifications ‎ (← links)
  • 05000298/LER-2024-003, High Pressure Coolant Injection Steam Leak Causes Condition That Could Have Prevented Fulfillment of a Safety Function and a Condition Prohibited by Technical Specifications ‎ (← links)
  • 05000298/LER-2024-002, Technical Specifications Prohibited Condition for Inoperable Service Water Booster Pump ‎ (← links)
  • 05000298/LER-2024-001, Inoperable Turbine Stop Valve Limit Switch Causes Condition Prohibited by Technical Specifications ‎ (← links)
  • 05000298/LER-2023-002, Secondary Containment Differential Pressure Perturbation Exceeds Technical Specifications ‎ (← links)
  • 05000298/LER-2022-002-01, Manual Core Spray Injection to Restore Skimmer Surge Tank Level ‎ (← links)
  • 05000298/LER-2022-004-01, 1 for Cooper Nuclear Station, Manual Reactor Scram and Group I Isolation Due to Main Turbine Bypass Valve Failing Open ‎ (← links)
  • 05000298/LER-2023-001, Valve Test Failures Result in Condition Prohibited by Technical Specifications ‎ (← links)
  • 05000298/LER-2022-004, Manual Reactor Scram and Group I Isolation Due to Main Turbine Bypass Valve Failing Open ‎ (← links)
  • 05000298/LER-2022-003, Actuation of Reactor Protection System Initiates a Full Reactor Scram ‎ (← links)
  • 05000298/LER-2022-002, Manual Core Spray Injection to Restore Skimmer Surge Tank Level ‎ (← links)
  • 05000298/LER-2022-001, Secondary Containment Differential Pressure Perturbation Exceeds Technical Specifications Limit ‎ (← links)
  • 05000298/LER-2021-003, Re Failure of High Pressure Coolant Injection Flow Indicating Switch Results in Condition Prohibited by Technical Specifications ‎ (← links)
  • 05000298/LER-2021-002, Valve Test Failures Result in Condition Prohibited by Technical Specifications ‎ (← links)
  • 05000298/LER-2021-001, Secondary Containment Differential Pressure Perturbation Exceeds Technical Specifications ‎ (← links)
  • 05000298/LER-2020-004, Secondary Containment Differential Pressure Perturbation Could Have Prevented Fulfillment of a Safety Function ‎ (← links)
  • 05000298/LER-2020-003, Manual Reactor Scram Due to Digital Electro-Hydraulic Fluid Leak ‎ (← links)
  • 05000298/LER-2020-002, Secondary Containment Differential Pressure Perturbation Results in Potential Loss of Safety Function ‎ (← links)
  • 05000298/LER-1998-007, :on 980526,missed Surveillance Testing of Main Turbine Stop Valve Closure,Was Discovered.Caused by Failure to Effectively Implement TS Amend.Main Turbine Stop Valve Closure Scram Function Verified Operable ‎ (← links)
  • 05000298/LER-1996-009, :on 960725,App R Safe Shutdown Analysis Vulnerabilities Were Noted.Caused by Human Error.Performed Procedural Changes & Circuit Mods Were Made ‎ (← links)
  • 05000298/LER-1989-015, :on 890503,discovered That Safety/Relief Valve Setpoint Variance Not within Tech Spec Limit.Caused by Corrosion Bonding of Pilot Disc to Seat & Setpoint Drift. Valves Inspected,Refurbished & Tested ‎ (← links)
  • 05000298/LER-1989-014, :on 890424 & 26,unplanned Actuation of Group 6 Isolation Occurred.Caused by Loose Terminal Board Connection.Loose Terminal Board Connection Retightened ‎ (← links)
  • 05000298/LER-1998-005, :on 980405,discovered That APRM Sys High Flux RPS Trip Set Point,Not Being Functionally Tested,Per Requirements of CNS Tss.Caused by Deficiency in Surveillance Procedures.High Flux Trip Set Point Test Procedures Revised ‎ (← links)
  • 05000298/LER-1989-013, :on 890414,Div I Groups 2,3 & 6 Isolations Occurred Resulting in Closure Signals to Inboard Primary & Secondary Containment Isolation Valves.Caused by Human Factors Deficiencies.Wires Reconnected ‎ (← links)
  • 05000298/LER-1989-024, :on 890731,crack in Diesel Generator Injection Pump Pedestal Found During Surveillance Testing.Caused by Unusual Hydraulic Forces Created by Lube Oil Trapped in Pedestal.Tubing Inserted in Bearing Oil Port ‎ (← links)
  • 05000298/LER-1989-010, :Diesel Generator Room Ambient Temp Control Inadequacies Identified During NRC Insp on 870511-0619. Caused by Error in Original Plant Design.Design Change 87-132 Provided Permanent Mod to Eliminate Deficiency ‎ (← links)
  • 05000298/LER-1989-009, :Svc Water Sys Inservice Testing Concerns Identified During NRC Insp on 870511-0619.Cause Not Stated.Inservice Testing Program Procedure for Pump Testing,Providing Specific Trending Guidance,Upgraded ‎ (← links)
  • 05000298/LER-1989-008, :Insufficient Operator Guidance to Assure Adequate Svc Water Flow During Design Basis LOCA Identified During NRC Insp on 870511-0619.Caused by Procedural Deficiency.Procedures Revised ‎ (← links)
  • 05000298/LER-1989-007, :on 890217 Svc Water Sys Flowrate Concerns Associated W/ Original Sys Design Identified During NRC Insp NRC Insp on 870511-0619.Caused by Inadequate Design. Reduction of Diesel Generator Room Temps Being Pursued ‎ (← links)
  • 05000298/LER-1989-006, :Control Bldg HVAC Design Concerns Identified During NRC Insp on 870511-0619.Caused by Inadequate Design. Steps to Install Permanent Essential Equipment That Will Provide Acceptable Room Temps Being Pursued ‎ (← links)
  • 05000298/LER-1989-005, :Ac Voltage Regulation Concerns Identified During NRC Insp on 870511-0619.Caused by Inadequate Design. Design Change 88-263 Will Install Annunciation on 69 Kv Line to Alert Operator If Line Voltage Cannot Support ECCS ‎ (← links)
  • 05000298/LER-1989-004, :on 890216,emergency Diesel Generator Trouble Alarm Received Due to Inadvertent Actuation of Safety Shutdown Valve Overspeed Trip Lever.Caused by Personnel Error.Responsible Supervisor Counseled ‎ (← links)
  • 05000298/LER-1998-006, :on 980402,SRVs Were Found Outside TS Limiting Safety Sys Setting.Caused by Corrosion Bonding of Pilot Disc to Pilot Seat.Removed SRV from Svc & Tested Utilized Pilot Discs ‎ (← links)
  • 05000298/LER-1989-011, :on 890220,as-found Differential Pressure for RHR Pumps a & C Found Above Required Action Level.Caused by Personnel error.On-duty Shift Supervisor Counseled & Shift Supervisors Required to Review Procedures ‎ (← links)
  • 05000298/LER-1989-022, :on 890613,condition Identified That Could Have Rendered Both Trains of Standby Gas Treatment Sys Inoperable Due to Single Component Failure.Caused by Not Considering All Potential Failure Modes.Mod Made ‎ (← links)
  • 05000298/LER-1989-012, :on 890407,actuation of ESF Group Isolations Occurred Subsequent to Planned Manual Scram.Caused by design.State-of-the-art Digital Turbine Control Sys Being Installed ‎ (← links)
  • 05000298/LER-1989-021, :on 890602,undocumented Wiring Configurations Associated w/safety-related Equipment Discovered During Implementation of Design Change 87-190.Caused by Existence of Unexpected GE Supplied Subj Configurations ‎ (← links)
  • 05000298/LER-1989-023, :on 890522,during Insps,Wall Thickness Below Required Design Min Observed on RHR Loop a Injection Throttle Valve.Caused by Erosion Due to Throttling.Wall Thickness Measurements Performed More Often ‎ (← links)
  • 05000298/LER-1989-020, :on 890529,power to 416 Volt 1F Critical Bus Lost,During Acceptance Testing of Design Change,Resulting in Unplanned Actuations of Group 2,3,6 & 7 Isolations.Caused by Design Inadequacies.Isolations Reset ‎ (← links)
  • 05000298/LER-1989-019, :on 890524 & 0609,Group 1,3 & 6 Isolations Occurred Due to Design Change Activities.Caused by Human Factors & Communications Deficiencies.Further Guidance Incorporated in Dc Instructions ‎ (← links)
  • 05000298/LER-1989-018, :on 890518,unplanned Scram & Containment Isolations While Shutdown Occurred Due to Loss of Power to Reactor Protection Sys Trip Sys B.Caused by Inadequate Preventive Maint.Trip Sys Reenergized ‎ (← links)
  • 05000298/LER-1986-026, :on 861011,cracks Discovered in Fire Dome Area of 12 Cylinder Heads on Emergency Diesel Generator DG-2. Cause Attributed to Cylinder Head Design.New Cylinder Heads Received & All Cracked Heads Replaced ‎ (← links)
  • 05000298/LER-1989-016, :on 890510,core Spray B Sys Inadvertently Started & Injected Approx 500 Gallons Into Reactor Vessel. Caused by Electrician Installing Blocks on Wrong Relay Contacts.Injection Terminated ‎ (← links)
  • 05000298/LER-1989-017, :on 890511,standby Liquid Control Sys Squib Valve a Failed to Actuate During Testing.Caused by Inadequate Design Change Instructions Associated W/ Disconnecting Valves.Shunt Removed from Pins ‎ (← links)
  • 05000298/LER-1987-018, :on 870806,automatic Startup of Both Diesel Generators Occurred.Caused by Lightning Strike on Offsite 69 Kv Emergency Power Supply Sys.Transmission Line Restored & Evaluation Continuing ‎ (← links)
  • 05000298/LER-1998-008, :on 980804,TS Violation Was Noted Due to Missed Testing of RB Suppression Chamber Vacuum Breakers.Caused by Misinterpretation of Ts.Valves Tested IAW TS Requirements ‎ (← links)
  • 05000298/LER-1987-025, :on 871128,determined That motor-operated Valve Installed to Bypass Drywell Exhaust Inboard Isolation Valve Would Remain in Existing Position Upon Loss of Power.Design Change Will Be Implemented ‎ (← links)
  • 05000298/LER-1987-024, :on 871106,HPCI Turbine Overspeed Trip Mechanism Failed to Automatically Reset During Testing Due to Binding of Tappet Assembly.Trip & Reset Function Checked Periodically Until Actions Received from GE ‎ (← links)
  • 05000298/LER-1997-010, :on 970713,standby Gas Treatment Inoperability Was Noted.Caused by Design Deficiency.Surveillance Procedure 6.SUMP.101 Will Be Performed on Periodic Basis ‎ (← links)
  • 05000298/LER-1997-010-02, Forwards LER 97-010-02 Restandby Gas Treatment Inoperability Due to Design Deficiency.Rev Provides Addl Info on Safety Significance of Event ‎ (← links)
  • 05000298/LER-1987-017, :on 870707,both Diesel Generators Automatically Started When Lightning Strike Resulted in Loss of 69 Kv Transmission Line.Damaged Arrestors Repaired ‎ (← links)
  • 05000298/LER-1987-023, :on 870414,Barksdale Bourdon Tube Pressure Switch Setpoints Drifted.Caused by Seasonal Environ Variations.Conservative Setpoint Margins Established.W/ ‎ (← links)
  • 05000298/LER-1989-003, :on 890213,emergency Diesel Generator Manually Shutdown & Declared Inoperable Due to Air Leak in 30 Psig Control Air Header.Caused by Inadequate Design Control. Supports Added & Tubing Rerouted to Minimize Cyclic Stress ‎ (← links)
  • 05000298/LER-1987-022, :on 870512,inlet Isolation Valve RWCU-MO-15 Unexpectedly Closed,Isolating RWCU Sys.Caused by Personnel Error.Rwcu Sys Placed Back in Svc.Evaluation of Event Conducted & Surveillance Procedure Revised ‎ (← links)
  • 05000298/LER-1989-002, :on 890131,unplanned Actuation of Reactor Protection Sys & Groups 2,3 & 6 Isolations Occurred.Caused by Inadequate Job Planning & Lack of Concentration on Task. Plant Sys Restored to Prior Mode of Operations ‎ (← links)
  • 05000298/LER-1987-021, :on 840624,850503,24,0730 & 0816 Unplanned Actuations of Automatic Diesel Generators Occurred W/O Being Reported.Caused by Past Understanding of Term ESF Actuation as Applied to Diesel Generators ‎ (← links)
  • 05000298/LER-1989-001, :on 890125,automatic Reactor Scram Due to High Neutron Flux Occurred.Caused by Stem Disc Separation & Seating of Main Disc Resulting in Pressure Spike.Inboard & Outboard MSIVs Refurbished ‎ (← links)
  • 05000298/LER-1987-020, :on 870827,discovered That Annual Insps Performed in 1984 Not Accomplished within 15 Months.Caused by Misunderstanding of Term Annual. Definition of Testing Intervals & Procedural Changes Made ‎ (← links)
  • 05000298/LER-1987-019, :on 870808,plant Shutdown Initiated Due to Malfunctioning Pressure Suppression Chamber & Reactor Bldg Vacuum Breaker Valves.Caused by Valve CV-13 Not Being Fully Seated.Surveillance Procedure Changed ‎ (← links)
  • 05000298/LER-1997-011, :on 970729,util Declared Primary Containment Inoperable & Initiated Plant Shutdown,Per TS 1.0.J.Caused by Result of Failure to Maintain Vacuum Breakers in Accordance W/Quality Program.Refurbished Vacuum Breakers ‎ (← links)
  • 05000298/LER-1998-002, :on 980302,determined That off-gas Fan & Filter Bldg Was Not Installed IAW Design Requirements.Caused by Bracing Overlooked Due to Lack of or Less than Adequate Const Insps.Required Bracing Installed ‎ (← links)
  • 05000298/LER-1999-007, :on 990917,inoperable Sump Z Resulted in TS Required Shutdown.Caused by Inadequate Conduit Seal & Deficient Operating Procedure.Necessary Repairs Were Made & Deficient Procedure Was Revised.With ‎ (← links)
  • 05000298/LER-1997-009-01, Forwards LER 97-009-01,clarifying Length of Time That a RPS Bus Was Supplied from Alternative Power Source.Info Supplied on Issue in Original LER Was Unclear & Subject to Misinterpretation ‎ (← links)
  • 05000298/LER-1997-012, :on 970804,discovered That Suppression Pool Level Risen to Nearly 3 Inches Above Normal Water Level. Caused by Inadequate Operations Crew Supervisory Oversight. Lowered Suppression Pool Vol to Below TS Limit ‎ (← links)
  • 05000298/LER-1998-004, :on 980311,average Range Power Monitors Not Tested.Caused by Failure to Effectively Implement TS Amend. Procedure Will Be Revised by 980602,prior to Next Startup, Whichever Comes First ‎ (← links)
  • 05000298/LER-1998-003, :on 980312,potential Loss of Safety Function Noted Due to Inadequate Procedure.Caused by Failure to Establish Processes to Ensure Appropriate Translation of Safety Analysis Inputs.Procedures Revised ‎ (← links)
  • 05000298/LER-1986-022, :on 861004,primary Containment Isolation & Reactor Protection Sys Trip Occurred During Manual Scram in Preparation for Outage.Caused by Procedural Inadequacy. Procedure Revised ‎ (← links)
  • 05000298/LER-1986-025, :on 861003,diesel Generator 2 Inadvertently Autostarted.Caused by Electrician Accidentally Bumping Relay 30-1/1BN.Occurrence Discussed W/Personnel Involved ‎ (← links)
  • 05000298/LER-1986-024, :on 861004,RWCU Group III Isolation Occurred on High Sys Flow.Caused by Procedural Deficiency.Rwcu Sys Lineup Reestablished.Procedure Will Be Revised ‎ (← links)
  • 05000298/LER-1986-023, :on 861004,ESF Unnecessarily Operated.Caused by Discrepancy in Wiring of Power Transfer Relays from Drawing. Evaluation of Wiring Configuration for Proper Breaker Operation Underway ‎ (← links)
  • 05000298/LER-1987-015, :on 870521,unplanned Group 1 Isolation & Reactor Scram Occurred Due to Overtravel of Reactor Mode Switch When Operated.Caused by Personnel Error.Mode Returned to Refuel Position & Group 1 Isolation Reset ‎ (← links)
  • 05000298/LER-1987-016, :on 870526,unplanned Automatic Startup of Both Diesel Generators Occurred Due to Momentary Undervoltage Condition.Possibly Caused by Lightning Strike on 69kV Emergency Transformer.Generators Restored ‎ (← links)
  • 05000298/LER-1987-014, :on 870518,during Plant Startup After Unscheduled Shutdown,High Reactor Water Conductivity Led to Manual Scram.Caused by Main Condenser Tube Leakage.Tube Leak Checking & Plugging of Faulty Tubes Completed ‎ (← links)
  • 05000298/LER-1987-012, :on 870517,during Testing of MSIV Primary Containment Isolation Sys,Group I Isolation Occurred.Caused by Removal of Incorrect Fuse.Individual Counseled on Importance of Following Procedures ‎ (← links)
  • 05000298/LER-1987-013, :on 870518,bus 4160V 1G Inadvertently Deenergized Due to Loss of Voltage During Transfer of Power from Startup to Normal Source.Cause Unknown.Investigation Conducted.No Furtherinvestigation Planned ‎ (← links)
  • 05000298/LER-1986-034, :on 861118,discovered That New Fuel Stored in Spent Fuel Storage Pool Contained U-235 Loading in Excess of Tech Specs.Caused by Newer GE-designed Pellets W/Higher Density.Design Will Be Reviewed ‎ (← links)
  • 05000298/LER-1987-011, :on 870517,while Conducting Monthly Turbine Valve Testing,Unplanned Actuation of Reactor Protection Sys & Containment Isolation Valve Groups 2,3 & 6 Initiated. Caused by Personnel Error.Procedure Revised ‎ (← links)
  • 05000298/LER-1986-031, :on 861109,unplanned Actuation of Groups II & VI Containment Isolation Circuitry Occurred,Resulting in Isolation of Primary & Secondary Containment & Tripping of Reactor Bldg Ventilation Sys.Circuits Reset ‎ (← links)
  • 05000298/LER-1986-018, :on 860818,reactor Water Not Sampled for Conductivity After Reactor Recirculation Sys Inboard Sample Valve Declared Inoperable Due to Failed Solenoid Valve. Caused by Personnel Error.Personnel Counseled ‎ (← links)
  • 05000298/LER-1986-017, :on 860818,HPCI Steam Supply Valve Isolation Challenged During Normal Operation.Caused by Troubleshooting W/Inadequate Guidance.Instrument & Control Supervisor Emphasized Need for Preplanning to Personnel ‎ (← links)
  • 05000298/LER-1986-030, :on 861027,emergency Diesel Generator 1 auto-started.Caused by Personnel Error When Station Emergency Svc Transformer Auxiliary Undervoltage Relay Accidently Bumped.Procedures Revised ‎ (← links)
  • 05000298/LER-1986-016, :on 860813,reactor Scram Occurred.Caused by Lack of Proper Preplanning for Relay Replacement & Specific Procedural Guidance.Need for Preplanning of Maint Activities Reemphasized ‎ (← links)
  • 05000298/LER-1986-015, :on 860812,ESF Emergency Diesel Generator Start Challenged Due to 69 Kv Power Supply Substation Breaker Cycling.Caused by Fault Signal Due to Lightning.Generators Secured ‎ (← links)
  • 05000298/LER-1986-029, :on 861025,ESF (Emergency Diesel Generator Start) Challenged Due to Loss of 69 Kv Power Supply to Station Emergency Transformer.Caused by Damaged Insulator, Apparently Shot by Hunters ‎ (← links)
  • 05000298/LER-1986-028, :on 861021,58 Out of 88 Seismic Class Is Supports on Standby Gas Treatment Sys Suction Ductwork Found Structurally Inadequate.Caused by Undocumented Design Changes.Mods Immediately Initiated ‎ (← links)
  • 05000298/LER-1986-001, :on 860127,ESF Primary Containment Isolation Sys Group III Isolation Challenged.Caused by Repositioned Setpoint on RWCU Nonregenerative HX Outlet Temp Indicating Switch.Setpoint & Isolation Reset ‎ (← links)
  • 05000298/LER-1987-001, :on 870101,two Separate Reactor Scrams Occurred Due to Actuation of Reactor Protection Sys High Pressure Scram Logic.Caused by Procedural Inadequacy.Inservice Leak Test Procedure Revised ‎ (← links)
  • 05000298/LER-1986-035, :on 861226,unplanned Actuation of Rcwu Isolation Logic Occurred,Resulting in Isolation of Rcwu Sys. Caused by Personnel Error While Troubleshooting Problem W/Rcwu Sys Temp Sensors.Personnel Counseled ‎ (← links)
  • 05000298/LER-1997-013, :on 960807,plant Was Noted Outside Design Basis Due to Inadequate Scram Discharge Volume Mod.Inadequate Design Review May Have Caused Condition.Cause Is Unknown. Implemented Mod MP96-121 in May 1997 ‎ (← links)
  • 05000298/LER-1987-008, :on 870127,reactor Bldg Ventilation Exhaust Radiation Monitor Tripped Causing Group VI Isolation.Caused by Personnel Error Due to Poor Communications & Procedural Deficiencies.Technician Counseled ‎ (← links)
  • 05000298/LER-1986-013, :on 860617,during Operation at 18% Power, Primary Containment Integrity Breached When Maint Team Exited Drywell W/O Inner Airlock Door Fully Seated.Caused by Personnel Error ‎ (← links)
  • 05000298/LER-1986-032, :on 861110,one Valve Determined to Actuate at Pressure of 4 Psi Lower than Allowable.Caused by Setpoint Drift.Corrective Action Included Normal Refurbishment Activities & Certification Testing ‎ (← links)
  • 05000298/LER-1999-006, :on 990727,inadvertent half-group VII Isolation Was Noted.Caused by Deenergization of Relay.Reset PCIS-REL-K65 Relay & half-group VII Isolation ‎ (← links)
  • 05000298/LER-1986-021, :on 860922,emergency Diesel Generator Start ESF Challanged Due to Loss of 69 Kv Power Supply to Transformer. Caused by Inadvertent Removal from Svc During Offsite Switching Activities.Power Restored ‎ (← links)
  • 05000298/LER-1986-020, :on 860918,69-kV Power Supply Circuit Breaker Cycled Open & auto-closed.Caused by Fault Signal Due to Lightning During Severe Storm.Emergency Diesel Generators Secured ‎ (← links)
  • 05000298/LER-1986-019, :on 860912,Group III Isolation Occurred, Closing RWCU Sys Primary Containment Isolation Valves.Caused by Procedural Deficiency.Station Procedure 2.2.66 Revised & Event Discussed W/Personnel ‎ (← links)
  • 05000298/LER-1987-005, :on 870110,while Primary Containment Inerting in Progress,Reactor Scram Occurred Due to Closure of Msivs. Caused by Inadequate Procedural Guidance.Operating Alarm Procedures Will Be Revised ‎ (← links)
  • 05000298/LER-1987-006, :on 870110,second Reactor Scram Occurred Due to Low Reactor Pressure Vessel Water Level.Caused by Personnel Error.Reactor Vessel Water Level Recovered & Stabilized Using RCIC Sys ‎ (← links)
  • 05000298/LER-1987-007, :on 870110,second RWCU Isolation Occurred Due to High Sys Flow.Caused by Isolation Valve Throttle Opening Too Rapidly Due to Failed Amplifier RWCU-PI-131.Rept Will Be Written to Study Root Cause of Failure ‎ (← links)
  • 05000298/LER-1986-005, :on 860227,HPCI Sys Declared Inoperable After Gasket Failure on Gland Steam Condenser.Caused by Condensate Leakage Through Condenser Top head-to-shell Joint Gasket. Condenser Repaired ‎ (← links)
  • 05000298/LER-1986-006, :on 860227,reactor Trip Occurred During Special Procedure on Reactor Feedwater Control Sys.Caused by Removal of Pump W/Failed Fuse from Svc.Rev 2 to Special Order 86-01 Issued to Provide Feed Pump Operation Guidance ‎ (← links)
  • 05000298/LER-1986-004, :on 860227,ESF,primary Containment Isolation Sys Group III Isolation Challenged During Cooldown.Caused by RWCU High Sys Flow of No More than 200%.RWCU Sys Lineup Reestablished & Sys Returned to Svc ‎ (← links)
  • 05000298/LER-1987-004, :on 870108,excessive Leak Rate Found in Main Feedwater Check Valves RF-CV-16CV,15CV,14CV & 13CV.Caused by Overestimated Lifetime of Seat Ring Matl.New Seat Rings Installed Seating Surface Lapped ‎ (← links)
  • 05000298/LER-1987-003, :on 870107,reactor Scram & Group Isolations Occurred Due to Low Reactor Vessel Level During Troubleshooting.Caused by Insufficient Acceptance Test. Terminal Connections Verified ‎ (← links)
  • 05000298/LER-1987-002, :on 870104,reactor Scram Occurred During Startup.Caused by Personnel Error.Event Discussed W/All Licensed Shift Operating Personnel ‎ (← links)
  • 05000298/LER-1987-010, :on 870328,diesel Generators 1 & 2 Automatically Started Due to Undervoltage Condition on Emergency Transformer.Caused by Momentary Interruption of 69 Kv Transmission Line Due to Snow Storm ‎ (← links)
  • 05000298/LER-1999-005, :on 990601,condition Prohibited by TSs Was Noted.Caused by Failure to Adequately Perform Logic Sys Functional Testing.Entered TS SR 3.0.3 & Temporarily Revised Affected Surveillance Procedures ‎ (← links)
  • 05000298/LER-1999-004, :on 990426,SRVs Were Found Outside TS Safety Function Lift Setpoint.Caused by Sufficient Corrosion Bonding.Srv Pilot Valve Assemblies Removed for Testing Were Replaced ‎ (← links)
  • 05000298/LER-1999-004-01, Forwards LER 99-004-01.Commitments Made by Util Are Encl ‎ (← links)
  • 05000298/LER-1987-009, :on 870218,reactor Scram Occurred Accompanied by Groups Ii,Iii & VI Isolations When Operating Reactor Feed Pump Mistakenly Tripped by Station Operator.Caused by Personnel Error.Error Reviewed W/Personnel ‎ (← links)
  • 05000298/LER-1999-002, :on 990406,determined That Four of Eight of RPS Scram Relays Were Not Being Response Time Tested as Required by TS 3.3.1.1.15.Caused by Inadequate Translation of Testing Requirements.Surveillance Procedure Revised.With ‎ (← links)
  • 05000298/LER-1986-011, :on 860510,closure of Stop Valve 2 Did Not Result in Turbine Stop Valve Closure Half Scram During Sp 6.1.7.Caused by Disconnected Linkage Between Valve Actuator & Reactor Protection Sys Limit Switches ‎ (← links)
  • 05000298/LER-1986-010, :on 860415,radioactive Matl in Excess of 10CFR30.18 Limits Released to Unrestricted Area.Caused by Not Performing Survey of Matls Prior to Release for Unrestricted Use.Procedures Upgraded ‎ (← links)
  • 05000298/LER-1988-023, :on 880916,RWCU Sys Valve Closed (Group 3 Isolation) Due to Relay Failure.Caused by Relay Coil Reaching Reasonable Lifetime for Normal Energized Relay. Failed Relay Coil Replaced ‎ (← links)
  • 05000298/LER-1999-001, :on 990222,failure to Recognize Set Point Shift Caused Common Mode Failure of HPCI Pressure Switches. Pressure Switches Were Recalibrated & Returned to Svc & Operability Evaluation Performed ‎ (← links)
  • 05000298/LER-1978-035-01, /01T-0 on 781124:while Checking RR MG Set 1B Speed control,1 Amp fuse(F2) in Drive Amplifier Circuit Was Pulled Out & Checked.Caused Rapid Increase in Pwr Level,Tripping RR MG Set 1B ‎ (← links)
  • 05000298/LER-1978-035, Forwards LER 78-035/01T-0 ‎ (← links)
  • 05000298/LER-1998-013-01, Forwards LER 98-013-01 Re Missed Surveillance of Secondary Containment Isolation Valve.List of NRC Commitments Encl ‎ (← links)
  • 05000298/LER-1986-014, :on 860718,inadvertent Isolation of RWCU Sys Occurred.Caused by Air in Low Pressure Instrument Sensing Line.Air Purged from Line & Surveillance Procedure Performed Satisfactorily ‎ (← links)
  • 05000298/LER-1998-001, :on 980127,discovered That Closing SGTS Unit Crosstie Valve During Performance of Certain Surveillance Test Procedures Renders Both Trains Inoperable.Caused by Failure to Recognize.Procedures Revised ‎ (← links)
  • 05000298/LER-1986-007, :on 860311,setpoint for Main Steam Line High Flow Primary Containment Isolation Determined to Have Been Based on Design Vs Rated Flow.Approval for Tech Spec Change & Temporary Waiver Granted by NRC ‎ (← links)
  • 05000298/LER-1998-012, :on 981217,overspeed Trip of HPCI & RCIC Sys During 150 Lbs Vessel Pressure Test Was Noted.Caused by Inadequate Surveillance Procedure.Immediate Action Was Taken to Vent HPCI & RCIC Common Suction Piping.With ‎ (← links)
  • 05000298/LER-1986-012, :on 860610,during Normal Operation,Loss of 69-kV Power Supply to Emergency Transformer Occurred.Caused by Substation Breaker Trip.Power Restored.Emergency Transformer Declared Operable ‎ (← links)
  • 05000298/LER-1998-011, :on 981218,steam Leak at HPCI Turbine Valve Discovered.Caused by Misalignment of Flanges.Flange Gasket Was Replaced,Flange Was Properly Assembled & Surveillance Procedure Was Performed Satisfactorily ‎ (← links)
  • 05000298/LER-1997-019, :on 971222,incorrect Mind Set & Scheduling Process Resulted in TS Violation.Caused by Failure of Shift Supervisor Support.Problem Identification Rept Associated W/ Event Will Be Presented as First Case Study ‎ (← links)
  • 05000298/LER-1997-018, :on 971215,high Pressure Coolant Injection Sys Isolation During Surveillance Testing,Occurred.Caused by Personnel Error.Station Operator Involved Has Been Temporarily Removed from Watch Standing Duties ‎ (← links)
  • 05000298/LER-1998-010, :on 981118,inadvertent Reactor Protection Sys Half Trip Was Noted.Caused by Defective Electrical Protection Assembly Logic Card.Defective Logic Card Was Replaced with Refurbished Card.With ‎ (← links)
  • 05000298/LER-1985-010, :on 851005,Group 1 Isolation Occurred.Caused by Low Main Steam Line Pressure Isolation Signal W/Reactor Mode Switch in Run Due to Personnel Error.Personnel Counseled ‎ (← links)
  • 05000298/LER-1997-017, :on 960724,plant Was Outside Design Basis. Caused by Inadequate Original Design.Outboard Valves Were de-energized in Closed Position ‎ (← links)
  • 05000298/LER-1997-016, :on 971210,DG Test Did Not Meet Minimum Time Requirements.Caused by Incorrect TS Interpretation. Applicable Surveillance Procedures Were Put on Administrative Hold ‎ (← links)
  • 05000298/LER-1988-016, :on 880517,pipe Support Design Deficiencies Discovered During Design Change Engineering Activities. Caused by Design Deficiency.Hpci Pump Discharge Sys Modified to Bring Supports Up to Code Qualification ‎ (← links)
  • 05000298/LER-1988-003, :on 880128,RHR Pump B Motor Ground Alarm Received W/Pump in Svc Prior to Scram.Exact Cause of Worn Insulation Unknown.Replacement Motor Obtained & Installed as Authorized by Design Change 88-071 ‎ (← links)
  • 05000298/LER-1997-002, :on 970409,SRVs Were Found Outside TS Limiting Safety Sys Setting.Caused by Corrosion Bonding of Pilot Disc to Pilot Seat.New Platinum-Stellite Has Been Installed in All Eight SRVs Prior to Reinstallation ‎ (← links)
  • 05000298/LER-1988-017, :on 880526,two Unplanned Actuations of ESFs Occurred While Performing Revised Surveillance Test to Verify Integrity of All Circuits.Caused by Personnel Error & Human Factors Deficiencies.Personnel Counseled ‎ (← links)
  • 05000298/LER-1988-026, :on 880930,momentary Undervoltage Condition on Emergency Transformer Sensed,Resulting in Auto Startup of Diesel Generators 1 & 2.Cause Unknown.Engineering Evaluation to Be Completed & Necessary Mods Made Prior to Startup ‎ (← links)
  • 05000298/LER-1988-025, :on 880928,Div II Primary & Secondary Containment Isolations Occurred.Caused by Coil Failure of Normally Energized Relay in Reactor & Containment Isolation Logic.Failed Relay Coil Replaced ‎ (← links)
  • 05000298/LER-2020-001, Reactor Building Doors Opened Simultaneously Could Have Resulted in Loss of Safety Function ‎ (← links)
  • 05000298/LER-1988-024, :on 880923,several Group 6 Isolations Occurred Due to Intermittent Tripping of Reactor Bldg B Ventilation Radiation Indicator/Trip Unit.Caused by Defective Zener Diode.Zener Diode Replaced ‎ (← links)
  • 05000298/LER-1998-009, :on 981005,operator Error Resulted in Unexpected Full Scram on High SDV Level While in Mode 5. Caused by Failure to Bypass SDV High Level Trip IAW Operating Procedure.Revised Instructions.With ‎ (← links)
  • 05000298/LER-1988-015, :on 880520,unplanned Actuation of Reactor Protection Sys & ESF Group Isolations Occurred.Caused by Procedural Deficiency.Reactor Protection Sys & Group Isolation Reset & Affected Sys Restored ‎ (← links)
  • 05000298/LER-1988-014, :on 880505,unplanned Group 6 Isolation Occurred Due to Failure of Fuse.Caused by Equipment Failure of Random Nature.Fuse Replaced,Group 6 Isolaton Reset & Normal Reactor Bldg Ventilation Restored ‎ (← links)
  • 05000298/LER-1988-021, :on 880525,reactor Scram & Group 1 & 7 Isolations Occurred.Caused by Signal Spikes on All Four Main Steam Line Radiation Monitors Due to Electrical Noise.Plant Stabilized & Separate Chassis Ground Added to Each Monitor ‎ (← links)
  • 05000298/LER-1988-013, :on 880426,unplanned Actuations of Group 2 & 6 Isolations Occurred During Performance of Reactor Protection Sys Relay Maint.Caused by Personnel Error.Neutral Bus Bar Compression Type Connections Checked ‎ (← links)
  • 05000298/LER-1988-011, :on 880418,Group 6 Isolation Occurred While Performing Maint on 24 Volt Dc Battery.Caused by Miscommunication of Clearance Order Requirements & Actual Work to Be Performed on Batteries.Bus Restored ‎ (← links)
  • 05000298/LER-1988-012, :on 880422,partial Group ESF Actuations Occured.Caused by Random Failure of Relay.Relay Replaced, Group 2 & 6 Isolations Reset & Reactor Bldg Ventilation Restored ‎ (← links)
  • 05000298/LER-1988-010, :on 851023,core Spray Suction Valve CS-M0V-M07B Failed to Close During Surveillance Testing.Caused by Incorrect Pinion Gear Orientation in Motor Operator.Insp of All Limitorque Operators Installed Performed ‎ (← links)
  • 05000298/LER-1988-009, :on 880407,setpoint Variance & Operability Concerns Associated W/Safety Relief Valves Discovered.Caused by Gasket Malfunction.Valves Inspected & Refurbished ‎ (← links)
  • 05000298/LER-1988-020, :on 880801,discovered That Surveillance Procedure for HPCI Pump Low Suction Pressure Calibr & Functional Test Not Performed within Required Surveillance Interval.Caused by Personnel Error ‎ (← links)
  • 05000298/LER-1988-007, :on 880325,two Unplanned Actuations of Reactor Protection Sys Group Isolations Occurred.Caused by Incorrect Field Drawings During Development of Work Instructions.Sys Restored to Pretripped Configuration ‎ (← links)
  • 05000298/LER-1988-019, :on 880715,reactor Manually Scrammed Subsequent to Discovery of Electrical Arcing at Bolted Connection Between Removable Covers of Isolated Phase Bus Duct.Caused by Broken Ground Strap.Sys Restored to Svc ‎ (← links)
  • 05000298/LER-1985-019, :on 851127,primary Containment Isolation Sys Group III Isolation Challenged.Caused by RWCU Nonregenerative HX High Outlet Temp of 140 F.Operating Procedure 2.2.65 Revised ‎ (← links)
  • 05000298/LER-1988-005, :on 880305,RWCU Sys Isolation Occurred When RWCU Pump Lost Required Npsh.Caused by Sys Design Re Margin Existing for RWCU Pump Npsh.Engineering Evaluation Performed to Determine Feasibility of Implementation Mod to RWCU Sys ‎ (← links)
  • 05000298/LER-1988-006, :on 880316,unplanned Automatic Actuation of Diesel Generator 1 Starting Logic Occurred.Caused by Target Reset Lever Inadvertently Contacting Overcurrent Relay seal-in Contacts.Relay Removed & Inspected ‎ (← links)
  • 05000298/LER-1988-004, :on 880305,actuation of ESF Group Isolations Occurred Subsequent to Planned Manual Scram.Caused by Plant Design.Reactor Vessel Water Level Immediately Recovered & Plant Sys Restored to Normal Condition ‎ (← links)
  • 05000298/LER-1988-018, :on 880609,inadvertent Injection of Water Into Reactor Vessel During Surveillance Test.Caused by Listed Items Including,Inadequate Procedure.Injection Terminated & Surveillance Procedure Revised ‎ (← links)
  • 05000298/LER-1978-031-03, /03L-0 on 780912:Cooper-Bessemer Diesel Engine Type KSV-16-T Main Bearing Overheated.Main Bearing 10 Was Damaged Due to Minimal Oil Flow During Engine Coastdown. Caused by Foreign Particles in Oil ‎ (← links)
  • 05000298/LER-1978-031, Forwards LER 78-031/03L-0 ‎ (← links)
  • 05000298/LER-1978-033-03, /03L-0 on 781016:cable HP58,Div 1,was Found Routed Thru Div 11 Riser Under Panel 9-3.Caused by Personnel Error During Constr.Redundant Sys Were Operable ‎ (← links)
  • 05000298/LER-1978-033, Forwards LER 78-033/03L-0 ‎ (← links)
  • 05000298/LER-1978-032-03, /03L-0 on 780918:during Normal Oper,After Cooling Down the Torus,Rhr Heat Exchanger 1B Bypass RHR-MO-66B Failed to Oper,Due to Loose Set Screw on Yoke of Limiterque SMB-3 Operator ‎ (← links)
  • 05000298/LER-1978-032, Forwards LER 78-032/03L-0 ‎ (← links)
  • 05000298/LER-1997-007, :on 970614,while Inerting Primary Containment, One of Twelve Torns to Drywell Vacuum Breakers Opened.Caused by Procedural Inadequacy.Procedure 2.2.60 Has Been Revised ‎ (← links)
  • 05000298/LER-1997-004, :on 970506,RT Signal Esfa & Loss of Shutdown Cooling During Maint Activity Occurred.Caused by Personnel Error.Procedures Revised ‎ (← links)
  • 05000298/LER-1997-008, :on 970614,TS 3.7.A.5.d Time Limit Was Exceeded.Caused by Procedural Inadequacy.Revised Operating Procedures 2.2.60 ‎ (← links)
  • 05000298/LER-1978-034-03, /03L-0 on 781111:during S.P.6.4.1.2. (Withdrawn Control Rod Operability), Control Rod 30-31 Was Found Uncoupled from Its Control Rod Drive. Cause Cannot Be Determined Until Control Rod Drive Is Removed & Examined ‎ (← links)
  • 05000298/LER-1978-034, Forwards LER 78-034/03L-0 ‎ (← links)
  • 05000298/LER-1978-029-03, /03L-0:on 780814,core Spray Time Delay Relay Did Not Operate within Required Time Frame.Caused by Type of Relay Used & Inactivity After Repairs.Design Change Will Be Prepared to Replace Relay ‎ (← links)
  • 05000298/LER-1978-030-03, /03L-0:on 780815,13 Primary Containment Penetrations Not Leak Tested.Caused by Penetrations Not Identified During Preoperational Testing.Penetrations Will Be Added to Tech Spec Table 3.7.2 & Will Be Tested ‎ (← links)
  • 05000298/LER-1988-002, :on 880128,reactor Scram Occurred Due to Average Power Range Monitor High Flux.Caused by Locking Screw Used to Secure Disc Loosening & Vibrating Off.Group Isolations Reset & Diesel Generators Secured ‎ (← links)
  • 05000298/LER-1997-003, :on 970423,primary Containment Vent & Purge Sys & Simultaneous Opening of Inlet Purge & Outlet Exhaust Lines Was Determined.Caused by Procedural Noncompliance. Procedure 2.2.6.0 Was Revised ‎ (← links)
  • 05000298/LER-1986-008, :on 860318,emergency Diesel Generator 2 Made Inoperable to Inspect Electrical Breaker Cabinets for Future Design Change Implementation.Reactor Equipment Cooling Pumps a & B Taken Out of Svc for Maint ‎ (← links)
  • 05000298/LER-1997-006, :on 970509,plant Exceeded TS Functional Check Requirement.Caused by Failure to Identify ECCS Instrumentation Surveillance Requirements During Refueling Operations.Missed Surveillances Completed ‎ (← links)
  • 05000298/LER-1997-005, :on 970507,inadvertent Start of DG 1 Occurred While Performing Surveillance Testing.Caused by Inadvertent Contact Between Two Terminals.Operators Secured DG & Verified Logic Function ‎ (← links)
  • 05000298/LER-1986-003, :on 860220,functional Section of Surveillance Procedure 6.1.29 Re APRM Sys Not Performed as Required by Tech Specs.Caused by Rev to Surveillance Testing Schedule. Surveillance Procedure Performed ‎ (← links)
  • 05000298/LER-1985-018, :on 851123,ESF Challenged Due to Trip of RWCU Sys Space Temp Switches.Caused by RWCU Mechanical Pump Seal Failure,Resulting in Steam Leak.Procedure Revised ‎ (← links)
  • 05000298/LER-1985-014, :on 851029,determined That Violation of APRM Flux Trip & Rod Block Monitor Trip Settings Occurred on 850920.Caused by Personnel Error.Revs Made to Related Procedures to Prevent Recurrence ‎ (← links)
  • 05000298/LER-1985-016, :on 851022,during Tour of Primary Containment, NRC Personnel Noted Mechanical Snubber Restricted by Floor Grating.On 851119,during Insp of Outside Containment,Several Seismic Support Discrepancies Found ‎ (← links)
  • 05000298/LER-1985-017, :on 851122,HPCI Sys Deemed Inoperable During Startup Operability Testing After Turbine Outage.Caused When Reactor Pressure Exceeded 113 Psig & Operators Unable to Confirm Opening of Injection Valve Disc ‎ (← links)
  • 05000298/LER-1985-015, :on 851113,reactor Bldg Ventilation Radiation Monitors Inoperable,Preventing Initiation of Group VI Isolation.Caused by Electrical Jumpers Installed in Trip Units.Jumpers Removed ‎ (← links)
  • 05000298/LER-1985-009, :on 850825,steam Inlet Valve to HPCI Failed to Open W/Motor Operator.Caused by Valve Disk Restellited During Outage & Mod of Valve Operator Control Circuitry. Valve Manually Unseated & Stroked ‎ (← links)
  • 05000298/LER-1985-007, :on 850823,HPCI Steam Supply Stop Valve Did Not Open During Daily Operation of HPCI Auxiliary Oil Pump. Caused by Pump Low Suction Pressure Turbine Trip.Pump Pressure Switch Tested & Calibr ‎ (← links)
  • 05000298/LER-1985-008, :on 850824,HPCI Sys Declared Inoperable During Startup.Caused by Error in Electrical Connections Between Governor Control & Valve Electrohydraulic Servo.Procedures Revised to Test HPCI Governor Control Sys ‎ (← links)
  • 05000298/LER-1985-005, :on 850818,discovered Two Type B & Nine Type C Penetration Failures During Primary Containment Local Leak Rate Testing,Resulting in Excessive Leak Rate.Cause Not Stated.Valves Replaced or Repaired ‎ (← links)
  • 05000298/LER-1985-013, :on 851022,automatic Closure Emergency Transformer Power Supply Challenged W/Plant in Shutdown. Caused by Inadvertent Opening of 125-volt Dc Feeder Breaker. Breaker Reclosed.Electrical Lineup Established ‎ (← links)
  • 05000298/LER-1985-011, :on 851020,HPCI Sys Declared Inoperable During Surveillance Testing.Caused by Damaged Disconnect Switch in Valve Motor Starter Due to Overtravel of Operating Handle. Switch Replaced.Redesign Under Evaluation ‎ (← links)
  • 05000298/LER-1985-012, :on 851020,HPCI Sys Inoperable During Daily Exercising of Turbine Auxiliary Lube Oil Pump.Caused by Burned Commutator Segments & Shorted Armature Coils on Oil Pump Motor.Motor Rebuilt ‎ (← links)
  • 05000298/LER-1985-020, :on 850810,surveillance Testing on Automatic Depressurization Sys Improperly Conducted.Caused by Personnel Error & Lack of Procedures Re Design Change 84-01. Procedures Revised & Personnel Counseled ‎ (← links)
  • 05000298/LER-1985-021, :on 850723,during Transfer of Fuel Assembly to Spent Fuel Storage Rack,Refueling Bridge Fuel Grapple Improperly Engaged.Caused by Lack of Procedure for Visual Confirmation of Engagement.Procedure Revised ‎ (← links)
  • 05000298/LER-1985-006, :on 850819,HPCI Sys Declared Inoperable Due to Motor Operator Failure on Sys Suction Valve.Caused by Misadjusted Torque Switch in Motor.Motor Replaced.Torque Switch Readjusted ‎ (← links)
  • 05000298/LER-1985-004, :on 850813,during Termination of Individual File,Determined That Overexposure to Individual Under 18 Yrs of Age Occurred in 1982.Caused by Individual Falsifying Birthdate on Radiation Form ‎ (← links)
  • 05000298/LER-1996-015, :on 961025,declared Reactor Valves Inoperable Due to Potential for Single Active Failure.Caused by Inadequate Plant Mod.Performed Assessments on Valves & Will Correct Design of Pneumatic Supplies ‎ (← links)
  • 05000298/LER-1997-001, :on 970130,six Containment Penetrations Susceptible to Thermally Induced Overpressurization.Caused by Failure to Recognize Potential Failure Modes in GL 96-06. Evaluated Six Affected Penetrations ‎ (← links)
  • 05000298/LER-1996-013-01, :on 960925,HPC Injection Sys Was Declared Inoperable Due to Control Oil Leak on Turbine Stop Valve Actuator.Procedure 7.2.63 Has Been Placed on Administrative Hold Pending Revision ‎ (← links)
  • 05000298/LER-1985-003, :on 850520, as-found Setpoints of Safety & Safety Relief Valves Discovered Outside Tech Spec Tolerance of +/-1% Valve Setpoint Pressure.Caused by Setpoint Drift. Safe Operation Unaffected ‎ (← links)
  • 05000298/LER-1996-014, :on 961001,fuel Preparation Machine Upper Limit Stops Set in Violation of Tss.Caused by Spent Fuel Bundles Raised.Machine Tagged Out to Prohibit Operation & Upper Limits Stops Reset ‎ (← links)
  • 05000298/LER-1996-008, :on 960323,half Scram Signal Occurred.Caused by Stuck Shut Instrument Lower Shutoff Valve.Opened CRD-V-93, Revised Procedures Re Kerotest Model 9915R Valve & Provided Training to Personnel Re Subject Valve ‎ (← links)
  • 05000298/LER-1996-013, :on 960925,HPCI Sys Declared Inoperable Due to Control Oil Leak on Turbine Stop Valve Actuator. Stripped Stud Replaced,Actuator Reassembled & Surveillance Satisfactorily Completed ‎ (← links)
  • 05000298/LER-1996-012, :on 960918,CR Emergency Filter Sys Inoperability Occurred Due to Inappropriate Actuation Setting.Crvm Setpoint Was Adjusted to Below TS Value Which Returned Monitor to Operable Status ‎ (← links)
  • 05000298/LER-1992-019-01, :on 921230,design Deficiency W/Ac Electrical Sys Confirmed When Single Nonaccident Event Could Result in Common Mode Failure of Both Dgs.Permanent Electrical Jumper Installed in Each Breaker Trip Circuit ‎ (← links)
  • 05000298/LER-1992-018, :on 921217,HPCI,RCIC & SLC Sys Declared Inoperable Due to Missed Insps of Pump Suction Piping.Caused by Lack of Scheduling Info for Class 3 Piping.Addl Enhancement Will Be Implemented for Program ‎ (← links)
  • 05000298/LER-1992-014, :on 920731,HPCI Sys Declared Inoperable Due to Severe Oil Leak from Diaphragm Area of Mechanical/Hydraulic Overspeed Trip Auto Reset Control Assembly.Valve Assembly Replaced & HPCI Sys Tested Satisfactorily & Returned to Svc ‎ (← links)
  • 05000298/LER-1992-013, :on 920730,error Discovered in Limiting Single Failure Assumption for ECCS Performance Analysis.Analysis in 1976 Contained Erroneous Evaluation of Eccs.Plant Mods Will Be Made to Restore Validity of Previous Assumptions ‎ (← links)
  • 05000298/LER-1992-017, :on 921209,HPCI-MOV-MO058 Automatically Opened,Resulting in Closure of Pump Suction Valve from Emergency Condensate Storage Tank.Caused by Procedural Deficiency.Valves Realigned & Event Reviewed ‎ (← links)
  • 05000298/LER-1996-005, :on 960509,partial Group 5 Containment Isolation Received Causing RCIC-MOV-MO15 to Close Due to Personnel Error.Procedures That Require Removal of Sensitive Relay Covers for Monitoring Will Be Revised ‎ (← links)
  • 05000298/LER-1996-010, :on 960724,previous Unavailability of Muffler Bypass Valve on EDG 2 Identified.Cause Could Not Be establised.DG-AOV-MB2 Replaced & Functionality Verified ‎ (← links)
  • 05000298/LER-1985-002, :on 850326,three Deficiencies Identified in Standby Gas Treatment Sys,Namely Expansion Sleeves at Fan Discharge & in Crossover Line,Supports for Crossover Duct & Housing Drains.Caused by Design Inadequacies ‎ (← links)
  • 05000298/LER-1992-016, :on 921001,identified Inadequate Isolation of DG 2 Differential Protection.Caused by Failure of Alternate Shutdown Design Review.Issued Change to Procedure for Operation of DG 2 from DG Room ‎ (← links)
  • 05000298/LER-1996-007, :on 960618,discovered Surveillance Coordinator self-identified RCIC IST Vibration Readings Missed.Caused by Personnel Error.Rcic Pump Replaced ‎ (← links)
  • 05000298/LER-1992-015, :on 920911,RV Level Fell Below Low Level Setpoint Initiating Group 2,3 & 6 Isolations.Caused by Procedures Governing Normal Shutdown of Plant.Procedure Changes & Training Will Be Provided ‎ (← links)
  • 05000298/LER-1996-006, :on 960606,established That 10CFR50 App R Vulnerabilities Existed Due to Errors Incurred During Plant Design Changes.Discrepant Configurations Modified & safe- Shutdown Analysis re-performed for Fire Areas ‎ (← links)
  • 05000298/LER-1992-009, :on 920611,noncompliance w/10CFR50 App R, Failure of Post Fire Safe Shutdown Equipment Discovered. Caused by Inadequate Alternate Shutdown (ASD) Design Criteria.Asd Procedures Revised ‎ (← links)
  • 05000298/LER-1996-011, :on 960827,declared High Pressure Coolant Injection Sys Inoperable.Caused by Loose Nut on Stop Valve Split Coupling.Torqued Loose Nut & Will Review and Revise Procedures Re Valve Maint ‎ (← links)
  • 05000298/LER-1995-018, :on 951121,recognized Design Bases of Steam Tunnel Blowout Panels Not Well Documented.Cause Cannot Be Established.Bulk of Fiberglass Removed from Blowout Panels ‎ (← links)
  • 05000298/LER-1996-001, :on 960118,potential Inoperability of Emergency Diesel Generators Determined.Caused by Failure of Mgt to Effectively Communicate Installation of Modifications.Tubing & Fittings Removed from SPV Exhaust Ports ‎ (← links)
  • 05000298/LER-1996-004, :on 960409,failed to Perform Surveillance within Required Surveillance Interval.Caused by Mgt/Qa Deficiency.Reviewed Past Surveillances for Similar Occurrences ‎ (← links)
  • 05000298/LER-1995-020, :on 951125,found That Drawing Change Process Deficiency Resulted in Noncompliance w/1CFR50 App R.Design Change Process Being Revised & Training Will Be Presented to Appropriate Design Personnel on Process Revs ‎ (← links)
  • 05000298/LER-1984-011, :on 840828,HPCI Overspeed Trip Control Valve Diaphragm Failed.Caused by Problem W/Procurement of Valve Diaphragms for Subj Control Valve Application. Preventative Maint Instituted ‎ (← links)
  • 05000298/LER-1996-002, :on 960322,unassured Past Operability of Core Spray Subsystem a Due to Susceptibility of Injection Valve to Pressure Locking.Caused by Original Design Error.Gate Valve Reactor Side of Disc Modified ‎ (← links)
  • 05000298/LER-1985-001, :on 840922,during Secondary Containment Leak Test,Fuel Handling Operations Conducted W/O Verification of Secondary Containment Integrity.Caused by Combination of Procedural & Personnel Errors ‎ (← links)
  • 05000298/LER-1992-010, :on 920621,during Performance of Surveillance Procedure CR HVAC Emergency Bypass Inlet Valve Failed to Actuate Correctly.Caused by Failure of Pneumatic Relay in Control Circuit.Temporary Mod Installed ‎ (← links)
  • 05000298/LER-1992-008-01, :on 920611,HPCI Sys Discovered Inoperable Due to Stem Nut Wear of Mov.Worn Stem Nut Replaced.Independent Failure Evaluation of Stripped Stem Nut Being Performed.W/ ‎ (← links)
  • 05000298/LER-1992-008, :on 920611,HPCI Sys Determined Inoperable When Pump Suction Valve from Torus Would Not Stroke Properly. Caused by Worn Bronze Stem Nut Internal Diameter Threads. Nut Replaced,Operator Reinstalled & Settings Adjusted ‎ (← links)
  • 05000298/LER-1995-023, :on 951030,loss of Configuration Control by Valve Vendor Occurred.Caused by MOV Program Ownership & Weaknesses in Programmatic Controls.Vendors for MOVs Included in GL 89-10 Program Audited ‎ (← links)
  • 05000298/LER-1995-019, :on 951124,CR Emergency Filter Sys (CREFS) Was Inoperable Due to EDG Being Unavailable.Restored CREFS to Operability ‎ (← links)
  • 05000298/LER-1992-012, :on 920715,RCIC Sys Declared Inoperable Due to Intrusion Into Motor Operator.Caused by Packing Leak & Defective Conduit Shield.Mov Motor Replaced.Conduit Will Be Replaced During 1993 Refuleing Outage ‎ (← links)
  • 05000298/LER-1992-011, :on 920625,two Installations of Thermo-Lag 330 Fire Barrier Matl,Used to Provide 1 H Protection,Identified Per Review of NRC Bulletin 92-001.Caused by Inadequate Qualification Testing.Restoration Underway ‎ (← links)
  • 05000298/LER-1995-022, :on 951213,reactor Trip Signal,Esf Occurred. Caused by Personnel Error.Training to Maint Planners Provided to Enhance Ability to Identify & Develop Post Maint Testing Requirements ‎ (← links)
  • 05000298/LER-1984-010, :on 840808,main Steam Line Break Detection Sys Sensed High Temp in Steam Tunnel & Generated Group I Isolation Signal,Causing MSIVs to Shut.Caused by Inadequate Main Steam Line Insulation ‎ (← links)
  • 05000298/LER-1992-007, :on 920420,Shutdown Cooling Isolation Valves Automatically Closed.Caused by Void Formation & Collapse in RHR Lines.Pressure in Vessel Was Increased & Isolation Valve Opened ‎ (← links)
  • 05000298/LER-1995-021, :on 951209,RHR Pump a Tripped During SDC Mode, Due to Spurious Actuation of Either SDC Suction High Pressure Switch or Momentary Loss of 16A-K28 or 16A-K50 Logic Relay.Sdc Returned to Svc ‎ (← links)
  • 05000298/LER-1992-006, :on 920407,250-volt Battery Charger 1B Input Breaker Tripped.On 920408,250-volt Battery Charger 1A Tripped.Charger 1A Trip Due to Inadequate Preventive Maint. Relay K-3 Replaced & Calibr ‎ (← links)
  • 05000298/LER-1995-017, :on 951023,safety/relief & Safety Valves Found Outside TS Limiting Safety Sys Setting.Caused by Corrosion Bonding of Pilot Disc to Pilot Seat.Safety Relief Valve Surveillance Procedure Revised ‎ (← links)
  • 05000298/LER-1992-005, :on 920325,RCIC Sys Declared Inoperable Due to Evidence of Water in Turbine Casing.Caused by Malfunctioning Turbine Exhaust Line Steam Trap.Steam Trap Removed & Cleaned & Internals Installed ‎ (← links)
  • 05000298/LER-1984-009, :on 840719,operation of APRM Flow Biased Scram & Rod Block Sys Inconsistent W/Tech Specs.Caused by Configuration Changes Not Fully Incorporated in Tech Specs. Tech Specs Revised ‎ (← links)
  • 05000298/LER-1995-016, :on 951027,during Core off-load,MCR Supply Fans Shut Down.Single Train CREFS Inoperable.Caused by Personnel Error.Cr Ventilation Restored 9 Minutes Later.Licensed Operator Responsible Counseled ‎ (← links)
  • 05000298/LER-1995-015, :on 951026,F Bus Was Transferred to Emergency Transformer Due to Error Committed by Engineer in Providing Test Instructions in Mwr 95-2599.Counseled Engineer That Prepared Mwr 95-2599 ‎ (← links)
  • 05000298/LER-1995-012, :on 951014,RPS Trip Signal & Primary Containment Group Isolations Occurred During Shutdown for Refueling Outage.Evaluated & Revised Procedures.W/Forwarding Ltr ‎ (← links)
  • 05000298/LER-1991-021, :on 911214,automatic Start of 1 DG & Actuation of Group 2,3,6 & 7 Isolation Occurred.Caused by Inadvertent Failure of Licensed Operator to Perform Specified Action. Personnel Invloved Will Be Counselled ‎ (← links)
  • 05000298/LER-1991-022, :on 911221,partial Group 3 Isolation Received, Causing One of Two Inlet Isolation Valves to Close.Caused by Actuation of Differential Pressure Flow Switch.Switch Guard Has Been Installed Around Switch ‎ (← links)
  • 05000298/LER-1992-001, :on 920111,both Pumps Exceeded Setpoints of High Flow Isolation Switch.Caused by Insufficient Throttling of Valve.Group 3 Isolation Was Reset & B Pump Placed Into Operation ‎ (← links)
  • 05000298/LER-1995-010, :on 950413,unanalyzed Condition Discovered During Closeout of RHR Min Flow Valve Design Change (DC) 94-332.Caused by Improper Review of Previous DC 76-2.Util Implemented DC 94-332 ‎ (← links)
  • 05000298/LER-1991-016, :on 911110,spurious RPS Trip Occurred While Shut Down Due to Decontamination Activities.Caused by Programmatic Deficiency in That Precautions Were Not Taken. Pertinent Procedures Will Be Upgraded ‎ (← links)
  • 05000298/LER-1984-007, :on 840419,bulldozer Inadvertently Sheared Hydrant from Fire Protection Sys within Restricted Security Area.Caused by Lack of Attention by Bulldozer Operator. Repairs in Progress ‎ (← links)
  • 05000298/LER-1992-004, :on 920210,Group 3 Isolation Occurred on High Reactor Water Cleanup Temp.Caused by Failure to Maintain Interim Corrective Actions.Operating Procedures Revised & Isolation Was Reset ‎ (← links)
  • 05000298/LER-1984-008, :on 840609,discharge of Liquid Radioactive Effluent Occurred W/Discharge Monitor Outlet Valve Shut. Caused by Personnel Error.Procedures Revised to Prevent Recurrence ‎ (← links)
  • 05000298/LER-1992-002, :on 920203 & 4,reactor Vessel Water Setpoint Inaccuracy Resulted from Reference Leg Temp Effects That Had Not Been Correctly Addressed.Setpoint Calculations Were Performed ‎ (← links)
  • 05000298/LER-1991-019, :on 911209,shutdown Cooling High Suction Pressure Interlock Actuated Due to Momentary Pressure Transient Caused by Starting RHR Pump.Procedure Change Will Be Processed ‎ (← links)
  • 05000298/LER-1991-020, :on 911210,drywell Vent Radiation Monitor Gaseous Detector Mounting Bolt Threaded Engagement Failed & Leak Rate Exceeded TS Requirements.Caused by Degraded Shield Chamber.Bolt Holes Retapped ‎ (← links)
  • 05000298/LER-1991-018, :on 910323,4160 Volt Circuit Breaker 1CN Failed to Open Upon Actuation of Breaker Control Switch Roller Mechanism.Caused by Hardened Lubricant.Trip Latch & Cam Rollers of All 4160 Volt Breakers Removed ‎ (← links)
  • 05000298/LER-1991-017, :on 911123,fuse 16A-F21 Blew Upon Removal of Circuit Lead Resulting in Actuation of RCS Primary & Secondary Contaiment Isolation Valves.Cause Unknown.Fused Replaced,Circuit Reenergized & Tested ‎ (← links)
  • 05000298/LER-1991-015, :on 911105,discovered That as-found Setpoint for Safety/Relief Valves Not within Tech Spec Limit of Plus or Minus 1% (11 Psi).Caused by Setpoint Drift.Valves Inspected,Refurbished & Retested ‎ (← links)
  • 05000298/LER-1991-014, :on 911030,unplanned Actuation of Group 6 Isolation Occurred.Caused by Improper Selection of Uninsulated Metal Clip for Surveillance Testing.Uninsulated Metal Clips Replaced During Refueling Outage ‎ (← links)
  • 05000298/LER-1991-013, :on 911018,continuous Fire Watch Not Established for Obstructed Fire Door to Steam Tunnel.Caused by Personnel Error & Procedural Deficiency.Roving Fire Watch Initiated & Procedures Upgraded ‎ (← links)
  • 05000298/LER-1991-012, :on 911015,unplanned ESF Actuations Occurred During Design Change Activities Resulting from Personnel Error,Human Factors & Inadequate Precautions for Work in Sensitive Areas.Written Guidelines Developed ‎ (← links)
  • 05000298/LER-1991-011, :on 911007,RPS Trip & Actuation of Groups 2 & 3 Isolations Occurred.Caused by Either Air Through Leg Injection Solenoid Valve or Water Leakage Through Solenoid Valve.Backflushing Will Be Conducted ‎ (← links)
  • 05000298/LER-1995-013, :on 950523,determined That Plant Procedural Requirements Inconsistent W/Assumptions & Commitments Made to NRC on 910930.Caused by Programmatic Deficiency.Rev to Procedure 5.2.5.1 Made ‎ (← links)
  • 05000298/LER-1983-014-03, /03L-0:on 830915,during Surveillance Testing, Pressurization of Suppression Chamber Air Space Noted During HPCI Turbine Operation.Caused by Error in Vacuum Breaker Design/Installation.Breaker Replaced ‎ (← links)
  • 05000298/LER-1995-011, :on 950509,three Fire Detectors in DG Rooms Did Not Give Trouble Alarm When Removed from Bases.Caused by Neglected Removal of Mfg Jumpers.Jumpers Removed & Zone Retested Satisfactorily ‎ (← links)
  • 05000298/LER-1991-009, :on 910904 & 09,two Unplanned Group 6 Isolations Occurred Due to Spurious Loss of Power.Caused by Faulty Voltage Regulator Card.Defective Card Replaced.W/ ‎ (← links)
  • 05000298/LER-1984-006, :on 840418,offgas Stack Release Not Monitored as Required by Tech Specs.Caused by Technician Failure to Follow Approved Procedure.Plant Procedures Revised ‎ (← links)
  • 05000298/LER-1984-005, :on 840409,leakage of Primary Coolant Water Found in Reactor Recirculation Pump B Discharge Isolation Valve Drain Line.Caused by Circumferential Cracking in Weld Joint.Weld Metal & Pipe Replaced ‎ (← links)
  • 05000298/LER-1984-004, :on 840405,operator Observed Increase in Turbine Speed & Pump Discharge Pressure W/Zero Output.Caused by Defective Ramp Generator & Signal Converter Box.Generator Replaced.Sys Tested Satisfactorily ‎ (← links)
  • 05000298/LER-1978-039-03, /03L-0 on 781206:while Performing Surveillance Test After No 1 Diesel Generator Was Out of Svc for Maint,Diesel Engine Failed to Reach Full Speed.Caused by Reduced Air Pressure ‎ (← links)
  • 05000298/LER-1978-038-03, /03L-0 on 781208:during Normal Operation,One Struthers Wells Cross Connect Valve Failed to Open During Surveillance Procedure.Caused by Mfg Error ‎ (← links)
  • 05000298/LER-1991-008, :on 910826,valve RHR-MO-M057 Exceeded TS Closure Time During Surveillance Testing.On 910917,valve Not Deactivated During Period of Inoperability.Caused by Personnel Failure.Personnel Counseled ‎ (← links)
  • 05000298/LER-1995-009, :on 950401,fire Suppression Water Sys Did Not Meet Minimum Requirements for Operability Due to Pinhole Leak Developing in Section of Piping.Pinhole Leak Was Temporarily Repaired ‎ (← links)
  • 05000298/LER-1995-008, :on 950314,particulate Filter in Erp Normal Range Kaman Was Discovered Missing Due to Defective Procedure.Examined Remaining Monitors & Backup Samplers to Verify Proper Installation of Filters ‎ (← links)
  • 05000298/LER-1991-007, :on 910730,fan Coil Units Declared Inoperable. Caused by Inadequacies in Original Design.All Safety Related Fan Coil Units Verified to Be Correctly Supported ‎ (← links)
  • 05000298/LER-1995-007, :on 950224,iodine Channel of CR Air Sampling Monitor RMV-RM-1 Failed to Meet Calibr Tolerance Required by Sp 6.4.6.3.1 Due to Inadequate Procedure.Sps 6.4.6.3.1 & 6.2.3.3.1 Will Be Revised by 950430 ‎ (← links)
  • 05000298/LER-1995-006, :on 950209,SRMs Documented as Not Having Been Calibrated in Accordance W/Stated Requirements of Tss.Caused by Personnel Error.Srm Quarterly Calibration Surveillance Procedure Revised & SRM Recalibrated ‎ (← links)
  • 05000298/LER-1983-015-03, /03L-0:on 830923,pressure Switch NBI-PS-102A Failed to Perform High Pressure Safety Trip of Reactor Recirculation Pump A.Caused by Relay Failure to Energize. Relay Replaced ‎ (← links)
  • 05000298/LER-1995-005, :on 950210,safety Relief Valves Failed to Operate from Control Room.Caused by Rust/Corrosion in Solenoid Valve Assembly Resulting in Binding of Plunger to Bonnet Tube.Failed Solenoid Valves Replaced ‎ (← links)
  • 05000298/LER-1984-002, :on 840129,piece of Reactor Bldg Aluminum Siding Detached & Blew Onto 161 Kv Line,Creating Electrical Short to Startup Transformer & Causing Eventual Reactor Scram.Caused by High Winds ‎ (← links)
  • 05000298/LER-1984-001, :on 840120,reactor Vessel Water Level Indicating Switch NBI-LIS-101B Failed to Reset When Simulated High Level Signal Removed.Caused by Component end- of-life.Microswitch Replaced ‎ (← links)
  • 05000298/LER-1984-003, :on 840130,high Average Power Range Monitor High Flux Reactor Trip Occurred,Causing Reactor Feedwater Pump Trip.Caused by Personnel Errors.Plant Stabilized & Personnel Counseled ‎ (← links)
  • 05000298/LER-1995-004, :on 950201,primary Containment Group Isolations Occurred.Caused by Surveillance Procedure Deficiencies.Sp 6.3.10.2 Was Terminated & Correct Valve Lineup Was Determined ‎ (← links)
  • 05000298/LER-1995-003, :on 950128,annual Cycling Surveillance of Fire Protection Valves Was Missed.Caused by Defective Procedure. Temporary Procedure Change Was Initiated to Sp 6.4.5.2.9 ‎ (← links)
  • 05000298/LER-1983-013-03, /03L-0:on 830831,during Local Leak Rate Test, Procedure 6.3.1.1,20,penetrations Found Leaking Excessively. Caused by Discs & Seats Being Lapped.Valves Repaired ‎ (← links)
  • 05000298/LER-1995-001, :on 950107,tested Surveillance of Detection Sys Supervisory Circuits.Caused by Defective Procedure.Fire Watch Posted in DG Fire Areas & Maintained Until Detection Sys Was Declared Operable ‎ (← links)
  • 05000298/LER-1994-031, :on 941115,discovered That Steam Leak Detection Sys Temp Switches Not Being Calibrated within Surveillance Interval Intended by Tss.Caused by Personnel Error. Calibration Schedule of Switches Updated ‎ (← links)
  • 05000298/LER-1994-028, :on 941101,design Error That Places Ultimate Heat Sink in Unanalyzed Condition During Design Low River Level Conditions Due to Mod Made at End of Plant Const That Created Intake Structure Weir Wall ‎ (← links)
  • 05000298/LER-1993-027-01, :on 930618,potential Degradation of Secondary Containment Was Undetected Due to Preconditioning & Test Methodology Deficiencies.Review of Test Procedures Underway ‎ (← links)
  • 05000298/LER-1982-026-03, /03L-0:on 821222,diesel Generators (Alternate Source of Emergency Power) Not Tested to Demonstrate Operability When 69-kV Line Taken Out of Svc for Repairs. Cause Not Stated.Operators Informed of Testing Procedures ‎ (← links)
  • 05000298/LER-1991-010, :on 911002,group 3 Isolation (RWCU Sys) Occurred Due to High Temp Conditions Downstream of Nonregenerative Hxs.Caused by Hot Water Drawn Into Section of Piping.Procedure Change to Be Processed ‎ (← links)
  • 05000298/LER-1991-005, :on 910511,unplanned Startup of Diesel Generator Number 2 Occurred Due to Equipment Deficiency During Plant Startup.Caused by Insufficent Action of Breaker.Breaker Shimmed & Reinstalled ‎ (← links)
  • 05000298/LER-1991-002, :on 910324,reactor Water Cleanup Isolation Occurred Due to High Sys Temp.Caused by Inadequate Design. Design Process for Plant Changes Strengthened Since Design Completed ‎ (← links)
  • 05000298/LER-1994-027, :on 941116,non-environmentally Qualified Relay, MS-REL-52XCP Discovered.Caused by Inadequate Procedure to Ensure Proper Identification & Classification of Component. Unqualified Relay MS-REL-52XCP Replaced ‎ (← links)
  • 05000298/LER-1994-036, :on 941207,an Electrical Transient on 12.5 Kv Sys Resulted in Loss of Power to Plant Primary electric- Driven Fire Pump & Water Jockey Pump.Caused by Electrical Fault.Alternate Power Source Restored Sys ‎ (← links)
  • 05000298/LER-1994-034, :on 941112,investigation of Emergency Lighting Revealed Potential Problems W/Lamps Due to Maint Program Not Addressing Rated Life Time.Caused by Mgt/Qa Deficiency. Replacement of Batteries,Lamps Required ‎ (← links)
  • 05000298/LER-1994-030, :on 941010,ceiling Plugs in SW Pump Room Reinstalled & Visual Insp Performed by Person Not QC Certified.Caused by Personnel Error.Maintenance Manager Issued Instructions Re QC Certifications ‎ (← links)
  • 05000298/LER-1995-002, :on 950110,14 PCIVs Documented as Not Having Been Modified to Prevent Potential auto-opening Upon Manual Reset.Caused by Personnel Error.Control Circuitry of 14 PCIVs Modified to Prevent auto-opening ‎ (← links)
  • 05000298/LER-1994-016, :on 940804,determined That DG 2 Not in Compliance W/Alternate Shutdown Requirements.Caused by Narrow Interpretation of Isolation Requirements for Dg. Design Change Implemented ‎ (← links)
  • 05000298/LER-1994-015, :on 940910,during RPV Stratification Events Heatup/Cooldown Was Exceeded.Caused by TS LCO 3.6.A.1 Requirement Applied to Average Coolant Temp.Submitted Proposed TS Change That Clarified LCO 3.6.A.1 ‎ (← links)
  • 05000298/LER-1994-026, :on 941009,determined That Temp of Solution in Standby Liquid Control Sys Not Being Monitored,Per Ts.Caused by Mgt/Qa Deficiency.Design Change Will Be Implemented to Upgrade SLC Heat to Comply W/Requirements ‎ (← links)
  • 05000298/LER-1994-025, :on 940930,improper Installation & Calibr of Kaman Normal & High Range Gaseous Activity Detectors Noted. Caused by Personnel Error.Detectors Reinstalled & Recalibrated ‎ (← links)
  • 05000298/LER-1994-021, :on 941007,design Flaw Discovered That Could Cause DGs Rendered Inoperable During Fire in Turbine Bldg. Caused by Improperly Executed Minor Design Change.Hp Carbon Dioxide Extinguishing Sys Input Disabled ‎ (← links)
  • 05000298/LER-1994-035, :on 941229,determined That SBGTS Operability Could Not Be Assured Due to Potential Backflow of Water from Z Sump Under Design Basis Accident Conditions.Caused by Design Error.Applicable Procedures Reviewed ‎ (← links)
  • 05000298/LER-1994-023, :on 941003,TS Violation Identified for Failure to Perform re-demonstration of DG-1 Operability.Caused by Inadequate Training.Training (Tailgate Sessions) W/Licensed Operations Personnel Will Be Performed ‎ (← links)
  • 05000298/LER-1994-033, :on 941220,eight SRVs Removed & Sent to W Testing Facilities Because Four of SRV Lift Pressures Higher than Required Setpoint Tolerance.Caused by Design & Mfg.Ge Confirmed set-points Pose No Adverse Affects ‎ (← links)
  • 05000298/LER-1994-022, :on 940919,TS Maximum Flow Limitation for LPCI Sys Were Not Proven by Existing Sp 6.3.5.1.Caused by non-compliance W/Ts Surveillance Requirements.Design Change Acceptance Testing Performed ‎ (← links)
  • 05000298/LER-1994-012, :on 940708,TS Noncompliance for HPCI Sys Noted Re Setpoint Discrepancy Associated W/Low Steam Line Isolation Pressure Switches.Requested TS Change to NRC Establishing Operability Limit for HPCI ‎ (← links)
  • 05000298/LER-1994-019, :on 940411,determined That Feedwater Flow Transmitters Had Been Improperly Calibrated Since Installation in 1980.Caused by Personnel Error.Power Reduced by 20 MW (Th) & Recalibrated ‎ (← links)
  • 05000298/LER-1991-006, :on 910709,safety Setting for 4,160-volt Loss of Voltage Relays Incorrectly Reflected Original Design Basis Requirements.Caused by Misstatement in Tech Specs. Emergency TS Change Submitted on 910717 ‎ (← links)
  • 05000298/LER-1983-011-01, /01T-0:on 830710,welds CSA-BJ-5 & 6 Found Leaking During Grinding of Weld Crowns.Caused by Intergranular Stress Corrosion Cracking.Welds to Be Repaired by Weld Overlay Methods.Piping Will Be Replaced ‎ (← links)
  • 05000298/LER-1983-012-03, /03L-0:on 830621,during Control Rod Shuffle,Fuel Bundle Removed & Reloaded Into Core in Same Position W/O All Control Rods Inserted.Caused by Personnel Error.Crews Briefed ‎ (← links)
  • 05000298/LER-1983-010-03, /03L-0:on 830617,during Functional Surveillance Testing by Wyle Lab,One Main Steam Snubber Failed to Meet Bleed Rate Criteria & One Svc Water Snubber Failed to Meet Lockup Rate.Caused by Plugging by Foreign Matl ‎ (← links)
  • 05000298/LER-1994-010-01, :on 940526,closure of Shutdown Cooling Suction Isolation Valves While Warming RHR Sys Due to Leakage Through Minimum Flow Valve.Sr MOV Will Be Checked for torque-in Current During MOV Surveillance ‎ (← links)
  • 05000298/LER-1994-024, :on 941002,inoperable Condition of Halon Sys in Svc Water Pump Room Identified.Caused by Inadequate Procedures.Procedure 0.39, Fire Watch Will Be Revised.W/ ‎ (← links)
  • 05000298/LER-1983-006-03, /03L-0:on 830509,during Performance of Surveillance Procedure 6.3.10.9.1,four RHR Mechanical Snubbers Frozen.Caused by RHR Shutdown Cooling Creating Water Hammer & Overloading snubbers.w/830608 Ltr ‎ (← links)
  • 05000298/LER-1983-004-03, /03L-0:on 830409,during Sp 6.1.4,contacts of Relay 917-5A-K7D Failed to Open.Cause Not Determined.Relay Coil Replaced & Proper Operation Verified.All Ac Hfa Relays on Essential Sys Will Be Tested During Spring 1983 Outage ‎ (← links)
  • 05000298/LER-1983-003-03, /03L-0:on 830403,indication & Control Power for Reactor Bldg Exhaust Valve HN-260MV Failed,Resulting in Valve Not Automatically Closing on Isolation Signal.Caused by Burned Out Lamp.Lamp & Fuse Replaced ‎ (← links)
  • 05000298/LER-1991-004, :on 910326,unplanned Automatic Startup of Diesel Generator 1 Occurred.Caused by Inadequate Planning & Poor Communications.Shutdown Cooling Restored & Sys Realigned Prior to Configuration ‎ (← links)
  • 05000298/LER-1991-003, :on 910325,unplanned Actuation of Group IV Isolation Occurred During Testing.Caused by Personnel Error & Procedure Deficiency.Procedure Change Being Processed Providing Improved Direction for Action ‎ (← links)
  • 05000298/LER-1994-017, :on 940809,engineering Evaluation May Not Have Been Responsive to Intent or Potential Ramifications of Condition Addressed by In.Caused by Failure of REC Ci Valve.Evaluation of re-assessment Is ongoing.W/940908 ‎ (← links)
  • 05000298/LER-1983-009-01, /01T-0:on 830629,pinhole Leaks Found in heat- Affected Zone of Weld CWA-BJ-2 During Insulation Removal on 6-inch Reactor Water Cleanup Suction Line.Caused by Intergranular Stress Corrosion Cracking ‎ (← links)
  • 05000298/LER-1994-014, :on 940723,CR Emergency Filter Sys Failed to Meet Acceptance Criteria Specified in Sp 6.3.17.18 Due to Imbalance in Sys Created by Movement of Damper HV-AD-AD1021C.Damper Modified ‎ (← links)
  • 05000298/LER-1983-007-03, /03L-0:on 830518,during Refueling,Both Standby Gas Treatment Sys Diesel Generators Found Inoperable.Caused by Personnel Failure to Follow Tech Spec Requirements. Requirements Reviewed & Clarified ‎ (← links)
  • 05000298/LER-1994-013, :on 940712,reactor Scram & Group Isolations Occurred Due to Spurious Trip of Reactor Vessel Level Instruments.Caused by Leaking Solenoid Valve in Ref Leg Injection Sys.Valve Replaced ‎ (← links)
  • 05000298/LER-1983-005-03, /03L-0:on 830505,scram Discharge Vol Drain Value CRD-CV-AOV33 Failed to Close Per Tech Specs.Caused by Grafoil Packing Working Between Valve Stem & Body.Valve Repacked ‎ (← links)
  • 05000298/LER-1994-005, :on 940317,shutdown Cooling Supply Isolation Valves Automically Closed.Cause Was Steam Void Formation & Collapse in RHR System Piping.Corrective Action:Shutdown Cooling Was Restored ‎ (← links)
  • 05000298/LER-1982-023-03, /03L-0:on 821128,while Snubber CS-57 Taken Out of Svc to Repair Oil Leak,Snubber Found Inverted.Caused by Loose Extension Tube Locknut Allowing Snubber to Rotate. Snubber Replaced ‎ (← links)
  • 05000298/LER-1994-010, :on 940526,closure of Shutdown Cooling Suction Isolation Valves Occurred.Cause Under Investigation.Suppl Will Specify Corrective Actions to Be Taken to Preclude Recurrence ‎ (← links)
  • 05000298/LER-1983-001-03, /03L-0:on 830223,while Performing Surveillance Procedure 6.2.2.2.4,safety Relief Valve 71-C Failed to Transfer Alternate Power Source When Fuse Pulled.Caused by Bad Contact on Relay.Relay Control Wipe Adjusted ‎ (← links)
  • 05000298/LER-1983-002-03, /03L-0:on 830218,source Range Monitor Rod Blocks Not Tested Prior to Hot Startup.Caused by Inadequate Procedures.Procedure 2.1.2 Revised ‎ (← links)
  • 05000298/LER-1991-001, :on 910107,unplanned Actuation of Group IV Isolation Logic Occurred.Caused by Incorrect Placement of Jumper.Event Incorporated in Industry Events Training for I&C Technicians ‎ (← links)
  • 05000298/LER-1982-020-03, /03L-0:on 821004,diesel Generator 2 Shutdown W/No Alarms or Indications.Water Found in Lube Oil Sys.Caused by Rupture of Left Cylinder Liner Expansion Seal on Diesel Engine.Seal Replaced & Part Returned to Vendor ‎ (← links)
  • 05000298/LER-1990-012, :on 900829,valve Stem Clamp Setscrew & Trim Failures Occurred Due to Vendor Design Deficiencies ‎ (← links)
  • 05000298/LER-1994-004, :on 940302,reactor Scram Occurred as Result of APRM High Neutron Flux Trip.Caused by Turbine Electro Hydraulic DEH Control Sys Malfunction.Valve Transfer Control Card Replaced ‎ (← links)
  • 05000298/LER-1994-003-01, :on 940215,radwaste Bldg High Range Gaseous Effluent Radiation Monitor Declared Inoperable Due to Missing O-ring in Lower Portion of Sample Assembly.Missing O-ring Replaced & Leak Test Conducted ‎ (← links)
  • 05000298/LER-1994-003, :on 940215,TS Violations Occurred Due to Inoperable Radiation Monitors.Caused by Improperly Assembled Particulate/Iodine Filter Assemblies.Missing O-rings Replaced & Leak Test Conducted ‎ (← links)
  • 05000298/LER-1993-026, :on 930618,determined That Safety Related Portions of SW & Reactor Equipment Cooling Sys Piping Not Included in ASME Code Section XI ISI Program.Portions Will Be Included by Next Refueling Outage ‎ (← links)
  • 05000298/LER-1994-001, :on 940119,HPCI Pump Min Flow Bypass Valve Unexpectedly Opened During Surviellance Testing While Pump Discharge Valve Being Opened Due to Actuation of Pump Discharge Pressure Switch.Valve Closed ‎ (← links)
  • 05000298/LER-1982-018-03, /03L-0:on 820727,torus Water Temp Rose to 102 F, Exceeding Tech Spec Limit.Caused by Greater Bulk Temps During HPCI Test.More Sophisticated Torus Temp Monitoring Sys Will Be Installed by Jul 1983 ‎ (← links)
  • 05000298/LER-1993-025, :on 930618,hydrogen/oxygen Monitoring Sys Operability Concerns Discovered Due to Moisture & Accumulation & Sample Pump Reliability.Design Change Implemented During 1993 Refueling Outage ‎ (← links)
  • 05000298/LER-1982-014-03, /03L-0:on 820607,rejectable Indications Found in Heat Affected Zones of Welds BJ-20,BJ-23,BJ-13 & BJ-15. Caused by Improper Fabrication Techniques During Original Const.Affected Piping & Fittings Replaced ‎ (← links)
  • 05000298/LER-1993-038, :on 931214,unplanned Automatic Reactor Scram & ESF Actuations Occurred Due to Feedwater Controller Failure. Caused by Age Degradation.Master Controller Replaced ‎ (← links)
  • 05000298/LER-1993-039, :on 931214,discovered Two Instrument Line Orifices Not Installed Due to Original Contruction Deficiencies.Caused by Mod Error.Orifices Installed & Tested ‎ (← links)
  • 05000298/LER-1982-019-03, /03L-0:on 820726,drywell Equipment Sump 1G High Level Alarm W/Subsequent Automatic Pump Operation Observed. Caused by Blown Fuse in Power Supply 20-545A for Flow Recorder & Flow Integrator.Fuse Replaced ‎ (← links)
  • 05000298/LER-1982-017-03, /03L-0:on 820713,at Completion of Overspeed Test on Diesel Generator 2,diesel Tripped Before Loading.Caused by Low Lube Oil Pressure Switch.Switch Replaced ‎ (← links)
  • 05000298/LER-1982-016-03, /03L-0:on 820712,diesel Generator Tripped W/No Alarms or Indications.Redundant Sys Operable.Caused by Drift in Holding Mechanism of Safety Trip Valve Overspeed Device. Valve & Section of Control Air Line Replaced ‎ (← links)
  • 05000298/LER-1980-051-03, /03L-0:on 801216,during Routine Surveillance Testing,Hpci Turbine Stop Valve Would Not Open & Sys Was Declared Inoperable.Caused by Excess Teflon Seal Matl Which Interfered W/Relay Valve on Hydraulic Actuator ‎ (← links)
  • 05000298/LER-1993-037, :on 931118,fire Door Declared Inoperable. Caused by Programmatic Deficiency.C/A:Procedures & Programs Will Be Revised to Ensure Clear Identification of Functions Each Door Performs ‎ (← links)
  • 05000298/LER-1982-015-03, /03L-0:on 820706,eleven Penetrations Leaked Excessively During Leak Rate Test.Cause Not Stated.Valve Repairs Performed on Anchor Gates,Globes & Checks.Anchor 6 Gate Valve Replaced.Final Leakage within Limit ‎ (← links)
  • 05000298/LER-1990-011, :on 901017,unplanned Automatic Reactor Scram & ESF Actuations Occurred Due to 345 Kv Ground Fault ‎ (← links)
  • 05000298/LER-1993-033, :on 931011,primary Containment Declared Inoperable & Plant Placed in Lco,Per TS 3.7.A.2,loss of Containment Integrity.Caused by Design Deficiency.Design Mods & Licensing Basis Revs Evaluated ‎ (← links)
  • 05000298/LER-1990-009, :on 900808,RCIC Inoperable Due to Failure of motor-operated Steam Supply Valve.Caused by Hydraulic Lock Condition in Spring Pack.Motor Replaced & Spring Pack Cleaned ‎ (← links)
  • 05000298/LER-1993-032, :on 930708,B 125 Volt Battery Disconnect Switch Fuse Failed.Caused by Defective Fuse.Defective Fuses Replaced & Battery Returned to Svc ‎ (← links)
  • 05000298/LER-1993-034, :on 931028,identified That Fire Brigade Members from Support Groups Had Not Received Quarterly Fire Brigade Training Due to Misunderstanding.Quarterly Fire Brigade Training Provided to Appropriate Personnel ‎ (← links)
  • 05000298/LER-1993-030, :on 930708,discovered Inadequate Inservice Testing of Svc Water Sys Check Valves Due to Flow Instrument Calibr Error & Personnel Error in Specifying Sys Flow Requirement.Revised Calibr Factor Developed ‎ (← links)
  • 05000298/LER-1993-029, :on 930708,partially Withdrawn Control Rod 26-31 Scrammed.Caused by RPS Scram Signal from Two of Four Reactor Pressure Scram Switches.Scram Reset & Pressure Testing Completed ‎ (← links)
  • 05000298/LER-1993-008, :on 930328,4,160-volt Breakers 1BG,1GB & 1GE Tripped Due to Actuation of 1GS Breaker Lockout Relay.Caused by Oversight in Design Change Installation Instructions. Work Stopped & Design Change Implemented ‎ (← links)
  • 05000298/LER-1993-007, :on 930326,determined That ECCS Pump Compartment Cooler Power Supply Design Defect Could Have Prevented Adequate Containment Heat Removal.Caused by Design Errors.Mods Planned to Provide Convection Cooling ‎ (← links)
  • 05000298/LER-1993-001, :on 930225,several Design Discrepancies in SW & Reactor Equipment Cooling Sys Identified.Caused by Piping Configuration Error During Plant Const.Mechanical & Electrical Mods Will Be Made ‎ (← links)
  • 05000298/LER-1982-013-03, /03L-0:on 820607,during Performance of Snubber Operability Test,Two Mechanical Shock Suppressors, RR-SNUB-SS7A1 & RR-SNUB-SS7B1,found Inoperable.Caused by Overload of Snubbers.Snubbers Replaced ‎ (← links)
  • 05000298/LER-1982-012-03, /03L-0:on 820522,during Reactor Vessel Head Removal for Refueling,Closure Stud Nuts Were Improperly Detensioned.Caused by Personnel Error.Personnel Informed of Mistake & Procedure Checklist Revised ‎ (← links)
  • 05000298/LER-1982-011-03, /03-0:on 820514,isolation Valve RR-740AV Failed to Close.Caused by Dirty Solenoid Slug.Solenoid Valve Replaced ‎ (← links)
  • 05000298/LER-1982-010-03, /03L-0:on 820517,diesel Generator 1 & Output Breaker Tripped Shortly After Starting.Caused by Open Contact of Potential Transformer Disconnect Switch Interrupting Voltage to Overcurrent Relay Restraining Coil ‎ (← links)
  • 05000298/LER-1982-009-03, /03L-0:on 820428,suppression Chamber Level Instrument PC-LI-13 Failed full-scale.Caused by Personnel Error.Ref Water Leg Drained While Collecting Torus Water Sample.Level Transmitter Replaced.Sampling Valve Tagged ‎ (← links)
  • 05000298/LER-1982-008-03, /03L-0:on 820415,during Diagnostic Testing of Mechanical Snubbers,Model PSA-10 SN/544 Snubber Exceeded Specified Acceleration Rate.Caused by Improper Installation of Clutch Spring.Snubber Sent to Manufactures for Repair ‎ (← links)
  • 05000298/LER-1982-008, Forwards LER 82-008/03L-0.Detailed Event Analysis Submitted ‎ (← links)
  • 05000298/LER-1982-007-03, /03L-0:on 820324,differential Pressure Between Drywell & Suppression Chamber Reduced Below Tech Spec Limits During RHR Test Mode Operation.Caused by Nitrogen Flow from Drywell to Suppression Chamber.Return Piping to Be Modif ‎ (← links)
  • 05000298/LER-1982-007, Forwards LER 82-007/03L-0.Detailed Event Analysis Submitted ‎ (← links)
  • 05000298/LER-1982-006-03, /03L-0:on 820322,while Inerting Drywell,Ductwork Between Primary Containment & Reactor Bldg Ventilation Found Failed in Several Places,Preventing Oxygen Concentration & Differential Pressure from Being Established ‎ (← links)
  • 05000298/LER-1982-006, Forwards LER 82-006/03L-0.Detailed Event Analysis Submitted ‎ (← links)
  • 05000298/LER-1982-005-03, /03L-0:on 820221,MSIV-86A Found to Have Closing Time Faster than Tech Spec.Cause Unknown.Closing Time Adjusted & Control Valve Locked Into Required Position ‎ (← links)
  • 05000298/LER-1993-028, :on 930630,two Potentially Valves Were Inoperable Due to Inadequate Design of Valve Operators by Manufacturer.Modified Valve Operators ‎ (← links)
  • 05000298/LER-1993-010, :on 930331 & 0621,RPS Bus B Deenergized Due to Defective Under Frequency (Uf) Trip Unit Resulting in Unplanned Actuations of Several Esfs.Action Initiated to Permanently Remove Uf Feature ‎ (← links)
  • 05000298/LER-1993-027, :on 930308,standby Gas Treatment Sys Unable to Establish & Maintain Reactor Bldg Pressure + or - 0.25 Inches Water Gauge Under Calm Wind Conditions.Evaluation of Secondary Containment Operability in Progress ‎ (← links)
  • 05000298/LER-1993-023, :on 930528,fuel Assemblies Loaded Into Reactor Core Without Control Rods Fully Inserted,In Violation of TS 3.10.A.2.Caused by Need to Reposition Fuel Support Piece. Training Will Be Revised ‎ (← links)
  • 05000298/LER-1993-024, :on 930527,discovered That Testing of Four Reactor Vessel Low Water Level RPS Sensors Not Completed as Scheduled.Caused by Personnel Error.Stroke Testing Suspended & Surveillance Testing Completed ‎ (← links)
  • 05000298/LER-1993-021, :on 930611,determined That RB Ventilation Exhaust Inboard Isolation Valve HV-AOV-261AV Inoperable & Open Due to Personnel Error.Subj Valve Manually Closed. Proposed Change to TS Will Be Submitted ‎ (← links)
  • 05000298/LER-1993-020, :on 930507,determined That H2/O2 Sys Not Leak Tested to Verify Primary Containment Integrity During Testing of Sys.Caused by Failure to Have Administrative Controls in Place.Pressure Testing Conducted ‎ (← links)
  • 05000298/LER-1993-019, :on 930501,nonconservative Testing Methodology Discovered During LLRT Due to Nonconservative Interpretation of Info Supplied by Valve Mfg.Testing Conducted for Valves Not Previously Tested ‎ (← links)
  • 05000298/LER-1993-017, :on 930428,discovered That Hourly Fire Watch Patrol for RB Per TS Had Not Been Performed.Caused by Personnel Error.Review of Fire Watch Patrol Implementation Process Will Be Conducted ‎ (← links)
  • 05000298/LER-1993-015, :on 930420,design Discrepancy in HPCI Sys Identified.Caused by Design Deficiency in Original Design. Mods Will Be Made to Startup from Current Refueling Outage to Correct Design Discrepancy ‎ (← links)
  • 05000298/LER-1993-014, :on 930316,small through-wall Leak Developed on High Pressure Side of SW Throttle Valve.Caused by Inadequate Valve Design.Frequency of Visual Insp of Valve Internals Will Be Increased to Once Per Cycle ‎ (← links)
  • 05000298/LER-1993-013, :on 930415,determined That as-found Setpoint for Seven SRVs Not within TS Limit.Caused by Lift Setpoint Discrepancies of Srvs.Review of Setpoint Data Will Be Performed ‎ (← links)
  • 05000298/LER-1993-012, :on 930414,violation of Primary Containment Integrity Occurred.Caused by Personnel Error.Procedure Change Being Made to Eliminate Test Return Line Venting When Primary Containment Integrity Required ‎ (← links)
  • 05000298/LER-1993-011, :on 930308,max Differential Pressure Between Reactor Bldg & External Environ of -0.22-inches Water Gauge Exceeded TS Required Min.Caused by Lack of Loop Seal on Rupture Seal Drain Line.Seals Replaced ‎ (← links)
  • 05000298/LER-2019-003, Division 2 Service Water Discharge Blockage Resulting in Unplanned Service Water Inoperability ‎ (← links)
  • 05000298/LER-1990-005, :on 900430,reactor Protection Sys B Motor Generator Set Output Breaker Tripped.Caused by Equipment Malfunction & Preventive Maint Program Deficiency.Sys Restored to Pretrip Operational State ‎ (← links)
  • 05000298/LER-1990-004, :on 900413,ESF Group Isolations & Diesel Generator Starts Occurred Due to Equipment Malfunction & Personnel Error.Equipment Repaired,Manual Disconnect Operating Location Labeled & Personnel Trained ‎ (← links)
  • 05000298/LER-1982-004-03, /03L-0:on 820109,during Planned Power Reduction, Min Critical Power Ratio Was Below Operating Limit W/O Initiation of Corrective Actions Required by Tech Specs. Caused by Personnel Error.Procedures Will Be Revised ‎ (← links)
  • 05000298/LER-1982-004, Forwards LER 82-004/03L-0.Detailed Event Analysis Submitted ‎ (← links)
  • 05000298/LER-1982-003-03, /03L-0:on 820126,overload Alarm Condition Received While Closing Valve RHR-MO-26B,caused by Motor Brake Coil Failing to Release.New Motor & Brake Installed & Tested Satisfactorily ‎ (← links)
  • 05000298/LER-1982-001-03, /03L-0:on 820122,reactor Vessel Level Switch NBI-LIS-72C Failed to Trip at Tech Spec Setpoint.Caused by Misalignment of Switch Mechanism.New Switch Calibr & Installed ‎ (← links)
  • 05000298/LER-1982-003, Forwards LER 82-003/03L-0.Detailed Event Analysis Encl ‎ (← links)
  • 05000298/LER-1982-001, Forwards LER 82-001/03L-0.Detailed Event Analysis Submitted ‎ (← links)
  • 05000298/LER-1982-002-03, /03L-0:on 820121,during Routine Surveillance Testing NBI-LIS-101A Found to Trip at Lower than Tech Spec Limits.Caused by Barton Model 288 Switch Actuating at Random Positions.Switch Replaced ‎ (← links)
  • 05000298/LER-1982-002, Forwards LER 82-002/03L-0.Detailed Event Analysis Submitted ‎ (← links)
  • 05000298/LER-1981-025-04, /04T-0:on 811224,during Full Power,Discharge Was Made from Floor Drain Sample Tank W/O Adequate Sampling & Analysis of Batch.Caused by Personnel Error.Liquid Discharge Procedures Being Revised.Personnel Reprimanded ‎ (← links)
  • 05000298/LER-1981-025, Forwards LER 81-025/04T-0.Detailed Event Analysis Encl ‎ (← links)
  • 05000298/LER-1981-026-03, /03L-0:on 811223,switches NBI-LIS-01A & NBI-LIS- 101B Found Set at Level Lower That Tech Spec Limits.Caused by Setpoint Drift.Switches Returned to Correct Setpoints. Instrument Drift to Be Closely Monitored ‎ (← links)
  • 05000298/LER-1981-026, Forwards LER 81-026/03L-0 ‎ (← links)
  • 05000298/LER-1981-024-03, /03L-0:on 811106,safety Relief Valve 71-D Failed to Close After Test.Caused by Failure of Solenoid Plunger to Drop Out When Solenoid de-energized.Solenoid Replaced ‎ (← links)
  • 05000298/LER-1981-024, Forwards LER 81-024/03L-0.Detailed Event Analysis Encl ‎ (← links)
  • 05000298/LER-1993-022, :on 930514,emergency Transformer Low Voltage Alarm Received & Actual Low Voltage Condition Did Not Exist.Caused by Human Factors & Unanticipated Design Problems.Addl Input Provided to Window ‎ (← links)
  • 05000298/LER-1993-018, :on 930430,potential Single Failure Vulnerability Noted W/Single Inlet Damper in Common Supply Duct.Caused by Faulty Original Design.Inlet Damper Sealed Open to Eliminate Single Failure ‎ (← links)
  • 05000298/LER-1993-016, :on 930422,during Performance of Surveillance Test on CR HVAC Sys Radiation Monitor RMV-RM-1,CR HVAC Sys Did Not Isolate & Transfer to Emergency Bypass Mode.Caused by Personnel Error.Wiring Error Corrected ‎ (← links)
  • 05000298/LER-1993-009, :on 920329,discovered Potential for Inoperability of solenoid-operated Valves During Evaluation Per GL 91-15.Caused by Failure to Anticipate Problems of Overpressurization.Valves Replaced ‎ (← links)
  • 05000298/LER-1993-006, :on 930316,two Fire Barrier Doors in RB Found Open & Obstructed W/No Fire Watch Assigned.Caused by Personnel Error.Review of Fire Watch Implementation Process Will Be Conducted to Prevent Recurrence ‎ (← links)
  • 05000298/LER-1993-005, :on 930310,excessive Primary Containment Leakage Discovered During Local Leak Rate Testing of Reactor Check Valves.Caused by Equipment Deficiency.Valve Body & Disc Being Precision line-bored ‎ (← links)
  • 05000298/LER-1993-004, :on 930308,discovered That Documentation for Installation of Temporary Seals in RB Exterior Wall on 930306 Incomplete Due to Procedural Deficiencies.Procedures Revised to Ensure Guidance Re Temporary Seal Installation ‎ (← links)
  • 05000298/LER-1993-003, :on 930306,Group Isolation & Loss of Shutdown Cooling Due to Inadvertent 4160 Vac Breaker Trip.Caused by Personnel error.Self-checking Training Will Be Enhanced & Addl Labeling & Visual Identification Aids Being Evaluated ‎ (← links)
  • 05000298/LER-1993-002, :on 930202,NRC Inspector Discovered That Fire Watchman Unaware That Thermo-Lag Fire in Assigned Area Declared Inoperable on 920625,during Interview.Personnel re-familiarized w/Thermo-Lag Areas of Concern ‎ (← links)
  • 05000298/LER-1990-003, :on 900328,safety/relief Valve & Safety Valve Setpoint Variance Not within Tech Spec Limits.Cause Not Determined.Valves Inspected,Refurbished & Satisfactorily Retested at Wyle Labs Before Return to Site ‎ (← links)
  • 05000298/LER-1990-002, :on 900303,actuation of ESF Group Isolations Occurred.Caused by Design Characteristics & Required Trip Sys Setting.Reactor Vessel Water Levels Recovered Through Operation of Feedwater Sys & Isolations Reset ‎ (← links)
  • 05000298/LER-1981-023-03, /03L-0:on 811026,uncalibr Temp Switch Installed in MS-TS-1480 During 1981 Refueling Outage.Caused by Technician Error.Technicians Counseled.Will Color Code Switches & Revise Surveillance Procedure ‎ (← links)
  • 05000298/LER-1981-023, Forwards LER 81-023/03L-0.Detailed Event Analysis Submitted ‎ (← links)
  • 05000298/LER-1981-022-03, /03L-0:on 810912,blown Fuse in Valve Motor Circuit Disabled Valve & Reactor Core Isolation Cooling Sys.Caused by Motor Grounded by Grease That Penetrated Defective Seal in Valve Operator & Into Armature.Motor & Seal Replaced ‎ (← links)
  • 05000298/LER-1981-022, Forwards LER 81-022/03L-0.Detailed Event Analysis Also Submitted ‎ (← links)
  • 05000298/LER-1994-007, :on 940413,HPCI Sys Declared Inoperable.Caused by Lack of Sufficient Restraint on Tubing.Corrective Action: Tubing Placed Back on Fitting & Clamp Was Retensioned.W/ ‎ (← links)
  • 05000298/LER-1992-020, :on 920130,containment Level Instruments Were Removed & re-installed Without Being Declared Inoperable. Caused by Personnel Failure to Follow Procedures.Operators Retrained ‎ (← links)
  • 05000298/LER-1982-025-03, /03L-0:on 821222,coil of Reactor Protection Relay 915-5AK8C Overheated.Relay Did Not Fail.Cause Undetermined. Relay Replaced & Proper Operation Verified ‎ (← links)
  • 05000298/LER-1982-025, Forwards LER 82-025/03L-0.Detailed Event Analysis Submitted ‎ (← links)
  • 05000298/LER-1982-024-03, /03L-0:on 821221,pressure Switch RHR-PS-120A Setpoint Found Outside Range Specified in Tech Specs.Caused by Failed Diaphragm.Pressure Switch Adjusted & Subsequent Testing Showed Nonrepeatable Trip Point.Switch Replaced ‎ (← links)
  • 05000298/LER-1982-024, Forwards LER 82-024/03L-0.Detailed Event Analysis Submitted ‎ (← links)
  • 05000298/LER-1982-022-03, /03L-0:on 821025,RHR Time Delay Relay 10A-K45A Failed to Operate within Required Time Limits.Caused by Setpoint Being Set Too Conservatively.Relay Readjusted & Correct Operation Verified ‎ (← links)
  • 05000298/LER-1982-021-03, /03L-0:on 821023,relay 917-16A-K44B Failed to Open Contacts When de-energized.Cause Not Determined.Relay Replaced & Correct Operation Verified.Monitoring Program Implemented to Determine Need for Generic Replacement ‎ (← links)
  • 05000298/LER-1982-022, Forwards LER 82-022/03L-0.Detailed Event Analysis Submitted ‎ (← links)
  • 05000298/LER-1982-021, Forwards LER 82-021/03L-0.Detailed Event Analysis Submitted ‎ (← links)
  • 05000298/LER-1994-020, :on 940901,discovered That Elapsed Time Meters Installed in Essential CR HVAC & SGTS Due to Defective Procedures at Time of Installation.Crefs & SGTS Declared Inoperable ‎ (← links)
  • 05000298/LER-1983-008-03, /03L-0:on 830530,HFA Relay 9-17-16A K6B Contacts Failed to Open.Cause Not Determined.Relay Coil Replaced. Systematic Replacement of All Relays within 4-yr Period planned.w/830628 Ltr ‎ (← links)
  • 05000298/LER-1990-001, :on 900124,outboard Steam Supply Line Isolation Valve Unexpectedly Closed During Surveillance Testing,Causing Isolation of HPCI Sys.Caused by Procedural Inadequacy.Test Procedure Will Be Upgraded ‎ (← links)
  • 05000298/LER-1981-021-03, /03L-0:on 810728,during Performance of Surveillance Procedure on Diesel Generator 2,injection Line Failed.Caused by Metal Fatigue & Vibration.Component Replaced ‎ (← links)
  • 05000298/LER-1981-021, Forwards LER 81-021/03L-0.Detailed Event Rept Submitted ‎ (← links)
  • 05000298/LER-1950-298, Notifies That LER 50-298/79-31 Was Voided & Will Not Appear in NRC Files ‎ (← links)
  • 05000298/LER-1981-020-03, /03L-0: on 810728, During Procedure Returning Diesel Generator 1 to Svc After Flexible Fuel Line Leak, Control Air Line Fitting Failed Causing Generator to Shut Down. Caused by Broken Air Line Due to Crimped Ferrule ‎ (← links)
  • 05000298/LER-1981-020, Forwards LER 81-020/03L-0. Detailed Event Analysis Also Submitted ‎ (← links)
  • 05000298/LER-1981-019-03, /03L-0:on 810728,during Surveillance to Prove Operability of Diesel Generator 1,fuel Supply Hose Developed Leak.Caused by Excessive Localized Flexure & Vibration. Hose Replaced ‎ (← links)
  • 05000298/LER-1981-019, Forwards LER 81-019/03L-0.Detailed Event Analysis Submitted ‎ (← links)
  • 05000298/LER-1981-016-03, /03L-0:on 810610,core Thermal Power Calculation Performed by Process Computer Found Incorrect Due to Incorrect Feedwater Flow Value in Computer.Caused by Personnel Error in Changing Conversion Coefficient ‎ (← links)
  • 05000298/LER-1981-016, Forwards LER 81-016/03L-0.Detailed Event Analysis Submitted ‎ (← links)
  • 05000298/LER-1981-017-03, /03L-0:on 810613,reactor Core Isolation Cooling Sys Steam Supply Valve RCIC-MOV-M016 Failed to Open.Caused by Improperly Wired Motor Operator Circuit.Jumper Installed ‎ (← links)
  • 05000298/LER-1981-017, Forwards LER 81-017/03L-0.Detailed Event Analysis Encl ‎ (← links)
  • 05000298/LER-1981-018-03, /03L-0:on 810625,pressure Switch NBI-PS-52A Found W/Trip Point Less Conservative than Tech Spec.Apparently Caused by Setpoint Drift.Switch Readjusted.Setpoints for Switches Reset ‎ (← links)
  • 05000298/LER-1981-018, Forwards LER 81-018/03L-0.Detailed Event Analysis Encl ‎ (← links)
  • 05000298/LER-1981-015-03, /03L-0:on 810531,twelve Penetrations Were Found Leaking Excessively.Ten Caused by Normal Wear & Two by Improper Limitorque Operation.Valve Repairs Performed ‎ (← links)
  • 05000298/LER-1981-013-03, /03L-0:on 810528,during Testing of Station Battery Rated Load Test W/Plant in Cold shutdown,125 Volt Batteries 1A & 1B Discharged at Rate Greater than Required.Caused by Error in Reading Procedure.Procedure Will Be Revised ‎ (← links)
  • 05000298/LER-1981-015, Forwards LER 81-015/03L-0.Detailed Event Analysis Also Submitted ‎ (← links)
  • 05000298/LER-1981-013, Forwards LER 81-013/03L-0.Detailed Event Analysis Encl ‎ (← links)
  • 05000298/LER-1981-014-03, /03L-0:on 810608,during Testing,Hpci Pump Turbine Tripped on Overspeed Prior to Reaching Rated Sys Flow.Sys Declared Inoperable.Caused by Improper Valve line-up Procedure.Valve Throttled & Tested ‎ (← links)
  • 05000298/LER-1981-014, Forwards LER 81-014/03L-0.Detailed Event Analysis Encl ‎ (← links)
  • 05000298/LER-1981-012-03, /03L-0:on 810519,during Testing HPCI-PS-68D Tripped at 89 Psig Instead of 100 Psig Tech Spec Limit. Caused by Random Instrument Drift.Instrument Immediately Recalibr & Returned to Svc ‎ (← links)
  • 05000298/LER-1981-012, Forwards LER 81-012/03L-0.Detailed Event Analysis Encl ‎ (← links)
  • 05000298/LER-1981-011-03, /03L-0:on 810528,during Insp of Unexpected Alarm, CS Header Break Detection Instrument Switches Found Piped to Incorrect Lines.Caused by Connection to Wrong Line at Drywell Penetration.Instruments Connected to Proper Lines ‎ (← links)
  • 05000298/LER-1981-011, Forwards LER 81-011/03L-0.Detailed Event Analysis Submitted ‎ (← links)
  • 05000298/LER-1981-009-03, /03L-0:on 810503,two Pacific Scientific Model PSA-10 Mechanical Shock Suppressors Found Inoperable.Cause Under Evaluation.Snubber Replaced ‎ (← links)
  • 05000298/LER-1981-009, Forwards LER 81-009/03L-0.Detailed Event Analysis Submitted ‎ (← links)
  • 05000298/LER-1981-010-03, /03L-0:on 810505,static Inverter 1A Spike Suppressor Capacitor Failed Causing Inverter to Become Inoperable.Caused by Aging & Effects of High Ripple Charger ‎ (← links)
  • 05000298/LER-1981-010, Forwards LER 81-010/03L-0 ‎ (← links)
  • 05000298/LER-1981-002-03, /03L-0:on 810213,brass Filings Found in Oil Sump of Outboard Motor Bearing of RHR Svc Water Booster Pump. Caused by Loose Inboard Motor Fan & Set Screw.Fan Repaired & Second Set Screw Added ‎ (← links)
  • 05000298/LER-1981-002, Forwards LER 81-002/03L-0.Detailed Event Analysis Encl ‎ (← links)
  • 05000298/LER-1981-003-03, /03L-0:on 810223,RHR-MO-26B Motor Amps Increased & Remained Excessively High When Valve Reached Closed Position.Caused by Limit Switch on Limitorque SMB-O Valve Motor Operator Not Opening & de-energizing Starter ‎ (← links)
  • 05000298/LER-1981-003, Forwards LER 81-003/03L-0.Detailed Event Analysis Encl ‎ (← links)
  • 05000298/LER-1989-026, :on 891125,reactor Scram Occurred Due to Closure of Outboard Msivs.Caused by post-filter Media Ignition by Hot Air or Particles from Dryer.Air Dryer B Disassembled & Inspected ‎ (← links)
  • 05000298/LER-1981-007-03, /03L-0:on 810426,diesel Generator 1 Cylinder Temp Increased During Surveillance Procedure 6.5.12.1 W/Reactor in Cold Shutdown.Caused by Temporary Air Pressure Test Gauge Which Fell Off Control Air Supply ‎ (← links)
  • 05000298/LER-1981-007, Forwards LER 81-007/03L-0.Detailed Event Analysis Submitted ‎ (← links)
  • 05000298/LER-1981-008-03, /03L-0:on 810426,reactor Vessel Level Switch LIS-72C,Switch-4,caused Continuous Annunciator 9-3-1/8-2 Alarm.Caused by Failure of Yarway Model 4418C Level Indicating Switch,Due to Film Buildup Between Contacts ‎ (← links)
  • 05000298/LER-1981-008, Forwards LER 81-008/03L-0.Detailed Event Analysis Encl ‎ (← links)
  • 05000298/LER-1980-047-03, /03L-0:on 801117,RHR Loop a Suppression Pool Cooling Inboard Throttle Valve Found Inoperable.Caused by Key Failure Between Motor Pinion Gear & Shaft Due to Wrong Key Matl Installed.Motor,Pinion Gear & Key Replaced ‎ (← links)
  • 05000298/LER-1980-047, Forwards LER 80-047/03L-0.Detailed Event Analysis Also Submitted ‎ (← links)
  • 05000298/LER-1981-006-03, /03L-0:on 810414,during Normal Surveillance Testing of Scram Discharge Header Cms,Three of Four Channels Installed Failed.Caused by Component Failure.Marginal Crystals Used in Transmitter Replaced by Manufacturer ‎ (← links)
  • 05000298/LER-1981-006, Forwards LER 81-006/03L-0.Detailed Event Analysis Submitted ‎ (← links)
• 05000298/LER-1982-002-03, /03L-0:on 820121,during Routine Surveillance Testing NBI-LIS-101A Found to Trip at Lower than Tech Spec Limits.Caused by Barton Model 288 Switch Actuating at Random Positions.Switch Replaced ‎ (← links)
• 05000298/LER-1982-002, Forwards LER 82-002/03L-0.Detailed Event Analysis Submitted ‎ (← links)
• 05000298/LER-1982-025-03, /03L-0:on 821222,coil of Reactor Protection Relay 915-5AK8C Overheated.Relay Did Not Fail.Cause Undetermined. Relay Replaced & Proper Operation Verified ‎ (← links)
• 05000298/LER-1982-025, Forwards LER 82-025/03L-0.Detailed Event Analysis Submitted ‎ (← links)
• 05000298/LER-1982-024-03, /03L-0:on 821221,pressure Switch RHR-PS-120A Setpoint Found Outside Range Specified in Tech Specs.Caused by Failed Diaphragm.Pressure Switch Adjusted & Subsequent Testing Showed Nonrepeatable Trip Point.Switch Replaced ‎ (← links)
• 05000298/LER-1982-024, Forwards LER 82-024/03L-0.Detailed Event Analysis Submitted ‎ (← links)
• 05000298/LER-1982-022-03, /03L-0:on 821025,RHR Time Delay Relay 10A-K45A Failed to Operate within Required Time Limits.Caused by Setpoint Being Set Too Conservatively.Relay Readjusted & Correct Operation Verified ‎ (← links)
• 05000298/LER-1982-021-03, /03L-0:on 821023,relay 917-16A-K44B Failed to Open Contacts When de-energized.Cause Not Determined.Relay Replaced & Correct Operation Verified.Monitoring Program Implemented to Determine Need for Generic Replacement ‎ (← links)
• 05000298/LER-1982-022, Forwards LER 82-022/03L-0.Detailed Event Analysis Submitted ‎ (← links)
• 05000298/LER-1982-021, Forwards LER 82-021/03L-0.Detailed Event Analysis Submitted ‎ (← links)