05000220/LER-1999-005-01, :on 990801,RT During Plant Startup on IRM Spiking Was Noted.Caused by electro-magnetic Interference. Inspected,Cleaned,Burnished & Tested IRM 11 Range Switch. with1999-08-30030 August 1999
- on 990801,RT During Plant Startup on IRM Spiking Was Noted.Caused by electro-magnetic Interference. Inspected,Cleaned,Burnished & Tested IRM 11 Range Switch. with
05000220/LER-1999-004-01, :on 990723,reactor Scram Was Noted.Caused by Mechanical Pressure Regulator Suppressor Valve Failure. Cleaned Pressure Suppressor Valve & Provided Guidance for Valve Disassembly & Insp.With1999-08-23023 August 1999
- on 990723,reactor Scram Was Noted.Caused by Mechanical Pressure Regulator Suppressor Valve Failure. Cleaned Pressure Suppressor Valve & Provided Guidance for Valve Disassembly & Insp.With
05000220/LER-1999-003-01, :on 990320,noted That Plant Operated with Average Planear LHGR Exceeding TS Limits.Caused by Inadequate Interface Design Between Color Graphics Terminal & 3-D Monicore Sys.Lowered Reactor Power.With1999-04-22022 April 1999
- on 990320,noted That Plant Operated with Average Planear LHGR Exceeding TS Limits.Caused by Inadequate Interface Design Between Color Graphics Terminal & 3-D Monicore Sys.Lowered Reactor Power.With
05000220/LER-1999-002, :on 990217,noted That ASME Code Preservice Exams Had Not Been Performed on Emergency Condensers.Caused by Misinterpretation of ASME Code Requirements.Required Preservice Exams Were Completed on 990218.With1999-03-19019 March 1999
- on 990217,noted That ASME Code Preservice Exams Had Not Been Performed on Emergency Condensers.Caused by Misinterpretation of ASME Code Requirements.Required Preservice Exams Were Completed on 990218.With
05000220/LER-1999-001, :on 990125,noted That Plant Operated Outside Design Basis Due to Failure to Revise Satellite pre-fire Plans.Satellite Copies of pre-fire Plans Were Revised & Procedure Re pre-fire Plans Was Revised.With1999-02-24024 February 1999
- on 990125,noted That Plant Operated Outside Design Basis Due to Failure to Revise Satellite pre-fire Plans.Satellite Copies of pre-fire Plans Were Revised & Procedure Re pre-fire Plans Was Revised.With
05000220/LER-1998-019-01, :on 981110,ASME Section XI ISI Was Missed. Caused by Cognitive Error Involving Technical Inaccuracies. Util Will Revise Second 10-yr Interval ISI Program Plan to Incorporate Visual Exam Requirements.With1998-12-10010 December 1998
- on 981110,ASME Section XI ISI Was Missed. Caused by Cognitive Error Involving Technical Inaccuracies. Util Will Revise Second 10-yr Interval ISI Program Plan to Incorporate Visual Exam Requirements.With
05000220/LER-1998-018-01, :on 981006,determined That Actual Total Crds Flow Exceeded Indicated Crds Total Flow.Caused by Degraded Crds Filter Bypass Valve.Plant Has Been Limited to 1847 Mwt & Shift Check Procedure Was Revised.With1998-11-0505 November 1998
- on 981006,determined That Actual Total Crds Flow Exceeded Indicated Crds Total Flow.Caused by Degraded Crds Filter Bypass Valve.Plant Has Been Limited to 1847 Mwt & Shift Check Procedure Was Revised.With
05000220/LER-1998-017-01, :on 980902,breach of Primary Containment Was Noted.Caused by Personnel Error in 1994.Immediately Upon Discovery,Asss Directed That CS Heat Exchanger Vent Valves Be Closed.With1998-10-0202 October 1998
- on 980902,breach of Primary Containment Was Noted.Caused by Personnel Error in 1994.Immediately Upon Discovery,Asss Directed That CS Heat Exchanger Vent Valves Be Closed.With
05000220/LER-1998-016-01, :on 980820,determined That CS Pump Motor Bearing Cooling Flow Outside Design Basis Requirement.Caused by Error in Maint Reassembly That Crimped Cooling Coil.Cs Pump 122 Repaired.With1998-09-21021 September 1998
- on 980820,determined That CS Pump Motor Bearing Cooling Flow Outside Design Basis Requirement.Caused by Error in Maint Reassembly That Crimped Cooling Coil.Cs Pump 122 Repaired.With
05000220/LER-1998-015-01, :on 980804,breach of Primary Containment Was Noted.Caused by Personnel Error.Closed Heat Exchanger Vent Valves & Restored Torus Pressure.With1998-09-0303 September 1998
- on 980804,breach of Primary Containment Was Noted.Caused by Personnel Error.Closed Heat Exchanger Vent Valves & Restored Torus Pressure.With
ML20236T5911998-07-20020 July 1998
LER 98-S01-00:on 980618,security Force Member Left Nine Mile Point,Unit 2 Vehicle Gate Unattended Without Ensuring,Gate Alarm Had Been Reactivated.Caused by Inadequate Work Practice.Vehicle Gate Alarm Was Activated
05000220/LER-1998-014-01, :on 980617,control Room Staffing Was in Violation of TS Due to Unqualified SRO Assuming SRO Shift Duties.Caused by Inadequate Managerial Methods.Crew Remediated & Lessons Learned Memo Distributed1998-07-17017 July 1998
- on 980617,control Room Staffing Was in Violation of TS Due to Unqualified SRO Assuming SRO Shift Duties.Caused by Inadequate Managerial Methods.Crew Remediated & Lessons Learned Memo Distributed
05000220/LER-1998-013-01, :on 980604,valve Repositioning Caused non- Conformance W/App R Safe Shutdown Analysis. Caused by Failure to Include Valves 40-26 & 40-27 in UFSAR Description of App R.Circuit Breakers 40-30 & 40-31 Opened1998-07-0606 July 1998
- on 980604,valve Repositioning Caused non- Conformance W/App R Safe Shutdown Analysis. Caused by Failure to Include Valves 40-26 & 40-27 in UFSAR Description of App R.Circuit Breakers 40-30 & 40-31 Opened
05000410/LER-1998-017, :on 980602,control Room Ventilation Sys Was Declared Inoperable.Caused by Original Design Deficiency. Mod Designed,Tested & Implemented Prior to Startup from RF06 to Correct Design Deficiency1998-07-0202 July 1998
- on 980602,control Room Ventilation Sys Was Declared Inoperable.Caused by Original Design Deficiency. Mod Designed,Tested & Implemented Prior to Startup from RF06 to Correct Design Deficiency
05000220/LER-1998-012-01, :on 980521,determined That Fire Dampers Installed in Supply & Return Ducts to Auxiliary CR Would Fail Closed as Result of Loop.Caused by Inadequate Evaluation.Modified Affected Fire Dampers1998-06-22022 June 1998
- on 980521,determined That Fire Dampers Installed in Supply & Return Ducts to Auxiliary CR Would Fail Closed as Result of Loop.Caused by Inadequate Evaluation.Modified Affected Fire Dampers
05000410/LER-1998-004, :on 980302,TS Required LSFT of Level 8 Trip of Main Turbine Was Missed.Caused by Knowledge Deficiency of EHC Sys.Revised Applicable LSFT Procedures Prior to Refueling Outage 61998-06-0404 June 1998
- on 980302,TS Required LSFT of Level 8 Trip of Main Turbine Was Missed.Caused by Knowledge Deficiency of EHC Sys.Revised Applicable LSFT Procedures Prior to Refueling Outage 6
05000220/LER-1998-011-01, :on 980503,inadvertent Actuation of RPS Circuitry Occurred Due to Personnel Error.Fuse Was Replaced & SDC Was Placed Into Svc1998-06-0202 June 1998
- on 980503,inadvertent Actuation of RPS Circuitry Occurred Due to Personnel Error.Fuse Was Replaced & SDC Was Placed Into Svc
05000220/LER-1998-010-01, :on 980430,inadequate Reactor Vessel Level Instruments Were Noted.Caused by Inaccurate Input Parameter. Revised Calculations & Associated Instruments Were Recalibrated1998-06-0101 June 1998
- on 980430,inadequate Reactor Vessel Level Instruments Were Noted.Caused by Inaccurate Input Parameter. Revised Calculations & Associated Instruments Were Recalibrated
05000220/LER-1998-008-01, :on 980428,RWM TS SR Were Not Met for Previous Shutdowns.Caused by Failure to Develop Procedures Which Tested Rwm.Revised RWM Sp & Verified Adequacy of Operations Sps Which Are Performed on Conditional Basis1998-05-28028 May 1998
- on 980428,RWM TS SR Were Not Met for Previous Shutdowns.Caused by Failure to Develop Procedures Which Tested Rwm.Revised RWM Sp & Verified Adequacy of Operations Sps Which Are Performed on Conditional Basis
05000220/LER-1998-009-01, :on 980428,missing Fire Proofing Matl from Structural Steel,Was Discovered.Caused by Construction Drawing Not Followed by Contractor.Breach Permit & Compensatory Fire Patrols Initiated1998-05-28028 May 1998
- on 980428,missing Fire Proofing Matl from Structural Steel,Was Discovered.Caused by Construction Drawing Not Followed by Contractor.Breach Permit & Compensatory Fire Patrols Initiated
05000220/LER-1998-007-02, :on 980424,SRO Was Not in CR for Two Minutes. Caused by Insufficient Awareness of Assistant Station SS Role & Actions on Nuclear Safety.Counseled Assistant Station SS & Relieved Supervisor of Licensed Duties1998-05-26026 May 1998
- on 980424,SRO Was Not in CR for Two Minutes. Caused by Insufficient Awareness of Assistant Station SS Role & Actions on Nuclear Safety.Counseled Assistant Station SS & Relieved Supervisor of Licensed Duties
05000220/LER-1998-006-01, :on 980421,design Deficiency Associated W/Crevs RMs Was Noted.Caused by Engineering Personnel Not Performing Adequate Evaluations.Modified Sys Logic to Initiate CREVS Directly from MSLB & LOCA Signals1998-05-21021 May 1998
- on 980421,design Deficiency Associated W/Crevs RMs Was Noted.Caused by Engineering Personnel Not Performing Adequate Evaluations.Modified Sys Logic to Initiate CREVS Directly from MSLB & LOCA Signals
05000220/LER-1998-004-01, :on 980411,identified That Containment Spray Flow Control Valve 80-118 Had Been Left Open Since 980407. Caused by Failure by Chief Shift Operator to Properly Follow Procedure.Procedures Revised1998-05-11011 May 1998
- on 980411,identified That Containment Spray Flow Control Valve 80-118 Had Been Left Open Since 980407. Caused by Failure by Chief Shift Operator to Properly Follow Procedure.Procedures Revised
05000220/LER-1998-003-01, :on 980304,plant Exceeded 100% Rated Core Thermal Power & Exceeded Power/Flow Relationship of TS 3.1.7.d.Caused by Inadequate Managerial Methods.Implemented Conservative Interim Guidance to Ensure Correct Power Level1998-04-0303 April 1998
- on 980304,plant Exceeded 100% Rated Core Thermal Power & Exceeded Power/Flow Relationship of TS 3.1.7.d.Caused by Inadequate Managerial Methods.Implemented Conservative Interim Guidance to Ensure Correct Power Level
05000220/LER-1998-002-01, :on 980220,failure of CR Emergency Ventilation to Meet Differential Pressure Requirements Occurred.Caused by Inadequate Change Management.Engineering Supporting Analysis Was Completed to Justify Operations1998-03-23023 March 1998
- on 980220,failure of CR Emergency Ventilation to Meet Differential Pressure Requirements Occurred.Caused by Inadequate Change Management.Engineering Supporting Analysis Was Completed to Justify Operations
05000220/LER-1998-001-01, :on 980129,violation of Secondary Containment Was Noted.Caused by Knowledge Deficiency of Personnel Assessing Plant Impact of Maint Work.Plant Impact Statements in Maint Procedure Have Changed1998-03-0202 March 1998
- on 980129,violation of Secondary Containment Was Noted.Caused by Knowledge Deficiency of Personnel Assessing Plant Impact of Maint Work.Plant Impact Statements in Maint Procedure Have Changed
05000410/LER-1995-011, :on 951115,discovered That 100% of Rated Core Thermal Power Exceeded During Fuel Cycles 4 & 5 Due to Core Thermal Power Calculation Methodology Error.Reduced Power & Established Administrative Limit on Power1995-12-15015 December 1995
- on 951115,discovered That 100% of Rated Core Thermal Power Exceeded During Fuel Cycles 4 & 5 Due to Core Thermal Power Calculation Methodology Error.Reduced Power & Established Administrative Limit on Power
05000220/LER-1995-003-01, :on 950516,discovered That Three I&C Sps Not Performed in Compliance W/Frequency in TS SRs Due to Cognitive Personnel Error.Missed Surveillances Performed & Affected I&C Procedures Will Be Revised1995-06-15015 June 1995
- on 950516,discovered That Three I&C Sps Not Performed in Compliance W/Frequency in TS SRs Due to Cognitive Personnel Error.Missed Surveillances Performed & Affected I&C Procedures Will Be Revised
05000410/LER-1993-010, :on 931108,HPCS Was Inoperable Due to Equipment Deficiency,Inadequate Managerial Methods & Poor Work Practices.Replaced Deficient Contactors & Restored Tap Setting.Also Reportable Per Part 211993-12-0808 December 1993
- on 931108,HPCS Was Inoperable Due to Equipment Deficiency,Inadequate Managerial Methods & Poor Work Practices.Replaced Deficient Contactors & Restored Tap Setting.Also Reportable Per Part 21
05000410/LER-1992-008, :on 920327,Unit 2 Experienced ESF Actuations. Caused by Personnel Error.Technician Involved Counseled, Procedure Revised & Directive to Help Minimize Risk of Relay State Verification Methods Issued1992-04-25025 April 1992
- on 920327,Unit 2 Experienced ESF Actuations. Caused by Personnel Error.Technician Involved Counseled, Procedure Revised & Directive to Help Minimize Risk of Relay State Verification Methods Issued
05000220/LER-1990-006-01, :on 891027,discovered Unverified Assumption in App R Safe Shutdown Analysis.Caused by Fire Protection Program Failure to Provide Detailed Procedural Instructions for Operator Actions.New Procedures Developed1990-08-10010 August 1990
- on 891027,discovered Unverified Assumption in App R Safe Shutdown Analysis.Caused by Fire Protection Program Failure to Provide Detailed Procedural Instructions for Operator Actions.New Procedures Developed
05000410/LER-1989-014, :on 890413,unit Reactor Experienced Reactor Scram Which Was Result of Turbine Trip Due to Actuation of Generator Protection Circuitry.Turbine Trip Caused by Disconnected Wire.Wire Relanded1989-05-15015 May 1989
- on 890413,unit Reactor Experienced Reactor Scram Which Was Result of Turbine Trip Due to Actuation of Generator Protection Circuitry.Turbine Trip Caused by Disconnected Wire.Wire Relanded
05000410/LER-1987-051, :on 870813,shutdown Cooling Sys Isolated & Tech Specs 3.4.9.2 Exceeded.Caused by Equipment Failure,Personnel Error & Procedural & Design Deficiencies.Shutdown Cooling Sys Manually Restored1988-08-22022 August 1988
- on 870813,shutdown Cooling Sys Isolated & Tech Specs 3.4.9.2 Exceeded.Caused by Equipment Failure,Personnel Error & Procedural & Design Deficiencies.Shutdown Cooling Sys Manually Restored
05000410/LER-1988-024, :on 880605,ESF Actuation Occurred Due to Resetting of Failed Radiation Monitor Microcomputer.Caused by Lack of Personnel Training.Defective Cards & Modules in RE14B Microcomputer & DRMS Panel Replaced1988-07-0101 July 1988
- on 880605,ESF Actuation Occurred Due to Resetting of Failed Radiation Monitor Microcomputer.Caused by Lack of Personnel Training.Defective Cards & Modules in RE14B Microcomputer & DRMS Panel Replaced
05000410/LER-1988-014, :on 880313,reactor Scram & ESF Actuations Occurred.Caused by Equipment Failure Due to Design Deficiency.Transmitter Replaced W/Upgraded Model & Temporary Mod Performed to Bypass Logic for Valves1988-04-12012 April 1988
- on 880313,reactor Scram & ESF Actuations Occurred.Caused by Equipment Failure Due to Design Deficiency.Transmitter Replaced W/Upgraded Model & Temporary Mod Performed to Bypass Logic for Valves
05000410/LER-1988-001, :on 880120,reactor Scram Occurred Due to Actual Low Water Level Condition.Caused by Design & Personnel Errors.Operator Disciplined & Mod Addressed Inadvertent Feedwater Control Valve Lockup1988-02-17017 February 1988
- on 880120,reactor Scram Occurred Due to Actual Low Water Level Condition.Caused by Design & Personnel Errors.Operator Disciplined & Mod Addressed Inadvertent Feedwater Control Valve Lockup
05000220/LER-1987-023-01, :on 870422,trip of Normal Reactor Bldg Ventilation & Initiation of Emergency Ventilation Occurred. Caused by Personnel Error.Fuse Replaced.On 871123,util Discovered LER Not Submitted for Event1987-12-22022 December 1987
- on 870422,trip of Normal Reactor Bldg Ventilation & Initiation of Emergency Ventilation Occurred. Caused by Personnel Error.Fuse Replaced.On 871123,util Discovered LER Not Submitted for Event
05000410/LER-1987-045, Corrected LER 87-045-00:on 870729,two Separate ESF Actuations Occurred.Caused by Lack of Administrative Controls & Personnel Error.Surveillance Procedures Revised to Prohibit Concurrent Performance1987-08-28028 August 1987
Corrected LER 87-045-00:on 870729,two Separate ESF Actuations Occurred.Caused by Lack of Administrative Controls & Personnel Error.Surveillance Procedures Revised to Prohibit Concurrent Performance
05000410/LER-1987-025, :on 870519,secondary Containment Isolation Signal Generated Due to Technician Relanding Lifted Lead Prematurely.Caused by Breakdown in Communications.Gaitronics Phone &/Or Headset Jack Installed1987-06-15015 June 1987
- on 870519,secondary Containment Isolation Signal Generated Due to Technician Relanding Lifted Lead Prematurely.Caused by Breakdown in Communications.Gaitronics Phone &/Or Headset Jack Installed
05000410/LER-1986-002-01, :on 861104,procedure N2-OSP-RMC-W0002 Ran for Over 2 H Thereby Violating Tech Specs.Caused by Personnel Error & Procedure Deficiency.Temporary Change Notice Issued to Procedure1987-04-13013 April 1987
- on 861104,procedure N2-OSP-RMC-W0002 Ran for Over 2 H Thereby Violating Tech Specs.Caused by Personnel Error & Procedure Deficiency.Temporary Change Notice Issued to Procedure
05000410/LER-1986-012, :on 861128 & 29,series of Related Automatic Initiations of Standby Gas Treatment Sys Occurred.Caused by Clogged Filters & Personnel Error.Approx 50% of First Stage Filters Replaced & Training Mod Initiated1987-03-25025 March 1987
- on 861128 & 29,series of Related Automatic Initiations of Standby Gas Treatment Sys Occurred.Caused by Clogged Filters & Personnel Error.Approx 50% of First Stage Filters Replaced & Training Mod Initiated
05000410/LER-1987-015, :on 870222,failure to Maintain Hourly Watch Patrol in Area W/Inoperable Fire Detection Sys Occurred. Caused by Change to Fire Watch Patrol Rover Schedule W/O Notifying Fire Chief.Personnel Counseled1987-03-24024 March 1987
- on 870222,failure to Maintain Hourly Watch Patrol in Area W/Inoperable Fire Detection Sys Occurred. Caused by Change to Fire Watch Patrol Rover Schedule W/O Notifying Fire Chief.Personnel Counseled
05000410/LER-1987-016, :on 870226,abandoned Penetration in Fire Wall Between Secondary Containment & Main Steam Tunnel Found Improperly Sealed.Caused by Personnel Error.Penetrations Reviewed & Fire Watch Established1987-03-23023 March 1987
- on 870226,abandoned Penetration in Fire Wall Between Secondary Containment & Main Steam Tunnel Found Improperly Sealed.Caused by Personnel Error.Penetrations Reviewed & Fire Watch Established
05000410/LER-1986-007, :on 861120,ESF Actuation Occurred.Caused by Two Electrical Protection Assemblies (Epas) Tripping Twice in 2 H Causing Loss of Power to Circuit Bus Due to Personnel Error During MSIV Testing.Epas Reset1987-03-18018 March 1987
- on 861120,ESF Actuation Occurred.Caused by Two Electrical Protection Assemblies (Epas) Tripping Twice in 2 H Causing Loss of Power to Circuit Bus Due to Personnel Error During MSIV Testing.Epas Reset
05000410/LER-1986-011, :on 861127 & 1208,automatic Initiation of Standby Gas Treatment Sys Divs I & II Occurred.Caused by Spurious Reactor Bldg Exhaust Ventilation Duct High Radiation Signals.Accumulator Added to Lines1987-03-18018 March 1987
- on 861127 & 1208,automatic Initiation of Standby Gas Treatment Sys Divs I & II Occurred.Caused by Spurious Reactor Bldg Exhaust Ventilation Duct High Radiation Signals.Accumulator Added to Lines
05000410/LER-1987-017, :on 870224,auto-initiation of Standby Gas Treatment Sys & Primary Containment Isolation Occurred. Caused by Breaker Being Opened on Reactor Protection Sys Power Supply While Performing Troubleshooting1987-03-16016 March 1987
- on 870224,auto-initiation of Standby Gas Treatment Sys & Primary Containment Isolation Occurred. Caused by Breaker Being Opened on Reactor Protection Sys Power Supply While Performing Troubleshooting
05000220/LER-1987-004, :on 870210,discovered That Instrument Control Surveillance Test Not Performed on 870116,per Tech Specs. Caused by Failure to Complete Rev to Test Procedure Prior to Scheduled Test.Procedures Revised1987-03-12012 March 1987
- on 870210,discovered That Instrument Control Surveillance Test Not Performed on 870116,per Tech Specs. Caused by Failure to Complete Rev to Test Procedure Prior to Scheduled Test.Procedures Revised
05000410/LER-1987-011, :on 870207,while at 0% Power,All Rods Experienced Reactor Scram.Caused by Bumping Piece of Steel Tubing Between Reactor & Water Level Instrumentation. Design Change Will Eliminate Problem1987-03-0909 March 1987
- on 870207,while at 0% Power,All Rods Experienced Reactor Scram.Caused by Bumping Piece of Steel Tubing Between Reactor & Water Level Instrumentation. Design Change Will Eliminate Problem
05000410/LER-1987-012, :on 870208,MSIV Closure Occurred on Low Condenser Vacuum Signal.Caused by Unusual & Complicated Set of Conditions That Precluded Running Surveillance Test W/O Adverse Consequences.Test Procedure Revised1987-03-0909 March 1987
- on 870208,MSIV Closure Occurred on Low Condenser Vacuum Signal.Caused by Unusual & Complicated Set of Conditions That Precluded Running Surveillance Test W/O Adverse Consequences.Test Procedure Revised
05000410/LER-1987-013, :on 870209,automatic Actuation of ESF Sys Occurred Due to Loss of Power to Class 1E Bus.Caused by Personnel Error.Training Mod Recommendation Submitted to Remind Operators to Assess Plant Conditions1987-03-0909 March 1987
- on 870209,automatic Actuation of ESF Sys Occurred Due to Loss of Power to Class 1E Bus.Caused by Personnel Error.Training Mod Recommendation Submitted to Remind Operators to Assess Plant Conditions