05000278/LER-1999-005-03, :on 990920,uplanned Esfas During Planned Mod Activitives in Main CR Were Noted.Caused by Inattention to Detail by Individuals Performing Work.All CR Mods Were Ceased to Allow Review of Mod Work Packages.With1999-10-20020 October 1999
- on 990920,uplanned Esfas During Planned Mod Activitives in Main CR Were Noted.Caused by Inattention to Detail by Individuals Performing Work.All CR Mods Were Ceased to Allow Review of Mod Work Packages.With
05000278/LER-1999-004-03, :on 990901,3A RPS Bus Was Inadvertently Deenergized,During Planned Mod Activities on Main CR Panel. Caused by Electrician Failing to Self Check Work.All CR Work Was Ceased Immediately & Shutdown Meeting Held1999-10-0101 October 1999
- on 990901,3A RPS Bus Was Inadvertently Deenergized,During Planned Mod Activities on Main CR Panel. Caused by Electrician Failing to Self Check Work.All CR Work Was Ceased Immediately & Shutdown Meeting Held
05000278/LER-1999-003-03, :on 990814,HPCIS Was Declared Inoperable Due to Erratic Behavior Resulting in Loss of Single High Train Safety Sys.Caused by Weakness in Procedural Guidance. Readjusted Hydraulic Governor Needle Valve.With1999-09-13013 September 1999
- on 990814,HPCIS Was Declared Inoperable Due to Erratic Behavior Resulting in Loss of Single High Train Safety Sys.Caused by Weakness in Procedural Guidance. Readjusted Hydraulic Governor Needle Valve.With
05000277/LER-1999-005-01, :on 990616,failure to Maintain Provisions of FP Program Occurred.Caused by Less than Adequate Engineering Rigor in Both Development & Review Analysis.Fire Watch Immediately Established.With1999-07-16016 July 1999
- on 990616,failure to Maintain Provisions of FP Program Occurred.Caused by Less than Adequate Engineering Rigor in Both Development & Review Analysis.Fire Watch Immediately Established.With
05000278/LER-1999-002-02, :on 990406,safeguard Sys to Unrelated Door Was Inadvertently Disabled by Security Alarm Station Operator. Caused by Noncompliance with Procedures & Less than Adequate Shift Turnover.Briefed Personnel on Event.With1999-05-0606 May 1999
- on 990406,safeguard Sys to Unrelated Door Was Inadvertently Disabled by Security Alarm Station Operator. Caused by Noncompliance with Procedures & Less than Adequate Shift Turnover.Briefed Personnel on Event.With
05000278/LER-1999-001-03, :on 990312,ESF Actuation of Rcics Occurred Due to High Steam Flow Signal During Sys Restoration.Temporary Change to Restoration Procedure Was Initiated to Open RCIC Outboard Steam Isolation Valve in Smaller Increments1999-04-0808 April 1999
- on 990312,ESF Actuation of Rcics Occurred Due to High Steam Flow Signal During Sys Restoration.Temporary Change to Restoration Procedure Was Initiated to Open RCIC Outboard Steam Isolation Valve in Smaller Increments
05000278/LER-1998-009-01, :on 981227,unplanned Esfa Were Noted.Caused by Transformer Insulator Failure.Replaced Failed Insulator. with1999-01-20020 January 1999
- on 981227,unplanned Esfa Were Noted.Caused by Transformer Insulator Failure.Replaced Failed Insulator. with
05000277/LER-1998-008-01, :on 981130,circuit Breaker SU-25 Tripped.Caused by Less than Adequate Procedural Guidance.Operators Verified Sys Integrity & Successfully Returned Sys to Svc.With1998-12-30030 December 1998
- on 981130,circuit Breaker SU-25 Tripped.Caused by Less than Adequate Procedural Guidance.Operators Verified Sys Integrity & Successfully Returned Sys to Svc.With
05000277/LER-1998-007-02, :on 981107,failure to Meet TS & Associated LCO Requirments of Absolute Difference in APRM & Calculated Power of Less than 2% Was Noted.Caused by Substitute Valves Being Used.Removed Substitute Valves.With1998-12-0404 December 1998
- on 981107,failure to Meet TS & Associated LCO Requirments of Absolute Difference in APRM & Calculated Power of Less than 2% Was Noted.Caused by Substitute Valves Being Used.Removed Substitute Valves.With
05000278/LER-1998-005-03, :on 981025,inadvertent Unit 3 Electrical Bus E33 Trip (Esfa) During Performance of Unit 2 Electrical Bus E32 Surveillance Test Was Noted.Caused by Personnel Error. Sp S12M-54-E32-XXF4 Was Completed.With1998-11-20020 November 1998
- on 981025,inadvertent Unit 3 Electrical Bus E33 Trip (Esfa) During Performance of Unit 2 Electrical Bus E32 Surveillance Test Was Noted.Caused by Personnel Error. Sp S12M-54-E32-XXF4 Was Completed.With
05000277/LER-1998-006-02, :on 980915,automatic RWCU Isolation Occurred While Placing RWCU Sys in Svc.Caused by Unexpected Surge of Water.Procedure Change Was Initiated to Open MO-2-12-74 & RWCU Sys Was Successfully Returned to Svc.With1998-10-0909 October 1998
- on 980915,automatic RWCU Isolation Occurred While Placing RWCU Sys in Svc.Caused by Unexpected Surge of Water.Procedure Change Was Initiated to Open MO-2-12-74 & RWCU Sys Was Successfully Returned to Svc.With
05000277/LER-1998-005-02, :on 980824,noted Failure to Meet TS Actions for Suppression chamber-to-drywell Vacuum Breaker Not Being Fully Seated.Caused by Personnel Failing to Take All TS Required Actions.Temporary Procedure Changes Were Made1998-09-18018 September 1998
- on 980824,noted Failure to Meet TS Actions for Suppression chamber-to-drywell Vacuum Breaker Not Being Fully Seated.Caused by Personnel Failing to Take All TS Required Actions.Temporary Procedure Changes Were Made
05000278/LER-1998-004-03, :on 980820,automatic RWCU Isolation Occurred While Placing B RWCU Sys Demineralizer in Svc.Caused by less-than-adequate Control of Equipment.Isolated B Demineralizer & Returned RWCU Sys to Svc1998-09-18018 September 1998
- on 980820,automatic RWCU Isolation Occurred While Placing B RWCU Sys Demineralizer in Svc.Caused by less-than-adequate Control of Equipment.Isolated B Demineralizer & Returned RWCU Sys to Svc
ML20237E6461998-08-0707 August 1998
- on 980505,loss of Both Trains of MCR Emergency Ventilation Sys Occurred.Caused by Flow Rate Not Being within Allowable Limits Per Ts.Monthly Surveillance Tests Have Been Revised.This LER Is Retraction of Original Rept
05000278/LER-1998-003-03, :on 980328,identified Failure to Meet TS for IST Stroke Timing of Msivs.Caused by Incorrect Interpretation of Required Testing Frequency.Reset Subject Surveillances to Appropriate TS Frequency1998-08-0707 August 1998
- on 980328,identified Failure to Meet TS for IST Stroke Timing of Msivs.Caused by Incorrect Interpretation of Required Testing Frequency.Reset Subject Surveillances to Appropriate TS Frequency
05000278/LER-1998-002-02, :on 980504,failure to Meet TS for Rcic,Was Revealed.Caused by Incomplete Procedural Guidance.Various Components Including Trip Tappet,Head Lever & Tappet Guide Were Replaced1998-07-22022 July 1998
- on 980504,failure to Meet TS for Rcic,Was Revealed.Caused by Incomplete Procedural Guidance.Various Components Including Trip Tappet,Head Lever & Tappet Guide Were Replaced
05000277/LER-1998-004-01, :on 980606,failure to Meet TS for off-site Source,Was Determined.Caused by Lightning Strike & No Positive Verification That Tap Changer Was operational.3SU Tap Changer Circuitry Was Repaired,Tested & Returned to Svc1998-07-22022 July 1998
- on 980606,failure to Meet TS for off-site Source,Was Determined.Caused by Lightning Strike & No Positive Verification That Tap Changer Was operational.3SU Tap Changer Circuitry Was Repaired,Tested & Returned to Svc
05000277/LER-1998-003-01, :on 980513,failure to Meet TS for Main Control Room Emergency Ventilation,Was Identified.Caused by Failure to Follow GP-25 Procedure Guidance.Main Control Room Emergency Ventilation Relays Inspected for Loose Screws1998-06-15015 June 1998
- on 980513,failure to Meet TS for Main Control Room Emergency Ventilation,Was Identified.Caused by Failure to Follow GP-25 Procedure Guidance.Main Control Room Emergency Ventilation Relays Inspected for Loose Screws
05000278/LER-1998-001-01, :on 971103,3A CS Pump Failed to Meet TS 3.5.1. Caused by Less than Adequate Focus on Foreign Matl Exclusion During 3R11 Suction Strainer replacement.3A CS Pump Was Disassembled,Matl Was Removed & Pump Was Reassembled1998-04-22022 April 1998
- on 971103,3A CS Pump Failed to Meet TS 3.5.1. Caused by Less than Adequate Focus on Foreign Matl Exclusion During 3R11 Suction Strainer replacement.3A CS Pump Was Disassembled,Matl Was Removed & Pump Was Reassembled
05000277/LER-1998-001-02, :on 960118,failure to Perform SR for First Recirculation Pump Start Was Noted.Caused by Inadequate Review of ITS Requirements.Revised Procedure to Include Appropriate SRs1998-04-22022 April 1998
- on 960118,failure to Perform SR for First Recirculation Pump Start Was Noted.Caused by Inadequate Review of ITS Requirements.Revised Procedure to Include Appropriate SRs
05000277/LER-1997-010-02, :on 971229,2A RFPT Failed to Trip When RO Pushed CR 2A RFPT Trip push-button.Caused by Intermittent Failure Mechanism.Repaired,Reinstalled & Tested Operability of 2A RFPT1998-01-28028 January 1998
- on 971229,2A RFPT Failed to Trip When RO Pushed CR 2A RFPT Trip push-button.Caused by Intermittent Failure Mechanism.Repaired,Reinstalled & Tested Operability of 2A RFPT
05000277/LER-1997-009-02, :on 971109,generator Lockout & Subsequent Turbine Trip Occurred.Caused by Turbine Trip Resulting from Generator Lockout Signal.Appropriate PCIS & RPS Scram Logics Were Reset1997-12-0909 December 1997
- on 971109,generator Lockout & Subsequent Turbine Trip Occurred.Caused by Turbine Trip Resulting from Generator Lockout Signal.Appropriate PCIS & RPS Scram Logics Were Reset
05000277/LER-1997-008-02, :on 740705,logic Sys Functional Testing Did Not Contain All Required Testing Per TS Surveillance Requirements.Caused by Test Procedures Not Containing Required Testing.Untested Contacts Tested & Proved Operable1997-11-26026 November 1997
- on 740705,logic Sys Functional Testing Did Not Contain All Required Testing Per TS Surveillance Requirements.Caused by Test Procedures Not Containing Required Testing.Untested Contacts Tested & Proved Operable
05000277/LER-1997-007-02, :on 970821,engineering Personnel Identified Potential Suppression Chamber Steam Bypass Leakage Path Between Air Spaces of Drywell & Torus.Caused by Original Design Deficiency.Drywell Purge Supply Valve Disabled1997-11-19019 November 1997
- on 970821,engineering Personnel Identified Potential Suppression Chamber Steam Bypass Leakage Path Between Air Spaces of Drywell & Torus.Caused by Original Design Deficiency.Drywell Purge Supply Valve Disabled
05000277/LER-1997-006-02, :on 970923,DG Auto Start During 4-kV Relay Testing Occurred.Caused by Personnel Error.Need for Exercising Caution When Removing or Installing Relay Cover Was Discussed W/I&C Technicians1997-10-21021 October 1997
- on 970923,DG Auto Start During 4-kV Relay Testing Occurred.Caused by Personnel Error.Need for Exercising Caution When Removing or Installing Relay Cover Was Discussed W/I&C Technicians
05000277/LER-1997-005-02, :on 970808,discovered TS non-compliance Associated W/Rod Block Contact Testing.Caused by Rev in Oct 1989,attempted to Consolidate Testing of Rod Block Logic from Two Instrument Panels.Procedure Revised1997-09-0808 September 1997
- on 970808,discovered TS non-compliance Associated W/Rod Block Contact Testing.Caused by Rev in Oct 1989,attempted to Consolidate Testing of Rod Block Logic from Two Instrument Panels.Procedure Revised
05000277/LER-1997-004-02, :on 970710,discovered non-compliance W/Ts When TS Action Times Were Exceeded.Caused by Procedural Control Not Being Adequate to Ensure Radiation Monitor Would Be Maintained in Trip Condition.Made Rev to GP-25 App 13 & 141997-07-31031 July 1997
- on 970710,discovered non-compliance W/Ts When TS Action Times Were Exceeded.Caused by Procedural Control Not Being Adequate to Ensure Radiation Monitor Would Be Maintained in Trip Condition.Made Rev to GP-25 App 13 & 14
05000277/LER-1997-003-03, :on 970601,HPCI Was Inoperable.Caused by Lifting of Common Power Wire Lug in HPCI Electrical Power Logic as Part of GP-25 Activity.Hpci Sys Was Restored to Operable Condition1997-06-27027 June 1997
- on 970601,HPCI Was Inoperable.Caused by Lifting of Common Power Wire Lug in HPCI Electrical Power Logic as Part of GP-25 Activity.Hpci Sys Was Restored to Operable Condition
05000278/LER-1997-003-01, :on 970404,TS Noncompliance Due to Loss of 3C RFP High Water Level Trip,Occurred.Caused by Failure to Correlate Turbine/Reset Light Problem to Inoperability. Operating Shift Procedures Revised1997-05-14014 May 1997
- on 970404,TS Noncompliance Due to Loss of 3C RFP High Water Level Trip,Occurred.Caused by Failure to Correlate Turbine/Reset Light Problem to Inoperability. Operating Shift Procedures Revised
05000277/LER-1997-002-03, :on 970326,TS Violation Identified as Result of Reactor Operation Slightly in Excess of Licensed Thermal Power.Ctp Calculation Program Was Modified to Compensate for Recirculation Pump Motor Power Factor1997-04-24024 April 1997
- on 970326,TS Violation Identified as Result of Reactor Operation Slightly in Excess of Licensed Thermal Power.Ctp Calculation Program Was Modified to Compensate for Recirculation Pump Motor Power Factor
05000277/LER-1997-001-03, :on 970318,TS Violation Due to non-conservative Average Power Range Monitor Flow Bias Scram Setpoints for Single Loop Operation.Procedural Enhancements to Ensure That Single Loop Flow Conditions,Accommodated1997-04-16016 April 1997
- on 970318,TS Violation Due to non-conservative Average Power Range Monitor Flow Bias Scram Setpoints for Single Loop Operation.Procedural Enhancements to Ensure That Single Loop Flow Conditions,Accommodated
05000278/LER-1997-002-02, :on 970309,manual Scram Occurred Due to Loss of Forced Reactor Core Circulation at Power as Result of 13kv Feeder Breaker Auxiliary Switch Failure.Auxiliary Switch Assembly Was Cleaned & Lubricated1997-04-0707 April 1997
- on 970309,manual Scram Occurred Due to Loss of Forced Reactor Core Circulation at Power as Result of 13kv Feeder Breaker Auxiliary Switch Failure.Auxiliary Switch Assembly Was Cleaned & Lubricated
05000277/LER-1996-009, :on 961001,declared High Pressure Coolant Injection (HPCI) Sys Inoperable Due to Bearing Misalignment. Realigned Bearing Housing,Performed ST-O-023-200-2 Satisfactorily & Declared HPCI Sys Operable1997-03-12012 March 1997
- on 961001,declared High Pressure Coolant Injection (HPCI) Sys Inoperable Due to Bearing Misalignment. Realigned Bearing Housing,Performed ST-O-023-200-2 Satisfactorily & Declared HPCI Sys Operable
05000278/LER-1997-001, :on 970122,determined Plant Thermal Power Exceeded 100% Due to Out of Tolerance Test Equipment.Retired Test Apparatus from Future Use & Will Review and Revise Procedures for Feedwater Temp Instruments1997-02-19019 February 1997
- on 970122,determined Plant Thermal Power Exceeded 100% Due to Out of Tolerance Test Equipment.Retired Test Apparatus from Future Use & Will Review and Revise Procedures for Feedwater Temp Instruments
05000277/LER-1996-011-01, :on 961030,main Steam Line Relief Valve Actuation Occurred Due to Inadvertent Movement of Control Switch.Reactor Operator Immediately Recognized Situation & Reclosed Valve.Event Discussed W/All Crews1996-12-0202 December 1996
- on 961030,main Steam Line Relief Valve Actuation Occurred Due to Inadvertent Movement of Control Switch.Reactor Operator Immediately Recognized Situation & Reclosed Valve.Event Discussed W/All Crews
05000277/LER-1996-010-01, :on 961006 & 1015,two Automatic Reactor Shutdown Occurred as Result of Main Generator Trip & Lockout Due to Actuation of Negative Sequence Current Protective Relay.Relay Replaced W/Relay of Newer Design1996-11-0505 November 1996
- on 961006 & 1015,two Automatic Reactor Shutdown Occurred as Result of Main Generator Trip & Lockout Due to Actuation of Negative Sequence Current Protective Relay.Relay Replaced W/Relay of Newer Design
05000277/LER-1996-009-02, :on 961001,HPCI Sys Declared Inoperable Due to Bearing Misalignment.Hpci Booster Pump Procedure Will Be Revised to Provide Appropriate Guidance for Bearing Alignment1996-10-31031 October 1996
- on 961001,HPCI Sys Declared Inoperable Due to Bearing Misalignment.Hpci Booster Pump Procedure Will Be Revised to Provide Appropriate Guidance for Bearing Alignment
05000278/LER-1996-002-03, :on 960624,room Cooler Associated w/3C LPCI Pump Discovered Inoperable.Caused by Inadequate Post Maint Testing.Room Cooler Fan Motor Wiring Corrected.Provided Staff W/Info Re Breaker Configuration Control1996-07-24024 July 1996
- on 960624,room Cooler Associated w/3C LPCI Pump Discovered Inoperable.Caused by Inadequate Post Maint Testing.Room Cooler Fan Motor Wiring Corrected.Provided Staff W/Info Re Breaker Configuration Control
05000277/LER-1996-007-01, :on 960604,ESFA Occurred Due to Loss of One off-site Electrical Source as Result of off-site Substation Activities.Reset Isolation Logics & Restored Affected Sys1996-07-0202 July 1996
- on 960604,ESFA Occurred Due to Loss of One off-site Electrical Source as Result of off-site Substation Activities.Reset Isolation Logics & Restored Affected Sys
05000278/LER-1996-001-03, :on 960529,HPCI Turbine Control Valve Failed to Open as Expected During Performance of Routine Test O-023A-450-3.Caused by Failed Solder Connection on HPCI Flow.Solder Connection Repaired1996-06-27027 June 1996
- on 960529,HPCI Turbine Control Valve Failed to Open as Expected During Performance of Routine Test O-023A-450-3.Caused by Failed Solder Connection on HPCI Flow.Solder Connection Repaired
05000277/LER-1996-006-01, :on 960522,Unit 2 RPS Power Supply Unexpectedly Lost.Caused by Human Performance.Rps Bus Supply Restored & Operator Involved in Event Coached on self-checking Practices.W/Undated Ltr1996-06-21021 June 1996
- on 960522,Unit 2 RPS Power Supply Unexpectedly Lost.Caused by Human Performance.Rps Bus Supply Restored & Operator Involved in Event Coached on self-checking Practices.W/Undated Ltr
05000277/LER-1995-006, :on 951022,offsite Electrical Power Source Lost.Caused by Momentary Deenergization of Several Electrical Distribution Panels.Isolation Logics Reset & Affected Sys Restored1996-06-17017 June 1996
- on 951022,offsite Electrical Power Source Lost.Caused by Momentary Deenergization of Several Electrical Distribution Panels.Isolation Logics Reset & Affected Sys Restored
05000277/LER-1996-005-01, :on 960508,determined Units 2 & 3 Operated in Condition Prohibited by TS 3.8.1.Caused by Result of Actuation of Load Tap Changer Surge Protection Circuitry. Alternate Source Replaced1996-06-0707 June 1996
- on 960508,determined Units 2 & 3 Operated in Condition Prohibited by TS 3.8.1.Caused by Result of Actuation of Load Tap Changer Surge Protection Circuitry. Alternate Source Replaced
05000277/LER-1996-004-01, :on 960417,HPCI Sys Declared Inoperable Due to Leak in Cooling Water Relief Valve.Caused by Igscc.Hpci Cooling Water Relief Valve Was Replaced.W/Undated Ltr1996-05-17017 May 1996
- on 960417,HPCI Sys Declared Inoperable Due to Leak in Cooling Water Relief Valve.Caused by Igscc.Hpci Cooling Water Relief Valve Was Replaced.W/Undated Ltr
05000277/LER-1996-003-01, :on 960228,ESFA Occurred Due to Loss of One off-site Power Source.Reset PCIS Group II Isolation Logics & Restored Affected Sys.W/Undated Ltr1996-03-28028 March 1996
- on 960228,ESFA Occurred Due to Loss of One off-site Power Source.Reset PCIS Group II Isolation Logics & Restored Affected Sys.W/Undated Ltr
05000277/LER-1996-002-01, :on 960126,TS Violation Occurred When Certain Emergency Bus Protection Relays Found Out of Calibr Due to Inadequate Testing Methodology.Recalibrated Affected Relays to within Appropriate TS Limits1996-02-23023 February 1996
- on 960126,TS Violation Occurred When Certain Emergency Bus Protection Relays Found Out of Calibr Due to Inadequate Testing Methodology.Recalibrated Affected Relays to within Appropriate TS Limits
05000277/LER-1996-001-01, :on 960118,licensed Thermal Power Slightly Exceeded Due to Unaccounted for CRD Water Flow.Caused by Failure to Consider Impact of Addl Flow on Core Thermal Power.Mod Design Process Will Be Enhanced.W/Undated Ltr1996-02-20020 February 1996
- on 960118,licensed Thermal Power Slightly Exceeded Due to Unaccounted for CRD Water Flow.Caused by Failure to Consider Impact of Addl Flow on Core Thermal Power.Mod Design Process Will Be Enhanced.W/Undated Ltr
05000278/LER-1995-007-02, :on 951202,main Turbine Trip Occurred Caused by Full Reactor Scram.Replaced Mechanical Trip Solenoid Valve Terminal Strip That Caused Initial Ground1995-12-26026 December 1995
- on 951202,main Turbine Trip Occurred Caused by Full Reactor Scram.Replaced Mechanical Trip Solenoid Valve Terminal Strip That Caused Initial Ground
05000278/LER-1995-005-03, :on 951108,three of Eleven MSRVs Did Not Lift within TS +1% Tolerance Due to Small Drift in Setpoint of Valves.Refurbished Valves Have Been Properly Setup at Test Facility & Install for All MSRVs & SVs1995-12-0808 December 1995
- on 951108,three of Eleven MSRVs Did Not Lift within TS +1% Tolerance Due to Small Drift in Setpoint of Valves.Refurbished Valves Have Been Properly Setup at Test Facility & Install for All MSRVs & SVs
05000278/LER-1995-004-03, :on 951028,drywell Floor Drain & Equipment Sump Pump Was in TS Violation.Caused by Both Floor & Equipment Drain Sump Pumps Not Operating in Automatic Mode.Provided Pertinent Info from Event to Personnel1995-11-27027 November 1995
- on 951028,drywell Floor Drain & Equipment Sump Pump Was in TS Violation.Caused by Both Floor & Equipment Drain Sump Pumps Not Operating in Automatic Mode.Provided Pertinent Info from Event to Personnel
