05000366/LER-1999-006, :on 990615,loss of Condenser Vacuum Leads to Manual Reactor Scram & ESF Actuation.Caused by Loss of Vacuum in Main Condenser.Operating Order Issued.With1999-07-14014 July 1999
- on 990615,loss of Condenser Vacuum Leads to Manual Reactor Scram & ESF Actuation.Caused by Loss of Vacuum in Main Condenser.Operating Order Issued.With
05000321/LER-1999-003-01, :on 990507,incorrect Performance of Equipment Clearance Led to Scram on High Reactor Pressure.Caused by Personnel Error.Personnel Disciplined & Improved Procedure.With1999-06-0101 June 1999
- on 990507,incorrect Performance of Equipment Clearance Led to Scram on High Reactor Pressure.Caused by Personnel Error.Personnel Disciplined & Improved Procedure.With
05000366/LER-1999-005, :on 990505,generator Ground Fault Caused Turbine Trip & Reactor Scram.Caused by Turning Vanes Which Broke Loose.Pieces of Broken Vanes & Rails Were Retrieved from Isophase Bus Duct.With1999-05-27027 May 1999
- on 990505,generator Ground Fault Caused Turbine Trip & Reactor Scram.Caused by Turning Vanes Which Broke Loose.Pieces of Broken Vanes & Rails Were Retrieved from Isophase Bus Duct.With
05000321/LER-1999-002-01, :on 990429,HPCI Sys Inoperability Occurred. Caused by Vacuum in HPCI Sys Vacuum Tank.Personnel Lowered Tank Vacuum & Successfully Completed HPCI Sys Testing.With1999-05-24024 May 1999
- on 990429,HPCI Sys Inoperability Occurred. Caused by Vacuum in HPCI Sys Vacuum Tank.Personnel Lowered Tank Vacuum & Successfully Completed HPCI Sys Testing.With
05000321/LER-1999-001-04, :on 990412,loss of Scram Valve Air Header Air Pressure & RPS Actuation Were Noted.Caused by Drawing Error. Revised Drawings to Show That Valve 1P52-F501 Provides Air to Scram Valve Air Header.With1999-05-10010 May 1999
- on 990412,loss of Scram Valve Air Header Air Pressure & RPS Actuation Were Noted.Caused by Drawing Error. Revised Drawings to Show That Valve 1P52-F501 Provides Air to Scram Valve Air Header.With
05000366/LER-1998-004-01, :on 981005,noted That full-in Position Indicating Light Did Not Extinguish as Expected When CR 38-15 Was Withdrawn.Caused by Personnel Error.Jumper Was Removed from RPIS Circuit Card for Rod 38-151999-01-0404 January 1999
- on 981005,noted That full-in Position Indicating Light Did Not Extinguish as Expected When CR 38-15 Was Withdrawn.Caused by Personnel Error.Jumper Was Removed from RPIS Circuit Card for Rod 38-15
05000366/LER-1998-005-04, :on 981117,missed TS Surveillance Was Noted. Caused by Administrative Error.Changed Manner in Which Surveillance Database Updates Are Initiated,Tracked & Implemented.With1998-12-15015 December 1998
- on 981117,missed TS Surveillance Was Noted. Caused by Administrative Error.Changed Manner in Which Surveillance Database Updates Are Initiated,Tracked & Implemented.With
05000366/LER-1998-004-04, :on 981005,condition Prohibited by TS Was Noted.Caused by Personnel Error.Coached Involved Personnel & Briefed Other Technicians on Event.With1998-10-29029 October 1998
- on 981005,condition Prohibited by TS Was Noted.Caused by Personnel Error.Coached Involved Personnel & Briefed Other Technicians on Event.With
05000366/LER-1998-003-05, :on 980923,RPS Actuation Occurred Due to Valve Position Error.Cause indeterminate.Re-pressurized Scram Air Header & Checked Valves in Pneumatic Lineup1998-10-14014 October 1998
- on 980923,RPS Actuation Occurred Due to Valve Position Error.Cause indeterminate.Re-pressurized Scram Air Header & Checked Valves in Pneumatic Lineup
05000321/LER-1998-002-03, :on 980406,unplanned Actuations of ESF Occurred.Caused by Blown Fuse.Blown Fuses Have Been Replaced1998-04-28028 April 1998
- on 980406,unplanned Actuations of ESF Occurred.Caused by Blown Fuse.Blown Fuses Have Been Replaced
05000366/LER-1998-002-02, :on 980318,assembly Error Led to Malfunctioning Governor Causing EDG Inoperability.Caused by Sticking Shutdown Solenoid on DG Governor.Established Periodic Replacement Schedule for Solenoid1998-04-15015 April 1998
- on 980318,assembly Error Led to Malfunctioning Governor Causing EDG Inoperability.Caused by Sticking Shutdown Solenoid on DG Governor.Established Periodic Replacement Schedule for Solenoid
05000321/LER-1998-001-03, :on 980216,MCREC Declared Inoperable Due to Discovery of Bypass Leakage Paths in Filter Trains.Cause Indeterminate.Installed Instruments in Filter Trains 1Z41-D004B & 1Z41-D004A1998-03-18018 March 1998
- on 980216,MCREC Declared Inoperable Due to Discovery of Bypass Leakage Paths in Filter Trains.Cause Indeterminate.Installed Instruments in Filter Trains 1Z41-D004B & 1Z41-D004A
05000366/LER-1998-001-01, :on 980127,high Pressure Coolant Injection Sys Inoperable During Maintenance Investigation Occurred.Caused by HPCI Sys Controller Being Placed in Manual Mode.Procedure Revised1998-02-26026 February 1998
- on 980127,high Pressure Coolant Injection Sys Inoperable During Maintenance Investigation Occurred.Caused by HPCI Sys Controller Being Placed in Manual Mode.Procedure Revised
05000321/LER-1997-007-03, :on 971118,pneumatic Leak Resulted in Closure of Pciv.Caused by N Leak from Pneumatic Manifold on MSIV 1B21-F022B.Repaired Leak & Confirmed That No Similar Leaks Exist on Any Other MSIVs1997-12-10010 December 1997
- on 971118,pneumatic Leak Resulted in Closure of Pciv.Caused by N Leak from Pneumatic Manifold on MSIV 1B21-F022B.Repaired Leak & Confirmed That No Similar Leaks Exist on Any Other MSIVs
05000366/LER-1997-010-02, :on 971120,manual Reactor Shutdown Resulted in Water Level Decrease & Group 2 & 5 PCIS Actuations.Caused by Component Failure.Discharge Check Valve 2N21-F019A Was Removed,Inspected & Rebuilt1997-12-0808 December 1997
- on 971120,manual Reactor Shutdown Resulted in Water Level Decrease & Group 2 & 5 PCIS Actuations.Caused by Component Failure.Discharge Check Valve 2N21-F019A Was Removed,Inspected & Rebuilt
05000321/LER-1997-008-03, :on 971118,Group 1 Isolation on Low Condenser Vacuum Occurred.Caused by Personnel Error & Less than Adequate Procedure.Counseled Involved Personnel & Revised Procedures 34AB-C71-001-1S & 34AB-C71-001-2S1997-12-0808 December 1997
- on 971118,Group 1 Isolation on Low Condenser Vacuum Occurred.Caused by Personnel Error & Less than Adequate Procedure.Counseled Involved Personnel & Revised Procedures 34AB-C71-001-1S & 34AB-C71-001-2S
05000321/LER-1997-006-03, :on 971031,apparent LPRM TIP Calibr Tube Failure Resulted in Primary Sys Pressure Boundary Leakage. Caused by Small Matl or Mfg Flaw in TIP Calibr Tube.Replaced Entire LPRM Assembly1997-11-26026 November 1997
- on 971031,apparent LPRM TIP Calibr Tube Failure Resulted in Primary Sys Pressure Boundary Leakage. Caused by Small Matl or Mfg Flaw in TIP Calibr Tube.Replaced Entire LPRM Assembly
05000321/LER-1997-005-03, :on 971014,control Rod Partially Withdrawn W/O Pressure in Scram Accumulator,Occurred.Caused by Personnel Error.Individuals Involved Counselled,Out of Svc HCUs Tagged Out & Inoperable HCUs Disabled1997-11-10010 November 1997
- on 971014,control Rod Partially Withdrawn W/O Pressure in Scram Accumulator,Occurred.Caused by Personnel Error.Individuals Involved Counselled,Out of Svc HCUs Tagged Out & Inoperable HCUs Disabled
05000366/LER-1997-009-01, :on 970911,discovered Normal & Standby Battery Charges for Both 2A & 2C DGs Were Disconnected.Caused by Personnel Error.Declared DGs Inoperable & Counseled Individual Involved1997-10-0707 October 1997
- on 970911,discovered Normal & Standby Battery Charges for Both 2A & 2C DGs Were Disconnected.Caused by Personnel Error.Declared DGs Inoperable & Counseled Individual Involved
05000366/LER-1997-008-01, :on 970818,main Journal Bearing Damage Rendered HPCI Sys Inoperable.Caused by Small Particles Contaminating Bearing Housing.Inspected & Replaced Inboard & Outboard Main Pump Bearings1997-09-10010 September 1997
- on 970818,main Journal Bearing Damage Rendered HPCI Sys Inoperable.Caused by Small Particles Contaminating Bearing Housing.Inspected & Replaced Inboard & Outboard Main Pump Bearings
05000321/LER-1997-004-03, :on 970715,single Failure Rendered RHRSW Long Term Containment Heat Removal Mode,Inoperable.Caused by Original Design Error.Temporary Mod 1-97-13 Was Implemented to Disarm Circuits1997-08-0606 August 1997
- on 970715,single Failure Rendered RHRSW Long Term Containment Heat Removal Mode,Inoperable.Caused by Original Design Error.Temporary Mod 1-97-13 Was Implemented to Disarm Circuits
05000366/LER-1997-007, :on 970422,main Turbine Tripped & Automatic Reactor Shutdown Due to Loss of Main Condenser Vacuum.Main Condenser Waterboxes Were Vented & Circulating Pump Inlet Screens Were Cleaned1997-05-0808 May 1997
- on 970422,main Turbine Tripped & Automatic Reactor Shutdown Due to Loss of Main Condenser Vacuum.Main Condenser Waterboxes Were Vented & Circulating Pump Inlet Screens Were Cleaned
05000366/LER-1997-006, :on 970407,TS Surveillance on Source Range Monitors Was Missed.Caused by Data Entry Error.Control Rod Exercises Suspended Until SRM Surveillance Was Successfully Perfomed1997-05-0707 May 1997
- on 970407,TS Surveillance on Source Range Monitors Was Missed.Caused by Data Entry Error.Control Rod Exercises Suspended Until SRM Surveillance Was Successfully Perfomed
05000366/LER-1997-004-02, :on 970331,inaccurate List of Primary Containment Isolation Valves Resulted in Missed Surveillance.Caused by Listing of PCIS Valve Position Indications.Performed Missed Surveillance1997-04-29029 April 1997
- on 970331,inaccurate List of Primary Containment Isolation Valves Resulted in Missed Surveillance.Caused by Listing of PCIS Valve Position Indications.Performed Missed Surveillance
05000366/LER-1997-005-01, :on 970402,unplanned Automatic Engineered Safety Feature Actuation Occurred Due to Personnel Error. Emergency Bus 2F Was Returned to Svc on 9704021997-04-25025 April 1997
- on 970402,unplanned Automatic Engineered Safety Feature Actuation Occurred Due to Personnel Error. Emergency Bus 2F Was Returned to Svc on 970402
05000366/LER-1997-002-02, :on 970325,grounded Jumper Caused Blown Fuse & Engineered Safety Features Actuations.Replaced Blown Fuse & Policies Contributing to Event Will Be Reviewed by 9706011997-04-22022 April 1997
- on 970325,grounded Jumper Caused Blown Fuse & Engineered Safety Features Actuations.Replaced Blown Fuse & Policies Contributing to Event Will Be Reviewed by 970601
05000366/LER-1997-003-02, :on 970328,excessive Leakage Identified on Secondary Bypass Valves Was Caused by Undersized Valve Operators & Inappropriate Valve & Operator Orientation. Re-routed Piping Containing Valves1997-04-22022 April 1997
- on 970328,excessive Leakage Identified on Secondary Bypass Valves Was Caused by Undersized Valve Operators & Inappropriate Valve & Operator Orientation. Re-routed Piping Containing Valves
05000321/LER-1997-003-01, :on 970325,RBM Operability Requirements Did Not Match Rod Withdrawal Error Analysis Assumptions Resulting in Disparity Between Core Analysis Design Procedure Assumptions & TS Requirements.Changes to TS Prepared1997-04-21021 April 1997
- on 970325,RBM Operability Requirements Did Not Match Rod Withdrawal Error Analysis Assumptions Resulting in Disparity Between Core Analysis Design Procedure Assumptions & TS Requirements.Changes to TS Prepared
05000321/LER-1997-002-01, :on 970207,determined TS Surveillance Requirement 3.8.1.9 Had Not Been Adequately Implemented. Caused by Less than Adequate Procedures in Logic Sys Functional Test.Operating Order Issued1997-03-0505 March 1997
- on 970207,determined TS Surveillance Requirement 3.8.1.9 Had Not Been Adequately Implemented. Caused by Less than Adequate Procedures in Logic Sys Functional Test.Operating Order Issued
05000366/LER-1997-001-02, :on 970125,HPCI Sys Inoperable Due to Unplanned Esfa.Caused by Less than Adequate Procedures.Hpci Sys Restored to Operable Status & Use of Affected Procedures Prohibited1997-02-24024 February 1997
- on 970125,HPCI Sys Inoperable Due to Unplanned Esfa.Caused by Less than Adequate Procedures.Hpci Sys Restored to Operable Status & Use of Affected Procedures Prohibited
05000321/LER-1997-001-01, :on 970129,pressure Boundary Leakage Results in Condition Prohibited by Tss.Cause of Event Cannot Be Determined Conclusively.Maint Personnel Repaired Line.W/1997-02-19019 February 1997
- on 970129,pressure Boundary Leakage Results in Condition Prohibited by Tss.Cause of Event Cannot Be Determined Conclusively.Maint Personnel Repaired Line.W/
05000366/LER-1996-004-03, :on 960917,misinterpretation of Requirements Resulted in Missed TSs Surveillance Occurred.Caused by Misinterpretation of Unit 2 TSs Surveillance.Procedure 57SV-011-2S Was Written & Approved1997-01-10010 January 1997
- on 960917,misinterpretation of Requirements Resulted in Missed TSs Surveillance Occurred.Caused by Misinterpretation of Unit 2 TSs Surveillance.Procedure 57SV-011-2S Was Written & Approved
05000321/LER-1996-015, :on 961119,automatic Primary Containment Isolation Sys Actuation Occurred.Caused by Failed Control Relay.Replaced Fuse 1A71B-F21 & Coil of Relay 1A71B-K56 & Evaluated Other Relays for Replacement1996-12-17017 December 1996
- on 961119,automatic Primary Containment Isolation Sys Actuation Occurred.Caused by Failed Control Relay.Replaced Fuse 1A71B-F21 & Coil of Relay 1A71B-K56 & Evaluated Other Relays for Replacement
05000321/LER-1996-014, :on 961106,incorrect Circuit Breaker Setting Resulted in Inoperable Edg.Caused by Failure to Incorporate Design Info Into Appropriate Plant Single Line Electrical Drawing.Temporary Plant Mod Will Be Installed1996-12-0202 December 1996
- on 961106,incorrect Circuit Breaker Setting Resulted in Inoperable Edg.Caused by Failure to Incorporate Design Info Into Appropriate Plant Single Line Electrical Drawing.Temporary Plant Mod Will Be Installed
05000321/LER-1996-013, :on 961022,personnel Error Resulted in Missed TS Surveillances.Personnel Made Aware of Error & Consequences1996-11-12012 November 1996
- on 961022,personnel Error Resulted in Missed TS Surveillances.Personnel Made Aware of Error & Consequences
05000321/LER-1996-012, :on 961008,ground on 600-volt Bus Causes Loss of RPS Power Supply & Unplanned ESF Sys Actuations.Caused by nonfault-tolerant Design.Cable & Heater Replaced & Use of Breaker Trip Devices Investigated1996-10-30030 October 1996
- on 961008,ground on 600-volt Bus Causes Loss of RPS Power Supply & Unplanned ESF Sys Actuations.Caused by nonfault-tolerant Design.Cable & Heater Replaced & Use of Breaker Trip Devices Investigated
05000366/LER-1996-003-05, :on 960813,HPCI Sys Temporarily Inoperable Following ESF Actuation,Due to Physical Slip of Technician That Occurred When Technician Was Manipulating Piece of Test.Valve re-opened1996-08-30030 August 1996
- on 960813,HPCI Sys Temporarily Inoperable Following ESF Actuation,Due to Physical Slip of Technician That Occurred When Technician Was Manipulating Piece of Test.Valve re-opened
05000321/LER-1996-011, :on 960719,periodic Valve Position Check Required by Unit TS SR Had Not Been Performed.Caused by Inadequate Procedures.Procedures Revised to Include Periodic Position Check1996-08-16016 August 1996
- on 960719,periodic Valve Position Check Required by Unit TS SR Had Not Been Performed.Caused by Inadequate Procedures.Procedures Revised to Include Periodic Position Check
05000321/LER-1996-010, :on 960629,failure of Turbine Overspeed Control Valve Occurred.Caused by Failed Hydraulic Actuator Diaphragm.Replaced Failed Diaphragm & HPCI Control Valve Diaphragm1996-07-24024 July 1996
- on 960629,failure of Turbine Overspeed Control Valve Occurred.Caused by Failed Hydraulic Actuator Diaphragm.Replaced Failed Diaphragm & HPCI Control Valve Diaphragm
05000366/LER-1996-002-03, :on 960626,HPCI Sys Turbine Stop Valve Failed to Open.Caused by Failed Oil Pump Discharge Filter.Flushed Mechanical Trip Piston,Drained,Cleaned and Added New Oil to Reservior & Changed Oil Pump Discharge Filters1996-07-24024 July 1996
- on 960626,HPCI Sys Turbine Stop Valve Failed to Open.Caused by Failed Oil Pump Discharge Filter.Flushed Mechanical Trip Piston,Drained,Cleaned and Added New Oil to Reservior & Changed Oil Pump Discharge Filters
05000321/LER-1996-009, :on 960526,reactor Feed Pumps Automatically Tripped.Caused by Component Failure.Failed Circuit Board Replaced1996-06-19019 June 1996
- on 960526,reactor Feed Pumps Automatically Tripped.Caused by Component Failure.Failed Circuit Board Replaced
05000366/LER-1996-001-03, :on 960508,safety Limit Min Critical Power Ratio for Unit 2 Cycle 13 Found Not Conservative.Caused by GE Methodology Used to Calculate Generic SLMCPR Did Not Yield Conservative Value.Olmcpr Increased1996-06-0707 June 1996
- on 960508,safety Limit Min Critical Power Ratio for Unit 2 Cycle 13 Found Not Conservative.Caused by GE Methodology Used to Calculate Generic SLMCPR Did Not Yield Conservative Value.Olmcpr Increased
05000321/LER-1996-008, :on 960430,reactor Pressure Increase Resulted in Automatic Reactor Shutdown.Caused by Inadequate Procedure.Procedures Revised1996-05-29029 May 1996
- on 960430,reactor Pressure Increase Resulted in Automatic Reactor Shutdown.Caused by Inadequate Procedure.Procedures Revised
05000321/LER-1996-007, :on 960424,failed Component Results in Inadvertent EDG Start.Caused by Relay Momentarily Binding in Actuated Position.Relay Replaced & Surveillance Completed1996-05-24024 May 1996
- on 960424,failed Component Results in Inadvertent EDG Start.Caused by Relay Momentarily Binding in Actuated Position.Relay Replaced & Surveillance Completed
05000321/LER-1996-006, :on 960421,withdrawal of Inoperable Control Rod Occurred.Caused by Inadequate Procedure & Lack of Work Coordination.Procedure 3460-OPS-066-05 Revised & TSs Associated W/Event Explained1996-05-21021 May 1996
- on 960421,withdrawal of Inoperable Control Rod Occurred.Caused by Inadequate Procedure & Lack of Work Coordination.Procedure 3460-OPS-066-05 Revised & TSs Associated W/Event Explained
05000321/LER-1996-005, :on 960414,supply Breaker for 4160V/600V Station Svc Transformer 1D Opened de-energizing 600V Bus 1R23-S004.Caused by Personnel Error.Personnel Involved Counseled1996-05-10010 May 1996
- on 960414,supply Breaker for 4160V/600V Station Svc Transformer 1D Opened de-energizing 600V Bus 1R23-S004.Caused by Personnel Error.Personnel Involved Counseled
05000321/LER-1996-004, :on 960323,reactor Pressure Increased & Reactor Automatically Shut Down.Caused by Inadequate Sys Operating Procedure 34SO-N30-001-1S, Main Turbine Operation. Procedures 34SO-N30-001-1S & -2S Revised1996-04-22022 April 1996
- on 960323,reactor Pressure Increased & Reactor Automatically Shut Down.Caused by Inadequate Sys Operating Procedure 34SO-N30-001-1S, Main Turbine Operation. Procedures 34SO-N30-001-1S & -2S Revised
05000321/LER-1996-003, :on 960309,PCIS Valves Closed Unexpectedly & Isolated Reactor Coolant Leakage Detection Sys.Caused by Component Failure.Logic Power Fuse & Relay Coil Replaced & Group 2 Isolation Signal Reset1996-04-0808 April 1996
- on 960309,PCIS Valves Closed Unexpectedly & Isolated Reactor Coolant Leakage Detection Sys.Caused by Component Failure.Logic Power Fuse & Relay Coil Replaced & Group 2 Isolation Signal Reset
05000321/LER-1996-002, :on 960223,secondary Containment Doors & Hatches Missed TS Surveillance.Caused by Personnel Error. C/A:Individual Placed on Gpc Positive Discipline Program1996-03-22022 March 1996
- on 960223,secondary Containment Doors & Hatches Missed TS Surveillance.Caused by Personnel Error. C/A:Individual Placed on Gpc Positive Discipline Program
05000321/LER-1996-001, :on 960104,clogged Servovalve Strainers Resulted in Turbine Control Valve Closure & Automatic Reactor Shutdown.All Servovalves Strainers Replaced1996-01-26026 January 1996
- on 960104,clogged Servovalve Strainers Resulted in Turbine Control Valve Closure & Automatic Reactor Shutdown.All Servovalves Strainers Replaced
