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Issue date | Title | Topic | |
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05000000/LER-1950-237, Updated LER 50-237/01L:on 760406,unacceptable Ultrasonic Indication Found on Isolation Condenser safe-end.Caused by Cracks in safe-ends.Cracked safe-end Removed & Sent to Bmcl for Metallographic Analysis | 13 July 1976 | Updated LER 50-237/01L:on 760406,unacceptable Ultrasonic Indication Found on Isolation Condenser safe-end.Caused by Cracks in safe-ends.Cracked safe-end Removed & Sent to Bmcl for Metallographic Analysis | |
05000000/LER-1977-005, Updated LER 77-005/1T:on 770114,failure of High Pressure Svc Water/Emergency Svc Water & Emergency Cooling Water Pumps to Meet FSAR Seismic Requirements Noted.Caused by Change in Calculation Techniques | 28 January 1977 | Updated LER 77-005/1T:on 770114,failure of High Pressure Svc Water/Emergency Svc Water & Emergency Cooling Water Pumps to Meet FSAR Seismic Requirements Noted.Caused by Change in Calculation Techniques | |
05000000/LER-1986-001, Partially Deleted LER 86-001-00:on 860105,loss of Dynamic Reporting of Vital Door Activity Occurred.Cause & Corrective Action Completely Deleted | 10 January 1986 | Partially Deleted LER 86-001-00:on 860105,loss of Dynamic Reporting of Vital Door Activity Occurred.Cause & Corrective Action Completely Deleted | |
05000000/LER-1986-002, Partially Deleted LER 86-002-00:on 860117,loss of Alarm Surveillance on Doors Occurred.Caused by Erroneously Listing Officer as Being Posted on Door 398.Processing of Rev to Physical Security Plan Initiated | 23 January 1986 | Partially Deleted LER 86-002-00:on 860117,loss of Alarm Surveillance on Doors Occurred.Caused by Erroneously Listing Officer as Being Posted on Door 398.Processing of Rev to Physical Security Plan Initiated | |
05000000/LER-1986-003, Partially Deleted LER 86-003-00:on 860125,loss of Dynamic Reporting of Vital Area Door Activity Occurred.Caused by Equipment Malfunction.Corrective Action Withheld | 29 January 1986 | Partially Deleted LER 86-003-00:on 860125,loss of Dynamic Reporting of Vital Area Door Activity Occurred.Caused by Equipment Malfunction.Corrective Action Withheld | |
05000000/LER-1986-004, Partially Deleted LER 86-004-01:on 860204,loss of Dynamic Reporting of Alarm Surveillance Occurred.Cause Withheld. Computer Svcs Personnel Will Continue to Monitor Sys for Indicators of Cause | 11 June 1986 | Partially Deleted LER 86-004-01:on 860204,loss of Dynamic Reporting of Alarm Surveillance Occurred.Cause Withheld. Computer Svcs Personnel Will Continue to Monitor Sys for Indicators of Cause | |
05000000/LER-1986-007, Partially Deleted LER 86-007-01:on 860218,loss of Alarm Surveillance Occurred.Caused by Water Leaking Into Cable Due to Heavy Rain.Cable Dried,Leak Repaired & Design Corrected | 6 October 1986 | Partially Deleted LER 86-007-01:on 860218,loss of Alarm Surveillance Occurred.Caused by Water Leaking Into Cable Due to Heavy Rain.Cable Dried,Leak Repaired & Design Corrected | |
05000000/LER-1986-009, Ro:On 860312,discovered That LER 2-86-04 & LER 86-009 Not Submitted to Nrc.Caused by Misplaced Repts.Repts Telecopied to Nrc.Procedure for Distribution of Repts Revised | 14 April 1986 | Ro:On 860312,discovered That LER 2-86-04 & LER 86-009 Not Submitted to Nrc.Caused by Misplaced Repts.Repts Telecopied to Nrc.Procedure for Distribution of Repts Revised | |
05000000/LER-1986-011, Partially Deleted LER 86-011-00:on 860410,vital Area Intrusion Alarm Failure Occurred.Cause of Event Deleted. Alarm & Door Tested Satisfactorily | 15 April 1986 | Partially Deleted LER 86-011-00:on 860410,vital Area Intrusion Alarm Failure Occurred.Cause of Event Deleted. Alarm & Door Tested Satisfactorily | |
05000000/LER-1986-012, Partially Deleted LER 86-012-00:on 860412,breach Discovered in Protected Area Barrier.Caused by Personnel Error. Personnel Counseled | 17 April 1986 | Partially Deleted LER 86-012-00:on 860412,breach Discovered in Protected Area Barrier.Caused by Personnel Error. Personnel Counseled | |
05000000/LER-1986-013, Partially Deleted LER 86-013-00:on 860414,vital Area Door W/O Alarm Capability Discovered.Caused by Personnel Error. Personnel Removed from Shift & Vital Area Checked for Unauthorized Personnel W/None Being Found | 18 April 1986 | Partially Deleted LER 86-013-00:on 860414,vital Area Door W/O Alarm Capability Discovered.Caused by Personnel Error. Personnel Removed from Shift & Vital Area Checked for Unauthorized Personnel W/None Being Found | |
05000000/LER-1986-014, Partially Deleted LER 86-014-00:on 860421,bomb Threat Received by Security Officer in Security Assembly Room. Cause Not Applicable.Actions Taken to Minimize Station Threat & Investigation Underway | 25 April 1986 | Partially Deleted LER 86-014-00:on 860421,bomb Threat Received by Security Officer in Security Assembly Room. Cause Not Applicable.Actions Taken to Minimize Station Threat & Investigation Underway | |
05000000/LER-1986-015, Partially Deleted LER 86-015-00:on 860428,stationary Side of Door Failed to Alarm When Tested.Cause Withheld.Alarm Repaired | 2 May 1986 | Partially Deleted LER 86-015-00:on 860428,stationary Side of Door Failed to Alarm When Tested.Cause Withheld.Alarm Repaired | |
05000000/LER-1986-016, Partially Deleted LER 86-016-00:on 860501,vital Area Door Discovered W/O Alarm Capabilities.Caused by Access Control Security Officer Asleep at Post.Determination to Suspend or Discontinue Employment Being Made | 6 May 1986 | Partially Deleted LER 86-016-00:on 860501,vital Area Door Discovered W/O Alarm Capabilities.Caused by Access Control Security Officer Asleep at Post.Determination to Suspend or Discontinue Employment Being Made | |
05000000/LER-1986-020, Partially Deleted LER 86-020-00:on 860812,security Sys Experienced Loss of Power.Caused Withheld.Numerous Failures Experienced Until Machine a Designated as Prime.Procedures to Reboot Computers Revised | 15 August 1986 | Partially Deleted LER 86-020-00:on 860812,security Sys Experienced Loss of Power.Caused Withheld.Numerous Failures Experienced Until Machine a Designated as Prime.Procedures to Reboot Computers Revised | |
05000000/LER-1986-021, Partially Deleted LER 86-021-00:on 860911,vital Area Doors Failed to Alarm When Tested During Surveillance.Caused by Failure to Report Door Transactions to Host Computer.Central Procesing Unit Board Replaced | 15 September 1986 | Partially Deleted LER 86-021-00:on 860911,vital Area Doors Failed to Alarm When Tested During Surveillance.Caused by Failure to Report Door Transactions to Host Computer.Central Procesing Unit Board Replaced | |
05000000/LER-1986-022, Partially Deleted LER 86-022-02:on 861018,potential Undetected Access Into Vital Area Discovered.Caused by Use of Incorrect Procedure.Card Reader Replaced & Tested to Ensure Proper Operation | 20 February 1987 | Partially Deleted LER 86-022-02:on 861018,potential Undetected Access Into Vital Area Discovered.Caused by Use of Incorrect Procedure.Card Reader Replaced & Tested to Ensure Proper Operation | |
05000000/LER-1986-023, Partially Deleted LER 86-023-01:on 861023,unauthorized Access Into Vital Area Door Discovered.Caused by Card Reader Malfunction.Malfunctioning Card Reader Replaced.Cause Still Under Investigation | 21 November 1986 | Partially Deleted LER 86-023-01:on 861023,unauthorized Access Into Vital Area Door Discovered.Caused by Card Reader Malfunction.Malfunctioning Card Reader Replaced.Cause Still Under Investigation | |
05000000/LER-1986-024, Partially Deleted LER 86-024-00:on 861113,attempted Introduction of Unauthorized Weapon Into Protected Area Discovered.Caused by Personnel Attempt to Enter Plant W/ Concealed Gun.Personnel Denied Facility Access | 18 November 1986 | Partially Deleted LER 86-024-00:on 861113,attempted Introduction of Unauthorized Weapon Into Protected Area Discovered.Caused by Personnel Attempt to Enter Plant W/ Concealed Gun.Personnel Denied Facility Access | |
05000000/LER-1986-026, Partially Deleted LER 86-026-00:on 861124,vital Area Door Discovered W/O Alarm Capability.Caused by Personnel Error. Secutiry Officer in Question Terminated & Function of Administrative Sergeant Reviewed | 1 December 1986 | Partially Deleted LER 86-026-00:on 861124,vital Area Door Discovered W/O Alarm Capability.Caused by Personnel Error. Secutiry Officer in Question Terminated & Function of Administrative Sergeant Reviewed | |
05000000/LER-1986-030, Partially Deleted LER 86-030-00:on 861211,unauthorized Opening Into Protected Area Discovered.Caused by Area Not Properly Identified as Area for Security Concern.Signs Posted | 16 December 1986 | Partially Deleted LER 86-030-00:on 861211,unauthorized Opening Into Protected Area Discovered.Caused by Area Not Properly Identified as Area for Security Concern.Signs Posted | |
05000000/LER-1986-052, Partially Withheld LER 86-052-01:on 860926,security Data Mgt Sys Computer Terminals Became Inoperable (Ref 10CFR73.21). Caused by Overload of Alarms & Sys Instability.Sys Restored by Placing Sys Multiplexers Online | 13 November 1986 | Partially Withheld LER 86-052-01:on 860926,security Data Mgt Sys Computer Terminals Became Inoperable (Ref 10CFR73.21). Caused by Overload of Alarms & Sys Instability.Sys Restored by Placing Sys Multiplexers Online | |
05000272/LER-1976-002, Supplemental LER 76-002/01T:on 760822,Conde Milking Machine Co Model MX-16A (Containment Air Sample Pump for Air Particulate & Gaseous Radiation Monitors R11A,R12A & R12B) Failed.Caused by Bearing or Shaft Seal Seizure | 7 October 1976 | Supplemental LER 76-002/01T:on 760822,Conde Milking Machine Co Model MX-16A (Containment Air Sample Pump for Air Particulate & Gaseous Radiation Monitors R11A,R12A & R12B) Failed.Caused by Bearing or Shaft Seal Seizure | |
05000272/LER-1976-004, Supplemental LER 76-004/03L:on 760902,during Transfer of 1A Vital Instrument Bus to Alternate Power source,1RH2 Closed,Resulting in Loss of RHR Flow to Rcs.Caused by tagged-open Supply Breakers | 28 January 1977 | Supplemental LER 76-004/03L:on 760902,during Transfer of 1A Vital Instrument Bus to Alternate Power source,1RH2 Closed,Resulting in Loss of RHR Flow to Rcs.Caused by tagged-open Supply Breakers | |
05000272/LER-1976-022, Updated LER 76-022/03L:on 761211,steam Generator 13 Level Transmitter LT-538 Failed.Cause Undetermined.Vendor Failed to Analyze Transmitter Before Repairs Made | 4 April 1978 | Updated LER 76-022/03L:on 761211,steam Generator 13 Level Transmitter LT-538 Failed.Cause Undetermined.Vendor Failed to Analyze Transmitter Before Repairs Made | |
05000272/LER-1976-030, Updated LER 76-030/03L:on 761228,during Sample Analysis of Boric Acid Storage Tanks 11 & 12,boron Concentration Noted Low.Cause Unknown.Chemical Analysis After Batching Confirmed Findings | 4 April 1978 | Updated LER 76-030/03L:on 761228,during Sample Analysis of Boric Acid Storage Tanks 11 & 12,boron Concentration Noted Low.Cause Unknown.Chemical Analysis After Batching Confirmed Findings | Boric Acid Shutdown Margin |
05000272/LER-1979-068, Supplemental LER 79-068/03X-1:on 791018,safety Injection Pump Motor 12 Tripped on Overcurrent.Caused by Impeller Locknuts Improperly Secured at Mfg Facility.Pumps Reassembled Using Locktite Compound | 24 February 1984 | Supplemental LER 79-068/03X-1:on 791018,safety Injection Pump Motor 12 Tripped on Overcurrent.Caused by Impeller Locknuts Improperly Secured at Mfg Facility.Pumps Reassembled Using Locktite Compound | Locktite |
05000272/LER-1981-059, Supplemental LER 81-059/01X-01:on 810616,during Initial Testing,Auxiliary Feedwater Pump 23 Turbine Steam Supply Check Valves 21MS46 & 23MS46 Found Damaged Internally.Caused by Steam Flow Sys Oscillations | 24 February 1984 | Supplemental LER 81-059/01X-01:on 810616,during Initial Testing,Auxiliary Feedwater Pump 23 Turbine Steam Supply Check Valves 21MS46 & 23MS46 Found Damaged Internally.Caused by Steam Flow Sys Oscillations | |
05000272/LER-1981-092 | 2 November 1981 | LER 81-092/01T-0:on 811020,during Routine Containment Insp, Operator Discovered Svc Water Leaking from Third from Top Secondary Coil on Containment Fan Coil Unit 15.Caused by Secondary Coil Failure.Leaking Coil Blank Flanged Off | |
05000272/LER-1981-121, Supplemental LER 81-121/03X-1:on 811228,svc Water Leak in Spool Piece Discovered Between Valves 12SW57 & 58.Design Change Package 1EC-0504 Implemented to Replace Piece W/Stainless Steel for Improved Corrosion Resistance | 30 March 1983 | Supplemental LER 81-121/03X-1:on 811228,svc Water Leak in Spool Piece Discovered Between Valves 12SW57 & 58.Design Change Package 1EC-0504 Implemented to Replace Piece W/Stainless Steel for Improved Corrosion Resistance | |
05000272/LER-1982-002, Supplemental LER 82-002/01X-2:on 820119,during Surveillance, Indications of Tube Thinning Detected by Eddy Current Exam. Tubes Above 30% Degradation Plugged.Tube R44C62 Sent to Westinghouse for Chemical & Metallurgical Testing | 29 December 1982 | Supplemental LER 82-002/01X-2:on 820119,during Surveillance, Indications of Tube Thinning Detected by Eddy Current Exam. Tubes Above 30% Degradation Plugged.Tube R44C62 Sent to Westinghouse for Chemical & Metallurgical Testing | |
05000272/LER-1982-003 | 26 May 1982 | LER 82-03L/031-0:on 820502,while Testing Valve 11SW122, Safeguards Equipment Control Cabinet Actuation Occurred. Caused by Locked Out Supply Breaker to Safety Injection Pump 11,due to Spurious Nature of Actuation | |
05000272/LER-1982-004, Supplemental LER 82-004/03X-1:on 820108,charging Pump 13 Declared Inoperable Due to Component Cooling Water Sys Being Tagged Out for Planned Maint.On 820109,positive Reactivity Change Found in RCS Boron Concentration | 20 October 1982 | Supplemental LER 82-004/03X-1:on 820108,charging Pump 13 Declared Inoperable Due to Component Cooling Water Sys Being Tagged Out for Planned Maint.On 820109,positive Reactivity Change Found in RCS Boron Concentration | |
05000272/LER-1982-008, Supplemental LER 82-008/03X-1:on 820126,boric Acid Concentrations in Boric Acid Storage Tanks 11 & 12 Found Below Tech Spec Limit.Caused by Dilution of Concentration by Flushing Water in Tank Following Maint.Boric Acid Added | 29 December 1982 | Supplemental LER 82-008/03X-1:on 820126,boric Acid Concentrations in Boric Acid Storage Tanks 11 & 12 Found Below Tech Spec Limit.Caused by Dilution of Concentration by Flushing Water in Tank Following Maint.Boric Acid Added | Boric Acid |
05000272/LER-1982-009, Supplemental LER 82-009/03X-1:on 820118 & 25,Cardox Fire Suppression Sys for 1A,1B & 1C Diesel Generator Areas & Fuel Oil Storage Area 12 Inoperable for More than 14 Days.Caused by Sys in Manual Mode Due to Maint Outage | 20 October 1982 | Supplemental LER 82-009/03X-1:on 820118 & 25,Cardox Fire Suppression Sys for 1A,1B & 1C Diesel Generator Areas & Fuel Oil Storage Area 12 Inoperable for More than 14 Days.Caused by Sys in Manual Mode Due to Maint Outage | Continuous fire watch |
05000272/LER-1982-014 | 31 March 1982 | LER 82-014/03L-0:on 820306,wind Speed Indications for 150 & 300-ft Elevations Failed.Local Indications Also Failed. Caused by iced-up Anemometers.Anemometers Thawed & Declared Operable | |
05000272/LER-1982-024, Supplemental LER 82-024/03X-1:on 820410,svc Water Flow to Containment Fan Coil Unit 12 Discovered to Be Less than Required 700 Gpm.Caused by Valve 12SW223 Being Stuck in Closed Position.Valve Exercised | 17 November 1983 | Supplemental LER 82-024/03X-1:on 820410,svc Water Flow to Containment Fan Coil Unit 12 Discovered to Be Less than Required 700 Gpm.Caused by Valve 12SW223 Being Stuck in Closed Position.Valve Exercised | |
05000272/LER-1982-028, Corrected LER 82-028/03L-0:on 820425,both Channels of Refueling Water Storage Tank (RWST) Level Indication Showed Less than Min Vol.Caused by Refilling Spent Fuel Pool. Makeup to RWST Initiated | 21 May 1982 | Corrected LER 82-028/03L-0:on 820425,both Channels of Refueling Water Storage Tank (RWST) Level Indication Showed Less than Min Vol.Caused by Refilling Spent Fuel Pool. Makeup to RWST Initiated | |
05000272/LER-1982-029, Supplemental LER 82-029/03X-1:on 820501,during Surveillance Testing,Svc Water Flow to Containment Fan Coil Unit 12 Discovered Less than Required 2,500 Gallons Per Minute for Low Speed.Caused by Stuck Flow Control Valve | 17 November 1983 | Supplemental LER 82-029/03X-1:on 820501,during Surveillance Testing,Svc Water Flow to Containment Fan Coil Unit 12 Discovered Less than Required 2,500 Gallons Per Minute for Low Speed.Caused by Stuck Flow Control Valve | |
05000272/LER-1982-035, Supplemental LER 82-035/99X-1:on 820526,fire Pump 2 Failed to Start.Caused by Damaged Fire Pump Electrical Sys Voltage Regulator/Alternator,Due to Faulty Wiring Harness.Damaged Components Replaced | 1 June 1983 | Supplemental LER 82-035/99X-1:on 820526,fire Pump 2 Failed to Start.Caused by Damaged Fire Pump Electrical Sys Voltage Regulator/Alternator,Due to Faulty Wiring Harness.Damaged Components Replaced | |
05000272/LER-1982-042, Supplemental LER 82-042/03X-1:on 820628,valves 12AF10 & 12AF86 Discovered Open.Caused by Personnel Negligence in Failure to Notice That Chains on Valves Improperly Installed.Valve Operation & Tagging Lesson Plans Revised | 20 October 1982 | Supplemental LER 82-042/03X-1:on 820628,valves 12AF10 & 12AF86 Discovered Open.Caused by Personnel Negligence in Failure to Notice That Chains on Valves Improperly Installed.Valve Operation & Tagging Lesson Plans Revised | |
05000272/LER-1982-081, Supplemental LER 82-081/01X-1:on 821104,16 1,000-kip Steam Generator Snubbers Found Out of Spec on Bleed Test & Six Snubbers Failed Acceleration Test.Caused by Flattened Piston Seal Rubber Matl Due to Aging.Seals Rebuilt | 3 March 1983 | Supplemental LER 82-081/01X-1:on 821104,16 1,000-kip Steam Generator Snubbers Found Out of Spec on Bleed Test & Six Snubbers Failed Acceleration Test.Caused by Flattened Piston Seal Rubber Matl Due to Aging.Seals Rebuilt | |
05000272/LER-1982-083, Supplemental LER 82-083/03X-1:on 821102,control Room Operator Observed Temp Recorder for Air temp-delta T Channels Not Printing.Caused by Failure of Pinion Gear on Chart Drive Motor.Motor Replaced | 1 June 1983 | Supplemental LER 82-083/03X-1:on 821102,control Room Operator Observed Temp Recorder for Air temp-delta T Channels Not Printing.Caused by Failure of Pinion Gear on Chart Drive Motor.Motor Replaced | |
05000272/LER-1982-090, Supplemental LER 82-090/01X-1:on 821121,video Insp of Removed Fuel Assemblies Revealed Cladding Ruptures on Element 13 in Fuel Assembly D-20.Caused by Isolated Instance of Secondary Hydriding | 29 June 1983 | Supplemental LER 82-090/01X-1:on 821121,video Insp of Removed Fuel Assemblies Revealed Cladding Ruptures on Element 13 in Fuel Assembly D-20.Caused by Isolated Instance of Secondary Hydriding | Fuel cladding |
05000272/LER-1982-091, Supplemental LER 82-091/01X-1:on 821130,operator Discovered Leakage from Weld of Svc Water Piping to Component Cooling HX 12.Caused by Extensive Biofouling & Corrosion of Circumferential Welds | 8 June 1983 | Supplemental LER 82-091/01X-1:on 821130,operator Discovered Leakage from Weld of Svc Water Piping to Component Cooling HX 12.Caused by Extensive Biofouling & Corrosion of Circumferential Welds | Hydrostatic Biofouling |
05000272/LER-1983-008, Supplemental LER 83-008/03X-1:on 830311,pressurizer Code Safety Valves 1PR3,1PR4 & 1PR5 Exceeded Lift Set Pressure Range & Had Heavy Seat Leakage.Partly Caused by Difference in Test Vs Actual Operating Conditions | 13 July 1983 | Supplemental LER 83-008/03X-1:on 830311,pressurizer Code Safety Valves 1PR3,1PR4 & 1PR5 Exceeded Lift Set Pressure Range & Had Heavy Seat Leakage.Partly Caused by Difference in Test Vs Actual Operating Conditions | Loop seal Power Operated Valves |
05000272/LER-1983-012, Telecopy Message of LER 83-012/01P-0:on 830222,both Reactor Trip Breakers Failed to Open.Cause Not Yet Determined. Investigation Underway | 28 February 1983 | Telecopy Message of LER 83-012/01P-0:on 830222,both Reactor Trip Breakers Failed to Open.Cause Not Yet Determined. Investigation Underway | |
05000272/LER-1983-023, Supplemental LER 83-023/01X-1:on 830602,notification Received from Westinghouse of Potential Unreviewed Safety Question Re Operation at Full Power Following Extended Reduced Power Operation.Procedures Implemented | 13 December 1983 | Supplemental LER 83-023/01X-1:on 830602,notification Received from Westinghouse of Potential Unreviewed Safety Question Re Operation at Full Power Following Extended Reduced Power Operation.Procedures Implemented | |
05000272/LER-1983-062, Supplemental LER 83-062/99X-1:on 831122,during Testing on Seismic Instrumentation,Triaxial Time History Accelograph Did Not Respond as Required.Caused by Detector Failure. Accelerometer Replaced | 24 February 1984 | Supplemental LER 83-062/99X-1:on 831122,during Testing on Seismic Instrumentation,Triaxial Time History Accelograph Did Not Respond as Required.Caused by Detector Failure. Accelerometer Replaced | |
05000311/LER-1981-036 | 6 July 1981 | LER 81-036/03L-0:on 810606,pressurizer Pressure Channel 1 Indicated Greater than Max Allowable Tolerance.Caused by Pressure Transmitter 2PT455 Out of Spec.Unit Calibr & Returned to Svc |