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 Issue dateTitleTopic
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 Analysis13 July 1976Updated 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 Techniques28 January 1977Updated 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 Deleted10 January 1986Partially 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 Initiated23 January 1986Partially 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 Withheld29 January 1986Partially 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 Cause11 June 1986Partially 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 Corrected6 October 1986Partially 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 Revised14 April 1986Ro: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 Satisfactorily15 April 1986Partially 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 Counseled17 April 1986Partially 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 Found18 April 1986Partially 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 Underway25 April 1986Partially 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 Repaired2 May 1986Partially 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 Made6 May 1986Partially 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 Revised15 August 1986Partially 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 Replaced15 September 1986Partially 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 Operation20 February 1987Partially 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 Investigation21 November 1986Partially 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 Access18 November 1986Partially 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 Reviewed1 December 1986Partially 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 Posted16 December 1986Partially 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 Online13 November 1986Partially 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
05000266/LER-1982-009, Telecopy Message of LER 82-009/01T-0:on 821030,tubes in Steam Generators a & B Found W/More than 40% Degradation.On 821025,insp Revealed 5 Wet or Dripping Explosive Plugs.No Cause Stated.Tubes Plugged1 November 1982Telecopy Message of LER 82-009/01T-0:on 821030,tubes in Steam Generators a & B Found W/More than 40% Degradation.On 821025,insp Revealed 5 Wet or Dripping Explosive Plugs.No Cause Stated.Tubes Plugged
05000266/LER-1985-002, Forwards LER 85-002-01 Re Details of Fuel Damage Found on Fuel Assembly H14,which Spent Last Cycle in Core Position D12.Rept Suppls Original Rept19 May 1986Forwards LER 85-002-01 Re Details of Fuel Damage Found on Fuel Assembly H14,which Spent Last Cycle in Core Position D12.Rept Suppls Original ReptFuel cladding
05000266/LER-1990-00618 July 1990LER 90-006-00:on 900619,nuclear Instrumentation Turbine Runback Occurred.Caused by Spurious Signal Believed to Have Been Negative Spike.Voltage Spike Considered Spurious. W/900718 Ltr
05000266/LER-1992-004, Corrected LER 92-004-00:on 920515,determined That One Svc Water Pump & One Containment Ventilation Fan Sequenced Onto EDG More Times than Listed in Fsar,Section 8.2.3.Caused by Time Delay Relay Out of Tolerence.Evaluation Under9 July 1992Corrected LER 92-004-00:on 920515,determined That One Svc Water Pump & One Containment Ventilation Fan Sequenced Onto EDG More Times than Listed in Fsar,Section 8.2.3.Caused by Time Delay Relay Out of Tolerence.Evaluation Underway
05000266/LER-1993-001, Revised LER 93-001-00:on 930107,all 4,160 Volt Degraded Grid Voltage Protection Channels Declared Inoperable Due to Discovery That Settings for Relays on Subj Channels Being Too Low.Plant Mods Will Be Made16 February 1993Revised LER 93-001-00:on 930107,all 4,160 Volt Degraded Grid Voltage Protection Channels Declared Inoperable Due to Discovery That Settings for Relays on Subj Channels Being Too Low.Plant Mods Will Be Made
05000266/LER-1993-00725 August 1993LER 93-007-00:on 930726,EDG Inadvertently Started and Station Battery Tripped Off Due to Undervoltage Signal. Caused by Blown Fuse as Result of Human Error During Calibr of 1A-06 Voltmeter.Fuse replaced.W/930825 Ltr
05000277/LER-1976-011, Telecopy LER 76-011/01P:on 760219,allowable Gross Activity Gaseous Release Rate Exceeded Tech Spec.Caused by Xenon Gases Released During Filter Demineralizer Backwash.No Immediate Corrective Action Possible19 February 1976Telecopy LER 76-011/01P:on 760219,allowable Gross Activity Gaseous Release Rate Exceeded Tech Spec.Caused by Xenon Gases Released During Filter Demineralizer Backwash.No Immediate Corrective Action Possible
05000277/LER-1976-012, Telecopy LER 76-012/01P:on 760225,allowable Gross Activity Gaseous Release Rate Exceeded Tech Spec.Caused by Xenon Gases Released During Filter Demineralizer Backwash.No Immediate Corrective Action Possible25 February 1976Telecopy LER 76-012/01P:on 760225,allowable Gross Activity Gaseous Release Rate Exceeded Tech Spec.Caused by Xenon Gases Released During Filter Demineralizer Backwash.No Immediate Corrective Action Possible
05000277/LER-1976-015, Telecopy LER 76-015/01P:allowable Gross Activity Gaseous Release Rate Exceeded Tech Spec.Caused by Xenon Gases Released During Filter Demineralizer Backwash.No Immediate Corrective Action Possible5 March 1976Telecopy LER 76-015/01P:allowable Gross Activity Gaseous Release Rate Exceeded Tech Spec.Caused by Xenon Gases Released During Filter Demineralizer Backwash.No Immediate Corrective Action Possible
05000277/LER-1982-00612 April 1982LER 82-006/03L-0:on 820313,during Surveillance Testing of Fire Protection Sys,Diesel Fire Pump Tripped Off on Overspeed Condition.Caused by Defective Overspeed Control Switch.Defective Switch Replaced
05000277/LER-1982-008, Revised LER 82-008/01X-1:on 820328,auxiliary Boiler Operated on Diesel Fuel 2 Instead of Fuel Oil 6,decreasing Diesel Fuel Inventory Below Tech Spec Limit of 104,000 Gallons. Caused by Failure to Monitor Fuel Tank Inventory15 April 1982Revised LER 82-008/01X-1:on 820328,auxiliary Boiler Operated on Diesel Fuel 2 Instead of Fuel Oil 6,decreasing Diesel Fuel Inventory Below Tech Spec Limit of 104,000 Gallons. Caused by Failure to Monitor Fuel Tank Inventory
05000277/LER-1982-010, Sanitized Version of LER 82-010/01X-0:on 820413,Eberline Instrument Corp Reported 9.175 Rem Exposure to TLD Badge. Caused by Deliberate Tampering W/Badge Found Near Radiation Source.Individual Denied Access to Site13 May 1982Sanitized Version of LER 82-010/01X-0:on 820413,Eberline Instrument Corp Reported 9.175 Rem Exposure to TLD Badge. Caused by Deliberate Tampering W/Badge Found Near Radiation Source.Individual Denied Access to Site
05000277/LER-1982-01211 June 1982LER 82-012/03L-0:on 820517,pressure Drop Across Combined HEPA Filters & Charcoal Absorber Banks in Control Room Emergency Ventilation Sys Exceeded Tech Spec Limits.Caused by Pin on Connecting Linkage of Damper OBV-30 Falling Out
05000277/LER-1982-0138 July 1982LER 82-013/03L-0:on 820608,while Filling Diesel Generator Carbon Dioxide Fire Suppression Sys Storage Tank,Tank Pressure Dropped Below Tech Spec Limit.Caused by Venting Tank Vapor Space to Atmosphere Instead of Delivery TruckFire Watch
05000277/LER-1982-0156 July 1982LER 82-015/1P:on 820703,main Steam Line Flow Transmitter D & 1 of 4 Main Steam Line High Flow Transmitters Found W/Open Equalizing Valves.Cause Under Investigation.Valving of Instruments Verified
05000277/LER-1982-01613 July 1982LER 82-016/01P:on 820709,equalizing Valve on Main Steam Line a High Flow Transmitter (Dpis 116B) Found Open.Cause Under Investigation.Valving of Instrument Performance Verified
05000277/LER-1982-030, Telecopy Message of LER 82-030/01P:on 820917,contaminated Water Released from Recombiner Bldg Into Storm Drain Sys. Caused by Spurious Actuation of Fire Protection Sprinkler Sys in B Filter Train of Exhaust Ventilation Sys21 September 1982Telecopy Message of LER 82-030/01P:on 820917,contaminated Water Released from Recombiner Bldg Into Storm Drain Sys. Caused by Spurious Actuation of Fire Protection Sprinkler Sys in B Filter Train of Exhaust Ventilation Sys
05000277/LER-1984-003, Revised LER 84-003-01:on 840131,heatup Rate Exceeded Tech Spec Limits.Caused by Personnel Error.Operator Disciplined. Memo Issued to All Licensed Operators Re Tech Spec Rate3 May 1984Revised LER 84-003-01:on 840131,heatup Rate Exceeded Tech Spec Limits.Caused by Personnel Error.Operator Disciplined. Memo Issued to All Licensed Operators Re Tech Spec Rate
05000277/LER-1984-008, Revised LER 84-008-01:on 840427,standby Gas Treatment Sys Solenoid Valve SV-00009 Failed to Operate Properly, Preventing Fan a Inlet & Outlet Dampers from Opening.Cause of Solenoid Failure Under Investigation24 July 1984Revised LER 84-008-01:on 840427,standby Gas Treatment Sys Solenoid Valve SV-00009 Failed to Operate Properly, Preventing Fan a Inlet & Outlet Dampers from Opening.Cause of Solenoid Failure Under Investigation
05000277/LER-1987-016, Corrected LER 87-016-00:on 870820,isolations Occurred When Four of Eight 4 Kv Emergency Transformers Momentarily de-energized.Caused by Inadequate Concern for Potential Electrical Hazard by Maint Craft Supervision28 September 1987Corrected LER 87-016-00:on 870820,isolations Occurred When Four of Eight 4 Kv Emergency Transformers Momentarily de-energized.Caused by Inadequate Concern for Potential Electrical Hazard by Maint Craft Supervision
05000277/LER-1989-006, Corrected LER 89-006-00:on 890209 & 25,determined That Tubing to Containment Isolation Valve Installed W/Inadequate Support & Containment Atmosphere Control & Dilution Sys Not Per Applicable Installation Criteria.Controls Estab9 May 1989Corrected LER 89-006-00:on 890209 & 25,determined That Tubing to Containment Isolation Valve Installed W/Inadequate Support & Containment Atmosphere Control & Dilution Sys Not Per Applicable Installation Criteria.Controls Established
05000277/LER-1989-007, Corrected LER 89-007-00:on 890411,green Discoloration Discovered in Grease on Stabs of Control Fuses in Switchgear.Root Cause of Event Under Investigation.Stabs Lubricated W/Different Type of Approved Grease9 May 1989Corrected LER 89-007-00:on 890411,green Discoloration Discovered in Grease on Stabs of Control Fuses in Switchgear.Root Cause of Event Under Investigation.Stabs Lubricated W/Different Type of Approved GreaseTime of Discovery
05000277/LER-1990-01327 June 1990LER 90-013-00:on 900530,failure to Perform Tech Spec Surveillance Tests Since 891130 Discovered.Caused by Incorrect Std Practice.Tests Revised to Clarify Testing Requirements of Tech Spec 4.14.C.1.c.W/900627 LtrTime of Discovery
05000277/LER-1990-01419 July 1990LER 90-014-00:on 900620,RWCU Isolation Occurred During Pressurization of Sys Following Isolation Valve Maint.Caused by Design Weakness.Design of Instrumentation Reviewed & Procedural Controls enhanced.W/900719 LtrPacking leak
05000278/LER-1982-00514 June 1982LER 82-005/03L-0:on 820514,during Normal Operation,Reactor Operator Heard Relay in Primary Containment Isolation Sys Energize.Caused by Defective Component in Rosemount Model 510DU Slave Trip Unit.Instrument Replaced
05000278/LER-1982-00721 June 1982LER 82-007/03L-0:on 820519,during Operability Testing,Hpci Steam Inlet valve,MO-14,blew Fuses When Stroked & Turbine Stop valve,HO-5513,failed to Close in Response to Remote Trip Signal.Steam Inlet Valve Repacked & Switch Replaced
05000278/LER-1982-00928 June 1982LER 82-009/03L-0:on 820530,operator Lost Valve Indication Position on HPCI Sys.Caused by Blown Fuse in Instrument Panel Due to Shortened Solenoid Coil in Turbine Exhaust Drain Valve.Fuse Replaced & Valves Stroked
05000278/LER-1982-01013 July 1982LER 82-010/03L-0:on 820618,downscale Failure of Drywell 0-70 Psig Pressure Recorder Occurred.Caused by Blown 0.3 Ampere Fuse Installed on Positive Side of Power Supply to Transmitter Circuit Board.Fuse Replaced