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| Issue date | Title | Topic | |
|---|---|---|---|
| ML20046C129 | 2 August 1993 | LER 93-007-00:on 930701,determined That Unit 1 Ssf Rc Makeup Sys Inoperable in Past Due to Design Deficiency.Operations Procedures Revised to Reflect Newly Calculated Operating Limits for Rc Makeup Pump,Rcps & RCS.W/930802 Ltr | |
| ML20024B988 | 30 June 1983 | LER 83-008/03L-0:on 830531,motor Driven Emergency Feedwater Pump Became Inoperable When Power Removed from Circuitry for Repair of Automatic Initiation Switch 2PS-388.Caused by Component Failure.Switch Replaced & recalibr.W/830630 Ltr | |
| ML20024C423 | 24 June 1983 | LER 83-011/03L-0:on 830525,lockout Indication Received for Startup Transformer CT3.Cause unknown.CT3 Energized. W/830624 Ltr | |
| ML20023C711 | 5 May 1983 | Updated LER 83-012/01T-1:on 830421,emergency Discharge Valve to Keowee Tailrace CCW-8 Opened W/O Command,Rendering Condenser Circulating Water Emergency Discharge Sys Inoperable.Caused by Component Failure | |
| ML20023C446 | 22 April 1983 | LER 83-012/01T-0:on 830408,emergency Discharge Valve to Keowee Tailrace CCW-8 Opened W/O Command,Rendering Condenser Circulating Water Emergency Discharge Sys Inoperable.Caused by Shorted Conductor.Conductor Replaced | |
| ML20028E099 | 13 January 1983 | LER 82-020/03L-0:on 821214,both Unit 1 Turbine Driven & 1A Motor Driven Emergency Feedwater Pumps Incapable of Automatic Actuation for 60 S.Caused by Defective Procedures. Personnel Counseled & Procedures Rewritten | |
| ML20028D177 | 6 January 1983 | LER 82-019/03L-0:on 821207,valve 1HP-25 Failed to Open Remotely During Operational Valve Function Test.Caused by Component Failure.Valve Manually Cracked Open,Cycled & Stroke Tested | |
| ML20027D854 | 3 November 1982 | LER 82-011/03L-0:on 821004,while Inspecting Snubber Installed on 821002,mechanic Found Snubber Inoperable.Caused by Misreading of Hanger Sketch.Snubber Removed,Tested & Reinstalled | |
| ML20027D633 | 28 October 1982 | LER 82-018/01T-0:on 821014,three of Six Installed Safety Valves Determined to Have Degraded Performance Based on Valve Ring Settings.Cause of Difference in Ring Settings Unknown.Valves Reset Using EPRI Tested Settings | |
| ML20027B839 | 21 September 1982 | LER 82-011/03L-0:on 820822,erratic Indication Observed on Channel a Borated Water Storage Tank Level Instrumentation. Caused by Boiling Water in Level Transmitter Line.Heat Tracing Disconnected & Transmitter Lines Refilled | |
| ML20027B462 | 10 September 1982 | LER 82-009/01T-0:on 820804,during Refueling Insp of Reactor Coolant Pump,Five Closure Studs Found Degraded in Size Below Tech Spec Min.Caused by Boric Acid Corrosion Due to Closure Gasket Leakage.Studs Replaced | Boric Acid |
| ML20052H695 | 12 May 1982 | LER 82-007/01T-0:on 820428,during Final Reactor Bldg Insp, One Vertical Tendon in Secondary Shield Wall Was Found Broken.Caused by Stress Corrosion of post-tensioning Wires Near Stressing Washers Due to Water | |
| ML20052G510 | 7 May 1982 | LER 82-010/03L-0:on 820407,reactor Bldg Isolation Valve 1LWD-1 Failed to Close After Pumping Reactor Bldg Normal Sump.Apparently Caused by Dirty Contact in Valve Operating Motor Starting Compartment.Contact Cleaned | |
| ML20052A411 | 16 April 1982 | LER 82-006/01T-0:on 820402,spent Fuel Assembly Moved from Spent Fuel Pool Racks to Sipping Can While Spent Fuel Pit Ventilation Sys Out of Svc.Caused by Personnel Error.Fuel Handling Suspended | |
| ML20052A237 | 16 April 1982 | LER 82-006/01T-0:on 820306,steam Generator Tube Leak of Approx 0.08 Gpm Indicated by Condensate Steam Air Ejector Offgas Radiation Monitor.Caused by Crack in Tube 78-2.Unit Shut Down,Leaking Tube Stabilized & Plugged | Eddy Current Testing |
| ML20052A402 | 13 April 1982 | LER 82-004/01T:on 820302,testing of HPI Nozzle Areas Revealed Loose 2A2 Thermal Sleeves & Cracks in Id of Safe End & Piping.Caused by Thermal Fatigue.Cracked Piping,Safe End & Thermal Sleeves Replaced | Thermal fatigue |
| ML20052A412 | 13 April 1982 | LER 82-005/01T-0:on 820330,spent Fuel Pool Fans Found to Have Been Inoperable During 820323-29 Move of 10 Fuel Assemblies.Caused by Personnel Error in That White Tags for Fans Not Placed or Removed During Leak Rate Test Procedure | |
| ML20052A320 | 9 April 1982 | LER 82-004/01T-0:on 820226,nondestructive Testing of HPI Nozzles Revealed 3A2 Thermal Sleeve Displaced & Cracks in Inside Diameter of Piping & Safe End.Caused by Thermal Fatigue Due to Loose Thermal Sleeve.Piping Replaced | Thermal fatigue |
| ML20052A399 | 9 April 1982 | LER 82-009/01T-0:on 820329,five Differential Pressure Regulators for Oxygen Supply on Channel B Hydrogen Analyzer Found Defective.Caused by Mfg Deficiency | |
| ML20052A514 | 26 March 1982 | LER 82-005/01T-0:on 820312,insp of Fuel Assembly W/Experimental Zircaloy Spacer Grids Revealed That Grids Had Moved from Normal Position.Caused by Loss of Contact W/Mark B4 Grids Due to Weak Springs & Too Much Gap Growth | |
| ML20050B017 | 12 March 1982 | LER 82-002/03L-0:on 820210,reactor Protection Sys Channel B Hot Leg Temp Readings Were Lower than Those of Channels A,C & D.Caused by Failure of Liner Bridge in Input Circuitry for Channel B Indication.Bridge Replaced | |
| ML20050B058 | 12 March 1982 | LER 82-002/01T-0:on 820222,control Operator Moved Group 8 Control Rods Into Tech Spec Restricted Area to Clear Core Axial Imbalance Alarm.Caused by Operator Error.Rod Position Corrected & Computer Alarms Modified to Include Group 8 | |
| ML20050A971 | 11 March 1982 | LER 82-003/01T-0:on 820211,steam Generator Tube Leak of Approx 0.01 Gpm Indicated by Condensate Steam Air Ejector Offgas Monitor.Caused by Erosion of Tube at Point 31 Inches Above Fifteenth Tube Support Plate.Tube Explosively Plugged | Eddy Current Testing |
| ML20042A516 | 9 March 1982 | LER 82-003/01T-0:on 820209,steam Generator Tube Leak of Approx 0.11 Gpm Was Indicated by Condensate Steam Air Ejector Offgas Radiation Monitor.Caused by Crack on Tube 74-2.Tube Stabilized & Plugged | Eddy Current Testing |
| ML20041F861 | 5 March 1982 | LER 82-001/03L-0:on 820203,motor Driven Emergency Feedwater Pump 1B Declared Inoperable Due to Bearing Vibration Exceeding Acceptable Limits.Caused by Misalignment Between Pump & Motor.Pump & Motor Realigned & Tested Satisfactorily | |
| ML20041F828 | 3 March 1982 | LER 82-004/01T-0:on 820217,exam of Radiograph on Weld 85 on Isometric Drawing 11 Indicated Circumferential Void.Caused by Improper fit-up Weld & Insp During Initial Const.Section of Weld Replaced & Socket Welded to Coupling | |
| ML20049J523 | 26 February 1982 | LER 82-001/03L-0:on 820128,channel B Borated Water Storage Tank Level Indication Declared Inoperable Due to Erratic Indication.Caused by Dirt & Oil in Level Indicator Booster Relay & High Thermostat Settings on Sys Heat Trace | |
| ML20052A646 | 19 February 1982 | Updated LER 81-018/01T-1:on 811123,component Cooling Water Discharge Valve to Keowee Tailrace Inadvertently Opened & Failed to Close,Resulting in Loss of Prime for Emergency Cooling Discharge Line.Caused by Procedural Deficiencies | |
| ML20041D658 | 16 February 1982 | LER 82-003/01T-0:on 820202,video Insp of Fuel Assemblies Revealed Broken Holddown Springs on Batch 7 Fuel Assemblies 01K3,01JV & 01KX.Caused by fatigue-induced Cracking at Surface Flaw.Springs Will Be Replaced Before Reload | |
| ML20041A469 | 5 February 1982 | LER 82-002/01T-0:on 820122,three Core Support Assembly Thermal Shield Bolts Found W/Heads Broken Off & Shock Pad Y-2 Attachment Bolts Discovered Broken.Caused by Intergranular Stress Corrosion Cracking.Pad Removed | Stress corrosion cracking |
| ML20040G714 | 29 January 1982 | LER 82-001/01T-0:on 820117,reactor Bldg Equipment Hatch Found Leaking Air Through Gap in Seal.Caused by Personnel Not Verifying Good metal-to-gasket Seal Had Been Made. Procedures Revised to Require Verification of Proper Seal | |
| ML20040E664 | 25 January 1982 | LER 81-020/03L-0:on 811226,borated Water Storage Tank Channel a Level Instrumentation Declared Inoperable Due to Erratic Indication.Cause Undetermined Due to Intermittent Occurrence of Erratic Indication.Instrument Returned to Svc | |
| ML20040B707 | 12 January 1982 | LER 81-024/01T-0:on 811229,high Humidity Environ in West Penetration Room Rendered Both Penetration Room Ventilation Sys Trains Inoperable.Caused by Leak on Valve 1FDW-265.Leak Repaired | |
| ML20039F317 | 31 December 1981 | LER 81-016/03L-0:on 811202,channel C Pump Power Monitor Failed to Send Trip Signal During Online Testing.Caused by Failed 1C on Monitor Logic Board.Board Replaced & Monitor Tested Satisfactorily | |
| ML20039D317 | 23 December 1981 | LER 81-023/01T-0:on 811209,four Gray safety-related Cables Which Did Not Meet Channel Separation Criteria,Discovered on 811125,determined Reportable.Caused by Improper Original Field Installation.Installation Corrected | |
| ML20039D958 | 21 December 1981 | LER 81-018/01T-0:on 811123,component Cooling Water Discharge Valve to Keowee Tailrace Inadvertently Opened & Failed Open. Caused by Personnel Error & Failure of Valve CCW-8.Valve Manually Closed.Procedures Will Be Revised | |
| ML20039D014 | 21 December 1981 | Updated LER 81-019/01T-1:on 811124,const Personnel Severed 2-inch Line Off Water Header Supplying CT-5 Transformer Fire Suppression Sys.Caused by Failure to Start Continuous Fire Watch & Back Up Fire Suppression Sys | Continuous fire watch Fire Watch |
| ML20039C292 | 21 December 1981 | LER 81-014/03L-0:on 811125,channel B flux-imbalance Flow Bistable Found to Trip Outside Tech Spec Limit.Caused by non-linear Gain on Reactor Protection Sys Channel B Scaled delta-flux Amplifier.Amplifier Replaced | |
| ML20038C897 | 4 December 1981 | LER 81-022/01T-0:on 811113,six Variable Spring Hangers on Emergency Feedwater Discharge Found Not Carrying Specified Design Loads.Caused by High Temp Conditions During Loading. Hangers to Be Replaced & Insulated from High Temp Environ | |
| ML20038A989 | 13 November 1981 | LER 81-017/01T-0:on 810919,while Attempting to Initiate Decay Heat Cooling to Stop Steam Generator Tube Leak,Valve 2LP-2 Failed to Open Electrically or Manually.Apparently Caused by Bent Valve Stem.Valve Stem Replaced | |
| ML20038B193 | 13 November 1981 | LER 81-016/01T-0:on 810918,steam Generator Tube Leak of Approx 0.03 Gpm & Increasing to 25-30 Gpm,Indicated by Monitor.Apparently Caused by Circumferential Crack of Tube 77-2 at 15th Support Plate.Tube Stabilized & Plugged | |
| ML20038B185 | 4 November 1981 | Updated LER 81-019/01T-0:on 811019 & 20,four Separate Liquid Waste Releases Made W/Inoperable Effluent Monitors & Inadequate Water Samples.Caused by Failure to Identify Sample Point Change Due to Temporary Sys Mod | |
| ML20011A747 | 20 October 1981 | LER 81-018/03L-1:on 810911,safety-related Battery Surveillance Procedures Found Out of Compliance W/Revised Tech Spec 4.6.9.Caused by Personnel Failure to Identify Necessary Procedure Changes.Procedures Revised | |
| ML20010J023 | 17 September 1981 | LER 81-016/01T-0:on 810903,magnetic Particle Testing on 1A2 Reactor Coolant Pressure Seal Housing Bolts Revealed Linear Indications.Bolts W/Rejectable Indications Will Be Replaced | |
| ML20010H922 | 14 September 1981 | LER 81-013/03L-0:on 810815,reactor Bldg Spray Pump 2A Declared Inoperable Due to Oil Leak on Bearing Oil Reservoir.Caused by Loose Piping Allowing Leakage.Reservoir Refilled W/Oil | |
| ML20010F828 | 4 September 1981 | LER 81-011/03L-0:on 810806 & 07,RCS Subcooling Margin Monitor Was Inoperable & Backup Method Unavailable.Caused by out-of-svc Unit 2 Operator Aid Computer Due to Malfunction of AGRA2 Group Relay Board & Matrix Card | |
| ML20010E778 | 25 August 1981 | LER 81-015/01T-0:on 810811,modules in Reactor Protection Sys Were Found to Have Errors Larger than Originally Calculated Values.Errors re-evaluated & Setpoints Changed to New Settings | |
| ML20010D237 | 17 August 1981 | LER 81-015/01T-0:on 810720,while Attempting to Perform Engineered Safeguard Periodic Test,Low Pressure Injection Pump 3-B Failed to Start.Caused by Personnel Error.Pump Motor Bearings Replaced & Personnel Counseled | |
| ML20010F451 | 31 July 1981 | LER 81-014/01L-0:on 810717,A & B High Pressure Svc Water Pumps Discovered W/O Control Power Indication & Elevated Water Storage Tank Showed Zero Level.Caused by Control Breaker Source a & B Breakers Being Open & Blown Fuse | |
| ML20009G633 | 24 July 1981 | LER 81-012/03L-0:on 810624,discovered safety-related Hydraulic Snubber on Atmospheric Dump Line B Was Broken at Rod Eye.Caused by Vibration.Snubber Repaired | Earthquake |