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| Issue date | Title | Topic | |
|---|---|---|---|
| ML20045G788 | 1 July 1993 | LER 93-004-00:on 930602,discovered Potential Torus Condition Outside Design Basis.Caused by Inadequate Design Info. Documentation Procedures Revised.Torus Calculations to Include Peak Pressure info.W/930701 Ltr | |
| ML20028H691 | 21 January 1991 | LER 90-016-00:on 901220,senior Reactor Operator Licensed Group Shift Supervisor Left Control Room W/O Replacement, Resulting in Lack of Operator in Control Room for 4 Minutes. Both Operators Returned to Control room.W/910121 Ltr | |
| ML20044B383 | 12 July 1990 | LER 90-007-00:on 900614,discovered That Numerous Fire Detection Instruments Exceeded Max Allowable Interval for 6-month Operability Test.Caused by Personnel Error. Procedures for Surveillance Tests changed.W/900712 Ltr | Fire Protection Program |
| ML20043G093 | 8 June 1990 | LER 90-006-00:on 900511,average Power Level Exceeded Licensed Limit by Approx 1.64 MW When Cleanup Sys Placed in Svc W/O 7.84 MW Loss Added Into Heat Balance Calculation. Caused by Personnel Error.Procedures changed.W/900608 Ltr | |
| ML20043B118 | 18 May 1990 | LER 89-023-01:on 891209,four of Six Low Vacuum Scram Setpoints Found Out of Spec Due to Drift of Sensing Element & Lack of Margin for Drift in as-left Setpoint in Calibr Procedure.Instrument Setpoint adjusted.W/900518 Ltr | VT-2 |
| ML20043A428 | 15 May 1990 | LER 90-025-01:on 891216,operator Inadvertently Selected Incorrect Control Rod,Then Selected Correct Rod When Error Realized.Second Control Room Operator Will Be Used to Assure That No Signal Failure Will Move Two rods.W/900515 Ltr | |
| ML20012D944 | 21 March 1990 | LER 90-004-00:on 900220,operation of hand-held Radio Near Analog Trip Units Caused Sys to Actuate & Air Operated Valves Repositioned.Caused by Personnel Error.Use of Radios Must Be Approved by Supervisor of technicians.W/900321 Ltr | Reactor Vessel Water Level |
| ML20012D160 | 14 March 1990 | LER 90-003-00:on 900215,seven Control Rods Withdrawn During Reactor Startup While Rod Minimizer Was Bypassed.Caused by Personnel Error.Withdrawal Stopped & Keylock Switch Placed in Normal position.W/900314 Ltr | |
| ML20012D158 | 14 March 1990 | LER 89-017-01:on 890711,main Generator Tripped Due to Phase Differential Condition Caused by Fault in Operating Maint Output Transformer.Caused by Equipment Failure.Oil Boxes on Transformers repaired.W/900314 Ltr | Main transformer failure |
| ML20012A173 | 27 February 1990 | LER-89-023-00:on 891209,four Out of Six Condenser Low Vacuum Setpoints Found at Values Less Conservative than Tech Spec Limit.Caused by Sensing Element Drift & Lack of Margin for Drift in Calibr Procedure.Setpoint changed.W/900227 Ltr | VT-2 |
| ML20011F440 | 22 February 1990 | LER 90-001-00:on 900123,fire Alarm Received for Fire Zone in Cable Spreading Room,Resulting in Operability of Deluge Sys. Continuous Fire Watch Not Established.Caused by Inadequate Procedural Guidance.Detectors disabled.W/900222 Ltr | Fire Barrier Continuous fire watch Fire Watch Hourly Fire Watch |
| ML19354D834 | 12 January 1990 | LER 89-021-01:on 890922,ref Leg of Level Instrument Vented to Test Equipment,Causing False High Reactor Pressure Vessel Signal.Caused by Trip of Turbine Generator Resulting in Scram.Excess Flow Check Valve depressurized.W/900112 Ltr | |
| ML19327C066 | 6 November 1989 | LER 89-022-00:on 891005,Tech Spec Violation Occurred When Licensed Group Shift Supervisor Left Control Room W/O Informing Operating Supervisor.Caused by Personnel Error. Individual Involved counseled.W/891106 Ltr | |
| ML19351A416 | 13 October 1989 | LER 89-020-00:on 890915,operator Trainee Identified That Knife Switch Used to Select Dc Control Power Source for 480 Volt Ac Unit Substation 1B2 Was Selected.Caused by Procedural Inadequacy.Lineup Sheet used.W/891013 Ltr | Safe Shutdown |
| ML19327A808 | 11 October 1989 | LER 89-019-00:on 890911,emergency Diesel Generator Became Inoperable.Caused by Dirt on Wiper of Motorized Potentiometer in Peaking Load Control Circuit & Latent Heat Expansion of Engine.Fuel Injectors replaced.W/891011 Ltr | |
| ML19327B496 | 23 September 1989 | LER 89-021-00:on 890922,false High Reactor Pressure Vessel Water Level Caused Turbine Generator Trip & Reactor Scram. Caused by Personnel Not Following Surveillance Procedure.All Involved Instruments Calibr checked.W/891023 Ltr | |
| ML20028G443 | 28 January 1983 | LER 82-063/03L-0:on 821227,operability of Control Rod Drive Pump a Not Demonstrated During 1-month Period.Caused by Breakdown in Administrative Controls for Surveillance Test Program.Surveillance Completed | |
| ML20028G236 | 28 January 1983 | LER 82-064/03L-0:on 821230,containment Spray Sys 1 Declared Inoperable Due to High Baffle Plate Differential Pressure Readings on 1-2 Hx.Caused by HX Fouling.Hx Inspected & Cleaned & Chlorination Sys for Emergency Svc Water Repaired | |
| ML20028E774 | 20 January 1983 | LER 82-061/03L-0:on 821216,offgas Isolation Valve Failed to Close Fully on Independent Closure Signal.Caused by Defective Pilot Solenoid Valves Due to Foreign Matter on Solenoid Valve Seat Prohibiting Termination of Air Supply | |
| ML20028C799 | 29 December 1982 | LER 82-058/03L-0:on 821128,main Steam Line Drain Valves V-1-106 & V-1-110 Failed to Close Fully.Cause Unknown. Investigation Will Continue During Next Outage | |
| ML20028C754 | 27 December 1982 | LER 82-059/03L-0:on 821124,reactor Circulation Pump a Taken Out of Svc.Caused by Indications of Leaking Seals.Seal Confirmed to Be Leaking During Subsequent Shutdown. Cartridge Assembly Replaced | |
| ML20027B915 | 16 September 1982 | LER 82-046/03L-0:on 820815,controls Keeping Main Line Drain Valves Deactivated in Isolation Position Were Defeated Prior to Temp Dropping Below 212 F.Caused by Personnel Error.Personnel Reinstructed | |
| ML20052E654 | 3 May 1982 | LER 82-021/01T-0:on 820416,containment Oxygen Concentration Not Reduced within 24-h After Run Mode & Drywell to Torus Differential Pressure Greater than 1 Psi.Caused by Loss of 6-h Inerting Time Due to Insufficient Nitrogen | |
| ML20052E216 | 28 April 1982 | LER 82-017/03L-0:on 820325,normal Auxiliary Power Bus 1C Relay Failed Totally & Svc Water Pump Trip Time Delay Relay SK8A Failed to Operate within Tech Spec Limits.Power Bus Failure Caused by Normal End of Life | |
| ML20052B094 | 16 April 1982 | LER 82-020/01T-0:on 820328,MSIV Leak Rate Testing Disclosed Deterioration of Valve Internals on NS03-A & Packing Leak on Outboard Valve NS04-A.Caused Not stated.NS03-A Disassembled & repaired.NS04-A Repacked | Packing leak |
| ML20052G001 | 16 April 1982 | LER 82-021/01P:on 820416,primary Containment Atmosphere Not Reduced to Less than 5% Oxygen within 24-h After Reactor Mode Selector Switch Placed in Run Position.Caused by Insufficient Nitrogen & Blown Rupture Disc | |
| ML20050D909 | 29 March 1982 | LER 82-013/03L-0:on 820128,low Voltage Annunciator Relay Setting for Main Station Batteries B & C & Diesel Generator 2 Battery Relay & Setting Found Below Tech Specs Limit. Caused by Annunciation Setpoints Out of Spec | |
| ML20050A505 | 19 March 1982 | LER 82-008/03L-0:on 820210,monthly Channel Check of Secondary (Thermocouples) Safety & Relief Valve Position Monitoring Sys Not Performed as Required by Tech Spec. Caused by Lack of Administrative & Procedural Controls | |
| ML20042B295 | 15 March 1982 | LER 82-012/01P-0:on 820226,air Operated Vacuum Breaker V-26-18 Exceeded Allowable Leak Rate.Caused by Improper Alignment of Valve Shaft & Operator Due to Inadequate Maint Instructions.Valve Realigned & Procedures Will Be Revised | |
| ML20042B314 | 12 March 1982 | LER 82-009/03L-0:on 820210,overload Trip Occurred on Standby Gas Treatment Sys Exhaust Fan 1-8.Apparently Caused by Change in Breaker Trip Setpoint.Further Testing Underway | |
| ML20042A628 | 10 March 1982 | LER 82-011/03L-0:on 820208,three Hydraulic Snubbers Were Inoperable & Accelerated Surveillance of Tech Spec 4.5.0.3 Was Not Performed.Caused by Component Failure.Snubbers Replaced W/Certified Operable Snubbers | |
| ML20042A294 | 5 March 1982 | LER 81-071/01T-0:on 811231,radwaste Liquid Effluent Monitor Found Inoperable.Proper Surveillance Not Performed.Caused by Personnel Error & Lack of Administrative & Procedural Controls.Control Procedures Written & Parts Replaced | |
| ML20042A113 | 4 March 1982 | LER 82-010/01T-0:on 820218,deluge Sys for Reactor Bldg Elevation 51 Ft Actuated Due to Smoke from Overheated Bearing in Cleanup Sys Auxiliary Pump Motor.Caused by Inadequate Electrical Sealing Techniques | |
| ML20052G028 | 1 March 1982 | LER 82-012/01P:on 820226,reactor Bldg to Suppression Chamber Vacuum Breaker Valve V-26-18 Found Improperly Installed. Caused by Inadequate Procedure.Valve Shaft Realigned | |
| ML20041D807 | 26 February 1982 | LER 82-006/01T-0:on 811203,one Trip Sys in Automatic Depressurization Sys Rendered Inoperable by Removal of Dc Control Power Fuses.Caused by Nonrating of Microswitches Inside IA83-A Replacement.All EMRV Switches Replaced | |
| ML20041D802 | 25 February 1982 | LER 82-007/03L-0:on 820126,main Steam Line High Flow Sensor RE-22H Tripped at Greater Value than Given in Tech Specs. Caused by Instrument Repeatability & Drift.Sensor Reset & Setpoints Lowered | |
| ML20041D782 | 25 February 1982 | LER 82-005/03L-0:on 820125,during Load Surveillance Test, Diesel Generator 1-1 Tripped on Engine Fault.Caused by Reduction of Water Inventory in Cooling Sys as Result of Radiator Tube Leak.Leaky Tubes Plugged | |
| ML20041D468 | 22 February 1982 | LER 82-004/03L-0:on 820121,reactor Bldg Closed Cooling Water Drywell Isolation Valve V-5-167 Failed to Fully Close.Caused by Lack of Stem/Stem Nut Lubrication &/Or Packing Problem. Stem,Stem Nut & Bearing Lubricated & Valve Repacked | |
| ML20041D580 | 19 February 1982 | LER 82-002/03L-0:on 820118,installation of Mod Could Have Led to Possible Failure to Maintain Primary Containment Integrity.Change Defeated Automatic Withdrawal Function 3 & 4 TIP Detectors.Caused by Inadequate Safety Review | |
| ML20041D379 | 19 February 1982 | LER 82-003/03L-0:on 820122,containment Spray High Drywell Pressure Indicating Switch IP25B Found to Trip at Value Greater than Tech Spec Limits.Caused by Instrument Repeatability.Switch Reset | |
| ML20041A223 | 5 February 1982 | LER 81-061/03L-0:on 811223,nine Snubbers on Core Spray, Containment Spray,Isolation Condenser & Shutdown Cooling Sys Determined Inoperable Due to Oil Leakage.Cause to Be Determined.Snubbers Replaced W/Operable Spares | |
| ML20040F530 | 1 February 1982 | LER 82-001/03L-0:on 820128,during Testing,Containment Spray High Drywell Pressure Indicating Switches IP15A,IP15B & IP15C Found to Trip at Values Greater than Tech Spec Limits. Caused by Instrument Repeatability.Switches Reset | |
| ML20040F483 | 28 January 1982 | LER 81-070/03L-0:on 811231,isolation Condenser Isolation Pipe Break Sensor IB11A1 Tripped Above Tech Spec Limit. Caused by Instrument Repeatability.Setpoint Lowered.Switches Will Be Replaced During Future Refueling Outage | |
| ML20040F520 | 28 January 1982 | LER 81-072/03L-0:on 811229,core Spray Sys I Parallel Isolation Valve V-20-15 Became Inoperable in Partially Open Position.Caused by High Motor Current Drawn When Valve Close Signal Inadvertently Intiated During Valve Stroking | |
| ML20040E428 | 26 January 1982 | LER 81-069/03L-0:on 811230,during Surveillance Testing,Core Spray High Drywell Pressure Switches RV-46A,RV-46B & RV-46D Tripped.Caused by Instrument Repeatability.Switches Reset. Setpoint Changed to Reflect Inherent Design Error | |
| ML20040D755 | 20 January 1982 | LER 81-067/03L-0:on 811220,during Maint Testing,Scram Pilot Solenoid Valve 118 (for Control Rod Drive 14-23) Failed When Rod Was Individually Scrammed.No Plausible Cause Could Be Postulated.All Scram Solenoids Will Be Verified Operable | |
| ML20040C663 | 18 January 1982 | LER 81-068/03L-0:on 811218,reactor Triple Low Water Level Indicator Switch RE18A Tripped at Monometer Reading Exceeding Tech Spec Limit.Caused by Instrument Drift.Switch Reset.Setpoint Sensors Will Be Replaced | |
| ML20040B150 | 31 December 1981 | LER 81-066/03L-0:on 811201,during Surveillance Testing,Main Steam Line High Flow Sensors RE22C,RE22E & RE22F Tripped at Values Greater than Tech Specs Limit.Caused by Instrument Repeatability & Drift.Sensors Reset | |
| ML20039G098 | 23 December 1981 | LER 81-065/01T-0:on 811209,shutdown Commenced to Investigate a Isolation Condenser Isolation Valve V-14-30 811203 & 04 Failure to Operate Properly.Caused by Excessive Stress on Valve Backseat & Damage to Stem Nut | |
| ML20039G189 | 23 December 1981 | LER 81-062/03L-0:on 811125,core Spray Hi Drywell Pressure Switch RV46C Tripped in Excess of Tech Spec Limit.Caused by Sensor Repeatability.Sensor Recalibr |