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| Issue date | Title | Topic | |
|---|---|---|---|
| ML20024J320 | 7 October 1994 | LER 94-022-00:on 940907,TS Violation Occurred Due to Inadequate Fire Watch.Retrained Personnel Associated W/ Painting activities.W/941007 Ltr | Fire Barrier Continuous fire watch Fire Watch |
| ML20029E200 | 13 May 1994 | LER 94-006-00:on 940414,SS Recognized That Required Frequency for Performing STP 057-3705 Had Been Exceeded. Caused by Inadequate Supervisory Methods.Corrective Action: Inhouse Tracking Process Will Be created.W/940513 Ltr | |
| ML20029C874 | 26 April 1994 | LER 93-026-01:on 931117,isolation of RCIC Sys Occurred Due to Apparent Failure of Relay.Three Relays Associated W/ Isolation Replaced & Shipped to Mfg for Failure Analysis.W/ 940426 Ltr | |
| ML20029C702 | 19 April 1994 | LER 90-003-05:on 900206,discovered Deficiencies in Thermo-Lag Fire Barrier Envelope Around Redundant Safe Shutdown.Firewatches Established in Areas Where Thermo Lag Used as barrier.W/940419 Ltr | Safe Shutdown Fire Barrier Fire Watch |
| ML20046C389 | 2 August 1993 | LER 93-014-00:on 930701,installed Sprinkler Sys as Substitute for Passive fire-rated Barrier Due to Deficiency Identified in Fire Barrier Separation Requirements.Declared Fire Barriers Surrounding Valves degraded.W/930802 Ltr | Safe Shutdown Fire Barrier |
| ML20046B898 | 29 July 1993 | LER 93-013-00:on 930629,high Pressure Core Spray Pump Failed to Start & Run During Surveillance Test Due to Failed Overfrequency Relay.Relay Tested & Installed in Switchgear. W/930729 Ltr | |
| ML20046A236 | 22 July 1993 | LER 93-008-01:on 930429,relief Request Improperly Prepared for Insvc Testing Program Results in Noncompliance W/Main Steam Isolation Valve Testing Requirement.Caused by Personnel Error.Testing Frequency Revised | Cold shutdown justification |
| ML20045G611 | 2 July 1993 | LER 93-012-00:on 930603,deficiency in Plant Surveillance Test Procedures Identified.Caused by Primary Causal Factor Inattention to Detail During Initial Procedure Development Process.Surveillance Test Procedures performed.W/930702 Ltr | |
| ML20045D699 | 21 June 1993 | LER 93-011-00:on 930521,determined That Mode Switch Placed in Refuel Position During Testing of Switch Interlock Functions.Caused by Conflicting Info in Surveillance Procedures.Operating Procedure revised.W/930621 Ltr | |
| ML20045C014 | 14 June 1993 | LER 93-010-00:on 930514,SDC Lost for Approx Three Minutes When One SDC Suction Valve Closed Due to Initiation of Spurious ESF Actuation Signal.Caused by Personnel Error. Procedural Guidance revised.W/930614 Ltr | |
| ML20045C002 | 14 June 1993 | LER 93-003-01:on 930225,incidents Discovered Which Caused Interlock Mechanism in Upper Containment Airlocks at Elevation 171 to Operate Improperly.Case Study Training Class Developed for Airlock incidents.W/930614 Ltr | |
| ML20045A146 | 4 June 1993 | LER 93-009-00:on 930504,discovered That Surveillance Test Procedure for Control Bldg Chilled Water Sys Quarterly Pump Missed Due to Cognitive Personnel Error.Administrative Procedure Will Be revised.W/930604 Ltr | Missed surveillance |
| ML20045A426 | 1 June 1993 | LER 93-002-02:on 930212,discovered That TS SRs Not Properly Implemented in Logic Sys Functional Tests Due to Inattention to Detail While Preparing Revs of Relevant Surveillance Test Procedures (Stp).Relevant STPs revised.W/930601 Ltr | |
| ML20044H357 | 1 June 1993 | LER 93-008-00:on 930429,investigation Determined That Relief Request for Inservice Testing of Pumps & Valves in Conflict W/Msiv Testing Requirements.Caused by Personnel Error.Relief Request 40 revised.W/930601 Ltr | Cold shutdown justification |
| ML20044G740 | 26 May 1993 | LER 93-006-00:on 930419,MSIV Failed to Stroke Closed When Given Close Signal from CR Due to Poppet Sticking.Caused by Insufficient poppet-to-guide Rib Clearance.Stricter Controls Imposed to Control clearances.W/930526 Ltr | |
| ML20044F254 | 20 May 1993 | LER 93-007-00:on 930420,noted That an Isolation of Inboard & Outboard MSIV & Ms Line Drains Occurred.Caused by Lack of Personnel Knowledge of Unique Maint Conditions.Precaution Will Be Added to Sys Operating procedure.W/930520 Ltr | |
| ML20044D851 | 17 May 1993 | LER 93-005-00:on 930415,discovered That RCIC Steam Line Flow - High Timer Function Never Performed on Monthly Basis. Caused by Failure to Include Test in Initial Procedure Development Process.Procedures revised.W/930517 Ltr | |
| ML20024H238 | 21 May 1991 | LER 91-003-01:on 910322,Div II Control Power Circuit Deenergized,Resulting in Deenergization of Charcoal Filter Train Suction Dampers.Caused by Inadequate Work Plan.Plan Revised to Document Restoration of wiring.W/910521 Ltr | |
| ML20024G744 | 22 April 1991 | LER 91-003-00:on 910322,control Bldg Local Air Intake Radiation Monitor Control Power Circuit Deenergized, Resulting in Isolation of air-operated Dampers.Caused by Inadequate Work Plan.Work Plan revised.W/910422 Ltr | |
| ML20024G718 | 19 April 1991 | LER 91-004-00:on 910321,RCIC Turbine Main Steam Supply Line Outboard Containment Isolation Valve Isolated.Caused by Negative Trip Setpoint of Trip Unit Being Reached.Caution Added to RCIC Sys Operating procedures.W/910419 Ltr | Packing leak |
| ML20029C121 | 14 March 1991 | LER 91-001-00:on 910212,use of Inadequate Control Room Filter Initiation Signal Due to Discrepancies Between Logic Diagrams.Main Control Room Doses Due to MSLB Outside Containment recalculated.W/910314 Ltr | |
| ML20029B134 | 26 February 1991 | LER 90-033-01:on 901104,RWCU Sys Isolation Occurred While Performing Plant Mod to Power Supply Wiring in Control Room Panel 1H13-P642.Caused by Removal of Terminal Screw.Power Supply reterminated.W/910226 Ltr | |
| ML20028H396 | 18 December 1990 | LER 90-032-01:on 901021,discovered That Five Snubbers Removed from Standby Svc Water Sys Piping in Violation of Tech Spec 3.7.4.Caused by Scheduling Error & Inadequate Review.Training Will Be Completed on 910331.W/901218 Ltr | |
| ML20024F748 | 10 December 1990 | LER 90-040-00:on 901110,technician Inadvertently Shorted Relay Terminals,Energizing Relay & Causing Emergency Diesel Generator to Start Unexpectedly.Caused by Personnel Error. Generator Manually secured.W/901210 Ltr | |
| ML20044B195 | 12 July 1990 | LER 90-003-01:on 900206 to 08,deficiencies Found in thermo-lag Fire Barrier Envelopes Redundant Safe Shutdown Circuits.Fire Watch Established.Util Working W/Vendor to Resolve discrepancies.W/900712 Ltr | Safe Shutdown Fire Barrier Fire Watch |
| ML20044A378 | 22 June 1990 | LER 90-023-00:on 900523,discovered That Annulus Ventilation Radiation monitor,1RMS*RE11A Inoperable.Caused by Failure of Radiation Monitor Sample Pump & Failure of Switch to Actuate.Flow Switches replaced.W/900622 Ltr | |
| ML20043F472 | 8 June 1990 | LER 90-021-00:on 900509,RWCU Sys Differential Flow High Trip Instrumentation Inoperable for Period Greater than Allowed by Tech Spec.Caused by Misinterpretation of Tech Spec 3/4.3.2,Table 3.3.2.-1.4.Personnel retrained.W/900608 Ltr | |
| ML20043D583 | 1 June 1990 | LER 90-020-00:on 900504,radwaste Operator Entered High Radiation Area W/O Dose Rate Meter,Alarming Dosimeter or Radiation Protection Technician Coverage.Caused by Personnel Error.Training Provided to operators.W/900601 Ltr | High Radiation Area |
| ML20043B803 | 24 May 1990 | LER 90-019-00:on 900425,RWCU Sys Isolation & ESF Actuation Occurred After Completion of Channel Check of Riley Temp Trip Unit.Caused by Unit Exceeding Differential Temp Setpoint of 46 F.Unit replaced.W/900524 Ltr | |
| ML20043B330 | 21 May 1990 | LER 90-017-00:on 900419,inadequate Fire Barrier in Shake Space Occurred Contrary to Tech Spec.Caused by Oversight. Roving Fire Watch Scheduled.Maint Will Rework Voids & Install Seismic Gap seal.W/900521 Ltr | Safe Shutdown Fire Barrier Fire Watch |
| ML20043C028 | 19 May 1990 | LER 90-018-00:on 900420,ESF Actuation Occurred Causing Reactor Water Sample Containment Isolation Valve to Close. Caused by Failure of Fuse Which Deenergized Isolation Logic of Valves.Fuse replaced.W/900518 Ltr | |
| ML20042G798 | 10 May 1990 | LER 90-016-00:on 900414,insulator Fault on Local Grid Resulted in Trip of 500 Kv Breaker.Caused by Spurious Alarm Signal from Control Room Local Intake Radiation Monitor 1RMS*RE13B.Sys Returned to Normal operation.W/900510 Ltr | |
| ML20042G800 | 9 May 1990 | LER 90-015-00:on 900409,loss of Div II Reactor Protection Sys Bus Occurred Due to Trip of Electrical Protection Assembly.Another Trip Also Occurred on 900415.Caused by Faulty Integrated Circuit logics.W/900509 Ltr | Half scram |
| ML20042G450 | 7 May 1990 | LER 90-013-00:on 900405,discovered That Control Bldg Chiller Motor Current Limiter C Set Incorrectly at 56% Instead of 100%.Caused by Incorrect Setting & Maint Activities.Loop Calibr Data Sheet revised.W/900507 Ltr | |
| ML20042G453 | 7 May 1990 | LER 90-014-00:on 900407,reactor Scram Occurred While Testing Main Turbine Combined Intermediate Valves.Caused by Low Pressure Signal from Emergency Trip Sys of Electrohydraulic Control Sys.Two Solenoid Valves replaced.W/900507 Ltr | Safe Shutdown |
| ML20042F473 | 1 May 1990 | LER 90-012-00:on 900401,ESF Actuations Occurred Due to Electrical Protection Assembly Breakers Trip.Caused by Voltage Regulator Failure.Replacement Voltage Regulator Card Installed in MG 1C71-S001B.W/900501 Ltr | Half scram |
| ML20042E223 | 9 April 1990 | LER 90-007-00:on 900311,control Bldg Ventilation Sys Isolated & Filtration Unit Initiated.Caused by Severe Electrical Transient.Performance of Radiation Monitors Improved Prior to Implementation of procedures.W/900409 Ltr | |
| ML20012C074 | 12 March 1990 | LER 90-004-00:on 900211,Div II Emergency 125-volt Dc Bus Experienced Voltage Spike,Causing Topaz Inverter to Trip & Resulting in Loss of Power to Control Room Panel.Cause Unknown.Setpoint Changes Being evaluated.W/900312 Ltr | |
| ML20012C419 | 8 March 1990 | LER 90-003-00:on 900206,found That Several Minor Deficiencies Existed in thermo-lag Fire Barrier Envelopes Redundant Safe Shutdown Circuits.Util Currently Working W/ Vendor to Resolve Identified discrepancies.W/900308 Ltr | Safe Shutdown Fire Barrier Fire Watch |
| ML20011E249 | 31 January 1990 | LER 88-018-04:on 880825,reactor Scram Occurred Due to Main Generator Exciter Brush Failure.Preventive Maint Procedure Revised to Establish Specific Wear Criteria at Which Brushes to Be replaced.W/900131 Ltr | Safe Shutdown Slow transfer |
| ML20011E246 | 31 January 1990 | LER 89-036-01:on 891007,discovered That Various motor- Operated Valves Energized,Contrary to Assumptions Contained in Plant Fire Hazards Analysis.Cause Not Stated.Operations Initiated Required Fire Watches on valves.W/900131 Ltr | Safe Shutdown Fire Barrier |
| ML20011E119 | 30 January 1990 | LER 90-001-00:on 900103,isolation of RCIC Steam Supply Inboard Isolation Valve Occurred During Surveillance Testing of RCIC Sys.Caused by Technician Lifting Wrong Lead,Causing ESF Actuation.Lead Relanded on terminal.W/900130 Ltr | |
| ML20011E118 | 30 January 1990 | LER 89-033-01:on 890916,loss of Power to Div II 120-volt Ac Distribution Panel Caused auto-start of Standby Gas Treatment & Annulus Mixing Sys,Resulting in ESF Actuations. Caused by Transformer Failure.Valves opened.W/900130 Ltr | |
| ML20005G164 | 10 January 1990 | LER 89-044-00:on 891211,unplanned ESF Actuation Occurred, Resulting in Isolation of Rcic.Caused by Technician Failing to Perform Steps of Surveillance Test Procedure in Sequence.Div II Isolation Signal reset.W/900110 Ltr | |
| ML20005G166 | 10 January 1990 | LER 89-045-00:on 891212,Div I Standby Svc Water Pumps Received Automatic Start Signal Due to Spurious Low Svc Water Pressure Signal When Normal Svc Water Pump Secured. Signal Cleared & Sys Restored to Normal lineup.W/900110 Ltr | |
| ML20005E852 | 2 January 1990 | LER 89-043-00:on 891201.two Outboard MSIVs Inoperable Due to Failure of Corresponding Fast Closure solenoid-operated Valve.Caused by Incomplete Removal of Silicone Lubricant. Lubricant Removed by Application of Acetone.W/900102 Ltr | |
| ML20005E851 | 2 January 1990 | LER 89-042-01:on 891201,main Turbine Generator Tripped, Resulting in Reactor Scram.Caused by Sensing Fault on Offsite 230 Kv Line.Sys Maint Procedure Being Revised to Include Test of Failed Portion of relay.W/900102 Ltr | Safe Shutdown Slow transfer |
| ML20005E138 | 26 December 1989 | LER 89-041-00:on 891125,unplanned ESF Actuation Occurred as Result of Two Leads Shorted Together During Testing of Control Circuitry,Causing Valve Isolation from Suppression Pool.Sys Lineup Restored to Normal position.W/891226 Ltr | |
| ML20011D620 | 18 December 1989 | LER 89-040-00:on 891117,surveillance Test of Div II Penetration Valve Leakage Control Sys Air Supply Header Pressure Not Performed within Allowable Tolerance.Addl Training of Scheduling Group Will Be provided.W/891218 Ltr | Time of Discovery |
| ML20011D137 | 14 December 1989 | LER 89-039-00:on 891114,discovered That Required post-maint Overall Leak Rate Test on Upper Containment Airlock Not Performed After Replacement of Inflatable Seal.Caused by Personnel Error.Maint Procedure revised.W/891214 Ltr |