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| Issue date | Title | Topic | |
|---|---|---|---|
| ML18011A540 | 10 August 1994 | LER 94-017-00:on 940711,automatic Isolation of RHR Sys Shutdown Cooling Suction Outboard Containment Isolation Valve Occurred Due to Inadequate Work Order.Work Order Process for I&C Work Orders Will Be reviewed.W/940810 Ltr | Half scram |
| ML20046C572 | 6 August 1993 | LER 93-015-00:on 930709,unexpected RRP Fast to Slow Speed Downshift Occurred Due to Failure of Both RRP Suction Temp Rtd.Replaced & Returned RTD to Mfg for Failure Analysis. W/930806 Ltr | Scram Discharge Volume |
| ML20046B781 | 2 August 1993 | LER 93-014-00:on 930703,TS 3.0.3 Entered Due to Failure of Racs Power Supply.Replaced 5 Volt Power Supply in Racs cabinet.W/930802 Ltr | |
| ML20045G720 | 8 July 1993 | LER 93-013-00:on 930608,control Room HVAC Sys Train a Supply Fan Tripped on Overcurrent,Resulting in Both Sys Trains Being Unavailable.Caused by Motor Winding Insulation Failure.Motor Repaired by mfg.W/930708 Ltr | |
| ML20045G217 | 7 July 1993 | LER 93-012-00:on 930607,noted That HPCS Initiation Signal Resulted in Auto Start of Div 3 DG & ESW Sys.Caused by Failure of Div 3 Reserve Battery Charger.Procedures Used for Insp & Maint of Battery Being modified.W/930707 Ltr | |
| ML20044F216 | 19 May 1993 | LER 93-011-00:on 930419,identified That Excessive Strainer Differential Pressure Across RHR Suction Strainers Could Have Compromised Long Term Cooling During LOCA Operation. Caused by Inadequate Program requirements.W/930519 Ltr | |
| ML20044B677 | 22 February 1993 | LER 93-004-00:on 930121,MOV Testing of Main Steam Line Drain & Bypass Outboard Isolation Valve Indicated That Thrust Less than Design Thrust to Close Valve Under Accident Conditions. Review,Per GL 89-10 in progress.W/930222 Ltr | Unanalyzed Condition Time of Discovery Stroke time |
| ML20029B643 | 8 March 1991 | LER 91-007-00:on 910209,pressure Switch Instrument Drift Caused Automatic Start of Annulus Exhaust Gas Treatment Sys. Caused by Component Failure.Switch Recalibrated to Adjust Setpoints to Proper value.W/910308 Ltr | |
| ML20029B097 | 1 March 1991 | LER 91-006-00:on 910202,inboard Isolation Valves Closed on RWCU Delta Flow High Signal During Removal of RWCU Filter from Svc.Caused by Personnel Error.Sys Operating Instruction Being revised.W/910301 Ltr | |
| ML20029A645 | 22 February 1991 | LER 91-005-00:on 910129,discovered That Two Power Supplies Had Excessive Ripple Effect When All Rods Pushbutton Depressed,Resulting in Loss of Scram Accumulator Fault Indication.Caused by Personnel error.W/910222 Ltr | |
| ML20029A332 | 15 February 1991 | LER 91-004-00:on 910120,three Reactor Water level-high (Level 8) Channels Inoperable Due to Blown Fuse.Caused by Voltage Spike.Circuitry Associated W/Trip Relays Modified. W/910215 Ltr | Time of Discovery |
| ML20028H752 | 25 January 1991 | LER 90-041-00:between 901212 & 28,inoperable Reactor Pressure Vessel Level Instrumentation Channels Resulted in HPCS Sys Being Inoperable & in Tech Spec Violation.Caused by Personnel Error.Memo issued.W/910125 Ltr | Reactor Vessel Water Level |
| ML20024F742 | 14 December 1990 | LER 90-033-00:on 901120,Train B of Control Room HVAC Sys Actuated Unexpectedly in Emergency Recirculation Mode.Caused by Inadequate Instruction.Procedure Revised Re Correct Guidance During Loss of Power to Bus K-1-N | |
| ML20024F741 | 14 December 1990 | LER 90-032-00:on 901116,disconnecting Wires to Test Relay Contact Resulted in RHR a Shutdown Cooling Sys Isolation. Caused by Procedure Deficiency & Inadequate Instructions. Personnel Trained Re Review of Work Orders | |
| ML20028G918 | 28 September 1990 | LER 90-020-00:on 900831,maint Activities on Control Room Emergency Recirculation Sys Resulted in Tech Spec Violation & Compromise of Safety Sys.Caused by Program Deficiency. Maint Acitivities & Insp Being revised.W/900928 Ltr | |
| ML20044B102 | 13 July 1990 | LER 90-013-00:on 900619,discovered That Main Steam Line Radiation Monitor C Inoperable for Greater than Time Allowed by Tech Specs 3.3.1.a & 3.3.1.b.Caused by Personnel Error. Personnel counseled.W/900713 Ltr | |
| ML20043H480 | 20 June 1990 | LER 90-011-00:on 900521,discovered That Divisional LPCI & LPCS Sys Inoperable in Excess of Tech Spec Action Limits Between 871119-23 & 891218-22.Caused by Procedural Deficiency.Sys Operating Instruction revised.W/900620 Ltr | Fuel cladding |
| ML20043H525 | 20 June 1990 | LER 90-010-00:on 900521,Tech Spec Action Requirements Not Implemented for Inoperable Control Rod Scram Accumulators. Caused by Inadequate Procedures & Malfunctioning Transformer.Analyzer Reset & Leakage monitored.W/900620 Ltr | |
| ML20043H384 | 18 June 1990 | LER 90-009-00:on 900517,RHR Sys B HX Bypass Valve Failed to Reposition on Demand,Rendering RHR Sys Train Operable for Containment Spray Cooling Mode of Operation.Caused by Failure of Valve Stem Nut.Stem Nut replaced.W/900618 Ltr | Reactor Vessel Water Level Stroke time |
| ML20043E571 | 8 June 1990 | LER 89-030-01:on 891125,plant Entered Tech Spec 3.0.3 Due to Two Untrippable Control Rods.Failure of Two Control Rods Caused by Improper Seat Matl in Associated Scram Pilot Solenoid Valves.Instructions revised.W/900608 Ltr | Shutdown Margin Scram Discharge Volume |
| ML20043A780 | 18 May 1990 | LER 90-007-00:on 900418,ruptured Seal on Outer Door of Upper Containment Airlock Occurred Causing Loss of Containment Integrity.Caused by Inadequate Communications & Equipment Failure.Seal on Outer Door Replaced | |
| ML20043A845 | 18 May 1990 | LER 90-008-00:on 900420,unexpected Isolation of RWCU Sys Occurred.Caused by Component Failure.Faulty Transmitter Transmitter Identified & Replaced | |
| ML20042G773 | 11 May 1990 | LER 90-006-00:on 900411,control Room Emergency Recirculation Sys Found to Be Inoperable & Tech Specs 3.0.3 Entered on Three Occasions.Caused by Operator Error & Component Failure,Respectively.Personnel retrained.W/900511 Ltr | |
| ML20012D815 | 24 March 1990 | LER 90-003-00:on 900222 & 23,discovered That Stroke Time Measurements Not Performed in Both Directions for motor- Operated Valves in safety-related Sys.Caused by Program Deficiency.Procedural Enhancement implemented.W/900323 Ltr | Stroke time Enforcement Discretion |
| ML20011E186 | 2 February 1990 | LER 90-001-00:on 900107,reactor Scram Occurred After Improper Transfer of 480-volt Ac Power Supplies Resulted in Total Loss of Feedwater Flow & Power Interruption.Caused by Personnel Error.Operator Counseled & Instructions Revised | |
| ML20011E187 | 2 February 1990 | LER 90-002-00:on 900107,RCIC Sys Isolated Due to High Differential Temp Signal Detected Across RCIC Room Cooler Following Reactor Scram Due to Loss of Feedwater Flow. Caused by Design Deficiency.Procedures Re Flow Rate Revised | |
| ML19354E096 | 19 January 1990 | LER 89-032-00:on 891228 & 900105,HPCS Sys Declared Inoperable Due to Inoperability of Div 3 Battery.Caused by Low Pilot Cell Voltage,Cell W/Slow Electrolyte Leak & Blown Power Fuse.Fuse & Hydromotor Pump replaced.W/900119 Ltr | |
| ML20005E685 | 5 January 1990 | LER 89-031-00:on 891206,08 & 15,RWCU Sys Isolations Occurred.Caused by Design Deficiency & Deficiency in Leak Detection/Differential Flow Circuitry Setpoint &/Or Time Delay.Leak Detection Thermocouples relocated.W/900105 Ltr | |
| ML20005E082 | 26 December 1989 | LER 89-030-00:on 891125,plant Entered Tech Spec 3.0.3 Due to Two Untrippable Control Rods.Caused by Failure to Return Scram Pilot Valves Used for Rods to Mfg After Recall. Surveillance Instruction revised.W/891226 Ltr | Shutdown Margin Scram Discharge Volume |
| ML19354D599 | 17 December 1989 | LER 89-029-00:on 891117,heater Bay/Turbine Bldg Vent Gaseous Effluent Particulate & Iodine Samples Not Continuously Collected as Required by Tech Spec 3.3.7.10.Caused by Procedure Deficiency.Procedure revised.W/891217 Ltr | |
| ML19325E590 | 3 November 1989 | LER 89-028-00:on 891008,concluded That Operation of Fuel Pool Cooling & Cleanup Sys to Upper Containment Pools Caused Containment Vacuum Breaker Actuations.Caused by Unrecognized Sys Interaction.Operating Instruction revised.W/891103 Ltr | |
| ML19324B124 | 27 October 1989 | LER 89-024-01:on 890723,entry Into Operational Condition 2 Completed W/Suppression Pool Makeup Sys Inoperable & on 890725,vent Valve on Ref Leg Found Open & Uncapped.Caused by Personnel Error.Personnel counseled.W/891027 Ltr | |
| ML19325D512 | 20 October 1989 | LER 89-027-00:on 890925,loss of Control Power to Emergency Svc Water Sys Pump Discharge Valve a Rendered Sys Inoperable.Caused by Personnel Error Re Jumper Placement. Involved Technicians counseled.W/891020 Ltr | |
| ML19325D158 | 13 October 1989 | LER 88-025-01:on 880618,reactor Protection Sys (RPS) Bus Inadvertently Deenergized,Resulting in Full RPS Actuation. Caused by Personnel Error W/Contributing Factor of Poor Human Factors Design.Info Tag Installed on Power Switch | Overtravel |
| ML19325D159 | 13 October 1989 | LER 89-026-00:on 890913,reactor Thermal Power Level Exceeded That Specified in OL Due to Unexpected Recirculation Sys Flow Control Transient.Caused by Component Failure.Failed Isolation Solenoid Valve Replaced | |
| ML19325D933 | 27 March 1987 | LER 87-010-00:on 870228,operators Failed to Place at Least One Reactor Protection Sys Trip Sys in Tripped Condition within 1 H.Caused by Personnel Error & Deficient Procedure. Personnel Counseled & Procedures Revised | |
| ML19325C117 | 27 March 1987 | LER 87-009-00:on 870227,failure of Two Control Air Solenoid Valves Rendered Div I & II Diesel Generators Inoperable. Cause Unknown.Solenoid Valves Replaced & Plant Administrative Procedure PAP-1705 revised.W/870327 Ltr |