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| Issue date | Title | Topic | |
|---|---|---|---|
| ML18040A349 | 2 July 1998 | LER 98-017-00:on 980602,control Room Ventilation Sys Was Declared Inoperable.Caused by Original Design Deficiency. Mod Designed,Tested & Implemented Prior to Startup from RF06 to Correct Design deficiency.W/980702 Ltr | Time of Discovery |
| ML17059C101 | 24 June 1998 | LER 98-014-00:on 980525,noted Differences Between Actual Valve Weights & Weights Shown on Engineering Drawings.Caused by Vendor Failing to Provide Accurate Valve Weights.Revised Valve Drawings & Associated Calculation,Per 10CFR21 | Time of Discovery |
| ML18040A345 | 4 June 1998 | LER 98-004-01:on 980302,TS Required LSFT of Level 8 Trip of Main Turbine Was Missed.Caused by Knowledge Deficiency of EHC Sys.Revised Applicable LSFT Procedures Prior to Refueling Outage 6.W/980604 Ltr | |
| ML18040A285 | 8 December 1993 | LER 93-010-00:on 931108,HPCS Was Inoperable Due to Equipment Deficiency,Inadequate Managerial Methods & Poor Work Practices.Replaced Deficient Contactors & Restored Tap Setting.Also Reportable Per Part 21.W/931208 Ltr | Safe Shutdown Probabilistic Risk Assessment Earthquake Fuel cladding |
| ML18038A319 | 10 August 1990 | LER 90-006-00:on 891027,discovered Unverified Assumption in App R Safe Shutdown Analysis.Caused by Fire Protection Program Failure to Provide Detailed Procedural Instructions for Operator Actions.New Procedures developed.W/900810 Ltr | Safe Shutdown Fire Protection Program |
| ML18038A470 | 15 May 1989 | LER 89-014-00:on 890413,unit Reactor Experienced Reactor Scram Which Was Result of Turbine Trip Due to Actuation of Generator Protection Circuitry.Turbine Trip Caused by Disconnected Wire.Wire relanded.W/890515 Ltr | Safe Shutdown Unanalyzed Condition Boric Acid Reactor Vessel Water Level Emergency Lighting |
| ML18038A413 | 22 August 1988 | LER 88-051-01:on 870813,shutdown Cooling Sys Isolated & Tech Specs 3.4.9.2 Exceeded.Caused by Equipment Failure,Personnel Error & Procedural & Design Deficiencies.Shutdown Cooling Sys Manually restored.W/880822 Ltr | Half scram |
| ML18038A405 | 1 July 1988 | LER 88-024-00:on 880605,ESF Actuation Occurred Due to Resetting of Failed Radiation Monitor Microcomputer.Caused by Lack of Personnel Training.Defective Cards & Modules in RE14B Microcomputer & DRMS Panel replaced.W/880701 Ltr | |
| ML18038A390 | 12 April 1988 | LER 88-014-00:on 880313,reactor Scram & ESF Actuations Occurred.Caused by Equipment Failure Due to Design Deficiency.Transmitter Replaced W/Upgraded Model & Temporary Mod Performed to Bypass Logic for valves.W/880412 Ltr | Temporary Modification Scram Discharge Volume |
| ML18038A389 | 17 February 1988 | LER 88-001-00:on 880120,reactor Scram Occurred Due to Actual Low Water Level Condition.Caused by Design & Personnel Errors.Operator Disciplined & Mod Addressed Inadvertent Feedwater Control Valve lockup.W/880217 Ltr | Safe Shutdown |
| ML18038A759 | 22 December 1987 | LER 87-023-00:on 870422,trip of Normal Reactor Bldg Ventilation & Initiation of Emergency Ventilation Occurred. Caused by Personnel Error.Fuse Replaced.On 871123,util Discovered LER Not Submitted for event.W/871222 Ltr | |
| ML18038A258 | 15 June 1987 | LER 87-025-00:on 870519,secondary Containment Isolation Signal Generated Due to Technician Relanding Lifted Lead Prematurely.Caused by Breakdown in Communications.Gaitronics Phone &/Or Headset Jack installed.W/870615 Ltr | |
| ML18004C006 | 13 April 1987 | LER 86-002-01:on 861104,procedure N2-OSP-RMC-W0002 Ran for Over 2 H Thereby Violating Tech Specs.Caused by Personnel Error & Procedure Deficiency.Temporary Change Notice Issued to procedure.W/870413 Ltr | |
| ML20024E833 | 16 August 1983 | LER 83-021/03L-0:on 830720,22,26 & 28,emergency Cooling Sys Loop 11 Taken Out of Svc for Periods Up to 5 H.Caused by Attempt to Reseat Isolation Valve 39-05.Valve Seat Lapped & Loop Returned to svc.W/830819 Ltr | |
| ML20024E634 | 2 August 1983 | LER 83-017/03L-0:on 830707,HPCI Feedwater Booster Pumps 11 & 13 Taken Out to Svc to Inspect Impellers Due to Similar Problem on nonsafety-related Pump.Parts of Strainer Found in Pumps But Pumps undamaged.W/830805 Ltr | |
| ML20024E025 | 22 July 1983 | LER 83-019/03L-0:on 830623,two Monthly Surveillance Tests on Inadequate Core cooling-accident Level Monitor Missed Following 811231 Installation.Surveillance Procedures Generated & Added to schedule.W/830725 Ltr | |
| ML20024B771 | 17 June 1983 | LER 83-010/03L-0:on 830524,core Topping Pump 121 Removed from Svc to Replace Packing.Caused by Air Leaking Due to Iltr Pressure Introduction in Pump.Packing Replaced & Pump Returned to Svc within 22 h.W/830621 Ltr | |
| ML19277C588 | 16 June 1983 | LER 83-013/03L-0:on 830610,during Routine Surveillance,Lock Found Missing from Outside Inlet Valve 40-12 for Core Spray Sys.Valve & Breaker in Open Position.Lock Missing for No More than 15 Days.Lock replaced.W/830708 Ltr | |
| ML20024B710 | 16 June 1983 | LER 83-011/03L-0:on 830604,electromatic Relief Valve 121 Failed to Open.Caused by Dirty Pilot Due to Oxide Buildup During Extended Outage.Pilot Cleaned & Retested & Normal Shutdown initiated.W/830628 Ltr | |
| ML20023D957 | 24 May 1983 | LER 83-009/03L-0:on 830426,control Room Ventilation Sys Removed from Svc for Mods to Control Room Wall,Per LER 83-06.Temporary Flexible Ducting in Place During Mods. Mods Completed.Ventilation Sys Returned to svc.W/830526 Ltr | |
| ML20023D255 | 11 May 1983 | LER 83-006/03L-0:on 830411,while Performing Design Review, Discovered That Poured Concrete North & West Walls of Control Room Would Not Meet Original Seismic Criteria. Mods Made to Improve Wall Structural Loading Capabilities | |
| ML20023B832 | 18 April 1983 | LER 81-053/03L-1:on 811120,discovered That Single Failure of Electrical Power Supply Could Either Isolate Both Condenser Sys or Cause Failure to Isolate.Logic for Initiation & Isolation of Condenser Sys Reviewed | |
| ML20028C839 | 5 January 1983 | LER 82-018/03L-0:on 821207,during Maint Outage,Leakage from Valves 68-05 & 68-08 Found Exceeding Tech Specs.Caused by Poor Seal Design.Mods Will Be Completed During Current Outage & Followed by Retest | |
| ML20028C836 | 5 January 1983 | LER 82-017/03L-0:on 821206,during Maint Outage,Leakage from Valves 68-06 & 68-09 Found Exceeding Tech Specs.Caused by Poor Seal Design.Mods Will Be Completed During Current Outage & Followed by Retest | |
| ML20027C968 | 19 October 1982 | LER 82-001 Has Been Canceled | |
| ML17341B665 | 5 August 1982 | LER 82-011/03L-0:on 820802,oil Leak on Fuel Oil Supply Manifold Discovered on Diesel Fire Pump.Caused by Defective Braze Joint.Leak Repaired by Manufacturer | |
| ML20050N669 | 5 April 1982 | LER 82-009/01T-0:on 820323,while Conducting Routine Reactor Vessel Hydrostatic Testing Prior to Startup,Water Observed Leaking from Insulation on Recirculation Piping.Cause Being Investigated | Hydrostatic |
| ML20050C388 | 29 March 1982 | LER 82-008/01T-0:on 820317,review of Surveillance Test N1-ST-R7 Revealed Potential for Reactor Steam to Leak to Atmosphere from Emergency Condenser Vents.Caused by Potential Sys Leaks.Sys Modified Per NUREG-0737 Item II.B.1 | |
| ML20052F899 | 24 March 1982 | LER 82-009:on 820323,during Routine Reactor Vessel Hydrostatic Testing Prior to Startup,Water Observed Leaking from Insulation on 11 Recirculation Piping Suction from Reactor Vessel.Cause Under Investigation | Hydrostatic |
| ML20042C504 | 23 March 1982 | LER 82-006/04L-0:on 820225,during Normal Operation,While Tempering Plant Inlet Canal,Plant Discharge Temp Exceeded 85 F.Caused by Increase in Lake Temp Due to Weather Conditions & Inability to Fully Lower Tempering Gate | |
| ML20052F846 | 18 March 1982 | LER 82-008:on 820317,discovered Potential Path for Reactor Steam from Emergency Condenser Steam Line Vents to Atmosphere If Emergency Condenser Tube Leaks Occur.Caused by Mods Made to Comply w/NUREG-0737,Item II.B.1 | |
| ML20042A689 | 12 March 1982 | LER 82-007/04L-0:on 820222,while Reviewing Environ Radiation Fish Analysis Sample Data,Lower Limit of Detection Sensitivity Was Determined Not Met for Nov 1981.Cause Not Stated.Tech Spec Proposal Being Submitted to Update Stds | |
| ML20049H610 | 19 February 1982 | LER 82-005/03L-0:on 820208,115 Kv Line Taken Out of Svc for Maint,Placing Plant in Limited Condition of Operation.Maint on Line Required Due to Open Loop.Line Repaired & Returned to Svc | |
| ML20041C165 | 19 February 1982 | LER 82-004/01T-0:on 820207,during Routine 115-KV Breaker Exercising,Ground Directional Relay Caused Opening of Breaker Alternate 115-KV.Caused by Momentary Loss Offsite Power.Power Restored After Closing Oswego-NMP1 Breaker | |
| ML20041C117 | 17 February 1982 | LER 82-003/01T-0:on 820204,at 100% Power,Reactor Bldg Ventilation Sys Isolated & Emergency Ventilation Sys Initiated Due to Radioactive Release.Caused by Overflow of Reactor Water Cleanup Sys Filter Sludge Tank | |
| ML20041A751 | 10 February 1982 | LER 82-002/01T-0:on 820129,NRC Inspector Discovered That Primary Containment Following DBA LOCA May Not Be Vented Using Operating Procedure Due to Inaccessibility of Reactor Bldg.Combustible Gas Control Sys Will Be Installed | |
| ML20052F896 | 8 February 1982 | LER 82-004:on 820207,during Steady State Operation,Momentary Loss of 115 Kv Offsite Power Caused Emergency Diesel Generators to auto-start on Low Voltage to Power Boards 102 & 103 | |
| ML20052F898 | 5 February 1982 | LER 82-003:on 820204,during Steady State Operation,Cleanup Sludge Tank Vent Overflowed Into Reactor Bldg Exhaust Ventilation Sys Causing Emergency Ventilation Sys to Initiate.Cause Not Stated.Decontamination in Progress | |
| ML20052F893 | 1 February 1982 | LER 82-002:on 820129,during Steady State Power,Upon Review by Resident Inspector,Discovered That Operating Procedure Describing Steps to Vent Primary Containment Following DBA LOCA Required Personnel to Enter Reactor Bldg | |
| ML20040B862 | 18 January 1982 | LER 81-054/03L-0:on 811221,insertion of Shallow Control Rods Resulted in Average Planar Linear Heat Generation Rate in Excess of Tech Spec Limits.Caused by Flux Coupling Between Control Rods.Extra Rods Inserted & Tech Specs Modified | |
| ML20039E295 | 2 January 1982 | LER 81-025,is Cancelled | |
| ML20039C095 | 14 December 1981 | LER 81-053/03L-0:on 811120,emergency Condensers 11 & 12 Were Isolated When Emergency Condenser Vent Radiation Monitor de-energized Due to Loss of Dc Motor Speed Control.Caused by Defective Silicon Controlled Rectifier.Rectifier Replaced | |
| ML20038B497 | 25 November 1981 | LER 81-008/01X-1:on 810316,ultrasonic Testing Revealed Indication on Southeast Reactor Feedwater Nozzle Inside Bore.Caused by Inadequate Investigation.Dye Penetrant & Surface Exam Revealed Indication Nonreportable | |
| ML20038B456 | 25 November 1981 | LER 81-050/03L-0:on 810715,reactor Bldg Ventilation Duct Radiation Monitor Showed Abnormal Spiking Which Initiated Emergency Ventilation Sys.Caused by Malfunctioning sensor-convertor Unit.Unit Replaced & Calibr | |
| ML20038B880 | 24 November 1981 | LER 81-052/03L-0:on 810812,failure of One Reactor Vessel Electromatic Relief Valve Thermocouple & Two Reactor Vessel Head Safety Valve Thermocouples Noted in Testing.Cause to Be Investigated Given Drywell Access in Next Cold Shutdown | |
| ML20038B770 | 24 November 1981 | LER 81-049/03L-0:on 811112,during Normal Operation,Feedwater Hydraulic Snubber 29-HS-6 Taken Out of Svc for Preventative Maint Because of Small Oil Leak.Cause Not Stated.Snubber Rebuilt & Returned to Svc | |
| ML20038B458 | 20 November 1981 | LER 81-051/04L-0:on 811109,while Reviewing Environ Radiation Fish Analysis Sample Data,Lower Limit of Detection Sensitivity (LLD) Not Met.Caused by Higher LLD Values When Test Data Converted from Wet to Dry Weight Units | |
| ML20011A485 | 30 September 1981 | LER 81-046/04T-0:on 810922,review of 810813 & 14 ETS Semiannual Samples of Cladophora Showed Co-60 & Nb-95 at Level of 10 Times Control Value.Probably Caused by Liquid Effluent Discharge & Oct 1980 Chinese Weapons Test | |
| ML20010G693 | 10 September 1981 | LER 81-042/04T-0:on 810831,during Weekly Environ Radiation Monitor Insp,Only Six Monitors Found Functioning Due to Defective Power Supply Units.Cause Unknown.Portable Monitor Installed | |
| ML20010G434 | 4 September 1981 | LER 81-040/03L-0:on 810818,chromated Water Found in Diesel Generator 102 Raw Water Due to Water Leaking Through Heat Exchangers.Cause Unknown.Raw Water Lines Drained & All Chromate Recovered |