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| Issue date | Title | Topic | |
|---|---|---|---|
| ML20045A429 | 3 June 1993 | LER 93-003-00:on 930505,new Source of Natural Gas Introduced within 0.5 Miles of ISFSI & Reactor Bldg W/O Prior NRC Approval.Caused by Field Routing of Natural Gas Pipe.Well Isolated by Well operator.W/930603 Ltr | |
| ML20043E099 | 31 May 1990 | LER 89-018-01:on 890827,cracking Found in Incoloy Alloy 800 Main Steam Ringheaders & Condition Determined to Have Generic Implications.Caused by Creep Failure.Main Steam Ringheaders repaired.W/900531 Ltr | Safe Shutdown Liquid penetrant |
| ML20042G421 | 10 May 1990 | LER 90-001-00:on 900410,non-essential Bus 5,4160/480-volt Transformer N-9215 Experienced Fault.Caused by Breakdown of Insulation on Secondary Coils of Transformer.Coils of Transformer rewound.W/900510 Ltr | |
| ML20011D464 | 20 December 1989 | LER 89-014-01:on 890818,four Fire Barrier Penetration Seals in Bldg 10 Did Not Meet Foam Seal Structure Criteria of Seal Spec.Caused by Improper Curing During Installation.Fire Watch Established & Seals repaired.W/891220 Ltr | Safe Shutdown Fire Barrier Fire Watch |
| ML20024E002 | 29 July 1983 | LER 83-023/03L-0:on 830701 & 02,emergency Feedwater Unavailable to Drive Loop I Helium Circulation Water Turbines.Caused by Normal Wear of Valve PV-21243.Valve Internals Replaced & Valve calibr.W/830729 Ltr | |
| ML20024B986 | 1 July 1983 | LER 83-020/03L-0:on 830604,emergency Feedwater Header Supply to Loop I Helium Circulator Turbine Water Drive Isolated & Bearing Water Make Up Pump Taken Out of Svc.Caused by Flexitallic Gasket Failure Due to Normal wear.W/830701 Ltr | |
| ML20024A852 | 22 June 1983 | Updated LER 80-041/03X-2:on 800724,one of 12 Helium Circulator Seal Malfunction Pressure Differential Switches Discovered W/Trip Point Outside Tech Spec Limits.Caused by Dirt Accumulation in Electrical switches.W/830622 Ltr | |
| ML20023D902 | 26 May 1983 | LER 83-017/01T-0:on 830512,insp Performed Per IE Bulletin 83-03 Identified Six of Eight Check Valves Frozen in mid- Position.Caused by Corrosion & Rusting Valve Internal Parts. Valves Cleaned & Internal Components Replaced | |
| ML20028G283 | 28 January 1983 | LER 82-053/03L-0:on 821229,fuel Storage Well Pressure Exceeded Atmospheric Pressure While Reactor Was Shut Down. Caused by One Gas Compressor Being Out of Svc for Maint and Other Pumping Less than Capacity.Compressors Repaired | |
| ML20028G271 | 28 January 1983 | LER 82-054/03L-0:on 821229,outlet Temps Exceeded 120 F Limit When Reactor Became Critical During Isolation of Svc Water Flow to Pcrv Cooling Water Hx.Caused by Lack of Cooling Source.Design Change Initiated | |
| ML20028F240 | 19 January 1983 | LER 82-051/03L-0:on 821220,during Surveillance Test,One of Six Steam Pipe Rupture & One of 12 Steam Pipe Rupture Channels Identified Inoperable Due to Low Response to Calibr Noise.Caused by Failure of Resistor | |
| ML20028F288 | 17 January 1983 | LER 83-001/01T-0:on 830101 & 02,reactor Operated W/O Min Number of Operable Moisture Monitor Channels Required Per Table 4.4.1 of Limiting Conditions for Operation.Caused by Personnel Misinterpretation of Tech Specs | |
| ML20028A310 | 10 November 1982 | LER 82-042/03L-0:on 821013,unplanned Radioactive Gas Release Occurred W/Reactor Shutdown & Depressurized.Caused by High Airborne Activity in Reactor Bldg Due to Leaking Blank Flange.Emergency Procedures Initiated.Flange Repaired | |
| ML20028A286 | 10 November 1982 | LER 82-041/03L-0:on 821011,during Calibr of Radioactive Liquid Effluent Monitors,Trip Point for RIS-6212 Found to Be Less Conservative than Required.Caused by Instrument Drift. High Voltage & Discriminator Settings Adjusted | |
| ML20023A745 | 8 October 1982 | LER 82-036/03L-0:on 820908,one of Two Bearing Water Makeup Pumps Removed from Svc.Caused by Need to Rebuild Mechanical Seal Due to Normal Wear.Seal Rebuilt | |
| ML20052H988 | 12 May 1982 | LER 82-011/03L-0:during 820412-20,plant Operated in Degraded Mode of Limiting Conditions for Operation 4.2.11 Three Times & 4.2.10 Once.Caused by Offgas of Moisture from Core as Plant Returned to Power from Maint Outage | |
| ML20052H875 | 12 May 1982 | LER 82-013/03L-0:on 820412,separation in Axial Positions of Two Partially Inserted Control Rod Groups Fell Slightly Below Limit of 10 Ft.Cause Not Stated.Control Rods Repositioned | |
| ML20052G415 | 10 May 1982 | LER 82-012/03L-0:on 820410,at 10% Power,Instrument Air Compressor 1C Temporarily Taken Out of Svc to Repair after- Cooler Leak.Water Leak Caused by Normal Wear of after- Cooler.Air Compressor Returned to Svc After Repairs | |
| ML20052A333 | 27 April 1982 | LER 81-044 Has Been Cancelled | |
| ML20050B254 | 19 March 1982 | LER 82-006/03L-0:on 820218,primary Coolant Moisture Exceeded Tech Specs.Caused by Contamination W/Moisture During Maint Outage.Reactor Shutdown & Coolant Purification Trains Utilized to Reduce Impurity Levels | |
| ML20042B823 | 17 March 1982 | LER 82-005/03L-0:on 820215,loop 2 Steam Generator Penetration Rupture Disk 1 Leak Alarm Pressure Switch Found Isolated.Caused by Closed Pressure Switch Isolation Valve.Valve Opened | |
| ML20041F579 | 8 March 1982 | LER 82-007/01T-0:on 820222,control Rod Pairs for Regions 7 & 28 Did Not Insert Automatically Following Manual Scram. Possibly Caused by Binding or Sticking of Control Rod Drive Mechanism.Control Rods Exercised to Eliminate Sticking | |
| ML20041C323 | 19 February 1982 | LER 82-002/03L-0:on 820121,during Surveillance Testing, W/Reactor Shut Down,Three Loss of Bearing Water Pressure Differential Switches Found W/Setpoints Less Conservative than Required.Caused by Instrument Drift.Switches Recalibr | |
| ML20041C276 | 19 February 1982 | LER 82-003/03L-0:on 820122,one Drain Malfunction Pressure Differential Switch on 1C Helium Circulator Found Less Conservative than Tech Specs.Caused by Dirty Contacts. Contacts Cleaned & Switch Recalibr | |
| ML20041A989 | 16 February 1982 | LER 82-004/01T-0:on 820202,inadvertent Radioactive Liquid Waste Release Occurred from Receiver a During Plant Shutdown for Design Mods to Circulator Auxiliary Sys.Caused by Improper Valve Lineup.Event Reviewed W/Operators | |
| ML20040G951 | 5 February 1982 | LER 82-001/03L-0:on 820108,18 Snubbers Found Inoperable During Surveillance Testing,Indicating Inoperability During Reactor Operation.Caused by Seal Leakage & Deficiencies in Piston Position & Oil Level.Snubbers Repaired | |
| ML20040B808 | 13 January 1982 | LER 81-074/03L-0:on 811214,cold Reheat Snubber CRS-219 Found Detached from Pipe Mounting,Rendering Snubber Operable.Caused by Failure of Cotter Pin,Allowing Eyebolt to Be Displaced Out of Pipe & Snubber Rod Mounting | |
| ML20040B791 | 12 January 1982 | LER 81-075/03L-0:on 811221,two Sample Flow Circuits Found Out of Calibr During Annual Calibr of Primary Coolant Moisture Scram Instrumentation.Caused by Change in Instrument Characteristics.Procedures Being Revised | |
| ML20039F491 | 4 January 1982 | LER 81-073/03L-0:on 811208,one Helium Circulator Bearing Drain Pressure Low Switch Found to Have Trip Point Outside Required Limits.Caused by Dirt Accumulation in Electrical Switch That Impeded Contact | |
| ML20039C632 | 17 December 1981 | LER 81-072/03L-0:on 811117,PCRV Rupture Disk M-11701 Setpoint Exceeded Tech Specs Limits.Caused by Belleville Washer Operating Point Drift.Disks Under Evaluation | |
| ML20011A637 | 22 October 1981 | LER 81-060/03L-0:between 810922-1013,emergency Feedwater to Loop 1 Helium Circulator Water Turbine Drives Was Isolated on Three Occasions.Caused by Leakage Between Seat Ring & Valve Body Pressure Control Valve | |
| ML20010H913 | 11 September 1981 | LER 81-052/03L-0:on 810812,standby Bearing Water Makeup Pump Removed from Svc.Caused by Need to Repair Bonnet Leak in Valve in Suction Line to Pump.Pump Returned to Svc After Repair Completed | |
| ML20010J014 | 11 September 1981 | LER 81-050/03L-0:on 810814,total Dissolved Solids in Plant Nonradioactive Liquid Waste Effluent for 810809 Was Discovered to Have Exceeded Tech Specs.Caused by Improper Circulating Water Blowdown Arrangement.Blowdown Adjusted | |
| ML20010H882 | 4 September 1981 | LER 81-048/03L-0:on 810808 & 25 Loop 1 Prestressed Concrete Reactor Vessel Cooling Water Outlet Temp Exceeded 120 F Due to Failure of Temp Controller.Caused by Cold Solder Joint & Failure of Transistor in Output Circuit,Respectively | |
| ML20010H930 | 1 September 1981 | LER 81-049/03L-0:during 810802-07,increase Occurred in Offgassing from Core & Core Outlet Temps.Caused by Increased Primary Coolant Moisture & Oxidants from Refueling Shutdown | |
| ML20010G271 | 26 August 1981 | LER 81-046/03L-0:on 810728,emergency Feedwater Supply to Loop 1 Helium Circular Water Turbines Isolated to Repair Leaking 2-inch Consolidated Safety Relief Valves.Caused by Valve Leakage Downstream of Pressure Control Valve | |
| ML20010G169 | 26 August 1981 | LER 81-045/03L-0:on 810727,during Normal Startup Operation, Primary Coolant Dewpoint Exceeded Tech Spec Limits.Caused by Contamination Due to Moisture.Contaminants Removed from Primary Coolant | |
| ML20010G337 | 20 August 1981 | LER 81-051/03L-0:on 810721,Class I Snubbers Removed from Svc for Structural Mods W/Plant Operating at Power.Caused by Seismic Restraint Analysis Program.Snubbers Returned to Svc Following Mods | |
| ML20010G318 | 14 August 1981 | LER 81-043/03L-0:on 810717 & 0807,reactor Operated at Power W/One Class I Snubber Inoperable.Caused by Empty Oil Reservoirs on BFS-398E & MSS-149 Due to Leaking Fitting on Valve Block & Leaking Piston Seal.Fitting Tightened | |
| ML20010A160 | 16 July 1981 | LER 81-041/03L-0:on 810616,control Room Exhaust Damper Failed to Close.Caused by Dust Accumulation on Damper Vanes. Damper Operated Properly When Retested.Preventive Maint Program to Be Developed to Inspect & Clean Vanes | |
| ML20009E510 | 2 July 1981 | LER 81-039/03L-0:on 810602,following Routine Chlorination of Circulating Water Sys,Sample Indicated Excessive Residual Chlorine in Plant Liquid Effluent.Cause Unknown.Subsequent Chlorinations Showed No Abnormalities | |
| ML20009E558 | 2 July 1981 | LER 81-040/03L-0:between 810604 & 09,eight Hydraulic Shock Suppressors Were Found Out of Oil.Caused by Empty Hydraulic Oil Reservoirs Due to Leaking Seals & O-rings in Snubbers. Reservoirs Cleaned.Seals & O-rings Replaced | |
| ML20009E719 | 18 June 1981 | Revised LER 81-008/03X-1:on 810120,during Shutdown Maint & Primary Coolant Pressure Scram Calibr,Voltage Outputs of Pressure Transmitter Discovered High.Caused by Instrument Drift.Transmitter Calibr.Surveillance Test Completed | |
| ML20009E701 | 10 June 1981 | LER 81-035/03L-0:on 810511,w/plant at 70% Thermal Power During a Diesel Generator Set Surveillance Test,B Engine Tripped & Declutched.Caused by Failed Exhaust Temp Switch. Switch Repaired.Test Completed.Generator Returned to Svc | |
| ML20009A550 | 5 June 1981 | LER 81-038/03L-0:on 810507,two Class I Hydraulic Shock Suppressors Removed from Svc.Caused by Decision to Modify Suppressors to Original Configuration W/Zero Bleed Rate Block Valves | |
| ML20009A534 | 3 June 1981 | LER 81-034/03L-0:on 810504,equipment Necessary to Terminate Release from Liquid Waste Sys & Reactor Sump Found Not Operating Properly.Caused by Plugged Sense Lines on Flow Element Associated W/Control Valve | |
| ML20009A528 | 28 May 1981 | LER 81-032/03L-0:on 810428,hot Reheat Snubber HRS-244 Found Inoperable.Caused by Empty Hydraulic Oil Reservoir Due to Leaking Elbow Fitting.Fitting Tightened,Reservoir Refilled & Snubber Returned to Svc | |
| ML20004D578 | 27 May 1981 | LER 81-036/01T-0:on 810512,liquid Waste Discharge Exceeded Specified Limit for Tritium Concentration.Caused by Design Deficiency.Downstream of Valve HV 6212,150-200 Gallon Dead Leg Released Regardless of Dilution Flow Adequacy | |
| ML20004D717 | 27 May 1981 | LER 81-031/03L-0:on 810427,during Normal Surveillance Testing,Diesel Engine B Tripped & Declutched on Starting. Caused by Load Imbalance Between Engines a & B Due to Normal Wear of Linkage.Linkage Was Adjusted | |
| ML20004D666 | 27 May 1981 | LER 81-033/03L-0:on 810427,helium Circulator 1C Speed/Wobble Modifier Malfunctioned Causing Loss of Plant Protective Sys Functions to High Speed Trip Circuits.Caused by Electronic Circuit Unbalance.Spare Speed Element Installed |