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| Issue date | Title | Topic | |
|---|---|---|---|
| ML20045H241 | 9 July 1993 | LER 93-004-00:on 930611,while Performing EDG Operability Surveillance,Edg a Tripped Approx 3 After Initial Start Signal.Possibly Caused by Partially Latched Condition of Trip Mechanism.Latch Will Be reset.W/930709 Ltr | |
| ML20045D599 | 18 June 1993 | LER 93-003-00:on 930525,primary Containment Isolation Sys Half Group III Isolation Occurred Due to Loss of Jumper to Terminal Continuity During Planned Maint.Automatic Actions Confirmed & Signal Received verified.W/930618 Ltr | |
| ML20045D645 | 18 June 1993 | LER 92-013-01:on 920817,scram Setpoint Was Reduced Due to Induced Noise Signal Which Caused Automatic Scram to Occur. C/As:Installed Inductors in Affected Flow Transmitter circuits.W/930618 Ltr | Overtravel |
| ML20024B058 | 22 June 1983 | LER 83-017/03L-0:on 830523,while Operating in Torus Cooling Mode,Pressure Differential Across RHR Svc Water Strainer 1S-90B Increased.Caused by Sheared Motor Coupling Shear Pins.Two Shear Pins installed.W/830622 Ltr | |
| ML20024A461 | 10 June 1983 | LER 83-021/01T-0:on 830527,containment H202 Analyzer Channel a Rendered Inoperable.Caused by Calibr Difficulties Due to Fouled Pressure Regulators Resulting from Sys Contamination. Tech Specs revised.W/830610 Ltr | Post Accident Monitoring |
| ML20023D969 | 27 May 1983 | LER 83-014/03L-0:on 830428,relay B21-K2A Did Not Pick Up as Required on High Flow Signal.Caused by Sticking Plunger in Flow Meter & Faulty Capacitor in Flow Switch Circuit.Plunger Freed & Capacitor replaced.W/830527 Ltr | |
| ML20028A702 | 12 November 1982 | LER 82-071/03L-0:on 821024,suppression Pool Water Temp Recorder TR-4386B Found Inoperable.Caused by Random Failure of Pen 1 Motor.Motor Replaced & Recorder Returned to Svc | |
| ML20028A686 | 12 November 1982 | LER 82-074/03L-0:on 821101,control Rod Drive Scram Discharge Vol Valves V-18-07,V-18-08 & V-18-16 in Proper Position But Not Properly Locked.Caused by Lack of Procedural Guidance for Wrapping Locking Chain.Valves Locked | |
| ML20027B265 | 8 September 1982 | LER 82-051/03L-0:on 820809,reactor Core Isolation Cooling Steam Line High Pressure Differential Indicating Switch PDIS-2442 Tripped Out of Spec at 98 Inches of Water.Caused by Instrument Drift.Switch Recalibr & Tested | |
| ML20052H305 | 14 May 1982 | LER 82-030/03L-0:on 820421,HPCI Steam Supply Pressure Switch PS-2246A Setpoint Found Above Tech Spec Limit.Caused by Instrument Drift.Switch PS-2246A Recalibr & Tested | |
| ML20052H282 | 14 May 1982 | LER 82-029/03L-0:on 820419,during Normal Operation,Gate valve,MO-8401D,found to Have No Position Indication in Control Room & Could Not Be Operated from Control Room. Caused by Blown Control Fuse.Fuse Replaced | |
| ML20052G531 | 10 May 1982 | LER 82-028/03L-0:on 820410,during Cold Shutdown,While Removing Pipe Insulation to Access RHR Fill Line Valves for Maint,External Corrosion Found on RHR Fill Pump 1P-70 Min Flow Line.Caused by Moisture Retention by Pipe Insulation | |
| ML20052F028 | 5 May 1982 | LER 82-026/03L-0:on 820407,MSIV Leakage Control Sys (MSIV-LCS),pressure Switch PS-8404C Failed,Rendering Sys Inoperable.Caused by Corrosion on Terminal Strip.Terminal Strip Cleaned & Lubricated | |
| ML20052E928 | 4 May 1982 | LER 82-027/03L-0:on 820411 Drywell Pressure Switches PS-4310C & PS-4312C Tripped at 2.35 & 2.45 Psig, Respectively.Caused by Instrument Drift.Switches Recalibr & Tested | |
| ML20052E913 | 3 May 1982 | LER 82-025/03L-0:on 820404,suppression Chamber to Drywell Vacuum Breaker Valve CV-4327D Failed to Close Completely. Caused by Pneumatic Cylinder Piston Stuck in mid-position. Piston Lubed & Valve Tested Satisfactorily | |
| ML20052B441 | 23 April 1982 | Updated LER 81-030/03L-1:on 810701,during Surveillance Testing,Torus Atmosphere Sampling Line Isolation Valve SV-8108A Would Not Close.Caused by Rust in Mechanical Portion of Solenoid.Solenoid Dismantled & Cleaned | |
| ML20052B425 | 23 April 1982 | Updated LER 82-020/01X-2:on 820315,standby Diesel Generator 1G-21 Tripped During Surveillance Testing.Caused by Procedural Deficiency,Allowing Fuel Oil Filter Change W/O Filling & Venting Filter Casings.Maint Procedures Written | |
| ML20052B392 | 23 April 1982 | Updated LER 81-013/01T-1:on 810324,MSIVs 4412,4413,4416, 4419,4420 & 4421 Found to Have Seat Leakage on Inboard & Seat & Stem Leakage on Outboard Valves Exceeding Tech Specs. Caused by Normal Wear.Valves Repaired as Needed & Retested | |
| ML20052B379 | 23 April 1982 | Updated LER 80-054/01X-1:on 801110,during Plant Startup, Leaking Relief Valve PSV-4405 Stuck Open Causing Reactor Scram.Cause Unknown.Pilot Assembly Replaced | |
| ML20052B218 | 23 April 1982 | Updated LER 79-021/01X-1:on 790918,during Surveillance Testing Min Flow Valve (MOV 2009) for Rgr (LPCI) Pumps 1P-229A & 1P-229C Failed to Open.Caused by Stripped Operator Worm Gear.Worm,Gear,Quad Rings & O Rings Replaced | |
| ML20050D464 | 5 April 1982 | Updated LER 82-020/01T-1:on 820315,standby Diesel Generator Tripped in Start Sequence While Performing Surveillance Testing.Caused by Procedural Deficiency Allowing Both Fuel Oil Filters to Be Changed W/O Filing & Renting Casings | |
| ML20050D554 | 2 April 1982 | LER 82-022/03L-0:on 820305,HPCI Declared Inoperable When Preliminary Design Review Did Not Confirm Loose Mounting Plate on Spring Can Hanger EBB-14-H8.Caused by Degraded Condition of Red Head Concrete Expansion Bolts | |
| ML20050D512 | 1 April 1982 | LER 82-021/03L-0:on 820302,during Normal Operation Surveillance Testing on Standby Gas Treatment Sys Charcoal Deluge Sys,A Train Found to Be Wet.Caused by Leaking Deluge Valve CV-5837 & Plugged Orifice in Drainline | |
| ML20050C428 | 29 March 1982 | LER 82-020/01T-0:on 820315,during Normal Operation,While Performing Surveillance Testing,Standby Diesel Generator 1G21 Tripped in Start Sequence.Caused by Procedural Deficiency.Procedures Rewritten | |
| ML20050A940 | 26 March 1982 | LER 82-019/03L-0:on 820225,during Surveillance Testing on Main Steam Line Tunnel Leak Detection Sys,Temp Switch TIS-4444 Failed to Operate.Caused by Faulty Capacitor in Power Supply.Sys Tested & Restored to Svc | |
| ML20042C293 | 23 March 1982 | LER 82-018/03L-0:on 820221,during Normal Operation, Supression Pool Level Transmitter LT-4363B Responded Erratically,Trending Downscale.Caused by Interference by RHR Repairs.Transmitter Removed from Svc,Pending Repairs | |
| ML20042B259 | 19 March 1982 | LER 82-017/01T-0:on 820307,during Surveillance Testing, Standby Filter Unit a for Control Bldg Ventilation Sys Discovered to Have Low Halogenated Hydrocarbon Removal Efficiency.Caused by Moisture in Charcoal Adsorber Bank | |
| ML20042B341 | 19 March 1982 | LER 82-014/03L-0:on 820219,during Normal Operation,A RHR Loop Declared Inoperable Due to Failed Snubber GBB-4-SS-211 & Hanger GBB-4-H10.Caused by Minor Damage & Pipe Movement on a Rhr.Snubber Replaced & Hanger Repaired | Hydrostatic |
| ML20042B381 | 17 March 1982 | LER 82-016/03L-0:on 820215,control Bldg Ventilation Sys Exhaust Isolation Damper Failed to Close Completely.Caused by Corrosion of Damper Operator Cylinder Due to Humidity. New Actuator Will Be Installed.Humidity Problem Studied | |
| ML20042A578 | 11 March 1982 | LER 82-015/01T-0:on 820225,RHR Svc Water Valve MOV-1947 Failed to Close During Normal Operation.Caused by Wear of Valve Operator Stem Nut.Stem Nut MOV-1947 & Gaskets Replaced,Operator Lubricated & Limit Switches Reset | |
| ML20042A343 | 11 March 1982 | LER 82-013/01T-0:on 820220,RHR Sys B Snubber GBB-3-SS-235 Removed from Svc for Testing.Caused by Snubber Pipe Clamp Rotated Out of Position & Bent Snubber Extension.Pipe Clamp Repositioned,Extension Straightened & Snubber Replaced | |
| ML20041F218 | 5 March 1982 | LER 82-012/03L-0:on 820208,during Surveillance Testing,Msiv Leakage Control Sys Bypass Valve MOV-8403C Failed to Close. Caused by Failed Auxiliary Switch on Motor Starter Contractor Coil Mfg by Allis Chalmers.Switch Replaced | |
| ML20041F189 | 5 March 1982 | LER 82-010/03L-0:on 820206,oxygen Analyzer B for Containment Atmosphere Dilution Sys Found Reading Upscale.Probably Caused by Corrosion on Contacts Due to Bad Connection Between Oxygen Analyzer Cell & Terminal Strip | |
| ML20041F182 | 5 March 1982 | LER 82-011/03L-0:on 820208,self-cleaning Strainer IS-85B on Suction Line to Screen Wash Pump B for River Water Supply Sys Became Plugged.Caused by Failed Strainer Shear Pin. Strainer Cleared.Baskets,Cap,Gearbox & Shear Pin Replaced | |
| ML20041B881 | 19 February 1982 | LER 82-008/03L-0:on 820121,LPCI Sys & RHR Svc Water Sys a Declared Inoperable Due to Piping Stress in Excess of Code Allowables.Cause Unknown.Snubber GBC-1-SS-56 & RHR Sys Valve Replaced | Liquid penetrant |
| ML20041B745 | 19 February 1982 | LER 82-009/01T-0:on 820205,secondary Containment Integrity Violated by Inadvertently Opening Inner Railroad Airlock Personnel Door While Outer Reactor Bldg Door Was Open.Caused by Personnel Error W/Failed Solenoid Contributing | |
| ML20041B375 | 12 February 1982 | LER 82-005/03L-0:on 820114,torus Water Level Recorder Lr 4385 Found in Failed Downscale Condition.Caused by Excessive Heat Buildup in Recorder Cabinet Due to Poor Ventilation. Cabinet Being Kept Open Temporarily to Increase Cooling | |
| ML20041B238 | 12 February 1982 | LER 82-003/03L-0:on 820113,while Performing Surveillance Testing,Reactor Vessel Pressure Switch Ps 4529 Tripped Below Tech Spec Limit.Caused by Instrument Drift.Switch Recalibr | |
| ML20041B249 | 12 February 1982 | LER 82-006/03L-0:on 820114,B Oxygen Analyzer for Containment Atmosphere Dilution Sys Found Inoperable W/Low Flow on Span & Zero Gas.Caused by Defective Procedures.Bypass Flow Adjusted.Procedures Will Be Revised | |
| ML20041B254 | 12 February 1982 | LER 82-007/01T-0:on 820204,reactor Core Isolation Cooling Injection Valve MOV 2512 Was Opened & Then Would Not Close. Caused by Motor Operator Circuit Breaker Close Contractor Coil Being Opened.Coil Replaced | |
| ML20041B391 | 12 February 1982 | LER 82-004/03L-0:on 820115,drywell High Pressure Switch Ps 4315B Tripped out-of-spec.Caused by Instrument Drift. Switch Recalibr | |
| ML20041B405 | 11 February 1982 | LER 82-002/03L-0:on 820112,reactor Core Isolation Cooling Steam Line High Flow Pressure Differential Indicating Switches PDIS2441 & 2442 Tripped at 118 & 125 Inches of Water.Caused by Instrument Drift.Switches Recalibr | |
| ML20040G930 | 5 February 1982 | LER 82-001/03L-0:on 820108,subchannel B of Tis 4477 to Turbine Bldg Main Steam Line Leak Detection Sys Found W/ Nonconservative Trip Setting Greater than Tech Spec Limit. Caused by Instrument Drift.Tis 4477 Recalibr & Tested | |
| ML20040D454 | 22 January 1982 | LER 81-048/03L-0:on 811223,pressure Differential Switch Which Controls Reactor Bldg to Suppression Chamber Vacuum Breaker Cv 4305 Tripped at Out of Tech Spec Value.Caused by Instrument Drift.Switch Recalibr & Functionally Tested | |
| ML20039G057 | 6 January 1982 | LER 81-049/03L-0:on 811208,both Torus Level Indications Momentarily Out of Svc.Caused by Failure of Technicians to Obtain Shift Supervisor Authorization Prior to Starting Calibr Test.Instrument Calibr & Employee to Be Disciplined | Hydrostatic |
| ML20039D503 | 22 December 1981 | LER 81-046/03L-0:on 811201,control Bldg Ventilation Sys Exhaust Isolation Damper Failed to Close Rendering a Control Room Standby Filter Unit Inoperable.Caused by Misalignment of Damper Operator.Repair Procedure to Be Corrected | |
| ML20039D453 | 22 December 1981 | LER 81-044/03L-0:on 811124,secondary Containment Isolation Damper on Air Ejector Room Exhaust Duct to Offgas Stack Failed to Close Completely When Operating Air Secured to Protect Damper.Cause Unknown.Investigation Continuing | |
| ML20039D446 | 22 December 1981 | LER 81-045/03L-0:on 811124,control Bldg Ventilation Sys Exhaust Damper Failed to Close,Rendering a Control Room Standby Filter Unit Inoperable.Caused by Misalignment Between Do & Damper Shafts Due to Repair Procedure Defect | |
| ML20039D433 | 22 December 1981 | LER 81-047/03L-0:on 811204,high Drywell Pressure Switch PS-4311B Trip Setpoint Found to Be Out of Tolerance.Caused by Instrument Drift.Switch Recalibr (Static-O-Ring Model 12N-AA5) | |
| ML20039C957 | 22 December 1981 | LER 81-043/01T-0:on 811208,negative 24-volt de-charger Was Putting Out Only 21 Volts.Cause Undetermined.During Trouble Shooting,Charger Resumed Normal Output |