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Issue date | Title | Topic | |
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05000315/LER-1981-002, Updated LER 81-002/03X-1:on 810215,west Motor Driven Auxiliary Feed Pump Removed from Svc to Repair Emergency Leakoff Line Check Valve FW-160.Caused by Dirt in Valve Causing Valve to Stick.Valve Cleaned & Returned to Svc | 3 June 1982 | Updated LER 81-002/03X-1:on 810215,west Motor Driven Auxiliary Feed Pump Removed from Svc to Repair Emergency Leakoff Line Check Valve FW-160.Caused by Dirt in Valve Causing Valve to Stick.Valve Cleaned & Returned to Svc | |
05000315/LER-1982-003, Corrected LER 82-003/04T-1:on 820115,unplanned Gas Release Detected by Elevated Vent Stack Monitor Reading.Exact Cause Undetermined.Helium Leak Testing of Waste Gas Sys Probable Cause.Test Procedure Changed | 3 May 1985 | Corrected LER 82-003/04T-1:on 820115,unplanned Gas Release Detected by Elevated Vent Stack Monitor Reading.Exact Cause Undetermined.Helium Leak Testing of Waste Gas Sys Probable Cause.Test Procedure Changed | |
05000315/LER-1982-028 | 27 May 1982 | LER 82-028/03L-0:on 820429,during Power Ascension Loop,One Wide Range RCS Pressure indication,NPS-122,failed High. Replacement Read Low on 820523.Caused by Open Stain Gauge & Faulty Calibr,Respectively | |
05000315/LER-1982-029 | 27 May 1982 | LER 82-029/03L-0:on 820503,during Surveillance Test,Low Pressure Alarm XPA-152 for Emergency Air Supply to NRV-152 Actuated at Less than 900 Psig.Caused by Faulty Calibr. Setpoint Increased | |
05000315/LER-1982-031 | 3 June 1982 | LER 82-031/03L-0:on 820510,operator on Tour Discovered That Fire Door 227 Would Not Latch.Caused by Slight Misalignment Between Latch & Latch Plate.Latch Plate Adjusted & Door Operated Satisfactorily | Fire Barrier |
05000315/LER-1982-032 | 3 June 1982 | LER 82-032/03L-0:on 820518,fire Hose Station 33 Near Emergency Diesel Generator Rooms Access Removed from Svc to Replace Leaking Drain Valve.Seat Leakage Caused by Normal Wear.Drain Valve Replaced | |
05000315/LER-1982-033 | 3 June 1982 | LER 82-033/03L-0:on 820510,operator on Tour Discovered That Fire Door 226 Would Not Fully Close.Caused by Insufficient Closure Mechanism Against Flow of Thermostatically Controlled Ventilation Supply Fan.Addl Mechanism Added | Fire Barrier |
05000315/LER-1982-034 | 4 June 1982 | LER 82-034/03L-0:on 820508,operator Discovered Safety Stop Pin in Track of Pressurizer Heaters Transformer Room Overhead Door.Caused by Pin Not Being Removed Upon Exit by Unknown Personnel.Pin Immediately Removed | Fire Barrier |
05000315/LER-1982-035 | 4 June 1982 | LER 82-035/03L-0:on 820507 & 10,fire Detector 1-HV Acrf Charcoal Filter Instrumentation Declared Inoperable to Troubleshoot & Repair Automatic Reset Function on Fire Detection Actuation Sys.Caused by Defective Transistor | Fire Watch |
05000315/LER-1982-041 | 18 June 1982 | LER 82-041/03L-0:on 820520,during Normal Startup,Feedwater Isolation Valve FMO-202 Failed While Being Utilized to Regulate Feedwater Flow.Caused by Heat Buildup Due to Frequent Cycling.Stem Nut & Motor Replaced | |
05000315/LER-1982-042 | 18 June 1982 | LER 82-042/03L-0:on 820524,during Operation,Containment Air Particulate Radiation Monitoring Sys (R-11) Found Operating Erratically.Caused by High Ac Ripple on Low Voltage Dc Power Sys.Low Voltage Dc Power Sys Replaced | |
05000315/LER-1982-044 | 23 June 1982 | LER 82-044/03L-0:on 820526,security Personnel Discovered AB Emergency Diesel Generator Carbon Dioxide Sys Isolated,No Names on Entry Board & No Personnel in Room.Caused by Personnel Error.Administrative Action Taken | Fire Watch |
05000315/LER-1982-045 | 23 June 1982 | LER 82-045/03L-0:on 820528,security Officer Discovered Low Pressure Carbon Dioxide Sys for Auxiliary Cable Vault Isolated W/O Personnel on Duty.Caused by Personnel Error. Need for Full Compliance W/Fire Protection Emphasized | |
05000315/LER-1982-061, Updated LER 82-061/03X-1:on 820726,discovered That Alarm/ Trip Setpoint Values in Newly Installed Containment Air Gaseous & Particulate Monitors Higher than Tech Specs.Caused by Personnel Error.Procedure revised.W/840313 Ltr | 13 March 1984 | Updated LER 82-061/03X-1:on 820726,discovered That Alarm/ Trip Setpoint Values in Newly Installed Containment Air Gaseous & Particulate Monitors Higher than Tech Specs.Caused by Personnel Error.Procedure revised.W/840313 Ltr | |
05000316/LER-1982-020, Updated LER 82-020/04T-0:on 820401,unplanned Gas Release Detected by Elevated Vent Stack Gaseous Monitor (R-26) Reading.Caused by Small Leak from Seal on East Centrifugal Charging Pump.Coolant Filter Changed | 13 April 1982 | Updated LER 82-020/04T-0:on 820401,unplanned Gas Release Detected by Elevated Vent Stack Gaseous Monitor (R-26) Reading.Caused by Small Leak from Seal on East Centrifugal Charging Pump.Coolant Filter Changed | |
05000316/LER-1982-044 | 11 June 1982 | LER 82-044/03L-0:on 820512,during Surveillance Testing,Loss of Bistable FB-445A Setpoint for Loop 4 Reactor Coolant Detected.Caused by Instrument Setpoint Drift.Model 63U-AC-OHAAF Replaced,Calibr & Returned to Svc | |
05000316/LER-1982-045 | 11 June 1982 | LER 82-045/03L-0:on 820513,during Normal Operation,Operator Noted Fire Door 461 Would Not Latch Properly Due to Loose Latch Cover.Caused by Screws Used to Secure Cover in Place Falling Out.New Screws Installed | Fire Barrier Fire Watch |
05000316/LER-1983-081, Updated LER 83-081/03X-1:on 830822 & 25,during Normal Operation,Reactor Trips Occurred as Result of Failures of 120-volt Ac Vital Bus Inverter.Caused by Operating Temps Above Rated Design Temps.Forced Air Cooling Installed | 18 January 1984 | Updated LER 83-081/03X-1:on 830822 & 25,during Normal Operation,Reactor Trips Occurred as Result of Failures of 120-volt Ac Vital Bus Inverter.Caused by Operating Temps Above Rated Design Temps.Forced Air Cooling Installed | |
05000316/LER-1984-003, Updated LER 84-003-01:on 840311 & 17,upper Containment Area Radiation Monitor VRS-2201(IL) Received High Alarm.Caused by Equipment Malfunction Due to Software Problems.New Software Installed | 16 July 1984 | Updated LER 84-003-01:on 840311 & 17,upper Containment Area Radiation Monitor VRS-2201(IL) Received High Alarm.Caused by Equipment Malfunction Due to Software Problems.New Software Installed | |
05000316/LER-1984-008, Updated LER 84-008-01:on 840419 & 24,containment Purge Isolated Due to Radiation Monitor High Alarms on Containment Area Radiation Monitor Train A.Caused by Software Error. Resolution Under Evaluation by Manufacturer | 31 May 1984 | Updated LER 84-008-01:on 840419 & 24,containment Purge Isolated Due to Radiation Monitor High Alarms on Containment Area Radiation Monitor Train A.Caused by Software Error. Resolution Under Evaluation by Manufacturer | |
05000316/LER-1985-043, Resubmitted LER 85-043-00:on 851227,auxiliary Bldg Ventilation Grab Sample Not Obtained within Tech Spec Time Constraints.Caused by Personnel Error.Administrative Action Taken W/Individual Involved | 20 March 1986 | Resubmitted LER 85-043-00:on 851227,auxiliary Bldg Ventilation Grab Sample Not Obtained within Tech Spec Time Constraints.Caused by Personnel Error.Administrative Action Taken W/Individual Involved | Grab sample |
IR 05000315/1989005 | 9 June 1989 | Advises That Failure of Component Cooling Water Containment Isolation Valve 1-CCM-458 to Close Not Reportable Per 10CFR50.73.LER 50-315/89-05 Retracted & LER Number Will Not Be Reissued | Time of Discovery |
ML17265A823 | 24 May 1999 | LER 98-037-01:on 990422,determined That Ice Condenser Bypass Leakage Exceeds Design Basis Limit.Caused by Pressure Seal Required by Revised W Design Not Incorporated Into Aep Design.Numerous Matl Condition Walkdowns & Assessments Made | Unanalyzed Condition |
ML17317A651 | 3 October 1978 | LER#78-053/03L-0 on 780907:containment Atmosphere Gaseous & Particulate Monitoring Pump Discovered Inoperable.Failure Attributed to Obsolesence.Pump Replaced W/Improved Model W/ Longer Operational Expectancy | |
ML17317A658 | 11 October 1978 | LER 78-069/03L-0:on 780913,while Performing Surveillance on Pressurizer Protection Sys,Reactor Trip Bistable Failed to Trip on Simulated High Pressure Signal.Bistable Replaced | |
ML17317A659 | 11 October 1978 | LER 78-070/03L-0:on 780911,air Start Line on Diesel 2AB Found to Be Hot During Load Test.Caused by Loose Piston Bolt Letting Combustion Vapors in Air Starting Line.Check Valve Replaced & Engine Retested Satisfactorily | Offsite Circuit |
ML17317A665 | 3 October 1978 | Monthly Operating Rept for Sept 1978 | Boric Acid |
ML17317A669 | 18 October 1978 | LER 78-072/03L-0:on 780926,during Rapid Load Reduction from 100% to 20% Power,Pressurizer Pressure Reduced Below Tech Spec Limit.Caused by Rapid Power Reduction | |
ML17317A670 | 18 October 1978 | LER 78-063/03L-1:on 780820,while Closing Turbine Valves at 99% Power,Steam Flow Reduced,Causing Reactor Coolant Temp to Increase & Power to Decrease.Caused by Testing Valves at Too High Power Level | |
ML17317A678 | 20 October 1978 | LER#78-056/03L on 780923: After Shutdown Boron Concentration Was 1940 Ppm,Which Is Below Limit Due to Reduction of Boron Level After Sampling at 1% Accumulator Vol Increase.Admin Procedure Was Rev to Req Level & Boron Verification | |
ML17317A688 | 20 October 1978 | LER 78-074/03L-0:on 780921,bistables Returned to Normal from Trip Position W/O Dynamics of lead-lag Portion of Unit Being Calibr.Caused by Improper Communications | |
ML17317A705 | 30 October 1978 | on 781030,deluge Valves Isolated to Facilitate Drumming Room & New Fuel Receiving Area as Result of Repair on Fire Sys Headers.Followup Rept Will Be Issued on 781110 | |
ML17317A715 | 1 November 1978 | LER#78-076/03L-0 on 781003:surveillance Tests on train-B of Solid St Protec Sys Showed That Several Switch Positions Were Bad.Caused by Bad Universal Logic Card.Card Replaced & Sys Returned to Svc | |
ML17317A716 | 1 November 1978 | LER#78-077/03L-0 on 781005:main Turbine Stop Valves C & D Closure Limit Switches Found Inoperable.Caused by Excessive Vibration of Stop Valves Due to Poor Design | |
ML17317A733 | 8 November 1978 | LER#78-034/03X-2 on 780515:hydrogen Skimmer Recirculation Fans Starting Times Were Found to Be 10 minutes,6 Seconds for 2HV-CEQ2 & 10 minutes,5 Seconds for 2-HV-CEQ1.One Minute TS Tolerance for Unit 2 & Agastats Are of 0-60 Minute Range | |
ML17317A734 | 8 November 1978 | LER 78-034/03l-0:on 781010,manual Isolation Valve in Flow Test Circuit of Turbine Driven Aux Feed Pump Found Unlocked & Open.Instructions Issued to Keep a Manual Valve in Test Line Closed & Locked Except When Testing | |
ML17317A735 | 8 November 1978 | LER 78-079/03L-0:on 781019,engine Failed to Start While Attempting to Prove Operability of 2AB Emergency Diesel in Order to Remove 2CD Diesel from Svc.Cause for Apparent Lack of Fuel Could Not Be Determined | |
ML17317A740 | 15 November 1978 | LER#78-060/03L-0 on 781028:RCS Leak Discovered Due to Excessive Packing on a 314 Valve in Pzr Safety Valve Loop Seal Drain Line.Valve Found to Be 1/8 Turn Open.Valve Closed and Leakage Stopped | Loop seal |
ML17317A743 | 1 November 1978 | Monthly Oper Rept for Oct 1978 | Boric Acid Loop seal Packing leak |
ML17317A747 | 1 November 1978 | Monthly Oper Rept for Oct 1978 | |
ML17317A765 | 22 November 1978 | LER#78-080/03L-0 on 781024:during Test of Solid St Protec Sys,Train A,3 Logic Test Positions Tested Unsatisfactorily. Caused by Failure of a Universal Logic Card & a Test Card. Both Subsequently Replaced | |
ML17317A766 | 22 November 1978 | LER#78-081/03L-0 on 781023:boron Injection Tank Boron Concentration Found to Exceed Tech Spec Limit.Caused by Either Lack of Effective Mixing from a Previous Boric Acid Solution Addition or by Faulty Sampling Methods | Boric Acid |
ML17317A767 | 22 November 1978 | LER#78-082/03L-0 on 781025:during Leak Rate Test on the 650 Foot Elevation Airlock Doors,Noted That Leakage Rate Exceeded Acceptable Limits.Caused by Inadequate Seal of Outer Door.Switch Indicator Subsequently Readjusted | |
ML17317A768 | 22 November 1978 | LER#78-083/03L-0 on 781023:noted That Cycling Times for Valve Operability Test After Maintenance Not Recorded When Valves Stroked.Caused by Defective Document Control for Issuing Changes to Instructions | |
ML17317A777 | 1 December 1978 | LER#78-085/03L-0 on 781106:during Routine Surveillance Test Turbine Driven Auxiliary Feedwater Pump Did Not Start.Caused by Zener Diode Which Had Shorted at Electronic Overspeed Monitor,Resulting in Constant Overspeed Trip Signal | |
ML17317A782 | 1 December 1978 | LER#78-061/03L-0 on 780823:discovered That During Past Surveillance Testing,Allowable Surveillance Extension Had Been Exceeded for Target Flux Difference Surveillance Test. Caused by Personnel Error | |
ML17317A784 | 4 December 1978 | LER#78-086/03L-0 on 780723:snubber#63 Was Found to Be Inverted on Its Horizontal Axis During Inspec Due to Loose Rod End Locknut.Snubber Removed,Tested & Reinstalled | |
ML17317A787 | 6 December 1978 | LER#78-087/03L-0 on 781110:Containment Integrity Was Broken by Disassembling an NESW Check Valve While Reactor Plant Was in Mode 3.Early Start of Repair Has Been Reviewed by Personnel to Prevent Future Mistake | |
ML17317A791 | 7 December 1978 | LER 78-062/03L-0:on 781107,Unit 1 AB Diesel Declared Inoperable Following Inadvertent Removal of Circuit Board Card from Diesel Voltage Regulator Circuitry.Removal Caused by Technician Snagging the Board on Clothing | |
ML17317A794 | 7 December 1978 | LER#78-089/03L-0 on 781109:emergency Load Reduction Resulted in Axial Flux Difference Outside Target Band.Caused by Loss of All Generator Bus Duct Cooling |