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{
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	Issue date	Title	Topic
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

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