05000278/LER-1980-001-03, /03L-0:on 800106,during Surveillance Tests,Main Steam Line Radiation Monitor D Failed to Actuate hi-hi Trip to Initiate Channel B one-half Scram & Group 1 Isolation. Cause Unknown.Monitor Replaced | /03L-0:on 800106,during Surveillance Tests,Main Steam Line Radiation Monitor D Failed to Actuate hi-hi Trip to Initiate Channel B one-half Scram & Group 1 Isolation. Cause Unknown.Monitor Replaced | |
05000277/LER-1980-001, Forwards LER 80-001/01T-0 | Forwards LER 80-001/01T-0 | |
05000277/LER-1980-001-01, /01T-0:on 800103,w/Unit 2 at Power & Drywell Being Deinerted in Preparation for Planned Outage,Drywell Ventilation Isolation Valves AO-2521A & AO-2521B Discovered Fully Open.Caused by Lack of Procedural Control | /01T-0:on 800103,w/Unit 2 at Power & Drywell Being Deinerted in Preparation for Planned Outage,Drywell Ventilation Isolation Valves AO-2521A & AO-2521B Discovered Fully Open.Caused by Lack of Procedural Control | |
05000278/LER-1980-002-03, /03L-0:on 800118,while at Power During Insertion of Tip Probe 5 Into Core,Tip Probe Inshield Light Came On. Probe Could Be Inserted,But Not Withdrawn.Caused by Tip Inshield Limit Switch Being Out of Calibr | /03L-0:on 800118,while at Power During Insertion of Tip Probe 5 Into Core,Tip Probe Inshield Light Came On. Probe Could Be Inserted,But Not Withdrawn.Caused by Tip Inshield Limit Switch Being Out of Calibr | |
05000277/LER-1980-002-01, /01T-0:on 800110,during Leak Testing of Automatic Depressurization Sys safety-related Instrument Air Supply Piping,Identified Hard Seated Check Valves That Showed Leakage in Reverse Direction.Cause Not Stated | /01T-0:on 800110,during Leak Testing of Automatic Depressurization Sys safety-related Instrument Air Supply Piping,Identified Hard Seated Check Valves That Showed Leakage in Reverse Direction.Cause Not Stated | |
05000277/LER-1980-002, Forwards LER 80-002/01T-0 | Forwards LER 80-002/01T-0 | |
05000278/LER-1980-003-03, /03L-0:on 800303,while Performing Surveillance tests,MO-3-10-25A LPCI on A,Loop Failed to Open & RHR Pump Would Not Start.Caused by Galled Walworth 24-inch Gate, Pressure Seal Bonnet.Valve Repaired & Leak Tested | /03L-0:on 800303,while Performing Surveillance tests,MO-3-10-25A LPCI on A,Loop Failed to Open & RHR Pump Would Not Start.Caused by Galled Walworth 24-inch Gate, Pressure Seal Bonnet.Valve Repaired & Leak Tested | |
05000278/LER-1980-004-03, /03L-0:on 800205 During Plant Startup,Reactor Water Conductivity Increased & Exceeded Tech Spec Limits. Caused by Resin Injection.Reactor Was Shut Down & Primary Coolant Chemistry Brought within Tech Spec Limits | /03L-0:on 800205 During Plant Startup,Reactor Water Conductivity Increased & Exceeded Tech Spec Limits. Caused by Resin Injection.Reactor Was Shut Down & Primary Coolant Chemistry Brought within Tech Spec Limits | |
05000278/LER-1980-004, Forwards LER 80-004/03L-0 | Forwards LER 80-004/03L-0 | |
05000277/LER-1980-004-03, /03L-0:on 800123,while Performing Routine Rod Block Monitor Surveillance,Channel B Flow Biased Rod Setpoints on Rod Block Monitor Found Out of Spec by Approx 11%.Caused by Diode Failure in Analog Circuit | /03L-0:on 800123,while Performing Routine Rod Block Monitor Surveillance,Channel B Flow Biased Rod Setpoints on Rod Block Monitor Found Out of Spec by Approx 11%.Caused by Diode Failure in Analog Circuit | |
05000277/LER-1980-005-03, /03L-0:on 800126,while at Power Operation, Surveillance Testing of Diesel Driven Fire Pump Revealed Flow Less than Tech Specs.Caused by Slippage of Throttle Cable Governor,Resulting in Setpoint Drift | /03L-0:on 800126,while at Power Operation, Surveillance Testing of Diesel Driven Fire Pump Revealed Flow Less than Tech Specs.Caused by Slippage of Throttle Cable Governor,Resulting in Setpoint Drift | |
05000278/LER-1980-005-03, /03L-0:on 800207,during Surveillance Test,Setpoint of DPIS 3-13-84,reactor Core Isolation Cooling Turbine Steam Supply High Flow Sensor Found to Be 10 Inches of Water Greater than Tech Spec.Caused by Setpoint Drift | /03L-0:on 800207,during Surveillance Test,Setpoint of DPIS 3-13-84,reactor Core Isolation Cooling Turbine Steam Supply High Flow Sensor Found to Be 10 Inches of Water Greater than Tech Spec.Caused by Setpoint Drift | |
05000277/LER-1980-006-03, /03L-0:on 800305,w/both Units at Full Power,One of Two Offsite Power Sources Tripped Due to Loss of Transformer Cooling Fans.Exact Cause Unknown.Cooling Fans Restored,Blown Fuse Replaced & Transformer Tested | /03L-0:on 800305,w/both Units at Full Power,One of Two Offsite Power Sources Tripped Due to Loss of Transformer Cooling Fans.Exact Cause Unknown.Cooling Fans Restored,Blown Fuse Replaced & Transformer Tested | |
05000278/LER-1980-006-03, /03L-0:on 800213,while at Power,Reactor Core Isolation Cooling Automatic Control from Control Room Found Inoperable.Caused by Logic Circuit Board Failure in Pump Discharge Flow Controller.Defective Controller Replaced | /03L-0:on 800213,while at Power,Reactor Core Isolation Cooling Automatic Control from Control Room Found Inoperable.Caused by Logic Circuit Board Failure in Pump Discharge Flow Controller.Defective Controller Replaced | |
05000278/LER-1980-007-01, /01T-0:on 800221,during Routine Plant Equipment Insp,Seismically Qualified Backup Nitrogen Bottle Supplies to Five Containment Ventilation Valves Found Out of Svc. Caused by Lack of Operator Info & Equipment Identification | /01T-0:on 800221,during Routine Plant Equipment Insp,Seismically Qualified Backup Nitrogen Bottle Supplies to Five Containment Ventilation Valves Found Out of Svc. Caused by Lack of Operator Info & Equipment Identification | |
05000278/LER-1980-007, Forwards LER 80-007/01T-0 | Forwards LER 80-007/01T-0 | |
05000277/LER-1980-007-03, /03L-0:on 800306,while Performing Routine Surveillance Test,Pressure Switch Ps 2-2-134C Setpoint Found Less than 1% Outside of Tech Spec Limit.Caused by Setpoint Drift.Switch Recalibr | /03L-0:on 800306,while Performing Routine Surveillance Test,Pressure Switch Ps 2-2-134C Setpoint Found Less than 1% Outside of Tech Spec Limit.Caused by Setpoint Drift.Switch Recalibr | |
05000278/LER-1980-008-01, /01T-0:on 800305,while at power,E334 Load Ctr Was Shed Automatically Due to Loss of Site Startup Source,But Failed to Recover Automatically.Caused by Agastat Time Delay relay,Model7012PC,not Picking Up on Restoration | /01T-0:on 800305,while at power,E334 Load Ctr Was Shed Automatically Due to Loss of Site Startup Source,But Failed to Recover Automatically.Caused by Agastat Time Delay relay,Model7012PC,not Picking Up on Restoration | |
05000278/LER-1980-008, Forwards LER 80-008/01T-0 | Forwards LER 80-008/01T-0 | |
05000277/LER-1980-008, Forwards LER 80-008/01T-0 | Forwards LER 80-008/01T-0 | |
05000277/LER-1980-008-01, /01T-0:on 800417,while Performing Insp Requested by IE Bulletin 79-01B,discovered That Safety Factor Was Less than Acceptable.Caused by Refined Calculation.Unit 3 Isolation Valves Closed.Mods Will Be Made | /01T-0:on 800417,while Performing Insp Requested by IE Bulletin 79-01B,discovered That Safety Factor Was Less than Acceptable.Caused by Refined Calculation.Unit 3 Isolation Valves Closed.Mods Will Be Made | |
05000277/LER-1980-009-01, /01T-0:on 800502,irradiated Fuel Bundle Moved in Spent Fuel Pool for Lead Test Assembly Insp.Caused by Procedure Deficiency Which Adequately Specified Conditions Under Which Penetration Boots Could Be Removed | /01T-0:on 800502,irradiated Fuel Bundle Moved in Spent Fuel Pool for Lead Test Assembly Insp.Caused by Procedure Deficiency Which Adequately Specified Conditions Under Which Penetration Boots Could Be Removed | |
05000278/LER-1980-009-03, /03L-0:on 800414,during Normal Operation,Shift Personnel Verified Reported Leak at Suction Piping Header one-inch Drain Line Connection on D RHR Pump.Caused by Fatigue Failure of Pipe.Pump Suction Line Repaired | /03L-0:on 800414,during Normal Operation,Shift Personnel Verified Reported Leak at Suction Piping Header one-inch Drain Line Connection on D RHR Pump.Caused by Fatigue Failure of Pipe.Pump Suction Line Repaired | |
05000277/LER-1980-009, Forwards LER 80-009/01T-0 | Forwards LER 80-009/01T-0 | |
05000277/LER-1980-010, Forwards LER 80-010/01T-0 | Forwards LER 80-010/01T-0 | |
05000278/LER-1980-010-03, /03L-0:on 800421,while Performing Surveillance Test,Lpci Injection valve,MO-3-10-25B,failed to Open.Caused by Lack of Guide Clearance Between Valve Disc & Valve Guide. Valve Was Repaired & Stroked Satisfactorily | /03L-0:on 800421,while Performing Surveillance Test,Lpci Injection valve,MO-3-10-25B,failed to Open.Caused by Lack of Guide Clearance Between Valve Disc & Valve Guide. Valve Was Repaired & Stroked Satisfactorily | |
05000277/LER-1980-010-01, /01T-0:on 800603,w/unit at Power,Leak Developed in A1 Section of Condenser.Caused by Lack of Proper Procedure During Shutdown Condition Allowing Hotwell Level to Rise. Condenser Tubes to Be Decontaminated | /01T-0:on 800603,w/unit at Power,Leak Developed in A1 Section of Condenser.Caused by Lack of Proper Procedure During Shutdown Condition Allowing Hotwell Level to Rise. Condenser Tubes to Be Decontaminated | |
05000277/LER-1980-011, Forwards LER 80-011/01T-0 | Forwards LER 80-011/01T-0 | |
05000277/LER-1980-011-01, /01T-0:on 800714,during Training on Sys,Diesel Generator Cardox Sys Vapor Pilot Valve Found Closed. Cause Not Found.Valve Immediately Locked Open.Valve Also Added to Sys Checkoff & Locked Valve Lists | /01T-0:on 800714,during Training on Sys,Diesel Generator Cardox Sys Vapor Pilot Valve Found Closed. Cause Not Found.Valve Immediately Locked Open.Valve Also Added to Sys Checkoff & Locked Valve Lists | |
05000278/LER-1980-011-03, /03L-0:on 800516,during Power Operation,Instrument Surveillance Test Revealed Setpoint for Pressure Switch 3-2-128B at 33 Psi Above Tech Spec.Caused by Barksdale Model PIH-M8555-V Pressure Switch Setpoint Drift | /03L-0:on 800516,during Power Operation,Instrument Surveillance Test Revealed Setpoint for Pressure Switch 3-2-128B at 33 Psi Above Tech Spec.Caused by Barksdale Model PIH-M8555-V Pressure Switch Setpoint Drift | |
05000277/LER-1980-012, Forwards LER 80-012/01T-0 | Forwards LER 80-012/01T-0 | |
05000278/LER-1980-012-03, /03L-0:on 800520,during Full Power Operation, Routine Testing Revealed Pressure Switch 5121B Setpoint at 700 Psi Above Tech Spec.Caused by Personnel Error.Setpoint Adjusted.Technician Instructed | /03L-0:on 800520,during Full Power Operation, Routine Testing Revealed Pressure Switch 5121B Setpoint at 700 Psi Above Tech Spec.Caused by Personnel Error.Setpoint Adjusted.Technician Instructed | |
05000277/LER-1980-012-01, /01T-0:on 800721,during Operational Hydro,Scram Discharge Vol Vent & Drain Valves Failed to Operate. Investigation Indicated at Least One Vent & Drain Solenoid & Both Backup Scram Solenoids Failed | /01T-0:on 800721,during Operational Hydro,Scram Discharge Vol Vent & Drain Valves Failed to Operate. Investigation Indicated at Least One Vent & Drain Solenoid & Both Backup Scram Solenoids Failed | |
05000277/LER-1980-013-03, /03L-0:on 800801,during Refueling Outage, Surveillance Leak Test Results Exceeded Tech Spec Limits Due to Leakage Failure of Eight Msivs.Caused by Improper Seat Contact Due to Damage to Seats,Plugs & Guides | /03L-0:on 800801,during Refueling Outage, Surveillance Leak Test Results Exceeded Tech Spec Limits Due to Leakage Failure of Eight Msivs.Caused by Improper Seat Contact Due to Damage to Seats,Plugs & Guides | |
05000278/LER-1980-013-03, /03L-0:on 800605,during Surveillance Test,Pressure Switch Ps 3 5 12C Found 0.3 Psig Above Tech Spec Limit. Caused by Setpoint Drift.Switch Recalibr,Tested & Returned to Svc | /03L-0:on 800605,during Surveillance Test,Pressure Switch Ps 3 5 12C Found 0.3 Psig Above Tech Spec Limit. Caused by Setpoint Drift.Switch Recalibr,Tested & Returned to Svc | |
05000278/LER-1980-014-03, /03L-0:on 800608,while Performing ST 6.9,valve Mo 3-10-26B Failed to Close After Stroked Open.Caused by Mechanical Problem in Valve.Mo 3-10-26B to Be Disassembled & Repaired | /03L-0:on 800608,while Performing ST 6.9,valve Mo 3-10-26B Failed to Close After Stroked Open.Caused by Mechanical Problem in Valve.Mo 3-10-26B to Be Disassembled & Repaired | |
05000277/LER-1980-014-04, /04T-0:on 800808,oil Sheen Observed on Conowingo Pond,Near Berm That Separates Pond from Cooling Towers. Caused by Oil Overflow Due to Incorrect Level Gauge Reading in Diesel Storage Tank a During Oil Delivery.Gauge Recalibr | /04T-0:on 800808,oil Sheen Observed on Conowingo Pond,Near Berm That Separates Pond from Cooling Towers. Caused by Oil Overflow Due to Incorrect Level Gauge Reading in Diesel Storage Tank a During Oil Delivery.Gauge Recalibr | |
05000277/LER-1980-014, Forwards LER 80-014/04T-0 | Forwards LER 80-014/04T-0 | |
05000278/LER-1980-015-03, /03L-0:on 800707,during Full Power operation,3A Refuel Floor Exhaust Rad Monitor Found Drifting Downscale. Cause Has Not Been Determined.New Gm Tube & Electronic Circuitry Installed | /03L-0:on 800707,during Full Power operation,3A Refuel Floor Exhaust Rad Monitor Found Drifting Downscale. Cause Has Not Been Determined.New Gm Tube & Electronic Circuitry Installed | |
05000277/LER-1980-015-03, /03L:on 800904,during Surveillance Test of Reactor Core Isolation Cooling Steam Line High Flow Switches, Outboard Steam Supply Isolation Valve Failed to Close.Caused by Limit Switch Malfunction.Switch Repaired | /03L:on 800904,during Surveillance Test of Reactor Core Isolation Cooling Steam Line High Flow Switches, Outboard Steam Supply Isolation Valve Failed to Close.Caused by Limit Switch Malfunction.Switch Repaired | |
05000278/LER-1980-016, Forwards LER 80-016/01T-0 | Forwards LER 80-016/01T-0 | |
05000278/LER-1980-016-01, /01T-0:on 800717,reanalysis by Bechtel of as-built Piping Determined That Stresses on Snubber 3-10-GB-S-44 Exceeded Operability Criteria.Caused by Inadequate Design Due to as-built Condition & Seismic Analysis Info Variance | /01T-0:on 800717,reanalysis by Bechtel of as-built Piping Determined That Stresses on Snubber 3-10-GB-S-44 Exceeded Operability Criteria.Caused by Inadequate Design Due to as-built Condition & Seismic Analysis Info Variance | |
05000277/LER-1980-016-03, /03L-0:on 800909,during Surveillance Testing W/Unit at Full Power,Eccs a Channel Logic Relay Failed to Function Properly W/Simulated Low Reactor Pressure.Caused by Dirty Contacts on GE Type Hfa Relay.Contacts Cleaned | /03L-0:on 800909,during Surveillance Testing W/Unit at Full Power,Eccs a Channel Logic Relay Failed to Function Properly W/Simulated Low Reactor Pressure.Caused by Dirty Contacts on GE Type Hfa Relay.Contacts Cleaned | |
05000278/LER-1980-017-03, /03L-0:on 800802,during Surveillance Test on PCIS Normally Open Valves,Drywell 2-inch Valve AO-3509 Failed to Close.Caused by Tight Packing on Valve.Packing & Proper Operation Verified | /03L-0:on 800802,during Surveillance Test on PCIS Normally Open Valves,Drywell 2-inch Valve AO-3509 Failed to Close.Caused by Tight Packing on Valve.Packing & Proper Operation Verified | |
05000277/LER-1980-017-03, /03L-0:on 800906,during Surveillance Test at Full Power,Rhr B Subsystem Pump Room Cooler Failed to Start Automatically.Caused by Improper Adjustment of Cell Switch on Pump Breaker.Breaker Replaced & Test Completed | /03L-0:on 800906,during Surveillance Test at Full Power,Rhr B Subsystem Pump Room Cooler Failed to Start Automatically.Caused by Improper Adjustment of Cell Switch on Pump Breaker.Breaker Replaced & Test Completed | |
05000277/LER-1980-018-03, /03L-0:on 800918,HPCI Turbine Steam Line High Flow Trip Instrument Revealed That Setpoint Was 5 Inches Above Tech Spec Limit.Caused by Setpoint Drift of Instrument. Instrument Recalibr | /03L-0:on 800918,HPCI Turbine Steam Line High Flow Trip Instrument Revealed That Setpoint Was 5 Inches Above Tech Spec Limit.Caused by Setpoint Drift of Instrument. Instrument Recalibr | |
05000278/LER-1980-018-03, /03L-0:on 800802,during Surveillance Test on PCIS Normally Open Valves W/Unit at Full Power,Reactor Water Cleanup Sys Return Isolation Valve MO-3-12-68 Failed to Close Using Control Switch.Cause Not Determined | /03L-0:on 800802,during Surveillance Test on PCIS Normally Open Valves W/Unit at Full Power,Reactor Water Cleanup Sys Return Isolation Valve MO-3-12-68 Failed to Close Using Control Switch.Cause Not Determined | |
05000277/LER-1980-019-03, /03L-0:on 800906,during Surveillance Testing, Primary Containment Air Sample Flow Discovered Lost.Caused by Short in Coil of Demo Type Solenoid Valve Which Blew Fuse Common to All Seven Valves.Coil Replaced | /03L-0:on 800906,during Surveillance Testing, Primary Containment Air Sample Flow Discovered Lost.Caused by Short in Coil of Demo Type Solenoid Valve Which Blew Fuse Common to All Seven Valves.Coil Replaced | |
05000278/LER-1980-019-03, /03L-0:on 800806,while Performing Surveillance Test on RHR Sys W/Unit at power,MO-3-10-25A LPCI Injection Valve Failed to Open.Caused by Multiple Full Penetration Cracks on Drive Sleeve of Type SMB-4 Limitorque Operator | /03L-0:on 800806,while Performing Surveillance Test on RHR Sys W/Unit at power,MO-3-10-25A LPCI Injection Valve Failed to Open.Caused by Multiple Full Penetration Cracks on Drive Sleeve of Type SMB-4 Limitorque Operator | |
05000277/LER-1980-020-01, /01T-0:on 800926,breaker Which Supplies Power to B Standby Liquid Control Sys Pump & B Squib Valve Found Open. Caused by Accidental Tripping of Pump Breaker.Breaker Switches of All Sblc Pumps Locked | /01T-0:on 800926,breaker Which Supplies Power to B Standby Liquid Control Sys Pump & B Squib Valve Found Open. Caused by Accidental Tripping of Pump Breaker.Breaker Switches of All Sblc Pumps Locked | |