Pages that link to "05000272/LER-1983-011, Forwards LER 83-011/01T-0.Detailed Event Analysis Encl"
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The following pages link to 05000272/LER-1983-011, Forwards LER 83-011/01T-0.Detailed Event Analysis Encl:
Displayed 13 items.
- 05000311/LER-1983-008, Forwards LER 83-008/99X-0.Detailed Event Anaysis Encl (← links)
- 05000272/LER-1983-015, Forwards LER 83-015/03L-0.Detailed Event Analysis Encl (← links)
- 05000272/LER-1983-010, Forwards LER 83-010/03L-0.Detailed Event Analysis Encl (← links)
- ML20069D226 (redirect page) (← links)
- 05000272/LER-1983-011 (redirect page) (← links)
- 05000272/LER-1983-014, Forwards LER 83-014/03L-0.Detailed Event Analysis Encl (← links)
- 05000311/LER-1983-017, Supplemental LER 83-017/03X-1:on 810515,during Startup & Cycle 1 Operations,Leakage Past Pressurizer PORVs & Pressurizer Overpressure Protection Sys Values Observed. Cause Not Stated.Porvs Modified (← links)
- 05000311/LER-1983-007, Telecopy Message of LER 83-007/01P:on 830218,two 1,000-kip Steam Generator Snubbers Failed to Meet Lockup & Bleed Rate Velocity Requirements.Cause Not Stated.Investigation Continuing.Detailed Rept to Be Submitted in 14 Days (← links)
- 05000272/LER-1983-003-04, /04L-0:on 830121,during Commencement of Refueling Shutdown for Unit 2,Unit 1 Restart Delayed Approx 7 Wks. Caused by Problems W/Steam Generator Nozzle Dams & Degradation of Welds in Svc Water Piping (← links)
- 05000272/LER-1983-032-03, /03L-0:on 830725,during Routine Power Operation, Boric Acid Transfer Pump 11 Tripped Shortly After Being Started,Following Completion of Batch Transfer Evolution. Cause Assumed to Be Solid Boron Obstruction (← links)
- 05000311/LER-1983-039-03, /03L-0:on 830723,control Rod 2C4 Inserted Fully & Could Not Be Withdrawn.Unit Placed in Hot Standby.Caused by Control Rod Drive Mechanism Cable Connector Pins Pushed Into Insulator,Resulting in Intermittent Connection (← links)
- 05000272/LER-1983-023-01, /01T-0:on 830602,notification Received from Westinghouse Re Potential Increased Power Peaking in Bottom of Core.Procedures Will Be Implemented to Insure Operation within Tech Spec Limits (← links)
- 05000272/LER-1983-011, Supplemental LER 83-011/01X-1:on 830225,both Reactor Trip Breakers Failed to Open Automatically on Receipt of low-low Steam Generator Level Reactor Trip Signal.Caused by Binding of Latch Mechanism in Trip Attachment (redirect page) (← links)
- ML20024E558 (redirect page) (← links)
- 05000311/LER-1983-001, Forwards LER 83-001/03L-0.Detailed Event Analysis Encl (← links)
- 05000272/LER-1983-007, Forwards LER 83-007/03L-0.Detailed Event Analysis Encl (← links)
- 05000272/LER-1983-006, Forwards LER 83-006/03L-0.Detailed Event Analysis Encl (← links)
- 05000311/LER-1983-003, Forwards LER 83-003/03L-0.Detailed Event Analysis Encl (← links)
- 05000272/LER-1983-005, Forwards LER 83-005/03L-0.Detailed Event Analysis Encl (← links)
- 05000272/LER-1983-003, Forwards LER 83-003/04L-0.Detailed Event Analysis Encl (← links)
- 05000272/LER-1983-008, Supplemental LER 83-008/03X-1:on 830311,pressurizer Code Safety Valves 1PR3,1PR4 & 1PR5 Exceeded Lift Set Pressure Range & Had Heavy Seat Leakage.Partly Caused by Difference in Test Vs Actual Operating Conditions (← links)
- 05000311/LER-1983-023, Corrected LER 83-023/03L-0:on 830117-0418,seven Containment Isolation Valves Experienced Leakage Rates Greater than Max Range of Test Equipment.Total Containment Type B & C Leakage Could Not Be Demonstrated.Valves Repaired (← links)
- 05000311/LER-1983-015, Forwards LER 83-015/03L-0.Detailed Event Analysis Encl (← links)
- 05000311/LER-1983-012, Forwards LER 83-012/03L-0.Detailed Event Analysis Encl (← links)
- 05000311/LER-1983-013, Forwards LER 83-013/03L-0.Detailed Event Analysis Encl (← links)
- 05000311/LER-1983-083, Forwards Supplemental LER 83-083/03X-1.Detailed Event Analysis Encl (← links)
- 05000311/LER-1983-011, Forwards LER 83-011/03L-0.Detailed Event Analysis Encl (← links)
- 05000311/LER-1983-004, Forwards LER 83-004/04L-0.Detailed Event Analysis Encl (← links)
- 05000311/LER-1983-002, Forwards LER 83-002/03L-0.Detailed Event Analysis Encl (← links)
- 05000272/LER-1983-018, Forwards LER 83-018/03L-0.Detailed Event Analysis Encl (← links)
- 05000311/LER-1983-010, Forwards LER 83-010/03L-0.Detailed Event Analysis Encl (← links)
- 05000311/LER-1983-009, Forwards LER 83-009/03L-0.Detailed Event Analysis Encl (← links)
- 05000272/LER-1983-013, Forwards LER 83-013/99T-0.Detailed Event Analysis Encl (← links)
- 05000311/LER-1983-005-03, /03X-1:on 830122,both Channels of Pressurizer Overpressurization Protection Sys Declared Inoperable Due to Leakage in Pressurizer Relief Lines.Porv Plugs Replaced & PORV Circuitry Modified (← links)
- 05000272/LER-1983-043-03, /03L-0:on 830920,during Routine Operation,Delta Temp/Delta Pressure Station Auxiliary Performer Chart Recorder Indication Failed.Caused by P-250 Computer Electronic Lockup.Computer Rebootstrapped (← links)
- 05000272/LER-1983-024-03, /03L-0:on 830525,supply Breaker to Vital Instrument 1C Inverter Inadvertently Opened.Automatic Transfer to Alternate Power Supply Occurred W/No Loss of Equipment or Indication (← links)
- 05000272/LER-1983-026-03, /03L-0:on 830530,containment Fan Coil Unit (Cfcu) 17 Svc Water Flow Observed Below Tech Specs.Cfcu Declared Inoperable.Caused by Valve 15SW57 Being Plugged W/Shells & Debris from Cleaning of Svc Water Sys (← links)
- 05000311/LER-1983-018-03, /03L-0:on 830428,during pre-test Insp of Fuel Handling Area Ventilation Sys,Roughing Filter Elements Found Installed in HEPA Filter Location in Normal Filter Train. Filters Replaced.Procedures Revised (← links)
- 05000311/LER-1983-019-03, /03L-0:on 830430,vital Instrument Bus 20 Deenergized & Tagged Out for Maint,Resulting in Loss of Power Range Channel N-44.Caused by Shift Supervisor Being Unaware of Deenergization (← links)
- 05000311/LER-1983-064-03, /03L-0:on 831202,during Surveillance Test on Low Pressure Carbon Dioxide Fire Suppression Sys,Pilot Valve 2FP377 Did Not Completely Seat.Caused by Frost on Valve Seat.Valve Seated Properly (← links)
- 05000272/LER-1983-061-03, /03L-0:on 831209,reactor Trip Sys & ESF Actuation Sys Instrumentation Surveillance Testing Not Completed within 1 H Limit Required by Tech Specs.Caused by Typographical Error in Procedure (← links)
- 05000311/LER-1983-061-03, /03L-0:on 831207,during Maint Shutdown,Safeguards Equipment Control Channel 2A Inadvertently Actuated While Testing,Causing Vital Bus 2A to Be Deenergized.Caused by Reversing Polarity of Leads (← links)
- 05000311/LER-1983-065-03, /03L-0:on 831207,diesel Generator 2B Voltage Regulator Failed,Causing Generator Breaker to Trip on Overcurrent.Caused by Grounded Voltage Regulator Control Power Transformer.Transformer Replaced (← links)
- 05000272/LER-1983-060-03, /03L-0:on 831203,during Routine Surveillance,Vital Heat Trace Channel 602B Failed to Draw Greater than 0.5 Amps as Required.Caused by Connections Exhibiting High Resistance.Terminals Cleaned & Tightened (← links)
- 05000272/LER-1983-062-99, /99X-0:on 831122,triaxial time-history Accelograph Inside Bioshield on 81-ft Elevation of Containment Bldg Failed.Cause Not Stated.Accelerometer Will Be Replaced During Next Outage (← links)
- 05000272/LER-1983-057-03, /03L-0:on 831115,containment Hydrogen Analyzer Channel 11 Exhibited Low Output During Routine Calibr Checks & Declared Inoperable.Caused by Failed Detector.Detector Replaced & Calibr (← links)
- 05000272/LER-1983-058-03, /03L-0:on 831118,air Lock Exterior Door Exhibited Leakage Rate Greater than Allowed by Tech Specs.Air Lock Declared Inoperable.Caused by Loose Door Latch Assembly.Door Latch Assembly Tightened (← links)
- 05000272/LER-1983-059-03, /03L-0:on 831128,air Lock Interior Door at Elevation 130 Ft Exhibited Leakage Rate Greater than Allowed by Tech Specs.Caused by Outer Seal of Interior Door Not Seated Properly in Groove.Personnel Retrained (← links)
- 05000311/LER-1983-060-01, /01T-0:on 831128,inverter 2B Not Connected to Dc Bus,Rendering Inverter Technically Inoperable.Caused by Requirement Oversight Due to Different Tech Spec Requirements.Tech Spec Difference Resolved (← links)
- 05000311/LER-1983-059-03, /03L-0:on 831108,spurious Actuation Involving Safeguards Equipment Control 2P Encountered.Probably Caused by Previous Relay Testing.Relays Replaced (← links)
- 05000311/LER-1983-058-03, /03L-0:on 831107,diesel Generator 2B Declared Inoperable Due to Inability of Diesel to Maintain Rated Speed & Voltage.Caused by Loose shaft-driven Fuel Oil Pump Coupling.Coupling Repaired (← links)
- 05000272/LER-1983-051-03, /03L-0:on 831103,unidentified Containment Sump Inleakage Exceeded Tech Spec Limit of 1 Gpm.Caused by Packing Failure on Valve 1CV75 & Bonnet Leak on 12GB3.Gland Repacked & Bonnet Clamped & Furmanited (← links)
- 05000272/LER-1983-052-03, /03L-0:on 831104,containment Fan Coil Unit 11 Tripped While Starting in Fast Speed for Daily Surveillance. Caused by Shorted & Grounded Motor Stator Windings.Motor Replaced (← links)
- 05000272/LER-1983-054-03, /03L-0:on 831112,intermediate Range Channel N35 High Flux Bistable Trip Did Not Occur When Power Reached 25%.Caused by Setpoint Drifting Out of Calibr.Channel Recalibr (← links)
- 05000272/LER-1983-050-03, /03L-0:on 831031,130-ft Elevation Airlock Interior Door Failed Surveillance Test & Declared Inoperable.Caused by Improperly Seated Seal.Personnel Will Be Trained in Proper Airlock Operation (← links)
- 05000272/LER-1983-055-03, /03L-0:on 831110,RCS Unidentified Leakage Exceeded Tech Spec Limit.Caused by Change in Containment Fan Coil Unit Configuration & Speed.Unit Shut Down to Identify & Repair Leaks in Containment (← links)
- 05000272/LER-1983-053-01, /01T:on 831114,radiation Monitoring Channel 1R11a Failed to Isolate Containment Ventilation.Other Channels Indicated Same Problem.Cause Not Stated.Signal Reset,Causing All Channels to Be Blocked (← links)
- 05000272/LER-1983-049-03, /03L-0:on 831017,foreign Matl Discovered in Safety Injection Pump 11 Oil Reservoir,Rendering Pump Inoperable.Caused by Pump leak-off Backed Up in Catch Trough Due to Plugged Drain Line (← links)
- 05000311/LER-1983-057-03, /03L-0:on 831006,during Performance of Run to Prove Operability of Auxiliary Feedwater Pump 23,noise Heard & Turbine Tripped.Pump Declared Inoperable.Caused by Closed Turbine Steam Supply Line Valves Failure (← links)
- 05000311/LER-1983-051-03, /03L-0:on 830929,pressure Demand Signal Dropped, Causing Pressurizer Spray Valves to Open & RCS Pressure to Drop.Caused by Difference Between Two Channel Signal Isolator Outputs to Pressurizer Controller (← links)
- 05000311/LER-1983-054-03, /03L-0:on 831001,during Routine Surveillance, Control Rod Position Indicator 1B4 Indicated Slightly Greater than Max Value Allowed by Tech Specs.Caused by Drifting of Channel Calibr.Indicator Recalibr (← links)
- 05000311/LER-1983-055-03, /03L-0:on 831004,during Routine Power Operation, Steam Generator Pressure Channel II Instrument 21 Indicated Excessively Different than Redundant Channels.Cause Unknown. Minor Calibr Performed (← links)
- 05000311/LER-1983-052-03, /03L-0:on 830928 & 1005,130-ft Elevation Containment Air Lock Failed to Meet Requirements for Routine Surveillance Testing of Air Lock Door Seals.Possibly Caused by Improper Test Methods.Training Upgraded (← links)
- 05000311/LER-1983-053-99, /99X-0:on 830812,while Increasing RCS Pressure to 2,000 Psig,Both Pressurizer Spray Valves Opened & RCS Pressure Started to Decrease.Probably Caused by Pressure Control manual-auto Loading Station (← links)
- 05000311/LER-1983-056-03, /03L-0:on 831005,operator Noticed Trip Indication for Auxiliary Feedwater Pump 23 Illuminated.Caused by Valve Latching Operation Not Properly Performed.Valve Position Indication Sys Devised (← links)
- 05000272/LER-1983-047-03, /03L-0:on 831006,control Room Operator Discovered Control Rod Position Indicator 1D4 Channel Indicating Greater than Max Allowable Deviation.Caused by Calibr Drift. Indicator & Module Recalibr (← links)
- 05000272/LER-1983-048-03, /03L-0:on 830815,charging Pump 11 Declared Inoperable When Oil Observed Issuing from Speed Increaser Air Breather.Caused by Leak in Lube Oil Cooler Due to Erosion/Corrosion.Cooler Replaced (← links)
- 05000272/LER-1983-039-03, /03L-0:on 830904,P-250 Computer CRT Did Not Display Updated Info,Rendering RCS Subcooling Monitor Inoperable.Caused by Computer Being Electronically Locked Up.Computer Cleared & Rebootstrapped (← links)
- 05000272/LER-1983-044-03, /03L-0:on 830926 & 1005,during Routine Surveillance,Containment Air Lock Failed to Meet Test Requirements.Caused by Improper Operation of Air Lock. Personnel Training Will Be Upgraded (← links)
- 05000272/LER-1983-046-03, /03L-0:on 830924,control Room Operator Observed overtemp-delta Instrument 13 Setpoint Reading Higher than Allowed by Tech Spec.Caused by Functional Generator Calibr Drift.Generator & Indicator Recalibr (← links)
- 05000311/LER-1983-047-03, /031-0:on 830829,various 2A Safeguards Equipment Control (Sec) Alarms Received.On 830830 Vital Bus 2A Tripped W/O Automatic Transfer.Cause Under Investigation.Sec Channel Reset.Power Restored to Bus (← links)
- 05000311/LER-1983-049-01, /01T-0:on 830923,containment Compressed Air Supply Isolation Valve Discovered Not Locked Closed.Caused by Personnel Error During Verification of Equipment Status During Mode Change.Operators Counseled (← links)
- 05000272/LER-1983-037-03, /03L-0:on 830821,mechanical Repairman Inadvertently Loosened Flanges on Outlet Valve 11 of Boric Acid Storage Tank.Flanges Retightened.Leakage Stopped (← links)
- 05000311/LER-1983-041-03, /03L-0:on 830801 & 09,spurious Actuations of Safeguards Equipment Control Sys Channel a Caused Deenergization of Vital Bus 2A.Possibly Caused by near-short Condition on Output Test Panel Terminals (← links)
- 05000311/LER-1983-042-03, /03L-0:on 830802 & 11,control Rod Position Indicator Channel Indicated Greater than 12 Steps Difference as Compared to Group Demand Indication.Caused by Indicator Reading Low & Signal Conditioner Module Drift (← links)
- 05000311/LER-1983-043-03, /03L-0:on 830802 & 07,reactor Coolant Flow Channel I,Number 24 Indicated Excessively High.Caused by Static Shift in Transmitter & Failure of Transmitter Oscillator, Respectively.Transmitter Readjusted (← links)
- 05000311/LER-1983-067-03, /03L-0:on 831231,during Surveillance Testing, Diesel Generator 2B Experienced Fuel Oil Leak on Cylinder Injector 8R.Caused by Fuel Oil Manifold to Injector Gasket Leakage.Gasket Replaced (← links)
- 05000272/LER-1983-074-03, /03L-0:on 831230,due to Icing Conditions at Circulators,Control RPI 2A3 & 1C1 Exceeded 12 Steps from Group Demand Position for Group.Caused by Drift of Sensor Output.Channels Recalibr (← links)
- 05000272/LER-1983-070-03, /03L-0:on 831221,exterior Door of 100-ft Elevation Airlock Exhibited Excessive Leakage During Surveillance Testing.Caused by Cut Exterior Door Outer Seal. Seal Replaced (← links)
- 05000311/LER-1983-066-03, /03L-0:on 831220,common Suction Valve 2RH1 Closed, Resulting in Loss of RHR Flow.Caused by Personnel Error.Rhr Pump 22 Started & RHR Flow Reestablished within 22 Minutes (← links)
- 05000272/LER-1983-068-03, /03L-0:on 831224,operator Observed Steam Issuing from Diesel Fire Suppression Pump 1 Cooling Water Expansion Tank.Caused by Frozen Diesel Water Cooling Lines Due to Subzero Temps.Damper Shut.Lines Thawed (← links)
- 05000272/LER-1983-069-03, /03L-0:on 831226,fire Protection Header Pressure Dropped Suddenly Due to Ruptured 4-inch Alarm Valve.Caused by Frozen Water within Valve.New Valve Ordered & Will Be Installed Upon Receipt (← links)
- 05000272/LER-1983-071-03, /03L-0:on 831222,containment Fan Coil Unit (Cfcu) 14 Removed from Svc to Repair Flexible Connector.Connector Temporarily Repaired.Cfcu Returned to Operable Status (← links)
- 05000272/LER-1983-075-03, /03L-0:on 831227,microprocessor Memory Lost for Hydrogen Analyzer Channel 12 & 13.Caused by Voltage Transient on Vital Instrument Bus 2B Making Microprocessor Lose Constants.Constants Reinstalled (← links)
- 05000272/LER-1983-073-03, /03L-0:on 831223,during Surveillance Testing on Emergency Diesel Generator 1B,jacket Water Cooling Leak from Instrument Line Discovered.Caused by Elbow Cracking Due to Engine Vibration.Design Change Initiated (← links)
- 05000272/LER-1983-065-03, /03L-0:on 831226,containment Sump Level Monitoring Sys Indicated Unsubstantiated Leakage.Steam Generator 14 Secondary Handhole Cover Found Leaking.Cause Not Stated. Cover Repaired (← links)
- 05000272/LER-1983-063-03, /03L-0:on 831214,axial Flux Difference Recorder & Monitor Alarm Not Monitored & Logged When Removed from Svc to Perform Routine Change of Target Flux Difference Value.Caused by Personnel Error (← links)
- 05000272/LER-1983-067-03, /03L-0:on 831220,minor Leak Developed on Diesel Cooling Water Expansion Tank.Caused by Bushing Wear Allowing Radial Shaft Movement.Leak Repaired,Pump Tested & Declared Operable (← links)
- 05000272/LER-1983-064-03, /03L-0:on 831214,fuel Oil Leak Found on Fire Suppression Pump Diesel Engine 1 & Pump Declared Inoperable. Caused by Fuel Oil Pressure Gauge Hose Rupture Due to Wear from Normal Engine Vibration.Hose Replaced (← links)
- 05000272/LER-1983-004-03, /03L-0:on 830124,equipment Operator Discovered Leak on Diesel Generator 1B Jacket Water Sys.Caused by Cracked Piping Nipple Due to Personnel Standing on Jacket Water Sys Piping.Cracked Nipple Replaced (← links)
- 05000272/LER-1983-005-03, /03L-0:on 830121,RHR Sys Automatic Isolation Function Not Tested Prior to Placing RHR Sys in Operation. Caused by Procedure Problems & Personnel Inexperience. Procedures Revised (← links)
- 05000272/LER-1983-072-01, /01T-0:on 831229,fire Suppression Water Storage Tanks Indicated Level Below Min Capacity Allowed.Caused by Incorrect Fire Suppression Storage Tank Capacity Curves.New Tank Capacity Curves Generated (← links)
- 05000272/LER-1983-066-01, /01T-0:on 831225 & 26,fire Suppression Water Storage Tank Capacity Dropped Below Min.Caused by Ruptured Elbow on Sprinkler Riser Due to Freezing.Elbow Replaced & Number of Operating Pumps Increased (← links)
- 05000311/LER-1983-062-03, /03L-0:on 831128,during Vital Instrument Bus Transfer,Rhr Common Suction Valve 2RH2 Closed,Resulting in Loss of RHR Flow Through Rcs.Caused by Pressure Transmitter PT-405 Spike Due to Voltage Transient (← links)
- 05000272/LER-1983-045-03, /03L-0:on 830925,on Two Separate Occasions, Failure of P-250 Process Computer Resulted in Inoperability of RCS Subcooling Monitor.Caused by High Room Temp.Room Cooled Down & Computer Rebooted (← links)
- 05000311/LER-1983-048-03, /03L-0:on 830927,attempts to Demonstrate Operability of Pressurizer Overpressure Protection Sys Valves Failed.Caused by Problems W/Valve Position Indicators.Porv Circuitry Modified (← links)
- 05000272/LER-1983-040-03, /03L-0:on 830916,reactor Trip Breaker 1 post-maint Surveillance Not Completed within 1 H Interval.Caused by Addl Testing Incorporated Into Surveillance.License Change Request Will Be Submitted to Increase Interval (← links)
- 05000272/LER-1983-041-03, /03L-0:on 830915,discovered Containment Air Particulate Detector Filter Failure Alarm Illuminated.Caused by Inadequate Supply of Filter Paper.New Filter Paper Installed (← links)
- 05000311/LER-1983-050-03, /03L-0:on 830916,pressure Drop Test Surveillance of Containment Isolation Valves 2VC5 & 2VC6 Revealed That Leakage Past Valves Greater than Max Range of Test Equipment.Caused by Deformed Elastomer Lining (← links)
- 05000272/LER-1983-042-04, /04L-0:on 830914,routine Release of Radioactive Liquid from Chemical & Vol Control Monitoring Tank 11 Performed W/O Verification of Operability of Release Line Effluent Monitor.Procedure Revised (← links)
- 05000311/LER-1983-038-03, /03L-0:on 830827,vital Bus 2B Hydrogen Analyzer Channels 12 & 22 Failed to Restart.Caused by Voltage Transient.Channel Circuits Replaced & Restarted & Action Statement Terminated (← links)
- 05000311/LER-1983-046-03, /03L-0:on 830816 & 18,containment Fan Coil Unit 22 Observed to Trip During Low Speed Operation.Caused by Allowable Breaker Trip Device Setpoint Deviation.Adjustments Made & Incorporated Into Procedures (← links)
- 05000311/LER-1983-045-03, /03L-0:on 830814 & 15,surveillance Testing of Containment Air Lock Revealed Broken Air Flow Test Gauge Cover & Excessively Leaking Outer Door Seals.Caused by Improper Use.Cover & Seals Replaced (← links)
- 05000272/LER-1983-031-04, /04L-0:on 830711,13 & 19,dead Sea Turtles Impinged on Circulating Water Sys Intake Trash Bars.Caused by Large Vol of River Water Drawn Through Sys Intake.No Corrective Action Necessary (← links)
- 05000311/LER-1983-035-01, /01T-0:on 830725,flux Map Results Indicated That Tech Spec Limits for Enthalpy Hot Channel Factor Would Be Exceeded During Low Power Operation W/Control Rods Near Insertion Limits.Caused by Improper Modeling (← links)
- 05000311/LER-1983-037-03, /03L-0:from 830705-07,four Steam Generator Safety Valves Found to Have Lift Settings Less than Required by Tech Specs.Caused by Inadequacies in Surveillance Procedures & Maint on Valves.Valves Reset (← links)
- 05000311/LER-1983-033-03, /03L-0:on 830707,during Start of Auxiliary Feedwater Pump 23 for Monthly Surveillance,Large Amount of Steam Emitted from Pump Vicinity.Caused by Hole in Pump Steam Supply Drain Line.Leaky Section Replaced (← links)
- 05000311/LER-1983-034-03, /03L-0:on 830708,surveillance Testing Revealed Excessive Seal Leakage on Inner Door of 130-ft Elevation Containment Air Lock.Caused by Rapid Operation of Door So Door Seals Unevenly Seated in Seal Groove (← links)
- 05000272/LER-1983-030-03, /03L-0:on 830710,emergency Diesel Generator 1A Tripped During Routine Surveillance.Caused by Security Guard Inadvertently Striking Emergency Trip Button.Personnel Eliminated from Security Force (← links)
- 05000311/LER-1983-029-99, /99L-0:on 830617,pressurizer Overpressure Protection Sys Actuated Due Pressure Transient Resulting from Compressed Pressurizer Bubble.Caused by Personnel Leaving Charging Pump in Svc (← links)
- 05000311/LER-1983-031-03, /03L-0:on 830623,spurious Safeguards Equipment Control Sys Actuation Deenergized Various Loads on Vital Bus 2A.Caused by Internal Circuitry Noise.Corrective Action to Be Taken When Investigation Completed (← links)
- 05000311/LER-1983-032-03, /03L-0:on 830623,large Leak Discovered in Svc Water Bay 2.Caused by Failed Gasket in Joint Downstream of Check Valve 22SW5 Due to Poor Access to Joint.Joint Remade & Design Changed (← links)
- 05000272/LER-1983-029-03, /03L-0:on 830617,control Room Operator Discovered Three RPI Channels Indicating Greater than Max Allowed Deviation in Tech Specs.Caused by Calibr Drift in Two Channels.Channels Recalibr (← links)
- 05000272/LER-1983-034-01, /01T-0:on 830811,pump Turbine Trip Valve Was in Tripped Position & Auxiliary Feedwater Pump 13 Failed to Start Automatically Due to Accumulation of Grass on Intake Screens.Caused by Out of Adjustment Switch (← links)
- 05000311/LER-1983-044-01, /01T-0:on 830811,following Reactor Trip,Vital Bus Sustained Degraded Undervoltage Relays Found Slightly Below Min Value.Caused by Setpoint Drift.Relays Recalibr (← links)
- 05000272/LER-1983-033-01, /01T-0:on 830811,unit Tripped.Caused by Grass & Debris Accumulation on Circulating Water Sys Intake Screens. Screens Cleaned.Debris Will Be Routinely Cleaned from Sys Intakes (← links)
- 05000311/LER-1983-015-03, /03L-0:on 830407,during Routine Shutdown for Refueling,Testing Results of Four Mechanical Snubbers Revealed That Devices Did Not Meet Tech Spec Requirements. Cause Not Stated.Snubbers Returned to Manufacturer (← links)
- 05000311/LER-1983-012-03, /03L-0:on 830406,10-ton Cardox Sys Pilot Valve Found in Closed Position & All Low Pressure Sys Declared Inoperable.Caused by Inadequacies in Sys Recharging Operation on 830304.Procedures Revised (← links)
- 05000311/LER-1983-013-03, /03L-0:on 830409,during Routine Shutdown,Lube Oil Temp Increases Observed on Charging Pump 22.Caused by Restricted Svc Water Flow to Pump Due to Oyster Shells & Miscellaneous Mollusks.Shells Removed (← links)
- 05000311/LER-1983-011-03, /03L-0:on 830401,discovered That Monthly Testing of Control Room Emergency Air Conditioning Sys Was Overlooked.Caused by Insp Order Sys Card Requiring Testing Being Erroneously Stated.Card Revised (← links)
- 05000272/LER-1983-009-99, /99X-0:on 830130,during Routine Plant Cooldown, Inadvertent Safety Injection Occurred Due to Low Pressurizer Pressure.Caused by Operator Overlooking Decreasing Pressure. All safety-related Equipment Functioned as Designed (← links)
- 05000272/LER-1983-019-03, /03L-0:on 830315,diesel Fire Pump 2 Failed to Automatically Start on Decreasing Header Pressure & Declared Inoperable.Caused by Loose Wiring Connection on Diesel Engine Starter.Wiring Connection Retightened (← links)
- 05000311/LER-1983-004-04, /04L-0:on 830317,during Gaseous Effluent Testing, Iodine/Particulate Collection Device Sample Pump Deenergized.Caused by Not Including Pump on Electrical Distribution List.Tagging Sys Will Be Revised (← links)
- 05000311/LER-1983-002-03, /03L-0:on 830314,discovered Pressurizer Code Safety Valves 2PR3,2PR4 & 2PR5,tested by Wyle Labs During 830224-25,lifted Below 2,485 Psig Plus/Minus 1% Pressure Range & Displayed Heavy Audible & Visual Seat Leakage (← links)
- 05000272/LER-1983-008-03, /03L-0:on 830311,discovered Pressurizer Code Safety Valves Tested for Lift Set Pressure & Seat Leakage by Wyle Labs During 821102-13 Lifted in Excess of Tech Specs & Exhibited Heavy Seat Leakage.Cause Undetermined (← links)
- 05000272/LER-1983-018-03, /03L-0:on 830223,sample Results for Boric Acid Tanks Indicated Boric Acid Concentrations Below Tech Spec Limit of 20,100 Ppm.Caused by Dilution of Tanks During Recovery from Safety Injection.Tanks Returned to Specs (← links)
- 05000311/LER-1983-027-03, /03L-0:on 830604,during 18-month Surveillance of Fuel Handline Area Ventilation Sys,Charcoal Absorber Failed Freon Test.Caused by Saturation from Water Vapor Due to Humid Fuel Storage Atmosphere.Study Underway (← links)
- 05000311/LER-1983-028-03, /03L-0:on 830607,discovered That Auxiliary Bldg Ventilation Sys Charcoal Absorber Failed Freon Test Due to Absorber Degradation.Caused by Refrigeration Coolant Leaks & Leakage from Freon Decontamination Unit (← links)
- 05000272/LER-1983-028-03, /03L-0:on 830606,control Room Operator Observed Pressurizer Backup & Control Heaters Deenergized.Caused by Failure of Control Relay for Oil Heater Trip Function.Relay Coil Replaced (← links)
- 05000272/LER-1983-027-03, /03L-0:on 830602,hydrogen Analyzer 12 Chart Recorder Tailed Offscale High.Caused by Line Voltage Transient on Vital Instrument Bus 2B,causing Instrument Microprocessor to Lose Contents (← links)
- 05000272/LER-1983-025-03, /03L-0:on 830525,containment Air Particulate Monitor Indicated Alarm Condition W/O Receiving Purge/Pressure Relief Isolation Function.Caused by Channel Output Alarm Relay Wire Ball Out of Place (← links)
- 05000311/LER-1983-025-03, /03L-0:on 830524,RHR Pump & Fuel Handling Bldg Exhaust Fan 21 Tripped.Caused by Floating Logic Line & Internal Circuitry Noise in Safeguards Equipment Control Sys.Testing Design Change Issued (← links)
- 05000272/LER-1983-017-03, /03L-0:on 830215,containment Sump Pumps 11 & 12 Found Running Continuously.To Prevent Damage,Pumps de-energized & Tagged Out.Caused by Level Detector LD-7749 Malfunctioning Due to Binding in Magnetic Sleeve Assembly (← links)
- 05000272/LER-1983-016-03, /03L-0:on 830211,containment Air Particulate Monitor Indicated off-scale Low.Caused by Signal Lead to Scintillation Detector Open in Detector Cable Connector. Cable Apparently Strained During Maint.Connector Replaced (← links)
- 05000311/LER-1983-016-04, /04L-0:on 830418 & 22,small Amounts of Low Level Liquid Radwaste Released to util-controlled Area from Waste Monitoring Tank 21.Caused by Leakage from Liquid Waste Sys Components.Valve 1LW13 Flange Tightened (← links)
- 05000311/LER-1983-010-03, /03L-0:on 830126,during Shutdown Operations, Control Air Header 21 Isolated & Tagged for Leak Rate Testing.Porv 2PR1 Closed Resulting in Loss of RCS Vent Path. Caused by Surge in Header 22 Due to Failed Valve (← links)
- 05000311/LER-1983-009-03, /03L-0:on 830203,during Shutdown Operation,Sample Analysis of RCS Boron Concentration Revealed Concentration Less than Tech Spec Limit.Caused by Hydrolazing Steam Generators.Rcs Boration Performed to Maintain Concentration (← links)
- 05000311/LER-1983-007-01, /01T-0:on 830210 & 11,during Routine Surveillance Testing,Two Steam Generator Snubbers Failed to Meet Acceleration & Bleed Test Requirements.Caused by Aging of Snubber Piston Seal Rubber Matl.Seals Will Be Rebuilt (← links)
- 05000272/LER-1983-013-99, /99T-0:on 830215,calculated Moderator Temp Coefficient (Mtc) Value for All Control Rods Withdrawn Found More Positive than Tech Spec Allowance But within Expected Deviation.Limitation on Withdrawal Will Be Maintained (← links)
- 05000272/LER-1983-007-03, /03L-0:on 830129,control Room Operator Discovered Low Flow Through Number 14 Reactor Coolant Loop Resistance Thermometer Detector Bypass.Caused by Obstruction in Hot Leg Flowpath.Hot Leg Cycled & Bypass Flow Restored to Norm (← links)
- 05000311/LER-1983-008-99, /99X-0:on 830218,diesel Generator Area Low Pressure Carbon Monoxide Sys Automatic Initiation Feature Disabled & Tagged Out for Planned Maint.Continuous Fire Watch Established.On 830131,event Became Reportable (← links)
- 05000272/LER-1983-006-03, /03L-0:on 830126 & 28 Nonseismically Qualified Components & Power Boxes Discovered Installed in Dc Control Power Feeds to Emergency Diesel Generators.Caused by Personnel Oversight.Power Box Components Replaced (← links)
- 05000311/LER-1983-003-03, /03L-0:on 830111,rod Position Indicator Channel 1SA2 Indicated Approx Half Scale,Contrary to Flux Map Indication That No Change in Rod Position Occurred.Caused by Failed Signal Conditioner.Module Replaced (← links)
- 05000272/LER-1983-012-01, /01T-0:on 830222,during Startup,Reactor Manually Tripped.Caused by Rapidly Decreasing Steam Generator Levels. Manual Trip Obscured Failure of Trip Breakers to Open Automatically.Plant Cooldown Commenced (← links)
- 05000272/LER-1983-015-03, /03L-0:on 830210,during Surveillance Testing of Diesel Generator 1A,jacket Water High Temp Alarm Received. Caused by Missing Handwheel on Flow Transmitter High Side Isolation Valve.Handwheel Replaced (← links)
- 05000272/LER-1983-010-03, /03L-0:from 821016-830205,during Testing of Type B & C Components,Three Containment Isolation Valves Exhibited Leakage Rates in Excess of Test Equipment Range. Valves 1CC215 & 1VC8 Restroked.Valve 14GB4 Reworked (← links)
- 05000272/LER-1983-014-03, /03L-0:on 830209,auxiliary Alarm Typewriter Failed.Caused by Failed Circuit Board in Auxiliary Annunciator Sys.Board Replaced & Separate Annunciators for Sump Sys Being Installed (← links)
- 05000311/LER-1983-001-03, /03L-0:on 830106,reactor Trip Breaker a Failed to Open Following Reactor Trip.Caused by Malfunctioning Breaker Undervoltage Relay Due to Binding of Relay Mechanism by Dirt or Corrosion.Breaker Replaced.Periodic Insp Initiate (← links)
- 05000272/LER-1983-002-01, /01T-0:on 830106,station Power Transformer 12 de-energized for Planned Maint.Loss of Power to Automatic Starting Feature on Both Diesel Fire Pumps Resulted.Caused by Oversight Due to Human Error.Personnel Counseled (← links)
- 05000272/LER-1983-001-03, /03L-0:on 830104,vital Bus 1B Tripped,Rendering RHR Loop Inoperable.Caused by Differential Relay Protection. Redundant RHR Loop Immediately Placed in Operation (← links)
- 05000272/LER-1983-035-03, /03L-0:on 830731 & 0812,100-ft Elevation Containment Air Lock Declared Inoperable.Door Failed Surveillance Testing Due to Leakage & Damaged Seal on Inner Door.Caused by Rapid Operation of Door (← links)
- 05000311/LER-1983-040-03, /03L-0:on 830727,Tavg Decreased Slightly Below Tech Spec Limit for Critical Operation.Caused by Manual Addition of Feedwater to Steam Generators.Temp Returned to within Spec.Operator Involved Reinstructed (← links)
- 05000311/LER-1983-021-01, /01P:on 830525,vital Instrument Bus Inverter 2C Taken Out of Svc for Planned Maint,Rendering Associated Ac Electrical Bus Train Inoperable.Containment Air Locks Could Not Be Closed During Maint.Investigation Underway (← links)
- 05000311/LER-1983-022-01, /01P:on 830530,during Routine Shutdown Operation, Loss of Power Occurred,Rendering Ac Electrical Bus Train Inoperable.Investigation in Progress.Detailed Rept Will Be Submitted within 14 Days (← links)
- 05000311/LER-1983-026-04, /04L-0:on 830529,diesel Fuel Oil Storage Tanks Overfilled Resulting in Release of Approx 200 Gallons of Oil Into Delaware River.Spill Contained W/Booms.Caused by Operator Error (← links)
- 05000272/LER-1983-021-03, /03L-0:on 830507,emergency Diesel Generator 1A Tagged Out Due to Broken Differential Current Relay.Caused by Personnel Accidentally Breaking Glass Relay Cover.Relay Cleaned (← links)
- 05000272/LER-1983-022-04, /04L-0:on 830513,estimated 131 Uci of Activity Released When 350 Gallons Low Level Radioactive Water Pumped Into Ground.Caused by Contaminated Piping Penetration Area. Control Measures Implemented (← links)
- 05000311/LER-1983-024-03, /03L-0:on 830514 & 15,RHR Sys Suction Valve Closed,Eliminating Flow in Operating RHR Loop.Caused by Deenergized Vital Instrument Bus 2B & Failure of Comparator 2PC-405A-B,respectively.Comparator Replaced (← links)
- 05000272/LER-1983-020-03, /03L-0:on 830506,pins Found Installed in Two Spring Hangers Supporting Resistance Temp Device Bypass Lines.Hanger Pins Removed & Tested & Procedure Developed for Lead Shielding Installation (← links)
- 05000311/LER-1983-020-03, /03L-0:on 830512,senior Shift Supervisor Notified That Control Room Emergency Air Conditioning Sys Design Not Consistent W/Tech Spec Surveillance Requirement 4.7.6.1.0.3. License Change to Be Submitted (← links)
- 05000311/LER-1983-014, Forwards LER 83-014/03L-0.Detailed Event Analysis Encl (← links)
- 05000311/LER-1983-006-04, /04L-0:on 830408,decreased Sensitivity of Channel 2R41C Plant Vent Noble Gas Monitor Rendered Waste Gas Discharge Line Automatic Isolation Feature Inoperable.Caused by Leakage on Monitor Sample Lines & Internal Connections (← links)
- 05000311/LER-1983-006, Forwards LER 83-006/04L-0.Detailed Event Analysis Encl (← links)
- 05000272/LER-1983-019, Forwards LER 83-019/03L-0.Detailed Event Analysis Encl (← links)
- 05000311/LER-1983-014-03, /03L-1:on 830413 & 18,operating Loads on 2A 4kV & 460-volt Vital Buses Observed to Trip.Caused by Spurious Operation of Safeguards Equipment Control Sys Due to Design Deficiencies.Equipment Restarted (← links)
- 05000311/LER-1983-005, Forwards LER 83-005/03L-0.Detailed Event Analysis Encl (← links)