Pages that link to "05000389/LER-2007-001, Regarding Reactor Shutdown Due to Unidentified RCS Leakage"

The following pages link to 05000389/LER-2007-001, Regarding Reactor Shutdown Due to Unidentified RCS Leakage:

Displayed 6 items.

• 05000389/LER-2007-001 (redirect page) ‎ (← links)
  • 05000529/LER-2007-004 ‎ (← links)
  • 05000389/LER-2005-001 ‎ (← links)
  • 05000315/LER-2007-002 ‎ (← links)
  • 05000413/LER-2007-004 ‎ (← links)
  • 05000389/LER-2001-001 ‎ (← links)
  • 05000346/LER-2007-001 ‎ (← links)
  • 05000335/LER-2007-003 ‎ (← links)
  • 05000309/LER-2007-001 ‎ (← links)
  • 05000266/LER-2007-002 ‎ (← links)
  • 05000389/LER-1983-006, Submits Supplemental Info to LER 83-06 Re Safety Injection Sys Vent/Drain Vibration Restraints.Field Insp Program,Field Vent/Drain Insp & Plant Change/Mod Procedure Initiated.Info to Be Included in Revised LER ‎ (← links)
  • 05000389/LER-1983-001, Forwards LER 83-001/01T-0 ‎ (← links)
  • 05000389/LER-1986-007, Forwards Response to NRC 861001 Request for Addl Info Surrounding Event Reported in LER 86-007 Re Inoperable Pressurizer Safety Valves ‎ (← links)
  • 05000389/LER-2024-003, Unplanned Reactor Scram ‎ (← links)
  • 05000389/LER-2024-002-01, Safety Injection Tank Vent Through Wall Leakage ‎ (← links)
  • 05000389/LER-2024-002, Safety Injection Tank Vent Through Wall Leakage ‎ (← links)
  • 05000389/LER-2024-001, Safety Injection Tank Vent Through Wall Leakage ‎ (← links)
  • 05000389/LER-2022-001, Reactor Shutdown Required by Technical Specifications Due to a Misaligned Control Element Assembly ‎ (← links)
  • 05000389/LER-2021-002, Foreign Material Exclusion Device Found in Containment Spray System ‎ (← links)
  • 05000389/LER-2021-001, Automatic Reactor Trip Due to a Breaker Failure on the 2B2 480V Motor Control Center ‎ (← links)
  • 05000389/LER-1986-013-02, :on 860915,while at Full Power,Turbine Trip Actuated Reactor Trip on Loss of Load.Caused by Failure to Place Containment Sump Recirculation Channel Back in Svc Before Mode Change.Operator Counseled ‎ (← links)
  • 05000389/LER-1986-012-02, :on 860819,audit Revealed That Emergency Battery Surveillance Performed on 860613 Deficient Due to Two Individual Cell Voltages Recorded at 2.09 V Below Tech Spec Corrected Voltage.Procedure Revised ‎ (← links)
  • 05000389/LER-1987-004-03, :on 870422,turbine & Reactor Trips Occurred Due to Loss of nonsafety-related Load Ctr.Caused When Maint Personnel Jumped Wrong Terminals During Ammeter Calibrs. Personnel Counseled & Wiring Problem Corrected ‎ (← links)
  • 05000389/LER-1986-014-01, :on 861008,discovered Surveillance Interval for Hot Shutdown Control Panel Instrumentation Exceeded.Caused by Personnel Error.Departmental Surveillance/Testing Schedule Procedure Implemented ‎ (← links)
  • 05000389/LER-1986-001, :on 860107,unit Manually Tripped Due to Turbine Cooling Water Leak in Main Generator Exciter Housing.Unit Also Tripped on Local Power Density.Caused by Wear Hole in Drain Line & Personnel Error.Drain Line Fixed ‎ (← links)
  • 05000389/LER-1986-009-02, :on 860522,containment Bypass Leak Rate Exceeded Tech Spec 3.6.1.2(c) Limits.Caused by Degraded Disc in Outside Containment Isolation Valve.Disc Replaced & Bypass Leak Rate Retested Successfully ‎ (← links)
  • 05000389/LER-1986-005-02, :on 860310,discovered That Time Limit for Performance of Semiannual ESF Sys Relay Surveillance Exceeded.Caused by Failure to Assign Tracking Responsibility to Any Dept.Operations Dept Assigned Tracking ‎ (← links)
  • 05000389/LER-1986-010-02, :on 860604,reactor Trip Occurred Due to Low Steam Generator Water Level.Caused by Ineffective Manual Control of Steam Generator Water Levels During Low Power Operations.Control Room Operators Counseled ‎ (← links)
  • 05000389/LER-1986-008-02, :on 860428,hourly Fire Watch Not Conducted for 24 H of Contractor Bargaining Unit Personnel Walkout.Caused by Cognizant Personnel Error.Procedure Re Request to Breach Fire Barrier Will Be Revised ‎ (← links)
  • 05000389/LER-1986-007-02, :on 860417,while Refueling,Two of Three Pressurizer Code Safety Valves (AB) Failed to Lift When Bench Tested.Caused by Excessive Binding from Corroded Carbon Steel Components.Valves Rebuilt ‎ (← links)
  • 05000389/LER-1986-002-02, :on 860111,reactor Trip Initiated by Inadvertent Manual Turbine Trip During Turbine Overspeed Testing.Caused by Operator Error.Turbine Trip Lever Painted Red to Be Distinguished from Test Lever ‎ (← links)
  • 05000389/LER-1986-001-01, :on 860107,unit Manually Tripped Due to Turbine Cooling Water (Kb) Leak in Main Generator Exciter Housing. Caused by Installation Error.Leak Repaired.Operating Procedure Revised ‎ (← links)
  • 05000389/LER-1986-004-02, :on 860210,discovered That Max Allowable Time Interval Exceeded for 31-day in-core Alarm Setpoint Surveillance.Caused by Personnel Error.Surveillance Performed ‎ (← links)
  • 05000389/LER-1983-015-03, /03L-0:on 830527,during Preoperational Testing, Both 4,160-volt safety-related Buses 2A3 & 2B3 Deenergized. Caused by Tie Breakers Being Tripped as Operator Opened Cubicle Door & Switch Gears Cleaned ‎ (← links)
  • 05000389/LER-1983-017-03, /03L-0:on 830527,during Preoperational Testing, Instrument Inverter Mb Briefly Deenergized.Caused by Operator Opening Inverter Supply Breaker by Mistake.Power to Inverter Restored ‎ (← links)
  • 05000389/LER-1986-003, :on 860113,25% Allowed Time Extension for Performance of Monthly Auxiliary Feedwater Actuation Logic Surveillance Exceeded.Caused by Personnel Error.Logic Surveillance performed.W/860211 1tr ‎ (← links)
  • 05000389/LER-1985-010-03, :on 851226,individual Control Element Assembly Declared Inoperable Causing Reactor Shutdown.Caused by Failure of Upper Gripper Coil.Coil Installed & Operators Counseled ‎ (← links)
  • 05000389/LER-1985-007-02, :on 850718,reactor Trip Occurred at 99% Power in Mode 1 When MSIV Closed.Caused by Error in Dc Ground Isolation Procedure.Rev to Procedure & Review of safety- Related Sys Circuits & MSIV Relay Sys Underway ‎ (← links)
  • 05000389/LER-1985-008-02, :on 850808,reactor Trip Occurred When MSIVs Closed by Spurious Side a ESF Actuation Signal.Caused by Personnel Error.Plant Stabilized & RCS Cooldown Commenced for Reactor Coolant Pump Seal Replacement ‎ (← links)
  • 05000389/LER-1985-009-02, :on 850910,high Vibrations Occurred on Reactor Coolant Pump 2A2,causing Manual Trip.Caused by Pump Vibration Permitting Oil Slinger Ring to Break Free & Damaged Oil Seal in Oil Reservoir ‎ (← links)
  • 05000389/LER-1983-012-03, /03L-0:on 830523,during Preoperational Testing, PORV Position Indicator Lights Discovered to Be Out.Caused by Failed Magnetic Slug on Valve Stem.New Magnet W/Annealed Metal Used as Replacement ‎ (← links)
  • 05000389/LER-1985-003-03, :on 850417,reactor Manually Tripped.Caused by Spurious close-intercept-valve Signal Generated by Technician.Plant Stabilized in Hot Shutdown & Digital Electrohydraulic Sys Evaluated ‎ (← links)
  • 05000389/LER-1985-006-02, :on 850516,two Control Element Assemblies in Subgroup 12 Dropped.Caused by Personnel Error in Pulling Wrong Circuit Card During Maint.Personnel Informed of Error & Greater Caution Will Be Exercised in Future ‎ (← links)
  • 05000389/LER-1985-005-02, :on 850509,during Periodic Surveillance, Inadvertent Actuation of ESF for Containment Sump Recirculation Experienced.Caused by Faulty Switch in Channel MD Test Circuit.Switch Replaced ‎ (← links)
  • 05000389/LER-1985-001-02, :on 850408,reactor Trip Occurred as Result of Low Steam Generator Level.Caused by Ineffective Communication Between Control Room Operators During Power Ascension.Ler Disseminated to Operations Staff ‎ (← links)
  • 05000389/LER-1985-002-02, :on 850408,reactor Trip Occurred When Main Feedwater Block Valve 2A Opened.Caused by Personnel Error. Startup Procedure Will Be Revised to Include Visual Verification of Proper Valve Operation ‎ (← links)
  • 05000389/LER-1984-016-02, :on 841219,turbine/reactor Trip Occurred on Low Vacuum Due to Condensate Pump 2B Recirculation Line Crack. Cause Not Stated.Recirculation Line,Breaker & Reactor Coolant Pressure Seals Replaced ‎ (← links)
  • 05000389/LER-1984-015-02, :on 841218,reactor Trip Occurred Due to Low Steam Generator Level.Caused by Poor Suction Strainer Venting Technique ‎ (← links)
  • 05000389/LER-2020-001, Turbine Loss of Load Trip Found Outside Technical Specification Allowable Range Due to Unspecified Legacy M&TE or Calibration Deficiencies ‎ (← links)
  • 05000389/LER-1984-014-02, :on 841129,while at 68% Power,Esf Channel a Actuated Due to Blown Fuse.Cause of Blown Fuse Unknown.Fuse & Diode Replaced ‎ (← links)
  • 05000389/LER-1984-011-03, :on 841121,reactor Tripped Due to Loss of Turbine Load & Auxiliary Feed Pump C Tripped on Overspeed. Caused by Generator Exciter Bearing Failure & Steam Leakage, Respectively.Bearing Replaced ‎ (← links)
  • 05000389/LER-1984-010-03, :on 841119,inservice Insp Surveillance Requirements of Tech Spec 4.7.9 Performed & 19 Snubbers Declared Inoperable as Result.All Inoperable Snubbers Replaced or Repaired ‎ (← links)
  • 05000389/LER-1984-017-02, :on 841225,while in Hot standby,2A1 SIT Outlet Check Valve Leaked,Permitting HPSI Flow to Be Diverted Into Safety Injection Tank Instead of 2AI Loop ‎ (← links)
  • 05000389/LER-1984-012-02, :on 841119,manual Trip Occurred After Seizure of Condensate Pump 2C.Caused by Impeller Failure ‎ (← links)
  • 05000389/LER-1984-009-03, :on 841104,during Scheduled Refueling Outage, Containment Isolation Signal Inadvertently Actuated ‎ (← links)
  • 05000389/LER-1984-008-03, :on 841030,train a Control Room Emergency Ventilation Sys Did Not Meet Tech Spec Requirements.Caused by Removal of Block Devices Installed on Damper Linkage During Preoperational Testing ‎ (← links)
  • 05000389/LER-1984-007-03, :on 841024,during Refueling Outage,Containment Isolation Signal Actuation Received.Caused by Improper Calibr of One Containment Radiation Monitor.Channel Calibr ‎ (← links)
  • 05000389/LER-1984-006-03, :on 841014,operators Could Not Obtain Reading of Auxiliary Feedwater (AFW) Flow to Steam Generator B from AFW Pump B.Caused by Stem Separating from Plug on AFW Valve. Investigation Continuing ‎ (← links)
  • 05000389/LER-1984-005-02, :on 840830,reactor Trip Occurred During Monthly Auxiliary Feedwater Actuation Signal Functional Test.Caused by Unexpected Closing of Train a Feedwater Isolation Valve Due to High Resistance Across Relay Contact ‎ (← links)
  • 05000389/LER-1984-004-01, :on 840209,while at 100% Power,Main Feedwater Pump Tripped Due to Low Suction Pressure.Cause Not Determined.Auxiliary Feedwater Pump 2C Tripped Due to Transients on Power Supply.Nut Pin Replaced ‎ (← links)
  • 05000389/LER-1984-001-01, :on 840119,while at 100% Power,Turbine & Reactor Tripped.Caused by Generator Ground & Potential Transformer Drawer Disconnect Contacts Misaligned.Contacts Realigned ‎ (← links)
  • 05000389/LER-1983-076-03, /03L-0:on 831202,while at 100% Power,Fire Detection Sys Failed for 3 H.Caused by Defective Transceiver Card.Honeywell Card Replaced ‎ (← links)
  • 05000389/LER-1983-075-03, /03L-0:on 831124,while at 100% Power,Fire Doors Found Open.Doors Open Primarily During Const.Continuous Fire Patrol Instituted ‎ (← links)
  • 05000389/LER-1983-074-03, /03L-0:on 831123,during Normal full-power Operation,Both Plant Data Processing Computer & Backup Failed.Cause of First Computer Failure Unknown.Backup Computer Failed Due to Program Error ‎ (← links)
  • 05000389/LER-1983-073-03, /03L-0:on 831114,while in Mode 1,outer Door on Escape Airlock Opened.Caused by Personnel Misunderstanding. Personnel Involved Counseled as to Importance of Adhering to Tech Spec Requirements ‎ (← links)
  • 05000389/LER-1983-072-03, /03L-0:on 831116,during Full Power Operation, Personnel Airlock Failed Leak Test Surveillance.Airlock Equalizing Valve Flange Bolts Found Loose.Cause Unidentified.Bolts Tightened within 1 H ‎ (← links)
  • 05000389/LER-1983-070-03, /03L-0:on 831108,while at 100% Power,Main Valve HCV-09-1A Found Inoperable Due to Loss of Nitrogen Press in Hydraulic Accumulators.Caused by Nitrogen Leaking Through Tubing connection.HCV-09-1A Repaired ‎ (← links)
  • 05000389/LER-1983-071-03, /03L-0:on 831108,two Pinhole Leaks Noted on Charging Pump 2B Discharge Valve.Cause Unknown.Valve & Section of Line Replaced ‎ (← links)
  • 05000389/LER-1983-069-03, /03L-0:on 831027,while Performing Periodic Control Element Assembly (CEA) Exercise,Cea 86 Dropped to Full Insertion.Caused by Control Element Drive Mechanism Failure to Close Upper Gripper ‎ (← links)
  • 05000389/LER-1983-068-03, /03L-0:on 831015,fire Doors Found Open.Caused by Const in Progress.Continuous Fire Patrol Established ‎ (← links)
  • 05000389/LER-1983-067-03, /03L-0:on 831006,diesel Generator 2 B Fuel Oil Transfer Pump Failed to Start.Caused by Loose Impeller Seizing Pump Due to Improper Sleeve/Drive Pin Lineup.Pump Rebuilt ‎ (← links)
  • 05000389/LER-1983-064-03, /03L-0:on 831013,input Breaker to MD Inverter Tripped Open When Shifting from Bb to B Charger by Tripping Bb.Cause Unknown.High Dc Voltage Trip Reset to High Side of Spec ‎ (← links)
  • 05000389/LER-1983-066-03, /03L-0:on 830926,power Channel C Feedwater Header Pressure Indication Failed.Caused by Failed Amplifier Circuit Board in PT-09-9C,Rosemount Model 1153 GB9 Pressure Transmitter.Board Replaced ‎ (← links)
  • 05000389/LER-1983-060-03, /03L-0:on 830926,welding Repeatedly Actuated Zone 20 Sprinkler Solenoid Valve F2 & Valve Failed.Caused by Repeated Inadvertent Actuation & Actuation Valve Reset. Fire Watch Established ‎ (← links)
  • 05000389/LER-1983-065-03, /03L-0:on 830926,one of Two RCS Cold Leg Temp Monitoring Channels at Remote Shutdown Panel Determined Inoperable.Caused by Loose Resistance Temp Device Connection on Terminal Board.Connector Tightened ‎ (← links)
  • 05000389/LER-1983-059-03, /03L-0:on 830925,channel Check Surveillances for Main Steam Relief Valve Radiation Monitors & Steam Generator Blowdown Effluent Monitors Not Performed.Caused by Loss of Control Room Indication Due to Lightning ‎ (← links)
  • 05000389/LER-1983-063-03, /03L-0:on 830924,containment Gaseous Monitor Failed.Caused by Lightning Strike Scrambling Logic Circuits & Data Base.Logic Restored ‎ (← links)
  • 05000389/LER-1983-057-03, /03L-0:on 830921,while Increasing Power,Channel C Hot Leg Temp Instrumentation B Failed.Caused by Intermittent Grounds on Rdf Corp Resistance Temp Device (Rtd).Rtd Input Removed from Circuit ‎ (← links)
  • 05000389/LER-1983-062-03, /03L-0:on 830922,while at 50% Power,Control Element Assembly 18 Dropped to Core Bottom.Control Element Aligned W/Group within 7 Minutes.Cause Not Determined. Vendor Review in Progress ‎ (← links)
  • 05000389/LER-1983-061-03, /03L-0:on 830923,control Element Assembly Slipped Three Times During Normal Startup.Cause Unknown.Nsss Vendor Review of Integrated Drive Sys Continuing ‎ (← links)
  • 05000389/LER-1984-002-01, :on 840130,hydrogen Analyzer 2B & Control Room Air Conditioner HVA-3A Unavailable for Mode Changes as Required by Tech Specs.Caused by Improper Review & Recordkeeping.Personnel Reinstructed ‎ (← links)
  • 05000389/LER-1984-003-01, :on 840129,hi-hi Steam Generator Level Turbine Trip Occurred,Resulting in Reactor Trip.Caused by Leakage Through Main Feed Regulating Valve A.Reactor Started & Plant Returned to Svc ‎ (← links)
  • 05000389/LER-1983-051-03, /03L-0:on 830822,instrument Ft 3306 Train a Shutdown Cooling Flow Failed.Cause Unkown.Calibr Checks Made of Associated Sigma & controller.FT-3306 Valved Out & Back Into Svc ‎ (← links)
  • 05000389/LER-1983-050-03, /03L-0:on 830822,during Power Operation,Train a & B Containment Particulate Iodine & Gaseous Monitors Inoperable.Caused by Filter Paper Stuck on Instrument Sensor.Papers Freed from Sensors & Realigned ‎ (← links)
  • 05000389/LER-1983-049-01, /01T-0:on 830911,while Performing Valve Lineup Checks for Startup,Svc Air Containment Isolation Valves V28794 & V18796 Found Open.Caused by Personnel Error.Valves Shut ‎ (← links)
  • 05000389/LER-1983-046-03, /03L-0:on 830819,after Unit Startup,Fire Doors Found Open on Numerous Occasions Due to Contractor Work Being Performed.Procedure Revised to Ensure Corrective Action Will Be Initiated ‎ (← links)
  • 05000389/LER-1983-045-03, /03L-0:on 830817,neutron Flux Indication B on Hot Shutdown Panel Failed.Caused by Broken Wire on Feedback Wiper.Wire Repaired ‎ (← links)
  • 05000389/LER-1983-047-03, /03L-0:on 830810,plant Data Processing Computer & Backup Computer Tripped Offline,Rendering Pulse Counting CEA Position Indication & in-core Power Detection Sys Inoperable.Caused by Disc Errors ‎ (← links)
  • 05000389/LER-1983-023-03, /03L-0:on 830617,during Startup Operations,Control Element Assembly 45 Slipped Greater than 7 Inches from Group & Dropped to Bottom During Withdrawal.Investigation Conducted.Cause Unknown ‎ (← links)
  • 05000389/LER-1983-024-03, /03L-0:on 830615,during Power Ascension Testing, RCS Inventory Balance Surveillance Not Performed.Caused by Unstable Conditions Associated W/Power Ascension Testing. Inventory Balance Subsequently Performed ‎ (← links)
  • 05000389/LER-1983-009-03, /03L-0:on 830514,while in Mode 3,hot Standby, Personnel Airlock Was in Use & Outer Equalizing Valve Did Not Shut.Airlock Declared Inoperable.Caused by Broken Equalizing Valve.Broken Piece Repaired ‎ (← links)
  • 05000389/LER-1983-077-03, /03L-0:on 831221,diesel Generator 2B Failed to Start within 10 & Fuel Oil Day Tank Failed to Automatically Fill Above 30% Level.Cause for Slow Start Not Determined.Tank Holding Relay Module Replaced ‎ (← links)
  • 05000389/LER-1983-053-03, /03L-0:on 830909,while in Hot Shutdown,Containment Pressure Exceeded 0.4 Psig Limit.Caused by Heatup & High Pressure.Pressure Released by Purge After Obtaining Waste Gas Release Permit ‎ (← links)
  • 05000389/LER-1983-056-03, /03L-0:on 830907,w/shutdown Cooling (SDC) Train 2B in Operation,Sdc Train 2A in Injection Mode & Loop B Reactor Coolant Pumps Inoperable,Loop a Pumps Made Inoperable.Caused by Erroneously Racking Out Pumps ‎ (← links)
  • 05000389/LER-1983-055-31, /03L-0:on 830910,wide Range Nuclear Instrumentation C Failed.On 830912,channel D Failed.Caused by Failure of Decade Dividers in Log Countrate Cards.Parts Replaced ‎ (← links)
  • 05000389/LER-1983-058-03, /03L-0:on 830914,during 100% Power,Fire Doors Found Open.Caused by Const Activities.Continuous Fire Patrol Watch Observed Since Startup ‎ (← links)
  • 05000389/LER-1983-048-03, /03L-0:on 830816,Channel a Qualified Safety Parameter Display Sys Subcooled Margin Monitor Failed. Caused by Feedback of Noise from Plasma Display Unit Tripping Computer.Trips Reset ‎ (← links)
  • 05000389/LER-1983-033-03, /03L-0:on 830704,position Indication Lights for PORV 1475 Discovered Out.Caused by Valve Stem Magnetic Slug Failure.New Magnet Installed ‎ (← links)
  • 05000389/LER-1983-031-03, /03L-0:on 830624,hot Shutdown Control Panel Steam Generator a Narrow Range Level Indication Failed. Caused by Failure of Level Transmitter.Transmitter Replaced ‎ (← links)
  • 05000389/LER-1983-028-03, /03L-0:on 830624,position Indicator Channels Declared Inoperable When Control Element Assemblies 44 & 22 Appeared to Slip.Caused by Erroneous Indications Due to Mismatched Impedance.Computer Leads Lifted ‎ (← links)
  • 05000389/LER-1983-032-03, /03L-0:on 830623,channel a wide-range Nuclear Instrumentation Failed.Caused by Failure of Log Count Rate Circuit Board LCR-1 Mfg by Electro Mechanic.Board Replaced ‎ (← links)
  • 05000389/LER-1983-030-03, /03L-0:on 830610,channel D Low Component Cooling Water Reactor Coolant Pumps Spuriously Started Causing Timing to Trip.Caused by Spikes from Flow Transmitter. Transmitter Vented ‎ (← links)
  • 05000389/LER-1983-029-03, /03L-0:on 830610,while Performing Power Ascension Testing,Auxiliary Feedwater Pump C Failed to Reach Rated Speed.Caused by Erroneous Electrical Overspeed Trips Due to Noise Seen by Air Pax Series 300 Tachometer ‎ (← links)
  • 05000389/LER-1983-043-03, /03L-0:on 830730,during Power Ascension Testing, While at 80% Power & W/Charging Pump 2C Out of Svc for Maint,Pump 2B Declared Out of Svc.Caused by Pump Accumulator Dampener in Low Nitrogen Pressure Condition ‎ (← links)
  • 05000389/LER-1983-011-03, /03L-0:on 830510,during Precritical Testing, Initial Performance of Tech Spec Surveillance Found Three Valve Motor Operators Missing Thermal Overload Bypass Switches.Caused by Design Error.Design Changed ‎ (← links)
  • 05000389/LER-1983-010-03, /03L-0:on 830511,power Lost to Side B Vital & Nonvital Buses.Caused by Opening Incorrect Breaker at Distribution Switchyard.Personnel Instructed on Importance of Proper Switching ‎ (← links)
  • 05000389/LER-1983-040-03, /03L-0:on 830718,during 50% Power,Qa Plasma Display Sys a Failed.Caused by Plasma Display Unit Failure.Unit Replaced & Satisfactorily Tested ‎ (← links)
  • 05000389/LER-1983-039-03, /03L-0:on 830728,following Loss of Offsite Power W/Reactor Shut Down,Auxiliary Feedwater Pump 2C Tripped Three Times.Caused by Attempting to Manually Start Pump.No Cause Identified ‎ (← links)
  • 05000389/LER-1983-038-03, /03L-0:on 830712,during Startup Operations,Control Element Assemblies 54 & 17 Slipped Greater than 15 Inches from Groups During Withdrawal.Cause Unknown.Investigation Underway ‎ (← links)
  • 05000389/LER-1983-005-01, /01T-0:on 830507,while Reviewing Plant Status Following Mode Change to Hot Shutdown,Discovered Safety Injection Tanks Had Remained Isolated.Caused by Personnel Error.Operators Counseled on Procedures ‎ (← links)
  • 05000389/LER-1983-002-03, /03L-0:on 830421,while in Mode 6,refueling Bus Tie Breaker 2A2 & 2A3 Opened,Deenergizing Bus 2A3 & Causing Loss of Low Pressure Safety Injection Pump A.Caused by Shorted Contact Due to Personnel Error.Bus 2A3 Restored ‎ (← links)
  • 05000389/LER-1983-004-03, /03L-0:on 830424,during Initial Fill & vent,wide- Range Pressure Indicator Discovered Reading Zero Psig.Caused by Erroneously Isolated Pressure Transmitter,Rendering PORV Inoperable.Valve Lineup Performed Successfully ‎ (← links)
  • 05000389/LER-1983-036-03, /03L-0:on 830714 & 18,personnel Airlock Outer Door Seal Failed Routine Leak Test Surveillance.Caused by Improper Seating of Door Seal.Operating Mechanism Adjusted ‎ (← links)
  • 05000389/LER-1983-035-03, /03L-0:on 830712,two of Four Safety Injection Tanks Depressurized to Min Tech Spec Limit During Initial Power Ascension Testing.Cause Not Absolutely Determined. Depressurization Via V-3466 Suspected ‎ (← links)
  • 05000389/LER-1983-034-03, During Startup Testing, Automatic Bypass Removal for Four Steam Generator Low Pressure Trip Channels Set Nonconservatively.Caused by Procedural Error.Procedure Corrected ‎ (← links)
  • 05000389/LER-1983-001-01, /01T-0:on 830416,during Fuel Movement,Both Emergency Generators Discovered out-of-svc.Caused by Personnel Error in Establishing Out of Svc Log.Logs Reviewed & Periodic Surveillance Procedure Revised ‎ (← links)
  • 05000389/LER-1983-027-03, /03L-0:on 830608,during Power Ascension Testing,W/ One High Radiation Containment Isolation Sys Channel in Bypass,Another High Radiation Channel Failed Low.Caused by Bistable Drifting low.W/83707 Ltr ‎ (← links)
  • 05000389/LER-1983-022-03, /03L-0:on 830606,waste Gas Decay Tank 2B Contained Explosive Mixture.Caused by out-of-adjustment Nitrogen Regulators & Slightly Opened Vent Valve.Vent Valve Closed & Nitrogen Regulators Adjusted ‎ (← links)
  • 05000389/LER-1983-014-03, /03L-0:on 830522,main Feed Water Isolation Valve B Drifted Open Twice.Caused by Thermal Relief Orifice Installed in Hydraulic Line to Top of Actuator.Thermal Relief Orifice in Hydraulic Sys Plugged ‎ (← links)
  • 05000389/LER-1983-016-03, /03L-0:on 830527,during Preoperational Testing,Two of Three Charging Pumps Inoperable for Approx 15 H.Caused by Sealwater Sys Gasket Leak & Charging Pump Relief Valve Failure.Pumps Repaired & Retested ‎ (← links)
  • 05000389/LER-1983-013-03, /03L-0:on 830520,while Leak Testing Escape Airlock,Excessive Leak Rate Detected.Caused by Linkages for Inner & Outer Door Equalizing Valves Being Slightly Out of Adjustment.Linkages Readjusted ‎ (← links)
  • 05000389/LER-1983-008-03, /03L-0:on 830514,while in Mode 3,operator Observed All Position Indication Lights on PORV 1475 Were Out.Caused by Loss of Magnetic Property to Magnet on Valve Shaft Due to High Temps in Environs.Magnet Replaced ‎ (← links)
  • 05000389/LER-1983-007-03, /03L-0:on 830428,during Cold Shutdown,Porv 1474 Failed to Open at Required Pressure.Cause Not Determined.Sys Pressure Reduced & PORV Tested Satisfactorily ‎ (← links)
  • 05000389/LER-1983-044-03, /03L-0:on 830802,w/charging Pump a Out of Svc for Maint,Charging Pump C Failed & Placed Out of Svc.Caused by Failed Head Gasket Leak.Gasket Replaced ‎ (← links)
  • 05000389/LER-1983-042-03, /03L-0:on 830801,turbine Intercept Valve C Failed to Close.Caused by Trip Block/Solenoid Encl Box Hanging from Control Leads,Due to Loose Allen Screws.Screws Tightened & Leads Repaired ‎ (← links)
  • 05000389/LER-1983-041-03, /03L-0:on 830730,oxygen Concentrations of 9.2% & 9% for Waste Gas Decay Tank Exceeded Tech Spec Limit of 2%. Concentrations Reduced Via Nitrogen Dilution.Gaseous Waste Sys Isolated & Search for Leaks Conducted ‎ (← links)
  • 05000389/LER-1983-020-03, /03L-0:on 830606,safety Injection Tank 2A2 Depressurized to 565 Psig During Filling.Caused by Relief Valve V-3466 Lifting During Filling & Operator Unaware of Pressure Restrictions.Operator Reinstructed ‎ (← links)
  • 05000389/LER-1983-019-03, /03L-0:on 830603,position Indication Lights for PORV 1475 Discovered Out.Caused by Failure of Magnetic Slug Located on Valve Stem.Slug Replaced W/New Magnet W/Annealed Metal ‎ (← links)
  • 05000389/LER-1983-018-03, /03L-0:on 830531,during Initial Startup,Inner Equalizing Valve of Personnel Air Lock Did Not Shut.Caused by Broken Valve Operating Linkage.Valve Replaced & Linkage Repaired ‎ (← links)
  • 05000389/LER-1983-025-03, /03L-0:on 830616,while in Mode 2 Startup & Filling 2A2 Safety Injection Tank,Relief Valve on Refueling Water Tank Return Header Lifted,Resulting in Loss of Pressure in 2B2.Caused by Open Manual Isolation Valve ‎ (← links)
  • 05000389/LER-1983-021-03, /03L-0:on 830602,waste Gas Decay Tank Oxygen Level Found Out of Tech Specs.Possibly Caused by in-leakage.Leaks Corrected ‎ (← links)
  • 05000389/LER-1983-006-01, /01T-0:on 830511,leak of Approx 1 Quart Per Minute Developed in Weld on 1-inch Drain Line for Safety Injection Header 2B1.Cause Unknown.Cracked Weld & Associated Piping Replaced.Weld Undergoing Exam ‎ (← links)
  • 05000389/LER-1983-003-03, /03L-0:on 830412,following Initial Core Load,Low Pressure Safety Injection Pump a Tripped Off.Condition Resulted in Loss of Operation of Shutdown Cooling Loop A. Caused by Personnel Error.Technician Reinstructed ‎ (← links)
  • 05000389/LER-1983-003, Forwards LER 83-003/03L-0 ‎ (← links)
  • 05000389/LER-2018-001-01, Pressurizer Instrument Nozzle Leak Due to Primary Water Stress Corrosion Cracking ‎ (← links)
  • 05000389/LER-2018-002, Automatic Reactor Trip Due to a Breaker Failure on the 2A1 6.9kV Bus ‎ (← links)
  • 05000389/LER-2018-001, Pressurizer Instrument Nozzle Leak Due to Primary Water Stress Corrosion Cracking ‎ (← links)
  • 05000389/LER-1917-004, Regarding Automatic Reactor Trip Due to Turbine Control System Malfunction ‎ (← links)
  • 05000389/LER-1917-003, Regarding Improper System Realignment Resulted in Loss of Steam Driven Auxiliary Feedwater Pump Flow Indication ‎ (← links)
  • 05000389/LER-1996-001-01, :on 960105,reactor Manually Tripped Due to High Main Generator Cold Gas Temp.Caused by Failure of Hydrogen Cooler Temp Cv Controller to Maintain TCV in Proper Position.Tcv Setting adjusted.W/960312 Resubmitted Ltr ‎ (← links)
  • 05000389/LER-1995-005-02, :on 951120,2A EDG Relay Socket Failures Occurred Due to High Cycle Fatigue.Replaced Degraded Relay Sockets & 2A & 2B EDGs Run for 24 H Each,At Full Load After Replacement of Degraded Relay Sockets ‎ (← links)
  • 05000389/LER-1990-005-03, :on 901112,component Cooling Water HX Pinhole Leak Discovered Due to Shell to Tube Sheet Weld Degradation. Sample of West End Weld Removed & Sent to Lab for Failure Analysis ‎ (← links)
  • 05000389/LER-1999-007, :on 990610,unplanned Cooldown Transient Occurred Due to Personnel Error.Trained & Briefed Personnel & Revised Procedures.With ‎ (← links)
  • 05000389/LER-1999-005, :on 990604,CEA Drop Resulted in Manual Reactor Trip.Caused by Procedural Inadequacies.Procedure Changes Are Planned to Correct Lack of Procedural Guidance for CEA Subgroup Power Switch Replacement.With ‎ (← links)
  • 05000389/LER-1999-006, :on 990605,sub-critical Reactor Trip Occurred Due to Inadvertent MSIV Opening.Caused by Personnel Error. Provided Operation Supervision Instruction to Operating Crews,Stand Down Meetings & Operator Aids.With ‎ (← links)
  • 05000389/LER-1999-004, :on 990415,as Found Cycle 10 Psv Setpoints Were Outside TS Limits.Caused by Manufacturing Process Defect. All Three Psvs Were Replaced with pre-tested Valves During Cycle 11 Refueling Outage.With ‎ (← links)
  • 05000389/LER-1999-003, :on 990406,ECCS Suction Header Leak Resulted in Both ECCS Trains Being Inoperable & Entry Into TS 3.0.3. Caused by Chloride Induced OD Stress Corrosion Cracking of Piping.Made Code Repairs & Coated Piping.With ‎ (← links)
  • 05000389/LER-1999-002, :on 990311,SG ECT Error Caused Operation with Condition Prohibited by Ts.Caused by Deficiencies in Data Analysis Guideline Instructions.Licensee Will Change Data Analysis Guidelines for Lead Analysts.With ‎ (← links)
  • 05000389/LER-1999-001, :on 990211,inadequate TS SRs for SIT & SDC Isolation Valves Were Noted.Caused by Failure to Correctly Implement TS Srs.Submitted LAR to Align Required TS SR with Design Bases Requirements Being Verified.With ‎ (← links)
  • 05000389/LER-1998-010, :on 981207,RCS Boron Sample Frequency Required by Ts,Was Exceeded by Twelve Minutes.Caused by Personnel Error.Equipment Clearance Order Was Lifted to Draw Required Sample & Operations Procedure Was Changed.With ‎ (← links)
  • 05000389/LER-1997-002, :on 981204,containment Sump Debris Screen Was Not IAW Design.Caused by Inadequate C/As for Sump Screen Anamolies.All Identified Sump Screen Deficiencies Were Dispositioned &/Or Repaired.With ‎ (← links)
  • 05000389/LER-1998-008-01, :on 981118,missed TS SG U Tube Insp.Caused by Encoding Errors While Using Remote Positioning Fixtures.All SG Tube Surveyed.With ‎ (← links)
  • 05000389/LER-1998-005, :on 980807,discovered That New MOV Methodology Caused Past PORV Block Valve Operability Problem.Caused by Inadequacies in Original Vendor MOV Methodology.Planned Valve Mods Will Be Implemented During Cycle 11 1998 Outage ‎ (← links)
  • 05000389/LER-1998-005-01, Forwards LER 98-005-01,describing How New MOV Methodology Caused Past PORV Block Valve Operation Problems.Revised LER Changes Safety Significance for Inoperable PORV Block Valves Based on Subsequent SS Analysis,Per LER 98-00 ‎ (← links)
  • 05000389/LER-1998-006-01, :on 980918,inadvertent Afas Actuation Was Noted.Caused by Degradation of Multiple Afas Power Supplies. Replaced Afas Power Supplies & Revised Procedures.With ‎ (← links)
  • 05000389/LER-1998-007-01, :on 980918,identified Discrepancies Between Fire Protection Design Requirements & Field Conditions. Caused by Inadequate Translation & Implementation of Fire Protection Requirements.Procedures Revised.With ‎ (← links)
  • 05000389/LER-1998-004-01, :on 980430,discovered Waste Gas Decay Tank Operation W/O Available Oxygen Analyzers,Which Is Prohibited by Ts.Caused by Inadequate Licensee Review of License Amend. Oxygen Analyzer Recalibrated ‎ (← links)
  • 05000389/LER-1998-003-01, :on 980326,discovered Containment Pressure Instrumentation Design Single Failure Vulnerability.Caused by Inadequate Design by Personnel Error.Removed RPS & ESFAS Containment Pressure Bypass Keys Immediately ‎ (← links)
  • 05000389/LER-1998-002-01, :on 980224,radiation Monitor Surveillance Inadequacies Led to Operating of Facility Prohibited by Tss. Caused by Congnitive Personnel Error.Permanent Procedure Changes Were Implemented ‎ (← links)
  • 05000389/LER-1998-001-01, :on 980206,high/low Pressure Shutdown Cooling Interface Was Noted Outside App R Design Bases.Caused by Personnel Error.Addl Guidance Was Provided to Engineering Dept Personnel ‎ (← links)
  • 05000389/LER-1997-008-02, :on 971107,inadequate CR Ventilation Surveillance Resulted in Condition Prohibited by Ts.Caused by non-cognitive Personnel Error.Operating Procedure 2-1900050 Was Revised ‎ (← links)
  • 05000389/LER-1997-007-02, :on 971008,inoperable Containment Cooling Fan Resulted in Operation of Facility Outside Design Basis. Caused by non-cognitive Personnel Error.Ccs Operation Was Revised & Issued on 971013 ‎ (← links)
  • 05000389/LER-1997-006-01, :on 970630,discovered Inadequate Testing of Engineered Safety Features Subgroup Relays.Caused by Inadequacy in Implementing TS Requirements in Surveillance Procedures.Revised Surveillance Procedures ‎ (← links)
  • 05000389/LER-1997-005-02, :on 970625,discovered That Hot Shutdown Control Panel Shutdown Cooling Flow indicator,FI-3306 Inoperable. Caused by Weakness in Work Order & Procedure Used to Repair FI-3306.Section Meeting W/I&C Planners Held ‎ (← links)
  • 05000389/LER-1997-004-02, :on 970611,discovered Incorrect Original Cable Tray Fire Stop Assembly Installation Was Outside App R Design Basis.Caused by Personnel Error.Hourly Fire Watch Patrols Will Be Posted ‎ (← links)
  • 05000389/LER-1997-003-02, :on 970521,determined Required Post Maint Open Stroke Test for Valve V3245,2B2 SIT Discharge Check Valve, Had Not Been Performed.Caused by Personnel Error.Procedure Revised ‎ (← links)
  • 05000389/LER-1997-002-03, :on 970518,containment Sump Debris Screen Was Not IAW Design Due to Gaps in Screen Encl.Performed SER to Document Containment Sump Design Requirements ‎ (← links)
  • 05000389/LER-1997-001-03, :on 970423,containment Isolation Actuation Occurred.Caused by Increased Radiation Levels During Removal of Upper Guide Structure.Proper Actuation of Containment Isolation Components Was Verified ‎ (← links)
  • 05000389/LER-1996-007-02, :on 961211,operation Prohibited by TSs Occurred Due to Inadequate Surveillance of MSIS Actuation Logic. Testing of MSIS High Containment Pressure 2/4 Actuation Logic Was Satisfactorily Performed on 961211 ‎ (← links)
  • 05000389/LER-1996-006-02, :on 961211,operation Prohibited by TS Identified Due to Inadequate Surveillance of Auxiliary Feedwater Components.Caused by Inadequate Procedures. Procedures Revised & Addl Testing Performed ‎ (← links)
  • 05000389/LER-1996-005-02, :on 961206,determined That Independent Operability of Trip Coils Had Not Been Adequately Tested. Caused by Inadequate Surveillance Procedure.Performed Testing of Coils & Revised Procedures ‎ (← links)
  • 05000389/LER-1996-004-02, :on 960923,operation Prohibited by TS Occurred. Caused by Cognitive Personnel Error.Fpl Verified That a Successful Stroke Time Surveillance Was Conducted on FCV-25-7 & FCV-25-8 ‎ (← links)
  • 05000389/LER-1996-003-02, :on 960625,SITs Discharge Valves Procedurally Isolated in Mode 4 Due to Personnel Error.Issued Night Order to Licensed Operators ‎ (← links)
  • 05000389/LER-1996-002-02, :on 960606,reactor Manually Tripped.Caused by Positioner Feedback Arm Failure on Main Generator Hydrogen Cooler Tcv.Mods Made to Hydrogen Cooler TCV to Eliminate Feedback Assembly & Reduce Vibration ‎ (← links)
  • 05000389/LER-1995-004-02, :on 951010,RCS Instrument Nozzle Leakage Occurred.Caused by Primary Water Stress Corrosion Cracking. Completed Visual Insp of Other RCS Instrument Nozzles ‎ (← links)
  • 05000389/LER-1995-003-01, :on 950410,TS Scheduled Surveillance Was Missed Due to Procedural Deficiency.Performed Airlock Leak Test within 24 H Deferral Interval of TS 4.0.3 ‎ (← links)
  • 05000389/LER-1995-002-01, :on 950221,Unit 2 Automatically Tripped.Caused by Coalescing of Microscopic Conductive Particulates in Full Fluid,Acting as Short Circuit Between Ctr Diaphragm of Transmitter.New Level Transmitter Placed ‎ (← links)
  • 05000389/LER-1995-001-01, :on 950221,noted No Increase in Discharge Pressure for Pump & Low Running Amps for Motor During ASME Code Surveillance.Caused by Air Binding.All Pumps & Piping Vented Extensively ‎ (← links)
  • 05000389/LER-1993-007, :on 930521,manual Reactor Trip After Control Element Assemblies Dropped Simultaneously Due to Failed Equipment.Isolated Grounded Conductors in Electrical Penetration D-1 ‎ (← links)
  • 05000389/LER-1994-006, :on 940714,trip Circuit Breaker Five Failed to Open Due to Broken Piece of Phenolic Block Lodged in Trip Latch Mechanism.Need for Strict Adherence to TS Emphasized ‎ (← links)
  • 05000389/LER-1994-005-01, :on 940708,TS 3.0.3 Entered When Emergency Core Cooling Systems Limiting Condition for Operation Was Not Met Due to Personnel Error.Operations Has Revised Format of Equipment ‎ (← links)
  • 05000389/LER-1994-004-01, :on 940628,discovered That Low & High Range Sample Lines Disconnected.Caused by Personnel Error. Discrepancy Documented,Calibr of Plant Vent WRGM Flow Meters Completed & WRGM Placed Back in Svc ‎ (← links)
  • 05000389/LER-1993-009, :on 931117,containment Isolation Sys Subgroup Actuation Module Trip Occurred Due to Spurious Signal on One Containment Isolation Sys Channel.Module Replaced,Tested & Reset ‎ (← links)
  • 05000389/LER-1994-003-02, :on 940423,while Performing Power Range & Monthly Calibration Procedure on RPS Channel B,Required Channel to Be in Bypass.Caused by Improperly Wired Bypass Circuit.Repaired Bypass Circuit & ICM ‎ (← links)
  • 05000389/LER-1993-005, On 930112,vibration Level Began to Increase on 2A1 Reactor Coolant Pump.Caused by Growing Circumferential Crack in Pump Shaft.Corrective Action:New Motor Rotor Assembly Was Installed on 2A1 RCP ‎ (← links)
  • 05000389/LER-1994-002-02, :on 940316,pressurizer Instrument Nozzle Weld Cracking Identified Due to Fabrication Defects.More Suitable Weld Matl Will Be Used in Repairing Steam Space Nozzles Prior to Restart ‎ (← links)
  • 05000389/LER-1994-001-02, :on 940217,pressurizer Auxiliary Spray Declared Out of Svc.Caused by Mispositioned Valve Due to Personnel Error.Valve Correctly Realigned,Plant Records Reviewed & Nonlicensed Operators Counseled ‎ (← links)
  • 05000389/LER-1993-008-01, :on 931102,manual Reactor Trip Initiated Due to High Gas Temps in Main Generator.Caused by Procedural Deficiency.Turbine Lube Oil Cooling Sys Configuration Verified ‎ (← links)
  • 05000389/LER-1993-006, :on 930513,EDG 2B Inadvertently Started During Safeguards Relay Testing Due to Personnel Error.Personnel Performing Test Counseled on Communications & Safeguards Relay Testing Completed Satisfactorily ‎ (← links)
  • 05000389/LER-1993-004, :on 930302,personnel Discovered Water Dripping Onto Floor in Containment Near Pressurizer.Caused by Leakage Escaping from Through Wall Cracks in Affected Nozzles. Cracked Nozzles Will Be Replaced ‎ (← links)
  • 05000389/LER-1992-008, :on 921105,discovered Digital Data Process Sys Calorimetric Error Due to Calibration Error.Operations Reduced Power to Less That 100%,RTDs Examined by Labs & I&C Personnel Reviewed Tests ‎ (← links)
  • 05000389/LER-1993-003-01, :on 930201,discharge Occurred from Safety Injection Tanks to Rcs.Caused by Personnel Error.Operators Closed SIT Discharge Isolation Valves,Deenergized Motor Operators & Personnel Involved Counselled ‎ (← links)
  • 05000389/LER-1993-002-02, :on 921201,missed Surveillance on RCS Pressure Isolation Check Valves Due to Procedural Deficiency. Deficiencies in SR Corrected to Include Precautions in Procedure ‎ (← links)
  • 05000389/LER-1993-001-01, :on 930108,chemistry Technician Failed to Sample Third SI Tank & Sampling of SI Tank 2A1 Not Performed within TS Required Interval After Filling Tank.Caused by Personnel Error.Personnel Counseled ‎ (← links)
  • 05000389/LER-1992-008-02, :on 921105,digital Data Process Sys Indicated Power Level Slightly Greater than 100%,due to RTD Instrument Error.Failed RTDs Will Be Evaluated by Consultant for Root Cause Analysis ‎ (← links)
  • 05000389/LER-1992-007-02, :on 921025,licensed Operator Inadvertently Started 2B Containment Spray Pump.Caused by Cognitive Personnel Error.Plant Training Dept Will Evaluate Event to Determine Appropriate Training Requirements ‎ (← links)
  • 05000389/LER-1992-006-01, :on 920810,manual Reactor Trip Occurred Due to Fire in 2C Condensate Pump Motor Electrical Lead Box.Caused by Procedural Deficiency.Fire Extinguished & Unit Stabilized in Mode 3 ‎ (← links)
  • 05000389/LER-1992-004-03, :on 920708,reactor Manually Tripped Due to Low SG Water Level.Caused by Failed Lead/Lag Circuit in Feedwater Regulating Valve Sys.Design Change Will Delete Circuits from SG Water Level Circuitry ‎ (← links)
  • 05000389/LER-1992-005-02, :on 920710,reactor Tripped from Loss of 100% Power on Loss of Load While Performing Turbine Trip Valve Tests.Caused by Failure to Predict Sharp Pressure Transient. On-line Testing of Solenoid Valves Suspended ‎ (← links)
  • 05000389/LER-1992-001, :on 920421,three of Four Local Power Density pre-trips in RPS Alarmed & Turbine Remained Tied to Sys Grid.Caused by Inadequate Core Axial Shape Index Mgt Guidelines.Procedures Changed ‎ (← links)
  • 05000389/LER-1992-003-03, :on 920526,EDG 2B Inadvertently Actuated When Relay Installed in Cubicle 1 of 4,160-volt Bus 2B3.Caused by Design Error.Electrical Loads Returned to Normal & Test Circuit Design Will Be Changed ‎ (← links)
  • 05000389/LER-1992-002-03, :on 920430,containment Pressure Channel C Sensing Line for Containment Pressure Instrument PT-07-2C Process Line in Containment Capped.Caused by Personnel Error.Cap on Channel C Removed ‎ (← links)
  • 05000389/LER-1992-001-03, :on 920421,reactor Manually Tripped When Difficulties Encountered in Maintaing Neutron Flux Axial Shape Index Limits.Caused by Inadequacy in Index Mgt Guidelines.Procedures & Design Changed ‎ (← links)
  • 05000389/LER-1990-005, Forwards Plans for Exam of Component Cooling Water HX 2B Welds,Per Encl LER 90-005-00.Util Plans to Conduct non-NDE of Full Circumference of HX Shell/Tube Welds During 1992 Outage to Better Characterize Condition of Welds ‎ (← links)
  • 05000389/LER-1991-006-03, :on 911129,operator Noted That Unit in Condition Prohibited by Plant Tech Specs.Caused by Cognitive Personnel Error by Utility Licensed Operators.Responsible Licensed Personnel Counselled ‎ (← links)
  • 05000389/LER-1991-005-03, :on 910924,discovered That Sept Surveillance for Safety Injection Tank Water Level & Monthly Channel Functional Test Not Performed on Due Date of 910920.Caused by Personnel Error.Test Performed ‎ (← links)
  • 05000389/LER-1991-003, :on 910426,shutdown Cooling HX 2A Discovered Out of Svc While Searching for Dc Ground.On 910417,outlet Valve V-3457 Out of Svc.Caused by Mispositioned Cooling Water Valve.Valve Realigned ‎ (← links)
  • 05000389/LER-1991-004, :on 910503,two Containment Fan Coolers Inoperable Based on Low Component Cooling Water Flow.Caused by Design Error.Flows Returned to Normal Values & Verified to Be Above Tech Specs Limits ‎ (← links)
  • 05000389/LER-1991-002-01, :on 910415,missed Tech Spec Surveillance Discovered.Caused by Procedural Error.Surveillance Procedure Revised to Require Testing of Equipment Relays for Boric Acid Gravity Feed Valves & Cooling Fans ‎ (← links)
  • 05000389/LER-1991-001-03, :on 910304,inadvertent Actuation of Auxiliary Feedwater Sys Channel a Occurred While Performing Routine Surveillance.Caused by Momentary Loss of Power Supply.Power Supply Replaced & Procedures Changed ‎ (← links)
  • 05000389/LER-1990-006-04, :on 901219,inadvertent Actuation of Auxiliary Feedwater Equipment During Monthly Testing Occurred.Caused by Test Instrument Malfunction.Instrument & Control Procedure Revised ‎ (← links)
  • 05000389/LER-1990-006-03, :on 901219,inadvertent Actuation of Auxiliary Feedwater Sys Equipment Occurred During Monthly Functional Testing.Caused by Equipment Failure.Details of Event & Troubleshooting Plan Reviewed ‎ (← links)
  • 05000389/LER-1989-009, :on 891128,containment Purge Valve Local Leak Rate Exceeded Tech Spec Limits.Caused by Valve Closure Stop Out of Adjustment.Testing Frequency Increased to Once Every 6 Wks ‎ (← links)
  • 05000389/LER-1990-004-02, :on 901109,inadvertent Actuation of Assorted Engineered Safeguards Equipment,Including Emergency Diesel Generator 2A,occurred.Caused by Personnel Error.Personnel Counseled ‎ (← links)
  • 05000389/LER-1990-003-03, :900726,determined That Main Steam Line Radiation Monitor Returned to Svc Following Power Supply Replacement W/O Performing Required Tech Spec Surveillance. Caused by Personnel Error.Personnel Counseled ‎ (← links)
  • 05000389/LER-1990-002-03, :on 900713,discovered That 480-volt Ac Emergency Bus Degraded Voltage Relays Specified to Be Set Below Min Voltage Allowed by Tech Specs.Caused by Design Error.New Setpoints Developed ‎ (← links)
  • 05000389/LER-1990-001-01, :on 900114,steam Generator Feed Pump 2B Low Suction Pressure Alarm Received,Condensate Pump 2A Would Not Start & Pump B Tripped on Low Suction Pressure.Caused by Personnel Error.Pump Governor Oil Drained ‎ (← links)
  • 05000389/LER-1989-009-12, :on 891128,containment Local Leak Rate on Containment Penetration 10 Containing Exhaust Line for Containment Purge Sys Exceeded Tech Specs.Cause Not Determined.Valve Seat Travel Stop Adjusted ‎ (← links)
  • 05000389/LER-1989-003-01, :on 890321,unit Received Containment Isolation Actuation Signal.Caused by Personnel Error.Splash Guard Installed on 12 Cylinder Engine for Diesel Generators 2A & 2B to Prevent Spurious Pressure Trips ‎ (← links)
  • 05000389/LER-1989-008-02, :on 890924,plant Engineer Failed to Follow Approved Plant Procedures & Performed Improper Surveillance on Safety Injection Header Check Valves.Caused by Personnel Error.Involved Check Valves Tested ‎ (← links)
  • 05000389/LER-1989-007-02, :on 890923,unit Experienced Dropped Control Element Assembly in Regulating Group 1.Most Probable Cause of Event Was Blown Fuse.Root Cause for Breaker Trip Not Conclusively Identified.Blown Fuse Replaced ‎ (← links)
  • 05000389/LER-1989-006-02, :on 890816,diesel Generator 2B Placed Out of Svc W/Hydrogen Analyzer 2A Also Out of Svc.Caused by Cognitive Personnel Error by util-licensed Operator. Generator & Analyzer Returned to Svc ‎ (← links)
  • 05000389/LER-1989-005, :on 890626,reactor Tripped on Loss of Load from 22% Power During Turbine Startup Due to High Steam Generator Level in Steam Generator.Caused by Personnel Error.Personnel Counseled & Training Methods Evaluated ‎ (← links)
  • 05000389/LER-1989-004-02, :on 890605,leak Rate on Containment Penetration 10 Exceeded Allowance,Per Tech Spec 4.6.1.7.3. Caused by Personnel Error.Technical Manual Change Request Submitted ‎ (← links)
  • 05000389/LER-1989-003, :on 890321,inadvertent Containment Isolation Actuation Signal Occurred W/Unit in Mode 6 & Reactor Vessel Head Installed But Untorqued.Caused by Personnel Error. Personnel Counseled ‎ (← links)
  • 05000389/LER-1989-002-01, :on 890309,containment Isolation Valve for Primary Water Had Leak Rate in Excess of Tech Specs.Caused by Failure to Perform post-maint Leak Rate Testing Due to Procedural Deficiency.Valve Repacked ‎ (← links)
  • 05000389/LER-1989-001-02, :on 890222,water Level in Spent Fuel Pool Raised High Enough to Flood Intake Ventilation Ducts Lining Perimeter of Pool,Rendering Ventilation Sys Inoperable. Caused by Personnel Error.Ductwork Drained ‎ (← links)
  • 05000389/LER-1988-004-01, :on 880407,sample of Reactor Coolant Specific Activity on Dose Equivalent I-131 Was Taken 8 H Past Tech Specs Limits.Caused by Program Error on Thermal Power Change Alarm Setpoint.Program Error Corrected ‎ (← links)
  • 05000389/LER-1988-003-03, :on 880313,normal/isolate Switch for Letdown Isolation Valve Discovered in Isolate Position Due to False Electrical Signals Generated on 880313.Caused by Operator Misinterpretation of Wiring Diagram ‎ (← links)
  • 05000389/LER-1988-002-03, :on 880218,reactor Containment Bldg Polar Crane Power Supply Breaker Found in Tagged Open Position.Caused by Personnel Error.Reactor Containment Bldg Polar Crane Power Supply Breaker Locked Open ‎ (← links)
  • 05000389/LER-1988-001-02, :on 880201,safety Injection Tank 2B2 Declared Out of Svc & Relief Valve on Fill & Drain Line to Safety Injection Tank 2A2 Lifted & Failed to Reseat.Caused by Failure of Valves.Work Repair Orders Issued ‎ (← links)
  • 05000389/LER-1987-007, :on 871125,reactor Tripped on Loss of Load Due to Turbine Trip.Caused by Personnel Error.Permanent Magnet Generator & Exciter Bearing Replaced & Exciter Bearing Thermocouple Removed ‎ (← links)
  • 05000389/LER-1987-007-02, :on 871125,reactor Tripped on Loss of Load Due to Turbine Trip Caused by Failure of Main Generator Exciter Bearing.Root Cause Is Personnel Error.Electrical Maint Personnel Trained & Procedures Revised ‎ (← links)
  • 05000389/LER-1987-008-03, :on 871128,oil Fire Occurred at Reactor Coolant Pump (Rcp).Caused by Oil Leak from Loose Packing Gland on Instrument Isolation Valve.Leaking Valve Repaired.Visual Insp & Leak Test Conducted on 2A1 RCP Oil Pans ‎ (← links)
  • 05000389/LER-1986-011, :on 860709,emergency Diesel Generator 2A Taken Out of Svc Due to Failure to Meet Required Start Time.Caused by Excessive Tightening of Friction Clutch Locknut.Cooling Fan Shroud Removed & Fan Repositioned ‎ (← links)
  • 05000389/LER-1987-006-03, :on 870917,discovered That Test of Emergency Diesel Generator Automatic Load Sequence Relays Incomplete. Caused by Personnel Error.Personnel Immediately Performed Required Surveillance Test Per Procedure ‎ (← links)
  • 05000389/LER-1987-005-03, :on 870527,while Operating in Mode 1,control Element Assemblies 5 & 7 Simultaneously Dropped to Bottom of of Core.Possibly Caused by Random Intermittent Failure of Control Element Drive Mechanism Component ‎ (← links)
  • 05000389/LER-1987-003-03, :on 870409,during Troubleshooting,Jumper Placed on Wrong Terminal of Main Steam Isolation Signal (MSIS) Actuation Pushbutton Circuitry,Causing Actuation of Msis. Caused by Cognitive Personnel Error ‎ (← links)
  • 05000389/LER-1987-002-03, :on 870305,reactor Trip Occurred Due to Low Steam Generator Level.Caused by Malfunctioning Main Feedwater Regulating Valve Actuator Preventing Proper Feed Flow to Steam Generator.Actuator Replaced ‎ (← links)
  • 05000389/LER-1987-001-03, :on 870303,auxiliary Feedwater Actuation Signal Received When Util Instrument & Control Technicians Lost Power to Channel D.Caused by Combination of Design, Procedural & Personnel Errors ‎ (← links)
  • 05000389/LER-1986-011-02, :on 860709,during Full Power,Both Diesel Generators Simultaneously Taken Out of Svc.Caused by Personnel Error & Broken Roll Pin in Governor of Diesel Generator 2A2.Maint Personnel Counseled ‎ (← links)
  • 05000389/LER-1986-006-01, :on 860312,both Emergency Diesel Generators Out of Svc.Caused by Damaged Idler Pulley Wheel & Loose Locknut in Friction Clutch Assembly.Generators Repaired & Remaining Generators Inspected ‎ (← links)
  • 05000389/LER-1984-013-02, :on 841119,wide-range Nuclear Instrumentation Circuitry Noise Caused Spurious High Startup Rate Trip. Cause of Noise Indeterminate.No Corrective Actions Taken ‎ (← links)
  • 05000389/LER-1983-037-03, /03L-0:on 830728,during Loss of Offsite Power Test,Diesel 2B Failed to Load Onto 4,160-volt Bus.Caused by Broken Electrical Termination Lug.Lug Replaced ‎ (← links)
  • 05000389/LER-1917-002, Regarding 2A3 4.16 Kv Bus De-Energization Due to Voltage Meter Failure ‎ (← links)
  • 05000389/LER-1917-001, Regarding Delay in Initiating Immediate Technical Specification Required Action During Fuel Movements ‎ (← links)
  • 05000389/LER-2015-003, Regarding Legacy Wiring Error Impacts Containment Valve Closure Time Surveillances ‎ (← links)
  • 05000389/LER-2015-002, Regarding 2A Emergency Diesel Generator Actuation Logic ‎ (← links)
  • 05000389/LER-2015-001, Regarding Shutdown Due to Through Wall Crack and Leak in the 2B2 Safety Injection Tank Discharge Pipe ‎ (← links)
  • 05000389/LER-2014-002, Regarding Shutdown Due to Spurious Closure of Main Feed Isolation Valve (Mfiv) ‎ (← links)
  • 05000389/LER-2014-001, Lucie, Unit 2 Regarding Unit Shutdown Due to Leak on Safety Injection Tank Vent Valve Piping ‎ (← links)
  • 05000389/LER-2013-005, Regarding Unanalyzed Condition Affecting Emergency Diesel Generators ‎ (← links)
  • 05000389/LER-2013-004, Regarding Manual Trip Following Spurious Closure of Main Feedwater Isolation Valve (Mfiv) and Lowering of Steam Generator Levels ‎ (← links)
  • 05000389/LER-2013-003, Regarding 2A Emergency Diesel Generator Failed to Start ‎ (← links)
  • 05000389/LER-2013-001, Regarding Unplanned Manual Reactor Trip Due to Algae ‎ (← links)
  • 05000389/LER-2013-002, Regarding Failure to Invoke Technical Specification Action Statement for Failed Containment Isolation Valve ‎ (← links)
  • 05000389/LER-2012-003, Regarding Inadvertent Trip of 2B3 4.16kv Switchgear ‎ (← links)
  • 05000389/LER-2012-002, Regarding Non-Segregated Phase Bus Fault Resulting in Partial Loss of Offsite Power ‎ (← links)
  • 05000389/LER-2012-001, Regarding a Trip Due to Erratic Main Feedwater Regulating Valve Behavior ‎ (← links)
  • 05000389/LER-2011-002, Regarding Unplanned Automatic Reactor Trip During Reactor Protection System Testing ‎ (← links)
  • 05000389/LER-2011-001, Regarding Inadvertent Crosstie of Component Cooling Water (CCW) to Control Room A/C Units ‎ (← links)
  • 05000389/LER-2010-002, Regarding Manual Reactor Trip Due to Moisture Separator Re-heater Safety Valve Lift ‎ (← links)
  • 05000389/LER-2010-001, Regarding Control Room Habitability Impacted by General Atomics Model RM-80 Radiation Monitoring System Firmware Anomaly ‎ (← links)
  • 05000389/LER-2009-004, Unplanned Manual Reactor Trip During Reactor Startup ‎ (← links)
  • 05000389/LER-2009-003, Regarding RCP 2B2 Lower Seal Cavity Line Leak ‎ (← links)
  • 05000389/LER-2009-002, Ingress of Algae Results in Manual Trip ‎ (← links)
  • 05000389/LER-2009-001, Main Feedwater Isolation Valves Stroke Time Potentially Affected by Temperature ‎ (← links)
  • 05000389/LER-2008-003, Re Condensate Pump Failure Resulting in Manual Reactor Trip ‎ (← links)
  • 05000389/LER-2008-002, For St. Lucie, Unit 2, Regarding Unit 2 Manually Tripped as a Result of Maintenance ‎ (← links)
  • 05000389/LER-2008-001, RCP 2B1 Upper Seal Cavity Line Leak ‎ (← links)
  • 05000389/LER-2007-003, Regarding Manual Reactor Trip Following Misalignment of Five (5) Control Element Assemblies (Ceas) During Plant Startup ‎ (← links)
  • 05000389/LER-2007-002, Regarding 2B2 Reactor Coolant Pump (RCP) Seal Housing Leakage ‎ (← links)
  • 05000389/LER-2007-001, Regarding Reactor Shutdown Due to Unidentified RCS Leakage ‎ (← links)
  • 05000389/LER-2006-004, Re Unplanned Manual Reactor/Turbine Trip Due to DEH Leak ‎ (← links)
  • 05000389/LER-2006-003, Re Missed Eddy Current Indication from SL2-15 Inspection ‎ (← links)
  • 05000389/LER-2006-002, Re Containment Purge Supply Isolation Valve Failure ‎ (← links)
  • 05000389/LER-2006-001, Re Manual Reactor Trip Due to Condenser Tube Leak ‎ (← links)
  • 05000389/LER-2005-003, Re Personnel Error Caused Partial Loss of Feedwater and Manual Reactor Trip ‎ (← links)
  • 05000389/LER-2005-002, Valve Mispositioning Led to Inoperable Iodine Removal System Train ‎ (← links)
  • 05000389/LER-2004-005, Regarding Manual Reactor Trip Due to Steam Generator Low Level ‎ (← links)
  • 05000389/LER-2004-004, Regarding Manual Reactor Trip Due to Condensate Pump Motor Malfunction ‎ (← links)
  • 05000389/LER-2004-003, Re Panel Display Failures Caused Loss of Technical Specification Required Range ‎ (← links)
  • 05000389/LER-2004-002, Regarding Reactor Auxiliary Building Missile Shield Doors Not Closed ‎ (← links)
  • 05000389/LER-2004-001, Regarding Control Room Floor Fire Penetration Conditions Not Bounded by the Tested Configurations ‎ (← links)
  • 05000389/LER-2003-006, Regarding Long-Standing 2C TDAFW Pump Design Issue Resulted in Condition Prohibited by Technical Specifications ‎ (← links)
  • 05000389/LER-2003-005, Regarding Automatic Reactor Trip Due to Loss of Turbine Generator Excitation ‎ (← links)
  • 05000389/LER-2003-004, Regarding Condensate Pump Motor Bearing Failure That Resulted in Manual Reactor Trip ‎ (← links)
  • 05000389/LER-2003-003, For St. Lucie, Unit 2 Regarding Feedwater Control Malfunction Led to Automatic Reactor Scram ‎ (← links)
  • 05000389/LER-2003-002, For St. Lucie Unit 2 Regarding Two Flaws Identified During Refueling Outage Reactor Pressure Vessel Head Inspections ‎ (← links)
  • 05000389/LER-2003-001, For St. Lucie Unit 2 Manual Reactor Trip Due to Decreasing Main Condenser Vacuum ‎ (← links)
  • 05000389/LER-2002-002, Regarding Found Cycle 12 Pressurizer Safety Valve Setpoints Outside TS Limits ‎ (← links)
  • 05000389/LER-2002-001, Control Room Envelope Degraded During Door Seal Maintenance Activities ‎ (← links)
  • 05000389/LER-2001-002, As-Found Cycle 12 Main Steam Safety Valve Setpoints Outside Technical Specification Limits ‎ (← links)
  • 05000389/LER-2001-003, Steam Generator Tube That Exceeded Plugging Criteria Remained In-Service ‎ (← links)
• 10 CFR 50.72(b)(3)(ii), Degraded or Unanalyzed Condition ‎ (← links)
• ML072970529 (redirect page) ‎ (← links)
• 05000389/LER-2007-003, Regarding Manual Reactor Trip Following Misalignment of Five (5) Control Element Assemblies (Ceas) During Plant Startup ‎ (← links)
• 05000389/LER-2007-002, Regarding 2B2 Reactor Coolant Pump (RCP) Seal Housing Leakage ‎ (← links)
• 05000335/LER-2007-001, Re Mispositioned Service Air Containment Isolation Valves ‎ (← links)