Pages that link to "05000280/LER-2024-001, Troubleshooting Initiated Unknown Turbine Trip Feature in Control System"

The following pages link to 05000280/LER-2024-001, Troubleshooting Initiated Unknown Turbine Trip Feature in Control System:

Displaying 25 items.

• 10 CFR 50.73(a)(2)(iv)(A), System Actuation (← links)
• ML101660088 (← links)
• ML092540513 (← links)
• ML091200369 (← links)
• ML021550433 (← links)
• ML021440631 (← links)
• ML021230056 (← links)
• ML021190521 (← links)
• ML021060225 (← links)
• ML020870669 (← links)
• ML020870253 (← links)
• ML020790024 (← links)
• ML020720005 (← links)
• ML020710690 (← links)
• ML020650732 (← links)
• ML020510321 (← links)
• ML020090100 (← links)
• ML020090084 (← links)
• ML20101H307 (← links)
• ML20099A384 (← links)
• ML20085G964 (← links)
• ML20181A308 (← links)
• ML20136A405 (← links)
• ML24212A077 (redirect page) (← links)
  • IR 05000280/2024003 (← links)
• 05000280/LER-2024-001 (redirect page) (← links)
  • 05000280/LER-2001-003 (← links)
  • 05000280/LER-2001-002 (← links)
  • 05000280/LER-2001-001 (← links)
  • 05000280/LER-1982-072, Forwards LER 82-072/03L-0 & 82-068/03L-0 (← links)
  • 05000280/LER-1982-067, Forwards LER 82-067/03L-0 (← links)
  • 05000280/LER-1982-091, Forwards LER 82-091/03L-0 (← links)
  • 05000280/LER-1982-086, Forwards LER 82-086/03L-0 (← links)
  • 05000280/LER-1982-083, Forwards LER 82-083/03L-0 & Updated LER 82-084/01X-1 (← links)
  • 05000280/LER-1983-003, Forwards LER 83-003/01T-0 (← links)
  • 05000280/LER-1983-002, Forwards LER 83-002/03L-0 & Updated LER 82-126/03X-1 (← links)
  • 05000280/LER-1983-017, Forwards LER 83-017/03L-0 (← links)
  • 05000280/LER-1982-121, Forwards LER 82-121/03L-0 (← links)
  • 05000280/LER-1977-012, RO S1-77-01 Re Failures of Hydraulic Shock Supports (Snubbers).Extent of Failures Reported in LER 77-12.All Snubbers Operable on 771207 Startup (← links)
  • 05000280/LER-1975-006, Supplemental LER 75-06/010:on 750215,module S/N D401 Failed Due to Capacitor C-37 Being Open Circuit.Capacitors Replaced (← links)
  • 05000280/LER-1975-008, Supplementary LER 75-08/01L on 750427.Previously Described Event Caused by Apparent Inadequate Implementation of Administrative Controls During Const & Preoperation. Administrative Control of Electrical Wire Changes Increased (← links)
  • 05000280/LER-1975-015, Updated LER 75-15/01T:on 750803,leaking Fitting on Overhead Gas Compressor B Resulted in Unplanned Release of Radioctive Matl from Site.Caused by Loose Fitting.Leaking Fitting Repaired (← links)
  • 05000280/LER-1975-016, Updated LER 75-16/010:on 750822 & 23,channel II Protection Drifted in Nonconservative Direction.Caused by Moisture Accumulation Between Senson Insulation & Copper Lead Wire. All RTDs Replaced W/Improved Versions (← links)
  • 05000280/LER-1976-002, Updated LER 76-02/01T:on 760313,determined Worst Break LOCA Core Thermal Transient Analysis Inaccurate Since Effects of Steam Generator Tube Plugging on LOCA Not Considered (← links)
  • 05000280/LER-1975-011, Suppl to LER 75-11/01T:on 750416,pinhole Leak Developed in Recirculation Line on Charging Pump 2-CH-P-1C Causing Ventilation Vent Sampler RMS-VG-109 to Alarm.Leak Found & Isolated (← links)
  • 05000280/LER-1983-006, Forwards LER 83-006/03L-0 (← links)
  • 05000280/LER-1982-129, Forwards LER 82-129/03L-0 (← links)
  • 05000280/LER-1983-020, Forwards LER 83-020/03L-0 (← links)
  • 05000280/LER-1983-068, Forwards Updated LER 83-068/03X-1 (← links)
  • 05000280/LER-1983-016, Forwards LER 83-016/03L-0 (← links)
  • 05000280/LER-1983-015, Forwards LER 83-015/03L-0 (← links)
  • 05000280/LER-1983-014, Forwards LER 83-014/01T-0 (← links)
  • 05000280/LER-1983-012, Forwards LER 83-012/03L-0 (← links)
  • 05000280/LER-1983-013, Forwards LER 83-013/03L-0 (← links)
  • 05000280/LER-1982-007, Forwards LER 82-007/03L-0 (← links)
  • 05000280/LER-1981-081, /03L-0:on 820121,during Research for LER 81-081/03L-0,found That Original Vacuum Pumps Were Replaced W/Pumps That Failed to Meet Required Seismic Qualifications. Study of Present Pumps Completed.Assistance Request Issued (← links)
  • 05000280/LER-1982-018, Forwards LER 82-018/03L-0 (← links)
  • 05000280/LER-1980-019, Forwards Updated LER 80-019/03X-1 & LERs 82-058/03L-0 & 82-099/03L-0 (← links)
  • 05000280/LER-1980-009, Forwards LERs 82-049/03L-0,82-080/03L-0 & Updated LER 80-009/01X-1 (← links)
  • 05000280/LER-2024-001, Troubleshooting Initiated Unknown Turbine Trip Feature in Control System (← links)
  • 05000280/LER-2022-003, Loss of Emergency Switchgear Room Cooling Due to Use of Incorrect Air Handler Fan V-Belts (← links)
  • 05000280/LER-2022-002, Failure of Unit 1 Emergency Diesel Generator Results in an Operation or Condition Prohibited by Technical Specifications (← links)
  • 05000280/LER-2022-001, Unit 2, Failure of Two Intake Canal Level Probes Due to Biofouling (← links)
  • 05000280/LER-2021-001, Unanalyzed Condition Due to Appendix R Concern Identified with Cable Separation (← links)
  • IR 05000280/2024003 (← links)
  • 05000280/LER-1989-019, :on 890615,six Auxiliary Bldg Ventilation Fans Tripped When Two Ventilation Exhaust Air Operated Dampers Opened.Caused by Inadequately Designed Test Rig Installed for Special Test.Test Rig Removed (← links)
  • 05000280/LER-1988-030, :on 880517,operator Reported That Water Was Flowing Into Loop C Room from Penetration of Reactor Coolant Loop Through Shield Wall.Cause Unknown.Backup Nitrogen Supply Restored to Inflatable Seal (← links)
  • 05000280/LER-1986-006, :on 860124,specific Activity Sample of Reactor Coolant Showed Dose Equivalent I-131 Level of 1.22 Mci/Cc After Manual Reactor Trip from 42% Power.Caused by Fuel Element Defects in Core.Level Monitored Every 4 H (← links)
  • 05000280/LER-1986-026, :on 860919,quadrant-to-average-power-tilt Ratio Exceeded 2% Tech Spec Limit.Caused by Dropped Control Rod P-6 Due to Failed Stationary Gripper Coil in CRD Mechanism. Coil Replaced (← links)
  • 05000280/LER-1986-034, :on 861117,control/relay Room Chiller C Tripped Due to High Condenser Pressure,Leaving Only One Operable Chiller,In Violation of Tech Specs.Caused by Clogged Suction Strainer.Strainer Cleaned (← links)
  • 05000280/LER-1986-032, :on 861104,svc Water Flow Lost to Charging Pump Svc Water Subsystem & to Control/Relay Room Chiller Condenser Svc Water Subsystem.Caused by Introduction of Air Into Sys.Normal Line Returned to Svc (← links)
  • 05000280/LER-1986-030, :on 861029,number of Inoperable Control Room Chillers Exceeded Requirements of Tech Spec 3.14.Caused by Reduced Water Flow Due to Marine Growth in Svc Water Line. Growth Removed & Chillers Returned to Svc (← links)
  • 05000280/LER-1986-031, :on 861030,svc Water Flow to Charging Pump Svc Water Subsystem Lost When Pumps Became Air Bound After Svc Water Strainer Placed in Svc W/O Being Vented.Caused by Personnel Error.Personnel Instructed (← links)
  • 05000280/LER-1986-027, :on 861009,two of Three Control Room Air Conditioning Chillers Found Inoperable.Caused by One Chiller Out for Maint & Other Inoperable Due to Failed Relay.Failed Relay Jumpered & Replaced (← links)
  • 05000280/LER-1987-001, :on 861223,pressurizer PORVs Declared Inoperable Due to Excessive Stroke Time.Caused by Insufficient Air Flow Due to Air Line Size.Air Lines Will Be Replaced W/Larger Tubing (← links)
  • 05000280/LER-1986-033, :on 861114,reactor Containment Air Partial Pressure Found to Be Less than 9 Psia.Caused by Instrument Drift.Air in-leakage Established to Containment Bldg & Pressure Increased (← links)
  • 05000280/LER-1986-029, :on 860929,svc Water to Charging Pump Svc Water Subsystem Lost.Caused by Leak on Blowdown Line for in-line Strainer.Line Repaired (← links)
  • 05000280/LER-1986-018, :on 860528,emergency Diesel Generator 3 Automatically Started.Caused by Inadequate Design Change Procedure Causing Interruption of Dc Power.Procedure Revised (← links)
  • 05000280/LER-1986-016, :on 860510,lift Settings for Five Safety Valves on Main Steam Line B Found 3% Greater than Lift Setpoints. Caused by Setpoints Set Too High During 841223 Calibr Due to Unreliable Indication (← links)
  • 05000280/LER-1986-025, :on 860918 & 19,control Rods P-6 & P-10 Dropped Into Core,Respectively & Reactor Manually Tripped.Caused by Failed Stationary Gripper Coil & Loose Female Connector Pin. Parts Replaced & Control Rods Tested (← links)
  • 05000280/LER-1986-023-01, :on 860820,containment Sump Trip Valve Found Leaking from Inside Containment Isolation Valve.Caused by Loose Valve Position Indication Arm.Valve Manually Isolated & Screw Set Tightened in Indication Arm (← links)
  • 05000280/LER-1986-022, :on 860916 & 20,partial Train B ESF Actuations Occurred Due to Reactor Protection Sys Relay Failures.Caused by Coil Failure.Coil Replaced & Relay Reinstalled & Tested (← links)
  • 05000280/LER-1986-013, :on 860510,following Shutdown for Refueling Outage,Specific Activity Sample of Reactor Coolant Showed Dose Equivalent of I-131 1.05 Mci/Cc.Caused by Fuel Element Defects in Reactor Core.Level Monitored (← links)
  • 05000280/LER-1986-012, :on 860409,flow Path from Boric Acid Tank to Charging Pump Suction Inadvertently Isolated.Caused by Personnel Error in Isolating Boric Acid Filter.Flow Path Reestablished by Unisolating Filter (← links)
  • 05000280/LER-1985-022, :on 851121, Auxiliary Vent Sys Safety Mode Initiated Alarm Received.Caused by Momentary Decrease of Instrument Air Pressure from Ice Formation.Bypass Valve Adjusted (← links)
  • 05000280/LER-1986-024, :on 860813 & 14,at 100% Power,Control Room Chillers Failed to Operate.Caused by Clogged Chillers Due to Unfiltered River Water Flowing Through Tubes.Chillers Unclogged & Strainer Returned to Svc (← links)
  • 05000280/LER-1986-036, :on 861231,failure to Perform Type B Testing on Pressure Retaining Gaskets on Containment Recirculation Spray HXs (EIIS Be) Discovered.Engineering Work Request Initiated to Replace Diaphragm W/Monal Matl (← links)
  • 05000280/LER-1987-003, :on 870213 & 16,one of Three Control/Relay Room Chillers Operable.Second Chiller Out for Maint & Third Chiller Inoperable.Caused by Inadequate Heat Sinks.One Chiller Replaced,Two New Chillers Ordered (← links)
  • 05000280/LER-1987-004, :on 870213,discovered Potential for Control Room Ventilation Fans to Admit More Unfiltered Air than Allowed.Caused by Inadequate Sealing of Fan Shaft.Temporary Seal Installed Until Fans Repaired (← links)
  • 05000280/LER-1986-021, :on 860713,individual Rod Position Indicators (Irpi) Declared Inoperable,Per Tech Spec 3.12.E.Caused by Instrumentation Drift Affected by Primary Coolant Temp & Control Rod Movement.Irpis Recalibr (← links)
  • 05000280/LER-1986-017, :on 860524,loss of Operating RHR & Component Cooling Pumps 1B Occurred Due to Undervoltage Transient. Caused by Personnel Error.Forced Coolant Circulation Reestablished (← links)
  • 05000280/LER-1986-014, :on 860511,temporary Degradation of Dc Bus Voltage B Experienced,Resulting in ESF Actuation.Caused by Inadequate Procedure in Design Change to Replace Batteries. Procedure Will Be Revised (← links)
  • 05000280/LER-1987-005, :on 870221,control/relay Room Chillers 1-VS-E-4B & 4C Tripped Due to Insufficient Svc Water Flow to Condensers.Caused by Clogged Y-type Suction Strainers. Maint Procedures Re Strainer Cleaning Revised (← links)
  • 05000280/LER-1985-008, :on 850318,tag Inadvertently Placed on Fire Zone 5,locking Out Automatic Initiation of CO2 W/O Fire Watch as Required by Tech Specs.Caused by Operator Error.Sys Returned to Automatic.Red Tags Used in Future (← links)
  • 05000280/LER-1986-019, :on 860711,automatic Opening of Reactor Trip Breakers Occurred.Caused by Spurious Turbine First Stage Pressure Spike That Unblocked Permissive P.7 (← links)
  • 05000280/LER-1986-020, :on 860609,during Environ Qualification Insp, Limitorque Motor Valve Operator Wiring Found Questionable. Unidentifiable Wiring Introduced Through Plant Field Changes.Wiring Replaced (← links)
  • 05000280/LER-1983-022-03, /03L-0:on 830505,w/unit at Cold Shutdown,Special Test Showed Flow Orifice Used During Control Room Leakage Test Would Not Simulate Emergency Bottle Air Pressurization. Orifice Modified (← links)
  • 05000280/LER-1983-030-03, /03l-0:on 830707,at 100% Power,Breaker for Heat Tracing Circuit 26A on Panel 9 Found Open.Breaker Closed. Circuit Verified Operational (← links)
  • 05000280/LER-1986-028, :on 860925,individual Rod Position Indicators for All Control Rods Moved Down Approx 25 Steps.Caused by Failed Normal Negative Power Supply.Two Negative Power Supplies Replaced & Calibr (← links)
  • 05000280/LER-1986-002, :on 860108,unit Tripped from 97% Power & Specific Activity Sample of Reactor Coolant Exceeded Tech Spec Dose Equivalent I-131 Limit.Caused by Iodine Spike. Level Monitored Every 4 H (← links)
  • 05000280/LER-1986-009, :on 860208,during Startup,Operating Main Feedwater Pump Tripped Due to High Level in Steam Generator C.Caused by Dust Accumulation in Pilot Relay Blocking Air to Valve Operator.Blockage Removed (← links)
  • 05000280/LER-1986-008, :on 860213,unexpected Start of Auxiliary Feed Pump 2-FW-P-3B Occurred.Caused by Open Coil in Bfd Relay AFP-3XB.Relay Replaced & Tested Satisfactorily (← links)
  • 05000280/LER-1986-005, :on 860124,unit Manually Tripped from 42% Power Due to Arcing on Isolated Phase Bus Duct A.Caused by Corrosion on Contact Surfaces of Lugs of Ground Straps. Damaged Section of Duct Replaced & Welded (← links)
  • 05000280/LER-1986-002-01, :on 860119,at 100% Power,Excess Leakage of RCS Noted.Caused by Failed motor-operated Valve Packing & Failed Diesel Generator Diaphragm.Valve Will Be Repacked & Diaphragm Replaced During Next Suitable Outage (← links)
  • 05000280/LER-1986-003, :on 860119,at 97% Power,Reactor Tripped Manually Following Drop of Four Fuel Rods Into Core & Turbine Runback.Caused by Control Rod Logic Cabinet Jump Short.Abnormal Procedure 1.4 Changed (← links)
  • 05000280/LER-1986-001-01, :on 860107,reactor Trip Occurred Due to Loss of Instrument Air.Caused by Hot Gas Bypass Valve in Dryer Improperly Adjusted to Maintain Air Temp Above Freezing. Operator Attempted to Gain Manual Control (← links)
  • 05000280/LER-1986-007, :on 860107,two Bolting Studs in Valve Flange MOV-SI-1890B Failed.Caused by Intergranular Stress Corrosion of Bolting Matl.Insp Conducted & Stud Matl Replaced,As Necessary (← links)
  • 05000280/LER-1984-017, :on 840620,control Rod B-6 Became Stuck at 56 Steps Withdrawn,Resulting in Quadrant Power Tilt of Greater than 2% for More than 24 H.Caused by Spring Clamp Separation.Fuel Assembly Removed from Svc (← links)
  • 05000280/LER-1985-022-01, :on 851121,spurious auto-start of Auxiliary Vent Emergency Fans Occurred.Cause Not Determined.Steam Generator Pressure Returned to Normal & Letdown Trip Valve TV-1204 Opened (← links)
  • 05000280/LER-1985-020, :on 850927,following Controlled Shutdown Due to Hurricane Gloria,Iodine Spike Discovered.Caused by Known Fuel Element Defects in Reactor Core.Level of Dose Equivalent I-131 Monitored Per Tech Spec Table 4.1-2B (← links)
  • 05000280/LER-1985-019, :on 850927,individual Rod Position Indicator for Two Rods Inoperable.Spurious Incorrect Rod Position Indication Is Generic Westinghouse PWR Concern.Portion of Sys Outside Containment Tested & No Problems Found (← links)
  • 05000280/LER-1985-021, :on 851114,unexpected Start of Auxiliary Feed Pump 2-FW-P-3A Occurred.Caused by Open Coil in Bfd Relay AFP-2XA.Relay Replaced & Tested Satisfactorily (← links)
  • 05000280/LER-1986-010, :on 860207,reactor & Turbine Tripped on High Steam Generator Level.Caused by Failure to Adjust Feedback Cam Following Maint.Cam Adjusted & Maint Procedure Revised (← links)
  • 05000280/LER-1986-004, :on 860119,following Manual Reactor Trip, Specific Activity Sample of Primary Coolant Sys Exceeded Dose Equivalent I-131 Level of 1.0 Uci/Cc.Caused by Fuel Element Defects in Reactor Core (← links)
  • 05000280/LER-1985-018, :on 850911,turbine Trip/Reactor Trip Occurred Due to Low Condenser Vacuum Signal.Caused by Operation Error.Covers Placed on Inlet Valve Switches & Operator Reinstructed (← links)
  • 05000280/LER-1985-013, :on 850721,containment Temp Exceeded 120 F for Approx 3 H.Caused by Loss of Component Cooling Chiller Unit. Component Restarted & Chiller Condenser Svc Water Tubes Cleaned (← links)
  • 05000280/LER-1984-004-03, :on 840225,following Shutdown,Specific Activity Sample of Reactor Coolant Showed Peak Dose Equivalent I-131 Level of 1.77 Mci/Cc,Exceeding Tech Spec 3.1.D.2.Caused by Fuel Element Defects in Reactor Core (← links)
  • 05000280/LER-1984-010-03, :on 840517,reanalysis Rept on Compliance to Design Requirements of 10CFR50,App R Received.Insp of Fire Protection Equipment Identified Five Areas of Deficiency. Caused by Changes in NRC Interpretation (← links)
  • 05000280/LER-1984-011-03, :on 840518,operations Personnel Performing Sys Walkdown Following Maint Discovered Intended Heat Sink for Charging Pump Component Cooling Water Sys Isolated.Caused by Inadequate Procedures (← links)
  • 05000280/LER-1984-020, :on 840926,reactor Trip Occurred Due to Reactor Coolant Pump (RCP) Motor C Trip.Caused by Complete Separation of Phase Main Load Connection Bus Bar A.All Bus Bars in RCP Replaced (← links)
  • 05000280/LER-1985-013-01, :on 850721,containment Temp Exceeded 120 F for Approx 3 H.Caused by Loss of Component Cooling Chiller I-CD-REF-IA Due to Tube Fouling on Water Side Causing High Chiller Condenser Pressure (← links)
  • 05000280/LER-1985-017-01, :on 850911,following Reactor trip,I-131 Level Exceeded Tech Spec Limit.Caused by Fuel Element Defects in Reactor Core.Dose Equivalent Monitored Until Less than 1.0 Uci/Cc (← links)
  • 05000280/LER-1985-010, :on 850515,intermediate Range High Flux Trip Bistables NI-35 & NI-36 Tripped at 30% & 31% Power, Respectively.Apparently Caused by Lack of Experience in Developing Intermediate Setpoints (← links)
  • 05000280/LER-1985-011, :on 850626,while Racking Charging Pump B Breaker 15J5 Out for Pump Maint,Normal Feeder Breaker 15H6 for Operating Charging Pump C Tripped Due to Electrical Interlock.Caused by Inadequate Precautions (← links)
  • 05000280/LER-1983-036-03, /03L-0:on 830830,at 100% Power,Low Pressure Carbon Dioxide Sys & Fire Detection Sys Inoperable W/O Fire Watch. Caused by Personnel Error.Fire Watch Posted.Sys Returned to Svc (← links)
  • 05000280/LER-1983-038-03, /03L-0:on 830829,at 100% Power,Svc Water Pumps 1-SW-P-10A & 1-SW-P-10B Failed to Develop Sufficient Discharge Pressure When Redundant Water Supply Header Isolated.Caused by Npsh.Pumps Vented (← links)
  • 05000280/LER-1985-007, :on 850429,turbine/reactor Trip Occurred as Result of Main Feed Pump a Trip.Caused When Valve Open Signal Not Sent to Feed Pump Trip Logic.Valve Position Actuator Arm Modified (← links)
  • 05000280/LER-1985-012, :on 850609,during Testing of Discharge Valves, Chemical Addition Tank Water Level Decreased.Caused by Failed Closed Contact,Resulting in Valve Reopening.Flow Path Isolated & Failed Contacts Replaced (← links)
  • 05000280/LER-1985-009, :on 850512,PORV PCV-1455C Cycled Twice Due to Overpressure Condition.Caused by Failure of Normal Letdown Pressure Control Valve PCV-1145 Due to Positioner Misadjustment.Part Adjusted (← links)
  • 05000280/LER-1985-005-01, :on 850403,operator Discovered Lockout of Automatic Initiation of CO2 for Fire Zone 7 W/O Required Fire Watch.Caused by Misunderstanding Between Personnel Re Fire Zone Tagging (← links)
  • 05000280/LER-1984-001, :on 840106,reactor Trip Occurred W/Unit at 100% Power.Caused by Over Temp delta-t Signal.Feedwater to Steam Generator a Isolated & Source Range Channels Manually Reinstated (← links)
  • 05000280/LER-1984-025, :on 841203,during Refueling Outage W/Plant in Cold Shutdown,Source Range & Intermediate Range Trip Signal Occurred.Caused by Voltage Transient Induced Upon Vital Bus 2 During Replacement of Key Switch (← links)
  • 05000280/LER-1985-002-01, :on 850113,lo-lo Level in Steam Generator B Caused Reactor Scram.Caused by Failure of Personnel to Adequately Control Steam Generator Level.Feedwater Bypass Flow Indication Design Installed (← links)
  • 05000280/LER-1985-006, :on 850128,reactor Trip Occurred Due to Differential Pressure anti-motoring Turbine Trip.Caused by Isolation of Exhaust Pressure Sensing Line Root Valve in anti-motoring Instrumentation.Plant Returned to Svc (← links)
  • 05000280/LER-1985-004, :on 850127,reactor Tripped Due to Closing of Four Turbine Stop Valves.Caused by Insufficient Consideration of Steam Leakage Effect on Plant Parameters. Plant Parameters Returned to Stable Conditions (← links)
  • 05000280/LER-1985-003, :on 850126,reactor Tripped Due to Voltage Transient Induced on Vital Bus I When Momentary Overload Condition Caused Circuit Breaker 13 to Trip Open.Cause Unknown.Plant Returned to Stable Condition (← links)
  • 05000280/LER-1985-001, :on 850101,safe Signal Placed in Loop B Channel 2 of Overtemp Delta T W/O Cognizance of Operations or Instrumentation Staff.Caused by Lack of Administrative Controls.Event Will Be Reviewed (← links)
  • 05000280/LER-1984-027, :on 841218,during Surveillance Testing of Emergency Diesel Generator 3,fire Occurred in Vicinity of Turbocharger.Caused by Leaking Fitting on Fuel Injector Line Which Allowed Fuel Oil to Leak Into Lube Oil (← links)
  • 05000280/LER-1984-026-01, :on 841231,reactor Trip Occurred When Reactor Trip Breaker B Opened.Cause Undetermined.Reactor Trip Breaker B Inspected & Shunt Devices Tested.No Discrepancies Found (← links)
  • 05000280/LER-1984-024, :on 841116,spurious Safety Injection Occurred When Returning Consequences Limiting Safeguards,High Phase (Equivalent to Containment Depressurization Actuation Sys) to Svc.Impact on Unit Minimal (← links)
  • 05000280/LER-1984-023, :on 841113,spurious Safety Injection Received While Technicians Performing Calibr Procedure CAL-63.Caused by Electrical Transient in Instrument Loops (← links)
  • 05000280/LER-1984-021, :on 841028,assigned Fire Watch Not Present at Cable Tunnel Area & Carbon Dioxide (CO2) Fire Sys Locked Out.Caused by Personnel error.CO2 Sys Restored & Personnel Counseled on Importance of Proper Fire Watch (← links)
  • 05000280/LER-1984-018, :on 840823,operator Discovered Air Hose Blocking Open Fire Door Between Equipment Space 1 & Cable Spreading Room.Caused by Misinterpretation of End of Walkdown Procedures.Hose Removed (← links)
  • 05000280/LER-1984-016, :on 840619,automatic Reactor Trip Resulted from Exceeding 10% Power on Two of Four Nuclear Power Channels, Ni 44 & Ni 41,w/turbine Unlatched.Caused by Isolation Valve Malfunction Due to Broken Gear Pin (← links)
  • 05000280/LER-1984-019, :on 840905,control Room Area Emergency Ventilation Sys Technically Inoperable.Caused by post- Maint Testing Oversight.Flow Test Performed on Both Units Relay Room Emergency Ventilation Fans (← links)
  • 05000280/LER-1984-013, :on 840601,w/RCS Solid,At 145 F & 325 Psig,Porv Cycled in Response to Overpressure Condition While Placing Charging Sys in Svc.Caused by Personnel Error (← links)
  • 05000280/LER-1984-015, :on 840613,control Room Operator Observed Loss of Main Feed Pump a & Lowering of Steam Generator Water Levels.Caused by Loosening of Bearing Capscrews.Capscrew & Bolt Torque Specified in Maint Procedure (← links)
  • 05000280/LER-1984-014, :on 840613,specific Activity Sample of Reactor Coolant Showed Peak Dose Equivalent I-131 Level of 1.99 Uci Which Exceeded Tech Spec Limit.Caused by Fuel Element Defects in Reactor Core.Monitoring Performed Every 4 H (← links)
  • 05000280/LER-1984-012-01, :on 840526,specific Activity Sample of Reactor Coolant Showed Peak Dose Equivalent I-131 Level of 1.57 Uci Which Exceeded Tech Spec Limit.Caused by Fuel Element Defects in Reactor Core.Dose Equivalent Monitored Every 4 H (← links)
  • 05000280/LER-1984-005, :on 840301,while Performing Mop 26.9,vital Bus Sola Transformer I-I,vital Buses I & III Mistakenly Cross Connected Out of Phase,Causing Spurious Containment High Pressure & High Steam Flow Signals (← links)
  • 05000280/LER-1984-003-01, :on 840206,reactor Tripped Due to Low Steam Generator Level W/Steam Flow/Feed Flow Mismatch in Steam Generator A.Caused by Tripped Feedwater Breaker Closing. Breaker Replaced (← links)
  • 05000280/LER-1975-014-01, /01T:on 750801,boron Concentration in Accumulator 1C Approx 1,850 Ppm.Caused by Inleakage Through Loop Check Valve.Primary Sys Pressure Increased to Seat Check Valves. Accumulator Drained (← links)
  • 05000280/LER-1975-015-01, /01T:on 750803,leaking Fitting on Overhead Gas Compressor B Resulted in Unplanned Release of Radioactive Matl from Site.Caused by Loose Fitting.Leaking Fitting Repaired (← links)
  • 05000280/LER-1975-017-01, /01T:on 750915,one Channel of Redundant Heat Tracing Failed.Caused by Breaker Trip on Overload Due to Short Circuit by Svc Water Leak.Leak Secured & Transformer Repaired (← links)
  • 05000280/LER-1975-018-01, /01T:on 750924,loop a Instrumentation Drifted Low. Caused by High Moisture Content in Containment Atmosphere. RTD Will Be Repaired or Replaced (← links)
  • 05000280/LER-1975-019-01, /01T:on 750925,loop B Temperature Change Instrumentation Drifted Low.Caused by Moisture Content of Containment Atmosphere.Spare RTD Placed in Svc & Shutdown Terminated (← links)
  • 05000280/LER-1975-022-01, /01T:on 750927,test of Main Steam Safety Valve Setpoint Indicated Four Valves Not within Plus or Minus 1% of Setpoint.Caused by Setpoint Drift.Valves Adjusted & Retested (← links)
  • 05000280/LER-1975-023-01, /01T:on 751013,channels P-1-455,P-1-456 & P-1-457 Found Indicating High by 26.4 psi,42.0 Psi & 29.4 Psi, Respectively.Caused by Overranging of Zero Spring in Prior Calibr.Procedure Revised (← links)
  • 05000280/LER-1975-016-01, /01T:on 750822,Channel II Protection Drifted in Nonconservative Direction.Caused by Incorrect Resistance of Hot Leg Resistance Temp Detector (Rtd).Packing Replaced & RTD Ohmic Characteristic Returned to Normal (← links)
  • 05000280/LER-1975-024-01, /01T:on 750116,containment Leak Rate Test Revealed Overall Integrated Containment Leakage Rate Greater than Acceptable Criterion.Caused by Two Defective Tubes in Steam Generator A.Tubes Plugged (← links)
  • 05000280/LER-1975-025-01, /01T:on 751129,uncontrolled & Unplanned Release of Low Level Radioactive Matl Occurred.Caused by Primary Grade Water Tank 1-PG-TK-1B Overflow Due to Operator Error. Administrative Action Taken (← links)
  • 05000280/LER-1975-026-01, /01T:on 751130,auxiliary Feedwater Pump Discharge Valve MOV-FW-151A Failed to Automatically Open When Main Feed Pumps Locked Out.Caused by Failure of Switch.Adjustment of Lever Arm Corrected Problem (← links)
  • 05000280/LER-1975-027-01, /01T:on 751205,uncontrolled & Unplanned Release of Low Level Radioactive Matl Occurred.Caused by Primary Grade Water Tank 1-PG-TK-1A Overflow Due to Operator Error. Administrative Action Taken (← links)
  • 05000280/LER-1975-028-01, /01T:on 751211,auxiliary Feedwater Pump Discharge Valve MOV-FW-151A Failed to Automatically Open When Low Low Level Experienced During Draining of Steam Generator B. Caused by Malfunction of Timing Relay (← links)
  • 05000280/LER-1975-031-01, /01T:on 751219,steam Generator C Pressure Indication 494 Channel II Failed High.Caused by Frozen Sensing Line.Louvers Closed & Sealed Allowing Line to Thaw & Transmitter Returned to Normal Svc (← links)
  • 05000280/LER-1975-030-01, /01T:on 751230,two Component Cooling Water/Svc Water HX Tubes Noted Leaking Indicating Inadvertent Release of Low Level Radioactive Water to James River.Caused by Plugs Loosened During Operation (← links)
  • 05000280/LER-1976-011-03, /03L:on 760823,diaphragm in Valve 1-CH-125 Failed Causing Leakage of Boric Acid.Caused by Normal Operation. Valve Repaired (← links)
  • 05000280/LER-1976-012-03, /03L:on 760909,low Pressure Alarm Occurred on Safety Injection Accumulator C.Caused by HCV 1936 Partially Open & Body to Bonnet Leaks on HCV-1898 & 1549.Repairs Made on HCV 1936,1898 & 1549 (← links)
  • 05000280/LER-1976-013-03, /03L:on 760916,normal Boric Acid Makeup to Vol Control Tank Could Not Be Accomplished Due to Plugging of CVCS Line 1 inch-CH-56-152.Caused by Routine Use of Line. Blank Flange Installed to Clear Lines (← links)
  • 05000280/LER-1976-015-03, /03L:on 761018,MOV-CW-100A Failed to Close When Train B Cls Hi Hi Signal Actuated.Caused by Loose Terminal Screw on Cable XI at Breaker 1J1-123.Screw Tightened (← links)
  • 05000280/LER-1976-016-03, /03L:on 761101,comparator TC-1-432C Failed to Trip.Caused by Power Capacitor Malfunction.Comparator Replaced (← links)
  • 05000280/LER-1976-017-03, /03L:on 761026,relay VS-103A Failed on Energized Position of Train a Safety Injection Initiation.Caused by Dirty Magnetic Field Pole Surface.Assemblies & Magnetic Field Pole Surface Cleaned (← links)
  • 05000280/LER-1976-018-03, /03L:on 761103,discovered Manipulator Crane Area Monitor Inoperable.Caused by Corrosion of 12 Volt & 22 Volt Power Cables.Monitor Repaired & Returned to Svc.W/ (← links)
  • 05000280/LER-1976-001-01, /01T:on 760302,discovered Process Vent Air Particulate Monitor Isolated.Caused by Technician Error. Monitor Returned to Svc & Technician Instructed to Ensure Full Operability (← links)
  • 05000280/LER-1976-002-01, /01T:on 760313,determined That Worst Break LOCA Core Thermal Transient Analysis Inaccurate Since Effects of Steam Generator Tube Plugging Not Included.Cause Unknown. Research Being Conducted (← links)
  • 05000280/LER-1976-003-01, /01T:on 760721,discovered Outputs of Two Pressure Switches PS-LM-100C & 100D Still Jumpered to Prevent Initiation of Cls Containment Hi Signal.Caused by Failure to Review Jumper Log at Proper Time (← links)
  • 05000280/LER-1976-004-01, /01T:on 760723,indicated Axial Flux Difference Found Outside +6% to -9% Band.Caused by Computer Using Delta I Target Value of -2.0% Instead of 6.5%.Value of Delta I Brought within Correct Target Band (← links)
  • 05000280/LER-1976-002-03, /03L:on 760318,auxiliary Feedpump Discharge Valve MOV-FW-151A Failed to Open When Main Feedpump Breakers Opened.Caused by Timing Relay Plunger Failure to Activate Micro Switch.Timing Relay & Switch Replaced (← links)
  • 05000280/LER-1976-003-03, /03L:on 760326,ruptured Diaphragm in Valve 1-CH-85 Caused Exccessive Leakage of Borated Water.Caused by Normal Wear.Power Rampdown Commenced,Valve Repaired & Placed Back in Svc (← links)
  • 05000280/LER-1976-004-03, /03L:on 760416,during Start Test,Emergency Diesel Generator 1 Damaged Due to Flooded Piston Cylinder 17. Caused by Crack in Cylinder Head.Engine Repaired (← links)
  • 05000280/LER-1976-007-03, /03L:on 760702,during Preparation for Start Test of Emergency Diesel Generator 1,water Observed Coming Out of Cylinder 19.Caused by Crack in Cylinder.Engine Repaired by Replacing Cylinder Head & Gasket (← links)
  • 05000280/LER-1976-008-03, /03L:on 760702,safety Injection Accumulator B Indicated 1,928 Ppm Boron.Caused by Leaking Check Valves 1-SI-128 & 1-SI-130.Accumulator Recirculated in Raw Water Storage Tank to Increase Boron Concentration (← links)
  • 05000280/LER-1976-005-01, /01T:on 760805,NSSS Vendor Informed of Error Discovered in LOCA ECCS Analysis.Reactor Vessel Upper Head Water Temp Should Be Assigned Value Similiar to Hot Leg Temp (← links)
  • 05000280/LER-1976-006-01, /01T:on 760805,NSSS Vendor Informed That Rod Bow Effect on Thermal Margins Exceeded Expectations.Cause Unknown (← links)
  • 05000280/LER-1976-007-04, /04T:on 760913,during Recalculations of Previous 12 Months,Gaseous & Airborne Particulate Release,Monthly Average,Figured at 0.188% Higher than Limit.Caused by Procedural Errors (← links)
  • 05000280/LER-1976-008-01, /01T:on 761007,broken Stud from Steam Generator 2A Girth Strap Discovered.Caused by Degradation of Stud Coating & High Stresses Developed During Mfg.Studs Replaced.Addl Rept Encl (← links)
  • 05000280/LER-1977-001-03, /03L:on 761113,pressurizer Safety Valve Setpoints for Valves SV-1551A & SV-1551B Found Below 2,485 Psig Requirement.Caused by Setpoint Drift.Testing Procedure Will Be Revised (← links)
  • 05000280/LER-1977-002-03, /03L:on 770120,valves SV-MS-101B & SV-MS-102B Exceeded Setpoint Limits of 1,085 & 1,095 Psig,Respectively. Caused by Setpoint Drift.Valves Adjusted (← links)
  • 05000280/LER-1977-004-03, /03L,on 770126,reactor Exceeded 90% Power Hold Point Prior to Recalibr of ex-core Symmetrical Offset Detector Sys to in-core Instrumentation Sys.Caused by Personnel Error.Power Reduced (← links)
  • 05000280/LER-1977-005-03, /03L:on 770126,when Recirculation to Boron Injection Tank Halted to Repair Leaking diaphragms,150 Mwe/H Rampdown Initiated.Caused by Faulty Diaphragm Matl.Valves Will Be Replaced Periodically (← links)
  • 05000280/LER-1977-006-03, /03L:on 770208,charging Pump Cooling Water Pump 1-CC-P-2A Tripped Due to Thermal Overload.Caused by Faulty Motor Bearings.Bearings Replaced & Minor Mechanical Defects Corrected (← links)
  • 05000280/LER-1977-007-03, /03L:on 770215,safety Valve SV-MS-101A Lifted Prematurely at Approx 950 Psi,Below Normal Setpoint of 1,085 Psi.Caused by Torque Limiting Device Setting Low Causing Drift.Safety Valves Reset (← links)
  • 05000280/LER-1977-008-03, /03L:on 770220,when Recirculation Halted to Replace Leaking Diaphragm in Valves 1-CH-98,150 Mwe/H Rampdown Initiated.Draphragm Failure Caused by Valve Overtightening When Shutting (← links)
  • 05000280/LER-1977-009-03, /03L:on 770219,chemical Addition Tank Discharge Valve MOV-CS-102A Position Indicating Lights Extinguished. Caused by Incorrectly Wired Switch.Maint Procedure Revised (← links)
  • 05000280/LER-1977-010-03, /03L:on 770328,high Steam Flow Relay FC-485-XA Malfunctioned.Caused by Foreign Matl Impregnating Bf Relay. Debris Removed (← links)
  • 05000280/LER-1975-001-03, /03L:on 750218,pump 1-SW-P-6 Supplying Radiation Monitor RM-SW-107 Failed.Caused by Erosion.Sampling Initiated Until Design Mod Installed (← links)
  • 05000280/LER-1975-004-01, /01T:on 750131,steam Generator C Narrow Range Level Channel 2 Indication Found Drifted 65%.Caused by Magnetic Sludge Deposits in Sensing Lines.Channel Placed in Trip Mode & Lines Blown Down (← links)
  • 05000280/LER-1975-005-01, /01T:on 750214,pressurizer Pressure Comparator Found Out of Calibr.Caused by Component Failure of Hagan Computer Sys Model 118 Signal Comparator A56Y 4111082-001. Comparator Replaced (← links)
  • 05000280/LER-1975-006-01, /01T:on 750215 & 19,channel 1 Overpower Setpoint Failed High.Caused Under Investigation.Low Level Amplifier TM-1-412A Replaced & Instrument Calibr Performed (← links)
  • 05000280/LER-1975-007-01, /01T:on 750313,uncontrolled & Unplanned Release of Low Level Radioactive Matl Made to Discharge Canal.Caused by Personnel Oversight.Operators Reinstructed on Maintaining Proper Control & Documentation (← links)
  • 05000280/LER-1975-008-01, /01T:on 750402,nuclear Axial Offset Out of Target Band 5% for 1 1/2 H During Startup.Caused by Personnel Error & Inadequate Procedure.Procedure Revised (← links)
  • 05000280/LER-1975-009-01, /01T:on 750412,process Vent Gaseous Radiation Monitor Found in Calibr Mode Resulting in Failure to Monitor Process Vent Sys.Caused by Operator Error.Personnel Instructed on Seriousness of Situation (← links)
  • 05000280/LER-1975-010-01, /01T:on 750412,valve FCV-GW-260 Failed to Shut as Required by Tech Specs.Caused by Westinghouse Model MG-6 Relay in Control Circuit for Valve Found Stuck in Operate Position.Relay Cleaned & Adjusted (← links)
  • 05000280/LER-1975-011-01, /01T:on 750416,pinhole Leak Developed in Recirculation Line on Charging Pump 2-CH-P-1C Causing Ventilation Vent Sampler to Alarm.Leak Isolated (← links)
  • 05000280/LER-1975-012-01, /01L:on 750430,emergency Diesel Generator 3 Failed. Caused by Partially Stripped Teeth on Planetary & Spline Shaft Gears.Engine Speed & Loading Verified Sufficient to Disengage Mechanical Drive to turbo-blower (← links)
  • 05000280/LER-1975-013-01, /01L:on 750516,chemical Addition Tank Discharge Valve MOV-CS-102B Failed to Function Properly During Periodic Test.Caused by Small Debris in Valve Seat.Valve Reassembled & Tested Satisfactorily (← links)
  • 05000280/LER-1983-058-03, /03L-0:on 831215 & 24,main Feed Regulator Valve C Did Not Fully Close Upon Receipt of Low Tave Isolation Signal Following Reactor Trip.Caused by Mechanical Binding. Cage Tightened & Operator Assembly Adjusted (← links)
  • 05000280/LER-1983-041-03, /03L-0:on 830709,while Attempting to Energize Control Room Air Conditioning Chiller A,Local Control Panel Caught Fire.Chiller a Removed from Svc W/Chiller C Out of Svc for Maint,Contrary to Tech Specs (← links)
  • 05000280/LER-1982-094-03, TV-SS-106A & B (Reactor Coolant Hot Leg Sample Trip Valves) Failed to Fully Close After RCS Sample.Cause Undetermined.Valves Tested Satisfactorily & Returned to Svc (← links)
  • 05000280/LER-1984-009, :on 840407,specific Activity Sample of Reactor Coolant Showed Peak Dose Equivalent I-131 Level Exceeding Tech Spec Limit.Caused by Fuel Element Defects in Reactor Core.Level Monitored Every 4 H (← links)
  • 05000280/LER-1984-008-01, :on 840407,following Reactor Trip,Source Range NI-31 Failed high,NI-32 Declared Inoperable Due to Noise.Caused by Faulty preamp.NI-31 Preamp & NI-32 Detector Replaced (← links)
  • 05000280/LER-1984-007-06, :on 840328,instrument Technicians Determined That Main Feed Regulating Valves Would Not Have Tripped Closed Upon Receipt of Feedwater Isolation Signal.Caused by Unapproved Work Procedure.Procedure Corrected (← links)
  • 05000280/LER-1984-006-01, :on 840301,as Result of Snubber Functional tests,69 of 226 Snubbers Failed to Meet Acceptance Criteria. Cause Not Stated.Snubber Program Revised & Associated Procedures Reviewed (← links)
  • 05000280/LER-1982-127-03, /03L-0:on 821228,while Gaseous Release in progress,RR-175 Indicated off-scale Process Vent Gaseous Radiation Monitor RM-GW-102.Caused by Failure of Discriminator Printed Circuit Board.Board Replaced (← links)
  • 05000280/LER-1982-125-03, /03L-0:on 821221,w/unit at Full Power,Periodic Test 2.1 Revealed That Output of Loop a Delta T Summator Below Acceptable Limits.Caused by Instrument Drift.Summator Recalibr & Returned to Svc (← links)
  • 05000280/LER-1983-054-03, /03L-0:on 831123,rod Position Indicators for Rods G-13 & N-9 Found More than 12 Steps Out of Alignment.Caused by Instrument Drift.Indicators Calibr (← links)
  • 05000280/LER-1983-053-03, /03L-0:on 831122,RCS Activity Samples Indicated Dose Equivalent I-131 Greater than Allowable Limit.Caused by Fuel Element Defects in Reactor Core.Accelerated Sampling Frequency Implemented (← links)
  • 05000280/LER-1983-056-03, /03L-0:on 831201,feeder Breakers for Heat Tracing Panels 2A1 & 2B2 Tripped.On 831202,feeder 2A1 Tripped Again. Caused by Ground Fault Due to Extensive Insulation Work on Various Boric Acid Lines.Feeder Breakers Reset (← links)
  • 05000280/LER-1983-055-03, /03L-0:on 831126,core Cooling Monitor a Observed Displaying Erratic Indications & Declared Inoperable.Caused by Faulty Computer Card.Replacement Card Installed (← links)
  • 05000280/LER-1983-052-03, /03L-0:on 831118,both Charging Pump Component Cooling Water Intermediate Seal Coolers Isolated.Caused by Inadvertent Isolation of Cooler A.Component Cooling Water to Coolers Unisolated (← links)
  • 05000280/LER-1983-051-03, /03L-0:on 831110,suction Line for Containment Vacuum Pump B 1-CV-P-1B Inadvertently Blank Flagged.Caused by Incorrect Identification by Operator.Flange Removed & Pump Verified Operable.Operator Disciplined (← links)
  • 05000280/LER-1983-050-03, /03L-0:on 831103,feeder Breaker for Heat Tracing Panel 2A1 Tripped.Caused by Breaker Tripping on Ground Fault.Breaker Reset (← links)
  • 05000280/LER-1983-049-03, /03L-0:on 831102,performance of Heat Tracing Periodic Test Revealed Ampere Readings for Heat Tracing Circuits 23A,24C,22A & 24D Not within Test Limits.Caused by Excessive Heat.Heat Tracing Replaced (← links)
  • 05000280/LER-1983-048-03, /03L-0:on 831024,discharge Pressure of Charging Pump B Pump CC Decreased to Point Which Automatically Started Redundant Pump.Caused by Closed Valve LCV-CC-001 (← links)
  • 05000280/LER-1983-047-03, /03L-0:on 831009,heat Tracing Panel 2A3 Found Tripped & Could Not Be Reset.Cause Not Determined.Circuit Breaker Replaced & Circuit Returned to Svc (← links)
  • 05000280/LER-1983-046-03, /03L-0:on 831008,heat Tracing Panel 2A1 Found Deenergized.Caused by Damaged Heat Tape & Resistance Temp Device (RTD) on Circuit Resulting in Breaker Overload.Heat Tracing & RTD Replaced (← links)
  • 05000280/LER-1983-045-03, /03L-0:on 831010 & 17,core Cooling Monitor a Declared Inoperable Following Erratic Indication.Cause of 831010 Event Not Determined.Event on 831017 Caused by Bad Connector in Power Supply.Supply Replaced (← links)
  • 05000280/LER-1983-044-03, /03L-0:on 830920,Periodic Test PT-39B-1 Revealed Snubber 1-SHP-HSS-1B Inoperable & 1-PT-39B-2 Revealed Snubbers 1-RC-HSS-146-147 Inoperable.Caused by Snubber Binding on Pipe & Empty Fluid Reservoir (← links)
  • 05000280/LER-1983-042-03, /03L-0:on 830917,svc Water Pump 1-SW-P-10A Developed Low Discharged Pressure (9-10 Psig),Causing 1-SW-P-10B to auto-start.Caused by Clogged Suction Strainer. Strainer Cleaned (← links)
  • 05000280/LER-1983-040-03, /03L-0:on 830830,w/unit at 100% Power,Fire Marshall Discovered That Fire Door 42 Would Not Latch.Caused by Worn Hinges.Hinges Replaced (← links)
  • 05000280/LER-1984-002-02, :on 840118,control Room Indications & Annunciators Behaved Erratically Due to Voltage Spike.Caused by Cable Falling Out of Breaker Due to Loose Screw.Cable Reconnected (← links)
  • 05000280/LER-1983-039-03, /03L-0:on 830831,svc Water Pump 1-SW-P-10A Failed to Maintain Sufficient Discharge Pressure When Control Room Air Conditioning Unit C Placed in Svc.Caused by Insufficient Npsh.Flow Throttled (← links)
  • 05000280/LER-1984-001-01, :on 840106,overtemp delta-T Signal Tripped Reactor.Caused by Power Surge During Gaitronics Sys Maint. Gaitronics Sys Test Will Be Written & Performed & Results Will Be Used to Develop Procedure (← links)
  • 05000280/LER-1983-059-03, /03L-0:on 831225,rod Position Indicators G-3 & F-12 Found Indicating More than 12 Steps from Bank.Caused by Indicator F-12 Signal Conditioning Module Drift & G-3 Sticking meter.G-3 Repaired & F-12 Recalibr (← links)
  • 05000280/LER-1983-006-03, /03L-0:on 830129,w/Unit 1 at 94% Power & Unit 2 at 100% Power,Boric Acid Transfer Pump 1-CH-P-2B Tripped on High Amperes While Running & Pump 1-CH-P-2D Tripped While Attempting to Start.Caused by Boric Acid Crystals (← links)
  • 05000280/LER-1982-129-03, /03L-0:on 821202,performance of Periodic Test 27 Revealed Amp Reading for Panel 1,circuit 23A Not within Acceptance Criteria.Caused by Faulty Thermostat.Thermostat Replaced (← links)
  • 05000280/LER-1982-117-03, /03L-0:on 821129,specific Activity Samples of RCS Indicated Dose Equivalent I-131 Level Greater than Tech Spec Limit.Caused by Fuel Element Defect in Reactor Core. Accelerated Sampling Frequency Implemented (← links)
  • 05000280/LER-1982-105-03, /03L-0:on 821123,amplifier Reading for Heat Tracing Panel 9,circuit 7A,fell Below Acceptance Criteria.On 821126,low Reading Detected for Panel 8.Caused by Excessive Heat.Defective Heat Tracing Replaced & Tested (← links)
  • 05000280/LER-1983-057-03, /03L-0:on 831215,RCS Activity Samples Indicated Dose Equivalent I-131 Limit Greater than Tech Spec Limit. Caused by Known Fuel Element Defects in Reactor Core. Accelerated Sample Frequency Implemented (← links)
  • 05000280/LER-1983-043-03, LER83-043/03L-0:on 830914,following Reactor Trip,Flow Control Valve (FCV) Failed to Close Upon Receipt of Feedwater Isolation Signal.Caused by Malfunctioning Solenoid Valve & FCV-1488 Restricted by Antirotation Device (← links)
  • 05000280/LER-1983-029-03, /03L-0:on 830714,control Rods Powered from Cabinet 2BD Would Not Respond During PT-6.Caused by Blown Fuse in three-phase Power Supply for Cabinet 2BD.Fuse Replaced & Rod Movement Verified (← links)
  • 05000280/LER-1983-028-03, /03L-0:on 830702,carbon Dioxide Tank Level Discovered to Be Less than 75%.Caused by Operator Not Monitoring Purge.Fire Watches Established & Tank Refilled to Required Level (← links)
  • 05000280/LER-1983-026-03, /03L-0:on 830616 & 17,containment Partial Air Pressure at Value Greater than Tech Spec Requirements.Caused by Svc Water Temp Increasing Faster than Containment Pressure Decreasing (← links)
  • 05000280/LER-1983-027-03, /03L-0:on 830615,intermediate Range High Flux Trip Setpoint Found Nonconservative During Review of Cycle 7 & Cycle 8 Data.Caused by Improper Assessment of Effect of New Core Design on Instrumentation (← links)
  • 05000280/LER-1983-035-03, /03L-0:on 830812,heat Tracing Panel Found Deenergized.Caused by Open Breaker Due to Ground Fault. Metal Band Removed & Panel & Associated Circuit Energized (← links)
  • 05000280/LER-1983-034-03, /03L-0:on 830728,emergency Diesel 3 Inadvertently Removed from Svc.Caused by Misunderstanding Between Shift Supervisor & Const Electricians & Loss of Administrative Control.Diesel Returned to Svc (← links)
  • 05000280/LER-1983-033-03, /03L-0:on 830802,torque Switch for MDV-1289B Removed,Rendering Valve Inoperable.Caused by Personnel Error in Performing Work on Wrong Valve.Torque Switch Replaced (← links)
  • 05000280/LER-1983-032-03, /03L-0:on 830718,svc Water Pump 1-SW-P-10B Would Not Develop Sufficient Discharge Pressure.Caused by Valve Not Properly Sealed Due to Matl in Svc Water.Check Valve Flushed Out (← links)
  • 05000280/LER-1983-031-03, /03L-0:on 830710,w/Unit 1 at 100% Power, Containment Temp Exceeded 120 F for Approx 3 H.Caused by Incorrect Data Supplied by Unit 2 Computer.Data Corrected (← links)
  • 05000280/LER-1983-020-03, /03L-0:on 830408,20 of 58 Snubbers Failed to Meet Acceptance Criteria Stipulated in Periodic Test.Caused by Seal Degradation.Snubbers Either Readjusted,Repaired or Replaced (← links)
  • 05000280/LER-1983-019-03, /03L-0:on 830408,performance of Periodic Test 1-PT-39B-2 Revealed Snubbers 1-WFPD-HSS-15,1-RC-HSS-115, 1-SI-HSS-27A,1-RH-HSS-12 & 1-SI-HSS-28 Inoperable.Caused by Fluid Leaks & Loose Pipe Clamp.Snubbers Replaced (← links)
  • 05000280/LER-1983-018-03, /03L-0:on 830411,Type C Testing (PT-16.4 Containment Isolation Valve Leakage) Performed During Spring 1983 Refueling Outage Disclosed as-found Leakage Exceeding Allowable Rate.Caused by Normal Wear.Valves Repaired (← links)
  • 05000280/LER-1983-016-03, /03L-0:on 830310,undervoltage (UV) Relay Setpoints for Bus a & Phase A-B UV Relay Setpoint for Bus C Indicated Less than Tech Specs.Caused by Instrument Drift.Undervoltage Relays Reset (← links)
  • 05000280/LER-1991-002-02, :on 910326,two Charging Pumps & One Charging Pump Svc Water Pump Inoperable Causing Instrument Air Failure.Caused by Personnel Error.Charging Pump Returned to Svc (← links)
  • 05000280/LER-1983-015-03, /03L-0:on 830307,w/fuel Movement in Progress,Valve 1-GN-3 Removed,Resulting in Unisolated Path from Containment to Outside Atmosphere & Violation of integrity.Open-ended Pipe Capped (← links)
  • 05000280/LER-1983-012-03, /03L-0:on 830209,w/unit at Cold Shutdown & Overpressure Mitigating Sys Enabled,Both Pressurizer Porvs, PCV 1455C & 1456,declared Inoperable.Caused by Low Air Pressure in Backup Bottle Air Supply (← links)
  • 05000280/LER-1983-013-03, /03L-0:on 830215,during Cold Shutdown,Valve MOV-SW-102B Would Not Cycle.Caused by Damaged Gears Linking Motor to Valve Actuator.Gears Replaced (← links)
  • 05000280/LER-1983-024-03, /03L-0:on 830517,RHR Pump B Removed from Svc, Rendering RHR Loops Inoperable.Caused by Pump Cavitation Due to Inaccurate Standpipe Level Indication.Rcs Level Increased.Rhr Pump Vented & Returned to Svc (← links)
  • 05000280/LER-1983-023-03, /03L-0:on 830513,steam Generator Blowdown Released to Discharge Canal W/O Monitor.Caused by Procedures Not Requiring Flow Verification in Radiation Monitor. Blowdown Checklist Will Be Modified (← links)
  • 05000280/LER-1982-007-03, /03L-0:on 820119,PT-27C Revealed Amp Reading for Heat Tracing Panel 9,circuit 20B Below Acceptance Criteria. Caused by Excessive Heat.Defective Heat Tracing Replaced & Tested (← links)
  • 05000280/LER-1982-010-03, /03L-0:on 820105,while Removing Unit from Svc, Spurious Safety Injection Signal Generated & Trip Valve Failed to Close.Cause Not Found.Investigation Continuing (← links)
  • 05000280/LER-1982-008-03, /03L-0:on 820121,instrument Malfunction Resulted in Loss of All Pressurized Heaters.Caused by Short in One Pressurized Level Comparator.Short Repaired & Pressurizer Control Sys Returned to Normal Condition (← links)
  • 05000280/LER-1982-003-03, /03L-0:on 820122,loss of Boric Acid Flow to Blender Observed.Caused by Inadequate Insulation on FT-1113 & Adjacent Piping.Blockages Removed or Freed & Addl Insulation Added to Prevent Recurrence (← links)
  • 05000280/LER-1982-002-03, /03L-0:on 820120,both Containment Pumps Declared Inoperable by Failing to Develop Flow.Caused by Water Accumulation in Common Discharge Piping.Piping Drained & Pumps Returned to Svc (← links)
  • 05000280/LER-1982-018-03, /03L-0:on 820121,PT-27 Revealed Amp Readings for Heat Tracing Panels 8 & 9,circuit 13A,below Acceptable Criteria.Caused by Excessive Heat.Defective Heat Tracing Replaced & Tested (← links)
  • 05000280/LER-1982-015-03, /03L-0,on 820129,while Performing PT-33,low Control Room Envelope Pressure of .045 Inches of Water Found.Caused by Deterioration of Weather Stripping Around Doors.Weather Stripping Replaced (← links)
  • 05000280/LER-1982-012-03, /03L-0,on 820131,amp Readings for Heat Tracing Circuits 23A & C on Panels 8 & 9 Found Below Acceptance Criteria.Apparently Caused by Inadvertent Damage to Heat Tracing Tape During Cleanup Operations.Tape Replaced (← links)
  • 05000280/LER-1982-009-03, /03L-0,on 820128,inadequate Svc Water Flow Resulted in Higher 2-CH-P-1C Lubricating Oil Temp.Pump Declared Inoperable.Caused by Foreign Object in Svc Water Temp Control Valve Body.Object Removed (← links)
  • 05000280/LER-1982-014-03, /03L-0:on 820127,amp Readings for Heat Tracing Panel 8,circuit 2B Found Below Acceptance Criteria.Caused by Excessive Heat Tape.Defective Heat Tracing Replaced. Manner in Which Borated Lines Are Heat Traced Changed (← links)
  • 05000280/LER-1983-009-03, /03L-0:on 830204,during 85% power,PT-2.26 Revealed That MOV-1535 & MOV-1536 Would Not Fully Cycle.Cause Undetermined.Valves Will Be Inspected During Current Outage (← links)
  • 05000280/LER-1983-008-03, /03L-0:on 830204,during 85% Power,Results of PT-2.26 Indicated That PCV-1455C Would Not Cycle.Caused by Apparent Valve Binding.Valve Will Be Inspected & Repaired as Necessary During Current Outage (← links)
  • 05000280/LER-1983-007-03, /03L-0:on 830204,at 85% Power,Latch Mechanism of Fire Door 20 Taped Over,Causing Fire Barrier to Be Inoperable.Caused by Const Personnel Error.Tape Removed & Door Returned to Operable Status (← links)
  • 05000280/LER-1983-005-03, /03L-0:on 830204,10 & 11 W/Unit at 85% & Effluent Release in Progress,Radiation Recorder RR-100 Began Printing Erratically.Caused by Poor Electrical Connection on Erratic Recorder.Recorder Swapped W/Properly Functioning Unit (← links)
  • 05000280/LER-1983-004-03, /03L-0:on 830202,w/Units 1 & 2 at 88% & 100% Respectively,Emergency Diesel Generator 3 Declared Inoperable Due to Leaking Cooling Water Pump.Caused by Worn Shaft Seal.Seal Replaced & Generator Tested Satisfactorily (← links)
  • 05000280/LER-1983-003-01, /01T-0:on 830209,MOV-SW-103A,B,C & D & MOV-SW-203A,C & D Failed to Open Upon Demand from Control Room.Caused by Corrosion on Motors of MOV-SW-103C & 203C & Torque Switch of 103B.Valves Repaired (← links)
  • 05000280/LER-1982-126-03, Rod Position Indication for Control Rod F-4 Indicated Erratically & Fluctuated Greater than 12 Steps.Cause Unknown.Erroneous Signal Suspected of Being Inside Containment.Testing Underway (← links)
  • 05000280/LER-1983-002-03, /03L-0:on 830114,w/unit at Full Power,Steam Generator C Level Indication LT-1-495 Drifted High.Caused by Leak on Transmitter Ref Leg Condensate Pot Root Valve. Repairs Will Be Performed During Next Outage (← links)
  • 05000280/LER-1982-128-03, /03L-0:on 821228,at 100% power,PT-27D Revealed Amp Readings for Heat Tracing Panel 9,circuit 4B Above Test Criteria.Caused by Excessive Heat.Defective Heat Tracing Replaced & Tested.Design Change Initiated (← links)
  • 05000280/LER-1982-107-03, /03L-0:on 821221,at 100% Power,Testing Revealed Amp Readings for Heat Tracing Panels 8 & 9,redundant Circuits 17A Below Tech Spec Limits.Caused by Excessive Heat.Defective Heat Tracing Replaced (← links)
  • 05000280/LER-1982-110-03, /03L-0:on 821104 & 18,specific Activity Samples of RCS Indicated Dose Equivalent I-131 Level Greater than Tech Specs.Caused by Fuel Element Defect in Reactor Core. Sampling Frequency Implemented Until Level Decreased (← links)
  • 05000280/LER-1983-017-03, /03L-0:on 830319,containment Isolation Valve 1-CC-242 Discovered to Have Been Moved Approx 10 Inches W/O Performing Seismic Analysis.Caused by Defective Procedures. Formal Inservice Insp Repair Program Implemented (← links)
  • 05000280/LER-1981-072-03, /03L-0:on 811125 & 26,specific Activity Sample of RCS Indicated Dose Equivalent I-131 Levels Greater That Tech Spec Limit.Caused by Fuel Element Defect in Reactor Core. Accelerated Sampling Frequency Implemented (← links)
  • 05000280/LER-1981-070-03, /03L-0:on 811125,during Investigation of Deviation Involving Fire Protection Sys,Discovered That Fire Hydrant Isolation Valve 1-FP-127 Had Not Been Position Verified Monthly.Caused by Administrative error.PT-24.7 Revised (← links)
  • 05000280/LER-1981-069-03, /03L-0:on 811114,w/unit at Cold Shutdown for Refueling & Three Loops Isolated & Drained,Rhr Pump B Was Removed from Svc Due to High Bearing Temp.Caused by Lack of Lubrication to Motor Upper Thrust Bearing.Assembly Replaced (← links)
  • 05000280/LER-1983-011-03, /03L-0:on 830211,instrument Air Check Valve to PORV Found Installed Backwards.Caused by Installation Error During Implementation of Design Change 79-53.Valve Removed & Reinstalled in Correct Orientation (← links)
  • 05000280/LER-1983-010-03, /03L-0:on 830207,activity Samples of RCS Indicated Dose Equivalent I-131 Level Greater than Tech Spec Following Reactor Trip.Caused by Fuel Element Defect in Reactor Core. Accelerated Sampling Frequency Implemented (← links)
  • 05000280/LER-1982-116-03, /03L-0:on 821113,containment Spray Chemical Addition Tank Level Decreased Below Tech Spec Limit.Caused by Loss of Vol Due to Leakage Past Manual Isolation Valve During Maint.Valve Torqued Shut.Tank Refilled (← links)
  • 05000280/LER-1982-113-03, /03L-0:on 821121,radiation Monitor Recorder Found Inoperable.Caused by Slipped Drive Cable.Drive Cable Reinstalled & Recorder Returned to Svc (← links)
  • 05000280/LER-1982-121-03, /03L-0:on 821026,alarm Setpoint for Liquid Waste Monitor RM-LW-108 Exceeded Allowable Tech Spec Limits.Caused by Instrument Drift.Operator Took Administrative Control for High Alarm Isolation.Monitor Recalibr (← links)
  • 05000280/LER-1982-120-03, /03L-0:on 821020,w/unit at 100%,both Containment Vacuum Pumps Declared Inoperable.Caused by Sliding Vanes Becoming Bound to Respective Guide Slots Due to Water Damage to Carbon Vanes.Broken Belt Replaced on Pump 1-CV-P-1B (← links)
  • 05000280/LER-1982-118-03, /03L-0:on 821015,reservoir Tubing for Snubber 1-SHP-HSS-34A Found Cut.Caused by Personnel Error During Removal of Snubber Reservoirs & Unused Tubing.Tubing Repaired (← links)
  • 05000280/LER-1982-111-03, /03L-0:on 821017,control Rod P-8 of D Bank Dropped Causing Turbine Runback.Caused by Faulty Contact Pin in Stationary Coil Plug.Plug Repaired (← links)
  • 05000280/LER-1982-112-03, /03L-0:on 821017,one of Two Required Boric Acid Flow Paths to Core Became Unavailable & Boron Injection Tank Recirculation Terminated Due to Temporary Loss of Boric Acid Transfer Pump 1-CH-P-2A.Caused by Motor Trip (← links)
  • 05000280/LER-1982-103-03, /03L-0:on 820927,amp Readings for Heat Tracing Panel 2 Circuit 24D Found Below Acceptance Level.Cause Unknown.Defective Heat Tracing Replaced & Design Change Initiated (← links)
  • 05000280/LER-1982-102-03, /03L-0:on 820923,discovered Pin Attaching Snubber 1-SHP-HSS-35B to Main Steam Line Partially Out & Snubber Cocked.Caused Undetermined.Snubber Straightened & Pins Properly Installed (← links)
  • 05000280/LER-1982-100-03, /03L-0:on 820922,pump 1-SWP-10B Became Airbound During Use of Air to Clear Sensing Lines to Water Strainers in Delta P Gauges.Caused by Injecting Air Into Svc Water Lines Upstream of Pump.Personnel Reinstructed (← links)
  • 05000280/LER-1982-099-03, /03L-0:on 820920,radiation Monitors RJ-GW-101 & 102,VG-103 & 104 & RM-LW-108 Lost Power for 10 Minutes. Caused by Blown Supply Fuse Due to Inadvertent Shorting of Control Relay to Ground.Fuse Replaced (← links)
  • 05000280/LER-1980-019-03, Error Discovered in Vol of Contaminated Drain Tanks for Increasing Tankage.Caused by Erroneous Labeling.Vols Relabeled & Other Tanks Evaluated for Use in Liquid Waste Release Calculations (← links)
  • 05000280/LER-1982-053-03, /03L-0:on 820914,pump 2-SW-P-10A Lost Suction Pressure.Caused by Insufficient NPSH Due to Throttled Svc Water to Air Conditioning Chillers.Pump Vented to Restore NPSH (← links)
  • 05000280/LER-1982-098-03, /03L-0:on 820919,liquid Waste Monitor RM-LW-108 Alarm Setpoint Exceeded Tech Specs Limit During Performance of PT-26.1.Caused by Defective Log Rate Board.Defective Parts Replaced & Meter Calibr (← links)
  • 05000280/LER-1982-087-03, /03L-0:on 820901 & 20,pump 1-SW-P-10A Experienced Loss of Suction Power & on 820901,14 & 20,pump 1-SW-P-10A Experienced Similar Loss of Suction.Cause Due to Insufficient Npsh.Svc Water Replaced.Svc Water Pumps Vented (← links)
  • 05000280/LER-1982-092-03, /03L-0:on 820905,at Full Power,Rpi F-8 Observed Fluctuating Up to 15 Steps.Caused by Exposure of Containment Side Electrical Penetration to Excessive Moisture & Faulty Signal.Steam Leak Repaired (← links)
  • 05000280/LER-1982-054-03, /03L-0:on 820905,unattended Portable Pump in Use to Clean Waterbox C Swung Around & Flooded Svc Water Pit Containing Svc Water.Valve MOV-SW-202B Grounded in Open Position.Caused by Operator error.MOV-SW-202B Dried (← links)
  • 05000280/LER-1982-093-03, /03L-0:on 820904,at 100% Power,Air Bank 1 for Emergency Diesel Generator 1 Found W/Insufficient Air Pressure to Start Generator.Caused by Failure to Reset Local Low Air Pressure.Bottles Filled to 200 Psi (← links)
  • 05000280/LER-1982-089-03, /03L-0:on 820826,B Core Cooling Monitor Failed, Causing Spurious Alarms.Caused by Relay Failure on Printed Circuit Cards A-1 & A-2.Boards Repaired & Core Cooling Monitor Returned to Svc (← links)
  • 05000280/LER-1982-085-03, /03L-0:on 820824,RCS post-reactor Trip Specific Activity Samples Found Greater than Tech Spec Limits.Caused by Fuel Defects in Reactor Core.Acclerated Sampling Frequency Implemented Till RCS Activity Less than Tech Spec (← links)
  • 05000280/LER-1982-124-03, /03L-0:on 821214,svc Water Inlet Valve to Recirculation Spray HX,MOV-SW-103C,inadvertently de-energized & Red Tagged.Caused by Personnel Error.Tag Removed & Breaker Closed.Personnel Disciplined (← links)
  • 05000280/LER-1982-123-03, /03L-0:on 821209,radiation Recorder RR-175 Observed to Be Inoperable While Effluent Releases in Progress.Caused by Slippage of Drive Cable Off Pulley.Drive Cable Placed Back on Pulley & Recorder Returned to Svc (← links)
  • 05000280/LER-1978-028-03, /03L-0 on 780916:snubber Not Meeting Inspec Criteria Caused by Low Oil Level Due to Leakage at Mating Surface Between Body & End Plate.Holding Bolts Were Tightened & Snubber Was Refilled (← links)
  • 05000280/LER-1978-028, Forwards LER 78-028/03L-0 (← links)
  • 05000280/LER-1978-004-03, /03X-1 on 780305:loss of Svc Water Flow Through Charging Pump Intermediate Seal Cooler Was Caused by Corrosion of Stem of Discharge Gate Valve;Corrosion Was Galvanic(Brass Touching Bronze);Problem Will Be Studied (← links)
  • 05000280/LER-1981-028-03, /03L-0:on 810711,liquid Waste Tank 1-LW-TK-11B Inadvertently Released W/O Being Sampled.Caused by Discharge Valve Being Partially Opened.Release Terminated & Sample Taken.Activity within Allowable Limits (← links)
  • 05000280/LER-1981-029-03, /03L-0:on 810808,while at 100% Power,Individual Rod Position Indicator for Rod F.12 Indicated Erratically & 12 Steps Less than Bank Demand Position.Caused by Poor Electrical Connection Between Coil & Signal Module (← links)
  • 05000280/LER-1981-022-03, /03L-0:on 810703,low Flow Alarm Observed for Process Vent Sys.Caused by Process Blower Motors Out of Svc Due to Valve 1-CM-21 Leaking Through to Vent Piping During Attempt to Drain Mixed Bed Demineralizer 1A for Resin Fill (← links)
  • 05000280/LER-1981-027-03, /03L-0:on 810726,PT-27 Revealed Low Current Readings for Circuit 30,Panels 8 & 9 (Boron Injection Tank Recirculation Line),Rendering Both Channels of Heat Tracing Inoperable.Caused by Boric Acid build-up on Tracing Tapes (← links)
  • 05000280/LER-1982-091-03, /03L-0:on 820905,water & Sediment Found in Lube Oil of Charging Pump 1-CH-P-1A.Caused by Leak in One Tube of Lube Oil Cooler.Cooler Replaced,Oil Changed & Pump Returned to Svc (← links)
  • 05000280/LER-1982-095-03, /03L-0:on 820911,w/unit at Full Power,Steam Generator C Level Indication LI-1-495 Drifted High.Caused by body-bonnet Leak on Transmitter Ref Leg Root Valve.Repairs Will Be Performed During Next Outage (← links)
  • 05000280/LER-1982-096-03, /03L-0:on 820916,w/unit at 99% power,PT-27C Revealed That Amp Readings for Heat Tracing Panel 9,circuit 19,was Below Acceptance Criteria.Caused by Excessive Heat. Defective Heat Tracing Replaced & Tested (← links)
  • 05000280/LER-1982-086-03, /03L-0:on 820827,radiation Monitor RM-LW-10F Indicated 9.0E4 CPM W/O Annunciation of Alarm.Caused by Defective Push Button & Setpoint Drift.Push Button Replaced & Monitor Recalibr (← links)
  • 05000280/LER-1982-084-01, Venting of a Charging Pump Resulted in Max Instantaneous Release Rate Being Exceeded.Caused by Failure to Change Radiation Monitor Setpoint Alarms to Reflect New Vent Sys Flow Rates (← links)
  • 05000280/LER-1982-083-03, /03L-0:on 820831,performance of PT-27E Revealed That Amp Reading for Heat Tracing Panel 9,circuit 2B,was Below Acceptance Criteria.Caused by Excessive Heat.Heat Tracing Replaced & Tested (← links)
  • 05000280/LER-1980-009-01, Westinghouse LOCA-ECCS Reanalysis Indicated Residual Penalty of 0.007 in Fq Exists from Fuel Rod Burst Model.Caused by Reduction in Clad Heatup Rate Which Shifts Fuel Clad Burst Curve (← links)
  • 05000280/LER-1982-080-03, /03L-0:on 820804,core Cooling Monitor B Began to Show Erratic Indication & Removed from Svc.Caused by Failure of Relay on Printed Circuit Board.Relay Replaced & Monitor Returned to Svc (← links)
  • 05000280/LER-1982-049-03, /03L-0:on 820807,2-SW-P-10B Charging Pump Svc Water Pump Failed to Develop Sufficient Discharge Pressure. Caused by Leaking Pump Strainer.Strainer Replaced & Pump Returned to Svc (← links)
  • 05000280/LER-1982-076-03, /03L-0:on 820803,performance of PT-27A Revealed That Amp Reading for Heat Tracing Panel 1,circuit 23A Was Below Acceptance Criteria Stipulated in Pt.Caused by Excessive Heat.Defective Heat Tracing Replaced & Tested (← links)
  • 05000280/LER-1982-039-03, /03L-0:on 820728,svc Valve Pit for MOV-SW-202A Found Flooded W/Valve Open & Motor Grounded.Caused by Failure of Operations Staff to Turn Over Need to Pump Pit & Insp of Wrong Pit Leading to Grounding of MOV-SW-202A (← links)
  • 05000280/LER-1982-045-03, /03L-0:on 820728,breaker for MOV-SW-202B Svc Water to CC HX Found Open W/Valve in Open Position.Cause Unknown. Breaker Closed & Returned to Svc (← links)
  • 05000280/LER-1982-044-03, /03L-0:on 820720,operators Noted RWST Temp Indicators Reading 44 F & 46 F.Calibr of Channels Revealed 46 F Correct & Above Limit.Caused by One Inoperable Refrigeration Unit (← links)
  • 05000280/LER-1981-006-03, /03L-0:on 810306,alarm Setpoint for Component Cooling Water Radiation Monitor RM-CC-106 Found to Be Greater than Twice Background.Caused by Instrument Drift. Monitor Reset to Proper Setpoint & Returned to Svc (← links)
  • 05000280/LER-1981-005-03, /03L-0:on 810301,radiation Monitor Recorder RR-175 Found Printing Erratically.Caused by Dirty Slidewire Resistor in Circuit That Controls Positioning of Printing Device.Resistor Cleaned & Recorder Returned to Svc (← links)
  • 05000280/LER-1982-033-03, /03L-0:on 820530,w/unit at 96% Power,Charging Pump Svc Water Pump 2-SW-P-10B Failed to Develop Sufficient Discharge Pressure.Caused by Insufficient Npsh.Svc Water to Chillers Throttled (← links)
  • 05000280/LER-1982-064-03, /03L-0:on 820530,w/unit at 100% Power,Charging Pump Svc Water Pump 1-SW-P-10B Failed to Develop Sufficient Discharge Pressure.Caused by Insufficient Npsh.Svc Water to Chillers Throttled (← links)
  • 05000280/LER-1982-030-03, /03L-0:on 820526,during Cold Shutdown,Preparations for Filling Reactor Coolant Loop a Resulted in RCS Boron Dilution.Caused by Temporary Malfunction of Boric Acid Flow Controller.Controller Functioning Properly (← links)
  • 05000280/LER-1982-043-03, /03L-0:on 820713,w/unit at 100% Power,Performance of PT-27 Revealed Ampere Reading for Heat Tracing Panel 10, Circuit 6A Below Acceptance Criteria.Caused by Defective Heat Tracing Due to Excessive Heat.Heat Tracing Replaced (← links)
  • 05000280/LER-1982-082-03, /03L-0:on 820713,post-reactor Trip Specific Activity Samples of RCS Indicated Dose Equivalent I-131 Level Greater than Tech Specs.Caused by Fuel Defects in Reactor Core.Accelerated Sampling Frequency Implemented (← links)
  • 05000280/LER-1981-047-03, Following Reactor Trip & While Returning to Power,Specific Activity of RCS Indicated Dose Equivalent I-131 Level Greater than Tech Spec Limit. Caused by Fuel Element Defect in Reactor Core (← links)
  • 05000280/LER-1982-038-03, /03L-0:on 820703,alarm Check Revealed That Amp Reading for Heat Tracing Panel 9 Circuit 20B Was Below Acceptance Criteria.Caused by Excessive Heat.Defective Heat Tracing Replaced & Tested (← links)
  • 05000280/LER-1982-078-03, /03L-0:on 820701,w/unit at Full Power,B Core Cooling Monitor Displayed Erratic Indications.Caused by Failed Relay on plug-in Module on Circuit Board A-1.Failed Component Replaced.Module Returned to Circuit Board (← links)
  • 05000280/LER-1982-042-03, /03L-0:on 820706,main Steam Line Snubber Found W/ Oil in Reservoir.Caused by Leaking Rod Seal Due to Improper Installation.Spare Snubber Tested & Installed (← links)
  • 05000280/LER-1982-069-03, /03L-0:on 820706,charging Pump a Found Leaking Oil.Water Found in Lube Oil.Caused by Leak in Tube in Charging Pump Lube Oil Cooler.A & B Pump Coolers Interchanged & a Pump Returned to Svc (← links)
  • 05000280/LER-1982-079-03, /03L-0:on 820701,during Periodic Test 6,control Rods from Cabinet 2AC Did Not Respond to Demand Signal. Caused by Faulty Phase Control Card.Card Replaced & Periodic Test Completed (← links)
  • 05000280/LER-1982-077-03, /03L-0:on 820629,during 99% Power,Signal from Loop a Steam Pressure Transmitter PT-1-475 Failed Low.Cause Not Determined.Feedwater Bistables Placed in Trip. Transmitters Replaced & Tested (← links)
  • 05000280/LER-1982-075-03, /03L-0:on 820626,setpoint for CC Rad Monitor RM-CC-105 Discovered Greater than Twice Background.Caused by Decreasing Activity in Computer Cooling Sys.Setpoint Readjusted W/New Background Activity Levels (← links)
  • 05000280/LER-1982-071-03, /03L-0:on 820618,motor Operated valve-1536 Pressure Power Operated Relief Block Valve Was Cycled Open But Failed to Close Fully,Remotely or Manually.Cause Undetermined.Valve Closed Electrically (← links)
  • 05000280/LER-1982-073-03, /03L-0:on 820622,charging Pump Svc Water Pump 1-SW-P-10B Failed to Develop Adequate Discharge Pressure. Caused by Insufficient Npsh.Svc Water to Chillers Throttled to Provide Sufficient NPSH (← links)
  • 05000280/LER-1980-059-01, Util Informed of Potential for Loss of Auxiliary Feedwater Flow Following Steamline Rupture.Caused by Original Design Allowing Pump Runout & Subsequent Tripping of Sys Pump Motors (← links)
  • 05000280/LER-1979-045-01, Air Would Not Flow Through Filters If Consequence Limiting Safeguards hi-hi Signal Removed from Control Circuit of Safeguards Area Exhaust Ventilation Dampers.Caused by Design Deficiency (← links)
  • 05000280/LER-1982-026-03, /03L-0:on 820618,electrical Penetration Found Improperly Sealed.Caused by Personnel Failure to Restore Penetration to Original State Following Cable Installation. Penetration Sealed (← links)
  • 05000280/LER-1982-074-03, /03L-0:on 820618,following Check of Svc Water Piping,Pump 1-SW-P-10B Failed to Auto Start.Caused by Drift of Low Pressure Setpoint of Pressure Switch PS-SW-105.Switch Replaced (← links)
  • 05000280/LER-1982-036-03, /03L-0:on 820611,motor Operated Valve CS-203C Failed to Close During Performance of PT-17.1.Caused by Loose Field Wiring Disconnect Device at Motor Control Ctr Cubicle.Plug Reinserted & Valve Returned to Svc (← links)
  • 05000280/LER-1982-035-03, /03L-0:on 820607,w/unit at Full power,TV-IA-201A Would Not Remain Closed After High Radiation Test Signal Cleared.Caused by Incomplete Valve Contact Due to Loosened Limit Switch Mounting Plate.Plate Secured (← links)
  • 05000280/LER-1982-061-03, /03L-0:on 820606,w/unit at 100% Power,Core Cooling Monitor a Showed Erratic Indication & Was Removed from Svc. Caused by Failed Printed Circuit Board.Board Replaced (← links)
  • 05000280/LER-1982-065-03, /03L-0:on 820609,w/unit at 100% Power,Core Cooling Monitor Channel B Failed,Resulting in Spurious Alarms.Caused by Faulty Thermocouple Input.Input Replaced (← links)
  • 05000280/LER-1982-032-03, /03L-0:on 820531,pressure in Nitrogen Bottle Supplying Emergency Air to PCV-MS-202A & B Found Below Tech Spec Limit.Caused by Fitting Leaks in Air Lines.Fittings Tightened & Pressurized Bottle Installed (← links)
  • 05000280/LER-1982-067-03, /03L-0:on 820524,w/unit at 100% Power,Charging Pump Svc Water pump,1-SW-P-10A,failed to Operate.Caused by Excessive Amount of Trash in Upstream Rotating Strainer. Strainer Blown Down & Discharge Pressure Returned to Svc (← links)
  • 05000280/LER-1982-029-03, /03L-0:on 820518,during Periodic Test 2-PT-39B-2 Snubbers 2-RC-HSS-162 & 163 Found to Have Empty Remote Reservoir.Caused by Damaged O Ring on Common Valve Block. O Ring Replaced (← links)
  • 05000280/LER-1982-062-03, /03L-0:on 820520,PT-27 Revealed Low Ampere Readings for Circuit 7A in Panels 8 & 9,contrary to Tech Spec.Caused by Damaged Tapes.Tapes Replaced (← links)
  • 05000280/LER-1982-059-03, /03L-0:on 820517,during Recorder Pen Check,Pen on FR-GW-100 (Process Vent) Did Not Correspond to Actual Process Vent Flow Per Tech Spec.Caused by Seized Recorder Motor Bearing Due to Lack of Lubrication.Bearing Replaced (← links)
  • 05000280/LER-1982-024-01, /01T-0:on 820524,weld Leak on a Steam Generator Channel Head Drain Piping at 2-RC-159 Identified During RCS Integrity Test PT-11.Caused by Random Defect in Root Weld, Possibly Due to Split Pass (← links)
  • 05000280/LER-1982-027-03, /03L-0:on 820513,performance of PT 27B Revealed Amp Readings for Heat Tracing Panels 8 & 9,circuit 21A,below Acceptance Criteria.Caused by Excessive Heat.Defective Heat Tracing Replaced (← links)
  • 05000280/LER-1982-028-03, /03L-0:on 820513,both Charging Pump Svc Water pumps,2-SW-10A & 10B,lost Suction.Caused by Clogged Suction Line Strainer Due to Marine Growth & Increased Use of Svc Water by Chillers (← links)
  • 05000280/LER-1982-025-03, /03L:on 820509,control Room Operator Overfilled B Accumulator Beyond Upper Tech Spec Limit.Caused by Operator error.HCV-2852B Opened to Drain Accumulator Tank to Tech Spec Limits (← links)
  • 05000280/LER-1982-063-03, /03L:on 820330,circuit Breakers for Heat Tracing Panels 8 & 9,circuits 7,found Inoperable.Caused by Mechanical Failure in One Breaker.Defective Breaker Replaced & Other Circuit Breaker Reset (← links)
  • 05000280/LER-2019-002, Items Non-Conforming to Design for Tornado Missile Protection (← links)
  • 05000280/LER-1982-040-03, /03L-0:on 820325,during Normal Startup,Automatic Start of 1-FW-P-3A Pump Failed to Respond to Safety Injection.Cause Undetermined.Pump Manually Started from Control Room (← links)
  • 05000280/LER-1982-041-03, /03L-0:on 820331,during Liquid Waste Release, Radiation Monitor Recorder RR-100 Failed Low.Caused by Dirt Buildup in Drive Motor Stator.Drive Motor Cleaned & Returned to Svc (← links)
  • 05000280/LER-1982-047-01, /01T-0:on 820418,transfer of Gaseous Waste Between Gas Stripper Surge Tank & Waste Gas Surge Tank Resulted in Lifting of RV-GW-107 & Unplanned Release.Caused by Premature Lifting of RV-GW-107.Relief Valve Cleaned & Reset (← links)
  • 05000280/LER-1982-022, Forwards Updated LER 82-022/03X-1 & LER 82-047/01T-0 (← links)
  • 05000280/LER-1982-052-03, /03L-0:on 820428,amplifier for Heat Tracing Panel B,Circuit 2B,read Below Acceptance Criteria.Caused by Excessive Heat.Defective Heat Tracing Replaced & Tested. Design Change Initiated (← links)
  • 05000280/LER-1982-046-03, /03L-0:on 820419,process Vent Particulate Radiation Monitor Filter Fault Alarm Observed.Filter Paper Unable to Advance Due to Swelling Caused by Water Absorption.Caused by Lifting of Relief Valve RV-GW-107 (← links)
  • 05000280/LER-1982-051-03, /03L-0:on 820425 & 26,post-reactor Specific Samples of RCS Indicated Dose Equivalent I-131 Level Greater than Tech Spec Limit.Caused by Fuel Defects in Reactor Core.Accelerated Sampling Frequency Implemented (← links)
  • 05000280/LER-1982-021-03, /03L-0:on 820415,w/unit Operating at Steady State 96% power,2 Emergency Diesel Generator Found Stuck in Lower Position.Caused by Speed Control Governor Being Physically Stuck in Lower Position (← links)
  • 05000280/LER-1982-031-03, /03L-0:on 820222,RHR Sample Sys Containing Isolation Trip valve,TV-SS-103A,opened W/O Operator Action & Could Not Be Closed from Control Room.Cause Not Yet Identified.Redundant Trip Valve Closed (← links)
  • 05000280/LER-1982-016-03, /03L-0:on 820131,loss of Boric Acid Flow to Blender Observed While Attempting Blend to Vol Control Tank. Caused by Loss of Heat Tracing & Damaged Insulation Upstream of Flow Transmitter.Tracing Replaced (← links)
  • 05000280/LER-1982-017-03, /03L-0:on 820131,PR-27 Revealed Ampere Readings for Heat Tracing Panels 8 & 9,circuits 24A & C Below Acceptance Criteria.Caused by Loss of Heat Tracing Due to Excessive Heat.Tracing Replaced.Design Change Initiated (← links)
  • 05000280/LER-1982-013-03, /03L-0:on 820126,dropped Control Rod Resulted in Quadrant to Average Power Tilt of Greater than 2%.Caused by Corroded Conductors in Power Supply Due to Break in Cable Admitting Moisture.Cable Repaired & Control Rod Realigned (← links)
  • 05000280/LER-1982-019-03, /03L-0:on 820202,PT-27 Revealed Ampere Readings for Heat Tracing Circuits 24C,25A,panel 2 & Circuit 24D, Panels 1 & 2 (Boron Injection Tank Recirculation Line) Below Acceptance Criteria.Caused by Loss of Heat Tracing (← links)
  • 05000280/LER-1982-011-03, /03L-0:on 820126,three Incidents of Unsampled Release from Subsurface Drains to Discharge Canal Occurred. Caused by Operator Error.Administrative Controls Established to Notify Health Physics Prior to Pumping of Drains (← links)
  • 05000280/LER-1982-023-03, /03L-0:on 820212,PT-39B.2 & PT-39B.1 Revealed That Snubbers 1-RC-HSS-131,1-WFPD-HSS-15 & 1-SHP-HSS-35B Were Inoperable Due to Low Oil Reservoir Level.Caused by Seal Leakage.Snubbers Replaced &/Or Repaired (← links)
  • 05000280/LER-1982-006-03, /03L-0:on 820211,w/unit at 100% power,PT-27 Revealed That Amp Readings for Heat Tracing Panel 11,circuit 6A Was Below Acceptance Criteria.Caused by Excessive Heat. Defective Heat Tracing Replaced & Tested (← links)
  • 05000280/LER-1982-022-03, /02L-0:on 820209,relief Valve RV-GW-103 Opened Causing Pressure Transient in Process Vent Sys & Damaging Process Vent Flow Transmitter.Caused by Momentary Pressure Spike That Overranged Flow Transmitter.Transmitter Replaced (← links)
  • 05000280/LER-1982-029-01, /01T-0:on 820222,steam Line Flow Instruments for a Main Steam Line,Channels 3 & 4, & B Main Steam Line,Channel 3,reported Inoperable During Startup.Caused by Lack of Power Supply Fuses to Transmitters.Fuses Replaced (← links)
  • 05000280/LER-1982-029, Forwards LER 82-029/01T-0 (← links)
  • 05000280/LER-1982-020-03, /03L-0:on 820205,w/unit at 100% Power,Loss of Boric Acid Flow to Blender Was Observed.Caused by Operating Mechanism Failure on Valve 1-CH-88.Valve Mechanism Repaired (← links)
  • 05000280/LER-1982-005-03, /03L-0:on 820207,trip Valve TV-SS-204B Was Discovered Open & Would Not Close W/O Operator Intervention. Caused by Misalignment of Actuation Disk.Actuation Disk Adjusted (← links)
  • 05000280/LER-1982-004-03, /03L-0:on 820112,fire Hydrants 1-FP-89,1-FP-63, 1-FP-73 & 1-FP-98 Would Not Open.Caused by Freezing of Stagnant Water in Body of Hydrant Due to Unusually Low Temp. Frequency of Insps to Be Increased During Winter Months (← links)
  • 05000280/LER-1982-001-03, /03L-0:on 820106,spurious Safety Injection Caused Phase 1 Containment Isolation.Trip Valve TV-CC-109B Failed to Close.Caused by Teflon Tape Preventing Operation of 3-way SOV That Controls TV-CC-109B (← links)
  • 05000280/LER-1982-001, Forwards LER 82-001/03L-0 (← links)
  • 05000280/LER-1981-083-03, /03L-0:on 811223,at 100% Power,Sliding Fire Door Between Units 1 & 2 Emergency Switchgear Rooms Found Partially Open & Unattended.Caused by Disconnected Counterweight;Intact Weight Acted to Partially Open Door (← links)
  • 05000280/LER-1981-082-03, /03L-0:on 811231,during Biweekly Control Rod Assembly Partial Movements Test PT-6,rod J-9 Found Inoperable.Caused by Failure of Connector Pin in Lift Coil Wiring to Make Electrical Contact.Pin Pulled Up & Locked (← links)
  • 05000280/LER-1981-081-03, /03L-0:on 811222,both Containment Vacuum Pumps Were Inoperable.Caused by Sliding Vanes in Pump Rotor Binding in Guide Slots.One Pump Replaced & Other Repaired (← links)
  • 05000280/LER-1981-080-03, /03L-0:on 811221,w/unit at 99% power,PT-27 Revealed That Amp Readings for Heat Tracing Panel 8,circuit 13A Were Below Tech Spec Limit.Caused by Excessive Heat. Defective Heat Tracing Tape Replaced (← links)
  • 05000280/LER-1981-080, Forwards LER 81-080/03L-0 (← links)
  • 05000280/LER-1981-079-03, /03L-0:on 811218,only Three Reactor Coolant Samples Taken within 1-wk Period for Chlorine,Fluorine & Oxygen Analysis.Caused by Performance of Type a Testing. Samples Taken Immediately After Type a Testing Completion (← links)
  • 05000280/LER-1981-077-03, /03L-0:on 811204,while Performing Periodic Test 18.6C,MOV-1867A Would Not Cycle When Operated from Control Room.Cause Not Stated (← links)
  • 05000280/LER-1981-076-03, /03L-0:on 811206,w/both Units at Cold Shutdown, Fuel Level in Diesel Fire Pump Fuel Tank Was Found to Be 215 Gallons,Below Tech Spec Limit.Caused by Administrative Oversite.Personnel Reinstructed (← links)
  • 05000280/LER-1981-071-03, /03L-0:on 811216,following Reactor Trip,Specific Activity Samples of RCS Indicated Dose Equivalent I-131 Levels Greater than Tech Spec Limit.Caused by Fuel Element Defect in Reactor Core.Sampling Frequency to Be Increased (← links)
  • 05000280/LER-1981-078-03, /03L-0:on 811206,MOV-LCV-1115E Failed to Respond Properly to Train B Safety Injection Signal.Caused by Improper Wiring Connection Preventing Closing Signal from Reaching Valve.Wiring Corrected (← links)
  • 05000280/LER-1981-075-03, /03L-0:on 811128,sump Containing MOV-SW-102A Found W/High Water Level Resulting in Motor Ground.Cause Not Stated.Valve Closed,Motor Removed,Dried & Replaced (← links)
  • 05000280/LER-1981-074-03, /03L-0:on 811126 & 1201,alarm Setpoints for Component Cooling Radiation Monitors RM-CC-105 & 106 Exceeded Tech Spec Limit.Caused by Fluctuations in Component Cooling Activity.Setpoints Reset (← links)
  • 05000280/LER-1981-079, Forwards LERs 81-070/03L-0,81-074/03L-0,81-078/03L-0 for Unit 2 & LER 81-079/03L-0 for Unit 1 (← links)
  • 05000280/LER-1981-067-03, /03L-0:on 811111,trip Valve TV-CC-109B (Component Cooling Isolation) Failed to Close Remotely from Control Room.Caused by Hole in Diaphragm Due to Normal Wear.Entire Positioner Replaced (← links)
  • 05000280/LER-1981-068-03, /03L-0:on 811102,06 & 13,electrical Penetrations Through Fire Barriers Found Open & Unattended.Caused by Failure of Const Personnel to Restore Fire Barrier or Post Watch After Completion of Cable Installation (← links)
  • 05000280/LER-1981-055-03, Both Charging Pump Svc Water Pumps Failed.Caused by Failure of Carbon Steel Cap Screw on One Pump Allowing Impeller to Bind & Shorting Out of Motor Stator Windings of Second Pump (← links)
  • 05000280/LER-1981-066-03, /03L-0:on 811027,technical Review Found Not Yet Begun on Design Change Package That Relocated Portions of Yard Firemain Piping.Caused by Project Engineer Administrative Error.Documents Updated (← links)
  • 05000280/LER-1981-066, Forwards LER 81-066/03L-0 & Updated LER 81-055/03X-1 (← links)
  • 05000280/LER-1981-061-03, /03L-0:on 811015,clevis Holding Rod Eye of Snubber 1-SHP-HSS-1B on Main Steam Line a Was Making Contact W/ Snubber Body Hindering Full Compression.Caused by Thermal Growth.Clevis Modified to Allow Full Travel of Piston (← links)
  • 05000280/LER-1981-061, Forwards LER 81-061/03L-0.Detailed Event Analysis Encl (← links)
  • 05000280/LER-1981-065-03, /03L-0:on 811020,PT-27 Revealed Amp Readings for Heat Tracing Panel 8,circuit 7B,were Below Acceptance Criteria.Caused by Excessive Heat.Heat Tracing Replaced & Tested (← links)
  • 05000280/LER-1981-064-03, /03L-0:on 811020,PT-27 Revealed Amp Readings for Heat Tracing Panels 8 & 9,circuit 13A Were Below Acceptance Criteria.Caused by Excessive Heat.Heat Tracing Replaced & Tested (← links)
  • 05000280/LER-1981-056-03, /03L-0:on 810928,RHR Pump Was Removed from Svc to Evaluate Small Mechanical Seal Leak.Caused by Normal Wear.Pump Returned to Svc.No Further Action Required (← links)
  • 05000280/LER-1981-059-03, /03L-0:on 811005,w/reactor Coolant at Approx 200 F & Heating up,TV-CC-109A (Component Cooling to RHR) Isolation Valve Would Not Close.Cause Undetermined.Air Line Disconnected & Observed to Blow Clear.Air Line Reconnected (← links)
  • 05000280/LER-1981-052-03, /03L-0:on 810920,during Routine Shutdown to Repair Feedwater Leaks Inside Containment Steam Flow Indicator for Steam Generator C,FI-1494,would Not Indicate Properly.Caused by Moisture in Transmitter.Leaks Repaired (← links)
  • 05000280/LER-1981-048-03, /03L-0:on 810912,while Unit Was Being Returned to Svc Following Rod Control Problem,C Steam Flow Transmitter Ft-1495 Indicated Low.Caused by Water Collecting & Shorting Out Transmitter.Transmitter Replaced (← links)
  • 05000280/LER-1981-043-03, /03L-0:on 810901,review Disclosed That Fire Hydrants Were Not Flow Tested Once Per 3-yrs as Required. Caused by Misinterpretation of Tech Specs.New Periodic Test Written & Submitted to Corporated Fire Protection Ofc (← links)
  • 05000280/LER-1981-042-03, /03L-0:on 810902,high Alarm Setpoint for Component Cooling Radiation Monitor RM-CC-105 Was Exceeded W/O Surge Tank Vent Closing or Annunciator Alarming.Caused by Failed Log Ratemeter Card.Card Replaced & Instrument Recalibr (← links)
  • 05000280/LER-1981-040-03, /03L-0:on 810901,amp Readings for Heat Tracing Panel 1 Circuits 23A & 24D Found Below Acceptance Criteria. Caused by Heat Tape Failure Due to Mechanical Damage.Tape Replaced & Tested (← links)
  • 05000280/LER-1981-036-03, /03L-0:on 810804,during Control & Relay Room Envelope Pressure Testing,Positive Differential Pressure Acceptance Criterion Not Met.Caused by Worn Seals Around Four Doors & Electrical Penetration Not Air Tight (← links)
  • 05000280/LER-1981-032-03, /03L-0:on 810727,heat Tracing Periodic Test Revealed Low Amp Readings on Manual Emergency Borate Line, Panel 8,circuit 4B.Caused by Excessive Heat.Heat Tracing Replaced (← links)
  • 05000280/LER-1981-030-03, /03L-0:on 810721,at 100% Power,Readings for Heat Tracing Panel 9 Circuits 25A & 7A Were Below Acceptance Criteria.Caused by Electrical Malfunction.Defective Heat Tracing Replaced & Tested.Design Change Initiated (← links)
  • 05000280/LER-1983-001-03, /03L-0:on 830112,at 100% Power,Radiation Monitor Recorder RR-100 Failed Low.Caused by Insulating Film Buildup on Monitor Selector Contacts.Contacts Cleaned & Recorder Returned to Svc (← links)
  • 05000280/LER-1983-001, Forwards LER 83-001/03L-0 & Updated LERs 81-054/03X-1 & 81-082/03X-1 (← links)
  • 05000280/LER-1982-101-03, /03L-0:on 821009,snubbers 1-SHP-HSS-35B, 1-SW-MSS-2,1-S1-HSS-100,1-WFPD-HSS-14,WFPD-HSS-15 & 1-RC-HSS-116 Found Inoperable.Caused by Fitting Leaks & Failure to Stroke Due to Corrosion.Snubbers Replaced (← links)
  • 05000280/LER-1982-109-03, /03L-0:on 821017,high Steam Flow Setpoints Determined to Be Greater than Tech Spec Limits.Caused by Error in Original Calculations to Set Voltage Calibr Steam Flow Instrumentation.Correct Voltages Calculated (← links)
  • 05000280/LER-1982-097-32, /03L-0:on 821014,auxiliary Feed Pumps Prevented from Automatically Starting on Loss of Both Normal Feed Pump Motors.Caused by Incomplete Design Change W/Improper Documentation.Jumpers Installed in Control Circuitry (← links)
  • 05000280/LER-1982-097, Forwards LER 82-097/03L-0 (← links)
  • 05000280/LER-1982-106-03, /03L-0:on 821002,during Mode 5,w/overpressure Mitigating Sys in Enable,Both Pressurizer PORVs (PCV 1455C & 1456) Declared Inoperable.Caused by Leaking Diaphragm on PCV 1455C & Low Air Pressure on PCV 1456 Backup Air Supply (← links)
  • 05000280/LER-1982-104-03, /03L-0:on 820929,at Full Power,Performance of PT-24.2A Revealed That High Pressure Cardox Sys for Fuel Oil Pump Houses Inoperable.Caused by Zone Discharge Solenoid Valve Stuck Open Due to Scale & Corrosion Products (← links)
  • 05000280/LER-1982-108-01, /01T-0:on 821016,performance of TOP-100 Disclosed Valves 1-CS-116 & 1-CS-118 Were Closed.Caused by Valves Being Closed During Leak Test/Troubleshooting of MOV-CS 10A & B During Maint.Valves Opened (← links)
  • 05000280/LER-1982-108, Forwards LER 82-108/01T-0 (← links)
  • 05000280/LER-1981-073-03, /03L-0:on 811108,isolation Valve to Recirculation Spray HX a Failed to Close.Cause Undetermined.Valve Operated Normally Later.Limit Switch & Torque Settings Examined & Found Satisfactory (← links)
  • 05000280/LER-1982-050-03, /03L-0:on 820817,charging Pump Svc Water Low Pressure Alarm Sounded.Svc Water Pump 10B Auto Started But Did Not Restore Sys Pressure.Caused by Insufficient Npsh. Svc Water to Chiller Reduced & Pump Vented (← links)
  • 05000280/LER-1982-081-03, /03L-0:on 820823,steam Flow Transmitter FT-1-495 Failed Low.Caused by Faulty Power Supply.Power Supply Replaced.Affected Instrument Channel Checked Satisfactorily & Returned to Svc (← links)
  • 05000280/LER-1982-048-03, /03L-0:on 820813,discovered That Uncollected Leakage of 2-CH-P-1C Was in Excess of Tech Spec Limit.Two Pumps Simultaneously Inoperable,Contrary to Tech Specs.Leak Caused by Loose Flange Bolt.Bolt Lubricated (← links)
  • 05000280/LER-1982-090-01, /01T-0:on 820826,during Sampling of Gas Stripper Surge Tank Gaseous Effluent,High Spike Observed on vent-vent Gaseous Monitor.Caused by Gas Leak Through Damaged Quick Disconnect on Vessel.Disconnects Will Be Replaced (← links)
  • 05000280/LER-1982-090, Forwards LER 82-090/01T-0 (← links)
  • 05000280/LER-1983-025-03, /03L-0:on 830601,control Bank B Rod Position Indicators Found Out of Calibr.Caused by Calibr Error. Indicators Recalibr (← links)
  • 05000280/LER-1981-054-03, /03L-0:on 810923,during Cold Shutdown,Higher than Normal Activity Detected in Storm Drain Sys.Attributed to Leaks from Stripper Feed Steam Heater Caused by Four Tubes Leaking in Heat Exchanger Bundle & Receiver Pumps Failure (← links)
  • 05000280/LER-1981-054, Forwards LER 81-054/03L-0 (← links)
  • 05000280/LER-1981-058-03, /03L-0:on 810906,smoke Detector Sys Battery Would Not Accept Charge.Caused by Removal of Line Fuse by Electrician.Line Fuse Replaced & Sys Returned to Svc (← links)
  • 05000280/LER-1981-057-03, /03L-0:on 810827,circuit Breaker for Motor Operated Valve Found Open.Caused by Accidental Bumping. Breaker Reclosed & Appropriate Valve Indication Ack (← links)
  • 05000280/LER-1981-053-03, /03L-0:on 810816,shaft of Standby Pump 2-SW-P-10B Found to Be Rotating Backwards Due to Failure of Check Valve L-SW-108 to Seat Properly.Caused by Wear Resulting in Excessive Play & Binding in Disc (← links)
  • 05000280/LER-1981-039-03, /03L-0:on 810815,accumulator a Level Dropped Due to Inadvertent Opening of Drain Valve HCV-1852A Instead of Fill Isolation Valve HCV-1851A.Caused by Operator Error. Operator Reinstructed in Proper Procedures (← links)
  • 05000280/LER-1981-041-03, /03L-0:on 810820,PT-27D Revealed That Amp Readings for Heat Tracing Panel 9 Circuit 7A Were Below Acceptance Criteria.Caused by Inadvertent Cutting of Heat Tracing Tape During Cleanup Operations on Boric Acid Flat (← links)
  • 05000280/LER-1981-051-03, /03L-0:on 810804,both Charging Pump Svc Water Pumps 2-SW-P-10A & B Lost Suction & Were Secured W/Unit at 100% Power.Caused by Increased Use of Svc Water by Chillers Causing Loss of Suction Pressure (← links)
  • 05000280/LER-1981-050-03, /03L-0:on 810804,during Routine Walkdown,Oil Discovered Being Slung from Outboard Bearing of Charging Pump A.Caused by Tube Leak in Pump Lube Oil Cooler Which Admitted Water to Lube Oil,Causing Seal Failure (← links)
  • 05000280/LER-1981-037-03, /03L-0:on 810806,charging Pump Svc Water Pumps 1-SW-P-10A & B Found to Have Zero Discharge Pressure Due to Loss of Suction to Pumps.Caused by Increased Use of Svc Water by Chillers During Summer Months.Strainers Cleaned (← links)
  • 05000280/LER-1981-025, Forwards Updated LER 81-025/01X-1 & LERs 81-037/03L-0, 81-050/03L-0 & 81-051/03L-0 (← links)
  • 05000280/LER-1981-049-03, /03L-0:on 810730,review of Test Program Revealed Sensitized Pipe Supplied by Containment Spray Pump 2-CS-P-1A Was Being Flushed for Less than Min Time Required.Caused by Inadvertent Change of Flush Time for Pump Piping (← links)
  • 05000280/LER-1981-034-03, /03L-0:on 810803,unsealed Fire Barrier Penetration Discovered in Wall Between Cable Tray Room & Cable Vault Tunnel.Caused by Const Personnel Failure to Install Fire Barrier or Post Fire Watch After Opening Penetration (← links)
  • 05000280/LER-1981-046-03, /03L-0:on 810710,solenoid Coil Shorted,Causing Control Transformer for Fuel Oil Transfer Pump 1-EE-P-1C to Overheat & Fail.Caused by Random Electrical Fault in SOV Coil.Sov Replaced & Tested Satisfactorily (← links)
  • 05000280/LER-1981-026-03, /03L-0:on 810709,during Startup,Max Allowable Containment Partial Pressure Was Exceeded.Caused by Feedwater Leak Through Failed Flange Gasket for Auxiliary Feedwater Line Flow Limiting Venturi.Gaskets Replaced (← links)
  • 05000280/LER-1981-044-03, /03L-0:on 810705,amp Readings for Heat Tracing Panel 10,circuits 2A & 4A,& Panel 11,circuits 1A & 1B,were Below Tech Specs.Caused by Excessive Heating of Tape. Defective Heat Tracing Replaced & Tested (← links)
  • 05000280/LER-1981-045-03, /03L-0:on 810703,BIT Recirculation Valves Closed. Caused by Isolation of Instrument Air to Auxiliary Bldg to Avert Reactor Trip.Air Line Break Isolated & Auxiliary Bldg Instrument Air Restored,Reopening Valves (← links)
  • 05000280/LER-1981-024-03, /03L-0:on 810701,fire Seal in Penetration Not Restored & Fire Watch Not Maintained Following Installation of New Cables.Caused by Const Personnel Error.Fire Barrier Sealed.Const Personnel Reinstructed (← links)
  • 05000280/LER-1981-018-03, Ler 81-018/03L-0:on 810702,power Operated Relief Valves Lifted to Mitigate Overpressurization Transient.Caused by Unisolated Charging Flow Control Valve.Valve Isolated. RCS Pressure Reduced Below Setpoint (← links)
  • 05000280/LER-1981-017-03, /03L-0:on 810702,discovered That No Fire Watch Had Been Posted for Two Unsealed Fire Barrier Penetrations in Cable Spreading Room Area.Caused by Const Personnel Error. Fire Watch Posted & Seal Installed (← links)
  • 05000280/LER-1981-021-03, /03L-0:on 810704,chemical Addition Tank Found to Contain 86% of Vol Required,Following Level Transmitter Recalibr.Caused by Use of Pure Water Instead of Sodium Hydroxide Solution in Original Calibr Procedure (← links)
  • 05000280/LER-1981-021, Forwards LER 81-021/03L-0.W/o Encl LERs 81-022/03L-0 & 81-028/03L-0 (← links)
  • 05000280/LER-1981-019-01, /01T-0:on 810707,urgent Failure Alarm for Control Rods Occurred,Indicating Rods Were Inoperrable.Caused by Blown Fuse in Power Cabinet.Fuse Replaced (← links)
  • 05000280/LER-1981-036, Corrected LER 81-036/03L-0,changing Sequential Date of LER 81-033/03L-0.On 810528,sample of Emergency Diesel Generator Fuel Oil Storage Tanks Revealed Water in Tank 1-EE-TK-2A (← links)
  • 05000280/LER-1981-035-03, Fuel Oil Transfer Pump 1B Suction Valve 1-EE-14 Found Closed.Caused by Personnel Error.Valve Opened (← links)
  • 05000280/LER-1981-015-03, /03L-0:on 810603,spent Fuel Pit Overflowed Into New Fuel Handling Area & Outside to Storm Drain.Caused by Leaking Diaphragm Valve & Defeated High Level Alarm Annunciator.Valve Repaired (← links)
  • 05000280/LER-1981-015, Forwards LER 81-015/03L-0,updated LER 81-035/03X-1 & Corrected LER 81-036/03L-0 (← links)
  • 05000280/LER-1981-025-01, /01T-0:on 810710,found Recent Analysis of Loss of Main Feedwater w/3 Reactor Coolant Pumps in Operation Requires Min of 500 Gpm of Auxiliary Feedwater Flow,Contrary to Original FSAR Criteria (← links)
  • 05000280/LER-1981-023-01, /01T-0:on 810709,TE-1-422D Delta T Protection Indicated Zero.To Investigate,Technician Returned Delta T Bistables to Normal w/TE-1-422D Still Indicating Zero.Caused by Incorrectly Wired Tc & Th Resistance Temp Detectors (← links)
  • 05000280/LER-1981-038-03, /03L-0:on 810614,one Fuel Oil Flow Path to Emergency Diesel Generator Was Inoperable.Caused by Failed Control Transformer for Fuel Oil Pump EE-P-1C.Transformer, Burned Wiring & One SOV Replaced (← links)
  • 05000280/LER-1981-016-03, /03L-0:on 810615,primary Sys Chloride Concentration Exceeded Tech Specs.Apparently Caused by Personnel Working on Minor Repairs to Closure Stud Hole on Reactor Vessel Flange.All Sources of Makeup Water Checked (← links)
  • 05000280/LER-1981-067-01, /01X-1:on 810225,radiographic Test of Loops B & C Main Steam Piping,Revealed Linear Indications in Welds 36 & 22.Cause of Defects Under Investigation.Repairs Planned (← links)
  • 05000280/LER-1981-063-03, /03L-0:on 811019,charging Pump Svc Water Pump 1-SW-P-10B Found to Have Zero Discharge Pressure Because of Loss of Suction to Pump.Caused by Increased Use of Svc Water by Chillers.Flow to Chillers Throttled (← links)
  • 05000280/LER-1981-062-03, /03L-0:on 811017,radiation Monitor RI-CC-105 Failed to Give Indication.Caused by Broken Wire Located on Detector Probe.Wire Reconnected (← links)
  • 05000280/LER-1981-060-03, /03L-0:on 811013,outlet Valve from Chemical Addition Tank Would Not Cycle Electrically.Caused by Motor Operation Overload Protection Thermalling Open While Attempting to Cycle Valve,Due to Overly Tightened Valve (← links)
  • 05000280/LER-1981-014-03, /03L-0:on 810523,auxiliary Bldg Filter Banks Were Found to Be Less Efficient than Required by Tech Spec.Caused by Formation of Void Areas Due to Settling of Charcoal in Filters.Charcoal Added (← links)
  • 05000280/LER-1981-013-03, /03L-0:on 810527,radiation Monitor Recorder RR-100 Was Found Indicating Decade Lower than Corresponding Monitors.Caused by Dirty Contacts in Circuit Controlling Positioning of Printing Device.Contacts Cleaned (← links)
  • 05000280/LER-1980-006, Forwards Updated LER 80-006/03X-1 (← links)
  • 05000280/LER-1979-011-03, /03X-1 on 790828:process & Ventilation Particulates & Gaseous Monitors Were W/O Power on Two Occasions.Caused by Loose Lug Connection on Power Supply Cable.Loose Connection Repaired & Plants Restored to Svc (← links)
  • 05000280/LER-2019-001, Failure to Align Angle Drive to Pump Results in Inoperable Emergency Service Water Pump (← links)
  • 05000280/LER-1980-007-03, /03L-0:on 800116,during Normal Operation,Heat Tracing Circuit 4 on Line 1-CH-56-152,boric Acid Supply to Blender Failed.Caused by Water Penetration of Heat Tracing Tape.Tape Replaced W/Higher Water Resistant Tape (← links)
  • 05000280/LER-1980-006-03, /03L-0:on 800115,during Routine Surveillance of Liquid Waste Release,Discovered That Unsampled Waste from Tank 5A Was Being Pumped to Tank 5B.Caused by Inadvertent Operation of Transfer Pump.Waste Release Terminated (← links)
  • 05000280/LER-1980-005-03, /03L-0:on 800120,while Conducting PT 27D Heat Tracing Sys,Discovered That Circuit 17A Panel 9 Was Inoperative.Caused by Thermostat Failure.Maint Rept Initiated.Defective Thermostat Replaced (← links)
  • 05000280/LER-1979-025-03, /03L-0:on 790906,during Review of 1978 Reactor Coolant Activity Records,Discovered Excessive Reactor Coolant Activity Occurred & Not Reported.Iodine Spike Caused by Reactor Trip.Specific Sampling Program Initiated (← links)
  • 05000280/LER-1979-025, Forwards LER 79-025/03L-0 (← links)
  • 05000280/LER-2079-011-03, X for Surry Units 1 & 2 Loss of Power with Both Units at Cold Shutdown, Observed Radiation Monitors Without Power (← links)
  • 05000280/LER-2000-001, Containment Isolation Valve Found with Unacceptable Leakage During Maintenance (← links)
  • 05000280/LER-2078-028-03, L-0 for Surry 2 Re Containment Pressure Exceeded Allowable Limit (← links)
  • 05000280/LER-1978-029-03, X-1, LER 78-029-03L-0, & LER 78-031-03L-0 for Surry 2 Re Critical Below Minimum Insertion Limit on D Control Bank (← links)
  • 05000280/LER-2075-006, Re Consequence Limiting Safeguard High-High Train B Would Not Initiate When 3/4 Matrix of Channels 1,2 & 3 Were Tripped (← links)
  • 05000280/LER-2075-009, Re Less than Required 60,000 Gallons of Water in Above Ground Emergency Condensate Storage Tank (← links)
  • 05000280/LER-2075-010, Re Seal Leakage of Service Water Pump 2-SW-P-4B (← links)
  • 05000280/LER-2075-008, Supplementary Information to LER 1975-008-00 for Surry 2 Re Inadequate Implementation of Administrative Controls During Construction & Preoperation of Facility (← links)
  • 05000280/LER-2075-011, Re Inoperable 4 Kv Undervoltage Protection (← links)
  • 05000280/LER-2075-012, Re Sudden Closure of Main Steam Trip Valve in B Steam Line, Causing Closure of a & C Trip Valves & Reactor Trip (← links)
  • 05000280/LER-2075-013, Re One Channel T Protection Was Not Conservative (← links)
  • 05000280/LER-2075-014, Re 11.4% of Boron Concentration by Weight in Boron Injection Tank Sample (← links)
  • 05000280/LER-2075-015, Re Closure of Boron Injection Tank Recirculation Valves TV-2884A, B, C (← links)
  • 05000280/LER-2075-016, Re 60% Power Low Level Alarm on C Boric Acid Tank (← links)
  • 05000280/LER-2075-017, Re Failure Low of Loop C Hot Leg RTD, Causing Protection Signals to Fail Low (← links)
  • 05000280/LER-2075-018, Re Steam Generator Level Transmitter Isolation Valve Body to Bonnet Leak (← links)
  • 05000280/LER-2075-019, Reporting Abnormal Occurrence of 10/15/1975: 15 Minutes Interruption of Recirculation of 2 Boron Injection Tank Due to Failure of D Boric Acid Transfer Pump Motor (← links)
  • 05000280/LER-2075-021, Re 6% Low Reading of T Protection Channel 1 (← links)
  • 05000280/LER-2075-020, Re Power C Generator Pressure Indication-496-Channel IV Failed High (← links)
  • 05000280/LER-2075-022, Re Setpoint Drift in Nonconservative Direction, Contrary to Tech Spec 2.3.A.2 (← links)
  • 05000280/LER-2076-001, Re Inoperability of Units 1 & 2 Containment Gaseous & Particulate Radiation Monitors (← links)
  • 05000280/LER-2076-002, Re Failure to Close of Main Steam Trip Valve, TV-MS-201A (← links)
  • 05000280/LER-2076-003, Re Non-Operable Condenser Outlet Valve (← links)
  • 05000280/LER-2076-004, Re Failure of Valve in Suction Line to Close (← links)
  • 05000280/LER-2076-006, Re Out of Specification High Level Trip Setpoints of Two of Three Pressurizer Level Transmitters (← links)
  • 05000280/LER-2076-005, Re Greater Overall Integrated Containment Leakage Rate (← links)
  • 05000280/LER-2076-007, Re Refueling Water Chemical Addition Valve MOV-CS-202B (← links)
  • 05000280/LER-2076-009, Re Non-Operable MOV-2862B When Cycled by Console Control Switch (← links)
  • 05000280/LER-2076-008, Re Electronically Non-Operable Condenser Outlet Valve MOV-CW-200B (← links)
  • 05000280/LER-2076-011, Re Deviation of Nuclear Instrumentation System Power Range Channel N42 (← links)
  • 05000280/LER-2076-010, Re Loss of Detector Voltage Alarm on Power Range Nuclear Instrument Channel 42 (← links)
  • 05000280/LER-2076-012, Re Routine Sample of C Safety Injection Accumulator Indication of 1893 Ppm Boron (← links)
  • 05000280/LER-2076-013, Safety Injection Accumulator B Revealed Outside Isolations Valve in Accumulator Test Line Open (← links)
  • 05000280/LER-2076-014, Re Surry Unit 2 Steam Generator B Narrow Range Level Protection Channel II (← links)
  • 05000280/LER-2076-015, Re Leakage of Water from a Recirculation Spray Heat Exchange Piping (← links)
  • 05000280/LER-2076-016, Re Low Boron Concentration of 11.4% by Weight in Boron Injection Tank (← links)
  • 05000280/LER-2077-001, Re Cease of Recirculation Flow from B Boric Acid Tank (← links)
  • 05000280/LER-2077-002, Reportable Occurrence Relating to Boric Acid Transfer Pump (← links)
  • 05000280/LER-2077-005, Failure of Reactor Coolant Flow Comparator to Trip (← links)
  • 05000280/LER-2077-006, No Flow of Boric Acid from the Boric Acid Transfer Pumps to the Charging Pumps (← links)
  • 05000280/LER-2077-007, Low Boron Injection Tank and C Boric Acid Storage Tank Concentration (← links)
  • 05000280/LER-2077-008, Deficiency of Chemical Analysis Procedure to Determine Percent by Weight of Sodium Hydroxide in Chemical Addition Tank to RWST (← links)
  • 05000280/LER-2077-009, Test of Main Steam Safety Valve Setpoint (← links)
  • 05000280/LER-2077-010, Failure of Trip Valves to Indicated Closed on Control Room Panel, During Performance of Safety Injection System Functional Testing (← links)