NRC Form 304
type: Ontology
creation date: 2025-12-17T16:49:02-05:00
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NRC Form 304
type: Subject
page: https://kanterella.com/NRC_Form_304
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wiki page content language: en
wiki page sort key: NRC Form 304

ML20093N490
type: Subject
page: https://kanterella.com/ML20093N490
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: ML20093N490

ML20210L807
type: Subject
page: https://kanterella.com/ML20210L807
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: ML20210L807

LER-1989-012, :on 890107,6,900-volt Tie Breaker Tripped After Reactor Coolant Pump 1C Started,Causing Blackout & Loss of Power to RHR Pump,Fuel Cooling Pump & Component Cooling Pump.Caused by Error in Relay Installation
type: Subject
label: 05000413/LER-1989-012, :on 890107,6,900-volt Tie Breaker Tripped After Reactor Coolant Pump 1C Started,Causing Blackout & Loss of Power to RHR Pump,Fuel Cooling Pump & Component Cooling Pump.Caused by Error in Relay Installation
page: https://kanterella.com/05000413/LER-2D1989-2D012-2C_-3Aon_890107-2C6-2C900-2Dvolt_Tie_Breaker_Tripped_After_Reactor_Coolant_Pump_1C_Started-2CCausing_Blackout_-26_Loss_of_Power_to_RHR_Pump-2CFuel_Cool…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000413/LER-1989-012, :on 890107,6,900-volt Tie Breaker Tripped After Reactor Coolant Pump 1C Started,Causing Blackout & Loss of Power to RHR Pump,Fuel Cooling Pump & Component Cooling Pump.Caused by Error in Relay Installation

LER-1989-005, :on 890530,unit Experienced Reactor Trip from 100- Power Due to Loss of Condenser Vacuum.Caused by Failed Splice in One Phase of 13.8 Kv Feeder Cable.Faulty Load Cable Isolated & Unit Restarted
type: Subject
label: 05000346/LER-1989-005, :on 890530,unit Experienced Reactor Trip from 100% Power Due to Loss of Condenser Vacuum.Caused by Failed Splice in One Phase of 13.8 Kv Feeder Cable.Faulty Load Cable Isolated & Unit Restarted
page: https://kanterella.com/05000346/LER-2D1989-2D005-2C_-3Aon_890530-2Cunit_Experienced_Reactor_Trip_from_100-_Power_Due_to_Loss_of_Condenser_Vacuum.Caused_by_Failed_Splice_in_One_Phase_of_13.8_Kv_Feeder_…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000346/LER-1989-005, :on 890530,unit Experienced Reactor Trip from 100% Power Due to Loss of Condenser Vacuum.Caused by Failed Splice in One Phase of 13.8 Kv Feeder Cable.Faulty Load Cable Isolated & Unit Restarted

05000348/LER-1987-023, :on 871127,control Room Fire Dampers Inoperable Due to Failure to Close W/Air Flow.Caused by Design Deficiency.Implementation of Design Changes Expected within Next 6 Months
type: Subject
page: https://kanterella.com/05000348/LER-2D1987-2D023-2C_-3Aon_871127-2Ccontrol_Room_Fire_Dampers_Inoperable_Due_to_Failure_to_Close_W/Air_Flow.Caused_by_Design_Deficiency.Implementation_of_Design_Changes_…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000348/LER-1987-023, :on 871127,control Room Fire Dampers Inoperable Due to Failure to Close W/Air Flow.Caused by Design Deficiency.Implementation of Design Changes Expected within Next 6 Months

LER-1987-050, :on 871014,containment Isolation Valve Failed During Local Leak Rate Test.Apparent Cause of Valve Sticking Open Not Determined.Event Considered Isolated & No Other Corrective Action Planned
type: Subject
label: 05000482/LER-1987-050, :on 871014,containment Isolation Valve Failed During Local Leak Rate Test.Apparent Cause of Valve Sticking Open Not Determined.Event Considered Isolated & No Other Corrective Action Planned
page: https://kanterella.com/05000482/LER-2D1987-2D050-2C_-3Aon_871014-2Ccontainment_Isolation_Valve_Failed_During_Local_Leak_Rate_Test.Apparent_Cause_of_Valve_Sticking_Open_Not_Determined.Event_Considered_…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000482/LER-1987-050, :on 871014,containment Isolation Valve Failed During Local Leak Rate Test.Apparent Cause of Valve Sticking Open Not Determined.Event Considered Isolated & No Other Corrective Action Planned

LER-1986-006-01, :on 861010,reactor Tripped Due to Loss of Load Trip as Result of Turbine Trip from Partial Loss of Condenser Vacuum.Caused by Operator Error.Operating Shift Will Be Briefed on Test Procedure
type: Subject
label: 05000317/LER-1986-006-01, :on 861010,reactor Tripped Due to Loss of Load Trip as Result of Turbine Trip from Partial Loss of Condenser Vacuum.Caused by Operator Error.Operating Shift Will Be Briefed on Test Procedure
page: https://kanterella.com/05000317/LER-2D1986-2D006-2D01-2C_-3Aon_861010-2Creactor_Tripped_Due_to_Loss_of_Load_Trip_as_Result_of_Turbine_Trip_from_Partial_Loss_of_Condenser_Vacuum.Caused_by_Operator_Erro…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000317/LER-1986-006-01, :on 861010,reactor Tripped Due to Loss of Load Trip as Result of Turbine Trip from Partial Loss of Condenser Vacuum.Caused by Operator Error.Operating Shift Will Be Briefed on Test Procedure

LER-1986-052, :on 860905,discovered Reactor Protection Sys Channel B Reactor Coolant Low Flow Trip Setpoint Set Nonconservatively.Caused by Personnel Error.Disciplinary Action Taken & Procedures Changed
type: Subject
label: 05000528/LER-1986-052, :on 860905,discovered Reactor Protection Sys Channel B Reactor Coolant Low Flow Trip Setpoint Set Nonconservatively.Caused by Personnel Error.Disciplinary Action Taken & Procedures Changed
page: https://kanterella.com/05000528/LER-2D1986-2D052-2C_-3Aon_860905-2Cdiscovered_Reactor_Protection_Sys_Channel_B_Reactor_Coolant_Low_Flow_Trip_Setpoint_Set_Nonconservatively.Caused_by_Personnel_Error.Di…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000528/LER-1986-052, :on 860905,discovered Reactor Protection Sys Channel B Reactor Coolant Low Flow Trip Setpoint Set Nonconservatively.Caused by Personnel Error.Disciplinary Action Taken & Procedures Changed

LER-1986-009-02, :on 860929,automatic Actuation of ESF Sys Occurred.Caused by Personnel Error.On 861010,automatic Actuation of ESF Sys Occurred,Resulting in Containment Purge Isolation Signal.Caused by Noise Spike
type: Subject
label: 05000336/LER-1986-009-02, :on 860929,automatic Actuation of ESF Sys Occurred.Caused by Personnel Error.On 861010,automatic Actuation of ESF Sys Occurred,Resulting in Containment Purge Isolation Signal.Caused by Noise Spike
page: https://kanterella.com/05000336/LER-2D1986-2D009-2D02-2C_-3Aon_860929-2Cautomatic_Actuation_of_ESF_Sys_Occurred.Caused_by_Personnel_Error.On_861010-2Cautomatic_Actuation_of_ESF_Sys_Occurred-2CResultin…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000336/LER-1986-009-02, :on 860929,automatic Actuation of ESF Sys Occurred.Caused by Personnel Error.On 861010,automatic Actuation of ESF Sys Occurred,Resulting in Containment Purge Isolation Signal.Caused by Noise Spike

LER-1986-014-01, :on 861003,crack Detected & Sized in Reactor Water Cleanup Sys Piping.Caused by Intergranular Stress Corrosion of Sensitized Type 304 Stainless Steel.Weld Will Be Repaired & Further Insp to Be Conducted
type: Subject
label: 05000260/LER-1986-014-01, :on 861003,crack Detected & Sized in Reactor Water Cleanup Sys Piping.Caused by Intergranular Stress Corrosion of Sensitized Type 304 Stainless Steel.Weld Will Be Repaired & Further Insp to Be Conducted
page: https://kanterella.com/05000260/LER-2D1986-2D014-2D01-2C_-3Aon_861003-2Ccrack_Detected_-26_Sized_in_Reactor_Water_Cleanup_Sys_Piping.Caused_by_Intergranular_Stress_Corrosion_of_Sensitized_Type_304_Sta…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000260/LER-1986-014-01, :on 861003,crack Detected & Sized in Reactor Water Cleanup Sys Piping.Caused by Intergranular Stress Corrosion of Sensitized Type 304 Stainless Steel.Weld Will Be Repaired & Further Insp to Be Conducted

LER-1987-019, :on 870411,temp of Turbine Driven Auxiliary Feedwater Pump Area ES-07 Exceeded 110 F Limit Set by Tech Specs 3.714b & 6.9.2.Cause Not Stated.Equipment Not Affected According to Maint & Inservice Insp
type: Subject
label: 05000423/LER-1987-019, :on 870411,temp of Turbine Driven Auxiliary Feedwater Pump Area ES-07 Exceeded 110 F Limit Set by Tech Specs 3.714b & 6.9.2.Cause Not Stated.Equipment Not Affected According to Maint & Inservice Insp
page: https://kanterella.com/05000423/LER-2D1987-2D019-2C_-3Aon_870411-2Ctemp_of_Turbine_Driven_Auxiliary_Feedwater_Pump_Area_ES-2D07_Exceeded_110_F_Limit_Set_by_Tech_Specs_3.714b_-26_6.9.2.Cause_Not_Stated…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000423/LER-1987-019, :on 870411,temp of Turbine Driven Auxiliary Feedwater Pump Area ES-07 Exceeded 110 F Limit Set by Tech Specs 3.714b & 6.9.2.Cause Not Stated.Equipment Not Affected According to Maint & Inservice Insp

05000296/LER-1986-008-03, :on 860905,LPCI Motor Generator Set Tripped from Shorted Generator Coil,Reducing RHR Capability.Damaged Generator Removed & Sent to Mfg for Repairs
type: Subject
page: https://kanterella.com/05000296/LER-2D1986-2D008-2D03-2C_-3Aon_860905-2CLPCI_Motor_Generator_Set_Tripped_from_Shorted_Generator_Coil-2CReducing_RHR_Capability.Damaged_Generator_Removed_-26_Sent_to_Mfg…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000296/LER-1986-008-03, :on 860905,LPCI Motor Generator Set Tripped from Shorted Generator Coil,Reducing RHR Capability.Damaged Generator Removed & Sent to Mfg for Repairs

05000298/LER-1986-016, :on 860813,reactor Scram Occurred.Caused by Lack of Proper Preplanning for Relay Replacement & Specific Procedural Guidance.Need for Preplanning of Maint Activities Reemphasized
type: Subject
page: https://kanterella.com/05000298/LER-2D1986-2D016-2C_-3Aon_860813-2Creactor_Scram_Occurred.Caused_by_Lack_of_Proper_Preplanning_for_Relay_Replacement_-26_Specific_Procedural_Guidance.Need_for_Preplanni…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000298/LER-1986-016, :on 860813,reactor Scram Occurred.Caused by Lack of Proper Preplanning for Relay Replacement & Specific Procedural Guidance.Need for Preplanning of Maint Activities Reemphasized

LER-1986-026, :on 860703,results of Maint & Testing Identified Tubing in Atmospheric Vent Valves Too Restrictive to Achieve Required Closing Time.Tubing Between Air Cylinder & Vol Tank Redesigned
type: Subject
label: 05000346/LER-1986-026, :on 860703,results of Maint & Testing Identified Tubing in Atmospheric Vent Valves Too Restrictive to Achieve Required Closing Time.Tubing Between Air Cylinder & Vol Tank Redesigned
page: https://kanterella.com/05000346/LER-2D1986-2D026-2C_-3Aon_860703-2Cresults_of_Maint_-26_Testing_Identified_Tubing_in_Atmospheric_Vent_Valves_Too_Restrictive_to_Achieve_Required_Closing_Time.Tubing_Bet…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000346/LER-1986-026, :on 860703,results of Maint & Testing Identified Tubing in Atmospheric Vent Valves Too Restrictive to Achieve Required Closing Time.Tubing Between Air Cylinder & Vol Tank Redesigned

LER-1986-019-02, :on 860729,determined That Gas Grab Samples Not Taken & Analyzed within Required Time Limits Between 860721 & 860728.Caused by Personnel Miscommunication.Concurrent sign-offs Will Be Used
type: Subject
label: 05000529/LER-1986-019-02, :on 860729,determined That Gas Grab Samples Not Taken & Analyzed within Required Time Limits Between 860721 & 860728.Caused by Personnel Miscommunication.Concurrent sign-offs Will Be Used
page: https://kanterella.com/05000529/LER-2D1986-2D019-2D02-2C_-3Aon_860729-2Cdetermined_That_Gas_Grab_Samples_Not_Taken_-26_Analyzed_within_Required_Time_Limits_Between_860721_-26_860728.Caused_by_Personne…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000529/LER-1986-019-02, :on 860729,determined That Gas Grab Samples Not Taken & Analyzed within Required Time Limits Between 860721 & 860728.Caused by Personnel Miscommunication.Concurrent sign-offs Will Be Used

2 in Logic Channels A2,A4,B2 & B4 of Turbine Bldg Area High Temp Instruments Not Functionally Tested.Cause Undetermined.Periodic Test Revised to Provide for Functional Testing
type: Subject
label: 05000325/LER-1986-032, :on 861218,test Relay TR/2 in Logic Channels A2,A4,B2 & B4 of Turbine Bldg Area High Temp Instruments Not Functionally Tested.Cause Undetermined.Periodic Test Revised to Provide for Functional Testing
page: https://kanterella.com/05000325/LER-2D1986-2D032-2C_-3Aon_861218-2Ctest_Relay_TR/2_in_Logic_Channels_A2-2CA4-2CB2_-26_B4_of_Turbine_Bldg_Area_High_Temp_Instruments_Not_Functionally_Tested.Cause_Undete…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000325/LER-1986-032, :on 861218,test Relay TR/2 in Logic Channels A2,A4,B2 & B4 of Turbine Bldg Area High Temp Instruments Not Functionally Tested.Cause Undetermined.Periodic Test Revised to Provide for Functional Testing

Tech Specs
type: Subject
label: 05000315/LER-1986-002, :on 860217,discovered That Three Reactor Trip Sys Interlock Setpoints Not Set Per Tech Spec Requirements. Caused by Misinterpretation of Tech Specs.Procedures Revised to Agree W/Tech Specs
page: https://kanterella.com/05000315/LER-2D1986-2D002-2C_-3Aon_860217-2Cdiscovered_That_Three_Reactor_Trip_Sys_Interlock_Setpoints_Not_Set_Per_Tech_Spec_Requirements._Caused_by_Misinterpretation_of_Tech_Sp…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000315/LER-1986-002, :on 860217,discovered That Three Reactor Trip Sys Interlock Setpoints Not Set Per Tech Spec Requirements. Caused by Misinterpretation of Tech Specs.Procedures Revised to Agree W/Tech Specs

05000338/LER-1987-001-01, :on 870127,7-day Period Allowed for Fire Pump to Be Out of Svc Exceeded.Caused by Inclement Weather & Further Repair Efforts.Pump Returned to Svc on 870213.W/
type: Subject
page: https://kanterella.com/05000338/LER-2D1987-2D001-2D01-2C_-3Aon_870127-2C7-2Dday_Period_Allowed_for_Fire_Pump_to_Be_Out_of_Svc_Exceeded.Caused_by_Inclement_Weather_-26_Further_Repair_Efforts.Pump_Retur…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000338/LER-1987-001-01, :on 870127,7-day Period Allowed for Fire Pump to Be Out of Svc Exceeded.Caused by Inclement Weather & Further Repair Efforts.Pump Returned to Svc on 870213.W/

LER-1986-009, :on 860224,control Room Ventilation Isolation Signal Initiated Due to Loss of Sample Flow in Intake Radiation Monitors GK-RE-04 & GK-RE-05.Cause Unknown. Evaluation Continuing.Monitors Returned to Svc
type: Subject
label: 05000482/LER-1986-009, :on 860224,control Room Ventilation Isolation Signal Initiated Due to Loss of Sample Flow in Intake Radiation Monitors GK-RE-04 & GK-RE-05.Cause Unknown. Evaluation Continuing.Monitors Returned to Svc
page: https://kanterella.com/05000482/LER-2D1986-2D009-2C_-3Aon_860224-2Ccontrol_Room_Ventilation_Isolation_Signal_Initiated_Due_to_Loss_of_Sample_Flow_in_Intake_Radiation_Monitors_GK-2DRE-2D04_-26_GK-2DRE-…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000482/LER-1986-009, :on 860224,control Room Ventilation Isolation Signal Initiated Due to Loss of Sample Flow in Intake Radiation Monitors GK-RE-04 & GK-RE-05.Cause Unknown. Evaluation Continuing.Monitors Returned to Svc

LER-1986-032-01, :on 861230,two of Four Condenser Low Vacuum Pressure Switches Failed to Meet Tech Spec Setpoint Requirements During Routine Surveillance.Caused by Downward Mechanical Setpoint Drift.Switches Reset
type: Subject
label: 05000245/LER-1986-032-01, :on 861230,two of Four Condenser Low Vacuum Pressure Switches Failed to Meet Tech Spec Setpoint Requirements During Routine Surveillance.Caused by Downward Mechanical Setpoint Drift.Switches Reset
page: https://kanterella.com/05000245/LER-2D1986-2D032-2D01-2C_-3Aon_861230-2Ctwo_of_Four_Condenser_Low_Vacuum_Pressure_Switches_Failed_to_Meet_Tech_Spec_Setpoint_Requirements_During_Routine_Surveillance.Ca…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000245/LER-1986-032-01, :on 861230,two of Four Condenser Low Vacuum Pressure Switches Failed to Meet Tech Spec Setpoint Requirements During Routine Surveillance.Caused by Downward Mechanical Setpoint Drift.Switches Reset

Personnel
type: Subject
label: 05000298/LER-1987-009, :on 870218,reactor Scram Occurred Accompanied by Groups Ii,Iii & VI Isolations When Operating Reactor Feed Pump Mistakenly Tripped by Station Operator.Caused by Personnel Error.Error Reviewed W/Personnel
page: https://kanterella.com/05000298/LER-2D1987-2D009-2C_-3Aon_870218-2Creactor_Scram_Occurred_Accompanied_by_Groups_Ii-2CIii_-26_VI_Isolations_When_Operating_Reactor_Feed_Pump_Mistakenly_Tripped_by_Statio…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000298/LER-1987-009, :on 870218,reactor Scram Occurred Accompanied by Groups Ii,Iii & VI Isolations When Operating Reactor Feed Pump Mistakenly Tripped by Station Operator.Caused by Personnel Error.Error Reviewed W/Personnel

LER-1986-020-01, :on 860619,auto Start of Two Emergency Equipment Cooling Water Pumps Occurred.Caused by out-of- Calibr Raw Cooling Water Sys Pressure Switch.Monthly Calibrs Will Be Performed Until New Switch Installed
type: Subject
label: 05000259/LER-1986-020-01, :on 860619,auto Start of Two Emergency Equipment Cooling Water Pumps Occurred.Caused by out-of- Calibr Raw Cooling Water Sys Pressure Switch.Monthly Calibrs Will Be Performed Until New Switch Installed
page: https://kanterella.com/05000259/LER-2D1986-2D020-2D01-2C_-3Aon_860619-2Cauto_Start_of_Two_Emergency_Equipment_Cooling_Water_Pumps_Occurred.Caused_by_out-2Dof-2D_Calibr_Raw_Cooling_Water_Sys_Pressure_S…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000259/LER-1986-020-01, :on 860619,auto Start of Two Emergency Equipment Cooling Water Pumps Occurred.Caused by out-of- Calibr Raw Cooling Water Sys Pressure Switch.Monthly Calibrs Will Be Performed Until New Switch Installed

05000400/LER-1986-007-04, :on 861204,fire Hose Station Taken Out of Svc W/O Appropriate Compensatory Action.Caused by Personnel Error.Backup Suppression Established Immediately Following Discovery
type: Subject
page: https://kanterella.com/05000400/LER-2D1986-2D007-2D04-2C_-3Aon_861204-2Cfire_Hose_Station_Taken_Out_of_Svc_W/O_Appropriate_Compensatory_Action.Caused_by_Personnel_Error.Backup_Suppression_Established_…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000400/LER-1986-007-04, :on 861204,fire Hose Station Taken Out of Svc W/O Appropriate Compensatory Action.Caused by Personnel Error.Backup Suppression Established Immediately Following Discovery

LER-1986-027-01, :on 861130,reactor Scrammed Due to Main Transformer Fault,Resulting in Actuation of Generator Ground Relay & Causing Initiation of Turbine Trip Logic.Caused by Break in Winding Insulation
type: Subject
label: 05000245/LER-1986-027-01, :on 861130,reactor Scrammed Due to Main Transformer Fault,Resulting in Actuation of Generator Ground Relay & Causing Initiation of Turbine Trip Logic.Caused by Break in Winding Insulation
page: https://kanterella.com/05000245/LER-2D1986-2D027-2D01-2C_-3Aon_861130-2Creactor_Scrammed_Due_to_Main_Transformer_Fault-2CResulting_in_Actuation_of_Generator_Ground_Relay_-26_Causing_Initiation_of_Turb…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000245/LER-1986-027-01, :on 861130,reactor Scrammed Due to Main Transformer Fault,Resulting in Actuation of Generator Ground Relay & Causing Initiation of Turbine Trip Logic.Caused by Break in Winding Insulation

05000482/LER-1986-033, :on 860612,verification of Fuel Oil Properties Not Performed within 30 Days of Obtaining Fuel Oil Samples. Sys for Processing Lab Repts Improved
type: Subject
page: https://kanterella.com/05000482/LER-2D1986-2D033-2C_-3Aon_860612-2Cverification_of_Fuel_Oil_Properties_Not_Performed_within_30_Days_of_Obtaining_Fuel_Oil_Samples._Sys_for_Processing_Lab_Repts_Improved
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000482/LER-1986-033, :on 860612,verification of Fuel Oil Properties Not Performed within 30 Days of Obtaining Fuel Oil Samples. Sys for Processing Lab Repts Improved

LER-1986-023-01, :on 860717,during Attempt to Put Switchyard Capacitor Bank in Svc,Reactor Scram Occurred.Caused by Incomplete Closing of Switchyard Disconnect & Mechanical Failure.Retraining Course Developed
type: Subject
label: 05000259/LER-1986-023-01, :on 860717,during Attempt to Put Switchyard Capacitor Bank in Svc,Reactor Scram Occurred.Caused by Incomplete Closing of Switchyard Disconnect & Mechanical Failure.Retraining Course Developed
page: https://kanterella.com/05000259/LER-2D1986-2D023-2D01-2C_-3Aon_860717-2Cduring_Attempt_to_Put_Switchyard_Capacitor_Bank_in_Svc-2CReactor_Scram_Occurred.Caused_by_Incomplete_Closing_of_Switchyard_Disco…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000259/LER-1986-023-01, :on 860717,during Attempt to Put Switchyard Capacitor Bank in Svc,Reactor Scram Occurred.Caused by Incomplete Closing of Switchyard Disconnect & Mechanical Failure.Retraining Course Developed

LER-1986-020, :on 860508,automatic Reactor & Turbine Trip Occurred During Turbine Vibration Tests.Caused by Operator Accelerating Turbine at Too High Rate.Shift Supervisor & Operators Counseled
type: Subject
label: 05000213/LER-1986-020, :on 860508,automatic Reactor & Turbine Trip Occurred During Turbine Vibration Tests.Caused by Operator Accelerating Turbine at Too High Rate.Shift Supervisor & Operators Counseled
page: https://kanterella.com/05000213/LER-2D1986-2D020-2C_-3Aon_860508-2Cautomatic_Reactor_-26_Turbine_Trip_Occurred_During_Turbine_Vibration_Tests.Caused_by_Operator_Accelerating_Turbine_at_Too_High_Rate.S…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000213/LER-1986-020, :on 860508,automatic Reactor & Turbine Trip Occurred During Turbine Vibration Tests.Caused by Operator Accelerating Turbine at Too High Rate.Shift Supervisor & Operators Counseled

2, Correcting Deficiency,Approved
type: Subject
label: 05000400/LER-1987-009, :on 870224 & 25,containment Leak Detection Radiation Monitor Noble Gas Channel Declared Inoperable. Caused by Procedural Deficiency.Advance Change 1/2, Correcting Deficiency,Approved
page: https://kanterella.com/05000400/LER-2D1987-2D009-2C_-3Aon_870224_-26_25-2Ccontainment_Leak_Detection_Radiation_Monitor_Noble_Gas_Channel_Declared_Inoperable._Caused_by_Procedural_Deficiency.Advance_Ch…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000400/LER-1987-009, :on 870224 & 25,containment Leak Detection Radiation Monitor Noble Gas Channel Declared Inoperable. Caused by Procedural Deficiency.Advance Change 1/2, Correcting Deficiency,Approved

LER-1987-003-02, :on 870220,unplanned ESF Actuation Occurred During Transfer of 4 Kv Shutdown Board C to Alternate Power Supply.Caused by Circuit Protector Opening.Operating Procedure for Board Transfers to Be Revised
type: Subject
label: 05000259/LER-1987-003-02, :on 870220,unplanned ESF Actuation Occurred During Transfer of 4 Kv Shutdown Board C to Alternate Power Supply.Caused by Circuit Protector Opening.Operating Procedure for Board Transfers to Be Revised
page: https://kanterella.com/05000259/LER-2D1987-2D003-2D02-2C_-3Aon_870220-2Cunplanned_ESF_Actuation_Occurred_During_Transfer_of_4_Kv_Shutdown_Board_C_to_Alternate_Power_Supply.Caused_by_Circuit_Protector_…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000259/LER-1987-003-02, :on 870220,unplanned ESF Actuation Occurred During Transfer of 4 Kv Shutdown Board C to Alternate Power Supply.Caused by Circuit Protector Opening.Operating Procedure for Board Transfers to Be Revised

LER-1986-003, :on 860326,during Monthly Test for Diesel Generator,Area Smoke Detector Alarmed,But No Fire Alarm Received in Control Room.Caused by Two Inoperable Detectors. Test Procedure Revised
type: Subject
label: 05000334/LER-1986-003, :on 860326,during Monthly Test for Diesel Generator,Area Smoke Detector Alarmed,But No Fire Alarm Received in Control Room.Caused by Two Inoperable Detectors. Test Procedure Revised
page: https://kanterella.com/05000334/LER-2D1986-2D003-2C_-3Aon_860326-2Cduring_Monthly_Test_for_Diesel_Generator-2CArea_Smoke_Detector_Alarmed-2CBut_No_Fire_Alarm_Received_in_Control_Room.Caused_by_Two_Ino…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000334/LER-1986-003, :on 860326,during Monthly Test for Diesel Generator,Area Smoke Detector Alarmed,But No Fire Alarm Received in Control Room.Caused by Two Inoperable Detectors. Test Procedure Revised

LER-1986-014, :on 860404,discovered That ESF Ventilation Sys HV-AES-1 Air Flow Rate Greater than Tech Spec Limit.Caused by Surveillance Procedure Deficiency.Procedure Will Be Revised to Include Addl Data
type: Subject
label: 05000316/LER-1986-014, :on 860404,discovered That ESF Ventilation Sys HV-AES-1 Air Flow Rate Greater than Tech Spec Limit.Caused by Surveillance Procedure Deficiency.Procedure Will Be Revised to Include Addl Data
page: https://kanterella.com/05000316/LER-2D1986-2D014-2C_-3Aon_860404-2Cdiscovered_That_ESF_Ventilation_Sys_HV-2DAES-2D1_Air_Flow_Rate_Greater_than_Tech_Spec_Limit.Caused_by_Surveillance_Procedure_Deficien…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000316/LER-1986-014, :on 860404,discovered That ESF Ventilation Sys HV-AES-1 Air Flow Rate Greater than Tech Spec Limit.Caused by Surveillance Procedure Deficiency.Procedure Will Be Revised to Include Addl Data

LER-1986-048, :on 860717,safety Injection Tanks (SIT) Inoperable Due to Wide Range Level Exceeding High Level Limit.Caused by Personnel Error.Order Stating Importance of SIT Level Monitoring During Heatup Issued
type: Subject
label: 05000529/LER-1986-048, :on 860717,safety Injection Tanks (SIT) Inoperable Due to Wide Range Level Exceeding High Level Limit.Caused by Personnel Error.Order Stating Importance of SIT Level Monitoring During Heatup Issued
page: https://kanterella.com/05000529/LER-2D1986-2D048-2C_-3Aon_860717-2Csafety_Injection_Tanks_-28SIT-29_Inoperable_Due_to_Wide_Range_Level_Exceeding_High_Level_Limit.Caused_by_Personnel_Error.Order_Statin…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000529/LER-1986-048, :on 860717,safety Injection Tanks (SIT) Inoperable Due to Wide Range Level Exceeding High Level Limit.Caused by Personnel Error.Order Stating Importance of SIT Level Monitoring During Heatup Issued

LER-1986-025, :on 860701,review of Tech Spec 3.3.3.8 Revealed Four Differences Between Installed Fire Detection Zones & Operability Requirements.Caused by Personnel Error.Fire Watch Established
type: Subject
label: 05000346/LER-1986-025, :on 860701,review of Tech Spec 3.3.3.8 Revealed Four Differences Between Installed Fire Detection Zones & Operability Requirements.Caused by Personnel Error.Fire Watch Established
page: https://kanterella.com/05000346/LER-2D1986-2D025-2C_-3Aon_860701-2Creview_of_Tech_Spec_3.3.3.8_Revealed_Four_Differences_Between_Installed_Fire_Detection_Zones_-26_Operability_Requirements.Caused_by_P…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000346/LER-1986-025, :on 860701,review of Tech Spec 3.3.3.8 Revealed Four Differences Between Installed Fire Detection Zones & Operability Requirements.Caused by Personnel Error.Fire Watch Established

01 Revised
type: Subject
label: 05000413/LER-1986-014, :on 860312,periodic Surveillance Test to Exercise Control Rods Not Performed within Required Tech Spec Interval.Caused by Inadequate Procedure.Step 12.2 of Procedure PT/1/A/4600/01 Revised
page: https://kanterella.com/05000413/LER-2D1986-2D014-2C_-3Aon_860312-2Cperiodic_Surveillance_Test_to_Exercise_Control_Rods_Not_Performed_within_Required_Tech_Spec_Interval.Caused_by_Inadequate_Procedure.S…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000413/LER-1986-014, :on 860312,periodic Surveillance Test to Exercise Control Rods Not Performed within Required Tech Spec Interval.Caused by Inadequate Procedure.Step 12.2 of Procedure PT/1/A/4600/01 Revised

LER-1997-012-01, :on 971214,drywell Personnel Airlock Outer Door Seals Local Leak Rate Test Was Not Properly Performed.Caused by Inattention to Detail on Part of Mechanic Who Installed Label.Removed Incorrect Label
type: Subject
label: 05000333/LER-1997-012-01, :on 971214,drywell Personnel Airlock Outer Door Seals Local Leak Rate Test Was Not Properly Performed.Caused by Inattention to Detail on Part of Mechanic Who Installed Label.Removed Incorrect Label
page: https://kanterella.com/05000333/LER-2D1997-2D012-2D01-2C_-3Aon_971214-2Cdrywell_Personnel_Airlock_Outer_Door_Seals_Local_Leak_Rate_Test_Was_Not_Properly_Performed.Caused_by_Inattention_to_Detail_on_Pa…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000333/LER-1997-012-01, :on 971214,drywell Personnel Airlock Outer Door Seals Local Leak Rate Test Was Not Properly Performed.Caused by Inattention to Detail on Part of Mechanic Who Installed Label.Removed Incorrect Label

O Sampling Since 860927.Caused by Cognitive Personnel Error. Procedure Revised Re Valve Identification
type: Subject
label: 05000528/LER-1986-051, :on 860930,determined That 50,000 Gallons of Effluent Chemical Waste Discharged to Evaporative Ponds W/O Sampling Since 860927.Caused by Cognitive Personnel Error. Procedure Revised Re Valve Identification
page: https://kanterella.com/05000528/LER-2D1986-2D051-2C_-3Aon_860930-2Cdetermined_That_50-2C000_Gallons_of_Effluent_Chemical_Waste_Discharged_to_Evaporative_Ponds_W/O_Sampling_Since_860927.Caused_by_Cogni…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000528/LER-1986-051, :on 860930,determined That 50,000 Gallons of Effluent Chemical Waste Discharged to Evaporative Ponds W/O Sampling Since 860927.Caused by Cognitive Personnel Error. Procedure Revised Re Valve Identification

Worst Wear Repositioned or isolated.Re-exam Planned Next Refueling Outage
type: Subject
label: 05000334/LER-1988-010, :on 871214,incore Instrumentation Thimble Tube Wear Discovered.Caused by Flow Induced Vibration.Tubes W/ Worst Wear Repositioned or isolated.Re-exam Planned Next Refueling Outage
page: https://kanterella.com/05000334/LER-2D1988-2D010-2C_-3Aon_871214-2Cincore_Instrumentation_Thimble_Tube_Wear_Discovered.Caused_by_Flow_Induced_Vibration.Tubes_W/_Worst_Wear_Repositioned_or_isolated.Re-…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000334/LER-1988-010, :on 871214,incore Instrumentation Thimble Tube Wear Discovered.Caused by Flow Induced Vibration.Tubes W/ Worst Wear Repositioned or isolated.Re-exam Planned Next Refueling Outage

Threaded Portion of Bolt Extending Through Lower Core Barrel.Caused by Transgranular Fracture.Bolt Replaced
type: Subject
label: 05000334/LER-1988-011, :on 880103,one of 12 Bolts Which Secure Thermal Shield to Lower Core Barrel,Found Severed W/Threaded Portion of Bolt Extending Through Lower Core Barrel.Caused by Transgranular Fracture.Bolt Replaced
page: https://kanterella.com/05000334/LER-2D1988-2D011-2C_-3Aon_880103-2Cone_of_12_Bolts_Which_Secure_Thermal_Shield_to_Lower_Core_Barrel-2CFound_Severed_W/Threaded_Portion_of_Bolt_Extending_Through_Lower_C…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000334/LER-1988-011, :on 880103,one of 12 Bolts Which Secure Thermal Shield to Lower Core Barrel,Found Severed W/Threaded Portion of Bolt Extending Through Lower Core Barrel.Caused by Transgranular Fracture.Bolt Replaced

LER-1988-010-02, :on 880525,determined That Configuration of Recombiner Bldg Ventilation Radiation Noble Gas Monitors Defeated Annunciation Required by Tech Specs.Caused by Procedure Inadequacy.Procedures Revised
type: Subject
label: 05000321/LER-1988-010-02, :on 880525,determined That Configuration of Recombiner Bldg Ventilation Radiation Noble Gas Monitors Defeated Annunciation Required by Tech Specs.Caused by Procedure Inadequacy.Procedures Revised
page: https://kanterella.com/05000321/LER-2D1988-2D010-2D02-2C_-3Aon_880525-2Cdetermined_That_Configuration_of_Recombiner_Bldg_Ventilation_Radiation_Noble_Gas_Monitors_Defeated_Annunciation_Required_by_Tech…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000321/LER-1988-010-02, :on 880525,determined That Configuration of Recombiner Bldg Ventilation Radiation Noble Gas Monitors Defeated Annunciation Required by Tech Specs.Caused by Procedure Inadequacy.Procedures Revised

LER-1988-016, :on 880517,unexpected Actuation of Inboard Portion of Reactor Bldg Isolation Control Sys Occurred, Resulting in Closure of Train a Isolation Dampers.Caused by Personnel Error.Work Process Revised
type: Subject
label: 05000293/LER-1988-016, :on 880517,unexpected Actuation of Inboard Portion of Reactor Bldg Isolation Control Sys Occurred, Resulting in Closure of Train a Isolation Dampers.Caused by Personnel Error.Work Process Revised
page: https://kanterella.com/05000293/LER-2D1988-2D016-2C_-3Aon_880517-2Cunexpected_Actuation_of_Inboard_Portion_of_Reactor_Bldg_Isolation_Control_Sys_Occurred-2C_Resulting_in_Closure_of_Train_a_Isolation_D…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000293/LER-1988-016, :on 880517,unexpected Actuation of Inboard Portion of Reactor Bldg Isolation Control Sys Occurred, Resulting in Closure of Train a Isolation Dampers.Caused by Personnel Error.Work Process Revised

LER-1988-021, :on 880719,discovered Problem Involving Solenoid Valves Installed in safety-related Applications. Caused by Incorrect Assumption.Mod Prepared to Replace Four Valves & Form Specifying Design Data Revised
type: Subject
label: 05000293/LER-1988-021, :on 880719,discovered Problem Involving Solenoid Valves Installed in safety-related Applications. Caused by Incorrect Assumption.Mod Prepared to Replace Four Valves & Form Specifying Design Data Revised
page: https://kanterella.com/05000293/LER-2D1988-2D021-2C_-3Aon_880719-2Cdiscovered_Problem_Involving_Solenoid_Valves_Installed_in_safety-2Drelated_Applications._Caused_by_Incorrect_Assumption.Mod_Prepared_…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000293/LER-1988-021, :on 880719,discovered Problem Involving Solenoid Valves Installed in safety-related Applications. Caused by Incorrect Assumption.Mod Prepared to Replace Four Valves & Form Specifying Design Data Revised

LER-1988-002-02, :on 880619,pressurizer Level & Cooldown Rate Exceeded Due to Inadequate Test Procedure.Caused by Procedural Inadequacies.Test Procedure Will Be Revised to Prevent Recurrence of Event
type: Subject
label: 05000289/LER-1988-002-02, :on 880619,pressurizer Level & Cooldown Rate Exceeded Due to Inadequate Test Procedure.Caused by Procedural Inadequacies.Test Procedure Will Be Revised to Prevent Recurrence of Event
page: https://kanterella.com/05000289/LER-2D1988-2D002-2D02-2C_-3Aon_880619-2Cpressurizer_Level_-26_Cooldown_Rate_Exceeded_Due_to_Inadequate_Test_Procedure.Caused_by_Procedural_Inadequacies.Test_Procedure_W…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000289/LER-1988-002-02, :on 880619,pressurizer Level & Cooldown Rate Exceeded Due to Inadequate Test Procedure.Caused by Procedural Inadequacies.Test Procedure Will Be Revised to Prevent Recurrence of Event

LER-1988-003, :on 880117,spurious Valve Closure of RWCU Primary Containment Isolation Sys Noted.Caused by Spurious Isolation of Valve.Work Activities in Main Control Room & Other Sys Operations Reviewed
type: Subject
label: 05000366/LER-1988-003, :on 880117,spurious Valve Closure of RWCU Primary Containment Isolation Sys Noted.Caused by Spurious Isolation of Valve.Work Activities in Main Control Room & Other Sys Operations Reviewed
page: https://kanterella.com/05000366/LER-2D1988-2D003-2C_-3Aon_880117-2Cspurious_Valve_Closure_of_RWCU_Primary_Containment_Isolation_Sys_Noted.Caused_by_Spurious_Isolation_of_Valve.Work_Activities_in_Main_…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000366/LER-1988-003, :on 880117,spurious Valve Closure of RWCU Primary Containment Isolation Sys Noted.Caused by Spurious Isolation of Valve.Work Activities in Main Control Room & Other Sys Operations Reviewed

LER-1987-020-03, :on 871211,several Incidents on Both Units Where Plant Cooldown & Heatup Rates Exceeded Administrative Limits & One Violation of Tech Spec Limits.Caused by Personnel Error & Mgt Deficiency
type: Subject
label: 05000370/LER-1987-020-03, :on 871211,several Incidents on Both Units Where Plant Cooldown & Heatup Rates Exceeded Administrative Limits & One Violation of Tech Spec Limits.Caused by Personnel Error & Mgt Deficiency
page: https://kanterella.com/05000370/LER-2D1987-2D020-2D03-2C_-3Aon_871211-2Cseveral_Incidents_on_Both_Units_Where_Plant_Cooldown_-26_Heatup_Rates_Exceeded_Administrative_Limits_-26_One_Violation_of_Tech_S…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000370/LER-1987-020-03, :on 871211,several Incidents on Both Units Where Plant Cooldown & Heatup Rates Exceeded Administrative Limits & One Violation of Tech Spec Limits.Caused by Personnel Error & Mgt Deficiency

LER-1987-076, :on 871127,instrument Panel 1-1513-P5-HMA Inoperable for More than 7 Days.Caused by Personnel Error. Personnel Counseled on Control & Temporary Storage of Matls During in-process Work
type: Subject
label: 05000424/LER-1987-076, :on 871127,instrument Panel 1-1513-P5-HMA Inoperable for More than 7 Days.Caused by Personnel Error. Personnel Counseled on Control & Temporary Storage of Matls During in-process Work
page: https://kanterella.com/05000424/LER-2D1987-2D076-2C_-3Aon_871127-2Cinstrument_Panel_1-2D1513-2DP5-2DHMA_Inoperable_for_More_than_7_Days.Caused_by_Personnel_Error._Personnel_Counseled_on_Control_-26_Te…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000424/LER-1987-076, :on 871127,instrument Panel 1-1513-P5-HMA Inoperable for More than 7 Days.Caused by Personnel Error. Personnel Counseled on Control & Temporary Storage of Matls During in-process Work

05000366/LER-1987-016-02, :on 871231,surveillance Not Performed within Time Limit.Caused by Personnel Error.Surveillance Performed, Verified & Schedule Modified.Personnel Counseled. W/88018 Ltr
type: Subject
page: https://kanterella.com/05000366/LER-2D1987-2D016-2D02-2C_-3Aon_871231-2Csurveillance_Not_Performed_within_Time_Limit.Caused_by_Personnel_Error.Surveillance_Performed-2C_Verified_-26_Schedule_Modified.…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000366/LER-1987-016-02, :on 871231,surveillance Not Performed within Time Limit.Caused by Personnel Error.Surveillance Performed, Verified & Schedule Modified.Personnel Counseled. W/88018 Ltr

LER-1987-072, :on 871121,Tech Spec Surveillance Re Readings from Plant Safety Monitoring Sys Data Displays Inadequately Performed.Caused by Inadequate Training of Auxiliary Plant Operator.Training Will Be Enhanced
type: Subject
label: 05000424/LER-1987-072, :on 871121,Tech Spec Surveillance Re Readings from Plant Safety Monitoring Sys Data Displays Inadequately Performed.Caused by Inadequate Training of Auxiliary Plant Operator.Training Will Be Enhanced
page: https://kanterella.com/05000424/LER-2D1987-2D072-2C_-3Aon_871121-2CTech_Spec_Surveillance_Re_Readings_from_Plant_Safety_Monitoring_Sys_Data_Displays_Inadequately_Performed.Caused_by_Inadequate_Trainin…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000424/LER-1987-072, :on 871121,Tech Spec Surveillance Re Readings from Plant Safety Monitoring Sys Data Displays Inadequately Performed.Caused by Inadequate Training of Auxiliary Plant Operator.Training Will Be Enhanced

LER-1986-004-03, :on 860321,during Maint,Esf Actuation Occurred Immediately Following Attempts to Remove Broken Drill Bit from Control Board.Cause Undetermined.Incident Will Be Reviewed as Supplementary Personnel Training
type: Subject
label: 05000370/LER-1986-004-03, :on 860321,during Maint,Esf Actuation Occurred Immediately Following Attempts to Remove Broken Drill Bit from Control Board.Cause Undetermined.Incident Will Be Reviewed as Supplementary Personnel Training
page: https://kanterella.com/05000370/LER-2D1986-2D004-2D03-2C_-3Aon_860321-2Cduring_Maint-2CEsf_Actuation_Occurred_Immediately_Following_Attempts_to_Remove_Broken_Drill_Bit_from_Control_Board.Cause_Undeter…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000370/LER-1986-004-03, :on 860321,during Maint,Esf Actuation Occurred Immediately Following Attempts to Remove Broken Drill Bit from Control Board.Cause Undetermined.Incident Will Be Reviewed as Supplementary Personnel Training

LER-1985-022-01, :on 850928,Exxon Nuclear Corp Informed Util of Error in Large Break LOCA Analysis Which Resulted in Peak Clad Temp Being Underpredicted.Reactor Power & High Flux Trip Setpoint Increased within New Limits
type: Subject
label: 05000261/LER-1985-022-01, :on 850928,Exxon Nuclear Corp Informed Util of Error in Large Break LOCA Analysis Which Resulted in Peak Clad Temp Being Underpredicted.Reactor Power & High Flux Trip Setpoint Increased within New Limits
page: https://kanterella.com/05000261/LER-2D1985-2D022-2D01-2C_-3Aon_850928-2CExxon_Nuclear_Corp_Informed_Util_of_Error_in_Large_Break_LOCA_Analysis_Which_Resulted_in_Peak_Clad_Temp_Being_Underpredicted.Rea…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000261/LER-1985-022-01, :on 850928,Exxon Nuclear Corp Informed Util of Error in Large Break LOCA Analysis Which Resulted in Peak Clad Temp Being Underpredicted.Reactor Power & High Flux Trip Setpoint Increased within New Limits

05000327/LER-1985-033-01, :on 850827,during Weekly Train B Chlorine Detector Function Testing,Esf Actuation Occurred for Main Control Room Isolation.Caused by Personnel Error.Personnel Counseled
type: Subject
page: https://kanterella.com/05000327/LER-2D1985-2D033-2D01-2C_-3Aon_850827-2Cduring_Weekly_Train_B_Chlorine_Detector_Function_Testing-2CEsf_Actuation_Occurred_for_Main_Control_Room_Isolation.Caused_by_Pers…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000327/LER-1985-033-01, :on 850827,during Weekly Train B Chlorine Detector Function Testing,Esf Actuation Occurred for Main Control Room Isolation.Caused by Personnel Error.Personnel Counseled

LER-1985-003-01, :on 851214,while in Cold Shutdown,Emergency Bus 480-volt Ac Required to Be Operable Per Tech Specs Tagged Out of Svc to Perform Maint.Caused by Personnel Error.Bus Restored to Svc
type: Subject
label: 05000423/LER-1985-003-01, :on 851214,while in Cold Shutdown,Emergency Bus 480-volt Ac Required to Be Operable Per Tech Specs Tagged Out of Svc to Perform Maint.Caused by Personnel Error.Bus Restored to Svc
page: https://kanterella.com/05000423/LER-2D1985-2D003-2D01-2C_-3Aon_851214-2Cwhile_in_Cold_Shutdown-2CEmergency_Bus_480-2Dvolt_Ac_Required_to_Be_Operable_Per_Tech_Specs_Tagged_Out_of_Svc_to_Perform_Maint.C…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000423/LER-1985-003-01, :on 851214,while in Cold Shutdown,Emergency Bus 480-volt Ac Required to Be Operable Per Tech Specs Tagged Out of Svc to Perform Maint.Caused by Personnel Error.Bus Restored to Svc

LER-1985-053, :on 851212,discovered That Portion of Core Protection Calculator Tech Spec Functional Test Not Performed for Several Intervals.Caused by Procedural Change Eliminating Requirement.Procedure Changed
type: Subject
label: 05000382/LER-1985-053, :on 851212,discovered That Portion of Core Protection Calculator Tech Spec Functional Test Not Performed for Several Intervals.Caused by Procedural Change Eliminating Requirement.Procedure Changed
page: https://kanterella.com/05000382/LER-2D1985-2D053-2C_-3Aon_851212-2Cdiscovered_That_Portion_of_Core_Protection_Calculator_Tech_Spec_Functional_Test_Not_Performed_for_Several_Intervals.Caused_by_Procedu…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000382/LER-1985-053, :on 851212,discovered That Portion of Core Protection Calculator Tech Spec Functional Test Not Performed for Several Intervals.Caused by Procedural Change Eliminating Requirement.Procedure Changed

LER-1985-013, :on 850609,main Feedwater Pump 1 Tripped on Overspeed Due to Control Problem.Reactor Also Tripped on High RCS Pressure Because of Inadequate Feedwater.Corrective Actions Not Yet Determined
type: Subject
label: 05000346/LER-1985-013, :on 850609,main Feedwater Pump 1 Tripped on Overspeed Due to Control Problem.Reactor Also Tripped on High RCS Pressure Because of Inadequate Feedwater.Corrective Actions Not Yet Determined
page: https://kanterella.com/05000346/LER-2D1985-2D013-2C_-3Aon_850609-2Cmain_Feedwater_Pump_1_Tripped_on_Overspeed_Due_to_Control_Problem.Reactor_Also_Tripped_on_High_RCS_Pressure_Because_of_Inadequate_Fee…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000346/LER-1985-013, :on 850609,main Feedwater Pump 1 Tripped on Overspeed Due to Control Problem.Reactor Also Tripped on High RCS Pressure Because of Inadequate Feedwater.Corrective Actions Not Yet Determined

LER-1985-012, :on 851020,HPCI Sys Inoperable During Daily Exercising of Turbine Auxiliary Lube Oil Pump.Caused by Burned Commutator Segments & Shorted Armature Coils on Oil Pump Motor.Motor Rebuilt
type: Subject
label: 05000298/LER-1985-012, :on 851020,HPCI Sys Inoperable During Daily Exercising of Turbine Auxiliary Lube Oil Pump.Caused by Burned Commutator Segments & Shorted Armature Coils on Oil Pump Motor.Motor Rebuilt
page: https://kanterella.com/05000298/LER-2D1985-2D012-2C_-3Aon_851020-2CHPCI_Sys_Inoperable_During_Daily_Exercising_of_Turbine_Auxiliary_Lube_Oil_Pump.Caused_by_Burned_Commutator_Segments_-26_Shorted_Armat…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000298/LER-1985-012, :on 851020,HPCI Sys Inoperable During Daily Exercising of Turbine Auxiliary Lube Oil Pump.Caused by Burned Commutator Segments & Shorted Armature Coils on Oil Pump Motor.Motor Rebuilt

LER-1984-015, :on 841029,during Breaker Testing,Load Shedding Initiated & Main Feedpump Tripped Leading to Low Steam Generator Level & Reactor Trip.Caused by Inadequate Procedures.Procedure Revised
type: Subject
label: 05000281/LER-1984-015, :on 841029,during Breaker Testing,Load Shedding Initiated & Main Feedpump Tripped Leading to Low Steam Generator Level & Reactor Trip.Caused by Inadequate Procedures.Procedure Revised
page: https://kanterella.com/05000281/LER-2D1984-2D015-2C_-3Aon_841029-2Cduring_Breaker_Testing-2CLoad_Shedding_Initiated_-26_Main_Feedpump_Tripped_Leading_to_Low_Steam_Generator_Level_-26_Reactor_Trip.Caus…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000281/LER-1984-015, :on 841029,during Breaker Testing,Load Shedding Initiated & Main Feedpump Tripped Leading to Low Steam Generator Level & Reactor Trip.Caused by Inadequate Procedures.Procedure Revised

LER-1985-022, :on 851015,circulator B Tripped on Low buffer- mid-buffer Differential Pressure.Caused by Small Amount of Buffer Helium Allowed to Vent Through buffer-mid-buffer Knockout Pot.Drain Procedure Revised
type: Subject
label: 05000267/LER-1985-022, :on 851015,circulator B Tripped on Low buffer- mid-buffer Differential Pressure.Caused by Small Amount of Buffer Helium Allowed to Vent Through buffer-mid-buffer Knockout Pot.Drain Procedure Revised
page: https://kanterella.com/05000267/LER-2D1985-2D022-2C_-3Aon_851015-2Ccirculator_B_Tripped_on_Low_buffer-2D_mid-2Dbuffer_Differential_Pressure.Caused_by_Small_Amount_of_Buffer_Helium_Allowed_to_Vent_Thro…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000267/LER-1985-022, :on 851015,circulator B Tripped on Low buffer- mid-buffer Differential Pressure.Caused by Small Amount of Buffer Helium Allowed to Vent Through buffer-mid-buffer Knockout Pot.Drain Procedure Revised

LER-1985-049-01, :on 850807,inadvertent Isolation of Both Discharge Headers of Fire Protection (Ry) Pumps Occurred. Caused by Personnel Error.Correct Ry Header Isolated. Procedure 2-18 Revised
type: Subject
label: 05000413/LER-1985-049-01, :on 850807,inadvertent Isolation of Both Discharge Headers of Fire Protection (Ry) Pumps Occurred. Caused by Personnel Error.Correct Ry Header Isolated. Procedure 2-18 Revised
page: https://kanterella.com/05000413/LER-2D1985-2D049-2D01-2C_-3Aon_850807-2Cinadvertent_Isolation_of_Both_Discharge_Headers_of_Fire_Protection_-28Ry-29_Pumps_Occurred._Caused_by_Personnel_Error.Correct_Ry…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000413/LER-1985-049-01, :on 850807,inadvertent Isolation of Both Discharge Headers of Fire Protection (Ry) Pumps Occurred. Caused by Personnel Error.Correct Ry Header Isolated. Procedure 2-18 Revised

LER-1985-029, :on 850630,reactor Trip Occurred Due to High Water Level in Steam Generator 2.Caused by Valve Positioners for Main Feedwater Regulating Valves Out of Adjustment. Positioners Adjusted
type: Subject
label: 05000382/LER-1985-029, :on 850630,reactor Trip Occurred Due to High Water Level in Steam Generator 2.Caused by Valve Positioners for Main Feedwater Regulating Valves Out of Adjustment. Positioners Adjusted
page: https://kanterella.com/05000382/LER-2D1985-2D029-2C_-3Aon_850630-2Creactor_Trip_Occurred_Due_to_High_Water_Level_in_Steam_Generator_2.Caused_by_Valve_Positioners_for_Main_Feedwater_Regulating_Valves_O…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000382/LER-1985-029, :on 850630,reactor Trip Occurred Due to High Water Level in Steam Generator 2.Caused by Valve Positioners for Main Feedwater Regulating Valves Out of Adjustment. Positioners Adjusted

05000424/LER-1996-012-01, :on 961127,main Generator Stator Cooling Short Circuit Leads to Turbine/Reactor Trip.Caused by Metal Tag Coming in Contact W/Terminal Strip.Fuse Replaced & Metal Tags Removed
type: Subject
page: https://kanterella.com/05000424/LER-2D1996-2D012-2D01-2C_-3Aon_961127-2Cmain_Generator_Stator_Cooling_Short_Circuit_Leads_to_Turbine/Reactor_Trip.Caused_by_Metal_Tag_Coming_in_Contact_W/Terminal_Strip…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000424/LER-1996-012-01, :on 961127,main Generator Stator Cooling Short Circuit Leads to Turbine/Reactor Trip.Caused by Metal Tag Coming in Contact W/Terminal Strip.Fuse Replaced & Metal Tags Removed

05000296/LER-1984-014-02, :on 841206,split Ring,Retaining Ring & Snap Ring Missing from Limitorque Valve Operator.Retaining Rings for Worn Shaft Gear Installed.Operator & Drive Motor Reassembled
type: Subject
page: https://kanterella.com/05000296/LER-2D1984-2D014-2D02-2C_-3Aon_841206-2Csplit_Ring-2CRetaining_Ring_-26_Snap_Ring_Missing_from_Limitorque_Valve_Operator.Retaining_Rings_for_Worn_Shaft_Gear_Installed.O…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000296/LER-1984-014-02, :on 841206,split Ring,Retaining Ring & Snap Ring Missing from Limitorque Valve Operator.Retaining Rings for Worn Shaft Gear Installed.Operator & Drive Motor Reassembled

LER-1984-010, :on 840924,reactor Water Cleanup (RWCU) Inboard & Outboard Isolation valves,2G31-F001 & 2G31-F004, Respectively,Isolated Due to High Differential Flow Signal. Caused by RWCU Demineralizer Not Full
type: Subject
label: 05000366/LER-1984-010, :on 840924,reactor Water Cleanup (RWCU) Inboard & Outboard Isolation valves,2G31-F001 & 2G31-F004, Respectively,Isolated Due to High Differential Flow Signal. Caused by RWCU Demineralizer Not Full
page: https://kanterella.com/05000366/LER-2D1984-2D010-2C_-3Aon_840924-2Creactor_Water_Cleanup_-28RWCU-29_Inboard_-26_Outboard_Isolation_valves-2C2G31-2DF001_-26_2G31-2DF004-2C_Respectively-2CIsolated_Due_t…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000366/LER-1984-010, :on 840924,reactor Water Cleanup (RWCU) Inboard & Outboard Isolation valves,2G31-F001 & 2G31-F004, Respectively,Isolated Due to High Differential Flow Signal. Caused by RWCU Demineralizer Not Full

LER-1996-002-08, :on 960323,TS Required Fire Watch Missed.Caused by Personnel Error & Breakdown in Communications Between Sys Engineers & Fire Watch Group.Fire Watch Staff Counseled & Retrained
type: Subject
label: 05000373/LER-1996-002-08, :on 960323,TS Required Fire Watch Missed.Caused by Personnel Error & Breakdown in Communications Between Sys Engineers & Fire Watch Group.Fire Watch Staff Counseled & Retrained
page: https://kanterella.com/05000373/LER-2D1996-2D002-2D08-2C_-3Aon_960323-2CTS_Required_Fire_Watch_Missed.Caused_by_Personnel_Error_-26_Breakdown_in_Communications_Between_Sys_Engineers_-26_Fire_Watch_Gro…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000373/LER-1996-002-08, :on 960323,TS Required Fire Watch Missed.Caused by Personnel Error & Breakdown in Communications Between Sys Engineers & Fire Watch Group.Fire Watch Staff Counseled & Retrained

LER-1984-010, :on 840225,reactor Manually Scrammed When One of Six Automatic Depressurization Sys Safety Relief Valves Stuck Open & Would Not Close in 2 Minutes.Caused by Faulty Valve Solenoid.Solenoid Replaced
type: Subject
label: 05000387/LER-1984-010, :on 840225,reactor Manually Scrammed When One of Six Automatic Depressurization Sys Safety Relief Valves Stuck Open & Would Not Close in 2 Minutes.Caused by Faulty Valve Solenoid.Solenoid Replaced
page: https://kanterella.com/05000387/LER-2D1984-2D010-2C_-3Aon_840225-2Creactor_Manually_Scrammed_When_One_of_Six_Automatic_Depressurization_Sys_Safety_Relief_Valves_Stuck_Open_-26_Would_Not_Close_in_2_Min…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000387/LER-1984-010, :on 840225,reactor Manually Scrammed When One of Six Automatic Depressurization Sys Safety Relief Valves Stuck Open & Would Not Close in 2 Minutes.Caused by Faulty Valve Solenoid.Solenoid Replaced

05000348/LER-1995-005-01, :on 950611,spurious MSIV Closure Resulted in Reactor Trip.Caused by Water Intrusion from Room Cooler Leakage.Room Cooler Leak Repaired
type: Subject
page: https://kanterella.com/05000348/LER-2D1995-2D005-2D01-2C_-3Aon_950611-2Cspurious_MSIV_Closure_Resulted_in_Reactor_Trip.Caused_by_Water_Intrusion_from_Room_Cooler_Leakage.Room_Cooler_Leak_Repaired
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000348/LER-1995-005-01, :on 950611,spurious MSIV Closure Resulted in Reactor Trip.Caused by Water Intrusion from Room Cooler Leakage.Room Cooler Leak Repaired

LER-1981-112-03, Torus to Rx Bldg Differential Pressure Switches 1T48-N210,N211,2T48-N210 & N211 Proof Press Not within Tech Spec Limit.Caused by Switch Misapplication.Also Reported Per Part 21
type: Subject
label: 05000321/LER-1981-112-03, Torus to Rx Bldg Differential Pressure Switches 1T48-N210,N211,2T48-N210 & N211 Proof Press Not within Tech Spec Limit.Caused by Switch Misapplication.Also Reported Per Part 21
page: https://kanterella.com/05000321/LER-2D1981-2D112-2D03-2C_Torus_to_Rx_Bldg_Differential_Pressure_Switches_1T48-2DN210-2CN211-2C2T48-2DN210_-26_N211_Proof_Press_Not_within_Tech_Spec_Limit.Caused_by_Swit…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000321/LER-1981-112-03, Torus to Rx Bldg Differential Pressure Switches 1T48-N210,N211,2T48-N210 & N211 Proof Press Not within Tech Spec Limit.Caused by Switch Misapplication.Also Reported Per Part 21

LER-1990-006, :on 900811,emergency Diesel Generators Failed Tech Spec Surveillance Test.Investigation Team Formed to Review Testing History & Determine Cause.Design Change to Replace Emergency Diesel Generators Initiated
type: Subject
label: 05000029/LER-1990-006, :on 900811,emergency Diesel Generators Failed Tech Spec Surveillance Test.Investigation Team Formed to Review Testing History & Determine Cause.Design Change to Replace Emergency Diesel Generators Initiated
page: https://kanterella.com/05000029/LER-2D1990-2D006-2C_-3Aon_900811-2Cemergency_Diesel_Generators_Failed_Tech_Spec_Surveillance_Test.Investigation_Team_Formed_to_Review_Testing_History_-26_Determine_Caus…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000029/LER-1990-006, :on 900811,emergency Diesel Generators Failed Tech Spec Surveillance Test.Investigation Team Formed to Review Testing History & Determine Cause.Design Change to Replace Emergency Diesel Generators Initiated

05000282/LER-1980-018-01, /01T-0:on 800701,unit Was Shut Down Due to Leaking Tube in Hot Leg of Vertical Steam Generator 12,Westinghouse Series 51.Cause Not Stated.Defective Tube Will Be Plugged
type: Subject
page: https://kanterella.com/05000282/LER-2D1980-2D018-2D01-2C_/01T-2D0-3Aon_800701-2Cunit_Was_Shut_Down_Due_to_Leaking_Tube_in_Hot_Leg_of_Vertical_Steam_Generator_12-2CWestinghouse_Series_51.Cause_Not_Stat…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000282/LER-1980-018-01, /01T-0:on 800701,unit Was Shut Down Due to Leaking Tube in Hot Leg of Vertical Steam Generator 12,Westinghouse Series 51.Cause Not Stated.Defective Tube Will Be Plugged

LER-1988-012-01, :on 880905,control Rod K-12 Dropped from 228 Steps to 0 Step,Causing Turbine Runback to 60- Power.Cause of Drop Under Investigation.Insp of Control Rod K-12 Will Be Performed During Current Refueling Outage
type: Subject
label: 05000251/LER-1988-012-01, :on 880905,control Rod K-12 Dropped from 228 Steps to 0 Step,Causing Turbine Runback to 60% Power.Cause of Drop Under Investigation.Insp of Control Rod K-12 Will Be Performed During Current Refueling Outage
page: https://kanterella.com/05000251/LER-2D1988-2D012-2D01-2C_-3Aon_880905-2Ccontrol_Rod_K-2D12_Dropped_from_228_Steps_to_0_Step-2CCausing_Turbine_Runback_to_60-_Power.Cause_of_Drop_Under_Investigation.Ins…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000251/LER-1988-012-01, :on 880905,control Rod K-12 Dropped from 228 Steps to 0 Step,Causing Turbine Runback to 60% Power.Cause of Drop Under Investigation.Insp of Control Rod K-12 Will Be Performed During Current Refueling Outage

ML21272A162
type: Subject
page: https://kanterella.com/ML21272A162
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: ML21272A162

LER-1998-001-01, :on 980328,manual Reactor Trip Was Noted.Caused by Dropped Control Rod K-2 & F-10.Affected Cable & Connectors Were Replaced During Unit 2 Twelfth Refueling Outage & Tested During Startup
type: Subject
label: 05000364/LER-1998-001-01, :on 980328,manual Reactor Trip Was Noted.Caused by Dropped Control Rod K-2 & F-10.Affected Cable & Connectors Were Replaced During Unit 2 Twelfth Refueling Outage & Tested During Startup
page: https://kanterella.com/05000364/LER-2D1998-2D001-2D01-2C_-3Aon_980328-2Cmanual_Reactor_Trip_Was_Noted.Caused_by_Dropped_Control_Rod_K-2D2_-26_F-2D10.Affected_Cable_-26_Connectors_Were_Replaced_During_…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000364/LER-1998-001-01, :on 980328,manual Reactor Trip Was Noted.Caused by Dropped Control Rod K-2 & F-10.Affected Cable & Connectors Were Replaced During Unit 2 Twelfth Refueling Outage & Tested During Startup

LER-1986-019, :on 860606,during Mode 1,reactor Trip Occurred on Low Pressurizer Pressure.Caused by Technician Deviation from Calibr Procedure.Progressive Discipline Administered. Guidelines Given to Technicians
type: Subject
label: 05000483/LER-1986-019, :on 860606,during Mode 1,reactor Trip Occurred on Low Pressurizer Pressure.Caused by Technician Deviation from Calibr Procedure.Progressive Discipline Administered. Guidelines Given to Technicians
page: https://kanterella.com/05000483/LER-2D1986-2D019-2C_-3Aon_860606-2Cduring_Mode_1-2Creactor_Trip_Occurred_on_Low_Pressurizer_Pressure.Caused_by_Technician_Deviation_from_Calibr_Procedure.Progressive_Di…
wiki namespace: 0
wiki page content language: en
NRC form: NRC Form 304
wiki page sort key: 05000483/LER-1986-019, :on 860606,during Mode 1,reactor Trip Occurred on Low Pressurizer Pressure.Caused by Technician Deviation from Calibr Procedure.Progressive Discipline Administered. Guidelines Given to Technicians

NRC form
type: ObjectProperty
page: https://kanterella.com/Property-3ANRC_form
wiki namespace: 102
wiki page content language: en
wiki page sort key: NRC form
type: wpg