Pages that link to "05000440/LER-2023-001, Manual ECCS Actuation Following Automatic Reactor Trip"
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The following pages link to 05000440/LER-2023-001, Manual ECCS Actuation Following Automatic Reactor Trip:
Displayed 4 items.
- 05000440/LER-2023-003, Plant Trip During Reactor Protection System Power Transfer (← links)
- 05000440/LER-2023-002, Main Steam Line Leakage Exceeded Technical Specification Limit (← links)
- ML23053A083 (redirect page) (← links)
- 05000440/LER-2023-001 (redirect page) (← links)
- 05000440/LER-2006-003 (← links)
- 05000440/LER-2001-004 (← links)
- 05000440/LER-2001-003 (← links)
- 05000440/LER-2001-002 (← links)
- 05000440/LER-2001-001 (← links)
- 05000440/LER-2017-001 (← links)
- 05000440/LER-1988-027, Forwards LERs 88-026 & 88-028.LER 88-027 Will Be Forthcoming (← links)
- 05000440/LER-1999-002, Forwards LER 99-002-00, LCO 3.0.3 Entered Due to TS Bases Statement Interpretation. Action Occurred After RHR Pump Failed to Start.Plant at No Time Was in Condition Where Required Decay Heat Removal System Were Not Available (← links)
- 05000440/LER-1986-085, Forwards LERs 86-083,86-084 & 86-086.LER 86-085 Will Be Sent Under Separate Cover (← links)
- ENS 56298 (← links)
- IR 05000440/2023001 (← links)
- 05000440/LER-2024-003, Technical Specification Required Shutdown Due to Increase in RCS Unidentified Leakage (← links)
- 05000440/LER-2024-002, Reactor Water Clean Up Leak Detection Loss of Safety Function (← links)
- 05000440/LER-2024-001, Operation of the Residual Heat Removal Loops B and C Alternate Keep Fill Configuration Was Prohibited by Technical Specifications and Resulted in an Unanalyzed Condition (← links)
- 05000440/LER-2023-003, Plant Trip During Reactor Protection System Power Transfer (← links)
- 05000440/LER-2023-002, Main Steam Line Leakage Exceeded Technical Specification Limit (← links)
- 05000440/LER-2023-001, Manual ECCS Actuation Following Automatic Reactor Trip (← links)
- 05000440/LER-2022-001, Low Pressure Core Spray Inoperable Due to Loss of Minimum Flow Valve (← links)
- 05000440/LER-2021-002, Re Core Monitoring System Software Modeling Error Results in Conditions Prohibited by Technical Specifications (← links)
- 05000440/LER-2021-001, Division 3 Eog Inoperability Resulting in an Operation or Condition Prohibited by Technical Specifications (← links)
- 05000440/LER-2020-002-01, Standby Liquid Control System Rendered Inoperable Due to Valve Misposition (← links)
- 05000440/LER-2020-002, Standby Liquid Control System Rendered Inoperable Due to Valve Misposition (← links)
- 05000440/LER-1998-001, :on 980506,instruction Rev Results in Inadequate Testing & Missed TS Sr.Caused by Human Error.On 980506,testing of PRM RM High Alarm Relay Contacts Was Performed (← links)
- 05000440/LER-1989-010, :on 890328,elevated Temp Condition Confirmed to Exist within Upper Region of Drywell.Caused by Insufficient Insulation Surrounding Refuel Bellows Creating Radiant Heat Source.Reflective Insulation Installed (← links)
- 05000440/LER-1989-005, :on 890224,drywell Head Holddown Bolts Found Detensioned When Head Removed for Refueling Outage.Caused by Inappropriate Original Installation Torque Value.Site Installation Instruction Revised (← links)
- 05000440/LER-1989-014, :on 890425,HPCS Actuated & Automatic Div 3 Diesel Generator Started.Caused by Personnel Error Due to Miscommunication.Operations Crew Counseled Re Importance of Knowing & Following Plant Procedures (← links)
- 05000440/LER-1989-022, :on 890627,deficient Surveillance Instruction Resulted in Scram Discharge Vol High Level Instrument Outside Tech Spec Allowable Values.Caused by Procedural Deficiency.Surveillance Instructions Revised (← links)
- 05000440/LER-1989-007, :on 890227,source-range Monitor Signal/Noise Ratio Not Verified Prior to Entering Operation Condition 5. Caused by Personnel Error.Personnel Counseled & Note Added to Tech Spec Rounds to Clarify Applicability Requirements (← links)
- 05000440/LER-1989-006, :on 890224,primary Containment Leakage Rate Through First MSIV Before Seat Drain Valves Exceeded Tech Spec Limit.Caused by Misalignment of Valve Disc.Seat Polishing & Machining of Poppet Seals Performed (← links)
- 05000440/LER-1989-008, :on 890301,control Room HVAC Sys Unexpectedly Started in Emergency Recirculation Mode During Performance of Surveillance Instruction.Caused by Procedural Deficiency. Both Instructions Were Modified (← links)
- 05000440/LER-1989-004, :on 890203,RWCU Sys Containment Isolation Occurred Due to High Pump Room Differential Temp.Caused by Component Failure.Failed Solenoid Valve Replaced (← links)
- 05000440/LER-1989-021, :on 890616,two Div 2 Time Delay Relays Set Outside Tech Spec Allowable Values.Caused by Procedural Deficiency.Calibr Instruction Revised to Delineate Proper Test Connections (← links)
- 05000440/LER-1989-020, :on 890616,Class 1 Welds Failed to Receive Preservice Exam Required by Tech Specs.Caused by Program Deficiency.Technical Staff Personnel Reviewed Const Documents Re Preservice Exam Records (← links)
- 05000440/LER-1989-019, :on 890613,unexpected Alternate Rod Insertion Initiated by Div 2 of Redundant Reactivity Control Sys During Surveillance Instruction.Caused by Inadequate Design. Surveillance Instructions Modified (← links)
- 05000440/LER-1989-013, :on 890415,unexpected Automatic Start of Emergency Svc Water Pump a Occurred Due to Partial Actuation of RCIC Sys Initiation Logic.Caused by Personnel Error. Technician Counseled Re Taking Proper Caution (← links)
- 05000440/LER-1989-001, :on 890111,div 2 Diesel Generator Declared Inoperable Due to Unsatisfactory Results for Fuel Oil Storage Tank Sample.Caused by Oxidation of Fuel Oil Due to Normal Aging.Dispersant Agent Added to Tank (← links)
- 05000440/LER-1989-012, :on 890409,unexpected Automatic Actuations of Containment Isolation Valves Occurred as Result of Manipulations to Electrical Distribution Sys Components. Caused by Deficient Instruction (← links)
- 05000440/LER-1989-011, :on 890408,automatic Start of Emergency Svc Water Pump Occurred Due to Actuation of RCIC Initiation Logic.Caused by Procedural Deficiency.Instruction Modified to Caution Operators About RCIC Initiation Signal (← links)
- 05000440/LER-1989-025, :on 890726 & 31,RWCU Sys Containment Isolations Occurred Due to High Indicated Differential Flow.Caused by Design Limitation of Instrumentation & Operational Constraints.Fill & Vent of Instrument Lines Ensured (← links)
- 05000440/LER-1989-024, :on 890723,entry Into Operational Condition 2 Completed W/Suppression Pool Makeup Sys Inoperable.On 890725,vent Valve Found Open & Uncapped.Caused by Personnel Errors.Technicians Involved W/Event Counselled (← links)
- 05000440/LER-1989-023, :on 890723,Operational Condition 2 (Startup) Completed W/Control Rod Inoperable.Caused by Improper Valve Lineup,Procedural Deficiency & Personnel Error.Procedure Will Be Modified Re Independent Verification (← links)
- 05000440/LER-1986-059, :on 860908,discovered That Div III Diesel Generator Inoperable for Approx 12 H W/O Required Tech Spec Actions Being Performed.Caused by Control Room Operators Error.Operators Counseled (← links)
- 05000440/LER-1989-018, :on 890529,reactor Vessel Low Water Level Trip Unit to Inboard,Balance of Plant Isolation Trip Sys Declared Inoperable.Caused by Personnel Error.Individual Retrained in Correct Interpretation of Tech Spec (← links)
- 05000440/LER-1989-017, :on 890525,Divs 1 & 2 Emergency Diesel Generators Declared Inoperable Resulting in Potential for Generator Trip.Caused by Design Deficiency in Ground Fault Detection & Trip Circuit.Design Changed.Part 21 Related (← links)
- 05000440/LER-1988-017, :on 880506,unexpected Scram of Group 3 Control Rods During Monthly Reactor Protection Sys Channel Test Occurred.Cause Not Readily Identified.Blown Fuse Replaced & Current & Voltage Monitored While Testing (← links)
- 05000440/LER-1989-016, :on 890517,Train a of Annulus Exhaust Gas Treatment Sys Started Automatically During Performance of Surveillance Instruction.Caused by Equipment Failure.Exact Cause of Failure Unknown.Switch Installed (← links)
- 05000440/LER-1989-009, :on 890321,discovered That Vent Sampler Flow Rate Monitor Had Inoperable Alarm Channel Since 890311 W/O Performing Action Required by Tech Spec.Caused by Personnel Error.Listed Alarms Reviewed (← links)
- 05000440/LER-1987-039, :on 870530,main Steam Line Inboard Isolation Valve Closed Unexpectedly.Caused by Suspected Bad Connection in Channel C NSSS Isolation Logic.Valve Closure Could Not Be Duplicated Through Troubleshooting & No Addl Action Planned (← links)
- 05000440/LER-1987-038, :on 870529,discovered That Div III Fuel Oil Out of Spec for Approx 48 H,Beginning on 870527,w/o Required Control Room Notification.Caused by Personnel Error. Personnel Counseled (← links)
- 05000440/LER-1987-037, :on 870527,reactor Scrammed on Steam Flow/ Feedwater Flow Mismatch.Caused by Failed Resistor within Motor Driven Feedwater Pump Controller.Card Containing Resistor Replaced & Control Circuit Calibr (← links)
- 05000440/LER-1989-015, :on 890512,discovered Error in Calculating Head Correction for Narrow Range Reactor Vessel Water Level. Caused by Design Deficiency.Transmitters Using Correct Head Correction Value Calculated & Adjusted (← links)
- 05000440/LER-1987-058, :on 870815,control Rods Withdrawn Prior to Performing Source Range Monitors Signal to Noise Ratio Verification.Caused by Operator Error.Operators Involved Counseled.Tech Specs Rounds Will Be Revised (← links)
- 05000440/LER-1987-057, :on 870813,reactor Protection Sys Actuation Occurred Due to Deficient Change to Surveillance Instructions.Caused by Inadequate Instruction for Flushing Sensing Lines.Surveillance Instructions Revised (← links)
- 05000440/LER-1987-056, :on 870812,RWCU Containment Inboard Isolation Valve Closed.Caused by Procedural Error of Wrong Terminal Identification.Surveillance Instruction Revised to Identify Correct Terminal Number (← links)
- 05000440/LER-1987-076, :on 871203,main Steam Drain Line Isolations Occurred.Caused by Inadequate Surveillance Instructions. Instructions Revised (← links)
- 05000440/LER-1987-054, :on 870722,discovered That Suppression Pool Swell Deflector Shields Required by Design Not Installed for Six Limitorque Operators.Shields Installed & as-built Drawings Completed to Reflect Installation (← links)
- 05000440/LER-1987-055, :on 870729,reactor Protection Sys Actuation Occurred Due to Trip Signal Generated by Neutron Monitoring Sys Aprm.Caused by Misposition of Switch S-3 on APRM Card. Failed APRM Card Replaced & Tested (← links)
- 05000440/LER-1987-053, :on 870714,discovered That Readings for Control Room Radiation & Source Range Neutron Monitors Not Recorded & Actions Required by Tech Specs 3.3.7.1 & 3.3.7.6 Not Taken on 870713.Caused by Personnel Error (← links)
- 05000440/LER-1987-075, :on 871114,Tech Spec Violated Due to Plant Exceeding 150 Psig W/Rcic Sys Inoperable.Caused by Personnel Error.Shift Supervisor Disciplined.Licensed Operator Will Be Formally Trained on Incident (← links)
- 05000440/LER-1987-074, :on 871114,RCWU Inboard Containment Isolation Occurred Due to High Differential Flow.Caused by Detector Low Flow Inaccuracies & Low Voltage Clip at Square Root Converters.Flow Design Will Be Evaluated & Changed (← links)
- 05000440/LER-1998-002-01, :on 980701,trip Unit Failure Initiated RCIC W/ Subsequent Reactor Scram.Caused by Design Application of Optical Isolator.Replaced Failed & Damaged Components & Verified Initiation Relay Contacts (← links)
- 05000440/LER-1987-073, :on 871029,three MSIVs Failed to Fast Close in Time Required by Tech Specs 3.4.7 & 3.6.4.On 871103,two MSIVs Failed to Close.Caused by Sticking of Fast Closure Dual Solenoid Air Pilot Valves.Elastomer Discs Replaced (← links)
- 05000440/LER-1987-072, :on 871027,following Improper Transfer of Station Loads,Reactor Scram Occurred Due to Reactor Water Level of Less than Level 3.Caused by Personnel Error. Engineering Design Change Will Be Implemented (← links)
- 05000440/LER-1987-071, :on 871027,RWCU Sys Containment Isolation Occurred.Caused by Faulty Temp Switch Module.Leak Detection Isolation Logic Bypass Switches Placed in Bypass Position When Performing Once Per Shift Channel Checks (← links)
- 05000440/LER-1987-070, :on 871024,loss of Reactor Protection Sys Bus Occurred Due to Overvoltage Trip of Electrical Protection Assembly.Cause Undetermined.Potential Cause Isolated to Voltage Regulator.Regulator Replaced (← links)
- 05000440/LER-1987-051, :on 870705,primary Containment Leakage Rate Through MSIV Lines A,B & D Exceeded Tech Spec 3.6.1.2.Caused by Worn MSIV Seats Due to Component Wear & Inadequate Mating & Sealing of Bonnet Pressure Seal Ring (← links)
- 05000440/LER-1987-027, :on 870413,manual Fast Reactor Shutdown Conducted Due to Loss of Condenser Vacuum & Steam Leak in Reactor Bldg.Vacuum Loss Caused by Hole in 24-inch Main Steam Drain Manifold.Manifold Replaced (← links)
- 05000440/LER-1986-040, :on 860728,main Steam Line Leak Detection Differential Pressure Trip Units Read Downscale.Caused by Misunderstanding of Tech Spec Action Statement.Operators Trained (← links)
- 05000440/LER-1987-052, :on 870703,04 & 05,operators Failed to Place Inoperable Intermediate Range Neutron Monitor (IRM) Channels in Tripped Condition.Caused by Personnel Error.Irm Detectors Replaced.Licensed Operators Will Be Counseled (← links)
- 05000440/LER-1987-050, :on 870704,unexpected Reactor Protection Sys Actuation Occurred Due to Upscale Trip of Neutron Monitoring Sys Intermediate Range Monitor.Caused by Grounding Deficiencies in Plant Ground Grid.Design Change Initiated (← links)
- 05000440/LER-1987-049, :on 870704,false High Pressure Signal Caused Closure of RHR Shutdown Cooling Suction Outboard Containment Isolation Valve.Caused by Procedure Deficiency in Plant Instructions.Instructions Revised & Plant Response Reviewed (← links)
- 05000440/LER-1987-048, :on 870703,containment Fire Hose Reel Inboard/ Outboard Supply Isolation Valves Discovered in Open Position Since 870622.Caused by Procedural Deficiency.Integrated Operating Instructions Will Be Reviewed & Revised (← links)
- 05000440/LER-1987-047, :on 870702,plant Operators Failed to Demonstrate Operability of Offsite Electrical Power Sources within 8 H.Caused by Personnel Error.Personnel Will Receive Training on Correct Tech Spec Interpretation (← links)
- 05000440/LER-1987-046, :on 870701,RWCU Sys Isolation Occurred Due to RWCU HX Room Leak Detection High Temp Signal.Caused by Technician Placing Air Sampler in Manner That Hot Air Blew Over Sensor.Technicians Counseled (← links)
- 05000440/LER-1987-069, :on 870930,unexpected Annulus Exhaust Gas Treatment Sys Train B Auto Start Following Transfer of Operating Trains.Cause Unknown.Repetitive Task Revised to Increase Frequency for Switching Trains to Twice Month (← links)
- 05000440/LER-1987-068, :on 870929,RHR Shutdown Cooling Inboard Isolation Occurred.Caused by Personnel Not Paying Sufficient Attention to Detail to Identify Any Drifting in Pressure Regulator During Performance of Test.Procedures Revised (← links)
- 05000440/LER-1987-045, :on 870630,manual Reactor Scrammed Due to Generator Bushing Failure & Resultant Increased Hydrogen Concentration.Caused by Bushing Sealing Compound Overheating & Melting.Bushings Replaced (← links)
- 05000440/LER-1987-066, :on 870926,Tech Spec 4.8.1.1.2.e.14.a Found Violated.Caused by Discovery of Inadequate Testing of All Divs 1 & 2 Standby Diesel Generator Lockout Features Due to Inadequate Procedures.Procedures Revised & Features Tested (← links)
- 05000440/LER-1987-044, :on 870624 & 28,RCIC Sys Automatically Isolated.Caused by Pressure Oscillations in Rcic/Leak Detection High Flow Instrument Process Lines.Leaking Transmitter Test Connection Repaired (← links)
- 05000440/LER-1987-043, :on 870622,during Annulus Exhaust Gas Treatment Sys (AEGTS) Operability Test,Aegts Exhaust Fan a Started Automatically.Caused by Instrument Drift of AEGTS Exhaust Fan B Differential Pressure Switch.Switch Setpoint Calibr (← links)
- 05000440/LER-1987-042, :on 870617,reactor Protection Sys Electrical Protection Assembly Breaker Tripped,Resulting in Deenergization of Bus A.Caused by Failure of Assembly Logic Card.Card Replaced (← links)
- 05000440/LER-1988-001, :on 880103,reactor Scram Occurred Due to Upscale Trip on intermediate-range Neutron Monitors.Caused by Excessive Feedwater Injection Into Reactor Vessel While Adjusting Potentiometer.Low Speed Stop Lowered (← links)
- 05000440/LER-1987-065, :on 870914,main Steam Drain Line Inboard Isolation Valve Closed Unexpectedly Due to Nssss Isolation Signal During Testing.Caused by Bad Connection in Channel C Isolation Logic (← links)
- 05000440/LER-1987-064, :on 870909,feedwater Pump Overspeed & Change in Feedwater Flow Control Signal Resulted in Reactor Scram,Hpcs Injection & RCIC Initiation.Caused by Procedural Error in Periodic Test Instruction (Pti).Pti Revised (← links)
- 05000440/LER-1987-063, :on 870906,RCIC Sys Isolation Occurred.Cause Undetermined.Engineering Design Change Initiated to Provide Indication of RCIC Trip Delay Status When Taking RCIC Ld Isolation Channels from Bypass to Normal (← links)
- 05000440/LER-1987-062, :on 870828,RHR Head Spray Containment Isolation Valve Energized in Violation of Tech Spec 3.6.4.Caused by Personnel Error.Operator Involved Counseled Re Need for Greater Attention to Detail (← links)
- 05000440/LER-1987-040, :on 870604,RCIC Sys Leak Detection High Steam Flow Trip Unit Noted to Be Reading Downscale.Caused by Steam Condensing in High Side Instrument Process Line of Associated Transmitter (← links)
- 05000440/LER-1987-061, :on 870830,Tech Specs Violated When Inner Air Lock Door Not Maintained Closed W/Outer Air Lock Door Inoperable.Caused by Bushing Failure.Bushing Replaced & Design Change for Air Lock Door Initiated (← links)
- 05000440/LER-1987-060, :on 870822,turbine Bldg/Heater Bay Vent Radiation Monitor Found to Have Been Inoperable for Approx 19 H.Caused by Personnel Error Due to Inattention to Detail. Tagging Error Corrected & Noble Gas Sample Drawn (← links)
- 05000440/LER-1987-059, :on 870821,RWCU Containment Isolation Occurred Due to Indicated High Differential Flow.Caused by Particulate Buildup in Flow Control Valve Positioner Air Flow Restriction Orifice (← links)
- 05000440/LER-1997-008, :on 970807,TS Limit for RCS Heatup/Cooldown Was Not Exceeded Due to Conservative Use of RPV Bottom Head Drain Temperature.Caused by Inadequate Transit Monitoring. Revised Reactor Scram off-normal Instruction (← links)
- 05000440/LER-1997-008-01, Forwards LER 97-008-01,TS Limit Not Exceeded Due to Conservative Use of Reactor Pressure Vessel Bottom Head Drain Temp as Indicator of RCS Heatup/Cooldown Rate.No TS Violation Occurred.Event 32737 Retracted for Listed Reason (← links)
- 05000440/LER-1997-012, :on 970923,reactor Protection Sys Actuation Occurred.Caused by Insufficient Procedural Guidance.Rps Sys Operating Instruction Revised to Include Table/Checklist of Reactor Mode Switch Positions & Effects on RPS Signals (← links)
- 05000440/LER-1997-010, :on 970911,loss of Electrical Power to Reactor Protection Sys Bus Occurred.Caused by Electrical Protective Assembly (EPA) Trip.Replaced EPA Logic Control Board & Associated Molded Case Circuit Breaker (← links)
- 05000440/LER-1997-010-01, Forwards LER 97-010-01 Re Loss of Electrical Power to Reactor Protection Sys Due to Electrical Protective Assembly Trip.Supplemental Rept Submitted to Correct Minor Technical Error in Original Rept (← links)
- 05000440/LER-1999-004, :on 990916,loss of Safety Function Resulted in TS 3.0.3 Entry.Caused by Design Deficiency in Control Complex Architectural Walls.Revised Storm Contingencies Instructions.With (← links)
- 05000440/LER-1987-035, :on 870524,reactor Protection Sys Manual Reactor Scram Initiated in Response to Leak in Condensate Sys.Caused by Excessive Vibration of Condensate Sys.Design Change Under Development (← links)
- 05000440/LER-1986-066, :on 861006,RCIC Sys Isolated During Performance of Main Steam Line Tunnel High Temp Channel Functional Surveillance Test.Cause Undetermined.Rcic Sys Restored to Standby Readiness (← links)
- 05000440/LER-1987-026, :on 870411,unexpected RWCU Containment Isolation Occurred.Caused by Inaccurate Differential Flow Indication at Low RWCU Flow & Low Reactor Pressure Conditions.Bias Signal to Flow Summer Changed (← links)
- 05000440/LER-1986-064, :on 860925,leak Detection Sys Isolation Logic Div 2 for Rwcu,Rcic & RHR Sys Inoperable for Period Exceeding Tech Spec Limit.Caused by Personnel Error. Personnel Counseled (← links)
- 05000440/LER-1986-063, :on 860923,discovered That on 860918,Unit 1 Div 3 125-volt Dc Distribution Bus ED-1-C Disconnected from Unit 1 Div 3 Battery & Normal Charger & cross-connected to Unit 2 Div 3 Battery & Charger.Procedure Revised (← links)
- 05000440/LER-1987-025, :on 870407,outboard Containment Isolation Valves for RHR Sys a Automatically Isolated.Caused by High Pressure Signals from Loose Signal Connection.Single Common Wire Properly Connected to Signal Common Bar (← links)
- 05000440/LER-1987-018, :on 870316,RCIC Sys Isolation Occurred.Cause Related to Use of Ohmmeter to Monitor Status of Initiating Relay Contacts in Surveillance Test Instruction.Plant Administrative Procedure PAP-0205 Revised (← links)
- 05000440/LER-1987-036, :on 870525,rod Pattern Controller Surveillance Missed During Reactor Startup in Violation of Tech Spec. Caused by Personnel Error.Operator Counseled on Need for Attention to Detail (← links)
- 05000440/LER-1987-034, :on 870521,RCIC Isolation Occurred.Cause Related to Use of Ohmmeter to Monitor Status of Initiating Relay Contacts in Surveillance Test Instruction.Plant Administrative Procedure PAP-0205 Revised (← links)
- 05000440/LER-1987-022, :on 870329 & 0407,unexpected Autostarts of Diesel Generator Bldg Ventilation Sys Divs 1 & 2 Occurred. Caused by Incorrect Wiring Configuration & Unadjusted Relay Reset Setpoint.Conditions Corrected (← links)
- 05000440/LER-1987-024, :on 870330,reactor Protection Sys Actuation Occurred Due to Upscale Trip of Neutron Monitoring Sys Intermediate Range Monitor.Caused by Electrical Noise While Maint Outage Work in Progress.Temporary Jumpers Installed (← links)
- 05000440/LER-1987-023, :on 870330,manual Reactor Protection Sys Actuation Initiated Due to Decrease in Reactor Vessel Water Level.Caused by Improper Valve Alignment Between Feedwater & Reactor Water Cleanup Sys.Personnel Retrained (← links)
- 05000440/LER-1987-020, :on 870316,backup Hydrogen Purge Inside Containment Isolation Valve Unexpectedly Isolated Due to Loss of Dc Bus D-1-A.Caused by Personnel Error.Individual Counseled on Need to Exercise Caution Around Switchgear (← links)
- 05000440/LER-1987-019, :on 870317,unexpected RCIC Sys Isolation Occurred When Technicians Connected Test Equipment Prior to Leak Detection Sys Isolation Bypass Switches Placed in Bypass.Caused by Personnel Error.Technicians Counseled (← links)
- 05000440/LER-1987-033, :on 870517,discovered That Performance of Surveillance Instruction Placed Both Trains of Standby Liquid Control Sys in Inoperable Condition.Caused by Inadequate Procedure.Procedure Revised (← links)
- 05000440/LER-1986-086, :on 861126,reactor Scram Occurred Due to Upscale Trip on intermediate-range Neutron Monitors.Caused by Personnel Error & Procedure Deficiency.Instruction Revised & Operators Retrained (← links)
- 05000440/LER-1986-084, :on 861124,personnel Failed to Declare RCIC Sys Containment Isolation Valves Inoperable When Valves Found Closed.Caused by Procedural deficiency.OAP-1702 Will Be Revised to Detail Requirements of Verification Review (← links)
- 05000440/LER-1986-083, :on 861119,reactor Protection Sys Actuation Occurred as Result of Installation of Jumper Across High Pressure Relay.Caused by Deficiency Re Testability of Equipment.Relays Modified & Instruction Revised (← links)
- 05000440/LER-1986-061, :on 860910 & 1002,RWCU Sys Automatically Isolated When Main Steam Line Differential Temp Module Switch Taken to Read. Caused by Fault in Switch Module 1E31-N605A.Temp Switch Modules Scheduled for Replacement (← links)
- 05000440/LER-1986-060, :on 860610,Div 2 Diesel Generator (D/G) Test Reclassified as Valid Test & Failure.Caused by Incorrect Determination of Effect of Previous Maint on Governor Performance.Task Force Established to Monitor D/G Starts (← links)
- 05000440/LER-1987-030, :on 870501,manual Reactor Scram Initiated Due to Loss of Reactor Feedwater.Caused by Failure of Air Lines for Condensate Flow Control Valve from Vibration.Metal Air Lines,Addl Valve & Pipe Supports Will Be Installed (← links)
- 05000440/LER-1987-029, :on 870501,during Containment Venting,Operators Overrode Interlock to Maintain RCIC Suction Transfer W/O Reducing Suppression Pool,Violating Interlock Time Per Tech Spec.Operators Counseled.Design Change Planned (← links)
- 05000440/LER-1986-078, :on 861106,Div 1 4.16-kV Bus EH11 Deenergized, Causing Deenergization of Annulus Exhaust Gas Treatment Sys Train a & Subsequent Actuation of Standby Train B.Caused by Accidental Bumping of Auxiliary Relay (← links)
- 05000440/LER-1986-077, :on 861101,primary Containment Integrity Not Maintained in Support of Maint Work on CRD Mechanisms,Per Tech Spec 3.6.1.1.2.Caused by Personnel Error.Operator Counseled Re Reviewing Work Packages (← links)
- 05000440/LER-1987-032, :on 870509,Div 1 Leak Detection Sys Isolation Signal Resulted in RWCU Sys Outboard Containment Isolation. Caused by Momentary Power Loss.Routine Sys Performance Monitoring Will Continue as Required (← links)
- 05000440/LER-1987-031, :on 870508,Div 3 LOCA Relay Contact Not Tested Per Tech Spec Logic Sys Functional Test Section 4.3.3.2. Caused by Inadequate Surveillance Test Instruction.Tech Spec Logic Sys Functional Test Revised (← links)
- 05000440/LER-1986-052, :on 860826,during Review of Surveillance Test Instructions (Svis),Discovered That Actuation of Isolation Relay Contacts Not Properly Tested.Caused by Inadequate Instructions.Svis Revised & Reperformed (← links)
- 05000440/LER-1986-074, :on 861027,nuclear Steam Supply Shutoff Sys Div 2 balance-of-plant Isolation Occurred When One Leg of Transformer Opened on Transformer Supplying Power for Isolation Actuation Relays (← links)
- 05000440/LER-1986-038, :on 860719 & 20,standby Train of Annulus Exhaust Gas Treatment Sys Automatically Started.Caused by Instrument Inaccuracy & Technician Error.Setpoints Recalculated & Adjusted & Technician Counseled (← links)
- 05000440/LER-1986-037, :on 860719,while in Shutdown Cooling Mode,Rhr Sys Automatically Isolated.Caused by Faulty Leak Detection Switch Modules.Info Tags Hung on Subj Panels Clarified & Faulty Leak Detection Switch Repaired (← links)
- 05000440/LER-1986-036, :on 860718,during Performance of Channel Functional Surveillance Test on Scram Discharge Vol Channel D Level Instrument,Unexpected Full Scram Occurred.Caused by Faulty Auxiliary Contact Mechanism.Mechanism Replaced (← links)
- 05000440/LER-1986-073, :on 861025,both Trains of Control Room Ventilation (HVAC) Sys Shifted Into Emergency Recirculation Mode & Standby Train of Annulus Exhaust Gas Treatment Sys Started.Caused by Inadequate Procedure.Instructions Revised (← links)
- 05000440/LER-1986-072, :on 861025,28 & 29,reactor Protection Sys Alternate Power Supply Tripped,Causing Nuclear Steam Supply Shutoff Sys Outboard Isolation.Caused by Design Deficiency. Regulating Transformers Will Be Installed (← links)
- 05000440/LER-1986-071, :on 861024,transfer of Reactor Protection Sys Bus a from Normal Power Supply to Alternate Supply Resulted in Unexpected balance-of-plant Isolation.Caused by Inadequate Procedure.Sys Operating Instruction Revised (← links)
- 05000440/LER-1987-028, :on 870420,determined That Jet Impingement Effects from Postulated Pipe Break in RHR Steam Line Not Considered in Piping Design Review.Caused by Failure to Follow Procedure.Design Bulletin Issued (← links)
- 05000440/LER-1986-070, :on 861023,drywell Vacuum Relief (DVR) Valve Opened Automatically Due to Increase in Differential Pressure.Caused by Conservative DVR Valve Setpoints.Work Order Initiated to Raise DVR Setpoints (← links)
- 05000440/LER-1986-069, :on 861015,determined That Tech Spec Actions for Operation W/Inoperable Control Rod Not Performed as Required During Plant Operations on 861011-14.Caused by Personnel Error.Rod Control Sys Test Instruction Changed (← links)
- 05000440/LER-1986-068, :on 861014,16 & 22,RWCU Isolations Occurred Due to High Indicated Differential Flow After Design Problems W/Placement of RWCU Blowdown Line Flow Element.Engineering Design Change to Relocate Element Initiated (← links)
- 05000440/LER-1986-067, :on 861014,pressure Transient Occurred within Reactor Vessel Level Instrument Rack.Caused by Technician Inadvertently Opening Isolation Valve During Surveillance Test.Technician Counseled & Seats Replaced (← links)
- 05000440/LER-1987-021, :on 870324,reactorprotection Sys Actuation Occurred Due to Indicated Reactor Vessel Water Level of Level 3.Caused by Procedure Deficiency.Operators Will Receive Training on Vessel Level Fluctuations (← links)
- 05000440/LER-1986-034, :on 860711,RHR Sys a Outboard Containment Isolation Valves Isolated Automatically.Caused by Deenergization of Nuclear Steam Supply Shutoff Sys & Personnel Error.Personnel Counseled on Precaution Measures (← links)
- 05000440/LER-1986-033, :on 860711,while Filling Reactor Vessel Ref Leg,Hpcs Diesel Generator Autostarted on Reactor Vessel Water Level Low Signal.Caused by Instruction Deficiency. Instruction Revised to Change Value Above Trip Setpoint (← links)
- 05000440/LER-1999-003-01, :on 990218,post-accident Dose Limits Were Exceeded.Caused by Relief Valve Leakage Outside of Containment.Removed Relief Valve on 990913,by Design Change Package Implemented Under 10CFR50.59.With (← links)
- 05000440/LER-1997-011, :on 970921,TS Surveillance Test Performance Resulted in Esfas.Caused by Procedure Weakness.Temporarily Revised SVI-B21-T2010 & SVI-B21-T2202 to Allow Completion of Instrument Check Valve Testing (← links)
- 05000440/LER-1986-030, :on 860630,one Vacuum Relief Valve in Containment Vacuum Relief Sys Opened Due to Vacuum Caused by Operation of Containment Vessel & Drywell Purge Sys.Caused by Equipment Malfunction.Valve Replaced (← links)
- 05000440/LER-1986-025, :on 860617,containment Vacuum Relief Sys Valves Opened While Containment Vessel & Drywell Purge Sys Running in Refuel Mode.Caused by Design Problem in Sys (← links)
- 05000440/LER-1986-082, :on 861112,both Diesel Generator Bldg Ventilation Supply Sys Fans for Div 1 Diesel Generator auto-started Unexpectedly.Caused by Control Tachometer Problem.Engineering Design Change Initiated (← links)
- 05000440/LER-1986-081, :on 861111,unexpected Main Steam Line Isolation Occurred During Performance of Surveillance Instruction (SVI)-C71-T0047.Caused by Deficiency in Surveillance Instruction.Instruction Revised (← links)
- 05000440/LER-1986-080, :on 861108 & 26,during Local Leak Rate Test Surveillances,Total Combined Allowable Primary Containment &/Or Secondary Containment Bypass Leakage Rates Exceeded Tech Spec 3.6.1.2.Caused by Failed Seats & Resilient Seal (← links)
- 05000440/LER-1986-079, :on 861109,Train B of Control Room HVAC Sys Started Unexpectedly in Emergency Recirculation Mode During Performance of Special Test Instruction.Caused by Procedural Deficiency (← links)
- 05000440/LER-1987-004, :on 870127,unexpected Reactor Protection Sys Actuation Occurred Due to Upscale Trips on Intermediate Range Neutron Monitors.Caused by Personnel Error.Warning Sign Will Be Posted & Individuals Counseled (← links)
- 05000440/LER-1986-007, :on 860414,RWCU Sys Outboard Containment Isolation Valve Rendered Inoperable by Removing Jumper Supplying Power to Closing Circuit.Caused by Use of Out of Date Drawing.Procedure Revised to Clarify Review (← links)
- 05000440/LER-1986-062, :on 860916,drywell Vacuum Relief Valve Opened Automatically.Caused by Conservative Drywell Valve Relief Sys Relief Valve Setpoints.Drywell Valve Relief Actuation Setpoints Raised (← links)
- 05000440/LER-1986-013, :on 860512,standby Train of Annulus Exhaust Train Gas Treatment Sys Actuated When Operating Train Experienced Loss of Power Due to Deenergization of Div 2 Load Ctr.Caused by Faulty Ground.Relay Replaced (← links)
- 05000440/LER-1986-012, :on 860508,neutron Monitoring Sys intermediate- Range Monitor Instruments C & G Declared Inoperable,Due to Overdue Surveillance.Caused by Misunderstanding by Shift Technical Advisor.Addl Training Will Be Required (← links)
- 05000440/LER-1997-009, :on 970819,automatic Actuation of ESF Occurred. Caused by Personnel Error.Individual Involved Counseled to Address Deficient Work Practices (← links)
- 05000440/LER-1997-007, :on 970713,loss of Electrical Power to Reactor Protection Sys Bus Occurred Due to Electrical Protective Assembly Trip.Trip Resulted in Esfas.Caused by Unreliable Operation of Control Board.Performed Review (← links)
- 05000440/LER-1987-001, :on 870107,RWCU Containment Isolation Occurred Due to Indicated High Differential Flow.Caused by Flow Control Valve Problems.Engineering Design Change Implemented to Provide Mass & Temp Compensation for RWCU Instruments (← links)
- 05000440/LER-1986-051, :on 860818,discovered That RHR Containment Upper Pool Cooling Isolation Valves Did Not Receive Reactor Vessel High Pressure Isolation Signal as Stated in FSAR Table 6.2-32.Surveillance Instruction Revised (← links)
- 05000440/LER-1986-049, :on 860818 & 19,gaseous Effluent Vent Stack Flow Estimates Not Performed Once Per 4 H as Required by Tech Specs.Caused by Personnel Error.Operators Counseled & Administrative Procedures Revised (← links)
- 05000440/LER-1986-048, :on 860819 & 20,unexpected RHR Sys Isolations Occurred During Performance of Maint Retest.Caused by Inadequate Surveillance Test Instruction (Svi) & Poor Jumper Connection,Respectively.Svi Revised (← links)
- 05000440/LER-1986-047, :on 860816,Train a of Control Room HVAC Sys Started in Emergency Recirculation Mode During Surveillance Test.Caused by Diesel Generator Exhaust Tripping Ethylene Oxide Monitor.Surveillance Instructions Being Revised (← links)
- 05000440/LER-1986-019-01, :on 860530,autostart of Div 2 Diesel Generator Bldg Ventilation Supply Fan Discovered.Caused by Intermittent Signals Generated from Diesel Generator Control Tachometer Due to Sys Noise (← links)
- 05000440/LER-1986-046, :on 860813 & 14,independent Sample Analysis & Release Rate Calculation/Discharge Line Valving Verifications Not Performed Prior to Commencing Liquid Radwaste Batch Discharge Releases.Caused by Personnel Error (← links)
- 05000440/LER-1986-044, :on 860806,electrical Protection Assembly (EPA) Tripped.Caused by Failure of Capacitors in GE EPA Electronic Process Control (Pc) Board.Replacement of EPA Pc Boards Underway (← links)
- 05000440/LER-1986-042, :on 860801 & 19,diesel Generator Bldg Ventilation Sys Supply Fan Autostarted.Caused by Intermittent Signals Generated from Control Tachometer Due to Sys Noise.Tachometers Replaced (← links)
- 05000440/LER-1986-041, :on 860731,div 3 Diesel Generator & HPCS Pump Autostarted.Caused by Fluctuations in Output of Reserve Charger.Amplifier Card Replaced.Design Mod to Install Filter Network in Battery Charger Output Circuit Being Processed (← links)
- 05000440/LER-1986-093, :on 861229,plant Placed Into Operational Condition 1 When Containment Vacuum Breaker Opened.Caused by Personnel Error.Individuals Counseled Re Responsibility to Initiate Limiting Condition for Operation (← links)
- 05000440/LER-1986-091, :on 861228,nuclear Steam Supply Shutoff Sys Div 2 balance-of-plant Isolation Occurred When Power Supply Breaker for Isolation Actuation Relays Inadvertently Opened. Caused by Personnel Error.Maint Personnel Counseled (← links)
- 05000440/LER-1986-092, :on 861230,reactor Shutdown Conducted to Comply W/Tech Spec 3.4.4,due to High Reactor Coolant Conductivity. Caused by Failure of Three Main Condenser Tubes.Leakage & Damaged Tubes Plugged & Loose Lagging Removed (← links)
- 05000440/LER-1987-007, :on 870213,pressure Transient Occurred within Reactor Vessel Level Instrument Rack Resulting in Redundant Reactivity Control Sys (RRCS) Alternate Rod Insertion.Caused by Design Configurations of RRCS Instruments (← links)
- 05000440/LER-1987-006, :on 870208,unexpected RCIC Sys Isolation Occurred Due to Indicated Min Differential Pressure from Leak Detection Sys.Caused by Steam Condensing in High Side Process Connection for Instrument Impulse Line (← links)
- 05000440/LER-1987-005, :on 870207,unexpected Reactor Protection Sys Actuation Occurred During Performance of APRM Surveillance Test Instruction (Svi).Caused by Deficient Svi.Svi Revised to Delete Step 5.1.61 (← links)
- 05000440/LER-1986-090, :on 861225,one Standby Liquid Control Sys Train Inoperable,Violating Tech Spec 3.0.4.Caused by Work Package Deficiency Due to Personnel Error.Personnel Counseled & Training Initiated (← links)
- 05000440/LER-1988-036, :on 880917,Channels B & D of MSIV Low Condenser Vacuum Isolation Instrumentation Declared Inoperable.Caused by Debris/Water Intrusion Into Instrument Lines.Instrument Lines Will Be Cleared on Monthly Basis (← links)
- 05000440/LER-1988-035, :on 880914,primary Containment Integrity Was Compromised for 30 in That Upper Containment Airlock Inner Door Seals Were Deflated W/Outer Door Open.Caused by Failure of Door Interlock.Engineering Evaluation Initiated (← links)
- 05000440/LER-1986-089, :on 861216,RCIC Sys Isolation Occurred.Caused by Failure of Personnel to Review Electrical Diagrams Prior to Restoring Bypass Switches to Normal Position.Personnel Counseled & Training Conducted (← links)
- 05000440/LER-1986-029, :on 860627,annulus Exhaust Gas Treatment Sys B Exhaust Fan Automatically Started Due to False Low Flow Signal from Train A.Caused by Personnel Error During Maint. Technicians Counseled (← links)
- 05000440/LER-1986-028, :on 860627,reactor Protection Sys Actuation Occurred Due to Low Reactor Vessel Water Level When Reactor Recirculation Sys Pump B Started.Caused by Deficient Test Instruction.Test Instruction Changed (← links)
- 05000440/LER-1986-088, :on 861209,RHR Shutdown Cooling Isolated During Performance of Surveillance Test Instruction.Caused by Deficiency Involving Equipment Testability.Technicians Counseled on Careful Installation Practices (← links)
- 05000440/LER-1986-026, :on 860618,containment Isolation Valves Closed. Caused by Technician Inadvertently Grounding Power Lead During pre-operational Test.Technician Counseled.Testing Instructions to Include Caution Note (← links)
- 05000440/LER-1986-020, :on 860531,backup Hydrogen Purge Isolation Valves Autoclosed After Deenergization of Drywell Radiation Monitors.Caused by Personnel Error.Appropriate Operations Shift Personnel Will Receive Retraining (← links)
- 05000440/LER-1986-019, :on 860530,Div 2 Diesel Generator Bldg Ventilation Supply Fan Discovered to Be Running Unexpectedly.Cause Unknown.Investigation Continuing W/ Attempt to Replicate Conditions Prior to & Including Event (← links)
- 05000440/LER-1986-017, :on 860529,reactor Protection Sys Actuated. Caused by Personnel Error While Performing Pressure Test on Sensing Line of First Stage Pressure Transmitters.Procedure for Isolation Instruments Revised (← links)
- 05000440/LER-1986-016, :on 860526,spike from RWCU Pump Room B High Differential Temp Switch Caused Inboard Containment Isolation Valves Isolation.Caused by Faulty Switch.Switch Modules Replaced (← links)
- 05000440/LER-1988-043, :on 881030,HPCS Pump Room Cooler Inadvertently Started During Performance of Breaker Retest.Caused by Procedural Deficiency.Retest Guidelines Will Be Added to Generic Electrical Instructions for Maint (← links)
- 05000440/LER-1986-015, :on 860520,reactor Protection Sys (RPS) Actuation Occurred Due to High Scram Discharge Instrument Vol Level Trip.Caused by Personnel Error.Rps Trip Reset & Air Supply Restored to Scram Pilot Air Header (← links)
- 05000440/LER-1987-017, :on 870314,Tech Spec 3.6.1.3 Violated Due to Loss of Primary Containment Integrity.Caused by Leaking Valve in Upper Airlock Inner Door & Unauthorized Access of Individual Through Airlock.Security Instructed (← links)
- 05000440/LER-1987-015, :on 870307,deenergization of Isolation Relays W/Containment Vent Exhaust Plenum Resulted in Closure of Containment Vessel Valves.Caused by Inadequate Surveillance & Work Order Preparation.Surveillance Instructions Revised (← links)
- 05000440/LER-1987-016, :on 870309,partial Nuclear Steam Supply Shutoff Sys Div 2 balance-of-plant Isolation Occurred During Surveillance Test Instruction.Caused by Deficiency Involving Equipment Testability.Technicians Counseled (← links)
- 05000440/LER-1999-002-01, :on 990327,RHR a Pump Failed to Start & LCO 3.0.3 Was Entered Due to TS Bases Misinterpretation.Caused by Failed Optical Isolator That Provided Signal to Pump Start Permissive Circuitry.Subject Circuitry Was Replaced (← links)
- 05000440/LER-1988-041, :on 881013,RCIC Sys Inboard Containment Isolation Occurred Due to Leak Detection (Ld) Transmitter Failure.Caused by Internal Short Circuit Between Ctr Diaphragm & Low Side Capacitor Plate.Evaluation Underway (← links)
- 05000440/LER-1987-014, :on 870305,pressure Transient in Reactor Vessel Level Instrument Rack Initiated Hpcs.Caused by Use of Incorrect Valving Sequence When Restoring Level Transmitter to Svc.Instrument Rack Tasks Rescheduled (← links)
- 05000440/LER-1999-001-01, :on 990317,discovered That Control Complex Bldg Architectural Walls Were Not Included in Tornado Dp Loading Design.Caused by Failure to Consider Tornado Dp Loads. Compensatory Measures Were Implemented.With (← links)
- 05000440/LER-1988-040, :on 881007,train B of Control Room HVAC Sys Inoperable for Emergency Recirculation Mode W/Train a out-of-svc for Planned Maint.Caused by Degradation of Wire Insulation.Control Wiring & Actuator Replaced (← links)
- 05000440/LER-1987-012, :on 870302,reactor Scram,Due to Reactor Vessel Level Less than Level 3 & NSSS balance-of-plant & RWCU Isolations,Occurred.Caused by Personnel Inadvertently Actuating lo-lo Switch 1N21-N335.Personnel Disciplined (← links)
- 05000440/LER-1988-039, :on 880928,RWCU Sys Containment Isolation Occurred During Plant Startup When Feedwater Flow to Reactor Initiated.Caused by Indicated High Differential Flow.Design Change to Replace RWCU Initiated (← links)
- 05000440/LER-1986-035, :on 860714,RWCU Sys Automatically Isolated While Discharging Water to Main Condenser During Normal Operation.Caused by Technician Inadvertently Skipping Surveillance Instruction Step (← links)
- 05000440/LER-1987-011, :on 870227,during Audit,Discovered That on 861021,independent Verification of Discharge Path Valve Line Not Performed Prior to Commencing Liquid Radwaste Discharge Release.Caused by Failure to Follow Procedure (← links)
- 05000440/LER-1988-038, :on 880911,control Rods Inserted in Violation of Tech Spec 3.1.4.2, Reactivity Control Sys. Caused by Procedural Deficiency.Integrated Operating Instruction Revised & Event Reviewed During Training (← links)
- 05000440/LER-1987-008, :on 870218,div 1,class 1E 125 Volt Dc Battery Failed to Meet Allowable Electrolyte Temp of 72 F.Caused by Personnel Error & Faulty Thermostat.Procedure Reviewed & Thermostat Replaced (← links)
- 05000440/LER-1986-003, :on 860403,RWCU Sys Outboard Containment Isolation Occurred.Caused by Technician Touching Lifted Wire to Relay Housing During Surveillance Test.Engineering Design Change Planned (← links)
- 05000440/LER-1986-057, :on 860903,containment Isolation Valves Not Deactivated in Closed Position.Caused by Failure of Nonconformance Rept Program to Require Routing of Environ Qualification Deficiencies to Control Room.Program Revised (← links)
- 05000440/LER-1986-056, :on 860902 & 29,RWCU Containment Isolations Occurred.Caused by Flow Control Valve Problems,Placement of Blowdown Flow Element & Insufficient Operating Instructions. Design Changes Initiated.Instructions Will Be Revised (← links)
- 05000440/LER-1986-055, :on 860902,reactor Scram Occurred.Caused by Sudden Increase in Sensed Pressure for Steam Bypass Valves Controller.Pressure Regulators & Instrumentation Valve Lineups Recalibr,Procedures Revised & Mgt Directive Issued (← links)
- 05000440/LER-1986-054, :on 860902,07,11,13,15 & 19,RCIC Isolations Occurred.Caused by Instrument Isolation Valve Failure & Impulse Line Slope Problems,Leak Detection Response Time & Personnel Error.Valves Repaired or Replaced (← links)
- 05000440/LER-1986-053, :on 860901,containment & Drywell Vacuum Breakers Discovered Open.Caused by Procedural Error. Integrated Operating Instruction for Cold Startup Revised. Control Room Operators Counseled (← links)
- 05000440/LER-1986-039-01, Forwards LERs 86-053-00,86-054-00,86-055-00,86-056-00, 86-057-00 & 86-039-01.LER 86-039-01 Provides Addl Info Re Corrective Actions (← links)
- 05000440/LER-1986-058, :on 860906,unit Placed in Operational Condition 2 While Surveillance Test in Progress,Placing Instrumentation in Inoperable Condition.Caused by Procedural Deficiency.Procedure OAP-1701 Revised (← links)
- 05000440/LER-1986-027, :on 860626,ESF Actuation Occurred During Installation of RWCU Design Change.Caused by Personnel Error.Program Interfaces Between Design & Work Control Processes Reviewed & Personnel Trained (← links)
- 05000440/LER-1986-023, :on 860611,three Emergency Recirculation Actuations Occurred.Caused by Technicians Error & Chlorine Monitor Fault Trip.Emergency Actuation Logic for Monitors Altered (← links)
- 05000440/LER-1986-024, :on 860612,gaseous Effluent Noble Gas Grab Sample Not Collected & Analyzed.Caused by Inadequate Knowledge of Radiological Effluent Tech Specs & Poor Communications.Chemistry Personnel Will Receive Training (← links)
- 05000440/LER-1986-022, :on 860609,two Surveillance Tests of Rod Pattern Control Sys Not Performed at Required Interval. Caused by Inadequate Means of Tracking Performance of Instrument & Control Daily Surveillances (← links)
- 05000440/LER-1986-021, :on 860602,discovered That Five Recirculation Damper Actuators in Diesel Generator Bldg Ventilation Sys Inoperable Due to Seal Failures.Caused by Expiration of Seal Life & Improper Storage & Maint.Seals Replaced (← links)
- 05000440/LER-1997-015, :on 971019,failure of Containment Penetration Leak Rate Test Was Noted.Caused by Failures of Valves to Maintain Test Pressure.Valve Body Seat Was Machined & Lapped to Achieve Proper Finish (← links)
- 05000440/LER-1997-017, :on 970715,HPCS Suppression Pool Water level- High Logic Actuation Occurred.Caused by Incomplete Assessment of Suppression Pool Level Instrumentation Channels.Discussed Event W/Sros Involved (← links)
- 05000440/LER-1997-014, :on 971014,inoperable CR Was Partially Withdrawn from Reactor Core & Reinserted During CR Testing. Caused by RO Not Appropriately Questioning CR Operability. Both Day & Nightshifts Were Coached (← links)
- 05000440/LER-1997-013, :on 971009,control Rod Drive Hydraulic Sys Maintenance Activities Resulted in Reactor Protection Sys Actuation.Caused by Personnel Error.Sro Responsible for Clearance of Tagout Was Counseled (← links)
- 05000440/LER-1986-011, :on 860503-05 & 0516-17,gaseous Effluent Vent Stack Flow Estimates Not Performed Every 4 H.Caused by Personnel Error.Personnel Will Be Trained & Counseled (← links)
- 05000440/LER-1986-009, :on 860504,RWCU Sys Outboard Containment Isolation Occurred.Caused by Personnel Error Due to Cramped Working Location.Engineering Design Change Developed to Alter Wiring Configuration (← links)
- 05000440/LER-1997-016, :on 971219,vibration-induced Turbine electro- Hydraulic Control Sys Fluid Leak Resulted in Reactor Protection Sys & Esf.Caused by vibration-induced Fatigue Failure.Ehc Tubing Compression Fittings,Replaced (← links)
- 05000440/LER-1986-005, :on 860421,0510,17 & 19,control Room HVAC Sys Shifted to Emergency Recirculation Mode Due to High Chlorine Gas Monitor Trip Signal.Caused by Defective Optical Lamp Filament.Lamp Replaced (← links)
- 05000440/LER-1986-004, :on 860413,limiting Condition for Operation Occurred When Containment/Drywell Purge Sys Not Secured Per Tech Specs When Vent Radiation Monitor Deenergized.Caused by Operator Error & Erroneous Task Card (← links)
- 05000440/LER-1990-030, :on 901011,failure to Perform Required Surveillance Prior to Resuming Fuel Movement Discovered (← links)
- 05000440/LER-1986-065, :on 860930,control Rod Movements Performed While Rod 30-27 Bypassed in Rod Action Control Sys W/O Being Electrically or Hydraulically Disarmed,Violating Tech Specs. Caused by Personnel Error.Training Provided (← links)
- 05000440/LER-1988-021, :on 880606,reactor Protection Sys Distribution Bus a Inadvertently Deenergized.Caused by Personnel Error. Operator Counseled & Disciplinary Action Taken to Sharpen Awareness & Increase Attention to Detail (← links)
- 05000440/LER-1988-020, :on 880605,reactor Scram Occurred Due to High APRM Neutron Flux Levels.Caused by Personnel Error.Automatic Mode of Flux Control Disabled Until Adjustments Completed & Personnel Involved Disciplined (← links)
- 05000440/LER-1988-042, :on 881021,reactor Protection Sys Actuation Occurred Due to APRM Channel Exceeding Neutron flux-high Setdown Trip Setpoint.Caused by Local Power Range Monitor Failure.Failed Channel Removed from Svc (← links)
- 05000440/LER-1986-008, :on 860430,containment Fire Hose Reel Inboard/ Outboard Supply Isolation Valves Discovered in Open Position.Valves Opened Before Start of Core Alterations on 860321 by Shift Operators.Personnel Counseled (← links)
- 05000440/LER-1986-006, :on 860422 & 25,neutron Monitoring Sys Instrumentation Upscale Trips Resulted in One Manual & One Automatic Reactor Protection Sys Actuation.Spikes Caused by Electrical Noise.Bus Changes Implemented (← links)
- 05000440/LER-1986-002, :on 860329,Div II Redundant Reactivity Control Sys Channels a & B Alternate Rod Insertion Actuation Resulted in Scram Discharge Instrument Vol High Level Trip of Reactor Protection Sys (← links)
- 05000440/LER-1988-019, :on 880515,trains of Control Room Heating, Ventilation & Air Conditioning Declared Inoperable for Emergency Circulation Mode.Caused by Mechanical Failure of Compressor Guide Vane Linkage Connector (← links)
- 05000440/LER-1988-034, :on 880903,unexpected Automatic Start of Div 1 Diesel Generator Bldg Ventilation Sys Occurred.Caused by Failure of 125/24-volt Dc Converter in Control Circuitry. Converter Replaced & Retests Satisfactorily Performed (← links)
- 05000440/LER-1988-018, :on 880505,investigation Determined That Elevation Changes Performed in Apr 1987 Failed to Result in Corrections to Test Instructions of Instrument Recalibrs. Caused by Personnel Error.Surveillance Instruction Revised (← links)
- 05000440/LER-1988-016, :on 880504,unexpected RWCU Containment Isolation Occurred Due to Pump Room High Differential Temp. Caused by Personnel Error.Caution Added to Repetitive Task for Calibr of Time Delay for Fan a Trip Relay (← links)
- 05000440/LER-1988-033, :on 880901,RCIC Sys Inboard Containment Isolation Occurred.Caused by Leak Detection Transmitter Failure Due to Internal Short Circuit Between Diaphragm & Capacitor Plate.Transmitter Replaced (← links)
- 05000440/LER-1988-015, :on 880430,reactor Scram Occurred Due to Reactor Water Level of Less than Level 3.Caused by Procedural Deficiency.Operating Procedure Revised,Operators Involved Counseled & Operators Trained Re Events Sequence (← links)
- 05000440/LER-1988-014, :on 880428,reactor Protection Sys (RPS) Actuation Occurred on Reactor Vessel High Level.Caused by Failure of Contacts to Close in Bypass Relay for RPS Channel A.Relay Replaced & Tested & Old Relay Returned for Analysis (← links)
- 05000440/LER-1988-013, :on 880427,RWCU Sys Containment Isolation Occurred.Caused by Increase in Differential Flow Trip Setpoint &/Or Time Delay.Condition Under Evaluation & RWCU Flow Control Valves Engineering Design Change Initiated (← links)
- 05000440/LER-1988-012, :on 880427,automatic Reactor Scram Occurred Due to Reactor Water Level of Less than Level 3.Caused by Personnel Error & Procedural Inadequacy.Operators Involved Counseled & Sys Operating Instructions Revised (← links)
- 05000440/LER-1988-032, :on 880826,failure of Ball Valve & Door Seal Result in Inoperable Containment Airlock Doors & Momentary Loss of Containment Integrity While Technician Exits Containment.Work Orders Will Be Initiated (← links)
- 05000440/LER-1988-031, :on 880220,quarterly Surveillance Instruction Removing Water from Div 2 & 3 Fuel Oil Storage Tanks Missed. Caused by Personnel Error.Procedure Will Be Changed to Enhance Communications Between Reviewers & Coordinators (← links)
- 05000440/LER-1988-030, :on 880823,offgas Pretreatment Sample Not Taken & Analyzed,Per Tech Spec 3.3.7.1.Caused by Personnel Error. Procedure Change Requiring Technicians to Review Daily Limiting Condition for Operations Implemented (← links)
- 05000440/LER-1988-029, :on 880812,standby Liquid Control Pump B Suctional Manual Isolation Valve Inadvertently Left Closed Resulting in Trains Being Inoperable.Caused by Personnel Error.Counseling Session Will Be Held (← links)
- 05000440/LER-1988-011, :on 880404,Train 1A of Diesel Generator Bldg Ventilation Sys for Diesel Generator Unexpectedly Started. Caused by Momentary Decrease in Control Tachometer Indication.Extensive Troubleshooting Performed (← links)
- 05000440/LER-1988-028, :on 880623,trains of Control HVAC Shifted Into Emergency Recirculation Mode Due to High Toxic Gas Signals. Caused by Heavy Black Smoke Exhausting from Auxiliary Boiler.Affected Ethylene Oxide Detectors Recalibr (← links)
- 05000440/LER-1988-026, :on 880623,reactor Scram Occurred Due to Unexpected Turbine Trip.Caused by Mechanical Failure of Trip Latch Assembly.Defective Parts Replaced & Proper Clearances within Mechanism Established by Machining Various Surfaces (← links)
- 05000440/LER-1988-010, :on 880310 & 11,RWCU Containment Isolations Occurred Due to Pump Room High Differential Temp.Caused by Inadequate Instructions.Roughing Filters in HVAC Sys AB Replaced (← links)
- 05000440/LER-1988-024, :on 880616,spurious Spike in Recirculation Flow Demand Caused Increased Core Flow Resulting in Upscale Neutron Flux Trip & Subsequent Reactor Scram.Caused by Reinsertion of Automatic Flux Control Card (← links)
- 05000440/LER-1988-025, :on 880618,overtravel of Reactor Protection Sys (RPS) Power Transfer Switch Occurred,Resulting in Loss of Power to Both Busses & Full RPS Actuation.Caused by Personnel Error.Info Tag Installed & Design Change Planned (← links)
- 05000440/LER-1988-006, :on 880119,reactor Protection Sys (RPS) B Motor Generator Set Output Circuit Breaker Tripped Open on Overvoltage,Resulting in Div II balance-of-plant Isolation. Caused by Small Random Disturbances in RPS Bus Voltage (← links)
- 05000440/LER-1988-023, :on 880608 & 871027,reactor Scram & Containment Isolation Occurred on Loss of Electrical Distribution Busses Due to Inadvertent Breaker Operation.Caused by Personnel Error.Operator Counseled & Disciplinary Action Taken (← links)
- 05000440/LER-1988-022, :on 880607,0226 & 0530,Tech Specs Violated When Operation Change Completed Prior to Meeting All Applicable Tech Specs Surveillance Requirements.Caused by Personnel Error.Licensed Operators Will Be Trained in Event (← links)
- 05000440/LER-1988-008, :on 880123,unexpected Partial Div 2 NSSS Balance of Plant Isolation Occurred.Caused by Deficiency Involving Testability of Equipment.Review of Surveillance Instructions Performed (← links)
- 05000440/LER-1988-007, :on 880122,reactor Protection Sys Actuation Occurred Due to High Scram Discharge Vol Level.Caused by Personnel Error.Personnel Involved Counseled on Need to Perform More Thorough Review (← links)
- 05000440/LER-1988-005, :on 880107,reactor Protection Sys Bus Power Supply Transfer Resulted in RHR Shutdown Cooling Isolation. Caused by Personnel Error.Operating Personnel Counseled & Plant Instructions Will Be Enhanced (← links)
- 05000440/LER-1988-009, :on 880227,APRM Readings Misadjusted During Channel Calibr Surveillance Instruction.Caused by Error in Heat Balance Calculation.Surveillance Instruction Revised to Include Check of Heat Balance Calculation (← links)
- 05000440/LER-1987-077, :on 871216,control Room Operators Failed to Demonstrate Operability of Required Offsite Electrical Power Sources within Tech Spec Limits.Caused by Personnel Error.Personnel Disciplined (← links)
- 05000440/LER-1997-004, :on 970516,invalid High Suppression Pool Level Signal Resulted in ESF Actuation.Caused by Procedural Weakness.Appropriate Administrative Guidance Will Be Revised (← links)
- 05000440/LER-1997-003, :on 970322,loss Electrical Power to RPS Bus Due to Electrical Protective Assembly Trip Results in Esfa. Caused by Random Failure of Associated Logic Control Board. Logic Control Board Replaced W/Group 9 Board (← links)
- 05000440/LER-1997-002, :on 970211,breaker Trip Caused Loss of Electrical Power to Non-Class 1E Bus & Resulted in ESF Actuation.Caused by Random Component Failure.Ground Fault Replaced (← links)
- 05000440/LER-1996-006, :on 960718,MOV Control Circuitry Design Deficiency Resulted in Fire Protection Violation.Fire Impairment Was Issued for Control Room Fire Protection Features & Addl MOVs Considered for Mod (← links)
- 05000440/LER-1996-008, :on 961004,degraded Breaker Results in Loss of Safety Function & Exceeding TS Action Statements.Caused by Sensor Leads Installed Backwards.Circuit Breaker EF-1-D-09 Replaced (← links)
- 05000440/LER-1997-001, :on 970107,nonlicensed Operator Electrical Switching Error Results in Reactor Protection Sys & Other ESF Actuations Occurred.Caused by Personnel Error.Standing Instruction Issued & Procedures Enhanced (← links)
- 05000440/LER-1993-002, :on 930109,secondary Containment Bypass Leakage Exceeded Limitations Stated in TS 3.6.1.2.d,resulting in Entry Into TS 3.0.3.Caused by Improper Stroke Adjustment. Minor Adjustment Made to Valve Travel (← links)
- 05000440/LER-1993-001, :on 930109,RWCU Isolation Occurred as Result of High Differential Flow.Caused by Design Deficiency Associated W/Sys Voiding Phenomenon.Operators Currently Being Retrained & TS Change Request Submitted (← links)
- 05000440/LER-1992-022, :on 921105,TS 3.0.3 Limits for Secondary Bypass Leakage Exeeded Due to Failure of LLRT Surveillance Results. Caused by Component Malfunctioning.All Licensed Personnel Will Be Trained Re TS Action Requirements (← links)
- 05000440/LER-1992-021, :on 921101,discovered That APRM Gain & Channel Calibration Had Not Been Calibrated Per TS 3.3.1.Caused by Multiple Personnel Error.Lco Tracking Sys Will Be Covered in Licensed Operator Requalification Training (← links)
- 05000440/LER-1992-020, :on 921023,inadequate Reset of Containment Air Lock Door Discovered Resulting in TS Violations.Caused by Drawing Discrepancy.Piping Sys Diagram Being Revised to Properly Identify Pressure Switches (← links)
- 05000440/LER-1992-005, :on 920326 & 0421,four Containment Penetrations Exceeding Local Leak Rate Test Failure Criteria.Caused by Component Failure.Differently Designed Spring Loaded Lift Check Valve Installed (← links)
- 05000440/LER-1992-024, :on 921121,two SRVs Unexpectedly Opened During Maint/Surveillance Activity,Introducing Pressure Transient Which Caused Reactor Thermal Power to Increase.Cause Not Determined.Two Slave Trip Units Replaced (← links)
- 05000440/LER-1992-023, :on 921110,discovered Mispositioned Instrument Isolation Valve for Containment Atmosphere Monitoring Sys Pressure Transmitter.Caused by Inadequate Surveillance Instruction.Instruction Revised (← links)
- 05000440/LER-1992-016-05, :on 920906,identified That Fhb HVAC Supply Fan B Tripped Due to Instrumentation Drift of Differential Pressure Switch.Caused by Equipment Failure.Fhb Exhaust Switches Will Be Shortened from 24 to 3 Months (← links)
- 05000440/LER-1992-019, :on 921009,valve Positioning Error Resulted in Inoperability of Both SLCS Trains.Caused by Personnel Error. Operator Responsible for Valve Positioning Error Counseled Re Event (← links)
- 05000440/LER-1992-018, :on 920708,hourly Fire Watch of Inoperable Fire Barriers Not Performed as Required.Caused by Personnel Error.Counseling & Disciplinary Action Administered (← links)
- 05000440/LER-1992-017, :on 920910,RPS Scram Occurred Due to Reactor Water Level Reaching Level 3 Setpoint of 178 Inches.Oil Filter Gasket for RFPT B Servo Valve Inspected & Replaced.W/ (← links)
- 05000440/LER-1992-006, :on 920328-29,local Leak Rate Test Results Exceeded Primary Containment Leakage of Main Steam Lines A,B & D.Caused by Excessive Buildup from Oxide.Mods to Improve Seating Characteristics Discussed (← links)
- 05000440/LER-1992-015, :on 920701,HPCS Sys Declared Inoperable Due to Inoperability of Suppression Pool Suction Valve.Daily Instruction Written to Remind Personnel to Hold Control Switch in Appropriate Position (← links)
- 05000440/LER-1996-007, :on 960821,missed Surveillance Occurred.Caused by Weakness in Design Mod Process.Revised Design Mod Process to Provide Detailed Requirements (← links)
- 05000440/LER-1996-005, :on 960530,automatic Reactor Scram Occurred. Caused by Auxiliary Transformer Failure.Replaced Failed Auxiliary & Load Center Transformers (← links)
- 05000440/LER-1996-003, :on 960429,diesel Generator Tech Spec Action Statement Time Limit Exceeded.Caused by Personel Error.Ts Required Actions Completed & DG Restored to Operable Status (← links)
- 05000440/LER-1996-004, :on 960502,maintenance Under Inadequate Tagout Resulted in Partial ESF Actuation.Caused by Personnel Errors.Personnel Responsible Will Be Retrained (← links)
- 05000440/LER-2020-001, Combustible Gas Mixing Compressor Was Declared Inoperable Due to Degraded Thermal Overloads Resulting in Technical Specification Violation (← links)
- 05000440/LER-1992-014, :on 920603,steam Supply Pressure Low Isolation Signal & Associated RCIC Sys Isolation Were Initiated.Caused by Procedure Deficiency.Surveillance Instruction ISI-B21-T1300-1 Revised (← links)
- 05000440/LER-1996-002, :on 960218,partial Actuation of HPCS Sys Occurred.Caused by Inverter Circuitry Failure.Inverter Refurbished W/Replacement Electrolytic Capacitors,Bench Tested & Returned to Svc (← links)
- 05000440/LER-1992-011, :on 920503,two IRM Channels Became Inoperable Due to Failure to Complete TS 3.3.1 Surveillance Requirements.Caused by Personnel Error.Plant Licensed Operators Will Be Instructed on Lessons Learned (← links)
- 05000440/LER-1992-010, :on 920430,inadvertent Outboard Balance of Plant Containment Isolation Occurred.Caused by Inadequate Work Order.Personnel Assisted in Investigation & Have Been Made Aware of Errors (← links)
- 05000440/LER-1991-024, :on 911204,loss of Emergency Svc Water Sys Loop Occurred Due to Inadvertent Isolation of Keepfill Sys.Caused by Personnel Error.Valve 1P45-F720A Required Valve Position Changed to Locked Open (← links)
- 05000440/LER-1996-001, :on 960209,CR Emergency Recirculation Sys TS Time Limit Exceeded Due to Personnel Error.Shift Supervisor & Unit Supervisor Counseled.Licensed Operators & STAs Will Be Trained on Lessons Learned from Event (← links)
- 05000440/LER-1995-007, :on 950902,reactor Automatically Scramed.Caused by Operator Error.Operators Involved in Event Removed from Licensed Duties & Counseled W/Respect to Improper Actions (← links)
- 05000440/LER-1995-006, :on 950901,ESF Actuation During Inverter Restoration Occurred.Caused by Personnel Error.Engineers Involved in Technical Review of Work Order Coached & Counseled by Mgt/Supervision (← links)
- 05000440/LER-1995-005, :on 950831,reactor Automatically Scramed.Caused by Equipment Failure.Inverter Unit Replaced & Instrument Power Supply Restored (← links)
- 05000440/LER-1992-013, :on 920514,turbine Stop Valves Opened Greater than 90% W/Main Steam Line Drain Valves Opened,Resulting in Drain Line Isolation on Low Condenser Vacuum.Caused by Inadequate Procedure.Work Order Revised (← links)
- 05000440/LER-1992-012-01, :on 920505,RHR Sys a Pump Tripped Due to Inappropiately Adjusted Valve Limit Switch.Caused by Program Weakness.Appropriate Switch Adjusted (← links)
- 05000440/LER-1992-012, :on 920505,RHR Sys a Pump Tripped Due to Inappropriately Adjusted Valve Limit Switch.Caused by Program Weakness.Limit Switch Reset & Appropriate Design Drawings Being Revised (← links)
- 05000440/LER-1992-009, :on 920424 & 25,discovered That HVAC Sys Operated in Normal Instead of Isolation Mode of Operation W/ Control Room Airborne Operators Inoperable.Caused by Personnel Error.Operators Trained (← links)
- 05000440/LER-1992-008, :on 920415,loss of Administrative Control of Containment Isolation Valve Resulted in TS Violation.Caused by Inadequate Procedures.Standing Order Issued to All Licensed & Nonlicensed Operators (← links)
- 05000440/LER-1992-007, :on 920331 & 0406,full Scram Signals Received from Combination of half-scram Inserted for Planned Maint & half-scram Signal from Spiking Lprm.Caused by Bumping LPRM Cable.Design Change to Upgrade Cables Under Review (← links)
- 05000440/LER-1991-018, :on 911006,control Rod 46-23 Exceeded Max Scram Time to Position 43 & Max Scram Insertion Time to Position 43.Caused by Contaminated Valve Disc & Seats.Valves Replaced W/New Valves from Two Other Lots (← links)
- 05000440/LER-1992-004, :on 920321,RWCU Sys Containment Isolation Occurred as Result of High Sys Differential Flow.Caused by Unexpected Steam Void in RWCU Regenerative Hxs.Ts Change Submitted on 911030 & Computer Monitoring Program Changed (← links)
- 05000440/LER-1992-003, :on 920228,RWCU Isolation Occurred as Result of High Differential Flow.Caused by Deficiency Associated W/Sys Vioding Phenomenon.Ts Change to Increase Differential Flow Timer Setpoint Implemented (← links)
- 05000440/LER-1992-002, :on 920228,pre-modification Cable Installation Was Declared as Violation of Integrity of Control Room Envelope.Caused by Failure to Identify pre-modification Activity.Controls Will Be Implemented (← links)
- 05000440/LER-1992-001, :on 920227,loss of Reactor Protection Sys Occurred.Caused by Failure of EPA Logic Board.Logic Board Was Replaced Following Satisfactory Calibration & 6 H warm-up Period (← links)
- 05000440/LER-1991-025-03, :on 911213,HPCS Sys Declared Inoperable After Liquid Penetrant Testing Revealed Crack in Weld Upstream of High Point Vent Valve on HPCS Test Return Line on 911212. Schedule to Inspect Other Welds Accelerated (← links)
- 05000440/LER-1991-025, :on 911212,liquid Penetrant Testing Revealed Crack in Weld Upstream of High Point Vent Valve on HPCS Sys Test Return Line.Caused by Having Insufficient Weld Metal & Contour.Other Welds to Be Inspected (← links)
- 05000440/LER-1990-036, :on 901207,control Rod Scram Accumulator Level Switch Inoperable Throughout Second Fuel Cycle in Violation of Tech Spec 3.1.3.3.Caused by Unidentified Sys Interaction. Sys Operating Instruction Revised (← links)
- 05000440/LER-1995-008, :on 950911,reactor Scram Occurred Due to Trip of Main Turbine & Subsequent Closure of Turbine Control & Stop Valves.Replaced Inverter & Restored Instrument Power Supply (← links)
- 05000440/LER-1991-027, :on 911222, Manual Reactor Scram Inserted Due to non-isolable Break in 36 Inch Fiberglass Pipe for Cooling Water.Caused by Flow in Pipe, Degradation to Pipe Support & Improper Installation of O-ring Gasket (← links)
- 05000440/LER-1991-026, :on 911216,Div I Nuclear Steam Supply Shutoff Sys Signal Resulted in Unexpected Reactor Core Isolation. Caused by Personnel Inattention to Detail.Technician Performing Surveillance Was Counseled (← links)
- 05000440/LER-1991-023, :on 911105,misadjusted Leak Detection Instrumentation Resulted in TS Violation.Caused by Equipment Problem.Reviewed Previous Uses of Transmation Model 1010 Ref Cell.Operators Will Be Instructed on Lessons Learned (← links)
- 05000440/LER-1991-022, :on 911011,while Manipulating Front Panel Switches on Drywell Atmospheric Gaseous Monitor,Radiation Monitor Indication Spiked Upscale.Caused by Unrecognized Equipment Characteristics.Info Tag Attached to Monitor (← links)
- 05000440/LER-1991-021, :on 911011,preferred Source Breaker Would Not Close on Demand from Switch on Control Room Panel Since 910904.Caused by Equipment Malfunction.Spring Pins on Tooling Racks Will Be Shortened & Instruction Revised (← links)
- 05000440/LER-1991-019, :on 911006,Tech Spec Surveillance Requirement for Rod Pattern Controller Performed Late.Caused by Personnel Error.Senior Reactor Operator Counseled & Procedures Revised Re Rod Pattern Testing Requirements (← links)
- 05000440/LER-1991-017, :on 911002,high Pressure Core Spray Pump Declared Inoperable Due to Motor Bearing Oil Reservoir Drain Plug Failure.Caused by Design Deficiency.Drain Plugs Will Be Replaced W/Ball Valve Arrangement (← links)
- 05000440/LER-1995-004, :on 950510,determined That Potential Existed for Secondary Containment Bypass Leakage Through Upper Containment Airlock to Exceed Leakage Limit.Caused by Design Inadequacies.Mod Made on hard-piped Unions (← links)
- 05000440/LER-1994-011-01, Forwards LER 94-011-01 Re Containment Isolation Valve Actuations During Restoration from Divisional Bus Outage (← links)
- 05000440/LER-1991-016, :on 910816,inadvertent Test of Radiation Monitor Results in Backup Hydrogen Purge Sys Isolation Occurred.Caused by Personnel Error.Technicians Involved Counseled & Disciplined (← links)
- 05000440/LER-1995-003, :on 950323,loss of Safety Sys Function Occurred.Caused by Inoperable RHR Snubbers.Installed Pool Swell Shields on Three RHR Snubbers During RFO4 (← links)
- 05000440/LER-1991-015, :on 910801,liquid Radwaste Discharge Made W/O Verifying Discharge Line Valving & Channel Improperly Calibr Between 910722-0801.Caused by Personnel Error.Totalizer Recalibr & Technician Counseled (← links)
- 05000440/LER-1991-014, :on 910726,RWCU Isolation Occurred Due to High Differential Temp Signal During Decontamination Activity. Caused by Personnel Error.Event Discussed During Continuing Training for Health Physics Personnel (← links)
- 05000440/LER-1991-013, :on 910723,tech Spec Violation Occurred Due to Missed Main Steam Line Flow High Isolation Actuation Instrumentation Surveillance.Caused by Personnel Error. Requalification Training Program Established (← links)
- 05000440/LER-1995-002, :on 950310,unplanned Automatic Actuation of Backup Drywell Purge Sys Isolation Valves Occurred.Caused by Personnel Error.Reactor Operator & Entire CR Staff Counseled Re Event (← links)
- 05000440/LER-1995-001, :on 950307,identified Condition Which Could Allow Primary Containment Leakage Rates to Exceed TS Limit. Caused by Inadequate Design of Airlock Lcs.Initiation of Permanent Design Change (← links)
- 05000440/LER-1991-012, :on 910605,determined That Effluent Sys Flow Rate Monitor for Turbine/Heater Bay Bldg Inoperable Since Summer 1988.Caused by Program Deficiencies.Pitot Tube Array Calibr by Capping Individual Pitot Tubes (← links)
- 05000440/LER-1994-022, :on 941111,determined That Testing of Diesel Generators Did Not Meet Definition of Staggered Test Basis. Caused by Failure of Surveillance Test Program to Properly Schedule DG Testing.Testing for DG Revised (← links)
- 05000440/LER-1994-023, :on 941212,TS LCO Action Exceeded When Plant Not Placed Into Hot Shutdown Condition.Caused by Degradation of Batch 314 Viton Seating Matl Located in Disk Holder sub-assembly.Seating Matl Replaced (← links)
- 05000440/LER-1994-021, :on 941108,maint Mechanic Identified Bridge Clamp Installed on Div 2 DG Testable Rupture Disc.Caused by Inadequate Work Procedure & Personnel Error/Failure to Follow Procedure.Restored Div 2 DG (← links)
- 05000440/LER-1994-005, :on 940209,lost Both Trains of Control Room Recirculation Due to Low Emergency Closed Cooling Temperature.Revised Appropriate Sys Operating Procedures to Maintain ECC Temperature Above 55 F (← links)
- 05000440/LER-1991-010, :on 910401,failure of Reactor Recirculation Pump Resulted in Shutdown of Plant.Caused by Component Malfunction.Contractor Replaced & Recirculation Pump Verified to Operate Properly in Low Speed (← links)
- 05000440/LER-1994-020, :on 940831,control Room Operators Identified That Div III Diesel Generator Inoperable.Caused by Personnel Error.Div III Diesel Generator Operable Status Restored (← links)
- 05000440/LER-1994-016, :on 940609,keepfill Pressure for ESW Loops B & C Was Reported as Out of Specification Low.Caused by Deficiency in SW System Design Change.Design Change Is Being Developed (← links)
- 05000440/LER-1994-020-01, :on 940831,diesel Generator Was Inoperable. Caused by Personnel Error.Disciplinary Action Was Taken Against Control Room Unit Supervisors (← links)
- 05000440/LER-1991-009, :on 910314,failure of Div 2 Diesel Generator Occurred During Monthly Surveillance Operability Test.Caused by Equipment Malfunction.Design & Procedural Changes Initiated to Prevent Recurrence (← links)
- 05000440/LER-1994-018, :on 940729,standby Train of Annulus Exhaust Gas Treatment System Automatically Started Due to Low Flow Condition on AEGTS Train.Caused by Failure of Signal Selector Card.Replaced Signal Selector Card (← links)
- 05000440/LER-1994-019, :on 940620,determined That Credit for RCIC as Closed Sys Outside of Containment Relief.Caused by Failure of Licensing & Design Basis.Discovery of Addl Bypass Leakage Pathways Have Been Identified (← links)
- 05000440/LER-1994-009, :on 940319,DG Returned to Rated Speed During Shutdown.Caused by Personnel Failure to Follow Procedures. Personnel Trained on DG Pneumatic Controls (← links)
- 05000440/LER-1991-008, :on 910305,trains of Control Room Heating & Air Conditioning Sys Inoperable Due to Inoperability of Both Supporting Chillers.Caused by Solenoid Valve on Thermal Purge Unit Failure to Close.Valve Replaced (← links)
- 05000440/LER-1994-010, :on 940414,unanticipated Automatic Start of ESW Pump a & ECC Pump a Occurred.Caused by Procedural Deficiency.Rev to PDB Load List Will Be Implemented as Appropriate (← links)
- 05000440/LER-1994-015, :on 940609,plant Operator Reported That ESW Loop Keepfill Pressure Less than Required Due to Deficiency in SW Sys Design Change.Esw Keepfill Sys Aligned to Altenate Supply Until Final C/As Completed (← links)
- 05000440/LER-1994-013, :on 940518,noted That LPCI C Loop Injection Valve Was Closed Due to Program Weakness.Suspended Core Alternations from Time Valve Was Discovered Until Compliance W/Ts 3.6.4 Action Requirement (← links)
- 05000440/LER-1991-003, :on 910106,performance of Inadequate Procedure Resulted in Main Steam Line Drain Isolations.Caused by Procedure Deficiency.Instruction Revised to Include or Ref Steps to Bypass MSL Radiation Monitors (← links)
- 05000440/LER-1991-002, :on 910101,inadvertent Turbine Stop Valve Closure Signal Resulted in Full Scram Signal Being Generated.Cause undetermined.SVI-N31-T1151 Will Be Revised to Clarify Actions Needed to Meet All Prerequisites (← links)
- 05000440/LER-1991-001, :on 910101,delta Flow High RWCU Isolation Occurred While Attempting to Shift Flow from Pump B to Pump A.Caused by Personnel Error.Control Room Operator Counseled & Event Will Be Discussed During Training (← links)
- 05000440/LER-1990-040, :on 901218,RWCU Isolation Occurred While Correcting Cause of RWCU Sys Outboard Isolation Valves Not Opening.Caused by Personnel Error.Panel & Tools Inspected for Shorting & Fuses Replaced (← links)
- 05000440/LER-1990-025-01, Responds to NRC Ltr Re Violations Noted in Insp Rept 50-440/90-20 on 900920-1116.Corective Actions:Valve Repair & Rebuilding,Per LER 90-025-01,dtd 901123 & Restoration of Six MSIV That Required Disassembly to Original Condit (← links)
- 05000440/LER-1990-039, :on 901211,discovered That Both Loops of Containment Spray Mode of RHR Sys Inoperable.Caused by Inadequate Instructions.Instructions Revised to Include Isolation Valve for Position Verification (← links)
- 05000440/LER-1990-038, :on 901211,control Room Noble Gas Radiation Monitor Inoperable for More than 7 Days W/O Taking Compensatory Actions.Caused by Personnel Error.Valve Lineup Instruction Changed & Monitor Will Be Included in Training (← links)
- 05000440/LER-1990-034, :on 901125,discovered That Reactor Pressure Vessel Water Level Instrumentation Equalizing Valve Mispositioned.Caused by Personnel Error.Equalizing Valve Closed & Walkdown Performed (← links)
- 05000440/LER-1990-021, :on 900907,MSIV Failed to Close Following Successful Slow Closures (← links)
- 05000440/LER-1994-008, :on 940225,two SRV Unexpectedly Opened Eight Times.Caused by Inadequate Instructions.Training Provided & Review of Preparation Process for Appropriate Enhancements Performed (← links)
- 05000440/LER-1990-023, :on 900907,reactor Protection Sys Bus Deenergization & Shutdown Cooling Isolation Occurred During Surveillance Testing Due to Personnel Error.Personnel Instructed on Ramifications of Inattention During Tests (← links)
- 05000440/LER-1990-017, :on 900814,thermal Power Exceeded Authorized Limits Due to Feedwater Heater Level Control Failure.Caused by Component Failure W/Contributing Procedural Deficiency. Off Normal Instruction Enhanced (← links)
- 05000440/LER-1994-007, :on 940217,passive Seismic Instrument Failure Occurred Due to Intrusion of Water.Affected Instrument, Peak Acceleration Recorder Replaced (← links)
- 05000440/LER-1994-005-01, :on 940209,loss of Both Trains of Control Room Emergency Recirculation Occurred Due to Low Emergency Closed Cooling Temp.Appropriate Sys Operating Procedures Revised (← links)
- 05000440/LER-1994-006, :on 940210,RCIC Sys Inboard Containment Cooling Isolation Occurred During Isolation of Logic Sys Functional Surveillance Instruction.Caused by Inadequate Procedure. Surveillance Instruction to Be Revised (← links)
- 05000440/LER-1994-003, :on 940129,lower Air Lock Inoperable,Inner Door Opened in Containment Area for One Minute.Caused by Failure of Outer Door Seal to Deflate as Result of Broken Stem.C/A:Ball Valve Repaired (← links)
- 05000440/LER-1990-024, :on 900909,determined That Failure to Properly Control Surveillance Testing Resulted in Suppression Pool Instrumentation Being Out of Svc.Caused by Procedural Deficiency.Licensed Operators Trained to Lessons Learned (← links)
- 05000440/LER-1994-002, :on 940128,both Reactor Recirculation Sys Pumps Automatically Downshifted from Fast to Slow Speed.Caused by Equipment Failure.Alarm Cards w/1C34-K618B & Alarm Card in Redundant Trip Sys 1C34-K618A Replaced (← links)
- 05000440/LER-1994-001, :on 940118,sys Containment Isolation Occurred Due to Reactor Cleanup Sys Valve Nest Room High Differential Temp.Caused by Failure of Inlet Temp Switches.Ab Ventilation Sys Fans Inlet & Temp Switches Replaced (← links)
- 05000440/LER-1993-020, :on 931204,missed Hourly Fire Watches Resulted in Fire Protection Program Violation.Caused by Personnel Error.Personnel Counseled & Plant Administrative Procedure PAP-1916 Will Be Revised (← links)
- 05000440/LER-1990-031, :on 901022,control Rod Withdrawn W/O First Demonstrating by Channel Check That Scram Discharge Vol Level Instrumentation Operable (← links)
- 05000440/LER-1990-027, :on 900925,personnel Error Resulted in Air Roll of Div 1 Diesel Generator (← links)
- 05000440/LER-1990-018, :on 900817,determined That Containment Average Temp/Relative Humidity Not Verified within Tech Spec Figure 3.6.5.2-1 Limits.Caused by Programmatic Weakness in Use of Process Computer Sys Info to Determine Tech Spec Compliance (← links)
- 05000440/LER-1990-019, On 900817 & 0901,liquid Radiological Effluent Releases Performed W/Radioactive Effluent Monitoring Instrumentation Inoperable W/O Completing Independent,Per Tech Spec 3.3.7.9.On 900820,channel Improperly Calibr (← links)
- 05000440/LER-1990-004, :on 900329,determined That 12 Snubbers Not Inspected on 900302 & Two Snubbers Not Inspected on 900327, Per Tech Spec 4.7.4.Caused by Program Inadequacy.Procedures Changed & Snubber Program Evaluated (← links)
- 05000440/LER-1993-009, :on 930325,containment Vessel & Drywell Purge Sys Isolation Occurred.Caused by Fuel Leakage Leading to High Iodine Loading on Rwcu.Hold Time Provision Built Into RWCU F/D Backwash Process (← links)
- 05000440/LER-1993-019, :on 931115,discovered Failure to Identify Failed Channel Checks Due to Personnel Error,Resulting in TS Violation.Ts Rounds Administrative Procedure Program Revised & Training Provided (← links)
- 05000440/LER-1990-005, :on 900405,HPCS Declared Inoperable Due to Fuel Oil Sediment Exceeding Tech Spec Limits.Caused by Fuel Oil & Storage Tank Degradation,Due to Contaminant in Biocide Additive.Contaminated Biocide Additive Removed (← links)
- 05000440/LER-1990-016, :on 900710,condensate Storage Tank Level Low Actuation Instrumentation Failure Resulted in HPCS Shift. Caused by Component Failure.Rosemount Master Trip Unit Replaced (← links)
- 05000440/LER-1993-018, :on 931104,TS Violation Occurred Due to Installation Deficiencies for Target Rock Valves.Target Rock SOVs Inspected & Affected Valves Repaired & Retested.Maint Personnel Trained (← links)
- 05000440/LER-1990-028, :on 901009,failure to Perform Surveillance Resulted in Inoperable Containment Isolation Valves (← links)
- 05000440/LER-1993-017, :on 931027,failure to Perform Local Leak Rate Testing on RHR Sys Test Return Lines Occurred,Per 10CFR50 App J Requirements.Caused by Possible Leakage Paths.Design Change Implemented (← links)
- 05000440/LER-1993-003, :on 930113-14,LLRT of Three MSL Penetrations Determined Leakaged in Excess of Ts.Caused by Defective Gaskets.Valves & Flanges Replaced & Retested (← links)
- 05000440/LER-1990-014, :on 900621,trains of Control Room HVAC Sys Actuated Unexpectedly in Emergency Recirculation Mode of Operation.Caused by Multiple Personnel Errors.Personnel Reinstructed Re Using Appropriate Drawings for Application (← links)
- 05000440/LER-1993-015, :on 930709,unexpected RRP Fast to Slow Speed Downshift Occurred Due to Failure of Both RRP Suction Temp Rtd.Replaced & Returned RTD to Mfg for Failure Analysis (← links)
- 05000440/LER-1993-014, :on 930703,TS 3.0.3 Entered Due to Failure of Racs Power Supply.Replaced 5 Volt Power Supply in Racs Cabinet (← links)
- 05000440/LER-1993-013, :on 930608,control Room HVAC Sys Train a Supply Fan Tripped on Overcurrent,Resulting in Both Sys Trains Being Unavailable.Caused by Motor Winding Insulation Failure.Motor Repaired by Mfg (← links)
- 05000440/LER-1993-012, :on 930607,noted That HPCS Initiation Signal Resulted in Auto Start of Div 3 DG & ESW Sys.Caused by Failure of Div 3 Reserve Battery Charger.Procedures Used for Insp & Maint of Battery Being Modified (← links)
- 05000440/LER-1993-011, :on 930419,identified That Excessive Strainer Differential Pressure Across RHR Suction Strainers Could Have Compromised Long Term Cooling During LOCA Operation. Caused by Inadequate Program Requirements (← links)
- 05000440/LER-1993-004, :on 930121,MOV Testing of Main Steam Line Drain & Bypass Outboard Isolation Valve Indicated That Thrust Less than Design Thrust to Close Valve Under Accident Conditions. Review,Per GL 89-10 in Progress (← links)
- 05000440/LER-1990-013, :on 900619,discovered That Main Steam Line Radiation Monitor C Inoperable for Greater than Time Allowed by Tech Specs 3.3.1.a & 3.3.1.b.Caused by Personnel Error. Personnel Counseled (← links)
- 05000440/LER-1990-010, :on 900521,Tech Spec Action Requirements Not Implemented for Inoperable Control Rod Scram Accumulators. Caused by Inadequate Procedures & Malfunctioning Transformer.Analyzer Reset & Leakage Monitored (← links)
- 05000440/LER-1990-011, :on 900521,discovered That Divisional LPCI & LPCS Sys Inoperable in Excess of Tech Spec Action Limits Between 871119-23 & 891218-22.Caused by Procedural Deficiency.Sys Operating Instruction Revised (← links)
- 05000440/LER-1990-009, :on 900517,RHR Sys B HX Bypass Valve Failed to Reposition on Demand,Rendering RHR Sys Train Operable for Containment Spray Cooling Mode of Operation.Caused by Failure of Valve Stem Nut.Stem Nut Replaced (← links)
- 05000440/LER-1990-008, :on 900420,unexpected Isolation of RWCU Sys Occurred.Caused by Component Failure.Faulty Transmitter Transmitter Identified & Replaced (← links)
- 05000440/LER-1990-007, :on 900418,ruptured Seal on Outer Door of Upper Containment Airlock Occurred Causing Loss of Containment Integrity.Caused by Inadequate Communications & Equipment Failure.Seal on Outer Door Replaced (← links)
- 05000440/LER-1990-006, :on 900411,control Room Emergency Recirculation Sys Found to Be Inoperable & Tech Specs 3.0.3 Entered on Three Occasions.Caused by Operator Error & Component Failure,Respectively.Personnel Retrained (← links)
- 05000440/LER-1993-010, :on 930326,manual Reactor Scram Inserted Due to Rupture in 30 Inch Section of Underground SW Piping.Caused by Pipe Bending Due to Localized Loss of Soil Support. Failed Portion of SW Piping Being Repaired (← links)
- 05000440/LER-1993-008, :on 930317,fire Detection Malfunctioning Resulted in Fire Protection Program Violation.Caused by Equipment Malfunctioning & Design.Administrative Controls Implemented to Update Alarm State Changes (← links)
- 05000440/LER-1993-007, :on 930218,determined That Snubbers May Have Been Inoperable Since 1992 Nonconformance Rept.Caused by Dried Out Lubricant Resulting from Exposure to Elevated Temps.All Snubbers Will Be Functionally Tested (← links)
- 05000440/LER-1993-006, :on 930212,while Transferring AEGTS from B Train to a Train,B Train Automatically Restarted.Caused by Personnel Error.Event Will Be Reviewed W/Operators as Part of Routine Operator Requalification Training (← links)
- 05000440/LER-1993-005, :on 930116,fuel Vacuum Sipping Results Indicated Large Number of Fuel Defects & Fission Products. Caused by Fission Product Contamination of Corrosion Layer. Two Slow Riser Bundles Inspected (← links)
- 05000440/LER-1991-007, :on 910209,pressure Switch Instrument Drift Caused Automatic Start of Annulus Exhaust Gas Treatment Sys. Caused by Component Failure.Switch Recalibrated to Adjust Setpoints to Proper Value (← links)
- 05000440/LER-1991-006, :on 910202,inboard Isolation Valves Closed on RWCU Delta Flow High Signal During Removal of RWCU Filter from Svc.Caused by Personnel Error.Sys Operating Instruction Being Revised (← links)
- 05000440/LER-1991-005, :on 910129,discovered That Two Power Supplies Had Excessive Ripple Effect When All Rods Pushbutton Depressed,Resulting in Loss of Scram Accumulator Fault Indication.Caused by Personnel Error (← links)
- 05000440/LER-1991-004, :on 910120,three Reactor Water level-high (Level 8) Channels Inoperable Due to Blown Fuse.Caused by Voltage Spike.Circuitry Associated W/Trip Relays Modified (← links)
- 05000440/LER-1990-041, :Between 901212 & 28,inoperable Reactor Pressure Vessel Level Instrumentation Channels Resulted in HPCS Sys Being Inoperable & in Tech Spec Violation.Caused by Personnel Error.Memo Issued (← links)
- 05000440/LER-1990-020, :on 900831,maint Activities on Control Room Emergency Recirculation Sys Resulted in Tech Spec Violation & Compromise of Safety Sys.Caused by Program Deficiency. Maint Acitivities & Insp Being Revised (← links)
- 05000440/LER-1990-033, :on 901120,Train B of Control Room HVAC Sys Actuated Unexpectedly in Emergency Recirculation Mode.Caused by Inadequate Instruction.Procedure Revised Re Correct Guidance During Loss of Power to Bus K-1-N (← links)
- 05000440/LER-1990-032, :on 901116,disconnecting Wires to Test Relay Contact Resulted in RHR a Shutdown Cooling Sys Isolation. Caused by Procedure Deficiency & Inadequate Instructions. Personnel Trained Re Review of Work Orders (← links)
- 05000440/LER-1990-003, :on 900222 & 23,discovered That Stroke Time Measurements Not Performed in Both Directions for motor- Operated Valves in safety-related Sys.Caused by Program Deficiency.Procedural Enhancement Implemented (← links)
- 05000440/LER-1990-002, :on 900107,RCIC Sys Isolated Due to High Differential Temp Signal Detected Across RCIC Room Cooler Following Reactor Scram Due to Loss of Feedwater Flow. Caused by Design Deficiency.Procedures Re Flow Rate Revised (← links)
- 05000440/LER-1990-001, :on 900107,reactor Scram Occurred After Improper Transfer of 480-volt Ac Power Supplies Resulted in Total Loss of Feedwater Flow & Power Interruption.Caused by Personnel Error.Operator Counseled & Instructions Revised (← links)
- 05000440/LER-1989-031, :on 891206,08 & 15,RWCU Sys Isolations Occurred.Caused by Design Deficiency & Deficiency in Leak Detection/Differential Flow Circuitry Setpoint &/Or Time Delay.Leak Detection Thermocouples Relocated (← links)
- 05000440/LER-1989-030, :on 891125,plant Entered Tech Spec 3.0.3 Due to Two Untrippable Control Rods.Caused by Failure to Return Scram Pilot Valves Used for Rods to Mfg After Recall. Surveillance Instruction Revised (← links)
- 05000440/LER-1989-032, :on 891228 & 900105,HPCS Sys Declared Inoperable Due to Inoperability of Div 3 Battery.Caused by Low Pilot Cell Voltage,Cell W/Slow Electrolyte Leak & Blown Power Fuse.Fuse & Hydromotor Pump Replaced (← links)
- 05000440/LER-1989-029, :on 891117,heater Bay/Turbine Bldg Vent Gaseous Effluent Particulate & Iodine Samples Not Continuously Collected as Required by Tech Spec 3.3.7.10.Caused by Procedure Deficiency.Procedure Revised (← links)
- 05000440/LER-1989-028, :on 891008,concluded That Operation of Fuel Pool Cooling & Cleanup Sys to Upper Containment Pools Caused Containment Vacuum Breaker Actuations.Caused by Unrecognized Sys Interaction.Operating Instruction Revised (← links)
- 05000440/LER-1987-010, :on 870228,operators Failed to Place at Least One Reactor Protection Sys Trip Sys in Tripped Condition within 1 H.Caused by Personnel Error & Deficient Procedure. Personnel Counseled & Procedures Revised (← links)
- 05000440/LER-1989-027, :on 890925,loss of Control Power to Emergency Svc Water Sys Pump Discharge Valve a Rendered Sys Inoperable.Caused by Personnel Error Re Jumper Placement. Involved Technicians Counseled (← links)
- 05000440/LER-1989-026, :on 890913,reactor Thermal Power Level Exceeded That Specified in OL Due to Unexpected Recirculation Sys Flow Control Transient.Caused by Component Failure.Failed Isolation Solenoid Valve Replaced (← links)
- 05000440/LER-1987-009, :on 870227,failure of Two Control Air Solenoid Valves Rendered Div I & II Diesel Generators Inoperable. Cause Unknown.Solenoid Valves Replaced & Plant Administrative Procedure PAP-1705 Revised (← links)
- 05000440/LER-2019-004-01, Loss of Feedwater Heating Results in Loss of Safety Function (← links)
- 05000440/LER-2024-004, Division 3 Diesel Generator Inoperable Due to Low Output Voltage Resulting in Loss of Safety Function (← links)
- 05000440/LER-2019-004, Loss of Feedwater Heating Results in Loss of Safety Function (← links)
- 05000440/LER-2019-003, Equipment Fault Causes Turbine Stop Valve Closure and Reactor Protection System Actuation (← links)
- 05000440/LER-2019-002, Loss of Safety Function Due to Low Pressure Core Spray Inoperability (← links)
- 05000440/LER-2019-001, Loss of Generator Excitation Causes Turbine Trip and Reactor Protection System Actuation (← links)
- 05000440/LER-2018-003, Unanalyzed Condition Resulting from Unfused Alternating Current Control Circuits (← links)
- 05000440/LER-2018-002, Failed Fuse Leads to Loss of Safety Function (← links)
- 05000440/LER-2018-001, Regarding Loss of Safety Function and Violation of Technical Specifications Due to Diode Failure (← links)
- 05000440/LER-2017-007, For Perry Nuclear Power Plant Regarding High Pressure Core Spray Inoperability Due to System Leak (← links)
- 05000440/LER-1917-006, Regarding Loss of Safety Function Due to the Inoperability of Both Trains of Motor Control Center Ventilation (← links)
- 05000440/LER-1917-005, Regarding Controller Malfunction Results in Momentary Degradation of Secondary Containment Pressure (← links)
- 05000440/LER-1917-004, Re Loss of Safety Function for High Pressure Core Spray Suppression Pool Level Instrumentation (← links)
- 05000440/LER-1917-002, Regarding Loss of Safety Function Due to Main Turbine Bypass Valve Opening (← links)
- 05000440/LER-1917-003, Regarding Annulus Exhaust Gas Treatment System Loss of Safety Function (← links)
- 05000440/LER-2016-004, Regarding Loss of Safety Function Due to Two Inoperable Standby Liquid Control Subsystems (← links)
- 05000440/LER-2016-003-01, 1 for Perry Nuclear Power Plant Loss of Safety Related Electrical Bus Results in a Loss of Shutdown Cooling (← links)
- 05000440/LER-2016-001-01, 1 for Perry, Unit 1, Regarding Pressure Boundary Leakage, Level 8 Automatic Scram, and APRM Loss of Safety Function (← links)
- 05000440/LER-2016-003, Regarding Loss of Safety Related Electrical Bus Results in a Loss of Shutdown Cooling (← links)
- 05000440/LER-2016-002, Regarding Manual Reactor Scram Due to Spurious Opening of Safety Relief Valve (← links)
- 05000440/LER-2016-001, Regarding Drywell Leakage, Level 8 Automatic Scram and APRM Loss of Safety Function (← links)
- 05000440/LER-2015-001, Regarding Degraded Voltage Relay Found Outside the Allowable Value (← links)
- 05000440/LER-2014-005, Regarding Loss of Feedwater Results in Automatic Reactor Protection System Actuation (← links)
- 05000440/LER-2014-004, Regarding Loss of Feedwater Results in Automatic Reactor Protection System Actuation (← links)
- 05000440/LER-2014-002, Regarding Division 2 Diesel Generator Inoperability Results in Loss of Safety Function and Condition Prohibited by Technical Specifications (← links)
- 05000440/LER-2014-001, Failure to Comply with Technical Specification 3.4.11 - Reactor Coolant System Pressure/Temperature Limits (← links)
- 05000440/LER-2013-004, Regarding Vulnerability. to Cause Secondary Fire Due to Unfused Control Room Ammeters (← links)
- 05000440/LER-2013-003, Shutdown Required by Technical Specifications Due to RCS Pressure Boundary Leakage (← links)
- 05000440/LER-2013-002, Regarding Condition Prohibited by Technical Specifications Due to Scram Discharge Volume Level Switch Isolation (← links)
- 05000440/LER-2013-001, Regarding Loss of Feedwater Results in Automatic Reactor Protection System Actuation (← links)
- 05000440/LER-2012-002, Regarding Inoperable High Pressure Core Spray System Results in Loss of Safety Function (← links)
- 05000440/LER-2012-001, For Perry Nuclear Power Plant Regarding Manual Reactor Protection System Actuation Due to Automatic Turbine Generator Runback (← links)
- 05000440/LER-2011-004, Regarding Flooding Calculation Deficiency Results in Unanalyzed Condition (← links)
- 05000440/LER-2011-003, For Perry Nuclear Power Plant Unit 1, Regarding Switchyard Configuration During Startup Results in Operation Prohibited by Technical Specifications (← links)
- 05000440/LER-2011-002, Regarding Condition Prohibited by Technical Specifications and Plant Shutdown Due to Unit 1 Startup Transformer Issues (← links)
- 05000440/LER-2011-001, Fire Protection Design Vulnerability Results in an Unanalyzed Condition (← links)
- 05000440/LER-2010-003, Regarding Loss of Control Rod Drive Header Pressure Results in Manual RPS Actuation (← links)
- 05000440/LER-2010-002, Regarding Piping Leak Results in Condition Prohibited by Technical Specifications (← links)
- 05000440/LER-2010-001, Regarding Invalid Isolation Signal Results in Shutdown Cooling Interruption (← links)
- 05000440/LER-2009-003, Regarding Completion of Technical Specifications Required Shutdown Due to Division 2 Emergency Service Water (ESW) Inoperability (← links)
- 05000440/LER-2009-001, For Perry Nuclear Power Plant, Regarding MSR High Level Signal Causes Turbine Trip and Reactor Protection System Actuation (← links)
- 05000440/LER-2009-002, For Perry Nuclear Plant, Regarding Diesel Generator CO2 Fire Suppression Control Panel Miswiring Results in an Unanalyzed Condition (← links)
- 05000440/LER-2007-003-01, Regarding Improper Containment Floor Grating Installation Results in an Unanalyzed Condition, Supplement (← links)
- 05000440/LER-2008-003, Inoperable High Pressure Core Spray System Results in Loss of Safety Function (← links)
- 05000440/LER-2007-008, Single Recirculation Loop Operation Results in Planned Reactor Shutdown (← links)
- 05000440/LER-2007-007, Regarding Reactor Recirculation Pump Failure Results in Manual Reactor Protection System Actuation (← links)
- 05000440/LER-2008-002, Regarding Inoperable Emergency Closed Cooling System Results in Conditions Prohibited by Technical Specifications (← links)
- 05000440/LER-2008-001, Regarding Condition Prohibited by Technical Specifications Due to Unrecognized Reactor Core Isolation Cooling Inoperability (← links)
- 05000440/LER-2007-006, Regarding Loss of Safety Function and Condition Prohibited by Technical Specifications Due to Annulus Exhaust Gas Treatment System Inoperability (← links)
- 05000440/LER-2007-004-01, 1 for Perry Nuclear Power Plant Re Automatic Reactor Protection System Actuation Due to Feedwater Control Power Supply Failure (← links)
- 05000440/LER-2007-005, Regarding Plant Startup with Inoperable Reactor Core Isolation Cooling System (← links)
- 05000440/LER-2007-004, Automatic Reactor Protection System Actuation Due to Feedwater Control Power Supply Failure (← links)
- 05000440/LER-2007-002, For Perry, Shutdown Cooling Pump Trip Results in Operation Prohibited by Technical Specifications (← links)
- 05000440/LER-2007-001, From Perry Regarding Automatic Reactor Protection System Actuation Due to Reactor Coolant Level Decrease (← links)
- 05000440/LER-2006-006, Re Primary Containment Airlock Door Inoperability Results in Operation Prohibited by Technical Specifications (← links)
- 05000440/LER-2006-005, Decreasing Instrument Air Pressure Results in Manual Reactor Protection System Actuation (← links)
- 05000440/LER-2006-004, Re Oscillation Power Range Monitors (Oprms) Inoperable (← links)
- 05000440/LER-2006-002, Regarding Scaffold Built in the Containment Pool Swell Region (← links)
- 05000440/LER-2006-001, Re Incorrect Wiring in the Remote Shutdown Panel Results in a Fire Protection Program Violation (← links)
- 05000440/LER-2005-003, For Perry Nuclear Power Plant Lack of Suction Flow Path Causes High Pressure Core Spray to Be Inoperable (← links)
- 05000440/LER-2005-002, Regarding All Emergency Diesel Generators Declared Inoperable Due to Degraded Testable Rupture Discs (← links)
- 05000440/LER-2005-001, And LER 05-001-00 Perry Nuclear Power Plant Regarding Unplanned Automatic Oscillation Power Range Monitor Scram and Manual Reactor Scram Following Unexpected Reactor Recirculation Pump Trip (← links)
- 05000440/LER-2003-005-01, 1 for Perry Nuclear Power Plant Regarding Technical Specification Violation/Loss of Safety Function Due to Air Bound Water-Leg Pump (← links)
- 05000440/LER-2003-004-02, Regarding Emergency Service Water Pump Upper Shaft Coupling Sleeve Failure (← links)
- 05000440/LER-2003-006, Regarding Loss of Safety Function and Limiting Condition for Operation 3.0.3 Entry Due to Support System Inoperability (← links)
- 05000440/LER-2003-004-01, Regarding Emergency Service Water Pump Upper Shaft Coupling Sleeve Failure (← links)
- 05000440/LER-2003-005, For Perry Technical Specification Violation/Loss of Safety Function Due to Air Bound Water-leg Pump (← links)
- 05000440/LER-2003-004, Regarding Emergency Service Water Pump Upper Shaft Coupling Sleeve Failure (← links)
- 05000440/LER-2003-003, Regarding Unrecognized Diesel Generator Inoperabililty During Mode Changes (← links)
- 05000440/LER-2003-002, Regarding Reactor Scram as a Result of a Loss of Off-Site Power (← links)
- 05000440/LER-2003-001, Regarding Manual Actuation of the Reactor Protection System with All Control Rods Inserted During Testing (← links)
- 05000440/LER-2002-003, Regarding Inadequate Emergency Closed Cooling Water Surveillance Instruction Results in Loss of Safety Function (← links)
- 05000440/LER-2002-002, Re Failure of the High Pressure Core Spray Pump to Start (← links)
- 05000440/LER-2002-001, For Perry Unplanned Automatic Scram During Main Turbine Mechanical Trip Weekly Testing (← links)
- 05000440/LER-2001-005, Re Automatic RPV Level Scram, Specified System Actuations and Inoperability of the Division 3 Diesel Generator (← links)
- 05000440/LER-2024-005, Division 3 Diesel Generator Inoperable Due to Failure of the Right Bank Air Start Motor (← links)
- 05000440/LER-2022-002, Steam Bypass Valve Demand Limited on the B Train Due to a Degraded Signal in the Max Combined Flow Limit Circuit (← links)
- 05000440/LER-2025-001, Automatic Actuation of Division 3 Diesel Generator Resulting from Startup Transformer Testing (← links)