Pages that link to "05000443/LER-2020-001, Manual Reactor Trips Due to Control Rod Bank Unexpectedly Inserting"
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The following pages link to 05000443/LER-2020-001, Manual Reactor Trips Due to Control Rod Bank Unexpectedly Inserting:
Displayed 8 items.
- 10 CFR 50.73(a)(2)(ii)(B), Unanalyzed Condition (← links)
- 10 CFR 50.73(a)(2)(v)(A), Loss of Safety Function - Shutdown the Reactor (← links)
- 10 CFR 50.73(a)(2)(v)(B), Loss of Safety Function - Remove Residual Heat (← links)
- 10 CFR 50.73(a)(2)(vii), Common Cause Inoperability (← links)
- 10 CFR 50.73(a)(2)(ii)(A), Seriously Degraded (← links)
- 10 CFR 50.73(a)(2)(i)(A), Completion of TS Shutdown (← links)
- ML20209A542 (redirect page) (← links)
- 05000443/LER-2020-001 (redirect page) (← links)
- 05000443/LER-2001-004 (← links)
- 05000443/LER-2001-003 (← links)
- 05000443/LER-2001-002 (← links)
- 05000443/LER-2001-001 (← links)
- 05000443/LER-1990-004, Forwards Util Commitment to Perform Visual Insp of Four Feedwater Sys Check Valves Dash Plate Capscrews During First Refueling Outage,Per LER 90-004-00 (← links)
- 05000443/LER-1992-002, Forwards License Amend Request 92-12 to License NPF-86, Changing TS to Correct Acceptance Value for Sum of RHR Sys Injection Line Flow Rates,Per LER 92-02-00 (← links)
- 05000443/LER-1998-014, Forwards LER 98-014-00 for Event That Occurred at Seabrook Station on 981222.Encl 2 Is List of Util Commitments Made in Response to LER (← links)
- IR 05000443/2020010 (← links)
- 05000443/LER-1998-003, Forwards LER 98-003-00,re Class 1E 125 Vdc Battery Surveillance Testing Which Occurred on 980217 (← links)
- 05000443/LER-2024-001, Condition Prohibited by Technical Specifications - Transformer Bushing Failure - Offsite AC Sources (← links)
- 05000443/LER-2023-005, Auxiliary Feedwater System Inoperable (← links)
- 05000443/LER-2023-004, Manual Reactor Trip Due to Main Turbine Electro-Hydraulic Control Oil Level (← links)
- 05000443/LER-2023-003, Reactor Protection System Manual Actuation Due to Failed Silicon Controlled Rectifiers (← links)
- 05000443/LER-2023-002, Automatic Actuation of Emergency Service Water During Testing Due to a Defective Relay (← links)
- 05000443/LER-2023-001, Automatic Actuation of B Emergency Diesel Generator Emergency Power Sequencer (← links)
- 05000443/LER-2021-002, Condition Prohibited by Technical Specifications Entered Due to Service Water Cooling Tower Fan Inoperable (← links)
- 05000443/LER-2021-001, Pressurizer Safety Valve Outside of Technical Specification Limits Discovered During As-Found Set Point Testing (← links)
- 05000443/LER-1998-004, :on 980504,shift Manager Left Area Defined as CR Area While Performing SRO in CR Area Function.Caused by Personnel error.On-duty ROs Noted Absence of Shift Manager, Shift Manager re-entered CR Area & Received Counseling (← links)
- 05000443/LER-1998-005, :on 980501,inoperability of SG Steam Line Pressure Protection Channels Was Noted.Caused by Procedural Deficiencies.Revised Procedures to Ensure Correct & Consistent Interpretation of Record Traces (← links)
- 05000443/LER-1989-008, :on 890622,manual Reactor Trip Occurred During Natural Circulation Test.Caused by Feedback Linkage Becoming Disconnected During Test.Corrective Actions for Valves Scheduled.Comprehensive Pretesting Revised (← links)
- 05000443/LER-1989-009, :on 890810,primary Component Cooling Water Head Tank Rate of Change Alarm Out of Svc,Requiring That Sampling of Effluent Pathway Occur Every 12 H.Sample Taken Not Analyzed for 10,000 (← links)
- 05000443/LER-1989-010, :on 890815,potential Transformer Fuse Cubicle for Emergency Bus E-6 Inadvertently Opened by Operator. Caused by Auxiliary Operator Error.Review of Tagging Order Performed & Operator Counseled (← links)
- 05000443/LER-1989-007-06, :on 890610,ESF Actuation Occurred Causing Containment Ventilation Sys to Isolate.Caused by Faulty Geiger-Muller Tube.Defective Tube Replaced & Monitor Tested & Declared Operational on 890611 (← links)
- 05000443/LER-1989-006, :on 890409 & 17,letdown Isolation Valve Found in Open Position & Energized W/Normal Letdown Secured & Air Supply Valve to Excess Letdown Isolation Valve Found in Open Position Contrary to Requirements,Respectively (← links)
- 05000443/LER-1989-005, :on 890325,train B Emergency Diesel Generator HX Outlet Valve Failed to Open & Prevented Svc Water Flow Through Hx.Caused by Valve Stem Bushing Becoming Uncoupled from Valve Stem (← links)
- 05000443/LER-1989-004, :on 890321,automatic Isolation of Control Room Ventilation Sys Occurred.Caused by Momentary Loss of Power to Train B East & West Remote Air Intake Radiation Monitors (← links)
- 05000443/LER-1987-015, :on 870813,multiple ESFs Associated W/Train B Actuated.Caused by Actuation of Safety Injection Reset. Installation Procedures for Mod Amended to Require That Solid State Protection Sys Be in Test Mode (← links)
- 05000443/LER-1998-008, :on 980623,inadvertent Engineered Safety Features Actuation Occurred.Caused by Personnel Error.Test Was Stopped,Event Reviewed & Evaluated & Surveillance Test Was Subsequently Completed W/O Further Incident (← links)
- 05000443/LER-1998-007, :on 980619,inoperable PORV Channel Calibration Was Noted.Caused by Procedural Technical Inaccuracies.Porv Channel Calibration Surveillance Test Were Changed & Retested for Issues Identified on 980619 (← links)
- 05000443/LER-1987-019, :on 871013,three Ite Gould/Telemecanique Class J Relays Failed in nonsafety-related Circulating Water Sys. Caused by Broken Pieces of Magnet Yoke Assembly Jamming Relays.Analysis Will Be Completed by 880118 (← links)
- 05000443/LER-1998-006, :on 980611,plant Was Shutdown Due to Inoperability of Control Room Air Conditioning Subsystem. Caused by Inadequate Design of Subsystem.Assembled Task Force to Review History of Subsystem & Incorporated Mods (← links)
- 05000443/LER-1987-017, :on 871007,Surveillance Procedure OX1456.24 Did Not Satisfy Tech Spec Surveillance Requirements.Caused by Procedure Inadequacy.Affected Procedures Revised to Include Continuity Check (← links)
- 05000443/LER-1989-003, :on 890214,automatic Isolation of Control Room Ventilation Sys Occurred,Resulting in Transfer of Sys from Normal to Recirculation Mode.Caused by Spurious High Signal from West Air Intake Radiation Monitor (← links)
- 05000443/LER-1989-002, :on 890203,determined Portable Cooling Tower Makeup Pump Required by Tech Spec 3.7.5, UHS, Stored Contrary to Requirements of Subj Spec.Caused by Inadequate Surveillance Procedures (← links)
- 05000443/LER-1989-001, :on 890121,automatic Isolation of Control Room Ventilation Sys VI Occurred Which Resulted in Transfer of Sys from Normal Mode of Operation to Recirculation Mode. Caused by Failure of Radiation Detector (← links)
- 05000443/LER-1987-016, :on 870819,Trains a & B of Control Room Makeup Ventilation Supply & Exhaust Subsystem Would Not Perform safety-related Function.Caused by Sys Hardware Design & Procedural Inadequacies.Procedures Changed (← links)
- 05000443/LER-1997-013, :on 970728,turbine Gland Seal Condenser Exhaust Radioactive Gaseous Effluent Monitor Was Declared Inoperable.Caused by Personnel Error.Samplers Outlet Line Was Replaced W/Flexible Tubing (← links)
- 05000443/LER-1999-002, :on 990921,determined That TS 3.8.1.1 Actions Were Not Met.Caused by Personnel Error.Requirements of TS 3.8.1.1.b Were Subsequently Met by Completion of Test Required by TS 4.8.1.1.1a.With (← links)
- 05000443/LER-1997-014, :on 970923,non-conservative RHR Valve Low Pressure Open Permissive Bistable Setting Occurred.Caused by Acceptance of TS Surveillance Requirement for RHR Lpi.Tech Specs Will Be Revised (← links)
- 05000443/LER-1998-002-01, Forwards LER 98-002-01 Re Event That Occurred on 980113 at Seabrook Station.Suppl LER Being Submitted to Retract LER 98-002-00.Util Determined That Condition Described in LER 98-002-00 Not Reportable Per 10CFR50.73 (← links)
- 05000443/LER-1998-003-01, :on 980217,class 1E 125 Vdc Battery Surveillance Testing Occurred.Caused by Inadequate Review of TS Requirements.Battery Performance Discharge Test Surveillance Procedure Will Be Revised (← links)
- 05000443/LER-1987-014, :on 870429,vital Bus E6 Tripped,Resulting in Starting & Loading of Diesel Generator 1B.Caused by Deficiency in Procedure Used to Measure Relay Response Time. Procedure Revised (← links)
- 05000443/LER-1987-013, :on 870425,temp Monitoring Not Performed for Two of Four Control Bldg Battery Rooms as Required by Tech Specs.Temporary Thermometers Installed in Battery Rooms a & B & Temp Readings Recorded Every 12 H (← links)
- 05000443/LER-1987-012, :on 870416,multiple ESFs Actuated.Caused by Inadvertent Makeup of Reset Contacts on Train B Low Main Steamline Pressure Safety Injection Block/Reset Switch. Safety Injection Terminated (← links)
- 05000443/LER-1986-001, :on 861023,during Surveillance of Locked Closed Valves,Valve CS-V744 Found Incorrectly Locked in Open Position.Caused by Personnel Error.Retraining of Auxiliary Operators Being Done (← links)
- 05000443/LER-1987-010, :on 870302,hi-hi Water Level Spike in Steam Generator a Initiated Main Feedwater Isolation.Caused by Opening Sequence of Msivs.Procedural Changes Made (← links)
- 05000443/LER-1987-003, :on 870202,failure to Perform Surveillance Test on Source Range Nuclear Instrumentation within Specified Interval Discovered.Caused by Personnel Error.Procedure for Surveillance Test Scheduling Being Revised (← links)
- 05000443/LER-1987-002, :on 870118,supply Breaker to Bus E6 Inadvertently Opened Causing Diesel Generator Output Breaker to Open & Emergency Power Sequencer to Activate.Caused by Operator Error.Operators Instructed (← links)
- 05000443/LER-1987-001, :on 870108,automatic Isolation of Control Room Ventilation Sys Occurred.Caused by East Air Intake Radiation Monitor RM RE6506A Failure.Monitor Assembly Replaced (← links)
- 05000443/LER-1987-011, :on 870403,dc Bus 11A Experienced Undervoltage Condition Which Resulted in Train a Emergency Power Sequencer Sensing Loss of Power Condition.Caused by Deficient Procedure.Procedure Revised (← links)
- 05000443/LER-1986-003, :on 861230,automatic Isolation of Control Room Ventilation Sys Occurred & Resulted in Transfer of Sys from Normal to Recirculation Mode.Caused by Electronic Spike of West Air Intake Radiation Monitor RM RE6507A (← links)
- 05000443/LER-2020-001, Manual Reactor Trips Due to Control Rod Bank Unexpectedly Inserting (← links)
- 05000443/LER-1987-009, :on 870310,multiple ESFs Actuated During Removal of MSIV MS-V86 from Svc.Caused by Personnel Error. Responsible Personnel Counselled & Specific Guidance Provided Re Proper Tagging of MSIVs (← links)
- 05000443/LER-1987-008, :on 870305, at All Times Log Inadvertently Completed Instead of Required Tech Specs Daily Log.Caused by Personnel Error.Title of at All Times Log Revised & Log Removed from Control Room (← links)
- 05000443/LER-1999-001, :on 990329,determined That Train B EDG May Not Have Been Operable During Portions of Previous Operating Cycle.Caused by Formation of Corrosion Products on Relay Contacts & Improper Relay Calibr Settings.Procedure Revised (← links)
- 05000443/LER-1987-007, :on 870304,Train a Reactor Trip Breaker Inadvertently Tripped.Caused by Personnel Error.All Shifts Informed of Event to Ensure Added Caution During Future Performance of Surveillance (← links)
- 05000443/LER-1987-005, :on 870214,panel Mounted Indicators Found Improperly Secured.Problems Occurred During Installation. Affected Indicators Properly Secured (← links)
- 05000443/LER-1997-016, :on 971105,determined That AMSAC C-20 Interlock Setpoint Is non-conservative.Caused by Lack of Precise Definition of Required Power Level for C-20 Interlock.Will Revise AMSAC C-20 Interlock Setpoint (← links)
- 05000443/LER-1997-016-01, Forwards LER 97-016-01 Re Event That Occurred on 971105 at Station.Ler Is Being Submitted to Retract LER 97-016-00, Which Was Determined to Be Unreportable (← links)
- 05000443/LER-1998-001, :on 980103,inadequate ECCS Venting Surveillance Occurred.Caused by Not Using Piping Isometric Drawings in Selection of Vent Points,Inappropriately Crediting Dynamic Venting of Operating Pumps.Procedures Revised (← links)
- 05000443/LER-1997-015, :on 971028,potentially non-conservative W Fuel Rod Performance Model Was Discovered.Caused by W Fuel Rod Performance Code That Is Potentially non-conservative.W Planning to Perform plant-specific Analyses (← links)
- 05000443/LER-1998-014-01, :on 981222,on Automatic Reactor Trip Occurred While at 100 Percent Power.Caused by Auxiliary Switch Linkage Pin in Breaker 163,fell Out Preventing Linkage from Actuating Auxiliary Contact.Breaker 163 Switch Reinstalled (← links)
- 05000443/LER-1998-013, :on 981214,discovered That Six Valves Were Incorrectly Omitted from Scope of IST Program.Caused by Inadequate Review of IST Program Scope.Subject Valves Will Be Repaired or Replaced Prior to Completion of Upcoming RFO (← links)
- 05000443/LER-1997-018, :on 971216,CRACS Inoperability Was Noted.Caused by Liquid Refrigerant Carryover to Suction of Compressors. Event Evaluation Team Was Formed to Investigate Cracs Compressor Failures (← links)
- 05000443/LER-1998-012, :on 981120,unanticipated Isolation of FWIVs Occurred.Caused by Personnel Error.Separate Individual Was Assigned in CR to Perform Oversight Duties During Latest Plant Heatup & Power Ascension.With (← links)
- 05000443/LER-1998-011, :on 981120,inoperable Containment Penetration Overcurrent Protective Devices Were Noted.Caused by Inadequate Preparation & Review of Design Change.Class 1E Fuses Have Been Installed.With (← links)
- 05000443/LER-1998-010, :on 981113,plant Placed in Cold Shutdown Condition Due to Degraded Generator step-up Transformer Connection.Visual Insp of Damaged Transformer Connections Performed to Determine Cause of Event.With (← links)
- 05000443/LER-1997-017, :on 971118,inadequate Ssps Surveillance Testing Was Noted.Caused by Inadequacy of Internal Logic Test Scheme of Ssps as Supplied by Vendor.Ts 4.0.3 Was Entered & Revised Ssps Sps IX1680.921 & IX1680.922 (← links)
- 05000443/LER-1996-008, :on 961212,potential Loss of Automatic Actuation of EFWS Discovered.Caused by Limiting Single Failure of B Train Ssps Was Not Considered in Design of Efws.Operability Determination Was Performed (← links)
- 05000443/LER-1996-004, :on 960627,EFWS Valve Closure Occurred.Caused by Insufficient 10CFR50.59 Refresher Training.Revised 10CFR50.59 Evaluation Procedure (← links)
- 05000443/LER-1997-006, :on 970407,determined That Potential Fuel Handling Accident in Containment Could Result in Radiological Consequences.Cause Due to non-conservative Assumptions.Evaluated CA Options (← links)
- 05000443/LER-1988-007, :on 881020,Trains a & B Cables for post- Accident Nuclear Instrumentation Identified as Separated by Less than Required 20 Ft,Per 10CFR50,App R.Mod Completed for Reinstallation of Cables (← links)
- 05000443/LER-1998-009, :on 980915,noted Incomplete Digital Channel Operation Tests (Dcots) for CR & Containment on-line Purge (COP) Rms.Caused by Development of Incomplete Sps.Revised COP Dcot Sps to Check Isolation Relays.With (← links)
- 05000443/LER-1988-002, :on 880211,supply Breaker for Inverter Not Tested in Accordance W/Requirements of Tech Spec 4.8.4.2. Caused by Breaker Not on List Which Required Testing.Breader Added to Testing Required List (← links)
- 05000443/LER-1988-004, :on 880810,vital Buses E5 & E6 Tripped on Loss of Offsite Power Causing Actuation of Diesel Generator 1A Onto Bus E5.Caused by Personnel Error.Addl Training Will Be Established (← links)
- 05000443/LER-1988-003, :on 880729,Tech Spec Action Statement Requirement Not Observed During Containment Manipulator Crane Area Radiation Monitor Surveillance Testing.Caused by Personnel Error.Surveillance Procedure Revised (← links)
- 05000443/LER-1997-011, :on 970611, a Train Containment Recirculation Sump Isolation Valve Encapsulation Tank Was Unable to Maintain Required Test Pressure.Caused by Design & Mfg Problems.Design Change Was Implemented (← links)
- 05000443/LER-1997-012, :on 970613, C SG Was Inadvertently Drained from 38% Narrow Range Level to 13% Narrow Range Level.Caused by Inadequate Coordination of SG & FW Evolutions by CR staff.FW-V48 Was Closed & C Was Refilled (← links)
- 05000443/LER-1997-008, :on 970510,automatic Reactor Trip & Feedwater Isolation Occurred.Caused by Inadequate Monitoring & Trending of Intermediate Range Channels.Improved Monitoring of IR Ni Channels (← links)
- 05000443/LER-1988-001, :on 880129,during Replacement of Relay Coil Assembly,Contacts on Relay Contact Block Were Inadvertently Depressed Causing Actuation of Control Room Emergency Air Cleanup Subsystem Fan CBA-FN-16A (← links)
- 05000443/LER-1997-007, :on 970425,discovered That Util Was Not in Compliance W/Requirements of App B to FOL for Seabrook. Caused by Lack of Commitment to Program Implementation. Established EP Program (← links)
- 05000443/LER-1997-010, :on 970605,containment Bldg Spray Penetration Check Valve Failed.Caused by Installation of Incorrect Disc Hanger in Noted Valves.Valve Discs CBS-V18 & CBS-V12 Have Been Modified (← links)
- 05000443/LER-1997-005, :on 970314,misposition of Main Steam Line Radiation Monitors Was Discovered.Caused by Human & Misjudgement Errors.Design Change Was Implemented to Relocate MSLRMs Approx 24 Inches Upstream (← links)
- 05000443/LER-1996-007, :on 961206,EFS Flow Delivery Delays Were Noted. Caused Because Requirements of W Accident Analyses Were Not Met.Operability Determination Was Completed & Accident Analyses Were Revised (← links)
- 05000443/LER-1997-004, :on 970206,remote Shutdown Sys Circuits Were Not Tested Completely.Caused by Procedural Technical Inaccuracies Resulting in Required Testing Not Performed. Operability Determination Was Completed (← links)
- 05000443/LER-1996-001, Repts That During 1996 One Challenge to Plant Pressurizer PORVs Was Identified.Description of Event in LER 96-001-00 Re Automatic RT (← links)
- 05000443/LER-1997-001, :on 970109,identified That Certain Obstructions to Flow of Flood Water Off Site May Produce Flood Levels Exceeding Elevations Specified in Fsar.Caused by Misapplication of Design Inputs (← links)
- 05000443/LER-1997-003, :on 970113,failed to Perform Surveillance Turbine Trip on Reactor Trip.Caused by Lack of Specific Testing Requirements.Verified Operability of Turbine Trip on P-4 Interlock Circuits During Plant Trip (← links)
- 05000443/LER-1997-002, :on 970128,discovered Containment Penetration Piping Overpressure Potential.Caused by Inadequate Original Design.Opened Vent Valve in SI Test Line & Sf Drain Line (← links)
- 05000443/LER-1996-010, :on 961125,response Time Testing of Main Steam Isolation & Reactor Trip Circuits Occurred.Cause of Event Not Determined.Operability Determinations for Sgpnrh & Prhpfr Have Been Completed (← links)
- 05000443/LER-1993-004, :on 930118,determined That 4 H Flow Estimate for Effluent Releases W/Flowmeter Inoperable Exceeded by 35 Minutes.Caused by Chemistry Technician Error.Technician Counseled & Event Will Be Reviewed (← links)
- 05000443/LER-1992-026, :on 920714,discovered That Three of Four Cover Bolts on Resin Sluice Discharge Valve Fractured,Resulting in Loosening of Valve Bonnet.Caused by High Matl Hardness.Bolts in Plug Valves Replaced (← links)
- 05000443/LER-1996-007-03, :on 961206,EFW Flow Delivery Delays Occurred. Caused by Error in UFSAR Chapter 15 Accident Analyses. Determination Will Be Completed After Fwlb Analyses Is Updated (← links)
- 05000443/LER-1993-003, :on 930114,automatic Reactor Trip from 100% Power Occurred Due to Phase to Ground Fault on 25 Kv Sys. Damper Assemblies Redesigned to Reduce Possibility of Blade Failure & Duct Cooling Fan Units (← links)
- 05000443/LER-1993-002, :on 930107,discovered Potential for Premature Opening of Containment Bldg Spray Sump Isolation Valves. Caused by Failure to Recognize Sys Interactions.Affected Procedures Revised & Event Reviewed (← links)
- 05000443/LER-1993-001, :on 930103,reactor Trip Initiated After Both MFW Pumps Shutdown Due to Low Suction Pressure.Caused by Incomplete Communication.Use of Digital Controls for 26 FW Heaters Will Be Evaluated (← links)
- 05000443/LER-1992-013, :on 920827,determined That Six Plant Doors Did Not Have Tornado Design to Withstand Differential Pressure, Per Updated Fsar.Caused by Failure to Include Doors in United Engineers & Constructors Spec.Updated FSAR Revised (← links)
- 05000443/LER-1992-013-01, Forwards LER 92-013-01 Re Tornado Design of Plant Doors. Submittal Documents Root Cause & Corrective Actions Ongoing at Time of LER 92-013-00 Submittal (← links)
- 05000443/LER-1992-025, :on 921213,manual Reactor Trip Initiated Due to Unavailability of Two Circulating Water Sys Pumps.Temporary Mod Installed to Allow for Continuous Manual Operation of Traveling Screens at Either Slow or Fast Speed (← links)
- 05000443/LER-1992-011, :on 920807,identified That Operability of Svc Water Cooling Tower Had Not Been Adequately Demonstrated,Per TS Surveillance Requirement 4.7.5.d.1.Caused by Inadequate Review by Licensee.Procedures Revised (← links)
- 05000443/LER-1992-019, :on 920916,determined That Procedures for Performing Delta T/Tavg Protection Channel Operational Test Inadequate Due to Lack of Complete Technical Review of I&C Procedures.Appropriate Procedures Revised (← links)
- 05000443/LER-1992-019-01, Forwards LER 92-019-01 Re Delta T/Tavg Protection Channel Operational Test,Documenting Root Cause & Corrective Actions,Per Evaluation Ongoing at Time of LER 92-019-00 Submittal (← links)
- 05000443/LER-1992-024, :on 921127,reactor Trip Occurred Due to Spurious Signal in RCS Overpower Delta T Protection Circuit.Caused by Erratic Setpoint Voltage from Circuit Card.Faulty Circuit Card Replaced (← links)
- 05000443/LER-1992-021, :on 921018,discovered Motor Circuit Breaker for Nonoperating Centrifugal Charging Pump Connected to Electrical Bus Prior to Closing & Locking Pump Discharge Valve.Caused by Operator Error (← links)
- 05000443/LER-1992-023, :on 921112 & 16,three safety-related Components,Within Scope of IST Program,Not Tested Prior to Entry Into Mode 4.Caused by Personnel & Procedure Error. Using Proper Documentation Will Be Stressed (← links)
- 05000443/LER-1992-022, :on 921110,determined That Containment Personnel Hatch Airlock Seal Leakage Surveillance Not Performed at TS-required Frequencies.Caused by Lack of Administrative Mechanism.Package Generated (← links)
- 05000443/LER-1992-016, :on 920904,determined That Results for 920904 & 05 MSSV Setpoint Test,Indicated That Nine MSSVs Outside Acceptance Criteria in TS 3.7.1.1.Caused by Metallurgical Bonding.Six of Nine MSSVs Reset (← links)
- 05000443/LER-1992-014, :on 920901,missed TS Surveillance on Seismic Monitoring Instrumentation Missed.Caused by Inadequate Communication.Operating Mgr Will Review Event W/Each Operating Crew & W/Work Control Supervisor (← links)
- 05000443/LER-1992-012, :on 920826,ESF Actuation Occurred,Causing SG Blowdown to Isolate.Caused by Personnel Failing to Follow Procedures for Surveillance Activities.Written Guidance Issued Re Specifying Function of Each Jumper (← links)
- 05000443/LER-1996-003, :on 960521,Emergency Feedwater Pump Mechanical Seal Failure Occurred.Caused by Inadequate Predictive Maintenance Techniques.Seal Replaced,Inspected & Adjusted (← links)
- 05000443/LER-1996-006, :on 960816,discovered Missed Surveillance Re Verification of Time Constant of Nis Rate Trip Circuit. Caused by Procedural Inadequacy.Revised Procedures for Performing Analog Channel Operability Test (← links)
- 05000443/LER-1988-009, :on 881208,testing Indicated That Premature Degration of RHR Pump Thrust Bearing Could Occur Which Would Reduce Bearing Design Life.Rhr Pumps Modified & Bearing Replacement Will Be Made (← links)
- 05000443/LER-1996-005, :on 960715,determined Surveillance Interval for SI-V53 Had Been Exceeded.Caused by Personnel Error.Procedure Revised to Require Independent Confirmation That Surveillance Frequency Has Been Changed (← links)
- 05000443/LER-1992-020, :on 921005,determined That 24 H Sample Interval for Train B Pcc Water Sys Taken Out of Svc on 920924 Exceeded by One H & 25 Minutes.Caused by Personnel Error. Responsible Personnel Counseled (← links)
- 05000443/LER-1992-018, :on 920915,RCP Cubicle Found W/O Controls Required by TS 6.11, High Radiation Area. Caused by Lack of Attention to Detail.Induividuals Directed to Leave Area & RWP Corrected (← links)
- 05000443/LER-1992-017, :on 920907,SG Level Oscillations Occurred in One Sg,Resulting in Overfed SG & Causing High SG Level Alarm.Caused by Incomplete Communications.Personnel Will Critique Event & Training Program Reviewed (← links)
- 05000443/LER-1992-010, :on 920703,portable Air Compressor Utilized for Sandblasting Operations Caught Fire in CR Ventilation Sys. Caused by Inadequate Procedural Guidance.Design Basis & Operability Requirements Revised (← links)
- 05000443/LER-1992-009, :on 920729,determined That 18-month Surveillance Testing Program for Reactor Trip Breakers & Reactor Trip Bypass Breakers Did Not Test Shunt Trip Circuits.Caused by Inadequate Procedure (← links)
- 05000443/LER-1992-015, :on 920902,during Walkdown for IPE for External Events,Discovered That Scupper in Svc Water Pumphouse Roof Parapet Not Covered by Roofing Matl.Cause Indeterminate. Roofing Matl Covering Scuppers Removed (← links)
- 05000443/LER-1992-008, :on 920626,determined That 18-month Surveillance Test Program for EDG Inadequately Tested Undervoltage Circuitry,Per NRC Info Notice 92-040.Caused by Misinterpretation of Testing Requirements (← links)
- 05000443/LER-1992-007, :on 920617,A Train Containment Encl Emergency Air Cleanup Sys Discovered Inoperable Due to Personnel Error.Appropriate TS Statement Entered & Inoperable Equipment Returned to Operable Status (← links)
- 05000443/LER-1992-006, :on 920612,smoke Detector in Control Room East Air Intake Actuated High Smoke Concentration Alarm.Caused by Spurious Alarm Signal Due to Adverse Environ Conditions.Work Request Initiated to Recalibr Detector (← links)
- 05000443/LER-1992-005, :on 920529,two Out of Three Pressure Code Safety Valves Failed Required Setpoint Testing.Caused by Leakage in 1 Valve & Cause Unknown in Other Valve.Valves Retested & Reworked as Needed (← links)
- 05000443/LER-1996-002, :on 960207,inadequate SG Wide Range Water Level Channel Calibrations Occurred.Caused by Lack of Design Engineering Involvement in Original Surveillance Procedure Development.Procedures Will Be Revised (← links)
- 05000443/LER-1992-003, :on 920309,determined That Integrity of Concrete Structure Which Encls Condensate Storage Tank Not Verified Once Per 12 H on 901222,910512 & 1109.Caused by Failure to Follow Procedures (← links)
- 05000443/LER-1992-004, :on 920325,discrepancy Identified W/Manner in Which Valve Closure Stroke Time Testing Performed for 20 Valcor solenoid-operated Valves.Caused by Design & Testing Inadequacies.Design Change Implemented (← links)
- 05000443/LER-1995-007, :on 951103,MSSV Setpoint Testing Failed.Reset Four MSSVs to Required Setpoint & Retested Satisfactorily at Plant (← links)
- 05000443/LER-1995-006, :on 951030,unit Operated Above Maximum Thermal Power Level.Caused by Inadequate Procedure That Did Not Ensure That re-normalization Was Considered After Transmitter Recalibration.Revised Procedures (← links)
- 05000443/LER-1995-005, :on 950731,util Failed to Comply W/Action Requirements in TS 3.3.1.Caused by Inadequate Job Scoping of Ni Calibr Work Package.Ceased All TS Related Work Removed from Refueling Outage to non-outage Period (← links)
- 05000443/LER-1991-003, :on 910416,instrument Root Isolation Valve for Two non-safety Class Pressure Instruments Unlocked Causing Valve to Become Mispositioned Due to Inadequate Procedure. Valve Locked & Procedure OS1005.05 Revised (← links)
- 05000443/LER-1992-001-01, :on 920129,auxiliary Sample Pump Not Operating as Indicated by Lack of Sample Flow.Caused by Equipment Failure.Cooling Fan Connection Was Corrected & Procedure Change Will Be Submitted (← links)
- 05000443/LER-1995-004, :on 950630 & 0701,non-compliance W/Tech Spec Surveillance Requirements for Inoperable Afd Monitor Alarm Occurred.Caused by Personnel Error.Afd Monitored & Logged on Hourly Basis (← links)
- 05000443/LER-1995-002, :on 950618,manual Reactor Trip Initiated After Power Lost to Both Turbine EHC Pumps.Caused by Inadequate Design for 13.8 Kv non-safety Related Transformer.Trip Critical Transformers Replaced (← links)
- 05000443/LER-1991-012, :on 910927,multiple ESFs Associated W/Train a Actuated Upon Receipt of Inadvertent Safety Injection Signal for Train A,Resulting in Start of Edg.Caused by Personnel Error.Procedure Changes Initiated (← links)
- 05000443/LER-1991-001-01, :on 910810,source Range Neutron Flux Audible Monitors Discovered Inoperable.Caused by Personnel Error. Request for Engineering Svcs Initiated to Evaluate Feasibility of Design Change (← links)
- 05000443/LER-1991-006, :on 910602,turbine Generator Trip W/Subsequent Reactor Trip Occurred at 100% Power,Due to Actuation of Turbine Mechanical Overspeed Protection Sys.Caused by Corrosion in Valve Body.Valve Replaced (← links)
- 05000443/LER-1991-005, :on 910529,discovered That Circuit Breaker Feeding Rod Control Cluster Change Fixture Unlocked Since 910514.Caused by Personnel Error.Breaker Immediately Padlocked & Design Change Initiated (← links)
- 05000443/LER-1994-019, :on 940124,voluntary LER for Electrical Relay Failures Occurred.Caused by Damaged Roller Bearings on Relay Coil Assembly.Replaced All Installed GE Hea Relays W/Electroswitch LOR-1 (← links)
- 05000443/LER-1994-018, :on 941128,missed TS Sr.Caused by Lack of Alarm Response Procedure for Rod Deviation Monitor Inoperable Alarm & Misunderstanding of Rod Position Data as Presented by Mpcs.Response Procedure Will Be Developed (← links)
- 05000443/LER-1994-017, :on 941102,insp of Cooling Basin Revealed Two Degraded Column Flange Bolts on Cooling Tower Svc Water Pump 1SW-P-110A.Caused by Bolt Mfg Failure to Perform Adequate Heat Treatment.Suspect Bolting Matl Replaced (← links)
- 05000443/LER-1991-008, :on 910627,turbine Trip W/Reactor Trip Occurred Due to Inadvertent Actuation of Switchyard Circuit Breakers. Caused by Manufacturing Error.Relay Housing for Relay Replaced During First Refueling Outage (← links)
- 05000443/LER-1994-016, :on 941019,noncompliance W/Ts 3.3.2 Action Requirements Noted.Caused by Acceptance of Inappropriate TS Reuqirements Re Emergency Bus UV Protection.Technical Clarification TS-059 Has Been Revised (← links)
- 05000443/LER-1994-010, :on 940603,identified Portions of RCP Turning Vane Cap Scew (Tvcs) & Two Tvcs Locking Cups in Rv.Original Equipment Design Did Not Adequately Consider Flow Induced Vibration of Locking Cup.Tvcss Replaced (← links)
- 05000443/LER-1991-009, :on 910704,reactor Trip W/Turbine Generator Trip Occurred.Caused by Low Flow in RCS Due to Bolt Missing from Top Access Cover Plate.Gaskets & Bolts Replaced & Insp of Addl Cover Plates Performed (← links)
- 05000443/LER-1994-015, :on 940909,missed TS 4.0.5 Surveillance on Ms Drain (Msd) Valves Due to Inadequate Procedure.Msd Valve Stroke Tests Performed & Procedures Governing Repetitive Task Sheets Will Be Revised (← links)
- 05000443/LER-1991-007, :on 910615,actuation of Control Room Emergency Air Cleanup & Filtration Subsystems Occurred.Caused by Personnel Error Due to Lack of Attention to Detail.Event Will Be Discuss W/Respective Operating Crews (← links)
- 05000443/LER-1991-002, :on 910330,manual Reactor Trip Initiated Due to Turbine Runback Coincident W/Loss of Condenser Steam Dump Valve & Electrical Fault Occurred in Substation.Caused by Loss of Vital Bus.Transformer Replaced (← links)
- 05000443/LER-1994-011, :on 940621,contractor Mechanic Entered High Radiation Area W/O Possessing Alarming Dosimetry.Caused by Failure to Implement Self Checking.Radiation Worker Training Will Be Revised (← links)
- 05000443/LER-1994-014, :on 940724,discovered That Containment Equipment Hatch Air Lock Seal Leakage Surveillance Had Not Been Performed as Required by Ts.Caused by Inadequate Tracking Mechanism.Revised Lock Surveillance (← links)
- 05000443/LER-1994-013, :on 940515,determined That Both Trains of Fuel Storage Bldg Emergency Air Cleaning Sys Inoperable Since 940509 Due to Inadequate Review of Associated Work Request. Work Request Procedure Will Be Revised (← links)
- 05000443/LER-1994-012, :on 940714,requirements of TS 6.11, High Radiation Area Not Complied With.Caused by Failure to Implement Self Checking on Part of Test Control Engineer. Individual Escorted from Containment Bldg (← links)
- 05000443/LER-1994-009, :on 940504,SIP Had Potential to Exceed run-out Flow Rate,Hence Resulting in SIPs Becoming Inoperable.Caused by Loss of SIPs During Hot Leg.Rebalanced Hot Leg Recirculation Flow (← links)
- 05000443/LER-1994-006, :on 940317,determined That Reportable Condition Existed Involving Tornado Design of Dampers,Ductwork & Metal Partitions.Cause Was Oversight in Design.Corrective Action: North Atlantic Has Completed Evaluation (← links)
- 05000443/LER-1991-001, :on 910212,turbine-generator Trip W/Reactor Trip Occurred.Caused by Inadequate Procedure.Plant Placed in Hot Standby.Human Performance Evaluation Sys & Root Cause Analysis Initiated (← links)
- 05000443/LER-1994-007, :on 940510,discovered High Radiation Area Barrier Repositioned Which Allowed Access Into VCT Area W/O Proper Controls Due to Personnel Error.Barrier Immediately Repositioned Across Entrance to VCT Room (← links)
- 05000443/LER-1994-001, :on 940125,reactor Trip & Safety Injection Occurred Due to Inadvertent MSIV Closure.Caused by Contaminated Hydraulic Fluid,Sticking Main Dump Valve & Related Hardware Issues (← links)
- 05000443/LER-1990-026, :on 901116,ESF Actuation Occurred,Causing Control Room Normal Makeup Air Control Subsystem to Transfer to Control Room Emergency Air Cleanup Sys.Caused by Personnel Error.Technician Counseled (← links)
- 05000443/LER-1990-025, :on 901109,reactor Trip Due to Steam Generator low-low Level Signal Occurred (← links)
- 05000443/LER-1994-002, :on 940210,determined Method for Performing Slave Relay Test Valve Did Not Satisfy Ts.Caused by Omission of Relevent Information from Surveillance Procedures. Procedures Revised (← links)
- 05000443/LER-1994-001-01, :on 940125,reactor Trip & Safety Injection Occurred Due to Inadvertent MSIV Closure.Caused by Hydraulic Fluid Contamination,Sticking Main Dump Valve & Related Hardware Issues.Msivs Disassembled & Inspected (← links)
- 05000443/LER-1994-004, :on 940224,TS 4.3.3.10 Surveillance Requirement Performed Monthly Missed.Caused by Inadequate Method to Track Ts.Maint Procedures Revised (← links)
- 05000443/LER-1994-003, :on 940217,determined That MSSV Setpoint Testing Conducted in Sept 1992 Reportable Per 10CFR50.72(b)(1)(ii)(A) & (B) Due to Insufficient UFSAR Loss of Load/Turbine Trip Analysis (← links)
- 05000443/LER-1993-021, :on 931117,control Room Emergency Air Cleanup & Filtration Subsystem Became Inoperable Due to Equipment Failure.Replaced Train B Emergency Filtration Heater W/Train a Emergency Filtration Unit (← links)
- 05000443/LER-1990-024, :on 901102,actuation of Control Room Emergency Air Cleanup & Filtration Subsystem Occurred (← links)
- 05000443/LER-1990-023, :on 900927,noncompliance W/Tech Spec Occurred in Unsecured High Radiation Area (← links)
- 05000443/LER-1990-022, :on 900822,reactor Trip Occurred Due to Loss of Voltage on Electrohydraulic 24-volt Dc Bus.Cause Not Determined.Electrohydraulic Control Maint Activity Will Be Reviewed on Case by Case Basis Prior to Work (← links)
- 05000443/LER-1993-019, :on 931005,discovered That Seldom Used Elevator Which Accesses Train B RHR Vault Not Posted W/Required Caution...Radiation Area Sign Due to Procedure Inadequacy. Applicable RP Procedures Will Be Revised (← links)
- 05000443/LER-1993-022, :on 931219,discovered Inadequate Overtemp Delta & Overpower Delta Channel Checks.Caused by Inadequate Technical Review.Corrective Actions Taken to Perform Channel Check on 4 Delta T Channel (← links)
- 05000443/LER-1990-020, :on 900801,door Leading to High Radiation Area Discovered Unsecured.Caused by Personnel Error Involving Lack of Attention to Detail.Intrusion Alarm Switch,Door Latch & Closure Mechanism Adjusted (← links)
- 05000443/LER-1990-021, :on 900801,discovered That Group a Pressurizer Backup Heaters Could Not Be Manually Energized from Main Control Board.Caused by Incorrect Cable Termination Diagram. Design Change to Correct Diagram Initiated (← links)
- 05000443/LER-1990-019, :on 900721,discovered That Time Limitation of Tech Spec 3.8.4.1 Exceeded by Nearly 7 H.Caused by Personnel Failure to Follow Procedures.Root Cause Analysis & Enhancement Sys Evaluation Initiated (← links)
- 05000443/LER-1993-018, :on 930922,RT Occurred Due to Inadequate Electrical Contact.Replaced Exciter Brush & Rotor (← links)
- 05000443/LER-1993-017, :on 930914,determined That Configuration Entered During Performance of Check Valve Testing,Per Procedure OX1416.04 Represented Condition Prohibited by Ts. Caused by Procedural Inadequacy.Procedure OX1416.04 Revised (← links)
- 05000443/LER-1993-015, :on 930908,determined That Procedures for Performing EDG TS SR 4.8.1.1.2 a.5 Did Not Verify That Engine Speed Was at Least 514 RPM Due to Oversight in Development of Sr.Lar Submitted (← links)
- 05000443/LER-1993-016, :on 930909,identified Condition That Could Have Prevented Fulfillment of Safety Function of EFW Sys Under Certain Design Basis Meteorological Conditions.Root Cause of Event Under Investigation (← links)
- 05000443/LER-1993-014, :on 930824,Channel Check Requirements for TS 4.3.2.1,Table 4.3-2,Functional Unit 8.b Not Satisfied for RWST Transmitters.Cause Not Determined.Performed Tadot on RWST Transmitters (← links)
- 05000443/LER-1990-018, :on 900705,reactor Trip W/Turbine Trip Occurred.Caused by Contact Closure of Electrohydraulic Control Oil Pressure Switches Satisfying Two Out of Three Logic.Pressure Switches Relocated (← links)
- 05000443/LER-1990-015, :on 900620,turbine Trip W/Reactor Trip Occurred Due to Ground Fault Relay Actuation (← links)
- 05000443/LER-1993-020, :on 931020,determined Voltage Frequency Recorders Used for Performing TS Inadequate.Caused by Inadequate Review of Test Instrumentation Response Characteristics.Verified Voltage & EDGs (← links)
- 05000443/LER-1993-007, :on 930512,electrical Circuits Containing Circuit Protective Devices Were Not Analyzed to Function During Environ Excursions.Caused by Failure to Effectively Communicate.Design Change Will Be Developed (← links)
- 05000443/LER-1993-012, :on 930727,RT Due to Electrical Fault in Solid State Protection Sys Cabinet.Replaced Lamp Test Socket & Circuit Driver Card (← links)
- 05000443/LER-1993-006, :on 930401,Train a Cooling Tower Pump Discharge Valve Could Not Be Fully Closed Utilizing Motor Operator Attached to Valve.Caused by Corrosion Product Buildup.Valve Returned to Operable Status (← links)
- 05000443/LER-1990-017, :on 900630,discovered That Requirements of Tech Spec 6.11, High Radiation Area, Not Met.Caused by Personnel Error.Operator Counseled Re Consequences of Event & Need for Increased Attention to Detail (← links)
- 05000443/LER-1990-016, :on 900624,ESF Actuation Occurred Resulting in Containment Ventilation Isolation.Caused by Personnel Error. More Descriptive Labels on Inverters & Power Panels & One Line Drawings to Be Placed on Inverters (← links)
- 05000443/LER-1993-011, :on 921219,930209 & 0415,SW Pumps SW-P-41B, SW-P-41B & SW-P-41D Declared Inoperable,Respectively Due High Vibration.Caused by Excessive Abrasive Particles in Ocean Water.Pumps Replaced (← links)
- 05000443/LER-1993-008, :on 930518,determined That Control Air Not Analyzed to Function During Seismic Event Due to Lack of Understanding Significance of Control Air Availability for Long Term DG Operation.Ufsar Will Be Updated (← links)
- 05000443/LER-1993-002-01, Forwards LER 93-002-01 Re Potential Premature Opening of Containment Bldg Spray Sump Isolation Valves (← links)
- 05000443/LER-1993-009, :on 930520,manual Reactor Trip from 100% Power Initiated When MSIV Closed During Quarterly Testing, Resulting in Feedwater & Two Emergency Feedwater Isolations. Caused by Debris in Valves.Valves Replaced (← links)
- 05000443/LER-1993-010, :on 930522,SG Level Oscillations Occurred in One SG Resulting in SG Being Overfed & Causing high-high SG Water Level.Caused by Personnel Error.Power Reduced to Approx 2.5% & FW to SGs Restored (← links)
- 05000443/LER-1990-014, :on 900612,discovered That Sample Pump for Steam Generator Blowdown Flash Tank Drain Radiation Monitor Not Running.Caused by Suspended Solids in Steam Generator Blowdown Sys.Solids Cleared from Flow Switch (← links)
- 05000443/LER-1990-013, :on 900419,discovered That Containment Personnel Hatch Unsecured for Approx 28 H.Caused by Installation of Locking Plate Upside Down & Placing Lock Through Only 1 Eyelet.Instructions Posted (← links)
- 05000443/LER-1990-012, :on 900402,transmitter Failed to Provide Pressure to Reactor Protection Sys Due to Closed Isolation Valve.Caused by Failure to Identify Valve in Procedures. Valves Manipulated to Correct Positions (← links)
- 05000443/LER-1990-011, :on 900306,actuation of Control Room Emergency Air Cleanup & Filtration Subsystem Occurred.Caused by Failure of Geiger-Muller Tube.Monitor Removed from Svc & Tube Replaced (← links)
- 05000443/LER-1993-005, :on 930318,two Accumulator Isolation Valves & Selected ECCS Valves Had Power Restored to Operator While Performing Miscellaneous Valve Stroke Surveillance.Caused by Personnel Error.Mccs E522 & E622 Deenergized (← links)
- 05000443/LER-1990-009, :on 900213,seal Leak Test Surveillance Not Performed.Caused by Onshift Operator Not Aware Leak Test Required Following Opening of Air Lock.Equipment Hatch Air Lock Tested Satisfactory (← links)
- 05000443/LER-1989-015, :on 890429,while Shifting Centrifugal Charging Pump a to Pump B,Both Pumps Operated for Approx 8 S,Contrary to Surveillance Requirement 4.1.2.3.2.Caused by Personnel Missing Step in Procedure.Procedure Revised (← links)
- 05000443/LER-1990-005, :on 900203,actuation of Control Room Emergency Air Cleanup & Filtration Subsystem Occurred.Caused by Failed Radiation Monitor Due to Mechanical Binding of Check Source. Monitor Returned to Operable Status (← links)
- 05000443/LER-1991-004, :on 910401,steam Generator Indicated That Valve Was Not Opening Properly During Plant Restart.Caused by Differential Pressure Across Dash Plate.Dash Plate Machining Performed on Valves to Prevent Valve Disk (← links)
- 05000443/LER-1990-010, :on 900305,actuation of Control Room Emergency Air Cleanup & Filtration Subsystem Occurred.Caused by Moisture in Detector Housing.Air Intake Monitors Cleaned & Desiccant Placed in Housing (← links)
- 05000443/LER-1990-007, :on 900208,when Source Check Removed from Control room,RM-6506B Entered High Alarm Condition,Causing ESF Actuation of Emergency Air Cleanup Sys.Caused by Mechanical Binding.Check Source Replaced (← links)
- 05000443/LER-1990-008, :on 900209,latching Mechanism for Door Entering Containment Encl Bldg Failed,Rendering Emergency Air Cleanup Sys Inoperable.Plant Cooldown Initiated,Latching Mechanism Repaired & Door Returned to Svc (← links)
- 05000443/LER-1990-006, :on 900206,Train a Radiation Monitor Went Into High Alarm Condition,Resulting in Actuation of Control Room Emergency Air Cleanup & Filtration Subsystem.Caused by Mechanical Binding.Detector Tube Remounted (← links)
- 05000443/LER-1990-003, :on 900116,wide-range Gas Monitor Low Range Pump Found Inoperable.Caused by Failed Pump Diaphragm Weakened by High Flow Condition.Ruptured Pump Diaphragm Replaced & Pump Returned to Normal Operations (← links)
- 05000443/LER-1990-001, :on 900109,wide Range Gas Monitor Low Range Pump Found to Be Inoperable,Resulting in Noncompliance W/ Tech Specs.Caused by Regulator Isolation Valves Being Left in Open Position.Walkdown of Skids Conducted (← links)
- 05000443/LER-1990-002, :on 900109,discovered That Auxiliary Sample Pump Used to Satisfy Action Requirements of Tech Spec Was Not Operating.Caused by Dislodged Power Fuse.Pump Relocated & Caution Tape Installed to Protect Pump (← links)
- 05000443/LER-1989-014, :on 891129,auxiliary Transformer Supply Breaker to Vital Bus E5 Tripped When Remote Manual Override Relay Energized.Caused by Procedure Inadequacies in Procedure 0S1048.01.Procedure Revised (← links)
- 05000443/LER-1989-013, :on 891023,discovered That Monitor Used to Satisfy Requirements of Tech Spec 3.3.3.1,Action 27 Had Been Unplugged.Caused by Personnel Error.Individual Counseled & Meeting Held W/Health Physics Technicians (← links)
- 05000443/LER-1989-012, :on 891011,one of Two Suction Valves on RHR Train a Pump Closed,Causing Loss of All RHR Cooling Capability.Caused by Procedure Inadequacies.Procedure Revised to Specify Sequence of Restoration (← links)
- 05000443/LER-1989-011, :on 890905,determined That Three Piping Penetrations in Condensate Storage Tank Encl Not Sealed.Root Cause Under Investigation.Penetrations Sealed & Tech Specs Surveillance Log Revised (← links)
- 05000443/LER-2018-003, Overpower Delta T Setpoint Exceeded Allowable Value for Time Longer than Permitted by the Technical Specifications (← links)
- 05000443/LER-2018-002, Automatic Valve in Emergency Core Cooling System Inoperable (← links)
- 05000443/LER-2018-001, Re Pressurizer Safety Valve Outside of Technical Specification Limits Discovered During As-Found Set Point Testing (← links)
- 05000443/LER-1917-001, Regarding Manual Reactor Trip in Response to a Feedwater Isolation Due to High Level in Steam Generator B (← links)
- 05000443/LER-2016-001, Regarding Automatic Reactor Trip Due to Turbine Trip (← links)
- 05000443/LER-2016-002, Regarding Emergency Feedwater System Actuation on Steam Generator Low-Low Level (← links)
- 05000443/LER-2014-002, Regarding Reactor Coolant Pump Undervoltage Time Delay Relays Exceed Acceptance Criteria (← links)
- 05000443/LER-2014-001, Regarding Automatic Reactor Trip Due to Delay in Automatic Bus Transfer Resulting in RCP Loop Low Flow (← links)
- 05000443/LER-2013-001, Regarding Failure to Enter Technical Specification Following Discovery of SW Leak (← links)
- 05000443/LER-2012-005, Regarding Service Water Cooling Tower Low Water Level (← links)
- 05000443/LER-2012-004, Regarding Manual Actuation of the Service Water Cooling Tower (← links)
- 05000443/LER-2012-003, Regarding Reactor Trip Due to Circuit Board Failure That Closes Feed Regulating Valve (← links)
- 05000443/LER-2012-002, Regarding Inadequate Testing of Response Time for Reactor Trip Breakers (← links)
- 05000443/LER-2012-001, Regarding Inadequate Testing of Certain Emergency Feedwater Actuation System Relays (← links)
- 05000443/LER-2011-003, Offsite AC Source Inoperable During Diesel Generator Operation (← links)
- 05000443/LER-2011-002, For Seabrook Station, Regarding Automatic Reactor Trip Following Loss of Main Feed Pump (← links)
- 05000443/LER-2011-001, For Seabrook Station, Regarding Noncompliance with Technical Specifications for Leakage Detection Instruments (← links)
- 05000443/LER-2010-002, For Seabrook Station, Regarding Containment Penetration Protective Devices Found Inoperable (← links)
- 05000443/LER-2010-001, For Seabrook Station, Emergency Air Cleanup System Inoperable Due to Opening in Boundary (← links)
- 05000443/LER-2009-001, Reactor Protection System on Steam Generator Low Water Level (← links)
- 05000443/LER-2008-001, Regarding Plant Trip Due to 345kV Bus Fault (← links)
- 05000443/LER-2007-001, Transmittal of LER 2007-S01-00, for Seabrook Station Regarding Loss of Control of Safeguards Information at a Contract Company (← links)
- 05000443/LER-2007-002, Regarding Incorrect Valve Stroke Time Renders Emergency Feedwater Pump Inoperable (← links)
- 05000443/LER-2006-006, Regarding Plant Shutdown Due to Inoperable Emergency Diesel Generators (← links)
- 05000443/LER-2006-005, Regarding Technical Specification Violation with Inoperable Main Steam Isolation Valve (← links)
- 05000443/LER-2006-004, Regarding Technical Specification Violation Due to Inoperable Battery Charger (← links)
- 05000443/LER-2006-003, Re Voluntary LER for Deficient Hydrostatic Barriers (← links)
- 05000443/LER-2006-002, Re Noncompliance with the Requirements of Technical Specification 6.8.1.2.a (← links)
- 05000443/LER-2006-001, Regarding Inadequate Pre-employment Screening Results in Unauthorized Access (← links)
- 05000443/LER-2005-008, Regarding Technical Specification Violation Due to Inoperable Instrument Bus Inverter (← links)
- 05000443/LER-2005-007, Re Noncompliance with the Technical Specifications Due to Circuit Card Failure (← links)
- 05000443/LER-2005-006, Manual Reactor Trip Due to Main Turbine High Vibration (← links)
- 05000443/LER-2005-005, Re Reactor Protection System Actuation on Low Steam Generator Low Level in Mode 6 (← links)
- 05000443/LER-2005-003, Regarding Plant Shutdown Due to Inoperable Reactor Trip Breaker (← links)
- 05000443/LER-2005-004, Regarding Noncompliance with the Technical Specification for Offsite AC Sources (← links)
- 05000443/LER-2005-002, Regarding Momentary Loss of Power to Emergency Bus While Transferring Power Supplies (← links)
- 05000443/LER-2005-001, Regarding Noncompliance with the Requirements of Technical Specification 3.6.3 (← links)
- 05000443/LER-2004-003, Regarding Fire Scenario Results in Unanalyzed Condition-Potential Loss of Charging (← links)
- 05000443/LER-2004-002, Regarding Accident Monitoring Instrumentation Inoperable Due to Recorder Malfunction (← links)
- 05000443/LER-2004-001, For Accident Monitoring Instruments Inoperable Due to Inadequate Indicating Range (← links)
- 05000443/LER-2003-002, Regarding Reactor Trip Following the Loss of a Main Feed Pump (← links)
- 05000443/LER-2003-001, From Seabrook Station Regarding Non-Compliance with Requirements of TS 3.8.1.1 Action B (← links)
- 05000443/LER-2002-002, Re Non-Compliance with Requirements of TS 3.8.1.1 Action B (← links)
- 05000443/LER-2002-001-01, Reactor Trip Due to Digital Rod Position Indication Card Failure (← links)
- 05000443/LER-2024-002, Manual Reactor Trip Due to B MFP Trip (← links)
- 05000443/LER-2025-001, Erratic Potentiometer Caused Upper Detector Flux Deviation Which Exceeded Technical Specification Allowed Outage Time (← links)