Pages that link to "05000352/LER-2008-001, Regarding Core Alteration with Source Range Monitor Inoperable"
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The following pages link to 05000352/LER-2008-001, Regarding Core Alteration with Source Range Monitor Inoperable:
Displayed 8 items.
- 05000352/LER-2008-001 (redirect page) (← links)
- 05000352/LER-2001-002 (← links)
- 05000352/LER-2001-001 (← links)
- 05000352/LER-1995-003, Forwards LER 95-003 Re Unit 1 Maximum Power Level of 100% Was Exceeded by Approx 3.4% (← links)
- 05000352/LER-1984-006, Forwards LER 84-006-00 Re Automatic Isolation of Main Control Room Ventilation Sys on 841113.Event Occurred Prior to Initial Criticality (← links)
- 05000352/LER-1995-007, Forwards LER 95-007,discussing Condition Prohibited by TS Due to Personnel Error (← links)
- 05000352/LER-1987-066, Forwards LER 87-066-00,correcting Date of Rept from 870107 to 880107 (← links)
- 05000352/LER-1999-003, Forwards LER 99-003-00,re Rps,Pcrvics Actuations.Ler Contains Special Rept Info for HPCI & Reactor Core Isolation Cooling Sys Injections Into Rv (← links)
- 05000352/LER-1997-009, Forwards LER 97-009-00 Which Documents Event That Occurred at Lgs,Units 1 & 2 on 971015 (← links)
- 05000352/LER-1997-010, Forwards LER 97-010-00 Re Condition Outside Design Basis Involving Suppression Chamber Steam Bypass Leakage Path, Which Occurred on 841026 & 890812 (← links)
- 05000352/LER-1999-004, Forwards LER 99-004-00,re Inoperability of Automatic Depressurization Sys Portion of Eccs.Condition Resulted from Incomplete Impact Review of Isolating Portion of ADS Nitrogen Backup Supply on Operability of ECCS Sys (← links)
- 05000352/LER-1997-008, Forwards LER 97-008-00 Which Reports Event That Occurred on 841026 Re Failure to Perform Annual Maint Insps of Portable Fire Extinguishers IAW NFPA 10 (← links)
- 05000352/LER-2024-003, Core Operating Limits Report Thermal Limit Exceeded for Unit 1 Fuel Bundle GGK123 (← links)
- 05000352/LER-2024-002, Invalid Actuation Due to a Trip of 1B Reactor Protection System Circuit Breaker (← links)
- 05000352/LER-2024-001, Leakage for the Unit 1 `B Outboard Main Steam Isolation Valve Exceeded Technical Specification Limit (← links)
- 05000352/LER-2023-001, Emergency Diesel Generator Lube Oil Pressure Sensing Line Leak Resulting in a Condition Prohibited by Technical Specifications (← links)
- 05000352/LER-2022-001, Regarding HPCI Inoperable Due to Inadvertent Isolation Signal (← links)
- 05000352/LER-2021-001, HPCI Inoperable Due to Remote Shutdown Panel Switch Failure (← links)
- 05000352/LER-2020-001-01, Valid Automatic Actuation of the Reactor Protection System with the Reactor Critical Due to Closure of One Main Steam Isolation Valve (← links)
- 05000352/LER-2020-002, Re RCIC Were Not Un-Isolated During Startup Resulting in Technical Specification Violations (← links)
- 05000352/LER-2020-001, Valid Automatic Actuation of Reactor Protection System with Reactor Critical Due to Closure of One Main Steam Isolation Valve (← links)
- 05000352/LER-1998-010, :on 980526,identified Two Surveillance Tests Associated W/Rc Recirculation Sys Flow Units A/C & B/D Calibr,Respectively.Caused Attributed to Personnel Error. Units Satisfactorily Tested (← links)
- 05000352/LER-1998-008, :on 980429,discovered Pressure Setpoint Drift of Five Main Steam Sys Srvs.Caused by Corrosion Induced Bonding.Replaced Fourteen SRV Pilot Valves W/Calibr Spares During 1R07 & Util Is Evaluating three-stage SRV Design (← links)
- 05000352/LER-1998-008-01, Forwards LER 98-008-01 Re Pressure Setpoint Drift of Thirteen Main Steam Sys SRVs Primarily Caused by Corrosion Induced Bonding within SRVs (← links)
- 05000352/LER-1998-011, :on 970901,1B RHR Pump Was Inoperable Due to Intermittent Min Flow Valve Closures.Caused by Failed Rosemount 510DU Trip Unit.Failed Trip Unit Was Replaced (← links)
- 05000352/LER-1997-011, :on 971025,HPCI Sys Was Rendered Inoperable Due to Closing Turbine Exhaust Line Pciv.Caused by Valve failure.HV-055-1F072 Torque Switch Setting Was Increased within Analyzed Limits (← links)
- 05000352/LER-1997-011-01, Forwards LER 97-011-01,re Condition Prohibited by TS in That There Was Not Enough Assurance That Valve Would Continue to Meet TS Required Stroke Time When Restoring Valve to Operable Status.No New Commitments Made within Ltr (← links)
- 05000352/LER-1998-009, :on 841026,noted That Primary Containment Overcurrent Protection Circuits May Not Have Provided Redundant Protection.Caused by Original Licensing Basis Interpretation.Corrected Affected Subject Circuits (← links)
- 05000352/LER-1998-003, :on 980213,ESF Actuation Due to Incidental Contact W/Rv Instrument Rack Occurred.Caused by Personnel Error.Counseled Individual Involved & Training for Site Personnel (← links)
- 05000352/LER-1989-017, :on 890302,drywell H Mixing Sys Low Air Flow Elements Not in Compliance W/Environ Qualification Requirements.Caused by Failure of Architect/Engineer to Transfer Info Re Revised Environ Qualification (← links)
- 05000352/LER-1989-009, :on 890331,determined That One Channel of Secondary Containment Isolation Sys,Standby Gas Treatment Sys,Reactor Encl Recirculation Sys & NSSS Sys Inoperable. Caused by Personnel Error.Procedure Revised (← links)
- 05000352/LER-1988-031, :on 881006,determined That Plant Not in Compliance W/Fire Protection Evaluation Rept.Caused by Misunderstanding & Misapplication of Detailed Regulatory Requirements.Fire Watch Patrol Established (← links)
- 05000352/LER-1989-018, :on 890304,emergency Svc Water Pump C Started Twice During Installation of Mod & All Sys Actuated. Caused by Personnel Communication Error.Pump Secured & Declared Inoperable.Personnel to Be Counseled (← links)
- 05000352/LER-1989-051, :on 890831,control Room Emergency Fresh Air Supply Sys Inadvertently Secured from Chlorine Isolation Mode of Operation,Causing Sys Inoperability.Caused by Personnel Error.Isolation Manually Initiated (← links)
- 05000352/LER-1989-026, :on 890419,four Emergency Diesel Generators Inoperable.Caused by Deficiencies in Physical Separation Between Class 1E Internal Wires & Internal Nonclass 1E Wires.Wrapping of Appropriate Wires Initiated (← links)
- 05000352/LER-1989-011-01, :on 890205,determined That Leakage Rates for Main Steam Line D Isolation Valves Exceeded Limits.Caused by Minor Wear of Valve Discs & Valve Seating Surfaces.Maint Request Forms Initiated to Repair D Valves (← links)
- 05000352/LER-1989-030, :on 890505,determined That Portion of Radiological Environ Monitoring Program Not Conducted in That Milk Samples No Longer Available from Farm.Caused by Personnel Error.New Station to Be Added (← links)
- 05000352/LER-1998-007, :on 980422,discovered Three Itt Barton Model 580A Differential Pressure Switches Inoperable.Caused by Misapplication.Replaced Subject Itt Barton Differential Pressure Switches in safety-related Applications (← links)
- 05000352/LER-1989-050, :on 890825,RCIC Sys Declared Inoperable Because No Alignment Pins Installed in Pump.Caused by Lack of Clarity in RCIC Pump Installation Instructions.Engineering Review Performed (← links)
- 05000352/LER-1989-027, :on 890423,Tech Specs Violated.Caused by Mispositioned Reactor Vessel Boundary Valve During Performance of Local Leak Rate Test Causing Draining of 400 Gallons of Reactor Vessel Inventory (← links)
- 05000352/LER-1989-022, :on 890330,discovered Physical Separation Deficiency Between Class 1E Div Cables Exiting Cable Gutter & in Nearby Cable Tray.On 890401,determined That Both Trains of Control Room Fresh Air Sys Deficient (← links)
- 05000352/LER-1989-044, :on 890629,reactor C High Level Monthly Channel Functional Surveillance Test Not Performed within Required Time Interval.Caused by Personnel Error.Surveillance Test Program Personnel Counseled (← links)
- 05000352/LER-1989-029, :on 890427,main Control Room Received High Toxic Chemical Concentration Alarm on Vinyl Chloride & Chlorine Mode of Isolation Manually Initiated.Caused by Mineral Spirits from Painting.Painting Stopped (← links)
- 05000352/LER-1989-028, :on 890424,reactor Encl Ventilation Sys Inoperable Beyond Tech Spec Limits.Caused by Tavis Corp Providing Incorrect Info About Actions Needed to Ensure That Transmitters Operated within Required Accuracy (← links)
- 05000352/LER-1989-043, :on 890628 & 29,refuel Floor HVAC Sys Isolated Due to Inadequate Differential Pressure Between Outside & Refuel Floor Atmospheres.Caused by Procedural Deficiency. Secondary Containment Isolation Switches Reset (← links)
- 05000352/LER-1989-008, :on 890126,various Plant Sys Inoperable Due to Deficiencies in Physical Separation Between Class 1E & non-Class 1E Cables & Different ESF Divs.Caused by Inadequate Procurement Spec.Panels Deenergized (← links)
- 05000352/LER-1988-042, :on 881223,inoperability of Plant Sys Due to Unacceptable Physical Separation Between safety-related Cabling Determined.Caused by Personnel Error.Plant Procedure Will Incorporate Consolidated Open Items List.W/Undated Ltr (← links)
- 05000352/LER-1989-016, :on 890228,manual ESF Actuation of Refuel Secondary Containment Isolation & Standby Gas Treatment Sys Occurred.Caused by Fuel Pin Dropped During Fuel Reconstitution Activities.Fuel Pin Retrieved (← links)
- 05000352/LER-1989-002, :on 890104,determined That Fire in Certain Areas of Plant Could Result in Unavailability of RCIC Sys Due to Insufficient Protection of Control & Power Cables. Caused by Personnel Error.Fire Watch Posted (← links)
- 05000352/LER-1989-049, :on 890815,verified Positive Crankcase Pressure Indication After Annunciation of Low Crankcase Vacuum Alarm. Cause Unknown.Investigation Into Positive Crankcase Pressure Initiated (← links)
- 05000352/LER-1989-014, :on 890216,isolation of Refuel Floor Secondary Containment & Initiation of Standby Gas Treatment Sys,Esf Occurred.Caused by Boiler Malfunction.Auxiliary Operator at Auxiliary Boiler Encl Restored Three Boilers (← links)
- 05000352/LER-1989-024, :on 890407,craftsman Removed Packing from Wrong Valve Creating Potential for Draining Reactor Vessel.Caused by Failure to Interpret Info Provided on Maint Request Form. Leak Isolated (← links)
- 05000352/LER-1988-019, :on 880506,17 Agastat Relays Found W/Missing or Unsecured Locking Springs.Caused by Inadvertent Dislodging During Work Activities in Relay Cabinets.Memo & Surveillance Test Written for Future Ref (← links)
- 05000352/LER-1989-048, :on 890801,various Primary & Secondary Containment Isolation Valves Received Isolation Signals. Caused by Instrumentation & Control Technician Error.Trip Signal & Associated Isolations Reset (← links)
- 05000352/LER-1989-025, :on 890405,physical Separation Deficiencies Between Redundant Channels of Emergency Svc Water & RHR Water Sys Discovered.Sys Declared Inoperable.Caused by Personnel Error.Manholes Inspected (← links)
- 05000352/LER-1989-015, :on 890222,determined That Several Tech Spec Surveillance Requirements for UHS Not Performed within Required Time Period.Caused by Procedural Inadequacy & Personnel Error.Personnel Counseled (← links)
- 05000352/LER-1989-042, :on 890509,determined That 17 of 185 CRD Accumulator Check Valves Could Not Maintain Hydraulic Control Unit Accumulator Pressure Above Low Pressure Alarm Setpoint of 970 Psig.Caused by Personnal Error (← links)
- 05000352/LER-1989-023, :on 890405,determined That in Event of Fire, Lack of Protected Suppression Pool Level & Temp Indication to Support Safe Shutdown of Plant Could Have Adversely Impacted Operator to Assess Conditions (← links)
- 05000352/LER-1989-047, :on 890720,identified That Svc Water Sys Unavailable to Provide Cooling Water to ECCS & RCIC Sys Due to Valve Position.Caused by Inadequate Emergency Procedures. Valve Reopened & Procedure T-103 Revised (← links)
- 05000352/LER-1989-041, :on 890613,four Channels of Primary Containment post-LOCA Radiation Monitor Instrumentation Inoperable. Caused by Procedural Deficiency.Temporary Procedure Change Implemented to Affected Surveillance Tests (← links)
- 05000352/LER-1989-034, :on 890512,certain Excess Flow Check Valve Test Valves Would Not Remain Leak Tight During post-DBA Conditions.Caused by Inadequate Review of Sys Design Specs. All 19 Test Valves Removed (← links)
- 05000352/LER-1989-021, :on 890329,isolation of Refuel Floor Secondary Containment & Initiation of Standby Gas Treatment Sys Occurred.Caused by Improperly Operating Pneumatic Controller for Damper Positioner.Controller Replaced (← links)
- 05000352/LER-1989-039, :on 890601,util Identified Deficiencies in Safe Shutdown Capabilities of Facility in Event of Fire.Caused by Lack of Detailed Procedures Used in Performing Safe Shutdown Analysis.Various Mods Completed Prior to Startup (← links)
- 05000352/LER-1989-046, :on 890719,charcoal Filter Sample Canisters of Standby Gas Treatment Sys Inappropriately Reinstalled.Caused by Chemistry Technician Personnel Error.Sample Canisters Removed & Blank Flanages Installed (← links)
- 05000352/LER-1989-038, :on 890528,RCIC Sys Isolated & RCIC Turbine Received Trip Signal from Steam Leak Detection Sys High Differential Temp Isolation Signal.Caused by Procedural Noncompliance.Technicians Disciplined (← links)
- 05000352/LER-1989-035, :on 890506,control Rods Improperly Verified as Coupled to Drives During Facility Second Fuel Cycle.Caused by Misalignment During Original Installation.Installation Procedures Revised to Prevent Recurrence (← links)
- 05000352/LER-1989-045, :on 890716,radiation Monitor Indication Drifted Above Isolation Setpoint of 1.35 Mr/H Causing ESF Actuation. Caused by Equipment Failure.Radiation Monitor Declared Inoperable & Isolation Reset (← links)
- 05000352/LER-1989-037, :on 890525 & 26,two Nuclear Steam Supply Shutoff Sys Group VI a & B Isolations & Initiations of Standby Gas Treatment Sys Fan & ESF Occurred.Cause Undetermined.Isolation Reset.Relay Replaced (← links)
- 05000352/LER-1989-040, :on 890512,seismic Monitoring Sys Triaxial Response Spectrum Analyzer Printer Failed to Operate During Calibr Functional Test.Caused by Design Deficiency.Upgraded Controller Circuit Board & Printer Installed (← links)
- 05000352/LER-1989-036, :on 890525,pressure Setpoint Testing of 14 Reactor Main Steam Sys Target Rock Corp Pilot Operated two- Stage Safety Relief Valves Revealed That Only One Valve Lifted within Tech Specs Limit (← links)
- 05000352/LER-1988-023, :on 880610,emergency Svc Water (ESW) Pump Start Occurred During Relay Calibr.Caused by Procedure Inadequacies.Esw Pump C Secured 1 Minute After Auto Start. Procedure Revised to Prevent Sys Interaction (← links)
- 05000352/LER-1989-032-01, :on 890513,RWCU Isolation Occurred on Nuclear Steam Supply Shutoff Sys Group III Channels a & D High Differential Flow Isolation Signal.Caused by Sys Equipment Malfunctions.Isolation Reset (← links)
- 05000352/LER-1989-020, :on 890317,hourly Firewatch Insp of Auxiliary Equipment & Remote Shutdown Panel Room Not Conducted within 1 H of Previous Insp.Caused by Inadequate Procedure. Security Procedures Revised (← links)
- 05000352/LER-1989-019, :on 890314,informed That Certain Electrical Equipment Located in High Energy Line Break Compartment May Not Perform Intended Safety Function,Causing Reliance on Unqualified Equipment.Environ Seals Added (← links)
- 05000352/LER-1989-032, :on 890512,full Reactor Protection Sys Scram Signal Generated During Performance of Main Turbine Control Valve Surveillance Testing.Caused by Procedural Inadequacy. Test Procedure Corrected (← links)
- 05000352/LER-1988-031-02, Forwards LER 88-031-02.Safe Shutdown Analysis self- Assessment Program Presented in 890123 Meeting.Assessment Resulted in Determination of Overall Root Cause of Various Reportable Deviations & Schedule for Corrective Actions (← links)
- 05000352/LER-1989-031, :on 890505,scent of Wintergreen,Indicative of Carbon Dioxide,Sensed by Plant Operations Personnel in Main Control Room.Caused by Procedural Inadequacy in That No Guidance Existed for Response to Scent (← links)
- 05000352/LER-1987-041, :on 870806,NSSS Isolations Occurred Due to Channel Reactor B Trip.Caused by Loose Power Supply Cable Connection to Radiation Monitor.Isolations Reset & Loose Connection Tightened (← links)
- 05000352/LER-1987-040, :on 870804,actuation of Group I Nuclear Steam Supply Shutoff Sys Occurred.Caused by Short Circuit from Poor Connection on Relay Logic Board Connector.Isolation Reset & Faulty Connection Removed & Remade (← links)
- 05000352/LER-1987-038, :on 870802,nuclear Steam Supply Shutoff Sys Isolation Occurred.Caused by Short to Ground During Temporary Circuit Alteration Installation Due to Personnel Error.Personnel Counseled (← links)
- 05000352/LER-1987-063, :on 871116,Tech Specs Violation Occurred When Unapproved Blocking Permit Mistakenly Applied.Caused by Personnel Error.Personnel Counseled on Administrative Procedures & Memo to Shift Personnel Issued (← links)
- 05000352/LER-1987-034, :on 870715,four Safety Relief Valves Discovered 3% Over Setpoint Drift.Caused by Corrosion Bonding Between Stellite Pilot Valve,Seat & Labyrinth Seal Clearance Restriction.Valves Replaced & Refurbished (← links)
- 05000352/LER-1987-036, :on 870722,grab Sample from RHR Svc Water Loop B Taken 30 Minutes Late.Caused by Personnel Error. Technician Verified No Change Occurred in Sample Analysis & Sampling Intervals Returned to Every 8 H (← links)
- 05000352/LER-1985-102, :on 851218,drywell Spray Header Outboard Isolation Valve Identified as Not Fully Closed.Caused by Improper Operation of Valve Operator.Valve Disassembled & Inspected During 1987 Refuel outage.W/870901 1tr (← links)
- 05000352/LER-1987-035, :on 870715,unexpected Actuation of Nssss Occurred.Caused by Personnel Error Since Scope of Work Performed & Procedures Followed Not Specific.Preventive Maint Program Revised (← links)
- 05000352/LER-1987-039, :on 870731,technician Failed to Take Grab Sample of Reactor Encl Cooling Water Sys,Per Tech Specs. Caused by Personnel Error.Technicians Instructed on Importance of Sampling on Time (← links)
- 05000352/LER-1987-037, :on 870725,nuclear Steam Supply Shutoff Sys Inboard Isolation Occurred Due to Blown Fuse.Caused by Personnel Error.Fuse Replaced,Isolation Reset & Individual Counseled (← links)
- 05000352/LER-1987-013, :on 870508,reactor Encl Secondary Containment Isolated Due to Low Differential Pressure Between Encl & Outside Environ.Caused by Personnel Error.Sign Posted on Filter Entry Hatch (← links)
- 05000352/LER-1998-017, :on 841026,failure of Fire Protection Hatchway Flow Control Valves to Actuate Was Noted.Caused by Lack of Understanding of Hardware.Modified Hatchway Flow Control Valves & Revised Associated Surveillance Tests (← links)
- 05000352/LER-1987-062, :on 871114,reactor Encl Isolation Occurred. Caused by Personnel Error When Operator Changed Operating Lineup of Reactor Encl Ventilation Fans.Operator Counseled & Operator Aid Posted at Exhaust Control Panel (← links)
- 05000352/LER-1998-016, :on 980728,manual Main CR Ventilation Isolation & CR Emergency Fresh Air Sys Was Initiated Due to Small Freon Leak.Caused by Lack of Preventive Maint.Freon Leak Was Repaired & Chiller Was Tested Satisfactorily (← links)
- 05000352/LER-1987-065, :on 871121,reactor Encl Ventilation Isolation Occurred.Caused by Low Differential Pressure.Isolation Reset & Normal Reactor Encl Ventilation Restored.No Adverse Consequences (← links)
- 05000352/LER-1987-064, :on 871121,reactor Encl Ventilation Isolation & Nssss Isolation Occurred.Caused by Series of Events Re Loss of Auxiliary Steam Boilers.Plant Heating Sys Restored & Isolation Reset (← links)
- 05000352/LER-1987-061, :on 871107,subsystems of Control Room Emergency Fresh Air Supply Sys Inoperable.Caused by Personnel Error. Return Fan a Placed in Svc.Personnel Instructed to Review Requirement for Operability (← links)
- 05000352/LER-1987-023, :on 870611,ESF Actuated Due to Failure of Battery Charger 1A1D103.Caused by Failure of Integrated Circuit Controller Card.Undervoltage Relays Mfg by Brown Boveri Corp Will Be Replaced (← links)
- 05000352/LER-1998-015, :on 950216,discovered That Error in Calibr of CS Internal Line Break Detection Instrumentation Resulted in Setpoints Being Outside Required TS Limit.Recalibr Affected Instrumentation to Account for Change in Baseline Dp (← links)
- 05000352/LER-1987-018, :on 870520,leakage Rates of MSIVs & Total Primary Containment Leakage Exceeded Tech Spec Limit.Caused by Normal Wear.Msivs Repaired & Type B & C Pentrations Repaired (← links)
- 05000352/LER-1987-059, :on 871023,reactor Encl Isolated on Low Differential Pressure During Application of Blocking Permit. Caused by Failed Check Valve on Instrument Air Compressor/ Dryer Train A.Failed Valve Replaced (← links)
- 05000352/LER-1987-049, :on 870919,Tech Spec 3.4.1.4 Surveillance Test ST-6-043-390-1 Re RCS Temp Missed.Caused by Operator Not Performing Applicable Steps.Procedure Revised (← links)
- 05000352/LER-1987-060, :on 871029,two Reactor Encl Isolations Occurred Due to Decreased Pressure Between Encl & Outside Atmosphere. Caused by Lack of Adequate Valve Tagging Sys.Mod 5561 Prepared to Correct Air Sys Deficiencies (← links)
- 05000352/LER-1987-058, :on 871019,reactor Encl Ventilation Isolation & Nssss Isolation Occurred.Caused by Loss of Auxiliary Steam in Inlet Plenum.Auxiliary Steam Restored & Isolations Reset (← links)
- 05000352/LER-1998-014, :on 980128,several Rwcs Isolations Were on High Differential Flow Signals.Caused by Sys Perturbations. Shift Update Notice Was Issued to All Operations Personnel (← links)
- 05000352/LER-1997-013, :on 971205,various PCIVs & Other Valves Were Out of TS Surveillance & 3 Were Otherwise Noted Inoperable. Caused by Construction Drawing Error & Personnel Error. Revised Identified Document Deficiencies (← links)
- 05000352/LER-1997-013-01, Forwards LER 97-013-01,re Failure to Adequately Test Control Logic for Various Pcivs.No New Commitments Made within Ltr (← links)
- 05000352/LER-1987-055, :on 871002,nonconformance W/Fire Safe Shutdown Requirements Identified.Caused by Procedure Deficiency.Flow Switch Relays Removed & Flow Switch Deenergized.App R Review Evaluated (← links)
- 05000352/LER-1987-056, :on 871014,reactor Encl Ventilation Isolation Occurred.Caused by Series of Events Related to Auxiliary Steam Boilers.Outside Assistant Operators Replaced Torch Tip on Auxiliary Boiler B (← links)
- 05000352/LER-1987-025, :on 870611,determined That Control Rod Block Logic Required by Tech Specs Inoperable.Caused by Personnel Error.Control Rod Shuffle Immediately Suspended,Limit Switches Returned to Normal & Contacts Cleaned (← links)
- 05000352/LER-1987-033, :on 870701,control Room Ventilation Sys Isolated.Caused by Spurious Spike of Main Control Room Ventilation Chlorine Detector Due to Defective Solder Connection.Ventilation Sys Restored (← links)
- 05000352/LER-1998-013, :on 841026,failed to Meet Max Travel Distance Limitation & Guidance for Class a Extinguisher Replacement W/Hose Stations.Caused by Failure to Provide Deviation Documentation.Place Extinguishers in Fire Brigade Locker (← links)
- 05000352/LER-1998-012, :on 980530,HPCIS Declared Inoperable.Caused by Locking Tab Piece from Older Style & Piece Broke Off of Currently Installed Locking Tab.Conducted Internal Insp of HPCI Turbine on Each Unit (← links)
- 05000352/LER-1987-054, :on 870927,surveillance Test of Channel E for Control Rod Block for Scram Discharge Vol Not Performed within Required Time.Caused by Personnel Error.Surveillance Performed & Tracking List Prepared (← links)
- 05000352/LER-1987-052, :on 870922,unplanned Isolation of RWCU Sys Occurred Due to Signal from Steam Leak Detection Sys.Caused by Defective Riley Co Differential Temp Switch 86VTFF.Temp Switch Replaced (← links)
- 05000352/LER-1987-032, :on 870612,failed to Locate Neutron Fluence Wire Specimen Dosimeter,Violating Tech Spec Surveillance Requirements 4.4.6.1.4.Caused by Dosimeter Never Being Installed.Lost Part Analysis Prepared (← links)
- 05000352/LER-1987-053, :on 870926,operation of Rod Worth Minimizer Not in Compliance W/Requirements of Tech Spec 4.1.4.a.Caused by Cognitive Personnel Error.Partial Surveillance Test Satisfactorily Performed on 870927 (← links)
- 05000352/LER-1987-051, :on 870922,main Control Room Ventilation Sys Isolated Due to False Channel D High Chlorine Concentration Signal.Caused by Rainwater Depositing on Analyzer Probe. Mod Being Designed (← links)
- 05000352/LER-1987-048, :on 870919,reactor Scrammed Following Main Turbine Trip on electro-hydraulic Control Low Oil Pressure. Caused by Failure of Tubing Socket Weld in Fluid Actuating Supply Line.Failed Weld Replaced W/New Section (← links)
- 05000352/LER-1989-012, :on 890215,identified That Fire in Certain Areas of Plant Could Result in Unavailability of RCIC Sys Due to Insufficient Protection of Control Cables.Evaluation Underway.Procedure GP-2 Will Be Revised (← links)
- 05000352/LER-1987-050, :on 870917,reactor Enclosure Secondary Containment Isolated.Caused by Leak in Instrument Air Line to Reactor Enclosure Exhaust Fan Blade Pitch Control Device. Leak Repaired.Similar Tubing Will Be Inspected (← links)
- 05000352/LER-1989-010, :on 890204,isolation of Refuel Floor (Rf) Secondary Containment & Initiation of Standby Gas Treatment Sys,Esf Occurred on Low Negative Differential Pressure. Caused by Design Deficiency.Sys Reset (← links)
- 05000352/LER-1987-047, :on 870914,isolation of Main Control Room HVAC Occurred.Caused by Elevated Chlorine Levels in Control Encl HVAC Intake Plenum.Electronic Indications Checked & Verified to Be Operating Properly (← links)
- 05000352/LER-1987-046, :on 870907,reactor Protection Sys Initiated Full Reactor Scram.Caused by Instrument Air Supply Root Valves Not Fully Open.Root Valves Opened Fully & Scram Reset (← links)
- 05000352/LER-1987-030, :on 870604 & 05,failure to Perform Monthly Functional Tests of Channels D & B of Refueling Area Ventilation Exhaust Radiation Monitors Discovered.Caused by Personnel Error.Surveillance Tests Performed (← links)
- 05000352/LER-1987-029, :on 870616,various Nuclear Steam Supply Shutoff Sys Isolations Occurred.Caused by Incomplete Review of Implementation Method of Mod to Assess Potential Impact on Facility Operations.Review Underway (← links)
- 05000352/LER-1987-027, :on 870615,reactor Protection Sys (RPS) B & Uninterruptible Power Source Series Breakers Shunt Tripped. Cause Unknown.Rps Power Supply Restored & Nuclear Steam Supply Shutoff Sys Reset (← links)
- 05000352/LER-1987-031, :on 870613,hot Maint Shop Ventilation Operating W/O Exhaust Radiation Monitoring.Caused by Personnel Not Following Procedures for Responding to Alarms. Shop Shut Down & Personnel Counseled (← links)
- 05000352/LER-1987-045, :on 870830,standby Gas Treatment Sys Initiated. Caused by Polyphase Fault to Ground on Unit 2 Load Ctr Transformer,Producing Low Voltage Condition on Unit 1 Instrument Panel.Transformer Returned to Mfg (← links)
- 05000352/LER-1987-015, :on 870514,HPCI Turbine Shut Down After Running for 25 Minutes.Caused by Loose Lead on Output of Flow Controller & Drift in Adjustment Valves Balance Chamber. Loose Lead Tightened & Valves Replaced (← links)
- 05000352/LER-1987-026, :on 870612,nuclear Steam Supply Shutoff Sys Isolation Signal & Reactor Scram Signal Occurred.Caused by Nondestructive Radiographic Exams Being Performed on Main Steam Line A.Isolation & Scram Signals Reset (← links)
- 05000352/LER-1987-024, :on 870611,nuclear Steam Supply Shutdown Sys Isolation of Refuel Floor Ventilation Occurred Due to Low Negative Differential Pressure Between Refuel Floor & Outside Environ.Caused by Personnel Error (← links)
- 05000352/LER-1989-013, :on 890117,Tri-Axial Peak Recording Accelerograph XR-VA-151 Removed from Reactor Vessel Head to Support Vessel Head Removal for Refueling,Resulting in Inoperable Seismic Monitor for Over 30 Days (← links)
- 05000352/LER-1987-022, :on 870609,two Penetrations Containing Testable O-ring Assemblies Not Included in Surveillance Test Procedures.Caused by Procedure Deficiency.Temporary Procedure Change Made (← links)
- 05000352/LER-1987-028, :on 870610,during Security Computer Outage, Firewatch & Security Escort Failed to Perform Hourly Fire Watch Insps.Caused by Failure to Follow Tech Spec 3.7.7 During Outage.Duties Reviewed W/Personnel (← links)
- 05000352/LER-1987-044, :on 870822,discovered That Remote Shutdown Panel Operability Test Did Not Comply W/Tech Spec Surveillance Requirement 4.3.7.4.2.Caused by Procedure Deficiencies & Communication Failure (← links)
- 05000352/LER-1987-042, :on 870818,spurious High Drywell Pressure Signal Combined W/Existing Low Reactor Pressure Resulted in LOCA Signal.Caused by Personnel Error Due to Failure to Follow Approved Procedures.Personnel Counseled (← links)
- 05000352/LER-1987-021, :on 870601,various Channel D Nuclear Steam Supply Shutoff Sys Isolations Occurred.Engineer Caused Short Circuit to Ground,Blowing Fuse Supplying Sys Isolation Circuit Logic.Fuse Replaced.Engineer Counseled (← links)
- 05000352/LER-1997-006-01, Forwards LER 97-006-01 Re Discovery That Fire Protection Sys Deluge Valve May Not Have Functioned Per Design Since Issuance of License.Revised LER Provides Cause & Corrective Actions for Event.Changes Indicated by Rev Bars (← links)
- 05000352/LER-1998-005, :on 980322,load Ctr Feedwater Breaker 124B-62 tripped,de-energizing Components Supported by Load Ctr 124B. Caused by Combination of pre-existing Steam Leak in 1A RWCU Pump Room Circuit Breaker Replaced (← links)
- 05000352/LER-1998-004, :on 980320,missing Fire Dampers in Safe Shutdown Barriers Were Noted.Caused by Inadequate Design Review of Initial Fire barrier.Fire-watches Previously Established for Thermo-lag Issues Were Verified (← links)
- 05000352/LER-1987-019, :on 870525,during Surveillance Test on Reactor Water Level Transmitter,Transmitter Vented Before Being Isolated Causing Pressure Oscillations.Caused by Personnel Error.Low Level Water Signal Reset (← links)
- 05000352/LER-1998-002, :on 980206,primary Containment & Rv Isolation Control Sys Actuation Occurred.Caused by Personnel Error. Fuse Was Replaced & All Isolations Were Reset within 55 Minutes (← links)
- 05000352/LER-1987-020, :on 870522,NSSSS Isolation of RWCU Occurred. Caused by Increased Temp in RWCU Pump Room Above 135 F Setpoint Due to Contractor Personnel Error.Isolation Valve Opened & RWCU Returned to Svc (← links)
- 05000352/LER-1998-006, :on 980405,post Maint Surveillance Test Was Not Performed for A2 RPS Channel Relay Replacement.Caused by Incomplete Document Review.Relay Work Was Reviewed to Evaluate & Resolve Impact of Relay Work on Any Required Sys (← links)
- 05000352/LER-1986-048, :on 861003,nuclear Steam Supply Shutoff Sys Isolation Occurred.Caused by Improper Valve Sequencing by Personnel.Isolation Reset & Personnel Counseled (← links)
- 05000352/LER-1986-047, :on 861001,nuclear Steam Supply Shutoff Sys Isolation Occurred During Surveillance Test.Caused by Personnel Error.Sys Logic Manually Reset & Surveillance Test Successfully Completed (← links)
- 05000352/LER-1986-045-01, :on 860910,NSSS Shutoff Sys Isolated Due to Use of Loose Fitting Test Lead During Performance of Surveillance Test.Caused by Personnel Error.Personnel Counseled.Related Correspondence (← links)
- 05000352/LER-1986-046-01, :on 860923 & 26,main Control Room Ventilation Sys Isolated Due to High Chlorine Concentration Indications. Probably Caused by Rainwater Depositing on Chlorine Analyzer Probes.Related Correspondence (← links)
- 05000352/LER-1987-017, :on 870519,unplanned Nssss Group VI C Isolation Occurred When Momentary High Radiation Signal Received. Cause Unknown.Nssss Isolation Reset & Associated Wiring & Connections Inspected (← links)
- 05000352/LER-1986-044, :on 860909,discovered That Toxic Gas Alarm Setpoint for Vinyl Chloride Greater than Tech Spec Limit. Caused by Mfg Error in Establishing Setpoints for Vinyl Chloride & Ammonia.Related Correspondence (← links)
- 05000352/LER-1986-042, :on 860814,Surveillance Test ST-6-095-450-1 Contained Two Errors,Indicating Availability of Power Throughout Period.Caused by Personnel Error.Test Revised & Administrative Controls Reviewed (← links)
- 05000352/LER-1986-053, :on 861110,unplanned Partial Nuclear Steam Supply Shutoff Sys Group VI C Isolation Occurred Due to False High Drywell Pressure Signal.Caused by Personnel Error.Isolation & Half Scrams Signal Reset (← links)
- 05000352/LER-1987-014, :on 870513,unplanned Nuclear Steam Supply Shutoff Sys Isolation Occurred When Momentary High Radiation Signal Received.Cause Unknown.Nuclear Steam Supply Shutoff Sys Isolation Logic Reset (← links)
- 05000352/LER-1986-052, :on 861110,HPCI Inboard Steam Supply Isolation Valve Closed Due to Nuclear Steam Supply Shutoff Sys Div 4 Isolation Signal.Caused by Technician Error.Isolation Reset (← links)
- 05000352/LER-1987-016, :on 870515,reactor Encl Secondary Containment Isolated.Caused by Const Worker Removing Instrument Cap from Outside Atmosphere Pressure Sensing Line.Instrument Cap Replaced & Isolation Reset (← links)
- 05000352/LER-1986-051, :on 861025,discovered Plug Missing from Spare 1-inch Electrical Conduit Penetration.Cause Unknown.Fire Watch Established Until Plug Replaced (← links)
- 05000352/LER-1986-050-01, :on 861017,HPCI Steam Supply Outboard Isolation Valve HV-55-1F003 Packing Dislodged.Cause Unknown. Surveillance Tests Modified in Order to Reduce Wear Due to Regular Stroking.Related Correspondence (← links)
- 05000352/LER-1986-050, :on 861017,HPCI Steam Supply Outboard Isolation Valve HV-55-1F003 Packing Dislodged.Cause Unknown. Surveillance Tests Modified in Order to Reduce Wear of Regular Stroking (← links)
- 05000352/LER-1987-012, :on 870418,reactor Encl Secondary Containment Isolated Due to Low Differential Pressure Between Reactor Encl & Outside.Caused by Loss of Instrument Air Supply to Pressure Converter.Air Supply Restored (← links)
- 05000352/LER-1986-005, :on 860112,main Control Room Ventilation Sys Isolated & Train B of Emergency Fresh Air Sys Started. Caused by Breakage of Chlorine Analyzer D Tape.Tape Reattached.New Detection Sys Implemented (← links)
- 05000352/LER-1986-007, :on 860124,main Control Room Ventilation Sys Isolated & Train B of Emergency Fresh Air Sys Started.Caused by Breakage of Chlorine Analyzer D Tape.Tape Reattached.New Detection Sys Implemented (← links)
- 05000352/LER-1987-011, :on 870416,operation Personnel Discovered That Reactor Encl Recirculation Sys a Inoperable Since 870403. Cause Unknown.Operator Placed Circuit Breaker Charging Motor Disconnect Switch in on Position (← links)
- 05000352/LER-1986-049, :on 861009,unplanned Isolation of Valve in RWCU Sys Occurred During Surveillance Test.Caused by Mild Contact Between Hand of Technician & Adjacent Relay.Isolation Reset & RWCU Sys Restarted.Related Correspondence (← links)
- 05000352/LER-1986-056, :on 861222,review of Surveillance Test Revealed Logic Channel Inoperability Exceeded Tech Spec Section 3.3.6.Caused by Procedural Deficiency.Surveillance Test Revised to Incorporate Requirements (← links)
- 05000352/LER-1986-036, :on 860708,hourly Firewatch for Five Fire Barriers Not Performed within 1 H Time Interval Required by Tech Spec 3.7.7.Caused by Lack of Communication W/Security Force Personnel.Security Procedures Revised (← links)
- 05000352/LER-1987-005, :on 870130,two Temporary Cables,Used to Collect Data During Startup,Incorrectly Routed & Not Connected to Proper Channelized Multiplexers.Caused by Improper Evaluation During Cable Installation (← links)
- 05000352/LER-1986-038, :on 860717,discovered Two Containment Isolation Valves Inoperable.Caused by Shift Supervisor Authorizing Taking Valves Out of Svc for Preventive Maint. Valves Tested & Returned to Operable Status (← links)
- 05000352/LER-1986-037, :on 860709,main Control Room Ventilation Sys Isolated & Control Room Emergency Fresh Air Sys Started. Caused by Presence of Low Levels of Chlorine in Control Encl HVAC Intake Air.Ventilation Isolation Reset (← links)
- 05000352/LER-1986-035, :on 860707,channel Functional Surveillance Tests for intermediate-range Monitors Overdue.Caused by Procedural Inadequacies.General Procedures GP-3 & GP-4 Revised (← links)
- 05000352/LER-1987-003, :on 870122,control Room Ventilation Sys Isolated & a Train of Control Room Emergency Fresh Air Supply (CREFAS) Sys Initiated.Caused by Design Deficiency. Control Room Ventilation Isolation Reset (← links)
- 05000352/LER-1987-002, :on 870121,NSSS Sys Isolation Occurred During Performance of Surveillance Test.Caused by Personnel Error. Technicians Counseled as to Importance of Performing Procedures in Correct Sequence (← links)
- 05000352/LER-1987-004, :on 870124,NSSS Sys Group VI C Isolation Occurred During Performance of Surveillance Test.Caused by Technician Error.Personnel Counseled (← links)
- 05000352/LER-1986-031, :on 860617,containment Leakage Test Program Determined That Total Combined Leakage of Types B & C Tests Exceeded Allowable Leak Rate Limit.Caused by Normal Wear.New Valve Seats Installed (← links)
- 05000352/LER-1997-008-01, :on 841026,fire Protection Group Personnel Discovered That Annual Inspection of Fire Extinguishers Had Not Been Performed.Caused by Personnel Error.Will Establish Annual Portable Fire Extinguisher Insps (← links)
- 05000352/LER-1997-007-01, :on 970910,isolation of Rwcs Resulting from Lifting of Filter Demineralizer Psv Occurred.Caused by Setpoint Drift.Procedures Revised (← links)
- 05000352/LER-1997-007, Forwards LER 97-007-00 Reporting Unit 1 Primary Containment & Reactor Vessel Isolation Control Sys Actuation Resulting in RWCU Sys Isolation.Rwcu Sys Isolation Was Caused by Lifting of B RWCU Filter Demineralizer Influent Psv (← links)
- 05000352/LER-1999-009, :on 990802,maint Was Performed That Required Disabling Certain Monitoring Capabilities on Safeguard Sys. Caused by Failure to Properly Use Plant Procedure.Monitoring Capability Was Restored to Svc & Tested (← links)
- 05000352/LER-1986-045, :on 860910,nuclear Steam Supply Shutoff Sys Isolated on Blown Fuse Due to Use of Loose Fitting Test Lead During Surveillance Testing.Caused by Personnel Error.Fuse Replaced,Isolations Reset & Personnel Advised (← links)
- 05000352/LER-1986-042-01, :on 860814,Surveillance Test ST-6-095-450-1 Re Div I-IV Safeguard Power Distribution Alignment & Voltage Check Not Performed.Discovered on 860901.Caused by Procedure Errors.Test Revised.Related Correspondence (← links)
- 05000352/LER-1986-022, :on 860506,spurious ESF Actuation Occurred in Control Room Emergency Fresh Air Sys.Caused by servo- Mechanism Problem in Foxboro Miran 981 Gas Detector.Main Control Room Isolation Reset (← links)
- 05000352/LER-1986-043, :on 860826,Foxboro Miran 981 B Toxic Gas Detector for Main Control Room Ventilation Sys Found Operating Nonconservatively on Vinyl Chloride Channel.Caused by Design Deficiency (← links)
- 05000352/LER-1986-014, :on 860227,reactor Encl Isolation Occurred W/ Actuation of Recirculation Sys & Standby Gas Treatment Sys. Caused by Break in Equipment Access Airlock.Sys Reset & HVAC Returned to Normal (← links)
- 05000352/LER-1986-013, :on 860223 & 0312,unplanned Isolation of RWCU Sys Occurred When Inboard Isolation Valve HV-44-1F001 Received Close Signal from Div 1 Steam Leak Detection Sys. Caused by Defective Riley Module (← links)
- 05000352/LER-1999-008, :on 990623,plant HPCI Failed to Start.Caused by Corrosion Products Which Caused Binding in Hydraulic Actuator.Hydraulic Actuator Was Replaced,Surveillance Test Was Performed & HPCI Was Declared Operable on 990625 (← links)
- 05000352/LER-1987-001, :on 870105,reactor Encl Secondary Containment Isolation Occurred as Result of Low Differential Pressure. Caused by Events Resulting from Trip of Auxiliary Steam Boiler.Boiler Restarted & Heating Sys Restored (← links)
- 05000352/LER-1986-057, :on 861230,discovered That Surveillance Test (ST) for Leak Tightness of Primary Containment Air Lock Over Due.Caused by Cognitive Personnel Error.St Performed & Scheduling Data Entered Into ST Computer (← links)
- 05000352/LER-1985-075, :on 850923,review of Aug Monthly Surveillance Test Indicated That Fire Door 599 Not Tested to Verify Operability of Alarm Function on 850825.Caused by Omission of Door from Testing.Door Successfully Tested (← links)
- 05000352/LER-1999-007, :on 990617,inadvertent Emergency Svc Water Start During Test Equipment Installation Occurred.Caused by Personnel Error.Procedure Revised.With (← links)
- 05000352/LER-1999-006, :on 990614,determined That Grab Sample of Plant Offgas Sys Was Not Obtained within Time Limit Required by TS 3.3.7.12,Action 110.Caused by Personnel Error.Analyzer Was Restored to Operable Status & Individual Was Counseled (← links)
- 05000352/LER-1999-005, :on 990611,RPS & ESF Actuations Were Noted. Caused by Personnel Error During Turbine Routine Testing. Revised Backup Overspeed & Power/Load Unbalance Test Routine Test Procedure.With (← links)
- 05000352/LER-1987-010, :on 870326,surveillance Test Did Not Meet Tech Spec Requirements.Caused by Inadequate Local Leak Rate Surveillance Test Procedure.Shift Supervision Notified & Temporary Procedure Change Implemented (← links)
- 05000352/LER-1986-041, :on 860806,Surveillance Test ST-6-093-450-1 Failed to Comply W/Tech Spec Requirements.Caused by Deficient Test Procedure.Procedure Revised (← links)
- 05000352/LER-1999-004-01, :on 990606,ADS Was Inoperable During Planned Maint & Applicable TS Was Not Met.Caused by Inadequate Review Operability Requirements.Clearance Was Removed from Backup ADS Gas Bottles & Sys Was Returned to Service (← links)
- 05000352/LER-1986-032, :on 860621,Surveillance Test ST-6-043-320-1, Daily Jet Pump & APRM Flow Unit Operability Verification, Not Performed Per Tech Specs.Caused by Operator Oversight. Operator Counseled & Procedure Revised (← links)
- 05000352/LER-1988-026, :on 880717,control Room HVAC Isolation Resulted from High Chlorine Concentration Signal Caused by Rain Water Contacting Analyzer Probe.Proper Control Room Isolation Verified & Control Room Ventilation Restored (← links)
- 05000352/LER-1988-025, :on 880627,reactor Encl Isolation Occurred While Performing Surveillance Test.Caused by Instrument Isolation Valve Being Partially Closed During Surveillance. Reactor Encl Isolation Reset Per Procedure (← links)
- 05000352/LER-1986-029, :on 860609,ESF Actuation Occurred Causing Reactor Protection & Uninterruptible Power Sys Static Inverter to Deenergize.Caused by Incomplete Connection Between Logic Card & Mating Connector (← links)
- 05000352/LER-1986-028, :on 860603,ESF Actuated Control Room Emergency Fresh Air Sys.Caused by Ventilation Sys Toxic Gas Analyzer Misinterpreting Freon Refrigerant as Toxic Gas.Ventilation Manually Isolated (← links)
- 05000352/LER-1987-009, :on 870306,control Room Ventilation Sys Isolated & Emergency Fresh Air Supply Sys Train B Actuated. Caused by False Signal from Channel D Chlorine Analyzer. Temporary Circuit Alteration Installed (← links)
- 05000352/LER-1986-054, :on 861218,reactor Encl Secondary Containment Isolation Occurred When Fuse Blew in Isolation Logic.Cause Unknown.Fuse Replaced W/Fuse of Correct Size & Isolation Reset (← links)
- 05000352/LER-1986-023, :on 860512,ESF Actuated During Performance of Surveillance Test ST-2-42-462-1.Caused by Personnel Error. Surveillance Test Revised to Provide Proper Connection of Test Equipment (← links)
- 05000352/LER-1986-026, :on 860516,reactor Encl HVAC Isolated During Surveillance Test ST-2-26-621-1.Caused by Blown Fuse in High Radiation Isolation Circuit of Reactor Encl Ventilation Sys. Fuse Replaced & Reactor Encl Isolation reset.W/860613 1tr (← links)
- 05000352/LER-1986-021, :on 860503,inadvertent Initiation of ESF Occurred During Surveillance Testing.Caused by Improper Use of Jumpers.Jumper Removed & Fuse Replaced (← links)
- 05000352/LER-1987-008, :on 870302,control Room Ventilation Sys Isolated Due to Chlorine Analyzer Failure.Cause of Probe Malfunction Investigated & Not Determined.Analyzer Probe Replaced (← links)
- 05000352/LER-1988-030, :on 881003,determined That Unit Operating in Unanalyzed Condition from Receipt of OL Until 880419.Caused by Personnel Error Due to Design Change Not Implemented During Const.Fire Damper Doors Inspected (← links)
- 05000352/LER-1986-017, :on 851121,absence of Gutter Internal Fire Protection Seal Noted.On 860303,addl Seals in Four Electrical Gutters Missing.Caused by Personnel Failing to Notify of Abnormal Condition.Memo Issued (← links)
- 05000352/LER-1999-002-01, :on 990303,failure to Perform TS Surveillance Required Locked Valve Insp Occurred.Caused by Personnel Error.Procedures Revised.With (← links)
- 05000352/LER-1987-007, :on 870223,discovered Eight Surveillance Test Procedures for Intermediate Range Monitor (IRM) Channel Functional Test Did Not Include Check of IRM Inoperative Function.Caused by Procedural Deficiency (← links)
- 05000352/LER-1987-006, :on 870218 & 19,control Room Ventilation Sys Isolated & Control Room Emergency Fresh Air Supply Sys Train B Initiated.Caused by Chlorine Analyzer D Falsely Indicating Chlorine Present.Ventilation Isolation Reset (← links)
- 05000352/LER-1985-067, :on 850813,reactor Encl Ventilation Sys Isolation Occurred.Caused by Low Encl Differential Pressure. Isolation Reset.Interim Measure Info Tags Placed at Fan Control Panel Re Exhaust Fan Combination (← links)
- 05000352/LER-1985-068, :on 850816,reactor Water Cleanup Sys Valve HV-1F001 Isolation Occurred.Caused by Excessive Heat Input Into HX Room Due to Dumping Sys Flow to Main Condenser for 1 H.Isolation Reset (← links)
- 05000352/LER-1985-070, :on 850814,fire Seal Between Static Inverter Room & Cable Spreading Room Determined Ineffective.Caused by Improper Sealant Filling Technique & Inadequate Insp Procedures.Fire Watch Posted & Seal Repaired (← links)
- 05000352/LER-1985-069, :on 850817,safeguard Power Distribution Alignment & Voltage Check Surveillance Test Not Performed within Specified Time.Caused by Shift Supervision Error. Surveillance Test Performed (← links)
- 05000352/LER-1984-015, :on 841126,prior to Initial Criticality, Outboard RHR Shutdown Cooling Valves Received Isolation Signal Due to Surveillance Testing.Caused by Procedural Deficiency.Shutdown Cooling Mode Restored (← links)
- 05000352/LER-1985-031, :on 850314,failure of Control Room Chlorine Detector D Caused Normal Ventilation Sys to Isolate & Train B of Control Room Emergency Fresh Air Sys to Start.Caused by Broken Sample Tape in Detector.Tape Repaired (← links)
- 05000352/LER-1985-030, :on 850303,failure of Control Room Chlorine Detector D Caused Normal Ventilation Sys to Isolate & Train B of Control Room Emergency Fresh Air Sys to Start.Caused by Broken Sample Tape in Detector.Tape Repaired (← links)
- 05000352/LER-1985-029, :on 850301,failure of Control Room Chlorine Detector D Caused Normal Ventilation Sys to Isolate & Train B of Control Room Emergency Fresh Air Sys to Start.Caused by Broken Sample Tape in Detector.Tape Repaired (← links)
- 05000352/LER-1985-034, :on 850322,since 841017,standby Liquid Control Tank Found to Contain Less than 5,500 Lb Available Sodium Pentaborate Per Tech Spec Requirement.Caused by Procedural Deficiency.Test Revised (← links)
- 05000352/LER-1999-001-02, :on 990217,old Rev of LGS PSP Was Discovered on Hard Drive of self-contained Computer in Security Ofc Area. Caused by Less than Adequate Ac.Security Force Was Placed on Heightened Awareness to Compensate for Compromise of SG (← links)
- 05000352/LER-1986-019, :on 860405,fire Watch Insp Interval for Ineffective Penetration Seal PSA-110-Z043 Exceeded 1 H Limit.Caused by Personnel Error.Area Inspected During Second Round & Personnel Counseled (← links)
- 05000352/LER-1986-016, :on 860325,Tech Spec Time Limit for Surveillance Test Violated When Trip Channel Inoperable for More than 2 H.Caused by Inadequate Communication.Improved Communication Discussed (← links)
- 05000352/LER-1986-040, :on 860723,RWCU Sys Isolated Twice as Result of Regenerative HX Room Temp Exceeding 122 F Setpoint.Caused by Ventilation Sys Being Removed from Svc & Failure of Pressure Safety Relief Valve (← links)
- 05000352/LER-1986-034, :on 860707,during Maint Outage,Health Physics Technician Left Fire Door Blocked Open W/O Fire Watch Established.Caused by Personnel Error.Door Closed & Locked & Technician Counseled (← links)
- 05000352/LER-1998-001, :on 980124,Unit 1 HPCI Sys Initiation Occurred. Caused by Less than Adequate Understanding for Potential Loss of Grounding Signal Upon Troubleshooting Control Form. Event Will Be Reviewed by All Work Group Personnel (← links)
- 05000352/LER-1986-030, :on 860611,during Mode 4,unexpected Actuation of Nuclear Steam Supply Shutoff Sys Occurred.Caused by Personnel Error.Group 1 Isolation Reset Per Procedure GP-8. Info Tag Placed on Control Panel (← links)
- 05000352/LER-1997-009-01, :on 971015,RM Was Incorrectly Configured.Caused by Personnel Error.Piping at RM Sample Skid Has Been Corrected & Affected Drawings Have Been Revised to Reflect Change (← links)
- 05000352/LER-1986-027, :on 860523,during Mode 4,Tech Spec Fire Watch Violation Discovered.Caused by Personnel Error When Drain Hose Routed Through Propped Open Fire Door W/O Fire Watch. Personnel Counseled (← links)
- 05000352/LER-1986-015, :on 860304,main Control Room Ventilation Sys Isolated & Train B of Control Room Emergency Fresh Air Sys Started.Caused by Breakage of Chlorine Analyzer Tape D. Chlorine Detection Sys Temporarily Installed (← links)
- 05000352/LER-1986-025, :on 860513,actuation of Nuclear Steam Supply Shutoff Sys Logic Occurred.Caused by Failure of Technician to Verify Step During Performance of Surveillance Procedure. Isolation Reset & Valve Reopened (← links)
- 05000352/LER-1997-014, :on 971222,RHRSW Sys Pump Tripped Due to Spurious Trip Signal Generated by B Radiation Monitor. Replaced Preamplifier Cable for B Radiation Monitor, Cleaned Signal Connectors & Generated CM Action Request (← links)
- 05000352/LER-1986-020, :on 860502,reactor Water Level Decreased to Low Level Scram Setpoint,Causing Scram.Caused by Personnel Error.Low Level Scram Reset & Reactor Water Level Restored. Addl Personnel Training Developed (← links)
- 05000352/LER-1998-019, :on 981202,noted Unescorted Access to Contract Employee Who Had Tampered with Drug Test Specimen.Caused by Incorrect Computer Data Entry for pre-access Drug Screening. Will Develop Formal Training Program for Data Entry Clerk (← links)
- 05000352/LER-1985-078, :on 850831,Tech Spec Surveillance Test for Control Rod Operability Not Performed.Caused by Personnel Error.Surveillance Test Performed on 851001.Test Now Listed on Weekly Schedule (← links)
- 05000352/LER-1997-012, :on 971120,unplanned Closure of Primary Containment Isolation Valve Occurred.Caused by an Inaccurate Drawing & an Inadequate Partial Surveillance Test. Engineering Change Request Was Initiated (← links)
- 05000352/LER-1986-046, :Between 860923-26,main Control Room Ventilation Sys Isolated Three Times.Caused by False High Chlorine Indications Due to Rainwater on Chlorine Analyzer Probes.Probe Relocation Being Evaluated (← links)
- 05000352/LER-1988-021, :on 880601,control Room HVAC Isolation Resulting from High Chlorine Concentration Signal Occurred. Caused by Rainwater Contacting Chlorine Analyzer Probe D During Storm.Mod to Instrumentation Planned (← links)
- 05000352/LER-1988-034, :on 881106,isolation of Reactor Encl Secondary Containment Occurred on Low Differential Pressure.Caused by Severed Instrument Air Line Servicing Reactor Encl Exhaust Fan Blade Pitch Positioner B (← links)
- 05000352/LER-1988-001, :on 880106,discovered That RCIC Sys pipe-routing Area Temp Reading Deviating from Previous Shift Readings.Caused by Incorrect Reconnection of Thermocouple & Personnel Error.Technicians Counseled on Error (← links)
- 05000352/LER-1988-033, :on 881101,discovered Unacceptable Electrical Isolation Between Facility Class 1E Div II Dc Power Source & D22 Bus Dc Circuits.Caused by Personnel Error.All non-Class 1E Circuits Removed from Div II Dc Source (← links)
- 05000352/LER-1988-012, :on 880409,actuation of Reactor Protection Sys & ESF Occurred.Caused by Reactor Operator Error.Operator Cautioned to Be Constantly Aware of Condition Which Affect Core Reactivity (← links)
- 05000352/LER-1988-020, :on 880521,reactor Encl Secondary Containment Isolation Occurred.Caused by Vibration Induced to Tubing or Tubing Defect.Air Line Tubing Repaired & Reactor Encl Isolation Reset (← links)
- 05000352/LER-1999-003-01, :on 990420,RPS & PCRVICS Actuations Were Noted, Due to Loss of FW Transient.Caused by Spuriously Opening Breaker.Deep Bed Condensate Deminerlizer Sys Was Replaced (← links)
- 05000352/LER-1988-018, :on 880511,main Control Room Ventilation Sys Isolated Due to Channel C High Chlorine Concentration Signal.Caused by Contact of Rainwater W/Analyzer Probe. Special Event Procedure SE-2 Implemented (← links)
- 05000352/LER-1988-016, :on 880507,Channel B Reactor Protection Sys 1/2 Scram & Various Nuclear Steam Supply Shutoff Sys Isolations Occurred.Caused by Overheating of Fuse Due to Inadequate Contact.Fuse Replaced (← links)
- 05000352/LER-1988-017, :on 880509,reactor Encl Isolation & Nssss Group VI a & B Isolations Occurred.Caused by Component Failure. Instrument Air Supply to SV-76-144A Closed Following Second Reactor Encl Isolation (← links)
- 05000352/LER-1988-029, :on 880830,individual Responsible for Maintaining Continuous Firewatch Post Discovered Inattentive.Caused by Cognitive Personnel Error.Firewatch Person Terminated (← links)
- 05000352/LER-1986-012, :on 860213,during Review of Rev to Surveillance Test,Four Radiation Monitors on RHR Svc Water Sys Determined Not in Compliance W/Tech Spec.Caused by Administrative Oversight.Proper Circuitry Installed (← links)
- 05000352/LER-1998-018, :on 980911,potential Loss of EDG Control in Event of Fire,Was Determined.Caused by fire-induced Damage to Unprotected Voltage & Speed Control Cables.Ncr 98-02422 Was Generated to Disposition Identified Deficiencies (← links)
- 05000352/LER-1986-010, :on 860130,operation of Facility in Excess of Licensed Reactor Power Level Discovered.Caused by Improper Calibr of Permanent Feedwater Flow Transmitters.Feedwater Flow Transmitters Recalibr (← links)
- 05000352/LER-1986-006-01, :on 860122,failure to Perform Tech Spec Surveillance Requirements Discovered.Caused by Inadequate Communication of Surveillance Test Due Dates.Administrative Guideline Implemented (← links)
- 05000352/LER-1988-015, :on 880418,emergency Diesel Generator auto-started Due to Unplanned Test Start Signal.Caused by Personnel Error.Training Memo Issued to All Field Engineers Requiring Completion of Stated Form (← links)
- 05000352/LER-1987-068, :on 871230,Tech Spec 3.3.7.12 Violated.Caused by Radiation Monitor Sampling Sys for Hot Maint Found Out of Svc Due to Inadequate Training & Equipment Failure.Pressure Switch Replaced & Tested Satisfactorily (← links)
- 05000352/LER-1988-028, :on 880817,main Control Room Ventilation Sys Isolated on Channel D High Chlorine Room Emergency Fresh Air Supply Sys.Caused by Rainwater Coming in Contact W/Chlorine Analyzer Probe During Thunderstorms (← links)
- 05000352/LER-1998-015-01, Forwards LER 98-015-01,re Condition Prohibited by TS Due to Calibration Error.Rev Makes Editorial Corrections to Description of Event (← links)
- 05000352/LER-1988-014, :on 880416,control Room HVAC Isolated Due to False Channel D High Chlorine Concentration Signal.Probably Caused by Rainwater Contact W/Chlorine Analyzer Probe.Mod to Emergency Fresh Air Supply Sys to Be Installed (← links)
- 05000352/LER-1986-006, :on 860119,discovered That Monthly Surveillance Tests 7-022-951-0 & 7-022-953-0 Not Performed Prior to 860129 as Required by Tech Specs.Caused by Inadequate Communications.Tests Performed (← links)
- 05000352/LER-1988-013, :on 880409,full Scram Signal Received When Intermediate Range Monitor Detector Failed.No Control Rod Motion as Result of Event Due to Control Rods Insertion When Entering Shutdown Mode.Monitor to Be Replaced (← links)
- 05000352/LER-1988-024, :on 880623,failure to Stroke Test Valve Following Maint Resulted in Failure to Take Tech Spec Action Statement.Caused by Personnel Error.Individuals Counseled About Importance of post-work Testing (← links)
- 05000352/LER-1986-002, :on 860105,during Mode 4,unplanned Actuation of Reactor Encl Recirculation Sys & Initiation of Standby Gas Treatment Sys Occurred.Caused by Personnel Error.Personnel Counseled.Info Tags Placed Near Reset Switches (← links)
- 05000352/LER-1986-004, :on 860109,during Mode 2,reactor Encl Isolation & Reactor Encl Recirculation Sys & Standby Gas Treatment Sys Actuations Occurred.Caused by Exhaust Fan Blade Oscillation. Fan Blade Pitch Adjusted (← links)
- 05000352/LER-1988-027, :on 880721,control Room Ventilation Sys Isolated on Channel D High Chlorine Concentration Signal During Heavy Rain Storm.Caused by Rainwater in Contact W/ Chlorine Analyzer Probe.Mod Implemented (← links)
- 05000352/LER-1985-101, :on 851230,Tech Spec 3.3.7.8.2 Requiring Two Operable Toxic Gas Detection Subsystems Found Unmet.Caused by Operator Error.Procedures S57.8A & S78.1F Revised (← links)
- 05000352/LER-1988-011, :on 880326,RWCU Isolation Occurred Due to High Differential Flow.Caused by Pressure Transient While Removing Filter Demineralizer from Svc.Filter Demineralizer Bypass Valve to Be Replaced During Outage (← links)
- 05000352/LER-1988-010, :on 880326,initiation of ESF Occurred Due to Reactor Encl Isolation.Caused by Nonlicensed Operator Failure to Follow Procedures.Reactor Encl Isolation Reset & Normal Ventilation Put in Svc (← links)
- 05000352/LER-1988-008, :on 880323,Tech Spec 3.7.7 Violated.Caused by Fire Watch Measures Not in Place for Discovered Electrical Conduit Found Lacking Fire Rated Internal Conduit Seals.Fire Watch Patrol Established & Seals Installed (← links)
- 05000352/LER-1985-091, :on 851120,during Startup,Valve Operator for Outboard Isolation Valve of Standby Liquid Control Sys Deenergized in Open Position to Allow Preventive Maint on Valve Operator.Caused by Personnel Error (← links)
- 05000352/LER-1985-088, :on 851112,spurious half-scram Signal on Reactor Protection Sys Channel B Occurred Along W/Isolation of Various Nuclear Steam Supply Shutoff Subsystems of Undervoltage Relay (← links)
- 05000352/LER-1988-007, :on 880309,HPCI Sys Declared Inoperable.Caused by Pressure Transmitter Failure.Transmitter Replaced & Tested & Cause for False Signal Due to Failed Amplifier Board (← links)
- 05000352/LER-1988-022, :on 880609,inadvertent Start of Emergency Diesel Generator During Installation of Test Equipment Occurred.Caused by Procedural Deficiency.Special Procedure SP-ST-012 Revised (← links)
- 05000352/LER-1985-055, :on 850529,isolation of RWCU Sys Occurred. Caused by Deficient Differential Temp Switch.Rwcu Sys Logic Reset,Panel 10C609 Inspected & TDTS-44-1N602AA Tested Four Times.No Defects Found (← links)
- 05000352/LER-1985-035, :on 850323,isolation of Reactor Water Cleanup Sys Occurred.Caused by Trip Signal Generated by Momentary Voltage Spike.Resistor Added to Suppress Momentary Voltage Transient (← links)
- 05000352/LER-1985-027, :on 850225,spurious Isolation of RWCU Sys Occurred.Caused by Trip Signal Generated by Momentary Voltage Spike.Rwcu Isolation Reset & Returned to Svc (← links)
- 05000352/LER-1988-008-01, :on 880323,discovered That Electrical Conduit Penetrating fire-rated Door Lacked fire-rated Internal Conduit Seals.Cause Undetermined.Missing Seals Installed When Cable Pulling Work Complete (← links)
- 05000352/LER-1994-011, :on 940822,reactor Enclosure Heating Ventilation & Air Conditioning Exhaust Monitor Inadvertently Tripped.Caused by Malfunction of Power within Monitor.Power Supply Was Replaced & Reset Isolation Signal (← links)
- 05000352/LER-1988-006, :on 880229,fire Protection Sys Required by Tech Specs Declared Administratively Inoperable.Caused by Design Deficiency.Firewatch Posted & Addl Fire Hoses Made Available in Area of Inoperable Water Curtains (← links)
- 05000352/LER-1997-005, :on 970311,two Separate RWCU Isolations Caused by Lifting Filter Demineralizer Pressure Safety Valve.Will Monitor RWCU Filter Demineralizer Psvs to Determine If Potential Need Exists to Replace Psvs (← links)
- 05000352/LER-1997-005-01, Forwards LER 97-005-01 Which Documents Two Separate Unit 1 Primary Containment & Reactor Vessel Isolation Control Sys Actuations.Changes to Corrective Actions Indicated by Rev Bar in Left Hand Margin (← links)
- 05000352/LER-1988-005, :on 880219,determined One of Four Reactpr Coolant Leakage Monitoring Sys Inoperable in Violation of Tech Spec 3.4.3.1.Investigation Continuing.Wiring Restored to as-built Condition & Sys Declared Operable (← links)
- 05000352/LER-1988-002, :on 880130,isolation of Reactor Encl Secondary Containment Occurred.Caused by Exhaust Fan a & B Blade Pitch Settings Requiring Adjustment.Instrument Air Tubing to Exhaust Fan B Damper Replaced (← links)
- 05000352/LER-1985-074, :on 850919,NSSSS Actuation & Standby Gas Treatment Sys Initiation Occurred.Caused by Personnel Error & Blown Fuse.Isolations Confirmed & Fuse Replaced (← links)
- 05000352/LER-1988-003, :on 880201,monthly Surveillance Test Discovered to Be Overdue & Violating Tech Specs Due to Scheduling Error.Caused by Incorrect Master List W/Invalid Scheduled Date.No Corrective Action Required (← links)
- 05000352/LER-1985-097, :on 851213,main Control Room Ventilation Sys Isolation & Train B of Control Room Emergency Fresh Air Sys Actuated.Caused by Breakage of Tape in Chlorine Analyzer D Due to Design Deficiency.Tape Repaired (← links)
- 05000352/LER-1997-003, :on 970204,degraded Back Pressure Dampers Needed for Pipe Rupture Mitigation Resulted in Operation Being Outside Design Basis.Caused by Failure to Include Periodic Cycling & Cleaning of Bdps.Addl Failures,Corrected (← links)
- 05000352/LER-1985-056, :on 850529,primary Containment Instrument Gas Sys Isolation Valves Isolated to Closed Position.Caused by Loose Connections in Panel.Connections Tightened to Prevent Further Inadvertent Isolations (← links)
- 05000352/LER-1984-027, :on 841207,svc Water Sys Effluent Line Gross Radioactivity Sample Not Obtained within 8 H Period.Caused by Personnel Error.Supervisor Counseled (← links)
- 05000352/LER-1985-099, :on 851223,unplanned Actuation of Nuclear Steam Supply Shutoff Sys Occurred W/Unit in Operational Mode 1 at 72% Power.Caused by Signal Loss,Possibly Due to Disturbance to Rack Connectors (← links)
- 05000352/LER-1985-098, :on 851219,w/unit in Startup Mode at 0% Power, RWCU Sys Isolation Occurred.Caused by Incorrect Procedure Rev During Installation of Plant Mod.Sys Restored to Svc & Procedure Rev Corrected (← links)
- 05000352/LER-1986-011, :on 860210,full Reactor Scram on High Neutron Flux Occurred Due to Unexpected Closure of Turbine Control Valves.Caused by Ground in Electrohydraulic Control Circuit. True Cause of Ground Unknown (← links)
- 05000352/LER-1985-081, :on 851013,during Shutdown,Main Control Room Chlorine Isolation & Emergency Fresh Air Sys Initiated. Caused by Broken Sample Tape in Chlorine Analyzer D (AE-78-016D).Tape Repaired (← links)
- 05000352/LER-1985-079, :on 851008,standby Liquid Control Sys Received Unexpected Actuation Signal & RWCU Sys Received Automatic Isolation Signal.Caused by Design Deficiency.Rwcu Sys Placed in Svc & Reset (← links)
- 05000352/LER-1985-076, :on 850924,automatic Isolation of Control Room HVAC Sys & Initiation of Control Room Emergency Fresh Air Sys Occurred.Caused by Loss of Power Circuitry on Main Control Room C Chlorine Detector (← links)
- 05000352/LER-1997-002, :on 970123,failed to Perform Required Visual Inspections of Blind Flanges.Caused by Misinterpretation of Surveillance Requirements.Visually Inspected Blind Flanges & Incorporated These Into Surveillance Tests (← links)
- 05000352/LER-1997-001-01, :on 841026,failed to Test safety-related Logic Circuits.Caused by Inadequate Test Procedures.Tested & Restored Untested Contacts to Operable Status & Will Revise Appropriate Surveillance Test Procedures (← links)
- 05000352/LER-1985-090, :on 851117,while in Shutdown Mode,High Toxic Chemical Concentration Alarm Annunciated.Cause Unknown.High Reading Returned to Normal After Isolation of Main Control Room Ventilation Sys (← links)
- 05000352/LER-1985-089, :on 851115,isolation of Reactor Encl Ventilation Sys Occurred.Caused by Inability of Exhaust Fans to Extract Enough Higher Density Air to Maintain Negative Pressure.Auxiliary Steam Restored & Sys Reset (← links)
- 05000352/LER-1985-077, :on 850926,spurious Div IV Trip Signals Received Resulting in Load Shedding in Anticipation of Diesel Generator Loading.Caused by Loose Connection in Power Panel.Connection Tightened (← links)
- 05000352/LER-1985-087, :on 851105,during Review of Suppl Evaluation of Fire Protection Safe Shutdown Capability,Determined That Three Cables Inadequately Protected from Fire.Caused by Personnel Error (← links)
- 05000352/LER-1986-009, :on 860126,overdue Calibr of Two Instruments on Remote Shutdown Panel Discovered.Caused by Error Made While Reporting Surveillance During 1984.Instruments Successfully Calibr & Surveillance Completed (← links)
- 05000352/LER-1985-086, :on 851030,main Control Room Chlorine Isolation & Emergency Fresh Air Sys Actuation Occurred.Caused by Defective Chlorine Analyzer Tape.Tape Replaced.New Chlorine Detection Sys Will Be Procured (← links)
- 05000352/LER-1996-021, :on 841026,determined Fire Safe Shutdown Made in Fire Safe Shutdown Repair Would Not Function as Desired Due to Incorrect Assumption.Revised Fire Safe Shutdown Procedures (← links)
- 05000352/LER-1996-021-01, Forwards LER 96-021-01 Re Ability to Achieve Safe Shutdown in Event of Fire as Provided by Fire Protection Program (← links)
- 05000352/LER-1986-008, :on 860124,main Control Room Ventilation Sys Isolated & Emergency Fresh Air Sys Train a Started.Caused by Defective Analyzer Tape.Chlorine Detection Sys Installed (← links)
- 05000352/LER-1986-003, :on 860106,actuation of Nuclear Steam Supply Shutoff Sys Occurred.Caused by Placement of RHR Isolation Valve B in Test Position.Instrument & Control Technicians Responsible for Error Counseled on Procedures (← links)
- 05000352/LER-1986-001-01, :on 860102,two Low Water Level Reactor Scram Signals Occurred.Caused by Discrepancy Between wide-range & narrow-range Reactor Level Indications.Communication Between Reactor Operator & Panel Operator Enhanced (← links)
- 05000352/LER-1985-085, :on 851023,main Control Room Ventilation Sys Isolated & Train B of Emergency Fresh Air Sys Actuated. Caused by Failure of Optic Bulb of Chlorine Analyzer D (AE-78-016D).Bulbs Replaced (← links)
- 05000352/LER-1985-072, :on 850907,RWCU Sys Isolated Due to Outlet Vent Valve Failure.Caused by Rupture of Flow Glass Seals.Resin Discharged from Pressure Relief Valve.Startup Procedure S45.8.A Revised (← links)
- 05000352/LER-1985-100, :on 851226,hourly Fire Watch Insps for Four Reactor Encl Fire Barriers Not Performed within Required Time Frame.Caused by Negative Encl Pressure,Due to Supply Fan Trip,Preventing Opening of Airlock Doors (← links)
- 05000352/LER-1985-066, :on 850808,MSIV Isolation Signal & Full Scram Signal Generated.Caused by Operator Error in Changing from Shutdown to Startup Mode.Scram & Isolation Signal Reset (← links)
- 05000352/LER-1985-096, :on 851211,determined That Daily Surveillance Log (ST-6-107-590-1) Did Not Contain Readings for Control Room Fresh Air Radiation Monitors & Toxic Gas Monitors. Caused by Personnel Error (← links)
- 05000352/LER-1985-095, :on 851208,full Reactor Scram Occurred Due to High Neutron Flux.Caused by Loose Wires in Recirculation Pump B Motor Generator Control Circuit.Connection Screws & Circuit Tested (← links)
- 05000352/LER-1985-093, :on 851205,main Control Room Chlorine Isolation & Emergency Fresh Air Sys Actuation Occurred. Caused by Tape Breakage in Analyzer C.Analyzer Tape Repaired.New Detectors Temporarily Installed (← links)
- 05000352/LER-1985-094, :on 851207,main Control Room Chlorine Isolation & Emergency Fresh Air Sys Initiation Occurred.Caused by Failure of Toxic Chemical Analyzer Servo Mechanism. Isolation Reset.New Detector Installed (← links)
- 05000352/LER-1985-092, :on 851205,main Control Room Chlorine Isolation & Emergency Fresh Air Sys Actuation Occurred. Caused by Tape Breakage in Analyzer D.Analyzer Tape Repaired.New Sys Temporarily Installed (← links)
- 05000352/LER-1985-083, :on 851015,reactor Scrammed on Reactor Low Level.Caused by Licensed Operators Increasing Reactor Pressure Above Condensate Pump Discharge Pressure During Reactor Start Up & Procedure Deficiency (← links)
- 05000352/LER-1997-004, :on 841026,TS SRs for 10 Fire Rated Assemblies Had Not Been Satisfactorily Met Since Original start-up of Each Unit & 951220.Caused by Inadequate Reviews of Procedures.Procedures Reviewed (← links)
- 05000352/LER-1985-084, :on 851014,Tech Spec Requirement Re Min Number of Operable intermediate-range Monitors Violated.Caused by Licensed Control Room Personnel Error.Personnel Counseled (← links)
- 05000352/LER-1985-065, :on 850729,discovered That Alarm Setpoint Used for Toxic Phosgene Gas Detection Sys Nonconservative W/ Tech Spec 3.3.7.8.2 Limit.Caused by Foxboro Co Error in Equivalency Determination.Setpoint Decreased (← links)
- 05000352/LER-1996-019, :on 961026,capability to Reject Electrical Load of RHR Pump Not Fully Verified.Caused by Inadequate Test Procedure.Tests Will Be Revised Prior to Next Performance & TS Change Request Is Being Pursued (← links)
- 05000352/LER-1996-023, :on 950403,FPS Surveillance Tests Not Performed.Caused by Personnel Error.Individuals Involved Disciplined & New Supervisor Assigned to Onsite Fire Protection Group (← links)
- 05000352/LER-1996-018, :on 960925,single Train HPCI Sys Was Declared Inoperable Due to Loose Signal Cable Connector.Connector Was Replaced on 970102 & Common HPCI Turbine Maint Procedures Have Been Revised (← links)
- 05000352/LER-1996-018-01, Forwards LER 96-018-01 Which Discusses Event That Occurred on 960925 Re Inoperability of HPCI Sys Due to Loss of HPCI Turbine Speed Signal Caused by Loose Speed Sensor Connector (← links)
- 05000352/LER-1985-064, :on 850724,reactor Water Cleanup Pump B Tripped W/Both RHR Shutdown Cooling Loops Out of Svc for Testing & Maint.Caused by Suction Piping Becoming Airbound During Valve Realignment.Procedure Revised (← links)
- 05000352/LER-1996-022, :on 961102,D14 EDG Was Declared Inoperable Due to Low Fuel Oil in Storage Tank.Caused by Challenging Method for Determining Tank Level.Increased Operator Awareness of Potential for Error Is Being Utilized (← links)
- 05000352/LER-1996-022-01, Forwards LER 96-022-01 Re Event Which Occurred on 961102 Re Amount of Fuel Oil Contained in D14 EDG Fuel Oil Storage Tank.Challenging Method for Determining Tank Oil Level Resulted in Operator Obtaining an Incorrect Level Re (← links)
- 05000352/LER-1985-073, :on 850911,reactor Scrammed on Low Level Due to Feedwater Pump Trip on Low Suction Pressure & Isolation Signal Occurred.Caused by Loss of Condensate Pump B.Reactor Stabilized Using Trip Procedures T-99 & 100 (← links)
- 05000352/LER-1985-062, :on 850428,fire Watch Patrol of Svc Water Pipe Tunnel Exceeded 1 H Limit.Cause of Event Unknown Due to Long Time Span Between Occurrence & Discovery.Fire Watch Personnel Counseled (← links)
- 05000352/LER-1996-020, :on 961205,primary Containment Isolation Valves Inadvertently Closed Due to Personnel Error.Reopened Valves & Counseled Individual Involved on Work Techniques (← links)
- 05000352/LER-1985-071, :on 850824,reactor Water Cleanup Sys Isolated When Inboard Isolation Valve Received Spurious Signal from Differential Temp Switch TDTS-44-1N602E.Caused by Loose Switch Connection.Connector Cleaned (← links)
- 05000352/LER-1985-060, :on 850623,fire Watch Patrol Failed to Inspect Diesel Generator Bay B within 1 H Limit.Caused by Inoperable Card Reader to Prevent Access to Area.Fire Watch Switched (← links)
- 05000352/LER-1985-063, :on 850712,during Cold Shutdown,Esf Actuation Occurred.Caused by Broken Sample Tape of Chlorine Analyzer C (AE-78-016C) Due to Design Defect.Tape Repaired.Analyzer Tested & Returned to Svc (← links)
- 05000352/LER-1985-057, :on 850607,discovered Two Cables Not Encl by 3 H Fire Barriers.Caused by Incorrect Identification of Cables Requiring Encl During cable-by-cable Analysis.Cables Rerouted Into Raceways Encl by Fire Barriers (← links)
- 05000352/LER-1985-022, :on 841129,during Fire Damper Insp,Two Reactor Enclosure Fire Penetrations Discovered Unsealed.Caused by Failure to Reinstall Seal After Const Activities.Fire Watch Established.Conduit Penetration Seals Replaced (← links)
- 05000352/LER-1996-017, :on 960820,4 EDGs Inoperable Resulting from Separate Crankcase Pressurization Events.Caused by Plugging of Exhaust Stack Bird Screens by Rust Debris in Stream Gas Flow.Exhaust Stacks Scraped,Cleaned & Vacuumed (← links)
- 05000352/LER-1985-053, :on 850405,required Hourly Fire Watch Patrol Not Performed within Allotted Time for Switchgear Room 428. Caused by Personnel Error.Addl Practices to Facilitate Rapid Response by Personnel Outlined (← links)
- 05000352/LER-1985-059, :on 850616,ESF Actuation Occurred,Resulting in Isolation of Control Room Ventilation Sys.Caused by Broken Sample Tape in Control Room D Chlorine Detector.Tape Repaired.Isolation Reset (← links)
- 05000352/LER-1985-049, :on 850501,technicians Performing Turbine Control Valve Fast Closure Test Inadvertently Blew Fuse in Main Stop Valve Control Logic.Caused by Personnel Error. Fuse Replaced & Isolation Reset (← links)
- 05000352/LER-1985-048, :on 850430,isolation of Reactor Water Cleanup Sys,Primary Containment Instrument Gas Sys,Reactor Encl Ventilation Sys & RHR Shutdown Cooling Sys Occurred.Caused by Blown Fuse.Fuse Replaced (← links)
- 05000352/LER-1985-047, :on 850420,check Valve Manual Bypass Valve Discovered Open.Caused by Personnel Error.Personnel Informed of Recommended Method of Verifying Position of Bypass Valves.Locks Placed on Handles of Bypass Valve (← links)
- 05000352/LER-1985-044, :on 850410,auxiliary Equipment Room a Supply Fan Tripped Due to Electrical Interference.Caused by Radio Transmission from Portable Transmitter.Fire Watch Established & Transmitter Units Prohibited (← links)
- 05000352/LER-1985-046, :on 850423,w/unit in Cold Shutdown W/All Control Rods In,Reactor Full Scram Signal Occurred.Caused by Failure to Properly Remove Reactor Level Instrument from Svc.Use of Test Matrix Suggested (← links)
- 05000352/LER-1985-051, :on 850507,reactor Water Cleanup Sys Inboard Suction Valve Closed to Isolation Position When Simulated High Differential Flow Signal Inserted Into Isolation Logic. Caused by Personnel Error.Signal Cleared (← links)
- 05000352/LER-1985-058, :on 850611,discovered Failure to Check Diesel Generator Day Tank D-14 for Water on 850224,0408,0516 & 19.Caused by Personnel Oversight.Personnel Counseled & Procedure Revised (← links)
- 05000352/LER-1985-061, :on 850625,inboard Reactor Water Cleanup Isolation Valve Closed as Result of Signal from Temp Switch.Caused by Defective Solder Connection on Internal Component of Temp Switch.Repairs Made (← links)
- 05000352/LER-1993-001-02, :on 930109,inadvertent Actuation of Underfrequency Relay Resulted in Trip of RPS 1A Inverter Output Circuit.Caused by Jarring Motion to Relay.Temporary Change to Procedures Made (← links)
- 05000352/LER-1992-012, :on 920611,determined That Various Thermo-Lag fire-rated Barriers Inoperable Since Initial Installation. Caused by Design Defects.Fire Watches Posted.Addl Response Will Be Sent Per NRC Bulletin 92-001 (← links)
- 05000352/LER-1985-054, :on 850517,actuation Relay in Diesel Generator B Fire Suppression Release Control Panel Failed to Activate Deluge Valve.Caused by Taped Contacts.Tape Removed & Tests Successfully Completed (← links)
- 05000352/LER-1992-018-01, :on 921211,primary Containment Isolation Valve in Instrument Gas Sys Closed.Probably Caused by Stuck Microswitch within Pressure Differential Switch.Procedures Will Be Revised & Clarified (← links)
- 05000352/LER-1985-052, :on 850506,inadvertent Motor Start of Diesel Generator D-13 Occurred During Investigation of False Protective Relay Target Actuations.Caused by Improper Troubleshooting Methods Used by Personnel (← links)
- 05000352/LER-1985-050, :on 850506,main Control Room Chlorine Detector Failed.Caused by Breakage of Sample Tape in Detector Instrument.Tape Repaired,Analyzer Tested,Returned to Svc & Isolation Reset (← links)
- 05000352/LER-1988-011-01, :on 880326,RWCU Isolation Occurred on Nssss Due to High Differential Flow.Caused by Pressure Transient While Removing Filter Demineralizer from Svc.Isolation Reset & RWCU Returned to Operation (← links)
- 05000352/LER-1992-016, :on 920828,during Pressure Setpoint Testing of 14 Reactor Main Steam Sys Target Rock pilot-operated Valves, Only Two Valves Lifted within TS Limit.Caused by Corrosion Induced Bonding.Switch Options Reviewed (← links)
- 05000352/LER-1985-043, :on 850402,hourly Fire Watch Required for Missing Internal Conduit Seals for Telephone Lines Not Performed within Time Specified by Tech Spec 3/4.7.7.Caused by Personnel Error.Individual Counseled (← links)
- 05000352/LER-1985-042-01, :on 850402,w/unit in Startup at 2% Power,Esf Actuation Occurred.Caused by Control Room D Chlorine Detector Failure Due to Broken Sample Tape.Mods to Detector Under Investigation (← links)
- 05000352/LER-1996-009-01, :on 960422,main Steam System Safety Relief Valve Setpoint Drift Occurred.Caused by Corrosion Induced Bonding Between Pilot Disc & Seat.Installed Special Modified Pilot Disc in Several SRVs (← links)
- 05000352/LER-1996-015, :on 960726,failure to Maintain Equipment Needed for Operator Actions to Assure Fire Safe SD Capability. Caused by Unclear Ownership & Accountability of Procedures. Interim Procedure Revs Implemented (← links)
- 05000352/LER-1996-005, :on 960207,daily RECW Sys Fluid Sample Not Obtained & Analyzed within 24 H as Required by TS 3.3.7.1. Caused by Personnel Error & Inadequate Chemistry Section Sampling Program.Program Revised (← links)
- 05000352/LER-1996-016, :on 960725,core Thermal Power Exceeded Licensed Power Limit During Power Transient.Caused by Defective EHC Sys Component & Reactor Scram.Defective Primary Frequency/ Voltage Converter Replaced & Calibration Performed (← links)
- 05000352/LER-1985-036, :on 850327,AT&T Telephone Personnel Removed Telephone Fire Barrier Penetration Seals.Tech Spec 3.7.7 Action Statement 1 H Time Limit Not Met.Caused by Lack of Appropriate Telephone Installation Controls (← links)
- 05000352/LER-1985-045, :on 850401,License Condition 2.C.8.(b) Requiring SPDS Operability by 850401 Not Met.Caused by Incomplete Validation Process Pending 100% Power Level for Final Tests.Completion Schedule Proposed (← links)
- 05000352/LER-1985-041, :on 850401,reactor Encl HVAC Sys Isolated. Caused by Spurious Low Reactor Encl to Outside Air Differential Pressure Signal.Isolation Logic Reset & Current Loop Connections Cleaned & Inspected (← links)
- 05000352/LER-1985-037, :on 850326,during Cold Shutdown,Loca Signal Received,Resulting in LPCI Sys B Injection Into Reactor Vessel.Caused by Personnel Error.Technician Counseled on Proper Valving Techniques (← links)
- 05000352/LER-1985-038, :on 850328,inboard RHR Shutdown Cooling Suction Valve Received Isolation Signal.Caused by Procedural Inadequacy.Isolation Logic Reset & Shutdown Cooling Sys Returned to Svc (← links)
- 05000352/LER-1985-040, :on 850330,LOCA Signal Occurred During Cold Shutdown.Caused by Personnel Error.Personnel Counseled on Proper Method of Valving & Importance of Following Procedures.Surveillance Test Revised (← links)
- 05000352/LER-1985-039, :on 850330,ESF Actuated.Caused by False Low Reactor Water Level Signal Due to Personnel Error During Performance of Instrument Valve check-off List.Esf Reset & Proper Procedure Reviewed W/Personnel (← links)
- 05000352/LER-1985-033, :on 850321,discovered Required Hourly Fire Watch Not Performed within Allotted Times for RHR Room 102. Caused by Inadequate Communication Between Fire Watch Personnel.Training Session Conducted (← links)
- 05000352/LER-1992-017-01, :on 921012,isolation Signal Resulted in Actuations of Primary Containment & Rv Isolation Control Sys.Caused by Personnel Error.Special Training Session Held to Emphasize Mgts Work Practices (← links)
- 05000352/LER-1996-014, :on 960702,discovered Improperly Controlled Safeguards Information.Cause Undeterminate.Corrective Actions Will Be Provided by 960930 (← links)
- 05000352/LER-1985-032, :on 850314,fire Damper in Reactor Encl Found Held Open W/Wire During Cold Shutdown.Caused by Personnel Error.Damper Closed,Fusible Link Replaced,Damper Returned to Svc & Memo Issued (← links)
- 05000352/LER-1984-041, :on 841222,reactor Encl HVAC Isolated Simultaneous W/ Channel B Low Differential Pressure Annunciation.Caused by False Input Due to High Winds.Related Correspondence (← links)
- 05000352/LER-1984-040, :on 841221,reactor Protection Sys Channel B half-scram Occurred Coincident W/Full Outboard Isolation of Nuclear Steam Supply Shutoff Sys.Startup Procedure Revised (← links)
- 05000352/LER-1991-017-02, :on 910408,discovered That Fuse FU-10 Missing from Potential Transformer Circuit.Caused by Personnel Error.On 910613,second Offsite Source Incapable of Supplying Power to Safeguard Buses.Fuse Replaced (← links)
- 05000352/LER-1984-036, :on 841217,reactor Water Cleanup Sys Inboard Isolation Valve Closed to Isolation Position.Caused by Receipt of Signal from High Temp Differential Temp Logic. Isolation Signal Cleared (← links)
- 05000352/LER-1984-026, :on 841216,reactor Water Cleanup Sys (Rwcs) Outboard Isolation Valve Closed to Isolation Position.Caused by Receipt of Signal from High Differential Temp Logic Circuit.Isolation Signal Cleared & Rwcs Returned to Svc (← links)
- 05000352/LER-1984-029, :on 841220,automatic Isolation of Reactor Encl Ventilation Sys Occurred.Caused by Performance of Radiography Near Exhaust Radiation Monitors of Sys.Isolation Reset (← links)
- 05000352/LER-1984-012-02, :on 841215,reactor Water Cleanup Outboard Isolation Valve HV-44-1F004 Closed During Surveillance Testing of Temp Differential Transmitter Switch.Caused by Defect in Switch.Signal Cleared (← links)
- 05000352/LER-1985-028, :on 850301,determined That Internal Seals for Hot Gas & Smoke Protection Not Present in Conduits 1BI647,1CL048 & 1DL046.Hourly Fire Watch Established. Internal Conduit Seals Installed (← links)
- 05000352/LER-1984-034, :on 841212,reactor Water Cleanup Sys Outboard Isolation Valve HV-44-1F004 Closed Due to Spurious Isolation in Temp Differential Transmitter Switch TDTS-44-1N602S. Caused by Defective Switch.Signal Cleared (← links)
- 05000352/LER-1996-012, :on 921103,identified Improper Fuse Sizing. Caused by Personnel Error.Approved Design Change Re Proper Fuse Coordination & Reviewed Modifications Associated W/Fuse Ratings (← links)
- 05000352/LER-1996-013, :on 960521,Unit 1 Reactor Scram Occurred.Caused by Inadequate Procedural Guidance & Undetermined Equipment Malfunction.Procedure Will Be Revised to Ensure Appropriate Barriers,In Place to Minimize Risk of Scram (← links)
- 05000352/LER-1984-031, :on 841211,reactor Water Cleanup Sys Inboard Suction Valve Isolated.Caused by Inadvertent High Differential Flow Signal Due to Communication Failure Between Control Room & Test Area (← links)
- 05000352/LER-1984-032, :on 841211,reactor Water Cleanup Inboard Suction Valve Closed to Isolation Position Upon Receiving High Ambient Temp Signal.Caused by Personnel Error.Sys Returned to Svc (← links)
- 05000352/LER-1984-024, :on 841205,full Nuclear Steam Supply Shutoff Sys Group I Isolation Signal Produced.Caused by Combination of Procedural Deficiency & Personnel Error.Technician Counseled (← links)
- 05000352/LER-1984-033, :on 841211,failure of Control Room Chlorine Detector D Caused Normal Ventilation to Isolate & Train B of Control Room Emergency Fresh Air Sys to Start.Caused by Broken Sample Tape.Tape Repaired (← links)
- 05000352/LER-1984-028, :on 841209,control Room Chlorine Detector D Failed,Causing Normal Ventilation to Isolate & Train a of Control Room Emergency Fresh Air Sys to Start.Caused by Broken Sample Tape.Tape Repaired (← links)
- 05000352/LER-1985-023, :on 850205,reactor Encl Equipment Compartment B Exhaust Fan Failed,Resulting in Low Air Flow Rate & Low Differential Pressure.Caused by Loose Pneumatic Fitting on Fan.Fitting Tightened (← links)
- 05000352/LER-1985-026, :on 850228,spurious half-scram Signal on Reactor Protection Sys Channel a Occurred.Caused by Voltage Fluctuation from Voltage Regulator board.Half-scram Signal Reset & Hoods & Fans Installed (← links)
- 05000352/LER-1996-011, :on 960425,manual Operation of CREFAS Sys Resulted from Initiation of Toxic Chemical Detection Sys. Caused by Insufficient Guidance in Planning Process.Work Packages for Cleaning & Sealing Reviewed (← links)
- 05000352/LER-1996-006, :on 960207,control Room Emergency Fresh Air Sys Declared Inoperable.Caused by Flow Switch Coordination Deficiency.Flow Switches Adjusted,Station Guidance Revised & Site Staff Training Performed (← links)
- 05000352/LER-1985-024, :on 850208,spurious half-scram Signal on Reactor Protection Sys Channel B Occurred.Caused by Voltage Fluctuations from Voltage Regulator board.Half-scram Signal Reset (← links)
- 05000352/LER-1996-010, :on 960423,discovered Two Remote Shutdown Panel (RSP) Control Circuits Inoperable.Caused by Inadequate Procedures.Rsp Surveillance Test Procedures Revised by 960731 and RSP Cleaned by 960731 (← links)
- 05000352/LER-1984-018, :on 841128,liquid Radwaste Off/Vent Line Independent Sample Missed.Caused by Radwaste Effluent Monitor Being Out of Svc.Procedures Revised (← links)
- 05000352/LER-1985-020, :on 850130,reactor Encl HVAC Sys Isolated Upon Receiving Low Differential Pressure Signal.Caused by Temporary Circuit Alteration.Personnel Cautioned Not to Determinate Wires W/O Approval (← links)
- 05000352/LER-1984-022, :on 841129,two Reactor Encl Fire Penetrations Discovered Not Sealed.Caused by Failing to Reinstall Seal After Const Activities & Failure of Personnel to Recognize Use of Spare Conduit Would Result in Violation (← links)
- 05000352/LER-1984-023, :on 841129,reactor Protection Sys Initiated Full Scram While Reactor Vessel Hydrostatic Pressure Test Performed While Reactor Shut Down.Scram Caused by Reactor High Pressure Due to Operator Error (← links)
- 05000352/LER-1984-017, :on 841127,improper Setpoint for Chlorine Analyzer Trip Switch Found.Caused by Personnel Error.Calibr Performed Immediately & Personnel Counseled Re Procedures (← links)
- 05000352/LER-1985-015, :on 850118,sprinkler Sys for Cable Spreading Room Inoperable W/O Continuous Fire Watch.Caused by Inadequate Procedure for Hydrostatic Testing & Personnel Error.Procedure Issued & Personnel Counseled (← links)
- 05000352/LER-1984-013-03, :on 850117,HPCI Sys Steam Supply Pressure Instrument PT-55-1N058F Removed from Svc for Troubleshooting & Not Placed in Tripped Condition.Caused by Personnel Error. Requirements Clarified (← links)
- 05000352/LER-1985-014, :on 850118,reactor Protection Sys Scram Discharge Vol High Water Level Switch Resulted in Trip Channel Being Inoperable.Caused by Personnel Error. Written Warning Issued (← links)
- 05000352/LER-1985-010, :on 850112,reactor Water Cleanup Sys Inboard Suction Isolation Valve Closed When Nuclear Steam Supply Shutoff Sys Circuitry Was Deenergized.Caused by Faulty Jumper Installation (← links)
- 05000352/LER-1984-046, :on 841230,control Room Emergency Fresh Air Sys Train B Started.Caused by Sample Tape Breaking Causing Analyzer to Indicate Full Scale.Tape Repaired & Analyzer Tested & Returned to Svc (← links)
- 05000352/LER-1985-006, :on 850115,operator Opened Feeder Breakers Supplying Power to Motor Operators of Outboard & Inboard Suction Isolation Valves,Failing to Comply W/Primary Containment Isolation Requirements (← links)
- 05000352/LER-1985-011, :on 850116,fuse Supplying Power to Outboard Isolation Logic Relays in Nuclear Steam Supply Shutoff Sys Blew,Resulting in Isolation of Reactor Encl HVAC Sys.Caused by Electrical Short.Fuse Replaced (← links)
- 05000352/LER-1985-012, :on 850118,automatic Isolation of Reactor Encl HVAC Sys Occurred.Caused by Short Circuit Which Caused Fuse to Blow.Fuse Replaced,Isolation Reset & HVAC Sys Returned to Normal Mode of Operation (← links)
- 05000352/LER-1985-008, :on 850112,reactor Water Cleanup Sys Isolated. Caused by Blown Fuse in Nuclear Supply Shutoff Sys Logic. Fuse Replaced (← links)
- 05000352/LER-1985-009, :on 850112,HPCI Steam Supply Isolation Valve Isolated.Caused by Erratic Output from Temp Switch Due to Poor Connection within Switch.Wire Properly Reconnected & HPCI Declared Operable (← links)
- 05000352/LER-1996-009, :on 960314,five of Six as-found Setpoint Tests on Main Steam Sys SRVs Found Outside Required Pressure Ranges.Caused by Setpoint Drift Due to Corrosion Induced Bonding.Modified Pilot Disc Installed in SRVs (← links)
- 05000352/LER-1985-007, :on 850110,half Scram Signal on Reactor Protection Sys Occurred Causing Isolation & Tripping of Reactor Recirculation Pumps.Caused by Faulty Voltage Regulator Card.Card Replaced (← links)
- 05000352/LER-1985-005, :on 850108,reactor Encl HVAC Isolated Because of Low Differential Pressure.Possibly Caused by High Winds Providing False Input to Outside Sensing Leg.Isolation Reset & Ventilation Normalized (← links)
- 05000352/LER-1985-004, :on 850106,during Startup,Transmitter Trip Unit Alarm Light Indicated Gross Fail/Inop for One HPCI Low Steam Pressure Transmitter PT-55-IN058F.Pressure Transmitter Repaired (← links)
- 05000352/LER-1985-002, :on 850104,spurious Isolation of Reactor Water Cleanup Sys Occurred.Caused by High Differential Flow Between Sys Inlet & Outlet While Valving Filter/ Demineralizer B Into Svc.Isolation Reset (← links)
- 05000352/LER-1985-003-01, :on 850105,nuclear Steam Supply Shutoff Isolation Signal Resulted in Isolation of Reactor Water Cleanup Outboard Valve.Caused by Inadvertent High Differential Flow Signal (← links)
- 05000352/LER-1984-045, :on 841230,reactor Encl HVAC Isolated Due to Low Differential Pressure.Caused by False Input in Differential Pressure Sensors Due to High Winds.Isolation Reset & HVAC Sys Restarted (← links)
- 05000352/LER-1985-042, :on 841231,during Startup,Drywell Radiation Monitoring Sys Supply & Return Isolation Valves SV-026-190A & SV-026-190C Failed to Close Automatically.Caused by Incorrect Wiring.Control Logic Rewired (← links)
- 05000352/LER-1984-035, :on 841216,prior to Initial Criticality, Spurious Isolation of Reactor Water Cleanup Sys Occurred. Caused by Steam Leak Detection Sys Temp Switch Trip. Isolation Reset (← links)
- 05000352/LER-1984-039, :on 841221,reactor Water Cleanup Sys,Reactor Encl & Refuel Floor Ventilation Sys Isolated.Caused by Overvoltage of Static Inverter.Scram Reset (← links)
- 05000352/LER-1992-013, :on 920624,determined That RHR HX Failed Heat Transfer Capacity Test,Per Generic Ltr 89-13.Caused by HX Fouling & Leaking RHR HX 1B Bypass Valve.Restricting Orifice Removed to Allow Increased Flow (← links)
- 05000352/LER-1985-001-01, :on 850101,reactor Water Cleanup Sys Outboard Isolation Valve Closed to Isolation Position.Caused by Signal from High Temp Logic Circuit of NSSS Due to Temp Switch Setting on Read.Sys Returned to Svc (← links)
- 05000352/LER-1984-043, :on 841228,discovered Closure of Valve SV-52-139 Could Not Be Verified for Prior Period.Caused by Containment Atmospheric Control Valve Not Properly Measuring Valve Stroking Time (← links)
- 05000352/LER-1984-044, :on 841229,RHR Sys Shutdown Cooling Loop a Blocked Out of Svc for Maint W/No Alternate Method of DHR Demonstrated.Caused by Personnel Error.Block on Loop a Cleared (← links)
- 05000352/LER-1992-011, :on 920605,inoperabilty of Channel B of Main Steam Line Radiation Monitoring Sys Occurred as Result of Inadequate Electrical Separation.Wiring Sleeved on 920629 (← links)
- 05000352/LER-1984-020, :on 841123,main Control Room Ventilation Sys Isolated.Caused by Inadvertent Trip of D14 Emergency Bus. Isolation Reset & Ventilation Returned to Normal (← links)
- 05000352/LER-1984-015-01, :on 841126,outboard RHR Shutdown Cooling Valves Isolated.Caused by Procedural Deficiency During Surveillance Testing.Shutdown Cooling Mode Restored at End of Test (← links)
- 05000352/LER-1984-014-02, :on 841121,reactor Encl Isolated Due to Low Differential Pressure Resulting from HVAC Sys Deenergizing. Caused by Operator Deenergizing Circuit Which Provides Power to Temp Switches.Operator Counseled (← links)
- 05000352/LER-1984-019, :on 841126,inboard RHR Shutdown Cooling Suction Valve Isolated.Caused by Inadvertent Actuation of One Reactor Steam Dome High Pressure Switch.After Isolation Signal Cleared,Rhr Sys Returned to Normal (← links)
- 05000352/LER-1984-016-01, :on 841126,loop B Recirculation Pump Motor Started W/O Test.Caused by Personnel Error.Investigation Showed Process to Be within Tech Specs (← links)
- 05000352/LER-1992-010, :on 920605,north Stack wide-range Accident Monitor Discovered Inoperable & Unable to Perform Design Function Since 920507.Caused by Equipment Malfunction & Procedure Deficiency.Procedure Revised (← links)
- 05000352/LER-1996-008, :on 960303,HPCI,ESFA & Condition Which Could Have Prevented Intended Safety Function Occurred Due to Personnel Error.Issued Event Training Bulletin to All I&C Technicians by 960415 (← links)
- 05000352/LER-1984-013-02, :on 841120,outboard Isolation Valve for Shutdown Cooling Line Failed to Respond to Open Signal from Remote Shutdown Panel.Caused by Mechanical Interference. Lead Repositioned (← links)
- 05000352/LER-1996-007, :on 960220,trip of FPC Pumps Resulted in Loss of Core Circulaton & Decay Heat Removal.Caused by Insufficient Procedural Guidance.C/A:Assessment Performed (← links)
- 05000352/LER-1984-011-02, :on 841118,during Surveillance Testing,Short Circuit Tripped Power Supply & Damaged High Radiation Monitor D.Caused by Technician Accessing Internals of Instruments.Monitor Repaired & Power Reset (← links)
- 05000352/LER-1984-006-02, :on 841113,main Control Room Ventilation Sys Received Isolation Signal Because of Temporary Loss of Power to Chlorine Analyzer A.Isolation Caused by Cycling Feed Switch to Chlorine Analyzer a (← links)
- 05000352/LER-1984-009-02, :on 841116,svc Water Sys Effluent Line Gross Radioactivity Sample Not Obtained within 8 H Period as Required by Tech Specs.Caused by Failure to Adequately Address Obtaining Samples from Alternate Point (← links)
- 05000352/LER-1996-006-01, Forwards LER 96-006-01 Re Multiple Instances of Loss of Safety Function of Control Room Emergency Fresh Air Sys, Resulting in Operating Conditions Prohibited by Tech Specs (← links)
- 05000352/LER-1984-008-02, :on 841115,main Control Room Chlorine Analyzer Failed.Caused by Equipment Malfunction & Sample Tape Breaking,Causing Indicator to React full-scale.Broken Tape Replaced & Analyzer Recalibr (← links)
- 05000352/LER-1984-021, :on 841115,fuse Blew,Causing Isolation of Reactor Water Cleanup Sys.Caused by Inboard Isolation Logic Relay Fuse Burnout from Electrical Short in Visicorder Test Cable Plug.Fuse Replaced & Sys Restored (← links)
- 05000352/LER-1984-007-02, :on 841114,core Spray Pump C,Rhr Pump C & Diesel Generator D13 Automatically Started.Caused by Improper Venting of Reactor Level Instrument Rack.Low Signal Cleared & Sys Returned to Operation (← links)
- 05000352/LER-1984-005-02, :on 841109,noncoincident Full Scram Signal Occurred.Caused by Failed Metal Bond Securing Inductor L507 to Mounting Bracket.Panel Feeder Breakers 1BY160 Replaced (← links)
- 05000352/LER-1996-003, :on 960204,ESFA Occurred Due to Loss of Power to Rps/Ups Power Distribution Panel Caused by Spurious Actuation of Underfrequency Relay.Replaced Relay (← links)
- 05000352/LER-1996-004, :on 960206,reactor Scram Signal Occurred While in Hot Shutdown Due to Operator Error During Depressurization.Provided Briefing Sheet to Operations Managers (← links)
- 05000352/LER-1984-004-02, :on 841106,documented Monthly Insp of Four Fire Hose Stations Not Performed.Caused by Procedural Deficiency in Surveillance Test ST-7-022-951-0.Omitted Fire Hose Stations Inspected & Procedure Revised (← links)
- 05000352/LER-1984-002-02, :on 841031,during Fuel Loading W/Reactor at 0% Power & Control Rods Fully Inserted,Full Scram Occurred W/Audible Alarm Indicating Upscale Trip of IRM Channel B. Caused by Personnel Error.Technician Counseled (← links)
- 05000352/LER-1984-003-02, :on 841031,prior to Initial criticality,CO2 Pilot Gas Supply Valve to Control Valve for Control Room Low Pressure CO2 Hose Racks OHR601 & OHR602 Found Closed Rendering Equipment Inoperable.Valve Opened (← links)
- 05000352/LER-1984-001-01, :on 841027,channel Checks of Four Scram Discharge Vol Level Transmitters & Four Ventilation Exhaust Duct Radiation Monitors Not Performed.Caused by Procedural Deficiency.Procedures Clarified (← links)
- 05000352/LER-1995-011, :on 951227,ESF Actuation Resulting from RWCU Sys Isolation.Caused by Unexpected Acute Failure of High B RWCU Pump Seal.Replaced Pump Seal (← links)
- 05000352/LER-1985-025, :on 850211,spurious Isolation of Reactor Water Cleanup Sys Occurred.Cause of Isolation Under Investigation. Disturbance Analyzer Will Be Installed in Inboard & Outboard Reactor Water Cleanup Sys Isolation Logics (← links)
- 05000352/LER-1985-019, :on 850129,discovered HPCI Room Differential Temp Switch W/Reversed Thermocouple Leads.Caused by Unlabeled Reversed Thermocouple Wires.Thermocouple Wire Labeled & Connected to Proper Terminals (← links)
- 05000352/LER-1985-021, :on 850131,while in Startup Condition & at 3.5% Power,Spurious Full Scram Occurred.Caused by Pressure Decrease.Scram Signals Reset (← links)
- 05000352/LER-1992-015, :on 920707,HPCI Sys Turbine Stop Valve Closed & Reopened Several Times.Caused by Malfunction of Hydraulic Mechanical Ovespeed Trip Mechanism.Hpci Sys Maint Procedures Will Be Revised & Sys Flushed (← links)
- 05000352/LER-1985-017, :on 850124,main Control Room Ventilation Sys Operated Outside Design Basis for 2 H Period.Caused by Blocked Inlet & Outlet Isolation Valves.Blocking Sequences for Ventilation Sys Will Be Reviewed (← links)
- 05000352/LER-1992-014, :on 901116,continuous Fire Watch Not Implemented Upon Discovery of Inoperable Thermo-Lag Fire Rated Barriers.Caused by Personnel Error.Fire Watch Posted, on 920626,as Result of NRC Bulletin 92-001 (← links)
- 05000352/LER-1985-018, :on 850126,reactor Encl Ventilation Isolation Sys A,Recirculation Sys & Standby Gas Treatment Sys Initiated.Caused by Failure to Isolate Refuel Floor Differential Transmitter (← links)
- 05000352/LER-1985-016-01, :on 850122,HPCI Outboard Steam Supply Isolation Valve HV-55-1F003 Closed.Caused by Technician Short Circuiting Volt Meter Energizing Relay Which Generates Isolation Signal for Valve (← links)
- 05000352/LER-1995-007-01, :on 950902,TS Condition in Unit 1 a & B & Unit 2 B H Recombiners Inoperable Due to Inadequate post-mod Test Caused by Personnel Error.Conducted All Hands Meeting & Maint Training Analysis (← links)
- 05000352/LER-1995-006-01, :on 950828,unusual Event & RPS Actuation Occurred After Reactor Manually Shutdown Due to Leak Into Primary Contaiment & Temporary Loss of Normal Startup Level Control Valve.Conducted All Hands Meeting (← links)
- 05000352/LER-1995-005-01, :on 950827,RCIC Sys Isolation Occurred Due to Water Flow Transient in RCIC Steam Supply Line.Caused by Lack of Procedural Guidance.Appropriate Sys Procedures Will Be Developed for Rcic,Hpci & Main Steam sys.W/9509926 Ltr (← links)
- 05000352/LER-1992-009, :on 920515,Loop a of Emergency Svc Water Sys Declared Inoperable During Testing of Discharge Check Valves.Caused by Failure to Perform Adequate Daily Review of Log.Detailed Review of Log Performed (← links)
- 05000352/LER-1996-001, :on 960111,automatic Isolation of RCIC Sys During Surveillance Testing Occurred Due to Less than Adequate Attention to Details.Counseled Technician & Held Team Meetings to Discuss Event (← links)
- 05000352/LER-1996-002, :on 960118,unit Operated in Excess of 100% Rated Power Due to Core Thermal Power Calculation Methodology Error.Reactor Heat Balance Revised (← links)
- 05000352/LER-1992-008-01, :on 920506,condition Prohibited by TS in That SRs Were Not Met for Certain fire-rated Encapsulations. Caused by Drawing & Procedural Deficiencies.Procedures ST-7-022-920-1 & 2 Will Be Revised (← links)
- 05000352/LER-1995-010-01, :on 951223,manual U/1 Sci W/Operation of Common Plant SGTS & U/1 Reactor Encl Recirculation Sys Esfa Occurred Due to Equipment Problems.Removed Re HVAC Sys from Operation (← links)
- 05000352/LER-1992-005-01, :on 920415,security System Experienced Unscheduled Outage & Firewatch Insp Not Performed.Caused by Cognitive Personnel Error in Security.Security Shift Sergeant Counseled (← links)
- 05000352/LER-1992-006-01, :on 920417 & 28,main Control Room Annunicator Alarm Received Indicating High Toxic Gas Concentration in Fresh Air Intake.Cause Undetermined.Preventive Maint Program for Toxic Chemical Analyzers Implemented (← links)
- 05000352/LER-1992-007-01, :on 920423,main Control Room Ventilation Sys Chlorine Isolation Manually Initiated in Response to Rising Concentration in Chlorine Detection Sys.Caused by Offsite Release of Chlorine.Chlorine Sys Reset (← links)
- 05000352/LER-1995-009-01, :on 951113,pressure Setpoint Drift of Ms Sys Safety Relief Valves Occurred.Caused by Corrosion Induced Bonding Between Pilot Disc Seating Surfaces.Several Modified SRV Pilot Discs Installed (← links)
- 05000352/LER-1992-003-02, :on 920321,ESF Actuation Occurred After Chemistry Technician Inadvertently Entered Incorrect Values in Computer & Alarm on Computer Sounded.Caused by Personnel Error.Technician Counseled & Memo Issued (← links)
- 05000352/LER-1992-004-01, :on 920321,reactor Encl Supply Fans Failed to Trip,Resulting in High Reactor Encl Differential Pressure. Caused by Overpressurization Transient Causing Blowout Panel to Open.Mod to Setpoint Implemented (← links)
- 05000352/LER-1991-018, :on 910618,primary Containment & Reactor Vessel Isolation Control Sys Actuations Occurred.Caused by Loss of Power to Distrubution Panel.Preventive Maint Tasks Written to Replace Inductors in Inverters Annually (← links)
- 05000352/LER-1990-019-02, :on 900915,diesel Generator Surveillance Test Failure Reported.Diagnostic Testing Inconclusive on Cause & No Subsequent Failure Noted.No Addl Corrective Actions Planned (← links)
- 05000352/LER-1990-033-01, :on 901205,60-amp Power Supply Fuse in Panel 1AY160 Unexectedly Blew,Resulting in Actuation of Primary Containment & Esf.Caused by Wiring Installation Deficiency. Wiring Corrected & New Fuse Installed (← links)
- 05000352/LER-1990-030-01, :on 901202,actuation of Reactor Protection Sys Occurred During Performance of Surveillance Test Procedure ST-6-001-660-1.Caused by Inadequate Procedure.Procedure Revised (← links)
- 05000352/LER-1995-008-01, :on 950911,unusual Event Declared & RPS Actuated When Reactor Manually Shutdown Due to Inadvertent Opening of Ms SRV M.Caused by Pilot Valve Seat Leakage.Srv M & Four Other SRVs Removed & Replaced (← links)
- 05000352/LER-1995-004, :on 950728,actuations of Units 1 & 2 PCRVICS Resulted from Blown Fuse.Issued Station Bulletin to All LGS Supervision (← links)
- 05000352/LER-1992-001-02, :on 920129,high Toxic Chemical Concentration Alarm Received in Main Control Room.Caused by High Vinyl Chloride Concentration in Outside Air Intake Plenum.No Corrective Actions Necessary (← links)
- 05000352/LER-1991-030-01, :on 911230,TS Limiting Condition for Operation & Surveillance Requirement for Temp & Time Exceeded During Reactor Recirculation Pump Start.Caused by Personnel Error. Personnel Counseled (← links)
- 05000352/LER-1995-004-01, :on 950728,actuations of Units 1 & 2 PCRVICS Resulted from Blown Fuse When I&C Technician Inadvertently Grounded Starter Screwdriver.Performed Review of Appropriate I&C ST Procedures to Identify Physical Mods (← links)
- 05000352/LER-1991-028-01, :on 911218,HPCI Sys Steam Supply Inboard Isolation Valve Did Not Open.Caused by Motor Failure in Operator Gear Spring Pack.Valve Motor & Spring Pack Replaced (← links)
- 05000352/LER-1991-027-01, :on 911112,inadvertent Actuation of Primary Containment & Reactor Vessel Isolation Control Sys Resulted in Closure of Gas Analyzer Sample Lines to Drywell.Cause Undetermined.Defective Relay Replaced (← links)
- 05000352/LER-1991-026-01, :on 911112,electrical Lead from Primary Containment Isolation Valve to Combustible Gas Analyzer Inadvertently Grounded.Caused by Blown Fuse in Panel. Personnel Counseled & Mgt Directive Issued (← links)
- 05000352/LER-1991-025-01, :on 911103 & 18,personnel Received Main Control Room Annunciator Alarm Indicating High Toxic Gas Concentration in Fresh Air Intake.Caused by Momentary High Toxic Concentration Indication (← links)
- 05000352/LER-1992-002-03, :on 920311,cooling Fan for E21-K601D Inverter Discovered Inoperable Due to Normal Wear.On 920314,subj Inverter Removed from Svc & HPCI Sys Declared Inoperable. Cooling Fan for E21-K601D Inverter Replaced (← links)
- 05000352/LER-1991-009, :on 910412,reactor Scram Resulted from Spurious Loss of Dc Electrical Power Supply to Main Turbine EHC Sys Due to Personnel Error.Copper Links Replaced W/Hard Wire Connectors (← links)
- 05000352/LER-1995-003-01, :on 950719,Unit Maximum Power Level of 100% Was Exceeded by 3.4% Due to Unanticipated Response of 1B Reactor Recirculation Pump Following Decrease Speed Signal. Established Administrative Limit of 100% Core Flow (← links)
- 05000352/LER-1995-002-01, :on 950221,dual Unit Scram Occurred Due to Offsite Electrical Transmission Disturbance.Changed Ground Fault Detection Relay Setttings for LGS Units 1 & 2 Main Transformers to Provide Better Coordination W/Sys Equipment (← links)
- 05000352/LER-1991-023-01, :on 911007,reactor Protection Sys Inverter Output Circuit Breaker Tripped,Causing Loss of Power to Power Distribution Panel.Caused by Actuation of Relay. Alternate Test Method Under Development (← links)
- 05000352/LER-1991-024, :on 911025,determined That RCIC Sys Was Potentially Affected by Physical Separation Deficiencies. Caused by Personnel Error.Developed Special Training Program Explaining Electrical Separation (← links)
- 05000352/LER-1991-022-01, :on 910917,operator Inadvertently Removed RHR Pump 1C Power Supply Breaker from Cubicle,Resulting in Inoperability of LPCI Subsystem.Caused by Personnel Error. Operator Disciplined & Individuals Counseled (← links)
- 05000352/LER-1991-018-01, :on 910618,automatic Actuations Occurred of Unit 1 Primary Containment & Reactor Vessel Isolation Control.Caused by Inadequate Design.Inverter Inductor Replaced (← links)
- 05000352/LER-1991-020-01, :on 910813,two Similar ESF Actuation Events Occurred After Reactor Water Level Indicating Switch Tripped Twice within Same Day.Cause of First Event Unknown & Second Event Caused by Personnel Error (← links)
- 05000352/LER-1991-017-01, :on 910613,determined Unit 2 Had Operated in Condition Prohibited by TS 3.8.1.1 Due to 910408 Discovery of Missing Fuse from Transformer Circuit That Feeds 201 Safeguards Transformer Avc.Fuse Replaced (← links)
- 05000352/LER-1991-014-01, :on 910530,failure to Perform Tech Spec Surveillance Requirements Rendered Assemblies Inoperable. Caused by Personnel Error.Fire Damper Reviewed & Penetration Seal Surveillance Test Conducted (← links)
- 05000352/LER-1995-002, :on 950221,reactor Protection Systems Actuated as Result of Trips of Main Turbines.Caused by Breaker Failure & Voltage Spike.Ground Fault Detection Relay Settings Being Evaluated (← links)
- 05000352/LER-1991-002-04, Has Been Withdrawn.Analysis Concluded That W/ Main Control Room HVAC Sys in Radiation Isolation Mode, Automatic Chlorine Isolation Not Required to Satisfy GDC 19 of 10CFR50,App a in Event of Chlorine Release (← links)
- 05000352/LER-1990-003, :on 900208,HPCI Sys Inboard Isolation Valve Isolated During Isolation Logic Surveillance Test.Caused by Mfg Error.Program for Replacement/Rework of Trip Units Being Implemented.Estimated Completion Date Dec 1993 (← links)
- 05000352/LER-1991-021-01, :on 910829,high Toxic Chemical Concentration Alarm Received in Main Control Room,Resulting in Control Room Ventilation Sys Isolation.Caused by Inadequate Procedural Guidance.New Procedure Written (← links)
- 05000352/LER-1991-007, :on 910226,determined That Tech Specs Surveillance Requirement Had Not Been Satisfied for Tech Spec Section 3.7.7.Caused by Personnel Error.Appropriate Steps Taken to Satisfy Tech Specs Actions (← links)
- 05000352/LER-1991-016-01, :on 910610,reactor Pressure Increased Above 150 Psig W/Rcic Sys Inoperable.Caused by Main Control Room (MCR) Shift Supervisor Failure to Comply W/Startup Procedure GP-2. MCR Shift Supervisor Counseled (← links)
- 05000352/LER-1991-012, :on 910508,reactor Encl Overpressurized & Blowout Panel Opened Due to Failure of C Reactor Encl HVAC Supply Air Fan.Fan Power Supply Breaker Trip Coil Replaced & Satisfactorily Tested (← links)
- 05000352/LER-1995-001-01, :on 950105,unexpected Malfunction of Rps/Ups Static Inverter Sys Control Board Resulted in PCRVICS & Other Engineered Safety Feature Actuations.Sys Control Board Was Replaced (← links)
- 05000352/LER-1994-013, :on 941208,discovered That Isolation Valves Closed.Caused by Personnel Error Re Inadequate Position Verifications.Insp of Isolation Valves for Remaining Level Switches Performed Immediately (← links)
- 05000352/LER-1991-019-01, :on 910716,ESF Actuation Occurred Due to Loss of Power Distribution Panel.Caused by Spurious Actuations of Underfrequency Relay.Relay Replaced & Evaluation Performed Investigating Revs to Breaker Trip Logic (← links)
- 05000352/LER-1991-011, :on 910430,discovered That TS Surveillance Requirement for Two Safeguards Bus Undervoltage Relays Not Met Since 910425.Caused by Personnel Errors & Deficient Instructions.Communication Guidelines Revised (← links)
- 05000352/LER-1994-012, :on 941027,failure to Perform Weekly Surveillance Insp of Safeguard Battery Pilot Cell Occurred. Caused by Personnel Error.Verbal & Written Communications Issued to Appropriate Operations Personnel (← links)
- 05000352/LER-1991-006, :on 910218,discovered That on 910217,primary Containment & Reactor Vessel Isolation Control Sys Actuated, Resulting in Generation of Radiation Isolation Signal.Caused by Personnel Error.Advisors Counseled (← links)
- ML081330250 (redirect page) (← links)
- 05000352/LER-2008-004, Remote Shutdown Procedure Error (← links)
- 05000352/LER-2008-003, High Pressure Coolant Injection System Instrument Power Supply Failure (← links)
- 05000353/LER-2008-003, Re Condition Prohibited by Technical Specifications Due to Inoperable Radiation Monitor (← links)
- 05000352/LER-2008-002, Automatic Actuation of Reactor Protection System Due to Invalid Power/Load Unbalance Condition (← links)
- 05000353/LER-2008-002, Re Automatic Actuation of the Reactor Protection System at Power (← links)
- 05000353/LER-2008-001, Valid Actuation of the D23 Emergency Diesel Generator Bus Undervoltage Logic (← links)