Pages that link to "05000331/LER-2009-002, Manual Reactor Scram Due to Loss of Condenser Cooling"
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The following pages link to 05000331/LER-2009-002, Manual Reactor Scram Due to Loss of Condenser Cooling:
Displayed 5 items.
- 05000331/LER-2009-002 (redirect page) (← links)
- ML090680039 (redirect page) (← links)
- 05000331/LER-2009-001 (redirect page) (← links)
- 05000331/LER-1982-043, Forwards LER 82-043/03L-0 (← links)
- 05000331/LER-1982-040, Forwards LER 82-040/03L-0 (← links)
- 05000331/LER-1982-039, Forwards LER 82-039/03L-0 (← links)
- 05000331/LER-1982-041, Forwards LER 82-041/03L-0 (← links)
- 05000331/LER-1982-036, Forwards LER 82-036/03L-0 (← links)
- 05000331/LER-1982-037, Forwards LER 82-037/03L-0 (← links)
- 05000331/LER-1982-034, Forwards LER 82-034/01T-0 (← links)
- 05000331/LER-1982-033, Forwards LER 82-033/03L-0 (← links)
- 05000331/LER-1982-024, Forwards LER 82-024/03L-0 (← links)
- 05000331/LER-1982-023, Forwards LER 82-023/03L-0 (← links)
- 05000331/LER-1982-065, Forwards LER 82-065/03L-0 (← links)
- 05000331/LER-1982-056, Forwards LER 82-056/01T-0 (← links)
- 05000331/LER-1982-055, Forwards LER 82-055/03L-0 (← links)
- 05000331/LER-1983-003, Forwards LER 83-003/03L-0 (← links)
- 05000331/LER-1982-052, Forwards LER 82-052/03L-0 (← links)
- 05000331/LER-1982-082, Forwards LER 82-082/03L-0 (← links)
- 05000331/LER-1982-059, Forwards LER 82-059/03L-0 (← links)
- 05000331/LER-1982-058, Forwards LER 82-058/03L-0 (← links)
- 05000331/LER-1982-057, Forwards LER 82-057/03L-0 (← links)
- 05000331/LER-1982-054, Forwards LER 82-054/03L-0 (← links)
- 05000331/LER-1982-053, Forwards LER 82-053/03L-0 (← links)
- 05000331/LER-1982-050, Forwards LER 82-050/03L-0 (← links)
- 05000331/LER-1982-038, Forwards LER 82-038/03L-0 (← links)
- 05000331/LER-1982-035, Forwards LER 82-035/03L-0 (← links)
- 05000331/LER-1982-049, Forwards LER 82-049/03L-0 (← links)
- 05000331/LER-1982-048, Forwards LER 82-048/03L-0 (← links)
- 05000331/LER-1982-047, Forwards LER 82-047/01T-0 (← links)
- 05000331/LER-1982-046, Forwards LER 82-046/03L-0 (← links)
- 05000331/LER-1982-045, Forwards LER 82-045/03L-0 (← links)
- 05000331/LER-1982-044, Forwards LER 82-044/03L-0 (← links)
- 05000331/LER-1983-001, Forwards LER 83-001/03L-0 (← links)
- 05000331/LER-1982-083, Forwards LER 82-083/03L-0 (← links)
- 05000331/LER-1982-081, Forwards LER 82-081/03L-0 (← links)
- 05000331/LER-1982-076, Forwards LER 82-076/03L-0 (← links)
- 05000331/LER-1982-061, Forwards LER 82-061/03L-0 (← links)
- 05000331/LER-1982-062, Forwards LER 82-062/03L-0 (← links)
- 05000331/LER-1982-063, Forwards LER 82-063/03L-0 (← links)
- 05000331/LER-1983-005, Forwards LER 83-005/03L-0 (← links)
- 05000331/LER-1982-077, Forwards LER 82-077/03L-0 (← links)
- 05000331/LER-1982-079, Forwards LER 82-079/03L-0 (← links)
- 05000331/LER-1982-073, Forwards LER 82-073/03L-0 (← links)
- 05000331/LER-1982-072, Forwards LER 82-072/03L-0 (← links)
- 05000331/LER-1982-070, Forwards LER 82-070/03L-0 (← links)
- 05000331/LER-1982-067, Forwards LER 82-067/03L-0 (← links)
- 05000331/LER-1982-069, Forwards LER 82-069/03L-0 (← links)
- 05000331/LER-1982-066, Forwards LER 82-066/03L-0 (← links)
- 05000331/LER-1982-080, Forwards Updated LER 82-080/03X-1 (← links)
- 05000331/LER-1983-002, Forwards LER 83-002/03L-0 (← links)
- 05000331/LER-1983-027, /01T-0:on 830803,during Surveillance Required by Inoperable RCIC (LER 83-027),speed Indication for HPCI Turbine Failed.Caused by Faulty Turbine Magnetic Speed Pickup.Turbine Oil Sys Adjusted (← links)
- 05000331/LER-1983-008, Forwards LER 83-008/03L-0 (← links)
- 05000331/LER-1982-064, Forwards LER 82-064/03L-0 (← links)
- 05000331/LER-1981-016, Updated LER 81-016/01T-1:on 810421,lower Crankshaft Thrust Bearing 13 & Adjacent Bearing 12 Found Wiped on Journal Surface.Caused by High Temp.Crankshaft Thrust Bearings Replaced & Crankshaft Relapped (← links)
- 05000331/LER-1981-015, Updated LER 81-015/01T-1:on 810421,lower Crankshaft 14 Bearing Found Wiped on Journal Surface Similar to Problem Identified on Diesel 1G-31.Caused by High Temp.Bearing Replaced & Crankshaft Relapped (← links)
- 05000331/LER-1983-004, Forwards LER 83-004/03L-0 (← links)
- 05000331/LER-1983-006, Forwards LER 83-006/03L-0 (← links)
- 05000331/LER-1983-007, Forwards LER 83-007/03L-0 (← links)
- 05000331/LER-1983-009, Forwards LER 83-009/03L-0 (← links)
- 05000331/LER-1982-075, Forwards Updated LER 82-075/03X-1 (← links)
- 05000331/LER-1997-008, Forwards LER 97-008-00 Re Momentary Loss of Secondary Containment During Routine Maint Activity.Ltr Contains Listed Commitment (← links)
- 05000331/LER-1981-014, Forwards Updated LER 81-014/01X-1 (← links)
- 05000331/LER-1982-031, Forwards Updated LER 82-031/03X-1 (← links)
- 05000331/LER-1981-021, Forwards Updated LER 81-021/03X-1 (← links)
- 05000331/LER-1982-078, Forwards Updated LER 82-078/03L-1 (← links)
- 05000331/LER-1980-065, Forwards Updated LER 80-065/03X-1 (← links)
- 05000331/LER-1982-042, Forwards LER 82-042/03L-0 (← links)
- 05000331/LER-2020-001-01, Notice of Unusual Event and Unit Trip Due to Loss of Offsite Power Due to High Winds (← links)
- 05000331/LER-2020-001, Notice of Unusual Event and Unit Trip Due to Loss of Offsite Power Due to High Winds (← links)
- 05000331/LER-1998-006, :on 980519,discovered That Visual Exam Had Not Been Performed on Standby Liquid Control Sys Explosive Valves Prior to Returning Sys to Svc.Caused by Failure to Identify Requirement to Perform VT-2 Exam.Procedure Revised (← links)
- 05000331/LER-1998-005, :on 980429,determined That CAC Sys Hydrogen & Oxygen Monitors Were Technically Inoperable in Past.Caused by Inadequate Implementation of Original Design Requirements.Implemented Correction Factor Chart (← links)
- 05000331/LER-1998-004, :on 980502,noted That Five of Eight Valves Failed to Meet Setpoint Requirements.Caused by Inadequate Corrective Actions.Replaced MSRVs Pilots & MSSVs W/Valves That Were Previously Set Pressure Tested (← links)
- 05000331/LER-1989-006, :on 890224,isolation of RCIC & on 890302, Isolation of HPCI Occurred.Caused by Problems in Electrical Path from Thermocouples Monitoring Area Temp.Retermination of Broken Thermocouple Wire Before Break (← links)
- 05000331/LER-1998-003, :on 980410,invalid Esfas of Group III PCIS Was Noted.Caused by Procedure Deficiencies & Loss of Instrument AC Control Power.Revised Procedures & Reviewed Electrical Panel Labels & Associated Operating Procedures (← links)
- 05000331/LER-1988-014, Has Been Canceled.Resolution of LERs Missing from Lertrk/Scss/Dcs Discussed (← links)
- 05000331/LER-1998-007, :on 980505,potential HPCI Room Corridor Wall Steam Leakage During High Energy Line Break,Was Determined. Caused by Incorrect Assumption Used in Analyses.Addl Supports Added to HPCI Room Corridor Wall (← links)
- 05000331/LER-1998-002, :on 980403,unexpected ESF Actuation Was Noted. Caused by Inadequate Procedure.Relay Was Replaced & STP Revised (← links)
- 05000331/LER-1986-019, :on 860922,250-volt Dc Battery Declared Inoperable.Caused by Degradation of Positive Plates Due to Galvanic Reaction Resulting from Impurities in Plate Weld Matls.Battery Tested & 16 Cells Replaced (← links)
- 05000331/LER-1986-023, :on 861104,control Room RCIC Pump Outlet Flow Meter Determined Not Indicating Actual RCIC Pump Flow Rate. Cause Undetermined But age-related Failure Suspected.Meter Replaced (← links)
- 05000331/LER-1986-021, :on 861020,RWCU Sys Isolated Due to High Temp Indication from Outlet of non-regenerative Hx.Caused by Deficiency in Administrative Controls.Trip Setpoint Reset & Securing Mechanism Will Be Added to Dial (← links)
- 05000331/LER-1986-020, :on 861015,charcoal Beds of Control Bldg Standby Filter Units Rendered Inoperable After Functional Test of Fire Protection Deluge Sys.Caused by Inadequate Procedure.Procedure Being Revised (← links)
- 05000331/LER-1986-018, :on 860802 & 03,RCIC Sys Declared Inoperable. Caused by Planned Maint on Valve MO-2517,involving Rewiring to Meet Environ Qualification Requirements (← links)
- 05000331/LER-1986-024, :on 861121,HPCI Sys Isolation Valve Closed Due to Signal from HPCI Steam Line High Flow Pressure Differential Indicating Switch PDIS2245.Caused by Moisture Shorting Out Terminals in Switch (← links)
- 05000331/LER-1997-011, :on 970919,TS Surveillance Testing of Power Operated Primary Ci Valves Was Missed Due to Improper Administration of TS Amend 181.Revised Procedure & Performed Closure Time Tests (← links)
- 05000331/LER-1997-010, :on 970814,alarms Received Indicating Isolation of Drywell Sumps & Shutdown Cooling.Caused by open-circuited Coil.Maint Personnel Replaced Failed Coil,Drywell Floor & Equipment Drain Sys Thereby Reestablished & LCO Exited (← links)
- 05000331/LER-1987-001, :on 870114,RWCU Sys Isolated on Signal from F Temp Differential Switch.Caused by Steam Leak in Root Isolation Valve.Corrective Maint Action Request Generated to Repack Root Valve & Investigate Leak (← links)
- 05000331/LER-1997-009, :on 970724,inadequate Surveillance Testing of RWC Area Differential Temperature Isolation Logic Was Discovered.Caused by Inattention to Detail.Stp 42A016-Q.A Revised to Incorporate Full CFT for Rcwu by 970903 (← links)
- 05000331/LER-1986-008, :on 860325,spurious Signal Received on Reactor Protection Sys Channel A,Causing Full Trip.Cause Unknown. Trip Immediately Reset (← links)
- 05000331/LER-1987-002, :on 870214,automatic Isolation of Control Bldg Ventilation Sys & Initiation of Standby Filter B Occurred. Caused by Incorrect Setting of Downscale Trip Point of Radiation Monitor.Trip Point Lowered (← links)
- 05000331/LER-1986-027, :on 861218,inadvertent Trip of Reactor Protection Sys Occurred.Caused by Personnel Failure to Reset Logic.Disciplinary Action Initiated.Procedure Will Be Modified to Include Addl Precautions (← links)
- 05000331/LER-1986-025, :on 861210,automatic Scram Received During Reactor Shutdown When B,C & D Intermediate Range Monitors Tripped Upscale.Caused by Noise Generation from Source Range Monitor Insertion & Personnel Error (← links)
- 05000331/LER-1986-026, :on 861212,standby Filter Unit Train B Autostarted on Control Bldg Radiation Monitor Downscale Trip.Caused by Personnel Error.Electricians Reminded of Need to Perform Work Carefully (← links)
- 05000331/LER-1999-003, :on 990209,both Trains of CR Standby Filter Units (Sfu) Were Declared Inoperable.Caused by Failure of Low Flow Pressure Differential Switch (Pds).Replaced PDS in B Sfu & Tested & Restored a Sfu.With (← links)
- 05000331/LER-1986-012, :on 860418,RWCU Sys Isolated Due to Erroneous Signal from Steam Leak Detection Instrumentation.Caused by Failure of Temp Differential Switch E.Performance of Riley Panalarm Switches to Be Trended (← links)
- 05000331/LER-1987-003, :on 870223,RWCU Sys Isolated on Signal from Room B Differential Temp Switch Located in RWCU Pump Room. Caused by Failure of Redundant Instrumentation. Instrumentation Replaced (← links)
- 05000331/LER-1987-004, :on 870223,RCIC Removed from Svc for Planned Sys Maint on Limitorque motor-operated Valves.Caused by Valves Being Installed W/Locknuts Not Staked.Locknuts Staked & RCIC Sys Returned to Svc (← links)
- 05000331/LER-1984-037, :on 840929,reactor Scrammed on hi-hi Intermediate Range Monitor Signals from Channel E & F. Cause May Be Attributed to Spurious Electrical Noise.Review of Design & Installation Performed (← links)
- 05000331/LER-1986-011, :on 860401,during Scheduled Maint Outage,Main Steam Line Isolation Valve Hung Up in Partially Open Position.Caused by Metallurgical Flaw in Stellite on Junk Ring.Galling Removed from Ring & Valve (← links)
- 05000331/LER-1986-009, :on 860329,w/reactor in Cold shutdown,one-half Group III Primary Containment Isolation & Standby Gas Treatment Sys Actuation Occurred During Outage Maint.Caused by Human Error (← links)
- 05000331/LER-1997-012, :on 971113,spurious PCIS Group VI Isolation Occurred Which Resulted in Automatic Closure of Outboard RCIC Steam Supply Isolation Valve.Caused Undeterminate.Temp Switch Was Replaced & Isolation Cleared (← links)
- 05000331/LER-1986-006, :on 860313,automatic Isolation Occurred While Operators Placed RWCU Sys Filter Demineralizer B Into Svc Following Resin Precoat Process.Caused by Gross Leakage in Area of Filter Demineralizer Tank Main Gasket (← links)
- 05000331/LER-1986-005, :on 860311,RCIC Sys Turbine/Pump Initiation & Control Power Static Inverter Stopped Providing Output Power.Caused by Inadequate Maint Instruction to Adequately Test Inverter Prior to Installation (← links)
- 05000331/LER-1986-017, :on 860613,at Approx 5% Power,Manual Scram Initiated When Reactor Water Level Approached Low Level Scram Setpoint.Caused by Faulty Position Controllers. Positioners Replaced & Cleaned (← links)
- 05000331/LER-1998-001, :on 980109,CR Staff Below TSs Minimum Requirements Occurred Due to Family Medical Emergency. Immediate Action Was Taken by Calling in day-shift Sta (← links)
- 05000331/LER-1986-015, :on 860503,fire Suppression Sys Isolation Occurred.Caused by Simultaneous Closures of Manual post- Indicating Valves Due to Inadequate Administrative Procedures.Procedures Revised (← links)
- 05000331/LER-1986-016, :on 860507,RWCU Sys Isolated Due to High Temp Indication from Nonregenerative Hx.Caused by Misleading Electrical Schematic.Schematic Will Be Revised (← links)
- 05000331/LER-1985-042, :on 851005,two Drywell Equipment Drain Sump Timers Found Inoperable.Caused by Corrosion/Pitting on Internal Motor Power Contacts & Increased Resistance Across Contacts at Low Voltage.Timers Replaced (← links)
- 05000331/LER-1997-013, :on 971119,noted That Inoperable Primary Containment Isolation Valves Exceeded TS Lco.Caused by Misinterpretation of Two TS Definitions.Revised Appropriate Plant Procedures to Provide Correct Guidance (← links)
- 05000331/LER-1986-010, :on 860408,HPCI Sys Failed to Meet Discharge Pressure & Flow Requirements.Caused by Woodward EG-M Control Box Needing Recalibr.Box Recalibr & Hydraulic Control Tappet Valve Body Repaired (← links)
- 05000331/LER-1999-004, :on 990222,entry Into TS 3.0.3 Caused by Both Trains of Standby Gas Treatment Inoperable,Was Discovered. Caused by Surveillance Test Coincident with Component failure.FIC5828A Compacitor Replaced.With (← links)
- 05000331/LER-1986-013, :on 860419,RCIC Isolated Following Signal from RCIC Steam Leak Detection Sys.Caused by Design Problem within Temp Differential Switch,Riley Panalarm Model 86. Short Time Delays Installed (← links)
- 05000331/LER-1986-007, :on 860315,RCIC Sys Isolated Following Signal from Steam Leak Detection Sys.Caused by Design Problem in Internal Switch Circuitry of Temp Differential Switch. Circuitry Mod Will Be Implemented (← links)
- 05000331/LER-1998-008, :on 980916, a Cb Chiller Was Declared Inoperable.Caused by Potential Loss of Control Air Supply. Mod Was Performed to Change Air Supply from Common Supply to SR a H&V IA Compressor Sys.With (← links)
- 05000331/LER-1986-001, :on 860122,auto-isolation of Control Bldg Ventilation Sys & Initiation of Standby Filter Unit a Occurred.Caused by Low Inlet Air Temp & Personnel Error. Supervisor Counseled & Standby Filter Reset (← links)
- 05000331/LER-1986-003, :on 850809,maint Performed on Transverse in-core Probe (TIP) Ball Valve C Which Could Have Resulted in Loss of Primary Containment Integrity.Caused by Incorrect Updated FSAR Analysis (← links)
- 05000331/LER-1986-002, :on 860114,containment Atmosphere Dilution Hydrogen & Oxygen Analyzer Inoperable.Caused by Failed Bearing.Analyzer Motor & Pump Assembly Replaced & Returned to Svc (← links)
- 05000331/LER-1997-007, :on 970624,inadequate Test of Reactor Mode Switch to Shutdown Position Rod Block Function & RBM Was Performed.Caused by Procedural Inadequacy.Stp 42C002-Q Has Been Revised & Was re-performed Satisfactorily (← links)
- 05000331/LER-1997-006, :on 970530,functional Test of Hpcis Steam Leak Detection Td Was Inadequate.Caused Because Functional Test Procedure Contained Incorrect Instruction.Revised Procedure & re-performed Functional Test (← links)
- 05000331/LER-1978-030-01, /01T-0 on 780617:water Leak Found in Area of B Recirculation Sys N2A Inlet Nozzle Caused by Wall Crack in Nozzle Safe End.Lab Analysis Will Be Performed to Determine Cause of Cracking (← links)
- 05000331/LER-1986-004, :on 860212,RWCU Sys Isolated Due to High Differential Temp Indication.Caused by Minor Degradation of Manual Valves on Vent & Drain Lines of Regenerative HX A. Valves Tightened (← links)
- 05000331/LER-1996-007, :on 961203,three MSRVs & One MSSV Failed to Meet TS Setpoints.Caused by Insufficient Tolerance Associated W/Relief Valve Setpoint Acceptance Criteria.Out of Tolerance MSRVs & MSSV Were Restored to within TS LSSS (← links)
- 05000331/LER-1996-007-01, Forwards LER 96-007-01,IAW 10CFR50.73.Listed Item Represents New Commitment Made in Ltr (← links)
- 05000331/LER-1985-041, :on 851007 & 28,maint Activities on Isolation & Downstream Valves Required Voluntary Realignment of Fire Suppression Sys from Normal to Backup Water Supply.Sys Returned to Normal Status (← links)
- 05000331/LER-1985-040, :on 851010,unintentional Momentary Violation of Secondary Containment Occurred When Both Airlock Doors Simultaneously Opened.Caused by Loose Wire on Solenoid.Wire Repaired.Amend to Tech Specs Requested (← links)
- 05000331/LER-1985-045, :on 851116 & 22,momentary Inadvertent Violations of Secondary Containment Occurred.Caused by Defective Door Interlock Mechanisms.New Mechanisms Installed (← links)
- 05000331/LER-1997-001, :on 970115,failure to Comply with TS for Main Steam Line Radiation Monitors Occurred.Caused by Less than Adequate Implementation of post-outage NMCA Test.Mslrm Were Set in Accordance with TS (← links)
- 05000331/LER-1985-028, :on 850720,RCIC Sys Tripped on Overspeed While auto-starting During Monthly/Quarterly Testing.Caused by Faulty Flow Controller & Ramp Generator Operation (← links)
- 05000331/LER-1985-043, :on 851104,HPCI Sys Taken Inoperable to Work on Packing Leak on Outboard Steam Supply Isolation Valve.Valve Repaired & Sys Declared Operable.Further Valve Repair Will Be Performed in Near Future (← links)
- 05000331/LER-1985-044, :on 851105,RCIC Taken Out of Svc to Modify RCIC-to-vessel Inject Valve Circuitry.Repair Completed.On 851107,RCIC Tripped on Electrical Overspeed.Caused by Setpoint Drift on Overspeed Trip Monitor (← links)
- 05000331/LER-1985-036, :on 850828,emergency Diesel Generators Declared Inoperable Per Tech Spec 3.5.G.1.Caused by Determination That Existing Electrical Lineup Could Defeat Load Sequencing Logic of Emergency Diesel Generators (← links)
- 05000331/LER-1985-038, :on 850906,both Doors of Airlock Between Reactor & Turbine Bldgs Inadvertently Opened Simultaneously, Resulting in Secondary Containment Violations.Caused by Personnel Error.Door Interlocks Repaired (← links)
- 05000331/LER-1997-004, :on 970223,three of Four MSL Low RP Isolation Instrumentation Not in Agreement W/Preferred Direction of Numerical Values in Ts.Revised Engineering Setpoint Calculation & Plant Calibr Procedures (← links)
- 05000331/LER-1997-005, :on 970224,setpoint for Recirculation Flow Upscale Rod Block Greater than TS Allowable Limits.Caused by Inadequate Implementation of TS Amend 193.STP 42C006-SA Was Revised (← links)
- 05000331/LER-1997-003, :on 970220,reactivity Anomalies Surveillance Requirement Were Not Met Due to Inadequate Technical Review of Procedure Change.Potential for TS Change Being Evaluated (← links)
- 05000331/LER-1997-002, :on 970207,both Standby Gas Treatment Trains Were Inoperable Due to Low Carbon Bed Efficiencies.Approx 80 Pounds of Carbon Was Added to Each Train of SBGT Sys & Each Train Was Retested W/Satisfactory Results (← links)
- 05000331/LER-1996-001, :on 960325,determined That Degradation in Scram Insertion Times Occurred.Caused by Adhesion Between Viton SSPV Exhaust Valve Diaphragm & SSPV Seat.Replaced Viton SSPV Diaphragms W/Buna-N (← links)
- 05000331/LER-1985-046, :on 851120,electric Fire Pump Out of Svc for More than 7 Days & Maint Not Completed.Caused by Increased Scope of Work & Delay in Procurement of Parts.Electric Pump Returned to Svc & Pump Tested (← links)
- 05000331/LER-1985-029, :on 850812,during Diesel Fire Pump Operability Test,Leak Detected in Fire Main Outside Reactor Bldg.Caused by Air Hammer.Portion of Fire Main Isolated to Initiate Repairs (← links)
- 05000331/LER-1985-033, :on 850805,emergency Diesel Generator a Removed from Svc for Air Blower Insp.Emergency Diesel Generator B Declared Inoperable Due to High Fuel Oil Sediment Levels. Emergency Diesel Generators Returned to Svc (← links)
- 05000331/LER-1996-006, :on 961026,non-conservative APRM 15% Scram Setpoint Occurred Due to Inadequate Procedures.Oss Immediately Halted Core Alterations & Verified That All CR Were Fully Inserted (← links)
- 05000331/LER-1985-032, :on 850802,plant Operated for Period in Excess of 7 H W/O Performing Required Surveillance in Neutron Noise Region.Caused by Operator Error.Personnel Counseled (← links)
- 05000331/LER-1985-037, :on 850731,too Few APRM Downscale Trip Channels Discovered.Util & GE Currently Determining Purpose of Reactor Protection Sys Logic Channel Trip & Feasibility of Elimination (← links)
- 05000331/LER-1985-031, :on 850802,RCIC Sys Turbine/Pump Initiation & Control Power Static Inverter Removed from Svc,Rendering RCIC Sys Inoperable.Caused by Failure of Inverter Unit. Inverter Replaced (← links)
- 05000331/LER-1996-005, :on 961020,PCIS Groups 3 & 5 Isolations Occurred Due to Temporary Power Connections to Istrument Ac. Temporary Power Cart That Was Also Connected to 1BR8601 Was Removed (← links)
- 05000331/LER-1985-030, :on 850731,two Secondary Containment Airlock Doors Simultaneously Opened.Caused by out-of-adjustment Door Interlock Mechanism.Defective Mechanism Repaired (← links)
- 05000331/LER-1985-024, :on 850707,two Reactor Protection Sys Trips Occurred.Caused by Unattached Trip Coil Inside Damping Spring on Feeder Breaker 1B42.Breaker Manufacturer Will Be Notified (← links)
- 05000331/LER-1985-027, :on 850721,fire Watch on HPCI Deluge Sys Discovered Prematurely Canceled 3 Days Earlier.Caused by Ineffective Personnel Communications.Need to Communicate Between Shifts Reemphasized (← links)
- 05000331/LER-1985-034, :on 850709,reactor Protection Sys a Tripped During Reenergization of Sys B.Caused by Operational Amplifiers Saturating When First Energized.Amplifiers Replaced (← links)
- 05000331/LER-1985-039, :on 850918,RCIC-to-vessel Inject Valve BN-20-2512 Failed to Open on Demand.Possibly Caused by Unnecessarily High Setting of Valve Torque Switch.Switch Placed at Lower Setting (← links)
- 05000331/LER-1985-026, :on 850522,personnel Identified Two Shock Suppressors (Snubbers) in Installed Configuration That Could Result in Overstressing of Snubber During Dbe.Insp of Snubbers Performed (← links)
- 05000331/LER-1985-025, :on 850708,inadvertent Steam Line High Radiation Protection Sys Trip Occurred During Surveillance Test.Caused by Procedural Deficiency.Trip Reset & Procedure Permanently Corrected (← links)
- 05000331/LER-1985-035, :on 850904,RCIC Sys Declared Inoperable When RCIC Turbine Tripped During Manual Start.Caused by Worn Mechanical Overspeed Trip Linkage Sys.New Turbine Governor Control Box Ordered (← links)
- 05000331/LER-1985-023, :on 850702,reactor Water Cleanup Sys Isolated as Result of Momentary Spurious Signal in Leak Detection Instrumentation.Again on 850713 & 15,sys Isolated Due to Procedural Deficiency.Procedural Rev Initiated (← links)
- 05000331/LER-1996-005-01, :on 961020,PCIS Groups 3 & 5 Isolations Occurred Due to Temporary Power Connections to Instrument Ac.Temporary Power Cart Was Removed from Breaker That Was Also Supplying Power to 1Y2A (← links)
- 05000331/LER-1985-017, :on 850411,during Testing at Wyle Labs,Four Main Steam Safety/Relief Valves Lifted Below Min Allowable Pressure.Caused by Leakage Due to Minor Steam Cutting of Valve Seating Surfaces.Valves Rebuilt (← links)
- 05000331/LER-1996-004, :on 961008,HPCI Sys Isolation Occurred Due to Misplaced Relay Block During Testing.Hga & Hfa Relays Were Labeled to Indicate Contact Locations (← links)
- 05000331/LER-1985-019, :on 850607,control Rods Adjacent to Cell in Which Maint Being Performed Not Electrically Disarmed.Caused by Operator Error.Administrative Duties Lessened & Procedural Mods Instituted (← links)
- 05000331/LER-1985-012, :on 850425,w/reactor Shut Down & Defueled,Group III Isolation & Both Standby Gas Treatment Sys auto- Initated on Downscale Reactor Bldg Vent Radiation Monitor Trips.Caused by Procedural Error (← links)
- 05000331/LER-1985-010, :on 850310,piping Ultrasonic Insps Revealed Several Welds in Recirculation Piping W/Circumferential &/Or Axial Indications.Cause Not Stated.Welds Being Repaired W/ Overlays (← links)
- 05000331/LER-1985-021, :on 850614,discovered That Spent Fuel Pool 5 Inches Below Tech Spec Level of 36 Ft.Caused by Small leak-through of Cask Pool Drain Valve.Maint Action Requests Initiated to Repair Valves (← links)
- 05000331/LER-1985-022, :on 850617 & 20,actuations of Standby Gas Treatment Sys & Half of Group III Primary Containment Isolation Sys Valves Occurred.Caused by Plant Mod & Procedural Deficiency.Procedure Revised (← links)
- 05000331/LER-1985-018, :on 850606,reactor Protection Sys Trip Occurred.Caused by Spurious Signal from LPRM Due to Noise Spike During Testing & Reinstallation.Reactor Protection Sys Reset & APRM Channel B Bypassed (← links)
- 05000331/LER-1985-020, :on 850610,inadvertent Reactor Protection Sys Actuation Occurred.Caused by Manual Trip of Supply Feed Breaker,Momentary Upscale Average Power Range Monitor Signal & Scram Discharge Vol Level Signal (← links)
- 05000331/LER-1985-016, :on 850601,unintentional Momentary Violation of Secondary Containment Occurred & Two Secondary Containment Airlock Doors Simultaneously Opened.Caused by out-of-adjustment Door Interlock Mechanism (← links)
- 05000331/LER-1985-015, :on 850529,w/reactor Shut Down & Electric & Diesel Fire Pumps Removed from Svc,Well Water Pump Aligned for Fire Suppression.On 850531,nearby Fire Main Ruptured. Damaged Piping Isolated & Repaired (← links)
- 05000331/LER-1992-020, :on 921229,cable Spreading Room Carbon Dioxide Fire Suppression Sys Exceeded Allowable Fourteen Day Period for Inoperability Due to Scope of Activitiy Being Performed. Continuous Fire Watch Established (← links)
- 05000331/LER-1992-017, :on 921026,discovered That Two Hourly Fire Watches in RHR Valve Room Missed During QA Surveillance. Caused by Contract Security Personnel Error.Personnel Instructed Re Use of Fire Watch Checklist (← links)
- 05000331/LER-1985-007, :on 850221,during Disassembly of HPCI Turbine for Overhaul & Insp,Damage & Missing Parts Noted in Several of 10 Steam Reversing Chambers.Caused by Pressure Pulsing & Thermal Fatigue (← links)
- 05000331/LER-1992-012, :on 920710,vent Damper Assembly Determined to Be Nonseismic When Vent Damper Assembly Failed Open.Caused by Lack of Seismic Qualification of Cable Spreading Room Vent & Damper.Vent & Damper Will Be Replaced (← links)
- 05000331/LER-1985-014, :on 850506,standby Gas Treatment Sys Actuated. Caused by Jumper Cable Disconnecting Due to Opening Door Panel.Jumper Reinstalled W/More Secure Mechanism.Isolation & Ventilation Sys Reset (← links)
- 05000331/LER-1985-013, :on 850501,reactor Water Cleanup Sys Isolated on High Differential Flow Condition.Caused by Maint Personnel Bumping Speed Controller.Sys Returned to Normal Svc (← links)
- 05000331/LER-1992-018, :on 921113,turbine Trip & Reactor Scram Occurred Due to Loss of Condenser Vacuum.Caused by Failure of Circulating Water Pump a Which Cut Off Flow to Condenser.Vibration Sensors Placed on Pump (← links)
- 05000331/LER-1992-019, :on 921119,control Bldg a Chiller Trippped & Could Not Be Promptly Restarted,Resulting in Loss of Control Bldg Air Conditioning.Caused by Low Oil Level & Pressure. Five Gallons of Oil Added to Chiller (← links)
- 05000331/LER-1992-013, :on 920817,automatic Reactor Scram Initiated Due to Perceived High Average power-range Neutron Flux Level.Caused by Noise Signal Which Affected Recirculation Flow Signals.Circuit Inductors Installed (← links)
- 05000331/LER-1996-002-01, :on 960408,PCIS Half Group III Isolation Occurred Due to Blown Fuse During Maint.Fuse Was Replaced & Radiation Monitor Was Tested (← links)
- 05000331/LER-1992-016, :on 921022,control Bldg Chiller B Tripped & Could Not Be Promptly Restarted,Resulting in Loss of Control Bldg Air Conditioning.Caused by Air Bubble in Chilled Water Piping.Air Purged & Circuitry Verified Intact (← links)
- 05000331/LER-1996-003, :on 960716,PCIS Groups 1-5 Isolations Occurred. Caused by Electrical Protection Assembly Breaker Trip Undervoltage.Placed Bus on Alternate Power Supply & Reset Isolations & Half Scram (← links)
- 05000331/LER-1985-011, :on 850321,full Reactor Protection Sys Trip Signal & Isolation Signal Received While Reactor Shut Down & Defueled.Caused by Radiography Source Used During NDT of MSIV C (← links)
- 05000331/LER-1985-009, :on 850315,reactor Protection Sys Actuated Due to Intermediate Range Monitor High Flux Upscale Trips.Caused by Induction Heat Stress Improvement Work Performed on Recirculation Piping.Trips Reset (← links)
- 05000331/LER-1985-008, :on 850311,eight Circuit Breakers on Instrument Ac Distribution Panel B Tripped.Caused by Falling Panel Cover Being Replaced Following Maint.Tripped Breakers Reset & Affected Sys Checked (← links)
- 05000331/LER-1992-015, :on 920910,LPCI Swing Bus Inadvertently Deenergized for Approx Two Minutes.Caused by Breaker Transfer Problem During Restortion of LPCI Swing Bus. Appropriate Procedures Revised (← links)
- 05000331/LER-1984-045, :on 841219,two Secondary Containment Airlock Doors Opened Simultaneously.Caused by Ineffective Door Latching Mechanism (← links)
- 05000331/LER-1992-007, :on 920507,fire Barrier Penetration Found Unsealed During Maint on Instrument Air Pipe.Caused by Insufficient Procedural Controls During Original Const.Fire Watch Initiated for Affected Fire Zones (← links)
- 05000331/LER-1992-009, :on 920301,during Local Leak Rate Testing,Three of Eight MSIVs Failed to Meet Established Acceptance Criteria.Caused by Improper Positioning of Disk Piston.Msivs Remachined to within Design Specs (← links)
- 05000331/LER-1984-044, :on 841207,fire Hose Inoperable.Caused by Maint Activities.Special Wye Fitting Placed on Hose Station 22 to Route Water to Fire Hose (← links)
- 05000331/LER-1984-043, :on 841206 & 850102,control Room Intake Standby Filter Unit Initiated.Caused by Low Inlet Air Temp Setpoint. Preheat Coils Repaired (← links)
- 05000331/LER-1985-005, :on 850206,four MSIVs Failed to Meet Leakage Criteria of 11.5 Std Cubic Ft/H.Probably Caused by Seat & Disc Wear.Valves Being Repaired (← links)
- 05000331/LER-1985-004, :on 850202,reactor Protection Sys Trip Occurred Due to APRM Upscale Trip.Caused by Shorted LPRM W/Common Inputs to APRM Channels a & B.Investigation to Determine Failure Mod Begun (← links)
- 05000331/LER-1996-002, :on 960408,PCIS Half Group III Isolation Occurred Due to Blown Fuse During Maint.Reviewed Event W/ Maint Technicians to Reinforce Need to Secure Loose Cables During Maint Activities (← links)
- 05000331/LER-1985-002, :on 850128,HPCI Declared Inoperable Due to Failure of Turbine Stop Valve to Open During Monthly Surveillance Test.Caused by Pilot Oil Trip Solenoid Valve Being Stuck in Open Position.Valve Replaced (← links)
- 05000331/LER-1985-003, :on 850125,doors of Airlock Between Reactor & Turbine Bldgs Inadvertently Opened Simultaneously.On 850130, Doors of Railroad Airlock Opened Simultaneously.Caused by Bad Solenoid in Interlock Mechanism (← links)
- 05000331/LER-1985-001, :on 850123,reactor Water Cleanup Sys Isolated Twice as Result of Momentary Spurious Signals from Reactor Water Cleanup Leak Detection Instrumentation.Cause Not Stated.Sys Will Be Tested in Refuel Outage (← links)
- 05000331/LER-1984-035, :on 840921 & 26,four Violations Occurred Involving Two Secondary Containment Air Lock Doors Simultaneously Opening.Caused by Defective Door Interlock & Latching Mechanisms.Mechanisms Repaired (← links)
- 05000331/LER-1992-014, :on 920831,RWCU Isolation Occurred During Electrical Protection Assembly (EPA) Surveillance Test. Caused by Trip Relay Dropping Out Momentarily During RPS Bus Transfer.Epa Surveillance Test Revised (← links)
- 05000331/LER-1992-010, :on 920617,RW Pump Circuit Failure Caused Fire to Break Out in 1B20 Load Center.Caused by Inadequate Review of Breaker Disconnect Compatability W/Load Ctr Cubicle Stabs in Design.Procedural Revisions Re Design Made (← links)
- 05000331/LER-1984-042, :on 841123,reactor Scram Occurred as Result of Loss of Nonvital Buses.Caused by Transformer Trip from Spurious Fire Protection Deluge Sys Activation.Deluge Sys Modified (← links)
- 05000331/LER-1995-013, :on 951221,HPCI Inoperable.Caused by Water in Turbine Steam Line.C/A:Detailed Analysis of HPCI Operability Performed,Will Be Completed by 960501 (← links)
- 05000331/LER-1984-041, :on 841111,reactor Water Conductivity Increased Above Tech Spec Limit.Caused by Resin or Air Intrusion. Operating Procedures Improved to Minimize Sys Disturbances (← links)
- 05000331/LER-1992-008, :on 920402,discovered That Two Bolts Broke When Subjected to Less than Required Torque Requirements.Caused by Hydrogen Induced Cracking.Bolts Replaced & Sent Offsite for Testing to Determine Cause (← links)
- 05000331/LER-1984-040, :on 841104,auxiliary Transformer Failed,Causing Main Generator & Auxiliary Transformer Breakers to Nonessential Buses to Open.Caused by Short Circuit Between Turns in High Voltage Winding of Phase Coil (← links)
- 05000331/LER-1985-006, :on 850303,while Resetting Isolations & Alarms Resulting from Instrument Panel a Being Deenergized,Standby Diesel Generator a Which Had Not Been Locked Began to auto-start.Generator Secured (← links)
- 05000331/LER-1984-039, :on 841101,during Normal Operation,Reactor Water Cleanup Sys Isolated Due to Momentary Spurious Signal in Reactor Water Cleanup Isolation Logic.Cause Unknown.Sys Free of Valid Isolation Parameters (← links)
- 05000331/LER-1984-038, :Between 841029-1115,two Secondary Containment Airlock Doors Simultaneously Opened Three Times.Caused by Defective Door Latch Mechanisms or Interlock Solenoids. Devices Repaired (← links)
- 05000331/LER-1984-028, :on 840714,degraded Voltage Condition on Offsite Power Grid Resulted in Automatic Switching of Buses to Onsite Power Initiating Scram.Caused by Spurious Isolation Upon Reenergizing from Temp Switches (← links)
- 05000331/LER-1992-011, :on 920707,A & B EDGs Automatically Started But Were Not Required to Load.Caused by Sensed Momentary under-voltage Condition Resulting from Electrical Storm.Edgs Secured & Returned to Standby Mode (← links)
- 05000331/LER-1984-030, :on 840821,during Normal Operation,Momentary Violation of Second Containment Occurred When Two Secondary Containment Airlock Doors Opened Simultaneously.Caused by Personnel Error (← links)
- 05000331/LER-1984-034, :Between 840821 & 0920,four Unintentional Momentary Violations Occurred When Two Secondary Containment Airlock Doors Simultaneously Opened.Caused by Defective Door Interlock & Latching Mechanisms (← links)
- 05000331/LER-1995-009, :on 950829,PCIS Groups 2 Through 5 Isolations Occurred Due to EPA Breaker Trip on Undervoltage. Placed Bus on Alternate Power Supply (← links)
- 05000331/LER-1984-025, :on 840808,electrical Supply Breaker for RCIC Steam Supply Valve Tripped Each Time Valve Cycled Closed. Caused by Torque Switch Out of Adjustment.Torque Switch Readjusted (← links)
- 05000331/LER-1992-006, :on 920416,161 Kv Breaker Resulted in Several Unanticipated Primary Containment Isolation Sys Actuations & Starting of B Edg.Caused by Momentary Drop in Voltage on One Bus.Switchyard Cable Was Replaced (← links)
- 05000331/LER-1995-012, :on 951212,HPCIS Turbine Manually Tripped Following Receipt of Low Flow Alarm During Testing.Installed Temporary Instrumentation on HPCI Turbine Control Sys (← links)
- 05000331/LER-1992-005, :on 920408,primary Containment Isolation Sys Group III Isolation Occurred,Resulting in Initiation of Standby Gas Treatment Sys A.Cause Unknown.Isolation Reset (← links)
- 05000331/LER-1990-010, :on 900519,air Gap Between Steel Drywell Shell & Outer Concrete Radiological Shield Observed to Have Small Pinhole Leak.Cause Undetermined.Southwest CRD Lines Replaced Using New Drywell Penetration Design (← links)
- 05000331/LER-1992-004, :on 920322,intrusion of Carbon Dioxide Into Control Room Occurred Which Led to Unacceptable Reduction in Area Oxygen Levels.Caused by Overpressurization of Cable Spreading Room.Addl Vent Path Provided (← links)
- 05000331/LER-1984-029-01, :on 840718,standby Liquid Control Sys (Sblc) Isolated for 5 H After Improper Manipulation of Common Suction Valve from Sblc Tank to Sblc Pumps.Caused by Personnel Error.Procedures & Training Revised (← links)
- 05000331/LER-1995-011, :on 951019,during Surveillance Test Procedure, a Sdg Outboard Bearing Temp Reached 205 F.Caused by Incorrectly Installed Room Temp Controller.Controller Reconfigured (← links)
- 05000331/LER-1984-027, :on 840712,spurious Reactor Scram Occurred Due to Jarring of Instrument Rack in Reactor Bldg.Caused by Const of Scaffolding Adjacent to Instrument Rack 1C-56. Multicolored Demarcation Painted on Floor (← links)
- 05000331/LER-1984-029, :on 840712,w/standby Filter Unit B Inoperable Due to Inoperable Radiation Monitor,Filter Unit a Failed to Function During Testing.Caused by Malfunction of Air Pilot Positioner.Monitors Will Be Replaced (← links)
- 05000331/LER-1995-006, :on 950625,PCIS Group III Isolation Occurred Along W/Initiation of Standby Gas Treatment Sys B (← links)
- 05000331/LER-1984-024, :on 840630,w/reactor Critical & Plant in Startup Mode,Isolation Valve on Inlet Line to Reactor Water Cleanup Sys Automatically Closed.Caused by Noise in Reactor Water Cleanup Sys (← links)
- 05000331/LER-1984-036, :on 840925,30 & 1020,reactor Water Cleanup Sys Isolated as Result of Momentary Spurious Signals in Leak Detection Logic.Cause Unknown.Sys Verified to Be Free of Actual Leakage (← links)
- 05000331/LER-1984-031, :on 840903,barometric Condenser High Pressure Alarm in RCIC Sys Occurred.Caused by Inoperable Condenser Vacuum Pump.Rcic Declared Inoperable & 7-day Limiting Condition Initiated (← links)
- 05000331/LER-1984-020, :on 840617,20 & 0710,spurious Initiation Signals from Control Bldg Air Intake Radiation Monitor a Automatically Started Standby Filter Unit A.Caused by High Moisture or Thunderstorms (← links)
- 05000331/LER-1984-032, :on 840904,control Room Ventilation Sys B Started Automatically When Control Bldg Air Intake Radiation Monitor B Tripped.Caused by Spurious Initiations.Radiation Element Photomultiplier Tube Replaced (← links)
- 05000331/LER-1984-033, :on 840906,electric Fire Pump Failed to Meet Flow Requirements & Plant Exceeded 7-day Limit for Pump Inoperability.Pump Impeller Adjusted to Increase Flow to Meet Requirement (← links)
- 05000331/LER-1984-021, :on 840617,during Surveillance Test for Standby Diesel Generator B Operability,Diesel Tripped on High Crankcase Pressure While Loaded to Approx 2,400 Kw.Caused by Scavenging Air Blower Failure.Blower Repaired (← links)
- 05000331/LER-1984-019, :on 840521,0603,05 & 06,unplanned Partial Group V Isolation Experienced.Caused by Random Noise in Circuit.Further Study to Reduce Susceptibility of Sys to Spurious Isolation Pursued (← links)
- 05000331/LER-1992-001, :on 920115,determined That Triple Low Level Trip Function May Not Be Functional at High Drywell Temps.On 910129,determined That HPCI & RCIC Trips May Not Function at High Drywell Temps.Level Instruments Calibr (← links)
- 05000331/LER-1995-008, :on 950726,determined That Potential Loss of Both Trains of Standby Gas Treatment Existed Due to Leaking Valves.Plan Will Be Developed to Isolate Leaks Into TB Equipment Drain Sump & Repair Leaking Valves (← links)
- 05000331/LER-1984-018, :on 840507,RCIC Steam Leak High Differential Pressure Relay Inadvertently Jarred & Energized,Causing Spurious RCIC Isolation & Turbine Trip Signals.Cause Unknown.Signal Reset & Isolation Valve Opened (← links)
- 05000331/LER-1995-007, :on 950725,technician Inadvertently Caused PCIS & RCIC Turbine Trip While Installing Relay Block.Event & Causes Reviewed W/Involved Technicians (← links)
- 05000331/LER-1984-015, :on 840430,reactor Scram Experienced Due to Upscale Trip of Intermediate Range Monitors (Irm).Caused by Operator Failing to Select Higher IRM.Post-scram Review Confirmed All Sys Functioned Per Design (← links)
- 05000331/LER-1984-017, :on 840504,HPCI Turbine Inadvertently Initiated During Routine Surveillance Test of Reactor low-low Water Level Instrumentation.Turbine Manually Tripped Prior to Injection.Caused by Personnel Error (← links)
- 05000331/LER-1991-010, :on 910917,discovered That Four Foxboro Instrument Nests,Located in Control Room,Did Not Match Seismic Test Configuration.Caused by Missing Bumpers & Guide Rails.Guide Rails & Bumpers Installed (← links)
- 05000331/LER-1992-003, :on 920211,fire Barrier Cable Penetration Found Unsealed During Seal Insp Surveillance Test.Caused by Performing Design Mods in 1977 & 1980.Fire Watch Initiated & Fire Protection Improvements Made (← links)
- 05000331/LER-1984-023, :on 840619,w/plant at 75% Power,Surveillance Test Revealed Three of Four Reactor High Pressure Switches Out of Tolerance in Nonconservative Direction.Switches Recalibr,Returned to Svc & Retested (← links)
- 05000331/LER-1984-022, :on 840619,spurious Isolation Signal Caused Primary Containment Group III Isolation & Standby Gas Treatment Sys Actuation.Initiation Setpoint Not Reached.Sys Restored to Normal Operation (← links)
- 05000331/LER-1983-020-03, /03L-0:on 830525,undervoltage Relay for Instrument Bus 27-1Y21 Failed to Trip within Required Time Limits During Surveillance Testing.Caused by Target Flag Misalignment Preventing Contact Operation (← links)
- 05000331/LER-1983-018-03, /03L-0:on 830523,during Routine Surveillance Testing,Hpci Pump Failed to Meet Requirements for Output Pressure.Caused by Speed Indication Circuit for Turbine Out of Calibr.Speed Circuit Recalibr (← links)
- 05000331/LER-1992-002, :on 920126,fire Watch Not Posted at Open Door in Sump Room of Turbine Bldg.Caused by Inadequate Procedural Instructions.Fire Watch Posted 920127.Relabeling of Fire Doors to Highlight Need for Watch Underway (← links)
- 05000331/LER-1984-012, :on 840229,during HPCI Surveillance Testing, HPCI Turbine Stop Valve Failed to Open After Auxiliary Oil Pump Started.Hpci Declared Inoperable.Caused by Faulty Automatic Depressurization Sys Reset Switch (← links)
- 05000331/LER-1991-012, :on 911207,primary Containment Isolation Sys Isolation Occurred.Caused by Deformed Contacts on Connector. Contacts Returned to Normal Shape (← links)
- 05000331/LER-1991-013, :on 911107,backdraft Dampers Not Installed. Caused by Error by Contractor During Const.Written Instructions Provided to Operations Personnel (← links)
- 05000331/LER-1983-045-03, /03L-0:on 831205,sys a 24-volt Dc Trouble Alarm received.Hi-hi Alarms from Process Rad Monitors a & Automatic Initiation of Standby Gas Treatment Sys a Also Received.Caused by Loose Card in Charger (← links)
- 05000331/LER-1991-011, :on 911017,discovered That Six Valves in Flow Path to safety-related Hose Stations Not Verified Open. Caused by Incomplete Test Procedure.Valve Positions Verified & Surveillance Test Procedure Revised (← links)
- 05000331/LER-1983-040-03, /03L-0:on 830913,during Surveillance Testing, Drywell Equipment Drain Line Valve CV-3729 Did Not Close on Manual Closure Signal.Caused by Air Operator Piston Being Stuck.Valve Lubricated & Cycled (← links)
- 05000331/LER-1995-005, :on 950514,reactor Scram Occurred Due to FW Pump Trip.Caused by Lube Oil Pump Coupling Failure.Failed Coupling & Plugged Orifice Replaced & Coupling & Orifice for FW Pump a Inspected (← links)
- 05000331/LER-1983-019-03, /03L-0:on 830524,breaker Supplying Reactor Water Cleanup Isolation Valve Mo 2701 Position & Motive Power Found Open W/Valve in Open Position.Probably Caused by Personnel Inadvertently Bumping Breaker (← links)
- 05000331/LER-1984-014, :on 840416,inboard Reactor Water Cleanup Inlet Valve Isolated When Group III Planned Isolation & Partial Group V Unplanned Isolation Occurred.Caused by Electrical Noise on Leak Temp Differential Switch (← links)
- 05000331/LER-1984-013, :on 840413,increase of Unidentified Leakage Into Drywell Observed.Shutdown of Reactor Commenced.Caused by Packing Leak in Recirculation Pump a Discharge Bypass Valve.Valves Repacked & Adjusted (← links)
- 05000331/LER-1995-003, :on 950417,reactor Shutdown Completed Due to Shutdown Margin Calculation Error.Vendor Reviewing Processes to Determine Cause of Misprediction of Designed Shutdown Margin (← links)
- 05000331/LER-1983-043-03, /03L-0:on 831128,while Performing Daily Instrument Test,Torus B Level Transmitter Functioned Erratically.Caused by Corrosion & Dirt Building on Internal Amphenol Connector. Transmitter Cleaned & Recalibr (← links)
- 05000331/LER-1983-044-03, /03L-0:on 831128,during Normal Operation, Surveillance Test of Containment Atmosphere Dilution Sys Revealed Pressure Regulator PCV-4323A & B Malfunctions. Caused by Worn O-rings & Seats (← links)
- 05000331/LER-1983-046-03, /03L-0:on 831201,reactor Protection Sys Electric Assembly B2 Failed to Trip Output Breaker at Required Frequency.Caused by Setpoint Drift.Test Results Will Be Monitored (← links)
- 05000331/LER-1983-042-03, /03L-0:on 831108,recirculating Pump Motor Generator Sets Inadvertently Tripped.Manual Reactor Scram Initiated.Caused by Unreset Test Relay After Replacement of Blown Fuses in LPCI Loop Control Wiring (← links)
- 05000331/LER-1991-009, :on 910815,reactor Water Cleanup Sys Isolation Occurred.Caused by Blown Fuse in Power Supply Unit Resulting in Square Root Converter to Lose Power.Clip Repositioned & Fuse Replaced (← links)
- 05000331/LER-1983-041-99, /99X-0:on 831028,following Scram,Rcic Would Not Manually Trip.Solenoid Repaired & Reinstalled (← links)
- 05000331/LER-1991-007, :on 910806,inadvertent Inboard High Pressure Coolant Injection Steamline Isolation Occurred.Caused by Personnel Error.Rcic Speed Sensors Replaced & RCIC Turbine Insulation Pad Stenciled (← links)
- 05000331/LER-1991-008, :on 910807,automatic Emergency Diesel Generator Start Occurred.Caused by Momentary Emergency Bus Undervoltage During Electrical Storm.Rwcu Sys Placed Back in Svc (← links)
- 05000331/LER-1983-039-03, /03L-0:on 831017,review of Steam Line High Radiation Instruments Revealed Nonperformance of Scheduled 830725 Calibr.Caused by Personnel Error.Calibr Performed & Personnel Reinstructed (← links)
- 05000331/LER-1995-004, :on 950307,circuit Continuity Momentarily Lost During Installation of Jumper.Caused by Loosening of Nut Required to Insert Forklug Jumper.Cr Operators Verified That All Automatic Actions Occurred as Designed (← links)
- 05000331/LER-1995-002, :on 950224,group 1 Primary Containment Isolation Occurred.Caused by Seat Leakage Past Rack Isolation Valves.Isolation Valves Will Be Replaced (← links)
- 05000331/LER-1984-011, :on 840205,auto-isolation of Control Bldg Ventilation & Initiation of Intake Standby Filter Unit B Occured Due to Low Inlet Air Temp.Caused by Inadequate Circulation Through nonsafety-related Coils (← links)
- 05000331/LER-1983-038-03, /03L-0:on 830920,HPCI Turbine Vacuum Pump 1P-233 Motor Discovered Arcing.Probably Caused by Accumulated Oil on Motor Commutator.Motor Cleaned & Commutator Resurfaced (← links)
- 05000331/LER-1984-009, :on 840131,during Performance of LPCI Surveillance Test,Rhr Sys Discharge Piping Pressure Dropped to 0 Psig.Caused by Equipment Maladjustment.Position Indication on Two Valves in Question Adjusted (← links)
- 05000331/LER-1984-007, :on 840127,invalid Group III Automatically Initiated on hi-hi Radiation Alarm.Caused by Spurious Electrical Signal.High Radiation Cable Being Inspected for Possible Damage (← links)
- 05000331/LER-1984-008, :on 840123,facility Experienced Reactor Scram While in Normal Run Mode.Caused by Power Supply Failure. Reactor Maintained in Hot Shutdown Until Reactor Startup Corrected (← links)
- 05000331/LER-1983-035-03, /03L-0:on 830906,during Surveillance Testing,Lis 4531 & 4533 for Reactor Water low-low Tripped Nonconservatively at 113.2 & 113.4 Inches,Respectively. Caused by Instrument Drift.Switches Recalibr (← links)
- 05000331/LER-1983-036-03, /03L-0:on 830909,during Normal Operation,Visual Insp of Hfa Relays Revealed Relay A71B-K1B Deteriorated. Caused by Varnish Sticking Armature Closed.Relay Replaced (← links)
- 05000331/LER-1983-033-03, /03L-0:on 830903,HPCI Min Flow Return to Torus Line Valve MO-2318 Indication Intermittently Showed Valve Open.Hpci Declared Inoperable.Caused by Cracked Valve Yoke. Yoke Repaired & Tightened (← links)
- 05000331/LER-1995-001, :on 950128,both stand-by DGs Automatically Started.Caused by Sensed Momentary under-voltage Condition on Both Essential Buses.Operators Verified That Essential Buses Being Powered from Normal Source (← links)
- 05000331/LER-1984-001, :on 840107,feedwater Recirculation Valve B, Failed Open,Decreasing Feedwater Flow to Vessel.Caused by Error in Performing Surveillance Test Procedure.Both Valves Repaired.Test Procedure Revised (← links)
- 05000331/LER-1983-034-03, /03L-0:on 830906,during Average Power Range Monitor (APRM) Scram Instrument Functional Tests,Relay C71A- K12E Would Not Drop Out When Deenergized by Tripping APRM-E. Caused by Deterioration & Overheating of Coil (← links)
- 05000331/LER-1984-004, :on 840110 & 11,normal Control Bldg Ventilation Sys Isolated Due to Low Inlet Air Temp & Both Trains of Makeup Air Standby Filter Units Failed to Initiate Properly. Cause Unknown.Investigation Under Way (← links)
- 05000331/LER-1984-002, :on 840103,HPCI Inboard Steam Supply Isolation Valve Declared Inoperable.Caused by Technician Mistakenly Installing Jumper Across Relay Contact.Jumper Removed Allowing Valve to Open & Return to Svc (← links)
- 05000331/LER-1983-022-03, /03L-0:on 830630,during Surveillance Testing,Found HPCI Pump Governor Not Responding to Test Potentiometer Nor Manual Flow Controller.Caused by Governor Electrohydraulic Actuator Failing Due to Moisture (← links)
- 05000331/LER-1984-003, :on 840102,04,06 & 16,auto-initiations of Control Bldg Ventilation Sys,Isolation Mode,Occurred from Main Inlet Air Low Temp.Caused by Inadequate Circulation. Damaged Coils Removed for Repair (← links)
- 05000331/LER-1984-005, :on 840102,RHR/core Spray Fill Pump Motor Tripped by Circuit Breaker Thermal Overload Relay.Caused by Pressure Below 40 Psig Having Potential for Air Ingress. Tech Spec Amend Requested & Fill Pump Rebuilt (← links)
- 05000331/LER-1983-048-03, /03L-0:on 831230,containment Atmosphere Monitor B (RE-8103B) Declared Inoperable Due to Inadequate Process Line Flow.Caused by Moisture Problems W/Magnehelic Flow Switch.Heat Tracing Rerouted (← links)
- 05000331/LER-1982-080-03, River Water Supply Sys Traveling Screen Wash Pump 1P-112B Found W/Discharge Head Below Tech Spec Requirement for Traveling Screen 1F-36B. Caused by Unaligned Pump & Motor.Pump/Motor Realigned (← links)
- 05000331/LER-1983-002-03, /03L-0:on 830124,during Normal Operation,Drywell to Torus Low Differential Pressure Alarm Received.Caused by Valve CV-4316 Not Opening Properly Due to Inadequate Calibr. Design Review Initiated (← links)
- 05000331/LER-1983-047-03, /03L-0:on 831220,ASME Inservice Test Revealed 15.2 Closing of Inboard Steam Line Drain Valve MO-4423, Exceeding 15 Max.Cause Not determined.MO-4423 Stroke Time Adjusted & Returned to Svc During Shutdown (← links)
- 05000331/LER-1983-037-03, /03L-0:on 830915,during Surveillance Test,Rod Block Monitor Channel B Prevented Movement of Rod 26-07, Causing Inoperability of Channel.Caused by Wiring Problem. Component Replaced (← links)
- 05000331/LER-1983-031-03, /03L-0:on 830816,during Operation,One of Two Torus Level Recorders Failed Downscale.Caused by Intermittent Opening of Flexible Ribbon Cable.Cable Replaced.Recorder Calibr (← links)
- 05000331/LER-1983-032-01, /01T-0:on 830904,while Running Operability Tests for Hpci,Discovered RCIC Outboard Steam Isolation Valve MO-2401 Open.Caused by Valve Operator Torque Switch Tripping.Torque Switch Replaced (← links)
- 05000331/LER-1991-006, :on 910711,PCIS Group III Isolation Occurred Due to Blown Fuse Associated W/Refuel Pool Exhaust Radiation Monitor.Blown Fuse Replaced W/O Further Problems (← links)
- 05000331/LER-1983-024-01, /01T-0:on 830711,engineering Evaluation of 3/4- Inch Pipe Calculated Pipe Stress Above ASME Design Basis Code Allowables But Below Ultimate Strength for DBA Conditions.Caused by Ae Removing Support (← links)
- 05000331/LER-1994-013, :on 941111,reactor Water Cleanup Sys Isolation Due to Failed Head Gasket on Filter Demineralizer 1T203A. Insp of Flange & Closure Bolts on 1T203A Filter Demineralizer Revealed No Damage (← links)
- 05000331/LER-1982-064-03, Standby Filter Unit B Heater Tripped on Sheath Overtemp.Caused by Low Setting of 500 F.Setting Increased to 550 F.Engineering Evaluation Will Determine Optimum Setting (← links)
- 05000331/LER-1994-012, :on 941004,essential Bus Degraded Voltage Relay Calibr Errors Discovered Due to Failure to Use Line Corrector During Calibr.Surveillance Test Procedure 42B030-A Revised (← links)
- 05000331/LER-1983-026-03, /03L-0:on 830809,during Surveillance Testing, Auxiliary Relay in Main Steam Isolation Logic Failed to Deenergize.Caused by Melted Relay Coil Varnish.Relay Replaced (← links)
- 05000331/LER-1983-030-03, /03L-0:on 830812,diesel Generator (DG) Unit/ Parallel Switch on DG Control Panel Bumped Causing 1G-31 to Be Aligned in Parallel Rather than Control Mode.Caused by Personnel Error.Switch Reset (← links)
- 05000331/LER-1983-029-03, /03L-0:on 830809,during Normal Operations,Both Doors of Reactor Bldg Airlock Found Open Simultaneously. Caused by Blown Interlock Fuse & Loose Wire.Interlock Repaired (← links)
- 05000331/LER-1983-023-03, /03L-0:on 830528,during Normal Operation Surveillance Testing,Control Bldg B Discharge Valve AV-7318B Would Not Open in Manual or Auto Mode.Caused by Plugged Dirt in Pilot Positioner.Positioner Cleaned (← links)
- 05000331/LER-1983-027-03, /03L-0:on 830803,RCIC Discharge Pressure Indicator Found Indicating Improperly.Caused by out-of-calibr Pressure Transmitter.Transmitter Calibr (← links)
- 05000331/LER-1983-025-03, /03L-0:on 830720,250-volt Battery Voltage Found at 242 Volts During Surveillance Testing.Caused by Failure of Zener Diode.Failed Battery Charger Repaired.Battery Voltage Recording Requirements Instituted (← links)
- 05000331/LER-1994-007, :on 940529,partial PCIS Group IV Actuation Isolated RHR System Suction Piping Due to Pressure Surge in B Recirculation Pump Suction Piping.Changes to RHR & Plant Shutdown Procedures Have Been Initiated (← links)
- 05000331/LER-1983-008-31, /03L-0:on 830326,eight Accessible Hydraulic Snubbers Visually Inspected & Deficiencies Noted. Surveillance Procedure STP 46H002 Revised to Address Mechanical Aspects in Addition to Hydraulic Mechanism (← links)
- 05000331/LER-1994-011, :on 940718,recognized That Surveillance Test Requirement to Demonstrate Operability of a Channel RBM Had Not Been Performed.Caused by Personnel Error.Faulty Rod Select Switch in RMCS Was Replaced (← links)
- 05000331/LER-1983-015-03, /03l-0:on 830517,during Routine Surveillance, 4 Kv Essential Bus Degraded Voltage Relay 127/A1 Tripped Out of Spec at 8.6 S.Caused by Instrument Drift.Time Setting Adjusted & Relay Tested Satisfactorily (← links)
- 05000331/LER-1994-010, :on 940710,manual Scram Was Inserted in Response to Impending Loss of EHC Reservior Level.Caused by Crack in 1 EHC Tubing.Repaired Ruptured Tubing & Installed Accumulators on Cvs (← links)
- 05000331/LER-1983-013-01, /01T-0:on 830215,two MSIVs Exceeded Tech Spec Acceptance Criteria.Caused by Wear on Valve Seats.Valve Seats Reworked.Reportability of Event as LER Established on 830505 (← links)
- 05000331/LER-1983-010-03, /03L-0:on 830411,during Refueling Outage,One Snubber Found Inoperable,One Indeterminant,One Had Missing Bushing & One W/Bushing Disengaged.Caused by Procedure Error During Previous Maint (← links)
- 05000331/LER-1983-012-01, /01T-0:on 830425,full Scram Should Have Been Received When Mode Switch Moved from Refuel to Shutdown, However,Sys a Did Not Trip.Caused by Faulty Solder Connection on Rectifier.Connections Resoldered (← links)
- 05000331/LER-1983-004-03, /03L-0:on 830208,during Surveillance Testing,Rcic motor-operated full-flow Test Valve MOV-2515 Would Not Properly Control Flow.Caused by Loose Valve Stem anti- Rotation Collar Due to Worn,Loose Set Screws (← links)
- 05000331/LER-1983-006-03, /03L-0:on 830211,during Normal Operation,Power Lost to MSIV D Leakage Control Sys.Caused by Blown Fuse Due to Random Failure of High Alarm Relay B21 K2D.Fuse Replaced. Replacement of Relay Under Consideration (← links)
- 05000331/LER-1983-009-03, /03L-0:on 830221,during Cold Shutdown Surveillance testing,PS-1917A & PS-1917B Tripped Out of Spec Low at 93 & 89 Psig,Respectively.Caused by Instrument Drift. PS-1917A & PS-1917B Recalibr (← links)
- 05000331/LER-1982-075-03, During Shutdown Drywell purge,PDIS-4305 Opened Rx Bldg to Suppression Chamber Vacuum Breaker CV-4305 Conservatively & Would Not Reset to Close. Caused by Instrument Drift (← links)
- 05000331/LER-1983-001-03, /03L-0:on 830104,during Surveillance Testing,Steam Discovered Escaping from RCIC Turbine Hydraulic Governor Valve HV-2406.Caused by Gasket Failure.Gasket Replaced (← links)
- 05000331/LER-1982-083-03, /03L-0:on 821228,while Conducting QC Surveillance, RHR Sys Hydraulic Snubber Found Leaking Hydraulic Fluid & Declared Inoperable.Caused by Inservice Seal Degradation. New Snubber Installed & Inspected W/Satisfactory Results (← links)
- 05000331/LER-1994-005, :on 940419,missed Surveillances of RWM Occurred Due to Misinterpretation of TS Requirements.Tss Revised to Remove Misleading Wording & STP Revised to Assure Complete Testing During Next Shutdown (← links)
- 05000331/LER-1982-081-03, /03L-0:on 821123,standby Filter Unit Heater B Tripped on Overtemp.Caused by Inoperable Controller EC-7304B Due to Failure of Operable Amplifier in Controller Circuitry.Operable Amplifier Replaced (← links)
- 05000331/LER-1994-009, :on 940609,hi Flow Alarm Was Received on Control Room Panel 1C03 Due to Failed Differential Pdt. Replaced Pdt W/Model That Is Not Conducive to Entrapment of Water in Its Housing & Procedure Revised (← links)
- 05000331/LER-1982-076-03, /03L-0:on 821108,during Shutdown Surveillance Testing,Drywell Pressure Switch PS-4310C Tripped at 2.2 Psig Instead of Tech Spec Setpoint of 1.5 Plus/Minus 0.5 Psig Increasing.Caused by Setpoint Drift.Switch Recalibr (← links)
- 05000331/LER-1994-008, :on 940517,determined That Testing Had Not Been Performed at Required Surveillance Frequency for Reactor High Pressure Scram Pressure Switch.Caused by Inadequate Tracking.Appropriate Half Scram Inserted (← links)
- 05000331/LER-1982-061-03, /03L-0:on 820914,RHR Svc Water Pumps 1P-22A & 1P-22D Failed to Meet Tech Spec Requirements.Caused by Excessive Clearances Between Pump Impellers & Casing Wear Rings Due to Pump Wear.Impellers Adjusted & Pumps Tested (← links)
- 05000331/LER-1982-062-03, /03L-0:on 820922,surveillance Testing Pressure Differential Switch PDS-4304,controlling Reactor Bldg to Suppression Chamber Vacuum Breaker CV-4304,tripped Below Tech Spec Limit.Caused by Instrument Drift.Switch Recalibr (← links)
- 05000331/LER-1982-063-03, /03L-0:on 820927,reactor Bldg Isolation Damper 1V-AD-17B3,reducing Transport of Airborne Contamination from Reactor Bldg,Failed to Close Upon Receipt of Isolation Signal.Caused by Rust on Piston & Cylinder (← links)
- 05000331/LER-1983-005-03, /03L-0:on 830211,river Water Supply Sys Pumps 1P-117B & 1P-117D Declared Inoperative When ASME Allowables Exceeded.Caused by Instrument Error.Instrumentation Will Be Recalbr & Tested Before Startup from Refueling (← links)
- 05000331/LER-1982-077-03, /03L-0:on 821116,during Surveillance Testing,Rhr Svc Water Pump 1P-22D Failed to Meet Tech Spec Requirements. Caused by Loose Impeller on Shaft.Cause Under Investigation. Pump Rebuilt (← links)
- 05000331/LER-1982-079-03, /03L-0:on 821117,B Core Spray Sys Header to Top of Core Plate High Differential Pressure Switch Tripped at 2.1 Psid.Caused by Instrument Drift.Switch Recalibr & Tested Satisfactorily (← links)
- 05000331/LER-1982-073-03, /03L-0:on 821102,monthly Surveillance Test of Standby Diesel Generator Fuel Oil Not Performed in Prescribed Time for Oct.Caused by Personnel Error. Responsible Personnel Disciplined (← links)
- 05000331/LER-1994-001-01, :on 940107,determined That Test of Average Power Range Monitor High Flux Scram Trip Setpoint Inadequate.Caused by Unawareness of Test Requirement.Test Verified Clamping Function Set Properly (← links)
- 05000331/LER-1982-072-03, /03L-0:on 821026,pressure Switches Controlling Reactor Bldg to Suppression Chamber Vacuum Breakers Tripped Conservatively.Caused by Instrument Drift Due to Large Range of Switches Resulting in Decreased Setpoint Accuracy (← links)
- 05000331/LER-1982-070-03, /03L-0:on 821019,while Reviewing Surveillance Test Procedures,Discovered Monthly Surveillance of Reactor Low Low Level Protection Sys Trip Function Not Performed During Sept.Caused by Personnel Error.Personnel Disciplined (← links)
- 05000331/LER-1982-067-03, /03L-0:on 821012,LPCI Injection Valve A,MOV-2003 Failed to Close.Caused by Excessive Torque from Binding Operator Due to Loose Yoke Ring Resulting from Inadequate Maint & Personnel Training.Bolt Torqued (← links)
- 05000331/LER-1982-069-03, /03L-0:on 821018,power Lost to MSIV Leakage Control Sys C Logic.Caused by Fuse Blown by Random Failure of MSIV-C Loss of Power Alarm Relay B21-K12C.Relay Removed & Fuse Replaced (← links)
- 05000331/LER-1982-066-03, /03L-0:on 821012,torus Water Level Recorder a (LR-4384) Found Indicating Reduced Level.Recorder B (LR-4385) Indicated Proper Level.Caused by Recorder a Being Out of Calibr Due to Instrument Drift.Recorder Recalibr (← links)
- 05000331/LER-1982-065-03, /03L-0:on 820929,during Normal Operation,Racking Mechanism Access Door for Breaker 1B-4401 Found Open.Cause Unknown.Access Doors for 1B-3401 & 1B-4401 Will Be Locked & Maint Procedures Changed (← links)
- 05000331/LER-1982-056-01, /01T-0:on 820912,HPIC Area Steam Leak Alarm Activated by Temp Differential Switch TD8-2260A,resulting from Leak Due to Temp Difference Between Ventilation Intake & Exhaust.Caused by False Signal Due to Resistor Failure (← links)
- 05000331/LER-1982-055-03, /03L-0:on 820819,torus a Water Level Recorder, LR-4384,indicated Reduced Level While B Recorder LR-4385 Did Not Change.Caused by Associated Level Transmitter LI-4363 Being Out of Calibr.Other Causes Being Investigated (← links)
- 05000331/LER-1983-003-03, /03L-0:on 830125,during Surveillance Testing, Barton Reactor Low Water Level Indicating Switch LIS-4592A Tripped Out of Spec.Caused by Instrument Drift.Switch Recalibr (← links)
- 05000331/LER-1982-052-03, /03L-0:on 820809,during Normal Operation Surveillance Testing,Drywell Pressure Switch PS-4312C Tripped & Would Not Reset Properly Upon Decreasing Pressure. Caused by Instrument Drift.Switch Recalibr (← links)
- 05000331/LER-1981-014-01, Four Relief & Safety Valves Found Out of Spec.Cause Unknown.Relief Valve Pilot Assemblies Cleaned,Reworked & Satisfactorily Retested. Safety Valve Will Be Disassembled & Reworked (← links)
- 05000331/LER-1982-031-03, During Surveillance Testing,Pressure Differential Switch Tripped at Out of Spec Value.Caused by Instrument Drift Due to Decreased Setpoint Accuracy & Difficulty in Calibr.Switch Recalibr (← links)
- 05000331/LER-1981-021-03, During Reactor Startup, Suppression Chamber to Drywell Vacuum Breaker Valve Cv 4237H Did Not Close After Torus Inerting.Caused by Pneumatic Cylinder Piston Sticking in mid-position (← links)
- 05000331/LER-1994-004, :on 940214,standby Filter Unit a Declared Inoperable Due to Inappropriate Electric Heater Design Setpoints.Electric Heater Sheath Temp Trip Setpoints Raised (← links)
- 05000331/LER-1982-078-03, Air Discovered Leaking from Air Start Regulator on Crankcase of Standby Diesel Generator a 1G-31.Caused by Broken Air Inlet Line Due to Vibration.Tubing Reflared (← links)
- 05000331/LER-1982-059-03, /03L-0:on 820910,workmen in Reactor Core Isolation Cooling (RCIC) Room Reported Marked Increase in Room Temp. Caused by Broken Drive Belt in RCIC Room Cooling Unit 1V-AC-15A Due to Random Failure (← links)
- 05000331/LER-1982-058-03, /03L-0:on 820910,river Water Supply Sys Traveling Screen 1F-36B Would Not Run in Auto or Continuous Mode. Caused by Low Discharge Pressure for Screen Wash Pump. Permissive Pressure Switch PS-2903 Recalibr (← links)
- 05000331/LER-1982-057-03, /03L-0:on 820902,during Normal Operation,While Investigating River Water Intake Sys 1C-102 Trouble Alarm, Mode Switch HS-2906B Found in Off Position.Caused by Lack of Procedural Guidance.Procedures Under Review (← links)
- 05000331/LER-1982-054-03, /03L-0:on 820816,RHR Svc Water Pump 1P22A Failed to Develop Required Discharge Pressure at Rated Flow.Caused by Normal Pump Wear Causing Excessive Clearances to Develop Between Pump Impeller & Casing Wear Rings.Impeller Adju (← links)
- 05000331/LER-1982-053-03, /03L-0:on 820813,train a of River Water Supply Sys Found Inoperable When Valve CV-4915 Failed to Open.Cause Not Identified.Instrument Air Pressure to Valve Operator Adjusted (← links)
- 05000331/LER-1994-003, :on 940124,determined That TS Table 3.2-A Action Statement for Off Gas Vent RMs Not Complied W/During Routine Maint on 940119 Due to Improperly Prepared Work Document.License Amend Process Revised (← links)
- 05000331/LER-1982-050-03, /03L-0:on 820727,while Replacing Alarm Cord,All Audible & Visual Alarm Indication Was Lost on Annunciator Cabinets A,B & C in Panel 1C03.Caused by Blown Fuse C71A-F4C in Power Supply.Fuse Replaced (← links)
- 05000331/LER-1994-001, :on 940107,determined That Test of APRM High Flux Scram Trip Setpoint Inadequate Due to Lack of Awareness.Surveillance Test Procedure for Testing Flow Biased APRM Scram Trip Setpoint Revised (← links)
- 05000331/LER-1982-038-03, /03L-0:on 820610,suppression Chamber to Drywell Vacuum Breaker Valve CV-4327D Opened & Failed to Close. Caused by Stuck Pneumatic Cylinder in Midposition,Due to Crud Accumulation.New O-rings,seals & Gaskets Installed (← links)
- 05000331/LER-1982-035-03, /03L-0:on 820607,reactor Core Isolation Cooling Steam Line High Flow Pressure Differential Indicating Switches PDTS 2441 & 2442 Tripped Low.Caused by Instrument Drift.Switches Recalibr.Design Change Underway (← links)
- 05000331/LER-1980-065-03, During Surveillance Testing Suppression Chamber Purge Inlet Valve CV-4308 Would Not Cycle,As Required by Tech Spec 3.7.D.1.Caused by Sticking Operator Mfg by Miller Fluid Power (← links)
- 05000331/LER-1993-012, :on 931129,primary Containment Isolation Sys Half Group 3 Isolation Occurred Due to Degraded Relay Contact in Logic Sys.Automatic Actions Confirmed,Isolation & Half Scram Reset & SBGT Secured (← links)
- 05000331/LER-1982-047-01, /01T-0:on 820729,during Testing,Pressure Differential Switches Which Control Reactor Bldg to Suppression Chamber Vacuum Breakers CV-4304 & CV-4305 Tripped Out of Spec.Caused by Instrument Drift (← links)
- 05000331/LER-1982-046-03, /03L-0:on 820730,main Steam Line C High Temp Indicating Switch TIS-4445 Subchannel 2 Tripped Outside Tech Spec.Caused by Instrument Drift.Switch Recalibr (← links)
- 05000331/LER-1982-045-03, /03L-0:on 820706,during Cold Shutdown Surveillance Testing,High Pressure Turbine Switches PS-1005A,C & D Tripped Above Tech Specs.Caused by Instrument Drift.Switches Recalibr & Retested (← links)
- 05000331/LER-1993-005, :on 930801,unacceptable MSIV Leak Rate Results Due to Excess Leakage Msiv.Replaced Integral Valve Seat & re-machined Valve Bore (← links)
- 05000331/LER-1993-009, :on 931005,HPCI Valve Tripped Breaker After Being Closed.Caused by Incorrect Torque Setting.Torque Switch & Motor Replaced (← links)
- 05000331/LER-1993-008, :on 930916,noted That Sbdg Output Breaker Failed to Close During Performance of LOOP-LOCA Surveillance Test.Caused by Procedural Inadequacy.Plant Procedures Revised to Address Auxiliary Switch (← links)
- 05000331/LER-1993-007, :on 930921,unexpected Shutdown Cooling Isolation Occurred Due to Procedural Inadequacies.Reopened Valve & Revised Procedure (← links)
- 05000331/LER-1993-011, :on 931111,control Bldg Chiller a Tripped During Normal Operation While Chiller B Removed from Svc for Preplanned Maint.Caused by Ineffective Setup for Low Load Conditions.Chillers Rebalanced (← links)
- 05000331/LER-1982-044-03, /03L-0:on 820629,B Control Bldg Standby Filter Unit Flow Controller Would Not Control Discharge Valve AV-7318B & Low Flow Alarm Could Not Be Cleared.Caused by Moisture in Instrument Air from Capacity Dryers (← links)
- 05000331/LER-1982-042-03, /03L-0:on 820616,during Cold Shutdown Surveillance Testing,Manual Breakers for Inlet Heater EC-5805A on Train a of Standby Gas Treatment Sys Found Open.Caused by Personnel Manually Opening Breakers (← links)
- 05000331/LER-1993-010, :on 931026,full Automatic Reactor Scram Occurred.Caused by Ground at Turbine Solenoid,Combined W/ Momentary Arc.Ground at Turbine Soleniod Valve Repaired.W/ (← links)
- 05000331/LER-1993-006, :on 930813,partial PCIS Group 3 Isolation Occurred Due to Inadequate Written & Verbal Communications. Event Will Be Reviewed by Engineering,Operations & Maint by 931201 to Stress Need for Good Communications (← links)
- 05000331/LER-1982-043-03, /03L-0:on 820624,pressure Differential Switches Which Control Reactor Bldg to Suppression Chamber Vacuum Breakers Cv 4304 & Cv 4305 Tripped Out of Spec.Caused by Instrument Drift.Switches Recalibr.Surveillance Continuing (← links)
- 05000331/LER-1982-040-03, /03L-0:on 820610,during Cold Shutdown Surveillance Testing,Jacket Coolant Sys on Standby Generator Found Leaking.Caused by Brass Pipe Nipple Broken by Weight of Pressure Indicator & Piping.Nipple Replaced (← links)
- 05000331/LER-1982-039-03, /03L-0:on 820610,standby Diesel Generator 1G-21 Failed to Start Using Normal Air Start Sys.Caused by Rusty Solenoid in Normal Air Start Solenoid Valve CV-3262.Solenoid Cleaned,Lubricated & Functionally Tested Satisfactory (← links)
- 05000331/LER-1982-041-03, /03L-0:on 820621,NRC Resident Inspector Found Isolation Valve V-18-07,for Scram Discharge Vol Level Scram Switch LS-1861A Open;But Not Properly Locked Open.Caused by Personnel Error.Valve Verified Open & Properly Locked (← links)
- 05000331/LER-1982-036-03, /03L-0:on 820525,during Surveillance Testing,Hpci Turbine Would Not Come Up to Speed in Test Mode.In Manual Control,Turbine Fast Started & Water Discharged to Torus, Exceeding Max Vol Level.Caused by Lack of Flow Path (← links)
- 05000331/LER-1982-037-03, /03L-0:on 820525,during Surveillance Testing, Reactor Core Isolation Cooling Sys Failed to Reach Design Flow of 400 Gpm While in Automatic Flow Control Mode.Caused by Incorrect Setting on Pump Flow Controller.Setting Reset (← links)
- 05000331/LER-1982-034-01, /01T-0:on 820602,MSIV Position Switch ZS4415 Failed to Operate within Tech Spec Limit.Caused by Broken Cylinder & Cap Screws.During 820522 Startup,Procedure Violation Found on MSIV Sequence.Procedures & Reviewed (← links)
- 05000331/LER-1982-033-03, /03L-0:on 820511,primary Containment Isolation Valve CV-4306 on Drywell & Torus Purge Supply Line Failed to Close Completely.Caused by Stuck Pneumatic Valve on Air Supply to Valve Operator CV-4306.Valve Cleaned (← links)
- 05000331/LER-1982-024-03, /03L-0:on 820310,high Flow Pressure Differential Indicating Switch 2442 Tripped at 118 Inches of Water on Reactor Core Isolation Cooling Steam Line.Caused by Instrument Drift.Switch Recalibr.Design Change Pursued (← links)
- 05000331/LER-1982-023-03, /03L-0:on 820309,while Performing Surveillance testing,4 Kv Emergency Bus Undervoltage Relay 127-3 Tripped Conservatively High at 29.2 Volts.Caused by Instrument Drift.Relay 127-3 Recalibr (← links)
- 05000331/LER-1982-030-03, /03L-0:on 820421,HPCI Steam Supply Pressure Switch PS-2246A Setpoint Found Above Tech Spec Limit.Caused by Instrument Drift.Switch PS-2246A Recalibr & Tested (← links)
- 05000331/LER-1982-030, Forwards LER 82-030/03L-0 (← links)
- 05000331/LER-1982-029-03, /03L-0:on 820419,during Normal Operation,Gate valve,MO-8401D,found to Have No Position Indication in Control Room & Could Not Be Operated from Control Room. Caused by Blown Control Fuse.Fuse Replaced (← links)
- 05000331/LER-1982-029, Forwards LER 82-029/03L-0 (← links)
- 05000331/LER-1982-028-03, /03L-0:on 820410,during Cold Shutdown,While Removing Pipe Insulation to Access RHR Fill Line Valves for Maint,External Corrosion Found on RHR Fill Pump 1P-70 Min Flow Line.Caused by Moisture Retention by Pipe Insulation (← links)
- 05000331/LER-1982-028, Forwards LER 82-028/03L-0 (← links)
- 05000331/LER-1982-026-03, /03L-0:on 820407,MSIV Leakage Control Sys (MSIV-LCS),pressure Switch PS-8404C Failed,Rendering Sys Inoperable.Caused by Corrosion on Terminal Strip.Terminal Strip Cleaned & Lubricated (← links)
- 05000331/LER-1982-026, Forwards LER 82-026/03L-0 (← links)
- 05000331/LER-1982-027-03, /03L-0:on 820411 Drywell Pressure Switches PS-4310C & PS-4312C Tripped at 2.35 & 2.45 Psig, Respectively.Caused by Instrument Drift.Switches Recalibr & Tested (← links)
- 05000331/LER-1982-027, Forwards LER 82-027/03L-0 (← links)
- 05000331/LER-1982-025-03, /03L-0:on 820404,suppression Chamber to Drywell Vacuum Breaker Valve CV-4327D Failed to Close Completely. Caused by Pneumatic Cylinder Piston Stuck in mid-position. Piston Lubed & Valve Tested Satisfactorily (← links)
- 05000331/LER-1982-025, Forwards LER 82-025/03L-0 (← links)
- 05000331/LER-1982-020-01, Standby Diesel Generator 1G-21 Tripped During Surveillance Testing.Caused by Procedural Deficiency,Allowing Fuel Oil Filter Change W/O Filling & Venting Filter Casings.Maint Procedures Written (← links)
- 05000331/LER-1982-020, Forwards Updated LER 82-020/01X-2 (← links)
- 05000331/LER-1980-054-01, During Plant Startup, Leaking Relief Valve PSV-4405 Stuck Open Causing Reactor Scram.Cause Unknown.Pilot Assembly Replaced (← links)
- 05000331/LER-1980-054, Forwards Updated LER 80-054/01X-1 (← links)
- 05000331/LER-1979-021-01, During Surveillance Testing Min Flow Valve (MOV 2009) for Rgr (LPCI) Pumps 1P-229A & 1P-229C Failed to Open.Caused by Stripped Operator Worm Gear.Worm,Gear,Quad Rings & O Rings Replaced (← links)
- 05000331/LER-1979-021, Forwards Updated LER 79-021/01X-1 (← links)
- 05000331/LER-1982-022-03, /03L-0:on 820305,HPCI Declared Inoperable When Preliminary Design Review Did Not Confirm Loose Mounting Plate on Spring Can Hanger EBB-14-H8.Caused by Degraded Condition of Red Head Concrete Expansion Bolts (← links)
- 05000331/LER-1982-022, Forwards LER 82-022/03L-0 (← links)
- 05000331/LER-1982-021-03, /03L-0:on 820302,during Normal Operation Surveillance Testing on Standby Gas Treatment Sys Charcoal Deluge Sys,A Train Found to Be Wet.Caused by Leaking Deluge Valve CV-5837 & Plugged Orifice in Drainline (← links)
- 05000331/LER-1982-021, Forwards LER 82-021/03L-0 (← links)
- 05000331/LER-1982-019-03, /03L-0:on 820225,during Surveillance Testing on Main Steam Line Tunnel Leak Detection Sys,Temp Switch TIS-4444 Failed to Operate.Caused by Faulty Capacitor in Power Supply.Sys Tested & Restored to Svc (← links)
- 05000331/LER-1982-019, Forwards LER 82-019/03L-0 (← links)
- 05000331/LER-1993-004, :on 930611,while Performing EDG Operability Surveillance,Edg a Tripped Approx 3 After Initial Start Signal.Possibly Caused by Partially Latched Condition of Trip Mechanism.Latch Will Be Reset (← links)
- 05000331/LER-1993-003, :on 930525,primary Containment Isolation Sys Half Group III Isolation Occurred Due to Loss of Jumper to Terminal Continuity During Planned Maint.Automatic Actions Confirmed & Signal Received Verified (← links)
- 05000331/LER-1982-018-03, /03L-0:on 820221,during Normal Operation, Supression Pool Level Transmitter LT-4363B Responded Erratically,Trending Downscale.Caused by Interference by RHR Repairs.Transmitter Removed from Svc,Pending Repairs (← links)
- 05000331/LER-1982-018, Forwards LER 82-018/03L-0 (← links)
- 05000331/LER-1982-016-03, /03L-0:on 820215,control Bldg Ventilation Sys Exhaust Isolation Damper Failed to Close Completely.Caused by Corrosion of Damper Operator Cylinder Due to Humidity. New Actuator Will Be Installed.Humidity Problem Studied (← links)
- 05000331/LER-1982-016, Forwards LER 82-016/03L-0 (← links)
- 05000331/LER-1982-014-03, /03L-0:on 820219,during Normal Operation,A RHR Loop Declared Inoperable Due to Failed Snubber GBB-4-SS-211 & Hanger GBB-4-H10.Caused by Minor Damage & Pipe Movement on a Rhr.Snubber Replaced & Hanger Repaired (← links)
- 05000331/LER-1982-014, Forwards LER 82-014/03L-0 (← links)
- 05000331/LER-1982-017-01, /01T-0:on 820307,during Surveillance Testing, Standby Filter Unit a for Control Bldg Ventilation Sys Discovered to Have Low Halogenated Hydrocarbon Removal Efficiency.Caused by Moisture in Charcoal Adsorber Bank (← links)
- 05000331/LER-1982-017, Forwards LER 82-017/01T-0 (← links)
- 05000331/LER-1982-015-01, /01T-0:on 820225,RHR Svc Water Valve MOV-1947 Failed to Close During Normal Operation.Caused by Wear of Valve Operator Stem Nut.Stem Nut MOV-1947 & Gaskets Replaced,Operator Lubricated & Limit Switches Reset (← links)
- 05000331/LER-1982-015, Forwards LER 82-015/01T-0 (← links)
- 05000331/LER-1982-013-01, /01T-0:on 820220,RHR Sys B Snubber GBB-3-SS-235 Removed from Svc for Testing.Caused by Snubber Pipe Clamp Rotated Out of Position & Bent Snubber Extension.Pipe Clamp Repositioned,Extension Straightened & Snubber Replaced (← links)
- 05000331/LER-1982-013, Forwards LER 82-013/01T-0 (← links)
- 05000331/LER-1982-012-03, /03L-0:on 820208,during Surveillance Testing,Msiv Leakage Control Sys Bypass Valve MOV-8403C Failed to Close. Caused by Failed Auxiliary Switch on Motor Starter Contractor Coil Mfg by Allis Chalmers.Switch Replaced (← links)
- 05000331/LER-1982-012, Forwards LER 82-012/03L-0 (← links)
- 05000331/LER-1982-010-03, /03L-0:on 820206,oxygen Analyzer B for Containment Atmosphere Dilution Sys Found Reading Upscale.Probably Caused by Corrosion on Contacts Due to Bad Connection Between Oxygen Analyzer Cell & Terminal Strip (← links)
- 05000331/LER-1982-010, Forwards LER 82-010/03L-0 (← links)
- 05000331/LER-1982-011-03, /03L-0:on 820208,self-cleaning Strainer IS-85B on Suction Line to Screen Wash Pump B for River Water Supply Sys Became Plugged.Caused by Failed Strainer Shear Pin. Strainer Cleared.Baskets,Cap,Gearbox & Shear Pin Replaced (← links)
- 05000331/LER-1982-011, Forwards LER 82-011/03L-0 (← links)
- 05000331/LER-1982-008-03, /03L-0:on 820121,LPCI Sys & RHR Svc Water Sys a Declared Inoperable Due to Piping Stress in Excess of Code Allowables.Cause Unknown.Snubber GBC-1-SS-56 & RHR Sys Valve Replaced (← links)
- 05000331/LER-1982-008, Forwards LER 82-008/03L-0 (← links)
- 05000331/LER-1982-009-01, /01T-0:on 820205,secondary Containment Integrity Violated by Inadvertently Opening Inner Railroad Airlock Personnel Door While Outer Reactor Bldg Door Was Open.Caused by Personnel Error W/Failed Solenoid Contributing (← links)
- 05000331/LER-1982-009, Forwards LER 82-009/01T-0 (← links)
- 05000331/LER-1982-002-03, /03L-0:on 820112,reactor Core Isolation Cooling Steam Line High Flow Pressure Differential Indicating Switches PDIS2441 & 2442 Tripped at 118 & 125 Inches of Water.Caused by Instrument Drift.Switches Recalibr (← links)
- 05000331/LER-1982-002, Forwards LER 82-002/03L-0 (← links)
- 05000331/LER-1982-004-03, /03L-0:on 820115,drywell High Pressure Switch Ps 4315B Tripped out-of-spec.Caused by Instrument Drift. Switch Recalibr (← links)
- 05000331/LER-1982-004, Forwards LER 82-004/03L-0 (← links)
- 05000331/LER-1982-005-03, /03L-0:on 820114,torus Water Level Recorder Lr 4385 Found in Failed Downscale Condition.Caused by Excessive Heat Buildup in Recorder Cabinet Due to Poor Ventilation. Cabinet Being Kept Open Temporarily to Increase Cooling (← links)
- 05000331/LER-1982-005, Forwards LER 82-005/03L-0 (← links)
- 05000331/LER-1982-007-01, /01T-0:on 820204,reactor Core Isolation Cooling Injection Valve MOV 2512 Was Opened & Then Would Not Close. Caused by Motor Operator Circuit Breaker Close Contractor Coil Being Opened.Coil Replaced (← links)
- 05000331/LER-1982-007, Forwards LER 82-007/01T-0 (← links)
- 05000331/LER-1982-006-03, /03L-0:on 820114,B Oxygen Analyzer for Containment Atmosphere Dilution Sys Found Inoperable W/Low Flow on Span & Zero Gas.Caused by Defective Procedures.Bypass Flow Adjusted.Procedures Will Be Revised (← links)
- 05000331/LER-1982-006, Forwards LER 82-006/03L-0 (← links)
- 05000331/LER-1982-003-03, /03L-0:on 820113,while Performing Surveillance Testing,Reactor Vessel Pressure Switch Ps 4529 Tripped Below Tech Spec Limit.Caused by Instrument Drift.Switch Recalibr (← links)
- 05000331/LER-1982-003, Forwards LER 82-003/03L-0 (← links)
- 05000331/LER-1982-001-03, /03L-0:on 820108,subchannel B of Tis 4477 to Turbine Bldg Main Steam Line Leak Detection Sys Found W/ Nonconservative Trip Setting Greater than Tech Spec Limit. Caused by Instrument Drift.Tis 4477 Recalibr & Tested (← links)
- 05000331/LER-1982-001, Forwards LER 82-001/03L-0 (← links)
- 05000331/LER-1981-048-03, /03L-0:on 811223,pressure Differential Switch Which Controls Reactor Bldg to Suppression Chamber Vacuum Breaker Cv 4305 Tripped at Out of Tech Spec Value.Caused by Instrument Drift.Switch Recalibr & Functionally Tested (← links)
- 05000331/LER-1981-048, Forwards LER 81-048/03L-0 (← links)
- 05000331/LER-1981-049-03, /03L-0:on 811208,both Torus Level Indications Momentarily Out of Svc.Caused by Failure of Technicians to Obtain Shift Supervisor Authorization Prior to Starting Calibr Test.Instrument Calibr & Employee to Be Disciplined (← links)
- 05000331/LER-1981-049, Forwards LER 81-049/03L-0 (← links)
- 05000331/LER-1981-046-03, /03L-0:on 811201,control Bldg Ventilation Sys Exhaust Isolation Damper Failed to Close Rendering a Control Room Standby Filter Unit Inoperable.Caused by Misalignment of Damper Operator.Repair Procedure to Be Corrected (← links)
- 05000331/LER-1981-046, Forwards LER 81-046/03L-0 (← links)
- 05000331/LER-1981-044-03, /03L-0:on 811124,secondary Containment Isolation Damper on Air Ejector Room Exhaust Duct to Offgas Stack Failed to Close Completely When Operating Air Secured to Protect Damper.Cause Unknown.Investigation Continuing (← links)
- 05000331/LER-1981-044, Forwards LER 81-044/03L-0 (← links)
- 05000331/LER-1981-045-03, /03L-0:on 811124,control Bldg Ventilation Sys Exhaust Damper Failed to Close,Rendering a Control Room Standby Filter Unit Inoperable.Caused by Misalignment Between Do & Damper Shafts Due to Repair Procedure Defect (← links)
- 05000331/LER-1981-045, Forwards LER 81-045/03L-0 (← links)
- 05000331/LER-1981-047-03, /03L-0:on 811204,high Drywell Pressure Switch PS-4311B Trip Setpoint Found to Be Out of Tolerance.Caused by Instrument Drift.Switch Recalibr (Static-O-Ring Model 12N-AA5) (← links)
- 05000331/LER-1981-047, Forwards LER 81-047/03L-0 (← links)
- 05000331/LER-1981-043-01, /01T-0:on 811208,negative 24-volt de-charger Was Putting Out Only 21 Volts.Cause Undetermined.During Trouble Shooting,Charger Resumed Normal Output (← links)
- 05000331/LER-1981-043, Forwards LER 81-043/01T-0 (← links)
- 05000331/LER-1981-042-03, /03L-0:on 811114,no Full Out or Position 48 Indication Received for CRD 26-15.During Withdrawal,Rod Overtravel Alarm Received.Probably Caused by Improperly Engaged Inner Filter in Crd.Crd Repositioned (← links)
- 05000331/LER-1981-042, Forwards LER 81-042/03L-0 (← links)
- 05000331/LER-1981-040-01, /01T:on 811118,personnel Attempted to Cycle Reactor Water Cleanup Sys Return Isolation Valve MOV-2740 But No Flow Change Occurred.Caused by Loose Valve Stem Clamp Set Screw & Clamp Screw Dropping Out (← links)
- 05000331/LER-1981-040, Forwards LER 81-040/01T-0 (← links)
- 05000331/LER-1981-041-03, /03L-0:on 811106,during Normal Operation,Pinhole Leak Discovered in Reactor Water Cleanup Sys.Caused by Intergranular Stress Corrosion Cracking.Pipe Section Replaced W/Piping of Lower Carbon Content (← links)
- 05000331/LER-1981-041, Forwards LER 81-041/03L-0 (← links)
- 05000331/LER-1981-039-01, /01T-0:on 811117,instrument Line Drain Valve V-18-20 for B Scram Instrument Vol Level Switch LS-1861 Found Locked Open.Caused by Personnel Error During Monthly Surveillance Test.Valve Locked Closed (← links)
- 05000331/LER-1981-039, Forwards LER 81-039/01T-0 (← links)
- 05000331/LER-1981-038-03, /03L-0:on 811030,following Reactor Startup,Drywell Oxygen Concentration Not Reduced to Less than 4% within 24-h of Mode Switch Being Placed in Run.Caused by Inoperable Auxiliary Boiler Feed Pumps (← links)
- 05000331/LER-1981-038, Forwards LER 81-038/03L-0 (← links)
- 05000331/LER-1993-002, :on 930428,determined That Testing Program for Primary Containment Airlock Not in Full Compliance W/Ts Due to Different Interpretations of 1984 TS Rev Based on 1978 Submittal.Ts Rev Will Be Submitted (← links)
- 05000331/LER-1993-001, :on 930211,discovered Automatic Standby DG Starts Due to Momentary Essential Bus Undervoltage Due to Ice Storm.Operators Took Appropriate Actions to Restore RWCU & Well Water Sys (← links)
- 05000331/LER-1990-001, :on 900315,standby Emergency Diesel Generators Auto Started.Caused by Switchyard Component Failure.Failed Components Replaced & Preventive Maint Action for Periodic Thermographic Insp of Components Established (← links)
- 05000331/LER-1981-037-01, /01T-0:on 811017,during Valve Lineup Check,Main Steam Line Leakage Control Sys D Manual Valve V-84-16 Was Found Closed.Caused by Valving Error Due to Poor Lighting & Accessibility & Lack of Valve Labels.Lineup Performed (← links)
- 05000331/LER-1981-037, Forwards LER 81-037/01T-0 (← links)
- 05000331/LER-1981-036-03, /03L-0:on 810921,RHR Svc Water Sys Pump 1P-22C Would Not Develop Required Discharge Pressure at Rated Flow. Caused by Excessive Clearances Developing Between Pump Impeller & Casing Wear Rings.Pumps Adjusted (← links)
- 05000331/LER-1981-036, Forwards LER 81-036/03L-0 (← links)
- 05000331/LER-1981-035-03, /03L-0:on 810906,during Daily Surveillance Testing,Drywell Oxygen Concentration Found Exceeding Limit. Caused by Personnel Error & Unreliable Instrumentation. Drywell Inerting Begun (← links)
- 05000331/LER-1981-035, Forwards LER 81-035/03L-0 (← links)
- 05000331/LER-1981-034-01, /01T-0:on 810915,HPCI Inboard Steam Supply Isolation Valve MOV 2238 Closed.Caused by Personnel Error Due to Incorrectly Placed Test Jumper.Valve Closure Annunciated & Immediate Action Taken to Restore Sys (← links)
- 05000331/LER-1981-034, Forwards LER 81-034/01T-0 (← links)
- 05000331/LER-1981-031-03, /03L-0:on 810820,reactor Core Isolation Cooling Suppression Pool Area Steam Leak Detection Temp Differential Switch TDS-2521C Found Tripping at Value Exceeding Tech Spec Limit.Caused by Instrument Drift.Switch Recalibr & Tes (← links)
- 05000331/LER-1981-031, Forwards LER 81-031/03L-0 (← links)
- 05000331/LER-1981-032-03, /03L-0:on 810812,containment Atmosphere Monitoring Sys a & B Found to Be Operating W/O Reselection of Sample Points,Resulting in Containment Atmosphere Not Being Monitored.Caused by Personnel Error.Design Review Initiated (← links)
- 05000331/LER-1981-032, Forwards LER 81-032/03L-0 (← links)
- 05000331/LER-1981-033-03, /03L-0:on 810817,reactor Core Isolation Cooling Sys Declared Inoperable to Replace Motor Operated Full Flow Test Valve MOV-2515.Caused by Pinhole Leak in Valve Body. Valve Hydrostatically Tested (← links)
- 05000331/LER-1981-033, Forwards LER 81-033/03L-0 (← links)
- 05000331/LER-1982-071-03, /03L-0:on 821024,suppression Pool Water Temp Recorder TR-4386B Found Inoperable.Caused by Random Failure of Pen 1 Motor.Motor Replaced & Recorder Returned to Svc (← links)
- 05000331/LER-1982-071, Forwards LER 82-071/03L-0 (← links)
- 05000331/LER-1982-074-03, /03L-0:on 821101,control Rod Drive Scram Discharge Vol Valves V-18-07,V-18-08 & V-18-16 in Proper Position But Not Properly Locked.Caused by Lack of Procedural Guidance for Wrapping Locking Chain.Valves Locked (← links)
- 05000331/LER-1982-074, Forwards LER 82-074/03L-0 (← links)
- 05000331/LER-1982-051-03, /03L-0:on 820809,reactor Core Isolation Cooling Steam Line High Pressure Differential Indicating Switch PDIS-2442 Tripped Out of Spec at 98 Inches of Water.Caused by Instrument Drift.Switch Recalibr & Tested (← links)
- 05000331/LER-1982-051, Forwards LER 82-051/03L-0 (← links)
- 05000331/LER-1983-017-03, /03L-0:on 830523,while Operating in Torus Cooling Mode,Pressure Differential Across RHR Svc Water Strainer 1S-90B Increased.Caused by Sheared Motor Coupling Shear Pins.Two Shear Pins Installed (← links)
- 05000331/LER-1983-021-01, /01T-0:on 830527,containment H202 Analyzer Channel a Rendered Inoperable.Caused by Calibr Difficulties Due to Fouled Pressure Regulators Resulting from Sys Contamination. Tech Specs Revised (← links)
- 05000331/LER-1983-014-03, /03L-0:on 830428,relay B21-K2A Did Not Pick Up as Required on High Flow Signal.Caused by Sticking Plunger in Flow Meter & Faulty Capacitor in Flow Switch Circuit.Plunger Freed & Capacitor Replaced (← links)
- 05000331/LER-1981-030-03, /03L-0:on 810701,torus Atmosphere Sampling Line Isolation Valve SV-8108A Would Not Close During Testing. Caused by Rust in Mechanical Portion of Solenoid,Impeding Proper Operation.Solenoid Dismantled & Cleaned (← links)
- 05000331/LER-1981-030, Forwards LER 81-030/03L-0 (← links)
- 05000331/LER-1981-029-03, /03L-0:on 810701,during Testing,Containment Atmosphere Monitoring Sys (Cams) a Found to Be Operating W/O Sample Point Having Been Reselected.Cams B Inoperable Due to Testing.Caused by Personnel Error (← links)
- 05000331/LER-1981-029, Forwards LER 81-029/03L-0 (← links)
- 05000331/LER-1981-028-03, /03L-0:on 810703,during Control Room Panel Check, HPCI Pump Discharge Flow Indicating Controller FIC-2309 Found Indicating Low.Caused by Erroneous Indication of HPCI Flow Rate Due to Air Lock in HPCI Flow Indication Lines (← links)
- 05000331/LER-1981-028, Forwards LER 81-028/03L-0 (← links)
- 05000331/LER-1981-027-03, /03L-0:on 810620,radiation Monitor RM-4101A Failed Upscale.Caused by Component Failure.Equipment Drawer Replaced (← links)
- 05000331/LER-1981-027, Forwards LER 81-027/03L-0 (← links)
- 05000331/LER-1981-026-03, /03L-0:on 810615,containment Atmosphere Monitoring Sys B Was Found Operating W/O Sample Point Selected.Caused by Personnel Error.Particulate Radiation Element Replaced (← links)
- 05000331/LER-1981-025-03, /03L-0:on 810616,RHR B Svc Water Pump Did Not Develop Required Discharge Pressure at Rated Flow.Caused by Normal Wear Creating Excessive Clearances Between Impeller & Casing Rings.Impellers Adjusted (← links)
- 05000331/LER-1981-025, Forwards LER 81-025/03L-0 (← links)
- 05000331/LER-1981-024-03, /03L-0:on 810616,drywell Equipment Drain Line Valve CV-3729 Did Not Give Fully Closed Indication During Testing.Caused by Seat Leakage in Solenoid Valve SV-3729. Solenoid Valve Replaced (← links)
- 05000331/LER-1981-024, Forwards LER 81-024/03L-0 (← links)
- 05000331/LER-1981-023-03, /03L-0:on 810611,during Surveillance Testing, Reactor Core Isolation Cooling Steam Line High Flow Pressure Differential Switch Pdis 2442,tripped at 100 Inches of Water.Caused by Instrument Drift.Switch Recalibr (← links)
- 05000331/LER-1981-023, Forwards LER 81-023/03L-0 (← links)
- 05000331/LER-1981-022-03, /03L-0:on 810607,during Testing,Reactor Core Isolation Cooling Turbine Repeatedly Tripped on Overspeed on Fast Starts.Caused by Upward Drift of Flow Controller FIC-2509 High Limit Setpoint.Setpoint Recalibr (← links)
- 05000331/LER-1981-022, Forwards LER 81-022/03L-0 (← links)
- 05000331/LER-1981-020-01, /01T-0:on 810527,primary Containment Integrity Breached When Inner & Outer Airlock Doors Were Open Simultaneously While H/P Technician Exited Drywell.Cause Unknown (← links)
- ML090960312 (redirect page) (← links)
- 05000331/LER-2009-004, Regarding Unplanned Automatic Reactor Scram Due to an Invalid Reactor Protection Signal (← links)
- 05000331/LER-2009-003, Regarding Unplanned Manual Scram Due to Increasing Reactor Water Level (← links)