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The following pages link to 05000254/LER-2019-001, HPCI System Inoperable Due to Blown Fuse in the Motor Speed Changer Circuit:
Displayed 4 items.
- ML19095A380 (redirect page) (← links)
- 05000254/LER-2019-003, Water Found in Control Room Emergency Ventilation Air Filtration Unit (← links)
- 05000254/LER-2019-002, Phase to Ground Fault in Isolated Phase Bus Duct Led to Generator Trip and an Automatic Scram (← links)
- 05000254/LER-2019-001 (redirect page) (← links)
- 05000254/LER-2002-001 (← links)
- IR 05000254/2019002 (← links)
- 05000254/LER-1982-017, Forwards LER 82-017/03L-0 (← links)
- 05000254/LER-1982-016, Forwards LER 82-016/03L-0 (← links)
- 05000254/LER-1982-010, Forwards LER 82-010/03L-0 (← links)
- 05000254/LER-1982-009, Forwards LER 82-009/03L-0 (← links)
- 05000254/LER-1994-005, Forwards LER 94-005-00.Suppl Rept Will Be Issued,Documenting Valves & Penetrations That Had Excessive Leakage,What Caused Leakage & Corrective Actions (← links)
- 05000254/LER-1982-028, Forwards LER 82-028/03L-0 (← links)
- 05000254/LER-1982-024, Forwards LER 82-024/03L-0 (← links)
- 05000254/LER-1982-023, Forwards LER 82-023/03L-0 (← links)
- 05000254/LER-1983-001, Forwards LER 83-001/03L-0 (← links)
- 05000254/LER-1994-003, Forwards LER 94-003,Rev 0 Re Not Establishing Continuous Firewatch Following Impairment of Safe Shutdown Path. Commitments Listed (← links)
- 05000254/LER-1982-025, Forwards LER 82-025/03L-0 (← links)
- 05000254/LER-1982-032, Forwards LER 82-032/03L-0 (← links)
- 05000254/LER-1982-027, Forwards LER 82-027/03L-0 (← links)
- 05000254/LER-1982-029, Forwards LER 82-029/01T-0 (← links)
- 05000254/LER-1982-031, Forwards LER 82-031/03L-0 (← links)
- 05000254/LER-1982-030, Forwards LER 82-030/03L-0 (← links)
- 05000254/LER-1982-021, Forwards LER 82-021/03L-0 (← links)
- 05000254/LER-1994-002, Forwards LER 94-002,Rev 0 Re B CR HVAC Being Inoperable Due to Failure of Compressor Motor Contactor.Hot Gas Bypass Sys for Compressor Will Be Installed to Minimize Cycling by Inducing Larger Heat Load on Compressor (← links)
- 05000254/LER-1982-012, Forwards LER 82-012/01T-0 (← links)
- 05000254/LER-1982-019, Forwards LER 82-019/03L-0 (← links)
- 05000254/LER-1982-013, Forwards LER 82-013/03L-0 (← links)
- 05000254/LER-1982-014, Forwards LER 82-014/03L-0 (← links)
- 05000254/LER-1982-015, Forwards LER 82-015/03L-0 (← links)
- 05000254/LER-1978-027, Forwards LER 78-027/03L-0 (← links)
- 05000254/LER-1983-006, Forwards LER 83-006/03L-0 (← links)
- 05000254/LER-1983-002, Forwards LER 83-002/03L-0 (← links)
- 05000254/LER-1983-005, Forwards LER 83-005/03L-0 (← links)
- 05000254/LER-1983-003, Forwards LER 83-003/03L-0 (← links)
- 05000254/LER-1983-004, Forwards LER 83-004/03L-0 (← links)
- 05000254/LER-1983-015, Forwards LER 83-015/03L-0 (← links)
- 05000254/LER-1983-014, Forwards LER 83-014/03L-0 (← links)
- 05000254/LER-1983-013, Forwards LER 83-013/03L-0 (← links)
- 05000254/LER-1982-020, Forwards LER 82-020/03L-0 (← links)
- 05000254/LER-1983-011, Forwards LER 83-011/03L-0 (← links)
- 05000254/LER-1983-007, Forwards LER 83-007/03L-0 (← links)
- 05000254/LER-1982-035, Forwards LER 82-035/03L-0 (← links)
- 05000254/LER-1982-034, Forwards LER 82-034/03L-0 (← links)
- 05000254/LER-1976-002, Updated LER 76-002/03L Re Excessive Leakage from Double Gasketed Seal X-4.Initially Reported on 760202.Caused by Equipment Failure & Insufficient Compression.Hatch Bolts Tightened (← links)
- 05000254/LER-1982-039, Forwards LER 82-039/03L-0 (← links)
- 05000254/LER-1995-004, Forwards LER 95-004.Listed Commitments Made,Including Updating Vendor Technical Manual CO099, GE Protective Relays & Accessories (← links)
- 05000254/LER-1994-016, Forwards LER 94-016,Rev 0 for Plant.Licensee Commitments Listed (← links)
- 05000254/LER-1994-015, Forwards LER 94-015-00:on 941002,single Loop Operation in Unanalyzed Condition Occurred (← links)
- 05000254/LER-1983-019, Forwards LER 83-019/03L-0 (← links)
- 05000254/LER-1996-003, Forwards LER 96-003-00 Re Unit 1 Start of Egd Due to Inadequate Procedure (← links)
- 05000254/LER-1994-004, Submits Reproduction of Original Text of LER 94-004 & Suppl Info (← links)
- 05000254/LER-1984-018, :on 840922 & 24,reactor Bldg Fuel Pool Channel B Area Radiation Monitor 1705-16B Spiked High, Tripping Ventilation.Cause Unknown.Corrective Actions for Both Events Will Be Documented in Suppl to LER 84-018 (← links)
- 05000254/LER-1996-013, Forwards LER 96-013,Rev 0 IAW Requirements of 10CFR50.73(a)(2)(i)(B).Commitments Made by Ltr,Listed (← links)
- 05000254/LER-1996-012, Forwards LER 96-012-00,for Quad Cities Nuclear Power Station.Review Plan Will Be Prepared to Identify Open Items within Component Classification Program & Ensure Resolution of Items.Plan Will Be Completed by 970301 (← links)
- 05000254/LER-1996-011, Forwards LER 96-011-00.Circuit Mods & Procedure Changes Will Be Implemented Prior to Startup & Review of Sample of Assumptions from Safe Shutdown Repts & Calculations Investigated (← links)
- 05000254/LER-1996-015, Forwards LER 96-015-00.Commits to Completion Review of All Pipe Whip & Vibration Restraint Configuations by 961231 (← links)
- 05000254/LER-1996-008, Forwards LER 96-008,Rev 00 & Makes Following Commitment: Procedure Qcts 0600-34 Will Be Revised to Ensure Appropriate Vent Path Exists When Leak Rate Testing 2251(2)-81A/B Panels (← links)
- 05000254/LER-1983-012, Forwards LER 83-012/01T-0 (← links)
- 05000254/LER-1983-010, Forwards LER 83-010/03L-0 (← links)
- 05000254/LER-1983-008, Forwards LER 83-008/03L-0 (← links)
- 05000254/LER-1997-009, Forwards LER 97-009-00 Per 10CFR50.73(a)(2)(v)(D).Commitment Included in Ltr (← links)
- 05000254/LER-1997-014, Forwards LER 97-014-00 Per 10CFR50.73(a)(2)(i)(B).Listed Commitment Made by Ltr (← links)
- 05000254/LER-1997-020, Forwards LER 97-020-00,reporting Event or Condition That Alone Could Have Prevented Fulfillment of Safety Function of Structures.No Commitments Being Made by Ltr (← links)
- 05000254/LER-1997-013, Forwards LER 97-013-00 Re Any Single Cause of Inoperable Independent Train or Channel in Single Sys Designed to Remove Residual Heat.Commitments Made by Ltr,Listed (← links)
- 05000254/LER-1997-011, Forwards LER 97-011-00 Re an Event or Condition That Alone Could Have Prevented Fulfillment of Safety Function of Structures or Sys That Are Needed to Remove Residual Heat. Commitments Made by Ltr,Submitted (← links)
- 05000254/LER-1997-010, Forwards LER 97-010-00 Which Repts Event That Occurred at Quad Cities Nuclear Station,Per 10CFR50.73(a)(2)(v)(D). Commitment Made by Ltr,Submitted (← links)
- 05000254/LER-1997-005, Forwards LER 97-005-00 IAW Requirements of 10CFR50.73(a)(2)(v)(D) W/Listed Commitments (← links)
- 05000254/LER-1997-003, Forwards LER 97-003-00 IAW 10CFR50.73(a)(2)(v)(B)(D). Procedure Qcap 0307-02, ASME Section XI Repair & Replacement Program Preparation, Attachment a, Section XI Repair/Replacement Program Will Be Revised Re VT-2 (← links)
- 05000254/LER-1997-002, Forwards LER 97-002-00 Documenting Condition That Was Discovered at Quad Cities Nuclear Power Station.Util Commitments Made within Ltr,Listed (← links)
- 05000254/LER-1997-008, Forwards LER 97-008,Rev 00 & Submits Commitments.Revised Qcop 2300-13 Is to Include Steps to Fully Disengage Turning Gear If Necessary for Testing Purposes (← links)
- 05000254/LER-1997-006, Forwards LER 97-006,Rev 00 & Submits Commitments Related to LER (← links)
- 05000254/LER-1996-021, Forwards LER 96-021-00,for Quad Cities Nuclear Power Station.No Commitments Being Made (← links)
- 05000254/LER-1996-025, Forwards LER 96-025-00 Re Operability Calculations Performed on ECCS Suction Strainers W/Incorrect Head Loss Values (← links)
- 05000254/LER-1996-023, Provides Commitments Re LER 96-023.Predefined Model Work Request Which Initiates Perodic Maint Procedure Initiated (← links)
- 05000254/LER-1996-014, Forwards LER 96-014-00.All Personnel Will Be Briefed in Event by 961215,reinforcing Expectations to Initiate Procedure Changes When Needed (← links)
- 05000254/LER-1996-017, Forwards LER 96-017-00,for Quad Cities Nuclear Power Station.Review Plan Will Be Prepared to Identify Open Items (← links)
- 05000254/LER-1996-019, Forwards LER 96-019 IAW Requirements of 10CFR50.73(a)(2)(ii)(B) & Discusses Listed Commitments (← links)
- 05000254/LER-1996-018, Forwards Supplemental Info Re LER 96-018-00,correcting Editorial Error (← links)
- 05000254/LER-1996-020, Forwards LER 96-020-00.Commitments Included in LER & Submitted (← links)
- 05000254/LER-1988-001, Sanitized Version of LER 88-001-00:on 880114,records Review Found Two Apparent Overexposures of Contractor Personnel During Fourth Quarter 1980.Caused by Inaccurate Secondary &/ or Primary Dosimetry.Dosimetry Sys Upgraded (← links)
- 05000254/LER-1997-022, Forwards LER 97-022-00,per 10CFR50.73(a)(2)(v)(D).Commitment Stating That Qcos 5750-04 Will Be Enhanced by Adding Precautions for Opening of Bypass Valve & Verification That Relief Valve Has Not Lifted & Failed to Reseat,Listed (← links)
- 05000254/LER-1997-027, Forwards LER 97-027-00,per 10CFR50.73(a)(2)(v)(D). Commitments Made by Util,Listed (← links)
- 05000254/LER-1997-029, Forwards LER 97-029-00 Per 10CFR50.73(a)(2)(i)(B). Commitments Made within Ltr Listed (← links)
- 05000254/LER-1997-024, Forwards LER 97-024-00 for Quad Cities Nuclear Power Station.Commitments Made by Ltr,Submitted (← links)
- 05000254/LER-1997-025, Forwards LER 97-025-00 Per 10CFR50.73(a)(2)(i)(B).Commitment Made by Util,Listed (← links)
- 05000254/LER-1999-001, Forwards LER 99-001-00 for Quad Cities Nuclear Power Station.Licensee Shall Rept Any Operation or Condition Prohibited by Plant Tech Specs.Util Committing to Listed Actions (← links)
- 05000254/LER-1998-011, Forwards LER 98-011-00,IAW 10CFR50.73(a)(2)(i)(B). Commitments Made within Ltr,Listed (← links)
- 05000254/LER-1987-025, Forwards Addl Info Re Control Room Habitability to Support Narrative Contained in LER 87-025 (Rev 1),including Control Room Habitability Study,Updated FSAR (Rev 88),inplace Charcoal Absorber Leak Rate Testing & Calculations (← links)
- 05000254/LER-1997-015, Informs NRC of Change of Committed Due Date Contained in LER 97-015,dtd 970812.Station Changing Due Date of Commitment to 990528 (← links)
- 05000254/LER-1989-009, Effluent & Waste Disposal Semiannual Rept,Jan-June 1989.Unit 1 Svc Water Gross Activity Monitor Out of Svc for Total of 77 Days During Reporting Period.One Unplanned Liquid Release Documented in LER 89-009 (← links)
- 05000254/LER-1999-004, Forwards LER 99-004-00,IAW Requirements of 10CFR50.73(a)(2)(i)(B).Util Is Committed to Listed Action (← links)
- 05000254/LER-1999-003, Forwards LER 99-003-00 IAW 10CFR73(a)(2)(v)(A).Commitment Made by Util,Listed.Any Other Actions Described in LER Represent Intended or Planned Actions by Licensee (← links)
- 05000254/LER-1997-019, Forwards LER 97-019-00 Re Event That Occurred at Plant,Per 10CFR50.73(a)(2)(i)(B).Commitment Made by Ltr,Listed (← links)
- 05000254/LER-1986-007, Responds to NRC Re Violations Noted in Insp Repts 50-254/87-09 & 50-265/87-09 on 870407-09.Corrective Actions: LER 86-007-00 for Unit 2 Will Be Supplemented to Describe More Fully Root Cause,Investigation & Corrective Actions (← links)
- 05000254/LER-1997-017, Forwards LER 97-017-00.Commitment Made by Ltr,Listed (← links)
- 05000254/LER-2022-003, Both Trains of Standby Gas Treatment Inoperable Due to Blockage in the Common Discharge Line (← links)
- 05000254/LER-2022-002, Low Pressure Coolant Injection Manually Isolated Due to Valve Test Equipment Issue (← links)
- 05000254/LER-2022-001, Regarding High Pressure Coolant Injection System Inoperable Due to Gland Seal System Malfunction (← links)
- 05000254/LER-2021-001, Automatic Actuation of Emergency Diesel Generator Due to Transformer Maintenance (← links)
- 05000254/LER-2020-002, Main Steam Line Drain Valve Declared Inoperable Due to Improper Torque Switch Setting (← links)
- 05000254/LER-1998-006, :on 980128,RB Post LOCA Temps Were Higher than Values Used for Environ Qualification of Electrical Equipment Due to Invalid Engineering Judgement.Cause Cannot Be Objectively Documented.Installed New TOLs (← links)
- 05000254/LER-1998-006-01, Forwards LER 98-006-01,re RB Post LOCA Temps.Actions Listed Are Required for Closure of Issue But Are Not Required Prior to Startup (← links)
- 05000254/LER-1998-012-01, :on 980227,reactor Bottom Head Drain Line Developed Leak.Caused by Inadequate Work Practice During Original Construction.Replaced Leaking Section of Drain Line Under Design Change Package(Dcp 9800100) (← links)
- 05000254/LER-1989-001-03, :on 890106,RCIC Pump Discharge Inboard Isolation Valve Failed to Open from Full Closed Position. Caused by Binding of Torque Switch on Valve Operator.Switch Replaced.Reportability Per Part 21 Possible (← links)
- 05000254/LER-1989-002, :on 890109,total of Combined Local Leak Rate Test Interval on MSIV Exceeded Specified Surveillance Interval of 18 Months.Caused by Misinterpretation of Tech Specs.Tech Specs Revised (← links)
- 05000254/LER-1998-016, :on 980411,determined That TS Scram Discharge Volume Instruments Exceeded Setpoint.Caused by Insufficient Setpoint Margin.Revised Setpoints & Implemented Addl Margin to Account for Drift (← links)
- 05000254/LER-1989-004-07, :on 890417,reactor Manually Scrammed Due to Electromagnetic Relief Valve 1-203-3D Being Stuck Open. Caused by Steam Leakage Past Pilot Valve & Obstruction of Drain Orifice.Relief & Pilot Valves Replaced (← links)
- 05000254/LER-1989-010, :on 890629,reactor Scram Occurred Due to Turbine Stop Valve Closure.Caused by Loose Connection on Condenser Low Vacuum Pressure Switch Indicating Lamp 1-5600-PS-105B.Connection Tightened (← links)
- 05000254/LER-1998-015, :on 980326,declared CREVS Inoperable.Caused by Excessive Wear to Valve Internals,Which Was Not Detected Prior to Event Due to Lack of Preventative Maint for Valve. Valve Repaired (← links)
- 05000254/LER-1989-003-07, :on 890412,manual Reactor Scram Initiated Due to Main Turbine Bypass Valves Opening.Caused by Component Failure.Circuit Board Replaced (← links)
- 05000254/LER-1989-007-05, :on 890609,refuel Floor 1A Radiation Monitor Spiked High Causing Reactor Bldg Vents & Control Room HVAC to Isolate & auto-start.Caused by Faulty Geiger Mueller Tube in Monitor.Monitor Repaired & Tested (← links)
- 05000254/LER-1989-009-02, :on 890608,discovered That Slightly Radioactive Water from Laundry Drain Tank Leaked to Laundry Sample Tank Transfer Line.Caused by Use of Wrong Matl for Day Tank Skid Drain Line Piping.Line Repaired (← links)
- 05000254/LER-1989-008-02, :on 890607,during Quarterly fail-safe Testing, Valve 1-1601-23 Would Not Fail Closed on Loss of Instrument Air.Caused by Use of Colorflow Control Valve Instead of Check Valve.Valve to Be Replaced (← links)
- 05000254/LER-1989-006-08, :on 890605,recirculation Pump Tripped Due to Operation of Wrong Breaker While Searching for Grounds. Caused by Personnel Error.Individual Counseled on Need for Correctness in Executing Procedures (← links)
- 05000254/LER-1988-011-11, :on 880625,deviation Meter on RCIC Flow Controller Found to Be Indicating Full Pump Flow While Sys Was Off.Caused by Poor Electrical Contact in Controller Plug Connection.Connector Cleaned (← links)
- 05000254/LER-1988-013, :on 880822,core Spray Room Cooler Inoperable Due to One Broken Fan Belt & One Fan Belt Off Pulley.Caused by Insufficient Preventive Maint Program.Room Cooler Fan Belts Replaced & Maint Procedure Revised (← links)
- 05000254/LER-1989-005-08, 5:on 890522,RCIC Declared Inoperable Due to Differential Pressure Indicating Switch Failure to Calibr Properly.Caused by Worn Trip Setpoint Locking Mechanism. Switch Replaced & New Switch Calibr (← links)
- 05000254/LER-1987-006-02, :on 870403,HPCI Inoperable Due to Loose Solenoid Soldered Connection.Caused by Excessive Tension on Leads of Coil & Normal Equipment Vibration.Failed Solenoid Valve Replaced & Wire Leads of Coil Lengthened (← links)
- 05000254/LER-1998-011-02, :on 980716,unqualified Circuit Card Was Installed in SD Instrument Vol Level Transmitter,Rendering It Inoperable.Caused by Personnel Error.Reviewed Event with Instrument Maint,Sys Engineering & Procurement Engineering (← links)
- 05000254/LER-1987-022-04, :on 871109,intermediate Range Monitor (IRM) 14 Spiked hi-hi Resulting in Full Reactor Scram.Caused by Faulty IRM 14 Hardware.Irm 14 Will Be Investigated & Repaired (← links)
- 05000254/LER-1998-018, :on 980627,full Reactor Scram Occurred While Performing TS Required Weekly APRM Surveillance.Caused by Spurious Trip from RPS Channel B Scram Discharge Instrument Volume Level Instrumentation.Replaced Level Transmitter (← links)
- 05000254/LER-1998-017, :on 980626,CR Emergency Air Conditioning Compressor Tripped on Loss of Cooling Water During Monthly Surveillance.Caused by Miscommunication Between Operators. Affected Equipment Attendant Counseled on Event (← links)
- 05000254/LER-1987-019-04, :on 870912,containment Leakage Determined to Be in Excess of Tech Spec 3.7.A.2.b Limit.Cause Not Determined. Investigation Will Determine Corrective Actions (← links)
- 05000254/LER-1987-016-06, :on 870912,determined That Measured Combined Leakage Rate from All Penetrations & Valves,Excluding MSIV, Exceeded Tech Spec Limits.Cause Not Yet Determined. Investigation Underway (← links)
- 05000254/LER-1987-011-07, :on 870612,embedment Plate W/Rhr Sys Pipe Support Attachments Loaded Beyond FSAR Design Limits.Caused by Improper Anchor Strap Spacing Due to Misinterpretation of Design Drawings During Fabrication (← links)
- 05000254/LER-1987-027-03, :on 871201,control Room Ventilation Isolations Occurred Due to Toxic Gas Analyzer Sample Point Selector Position Change.Caused by Lack of Procedural Guidance & Training.Signs Installed & Training Upgraded (← links)
- 05000254/LER-1987-025-03, :on 871125,control Room Habitability Design Basis Assumption Error Occurred Re Filter Efficiencies. Caused by Analysis Deficiency.Review Performed for Filters in Question (← links)
- 05000254/LER-1987-026-03, :on 871130,piping Support Located on Core Spray Discharge Line 1B Outside Compliance W/Fsar.Caused by Const Error During 1980 Mod.Excess Clearances Between Piping Lugs & Wide Flange Support Shimmed (← links)
- 05000254/LER-1997-018-01, :on 970721,determined That RHRSW Valves Associated W/Rhr Pumps Were Not Included in Monthly Valve Surveillance.Caused by Inadequate Procedure Development. Verified Valves to Be in Corrected Position (← links)
- 05000254/LER-1998-013, :on 980131,discovered Insufficient Clearance Between Core Spray Test Return Valve & Pressure Suppression Chamber.Caused by Inattention to Detail in Original Design. Removed Pad to Restore Adequate Clearance (← links)
- 05000254/LER-1999-004-03, :on 990910,CREVS Air Filtration Unit Was Declared Inoperable.Caused by Airflow Rate in Excess of TS Allowable.Airflow Was Adjusted During Performance of Surveillance Procedure Qcos 5750-02 (← links)
- 05000254/LER-1999-003-05, :on 990907,noted That HPCI Was Inoperable Due to Manual Closure of HPCI Steam Supply Isolation Valve.Cause Indeterminate.Suppl LER Will Be Issued Upon Determination of Root Cause of Control Switch Failure (← links)
- 05000254/LER-1998-010, :on 980213,TS Surveillance Interval for Snubber Visual Insp Was Exceeded.Caused by Personnel Error.Completed TS Insps & Engineering Evaluations,Verification of Correct Insp Interval Dates & Personal Accountability Actions (← links)
- 05000254/LER-1998-009, :on 980210,temp Switches Used to Perform Daily Verification Were Set Below Value Needed to Support Ts. Caused by Failure to Establish During Implementation of TS Program.Revised Procedures to Take Reading Once Per 24 H (← links)
- 05000254/LER-1998-014, :on 980306,required ASME Section XI Code Examination for Feedwater Nozzles Were Not Conducted During Second Ten Year Interval.Caused by Weakness in Processes Existing at Time for Completion.Searches Were Completed (← links)
- 05000254/LER-1997-015-02, :on 970622,discovered That 10CFRE50,App G Pressure Testing Requirements Were Not Met.Caused by Failure of Station Personnel to Recognize All Organizational Challenges Which Could Occur in Controlling.Performed Test (← links)
- 05000254/LER-1997-019-01, :on 970808,TS 3.0.C Was Entered Because No LCO Was Available for Secondary Containment When Both Doors for Interlock Were Opened Simultaneously.Verified Proper Operation (← links)
- 05000254/LER-1998-005, :on 980206,failure to Complete Visual Periodic Insp for Rc Sources Outside Primary Containment Was Noted. Caused by Ineffective Scheduling & Tracking of Sys Insp. Assigned Owner to Oversee Leak Reduction Program (← links)
- 05000254/LER-1986-029-02, :on 861002,control Room HVAC Isolated Due to False High Ammonia Concentration Signal.Caused by Broken Belt on Ammonia Analyzer.Belt Replaced & Analyzer Calibr.W/ (← links)
- 05000254/LER-1987-009-07, :on 870526,w/plant at 100% Core Thermal Power, Cable Spreading Room Sprinkler Exceeded 14-day Reporting Criteria Due to Being Out of Svc for Sys Enhancements. Similar Event Occurred on 870603.Mod Continues (← links)
- 05000254/LER-1986-028, :on 861003,RCIC Declared Inoperable Due to Closed Trip Throttle Valve.Cause Undetermined.Valve Relatched & RCIC Declared Operable.Event Considered Isolated (← links)
- 05000254/LER-1986-034-02, On 861117,discovered Severe Packing Leak on HPCI Sys Steam Supply Valve.Caused by Normal Wear on Packing Ring.Old Packing Removed & Replaced w/17 Rings of New Packing (← links)
- 05000254/LER-1986-031-02, :on 861108,diesel Generator auto-started After Incorrect Electrical Test Switch Opened During Maint.Caused by Poorly Labeled Electrical Drawings.Change Requests Submitted to Properly Identify Equipment (← links)
- 05000254/LER-1987-008-07, :on 870508,RHS Svc Water Sys Found Operating Outside of Plant Design Specs,Based on 870309 Discovery of Sheared Bolts on Concrete Expansion Anchor Plate.Cause & Repair Will Be Addressed in Supplemental Rept (← links)
- 05000254/LER-1986-026, :on 860901,full Reactor Scram Occurred During MSIV Closure Monthly Scram Sensor Functional Test Qos 250-1. Caused by Relay Block Failure.Scram Recovery Initiated. Relay Blocks Replaced (← links)
- 05000254/LER-1986-024-03, :on 860811,RHR Svc Water Supports Exceeded Allowable Stress During Safe Shutdown Earthquake Loading. Caused by Inadequate Design Control.Rhr Svc Water Supports Modified (← links)
- 05000254/LER-1986-022-02, :on 860501,containment Atmosphere Monitoring Lines Exceeded Code Stress Requirements of NUREG-0661 for Mark I Containment Design.Caused by Inadequate Drawing Design Control for Listed Mods.Lines Modified (← links)
- 05000254/LER-1986-030-02, :on 861016,turbine Bypass Valves Opened Causing Main Steam Line Low Pressure Resulting in MSIVs Isolating & Reactor Scram Signal.Caused by Personnel Error.Event Will Be Reviewed W/Instrument Maint Personnel (← links)
- 05000254/LER-1986-033-02, :on 861112,several Control Room Panels Not Anchored,Per Requirements of FSAR for Seismic Mounting. Caused by Preservice Installation Error.Brace Supports Added to Support Top of Panels (← links)
- 05000254/LER-1986-028-03, :on 861003,RCIC Turbine Trip Throttle Valve Tripped Closed & RCIC Declared Inoperable.Cause Undetermined.Valve Reset Manually (← links)
- 05000254/LER-1986-039-02, :on 861117,discovered That Primary Containment Atmosphere Greater than 4% Due to Lack of Nitrogen.Caused by Nitrogen Supplier Not Delivering Nitrogen in Timely Manner. Discussions Held W/Nitrogen Suppliers (← links)
- 05000254/LER-1986-023, :on 860505,RCIC Sys Turbine Tripped Numerous Times on Mechanical Overspeed.Caused by Mechanical Overspeed Trip Linkage Out of Adjustment.Linkage Adjusted & Partly Machined (← links)
- 05000254/LER-1986-025-03, :on 860827,certain Small Bore Torus Attached Piping Not within Allowable Operability Limits.Caused by Inadequate Design Review.Piping Support Hangers Will Be Modified (← links)
- 05000254/LER-1997-017-01, :on 970623,Unit 1 Entered 12 Hour Hot Shutdown LCO Inappropriately.Caused by Scheduling Error by Lup.Lups Were Counseled to Avoid Necessary Entry Into 12 H Hot Shutdown LCO (← links)
- 05000254/LER-1999-002-01, Forwards LER 99-002-01,IAW 10CFR50.73(a)(2)(iv).Rev Includes Cause Codes & Energy Industry Identification Sys Identifiers Which Were Erroneously Omitted in Original Ler.Commitments Listed (← links)
- 05000254/LER-1986-003, :on 860102,diesel Generator 1/2 Cooling Water Pump Discovered Inoperable Due to Removal of Circuit Breaker Control Power Fuses.Caused by Human Factors Design Error. Labeling Clarified (← links)
- 05000254/LER-1987-001-02, :on 870105,RWCU Sys Isolation Valves Closed Due to High Temp Signal.Caused by Leakage Through Check Valve in Return to Feedwater Sys.Valves Will Be Repaired During Outage of Sufficient Duration (← links)
- 05000254/LER-1987-002, :on 870107,required Hourly Fire Insp in Cable Spreading Room Not Completed.Caused by Personnel Error. Personnel Counseled Re Importance of Completing Insps.W/ (← links)
- 05000254/LER-1986-002-02, :on 860107,while Performing MSIV Local Leak Rate Tests During Shutdown for Refueling & Maint,Valves AO 1-203-2A,2B & 2C Found W/Excess Leakage.Caused by Equipment Failure.Repairs Performed (← links)
- 05000254/LER-1986-037, :on 861205,butt Splices Supplied W/Ge Penetration Assemblies Failed to Remain Intact During Qualification Testing Performed by Wyle Labs.Caused by Use of Nylon Insulation.Butt Splices Taped (← links)
- 05000254/LER-1999-001-04, :on 970715,three Spare Valves Were Determined to Require Monthly Verification in Accordance with TS SR 4.7.A.2.Caused by Inadequate Review of Procedure Rev. Surveillance Revised to Ensure to Continued Compliance (← links)
- 05000254/LER-1988-015-07, :on 881014,QA Inspector Discovered That Monthly Fire Suppression Valve Insp Not Initiated for Oct & Nov 1987.Caused by Creation of Flawed Temporary Procedure.Safety Evaluation Checklist for Procedure Implemented (← links)
- 05000254/LER-1987-004-04, :on 870302,HPCI motor-operated Valve MO-1-2301-6 Failed to Fully Close & Declared Inoperable. Caused by Normal Wear.Valve Open Limit Switch Adjusted.Valve Returned to Operation (← links)
- 05000254/LER-1986-046, :on 860414,diesel Fire Pump 1/2 a Taken Out of Svc to Protect Diver Working on 1E Traveling Screen.Pump 1/2 B Available for Fire Suppression Sys.Pump a Returned to Svc on 860422 (← links)
- 05000254/LER-1986-021, :on 860405,during Startup,Reactor Scram Occurred.Caused by Failure of Min Flow Feedwater Regulator Valve Due to Leakage Through Valve Seat.Valve Will Be Disassembled & Repaired (← links)
- 05000254/LER-1986-027-02, :on 860905,RCIC Pump Discharge to Reactor Vessel Valve 1-1301-48 Failed to Open.Caused by High Pickup Voltage on 250-volt Dc Motor Operated Valve Contactor. Voltage Changed & Valve Cycled Successfully (← links)
- 05000254/LER-1986-020, :on 860328 & 0402,during Refueling Outage, Spurious Group I Isolation Signals Received.Caused by Instrument Rack Vibration Due to Personnel Error.Personnel Reminded to Take Precautions (← links)
- 05000254/LER-1986-008-04, :on 860325,1/2 Diesel Generator Received auto- Start Signal Resulting in Diesel Generator Running Unloaded. Caused by Relay Inadvertently Contacted During Maint. Corrective Actions Unnecessary (← links)
- 05000254/LER-1997-025-01, :on 961216,failed to Calibr APRM to Flow Signal within Required Interval.Caused by Inadequate Change Mgt.Counselled Personnel Responsible for Change,Conducted Trend Investigation & Revised Procedures (← links)
- 05000254/LER-1998-007, :on 980115,design Basis of RB Superstructure Was Not in Literal Conformance W/Ufsar.Caused by Original FSAR Lacking Sufficient Detail Class I Loading Combinations. Operations Placed RB Overhead Crane OOS in Parked Position (← links)
- 05000254/LER-1986-014, :on 860312,Nov 1985 Monthly Particulate Samples for Main Chimney & Reactor Bldg Vent Sys Lost & Science Applications Intl Corp (SAI) Could Not Locate Samples.Sai No Longer Offsite Lab (← links)
- 05000254/LER-1998-004, :on 980113,RHR Shutdown Cooling Common Suction Header Was Made Inoperable Due to TS Lco.Caused by Operations & Engineering Knowledge Deficiencies & Inadequate Procedure.Defective Snubber Replaced (← links)
- 05000254/LER-1997-023-01, :on 970317,required TS Surveillance Was Not Performed Prior to Reactor Mode Change on 4 Occasions.Caused by Inadequate Procedures Associated W/Implementation of Ts. Will Incorporate Predefined Surveillance Work Requests (← links)
- 05000254/LER-1998-003, :on 971210,TS LCO Was Exceeded When SBGT Subsystem Was Inoperable Because EDGs Was Inoperable.Caused by Inadequate Procedure Development & Review.Correctly Positioned Valve & Revised Procedure (← links)
- 05000254/LER-1986-015, :on 860312,reactor Scrammed from Scram Discharge Vol Hi Level Signal & Reactor Protection Sys Bus Power Feed Transfer.Caused by Procedure Deficient in Cautioning Loss of Bypass Capability (← links)
- 05000254/LER-1998-002, :on 961007,required Drywell HP Instrument Channel Relay Monthly Surviellance Interval Was Exceeded Due to Inadequate Test Procedure.Caused by Cognitive Personnel Error.Personnel Error Reviewed W/Responsible Individuals (← links)
- 05000254/LER-1997-022-01, :on 971015,CR HVAC Sys Declared Inoperable Due to Inadequate Cooling Water Flow.Caused by Lifting of SWS Relief Valve.Revised & Reviewed Test Procedure (← links)
- 05000254/LER-1994-002-03, :on 940104,B CR HVAC Declared Inoperable. Caused by Failure in Contactor Which Resulted from Cumulative Cycling of Compressor.Contactor Replaced (← links)
- 05000254/LER-1997-027-01, :on 971218,EDGs Were Simultaneously Inoperable While Unit 1 Was at Power Due to Time Delay Relay 2 Failing to Meet Acceptance Criteria.Unit 1/2 EDG TD2 Relay Was Replaced & Tested Satisfactorily (← links)
- 05000254/LER-1986-022, :on 860501,containment Atmosphere Monitoring Sys Piping Lines Found Not Meeting NUREG-0661 Acceptance Criteria.Caused by Preservice Design Error.Action Item Record 4-85-10 Issued (← links)
- 05000254/LER-1997-029-01, :on 970316,Units 1 & 2 RBM Channel Functional Testing Were Not Accomplished within 7 Days Prior to Startup Required by TS Due to Misinterpretation of Ts.Investigation (PIF 97-3147, Nts 25420097SCAQ00088) Was Performed (← links)
- 05000254/LER-1997-024-02, :on 971201,required 10CFR50.59 Summary Evaluation for Change to UFSAR Not Submitted to NRC Due to an Administrative Oversight Error.Revised Procedure Qcap 0500-01, Processing 10CFR50.59 Ses (← links)
- 05000254/LER-1990-024, :on 901102,discovered Tech Spec Surveillance Requirement for Continuous Fire Watch Missed Due to Personnel Inattention (← links)
- 05000254/LER-1987-019-02, :on 870914,as Found Leakage Exceeded Tech Spec 3.7.A.2.b Limit.Cause Not Determined.Valves & Penetrations Tested as Required by Local Leak Rate Test Program.Several Valves & Penetration Repaired or Replaced (← links)
- 05000254/LER-1998-025, :on 981102,HPCIS Pci Check Valve Failed.Caused by Corrosion in Valve Body.Revised Check Valve Insp Procedures to Add Corrosion Repair Criteria (← links)
- 05000254/LER-1987-005-09, :on 870317,turbine Trip & Reactor Scram Occurred.Caused by Level Control Valves (LCV) Being Out of Adjustment,Stuck Valve Failure & Inadequate Planning.Program to Track LCV Setpoint Changes Developed (← links)
- 05000254/LER-1987-006-08, :on 870403,HPCI Sys Inoperable.Caused by Loose Soldered Connection on Solenoid Valve Coil SV-8.Solenoid Coil Replaced & HPCI Turbine Remote Reset Verified.Solenoid Valves SV-8 & SV-12 Replacement Planned (← links)
- 05000254/LER-1987-007-09, :on 870414,diesel Fire Pump 1/2 B Inoperable & Exceeded 7-day out-of-svc Reporting Criteria.Caused by Design Deficiency.Deficiency Repaired,Surveillance Procedures Revised & Voltage Drop Reviewed (← links)
- 05000254/LER-1987-010-08, :on 870519,control Room Ventilation Actuated Due to Toxic Gas Analyzer Failure.Caused by Design Deficiency.Nrc Not Notified Due to Miscommunication.Gas Analyzer Power Restored & Personnel Counseled (← links)
- 05000254/LER-1987-012-08, :on 870624,reactor Bldg & Control Room Ventilation Sys Isolation Occurred.Caused by Relay Coil Failure.Relay Coil Replaced & Tested & Mod M-4-1(2)-85-17 to Replace Similar Relays Initiated (← links)
- 05000254/LER-1987-013-08, :on 870629,control Room HVAC Sys Isolation Occurred.Caused by Defective Functional Test Procedure or Probe Corrosion.Chlorine in Probe Vicinity Removed & Corroded Probe Replaced (← links)
- 05000254/LER-1987-014-08, :on 870729,control Room Ventilation Isolation Occurred.Caused by Chlorine Analyzer Sys Spike Resulting from Power Fluctuation During Electrical Storm.Control Room Ventilation Sys Returned to Normal (← links)
- 05000254/LER-1987-020-06, :on 871006,refuel Floor Radiation Monitor Sys ESF Actuation Occurred.Caused by Installation Deficiency. Event Discussed W/Electrical Maint Personnel & Relay in Panels 901(2)-40 & 41 Replaced (← links)
- 05000254/LER-1987-017-08, :on 870805,HPCI Sys Inoperable Due to Invalid Sys Isolation.Caused by HPCI Steamline Differential Pressure Transmitter Failure.Transmitter Failure Under Investigation. Rosemount Model 1153DB5PA Switch Replaced (← links)
- 05000254/LER-1987-021-05, :on 871110,diesel Fire Pump 1/2A Inoperable & on 871111 7-day out-of-svc Reporting Criteria Exceeded. Caused by Pump Intake Bay Being Empty for Circulating Water Pump Maint.Intake Bay Refilled on 871117 (← links)
- 05000254/LER-1987-024-03, :on 871120,primary Containment Structural Steel Connections Outside FSAR Design Criteria Discovered.Caused by Const Error.Engineering Change Notices QC-87S-24 & 27 Issued & Repairs Made (← links)
- 05000254/LER-1987-028-03, :on 871202,open Penetrations Found Through Fire Barriers.Caused by Personnel Errors.Identified Deficiencies Repaired & Station Maint Work Request Procedure QAP 1500-2 & Checklist QAP 1500-S1 Revised (← links)
- 05000254/LER-1987-029-03, :on 871207,Bus 13-1 Degraded Voltage 5 Minute Time Delay Relay Found Out of Tolerance.Caused by Setpoint Drift.Time Delay Relay Recalibrated & Tested (← links)
- 05000254/LER-1987-030-03, :on 871219,ATWS Instrument Sensing Lines Inadequately Supported & Did Not Meet FSAR Design Criteria. Caused by Cognitive Personnel Error & Inadequate Design. Temporary Supports Installed (← links)
- 05000254/LER-1999-004-02, :on 990521,reactor Scram Occurred.Caused by Steam Intrusion Into Scram Discharge Volume.Procedure Qcop 12200-11, RWCU Sys Startup & Pump Operation, Revised (← links)
- 05000254/LER-1988-004, :on 880126,Impell Corp Notified Station That Line 1-0216-1/2 Inches Not Qualified to FSAR Criteria for Allowable Stress.Caused by Design Error.Impell Corp Developing Mod to Correct Condition (← links)
- 05000254/LER-1988-002, :on 880112,determined That Quarterly Functional Test of RCIC Sys Low Pressure Isolation Not Performed Prior to Startup.Caused by Inadequate Procedure.Procedure Checklist Used Will Be Revised (← links)
- 05000254/LER-1987-003-02, :on 870205,discovered That Flow Controller Did Not Respond to Automatic Flow Control Signals.Caused by Loose Cold Solder Joint in Setpoint Tape Chassis Section of Electronic Controller.Controller Replaced (← links)
- 05000254/LER-1998-024, :on 981022,noted That TS LCO Was Not Met When PCIV Was Made Inoperable by Maint.Caused by Improper Authorization to Start Work.Operations Completed Required Testing for 1-1601-21 PCIV on 981022 (← links)
- 05000254/LER-1998-023, :on 981008,discovered That Air Filtration Unit (Afu) Airflow & Afu Differential Pressure Exceeded TS Limits.Caused by Inaccuracy of CREVS Afu Airflow Instrument. Licensee Adjusted Afu Airflow Rate to Meet TS Requirements (← links)
- 05000254/LER-1986-017, :on 860318,several ATWS Trips Occurred.Caused by Isolated Instrument Root Valves & Open Drywell Penetration X-49 & Instrument Lines Due to Personnel Error (← links)
- 05000254/LER-1998-022, :on 980930,reactor Low Water Level Scram Occurred When Equipment OOS Disabled FW Level Control.Caused by Inadequate Review of Controlled Drawings.Heightened Risk Assessment for OOS Activities (← links)
- 05000254/LER-1998-019, :on 980917,high RP Permissive Switch to RHR Shutdown Cooling Sys Would Not Close & Would Not Calibrate. Caused by Switch Aging.Failed Switch Was Electrically Disarmed Per TS 3.2.A,Action 2 (← links)
- 05000254/LER-1998-021, :on 980918,weekly Position Verification of RB to Suppression Chamber Cv Vacuum Breakers Was Misinterpreted & Not Perfromed.Caused by Inadequate Development of Specification.Implemented Procedure Changes (← links)
- 05000254/LER-1988-008-01, :on 880408,Group I Isolation & Channal a half- Scram Occurred as Reactor Pressure Decreased.Caused by Bypass Relays Not Energized Because of Rotational Play in Mode Switch.Mode Switch Adjusted (← links)
- 05000254/LER-1988-014-07, :on 880824,HPCI Steam Line High Steam Line High Flow Setpoint Check Found Too High.Caused by Inadequate Preservice Testing.Setpoint Lowered & HPCI Operability Run Successfully (← links)
- 05000254/LER-1988-013-07, :on 880822,discovered Core Spray Room Cooler Inoperable Due to Broken Fan Belts.Caused by Insufficient Preventive Maint.Belts Replaced & Procedure Revised to Require Belt Replacement During Refuel Outages (← links)
- 05000254/LER-1987-008-01, :on 870508,RHR Svc Water Sys Operable,But Outside Plant Design Specs.Caused by Anchor Bolt Nuts Loosening in Svc While Being Subjected to Operational Vibration.Plate & Bolts Replaced (← links)
- 05000254/LER-1988-012-08, :on 880807,standby Gas Treatment Sys Flow Found Outside Tech Spec Limit.Caused by Personnel Error.Item Discussed W/Individual Involved & Instrument Mechanic Dept at Weekly Tailgate Meeting (← links)
- 05000254/LER-1987-022-01, :on 871109,full Reactor Scram Ocurred.Probably Caused by Short Circuit Developed Due to Metal Particles & Dirt Found in Intermediate Range Monitor Wiring Connectors. Connectors Cleaned & Procedures Revised (← links)
- 05000254/LER-1986-005, :on 860118,fuel Pool Radiation Monitor 1B Spiked High,Isolating Reactor Bldg Vent Sys & Starting Standby Gas Treatment Sys.Caused by Electronic Interference. Signal Cable Will Be Rerouted (← links)
- 05000254/LER-1986-004, :on 860119,reactor Scram Occurred Due to Atws/Alternate Rod Insertion Sys Initiation.Caused by Deficiency in Procedure Used to Drain Vessel.Procedure Revised (← links)
- 05000254/LER-1988-010-06, :on 880614,drywell Atmosphere Thermocouples Splices Found W/No Raychem Heat Shrink Applied & Splices Not Environmentally Qualified.Caused by Personnel Error. Splices Repaired & Training Session Conducted (← links)
- 05000254/LER-1978-028, Forwards LER 78-028/03L-0 (← links)
- 05000254/LER-1998-020, :on 980813,HPCIS Was Inoperable Due to HP Pump Thrust Bearing Oil Leak.Caused by Improper Setting of Thrust Bearing.Reviewed Maint & Training Procedure to Determine If Changes Are Needed (← links)
- 05000254/LER-1988-006-02, :on 880325,required Tech Spec Surveillance Missed.Caused by Mgt Deficiency in Providing Guidance.Task Force to Review Existing Surveillance Program & to Verify That Adequate Controls in Place (← links)
- 05000254/LER-1987-025-01, :on 871125,design Basis Assumption Used in Control Room Habitability Study in Conflict W/Tech Spec. Caused by Analysis Deficiency.Review Performed for Latest Efficiency Tests or Filters in Question (← links)
- 05000254/LER-1986-025-01, :on 860827,small Bore Torus Attached Piping Not Meeting FSAR Requirements Discovered.Caused by Inadequate Design Review.Mod Issued to Correct Remaining Mark I Issues for Small Bore Piping (← links)
- 05000254/LER-1988-009-06, :on 880608,HPCI Sys Declared Inoperable When Oil Pump Motor Breaker Turned Off Due to Smoke Odor.Odor Determined Not to Be Coming from Pump Motor.Training Lesson Plans Revised to Provide Info Re Motor Heaters (← links)
- 05000254/LER-1978-030-03, /03L-0 on 781026:dual Position Indication Was Received for Supression Chamber to Drywell Vacuum Breaker, Valve 1-1601-33E.Caused by Position Indication Problem (← links)
- 05000254/LER-1988-003-01, :on 880125,valve Mo 1-1301-48 Failed to Open During Testing.Caused by Electrical Equipment Being Out of Adjustment.Torque Switch Bypass Adjusted Under Work Request Q63784 Using New Criteria (← links)
- 05000254/LER-1987-018, :on 870913,recirculation Motor Generator 1B Failed to Trip.Caused by Burnt Out Trip Coil.Breaker Sent to GE Facility for Testing,Various Components Replaced & Breaker Reinstalled (← links)
- 05000254/LER-1987-033-03, :on 871226,inadvertent Control Rod Scram Occurred When Control Rod H-9 (30-35) Scrammed Per Procedure.Caused by Personnel Error.Control Rod Returned to Prescram Position & Procedure Revised (← links)
- 05000254/LER-1987-032-03, :on 871223,discovered That RCIC Pump Would Not Inject Water Into Reactor Vessel.Caused by RCIC Pump Discharge Check Valve Failing to Open.Check Valve Disassembled,Repaired,Reassembled & Tested (← links)
- 05000254/LER-1987-026, :on 871228,discovered That Two Piping Supports Located on RCIC Suction Line Failed to Comply W/Fsar Criteria for Allowable Stress.Caused by Const/Design Error. Excess Clearances Between Piping Shimmed (← links)
- 05000254/LER-1987-031-03, :on 871223,while Performing Valve Operability Test on HPCI Sys,Hpci Declared Inoperable.Caused by Mgt Failure to Ensure Instrument Sensing Lines Backfilled.Task Added (← links)
- 05000254/LER-1987-023-04, :on 871111,low Fire Protection Header Pressure Automatic Start Signal Did Not Start Diesel Pump During Low Pressure Condition.Caused by Corrosion on Some Engine Start Relay Contacts.Loose Wire at Regulator Tightened (← links)
- 05000254/LER-1997-004-03, :on 961026,RHR Svc Water Pumps Declared Inoperable Due to Inadequate Evaluation of Replacement Pump Casing Bolts.Rhrsw Pump Bolting Inspected & Questionable Bolting Replaced (← links)
- 05000254/LER-1988-005, :on 880201,control Room Ventilation Isolation Occurred.Caused by Personnel Error.Personnel Retrained & Chlorine Monitor Probe Replaced & Tested Satisfactorily (← links)
- 05000254/LER-1986-009-01, :on 860211,scram Occurred from Scram Discharge Instrument Vol High Level.Caused by Personnel Error Due to Inadequate Awareness of Sys Status.Crd Scram Valves Will Be Checked for Leakage During Startup (← links)
- 05000254/LER-1986-010, :on 860211,Group II & III Isolations Occurred, During Hfa Relay Replacement.Caused by Personnel Error.Work Packages for Future Hfa Relay Replacements Will Be Written to Prevent Recurrence (← links)
- 05000254/LER-1997-009-03, :on 970504,both Trains of Standby Gas Treatment Sys Were Inoperable.Caused by Cognitive Peersonnel Error. Blown Fuse Replaced,A Train of SBGTS Was Tested & Declared Operable & SRO Test Director Counseled (← links)
- 05000254/LER-1997-014-01, :on 970416,target Rock Safety Relief Valve Removed from Unit 2 During Q2R13 & Unit 1 During Q1R14 Were Not Tested within 12 Months.Caused by Defective Procedure. Revised Maintenance Procedure (← links)
- 05000254/LER-1986-019, :on 860317,ATWS/alternate Rod Insertion Trip Occurred.Caused by Scaffolding,Erected to Install Fire Protection Mods,In Contact W/Instrument Sensing Lines. Scaffolding Rearranged (← links)
- 05000254/LER-1986-018, :on 860320,reactor Protection Sys Channel B Tripped,Resulting in Full Scram.Caused by Spiking of Intermediate Range Monitors 15 & 18.Monitor 15 Cable Replaced & Monitor 18 Will Be Replaced (← links)
- 05000254/LER-1986-016, :on 860317,following Core Spray Logic Functional Test Qms 700-5,diesel Generator auto-started & Ran Unloaded.Caused by Inadvertent Contact W/Sensitive Relays.Corrective Action Unnecessary (← links)
- 05000254/LER-1986-013, :on 860310,ATWS Trip Received.Caused by Valving Error by Instrument Mechanics Performing Test Due to Inadequate Communications Between Mechanics.Drain Valve Tags on Instrument Rack Will Be Replaced (← links)
- 05000254/LER-1986-006, :on 860122,reactor Bldg Ventilation Sys Isolation Occurred as Result of Spurious Trip of Reactor Bldg Ventilation Monitor 1B.Caused When Disconnected Signal Cable Resulted in Spike (← links)
- 05000254/LER-1997-020-01, :on 970519,B-train Control Room Ventilation Sys Became Inoperable When AHU Breaker Tripped When Performing Monthly Surveillance.Cause Could Not Be Determined.Circuitry Testing Completed (← links)
- 05000254/LER-1997-013-01, :on 970416,RCIC Area High Temperature Switch Would Not Actuate Due to Excess Sealing Varnish Applied by Technician.Caused by Personnel Error.Removed Excess Varnish from Switch,Calibrated & Functionally Tested Switch (← links)
- 05000254/LER-1997-011-01, :on 970409,RHRSW Sys Was Made Inoperable Due to Uncertainties Related to 4 Kv Air magne-blast Horizontal Gas Circuit Breakers.Caused by Improper Manufacturers Switch Mounting Design.Pif 97-1276 Written to Investigate Cause (← links)
- 05000254/LER-1997-010-02, :on 970407,train B of Control Room HVAC Sys Was Inoperable Due to Loss of Refrigerant.Caused by Failed Fitting.Replaced Fitting & Sys Tested Satisfactorily (← links)
- 05000254/LER-1985-022-08, :on 851228,air Flow to Train a of Standby Gas Treatment Sys Dropped to Zero & Train B Failed to Start. Caused by Plastic Bag Over Intake Screen of Train a & Blown Fuse in Train B Timer Mechanism (← links)
- 05000254/LER-1997-005-03, :on 970319,HPCI Subsystem Was Made Inoperable to Protect Equipment Due to Uncertainties Re Abandoned Power Feed Cable,Which Had Been Inappropriately Abandoned. Plant Design Documents Have Been Updated (← links)
- 05000254/LER-1986-012, :on 860221,standby Gas Treatment Sys a Started & Reactor Bldg Ventilation Sys Isolated.Caused by Disconnected Power Supplier for Fuel Pool & Reactor Bldg Ventilation Monitor 1B.Personnel Cautioned (← links)
- 05000254/LER-1986-011, :on 860214,discovered That Undervoltage Relay in Position AB on Bus 13-1 Tripped at 2,870 Volts Ac Below Limit.Caused by Instrument Setpoint Drift.Relay Recalibr (← links)
- 05000254/LER-1997-003-05, :on 970429,visual Exam (VT-2) Was Not Performed Due to Procedural Deficiencies Following HPCI Sys Valve Replacement Required by Asme,Section XI & TS Section 4.0.E. Examined VT-2 of 1-2301-45 Valve (← links)
- 05000254/LER-1997-002-02, :on 970127,several Isolable Piping Sections Could Experience Stresses Above Update FSAR Allowables Due to post-loss of Coolant Accident Thermal Pressurization. Initial Operability Evaluation Was Completed on 970124 (← links)
- 05000254/LER-1985-018-08, :on 851120,while Shutdown in Refuel Mode, Several Discrepancies Identified in Station Fire Protection Program.Caused by Mgt Deficiency.Plastic Shields Installed Over Switch Gear to Avoid Water Damage (← links)
- 05000254/LER-1997-008-01, :on 970402,high Pressure Coolant Injection Was Inoperable Due to Turning Gear Failure.Turbine Turning Gear Was Manually Engaged (← links)
- 05000254/LER-1997-006-03, :on 970327,loss of Reactor Coolant Inventory in Excess of Design Basis Limits Occurred Due to Inadequate Procedural Guidance.Procedure Qcop 1200-07 Was Revised to Administratively Control Power Feed Breaker (← links)
- 05000254/LER-1997-007-03, :on 970331,unit One Emergency DG Inadvertently Started Due to Error by RSO While Operating Control Switch. Nso Removed from All Licensed Duties Until Completion of Remediation Plan (← links)
- 05000254/LER-1996-022-01, Extends Commitment Date for Completing Rev to Plant CR Dose Analysis of Record,Per LER 96-022-01 (← links)
- 05000254/LER-1986-007-01, :on 860203 & 13,phase a Differential Current Relay on Bus 13-1 Tripped & Actuated Lockout Relay.Probably Caused by Spurious Actuation Due to Vibration.Mod Initiated to Replace Relays W/Relays Less Sensitive (← links)
- 05000254/LER-1985-015-08, :on 850830,RCIC Turbine Overspeed & Turbine Trip Alarms Received.Caused by Corrosion on Leads to Overspeed Relay Lamp.Leads to Relay Lamp Cleaned & Reconnected & RCIC Alarm Reset (← links)
- 05000254/LER-1986-001-02, :on 860106,during Shutdown,Discovered That Measured Combined Leakage Rate for All Penetrations & Valves Except MSIVs in Excess of 293.75 Scfh.Cause Undetermined. Corrective Action Delayed Until Rept Completed (← links)
- 05000254/LER-1986-002, :on 860107,during Shutdown,Discovered That Three MSIVs Leaked in Excess of 11.5 Scfh Limit.Cause Undetermined.Leaks Will Be Repaired Before Startup (← links)
- 05000254/LER-1985-020-07, :on 851210,auto-start Signal Sent to Standby Gas Treatment Sys Due to Bypass of Fuel Pool Radiation Monitor 1A & Downscale Spike of Monitor 1B.Caused by Electronic Interference.Cable Rerouted (← links)
- 05000254/LER-1985-009-09, :on 850725,broken Fan Belt on Room Cooler for RHR Pumps C & D Discovered.Caused by Component Failure.Belt Replaced & Fan Housing Adjustments Made (← links)
- 05000254/LER-1985-019-08, :on 851125,RHR Svc Water Pump 1D Out of Svc Due to Tech Spec Flow Requirements.Caused by Pieces of Wood Lodged in Impellers of Pump.Pump Disassembled & Wood Removed (← links)
- 05000254/LER-1985-097, :on 851125,diesel Fire Pump B Out of Svc for Repair Greater than 7 Days.Caused by Rings Worn to Point That Tolerances Out of Spec.Pump Overhauled & Wear Rings Replaced (← links)
- 05000254/LER-1985-017-08, :on 851015,RCIC Pump Discharge Valve Mo 1-1301-48 Would Not Open from Control Room After Closure. Caused by Dirty Main Contactor in Breaker.Main Contactor Will Be Cleaned But Not Lubricated in Future (← links)
- 05000254/LER-1985-021-08, :on 851213,during Performance of Qos 1300-2, RCIC Pump Operability Test, Control Room Flow Indicator Discovered Not Responding.Caused by Failed Fuse.Fuse Replaced (← links)
- 05000254/LER-1985-011-08, :on 850802 & 04,high RCIC Exhaust Pressure & RCIC Turbine Trip Alarms Annunciated.Caused by Water Dripping on Barksdale Pressure Switch.Switch Replaced & Hose Repositioned (← links)
- 05000254/LER-1985-010-08, :on 850728,RCIC Declared Inoperable After RCIC Bn Turbine Overspeed & Turbine Trip Alarms Received.Caused by Failed RCIC Overspeed Meter Relay Light Bulb.Light Bulb Replaced (← links)
- 05000254/LER-1984-011-08, :on 840615,bus 13-1 Tripped Causing Channel a half-scram.Caused by Personnel Error.Power Restored to Channel B from Bus 19 & Channel a from Bus 15 (← links)
- 05000254/LER-1984-012-07, :on 840802,reactor Bldg Vent Sys Isolated, Standby Gas Treatment Sys Train B auto-started & Sys Heater Tripped.Caused by Incorrect Electrical Wiring.Wiring Diagrams Being Corrected (← links)
- 05000254/LER-1996-021-01, :on 961011,B CR HVAC Sys Was Declared Inoperable Due to Crankcase Heater Power Supply Design Deficiency.Design Change Notice 9600380 Issued,Which Replaced Crankcase Heater W/Safety Related Heater (← links)
- 05000254/LER-1997-001, :on 970117 & 07,discovered TS Required,Once Per Shift Channel Check Readings Not Completed within Required Twelve H Time Interval Plus 25% Max Allowable Extension. Caused by Personnel Error.Readings Performed (← links)
- 05000254/LER-1992-020, :on 920920,determined That TS 3.7.A.2.a.2 Limit Exceeded While Performing LLRT of Atmospheric Containment,Atmospheric Dilution & SGTR Isolation Valve. Caused by Bonnet Leak.Valve Flushed (← links)
- 05000254/LER-1996-025-01, :on 961220,discovered Original Value for Strainers Head Loss Incorrect.Cause Could Not Be Determined. Training Provided for Operators to Recognize Pump Cavitation During Design Basis Accidents (← links)
- 05000254/LER-1985-016-08, :on 850905,reactor Bldg Ventilation Isolated & Standby Gas Treatment Initiated Following Spurious High Alarm & Fuel Pool Radiation Monitor Trip.Probably Caused by Electrical Noise Interference to Monitor Cable (← links)
- 05000254/LER-1996-023-01, :on 961124,CR Emergency Filtration Sys Failed to Maintain Required Airflow Due to Cognitive Personnel Error.Instrument Loop for Gauge Fi 1/2-5795-307 Calibr (← links)
- 05000254/LER-1985-008-08, :on 850617,high Level Alarm Received from 1B/1C RHR Svc Water Vault Sump.Caused by Broken Vent Line on 1C RHR Svc Water Pump W/Vault Partially Filled W/Water.Pump Repaired & Returned to Svc (← links)
- 05000254/LER-1996-014-03, :on 960927,electrical Distribution Weekly Surveillance Did Not Document Voltage Verification Due to an Inadequate Procedure.Qcos 0005-06 Has Been Revised to Ensure Verification of Proper Voltages (← links)
- 05000254/LER-1985-014, :on 850403,at 100% Rated Core Thermal power,1A Fuel Pool Radiation Monitor Spiked Upscale Energizing Fuel Pool Channel a High Radiation Alarm.Probably Caused by Loose Capacitor & Open Light Emitting Diode (← links)
- 05000254/LER-1996-017-01, :on 960825,manual Scram Taken During Reactor Startup When Reactor Water Level Increased Following Unplanned Opening of All Main Turbine Bypass Valves Occurred,Due to Inadequate Procedures.Procedures Revised (← links)
- 05000254/LER-1996-018-01, :on 960903,TS Surveillance Requirements Were Misinterpreted Due to Conservative Misunderstanding of Requirement.Memo Was Written to Explain Which Min TS Surveillances Must Be Performed Re Mode Switch (← links)
- 05000254/LER-1996-016-01, :on 960823,secondary Containment Would Not Have Satisfied All UFSAR Requirements,Due to Siding Explosion Bolts Which Were Damaged by Either High Winds or Ineffective Work Pratices.Damaged Bolts Replaced (← links)
- 05000254/LER-1996-019-01, :on 960904,main Steam Line Radiation Monitor Functional Test Was Not Performed within Frequency Established for TS When in Refueling Mode Due to Incomplete Documentation of TS Interpretation.Qcap 2300-11 Was Changed (← links)
- 05000254/LER-1996-020-01, :on 960907,CR Emergency Filtration Sys Declared Inoperable.Caused by Operator Knowledge Weakness.Operators Declared CR Emergency Filtration Sys Inoperable & Entered 14-day LCO (← links)
- 05000254/LER-1985-006-08, :on 850530,reactor Scrammed Twice Due to Group I Isolation from Rack Vibration.Second Event Caused by Low Reactor Water Level.First Event Caused by Spurious Isolation Signal from Pressure Switches (← links)
- 05000254/LER-1985-007-08, :on 850531,fuel Pool Radiation Monitor 1A Failed Upscale,Tripping Reactor Bldg Ventilation & Starting Standby Gas Treatment Sys.Caused by Defective GE Sensor Converter,Model 194X927G16.Converter Replaced (← links)
- 05000254/LER-1986-032, :on 861108,1/2 DG Feed Breaker to Bus 13-1 Tripped,Causing Loss of Power to Bus 13-1 & RPS Bus A.Caused by Trip of Underexcitation Relay.Work Request Q50657 Written to Calibrate Underexcitation Relay (← links)
- 05000254/LER-1992-026-02, :on 921027,discovered That RCIC Flow Transmitter Out of Calibr,Resulting in Pump Flow Below TS Requirements.Caused by Setpoint Drift.Calibr of Flow Transmitter Verified (← links)
- 05000254/LER-1985-005, :on 850307,monitors 1A & 1B Spiked High.On 850306,fuel Pool Radiation Monitor 1A Failed Downscale.On 850308-10 & 12-14,monitor 1A Spiked High.On 850315,monitor 1B out-of-bypass Occurred.Caused by Capacitor (← links)
- 05000254/LER-1985-003-09, :on 850517,Group II Isolation Signal Received, Standby Gas Treatment Sys a Failed to Start & Heater Breaker Tripped.Caused by Incomplete design,auto-start Relay & Breaker Wiring,Respectively.Breaker Reset (← links)
- 05000254/LER-1992-032-01, :on 921221,review of Deviation Rept 04-01-92-124 Determined That Administrative Requirements & Commitments for Fire Protection Not Met.Caused by Mgt Deficiency.Fire Protection Programs Reviewed (← links)
- 05000254/LER-1992-030-01, :on 921213,reactor Recirculation Pump 1B Tripped Due to Inadequate Relay Logic Blocks Associated W/ Temporary Procedure.Caused by Inadequate Communications.Test Suspended & Procedure Will Be Revised (← links)
- 05000254/LER-1985-002-07, :on 850509,while Performing Traversing in-core Probe Sys Power Operated Valve Testing,Number 4 TIP Ball Valve Failed to Close.Caused by Loss of Lubrication.Valve Lubricated & Returned to Svc (← links)
- 05000254/LER-1983-009-03, /03L-0:on 830222,differential Pressure Indicating Switch 1-1360-1A Failed to Trip in Negative Direction.Caused by Drift of Instrument Setpoint Above Physical Stops.Switch Recalibr & Tested Satisfactorily (← links)
- 05000254/LER-1992-029-01, :on 921029,high Radiation Area Posting Concealed from View & Barrier Eliminated Due to Workers Neglecting to Close Door.Swing Gates Ordered for Placement at Specific High Radiation Area Entrances (← links)
- 05000254/LER-1992-021-02, :on 920825,governor Instabilities Noted by Operator.Caused by Air Trapped in Governor Compensation Sys. Governor Compensators Vented & Readjusted & Governor Sys Returned to Svc (← links)
- 05000254/LER-1991-022, :on 911104,CR Train B Air Filtration Unit Declared Inoperable Due to Failing to Attain 15 F Differential Temp.Caused by Inaccurate Flow Measuring Device.Flow Measuring Device Recalibr (← links)
- 05000254/LER-1992-019-02, :on 920815,emergency Load Drop Initiated Due to Unisolable Electrohydraulic Control Unit Fluid Leak, Resulting in Automatic Reactor Scram.Caused by Insufficient Operator Training.Training Will Be Provided (← links)
- 05000254/LER-1996-013-01, :on 960808,zebra Mussels Were Discovered on Fire Pump Suction Strainers.Caused by Inadequate Insp Frequency of Fire Pump Suction Strainers.Divers Removed & Cleaned Zebra Mussels from Fire Pump Suction Strainers (← links)
- 05000254/LER-1996-012-02, :on 960620,diesel Fuel Oil Transfer Piping Noted in Unanalysed Condition Due to an Incomplete Safety Classification Upgrade.Minor Mod Has Been Completed Which Removes Autofill Capability for Fire Pump Day Tanks (← links)
- 05000254/LER-1985-014-03, :on 850403,fuel Pool Radiation Monitor 1A Spiked High.Caused by Electrical Noise Interference.Monitor Reset (← links)
- 05000254/LER-1985-013-03, :on 850329,Train B Standby Gas Treatment Sys Started W/O Apparent Start Signal.Reactor Bldg Ventilation & Control Room Ventilation Sys Tripped.Caused by Relay 2-1701-100B Coil Failure.Relay Replaced (← links)
- 05000254/LER-1985-012-03, :on 850327,0418 & 19,fuel Pool Radiation Monitors 1A & 1B Spiked Upscale,Energizing Fuel Pool High Radiation Alarms.Caused by Loose Capacitor in Radiation Monitor Sensor Unit.Connection Repaired (← links)
- 05000254/LER-1996-011-02, :on 960708,determined Postulated Fire Could Have Caused Disabling Damage to Selected Motor Operated Valves.Caused by Inadequate Design Analysis Review.Movs Analyzed for Susceptibility to Single Failure (← links)
- 05000254/LER-1992-028-01, :on 921016,during Review of SBGT TS Rev, Discovered That on Loss of Instrument Air CR Dose Would Exceed GDC-19 Limit.Caused by Inadequate Design.Several Operating Procedures Temporarily Revised (← links)
- 05000254/LER-1992-027-01, :on 921009,insp of HPCI Room Cooler Determined That Room Cooler Fouled Beyond Design Margin Due to Accumulation of Sediment & Debris.Working Group Directed to Clean Room Cooler (← links)
- 05000254/LER-1985-005-08, :on 850306,fuel Pool Radiation Monitor 1A Failed Downscale.On 850307,monitor 1B Spiked High & Monitor 1A Spiked High 13 Times.Caused by Electrical Noise Interference (← links)
- 05000254/LER-1992-025-01, :on 921002,control Room HVAC Toxic Gas Analyzer Declared Inoperable Due to Broken Sample Pump Belt.Belt Replaced & Qis 79-4, Ammonia Analyzer Functional Test Procedure, Revised (← links)
- 05000254/LER-1992-024-02, :on 920923,discovered That Valve 1-1601-23, Drywell Vent Valve Closed Due to Personnel Error.Licensee Plans to Make Changes to Scaffolding Construction Process.W/ (← links)
- 05000254/LER-1992-023-01, :on 920920,determined That Heat Transfer Capability of 1B & 2B HX Did Not Meet Design Requirements. Caused by Fouling & Silt Accumulation on Rhrsw.Routine Two Pump Flushing Will Be Performed (← links)
- 05000254/LER-1996-010-02, :on 960611,discovered Installed Gallery Steel Configuration Lacked Required Cross Bracing.Caused by Deficiency in Original Design Configuration Control Process. Installed Gallery Cross Bracing (← links)
- 05000254/LER-1992-020-02, :on 920921,determined That TS 3.7.A.2.a.2 Limit of 293.75 Scfh Exceeded.Cause of Excessive Leakages Cannot Be Determined Until Repairs Completed & Valves & Components Retested.Supplemental LER Will Be Issued (← links)
- 05000254/LER-1996-015-01, :on 960816,HPCI Sys Jet Impingement Support Baseplate/Concrete Expansion Anchors Were Improperly Installed,Due to Ineffective Work Practices & QA Program. Review Will Be Completed (← links)
- 05000254/LER-1996-008-02, :on 960607,TS Required Pressure Not Met During Local Leak Rate Testing.Caused by Procedural Deficiency. Procedure Changes Submitted & Check Valves Retested Using Appropriate Vent Paths (← links)
- 05000254/LER-1996-009-01, :on 960523,noted Discrepancy in Cable Length Modeled in Existing Degraded Voltage Calculations.Caused by Design Analysis Deficiency.Performed Design Changes to Correct Voltage Problems (← links)
- 05000254/LER-1996-005-07, :on 960203,B CR HVAC Sys Declared Inoperable Due to Outside Air Temp.Submitted TS Change Requesting That Heater Power Be Measured Instead of Differential Temp Across Heater to Determine Operability (← links)
- 05000254/LER-1996-007-02, :on 960510,secondary Containment Damaged.Caused by Tornado.Initiated Shutdown,Ac Power Restored to Prompt Notification Sys & Station Blackout Bldg Cables Spliced Per Er 9603099 (← links)
- 05000254/LER-1991-003-02, Forwards LER 91-003-02.Containment Atmosphere Monitoring Piping & Mark I Support Installation Work Will Be Completed Prior to Startup from Current Forced Outage Q2F41 (← links)
- 05000254/LER-1984-018-02, :on 840922,reactor Bldg Fuel Pool Channel B Area Radiation Monitor 1705-16B Spiked to 200 Mr/H,Tripping Ventilation & Starting Standby Gas Treatment Sys.Cause Not Determined.No Corrective Action Taken (← links)
- 05000254/LER-1992-018-02, :on 920811,declared Toxic Gas Analyzer Inoperable Due to Failure of Local Control Unit (Lcu) in Control Circuitry & Poor Electrical Connections.Lcu Replaced & Poor Electrical Connections Repaired (← links)
- 05000254/LER-1992-017-02, :on 920804,B Train of CR HVAC Refrigeration Condensing Unit Declared Inoperable Due to Incorrect Compresser Operating Instructions.Vendor Manual to Be Revised (← links)
- 05000254/LER-1992-013-03, :on 920609,power Lost to Bus 19 Resulted in Failure of ESF Signal to Start.Caused by Design Deficiency. Licensee Intends to Change Lineup of Standby Gas Treatment Sys (← links)
- 05000254/LER-1989-014, :on 890910,determined That Measured,Combined Leakage Rate from All Penetrations & Valves,Excluding Misvs, Exceeded TS Limits.On 890911,MSIV Leaked in Excess of Ts. Valve Seating Surfaces Machined & Lapped (← links)
- 05000254/LER-1996-001-07, :on 960303,B CR HVAC Sys Inoperable Due to Malfunctioning Relay Which Prevented Isolation of Air Handling Unit Fan.Ems Replaced Relay & Forwarded Damaged Relay to Engineering for Evaluation (← links)
- 05000254/LER-1992-011-03, :on 920530,Unit 1 in Shutdown Mode Performing Cooldown to Cold Condition for Maint Outage.Caused by Procedural Inadequacy.Cooldown Rate Minimized & Thermocouple Replaced (← links)
- 05000254/LER-1987-016, :on 870912,determined That Measured Combined Leakage Rate from All Penetrations & Valves Exceeded TS Limit of 293.75 Scfh.Caused by Rust on Valves & Valve Stuck Open.Gates Valves Will Be Replaced (← links)
- 05000254/LER-1996-003-02, :on 960222,unanticipated Start Occurred on Unit 1 Edg.Caused by Inadequate Guidance within Procedure Qcmms 6600-03.Procedure Qcmms 6600-03 Will Be Revised to Clarify Switch Settings (← links)
- 05000254/LER-1996-002-04, :on 960220,CR HVAC Sys Inoperable.Caused by Design Oversight Involving Toxic Gas Anlayzer.On 960223 Procedure Change to Qcop 5750-09, CR Ventilation Sys, Made to Allow for Operation of Booster Fans (← links)
- 05000254/LER-1996-006, :on 960210,TS 3.0.A Incorrectly Invoked Due to Procedural & Operator Knowledge Deficiencies.Policy Statement Developed & Presented to Licensed Operator Re Expectations for Use & Entry Into TS 3.0.A (← links)
- 05000254/LER-1990-035, :on 901213,1A Core Spray Room Floor Drain Plug Removed.Caused by Personnel Error.Sf to Stay in Area & Ensure Reinstallation of Floor Drain Plug (← links)
- 05000254/LER-1992-002-04, :on 920206,Unit 1 Pressure Coolant Injection Sys Was Declared Inoperable.Caused by Inadequate Work Instructions.Unit 1 Stop Valve & Poppet Guide Will Be Repaired (← links)
- 05000254/LER-1991-039-01, :on 910424,RCIC 1301-49 Pump Discharge Valve Failed to Open.Cause Is Unknown.Valve Disk Manually Cracked Off Seat & Valve Stroked Afterwards (← links)
- 05000254/LER-1996-004-01, :on 960130,HPCI Sys Declared Inoperable Due to Gland Exhauster Breaker Trip.Hpci Gland Exhauster Breaker Replaced & Tested for Proper Operation & AOP Time Delay Bypass Switches in Starting Circuit Replaced (← links)
- 05000254/LER-1985-005-07, :on 850306,at 100% Thermal Power Operation, Fuel Pool Radiation Monitor 1A Failed Downscale.On 850307, Monitors 1B & 1A Spiked High.Probably Caused by Electrical Noise Interference.Mod Issued (← links)
- 05000254/LER-1985-009-02, :on 850203,temp Recorder Inoperable.Caused by Temp Recorder Being Out of Calibr.Temp Recorder Recalibr & Returned to Svc (← links)
- 05000254/LER-1985-001-08, :on 850205,during HPCI Pump Operability Test,Hpci Turbine Could Not Be Reset from Control Room. Caused by Failure of HPCI Turbine Trip & Reset Solenoid Valves of HPCI Stop Valve.Valves Repaired (← links)
- 05000254/LER-1992-016-04, :on 920626,discovered That Valve 1-4199-72 Not Verified Locked Open within TS Surveillance Interval.Caused by Personnel Error.Procedure Changed to Permit Verification of Hard to Reach Valves W/Flow Test (← links)
- 05000254/LER-1984-015-05, :on 840825,turbine Bypass Valves Cycled Opened & Closed,Creating Pressure Spike Which Collapsed Voids in Vessel.Reactor Protection Sys Tripped Due to High Neutron Flux.Caused by Dirty Contacts (← links)
- 05000254/LER-1984-002, :on 840307,while Performing Refueling Outage Local Leak Rate Testing,Measured Combined Leakage Rate for All Penetrations & Valves Found in Excess of Tech Specs. Valves,Hatches & Penetrations Repaired (← links)
- 05000254/LER-1992-014-02, :on 920424,determined That LPCI Valves Would Not Open During Degraded Voltage Condition Due to Improper Setting of Trip Setpoints.Caused by Design Error.Valve Contactors Replaced (← links)
- 05000254/LER-1992-012-03, :on 920415,Main Chimney High Range Noble Gas Monitor Was Declared Inoperable Due to Mgt Deficiency in Prioritizing & Scheduling Work.Im Technician Replaced I/O Board for Subj Monitor (← links)
- 05000254/LER-1984-017-03, :on 840816,mechanical Vacuum Pump Began Tripping Due to High Temp.Caused by Installation of South Steam Jet Air Ejector Suction Valves 90 Degrees Out of Proper Orientation (← links)
- 05000254/LER-1984-013-04, :on 840808,new Vessel Level Instrument Line Improperly Backflushed,Resulting in Reactor Scram & ECCS Initiation from False Signal.Caused by Personnel Error.Level Instrumentation Lines Flushed & Backfilled (← links)
- 05000254/LER-1984-004-01, :on 840316,MSIV Failed Local Leak Rate Test. Caused by Valve Seating Surface Wear & High Pressure Steam Flowing Through Sys During Operation on Valve AO 1-203-1B. New Pilot Seat Installed (← links)
- 05000254/LER-1992-015, :on 920427,discovered LPCI & Core Spray Valve Yokes Outside FSAR Design Basis During Vessel Blowdown to Torus.Caused by Inadequate Design Control.Valve Yokes Replaced (← links)
- 05000254/LER-1984-007, :on 840507,RHR Svc Water Vault Penetrations Found to Leak.Cause Unknown.Rhr Svc Water Vault Sump Pump Discharge Penetrations & Motor Electrical Feed Penetrations a & C Tightened & Satisfactorily Tested (← links)
- 05000254/LER-1984-005-02, :on 840414,insps Revealed Several Welds W/ Circumferential &/Or Axial Linear Indications & Areas W/ Small Cracks.Caused by Igscc.Welds Repaired (← links)
- 05000254/LER-1992-010-03, :on 920407,loss of 125 Volt Dc Turbine Bldg Bus 1A & 1A-2 Occurred.Caused by Personnel Error.Plexiglass Covers Placed Over Disconnects Until Work Completed (← links)
- 05000254/LER-1995-008-08, :on 951206,HPCIS Declared Inoperable When HPCI Turbine Stop Valve Failed to Open within Acceptable Range of IST Program Due to Loose Connections & Fouled Limit Switch Contacts.Request for PM Initiated (← links)
- 05000254/LER-1992-009-02, :on 920401,discovered That Radwaste Radiation Monitor & Steam Jet Air Ejector Radiation Monitor Did Not Meet Functional Requirements of TS Table 4.2-3.Caused by Inadequate Procedure.Procedure Changed (← links)
- 05000254/LER-1984-014-04, :on 840808,while Starting Shutdown Cooling Mode of RHR Sys,Lpci Valves 1-1001-29A & B Would Not Open. Caused by Personnel Error.Valve Stems Removed & Being Replaced (← links)
- 05000254/LER-1995-006-08, :on 951103,TS Surveillance Was Missed Due to Procedure Deficiency.Enhanced Procedure Qcop 500-1 to More Accurately Define RPS EPA Operability (← links)
- 05000254/LER-1995-007-07, :on 951020,CRD Scram Discharge Vol Control Logic Failed to Meet Single Failure Criteria.Caused by Design Deficiency.Pif 95-2685 Written to Investigate Cause of Design Deficiency (← links)
- 05000254/LER-1991-025-01, :on 911211,reactor Scram Occurred Due to Turbine Stop Valve Closure.Caused by Misaligment of 1A FW Regulating Valve Causing Valve to bind.1A FW Regulating Valve Diassembled & Repaired (← links)
- 05000254/LER-1984-016-04, :on 840828,group 1 Isolation & Automatic Reactor Scram Occurred.Caused by Spurious Main Steam Line High Flow Signal Due to Unrelated Test.Normal Scram Recovery Initiated & Mechanic Involved Counseled (← links)
- 05000254/LER-1984-010-04, :on 840530,trip of Reactor Protection Sys Experienced Due to Intermediate Range Monitors 11,14,15 & 17 Going hi-hi.Probably Caused by Personnel Bumping Instruments (← links)
- 05000254/LER-1984-009-04, :on 840519,while Performing Instrument Scram Response Test,Unplanned Reactor Scram Occurred.Caused by Workers Bumping IRM Signal Cable Under Reactor Vessel. Mechanical Maint Will Exercise Caution (← links)
- 05000254/LER-1995-005-08, :on 950812,B CR HVAC Sys Was Inoperable Due to Refrigerant Leak That Prevented Operation of Compressor. Fixed Damaged Joint & Inspected Remaining Joints (← links)
- 05000254/LER-1992-001-04, :on 920106,while Returning RWCU Sys to Service, Nrhx Alarm Led to Challenge to ESF Logic & Sys Isolation. Caused by Personnel Error.Valve 1-299-9 Closed.Valve 1-1299-9 to Be Removed (← links)
- 05000254/LER-1984-008-03, :on 840511,concern Raised Re Adequacy of 125- Volt Station Batteries Relative to Dc Load.Analysis Revealed Batteries Unable to Bring Units to Cold Shutdown W/O Some Nonessential Loads Shed.Battery Load Reduced (← links)
- 05000254/LER-1991-028-01, :on 911220,loss of Power to 1A RPS Bus Occurred.Caused by Low Generator Output Voltage.Rheostat Adjusted for Higher Generator Output Voltage & Returned to Svc (← links)
- 05000254/LER-1984-007-04, :on 840507,11 RHR Svc Water Vault Penetrations Found Leaking.Caused by Pipe Vibration Loosening Penetration Seals.Seal Bolts Tightened & Penetrations Tested Satisfactorily (← links)
- 05000254/LER-1991-027-01, :on 911216,leak from Drain Valve,Water Drained Through a Floor Pipe Onto an Emergency Bus.Caused by Leak from Reactor Bldg Sys Through Manual Drain Valve Which Was Open.Drain Valve Closed (← links)
- 05000254/LER-1991-024-01, :on 911203,determined That Required Discharge Time for CO2 Extinguishing Sys Did Not Meet Required Time of 1 Minute.Caused by Improper Installation of Discharge Nozzles.Hourly Fire Watch Initiated (← links)
- 05000254/LER-1984-006-03, :on 840501,performance of Maint on Turbine Isolation Valves & MSIVs Resulted in Communication Via Main Steam Piping Between Reactor Bldg & Turbine Bldg.Caused by Procedural Inadequacy (← links)
- 05000254/LER-1991-002-13, :on 911104,heater Failed to Attain 15 F Differential Temp.Cause Unknown.Revised Monthly Surveillance to Incorporate New Requirements.Declared B Train Afu Operable (← links)
- 05000254/LER-1992-005, :on 911201,while Performing Temporary Procedure 7253, Switchgear Operations for Mod MO4-(1)2-091-034 RCIC 1-1301-49 Pump Discharge Valve Failed to Open.Cause Unknown. MO-1-1301-48 & 1-1301-49 Valves Cycled (← links)
- 05000254/LER-1992-008-01, :on 910105,Inspectors Found That They Were Fouled W/Silt & Small Debris.Caused by Insufficient Cleaning Which Allowed Accumulation of Debris.Room Coolers Cleaned When Fouling Originally Discovered (← links)
- 05000254/LER-1992-007-01, :on 920228,control Room Isolation Dampers Closed & Ventilation Sys Automatically Entered Recirculation Mode.Caused by Inadequate Calibr & Probe Fitting Procedure. Analyzer Will Be Repaired & Procedures Revised (← links)
- 05000254/LER-1992-005-03, :on 911201,during RCIC Test,Rcic Pump Discharge Valve Failed.Cause Unknown & No Abnormalities Found.Valves Cycled & Stroked & Strip Chart Recorder Installed to Monitor Operating Voltage (← links)
- 05000254/LER-1992-006, :on 920214,loss of Main Control Room Annunciators Occurred.Caused by Power Surge Due to Lightning Strike Which Caused Fuse Failures.Breakers & Fuses Checked & Replaced as Necessary (← links)
- 05000254/LER-1992-004-03, :on 920207,Unit 1 Reactor Scram Occurred Due to Group I Isolation.Caused by Spurious Main Steam Line High Flow Trip Due to Unknown Cause.Applicable Instruments Calibr & Functionally Verified (← links)
- 05000254/LER-1992-003-03, :on 920206,Unit 1 HPCI Suction Lube Oil Pressure Relief Line Pipe Hanger Found Outside FSAR Compliance.Cause Unknown.Minor Design Change Initiated to Correct Pipe Hanger Configuration (← links)
- 05000254/LER-1984-003-06, :on 840306,three Full Reactor Scrams Received Due to Erratic Reactor Water Level Indications.Caused by Unusual Temp & Pressure Conditions Resulting from Procedure Allowing Water Cooling W/Reactor Not Vented (← links)
- 05000254/LER-1984-001-05, :on 840305,reactor Shutdown Initiated Due to HPCI Pump Lubrication Oil Being Containment W/Water & Electromatic Relief Valve 1-203-3E Failing to Open When Given Manual Signal.Caused by Leak (← links)
- 05000254/LER-1984-002-06, :on 840307,measured Combined Leakage Rate for All Penetrations & Valves Except MSIVs Found in Excess of Limit.Cause Unknown (← links)
- 05000254/LER-1991-026-01, :on 911208,drywell/torus Purge Fans 1A & 1B Racked Out & Dampers Closed.On 911209,alarm G-4 Received on Panel 912-5.Caused by Lack of Damper Position Labeling. Dampers Wired in Closed Position (← links)
- 05000254/LER-1991-023-01, :on 911126,control Room HVAC Toxic Gas Analyzer Annunicated Trouble Alarms,Causing Control Room Vents to Isolate.Cause Undetermined.Analyzer Declared Inoperable & New Probes Ordered (← links)
- 05000254/LER-1991-022-01, :on 911104, B Train CR HVAC Emergency Filtration Unit Failed to Attain Proper Differential Temp Due to Unknown Cause.Train Declared Inoperable.Supplemental Rept Will Be Submitted (← links)
- 05000254/LER-1991-021-01, :on 911025,RCIC Declared Inoperable Due to High Pump Flow in IST Required Action Range.Caused by Instrument Drift Due to Aging of Control Room.Control Room Tachometer Indicators Replaced (← links)
- 05000254/LER-1991-020-01, :on 910919,discovered That Recombiner Temps Not Verified to Be in Allowable Band Per TS 4.8.A.5.Caused by Personnel Error.Chart Drive & Motor on Recorder Replaced & Recorder Will Be Replaced W/New Model (← links)
- 05000254/LER-1991-019-01, :on 911005,control Room Train B Air Filtration Unit Declared Inoperable After Failing to Attain Proper Differential Temp.Caused by Design Deficiency in Thermowelds.Thermowelds Filled W/Oil (← links)
- 05000254/LER-1991-018-01, :on 910914,125-volt Dc Ground Isolated & RCIC Declared Inoperable to Repair Ground.Caused by Failure of EG-M Control Box.Control Box Replaced & RCIC Successfully Tested (← links)
- 05000254/LER-1976-001-01, /01T:on 760105,during Refueling Outage,Drywell Surveillance Revealed Pinhole Leak in Vessel Penetration (N-8B) Drain Line 1-0213-3/H-A.Caused by Improper Fillet Welding.Weld Being Repaired (← links)
- 05000254/LER-1976-002-03, /03L:eight Occurrences of Excessive Leakages Measured Re Primary Containment Isolation Valves During Local Leak Rate Testing.Tabular Summary of Leak Rate Test Failures Covered in Rept.Cause Not Yet Determined (← links)
- 05000254/LER-1976-004-01, /01T-0:on 760108,weld Exam Showed Crack on Both a & B Loops of Rx Reactor Recirculation Discharge Bypassed Line.Caused by Intergranular stress-assisted Corrosion. W/760122 Lt (← links)
- 05000254/LER-1976-005-01, /01L-0:on 760112,diesel Generator Failed to Start When Mode Switch Placed in Start Mode.Caused by Dirty Air Starting Solenoid Valve.Air Starting Motor & Solenoid Valve Cleaned & Generator Satisfactorily Tested (← links)
- 05000254/LER-1976-006-01, /01L-0:on 760119,during Refueling Outage,Cracks in Feedwater Spargers & Nozzles Discovered.Caused by flow-induced Vibration Fatigue & Compounded by Thermal Cycling Stress.Spargers Replaced & Cracks Ground Out (← links)
- 05000254/LER-1976-009-03, /03L-0:on 760303,during Routine Surveillance,Flow Check Valve 1-262-25A on Instrument Line Failed to Seat. Cause Not Stated.New Internals Installed & Tested in Maint Shop (← links)
- 05000254/LER-1975-021-01, /01T-0:on 751014,reactor Protection Sys Drywell High Pressure Scram Switches PS-1-1101-88A & B Found Valved Out.Caused by Instrument Mechanic Inadvertantly Leaving Pressure Switch Valves Closed (← links)
- 05000254/LER-1976-010-03, /03L-0:on 760305,interlock Broken When Personnel Entered from Reactor Bldg to Turbine Bldg.Caused by Defective Latch & Frame.Mod Being processed.W/760402 Forwarding Ltr (← links)
- 05000254/LER-1976-011-03, /03L-01:on 760314,temp of 153 F Reached on Outboard MSIV AO-1-203-20 Pilot Valve.Caused by MSIV Room Coolers Being Shut Off Sometime After Prestartup Check W/O Informing Shift engineer.W/760413 Forwarding Ltr (← links)
- 05000254/LER-1976-012-03, /03L-0:on 760310,watertight Door on RHR Svc Water Vault 1B Exceeded Limits When Leak Rate Tested.Caused by Roughness on Knife Edge & Partially Dried Out Gasket.W/ 760409 Forwarding Ltr (← links)
- 05000254/LER-1976-013-03, /03L-0:on 760317,diesel Generator 1/2 Out of Svc Too Long for Preventive Maint.Caused by Commuication Problem Between Operating & Maint Depts.Precaution to Be Added to Station procedure.W/760415 Forwarding Ltr (← links)
- 05000254/LER-1976-015-03, /03L-0:on 760325,standby Liquid Control Sys Pump B Had Discharge Pressure Fluctuations & Excessive Pump Noise.Caused by Setpoint Drift of Relief Valve B & Leaking of Internal Check valves.W/760423 Forwarding Ltr (← links)
- 05000254/LER-1976-017-03, L-0:on 760427,while Performing MSIV Surveillance, Duel Indication Received for Valves AO 1-203-1B & AO 1-203-1D.Caused by Switches Being Out of Alignment.Minor Air Leak repaired.W/760430 Forwarding Ltr (← links)
- 05000254/LER-1976-019-01, /01T-0:on 760617,HPCI Motor Speed Changer Failed to Operate During Monthly Surveillance.Caused by Inadequate Lubrication.Lubrication Schedule established.W/760701 Forwarding Ltr (← links)
- 05000254/LER-1976-020-03, /03L-0:on 760701,loss of Indication & Operability Occurred on Containment Spray Loop B Outboard Valve MO-1-1101-23B.Caused by Loose hold-down Bolts.Bolts tightened.W/760729 Forwarding Ltr (← links)
- 05000254/LER-1976-021-03, /03L-1:on 760709 Two Control Rods Withdrawn Simultaneously.Caused by Personnel Error.Procedure Rev Implemented to Further Clarify Control Rod Drive Maint Requirements (← links)
- 05000254/LER-1976-022-03, /03L-0:on 760723,operability Testing on Containment Cooling Loop Performed on Wrong Unit.Caused by Personnel Error (← links)
- 05000254/LER-1976-023-03, LER 023/03L-0:on 760727,diesel Generator 1/2 Out of Svc for Monthly Insp for 55 Minutes Longer than Tech Spec Limit of 1.5 H.Caused by Maint Personnel Not Being Aware of Time Limit.Procedure to Be Changed (← links)
- 05000254/LER-1984-005, :on 840414,following Induction Heat Stress Improvement Procedures,Visual & Ultrasonic Exam Revealed Several Reactor Recirculation Welds W/Water Seeping from Small Pinholes.Caused by IGSCC (← links)
- 05000254/LER-1982-039-03, /03L-0:on 821224,diesel Generator 1/2 Failed to Start Following Preventive Maint.Caused by Crack in 1/4-inch Copper Air Line.Crack Due to Crimp in Right Angle Bend in Line & Fatigue Failure at Stress Point.New Line Rebuilt (← links)
- 05000254/LER-1984-004-06, :on 840316,five MSIV Found Leaking in Excess of Tech Spec Limits.Cause Undetermined.Repairs Will Be Completed & Leakages Brought within Tech Spec Requirements Prior to Cycle 8 Startup (← links)
- 05000254/LER-1983-046-03, /03L-0:on 831128,RHR Svc Water Pump 1C Taken Out of Svc.Caused by Leakage of Teflon Seal Ring.Thicker Ring Fabricated & Installed.Leakage Eliminated (← links)
- 05000254/LER-1995-004-04, :on 950329,HPCI Sys Declared Inoperable from Motor Speed Changer Malfunction Due to Limit Switch Failure. Updated Plant Vendor Technical Manuals to Reflect Guidance for Installation & Adjustment of GE Limit Switches (← links)
- 05000254/LER-1991-015-02, :on 910826,unit One Cable Tunnel Sprinkler Sys Flow Switch Exceeded 14 Day Reporting Criteria.Event Occurred Because Sys Was Out of Svc for Enhancements. Mod Continued & Cable Sys Returned to Svc (← links)
- 05000254/LER-1991-014-02, :on 910208,discrepancy Discovered Between FSAR & Standby Gas Treatment Design Specs for Heater Logic Circuitry.Caused by Inadequate Review of Sar.Procedures to Test for Heater Operability Revised (← links)
- 05000254/LER-1991-011-02, :on 910813,determined That Differential Pressure Could Not Be Maintained During Secondary Containment Capability Test.Caused by Air in-leakage Via Reactor Bldg Roof.Setpoint Changed (← links)
- 05000254/LER-1983-045-01, /01T-0:on 831121,seven Namco Controls Limit Switches in Lot 00873 Found Assembled Improperly.Caused by Assembly Error During Mfg.Switches Will Be Repaired & Used as Necessary (← links)
- 05000254/LER-1983-043-03, /03L-0:on 831024,while Performing Suppression Chamber to Drywell Vacuum Breaker Monthly Exercise,Vacuum Breaker 1-1601-32C Showed Dual Indication While Closing. Caused by Limit Switch Out of Adjustment (← links)
- 05000254/LER-1983-044-03, /03L-0:on 831026,pressure Switch 2 of PSI-1-1622A Actuated at 0.52 Psid,Exceeding Tech Spec Limit.Caused by Instrument Setpoint Drift.Switch Recalibr (← links)
- 05000254/LER-1983-024-03, While Performing QOS-1600-1,Div 1 Position Indication Lights for Vacuum Breaker 1-601-33F Indicated Valve Not Closed.Caused by Binding in Switch Due to Corrosion (← links)
- 05000254/LER-1983-041-03, /03L-0:on 831019,while Analyzing Standby Liquid Control Sodium Pentaborate Concentration,Concentration Found to Exceed Tech Spec Limits.Caused by Inadequate Procedures. Concentration Tank Temp Increased (← links)
- 05000254/LER-1983-040-03, /03L-0:on 831019,11 Instances of Weekly Surveillance Not Performed Identified within Surveillance Interval.Caused by Personnel Error.Shift Engineers Assured Full Compliance for Future Surveillances (← links)
- 05000254/LER-1983-042-03, /03L-0:on 831024,station Diesel Fire Pump 1/2A Made Inoperable When Diesel Failed to Start on Battery Bank A.Caused by Battery end-of-life.New Battery Installed (← links)
- 05000254/LER-1991-010-02, :on 910614,RHR Shutdown Cooling Isolation Valves 1-1001-47 & 50 Isolated While Performing Instrument Functional Test.Caused by Procedural Deficiencies.Calibr & Functional Test Procedure Will Be Revised (← links)
- 05000254/LER-1990-021, :on 900812,RHR Valve 1001-50 Failed to Open During Shutdown Cooling & Startup Operations.Caused by Thermal Binding of Valve & Hydraulic Lock of Valve Operator.Valve Manually Operated (← links)
- 05000254/LER-1983-038-03, /03L-0:on 831006,while Performing HPCI Monthly Valve Operability Test,Qos 2300-3,HPCI Turbine Steam Supply Valve Mo 1-2301-3 Failed to Open.Sys Declared Inoperable. Caused by Changing Torque Characteristics (← links)
- 05000254/LER-1983-039-03, /03L-0:on 831009,during Monthly Suppression Chamber to Drywell Vacuum Breaker Exercise,Vacuum Breaker 1-1601-32F Would Not Indicate Full Open Position.Cause Unknown.Vacuum Breaker Repaired (← links)
- 05000254/LER-1983-037-03, /03L-0:on 830923,while Inerting Primary Containment,Containment Oxygen Not Reduced to Tech Spec Requirement.Caused by Sample Response Time & Probable Source of Air in-leakage Through Compressor (← links)
- 05000254/LER-1983-036-03, /03L-0:on 830920,discovered Ripped Ventilation & Fire Stop Boot.Caused by Extended Exposure of Boot to Heat & Normal Wear.Urethane Foam Matl Installed & Boot Replaced (← links)
- 05000254/LER-1983-034-03, /03L-0:on 830908,LPCI Loop Select for RHR Loop a Declared Inoperable Due to Inability to Close Recirculation Pump 1A Discharge Valve Mo 1-202-5A.Caused by Shorted Control Cables on Valve.Cables Replaced (← links)
- 05000254/LER-1983-035-03, /03L-0:on 830915,Target Rock Valve 1-203-3A Stuck Open.Caused by Eroded second-stage Pilot Seat.Valve Replaced & Tested Satisfactorily on 830922 (← links)
- 05000254/LER-1983-032-03, /03L-0:on 830901,while Preparing for Refuel Outage,Secondary Containment Capability Test Revealed Vacuum Attainment of 0.15-inch Water.Caused by Aged Gaskets on Personnel Access Doors.Gaskets Replaced (← links)
- 05000254/LER-1995-003-02, :on 950125,determined That TIP Sys Pci Ball Valves on Units 1 & 2 Outside Design Basis Due to Incomplete Review of Sys Circuitry.Mod to Unit 2 TIP Sys Will Be Installed During Next Unit 2 Refueling Outage (← links)
- 05000254/LER-1995-002-01, :on 950120,thermal Overloads Improperly Sized Found on CR HVAC Sys Due to Inadequate Original Design Analysis.Completed Issue Screened & Engineered Evaluation Performed (← links)
- 05000254/LER-1983-029-03, /03L-0:on 830711,while Repacking 1-1001-65B RHR Svc Water Pump,Pump Inboard Bearing Surfaces Found Pitted & Imbedded W/Dirt.Pump Packing Sleeve Slightly Worn.Caused by Leakage Through Worn Packing & Packing Sleeve (← links)
- 05000254/LER-1983-027-03, /03L-0:on 830706,during Diesel Insp Monthly Surveillance Qms 200-S3 on 1/2 Diesel Generator,Pushbutton Start Switch for Fuel Priming Pump Acted Erratically.Caused by Excessive Pitting of Switch Contacts (← links)
- 05000254/LER-1983-048-03, /03L-0:on 831229,results of Chimney Effluent Radionuclide Analysis Found to Be Less than Normal.Caused by Broken Power Cable to Heat Trace Due to Extreme Subzero Temps.Power Cable Replaced (← links)
- 05000254/LER-1991-017-01, :on 910904,B Train CR HVAC Emergency Air Filtration Unit Declared Inoperable Due to Equipment Failure & Inappropriate Heater Performance Criteria.Defective Differential Pressure Indicator Replaced (← links)
- 05000254/LER-1983-047-03, /03L-0:on 831210,during Traversing in-core Probe Sys Valve Test Qos 700-9,isolation Valve 2-733-1 Failed to Close.Caused by Buildup of Dry Lubricant Used in Probe Tubing.Valve Replaced (← links)
- 05000254/LER-1994-012-06, :on 941011,U-1 Drywell HP Switches Found Out of Tolerance.Caused by Setpoint Drift.Revising Calbr Procedure (← links)
- 05000254/LER-1994-011-05, :on 940829,CRD L-11 Failed to Scram When Given Signal Due to Pipe Plug Inserted Into Solenoid Valve Due to Personnel Not Adhering to Procedure.Crd Inserted to Position 00 & Insps Conducted for Similar Obstructions (← links)
- 05000254/LER-1983-012-01, /01T-1:on 830310,reactor Operator Inadvertently Inserted Control Rods in Reverse Order.Caused by Personnel Error.Control Room Personnel Will Be Instructed in Proper Procedures (← links)
- 05000254/LER-1983-026-03, /03L-0:on 830705,while Performing Main Steam Line High Flow Calibr,Discovered That Pressure Switch DPIS 1-261-2J Tripped at 146% Steam Flow.Probably Caused by Setpoint Drift.Instrument Recalibr (← links)
- 05000254/LER-1991-012, :on 910507,HPCI Turbine Stop Valve Failed to Stroke Fully Open During Manual Initiation Test.Caused by Long Bushing in Stuffing Box of Stop Valve Sliding Down. Stuffing Boxes,Bushings & Pins Replaced (← links)
- 05000254/LER-1994-014-05, :on 941107,twelve Instrument Maint Dept Fire Surveillance Exceeded Critical Dates.Caused by Lack of Training in Use of Stations General Surveillance Database for Im Dept Schedulers (← links)
- 05000254/LER-1991-009, :on 910427,Unit 1 RCIC Declared Inoperable Due to Failure to Meet Pump Requirements.Caused by Inadequate Calibr Procedure.Egm Controller & Governor Calibr,Changing Sys Parameters.Sys Declared Operable 910503 (← links)
- 05000254/LER-1983-025-03, /03L-0:on 830621,maint Dept Observed Valve Yoke Pulled Away from Valve Bonnet & Valve Steam Bent.Caused by Bolts Vibrating Loose.Bent Stem Straightened & Locking Tabs Installed on yoke-to-bonnet Bolting (← links)
- 05000254/LER-1994-015-03, :on 941002,single Loop Operation in Unanalyzed Condition Occurred.Caused by Failure to Previously Establish,In Procedure & Training,Min Core Flow Limit. Training & Procedure Revised (← links)
- 05000254/LER-1983-030-03, /03L-0:on 830722,while Performing Core Spray Sys Motion Operated Valve Operability Check Qos 1400-2,discharge Valve Mo 1-1402-25A Failed to Open.Caused by Defective Circuit Breaker Feeding Valve.Breaker Replaced (← links)
- 05000254/LER-1983-028-03, /03L-0:on 830715,RHR Return to Suppression Chamber valve,MO1001-36A,taken Out of Svc for Repairs Rendering Loop a Containment Cooling Inoperable.Caused by Breaker Trip Setting Too Low.Breaker Replaced (← links)
- 05000254/LER-1983-019-03, /03L-0:on 830412,1A Loop Core Spray Discharge Piping Pressure Indicated Above Tech Specs.Caused by Operator Failure to Properly Bleed Down Core Spray Discharge Piping & Failure of High Pressure Alarm to Annunciate (← links)
- 05000254/LER-1994-010-05, :on 940808,when Attempting to start-B-train CR Air Conditioning,Compressor Repeatedly Tripped on High Pressure Due to Plugged Svc Water Strainers.Flow Indicator Repaired & Procedure Qcop 5750-9 Changed (← links)
- 05000254/LER-1994-008-07, :on 940820,unit 1 Reactor Was Manually Scrammed by Procedure to Achieve Shutdown Condition Required by Tss. Caused by Work Practices Associated W/Crimping Terminal Lug. Wire Terminal Lugs Were Replaced W/New Parts (← links)
- 05000254/LER-1994-009-06, :on 940823,omissions in Inventory & Leak Test Paperwork Discovered During Review of Inventory & Leak Test Program for Sealed Sources.All Sealed Sources That Required Leak Test But Missed Tested (← links)
- 05000254/LER-1991-004-04, :on 910320,inadvertent Actuation of RHR Pumps Occurred.Caused by Personnel Error.Rhr Sys Lineup Corrected, Temporary Procedures Reviewed & Testing Successfully Completed (← links)
- 05000254/LER-1994-006-05, :on 940808,uncontrolled Personnel Exposure from Sr-90 Radioactive Source Occurred Due to Personnel Error. Access to Check Sources Restricted & General Employee Training Will Be Modified as Necessary (← links)
- 05000254/LER-1991-007, :on 910216,electromatic Relief Valve Lifted During Hydrostatic Testing.Caused by Component Failure. Immediate Corrective Action Terminate Vessel Hydrostatic Test & Investigate Problem (← links)
- 05000254/LER-1983-010-03, /03L-0:on 830224,reactor Bldg & Control Room Ventilation Sys Isolated & Standby Gas Treatment auto-started Due to Apparent Spike in Refuel Floor Radiation Monitors.Caused by Failure of Relay Coil 1705-108 (← links)
- 05000254/LER-1983-023-03, /03L-0:on 830522,electromatic Relief Valve Opened for No Obvious Reason at Aprrox 60 Psig.Caused by Electromatic Relief Pilot Valve Assembly Stuck in Open Position.Pilot Valve Replaced (← links)
- 05000254/LER-1983-022-03, /03L-0:on 830523,RCIC Steam Supply Valve MO-1-1301-16 Did Not Give Open Position Indication When Operated from Control Room.Valve Found Open.Caused by Loose Wire on Open Limit Switch (← links)
- 05000254/LER-1983-020-03, /03L-0:on 830510,while Performing Monthly Exercise Qos 1600-1,Div II Indicating Lights for Vacuum Breaker 1-1601-33F Did Not Operate When Valve Exercised.Caused by Slight Binding in Vacuum Breaker Main Shaft (← links)
- 05000254/LER-1983-021-01, /01T-0:on 830520,pinhole Leak Discovered on Reactor Continuous Head Vent Line.Caused by Slag Entrapment within Weld During Initial Installation.Indication Removed & Rewelded (← links)
- 05000254/LER-1983-018-03, /03L-0:on 830412,excessively High Discharge Pressure & Low Flow Observed from RHR Svc Water Pump 1-1001-65C.Caused by anti-rotation Pin Falling Out of Valve Operator.Pin Replaced & Screw Tightened (← links)
- 05000254/LER-1983-017-03, /03L-0:on 830412,RHR Svc Water Pump 1-1001-65C Taken Out of Svc to Facilitate Repair of Broken Coupling on RHR Svc Water Vault Room Cooler 1-5745-C Drain Line.Caused by Overpressurization of Piping (← links)
- 05000254/LER-1983-008-03, /03L-0:on 830210,during Functional Test Qis 35-2, Fuel Pool Radiation Monitor 1-1705-16A Failed to Trip Upscale.Caused by Instrument Calibr Drift.Monitor Recalibr & Function Test Completed Satisfactorily (← links)
- 05000254/LER-1983-006-03, /03L-0:on 830213,during Monthly Surveillance Test on Condenser Pit 5-ft Trip Circuits,Level Switch 1-4441-25B Failed to Give Circulating Water Pump Trip Signal.Caused by Broken Wire in Switch Mechanism.Switch Replaced (← links)
- 05000254/LER-1983-002-03, /03L-0:on 830119,during HPCI Operability Test, Motor Speed Changer Would Not Move from Low Speed Stop. Caused by Excessive Friction.Low Speed Stop Post Filed Down Until Post Merely Rested Against Collar Tab (← links)
- 05000254/LER-1983-005-03, /03L-0:on 830115,HPCI Motor Gear Unit Raised to Normal High Speed Stop But Returned to Low Speed Stop When Manual Operation Switch Released.Caused by Failed Power Supply Resistor.Resistor & Amplifier Replaced (← links)
- 05000254/LER-1983-003-03, /03L-0:on 830118,during Reactor Water Level Calibr Procedure Qis 10-1,switch LIS-1-263-58A Tripped Below Tech Specs.Caused by Instrument Setpoint Drift.Level Switch Recalibr (← links)
- 05000254/LER-1983-004-03, /03L-0:on 830109,containment Cooling Loop a Taken Out of Svc for Preventive Maint on RHR 1A Hx.New Gaskets for Inner Head & Drain Line of HX Installed to Repair Small Leaks (← links)
- 05000254/LER-1994-007-03, :on 940321,HPCI Restricting Orifice (RO) Found Clogged Approx 95% Closed.Cause of Clogged RO Unknown.Steam Line Drain ROs & Steam Traps on Unit 2 HPCI & RCIC Sys Disassembled & Inspected (← links)
- 05000254/LER-1991-006, :on 910219,ESF Actuation Occurred Due to Unexpected Loss of Power to Channel B of Reactor Protection Sys,Causing Primary Containment Isolation.Caused by Mechanical Vibration.Power Reestablished (← links)
- 05000254/LER-1991-005, :on 910131,Train B of Standby Gas Treatment Sys Unexpectedly Autostarted,Resulting in Deenergization of Primary Containment Isolation Group II Relay Logic.Caused by Inadequate Procedure.Relay Logic Reset (← links)
- 05000254/LER-1993-021, :on 931201,discovered That Fis 1-1360-7 Was Found to Have Failed Full Scale Due to Equipment Malfunctions.Switch Was Replaced & Both Units Were Calibrated to Work within Pressure Range (← links)
- 05000254/LER-1993-011-02, :on 930721,discovered That 4KV Breaker 68, Feeding 1B Core Spray Pump Motor Was Open & Discharged Due to Personnel Error.Procedure Change Has Been Processed to Standardize Window Colors Part of PM Program (← links)
- 05000254/LER-1990-025, :on 901206,ESF Group II Isolation Occurred Due to Spurious Signal from Low Level Transmitter Lt 1-263-58A. Caused by Formation of Air Pocket in Transmitter Ref Leg. Procedures for Draining Vessel Enhanced (← links)
- 05000254/LER-1983-015-03, /03L-0:on 830405,reactor Bldg & Control Room Ventilation Sys Isolated & Standby Gas Treatment Autostarted.Caused by Failure of Relay Coil 1701-100A.Coil Replaced.Relay Will Be Replaced (← links)
- 05000254/LER-1983-014-03, /03L-0:on 830322,low Electrolyte Level Found in Station Battery Cell 100.Caused by Crack in Bottom Corner of Casing.Normal Loads Transferred to Unit 2 250-volt Battery on 830324.Cell Replaced (← links)
- 05000254/LER-1983-013-03, /03L-0:on 830319,1A MSIV Air Pilot Valve Temp Indicator Found Inoperable.Caused by Personnel Error.Wiring Error Corrected & Personnel Reprimanded (← links)
- 05000254/LER-1982-020-03, /03L-0:on 820920 & 21,RCIC Area High Temp Isolation QIS-28,3 Switches 1-1360-14A,1-1360-17B & 1-1360-16C,would Not Trip.Cause Not Specifically Determined. Failed Switches Returned to Manufacturer for Analysis (← links)
- 05000254/LER-1983-011-03, /03L-0:on 830225,during Low Condenser Vacuum Calibr & Functional Tests,Pressure Switch PS-1-503A Tripped at 20.9 Inches Hg Vacuum.Caused by Setpoint Drift.Switch Recalibr & Functionally Tested (← links)
- 05000254/LER-1983-007-03, /03L-0:on 830214,suppression Chamber Nitrogen Purge Valve AO-1-1601-56 Failed to Isolate During Maint on Drywell High Radiation Monitors.Caused by Failure of Solenoid Pilot Valve.Valve Replaced (← links)
- 05000254/LER-1989-022, :on 891128,unit 1 High Pressure Coolant Injection Sys Declared Inoperable Following Unexpected Actuation of HPCI Pump Room Deluge Sys.Cause Unknown. Procedure Revised & Operator Trained (← links)
- 05000254/LER-1994-001-04, :on 940102,inadvertent Insertion of Control Rod H-1 from Position 48 to 14 Occurred During Instrument Maint Surveillance.Cause Not Determined.Crd H-1 Inserted Into Position 00 & HCU Rebuilt (← links)
- 05000254/LER-1991-001-02, :on 910105,several Fuses Pulled,Causing Group II Isolation.On 910110,movement of Chaffed Wire Created Electrical Short & Caused Blown Fuse.Caused by Personnel Error & Equipment Failure (← links)
- 05000254/LER-1982-035-03, /03L-0:on 821021,during Surveillance Test,Offgas Isolation Valves Failed to Close within 15 Minutes.Caused by Setpoint Drift on 15 Minute Offgas Sys Isolation Delay Timer.Timer Reset & Procedure to Verify Setting Initiated (← links)
- 05000254/LER-1990-033, :on 901223,standby Gas Treatment Sys Auto Started,Reactor Bldg & Control Room Ventilation Sys Isolated & drywell-to-torus Purge Fans Tripped.Caused by Blown Fuse in HVAC Isolation Logic.Fuse Replaced (← links)
- 05000254/LER-1982-034-03, /03L-0:on 821013,during Reactor Bldg Fuel Pool Monitoring Functional Test,Fuel Pool Monitor 1-1705-16A Tripped at Level Greater than Tech Specs.Caused by Instrument Set Point Draft.Unit Recalibr (← links)
- 05000254/LER-1990-031, :on 901120,while Performing HPCI Turbine Area Temp Isolation Calibr,Setpoints of All Four Temp Switches Higher than Tech Spec Limits.Cause Not Determined.Switches Will Be Replaced & Calibr (← links)
- 05000254/LER-1990-030, :on 901108,ABB Impell Corp Informed Util That Reactor Recirculation Piping Potentially Ouside Seismic Design Basis.Caused by Design Discrepancy During Seismic Modeling.Whip Restraints Modified (← links)
- 05000254/LER-1990-027, :on 901104,Tech Spec Surveillance Improperly Performed in Economic Generating Control Due to Personnel Error (← links)
- 05000254/LER-1990-023, :on 901031,reactor Core Isolation Cooling & Core Spray Pumps Declared Inoperable (← links)
- 05000254/LER-1982-028-03, /03L-0:on 820719,while Performing Reactor High Pressure Scram Functional Test,Pressure Switch PS-1-263-55A Found to Trip at 1061 Psig.Caused by Instrument Setpoint Drift.Switch Recalibr (← links)
- 05000254/LER-1994-004-04, :on 940228,results of Feedwater Flow Testing Found Flow Indications in Nonconservative Direction.Cause Not Determined.Management Issued Special Instructions.W/ (← links)
- 05000254/LER-1982-024-03, /03L-0:on 820826,RHR Svc Water pump,1-1001-65D, Removed from Svc to Repair RHR Room Cooler Isolation Valve. Following Preventive Maint & Repair,Pump Returned to Svc (← links)
- 05000254/LER-1982-023-03, /03L-0:on 820824,RHR Sys Svc Water Pump 1-1001-65A Removed from Svc to Repack Room Cooler Isolation Valve.Pump Removed for Preventive Maint on Associated Room Cooler Isolation Valve.Maint Completed & Pump Returned to Svc (← links)
- 05000254/LER-1983-001-03, /03L-0:on 830104,diesel Generator 1/2 Tripped on High Crankcase Pressure Signal.Caused by Lubricating Oil Splashing on Pressure Sensor Upon Startup.Sensor Replaced (← links)
- 05000254/LER-1994-003-03, :on 940121,noted Continuous Firewatch Not Established Following Impairment of Safe Shutdown Path Due to Inadequate Verbal Communications.Formal Training W/ Support of Fire Protection Sys Engineer Will Be Conducted (← links)
- 05000254/LER-1990-016-02, :on 900809,loss of Diesel Fire Pump 1/2A Due to Failure of Starting Relays Occurred.Caused by Component Failure.Relays Replaced (← links)
- 05000254/LER-1990-017, :on 900811,observed Excessive Leakage Through HPCI Steam Exhaust Check Valve Due to Deterioration of Seat. Caused by Gap Between Seat & Disk Along Ctr Sealing Surface of Disks.Steam Exhaust Check Valve Replaced (← links)
- 05000254/LER-1982-025-03, /03L-0:on 820907,1/2A Standby Gas Treatment Train Heater Found Tripped During Procedure Qop 020-1.Caused by Conservative Switch Setting Due to Inadequate Setpoint Differences.Heater Trip Reset (← links)
- 05000254/LER-1982-032-03, /03L-0:on 820905,HPCI Removed from Svc W/O Actuation of Electromatic Relief Valves.Caused by Need to Perform Scheduled Turbine Overspeed Surveillance Test.Hpci Sys Will Be Tested Operable Upon Return to Power (← links)
- 05000254/LER-1982-029-01, /01T-0:on 820916,two Small Cracks Found in Heat Affected Zone of Welds 12S-F9 & F10 of Reactor Water Cleanup Sys Piping.Caused by Stress Corrosion.Piping to Be Replaced W/Stainless Steel Pipe & Fittings Prior to Startup (← links)
- 05000254/LER-1982-031-03, /03L-0:on 820905,RCIC Sys Taken Out of Svc to Uncouple Turbine from Pump.Caused by Need to Perform Scheduled Turbine Overspeed Surveillance Test (← links)
- 05000254/LER-1982-030-03, /03L-0:on 820905,while Testing RHR Svc Water Pump 1-1001-65D,packing Found Burned.Caused by Excessive Tightening in Packing to Limit Leakage.Mods Installed to Protect Bearings from Seal Leakage (← links)
- 05000254/LER-1982-022-03, /03L-0:on 820816,1/2B Diesel Fire Pump Discovered Not Repaired & Returned to Svc within 7 Days After Pump Failed to Reach 2,000 Gpm Rated Capacity on 820809.Cause of Failure Not Determined.Wear Rings Will Be Replaced (← links)
- 05000254/LER-1982-021-03, /03L-0:on 820801,1D RHR Sys Svc Water Pump Removed to Replace Leaking Vent on Low Pressure Stage of Pump.Caused by Stress Fatigue.Vent Connector Removed & Plugged (← links)
- 05000254/LER-1982-012-01, /01T-0:on 820622,following Scram on Unit 2,1/2 Diesel Generator Tripped When a RHR Svc Water Pump Started. Caused by Underexcitation of Diesel Relays.Relays Removed Pending Design Change (← links)
- 05000254/LER-1993-023-02, :on 931216,discovered Engineered Safety Feature Actuation Occurred.Caused by Main Turbine Control Logic Relay Failure.Relays Tested & Replaced.Station Investigating Options for Reliability & Adding Redundancy (← links)