Pages that link to "05000285/LER-1983-001, Forwards LER 83-001/03L-0"
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The following pages link to 05000285/LER-1983-001, Forwards LER 83-001/03L-0:
Displayed 4 items.
- ML20071B856 (← links)
- ML20071B519 (redirect page) (← links)
- 05000285/LER-1983-001 (redirect page) (← links)
- 05000285/LER-2015-001, Inadequate Design of High Energy Line Break Barriers (← links)
- 05000285/LER-2007-005 (← links)
- 05000285/LER-2002-004 (← links)
- 05000285/LER-2001-001 (← links)
- 05000285/LER-1982-014, Forwards LER 82-014/03L-0 (← links)
- 05000285/LER-1982-011, Forwards LER 82-011/01T-0 (← links)
- 05000285/LER-1982-012, Forwards LER 82-012/01T-0 (← links)
- 05000285/LER-1982-010, Forwards LER 82-010/03L-0 (← links)
- 05000285/LER-1950-285, Documents Deletion of Licensing Basis Commitment in LER 50-285/77-5 Re Failure of Reactor Protective Sys Trip Unit to Trip Prescribed Setpoint,Due to Improper Pretrip & Trip Indication Bulbs in Trip Unit Circuitry (← links)
- 05000285/LER-1982-017, Forwards LER 82-017/03L-0.Detailed Event Analysis Submitted (← links)
- 05000285/LER-1982-018, Forwards LER 82-018/01T-0 (← links)
- 05000285/LER-1982-021, Forwards LER 82-021/03L-0 (← links)
- 05000285/LER-1982-015, Forwards LER 82-015/03L-0 (← links)
- 05000285/LER-1982-016, Forwards LER 82-016/03L-0 (← links)
- 05000285/LER-1983-001, Forwards LER 83-001/03L-0 (← links)
- 05000285/LER-1983-003, Forwards LER 83-003/01T-0 (← links)
- 05000285/LER-1976-005, Suppl 1 to LER 76-05/03L:on 770210,recirculation Actuation Pressure Switches Found Out of Tolerance.Cause Not Stated. Switch Will Be Calibr Monthly Until New Switches Installed (← links)
- 05000285/LER-1976-030, Summary of 760902 Telcon on LER 76-30/01L Re Steam Generator Blowdown Radiation Monitor Setpoints Out of Spec.Caused by Use of Unofficial & Incorrect Document as Part of 760804 Surveillance Test (← links)
- 05000285/LER-1976-032, Summary of 761004 Telephone Communication on LER 76-32/01L Re Reactor Coolant Observed Spraying from Weld Area on Seal Leakoff Line on Reactor Coolant Pump RC-3C.Leakage Isolated by Manual Isolation Valve (← links)
- 05000285/LER-1976-010, Suppl to LER 76-10/03L:on 760401,high Power Margin to Trip Meter B Drifted from 4.2% to 6% Power.Caused by Drift of Feed Back Limiter Module 19-317-2X.Module Calibr & Operated Satisfactorily (← links)
- 05000285/LER-1976-019, Suppl 1 to LER 76-19/03L:on 761001,five of 10 Valve Setpoints Drifted from Tech Spec Tolerance of Plus or Minus 1%.Caused by Change in Environ Condition.Valves Will Be Inspected During Refueling Outage (← links)
- 05000285/LER-1976-021, Suppl 1 to LER 76-21/03L:on 760802,timer Relays for SI-3A, AC-3B & SI-3B Failed to Time Out at Set Times.Caused by Binding Operating Mechanisms.Timers Tested Twice Weekly to Verify Operability Until Replacements Received (← links)
- 05000285/LER-1978-046, Forwards LER 78-046/03L-0 (← links)
- 05000285/LER-1991-009, Corrected Ltr Forwarding LER 91-009-00.Memo Stationery Inadvertently Used Instead of Letterhead Stationery for Cover Ltr (← links)
- 05000285/LER-1991-003, Informs of Extension of Completion Date for Changing Abnormal Operating Procedures & Emergency Operating Procedures to Resolve Containment Penetration M-3 Potential Leak Path Issue,Per 910306 LER 91-003 (← links)
- 05000285/LER-1991-008, Revises Completion Dates for Corrective Actions to Address LER 91-08 Re Inappropriate Surveillance Requirements for RPS Level I Bistables & LER 91-11 Re Pressurizer Pressure Low Signal Setpoints to 921120 & 1231,respectively (← links)
- 05000285/LER-1992-016, Revises Commitment to AEC Safety Guide 1 (Reg Guide 1.1), Contained in Section 6.2 of Updated Sar.Commitment Covers Method of Calculating Available Net Positive Suction Head for Containment Spray Sys Per LER 92-016 (← links)
- 05000285/LER-1984-020, Informs That LER 84-020 Re Containment Hydrogen Monitors VA-81A & VA-81B Requires 7-day Extension to Ensure Complete & Adequate Response.Rept Will Be Submitted by 841022 (← links)
- 05000285/LER-1982-007, Forwards LER 82-007/03L-0 (← links)
- 05000285/LER-1979-015, Forwards LER 79-015/01T-0 (← links)
- 05000285/LER-1978-032, Forwards LER 78-032/03L-0 (← links)
- 05000285/LER-1979-017, Forwards LER 79-017/03L-0 (← links)
- 05000285/LER-1977-009, Advises That Util Modified Testing Frequency for Ac Sequencer Timing Relay,Per Commitment in LER 77-09 (← links)
- 05000285/LER-1987-026, Discusses 871015 Enforcement Conference W/Nrc Re Violations Noted in Insp Rept 50-285/87-21.Violation Re Failure to Issue LER for Unlocked Door.Util Prepared & Submitted LER 87-026 Re Violation,Per 871015 Discussion (← links)
- 05000285/LER-1989-002, Forwards Corrected LER 89-002 & LER 89-003 (← links)
- 05000285/LER-1987-039, Advises That LER 87-039 Erroneously Designated as 87-038 in Cover Ltr.Subj LER Contained Correct LER Number (← links)
- 05000285/LER-1992-018, Updates Status of Corrective Actions in LER 92-018 Re Replacement of Carbon Steel Fasteners in Boric Acid Sys. Current Carbon Steel Fasteners Will Perform Satisfactorily Until Scheduled Replacement (← links)
- 05000285/LER-1998-007, :on 980522,TS Violation of ISI Reporting Requirements,Was Noted.Caused by Interpretation of Requirements of 10CFR50.55a(g)(5)(iv) Which Differs from Nrc.Listing of Exams Given to NRC (← links)
- 05000285/LER-1998-005, :on 980520,161 Kv Transmission Line Circuit Breakers Tripped.Caused by Inappropriate Actuation of Deluge Sys for Transformer T1A-3.Transformer T1A-3 Was Checked to Ensure No Damage to Transformer Occurred (← links)
- 05000285/LER-1989-014, :on 890519,auxiliary Feedwater Panel Instrumentation Outside Design Basis Revealed.Caused by Deficiencies in Instrumentation.Fire Watch Established & Stated Abnormal Operating Procedure Modified (← links)
- 05000285/LER-1998-004, :on 980423,determined That Indication in Fort Calhoun Station SG Tube Had Been Identified During 1996 Exams,But Had Been Inadvertently Left in Svc.Caused by Personnel Error.Procedures Revised (← links)
- 05000285/LER-1989-011, :on 890418,hourly Fire Watch Patrol at Door 1025-2 Not Performed & Penetration Seal Not Restored to Operable Status within 7 Days.Caused by Use of Uncontrolled Working List.Security Bulletin Issued (← links)
- 05000285/LER-1989-018, :on 890803,determined That Required Hourly Fire Watch Patrol at Door 989-14 Not Performed Since 890729.Caused by Inadequate Procedural Controls.Fire Protection Impairments Log Revised (← links)
- 05000285/LER-1989-010, :on 890419,discovered That Polyflow Tubing to Sample Point on Roof Disconnected on Channel B of Two Toxic Gas Monitors.Caused by Deficiencies in Station Mod Program. Sample Tubing Replaced & Flow Rate Retested (← links)
- 05000285/LER-1998-003, :on 980407,violation of TS for Control of High Radiation Area Was Noted.Caused by Inadequate Communication of Mgt Expectations.Expectations of Radiation Area Controls Will Be Given to All Radiation Workers (← links)
- 05000285/LER-1989-015, :on 890613,determined That Emergency Lighting Required for Shutdown During Fire to Be Marginal or Deficient in Some Areas.Caused by Inadequate Initial Verification That Requirements of App R Met (← links)
- 05000285/LER-1989-009, :on 890330,dual Alarm Setpoint Switch Connected to Radiation Monitor RM-061 Not Seismically Analyzed & Mounting Box Could Become Missile During Seismic Event. Caused by Design Error.Design Improved (← links)
- 05000285/LER-1989-007, :on 890324,inadequate Analysis for Feedwater Regulating Valves Noted.Temporary Mod TM-89-M-19 Initiated & Analysis in Progress to Convert Temporary Mod to Permanent Mod (← links)
- 05000285/LER-1988-021, :on 880902,determined That Control Room Panels W/O Smoke Detectors.Maint Order 88393 Issued to Install Smoke Detectors in Panels (← links)
- 05000285/LER-1988-020, :on 880903,diesel Oil Storage Tank 7 Day Run Capacity Requirement Exceeded.Review of Design Basis Determined Amount of Diesel Fuel Required.Revised Emergency Planning Procedure to Provide Guidance (← links)
- 05000285/LER-1989-013, :on 890517,control Room Operator Failed to Take Toxic Gas Monitor Readings Per Procedure ST-TGM-1-F.1.Caused by Personnel Error.Procedure Data Form Changed to Make More Obvious When Toxic Gas Monitor Reading Missing (← links)
- 05000285/LER-1988-038, :on 881231,ESF Actuation Occurred W/Technician Working on Mod to Pressurizer Level Instrumentation Behind Control Panels CB-1/2/3.Affected Sys Returned to Svc & Containment Purge Restarted (← links)
- 05000285/LER-1989-008, :on 890112,surveillance Test Coordinator Discovered That Testing Interval for ST-FP-2, Fire Protection Sys Diesel Fire Pump Battery, Not Met,Per Tech Spec 3.15(7)a.Changes Will Be Implemented (← links)
- 05000285/LER-1987-038, :on 871130,leak Rate in Excess of 18,000 Sccm Tech Spec Limit Found.Caused by Position of Valve Being Slightly Past Fully Closed Position.Adjustment of Mechanical Stops for Actuator Corrected (← links)
- 05000285/LER-1987-037, :on 871111 & 25,discovered That Diesel Generator Surveillance Tests Not in Conformance W/Tech Specs.Caused by Procedural Inadequacy.Diesel Generator Surveillance Test Modified (← links)
- 05000285/LER-1987-025-01, :on 870923,diesel Generator 2 Shutdown Due to High Coolant Temp.Caused by Presence of Residue Causing Pilot Valve That Directs Air Flow to Stick.Pilot Valve Inspected & Cleaned & Accumulator Drained (← links)
- 05000285/LER-1987-027, :on 871008,unplanned Actuation of Containment Isolation Actuation Signal Occurred.Caused by Inadvertently Turning Channel Pressurizer Pressure Low Signal Test Switch to Test Position.Surveillance Test Revised (← links)
- 05000285/LER-1987-036, :on 871111,inadvertent Auxiliary Feedwater Actuation Occurred.Caused by Personnel Error Due to Similarity in Switch Labeling.Labeling Changes & Rev to Procedure ST-FW-3 Will Be Implemented (← links)
- 05000285/LER-1987-029, :on 871101,discovered Containment Emergency Lighting Surveillance Test Not Conducted in 1986.Caused by Overlooking Surveillance Test.Importance of Conducting Tests Reiterated to Station Personnel (← links)
- 05000285/LER-1987-033, :on 870706,clarified Water Entered Instrument Air Sys During Surveillance Test of Diesel Generator Room Dry Pipe Sprinkler Sys.Caused by Foreign Matl Preventing Interfacing Check Valves from Closing (← links)
- 05000285/LER-1987-027, :on 871008,unplanned Actuation of Containment Isolation Actuation Signal Occurred.Caused by Test Switch Inadvertently Turning to Test Position Prior to Isolation of Channel B.Sys Reset & Test ST-ESF-2 Revised (← links)
- 05000285/LER-1987-028, :on 871008,discovered That Special Rept on Fire Barrier Operability Re Barrier Separating Fire Areas 41 & 42 Rendered Inoperable on 870319,not Submitted.Caused by Administrative Oversight (← links)
- 05000285/LER-1998-008, :on 980528,noted That Plant Had Operated Outside of Design Basis of AFW Sys Due to Overpressurization of AFW Piping.Caused by Misadjustment of Governor.Installed Mod to Sense Overpressure Condition (← links)
- 05000285/LER-1987-023, :on 870625,inspector Noted That Radiation Monitor Out of Svc in Violation of Tech Specs 2.21.Cause Not Stated.Operating Instruction for RCS Startup Revised to Include Prerequisite That Tech Specs 2.21 Met (← links)
- 05000285/LER-1989-006, :on 890131,testing Interval for Surveillance Test ST-FD-2 Not Met Per Tech Spec 3.15(9).Caused by Maint Personnel error.ST-FD-2 Will Be Changed to Specify as Semiannual Test & Rev of Annual Tests Planned (← links)
- 05000285/LER-1987-025, :on 870923,diesel Generator 2 Automatically Shutdown Due to High Coolant Temp.Caused by Failure of Radiator Exhaust Damper to Fully Open Due to Residue on Pilot Valve.Valve Inspected & Cleaned (← links)
- 05000285/LER-1987-017, :on 870506,Tech Spec 3.7(1d) Found Violated Due to Delay of 1986 Annual Insp of Emergency Diesel Generator D-2.Caused by Util Not Wanting to Restart Unit Concurrent W/ Diesel Overhaul.Generator Tested.Specs Amended (← links)
- 05000285/LER-1987-015, :on 870520,closing of Circuit Breaker Caused Voltage Loss on Instrument Bus Resulting in Unblocking Pressurizer Pressure Low Signal Actuation Circuitry.Cause Undetermined.No Corrective Actions Needed (← links)
- 05000285/LER-1989-005, :on 890126,contract Electrician Performed Maint Inside Posted High Radiation Area W/O Radiation Protection Coverage.Caused by Personnel Error.Cross Training Arranged & Procedure Reviewed for Upgrading (← links)
- 05000285/LER-1989-003, Engineering Determined That Damper Should Have Been Included in Surveillance Test Upon Installation.Caused by Procedure Change 26043 Initiated to Add Damper to Surveillance Test & Drawing Rev Submitted (← links)
- 05000285/LER-1987-022, :on 870415,magnetic Particle Exams of Emergency Feedwater Storage Tank Detected Surface Cracking & Extensive Subsurface Defects,Including Slag Inclusions & Lack of Fusion.Caused by Shrinkage & Poor Workmanship (← links)
- 05000285/LER-1987-021, :on 870602,during Reactor Startup Operations Personnel Discovered That Offsite Power Low Signal Still in Bypass at RCS Temp of 530 F.Caused by Inconsistency Between Procedure & Tech Specs (← links)
- 05000285/LER-1987-024, :on 870813,unplanned Actuation of Ventilation Isolation Actuation Sys Occurred.Caused by Connecting Test Equipment to Radiation Monitor Before Equipment Reset.Addl Step Added to Listed Calibr Procedures (← links)
- 05000285/LER-1987-020, :on 870602,unplanned Actuation of Ventilation Isolation Actuation Signal Occurred.Caused by Monitors Having Lower Shutdown Setpoints than Appropriate for Heatup. Radiation Monitor Setpoints Checked (← links)
- 05000285/LER-1998-001, :on 980202,TS Violation Occurred Due to Inadequate Inservice Testing.Caused by Lack of Attention to Detail When FCS ISI Program Plan for 3rd ten-year Interval Was Put Together in 1992.Changes Will Be Made (← links)
- 05000285/LER-1998-002, :on 980226,TS Violation Was Noted Due to Exceeding Qualified Life for Plant Components.Caused by Lack of Depth Analysis When Original Calculation Was Performed. a Panel Was Repaired & Returned to Service (← links)
- 05000285/LER-1997-017, :on 971107,low Pressure Safety Injection in Unanalyzed Condition Occurred,Due to Potential for Voiding. OPPD Has Administrative Controls in Place to Monitor & Prevent Conditions Necessary for Voiding (← links)
- 05000285/LER-1997-013, :on 970826,TS 2.0.1, Motherhood Was Entered Into General Shutdown Voluntarily.Caused by Failed Switch. Replaced & Tested Inverter Switch & Returned Plant to Full Power (← links)
- 05000285/LER-1987-019, :on 870527,diesel Driven Fire Pump Improperly Returned to Svc,Resulting in One Fire Pump Being Inoperable in Excess of 7 Days.Caused by Personnel Error.Addl Training Will Be Provided (← links)
- 05000285/LER-1997-010, :on 970731,violation of TS Occurred While Moving Spent Fuel in Spent Fuel Pool.Caused by Inadequate Design of CEA Locking Clip.Moved Affected Assembly to Region I of Spent Fuel Pool (← links)
- 05000285/LER-1987-010, :on 870408,discovered Surveillance Tests Not Containing Steps to Verify Stroke Test Requirements of ASME Section Xi,Subsection IWV-3522.b for Valves FW-173 & FW-174. Revs Made to Operating Instructions (← links)
- 05000285/LER-1987-009, :on 870404,during Refueling Shutdown Condition, All Offsite Ac Power Was Lost.Caused by Worker Inadvertently Pulling Wrong Potential Transformer (PT) Fuses.Pt Fuses Associated W/Transformer Reinstalled (← links)
- 05000285/LER-1987-015, :on 870520,partial Actuation of ESF Occurred When Closing of Circuit Breaker Initiated Transient on Bus D Causing Inverter D to Automatically Transfer to Alternate Ac Source.Cause Unknown.Inverters Tested (← links)
- 05000285/LER-1987-014, :on 870507,during Surveillance Test,One of Two Valves Failed to Lift within Setpoint Requirements of Tech Spec.Caused by Drift of Safety Valve Setting Over Operating Cycle.Valves Recalibr (← links)
- 05000285/LER-1987-018, :on 870504,design Deficiencies of Valve Operator Sys for HCV-385 & HCV-386 Identified.Mod Completed & Valves Retested (← links)
- 05000285/LER-1987-016, :on 870504 & 05,discovered That Surveillance Test ST-FP-10,scheduled for 861111 Not Performed.Caused by Inadequate Responsibility Assignment.Procedure Change Incorporated Into ST-FP-10 (← links)
- 05000285/LER-1987-017, :on 870506,Tech Spec 3.7(1d) Re Annual Insp of Diesel Generator Violated.Caused by Erroneous Interpretation of Tech Specs.Amend to Tech Spec 3.7 Revising Annual Insp Surveillance Interval Submitted (← links)
- 05000285/LER-1987-013, :on 870506,deficiencies in Control Room Ventilation Sys,Including Unfiltered Air Inleakage, Discovered During NRC Insp Re Control Room Habitability Analysis.Repairs Made to Reduce Leakage (← links)
- 05000285/LER-1987-011, :on 870428,ventilation Isolation Actuation Sys (Vias) Actuated During Clutch Power Supply Swap.Cause Under Investigation.Pressurizer Pressure Low Signal Relocked & Safety Injection Actuation Signal & Vias Reset (← links)
- 05000285/LER-1986-004, :on 860801,smoke Discovered Emanating from Main Generator Isolated Phase Bus Duct.Caused by Overheating Due to Breakdown of Insulation at Flex Link Access Covers. Ducts Reinsulated.New Ground Strap Installed (← links)
- 05000285/LER-1987-012, :on 870413,partial Actuation of Engineered Safeguards Sys Occurred.Caused by Loss of Power to Instrument Bus A.Power Restored to Instrument Bus a & Components Actuated Returned to Alignment (← links)
- 05000285/LER-1986-001, :on 860702,reactor & Turbine Generators Tripped on Low Steam Generator Level After safety-related Inverter Failure.Caused by Loss of 120-volt Ac Instrument Power to Electrohydraulic Control Unit.Power Restored (← links)
- 05000285/LER-1997-014, :on 970831,perimeter Microwave Intrusion Alarm on Zone 2 Received in Security Alarm Stations.Caused by Lack of Attention to Detail on Behalf of CAS & SAS Operators. Alarm Station Operators Involved Retrained (← links)
- 05000285/LER-1997-012, :on 970821,inadvertent Isolation of All Containment Spray Was Discovered.Caused by Operator Error. Operator,Shift Supervisors,Licensed Senior Operators & Licensed Operators Were Disciplined (← links)
- 05000285/LER-1997-011-01, :on 970819,violation of Tech Specs Due to Inoperability of Radiation Monitor Occurred.Caused by Lack of Depth in Evaluation/Review by Station Personnel. Procedures Will Be Revised (← links)
- 05000285/LER-1987-001, :on 870108,error in Surveillance Test Occurred. Caused by Personnel Error.Responsibility for Inoperable Safeguards Equipment Review Transferred to Shift Supervisor. Operations Staff Made Aware & to Be Retrained (← links)
- 05000285/LER-1987-007, :on 870326,incorrect Wiring of Containment post-accident Water Level Transmitter Failed to Give Correct Indication During Surveillance Test.Caused by Technician Error.Procedures Revised (← links)
- 05000285/LER-1987-006, :on 870327,unplanned Actuation of Channel B Containment Pressure High Signal (Cphs) Occurred.Caused When Instrument Tees Left Capped & Cphs Setpoints Exceeded by Technician.Technicians Instructed (← links)
- 05000285/LER-1999-002, :on 980910,inadvertent Ventilation Isolation Actuation Signal Occurred While Maint Was Being Performed. Caused by Switch Failure.Key Switch for RM-062 Has Been Replaced.With (← links)
- 05000285/LER-1987-008, :on 870321,unplanned Loss of All Ac Power Occurred.Caused by Personnel Error.Caution Signs Hung on Transmitters & Info Sent to Operations & Electrical Maint Personnel Re Precautions (← links)
- 05000285/LER-1986-005, :on 861218,performance of ST-CEA-1 F.4 Test Completed 1 Day Beyond Allowed Interval.Caused by Failure to Meet Time Interval Requirement for Test Scheduled on 861208. Guidance Note Incorporated Into ST-CEA-1 (← links)
- 05000285/LER-1988-022, :on 880909,discovered That Special Rept Re Removal of Electric Latching Mechanism for Fire Door Not Issued.Caused by Inadequate Tracking of Maint Orders. Personnel Training Implemented (← links)
- 05000285/LER-1988-017, :on 880708,discovered That Special Rept on Fire Barrier Inoperability,Required by Tech Spec 5.9.3,not Submitted.Caused by Lack of Procedural Responsibilities & Controls for Fire Protection (← links)
- 05000285/LER-1999-001, :on 990203,shutdown TS Entry Occurred Due to AFW Pump Inoperability.Caused by Inadequate Procedure. Procedure IC-ST-IA-3009 Was Corrected to Properly Perform Surveillance Test.With (← links)
- 05000285/LER-1998-016, :on 981204,determined That as Found Configuration of Relays & Covers Did Not Meet Seismic Qualifications for Relays.Cause Cannot Be Determined.Relay Covers Have Been re-installed.With (← links)
- 05000285/LER-1988-027, :on 881020,steamfitter Disabled by Heat Exhaustion After Exiting Steam Generator.Caused by Contamination of Protective Clothing.First Aid Provided & Victim Taken to Hosp for Medical Treatment (← links)
- 05000285/LER-1988-028, :on 881020,failure of YCV-1045A Instrument Air Check Valve.Caused by a Metal Particle Lodged in Valve Seat.Air Check Valve Bench Tested & Successfully Passed (← links)
- 05000285/LER-1987-003, :on 870307,while Performing Main Steam Safety Valve Test,Three Safety Valves Failed to Lift within Plus/ Minus 1% of Nameplate Setpoint.Caused by Normal Drift.Valves Recalibr & Tested (← links)
- 05000285/LER-1987-002, :on 870309,during Hot Shutdown,Engineered Safeguards Sys Received High Radiation Signal Causing Automatic Isolation of Ventilation Sys.Cause Undetermined (← links)
- 05000285/LER-1987-004, :on 870228,discovered That Fire Barrier Penetration Seal Installed W/O Being Assigned Number on Fire Barrier Logs.Cause Not Stated.Seal Loaded & Given Identification Number for Future Insps (← links)
- 05000285/LER-1987-005, :on 870303,unplanned Actuation of Ventilation Isolation Actuation Sys Occurred During Calibr of Monitor RM-061.Caused by Loss of Connection Between Alarm & Monitor. Loss of Connection Found & Repaired (← links)
- 05000285/LER-1988-024, :on 881003,emergency Diesel Generator Automatically Started Due to Apparent Momentary Low Voltage Condition on 4160 Volt Bus.Cause Inconclusive.Circulating Water Pump Restarted & Shutdown (← links)
- 05000285/LER-1986-002, :on 860324,routine Surveillance Tests ST-RPS-8 F.1 & ST-ESF-3 F.1,scheduled for 860225,discovered Inadvertently Missed.Tests Performed on 860324.Personnel Involved Counseled (← links)
- 05000285/LER-1997-017, :on 971107,LPSI Was in Unanalyzed Condition Due to Potential for Voiding.Caused by Architects Failure to Consider Water Hammer in Designs.Administrative Controls Placed to Monitor & Prevent Conditions (← links)
- 05000285/LER-1998-006, :on 980521,outside Design Basis for LOCA with Plant Shutdown Noted.Caused by Lack of Defined Design Basis for Operability Requirements.Procedures & USAR Will Be Updated to Include Operability Requirements.With (← links)
- 05000285/LER-1997-016, :on 971029,nuclear Fuel Was Potentially Outside of Mfgs Fuel Design Criteria.Caused by Fuel Clad Gap Reopening.Gap Reopening May Be Predicted for Fcs,Based on Bounding Analysis (← links)
- 05000285/LER-1997-015, :on 971017,unanalyzed Condition for Station Batteries Was Noted.Caused by Lack of Detailed Plant Design to Provide Supporting Info Re Requirement.Issued Operations Memo (← links)
- 05000285/LER-1998-015, :on 981202,questioned Whether Shift Technical Advisor Position Required to Be Respirator Qualified.Caused by Inadequate Program Design/Description for Establishing. Qualifications Will Be Reviewed.With (← links)
- 05000285/LER-1986-003, :on 860501,radioactive Gas Released to Auxiliary Bldg from Vol Control Tank.Caused by Gaseous Grab Sampling & Inadequate Procedures.Valve LCV-626B Tagged Closed (← links)
- 05000285/LER-1985-008, :on 851003,unplanned Actuation of Ventilation Isolation Sys Occurred.Caused by Torn Filter Paper Allowing Particulate & Gaseous Activity Into Stack Gas Monitor. Filter Paper Repaired (← links)
- 05000285/LER-1985-006, :on 850928,three Main Steam Safety Valves Failed to Lift within 1% of Setpoint Valves During Test. Caused by Normal Drift (← links)
- 05000285/LER-1985-007, :on 851001,unplanned Actuation of Ventilation Isolation Actuation Sys Occurred.Esf Initiated by Containment Stack Radiation Gas Monitor RM-062.Caused by Flow of Containment Air in Ventilation Stack (← links)
- 05000285/LER-1988-011, :on 880327,containment Integrity Lost Because Swagelok Cap on PC-743 Test Tee Removed for Leak Rate Testing Not Reinstalled Until Discovered on 880419.Caused by Inadequate Procedure.Procedure Upgraded (← links)
- 05000285/LER-1988-003, :on 880205,key Control to Very High Radiation Areas Inadequate.Cause Not Stated.Red Health Physics Padlocks Added to Doors Barring Access to Very High Radiation Areas (← links)
- 05000285/LER-1984-015, :on 840702,load Over RCS Suspended from Auxiliary Hook of Polar Crane Violated Tech Spec 2.11(1). Procedure Change Made to RCS Vent & Leak Test Operating Instructions (← links)
- 05000285/LER-1988-032, :on 881101,safety Injection/Containment Spray Recirculation Piping Design Deficiency Noted.Caused by Design Deficiency in Recirculation Header.Miniflow Test of Safety Injection Pumps Performed (← links)
- 05000285/LER-1988-012, :on 880428,discovered That Special Rept on Fire Barrier Inoperability Not Submitted,Per Tech Spec 5.9.3. Caused by Maint Order Not Properly Tracked & Inadequate Procedure Controls.Procedures Changed (← links)
- 05000285/LER-1998-014, :on 981021,emergency Temporary Mod Placed Plant in Unanalyzed Condition Re Ventilation Duct.Caused by Inadequate Procedural Control of Emergency Temporary Mod. Plant Procedures Will Be Revised.With (← links)
- 05000285/LER-1988-031, :on 881029,bus-tie Breaker (BT-1B4C) Tripped Open & de-energized 480 Volt Buses 1B3C & 1B3C-4C.Caused by Excessive Loading of Buses 1B3C & 1B3C-4C.Procedure Change to OI-EE-2B Made to Caution Operators (← links)
- 05000285/LER-1988-014, :on 880518,emergency Diesel Generator D-2 Tripped Resulting in auto-start of Emergency Diesel Generator D-1.Caused by Failure of Fuse.Fuse Replaced (← links)
- 05000285/LER-1988-026, :on 881014,emergency Diesel Generator 2 Automatically Started to Idle Speed.Caused by Personnel Error Compounded by Procedure Inadequacy.Relay Work Scheduled During Bus or Equipment Outages (← links)
- 05000285/LER-1988-023, :on 880928,3 of 10 MSIVs Failed to Lift in Violation of Tech Spec Operability Requirements.Valves Shipped to Independent Testing Lab for Testing & Possible Refurbishment (← links)
- 05000285/LER-1988-030, :on 880929,two Hourly Fire Door Patrols Not Performed.Caused by Security Personnel Being Reassigned to Area Considered to Be of Greater Priority.Security Bulletin Issued & Procedure Revised (← links)
- 05000285/LER-1998-012, :on 980828,inappropriate Approval of Change to H Generation Design Basis Wwas Noted.Caused by Failure to Assess Impact of Proposed USAR Changes.Reviewed & Updated Design Analysis as Needed.With (← links)
- 05000285/LER-1988-013, :on 880509,Channel C Reactor Coolant Low Flow Trip Setpoint Found to Be Out of Tolerance Low.Caused by Failed Power Supply to Trip Unit.Supply Replaced,Unit Returned to Operability & Memo Issued (← links)
- 05000285/LER-1998-013, :on 980924,CR Radiological Dose Consequences Was Noted Outside of Design Basis.Cause Not Stated.Upgraded Radiological Consequences Program & Calculations.With (← links)
- 05000285/LER-1988-006, :on 880315,discovered That Surveillance Test ST-DC-1 F.1, Station Batteries Not Completed During Jan 1988.Caused by Faulty Test Program Design.Test Will Be Manually Scheduled for Same Date Each Month (← links)
- 05000285/LER-1988-005, :on 880309,discovered Condition in Which Specific LOCA Could Incapacitate Instrumentation Feeding Protective Function,Resulting in Loss of Pressurizer Pressure Transmitters Following Spray Break (← links)
- 05000285/LER-1988-019, :on 880816,analysis of Design Basis of Diesel Generator Revealed Circuitry Could Not Be Isolated.Power Breaker to Damper Circuitry Opened & Emergency Control Room Evacuation Procedure Changed (← links)
- 05000285/LER-1988-010, :on 880415,inoperable Check Valves on Safety Injection & Refueling Water Tank Bubblers Discovered.Caused by Inability of Valves to Hold back-pressure as Designed. Check Valves Replaced & New Valves Tested (← links)
- 05000285/LER-1988-018, :on 880704,failure to Conduct Surveillance Test within Prescribed Interval Occurred.Test Performed on 880711.Cause to Be Investigated.Procedure Will Be Revised (← links)
- 05000285/LER-1998-009, :on 980722,waste Disposal Sys CIV Was Noted Outside Design Basis.Caused by Over Reliance on Contractor Design & Review of Mods.Mods Were Completed to Correct Problem.With (← links)
- 05000285/LER-1998-011, :on 980825,violation of TS on Engineered Safety Sys Equipment Operability Occurred.Caused by Lack of Understanding of All Starting Air Circuit Details.Replaced Caution Tags on DG & Control Panels.With (← links)
- 05000285/LER-1988-009, :on 880406,investigation Concluded Identifying Concerns Re Capability of Listed Valves to Perform Design Function During Dba.Efforts Made to Find Alternative Method of Performing Affected Valve Functions (← links)
- 05000285/LER-1998-010, :on 930208,violation of TS Re Better Axial Shape Selection Sys Was Noted.Caused by Inoperability of Core Monitoring Program.Alternate Methods Will Be Evaluated. with (← links)
- 05000285/LER-1988-007, :on 880323,Emergency Diesel Generator D-2 Tripped Resulting in Autostart of Emergency Diesel Generator D-1.Caused by Operator Error.Usar Section 6 Revised (← links)
- 05000285/LER-1988-016, :on 880629,discrepancies Identified in Cycle 11 Setpoint Analysis Affecting Tech Specs Figures 1-3 & 2-6. Caused by Misunderstanding W/Staff.Operations Memo Issued & Proposed Changes to Tech Specs Prepared (← links)
- 05000285/LER-1988-008, :on 870503,12 Spray Heads on Containment Spray Sys Not Inspected Per Surveillance Test ST-NZ-1 within Required Time Interval.Effect of Potentially Disabled Heads on Containment Spray Headers Will Be Evaluated (← links)
- 05000285/LER-1988-015, :on 880621,redundant Component Cooling Water Pump AC-3A Inadvertently Started During Breaker Testing. Pump Shut Down & Control Switch Placed in pull-to-lock Position to Prevent Restarting (← links)
- 05000285/LER-1988-004, :on 880311,determined That Instrument Air Valve PCV-1849 Did Not Meet Containment Isolation Criteria Specified in Updated Sar.Cause Not Stated.Procedure Changes Made to Reflect Need to Close Valve (← links)
- 05000285/LER-1988-005-01, :on 880612,reactor Trip Occurred on Generated lo-lo Steam Generator Level Received from Steam Generator 32.Caused by Failure of Smoothing Orifice Relief Device in Westinghouse Main Turbine.Orifice Repaired (← links)
- 05000285/LER-1988-002, :on 880125,high Pressure Safety Injection Isolation Valve Declared Inoperable.Caused by Failure to Meet Design Criteria for Operability.Temporary Mechanical Jumper Installed to Bypass Air Intensifier (← links)
- 05000285/LER-1988-001, :on 880125,discovered Locked But Improperly Latched Door to Waste Disposal Filtering Room (Very High Radiation Area).Caused by Inadequate Security Check.Changes Made to Radiation Protection Manual (← links)
- 05000285/LER-1997-009, :on 970619,potential Loss of Remote Shutdown Capability Occurred Due to Fire Induced Damage.Caused by Inadequate Design Basis Documentation.Operations Memo Provided Evacuation Criteria (← links)
- 05000285/LER-1997-008, :on 970616,improper Shift Staffing Due to Inadequate Control of Respirator Spectacle Kits Occurred. Caused by Program for Obtaining Corrective Lenses Inadequate to Ensure Compliance w/10CFR.Manual Revised (← links)
- 05000285/LER-1997-005, :on 970530,improper Entry Into High Radiation Area Occurred.Caused by Lack of self-checking & Inattention to Detail.Discussed Event W/Plant Staff & Counseled Individual Involved (← links)
- 05000285/LER-1978-030-01, /01T-0 on 781003:During Oper Check on Auxiliary Steam Driven Feed Pump,The Steam Inlet Valve YCV-1045 Did Not Open Due to Closed Air Supply (← links)
- 05000285/LER-1985-011, :on 851214,loss of All 480-volt Buses,Dc Bus & Two Ac Buses Initiated Safeguard Signals.Caused by Personnel Error & Altered Electrical Distribution Sys Lineup.Power Restored to 480-volt Buses within 15 Mins (← links)
- 05000285/LER-1997-004, :on 970505,DG Was Outside Design Basis Due to Violation of App R.Mod Was Completed on 970507 to Provide Ability to Isolate CR Located Tachometer from DG-2 Speed Sensing Circuit Prior to Reaching 300 Degrees (← links)
- 05000285/LER-1997-006, :on 970606,discovered Loss of All Fire Suppression Due to Inoperability of Fire Pumps.Caused by Atypical Set of Operating Circumstances.Procedures Are Being Modified to Prevent Recurrence of Event (← links)
- 05000285/LER-1985-009, :on 851018,potential nonsingle-failure Proof Circuit Identified.Circuitry for MSIV Will Be Modified.Other Mods Performed During 1982-1983 Refueling Outage Will Be Examined (← links)
- 05000285/LER-1997-002, :on 970414,charging Pump CH-1B Declared Inoperable.Caused by Ineffective Communication Re Amend 125 to TS 2.15.Implemented Improved Procedures Re Submittal of License Amend Requests (← links)
- 05000285/LER-1984-023, :on 841118,19 & 24,radiation Monitor RM-060 Ventilation Isolation Signal Actuated.Caused by Leak of Gas to Auxiliary Bldg.Leak Located & Stopped.Monitor Recalibr & Spray Valve Repaired (← links)
- 05000285/LER-1985-005, :on 850823,during Containment Pressure Reduction,Ventilation Isolation Actuation Sys Actuated. Caused by Technician Error in Repositioning Low/High Setpoint Selector Switch.Personnel Counseled (← links)
- 05000285/LER-1985-012, :on 851210,continuous Fire Watch Not Posted During Halon Sys Inoperability,Per Tech Spec 2.19(8).Caused by Individual Inadequately Briefed Re Responsibilities While Sys Out.Standing Order M-9 Changed (← links)
- 05000285/LER-1985-010, :on 851122,LPSI Pump SI-1A Failed to Start When Given Start Signal from Automatic Sequencer.Caused by Failure of GE Hea Relay Contact.Defective Contact Movable Arm Bent to Make Contact Per GE Maint Manual (← links)
- 05000285/LER-1996-011, :on 961030,containment Closure Breached While Moving Fuel.Caused by Failure to Maintain Valves & Follow & Enforce SO-G-20A Requirements.Rev of Policies & Procedures Re Control & Maint of Containment Closure (← links)
- 05000285/LER-1997-001, :on 970122,main Steam Outside of Design Basis Occurred Due to an Error in Safety Valve Analysis.Guidance Has Been Provided to Operating Staff to Ensure That Design Basis Maintained (← links)
- 05000285/LER-1996-010, :on 961018,loss of Containment Closure Noted Due to Maint Activity During Refueling.Station Procedures Including OI-CO-4,will Be Reviewed & Revised as Necessary to Ensure Adequate Controls Exist (← links)
- 05000285/LER-1996-009, :on 961017,pressurizer Safety Valves as Found Lift Appeared to Be Outside Acceptance Criteria.Caused by Valve Bonnet Upper Temp Limits Not Specified in Test Procedure.Test Procedure Will Be Revised (← links)
- 05000285/LER-1996-008, :on 961011,ventilation Isolation Actuation Signal Occurred.Due to High Containment Activity.Plant Procedures Will Be Reviewed & Revised (← links)
- 05000285/LER-1996-007, :on 961005,unplanned Reactor Protection Sys Actuation Occurred During Plant Cooldown.Caused by Failure to Complete Step in OP-3A as Required.Procedure Revised.W/ (← links)
- 05000285/LER-1996-016, :on 961220,inadequate Procedural Guidance for Resetting an Engineering Safety Feature Identified.Caused by Lack of Depth in Evaluation.Memorandum Was Issued to Notify Operators of Issue (← links)
- 05000285/LER-1996-015, :on 961028,improper Fuel Loading Next to Inoperable Wide Range Nuclear Instrument Occurred.Caused by Inadequate procedures.OP-11 Will Be Revised Before 1998 Refueling Outage to Require Reloading (← links)
- 05000285/LER-1996-014, :on 961117,reactor Cooldown in Excess of Limits Occurred Due to Starting Reactor Coolant pumps.OP-2A & OI-RC-9 Will Be Revised (← links)
- 05000285/LER-1985-004, :on 850620,unplanned Actuation of Ventilation Isolation Actuation Sys Occurred.Caused by Operator Error. Plant Procedures Will Be Reviewed & Clarified.Operator Made Aware & Reinformed on Proper Methods (← links)
- 05000285/LER-1996-013, :on 961116,util Failed to Satisfy Surveillance Requirement for Containment Penetration M-80.Caused by Lack of Complete & Thorough Ca.Review of All Similarly Configured Penetrations Was Conducted (← links)
- 05000285/LER-1996-012, :on 961111,potential for Vaporizing Cooling Water in Containment Fan Cooling Units Occurred.Caused by Loop Coincident with Loca.Analyses Have Been Performed (← links)
- 05000285/LER-1979-017-03, /03L-0 on 790724:during Normal Operation,D Channel Wide Range Nuclear Instrumentation Failed W/Complete Loss of Power.Caused by Blown Main Power Fuses.Fuses Replaced & Instrumentation Placed in Svc (← links)
- 05000285/LER-1996-006, :on 951218,all Charging Pumps Disabled.Caused by Inadequate Administrative Control.Guidance Insuring Consistent Interpretation of Affected TSs Issued.Process for Issuing TS Interpretations Revised (← links)
- 05000285/LER-1993-001, :on 930108,discovered That Bast Level Surveillance Not Performed Properly.Caused by Inadequate Surveillance Test to Monitor Bast Levels.Mod Initiated to Provide Individual Annunciator Windows (← links)
- 05000285/LER-1992-032, :on 921217,Door 1011-4 Declared Inoperable as Fire Barrier Because of Inoperable Latch.Caused by Personnel Error.Training Initiated for Licensed Operators & Security Supervisory Personnel (← links)
- 05000285/LER-1992-030, :on 921130,fire Barrier Penetration 19-E-30 Breached to Support Maint on Ccw/Raw Water Hx.Between 921201 to 02,no Hourly Fire Watch Established.Caused by Lack of Attention to Detail.Personnel Counseled (← links)
- 05000285/LER-1979-019-03, /03L-0:on 791005,during Normal Rotation of Component Cooling Water Heat Exchangers,Inlet Valve Would Not Operate from Control Room Remote Switch.Caused by Failed Plastic Piston Assembly in Actuator.Assembly Replaced (← links)
- 05000285/LER-1992-028, :on 920822,RPS Automatically Tripped Reactor on Thermal Margin/Low Pressure,Causing Increase in RCS Pressure Caused by Failure of Ac to Dc Power Converter in EHC Panel. Power Source Modified & Pressures Adjusted (← links)
- 05000285/LER-1992-027, :on 920817,determined That Open Stop Valve Between Regenerative Heat Exchanger & CH-202 Did Not Conform to Code Requirements.Caused by Inadequate Design Review. Plant Procedures Will Be Reviewed & Revised (← links)
- 05000285/LER-1984-021, :on 841017,sample from Safety Injection & Refueling Water Tank Yielded Low Boron Concentration.Change Made to Test ST-CHEM-1,F.2 to Notify Supervisor When Boron Concentration Falls Below 1,740 Ppm (← links)
- 05000285/LER-1985-003, :on 850321,ventilation Isolation Actuation Signals Occurred.Caused by Increasing Activity Levels as Monitored by Vent Stack Particulate Monitor RM-061.Ion Exchanger Isolated,Decreasing Activity Levels (← links)
- 05000285/LER-1992-010, :on 910517,determined That Room 57 Was Outside Design Basis of Plant.Caused by Lack of Attention to Detail. Completed Engineering Analysis to Evaluate Remainder of as Sys (← links)
- 05000285/LER-1992-019, :on 920531,indication Received That CEA 35 Dropped Into Reactor Core Resulting in Plant Shutdown,Due to Clutch Coil Failure.Util Will Verify Whether Resistor Is Installed in Series W/Cea 35 Clutch Coil (← links)
- 05000285/LER-1985-002, :on 850306,unplanned Actuation of Ventilation Isolation Actuation Signal Occurred.Small Reactor Coolant Leak Identified at Suction of Charging Pump B on 850307. Caused by Degraded Weld.Weld Repaired (← links)
- 05000285/LER-1985-001, :on 850303,ventilation Isolation Actuation Signal by Radiation Monitor RM-060 Occurred.Caused by Gases Released from Liquid Sample Drawn Through Ventilation Hood Into Auxiliary Bldg Ventilation Sys (← links)
- 05000285/LER-1984-025, :on 841207,gaseous Leak in Waste Gas Vent Header Caused Stack Iodine Monitor RM-060 to Initiate Ventilation Isolation Actuation Signal.Leak Located & Stopped (← links)
- 05000285/LER-1996-004, :on 960315,discovered Adequate Shutdown Margin Was Not Maintained.Caused by Inadequate Technical Review by Plant Personnel Involved in Reviewing Procedure Change. Appropriate Personnel Trained on Incident (← links)
- 05000285/LER-1984-024, :on 841126,unplanned Ventilation Isolation Actuation Sys Actuation Occurred.Caused by Operator Changing Ventilation Discharge Duck Monitor RM-061 to High Alert/Alarm Setpoints During Temp Inversion (← links)
- 05000285/LER-1996-002, :on 960329,reactor Manually Tripped Due to Partial Loss of Vacuum in Main Condenser.Condenser Isolated, Plant Shutdown & Leaking Condenser Tube Plugged.Pm Order WP-006820 Will Be Revised (← links)
- 05000285/LER-1996-001, :on 960318,containment Ventilation Isolation Signal Occurred Due to High Activity During Purge.Revised Applicable Procedures (← links)
- 05000285/LER-1984-010, :on 840921,unplanned Actuation of Ventilation Isolation Actuation Signal Initiated by Containment Activity Gaseous Process Monitor RM-051.Caused by Maladjusted Monitor Discriminator Sensitivity.Sensitivity Adjusted (← links)
- 05000285/LER-1984-023-01, :on 841118,19 & 24,five Actuations of Ventilation Isolation Actuation Signal Occurred.Caused by Leaks in Pressurizer Spray Valve & Vent Header.Leak in Vent Header & Valve Located & Repaired (← links)
- 05000285/LER-1992-021, :on 920611,failure to Initiate Fire Watch for Inoperable Fire Door Noted.Caused by Ambiguous Instructions Contained in Note.Procedure Revised & Personnel Informed of Requirements for Maintaining Fire Door (← links)
- 05000285/LER-1992-020, :on 920601,determined That Operators Failed to Obtain Appropriate Grab Samples During Radiation Monitor Inoperability.Caused by Procedural Inadequacies.Procedure Upgraded & Personnel Trained Re Monitors (← links)
- 05000285/LER-1992-014, :on 920514,steam Leak Identified Coming from Capped Connection on Turbine Trip Switch on Moisture Separator,Resulting in Reactor Trip.Caused by Communication Problems.Training Provided & Order Issued (← links)
- 05000285/LER-1992-007, :on 920219,three Ventilation Isolation Valves Closed Unexpectedly.Cause Undetermined.Util Will Provide Training on Event,On Monitoring Alarm Printer & Will Investigate New Training for Operators (← links)
- 05000285/LER-1995-007, :on 951108,potential Tripping of 480 Volt Circuit Breakers W/Digital Reip Units Identified.Caused by Circuit Breaker Component Not Operating as Specified.Issued SA for Operability (← links)
- 05000285/LER-1984-022, :on 841026,during Maint Activities,Temporary Fire Barriers Found Not Meeting Design Criteria.Temporary Barriers Repaired.Insp Expanded to Include Permanent Cable Tray Penetration Fire Barriers (← links)
- 05000285/LER-1992-025, :on 920723,EDG DG-2 Started When Operator Inadvertently Pushed Normal Start Button Instead of Alarm Ack Button.Caused by Failure to self-check to Ensure Action correct.Self-checking Reemphasized (← links)
- 05000285/LER-1992-024, :on 920717,identified Potential for Previous TS Violations Involving Lhr Monitoring Requirements.Caused by Lack of Procedure Covering Monitoring of Key Reactor Physics Parameters.Ts Interpretation Will Be Developed (← links)
- 05000285/LER-1992-023, :on 920703,RPS Automatically Tripped & Power Momentarily Lost to Instrument Bus That Supplies Power to Turbine Electrohydraulic Control Sys.Caused by Failure to Isolate Inverters.Mod to Inverters Underway (← links)
- 05000285/LER-1992-022, :on 920702,discovered That Cables Supplying Power to Three Heater Drain Pump Motors Were Inadequately Sized.Caused by Error in Original Plant Design.Fire Watch Established & Cables Will Be Upgraded (← links)
- 05000285/LER-1984-018, :on 840807,during Routine Weekly Replacement of iodine-collection Cartridge on RM-060,unplanned Actuation of Ventilation Isolation Actuation Signal Occurred.Caused by Personnel Error (← links)
- 05000285/LER-1984-016, :on 840705,stack Noble Gas Monitor RM-062 High Alarm Setpoint Exceeded Limit.Caused by Drift in Alarm Card. Monitor Reclibr to Tech Spec Requirements (← links)
- 05000285/LER-1984-017, :on 840803,unplanned Actuation of Ventilation Isolation Actuation Sys Occurred.Caused by Containment Air Activity Particulate Process Monitor RM-050 Trip.Monitor Discriminator Sensitivity Adjusted (← links)
- 05000285/LER-1992-017, :on 920314,switchgear Revealed Indications of Cracks on Additional Lexan Cam Followers.Caused by Mechanical Stress Cracking of Cam Followers.Switches Have Been Replaced (← links)
- 05000285/LER-1992-015, :on 920412,480-volt Bus Feeder Breaker Tripped, Resulting in Loss of Power to Shutdown Cooling Flow Control Valve Controller.Caused by Failure to Have Policy to Address Event.Policy Developed (← links)
- 05000285/LER-1992-013, :on 920408,actuation of Engineered Safety Feature (ESF) Components Occurred.Caused by Spade Wire Lugs Loosening & Loss of Connection.Maint Procedure Requirements for Terminating Wires Revised (← links)
- 05000285/LER-1995-008, :on 951204,inadequate Trisodium Phosphate Was in Containment Due to Calculation Error.Revised Appropriate Calculations for Future Operating Cycles (← links)
- 05000285/LER-1992-012, :on 920325,determined That SG Differential Pressure/Asymmetric SG Transient Protection Trip Function Setpoints Higher than Allowed by Ts.Caused by Inadequate Program/Methodology.Procedures Revised (← links)
- 05000285/LER-1984-011, :on 840720,stainless Steel Woven Connection from Auxiliary Bldg Ventilation Discharge Duct to Radiation Monitors RM-061/062 Found Disconnected.Caused by Loose Slip Fit Connection.Connector Reattached (← links)
- 05000285/LER-1984-013, :on 840722,trip Signals Received on Channels a & C of Thermal Margin/Low Pressure Reactor Protective Sys Circuits.Caused by Noise Spikes on Calculators.Noise Suppressors Installed (← links)
- 05000285/LER-1984-012, :on 840717,boron Concentration in Safety Injection & Refueling Water Tank Below Tech Spec Limits. Caused by Analytical Error.Boron Concentration Maintained at Higher Level (← links)
- 05000285/LER-1992-011, :on 920320,determined That Valve Arrangement for Svc Air Sys Containment Penetration M-74 Did Not Meet Isolation Criteria for Exposed Sys.Caused by Failure to Address Revised Fsar.Mod Will Be Performed (← links)
- 05000285/LER-1995-006, :on 950824,improper Start of Number 1 DG Caused Rt.Caused by Inadequate Administrative Controls on Critical Parameter.Provided Addl Administrative Controls to Ensure That Governor Was Operated Correctly (← links)
- 05000285/LER-1992-006, :on 920125,discovered That Alarm Function on Radioactive Waste Bldg Stack Monitors Were Inoperable.Caused by Personnel Error.Training Re self-checking & post-mod Testing Requirements Will Be Performed (← links)
- 05000285/LER-1984-014, :on 840703,during Weekly Replacement of Iodine Collection Cartridge on RM-060,actuation of Ventilation Isolation Actuation Sys Occurred.No Cause given.RM-060 Will Be Out of Svc During Filter Replacement (← links)
- 05000285/LER-1991-031, :on 911216,determined That Connections to Personnel Air Lock Bulkheads for Leak Testing Potentially Outside Original Design Requirements.Caused by Lack of Procedures.Danger Tags Hung on Door (← links)
- 05000285/LER-1984-009, :on 840622,penetration Assemblies Failed.Caused by Brittle & Cracked Teflon Insulation on Lead Wires. Selected Penetration Assemblies Modified.Assemblies Remaining Will Be Qualified by Nov 1985 (← links)
- 05000285/LER-1984-008, :on 840516,RCS Leakage Approached 110 Gpm W/Indication of Tube Rupture in Steam Generator B RC-2B. Caused by Igscc.Corrective Actions Contained in (← links)
- 05000285/LER-1984-019, :on 840902,ventilation Isolation Actuation Sys Started.Caused by Operator Error During Changing of Ventilation Discharge Duct Monitor.Monitors Returned to Normal & Sys Reset.Procedures Under Review (← links)
- 05000285/LER-1992-001, :on 920121,alarms That Indicated Loss of 13.8 Kv Electric Sys.Caused by Inadequate Design of RM-041/042 & 043 Sample Pump Motor Control.Sample Pump Restarted (← links)
- 05000285/LER-1984-006, :on 840522,unplanned Actuation of Ventilation Isolation Actuation Sys (Vias) Occurred.Vias Actuation Spurious.Alarm Cleared & Vias Lockout Reset Once Filter Replaced (← links)
- 05000285/LER-1995-005, :on 950824,plant Trip Occurrred Due to Operator Error During Diverse Scram Sys Testing.Required CR Operators to Verbalize Pertinent Label Info Prior to Operating Equipment from CR (← links)
- 05000285/LER-1984-007, :on 840516,during Heatup & Pressurization, Unplanned Actuation of Ventilation Isolation Actuation Sys Occurred.Caused by High Airborne Activity in Containment. Procedure Change Submitted (← links)
- 05000285/LER-1984-005, :on 840502,discovered That 14 Unplanned Actuations of Ventilation Isolation Actuation Signal Which Occurred Between 840101-0502 Reportable.Causes Listed.No Apparent Equipment Malfunctions Identified (← links)
- 05000285/LER-1992-009, :on 920302,lockout Relay on Channel B of Emergency Safeguards Ventilation Isolation Actuation Signal Actuated.Caused by Procedural Deficiency.Procedure Re Lockout Relays Revised & Event Discussed (← links)
- 05000285/LER-1992-008, :on 920227,relief Valves on SI Sys Piping Had Been Installed W/Relief Setpoints Not within SI Sys Design. Caused by Inconsistencies Between Relief Valve Spec Sheets. Drawings & Design Basis Documents Updated (← links)
- 05000285/LER-1992-004, :on 920201,5 of 10 Main Steam Safety Valve Liftpoints Found Out of Acceptance Criteria.Caused by Use of Overly Restrictive Operability Criteria.Valves Recalibr & Tested Satisfactorily (← links)
- 05000285/LER-1992-005, :on 920201,zero Power Mode Bypass Switch Placed in Bypass Condition Resulting in Unplanned Reactor Protective Sys Actuation.Caused by Procedural Noncompliance. Standing Order Re Notification Reviewed (← links)
- 05000285/LER-1992-003, :on 920128,alarm on Fire Alarm Panel AI-54A Actuated as Required by Tech Spec 2.19(1).Caused by Inadequate Personnel Performance Due to Lack of Attention. Compensatory Measures Established (← links)
- 05000285/LER-1992-002, :on 920127,inner Containment Personnel Air Lock Door Failed to Meet Acceptance Criteria of Pal O-ring Seal Surveillance Test.Caused by Condensate Dripping on Inner Door Bracket.Corrosion to Be Removed (← links)
- 05000285/LER-1984-004, :on 840303,reactor Coolant Radioactivity Exceeded Tech Spec Limits.Caused by Iodine Spike Following Reactor Power Change.No Corrective Actions Planned (← links)
- 05000285/LER-1984-002, :on 840303,during Scheduled Refueling Shutdown, Five Main Steam Safety Valves Failed to Lift within +/- 1% of Tech Specs.Caused by Normal Drift of Valve Setting.Test Revised (← links)
- 05000285/LER-1976-005-03, /03L:on 760315,channel 383 Left Pressure Switch A/LC-383-1 Found Drifted Out of Spec.Cause Not Stated. Switch Recalibr & Will Be Checked Monthly for Proper Operation (← links)
- 05000285/LER-1976-006-03, /03L:on 760326,channel B Axial Power Distribution Positive & Negative Limits Read 12.1 & -5.4.Caused by adder-subtractor Module 19-301A Going Into Oscillation & Saturated.Module Replaced (← links)
- 05000285/LER-1976-007-03, /03L:on 760327,channel a Axial Power Distribution Positive Limit Noted to Be 12.1.Caused by adder-subtractor Module 19-301A Going Into Oscillation & Saturated.Module Replaced & Calculator Returned to Svc (← links)
- 05000285/LER-1976-008-03, /03L:on 760329,loss of Power Occurred to 161 Kv/ 4160 Volt House Svc Transformers T1A-3 & 4.Caused by Fault in Offsite 161 Kv Supply.Diesel Generators Started to Verify Operability (← links)
- 05000285/LER-1976-009-03, /03L:on 760320,erosive Wear Found on Raw Water Pump Impellers & Galvanic Corrosion Found in Connecting Threads of Top Case Bearing.Caused by Erosive Nature of Missouri River Water.Impellers Built Up (← links)
- 05000285/LER-1976-010-03, /03L:on 760401,high Power Margin to Trip Meter B Drifted from 4.2% to 6% Power.Caused by Feed Back Limiter Module Found Drifted.Module Calibr & Operated Satisfactorily (← links)
- 05000285/LER-1976-011-03, /03L:on 760407,start on Secondary Air Diesel Required 10.6-s.Caused by Inadequate Procedure.Restart on Secondary Air Required 8.1-s (← links)
- 05000285/LER-1976-012-03, /03L:on 760405,channel B Axial Power Distribution Positive Limit Read 12.1.Caused by adder-subtracter Module 19-301A Going Into Oscillation & Saturated.Module Replaced & Calculator Returned to Svc (← links)
- 05000285/LER-1976-013-03, /03L:on 760413,positive Axial Power Distribution Limit Setpoint Out of Spec in Nonconservative Direction on Channel A.Caused by Random Noise Signals.Minor Circuit Mod Implemented to Prevent Reoccurrence (← links)
- 05000285/LER-1976-014-01, /01T:on 760414,valve HCV-383-4 Failed to Close by Control Switch.Caused by GE Type 7700,Size 1 Combination Breaker/Reversing Starter Failure to Operate Due to Binding Contact.Contact Lubricated & Adjusted (← links)
- 05000285/LER-1976-015-03, /03L:on 760408 & 20,inadvertent Noble Gas Releases to Auxiliary Bldg Occurred Due to Valve leak-by on Chemical & Vol Control Sys.Caused by Leakage by Standby Ion Exchanger CH-8A Isolation Valves (← links)
- 05000285/LER-1976-016-03, /03L:on 760427,primary Air Start Motor for Diesel Generator 2 Failed to Disengage.Caused by Incorrect Airgap Setting.Airgap Properly Set & Generator Successfully Started W/Proper Disengagement (← links)
- 05000285/LER-1976-017-01, /01L:on 760518,no Flow Condition Discovered on Steam Generator Blowdown Radiation Monitors RM-054A & B. Caused by Closed Valve HCV-2508.Valve Immediately Reopened (← links)
- 05000285/LER-1976-018-03, /03L:on 760514,possible Violation of Release Rate for Containment Purge 76A-11 Discovered.Caused by Inaccurate High Reading by Sensitive Spectrometer Sys.Violation Did Not Occur (← links)
- 05000285/LER-1976-019-01, /01T:on 760528,two Main Steam Safety Valves Relieved Due to Setpoint Drift.Caused by Environ Temp Conditions.Valves Reset & Setpoint Returned to Plus or Minus 1% of Nominal Setpoint Value (← links)
- 05000285/LER-1976-020-01, /01T:on 760604,util Notified of Error in Strikin II Computer Code Which Could Result in Reduction of 0.7 Kw/Ft in Allowable Peak Linear Heat Rate.Caused by Representing Guide Tubes as Solid Rods (← links)
- 05000285/LER-1976-021-03, /03L:on 760629,timer Relays for SI-3A,AC-3B & Si-3B Failed to Time Out at Set Times.Caused by Mechanical Binding of Time Relay Model HA-41A6-L-08.Timer Relays Tested Twice Weekly Until Replacements Received (← links)
- 05000285/LER-1976-022-01, /01T:on 760710,river delta-temp Limit of 20F Exceeded.Caused by Failure of Condenser Backwash Valve MOV-A-D4 to Open Electrically After Backwashing Condenser. Backwash Valve Repaired (← links)
- 05000285/LER-1976-023-01, /01T:on 760726,safety Injection Refueling Water Storage Tank Boron Concentration Reduced to 1,825 Ppm. Caused by Valve CH-152 leak-by.Valve Tightened (← links)
- 05000285/LER-1976-024-01, /01L:on 760801,waste Liquid Release Conducted W/Waste Liquid Process Radiation Monitor Inoperable.Caused by Operator Failure to Return Monitor to Operate Position. Operator Orally Reprimanded (← links)
- 05000285/LER-1976-025-03, /03L:on 760815,4,160 Volt Breaker T1B-3B Tripped on Instantaneous Overcurrent Relaying,Deenergizing 4,160/480 Volt Transformer T1B-3B & 480 Volt Bus 1B3B.Caused by Internally Faulted Transformer (← links)
- 05000285/LER-1976-026-03, /03L:on 760815,dc Bus 2 Ground Alarm Annunciated in Control Room & Smoke Observed Coming from Diesel Generator 2 Governor Motor Encl.Caused by RPM Governor Motor Armature Internally Faulted (← links)
- 05000285/LER-1976-027-03, /03L:on 760815,primary Air Start Motor for Diesel Generator 2 (DG) Failed to Disengage After DG-2 Successfully Started.Caused by Drift of Airgap Setting for Magnetic Pickup Unit.Preventive Maint Program Revised (← links)
- 05000285/LER-1976-029-03, /03L:on 760831,reactor Coolant Sampled & Analyses Indicated I-131 Equivalent 2.075 Uci Per Gram.Caused by Power Transient.Numercial Limit Exceeded But All Conditions of Tech Spec Fulfilled (← links)
- 05000285/LER-1976-030-01, /01T:on 760901,discovered High Alarm Setpoint on Steam Generator Blowdown Monitors RM-054A & RM-054B Set at 600,000 Counts Per Minute.Caused by Use of Unofficial Copy of Process Monitor Setpoints (← links)
- 05000285/LER-1976-031-03, /03T:on 760908,portion of Spent Fuel Pool Rack Passed Over Spent Fuel.Caused by Misinterpretation of Tech Specs.Supervisor Re Instructed as to Meaning of Tech Specs (← links)
- 05000285/LER-1976-032-01, /01T:on 761001,weld Leaks Discovered on Controlled Bleed Off Line on Reactor Coolant Pump RC-3C.Caused by Vibration Inducted Fatigue.Welds Will Be Repaired Before Startup (← links)
- 05000285/LER-1991-030, :on 911210,containment Pressure Reduction Not Terminated When Radiation Monitor RM-060 Removed from Svc. Caused by Breakdown in Written & Verbal Communication & Work Practices.Procedures Revised (← links)
- 05000285/LER-1991-029, :on 911202,deficiency Discovered in Personnel Air Lock Leak Rate Testing & Procedure.Caused by Past Inadequate Procedure Change Reviews.All Type B Leak Rate Test Procedures Will Be Reviewed (← links)
- 05000285/LER-1991-028, :on 911201,discovered That Sample Pump for Lab & Radwaste Processing Bldg Exhaust Stack Gas & Iodine Monitors Not Running.Caused by Power Excursion Due to Severe Winter Weather.Design Change Under Review (← links)
- 05000285/LER-1991-027, :Between 911016-1118,abnormal Increases Noted in Reactor Coolant Drain Tank Level.Caused by Opening Test Valve WD-1060 During Sampling.Standing Orders Reviewed & Label Developed for Locked Closed Valves (← links)
- 05000285/LER-1991-025, :on 911114,determined That Upset & Faulted Loadings on Two Safety Injection Sys Pipe Supports Exceeded Design Capacity of Embedded Unistrut.Caused by Design Deficiency.Piping Supports Modified (← links)
- 05000285/LER-1991-024, :on 911106,ventilation Isolation Actuation Signal Received When Electrician Removed Wrong Fuse Block from Control Panel.Caused by Personnel Error.Standing Order Revised Re Pulling Fuses or Lifting Leads (← links)
- 05000285/LER-1991-026, :on 911105,discovered That Senior Reactor Operator Did Not Have Current NRC Medical Exam.Caused by Lack of Single Point Control of NRC Medical Exam Program. Personnel Training Info Sys Upgraded (← links)
- 05000285/LER-1991-023, :on 911022,emergency Response Facilities Computer Sys Taken off-line for Maint Activities & Power Increased to 99.3%.Caused by Failure to Review Appropriate Tech Specs.Precaution Added to Procedure (← links)
- 05000285/LER-1995-004, :on 950602,discrepancy Re Seismic Classification of New Fuel Storage Racks Was Discovered. Caused by Lack of Administrative Control During Parallel Development of Design.Performed Calculation (← links)
- 05000285/LER-1991-022, :on on 911009,evaluation Initiated in Response to 910912 Neutron Flux Channel Concerns,Per Rev 2 to Reg Guide 1.97.Caused by Failure to Follow Procedure PED-QP-5. Memo Issued.Also Reported Per Part 21 (← links)
- 05000285/LER-1991-021, :on 911004,inadvertent Partial Actuation of Containment Isolation Actuation Sys Occurred.Caused by Improper Switch Contact Stackup.Caution Tag Placed on Switch Until Corrective Actions Completed (← links)
- 05000285/LER-1991-020, :on 910919,SG Water Containing Approx 2.25 Lbs of Hydrazine Inadvertently Released to Missouri River.Caused by Failure of Procedure OI-FW-6 to Specify Proper Sequence for Performance of Valve Checklist (← links)
- 05000285/LER-1991-019, :on 910913,approved Procedure Specified Incorrect Position for Valves in Backup Nitorgen Sys.Caused by Inadequate Preparation & Review of 10CFR50.59 SE W/ Procedure Revs.Revised Procedure OI-NG-1 (← links)
- 05000285/LER-1991-018, :on on 910911,0314,0701,0912 & 900311,side Wall Cracks Discovered in Cells of Station Batteries.Caused by Inadequate Design of Battery Cell Terminal Post Seals. Batteries Replaced (← links)
- 05000285/LER-1991-012, :on 910620,emergency Diesel Generator Auto Start Occurred Due to Loss of Transformer.Caused by Personnel Error.Relays Labelled for Proper Identification (← links)
- 05000285/LER-1991-011, :on 910606,mgt Determined Potential Existed for Pressurizer Pressure Instrument Loops to Be Calibrated in Manner Resulting in Inability to Trip Pressurizer Pressure Low Signal within Limits (← links)
- 05000285/LER-1984-003, :on 840314,while Tagging Out Instrument Inverter B for Maint,Switching Error Made,Causing Partial Loss of Dc Power.Breaker Reclosed to Restore Dc Power in Control Room (← links)
- 05000285/LER-1978-046-03, /03L-0 on 781227:during Operation,A Small Leak Developed at Weld on Charging Pump CH-1A Connection to Demineralized Water Line.Caused by Vibration of Piping in Svc.Crack Was Ground Out & Rewelded (← links)
- 05000285/LER-1983-012-03, /03L-0:on 831122,during Performance of Monthly Surveillance Test,Pressure Indicator D/Pic-905 Operated Erratically.Caused by Blown Power Supply Fuse.Fuse Replaced (← links)
- 05000285/LER-1995-002, :on 950327,containment Polar Crane Was Used to Move Reactor Vessel Internals Lift Rig Over Reactor Vessel.Usar & TS Did Not Clearly Identify Containment Closure Requirements.Ca Will Revise USAR (← links)
- 05000285/LER-1983-011-03, /03L-0:on 831111,diesel Generator DG-1 Failed to Field Flash During Surveillance Test.Caused by Damaged Relay Socket & Circuit Rectifying Diodes.Zener Diode Replaced & Regulator Adjusted (← links)
- 05000285/LER-1991-017, :on 910819,potential for Radiological Release Through Safety Injection Refueling Water Tank Vents Identified as Result of Evaluations Prompted by Similar Industry Events (← links)
- 05000285/LER-1983-010-03, /03L-0:on 831031,during Surveillance Test ST-ESF-5,Bliss Eagle Timer S1-1A on Sequencer S1-2 Failed to Time Out within Prescribed Limit.Caused by Dirty Operating Mechanism.Timer Replaced (← links)
- 05000285/LER-1983-008-03, Diesel Generator DG-2 Failed to Flash & Control Room Had No Indication That Diesel Up to Operating Speed.Caused by Failure of Modified Panalarm,Model 70-PCD-25 (← links)
- 05000285/LER-1995-001, :on 950316,time Delay Relays for Offsite Power Low Signal Was Found Out of Tolerance.Caused by Thermal aging.Re-checked Opls Actuation Relays Periodically During Plant Operation to Ensure Setpoint Stability (← links)
- 05000285/LER-1991-016, :on 910711,roll Pin for Diesel Generator Exhaust Damper Linkage Failed.On 910718,crack Discovered in Roll Pin for DG-1 Linkage.On 910802,util Notified That Crack Due to Mfg Defect.Also Reported Per Part 21 (← links)
- 05000285/LER-1991-015, :on 910710,personnel Declared Radiation Monitor RM-060 Inoperable Due to Flow Totalizer,Located Inside Monitor Cabinet,Not Seismically Mounted.Caused by Inadequacies in Design Process (← links)
- 05000285/LER-1991-013, :on 910626,diesel Generator DG-2 Autostarted During Performance of Surveillance Test,Resulting in Tripping & Locking Out Breaker 1AD1.Caused by Human Error. Event Discussed W/Licensed Operator (← links)
- 05000285/LER-1983-009-03, /03L-0:on 831012,channel a Control Room Indicator Associated W/Reactor Coolant Loop RC-2A Flow Failed High. Caused by Intermittently Failing Transmitter Due to Bad Amplifier.Transmitter Replaced (← links)
- 05000285/LER-1991-010, :on 910517,determined That Auxiliary Steam Piping in Upper Electrical Penetration Room 27 Outside Design Basis.Caused by Lack of Attention to Detail During Initial Drawing Review.Fire Dampers Closed (← links)
- 05000285/LER-1984-001, :on 840122,crane Supervisor Left Spent Fuel Pool Area While Key Still in Interlock Bypass Switch in Bypassed Position,Contrary to Tech Spec 2.11(2).Caused by Personnel Error.Event Discussed W/Individual (← links)
- 05000285/LER-1983-007-03, /03L-0:on 830722,reactor Protective Sys Channel B Axial Power Distribution Positive Trip Setpoint Found Out of Spec Tolerance in Nonconservative Direction.Caused by Failure of Dual Potentiometer Module (← links)
- 05000285/LER-1994-010, :on 941114,potential Accident Scenario Identified That Could Result in Inoperability of Both Control Room Ac Units.Caused by Failure to Specify post- Accident CCW Temp & Inadequate Methodology (← links)
- 05000285/LER-1983-004-03, Pressure Switches A/PC-742-1 & A/PC-742-2 Found Initiating/Actuating Above 5 Psig.Caused by Instrument Drift.Switches Recalibr (← links)
- 05000285/LER-1983-013-03, /03L-0:on 831215,during Surveillance Test ST-ESF-3,pressure Switches A/PC-742-1 & A/PC-742-2 Found Inoperable.Caused by Instrument Drift.Switches Recalibr (← links)
- 05000285/LER-1994-007, :on 941007,raw Water Pump Seal Water Supply Outside of Design Basis.Caused by Design Process Prior to Initial Failure to Adequately Address Importance of Seal Water Availability to RW Pump Operability (← links)
- 05000285/LER-1994-011, :on 941228,SR for SG Level Check Was Unsatisfied.Caused by Inadequate Review.Dept Personnel Trained on Event (← links)
- 05000285/LER-1991-014, :on 910629,radiation Monitor RM-054A Discovered Out of Svc.Caused by Personnel Error.Test OP-ST-SHIFT-0001 Revised to Include check-off When All Radiation Monitors Calibrated (← links)
- 05000285/LER-1983-006-03, /03L-0:on 830714,reactor Protective Sys Channel D Axial Shape Index Internal Tilt Pretrip Setpoint Drifted Out of Spec.Caused by Faulty Bell & Howell Dual Potentiometer Module.Module Replaced (← links)
- 05000285/LER-1983-005-03, /03L-0:on 830709,channel B of Reactor Protective Sys Axial Power Distribution Negative Setpoint Observed Fluctuating in Nonconservative Direction.Caused by Failed Bell & Howell Potentiometer Module 384612-001 (← links)
- 05000285/LER-1994-009, :on 941108,inappropriate Use of Auxiliary Bldg Crane Over Irradiated Fuel.Caused by Combination of Inadequate pre-job Briefing.Conveying Mgt Expectations Re Conduct of pre-job Briefings (← links)
- 05000285/LER-1994-008, :on 941108,potential for Raw Water Pump Room Flooding Heavy Load Drop Occurred.Caused by Lack of Depth in Evaluation/Review Associated W/Original Load Drop Analysis. Danger Tag Placed to Restrict Use of HE-5 (← links)
- 05000285/LER-1982-007-03, /03L-0:on 820324,leak Discovered in Copper Tubing Vent Line from Thermal Mixing Valve to Coolant Expansion Tank in Diesel Generator 2.Caused by Crack in Vent Line. Defective Tubing Replaced (← links)
- 05000285/LER-1979-015-01, /01T-0 on 790511:seismic Support Appeared Inadequate for Component Cooling Water piping-to-containment Cooling & Filtering Unit VA-3A.Analyses Indicated That Clamping piping-to-cooling Unit Will Provide Needed Support (← links)
- 05000285/LER-1978-042-03, /03L-0 on 781124:during Shutdown Cooling Interlock Test Noted That PC-105B Was Not Operating.Caused by Valve Closing Relay 94-347/348 Not Being Wired to PC-105B; Inadvertently Disconnected in 1977 (← links)
- 05000285/LER-1978-042, Forwards LER 78-042/03L-0 (← links)
- 05000285/LER-1978-044-03, /03L-0 on 781214:during 1978 Refueling Outage, Certain Surveillance Tests Req by Tech Specs Could Not Be Performed Because of Shutdown Condition.Facil Lic Change 77-11 Submitted to NRC on 781109 to Delete Requirements (← links)
- 05000285/LER-1978-044, Forwards LER 78-044/03L-0 (← links)
- 05000285/LER-1978-043-03, /03L-0 on 781204:during Inspec of Discharged Fuel Assemblies,A Single Fuel Pin Was Observed to Have Failed, Assoc W/Manufacture & Exposure of Present Day Nuc Fuel (← links)
- 05000285/LER-1978-043, Forwards LER 78-043/03L-0 (← links)
- 05000285/LER-1978-031-03, /03X-1 on 780918:during Refueling Outage,D Channel Hot Leg Temp Indication Was Investigated to Determine Cause of 780918 Failure.Failure Caused by Rosemount Model 104VC RTD Having Water in the Pothead (← links)
- 05000285/LER-1978-039-03, /03L-0 on 781122:noted That Level Transmiter for C Channel (C/LT-901) for Steam Generator RC-2A Level Instrumentation Not W/In Specs.Caused by Calibr Drift of Ge/Mac Model 555 Transmitter (← links)
- 05000285/LER-1978-039, Forwards LER 78-039/03L-0 (← links)
- 05000285/LER-1978-037-03, /03L-0 on 781116:during Refueling,All Limitorque Valves Were Inspec for Proper Staking of the Lock Nut on the Motor operator.30 of 65 Valves Exhibited Unstaked Lock Nuts.Lock Nuts Were Staked IAW Manufacturers Instructions (← links)
- 05000285/LER-1978-038-01, /01T-0 on 781127:Diesel Generator 2 Failed to Auto Close Onto the Bus;Breaker Mode Switch Contracts 27-27c Failed to Make Contact.Caused by Contact Failure (← links)
- 05000285/LER-1978-038, Forwards LER 78-038/01T-0 (← links)
- 05000285/LER-1978-037, Forwards LER 78-037/03L-0 (← links)
- 05000285/LER-1978-035-03, /03L-0 on 781113:during Test of Ventilation Isolation Actuation Signal,Lockout 86B1/VIAS Did Not Trip. Cause Unidentified,Since Relay Retested & Found to Be Operating Normally.Relays Will Continue to Be Tested (← links)
- 05000285/LER-1978-035, Forwards LER 78-035/03L-0 (← links)
- 05000285/LER-1978-036-03, /03L-0 on 781101:auxiliary Feedwater Check Valve FW-164 Found to Be Oriented in Wrong Position.Caused by Missing Valve Disk Plate Which Was Subsequently Located & Recovered (← links)
- 05000285/LER-1978-036, Forwards LER 78-036/03L-0 (← links)
- 05000285/LER-1978-034-03, /03L-0 on 781026:repeated Tripping of Stack Particulate Process Monitor.Caused by Trip Set in Accordance W/Tech Specs Table 2-1 at 9.6x10-2,rather than More Conservative Release Rates 2x10-3 (← links)
- 05000285/LER-1978-034, Forwards LER 78-034/03L-0 (← links)
- 05000285/LER-1978-033-03, /03L-0 on 781014:Reactor Coolant Cold Leg Temp Indicator B/122C Failed High Off Scale Because of an Open Circuited Rosemount Model 104VC Rtd.The RTD Will Be Replaced During Present Refueling Outage (← links)
- 05000285/LER-1978-033, Forwards LER 78-033/03L-0 (← links)
- 05000285/LER-1978-032-03, /03L-0:on 781002,during Performance of ST-ESF-5, Timers SI-1B & CH-1B on Sequence S2-2 Failed to Time Out in Prescribed Time Limit.Caused by Stuck Operating Mechanism.Timers Exercised to Fee Mechanism (← links)
- 05000285/LER-1978-026-03, /03L-1 on 780830:Bchannel RPS Variable Overpwr Trip Reset Demand Alarm Actuated & Would Not Reset.Then,Hi Pwr & Thermal Margin/Low Pressure Trip Units Failed,Both Due to Failure of Devar19-601A,18volt Pwr Supply (← links)
- 05000285/LER-1978-029-03, /03L-0 on 780908:Inadvertent Radioactive Gas Release to Atmosphere Caused by Leakage Past Check Valve CH-284,HG-100 & Relief Valve HG-105.Valves Will Be Inspected & Replaced or Repaired During Next Refueling Outage (← links)
- 05000285/LER-1978-026, Forwards LER 78-026/03L-1 (← links)
- 05000285/LER-1978-029, Forwards LER 78-029/03L-0 (← links)
- 05000285/LER-1978-028-03, /03L-0 on 780831:failure of Tri-x Weather Towers 100 Meter Delta-T Sensor Sys to Rept Stability Class Info. Calibrations Revised to Ensure Instruments Detect Subsequent Sensor Sys Failures (← links)
- 05000285/LER-1978-028, Forwards LER 78-028/03L-0 (← links)
- 05000285/LER-1978-030, Forwards LER 78-030/01T-0 (← links)
- 05000285/LER-1983-001-03, /03L-0:on 830119,during Refueling Outage,Setpoint for One Pressurizer Code Safety Relief Valve Found Beyond Tech Specs.Caused by Instrument Drift.Valve Readjusted (← links)
- 05000285/LER-1991-006, :on 910305,fire Detection Zone 6 Alarmed in Control Room & Could Not Be Reset.Caused by Inadequate Administrative Control to Assure Mod to XL-3 Panel Properly Reflected in Procedures.Personnel Trained (← links)
- 05000285/LER-1991-005, :on 910228,steam Generator Pressure Indicator B/PIC-905 Declared Inoperable Due Reading Approx 56 Psig Lower than Normal.Caused by Misinterpretation of Affected Ts.Formal Interpretation Will Be Written (← links)
- 05000285/LER-1994-004, :on 940413,fire Damper Designed to Retain Halon in Cable Spread Room in Event of Fire Was Found Improperly Latched Open.Caused by Personnel Error.Corrective Actions: Event Consequences Related to Personnel (← links)
- 05000285/LER-1990-027, :on 901207,determined That Adequate Compensatory Fire Watch Insp of Door 971-1 in Room 23 Not Conducted & 3 Addl Doors Had step-off Pads Outside Doors. Remedial Training Conducted (← links)
- 05000285/LER-1994-006, :on 940514,failure to Place Charcoal Filter in Svc Prior to Moving Irradiated Fuel Due to Poor Communications.Required on-coming Operators to Participate in Shift Turnover (← links)
- 05000285/LER-1983-003-01, /01T-0:on 830405,Tech Spec Heatup & Cooldown Curves in Use Since Dec 1979 Found to Be 12 Degrees Nonconservative.Caused by Baseline Curve Info Supplied in 1979 Being Inadequately Defined.Curve Being Revised (← links)
- 05000285/LER-1994-005, :on 940427,found That out-of-tolerance Test Results for Snubbers Not Appropriately Addressed Due to Procedural Inadequacy.Snubber Surveillance Test Procedure Will Be Revised (← links)
- 05000285/LER-1990-028, :on 901214,investigation of Unknown RCS Leakage Identified Source as Installed Spare Control Element Drive Mechanism Housing 9.Caused by Lack of Venting Which Caused Igscc.Blank Flanges Installed (← links)
- 05000285/LER-1990-026, :on 901119,pipe Joint at Isolation Valve in Turbine Bldg Instrument Air Header Failed,Resulting in Loss of Instrument Air Pressure & Reactor Trip.Caused by Improper Valve Installation.Joint Repaired (← links)
- 05000285/LER-1982-018-01, /01T-0:on 820917,review of electro-pneumatic (E/P) Valve Positioners Revealed Absence of Analysis or Test Qualification Data for Honeywell Model 67400-023 Positioners.Control Circuit,Solenoid Valves to Be Modified (← links)
- 05000285/LER-1994-002, :on 940308,boric Acid Pump Declared Inoperable Due to Inability to Ensure Reliable Starting of CH-4B Motor. Breaker Replaced W/Appropriate Model Breaker & Breaker for Boric Acid Pump Verified Appropriate (← links)
- 05000285/LER-1994-003, :on 940304,raw Water Pumps Declared Inoperable. Caused by Excessive Sand Accumulation Around Suction Area of Pumps.Frequency of Rotating RW Pumps Increased (← links)
- 05000285/LER-1982-021-03, /03L-0:on 821211,during ST-ESF-3,F.2 Refueling Surveillance test,A/PC-742-1 Pressure Switch Found to Initiate Above Tech Spec.Caused by Instrument Drift.Switch Calibr & Will Be Changed When Replacement Is Available (← links)
- 05000285/LER-1994-001, :on 940211,safeguards Actuation & Reactor Trip Occurred Due to Relay Failure.Containment Pressure High Signal Relay Replaced & Sent for Investigation of Failure Mechanism (← links)
- 05000285/LER-1982-015-03, /03L-0:on 820622,gas Vent Header Containment Isolation Valve HCV-507A Failed to Close Via Control Room Switch.Caused by Stuck Solenoid Valve.Valve Changed (← links)
- 05000285/LER-1993-020, :on 931229,toxic Gas Monitor (Tgm) Rendered Inoperable When Tgm Ran Out of Chemically Impregnated Paper Tape Due to Failure to Complete Procedural Requirements. Briefings Held W/Operating Crews (← links)
- 05000285/LER-1993-019, :on 931209,AFW Pumps Rendered Inoperable Due to Inappropriate Testing Lineup.Surveillance Test SE-ST-AFW-3005 Will Be Revised (← links)
- 05000285/LER-1982-016-03, /03L-0:on 820714,Channel B of Reactor Protective Sys Axial Power Distribution Unit Had Negative Axial Shape Index Setpoint Out of Tolerance.Caused by Setpoint Drift Due to Dirty Contact in Flow Dependent Setpoint Selector Sw (← links)
- 05000285/LER-1993-014, :on 930926,PORV PCV-102-1 Inadvertently Opened During Test.Caused by Improper Valve Maint During 1984 Mod. C/A:Pcv Refurbished & Tested (← links)
- 05000285/LER-1990-023, :on 900921,safety Injection Piping & Relief Valves Were Out of Design Basis (← links)
- 05000285/LER-1993-018, :on 931206,reactor Trip Occurred Due to Turbine Trip on Low Hydraulic Fluid Pressure.Caused by Inadequate Design of ECN 93-162.Configuration of EHC Sys Tubing Corrected (← links)
- 05000285/LER-1993-013, :on 931002,discovered That as-found Lift Setting Pressure of Pressurizer Safety Valve (Psv) RC-141 Outside Specified Lift Setting Acceptance Criterion.Caused by Normal Setpoint Drift.Psv RC-141 Adjusted (← links)
- 05000285/LER-1993-012, :on 930923,identified Condition Involving Five MOVs Having Cables That Were Inadequately Sized Due to Lack of Attention to Detail in Design Package Preparation for 1990 Mod.Thermal Overloads Enabled (← links)
- 05000285/LER-1993-017, :on 931116,time Delay Relays for Offsite Power Low Signal (Opls) Found Out of Tolerence Due to Inadequate Technical Review of Calibr Procedures for Opls Circuitry. Opls Calibr Procedures Revised (← links)
- 05000285/LER-1993-016, :on 931113,CEA Withdrew from Reactor Core & Rod 31 Became Fully Withdrawn.Caused by Lack of Ground Detection Sys for Associated Power Supplies.Ground Detection for CRD Power Supply Installed (← links)
- 05000285/LER-1993-015, :on 931109,emergency Boration of RCS Was Initiated Due to Induced Electrical Noise.Performed Maint on WR Nuclear Instrumentation Channels a & D (← links)
- 05000285/LER-1990-024, :on 901026,discovered Failure to Conduct Hourly Firewatch (← links)
- 05000285/LER-1990-025, :on 900929,determined That Cooling Water Sys Outside Design Basis for post-accident Containment Cooling (← links)
- 05000285/LER-1982-009-03, /03L-0:on 820411,while Exchanging Component Cooling Water Heat Exchangers,Associated Outlet Valves HCV-490B,HCV-491B & HCV-492B Failed to Open.Cause Not stated.HCV-491B Reassembled & Tested (← links)
- 05000285/LER-1982-009, Forwards LER 82-009/03L-0 (← links)
- 05000285/LER-1982-008-03, /03L-0:on 820330,during Performance of ST-FW-1, F.2(b)(6)per Tech Spec 3.9,steam Driven Auxiliary Feedwater Pump Failed to Start.Caused by Back Pressure Trip Lever in Tripped Position.Lever Reset (← links)
- 05000285/LER-1982-008, Forwards LER 82-008/03L-0 (← links)
- 05000285/LER-1982-006-03, /03L-0:on 820323,during Surveillance Test ST-ISI- WD-1,F.1,valve HCV-506A Failed to Close Via Control Room Switch.Caused by Solenoid Valve Malfunction.Solenoid Valve Disassembled,Cleaned & Reassembled (← links)
- 05000285/LER-1982-006, Forwards LER 82-006/03L-0 (← links)
- 05000285/LER-1993-009, Retracts LER 93-009 Re Automatic Start of Both Backup Charging Pumps Due to Spurious Signal & Subsequent Automatic Isolation of Letdown.Event Did Not Involve Train Level ESF Actuation & Not Reportable (← links)
- 05000285/LER-1993-004, :on 930301,confirmed That Channel D Axial Shape Index (Asi) Being Calculated in Reverse Since 921031-930301 Due to Drawing Discrepancies Associated W/Control Channel B. Temporary Mod 92-078 & Standing Order 0-25 Revised (← links)
- 05000285/LER-1993-011, :on 930624,experienced Reactor Trip Due to Loss of Load.Caused by Lack of Proper Job Planning,Lack of Formal Decision Making Process & Incomplete Communications.Training Will Be Provided to Operations Personnel (← links)
- 05000285/LER-1993-010, :on 930611,1 of 14 Halon Cylinders Did Not Meet Min Pressure Acceptance Criteria Listed in Semiannual Switchgear Rooms Surveillance Test.Caused by Failure of Test to Include Necessary Steps.Cylinder Recharged (← links)
- 05000285/LER-1993-008, :on 930520,determined That TS SR Not Satisfied for Stack Flow Indicator,Per Amend 137 Issued on 910307. Caused by Lack of Attention to Detail.Calibr & Functional Test Procedures Developed (← links)
- 05000285/LER-1993-007, :on 930430,unplanned Emergency Generator Start & RT Signal Occurred.Caused by Inadequate Attention to Detail,Labeling of Fuse Drawers,Caution Signs & Training. Labeling & Caution Signs Upgraded (← links)
- 05000285/LER-1993-006, :on 930118,Halon Fire Suppression Sys for Switchgear Rooms Disabled to Allow Repair/Replacement of Halon Sys Piping.On 930427,individual Responsible for Fire Watch Not Present.Individual Relieved of Responsibilities (← links)
- 05000285/LER-1993-002, :on 930122,determined That Current SG LP Signal Block Reset Values Greater than Allowed Ts.Caused by Improper Design.Test Procedures Will Be Revised by 930917 to Specify Desired Value for Block Function (← links)
- 05000285/LER-1990-018, :on 900612,reactor Protective Sys (RPS) Trip Units for Axial Power Distribution Determined to Be Inoperable.Caused by Procedural Deficiencies.Procedure Revised & RPS Surveillance Tests Reviewed (← links)
- 05000285/LER-1990-016, :on 900511,accident Scenarios Identified by Which Auxiliary Feedwater Piping from Discharge of Turbine Driven Auxiliary Feedwater Pump FW-10 Can Be Overpressurized.Caused by Design Deficiency (← links)
- 05000285/LER-1990-015, :on 900507,PORV Variable Setpoints Used for Low Pressure Overpressure Protection Determined to Be Nonconservative for PORV Opening Time.Caused by Design Deficiency.Tech Spec Amend Prepared (← links)
- 05000285/LER-1990-014, :on 900427,investigation Revealed That Component Cooling Water Piping to Reactor Coolant Pump Seal Coolers Could Be Targets of High Energy Line Break.Safety Analysis for Operability Completed (← links)
- 05000285/LER-1990-011, :on 900402,inadvertent Actuation of Pressurizer Pressure Low Signal Occurred While Performing Calibr Procedure.Caused by Inappropriate Action by Technician Involved.Validation of Procedures Reviewed (← links)
- 05000285/LER-1990-007, :on 900228,determined That Several Supports Would Be Overloaded During Seismic Event on Nonsafety Related & safety-related Main Steam Piping.Caused by Design Deficiency.Piping Supports Modified (← links)
- 05000285/LER-1990-009, :on 900316,potential Overpressurization of Auxiliary Feedwater Piping Could Have Occurred During Thermal Expansion of Process Fluid Between Closed Valved. Caused by Design Deficiencies (← links)
- 05000285/LER-1982-005-03, /03L-0:on 820210,at 98% Power,Control Element 24 Inserted Into Core.Emergency Procedure EP-13,CEDM Malfunctions,Implemented & Power Stabilized at 88%.Caused by Erroneous Operating Instruction.Instruction Changed (← links)
- 05000285/LER-1982-005, Forwards LER 82-005/03L-0 (← links)
- 05000285/LER-1982-003, Forwards LER 82-003/03L-0 (← links)
- 05000285/LER-1982-004-03, /03L-0:on 820203,small Quantity of Radioactive Gas/Particulate Released to Auxiliary Bldg During Routine Operation.Caused by Failure of Stack Gas Monitor RM-062 to Alarm at Appropriate Setpoint Due to Faulty Alarm Module (← links)
- 05000285/LER-1982-001-03, /03L-0:on 820111,during Normal Operation,Two Fire Barrier Penetrations Found Nonfunctional.Shift Supervisor Immediately Notified;However,Fire Watch Not Posted.Insp & Supervisor Personnel Instructed on Proper Actions (← links)
- 05000285/LER-1982-001, Forwards LER 82-001/03L-0 (← links)
- 05000285/LER-1982-002-03, /03L-0:on 820114,at 99% Power,Lockout Relay 86B1, Containment Radiation High Signal,Failed to Actuate on Demand by Plant Radiation Monitoring Sys.Caused by Burnt Coil on Lockout Relay.Coil Replaced & Tested Satisfactorily (← links)
- 05000285/LER-1982-002, Forwards LER 82-002/03L-0 (← links)
- 05000285/LER-1981-011-03, /03L-0:on 811113,containment Isolation Valves Opened & Ventilation Process Initiated W/Containment Air Monitor RM-050/051 Inoperable.Caused by Personnel Error. Valves Closed (← links)
- 05000285/LER-1981-011, Forwards LER 81-011/03L-0 (← links)
- 05000285/LER-1981-004-01, /01T-0:on 810430,personnel Air Lock Door Seals Leak Rate Exceeded Allowable Rate.Caused by Mechanical Door Seals Not Sealing Properly.Seals Repaired (← links)
- 05000285/LER-1980-033, Forwards LER 80-033/03L-0 (← links)
- 05000285/LER-1993-005, :on 930422,determined That Incident Reportable in That SIRWT Recirculation Piping Associated w/MR-FC-83-046 Used Between Dec 1986 & 1992 Refueling Outage in Unacceptable Configuration (← links)
- 05000285/LER-1992-029, :on 920416,Radiation Protection Technician Received Unanticipated Intake of Radioactive Matls Due to Deficiencies in Method Used to Change Listed Filters.Maint & Radiation Protection Procedure Revised (← links)
- 05000285/LER-1992-031, :on 921203,steam Leak Developed in Drain Valve in SG Blowdown Processing Sys,Resulting in Automatic Start of Electric Fire Pump FP-1A.Caused by Lack of Sys Control. Equipment Tagging Procedure Revised & Piping Evaluated (← links)
- 05000285/LER-1992-031-01, Forwards LER 92-031-01 Providing Supplemental Info Re Safety Significance Evaluation & Updated Info on Several Corrective Actions (← links)
- 05000285/LER-1993-003, :on 930126,discovered That IST Requirement for Raw Water Pump Not Satisfied.Caused by Inadequate Administrative Controls.Station Engineering Instruction on Surveillance Testing Changed (← links)
- 05000285/LER-1990-010, :on 900327,unplan Attempt Start of Emergency Diesel Generator Occurred While Unit Was in Refueling Shutdown.Caused by Insufficient Guidance in Operating Instructions OI-DG-1 & OI-DG-2 (← links)
- 05000285/LER-1990-008, :on 900306,electrician Was Connecting Leads as Part of Control Room Ventilation Mod & Caused Short Circuit While Working on Energized Circuit.Caused by Electrician Error.Enhanced General Guidelines Issued (← links)
- 05000285/LER-1990-006, :on 900226,unplanned Actuation Occurred in Backup Trip Circuit for 345 Kv Breaker 3451-5.Probably Caused by Physical Disturbance & Resultant Actuation of Relay.Evaluation Will Be Performed (← links)
- 05000285/LER-1990-002, :on 900226,inadvertent Actuation of Containment Isolation Actuation Signal Occurred W/Plant in Refueling Shutdown Condition.Caused by Accidental Actuation of Lockout Relay by Craftsman.Mod Procedure Revised (← links)
- 05000285/LER-1981-010-03, /03L-0:on 811027,D/LC-383-1 Left & Right Switches & D/LC-383-2 Left & Right Switches Found Out of Setpoint Tolerances.Caused by D Channel Level Switches Drifting Out of Calibr for Unknown Reasons.Switches Recalibr (← links)
- 05000285/LER-1981-010, Forwards LER 81-010/03L-0 (← links)
- 05000285/LER-1981-009-03, /03L-0:on 810924,during Shutdown,Cooling Fan/Coil Placed in Svc for Containment Air Cooling.Pressurized Leak Developed When Coil End Plug Blew Out.Caused by Stripped Threads on Loosely Installed Thread End Plug (← links)
- 05000285/LER-1981-009, Forwards LER 81-009/03L-0 (← links)
- 05000285/LER-1981-007-03, /03L-0:on 810706,discovered That Diesel Generator DG-1 Had Not Started Despite Indications of Attempted Starts.Caused by Faulty Speed Sensing Control Unit.Speed Sensing Unit Replaced (← links)
- 05000285/LER-1981-007, Forwards LER 81-007/03L-0 (← links)
- 05000285/LER-1991-004, :on 910212,offsite Power Low Signal Outside Design Basis.Caused by Inadequate Mod Design at Time of Performance of Original Degraded Voltage Analysis. Engineering Analysis EA-FC-91-017 Performed (← links)
- 05000285/LER-1991-002, :on 901209,ventilation Isolation Actuation Signal Generated by High Alarm on Process Radiation Monitor RM-062.Caused by Accumulation of Noncondensible Gases in Sample Piping.Valve Packing Leak Repaired (← links)
- 05000285/LER-1991-001, :on 910109,determined That Containment Tendon Surveillances Performed in 1981 & 1985 Did Not Reflect Guidance in Tech Specs.Caused by Inadequate Administrative Controls.Testing Program Plan Implemented (← links)
- 05000285/LER-1990-022, :on 900907,approx 460 Fire Barrier Penetration seals,60 Fire Dampers & 6 Fire Doors Declared Nonfunctional Per NRC Info Notice 88-004 Due to Lack of Documentation. Plant Outage Required to Implement Repairs/Replacements (← links)
- 05000285/LER-1990-022-02, Forwards LER 90-022-02,providing Updated Total Numbers of Fire Barrier Impairments (← links)
- 05000285/LER-1990-021, :on 900829,inadvertent Reactor Protective Sys Actuation Occurred While Operator Changed Power Source. Caused by Operator Not Following Proper Procedures.Operator Counseled (← links)
- 05000285/LER-1982-020-03, /03L-0:on 821207,during Main Steam Safety Valve Test,Four Main Steam Safety Valves Had Lift Setpoints Out of Tolerance.Caused by Normal Drift of Valves Over Operating Cycle.Valves Readjusted (← links)
- 05000285/LER-1982-020, Forwards LER 82-020/03L-0 (← links)
- 05000285/LER-1982-019-03, /03L-0:on 821024,MSIVs HCV-1041A & HCV-1042A Stopped Three to Four Degrees Off Seat When Signaled to Close.Caused by Binding Between Valve Packing & Shaft. Packings Sprayed W/Penetrant Oil (← links)
- 05000285/LER-1982-019, Forwards LER 82-019/03L-0 (← links)
- 05000285/LER-1991-007, :on 910320,480 Volt Circuit Breaker Coordination Outside Design Basis.Caused by Deficiencies in Original Sys Design.Breaker/Fuse Coordination Study to Be Completed & Problems Will Be Corrected (← links)
- 05000285/LER-1990-005, :on 900223,determined That Spent Fuel Pool Area Charcoal Filtration Unit VA-66 Was Outside Design Basis. Caused by Insufficient Airflow Into Unit.Affected Updated SAR Analysis Will Be Updated (← links)
- 05000285/LER-1990-004, :on 900217,lift Pressures for 6 of 10 Main Steam Safety Valves Found Outside Acceptance Criteria. Caused by Overly Restrictive Operability Criteria.Valves Recalibr & License Amend Submitted to NRC (← links)
- 05000285/LER-1990-003, :on 900216,determined That Auxiliary Feedwater Piping Outside Normal Stress Limits of ASME Code & Design Basis Specified in Updated Sar.Caused by Design Deficiency.Valve Operators Will Be Inspected (← links)
- 05000285/LER-1989-017, :on 890624,internal Valve Component from Check Valve Found Lying on Pump Discharge Vane.Repair or Replacement of Valve Internals Could Not Be Accomplished within Time Requirement of Tech Spec (← links)
- 05000285/LER-1989-024, :on 891221,determined That Containment Spray Pumps & Suction Header Piping Not Constructed for Use as Backup to LPSI Sys for Shutdown Cooling.Caused by Inadequate Review of Assumptions.Firewatch Established (← links)
- 05000285/LER-1989-021, :on 891010,util Informed by C-E of Potential Nonconservative Setpoint in Reactor Protection Sys Thermal Margin/Low Pressure Trip Unit.Caused by Error in Incorporating Transient Setpoint Analyses (← links)
- 05000285/LER-1981-008-03, /03L-0:on 810813,86B/CRHS (Containment Radiation High Signal) Lockout Relay Failed to Actuate When RM-062 Was Placed in Alarm,Resulting in Failure of 86B1/CRHS Relay to Actuate.Caused by Dirt in Relay Latching Mechanism (← links)
- 05000285/LER-1981-008, Forwards LER 81-008/03L-0 (← links)
- 05000285/LER-1981-006-03, /03L-0:on 810624,reactor Protection Sys Nuclear Power Recorder Channel B Trip Setpoints Determined to Be Nonconservative.Caused by Faulty Temp Change Power Calculation Due to Grounded Hot Leg Temp Loop (← links)
- 05000285/LER-1981-006, Forwards LER 81-006/03L-0 (← links)
- 05000285/LER-1990-001, :on 900108,fire Barrier for Wall Between Auxiliary Bldg Rooms 26 & 34 Breached But Hourly Fire Watch Patrol Not Established.Caused by Lack of Sufficient Training for Shift Supervisors.Standing Order Revised (← links)
- 05000285/LER-1989-023, :on 891211,hourly Firewatch Patrol Entered Posted High Radiation Area W/O Meeting Entry Requirements for Area.Briefings on High Radiation Entry Requirements Held for Personnel W/Assigned Dosimetry (← links)
- 05000285/LER-1981-004, Forwards Revised Attachment 3 to LER 81-04 Re Tech Spec 2.01.Since startup,34 Maint Orders Written on Single Pal Door Seal Failures (← links)
- 05000285/LER-1981-005-03, /03L-0:on 810423,dc Sequencer Timers AC-3A (Component Cooling Water Pump) & AC-102A (Raw Water Pump) Failed to Time Out within Prescribed Limit.Cause Unknown Mechanisms Satisfactorily Inspected (← links)
- 05000285/LER-1981-005, Forwards LER 81-005/03L-0 (← links)
- 05000285/LER-1981-003-01, /01T-0:on 810428,MSIVs HCV-1041A/HCV-10242A Failed Closed Upon Loss of All 125 Volt Dc Power Feeding Bus A1-41B.Caused by Damaged Cable on 100 Amp Switch.Switch & Cable Replaced.All Breaker Panel Lugs Checked for Tightness (← links)
- 05000285/LER-1981-003, Forwards LER 81-003/01T-0 (← links)
- 05000285/LER-1980-033-03, /03L-0:on 801227,one of Four Loops Indicating Pressurizer Pressure & Feeding Thermal Margin/Low Pressure Calculator of Reactor Protection Sys Channel & Safety Injection Actuation Channel,Failed Low.Caused by Blown Fuse (← links)
- 05000285/LER-1989-022, :on 890805,change to Surveillance Procedure ST-CEA-1 Became Effective Which Would Have Made Both Emergency Diesel Generators Simultaneously Inoperable During Portion of Test.Change Removed (← links)
- 05000285/LER-1980-028, Forwards LER 80-028/03L-0 (← links)
- 05000285/LER-1980-030-03, /03L-0:801211,diesel Generator 1 Failed to Start on Secondary Air Sys.Caused by Vanes of Air Motor Sticking & Preventing Motors from Turning.Vanes Cleaned & Motors Installed (← links)
- 05000285/LER-1980-030, Forwards LER 80-030/03L-0 (← links)
- 05000285/LER-1980-032-03, /03L-0:on 801210,primary Heat Tracing Circuits Associated W/Piping Between Boric Acid Pump Discharge & MCV-268 Found Inoperable.Caused by Blown Power Supply Fuses. Fuses Replaced (← links)
- 05000285/LER-1980-032, Forwards LER 80-032/03L-0 (← links)
- 05000285/LER-1980-029-03, /03L-0:on 801106,outboard Motor Bearing on Containment Spray Pump SI-3C Motor Found Severely Degraded & Motor Shaft Scored.Probably Caused by Lack of Oil to Bearing.Bearing Replaced & Rotor Shaft Repaired (← links)
- 05000285/LER-1980-029, Forwards LER 80-029/03L-0 (← links)
- 05000285/LER-1980-019-03, /03L-0:on 800904,seismic Pipe Restraints SIS-62 & SIS-7 Were Inadvertently Made Inoperable at Same Time. Restraints Were Being Upgraded in Response to IE Bulletin 79-14.Restraint SIS-7 Was Immediately Made Operable (← links)
- 05000285/LER-1980-019, Forwards LER 80-019/03L-0 (← links)
- 05000285/LER-1980-023-03, /03L-0:on 800908,during Routine Operations,Power to Lockout Relay Coil 86A1/CPHS Was Interrupted.Caused by Electrically Opened Contacts.Contacts Cleaned & Burnished (← links)
- 05000285/LER-1980-023, Forwards LER 80-023/03L-0 (← links)
- 05000285/LER-1989-020, :on 891012,determined That Two of Four Component Cooling Water HXs Simultaneously Inoperable for More than 24 H.Caused by Inadequate Controls Re Return of Equipment to Svc.Standing Order Revised (← links)
- 05000285/LER-1980-021-03, /03L-0:on 800910,transformer T4 of DG-1 Failed. Transformer Feeds Diesel Oil Immersion Heater & Alarm Relays.Caused by Moveable Armature Located on Immersion Heater Contractor.Armature Repaired (← links)
- 05000285/LER-1980-021, Forwards LER 80-021/03L-0 (← links)
- 05000285/LER-1980-028-03, /03L-0:on 801105,while Diesel Generator DG-1 Was Started & Run to Operating Speed,Buzzer Which Tests for DG-1 ready-to-load within 10 Seconds Failed to Sound within Required Time Limit.Cause Unknown.Diesel Retested & Started (← links)
- 05000285/LER-1980-025-03, /03L-0:on 801027,during Power Operation While Completing Repairs on C Charging Pump,A Charging Pump Became Inoperable.Caused by Leak in Weld Joining Sys to Flushing Line.Weld Repaired & Pump Returned to Svc (← links)
- 05000285/LER-1980-025, Forwards LER 80-025/03L-0 (← links)
- 05000285/LER-1980-027-03, /03L-0:on 801027,during Monthly Ac Sequencer Timer Test,Timer FW-6 on Sequencer S1-2 Failed to Time Out within Prescribed Limit.Caused by Sticky Operating Mechanism.Timer Replaced W/Spare (← links)
- 05000285/LER-1980-027, Forwards LER 80-027/03L-0 (← links)
- 05000285/LER-1981-002-01, /01T-0:on 810413,during Normal Operation at 65% Power,Notification Received of Defect in Certain Foxboro Transmitters.Transmitters Have Capacitor Amplifier Which May Fail Due to Heat During Operation or After LOCA (← links)
- 05000285/LER-1981-002, Forwards LER 81-002/01T-0 (← links)
- 05000285/LER-1981-001-01, /01T-0:on 810114,discovered That FT-236 Changing Header Flow Lacks Complete Info to Qualify for Harsh Radiation Svc Required by IE Bulletin 79-01B.Caused by Incomplete Matls List.Transmitter Will Be Replaced (← links)
- 05000285/LER-1981-001, Forwards LER 81-001/01T-0 (← links)
- 05000285/LER-1980-031-03, /03L-0:on 801207,during Normal Operation,Leak Developed in Weld Connecting Demineralized Water Flush Line to Discharge Manifold of Charging Pump.Caused by Probable Piping Vibration.Crack Repaired & Pump Returned to Svc (← links)
- 05000285/LER-1980-031, Forwards LER 80-031/03L-0 (← links)
- 05000285/LER-1980-026-03, /03L-0:on 801030,AB-1 Matrix Relay Failed to Trip Clutch Power Supplies.Caused by Failure of Matrix Circuit to Break Contact.Relay Replaced & Applicable Surveillance Test Performed to Demonstrate Operability (← links)
- 05000285/LER-1980-026, Forwards LER 80-026/03L-0 (← links)
- 05000285/LER-1980-024-03, /03L-0:on 800926,while Completing Repairs on B Charging Pump,A Charging Pump Became Inoperable.Caused by Packing Cooling Pump Failure.Motor Replaced (← links)
- 05000285/LER-1980-024, Forwards LER 80-024/03L-0 (← links)
- 05000285/LER-1980-022-03, /03L-0:on 800911,during Safety Injection Actuation Signal Surveillance test,86B/VIAS Lockout Failed to Trip. Caused by Burned Coil.Coil Replaced W/Spare & Tested Satisfactorily for Proper Operation (← links)
- 05000285/LER-1980-022, Forwards LER 80-022/03L-0 (← links)
- 05000285/LER-1980-020-03, /03L-0:on 800905,axial Power Distribution Setpoints on D Channel Discovered Out of Tolerance in Nonconservative Direction.Caused by Dependent Setpoint Selection Switch Failure.Switch Cleaned & Returned to Svc (← links)
- 05000285/LER-1980-020, Forwards LER 80-020/03L-0 (← links)
- 05000285/LER-1980-017-03, /03L-0:on 800804,during Normal Power Operation, Personnel Discovered Setpoint Selector Switches for RMO-61, Particulate Radiation Monitor,In Wrong Position.Caused by Personnel Error While Performing Test on Radiation Monitor (← links)
- 05000285/LER-1980-017, Forwards LER 80-017/03L-0 (← links)
- 05000285/LER-1980-018-03, /03L-0:on 800808,while Attempting to Monitor Gas Space on Vct,Inadvertent Release of Radioactive Matl to Auxiliary Bldg Environ Occurred.Caused by Deteriorated Surgical Tubing on Gas Analyzer.Tubing Replaced (← links)
- 05000285/LER-1980-018, Forwards LER 80-018/03L-0 (← links)
- 05000285/LER-1988-037, :on 881214,one of Two Supply Headers Supplying Fire Suppression Headers in Auxiliary Bldg Isolated.Caused by Lack of Procedural Guidance & Inadequate Procedural Controls.Standing Order G-58 Will Be Revised (← links)
- 05000285/LER-1989-016, :on 890616,for Unknown Period Since 890614, Auxiliary Feedwater Pump FW-10 Operated Outside Design Basis for Certain Accident Conditions.Caused by Inoperable Speed Control Loop.Action Plan Implemented (← links)
- 05000285/LER-1980-014-03, /03L-0:on 800709,transformer T4 of Diesel Generator 1 Failed.Caused by Shorted Coil.Transformer Replaced (← links)
- 05000285/LER-1980-014, Forwards LER 80-014/03L-0 (← links)
- 05000285/LER-1980-013-03, /03L-0:on 800707,during Normal Power Operation, Noted That Channel a Dc Sequencer SI-1 Had de-energized on-auto Light.Caused by Sequencer Circuitry Failure Due to Faulty Relay (← links)
- 05000285/LER-1980-013, Forwards LER 80-013/03L-0 (← links)
- 05000285/LER-1980-012-03, /03L-0:on 800708,during Performance of ST-RPS-3, F.2,discovered That Trip Unit 3 Setpoints Had Drifted Out of Spec in Nonconservative Direction.Caused by Normal Setpoint Drift.Setpoints Adjusted (← links)
- 05000285/LER-1980-012, Forwards LER 80-012/03L-0 (← links)
- 05000285/LER-1980-015-03, /03L-0:on 800710,during Insp,Noted That Trip Unit Setpoints on C Channel Had Become Positive Rather than Negative.Caused by Failure of 15-volt Power Supply for Trip Unit 4.Unit Calibr (← links)
- 05000285/LER-1980-015, Forwards LER 80-015/03L-0 (← links)
- 05000285/LER-1989-019, :on 890924,indication of High Temp for Reactor Coolant Pump RC-3A Upper Motor Thrust Bearing Received in Control Room.Caused by Damaged Cable for Bearing Resistive Temp Device.Damaged Cable Replaced (← links)
- 05000285/LER-1989-012, :on 890502,main Feedwater Isolation Valve to Steam Generator a Found Inoperable Due to Improperly Set Torque Switch.Caused by Inadequate Program for Maint of Motor Operated Valves.Torque Switches Reset (← links)
- 05000285/LER-1980-007-01, /01T-0:on 800430,penetration Cable Splices for Containment Ventilation Fans Found to Lack Documentation for LOCA Qualification.Splices Will Be Coated w/LOCA-qualified Sealant (← links)
- 05000285/LER-1980-007, Forwards LER 80-007/01T-0 (← links)
- 05000285/LER-1980-016-03, /03L-0:on 800621,weld on Suction Side of Pump CH-1B in Demineralized Water Flush Line Cracked.Caused by Vibration of Piping in Svc.Crack Was Ground Out & Rewelded Using Certified Procedure & Line Tested (← links)
- 05000285/LER-1983-001-03, /03L-0:on 830119,during Refueling Outage,Setpoint for One Pressurizer Code Safety Relief Valve Found Beyond Tech Specs.Caused by Instrument Drift.Valve Readjusted (← links)