05000336/LER-1989-007, :on 890613,condensate Polishing Facility Radiation Monitor 2-CND-RE-245 Operated W/O Source Check. Caused by Personnel Error.No Corrective Action Taken as Check Added to Procedure Before Violation
05000364/LER-1989-004, :on 890419,refueling Containment Integrity Breached During Fuel Movement When Packing Removed from Valve (Chemical Injection to Steam Generator 2A).Caused by Personnel Error.Personnel Counseled
05000219/LER-1997-011, :on 970815,determined Certain Isolation Relay Contacts Were Not Functionally Tested as Required by Tss. Caused by Inadequate Testing Procedure.Revised Procedure to Incorporate Required Contact Testing
05000353/LER-1999-005-02, :on 990712,PCIV Isolation & Esfa Occurred Due to Blown Fuse.Caused by Mechanical Failure of Cold Solder Joing.Reset Isolation within Three Hours & 22 Minutes & Replaced Fuse
05000317/LER-1998-001, :on 980104,Unit 1 Entered Condition Outside of Tech Specs Due to Having Both Secondary Control Element Assembly Position Indications out-of-svc.Caused by Position Indication Being Inoperable.Procedure Revised
05000366/LER-1998-004-04, :on 981005,condition Prohibited by TS Was Noted.Caused by Personnel Error.Coached Involved Personnel & Briefed Other Technicians on Event.With
05000315/LER-1986-004-01, :on 860228,evaluation of Noncompliance Rept Concluded Potential Loss of safety-related Electrical Equipment Due to Improper Application of Motor Control Ctr Reversing Starter Transformers.Reportable Per Part 21
05000316/LER-1978-862-03, /03L-0 on 780613:during Mode 1 Oper AB Emergencey Diesel Generator Was Inoper from 2110 Hours on Available.Due to Defective Diodes.(Encl to
05000298/LER-1997-003, :on 970423,primary Containment Vent & Purge Sys & Simultaneous Opening of Inlet Purge & Outlet Exhaust Lines Was Determined.Caused by Procedural Noncompliance. Procedure 2.2.6.0 Was Revised
05000443/LER-1997-005, :on 970314,misposition of Main Steam Line Radiation Monitors Was Discovered.Caused by Human & Misjudgement Errors.Design Change Was Implemented to Relocate MSLRMs Approx 24 Inches Upstream
05000327/LER-1997-005-01, :on 970319,two of Six Tested Main Steam Safety Relief Valves Not within TS Setpoint Tolerance.Appropriate LCOs Entered & Valves Found Outside TS Setpoint Tolerance Adjusted to within TS Tolerance & Retested
05000336/LER-1997-007-02, :on 970308,inadequate Surveillance Procedure Used for Verifying Operability of RCS Vents.Caused by Failure to Incorporate TS SRs Into Plant Surveillance Procedures.Revised Surveillance Procedure
05000266/LER-1996-015, :on 961231,main Steam Safety Valve Lift Setpoints Exceeded Design Basis Values.Caused by Lack of Margin Provided in Original Analysis.Ist Safety & Relief Valves Will Be Reviewed
05000440/LER-1993-001, :on 930109,RWCU Isolation Occurred as Result of High Differential Flow.Caused by Design Deficiency Associated W/Sys Voiding Phenomenon.Operators Currently Being Retrained & TS Change Request Submitted
05000269/LER-1996-009, :on 960806,engineering Evaluation Discovered Error Existed in Calibr Procedure for Letdown Storage Tank Level Instrumentation for Units.Root Cause & Corrective Action Will Be Addressed in Supplemental Rept
05000423/LER-1996-011-02, :on 960512,determined That Both Trains of CR Envelope Pressurization Sys Inoperable Due to Imbalance in air-conditioning Sys.Cr air-conditioning Sys Rebalanced.W/
05000327/LER-1996-004-02, :on 960509,normal Feeder Breaker Unexpectedly Tripped,Resulting in Loss of Power Signal & Start of Four Dgs.Caused by Failure of Breaker Mechanism.Spare Breaker Operating Mechanism Refurbished & Installed
05000328/LER-1984-012-02, :on 840710,during Surveillance Testing for External Piping Leakage,Both RHR Sys Trains Inoperable When Valve HCV-74-34 Opened.Cause Not Stated.Procedure Change Issued
05000298/LER-1995-010, :on 950413,unanalyzed Condition Discovered During Closeout of RHR Min Flow Valve Design Change (DC) 94-332.Caused by Improper Review of Previous DC 76-2.Util Implemented DC 94-332
05000382/LER-1995-002-03, :on 950610,C Phase Lightning Arrestor on Substation Transformer & RT Occurred Due to Low Departure from Nucleate Boiling Ratio.Extinguished Fire & Placed Plant in Safe Condition
05000280/LER-1984-006-01, :on 840301,as Result of Snubber Functional tests,69 of 226 Snubbers Failed to Meet Acceptance Criteria. Cause Not Stated.Snubber Program Revised & Associated Procedures Reviewed
05000266/LER-1995-004, :on 950328,loss of Voltage Relays Not Calibr to TS Limits.Caused by Review of Setpoint Changes from Temporary Values to Permanent Was Less than Adequate.Ts 15.3.0 Was Entered at 0703
05000336/LER-1994-035, :on 941102,discovered That Roving Fire Watch Established for Breached Electrical Penetration When Requirement for Continuous Fire Watch.Caused by Personnel Error.Continuous Fire Watch Established
05000324/LER-1994-002, :on 940117,spurious Div 1 RCIC Isolation Signal Received,Closing Inboard Steamline Isolation Valve 2-E51-F007.Cause Unknown.Steam Leak Detection Sys Will Be Replaced During Refueling Outage
05000327/LER-1991-004, :on 910306,limiting Condition for Operation Occurred When More than One Rod Position Indicator Per Bank Indicating Greater than Twelve Steps Lower than Normal. Failed Circuit Board Replaced
05000271/LER-1991-003, :on 910227,missed Diesel Fire Pump Fuel Oil Surveillance.Caused by Inadequate Procedure.Review of Chemistry Dept Tech Spec Surveillances & Training for All Chemistry Dept Personnel Being Performed
05000269/LER-1982-016-01, /01T-0:on 821018,internal QA Audit Revealed That Engineering Safeguards Surveillance Tests Not Performed During Jan 1982.Caused by Administrative Deficiencies & Personnel Error.New Sys Established & Personnel Counseled
05000325/LER-1978-074-03, /03L-0 on 780911:during Monthly 1 Diesel Generator Load Test,It Was Found That 1 Cylinder Was Not Firing,Due to Faulty Fuel Pump
05000285/LER-1993-019, :on 931209,AFW Pumps Rendered Inoperable Due to Inappropriate Testing Lineup.Surveillance Test SE-ST-AFW-3005 Will Be Revised
05000352/LER-1993-017, :on 930705,discovered Condition Prohibited by TS in Special Rept for Inoperable Seismic Monitoring Sys Not Submitted in TS Time Period.Caused by Misinterpretation of TS Limiting Conditions.Procedures Revised
05000344/LER-1982-007, Updated LER 82-007/01T-0:on 820514,during Review of Revised Containment DBA Analysis,Nonconservative Spray Modeling Error Identified in Model Used to Justify Tech Spec 3.6.1.4 Re Max Positive Containment Operating Pressure
05000245/LER-1990-015-01, :on 900914,reactor Scram Occurred on Low Reactor Water Level After Feedwater Regulating Valves Began to Close
05000499/LER-1993-007-01, :on 930310,determined That Control Room Envelope HVAC Sys Was Not in Mode of Operation Required by TS 3.7.7a & 3.3.3.7b.Caused by Implementation & Use of Computer Program.Review Will Be Performed
05000324/LER-1981-072-03, /03L-0:on 810827,while Performing HPCI Sys Isolation Instrumentation Steam Leak Detection Calibr, PT 2.10.3PC,steam Line Area Differential Temp Switch Failed to Calibr.Caused by Failure to Follow Calibr Procedure
05000321/LER-1981-074-03, /03L-0:on 810720,main Stack Offgas Flow Recorder Found Inoperative.Caused by Component Failure Due to Several Transistor Failures in Each Flow Measuring Unit.Components Replaced & Units Recalibr
05000255/LER-1979-009-01, /01X-1 on 790220:design Review Indicated Butterfly Valves May Not Close Under Accident Conditions.Caused by Vague Purchase Specs Which Did Not Include Requirements for Closing Against Pressure
05000529/LER-1989-009, :on 890712,reactor Trip Occurred on Calculated Low DNBR Due to Low Reactor Coolant Flow.On 890713,portion of Main Feedwater Sys Overpressurized.Caused by Failed Fuse in Potential Transformer.Fuse Replaced
05000397/LER-1989-011, :on 890502,determined That Eight Valve Motors Did Not Meet Plant Commitment Made in Response to IE Circular 81-13.Caused by Less than Adequate Design Basis Documentation.Plant Mod Request Revised
05000389/LER-1999-007, :on 990610,unplanned Cooldown Transient Occurred Due to Personnel Error.Trained & Briefed Personnel & Revised Procedures.With
05000293/LER-2015-006, Regarding Ultimate Heat Sink and Salt Service Water System Declared Inoperable
05000327/LER-2013-001, Regarding Latent Design Input Inconsistencies Adversely Affect Probable Maximum Flood Analysis
05000446/LER-2008-001, Re Reactor Trip Due to a Sheared Condenser Vacuum Instrument Sensing Line
05000237/LER-2004-006, Regarding Main Turbine Generator Rotor Cracks
05000333/LER-1998-001, :on 980128,invalid Isolations of Reactor Building Ventilation & Associated Actions,Occurred.Cause Not Determined.Revised Procedure ODSO-34 to Ensure That Prior Independent Reviews of TS Performed
05000341/LER-1994-006, :on 940903,discovered That SRMs & IRMs Inoperable During Core Alterations.Caused by Cable Connectors Becoming Separated Due to Stress.Procedure 82.000.04 Will Be Modified