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List of results

• 05000352/LER-1988-023, :on 880610,emergency Svc Water (ESW) Pump Start Occurred During Relay Calibr.Caused by Procedure Inadequacies.Esw Pump C Secured 1 Minute After Auto Start. Procedure Revised to Prevent Sys Interaction  + (00:43:35, 27 June 2025)
• TAC:65224  + (00:45:58, 27 June 2025)
• NUREG-0933, Discusses 350th ACRS Meeting on 890608-10 Re Resolution of Generic Issue 128, Electrical Power Reliability. Generic Issue 128 Identified in NUREG-0933, a Prioritization of Safety Issues, Rev 5,Mar 1987  + (00:49:25, 27 June 2025)
• 05000313/LER-1989-010-01, :on 890516 & 17,daily RCS Unidentified Leakrate Determination Indicated That Leakage Increased from Previous Day.Root Cause Not Positively Know.Visual Insp Indicated Possibility of Pinhole.Reactor Shutdown  + (00:54:23, 27 June 2025)
• 05000313/LER-1989-022, :on 890120,RCS Backleakage Occurred Through failed-open Check Valve Resulted in Design Temp of Hpis Piping Being Exceeded.Caused by Failure of Support Designer to Use Correct Load.New Support Replaced  + (00:54:31, 27 June 2025)
• 05000333/LER-1988-009, :on 881021,personnel Found Part of One Unit Cooler in Reactor Bldg Ventilation Sys Blank Flanged Out of Svc.Caused by Procedure Deficiencies.Unit Coolers Restored to Operable Status by Correcting Deficiencies  + (00:55:38, 27 June 2025)
• ML20245A463  + (00:56:08, 27 June 2025)
• 05000029/LER-1987-003, :on 870218,reactor Scram on High Main Coolant Pressure Occurred.Caused by Procedure Inadequacy.Manual Load Reduction Requirement Removed from Immediate Action of Procedure & Stationary Gripper Coil Replaced  + (00:56:40, 27 June 2025)
• 05000313/LER-1989-019-01, :on 881209,emergency Feedwater Initiation & Control Sys Actuation Occurred on Indicated Low Water Level. Caused by Personnel Error.Memo Issued Describing Event & Recognition of Need for Valve Use Emphasized  + (00:56:57, 27 June 2025)
• NUREG-1226, Comments on Supporting Document for Advanced Reactor Policy Statement (NUREG-1226).Advanced Reactors Should Be Designed W/Attention Given to Human Factors Considerations in Early Design Stages in Order to Enhance Human Performance  + (00:57:07, 27 June 2025)
• 05000352/LER-1989-032-01, :on 890513,RWCU Isolation Occurred on Nuclear Steam Supply Shutoff Sys Group III Channels a & D High Differential Flow Isolation Signal.Caused by Sys Equipment Malfunctions.Isolation Reset  + (00:57:12, 27 June 2025)
• ML20245A279  + (00:57:25, 27 June 2025)
• 05000313/LER-1989-005, :on 890201,calculated Reactor Shutdown Margins Less Conservative than Assumed in Design Basis.Caused by Personnel Error Resulting in Inadequate Procedure.Reactivity Balance Procedure Revised  + (00:57:40, 27 June 2025)
• 05000369/LER-1989-010-02, :on 890515,station Mgt Personnel Determined That Main Feedwater & Auxiliary Feedwater Isolation Valves Were Potentially Inoperable.Caused by Mfg Deficiency.Valves Closed & Power Removed  + (00:57:51, 27 June 2025)
• 05000341/LER-1989-008, :on 890316,emergency Equipment Cooling Water Sys Actuated During Surveillance.Caused by Personnel Error. Accountability Meeting Held Between Personnel Involved & Mgt.Potential Design Change Will Be Evaluated  + (00:58:24, 27 June 2025)
• 05000293/LER-1986-007, :on 860322,unplanned Isolation of Primary Containment Isolation Sys Occurred Resulting in Closure of Eight MSIVs & Main Steam Inboard Drain Valve.Caused by Loose Electrical Neutral Connections on Logic Relays  + (00:58:29, 27 June 2025)
• 05000000/LER-1985-083-01, Forwards LER 85-083-01.Rept Contains Safeguards Info  + (01:05:05, 27 June 2025)
• 05000245/LER-1986-018, :on 860524,automatic Actuation of Reactor Protection Sys Occurred During Withdrawal of Source Range Monitor (Srm).Caused by Chattering SRM Drive Relays.Drive Relays Replaced by Relays W/Arc Suppression  + (01:05:25, 27 June 2025)
• 05000344/LER-1988-035, :on 881010,discovered That Surveillance of Gaseous Radwaste Oxygen Monitor Not Performed on Schedule. Caused by Personnel Error & Inadequate Training & Means to Differentiate Between Data  + (01:05:39, 27 June 2025)
• 05000000/LER-1985-078-01, Forwards Revised LER 85-078-01 Re Physical Security Event  + (01:09:09, 27 June 2025)
• TAC:52786  + (01:09:34, 27 June 2025)
• TAC:46149  + (01:09:48, 27 June 2025)
• 05000000/LER-1985-035, Forwards LER 85-035-00 Re Physical Security Event  + (01:09:56, 27 June 2025)
• TAC:44104  + (01:11:41, 27 June 2025)
• 05000317/LER-1989-007-01, :on 890317,identified Bent Vertical Support for Piping Restraint on Shutdown Cooling Portion of LPSI Suction Piping.Caused by Slamming Shut of LPSI Pump 12 Discharge Check Valve.Restraint Replaced  + (01:13:12, 27 June 2025)

• 05000483/LER-1988-013, :on 881029,discovered That Raychem heat-shrink Terminations for Steam Generator C Not Installed in Environ Qualification Configuration.Caused by Incomplete Installation Procedures & Inadequate Training  + (01:15:59, 27 June 2025)

• TAC:42218  + (01:16:32, 27 June 2025)
• TAC:08291  + (01:16:43, 27 June 2025)
• 05000482/LER-1988-021, :on 881025,containment Cooling Fan Inoperability Occurred Due to Motor Overcurrent Condition. Cause Under Evaluation.Motor Replaced W/Qualified Motor  + (01:18:05, 27 June 2025)
• TAC:11348  + (01:19:31, 27 June 2025)
• TAC:07811  + (01:26:11, 27 June 2025)
• 05000327/LER-1987-042, :on 870414,condition Adverse to Quality Rept Initiated Re Start of Fire Pumps During Loca.Caused by Design Error.Fire Pumps to Be Placed Under Administrative Controls to Allow Manual Start Only  + (01:29:28, 27 June 2025)
• 05000382/LER-1987-022, :on 870814,automatic Start of Train B Control Room & Fuel Handling Bldg Emergency Filtration Units Occurred.Caused by Mechanical Binding of Relay Operating Mechanism.Evaluation of Reliability Underway  + (01:33:58, 27 June 2025)
• 05000346/LER-1996-008, :on 961113,switchyard Circuitry Was Declared Inoperable Due to Switchyard Breaker Alignment.Caused by Misunderstanding of Design & Operability Requirements of Switchyard.Performed Required Breaker Alignment Checks  + (01:34:07, 27 June 2025)
• 05000413/LER-1998-015, :on 980805,TS Required Shutdown & Operation Prohibited by TS Associated W/Ice Condenser,Was Initiated. Caused by Lack of Procedural Guidance.Flow Channels Cleared, Foreign Matl Removed,Dented Baskets Repaired  + (01:35:03, 27 June 2025)
• 05000336/LER-1997-020, :on 970423,noted Failure to Verify Boron Injection Flow Path.Caused by Failure to Properly Incorporate TS SRs Into Plant Surveillance Procedures.Will Revise Appropriate Surveillance Procedures  + (01:36:12, 27 June 2025)
• 05000334/LER-1998-026, :on 980623,noted Failure to Perform IST of RHR & CCR Valves,Per Ts.Caused by Failure of IST Program to Properly Identify Required Testing of Subject Valves.Will Review & Revise IST Program & Procedures  + (01:37:07, 27 June 2025)
• 05000334/LER-1997-035, :on 971017,small Bore Piping Support Design Deficiencies Were Identified.Caused by Inadequate Original Design.Comprehensive Evaluation Performed  + (01:37:27, 27 June 2025)
• 05000458/LER-1986-005, :on 860107,fire Protection Water Curtain Inadvertently Actuated Overloading Floor Drian Sys.Caused by Const Employee Mistaking Solenoid Actuation Switch for Door Latch.Switch Properly labeled.W/870909 1tr  + (01:37:55, 27 June 2025)
• 05000213/LER-1987-015, :on 870814,temporary Loss of Power to Spent Fuel Pit Cooling Sys & Bldg Crane Occurred.Caused by Personnel Error.Corrective Measures Include Better Training & Increased Supervisory Involvement  + (01:44:10, 27 June 2025)
• 05000327/LER-1985-031, :on 850729,auxiliary Bldg Isolation Occurred Due to High Radiation Levels from Cracked Chemical & Vol Control Sample Line Weld.Caused by Fatigue of Metal in Weld. Brace Will Be Installed by Next Outage  + (01:44:26, 27 June 2025)
• 05000245/LER-1987-001-01, :on 870113,insp on All Model 4160 Vac Load Ctrs Revealed Cracking Along Horizontal Noryl Insulators. Caused by GE Mfg Defect.Plant Replaced Cracked Insulation W/Bayblend Insulation to Preclude Recurrence  + (01:44:35, 27 June 2025)
• 05000413/LER-1986-048, :on 860824,containment Purge Sys Automatically Isolated on Three Separate Occasions.Caused by Defective Procedure.After Each Isolation,All Areas of Containment Sampled & New 1EMF39L Setpoints Calculated  + (01:45:05, 27 June 2025)
• TAC:59607  + (01:45:11, 27 June 2025)
• 05000327/LER-1987-049, :on 861201,significant Condition Rept Initiated Due to Lack of Assurance That Motor Overloads Would Allow Starters to Perform safety-related Action W/O Uncertainty. Caused by Const Deficiency.Mods Underway  + (01:45:17, 27 June 2025)
• 05000000/LER-1986-026, Partially Deleted LER 86-026-00:on 861124,vital Area Door Discovered W/O Alarm Capability.Caused by Personnel Error. Secutiry Officer in Question Terminated & Function of Administrative Sergeant Reviewed  + (01:45:18, 27 June 2025)
• 05000414/LER-1987-021, :on 870727,condensate Transient Occurred Resulting in Reactor Trip.Cause Unknown.Work Request Originated to Identify Possible Equipment Malfunction Which Could Have Caused Reactor Trip  + (01:46:01, 27 June 2025)
• 05000000/LER-1986-015, Partially Deleted LER 86-015-00:on 860428,stationary Side of Door Failed to Alarm When Tested.Cause Withheld.Alarm Repaired  + (01:46:04, 27 June 2025)
• 05000369/LER-1987-033, Informs That LER 87-33 Due on 880108 Delayed Due to Unresolved Concerns & Will Be Submitted on 880129  + (01:46:10, 27 June 2025)
• 05000259/LER-1987-019-01, :on 870806,testing Required to Satisfy Tech Spec 3.11.A.9 Re Fire Protection Sys Capability,Not Completed.Caused by Vibration Problems W/One Test Hydrant. Hydrant Replaced.Test Completed on 870820.W/870904 1tr  + (01:56:08, 27 June 2025)
• 05000219/LER-1986-034, :on 861229,reactor Manually Scrammed Due to Inability to Maintain Condenser Vacuum.Caused by Equipment Failure & Cooldown in Excess of Tech Spec Limit.Failed Relief Valve & Expansion Joint Replaced  + (01:57:34, 27 June 2025)