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List of results

• 05000302/LER-1989-022, :on 890614,during Engineered Safeguards Surveillance,Observed Indications That Both Main Feedwater Pumps Had Tripped.Cause Not Conclusively Determined. Precaution Will Be Added to Procedure  + (22:01:00, 26 June 2025)
• 05000293/LER-1988-017, :on 880608,crack Discovered in Yoke Portion of RHR Sys Loop B Valve.Caused by High Stress Levels Due to Yoke Design,Fabrication Defects & Excessive Application of Motor Operator Thrust.Valve Yoke Repaired  + (22:21:25, 26 June 2025)
• 05000313/LER-1988-024, :on 881219,DHR Sys Inboard Suction Valve Closed,Resulting in Loss of DHR Sys Flow.Caused by Inadvertent Jarring of Panel Housing Control Relays for Suction Valve.Caution Label Placed on Panel  + (22:26:38, 26 June 2025)
• 05000245/LER-1987-029, :on 870724,standby Gas Treatment Inoperability Identified During Refueling Operations.Caused by Personnel Error.Design Change Implemented During 1989 Refueling Outage  + (22:28:04, 26 June 2025)
• 05000293/LER-1989-024, :on 890726,automatic Actuation of Outboard RWCU Sys Portion of Primary Containment Isolation Control Sys Occurred.Caused by Trip Signal from Outboard RWCU Sys Flow Sensor.Testing Planned for Addl Data  + (22:28:21, 26 June 2025)
• 05000312/LER-1988-010, :on Four Occasions Between 880719-28,fire Wraps Removed from Conduit B-40034 Without Required Firewatch. Caused by Miscommunication Between Plant Mods Group & Fire Protection Coordinator.Hourly Firewatches to Be Conducted  + (22:34:09, 26 June 2025)
• NUREG-0783, Safety Evaluation Supporting Amends 67 & 49 to Licenses NPF-11 & NPF-18,respectively  + (22:35:27, 26 June 2025)
• 05000219/LER-1988-022, :on 881002,power to 4,160 Volt Bus 1D Was Lost When Breaker 1D Tripped & Locked Out Due to Ground Fault. Caused by Isolated Defect in Cable Insulation.Cable Replaced  + (22:43:26, 26 June 2025)
• 05000255/LER-1984-021, :on 840915,primary Coolant Pump P-50C Shut Down Due to Failure of All Seals Except Vapor Seals.Caused by Failure to Torque Impeller Bolts Properly.Procedures for Assembly of Pump Upgraded  + (22:44:14, 26 June 2025)
• 05000312/LER-1988-005, :on 880315 & 22,steam/water Transients Caused Relief Valves to Lift & Result in Discharge of Water from Letdown Sys to Reactor Bldg Sump.Caused by Pressure Spike Due to Acceleration Slug of Water  + (22:44:22, 26 June 2025)
• NUREG-1201, Forwards Proposed Commission Policy Statement on Integrated Scheduling of Plant Mods,Proposed Commission Paper & Supporting Info,For CRGR Consideration  + (22:46:18, 26 June 2025)
• 05000327/LER-1987-030, :on 890620 & 0704,four Standby Diesel Generators Started Due to Blown Fuse in Remote Emergency Start Circuitry & 125 Volt Dc Vital Battery Board Ii.Caused by Defective Fuse.Fuses Replaced  + (22:49:19, 26 June 2025)
• TAC:54010  + (22:53:25, 26 June 2025)
• 05000328/LER-1988-013, :on 880316 & 17,rod Group Demand Position Indication Not within +/-2 Steps of Demand Position Per Tech Tech Spec 3.1.3.3.First Event Caused by Demand Step Counter Circuitry Failure & Second by Internal Binding  + (22:57:18, 26 June 2025)
• 05000440/LER-1986-059, :on 860908,discovered That Div III Diesel Generator Inoperable for Approx 12 H W/O Required Tech Spec Actions Being Performed.Caused by Control Room Operators Error.Operators Counseled  + (23:13:02, 26 June 2025)
• 05000461/LER-1989-030, :on 890715,scram Signal Initiated When RHR Shutdown Cooling Valves Opened,Decreasing Reactor Water Level.Caused by Failure to Repair Seat Leakage Promptly. Maint Work Request to Repair Valve Performed  + (23:17:15, 26 June 2025)
• 05000382/LER-1989-014, :on 890718,discovered That Plant Operated in Condition Prohibited by Tech Specs Re Cooling Water Valves. Caused by Inadequate Review of ASME Section Xi.Concluded That Valves Operable  + (23:18:32, 26 June 2025)
• 05000416/LER-1988-012, :on 880518,unit Tripped on APRM Neutron Flux High Signal.Caused by Spike to Grounding Strap for Plant Security Fence Located on Roof of Turbine & Control Bldgs. Grounding Strap Relocated  + (23:20:54, 26 June 2025)
• 05000456/LER-1988-021-01, :on 880926,verified That Monthly Target Axial Flux Surveillance Not Performed.Caused by Personnel Error & Lack of Administrative Controls.Reduced Power to Less than 90% & Calculated New Target Values for Delta I  + (23:32:39, 26 June 2025)
• 05000324/LER-1988-001, :on 880102,manual Reactor Protection Sys Trip (Scram) Initiated Due to Decreasing Condenser Vacuum. Definite Root Cause Not Identified.Contractor Svcs Retained  + (00:15:32, 27 June 2025)
• 05000457/LER-1988-024, :on 880921,turbine Trip Occurred When Steam Generator 2C Experienced High Level Oscillation.Caused by Design Deficiency in man-machine Interface.Engineering Evaluation Will Be Performed  + (00:16:19, 27 June 2025)
• 05000382/LER-1989-007, :on 841218 & 890331,inadequate Design of Air Accumulators Allowed Plant to Operate in Unanalyzed Condition Since Initial Startup.Caused by Inadequate Review of Design Requirements.Accumlators Modified  + (00:17:42, 27 June 2025)
• 05000416/LER-1988-004, :on 880112,RWCU Sys Isolation Occured While Operators Prepared to Secure One of Two Operating RWCU Pumps.Caused by RWCU Sys Susceptibility to Perturbations at Reactor Pressures Less than 100 Psig.Procedure Changed  + (00:20:02, 27 June 2025)
• 05000267/LER-1988-009, :on 880506,reactor Scram on High Hot Reheat Temp Occurred Following Trip of Helium Circulator B.Caused by Malfunction of Analog Averaging Instrument in Overall Plant Control Sys.Calibr Method Revised  + (00:24:55, 27 June 2025)
• 05000029/LER-1988-008, :on 890517,loss of Generator Field Excitation Resulted in Automatic Turbine Governor Response & Subsequent Relay Action Tripping Breakers BK-1 & BK-2.Caused by Failure of Field Overvoltage Protection Circuit Board  + (00:25:29, 27 June 2025)

• 05000440/LER-1988-017, :on 880506,unexpected Scram of Group 3 Control Rods During Monthly Reactor Protection Sys Channel Test Occurred.Cause Not Readily Identified.Blown Fuse Replaced & Current & Voltage Monitored While Testing  + (00:26:00, 27 June 2025)

• 05000293/LER-1986-005, :on 860307,operator Discovered Water on Floor in Torus Room.Caused by Leak Resulting from Entrapped Air in RHR Sys.Head Spray Piping Cut & Capped.Procedures Revised to Provide Filling & Venting Instructions  + (00:26:11, 27 June 2025)
• 05000293/LER-1986-009, :on 860411,leakage Indicated Through 1001-68B Check Valve & in-series Containment Isolation Valves MO-1001-28B & MO-1001-29B.Caused by Degradation of One Containment Isolation Valve & RHR Seating  + (00:26:29, 27 June 2025)
• TAC:56104  + (00:30:32, 27 June 2025)
• TAC:54737  + (00:32:37, 27 June 2025)
• 05000322/LER-1987-029, :on 870903,determined That Results of Local Leak Rate Test Exceeded Tech Spec Limits.Caused by Seat to Disc Leakage.Corrective Actions Included Flushing Lines, Restroking Valve & Replacing Gasket  + (00:33:46, 27 June 2025)
• 05000322/LER-1989-005, :on 890321,leakage Discovered During Local Leak Rate Test Due to Normal Valve Degradation.Three Valves Repaired & Retested W/Acceptable Results & Fourth Valve Scheduled for Repair  + (00:40:09, 27 June 2025)
• 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)