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List of results

• 05000317/LER-1987-007, :on 870401,mgt Decided to Shutdown Facility from 100% Power,Mode 1 Operation,To Mode 5 (Less than 200 F).Extensive Insp Program Undertaken to Look in Detail at Equipment within Scope of 10CFR50.49  + (03:08:56, 27 June 2025)
• 05000271/LER-1987-003, :on 870724,resident Inspector Noted That Calibr Procedure for Toxic Gas Monitor Chlorine Analyzer Did Not Satisfy Tech Spec Setpoint Requirements.Caused by Procedural Inadequacy.Calibr Procedure Revised  + (03:08:57, 27 June 2025)
• 05000413/LER-1986-057, :on 861024,determined That 53 Valves Motor Actuator Torque Switches May Have Been Set Incorrectly. Caused by Design,Mfg & Const/Installation Deficiency. Actuators Reset  + (03:09:06, 27 June 2025)
• 05000302/LER-1987-007, Extends Projected Due Date for Suppl to LER 87-007-00 from 870730 to 871030.Extra Time Needed for Satisfactory Analysis of Event  + (03:12:33, 27 June 2025)
• NUREG-1265, Forwards Agenda for NRC Research Meeting on Core Melt Progression Scheduled for 870901-03,NUREG-1265 & NUREG/CR-4883.W/o NUREGs  + (03:13:06, 27 June 2025)
• TAC:59646  + (03:13:12, 27 June 2025)
• 05000327/LER-1987-039, :on 870710,potential for Single Failure of Main Control Room Normal Pressurization Sys Observed.Root Cause & Proposed Corrective Action Under Investigation.Suppl to Rept Will Be Submitted by 871204  + (03:14:10, 27 June 2025)
• 05000333/LER-1987-011, :on 870728,electrical Conduit Fire Barriers Not Sealed W/Three H Fire Rated Seal.Caused by Use of Incomplete List of Fire Barrier Penetrations.Three H Fire Seals in Unsealed Penetrations Installed  + (03:16:44, 27 June 2025)
• 05000483/LER-1986-030, :on 860909,reactor Trip on Loop Low Flow Signal Occurred.Caused by Failure of Equalization Valve to Close During Restoration of Flow Transmitter to Svc.Work Request Written to Replace Manifold Valve  + (03:18:32, 27 June 2025)
• 05000424/LER-1987-070, :on 871123 & 1203,surveillance of Quadrant Power Tilt Ratio within Max Allowable Time Extension Missed by 35 & 3 Minutes,Respectively.Caused by Control Room Supervisor Error.Personnel Counseled  + (03:19:56, 27 June 2025)
• 05000302/LER-1997-025-02, Provides NRC W/Results of SW Study Florida Power Committed to Send Prior to 980828,in LAR & LER 97-025-02,dtd 980708 for Info Only  + (03:20:30, 27 June 2025)
• TAC:L30812  + (03:21:41, 27 June 2025)
• 05000341/LER-1987-042, :on 870902,control Ctr HVAC Sys Shifted to Chlorine Mode W/No Chlorine Present.Cause Unknown. Availability & Design of Less Radio Frequency Sensitive Detectors Under Study.Radio Use Restricted  + (03:24:57, 27 June 2025)
• 05000458/LER-1987-030, :on 871118,failure to Perform Temp Monitoring on Reactor Plant Component Cooling Water Sys Areas,Per Tech Spec 3.7.8 Discovered.Investigation of Cause Inconclusive. Surveillance Test Procedures Revised  + (03:26:03, 27 June 2025)
• 05000293/LER-1998-018, :on 980722,noted That EDGs Were Inoperable Due to Ambient Air Temp Exceeding 88 F.Caused by Inadequate EDG Cooling & Bldg Ventilation Design.Will Develop EDG Cooling & Bldg Ventilation Mods W/Regard to Exceedance of Site Temp  + (03:27:09, 27 June 2025)
• TAC:M99207  + (03:27:55, 27 June 2025)
• 05000285/LER-1998-009, :on 980722,WDS CIV Was Noted Outside Design Basis.Caused by Inadequate Design Interface W/Existing Sys. HCV-500A Was Repaired,Tested & Returned to Service on 980626  + (03:31:16, 27 June 2025)
• 05000336/LER-1998-005, :on 980318,HELB Deficiencies for Piping Inside Containment Was Noted.Caused by Inadequate Consideration of HELB Requirements.Rept Was Submitted to NRC Discussing Applicability of leak-before-break Methodology  + (03:33:31, 27 June 2025)
• 05000302/LER-1987-029, :on 871118,determined That Monthly Surveillance for Liquid Process & Effluent Radiation Monitors Not Performed & Three Surveillances Exceeded by One Day.Caused by Personnel Error.Personnel Instructed  + (03:33:34, 27 June 2025)
• 05000341/LER-1996-005, :on 960327,declared EECW Inoperable & TS Required Shutdown Commenced Due to Design Issue.Design Mod Implemented to Provide SR make-up Sources for Both make-up Water & Nitrogen to EECW make-up Tank  + (03:34:32, 27 June 2025)
• 05000293/LER-1997-025, :on 971123,completion of Required Shutdown Was Noted Due to Two Inoperable Msivs.Cause of Failure of Vessel Flange Thermocouples Could Not Be Conclusively Determined. Rv Flange Thermocouples Will Be Restored  + (03:35:00, 27 June 2025)
• 05000424/LER-1987-067, :on 871116,room Temp Reading of Auxiliary Bldg Room 110 Not Taken Per Tech Specs.Caused by Shift Supervisor Failure to Recognize Importance of Readings.Personnel Involved Counseled  + (03:35:30, 27 June 2025)
• 05000213/LER-1987-018, :on 871120,motor-operated Valves Determined Not to Be in Qualified Configuration Declared Inoperable Due to Grease Installed in Motor Housing.Caused by Inadequate Maint Procedure & Technical Info  + (03:36:06, 27 June 2025)
• 05000289/LER-1998-007, Forwards LER 98-007-00, Inoperable Intake Screen & Pump House Floor Drain Check Valves Due to Lack of Preventive Maint & Periodic Insps, Per 10CFR50.73.Rept Was Evaluated & Determined Reportable on 980720.W/o Encl  + (03:36:33, 27 June 2025)
• 05000327/LER-1987-073, :on 871110,determined That Centrifugal Charging Pumps May Not Start Using Manual Handswitch & May Not Be Available to Mitigate Consequences of Postulated Accident. Caused by Inadequate Review of Design Info  + (03:56:58, 27 June 2025)

• 05000361/LER-1998-015, :on 980717,non-isokinetic Sampling of Airborne Effluent Streams Occurred.Caused by Personnel Error. Procedures Revised  + (03:59:44, 27 June 2025)

• 05000327/LER-1987-072, :on 871110,ESF Equipment Room Coolers Inadequate to Maintain Temps within Environ Qualification Profiles.Caused by Inadequate Design Control Program.Duct Work to Be Revised & Filtration Sys Installed  + (04:00:16, 27 June 2025)
• 05000352/LER-1987-023, :on 870611,ESF Actuated Due to Failure of Battery Charger 1A1D103.Caused by Failure of Integrated Circuit Controller Card.Undervoltage Relays Mfg by Brown Boveri Corp Will Be Replaced  + (04:00:17, 27 June 2025)
• 05000454/LER-1998-005, Forwards Revised LER 98-005-00 Which Corrects Errors Involving Incorrect LER Number on Pages 2 Through 5.No New Commitments Made within Submittal  + (04:00:22, 27 June 2025)
• TAC:53416  + (04:02:55, 27 June 2025)
• 05000304/LER-1985-029, :on 851201,purge Isolation Occurred.Caused by Spurious Spike on Monitor 2RT-PR09C Due to Voltage Spiking on Ac Power Feed to Monitor.Permanent Ac Line Filter Will Be Installed on Power Feed for Monitor  + (04:04:58, 27 June 2025)
• 05000456/LER-1996-010-01, :on 960821,noted Failure to Comply W/Design Basis.Caused by Degradation of Boraflex in Spent Fuel Racks. Implemented Controls on SFP Boron Concentration & Silica Concentration  + (04:05:13, 27 June 2025)
• ML20237A951  + (04:05:25, 27 June 2025)
• TAC:M99205  + (04:06:00, 27 June 2025)
• 05000298/LER-1987-024, :on 871106,HPCI Turbine Overspeed Trip Mechanism Failed to Automatically Reset During Testing Due to Binding of Tappet Assembly.Trip & Reset Function Checked Periodically Until Actions Received from GE  + (04:07:11, 27 June 2025)
• 05000352/LER-1998-015, :on 950216,discovered That Error in Calibr of CS Internal Line Break Detection Instrumentation Resulted in Setpoints Being Outside Required TS Limit.Recalibr Affected Instrumentation to Account for Change in Baseline Dp  + (04:09:22, 27 June 2025)
• CLI-98-12, NRC Staff Comments on Schedule in Light of Commission Policy Statement on Conduct of Adjudicatory Proceedings (CLI-98-12).* Informs That Only Schedular Changes Necessary as Described in 980707 & 09 Comments.W/Certificate of Svc  + (04:10:43, 27 June 2025)
• 05000461/LER-1998-024, :on 980708,failure to Perform Surveillance Testing on Div II Voltage Relays within Specified Frequency of TS Was Noted.Cause of Event Is Under Investigation.Util Expects to Issue Rev to Rept by 980907  + (04:11:05, 27 June 2025)
• 05000302/LER-1986-001, :on 860101,failure of Reactor Coolant Pump a (RCP) Resulted in Reactor Trip and Emergency Feedwater Initiation.Caused by Failure of RCP Shaft.Rcp Shaft Replaced  + (04:11:26, 27 June 2025)
• 05000458/LER-1987-028, :on 871106,RHR Pump Tripped.Caused by High Differential Temp Condition Probably Due to Lack of Ventilation.Root Cause Undetermined.Rhr Pump Room Unit Cooler Returned to Svc  + (04:14:21, 27 June 2025)
• 05000374/LER-1985-010-02, :on 850215,CRD Hydraulic Control Unit Accumulator Pressure Switch Failures Occurred.Caused by Setpoint Drift.Low Pressure Accumulators Recharged & Accumulator Pressure Switches Recalibr  + (04:14:40, 27 June 2025)
• 05000413/LER-1998-012, :on 980706,entered TS 3.0.3 Due to Inoperability of Both Trains of CR Ventilation.Caused by Improper Sys Isolation.Properly Secured Damper in Closed Position & Will Revise Applicable Damper Procedures  + (04:15:11, 27 June 2025)
• 05000413/LER-1985-053, :on 850729,diesel Generator 1A Battery Charger Inoperable Due to Blown Fuses.Caused by Design Deficiency, Personnel Error & Procedural Deficiency.Fuses Replaced & Charger Returned to Svc  + (04:22:13, 27 June 2025)
• 05000413/LER-1987-039, :on 871102,motor Driven Auxiliary Feedwater Pump 1B Started Automatically Due to Loss of Both Main Feedwater Pumps.Caused by Simultaneous Implementation of Two Nuclear Station Mods.Pump Secured  + (04:22:16, 27 June 2025)
• 05000498/LER-1987-013, :on 871102,control Room Ventilation Actuation to Recirculation Mode Due to Inadvertent Switch Operation. Caused by Personnel Error.Const Personnel Reinstructed & Caution Tag Added to Disconnect Switch  + (04:26:41, 27 June 2025)
• 05000361/LER-1998-013, :on 980708,control Room post-LOCA Dose Was Noted Outside Design Basis.Caused by Inadequate Original Calculations & Leakage Terms.Ler Will Be Revised When Calculations Complete  + (04:26:56, 27 June 2025)
• 05000341/LER-1987-048, :on 871008,channel Check for Reactor Protection Sys Drywell High Pressure Instrumentation Omitted in Surveillance Procedure.Caused by Incomplete Surveillance Procedure.Procedure Revised  + (04:27:10, 27 June 2025)
• 05000344/LER-1987-034, :on 871102,redundant Emergency Diesel Generator (EDG) Not Demonstrated Operable within 1 Hr After Removing EDG from Svc.Caused by Personnel Error.Personnel Counseled & EDG B Demonstrated Operable  + (04:32:57, 27 June 2025)
• 05000327/LER-1986-015, :on 860407 & 09,failure to Properly Functional Test Reactor Coolant Pump Devices & Electrical Breakers Noted.Caused by Inadequate Test Procedure.Procedure Revised to Ensure Use of Proper Test Techniques  + (04:33:03, 27 June 2025)
• 05000416/LER-1998-004, Forwards Corrected Copy of LER 98-004-00 to Include Page 1 of 4.LER Discusses Containment Penetration Being Opened Contrary to Ts,Per Requirements of 10CFR50.73  + (04:46:49, 27 June 2025)
• 05000327/LER-1987-065, :on 871023,ERCW Screen Wash Pumps Omitted from ASME Section XI Test Program Resulting in Potential Degradation of ERCW Flow.Caused by Personnel Error.Test Program Revised to Include Wash Pumps  + (04:50:05, 27 June 2025)