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This page provides a simple browsing interface for finding entities described by a property and a named value. Other available search interfaces include the page property search, and the ask query builder.
List of results
- 05000458/LER-1988-011, :on 880503,containment Isolation Valve Discovered to Be Inoperable for Time Greater than Allowed by Tech Specs.Caused by Torque Arm Key Fallen Out of Keyway. Valve Repaired & Personnel Instructed + (19:47:09, 26 June 2025)
- 05000423/LER-1998-002, Informs of Revised Completion Date to Complete Commitment Contained in LER 98-002-00, Verification of ECCS Piping Full of Water Per TS 4.5.2.b.1 Not Being Met. New Commitment Made by Util,Encl + (19:47:26, 26 June 2025)
- 05000423/LER-1998-016, :on 980223,potential Air/Gas Intrusion in Chemical & Volume Control Sys Was Noted.Caused by Inadequate Initial Design.No Cause for Corrective Actions Because Both Flow Paths Were Operable + (19:47:29, 26 June 2025)
- 05000317/LER-1989-015, :on 890822,determined That Calculations Used to Determine That Dousing Sys for Containment Iodine Filters Not Required to Be Environmentally,In Error.Justification for Continued Operation Will Be Established + (19:47:30, 26 June 2025)
- 05000423/LER-1997-060, :on 971209,ineffective Implementation of PASS Program Was Noted.Caused by Failure of Mgt to Implement Effective PASS Program That Ensured Compliance W/Ts.Pass Has Been Incorporated Into Millstone Maint Rule as (a)(1) Sys + (19:47:45, 26 June 2025)
- 05000266/LER-1988-008, Informs That Mod to LER 88-008-00 Would Provide Redundant Feedwater Termination in Event of Main Steam Line Break Inside Containment.If Mod Not Completed on Unit 2 During Fall Outage,Mod Will Be Delayed Until Fall 1990 Outage + (19:49:46, 26 June 2025)
- 05000368/LER-1984-018, :on 840618,Train B of Sodium Hydroxide Addition Sys Discovered Inoperable During Monthly Surveillance Test. Caused by Personnel Error.Administrative Procedure Revised to Provide Clarification + (19:50:20, 26 June 2025)
- 05000368/LER-1986-016, :on 860617,pressurizer Low Pressure Trip Remained Bypassed at Pressure Greater than Allowed.Caused by Personnel Error Resulting in Inadequate Procedure.Plant Protection Sys Calibr Procedures Revised + (19:50:34, 26 June 2025)
- TAC:53962 + (19:51:10, 26 June 2025)
- TAC:L30887 + (19:52:06, 26 June 2025)
- 05000293/LER-1997-012-01, Forwards LER 97-012-01,re Failure of Relay to Energize During Surveillance Test.Commitment Made within Ltr,Listed + (19:52:33, 26 June 2025)
- 05000424/LER-1988-025, :on 880731,lightning Struck Containment Bldg, Resulting in Reactor Trip.Caused by Electrical Surge from Lightning Strike Shutting Down Computers.Circuit Board in Security Sys Backup Computer Replaced + (19:53:48, 26 June 2025)
- 05000254/LER-1987-025, Forwards Addl Info Re Control Room Habitability to Support Narrative Contained in LER 87-025 (Rev 1),including Control Room Habitability Study,Updated FSAR (Rev 88),inplace Charcoal Absorber Leak Rate Testing & Calculations + (20:00:36, 26 June 2025)
- TAC:00344 + (20:02:18, 26 June 2025)
- 05000309/LER-1988-005, :on 880523,potential Harsh Environ Postulated for Unqualified Solenoid Valves.Emergency Operating Procedures Revised to Manually Isolate Vent Lines Following Safety Injection Actuation Signal + (20:04:00, 26 June 2025)
- 05000368/LER-1987-002, :on 870213,discovered Degraded Fire Barriers Due to Installation of Improper Seal Matl in Seismic Gap Separating Adjacent Bldgs.Caused by Inadequate Instructions During Const Phase.Fire Watch Established + (20:04:11, 26 June 2025)
- 05000413/LER-1987-037, :on 870909,two Broken Pipe Supports Noted on ITT-Grinnell mini-stiff Pipe Clamps & Metal Strap Wrapped Around Pipe.Caused by Mfg Deficiency.Straps Replaced W/Heat Treated Strap.Also Reported Per Part 21 + (20:06:41, 26 June 2025)
- 05000498/LER-1997-009, :on 970902,MSSVs 7430A & 7430B Found W/Lift Settings Outside TS Allowable Tolerance as Listed.Caused by Alteration of Nozzle & Disc Oxide Layers.Lift Setting of out-of-tolerance Valves Will Be Adjusted + (20:12:00, 26 June 2025)
- 05000368/LER-1986-006, :on 860421,inadvertent Actuation of Reactor Protective Sys Occurred.Caused by Channel a Sys Departure from Nucleate Boiling Ratio & High Local Power Density Trip Functions Bypassed During Shutdown Operations + (20:16:03, 26 June 2025)
- 05000293/LER-1988-006, :on 880203,trip Signal Generated Unexpectedly from ATWS Div 2 Circuitry Resulting in Automatic Trip of Recirculation Sys Pumps & Subsequent Reactor Protection Sys Scram Signal.Cause Not Conclusively Determined + (20:17:49, 26 June 2025)
- 05000368/LER-1984-015, :on 840302,discrepancy in Fire Barrier Penetration 2099-0002,which Previously Evaluated Acceptable, Identified as Nonfunctional.Caused by Lack of Definitive Guidelines in Walkdown Program + (20:18:18, 26 June 2025)
- 05000346/LER-1989-007, :on 890614,one of Four Strong Motion Triaxial Accelerometers Inoperable for More than 30 Days.Cause to Be Evaluated.Remaining Seismic Monitoring Sys re-energized & Functional W/Addl Accelerometers + (20:25:01, 26 June 2025)
- 05000271/LER-1998-001, :on 980124,discovered That Penetration Seal Did Not Conform to Tested Configuration for 3-h Rated Seal. Caused by Lack of Formal Fire Protection Program at Time of Seal Installation.Repaired non-conforming Seal + (20:33:47, 26 June 2025)
- TAC:44876 + (20:37:14, 26 June 2025)
- TAC:M42535 + (20:38:18, 26 June 2025)
- 05000344/LER-1988-036, :on 881010,containment Ventilation Isolation Signal Found Locked in When Containment Monitoring Sys Returned to Svc.Caused by Personnel Error.Damaged Relay Replaced & Sensor Returned to Operability + (20:39:22, 26 June 2025)
- 05000346/LER-1997-015-01, Forwards LER 97-015-01,which Is Being Submitted Ro Provide Addl Info Re Corrective Actions Being Taken as Result of Subj Occurrence.Changes Marked W/Rev Bar in Margin + (20:41:01, 26 June 2025)
- 05000346/LER-1997-008, :on 970318,inadequate Testing of safety-related Logic Occurred.Overall Root Cause Will Be Completed by 980930 & Results of Evaluation Will Be Reported in Suppl to LER + (20:41:06, 26 June 2025)
- 05000382/LER-1988-006, :on 880405,fire Impairment Not Issued Immediately for Removal of Lock,Per Tech Spec 3.7.11.Caused by Inadequate Administrative Control.Note Added to Work Authorization Instructions,Procedures Revised + (20:41:48, 26 June 2025)
- 05000327/LER-1997-013-01, Forwards LER 97-013-01 Re Missed Surveillance as Result of Inadequate Procedure.Revs Annotated by Vertical Bar to Right of Text + (20:43:18, 26 June 2025)
- 05000254/LER-1997-015, Informs NRC of Change of Committed Due Date Contained in LER 97-015,dtd 970812.Station Changing Due Date of Commitment to 990528 + (20:44:53, 26 June 2025)
- 05000259/LER-1988-007-01, :on 880127,calibr Error Discovered in Four RHR Svc Water (RHRSW) Pump Flow Instruments.Caused by Error on Flow Transmitter Data Sheet.Pump 2D Rebuilt & Impeller Replaced.Rhrsw Pumps Met Tech Spec Flow Rate + (20:47:05, 26 June 2025)
- 05000336/LER-1998-007-01, :on 980408,noted That non-conservative Assumptions May Result in Violation of Fuel Centerline Temp Fuel Design Limit.Caused Indeterminate.Will Complete Siemens Analysis Prior to Entering Mode 4 from Current Outage + (20:51:23, 26 June 2025)
- 05000373/LER-1997-046, :on 971216,potential Pressurization of TBV Exhaust Tunnel Resulted from Ms Helb.Caused by Calculation Error.Revised Final SAR to Include VT Exhaust Ventilation Dampers + (20:52:12, 26 June 2025)
- 05000445/LER-1997-004, :on 980408,issues Discovered During Review of GL 96-01 Associated W/Ts Surveillances.Caused by Inadequate Test Procedures.Revised Applicable Test Procedures to Include Testing When Alternate Power Is in Service + (20:53:30, 26 June 2025)
- 05000416/LER-1988-014, :on 880911,RWCU Sys Isolation Occurred as Operators Shifted from post-pump to Prepump Mode.Caused by Air Trapped in Flow Transmitter.Integrated Operating Procedures Revised + (20:54:44, 26 June 2025)
- 05000458/LER-1988-024, :on 881027,ESF Actuation Occurred Resulting in Isolation of RWCU Sys.Caused by Cross Tripping Phenomenon of Temp Switches & Procedural Error.Changes Made to Surveillance Test Procedures + (20:56:39, 26 June 2025)
- 05000458/LER-1986-051, :on 860810,RWCU Occurred When Daily Surveillance on Leak Detection Temp Modules Conducted.Caused by Personnel Negligence.Permanent Caution Plaque Mounted Near Read-Set Switches + (20:56:40, 26 June 2025)
- 05000366/LER-1988-007, :on 880212,valves Did Not Pass Local Leak Rate Testing & Air Supply Lines Did Not Meet All Sys Design Requirements in Fsar.Caused by Design Deficiency.Valve Deficiencies Corrected & Valve Design Changed + (20:59:05, 26 June 2025)
- 05000278/LER-1988-003, :on 880520 & 22,primary Containment Isolation Sys Group III Inboard Isolation & Half Reactor Scram Occurred on Startup Feed,Resulting in Breaker Trip.Caused by Voltage Fluctuations.Breakers Reclosed + (21:05:40, 26 June 2025)
- 05000302/LER-1986-018, Advises That No Addl Info Under LER 86-018 Will Be Submitted + (21:07:22, 26 June 2025)
- 05000373/LER-1997-020, :on 970422,recirculation Flow Converter Calibration & Functional Testing Defciencies Were Determined.Caused by Inadequate Reviews of Test Procedures. Engineering Evaluated Procedure Deficiencies + (21:10:12, 26 June 2025)
- 05000423/LER-1989-018, :on 890802,condensate Demineralizer Waste Neutralization Sump Effluent Radiation Monitor Declared Inoperable Due to Inadequate Testing.Caused by Personnel Error.Interlocks Included in Procedures + (21:10:15, 26 June 2025)
- 05000267/LER-1988-012, :on 880816,NRC Notified That Ga Co Environ Qualification Temp Profiles in CONTEMPT-G Calculated Lower Peak Temps for Line Break Scenarios.New Temp Profiles Developed by Numerical Applications,Inc + (21:10:25, 26 June 2025)
- 05000352/LER-1988-019, :on 880506,17 Agastat Relays Found W/Missing or Unsecured Locking Springs.Caused by Inadvertent Dislodging During Work Activities in Relay Cabinets.Memo & Surveillance Test Written for Future Ref + (21:12:01, 26 June 2025)
- 05000267/LER-1985-003, :on 850304,during Loss of Offsite Power & Turbine Trip Surveillance,Both Diesel Generator Tie Breakers Failed to Close.Caused by Faulty Cell on Station Battery 1A. Batteries Replaced w/lead-antimony Batteries + (21:22:51, 26 June 2025)
- 05000416/LER-1989-002, :on 890331,leakage Rates of Five Containment Isolation Valves Could Not Be Quantified,Violating Tech Specs.Caused by Excessive Leakage Beyond Equipment Capability.Valve Actuator Replaced + (21:27:25, 26 June 2025)
- 05000029/LER-1988-002, :on 890322,automatic Reactor Scram Occurred When Power to Amplifiers in Nuclear Instrument Cabinet a Lost.Caused by Failure of Capacitor in Sola Transformer. Capacitors Replaced in Accordance W/Qa Program + (21:34:38, 26 June 2025)
- 05000344/LER-1988-027, :on 880915,Train B Suction Valve for Centrifugal Charging Pumps from Vol Control Tank Open & Incapable of Automatic Closure Due to Performance of Design Change.Caused by Personnel Error + (21:34:57, 26 June 2025)
- 05000458/LER-1989-010, :on 890318,unsealed Penetration Discovered in Control Bldg Fire Wall on 116 Ft Elevation Making Barrier Inoperable.Existing Hourly Fire Watch Patrols for Conditions Added to Limiting Condition for Operation + (21:35:44, 26 June 2025)
- TAC:53961 + (21:36:09, 26 June 2025)