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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

• 05000325/LER-1983-014-03, /03L-0:on 830406 & 08,during Ongoing Refueling, Listed Control Rods Had No Indications for Identified Positions.Caused by Defective Prototypic Inlet Piping (PIP) Connectors,Reed Switch & PIP Probe  + (12:24:32, 26 May 2025)
• 05000277/LER-1983-015-03, /03L-0:on 830611,while Performing Surveillance Test,Reactor Water Cleanup Inboard Isolation Valve MO-2-12-15 Failed to Close.Caused by Open Auxiliary Contact in Motor Control Ctr,Preventing Close Signal.Contact Freed  + (12:24:34, 26 May 2025)
• 05000315/LER-1983-059-03, /03L-0:on 830624,during Normal Operation,Control Room Access Fire Door 412 Failed to Operate Properly.Caused by Failure of Closure Support Arm.Closure Arm Repositioned & Closing Spring Tightened  + (12:24:44, 26 May 2025)
• 05000271/LER-1994-012, :on 941010,exceeded Core Thermal License Limit by 0.75 Mwth Due to Isolation of Feedwater Pressure Transmitter That Supplies Signal to Computer Program That Calculates Core Thermal Power  + (12:24:46, 26 May 2025)
• 05000244/LER-1983-020-03, /03L-0:on 830613,during Startup from Refueling Outage,Rcs Chloride Concentration Exceeded 15 Ppm at Greater than 250 F.Caused by Increased Chloride Solubility Due to Increasing RCS Temp & Contamination  + (12:24:48, 26 May 2025)
• 05000328/LER-1994-008-02, :on 941021,manual Actuation of Reactor Trip Breakers Occurred Due to Failure of Rod Control Demand Step Counter.Caused by Incorrect Step Position Indication on Control Bank a Group 2 Step Counter  + (12:24:51, 26 May 2025)
• ML20077A586  + (12:24:53, 26 May 2025)
• ML20077A581  + (12:24:55, 26 May 2025)
• 05000272/LER-1983-029-03, /03L-0:on 830617,control Room Operator Discovered Three RPI Channels Indicating Greater than Max Allowed Deviation in Tech Specs.Caused by Calibr Drift in Two Channels.Channels Recalibr  + (12:25:06, 26 May 2025)
• 05000348/LER-1983-035-03, /03L-0:on 830610,vacuum Pump Tripped & Containment Atmosphere Activity Particulate Monitor R-11 & Gaseous Monitor R-12 Declared Inoperable.Caused by Failure of Inboard Pump During Maint on Outboard Pump  + (12:25:09, 26 May 2025)
• 05000280/LER-1983-027-03, /03L-0:on 830615,intermediate Range High Flux Trip Setpoint Found Nonconservative During Review of Cycle 7 & Cycle 8 Data.Caused by Improper Assessment of Effect of New Core Design on Instrumentation  + (12:25:17, 26 May 2025)
• 05000220/LER-1983-014-03, /03L-0:on 830615,16,17,20 & 21,115-kV Offsite Power Line Removed from Svc for 10 H Each Day.Caused by Need to Allow Const of 115 Kv Line for Unit 2,currently Under Const.Line Returned to Svc Each Day  + (12:25:19, 26 May 2025)
• 05000348/LER-1983-034-03, /03L-0:on 830616,pressurizer Pressure Dropped Below Tech Spec Limits During Startup.Caused by Personnel Error.Rcs Boration,Combined W/Load Increase,Resulted in Pressurizer Pressure Drop.Personnel Counseled  + (12:25:24, 26 May 2025)
• 05000387/LER-1983-094-03, /03L-0:on 830617,during Cold Startup,Average Power Range Monitor Flow Biased Scram Trip Setpoint Less Conservative than Tech Specs.Caused by Low Concentration of Xenon in Core.Setpoint Adjusted  + (12:25:26, 26 May 2025)
• 05000353/LER-1991-006-02, :on 910404,emergency Diesel Generator Inadvertently Started.Caused by Personnel Error.Operator Who Depressed Wrong Button Counseled & Procedural Enhancements Implemented  + (12:25:49, 26 May 2025)
• 05000266/LER-1991-001, :on 910405,loss of off-site Power to Both Units Resulted in Loss of Normal Feedwater.Cause Unknown. Operators Resolved Conditions Which Resulted in Design Inadequacy  + (12:25:51, 26 May 2025)
• 05000361/LER-1994-005, :on 941012,voluntary TS 3.0.3 Entry Due to Declaring Both Trains of ECCS Inoperable in Mode 1.Util Replaced 2PCV6418 W/Qualified in-kind Replacement Valve  + (12:25:58, 26 May 2025)
• 05000416/LER-1983-074-03, /03L-0:on 830606,Div 1 Bus Breaker,Ite Type 5HK350,tripped During LPCS Pump Startup for Monthly Surveillance.Cause Not Determined During Maint Investigation  + (12:25:59, 26 May 2025)
• 05000414/LER-1994-007-01, :on 941018,reactor Trip Occurred & TS Violated. Caused by Document Use Practices & Less than Adequate Mgt Directions.Cr Operators Entered Appropriate Emergency Procedures & Stabilized Plant  + (12:26:01, 26 May 2025)
• 05000321/LER-1994-012, :on 941025,partial Group 1 PCIS Trip Initiated Because Bias Spring Assembly Incorrectly Installed in Main Turbine EHC Sys.Bias Spring Installed Correctly & Contract Personnel Made Aware of Consequences of Event  + (12:26:03, 26 May 2025)
• 05000395/LER-1983-060-03, /03L-0:on 830609,boron Injection Tank Boron Concentration Fell Below Tech Specs.Caused by Overpressurized Sys,Resulting in Relief Valve Actuation. Procedures Revised  + (12:26:05, 26 May 2025)
• 05000325/LER-1994-012, :on 940922,HPCI Declared Inoperable Due to Failure of Lube Oil CW Supply Valve Control Power Fuse. Workers Disciplined Re Importance of Maintaining Questioning Attitude & When Uncertain Not to Proceed  + (12:26:46, 26 May 2025)
• 05000302/LER-1983-018, Updated LER 83-018/01T-1:on 830413,preliminary Repts Received from B&W Indicated 51 of 120 Upper Core Barrel Bolts W/Ultrasonic Flaw Indications.Caused by Intergranular Stress Corrosion Cracking.Bolts Replaced  + (12:26:56, 26 May 2025)
• 05000254/LER-1983-025-03, /03L-0:on 830621,maint Dept Observed Valve Yoke Pulled Away from Valve Bonnet & Valve Steam Bent.Caused by Bolts Vibrating Loose.Bent Stem Straightened & Locking Tabs Installed on yoke-to-bonnet Bolting  + (12:27:02, 26 May 2025)
• L-94-010, Evaluation of Util Response to Suppl 1 to NRC Bulletin 90-01: Byron-1/-2, Technical Evaluation Rept  + (12:27:21, 26 May 2025)

• 05000282/LER-1989-010, :on 890721,reactor Trip Occurred Resulting from Loss of One Reactor Coolant Pump.Caused by Personnel Error. Problem Investigated.Bus Doors 4160V Labeled & Potential Fuse Drawer Fronts Also Labeled  + (12:27:44, 26 May 2025)

• 05000341/LER-1990-013, :on 901228,determined That Need for Isolation of Sampling Line in Event of LOCA Not Identified in Procedure & Primary Containment Integrity Could Be Compromised.New Sample Taps Added  + (12:27:47, 26 May 2025)
• TAC:52416  + (12:27:57, 26 May 2025)
• ML20076N029  + (12:28:39, 26 May 2025)
• TAC:49989  + (12:29:53, 26 May 2025)
• TAC:45264  + (12:30:00, 26 May 2025)
• 05000333/LER-1993-009-02, Forwards LER 93-009-02 Re Low Rwl Scram Due to FW Transient. Replacement of Reactor Feed Discharge Valves W/Improved Design Scheduled So That One Valve Will Be Replaced During 1994 Refueling Outage  + (12:32:20, 26 May 2025)
• ML20076K993  + (12:32:32, 26 May 2025)
• 05000324/LER-1983-079-03, /03L-0:on 830807,during Diesel Generator 1 Monthly Load Test PT-12.2a,generator Reverse Power Trip Occurred, Rendering Diesel Unavailable for Automatic Operation.Caused by Personnel Error.Personnel Counseled  + (12:32:35, 26 May 2025)
• ML20076K800  + (12:33:06, 26 May 2025)
• ML20076K793  + (12:33:08, 26 May 2025)
• 05000370/LER-1983-037-03, /03L-0:on 830801,invalid Alarms Received for Fire Detection Zones Efa 175 (Reactor Bldg Elevation 768) & 186 (Reactor Bldg Annulus) Which Would Not Clear.Caused by Dust &/Or Welding Fumes Due to Maint Activities  + (12:33:15, 26 May 2025)
• 05000331/LER-1983-029-03, /03L-0:on 830809,during Normal Operations,Both Doors of Reactor Bldg Airlock Found Open Simultaneously. Caused by Blown Interlock Fuse & Loose Wire.Interlock Repaired  + (12:33:18, 26 May 2025)
• 05000282/LER-1994-008-01, :on 940926,inoperability of Continuous Air Monitor When Power Supply Was Tripped W/O CR Knowledge. Power Supply Reset  + (12:33:21, 26 May 2025)
• ML20076K756  + (12:33:26, 26 May 2025)
• ML20076K746  + (12:33:29, 26 May 2025)
• ML20076K735  + (12:33:32, 26 May 2025)
• ML20076K732  + (12:33:34, 26 May 2025)
• 05000316/LER-1983-077-01, /01T-0:on 830824,following Discussion W/Region Iii,Control Room Smoke Detectors Declared Inoperable.Caused by Difference in Interpretation of Testing Requirement. Smoke Detection Sys Test Initiated  + (12:33:36, 26 May 2025)
• ML20076K728  + (12:33:38, 26 May 2025)
• ML20076K721  + (12:33:41, 26 May 2025)
• TAC:52640  + (12:33:42, 26 May 2025)
• 05000328/LER-1994-007-01, :on 940923,CCP Total Flow Rate Exceeded TS Upper Limit Resulting in Pump Being Inoperable.Caused by Incorrect Evaluation of Spare Rotating Element.Previously Performed Evaluation Being Reviewed  + (12:33:44, 26 May 2025)
• 05000416/LER-1994-009-02, :on 940929,LSFT Surveillance Procedures Discrepancy in Testing of Containment Spray Initiation Logic Was Revealed.Caused by Procedural Inadequacy.Deficiency Rept Was Written  + (12:33:47, 26 May 2025)
• 05000416/LER-1994-010-02, :on 940930,during Walkdown of Control & Auxiliary Bldg Pressure Doors,Pressure Door OC312 Was Found Propped Open.Caused by Inadequate Procedural Guidance. Procedure Revised  + (12:33:52, 26 May 2025)
• 05000261/LER-1983-022-01, /01T-0:on 830823,svc Water Leak Discovered on Containment Fan Cooler HVH-2.Svc Water Isolated.Caused by Defective Tube Bundle.Tube Repaired  + (12:33:53, 26 May 2025)