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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

• 05000254/LER-1990-031, :on 901120,while Performing HPCI Turbine Area Temp Isolation Calibr,Setpoints of All Four Temp Switches Higher than Tech Spec Limits.Cause Not Determined.Switches Will Be Replaced & Calibr  + (16:45:21, 26 May 2025)
• 05000281/LER-1990-005-03, :on 901120,rod Control Cluster Assembly M-12 Declared Inoperable Due to Mismatch Between Group & Rod Position Indication.Caused by Control Rod Positioned Two Steps from Bottom of Core  + (16:45:23, 26 May 2025)
• 05000483/LER-1990-016, :on 901124,reactor Trip Occurred on Low Steam Generator Level Which Resulted from Turbine Trip on Spurious Moisture Separator Reheater High Level Signal.Caused by Vibration.Level Switch Inverted  + (16:45:24, 26 May 2025)
• ML20065T039  + (16:45:28, 26 May 2025)
• ML20065T032  + (16:45:30, 26 May 2025)
• PM-80-109, Forwards Monthly Operating Rept for Oct 1980  + (16:45:32, 26 May 2025)
• 05000311/LER-1982-110-03, /03L-0:on 820926,no Indication of Seal Interspace Air Pressure Found on Containment Air Lock.Air Lock Also Failed Seal Leakage Test.Caused by Loose Pivot on Air Interlock Linkage.Leakage Caused by Failure of Seal Joint  + (16:45:34, 26 May 2025)
• 05000318/LER-1981-017-03, /03L-0:on 810414,drain Line Accidentally Broken from Emergency Discharge of ECCS Pump Room Cooler 22.Caused by Dropped Tool Breaking Plastic Nipple.Scaffolding Checked to Ensure Required Toe Boards  + (16:45:36, 26 May 2025)
• 05000282/LER-1990-017-01, :on 901121,discovered That Bus Duct Cooling Fan 11 Not Running & Supply Breaker Tripped,Resulting in Main Generator,Turbine & Reactor Trip.Caused by Inadequate Design.Supply Breaker Replaced  + (16:45:38, 26 May 2025)
• 05000311/LER-1982-107-03, /03L-0:on 820923,axial Flux Distribution Went Out of Target Band Due to Turbine Load Reduction When Turbine Generator Stator Water Temp Increased.Temp Increase Caused by Clogged Ports on Valve Positioner 2ST1  + (16:45:40, 26 May 2025)
• 05000416/LER-1990-025, :on 901122,actuation of Reactor Protection Sys Occurred During Surveillance of Reactor Mode Switch.Caused by Diminishing Power Supply of Test Equipment.Evaluation Will Be Conducted  + (16:45:42, 26 May 2025)
• 05000311/LER-1982-116-03, /03L-0:on 820927 & 28,RCS Subcooling Margin Monitor Failed.Caused by Malfunction of Computer Logic Board in Process Computer & Previous Repair of Computer, Respectively.Logic Board Replaced & Point Reset  + (16:45:45, 26 May 2025)
• 05000440/LER-1990-034, :on 901125,discovered That Reactor Pressure Vessel Water Level Instrumentation Equalizing Valve Mispositioned.Caused by Personnel Error.Equalizing Valve Closed & Walkdown Performed  + (16:45:57, 26 May 2025)
• 05000318/LER-1981-020-03, /03L-0:on 810407,containment Atmosphere Particulate Radioactivity Detector Failed.Caused by Cable to Junction Box Connector Failure Due to Conductor Stress Formed During Repair Resulting in Split Connector Block  + (16:46:02, 26 May 2025)
• 05000353/LER-1990-020-02, :on 901119,primary Containment post-LOCA Radiation Monitoring Sys Declared Inoperable Due to Deficient Circuit Board in Three of Four Channels.Caused by Inadequate Design Review.Replacement Installed  + (16:46:03, 26 May 2025)
• 05000352/LER-1990-026-01, :on 901118,full Reactor Scram Signal Generated on High Reactor Pressure Vessel Pressure of 1,033 Psig. Caused by Personnel Error.Operator Counseled & Event Will Be Included in Operator Training  + (16:46:05, 26 May 2025)
• 05000272/LER-1982-075-03, /03L-0:on 820927 Pressurizer Level Channel III Read High.Channel Bistable Placed in Tripped Condition Constituting Operation in Degraded Mode.Cause Under Investigation.Supplemental Rept Will Be Submitted  + (16:46:07, 26 May 2025)
• 05000373/LER-1982-121-01, /01T-0:on 821012,found HVAC Duct Hangers S-2065 & S-2049 Not Installed Per Design Drawing.Caused by Inadvertent Substitution of Tube Steel.Design Drawing Will Be Revised  + (16:46:10, 26 May 2025)
• 05000272/LER-1982-072-03, /03L-0:on 820925,exhaust Fan 11 Drive Belts in Fuel Handling Area Discovered Broken & Fan 12 Belts Loose & Operating at Less than Normal Speed.Caused by High Ambient Temp in Vicinity of Fans.Belts Replaced  + (16:46:12, 26 May 2025)
• 05000318/LER-1981-021-03, /03L-0:on 810412,transient Occurred Causing Pressurizer Pressure to Drop Below 2225 Psig.Caused by Excessive Injection of Boric Acid by Operator to Level Power Increase.Personnel Counseled  + (16:46:15, 26 May 2025)
• ML20065S883  + (16:46:17, 26 May 2025)
• ML20065S876  + (16:46:19, 26 May 2025)
• 05000265/LER-1982-017-03, /03L-0:on 821001,small Leak Discovered in HPCI Sys Supply Steam Line Break Flange.Caused by Failed Flange Gasket.Gasket Replaced like-for-like During & Prior to Outage.Leakage Stopped W/Flange Bolt Adjustments  + (16:46:21, 26 May 2025)
• 05000331/LER-1982-065-03, /03L-0:on 820929,during Normal Operation,Racking Mechanism Access Door for Breaker 1B-4401 Found Open.Cause Unknown.Access Doors for 1B-3401 & 1B-4401 Will Be Locked & Maint Procedures Changed  + (16:46:25, 26 May 2025)
• 05000395/LER-1990-010, :on 901117,insp Revealed That Output Voltage Low & Slowly Degrading,Causing Trip of Breaker Supplying Protection Set I.Caused by Failure of Ferroresonant Transformer.Transformer Repaired  + (16:46:32, 26 May 2025)

• 05000457/LER-1990-012-07, :on 901120,containment Fuel Handling Incident Radiation Monitor 2RT-AR011 Went Into High Alarm & Interlock Actuation,Initiating Isolation Signal.Caused by Component Failure.Detector Replaced  + (16:46:35, 26 May 2025)

• ML20065S813  + (16:46:37, 26 May 2025)
• 05000317/LER-1982-057-03, /03L-0:on 820927,channel a Th Read 11 Degrees Low. Caused by Increased Resistance in Temp Detector 1-TE-112HA Possibly Due to Loose Connection in Containment.Input Removed from Channel a RPS  + (16:46:39, 26 May 2025)
• 05000373/LER-1990-007, :on 900618,during Operating Surveillance,Rcic Turbine Tripped on Mechanical Overspeed.Caused by Contaminated Oil in Lube Oil Sys.Oil Sys Flushed,Oil Changed & Limit Switch Readjusted  + (16:46:41, 26 May 2025)
• 05000237/LER-1982-041-03, /03L-0:on 820927,during Shutdown,Vacuum Breaker 2-1601-33F Found to Be Binding Suppression Chamber to Drywell Vacuum Breaker.Apparently Caused by Swollen Chevron Packing Seal.Packing Seal Replaced  + (16:46:47, 26 May 2025)
• 05000302/LER-1990-005, :on 900329,util Found Operating Outside Design Basis.Caused by Oversight of A/E Performing Original RB Flood Level Calculation.Rb Instrumentation & Equipment Relocated to Higher Elevation  + (16:46:51, 26 May 2025)
• 05000348/LER-1990-008, :on 901112,emergency Diesel Generator 2C Tripped.Caused by Defective Spring in Handswitch for Generator Output Breaker.Handswitch Replaced  + (16:47:00, 26 May 2025)
• ML20065S720  + (16:47:06, 26 May 2025)
• 05000313/LER-1990-001-01, :on 900228,loss of Reactor Bldg Integrity Occurred Due to Combined Effect of Svc Water Cooling Coil Leak on Reactor Bldg Cooler.Caused by Localized Corrosion Pitting Mechanism.Blind Flanges Installed  + (16:47:14, 26 May 2025)
• TXX-9412, Monthly Operating Repts for Apr 1994 for Comanche Peak Steam Electric Station Units 1 & 2  + (16:47:33, 26 May 2025)
• ML20065S313  + (16:47:43, 26 May 2025)
• TAC:M83447  + (16:47:44, 26 May 2025)
• 05000298/LER-1982-005, Amended LER 82-005/03X-1:on 820221,surveillance Test Indicated MSIV 86A Had Closing Time Faster than Allowed by Tech Specs.Caused by Loss of Nitrogen Preload & Fluid from Hydraulic Sys Accumulator.Accumulator Recharged & Tested  + (16:47:47, 26 May 2025)
• 05000293/LER-1982-003, Forwards Updated LER 82-003/99X-2  + (16:47:55, 26 May 2025)
• 05000317/LER-1989-023, :on 891220,design Deficiency Noted Which Could Result in Unavailability of Both safety-related Svc Water Subsystems.Caused by Design Deficiency.Leak Rate Monitoring Increased  + (16:48:01, 26 May 2025)
• TAC:7729  + (16:48:26, 26 May 2025)
• TAC:48403  + (16:48:36, 26 May 2025)
• 05000366/LER-1979-098-01, Plant Engineering Personnel Reviewed Wiring Diagrams & Confirmed Problem W/Hpci Cable Separation.Caused by Design Error.Hpci Cable Rerouted Per Design Change Request 79-380 on 810822  + (16:48:45, 26 May 2025)
• 05000366/LER-1979-098, Forwards Updated LER 79-098/01X-1  + (16:48:52, 26 May 2025)
• 05000325/LER-1982-024, Supplemental LER 82-024/03L-2:on 820214,during Periodic Test,Discovered That Open Position Indication for Drywell to Suppression Vacuum Breaker X18H Could Not Be Achieved.Caused by Failure of Vacuum Breaker to Fully Stroke Open  + (16:48:57, 26 May 2025)
• 05000321/LER-1980-016-03, Investigation of IE Bulletin 79-27 Revealed That Breaker Control Power to Swing Diesel B Motor Control Ctr Fed by non-Class IE Vital Ac Sys. Caused by Design Error  + (16:49:13, 26 May 2025)
• 05000321/LER-1980-016, Forwards Updated LER 80-016/03X-1  + (16:49:22, 26 May 2025)
• 05000498/LER-1994-003, :on 940118,discovered Interference Between Plant Exhaust Vent Tornado Damper Linkage & Gusset.Caused by Undetected Const Interference.Interference Between Damper & Gusset Removed by Notching Gusset  + (16:49:55, 26 May 2025)
• 05000272/LER-1982-016-04, During Gaseous Release from Waste Gas Sys,Containment/Plant Vent Monitors 1R11A, 1R12A & 1R12B Incorrectly Aligned.Caused by Operator Failure to Properly Perform Operating Instruction  + (16:50:15, 26 May 2025)
• PY-CEI-NRR-1281, Part 21 Rept Re Failure of Several Asco Scram Solenoid Pilot Valves.Initially Reported on 901211.Faulty Valves Limited to Single Production Run.Installed Valves from Subj Production Run Replaced  + (16:50:49, 26 May 2025)
• ML20065Q699  + (16:51:33, 26 May 2025)