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List of results

• 05000259/LER-1981-069-03, During Performance of SI 4.8.B.4-4,gaseous Channel of Continuous Air Monitor O-RM-90-252 Read Downscale.Caused by Instrument Drift. Courting Ratemeter Calibr & Channel Returned to Svc  + (14:35:18, 26 May 2025)
• 05000280/LER-1981-081, /03L-0:on 820121,during Research for LER 81-081/03L-0,found That Original Vacuum Pumps Were Replaced W/Pumps That Failed to Meet Required Seismic Qualifications. Study of Present Pumps Completed.Assistance Request Issued  + (14:35:21, 26 May 2025)
• 05000259/LER-1981-069, Forwards Updated LER 81-069/03X-1  + (14:35:28, 26 May 2025)
• 05000280/LER-1982-002-03, /03L-0:on 820120,both Containment Pumps Declared Inoperable by Failing to Develop Flow.Caused by Water Accumulation in Common Discharge Piping.Piping Drained & Pumps Returned to Svc  + (14:35:40, 26 May 2025)
• 05000334/LER-1982-004-03, /03L-0:on 820127,backup RHR Pump Lost out-of-svc When Normal Ac Power Source Lost Due to Fault in Section of 4 Kv Bus Cable.Cause for Cable Fault Unknown.Cable Returned to Vendor for Analysis  + (14:35:51, 26 May 2025)
• 05000339/LER-1983-036-03, /03L-0:on 830429,while in Mode 6,loss of Vital Bus 2-1 Resulted in Loss of RHR Flow for Less than 1 Minute When One of Two RHR Suction Valves in Series Closed.Caused by Personnel Shorting Test Lead.Bus Restored  + (14:35:52, 26 May 2025)
• 05000280/LER-1982-018-03, /03L-0:on 820121,PT-27 Revealed Amp Readings for Heat Tracing Panels 8 & 9,circuit 13A,below Acceptable Criteria.Caused by Excessive Heat.Defective Heat Tracing Replaced & Tested  + (14:35:55, 26 May 2025)
• 05000328/LER-1983-062-03, /03L-0:on 830421,three of Four Level Switches in Upper Head Injection Sys Discovered Out of Tolerance.On 830505,all Four Switches Found Out of Tolerance.Caused by Instrument Drift.Switches Recalibr  + (14:35:56, 26 May 2025)
• 05000412/LER-1994-008, :on 940615,PORV Was Removed from Service for Minor Seat Leakage Using Plant Procedures.Caused by Deficiency in Procedure 2OM-6.4.Q.Event Will Be Reviewed W/Operators & Deficiencies Will Be Corrected  + (14:36:02, 26 May 2025)
• 05000260/LER-1983-021-03, /03L-0:on 830423,calculated R Factor Less than Flow Bias Tech Spec Setpoint.Caused by Pulling Group of Eight Rods Four Notches to Fully Withdrawn Position.Tech Spec Revs Submitted  + (14:36:05, 26 May 2025)
• 05000259/LER-1982-011-03, /03L-0:on 820124,continuous Air Monitor O-RM-90-252 Found Out of Calibr.Caused by Component Failure. NMC Count Rate Card Number CRA14-A & Triplett Number 420-G Iodine Meter on Continuous Air Monitor Replaced  + (14:36:08, 26 May 2025)
• 05000348/LER-1983-017-03, /03L-0:on 830417,specific Gravity of Train a Svc Water Battery Bank Cells 34 & 43 Less than 1.190.Cause Undetermined.Cells Replaced & Battery Bank Returned to Svc  + (14:36:10, 26 May 2025)
• 05000395/LER-1983-035-03, /03L-0:on 830420,horizontal Fire Barrier Above Svc Water Booster Pump a Found Damaged.Caused by Maint Activities in Immediate Area of Fire Barrier.Damaged Barrier Replaced  + (14:36:13, 26 May 2025)
• 05000328/LER-1983-060-03, /03L-0:on 830419,automatic Control Valve 2-LCV-3-156 in Auxiliary Feedwater Sys Failed to Open on Demand.Caused by Incorrect Size of Metering Orifice.Correct Parts Installed  + (14:36:16, 26 May 2025)
• 05000499/LER-1994-005-02, :on 940607,standby Diesel Generator 22 Had Received Unexpected Test Mode Start Signal.Caused by Voltage Spike Generated by Emergency Fuel Oil Solenoid Deenergizing. Replaced Parts Found to Be Weak  + (14:36:20, 26 May 2025)
• 05000328/LER-1982-011-03, /03L-0:on 820122,performance of SI-16 Revealed Boron Injection Tank Records Not Kept.Caused by Inadequate Procedures.Revisions to SI-16 Recordkeeping Procedures Include Boron Injection Tank Heat Tracing  + (14:36:23, 26 May 2025)
• 05000244/LER-1982-003, RO 82-007/01T:on 820125,unit Experienced Event Described in LER 82-003 Leading to RCS Cooldown Rate Greater than 100 F/H.Further Info Will Be Submitted w/14-day Written Rept  + (14:36:25, 26 May 2025)
• 05000296/LER-1982-003-03, /03L-0:on 820123,during Refueling Outage,While Performing SI 4.2.A-39,temp Switches TS-69-30A,B,C & E on Reactor Cleanup Sys Floor Drain High Temp,Operated at Less than 160 F.Caused by Improper Calibr or Instrument Drift  + (14:36:29, 26 May 2025)
• 05000296/LER-1982-002-03, /03L-0:on 820121,during Surveillance Test SI 4.11.C.1 & 5 Smoke Detector in Auxiliary Instrument Room 3 Would Not Alarm.Caused by Loose Annunciator Point Card Due to Incorrect Installation of Retainer Bar  + (14:36:31, 26 May 2025)
• 05000369/LER-1982-007-03, /03L-0:on 820111,many Instrument Lines Froze W/ Instruments Declared Inoperable Leading to Inadvertent Actuation of ESF Causing Safety Injection,Steamline Isolation & Reactor Trips.Caused by Cold Weather  + (14:36:34, 26 May 2025)
• 05000335/LER-1983-026-09, /09T-0:on 830513,67 of 264 Bergen Paterson EA-3 Clamps Discovered Oriented Improperly.Caused by Vendor Catalog Interpreted Improperly.Clamps Will Be Replaced During Present Outage  + (14:36:36, 26 May 2025)
• 05000369/LER-1982-010-03, /03L-0:on 820120,while in Mode 1,all Digital Rod Position Indications for Control Rod K-8 Lost.Caused by Cabling to Detectors Susceptible to Conductor Damage Due to Own Weight.Bulkhead Connector Cable Replaced  + (14:36:38, 26 May 2025)
• 05000369/LER-1982-008-03, /03L-0:on 820115,exam of Programs on Operator Computer Revealed Equipment Run Time on Fuel Pool Ventilation Sys Exceeded Tech Specs W/O Sample Being Taken from Charcoal Absorber.Caused by Lack of Procedure  + (14:36:44, 26 May 2025)
• 05000338/LER-1983-023-03, /03L-0:on 830423,low Head Safety Injection Pump 1-SI-P-1B Suction Isolation Valve Failed to Open.Caused by Lack of Lubrication on Valve Stem to Operator Nut Area.Stem Lubricated & Stroked  + (14:36:47, 26 May 2025)
• 05000364/LER-1982-007-03, /03L-0:on 820118,boron Concentration in 2C Accumulator Fell Below Min Required in Tech Specs.Sampling Yielded Results Both Below & Above 1900 Ppm Limit.Cause of Fluctuation Not Determined.Accumulator Will Be Monitored  + (14:36:49, 26 May 2025)

• 05000280/LER-1982-015-03, /03L-0,on 820129,while Performing PT-33,low Control Room Envelope Pressure of .045 Inches of Water Found.Caused by Deterioration of Weather Stripping Around Doors.Weather Stripping Replaced  + (14:36:59, 26 May 2025)

• 05000280/LER-1982-012-03, /03L-0,on 820131,amp Readings for Heat Tracing Circuits 23A & C on Panels 8 & 9 Found Below Acceptance Criteria.Apparently Caused by Inadvertent Damage to Heat Tracing Tape During Cleanup Operations.Tape Replaced  + (14:37:04, 26 May 2025)
• 05000280/LER-1982-009-03, /03L-0,on 820128,inadequate Svc Water Flow Resulted in Higher 2-CH-P-1C Lubricating Oil Temp.Pump Declared Inoperable.Caused by Foreign Object in Svc Water Temp Control Valve Body.Object Removed  + (14:37:08, 26 May 2025)
• 05000280/LER-1982-014-03, /03L-0:on 820127,amp Readings for Heat Tracing Panel 8,circuit 2B Found Below Acceptance Criteria.Caused by Excessive Heat Tape.Defective Heat Tracing Replaced. Manner in Which Borated Lines Are Heat Traced Changed  + (14:37:09, 26 May 2025)
• ML20071H297  + (14:37:11, 26 May 2025)
• TAC:46676  + (14:38:26, 26 May 2025)
• AECM-83-0286, Forwards Qualification Status & Compliance Summary Per 10CFR50.49 Re Environ Qualification of Electrical Equipment Important to Safety.Updated Equipment List & Qualification Status for Relevant Components Encl  + (14:39:02, 26 May 2025)
• 05000285/LER-1978-040-03, /03L-1 on 781205:during 1978 Refueling Outage, Containment Leak Rate Exceeded Limits.Penetrations Were Repaired & Leakage Was Reduced to Below Limits  + (14:39:05, 26 May 2025)
• 05000285/LER-1978-041-03, /03L-0 on 781207:air Flow Rate Through Charcoal Filter Units VA-26A,VA-26B & VA-66 Found to Be Less than Tech Specs.Cause Undetermined;Investigation Is Currently Proceeding  + (14:39:11, 26 May 2025)
• 05000285/LER-1978-041, Forwards LER 78-041/03L-0  + (14:39:14, 26 May 2025)
• 05000285/LER-1978-031, Forwards LER 78-031/03X-1  + (14:39:28, 26 May 2025)
• 05000333/LER-1978-085, Forwards LER 78-085/04X-1  + (14:39:37, 26 May 2025)
• 05000366/LER-1979-048-03, At 86% Power,Average Drywell Temp Discovered at 135.3 F.High Temp Caused by Control Rod Drive Access to Underside of Vessel Through Biological Shield Left Off During Drywell Closeout  + (14:40:56, 26 May 2025)
• 05000366/LER-1979-048, Forwards Updated LER 79-048/03X-1  + (14:41:05, 26 May 2025)
• TAC:47613  + (14:43:23, 26 May 2025)
• B10717, Advises of Minor Oversight in Documentation of Containment Water Level Monitoring Sys in Response to NUREG-0737,Item II.F.1.5.Design Verification Reveals wide-range Containment Water Level Monitor Measures Vol of 565,000 Gallons  + (14:43:24, 26 May 2025)
• EPID:L-2019-LLA-0058  + (14:44:08, 26 May 2025)
• ML20071E019  + (14:44:16, 26 May 2025)
• 05000259/LER-1983-007-03, /03L-0:on 830205,MSRV 1-1-22 Failed to Close & Drywell Unidentified Leakage Exceeded 5 Gpm.Caused by Damaged Vacuum Relief Valve Failing to Reseat.Valve Replaced.Mod Planned During Next Refueling Outage  + (14:44:28, 26 May 2025)
• 05000321/LER-1981-094-03, While Testing Standby Gas Treatment Filter Train A,Train Would Not Remove Greater than or Equal to 99% of Halogenated Hydrocarbon Gas,Per Tech Specs.Caused by Defective Charcoal  + (14:44:42, 26 May 2025)
• 05000321/LER-1981-094, Forwards Updated LER 81-094/03X-1  + (14:44:47, 26 May 2025)
• 05000272/LER-1982-081, Supplemental LER 82-081/01X-1:on 821104,16 1,000-kip Steam Generator Snubbers Found Out of Spec on Bleed Test & Six Snubbers Failed Acceleration Test.Caused by Flattened Piston Seal Rubber Matl Due to Aging.Seals Rebuilt  + (14:44:49, 26 May 2025)
• TAC:49793  + (14:44:51, 26 May 2025)
• ML20071D551  + (14:45:31, 26 May 2025)
• 05000260/LER-1983-004-01, /01T-0:on 830220,reactor Water Level Switch Setpoints Discovered out-of-tolerance.Caused by Setpoint Drift in Barton 288 Switches.Switches Recalibr & Will Be Replaced Per DCR 1398  + (14:45:32, 26 May 2025)
• ML20071D375  + (14:45:59, 26 May 2025)