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| Issue date | Title | Topic | |
|---|---|---|---|
| ML20210B815 | 3 February 1986 | LERs 85-048,85-049 & 85-051 Have Been Canceled | |
| 05000366/LER-1984-001, Revised LER 84-001-01:on 840203,plant Personnel Detected Fracture in 66-inch Vent Header in Bay 5.Caused by Brittle Fracture of Vent Header Matl.Vent Header Will Be Repaired Prior to Startup | 21 March 1984 | Revised LER 84-001-01:on 840203,plant Personnel Detected Fracture in 66-inch Vent Header in Bay 5.Caused by Brittle Fracture of Vent Header Matl.Vent Header Will Be Repaired Prior to Startup | |
| 05000366/LER-1983-040, Updated LER 83-040/03X-1:on 830709 & 14,control Rod Drive Low Pressure or High Level Alarm Received for HCV 2C11-26-31 & 02-29.Caused by Leaking EP-111 Nitrogen Charging Valves. Valves Replaced & HCVs Returned to Svc | 12 March 1984 | Updated LER 83-040/03X-1:on 830709 & 14,control Rod Drive Low Pressure or High Level Alarm Received for HCV 2C11-26-31 & 02-29.Caused by Leaking EP-111 Nitrogen Charging Valves. Valves Replaced & HCVs Returned to Svc | Time of Discovery |
| 05000366/LER-1983-055, Updated LER 83-055/03X-1:on 830713 & 21,RCIC Pump 2E51-C002 Would Not Deliver 600 Gpm Required Tech Spec Flow.Caused by Unadjusted Electric Governor Remote Actuator.Actuator Adjusted.W/Amended | 5 December 1983 | Updated LER 83-055/03X-1:on 830713 & 21,RCIC Pump 2E51-C002 Would Not Deliver 600 Gpm Required Tech Spec Flow.Caused by Unadjusted Electric Governor Remote Actuator.Actuator Adjusted.W/Amended | |
| 05000366/LER-1983-126, Amended LER 83-126/03L-0:on 831113,safety Relief Valve Tailpipe Temp Recorder 2B21-B614 Observed Stamping Erratically.Caused by Component Failure.Advancing Mechanism, Solenoid & Arm & Hub Assembly Replaced | 5 December 1983 | Amended LER 83-126/03L-0:on 831113,safety Relief Valve Tailpipe Temp Recorder 2B21-B614 Observed Stamping Erratically.Caused by Component Failure.Advancing Mechanism, Solenoid & Arm & Hub Assembly Replaced | |
| 05000366/LER-1983-127, Amended LER 83-127/03L-0:on 831108,while Pumping Water from Drywell Equipment Drain Sump,Pump Discharge Valve 2G11-F018 Would Not Open.Sys Declared Inoperable.Caused by Blown Fuse in Valve Control Circuit | 5 December 1983 | Amended LER 83-127/03L-0:on 831108,while Pumping Water from Drywell Equipment Drain Sump,Pump Discharge Valve 2G11-F018 Would Not Open.Sys Declared Inoperable.Caused by Blown Fuse in Valve Control Circuit | |
| 05000366/LER-1983-099, Updated LER 83-099/03X-1:on 830925 & 1005,hydrogen Dioxide Analyzer a Declared Inoperable During Procedure HNP-2-3882 & Out of Calibr,Respectively.Caused by Worn Diaphragms in Sample Pump a & Instrument Drift | 28 October 1983 | Updated LER 83-099/03X-1:on 830925 & 1005,hydrogen Dioxide Analyzer a Declared Inoperable During Procedure HNP-2-3882 & Out of Calibr,Respectively.Caused by Worn Diaphragms in Sample Pump a & Instrument Drift | Post Accident Monitoring |
| 05000366/LER-1982-068, Updated LER 82-068/03X-1:on 820707 & 24,volumetric Weighted Average Drywell Air Temp Exceeded Tech Spec Limit of 135 F. Caused by High Ambient Temp & Failure of Alternate Chiller Fans 8B & 9B.New Chilling Units Installed | 26 October 1983 | Updated LER 82-068/03X-1:on 820707 & 24,volumetric Weighted Average Drywell Air Temp Exceeded Tech Spec Limit of 135 F. Caused by High Ambient Temp & Failure of Alternate Chiller Fans 8B & 9B.New Chilling Units Installed | |
| 05000366/LER-1980-096, Updated LER 80-096/03X-2:on 800619 & 27,w/reactor Mode Switch in Run,Reactor Bldg to Torus Vacuum Breaker Isolation Valve Failed to Open.Caused by Failure of D-P Switch to Actuate.Switch Replaced | 23 December 1982 | Updated LER 80-096/03X-2:on 800619 & 27,w/reactor Mode Switch in Run,Reactor Bldg to Torus Vacuum Breaker Isolation Valve Failed to Open.Caused by Failure of D-P Switch to Actuate.Switch Replaced | |
| 05000366/LER-1980-124, Updated LER 80-124/03X-1:on 800813 & 27,during Surveillance of Torus/Drywell Vacuum Breakers,J & I Breakers Failed to Give Proper Light Indication.Caused by Air Control Valves Being Out of Adjustment.Valves Adjusted & Breakers | 16 December 1982 | Updated LER 80-124/03X-1:on 800813 & 27,during Surveillance of Torus/Drywell Vacuum Breakers,J & I Breakers Failed to Give Proper Light Indication.Caused by Air Control Valves Being Out of Adjustment.Valves Adjusted & Breakers Tested | |
| 05000321/LER-1979-082, Updated LER 79-082/03X-2:on 790825-27,attempt to Perform RCIC Pump Operability Procedure Unsuccessful When Turbine Failed to Trip Upon Manual Signal.Caused by Burned Out Turbine Trip Actuator Coils & Binding Assembly | 23 November 1982 | Updated LER 79-082/03X-2:on 790825-27,attempt to Perform RCIC Pump Operability Procedure Unsuccessful When Turbine Failed to Trip Upon Manual Signal.Caused by Burned Out Turbine Trip Actuator Coils & Binding Assembly | |
| 05000321/LER-1981-120, Updated LER 81-120/01T-1:on 811105,AE Advised That in Event of Main Steamline Break or Scram Discharge,Isolation of HPCI & Reactor Core Isolation Cooling Sys Could Occur.Caused by Erroneous Analysis.Event Would Not Occur | 3 August 1982 | Updated LER 81-120/01T-1:on 811105,AE Advised That in Event of Main Steamline Break or Scram Discharge,Isolation of HPCI & Reactor Core Isolation Cooling Sys Could Occur.Caused by Erroneous Analysis.Event Would Not Occur | |
| ML20147H527 | 20 December 1978 | /03L-0 on 781207:during Normal Oper & Performance of Procedure HNP-2-3307,HPCI Steam Line Flow Ft&C Switch 2E41-N004 Was at -217 in Water,Due to Instru Drift | |
| ML20147H567 | 20 December 1978 | /03L-0 on 781210:w/reactor in Run Mode,During Weekly Calibr Check HNP-2-3604,2N62-N009B Was Found Inoper, Due to Bad Hydrogen Sensor | |
| ML20147H513 | 20 December 1978 | /03L-0 on 781208:during Steady State Oper,During Procedure HNP-2-3410,2E51-N017 Would Trip at -116 of Water for Low Setpoint & 111.9 of Water at High Setpoint,Due to Instru Drift | |
| ML20147H478 | 20 December 1978 | /03L-0 on 781210:noted That 2B21-N017C Tripped at 37.7 Inches of Water Decreasing.Caused by Instru Drift | |
| ML20062G317 | 18 December 1978 | /03L-0 on 781130:refueling Floor Vent Exhaust sensor(D11-N012C)gave False High Indication.Caused by Sensor Mounted in Such a Way as to Allow Rain Water to Enter | |
| ML20147H559 | 18 December 1978 | /03L-0 on 781205:w/reactor in Run Mode During Special Inspec of 3-hour Fire Barriers,A Manila Rope Was Found Thru Fire Seal of Cable Tray 2BHA902 in the RPS M.G. Set Room,Due to Constr Personnel Error | Fire Barrier Fire Watch |
| ML20062G299 | 18 December 1978 | /03L-1 on 780710:shock Suppressor RHRH-229 Found to Be Low on Fluid.Caused by Leaking O Ring Seal | |
| ML20147C278 | 11 December 1978 | /03L on 781121:failure to Submit RO 50-366/78-55 W/In 30 Days.Caused by Deviation Rept 2-78-79 Not Received by Responsible Dept Head Nor Superintendent of Plant Engr Svcs.Personnel Were Reminded of Procedures | |
| ML20062F399 | 9 December 1978 | /03L-0 on 781027:severe Arcing at Exciter Collector Ring of B31-S001A Trippingamg Set Causing Ring & Brushes to Burn.Caused by Bolts Used to Fasten Brush Holders to Yoke Assembly Having Insufficient Length | |
| ML20147C298 | 9 December 1978 | /03L-0 on 781203:settings Found at 1090 Psig on Turbine Control Valve Fast Closure Oil Pressure Low Trip Switches 2C71-N005A & 2C71-N005B.Tech Specs Req 1100psig. Caused by Instru Drift | |
| ML20147C253 | 8 December 1978 | /03L-0 on 781204:in Run Mode,Both Secondary Containment Doors on the 130 Ft El Were Opened at the Same Time Due to Personnel Error.Incident Presented No Hazards. Personnel Were Reminded of Proper Procedure | |
| ML20147C147 | 1 December 1978 | /03L-0 on 781117:during Reactor Water Level Test & Calibr HND-2-5281,2B21-NO25A Failed to Meet Acceptance Criteria Due to Mech Failure of Instru.Caused by Binding of Pointer Shaft Inits Bushing on Low End of Scale | |
| ML20147C194 | 1 December 1978 | /03L-0 on 781117:procedure HNP-2-3003 Was Not Completed W/In Specified Interval Per Tech Specs 4.3.1.1(4) for Instru 2B21-N017D.Caused by Personnel Repairing 2 Other Instru & Procedure Had to Be Stopped Due to Repairs | |
| ML20147C262 | 28 November 1978 | /03L-1 on 780724:average Drywell Temp Exceeded Limit of 135F as Set Forth in Tech Specs 3.6.1.7.Caused by Stratification of Air Temp in Drywell | |
| ML20147C207 | 22 November 1978 | /03L-0 on 781109:suppression Chamber Drywell Vacuum Breakers Were Not Demonstrated Operable W/In Tech Spec Time Limit Due to Personnel Error | |
| ML20147C334 | 22 November 1978 | /03L-0 on 781115:procedure HNP-2-5202 Took Over 2 Hours Because 2B21-NO17C Could Not Be Calibr.Instru Was Replaced | |
| ML20062F402 | 20 November 1978 | /03L-0 on 781120:during NRC Audit It Was Found That RHR Time Delay Relay E11-K126 Had Been Left in Uncalibrated State from 780412 to 780627.Redundant Relays E11-K125 a & B Were Functioning.Procedures Will Be Rev | |
| ML20062D647 | 20 November 1978 | /03L-0 on 781109:during Normal Oper Core Drills Were Made Thru Diesel Generator Room Walls to Allow Conduit to Be Run Thru Walls.Fire Watch Established Per Tech Specs | Fire Watch |
| ML20148P415 | 20 November 1978 | /03L-0 on 781102:reactor Maximum Cooldown Rate of 100 Degrees F Exceeded During Reactor Auto Scram & Vessel Depressurization.Caused by Personnel Error;Personnel Have Been Admonished | |
| ML20197D415 | 20 November 1978 | /01T-0 on 781109:suppression Chamber to Drywell Vacuum breaker(2T48-F323I)inoperable.Caused by mis-interpretation of Tech Specs | |
| ML20062D325 | 15 November 1978 | /03L-0 on 781101:a Main Steam Line Radiation Monitor (D11-K603D) Failed to Initiate a Half Scram During a Test.Caused by a Loose Wire Which Had Damaged Some Components | Half scram |
| ML20062D356 | 14 November 1978 | /03L-0 on 781031:surveillance of Fire Protec Equip & Circuitry(Procedures HNP-1-3356 & HNP-1-3360)had Been Neglected Due to Personnel Oversight.Importance of Fire Detector Surveillance Reemphasized to Personnel | |
| ML20197C909 | 14 November 1978 | /03L-0 on 781031:during Procedure HNP-2-10531 & Reactor in Run Mode,The 2R43-S001 C Diesel Failed to Reach 250 RPM W/In 7 Seconds,Due to Faulty Elec Speed Switch Signal | |
| ML20062D315 | 13 November 1978 | /03L-0 on 781028:at 95% Rated Pwr,Lprm Calibr OD-1 Was Performed,Changing Cmflpd from 0.97 to 1.004.Flow Was Reduced After Which Peak LHGR Was Reduced to 99% of Its Limit.Caused by Inaccurate Base Distrib in Computer | |
| ML20197D091 | 9 November 1978 | /03L-0 on 781026:32 Instru Discovered as Having Exceeded Calibr Interval.Caused by Failure of Personnel to Maintain Accurate Calibr Records.Personnel Admonished & Procedures Rev | |
| ML20197D165 | 8 November 1978 | /03L-0 on 781029:during Scram 2-78-14,2B21-NO24A Instru Switch 2 Failed to Actuate at Setpoint 111.6+/-3.6 Inches.Cause:Magnet on 2 Switch Had Metal Shavings on It. Instru Cover Was Loose & Shavings Entered Instru | |
| ML20197C941 | 7 November 1978 | /01T-0 on 781101:dimensions of Condensing Pots 2B21-D004 a & B Were Found to Be Installed Per Design Causing RCIC & HPCI High Level Trips to Exceed Tech Spec | |
| ML20150C185 | 3 November 1978 | /03l-0 on 781027:while Performing Procedure HNP-2-10315,2E41-F001 Valve Failed to Oper During HPCI Quick Start.Caused by Motor Shunt Field Insulation Failure | |
| ML20150C199 | 2 November 1978 | /03L-0 on 781018:hose Stations Were Not Inspected as Req by Tech Spec.Caused by Changeover in Procedures, Resulting in Oversight.Personnel Instructed & New Procedures Implemented | |
| ML20062C794 | 2 November 1978 | /03l-0 on 781022:severe Arcing Observed at Exciter Collector Ring of B31-S001A.A M.G. Set Tripped Before It Could Be Removed from Svc.Bolts Used to Fasten Brush Holders to Yoke Assembley Caused Brushes to Arc | |
| ML20197C019 | 27 October 1978 | /03L-0 on 781017:during Startup Testing While Calibrating APRM High Flux Scram Setpoints,Discerned That Trip Setpoints Were Set in Excess of Reg Guide Criteria. Caused by Deficiency in Procedures | |
| ML20062G279 | 30 June 1978 | /03L-1 on 780609:procedure HNP-1-3902,Safety Relief Valve Functional Test Tried Unsuccessfully on 2 Solenoids.One Failed Due to Bent Plunger;Other Failure Due to Plunger Not Properly Secured to Actuating Springs | Locktite |