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 Issue dateTitleTopic
ML19317F3424 April 1978LER 78-003/03L-0:on 780301,during Performance Test,Control Rod Group 5 Experienced Momentary Loss of Power.Cause Undetermined.Mod to Increase Rod Control Power Source Reliability Planned for All Units
ML19322C1603 February 1978LER 78-001/03L-0:on 780105,Valve FDW-108 Failed to Close After Sample Removal.Similar Valve Failures Occured Previously.Probably Caused by Inability to Withstand environ.FDW-1-6,108 Replaced W/Appropriately Designed Valve
ML19338D58719 September 1980LER 80-014/03L-0:on 800822,concentrated Boric Acid Storage Tank Pump Removed from Svc Due to Oil & Flange Leaks.Caused by Torn Oil Seal,Worn Worm Gear,Bad Flange Gasket & Stuck Pressure Relief Valve.Items ReplacedBoric Acid
Shutdown Margin
ML19340A13621 April 1978LER 78-010/03L-0:on 780322,no Flow Found Through B LPIS Cooler During Performance Test.Caused by Broken Valve Position Indicator.Valve Opened & Indicator Repaired
ML19340A15019 April 1978LER 78-009/03L-0:on 780320,valve HP-24 Failed to Open When Manually Actuated During Performance Test.Caused Probably by Dirt on Operator Contacts.Contacts Cleaned & Valve Operated Properly
ML19340B9376 November 1980LER 80-022/01T-0:on 801011,four Holes Were Knocked in Fire Barrier Between Cable Spread Room & Turbine Bldg W/O Establishment of Hourly Fire Watch.Caused by Failure to Provide Proper Notificaion.Hourly Fire Watch EstablishedFire Barrier
Hourly Fire Watch
ML20005A3149 April 1981LER 81-004/03L-0:on 810304,motor Driven Emergency Feedwater Pump 2B Was Declared Inoperable Due to Arcing in Motor.Cause Unknown.Motor Was Disassembled & Failure Found in Coil Slot
ML20005A42410 March 1981LER 80-040/01T-0:on 801226,removable Instrument Assembly 40 Count Rate Increased,Apparently Due to Leak in once-through Steam Generator Tube.Caused by High Cycle Fatigue.Tube Replaced.Leak Procedure Implemented
ML20005A79325 February 1981LER 81-002/01T-0:on 810211,electrical Penetration EMV-2 Could Not Be Pressurized.Caused by Leak at Interior Bushing. Penetration to Be Repaired or Replaced During Next Outage
ML20005A80424 February 1981LER 81-003/03L-0:on 810125,dc Input Fuse in 1DID Vital Inverter Blew,Causing Inverter to Lose Power source.1DIB Inverter Tripped When Ac Output Breaker Apparently Opened. 1DID Trip Caused by Blown Fuse.Cause of 1DIB Trip Unknown
ML20005A82413 March 1981LER 81-004/03L-0:on 810212,primary Level Indication for Elevated Water Storage Tank Was Declared Inoperable Following Low Water Level Alarms.Caused by Loose Connectors on Air Compressor Starter Terminals.Connections Tightened
ML20005A8729 March 1981LER 81-005/01T-0:on 810222,low Power Injection Check Valve Discovered Leaking Excessively During Intersystem LOCA Leak Test.Caused by Buildup of Crud in Pivot Gap Area.Disc Hinge & Hinge Pin Replaced.Crud to Be Analyzed
ML20009C09113 May 1981LER 81-006/03X-1:on 810409,valve 2PR-8 Failed to Open During on Line Engineering Safety Testing.Caused by Faulty Valve Operator Diaphragm.Valve 2PR-8 Repaired & Verified Operable
ML20009C09819 February 1981LER 80-016/03L-1:on 801123,fire Detectors String B-2 Went Into Alarm Condition.Caused by Dust Buildup in Detector. Detector Cleaned & Verified Operable
ML20009C1075 June 1981LER 81-009/03L-0:on 810507,containment Isolation Valve 3CS-6 Was Discovered in Intermediate Position,Resulting in Loss of Containment Integrity.Cause Undetermined.Valve 3CS-6 Verified Operable
ML20009C11517 June 1981LER 81-011/03L-0:on 810518,safety-related Mechanical Snubber Was Discovered Inoperable During Visual Insp.Caused by Ball Screw Shaft of Snubber Being Slightly Scored,Prohibiting Ball Bearings from Running Smoothly.Snubber Replaced
ML20009C12219 June 1981LER 81-001/03X-1:on 810120,discovered That Low Pressure Svc Water Was Not Flowing to HPI Pump 2A.Caused by Blockage Due to Crud Buildup.Portions of Carbon Steel Piping Will Be Replaced W/Stainless Steel
ML20009C13610 June 1981LER 81-003/01X-1:on 810226,steam Generator B Was Pressurized to 550 Psig.Caused by Procedural Deficiency.Valves Opened to Lower Once Through Steam Generator Pressure.Condensate & Feedwater Procedure Will Be Revised
ML20009C14810 June 1981LER 81-008/01T-0:on 810513,loss of Valve Position Noticed. Valve CCW-8 Determined to Be Electrically Inoperable.Caused by Open Circuit in Several Conductors in Control Cable. Control Cable Replaced & Valve Electrically Cycled
ML20009C15416 June 1981LER 81-010/03L-0:on 810517,broken Airline to Valve 3LPSW-525 Was Discovered.Caused by Breakage of Brass Nipple Between Air Supply Isolation Valve & Accumulator Tank.Brass Nipple Replaced
ML20009C1584 March 1981LER 81-005/01T-0:on 810318,four Closure Studs on Reactor Coolant Pump 2A2 Had Corrosion Wastage in Pump Closure Area. Caused by Leakage from Pump Closure Gaskets.Stud 20 Replaced.Studs 1,2 & 3 Left in PlaceTime of Discovery
ML20009C1815 June 1981LER 81-012/03L-0:on 810506,turbine Driven Emergency Feedwater Pump Oil Sump Was Discovered Empty.Cause Unknown. Pump Control Switch Placed in Locked Out Position to Prevent Automatic Start of Pump.Oil Level Restored
ML20009C2138 May 1981LER 81-006/03L-0:on 810409,valve 2PR-8 Failed to Open During on-line Insp.Caused by Faulty Valve Operator Diaphragm.Valve Repaired & Verified Operable
ML20009C2348 June 1981LER 81-008/03L-0:on 810508,solenoid Valve for 2FDW-316 Stuck in Manual Position,Disabling Automatic Level Control of B Steam Generator from Emergency Feedwater Sys.Valve Replaced Per Procedure
ML20009C3138 May 1981LER 81-007/01T-0:on 810410,fire Barrier Door for West Penetration Room Was Inoperable W/O Proper Fire Watches Maintained.Caused by Personnel Error.Individual Involved Counseled Re Importance of CommunicationFire Barrier
ML20009C32315 May 1981LER 81-009/03L-0:on 810415,during Low Pressure Svc Water Pump Periodic Test,Valves 2LPSW-19 & 2LPSW-21 Were Closed Resulting in RB Rbcu Being Out of Svc.Caused by Personnel Error.Valve 2LPSW-19 Opened & Personnel Counseled
ML20009C36812 March 1981LER 81-003/01T-0:on 810226,B Steam Generator Was Pressurized to 550 Psig.Caused by Procedural Deficiency. Once-through Steam Generator Pressure Lowered.Procedures for Opening Startup Block Valves Will Be Revised
ML20009F50114 July 1981LER 81-013/01T-0:on 810630,backup Function of Isolating & Transfer Diodes in Instrumentation & Control Sys Disabled on All Channels on All Units.Caused by Misinterpretation of Tech Specs.Proposed Tech Spec Change Initiated
ML20009F5132 July 1981LER 81-010/03L-0:on 810602,turbine Driven Emergency Feedwater Pump Declared Inoperable.Caused by Governor Valve Sticking in Open Position Due to Sys Contamination.Linkage Pin Removed,Governor Valve Freed & Stem Cleaned
ML20009F90923 July 1981LER 81-011/01T-0:on 810715,during Visual Exam of Reactor Vessel Internal Components,Thermal Shield Bolts & Guide Block Discovered Missing.Cause Not Determined.Program Defined to Determine Cause & Effect Repairs
ML20009G08726 June 1981LER 81-013/03L-0:on 810528,1-inch Breach Discovered in 3-h Fire Barrier in Floor of Control Room Outside Shift Supervisor Ofc.Cause Undefined Due to Breach Being Covered Since Const of Control RoomFire Barrier
ML20009G47122 July 1981LER 81-009/03L-0:on 810622,during Normal Operations,Startup Transformer CT-1 Locked Out.Cause Not stated.CT-1 Transformer & Bus Work Checked & Protective Relaying Checked for Malfunction Prior to Return to Svc
ML20009G63324 July 1981LER 81-012/03L-0:on 810624,discovered safety-related Hydraulic Snubber on Atmospheric Dump Line B Was Broken at Rod Eye.Caused by Vibration.Snubber RepairedEarthquake
ML20009G77424 July 1981LER 81-012/03L-0:on 810624,valve 3PR-8 Failed in Closed Position,Isolating Radiation Monitors 3 RIA-47,48 & 49. Caused by Ruptured Diaphragm in Air Operator on Valve. Diaphragm Replaced
ML20010D23717 August 1981LER 81-015/01T-0:on 810720,while Attempting to Perform Engineered Safeguard Periodic Test,Low Pressure Injection Pump 3-B Failed to Start.Caused by Personnel Error.Pump Motor Bearings Replaced & Personnel Counseled
ML20010E77825 August 1981LER 81-015/01T-0:on 810811,modules in Reactor Protection Sys Were Found to Have Errors Larger than Originally Calculated Values.Errors re-evaluated & Setpoints Changed to New Settings
ML20010F45131 July 1981LER 81-014/01L-0:on 810717,A & B High Pressure Svc Water Pumps Discovered W/O Control Power Indication & Elevated Water Storage Tank Showed Zero Level.Caused by Control Breaker Source a & B Breakers Being Open & Blown Fuse
ML20010F8284 September 1981LER 81-011/03L-0:on 810806 & 07,RCS Subcooling Margin Monitor Was Inoperable & Backup Method Unavailable.Caused by out-of-svc Unit 2 Operator Aid Computer Due to Malfunction of AGRA2 Group Relay Board & Matrix Card
ML20010H92214 September 1981LER 81-013/03L-0:on 810815,reactor Bldg Spray Pump 2A Declared Inoperable Due to Oil Leak on Bearing Oil Reservoir.Caused by Loose Piping Allowing Leakage.Reservoir Refilled W/Oil
ML20010J02317 September 1981LER 81-016/01T-0:on 810903,magnetic Particle Testing on 1A2 Reactor Coolant Pressure Seal Housing Bolts Revealed Linear Indications.Bolts W/Rejectable Indications Will Be Replaced
ML20011A74720 October 1981LER 81-018/03L-1:on 810911,safety-related Battery Surveillance Procedures Found Out of Compliance W/Revised Tech Spec 4.6.9.Caused by Personnel Failure to Identify Necessary Procedure Changes.Procedures Revised
ML20023C44622 April 1983LER 83-012/01T-0:on 830408,emergency Discharge Valve to Keowee Tailrace CCW-8 Opened W/O Command,Rendering Condenser Circulating Water Emergency Discharge Sys Inoperable.Caused by Shorted Conductor.Conductor Replaced
ML20023C7115 May 1983Updated LER 83-012/01T-1:on 830421,emergency Discharge Valve to Keowee Tailrace CCW-8 Opened W/O Command,Rendering Condenser Circulating Water Emergency Discharge Sys Inoperable.Caused by Component Failure
ML20024B98830 June 1983LER 83-008/03L-0:on 830531,motor Driven Emergency Feedwater Pump Became Inoperable When Power Removed from Circuitry for Repair of Automatic Initiation Switch 2PS-388.Caused by Component Failure.Switch Replaced & recalibr.W/830630 Ltr
ML20024C42324 June 1983LER 83-011/03L-0:on 830525,lockout Indication Received for Startup Transformer CT3.Cause unknown.CT3 Energized. W/830624 Ltr
ML20027B46210 September 1982LER 82-009/01T-0:on 820804,during Refueling Insp of Reactor Coolant Pump,Five Closure Studs Found Degraded in Size Below Tech Spec Min.Caused by Boric Acid Corrosion Due to Closure Gasket Leakage.Studs ReplacedBoric Acid
ML20027B83921 September 1982LER 82-011/03L-0:on 820822,erratic Indication Observed on Channel a Borated Water Storage Tank Level Instrumentation. Caused by Boiling Water in Level Transmitter Line.Heat Tracing Disconnected & Transmitter Lines Refilled
ML20027D63328 October 1982LER 82-018/01T-0:on 821014,three of Six Installed Safety Valves Determined to Have Degraded Performance Based on Valve Ring Settings.Cause of Difference in Ring Settings Unknown.Valves Reset Using EPRI Tested Settings
ML20027D8543 November 1982LER 82-011/03L-0:on 821004,while Inspecting Snubber Installed on 821002,mechanic Found Snubber Inoperable.Caused by Misreading of Hanger Sketch.Snubber Removed,Tested & Reinstalled
ML20028D1776 January 1983LER 82-019/03L-0:on 821207,valve 1HP-25 Failed to Open Remotely During Operational Valve Function Test.Caused by Component Failure.Valve Manually Cracked Open,Cycled & Stroke Tested
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