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 Issue dateTitleTopic
ML19246C14325 June 1979LER 79-013/03L-0 on 790625:during Normal Operation,Hot Leg Temp Indications C/TI-122H Failed Low.Caused by Power Supply Failure Due to Blown Fuse.Ge/Mac Power Supply Model GR700 Replaced & Sys Returned to Normal
ML19249A2519 August 1979LER 79-018/03L-0 on 790724:steam Generator a Pressure Indicator Ccontroller for C Channel Would Not Reset.Caused by Failure of Sigma Meter Integrally Installed Trip Setpoint.Trip Circuit Replaced & Meter Calibr
ML19257D43824 January 1980LER 79-020/03L-2:on 791229,during Continuing Insps of Accessible Piping,Two Addl Snubbers on Safety Injection Sys Piping Found Inoperable.Caused by Improper Installation of Anchor Bolts.Redesigned Modified Baseplate InstalledEarthquake
ML19257D45023 January 1980LER 80-002/01T-0:on 800117,while Performing Surveillance Test ST-SI/CS-1,containment Sump Safety Injection Recirculation Valve HCV-383-4 Failed to Close from Control Room Switch.Caused by Binding Auxiliary Interlock
ML19259A7712 January 1979LER 78-045/01T-0 on 781220:during Plant heatup,1 Pressure Channel for Power Operated Relief Valve (PORV) Sys Was Responding.Operator Pulled Recorder Fuses Causing PORV Valves to Open,Then Closed Them to Terminate Transient
ML19260B20614 November 1979LER 79-021/21L-0:on 791106,during Insp Required by IE Bulletin 79-14 Re safety-related Piping Sys,Discrepancies Found Between Design Documents & as-built Configuration of Seismic Restraints.Caused by Probable QC Installation Error
ML19260D9776 February 1980LER 80-004/01T-0:on 800126,while Fire Barrier Inside Empty Breaker Cubicle Was Degraded to Pull in New Cabling,Fire Watch Was Not Maintained Continuously.Caused by Fire Watch Not Receiving Accurate Info on Status of BarrierFire Barrier
Fire Watch
ML19262A9695 December 1979LER 79-020/03L-0:on 791031,during Insps of Accessible Piping,Eight Snubbers on Safety Injection Sys Piping Found Inoperable.Caused by Improper Installation of Anchor Bolts. Base Plate Redesigned & Anchor Bolts Reinstalled
ML19262C2667 January 1980LER 80-001/03L-0:800102,while Operating at Approx 98% Power, Breaker Feeding Containment Cooling Fan Motor VA-3B Tripped.Caused by Trip Units Out of Calibr.Units A&C Were Replaced,Calibr & Tested Satisfactorily
ML19263C04824 January 1979LER 79-002/03L-0 on 790117:reactor Protective Sys for Axial Power Distribution Channel a Trip Setpoint Fluctuated Nonconservatively.Caused by Bell & Howell Potentiometer Module Part 384612/001 Failure
ML19263E02322 March 1979LER 79-008/03L-0 on 790321:during Normal Operation,Loop Safety Injection Valve Failed to Open from Lockout Relay Activation.Caused by Dirty Auxiliary Interlock Switch. Switch CleanedSafe Shutdown
ML19263E21830 May 1979LER 79-016/01T-0 on 790517:testing on First Removed Irradiated Surveillance Capsule Showed Higher than Predicted Nil Ductility Transition Temp New Pressure.Temp Limitation Curves Have Been Developed
ML19263E22929 May 1979LER 79-003/03L-1 on 790127:during Containment Pressure Release,Containment Air Monitor Readings Were Abnormally Low.Caused by Closed Isolation Valves.Containment Ventilation Valves Were Closed & Pressure Valves Opened
ML19269D55816 May 1979LER 79-014/01T-0 on 790515:ASCO Solenoid Valves Lacked Sufficient Environ Qualification Data.Caused by Inadequate Specs During Design & Installation Period.Valves Will Be Replaced Following 1980 Refueling OutageSafe Shutdown
ML19270E89622 December 1978LER 78-040/03L-0 on 781205:during Performance of Type B & C Containment Leak Rate Tests,Noted That Total Leakage Exceeded Tech Spec Limits.Leakage Caused by Penetrations to Containment Purge Valves
ML19270F36331 January 1979LER 79-001/01T-0 on 790118:during Check of Diesel Driven Fire Pump,Engine Cooling Fluid Boiled Out of Holding Tank. Diesel Engine Cooling Sys Refilled & Manual Isolation Valve Found Closed.Valve Opened & Fire Pump Returned to Svc
ML19270F37429 January 1979LER 78-005/03L-1 on 780214:CH-1C Charging Pump Was Out for Maint on Leaking End Cap.Crack in Valve Block Noted.Pump Not Inoperable & Returned to Svc.Crack Due to Heavy Usage & Excessive Vibration.New Block Installed 790105
ML19270F78719 March 1979LER 79-005/03L-0 on 790226:at 15% Power C Channel Loss of Load Trip Did Not Annunciate.Caused by Bistable Multivibrator Set to 18.1%.Bistable Reset & Surveillance Test PerformedPower change
ML19273B13130 January 1979LER 78-041/03L-1 on 781207:flow Rate Deficiencies for Charcoal Filter Units Noted;Halide Removal Efficiency for VA-66 Found to Be Below 99%.Application for Amend to License Re Revision of Ventilation Flow Rate Requirements Submitted
ML19289D7468 March 1979LER 79-004/01T-0 on 790226:during Containment Insp After Outage,Weld Leak Discovered on Controlled bleed-off Line on Reactor Coolant Pump RC-3C.Caused by Vibration Induced Fatigue.Repairs Performed
ML19290E22025 February 1980LER 80-005/03L-0:on 800131,during Containment Integrated Leak Rate Test,Release to Atmosphere Occurred.Caused by Failure of Rupture Disk.Containment Pressure Monitored for Remainder of Test
ML19294B01415 February 1980LER 80-003/03L-0:on 800122,during Special 24-h Diesel Generator Test,While Attempting to Load Generator,Generator Field Went to Max Excitation.Caused by Faulty Zener Diode & Corresponding Draft in A-C Regulator PanelSafe Shutdown
ML19294B74927 February 1980LER 79-014/01T-1:on 800216,two Addl Solenoid Valves Found Not Environmentally Qualified.Caused by Inadequate Solenoid Valve Specs.Solenoids Will Be Replaced Prior to Startup
ML19310A27619 May 1980LER 80-008/03L-0:on 800515,during Check of Power Supply Trip Indicating lights,AB-1 Matrix Relay of Reactor Protective Sys Failed to Trip Clutch Power Supplies.Caused by Failure of Mercury Wetted Relay in Matrix Circuit
ML19310A29029 May 1980LER 80-009/99T-0:on 800522,during Maint on Stack Iodine Process Monitor,New Sensitivity Calibr Was Required.Caused by Use of Wrong Calibr Procedure.Training Will Be Conducted to Ensure Familiarity W/Procedures
ML19312A13219 January 1979LER 78-012/03L-1 on 781229:during Routine Maint of Charging Pump CH-1B,crack in Valve Block at Piston 3 Was Found.Caused by Excessive Vibration During Operation
ML19312D50319 March 1980LER 79-007/01T-1:on 800303,during Review Required by IE Bulletin 79-01,stem-mounted Limit Switches on HCV-864 & HCV-865 Not Found Environmentally Qualified.Caused by Inadequate Design Specs.Switches Will Be ReplacedBoric Acid
ML19312D50619 March 1980LER 79-007/01T-2:on 800305,during Review Required by IE Bulletin 79-01,limit Switches on HCV-742A/C,HCV-724 a & 725A Not Found Environmentally Qualified.Caused by Inadequate Design SpecificationsBoric Acid
ML19312D51019 March 1980LER 79-007/01T-3:on 800305,during Review Required by IE Bulletin 79-01,Barksdale Pressure Switch Not Found Environmentally Qualified.Caused by Switch Not Being Properly Specified for Intended Svc.Switch Will Be Upgraded
ML19312D89228 April 1980LER 80-006/01T-0:on 800415,as Required by IE Bulletin 79-01B,util Has Been Obtaining & Reviewing Test Data on Electrical Equipment.Samples Failed to Meet Acceptance Criteria.Caused by Steam & Moisture in Environ
ML19318C05017 June 1980LER 80-010/01T-0:on 800516,during Cold Pressure Test,Leakage Discovered at Gasket Joint Between Pump Casing & Pump Cover on Reactor Coolant Pumps RC-3A,3B & 3C.Closure Studs Corroded by Boric Acid.Leaks Caused by Deteriorated GasketsBoric Acid
Liquid penetrant
ML19318D13116 June 1980LER 80-011/03L-0:on 800528,during 1980 Refueling Outage Type B & C Containment Leak Rate Tests,Total Leakage Exceeded 0.6La Limit.Caused by Leaking Fuel Transfer Tube, Electrical,Mechanical Sleeve & Piping Penetrations
ML19321A74225 June 1980LER 80-016/03L-0:on 800621,weld on Suction Side of Pump CH-1B in Demineralized Water Flush Line Cracked.Caused by Vibration of Piping in Svc.Crack Was Ground Out & Rewelded Using Certified Procedure & Line Tested
ML19323C6197 May 1980LER 80-007/01T-0:on 800430,penetration Cable Splices for Containment Ventilation Fans Found to Lack Documentation for LOCA Qualification.Splices Will Be Coated w/LOCA-qualified Sealant
ML19325D24713 October 1989LER 89-012-01:on 890502,main Feedwater Isolation Valve to Steam Generator a Found Inoperable Due to Improperly Set Torque Switch.Caused by Inadequate Program for Maint of Motor Operated Valves.Torque Switches reset.W/891013 Ltr
ML19327B54824 October 1989LER 89-019-00:on 890924,indication of High Temp for Reactor Coolant Pump RC-3A Upper Motor Thrust Bearing Received in Control Room.Caused by Damaged Cable for Bearing Resistive Temp Device.Damaged Cable replaced.W/891024 Ltr
ML19330C34018 July 1980LER 80-015/03L-0:on 800710,during Insp,Noted That Trip Unit Setpoints on C Channel Had Become Positive Rather than Negative.Caused by Failure of 15-volt Power Supply for Trip Unit 4.Unit Calibr
ML19330C34911 July 1980LER 80-012/03L-0:on 800708,during Performance of ST-RPS-3, F.2,discovered That Trip Unit 3 Setpoints Had Drifted Out of Spec in Nonconservative Direction.Caused by Normal Setpoint Drift.Setpoints Adjusted
ML19330C3728 July 1980LER 80-013/03L-0:on 800707,during Normal Power Operation, Noted That Channel a Dc Sequencer SI-1 Had de-energized on-auto Light.Caused by Sequencer Circuitry Failure Due to Faulty RelaySafe Shutdown
ML19331B6581 August 1980LER 80-014/03L-0:on 800709,transformer T4 of Diesel Generator 1 Failed.Caused by Shorted Coil.Transformer ReplacedSafe Shutdown
ML19332E2681 December 1989LER 89-016-02:on 890616,for Unknown Period Since 890614, Auxiliary Feedwater Pump FW-10 Operated Outside Design Basis for Certain Accident Conditions.Caused by Inoperable Speed Control Loop.Action Plan implemented.W/891201 Ltr
ML19332E7438 December 1989LER 88-037-01:on 881214,one of Two Supply Headers Supplying Fire Suppression Headers in Auxiliary Bldg Isolated.Caused by Lack of Procedural Guidance & Inadequate Procedural Controls.Standing Order G-58 Will Be revised.W/891208 LtrContinuous fire watch
Hourly Fire Watch
ML19337A3175 September 1980LER 80-018/03L-0:on 800808,while Attempting to Monitor Gas Space on Vct,Inadvertent Release of Radioactive Matl to Auxiliary Bldg Environ Occurred.Caused by Deteriorated Surgical Tubing on Gas Analyzer.Tubing Replaced
ML19337A32925 August 1980LER 80-017/03L-0:on 800804,during Normal Power Operation, Personnel Discovered Setpoint Selector Switches for RMO-61, Particulate Radiation Monitor,In Wrong Position.Caused by Personnel Error While Performing Test on Radiation Monitors
ML19338E5918 September 1980LER 80-020/03L-0:on 800905,axial Power Distribution Setpoints on D Channel Discovered Out of Tolerance in Nonconservative Direction.Caused by Dependent Setpoint Selection Switch Failure.Switch Cleaned & Returned to Svc
ML19338F08811 September 1980LER 80-022/03L-0:on 800911,during Safety Injection Actuation Signal Surveillance test,86B/VIAS Lockout Failed to Trip. Caused by Burned Coil.Coil Replaced W/Spare & Tested Satisfactorily for Proper Operation
ML19338G44821 October 1980LER 80-024/03L-0:on 800926,while Completing Repairs on B Charging Pump,A Charging Pump Became Inoperable.Caused by Packing Cooling Pump Failure.Motor Replaced
ML19340B86330 October 1980LER 80-026/03L-0:on 801030,AB-1 Matrix Relay Failed to Trip Clutch Power Supplies.Caused by Failure of Matrix Circuit to Break Contact.Relay Replaced & Applicable Surveillance Test Performed to Demonstrate Operability
ML19340E26017 December 1980LER 80-031/03L-0:on 801207,during Normal Operation,Leak Developed in Weld Connecting Demineralized Water Flush Line to Discharge Manifold of Charging Pump.Caused by Probable Piping Vibration.Crack Repaired & Pump Returned to Svc
ML19341B24615 January 1981LER 81-001/01T-0:on 810114,discovered That FT-236 Changing Header Flow Lacks Complete Info to Qualify for Harsh Radiation Svc Required by IE Bulletin 79-01B.Caused by Incomplete Matls List.Transmitter Will Be ReplacedSafe Shutdown
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