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Issue date | Title | Topic | |
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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 | 20 October 1982 | 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 | |
05000298/LER-1982-014, Amended LER 82-014/03X-1:on 820607,rejectable Indications Found in Heat Affected Zones of Welds BJ-13,BJ-15,BJ-20 & BJ-23.Caused by Improper Fabrication Techniques.Affected Piping & Fittings Replaced | 3 February 1983 | Amended LER 82-014/03X-1:on 820607,rejectable Indications Found in Heat Affected Zones of Welds BJ-13,BJ-15,BJ-20 & BJ-23.Caused by Improper Fabrication Techniques.Affected Piping & Fittings Replaced | Anchor Darling Liquid penetrant |
05000298/LER-1993-001 | 18 March 1993 | LER 93-001-00:on 930225,several Design Discrepancies in SW & Reactor Equipment Cooling Sys Identified.Caused by Piping Configuration Error During Plant Const.Mechanical & Electrical Mods Will Be made.W/930318 Ltr | |
05000298/LER-1993-007 | 22 April 1993 | LER 93-007-00:on 930326,determined That ECCS Pump Compartment Cooler Power Supply Design Defect Could Have Prevented Adequate Containment Heat Removal.Caused by Design Errors.Mods Planned to Provide Convection Cooling | |
05000298/LER-1993-008 | 22 April 1993 | LER 93-008-00:on 930328,4,160-volt Breakers 1BG,1GB & 1GE Tripped Due to Actuation of 1GS Breaker Lockout Relay.Caused by Oversight in Design Change Installation Instructions. Work Stopped & Design Change Implemented | |
05000298/LER-1993-029 | 6 August 1993 | LER 93-029-00:on 930708,partially Withdrawn Control Rod 26-31 Scrammed.Caused by RPS Scram Signal from Two of Four Reactor Pressure Scram Switches.Scram Reset & Pressure Testing completed.W/930806 Ltr | |
05000298/LER-1993-030 | 9 August 1993 | LER 93-030-00:on 930708,discovered Inadequate Inservice Testing of Svc Water Sys Check Valves Due to Flow Instrument Calibr Error & Personnel Error in Specifying Sys Flow Requirement.Revised Calibr Factor developed.W/930809 Ltr | |
ML17054D241 | 13 May 1980 | Annual Financial Rept 1979 | |
ML17348B506 | 9 October 1990 | Part 21 Rept Re Zener Diode VR2 on Power Supply Board 9 1682 00 106 Possibly Being Installed Backwards | |
ML17352A869 | 31 May 1993 | Technical Rept, Assessment of Aging Degradation of Civil/ Structural Features at Selected Operating Nuclear Power Plants. | Boric Acid Coatings Operating Basis Earthquake Tornado Missile Protection Earthquake |
ML18024B543 | 23 January 1980 | LER 79-043/03L-0:on 791228,during Normal Operation,Routine Tour Indicated through-wall Crack of Weld on Discharge of a & B Radiant Energy Conversion Pump Discharge Piping.Cause Undetermined.Temporary Soft Patch Installed | |
ML18038A897 | 7 September 1994 | Part 21 Rept Re Defect in Latching Mechanism of Potter & Brumfield Relay on C&D High Voltage Shut Down Alarm Assembly Printed Circuit Boards.Pull Test on Relay Reset Button Incorporated Into Receiving Insp Procedures | |
ML18096B242 | 1 February 1993 | Part 21 Rept Re Possible Matl Defect in Stainless Steel Swagelock Tube Fittings.Initially Reported on 921218.List of Part Numbers,Heat Codes & Addl Affected Customers Encl | |
ML19207C395 | 20 August 1979 | LER 79-019/01T-0:on 790809,upon Auto Start Signal,High Pressure Coolant Injection Pump Did Not Initially Start. Caused by Deterioration of Piston Rings in Valve Actuator. Rings Replaced & Test Completed Satisfactorily | |
ML19208D422 | 7 September 1979 | LER 79-021/03L-0:on 790811,carbon Absorber in Standby Gas Treatment Sys B Was Wetted W/Water When Control Room Received Actuation Alarm for Deluge Sys.Caused by Improper Installation of Baseplate of Fire Detection Unit | |
ML19208D442 | 7 September 1979 | LER 79-022/03L-0:on 790812,water from Carbon Absorber Housing of Standby Gas Treatment Sys a Sprayed Carbon Absorber Trays,Rendering Trays Inoperable.Caused by Inadequate Seating Area Between Valve Clapper & Latch | |
ML19208D463 | 5 September 1979 | LER 79-020/03L-0:on 790809,while Performing Surveillance Procedure on Relief Valve Bellows Monitoring Sys,Pressure Switch MS-PS-71G Failed to Actuate.Caused by Improper Assembly.Switch Was Replaced | |
ML19208D488 | 7 September 1979 | LER 79-023/03L-0:on 790809,Barton Model 288 Differential Pressure Indicating Switch MS-DPIS-119B Was Found in Excess of Tech Specs Table 3.2.A.Caused by Faulty Switch. Microswitch Assembly Was Replaced | |
ML19209C463 | 8 October 1979 | Monthly Operating Rept for Sept 1979 | |
ML19210C397 | 2 November 1979 | Revised Monthly Operating Rept for Oct 1979 | |
ML19210C443 | 8 November 1979 | Monthly Operating Rept for Oct 1979 | |
ML19210D567 | 25 October 1979 | Revised LER 79-011/03L-1:on 790424,reactor Water Cleanup Contactor CR105X Auxiliary Contacts Failed During Cold Shutdown.Caused by Failure of Auxiliary Contact Mechanism. Contactor Retrofitted | |
ML19210D656 | 29 October 1979 | LER 79-027/03L-0:on 791001,during Routine Surveillance Procedure MS-DPIS-119B,switch Was Found W/Setpoints in Excess of Tech Specs.Caused by Setpoint Drift.Instrument Recalibr | |
ML19210D699 | 9 November 1979 | LER 79-029/03L-0:on 791012,during Routine Plant Tour,Pinhole Leak Detected in Upstream Weld of Supply Isolation Valve. Cause Unknown.Weld Will Be Repaired During Next Shutdown | Fire Barrier |
ML19210F013 | 20 November 1979 | LER 79-030/03L-0:on 791021,while Pumping Water from Torus to radwaste,drywell-to-torus Differential Pressure Dropped Below Tech Specs.Caused by Nitrogen Pressure Forcing Water from Downcomers to Flow to Torus | |
ML19210F016 | 21 November 1979 | LER 79-032/03L-0:on 791026,during Normal Operation,Doors to HPCI & RHR B&D Pump Rooms Left Open W/O Fire Watch.Caused by Personnel Error.Occurrence Discussed W/Personnel Involved. Fire Doors Controlled by Procedure Posted W/Signs | Fire Watch |
ML19224D798 | 30 May 1979 | LER 79-012/03L-0 on 790503:vessel Water Temp Increased to 220 F W/Primary Containment Integrity Not Established.Caused by Omission in Operating Procedures.Setpoint of Interlock Verified & Procedures Revised | |
ML19224D803 | 23 June 1979 | LER 79-015/03L-0 on 790525:breaker 1AS Failed to Close Automatically.Caused by Improper Operation of Switch 52 in Breaker 1AN.Switch Contacts Cleaned & Tested Satisfactorily | |
ML19224D808 | 30 May 1979 | LER 79-013/03L-0 on 790508:correct Drywell to Suppression Chamber Reading Not Established.Caused by Leaking Inlet Purge Valve.Valve Repaired & Leak Tested | |
ML19224D819 | 8 June 1979 | LER 79-014/03L-0 on 790509:chamber Vent Valve for Torus Level Transmitter Was Left Closed.Caused by Technician Error.Vent Valve Opened & PC-LT-12 Placed Back Into Svc | |
ML19242A395 | 26 June 1979 | LER 79-016/03L-0 on 790531:RHR Pump 1A Tripped During Start on Overcurrent in Phase C.Caused by Failure of GE Model 121AC66K8A Overcurrent Relay Operating Disc to Return to Normal Position.Relay Cleaned,Recalibr & Retested | |
ML19242B488 | 19 July 1979 | LER 79-017/03L-0 on 790620:during Review,Observed That Surveillance Procedure 6.2.4.1 Did Not Include Daily Check of Undervoltage Relays or Monthly Functional Testing. Cause Unstated.Procedures Revised | |
ML19242D263 | 3 August 1979 | Monthly Operating Rept for Jul 1979 | |
ML19246B572 | 9 July 1979 | Monthly Operating Rept for June 1979 | |
ML19249C431 | 6 September 1979 | Monthly Operating Rept for Aug 1979 | |
ML19250B966 | 28 September 1979 | LER 79-025/03L-0:on 790912,HPCI Turbine Stop Valve Separated from Actuator at Split Coupling.Caused by Improperly Mfg Split Coupling.Split Coupling Replaced & Installation Procedures Revised | |
ML19250C024 | 28 September 1979 | LER 79-024/03L-0:on 790831,surveillance Testing Pressure Switch NBI-PS-55D Found W/Trip Point Below Tech Specs.Cause Not Stated.Switch Readjusted to Proper Setpoint & Then Replaced After Unsatisfactory Performance | |
ML19250C034 | 9 October 1979 | LER 79-026/03L-0:on 790912,investigation Found Unidentified Drywell Leak on Reactor Recirculation Pump B.Caused by Failure of Pump Seal at Natural End of Life.Seal Replaced.No Further Action Planned | |
ML19256G530 | 6 December 1979 | LER 79-033/03L-0:on 791109,surveillance Procedure Re Diesel Generator Operability Not Performed on Diesel Generator 1. Personnel Under Impression Diesel Generator 2 Would Not Be Made Operable.Test Performed Following Day | |
ML19256G533 | 12 December 1979 | LER 79-037/03L-0:on 791113,diesel Generator 1 Failed to Start.Caused by Silencer Bypass Solenoid Stopping in mid- Position Due to Insufficient Air Supply.Valve Opened & Air Supply Capped.Sys Will Be Modified | |
ML19256G537 | 10 December 1979 | LER 79-036/03L-0:on 791110,four Cylinder Sleeves in Diesel Generator 2 Damaged During Surveillance Test.Cause Under Investigation.Damaged Parts Replaced & Cylinders Inspected | |
ML19256G546 | 6 December 1979 | LER 79-034/03L-0:on 791107,base for Diesel Generator 2 Lube Oil Header to Cam Chain Tensioner Broke.Caused by Hose Proximity to Cam Chain & Tensioner Sprocket.Hose Replaced & Clamped Away from Cam Chain | |
ML19256G568 | 7 December 1979 | LER 79-035/03L-0:on 791109,during Core Spray Operability Surveillance procedure,CS-MO-12A Valve Would Not Open Electrically.Caused by Failure of Axial Movement on Worm Set Clutch Collar.Valve Repaired | |
ML19257B938 | 11 January 1980 | LER 80-001/01T-0:on 800102,during HPCI Turbine Stop Valve Monitor Test,Procedural Steps Were Improperly Completed. Caused by Personnel Error.Occurrence Discussed W/Operations & Instrument Personnel | |
ML19257C558 | 4 January 1980 | LER 79-041/03L-0:on 791206,during Surveillance Testing of HPCI DCIS-76 & 77,HPCI DPIS-76 Went Downscale After Being Placed Back in Svc.Caused by Technician Error.Signal Reset, Valves Opened & Technician Cautioned | |
ML19257C589 | 28 December 1979 | LER 79-038/03L-0:on 791130,during Normal Operation, Suppression Chamber Level Instrument PC-LI-12 Failed Downscale.Caused by Failure of Power Supply.Power Supply Replaced & Proper Indication Verified | |
ML19257C615 | 16 January 1980 | LER 79-042/03L-0:on 791223,during Routine Check,Rhr Pump 1D Breaker Found Not Charged.Rhr Pump 1D Could Not Operate. Caused by Loose Screw Holding Wire on Latch Monitoring Switch Preventing Charging Motor Operation.Tightened Screw | |
ML19257C621 | 28 December 1979 | LER 79-039/03L-0:on 791129,suppression Chamber Inboard Vent Isolation Valve PC-230MV Not Operable W/Control Switch & No Position Indication Observed in Control Room.Caused by Random Failure.Rotor Replaced W/Qualified Part | |
ML19257C640 | 2 January 1980 | LER 79-040/03L-0:on 791203,while Performing Maint on Backwash Line for Svc Water Pump Strainer,Execessive Erosion Noted in Pressure Boundary Piping.Caused by High Water Velocity & Solids Content of Backwash Line | |
ML19259A785 | 31 December 1978 | Monthly Operating Rept for Dec 1978 |