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{
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	Issue date	Title	Topic
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05000298/LER-1993-029	6 August 1993	LER 93-029-00:on 930708,partially Withdrawn Control Rod 26-31 Scrammed.Caused by RPS Scram Signal from Two of Four Reactor Pressure Scram Switches.Scram Reset & Pressure Testing completed.W/930806 Ltr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

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