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{
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	Issue date	Title	Topic
ML19296A704	8 February 1980	LER 80-003/03L-0:on 800110,repairs to Number 21 Diesel Generator Jacket Coolant Sys Required Diesel Be Out of Svc. Caused by Leaking Gasket on Jacket Cooling Water Discharge Header.Leak Located & Repaired
ML19296C253	12 February 1980	LER 80-007/01T-0:on 800129,during Core Flush W/Rcs at 258 Psig,Relief Valve RC-404-ERV Opened.Apparently Caused by Spurious High Pressure Signal from Transmitter PT-103-1 When Technician Removed Cover of Transmitter During Review
ML19296C829	27 February 1980	LER 80-009/03L-0:on 800201,during Surveillance Testing, Discovered Hose for One of Two Containment Elevator Hose Stations Missing.Caused by Work Group Using Fire Sys for Cleaning Purposes on Elevation of Containment
ML19296D117	19 February 1980	LER 80-004/03L-0:on 800121,during Steady State Operation, Received Indication of Several Spurious Loss of Load Trips on Channel B.Cause of Event Unknown.Troubleshooting Revealed Electrical Noise on Input Leads
ML19296D129	22 February 1980	LER 80-005/03L-0:on 800122,five Channel B Trip Units Were Bypassed Due to Spurious High Power Levels.Caused by Noise from Excore Nuclear Instrument Upper Subchannel Detector. Troubleshooting Planned for Next Cold Shutdown
ML19296D134	22 February 1980	LER 80-006/03L-0:on 800126,during Steady State Operation, Reactor Protective Sys Channel a High Power,Low Flow,Axial Flux Offset & Thermal Margin/Low Pressure Trip Units Bypassed for Corrective Maint.Meter Input Jacks Cleaned
ML19296D306	25 February 1980	LER 80-008/03L-0:on 800126,while Cooling Down for Scheduled Outage,Survey Technician Discovered Steam Blowing from 11A Reactor Coolant Pump.Sensing Line lPDT-123A Had through-wall Leak.Caused by Friction of Sensing Line W/Another Pipe	Through-Wall Leak
ML19296D522	26 February 1980	Notifies That LER Number 50-317/79-78 Was Not Used for 1979
ML19305B325	12 March 1980	LER 80-011/01T-0:on 800227,while Testing Diesel Generator 21,unit Failed to Reach Rated Speed in 10-s or Less.Caused by Slow Response of Diesel Generator Governor.Governor Replaced & Will Be Inspected & Overhauled by Manufacturer
ML19305C368	19 March 1980	LER 80-012/03L-0:on 800219,during Routine Surveillance,Small Leak Discovered on Charging Pump Common Suction Header Relief Valve.Caused by Vibration Induced Metal Fatigue in heat-affected Zone of Welded Penetration in Header
ML19305D759	10 April 1980	LER 80-017/03L-0:on 800316,saltwater Svc Water Heat Exchanger 22 Was Taken Out of Svc.Caused by Need to Repair Tube Leak.Tube Leak Found & Plugged
ML19305D850	10 April 1980	LER 80-014/03L-0:on 800310,during Surveillance Testing, Reactor Core Drain Tank & Quench Tank Oxygen Sample Valves Failed to Shut on Safety Injection Actuation Signal.Caused by Corrosion on Output Relay Terminals
ML19305D859	10 April 1980	LER 80-018/03L-0:on 800311,during Routine Insp Tour,Watch Stander Noticed Leak Weld on 23 Charging Pump Suction Relief Valve Causing Degradation of Sys Designed to Contain Radioactive Fluid.Caused by vibration-induced Metal Fatigue
ML19305E797	16 May 1980	LER 80-026/03L-0:on 800428,pressurizer Level Control Channels LT-110X & LT-110Y Were Removed from Svc After Erratic Changes in Pressurizer Level Occurred.Caused by Leaking Drain Valves in Transmitter 2-LT-110Y.Valves Shut
ML19305E820	16 May 1980	LER 80-023/03L-0:on 800416,while 21 Diesel Generator Was Being Taken Off 24 4 Kv Bus Following Test,Two 15 Vdc Power Supplies Had No Output.Caused by Tripped Overvoltage Protection Modules
ML19305E875	16 May 1980	LER 80-025/03L-0:on 800428,during Steady State Operation, Channel a Trip Functions Were Bypassed in Accordance W/Tech Specs.Bypass Necessary to Determine Cause of Erratic Channel a Computer Flow Alarms.Caused by Defective Thermocouple
ML19309A796	25 March 1980	LER 80-001/03L-0:on 800225,although Low Pressure Safety Injection Pump 21 Was Placed Out of Svc for Maint, Containment Spray Pump 21 Was Disassembled.Caused by Verbal Communication Error
ML19309A809	28 March 1980	LER 80-016/03L-0:on 800303,emergency Diesel Generator 21 Was Placed Out of Svc After It Failed to Reach Rated Speed During Start Test.Caused by Diesel Generator Governor Slow Response.Governor Replaced,All Governors Inspected
ML19309A822	25 March 1980	LER 80-019/02L-0:on 800312,while Performing QC Insp,Cable A2Y0929P Was Found Incorrectly Routed,Which Violated Cable Separation Criteria.Caused by Personnel Not Following Designed Routing of Cable.Temporary Cable Installed
ML19309A829	25 March 1980	LER 80-015/03L-0:on 800227,during Maint,Control Element Assembly 44 Dropped Into Core.Caused by Electrician Accidentally Grounding Prime 15 Volt Power Supply.Faulty Backup Power Supply Was Changed
ML19309A866	25 March 1980	LER 80-013/03L-0:on 800225,while Performing Surveillance Test,Channel D Containment High Pressure Trip Setpoint Was Less Conservative than Value Given in Tech Specs.Caused by Failed Signal Isolator 1-E/E-5313D
ML19309A873	24 March 1980	LER 80-010/03L-0:on 800224,during Surveillance Testing, Control Element Assemblies 31 & 34 Dropped Into Core.Caused by Fault in Timer Module.Module Replaced
ML19309C350	2 April 1980	LER 80-013/03L-0:on 800303,channel Zf Pressure Input Signal for Steam Generator Isolation 22 Was Bypassed.Caused by Signal Isolater 2-E/E-1023C Being Out of Calibr Due to Nonlinear Response
ML19309C370	3 April 1980	LER 80-002/04T-0:on 800322,instantaneous Hourly Average for Condenser Temp Rise Observed in Excess of Tech Spec Limit. Caused by Operator Inattention to Temp Rise Across Condenser & Environ Conditions
ML19309E548	17 April 1980	LER 80-015/03L-0:on 800317,steam Generator Auxiliary Feed Pump 11 Was Taken Out of Operation.Caused by Sightglass Being Broken by Operator Taking Oil Sample for Analysis. Broken Glass Replaced
ML19309E626	16 April 1980	LER 80-021/04T-0:on 800404,during Preventive Maint for Draining Condensate from Fuel Oil Storage Tank,Operator Drained Oil Instead of Water.Caused by Operator Inability to Discern Difference Between Oil & Water Through Bullseye
ML19309E664	18 April 1980	LER 80-021/03L-0:on 800318,during Performance of Surveillance Test 23,saltwater Pump Did Not Start Upon Receipt of Safety Actuation Signal.Caused by Faulty Pin. Pin Replaced
ML19309F363	25 April 1980	Updated LER 79-001/03X-1:on 790106,RCS Had Unidentified Leakage of 1.546 Gpm,Exceeding Tech Spec.Caused by Cracked Weld Located on Socket Weld Downstream of Second Isolation Valve.Weld Repaired
ML19309F377	25 April 1980	LER 80-005/03L-0:on 800325,during Normal Operation,Control Room Air Conditioning Unit 12 Tripped.Caused by Failure of Diaphragm on Unipressure Valve.Valve Replaced & Unit Returned to Svc
ML19309F384	25 April 1980	LER 80-016/03L-0:on 800325,during Surveillance Testing, Channel a Wide Range Nuclear Instrument Did Not Respond in Calibr Mode.Apparently Caused by Failure of Channel Preamplifier.Power Supply Replaced W/Spare
ML19309F400	25 April 1980	Updated LER 79-003/01X-2:on 790120,reactor Coolant Pump 22A Lower Seal Temp Alarm Activated & 2 Gpm Increase in Leak Rate Noted.Reactor Manually Tripped.Caused by Cracked Weld on Seal Pressure Sensing Line.Seal Assembly Replaced
ML19309F418	25 April 1980	Updated LER 79-052/03X-1:on 790928,containment Gaseous & Particulate Radioactivity Monitoring Sys Failed Due to Loss of Sampling Pump.Caused by Normal end-of-life Failure of Graphite Particles Depositing on Bearings
ML19309F423	25 April 1980	Updated LER 80-011/03X-1:on 800208,w/RCS at 130 Degrees & 250 Psia,Shutdown Cooling Suction Header Relief Lifted & Failed to Reset.Caused by Personnel Error.Valve Reset
ML19309F449	25 April 1980	LER 80-019/03L-0:on 800327,during Normal Operation,Channel B Loss of Load Trip Occurred Intermittently.Caused by Auxiliary Master Trip Relay end-of-life Type Failure
ML19309F469	25 April 1980	LER 80-022/01T-0:on 800415,util Informed of Possible Deficiency in FSAR Section 14.3,boron Dilution Incident,For Case When RCS Is Drained to Hot Leg w/1% Shutdown Margin. Cause Not Stated.Procedures Changed	Shutdown Margin
ML19309F490	25 April 1980	LER 80-017/03L-0:on 800326,results of Surveillance Test Indicated That ECCS Exhaust Filter Train Charcoal Did Not Demonstrate Removal Efficiency of 90% or Higher for Radioactive Methyl Iodide.Caused by Age of Filters
ML19309G422	30 April 1980	LER 80-018/03L-0:on 800401,Number 11 Control Room Air Conditioning Unit Taken Out of Operation for Maint.Caused by Need to Calibr Outside Air Temp Transmitter 0-TT-5350. Transmitter Calibr & Placed Back in Svc
ML19309G436	30 April 1980	Updated LER 80-013/03X-1:on 800225,during Surveillance Test, Channel D Containment High Pressure Setpoint Less Conservative than Tech Specs.Caused by Failed Signal Isolator 1-E/E-5313D.Instrument Returned for Repair
ML19309G445	30 April 1980	LER 80-022/03L-0:on 800412,charging Pump 23 Removed from Svc to Repair Weld on Suction Relief Valve.Leak Caused by Vibration Induced Metal Fatigue in Heat Affected Zone of Weld.Leak Repaired & Mods Approved for Charging Pumps
ML19312E384	2 June 1980	LER 80-027/03L-0:on 800506,during Performance of Surveillance Testing,Discovered Channel B Axial Flux Offset Not Indicating Properly.Caused by Dirty Connector on Deviation Card A-5.Connector Cleaned
ML19312E503	30 May 1980	LER 80-024/03L:on 800430,while Making Containment Insp, Discovered Cracked Weld on 11B Reactor Coolant Pump Control Bleedoff Line.Caused by Metal Fatigue Induced by Vibration. Pipe Replaced & Weld Repair Performed
ML19312E511	2 June 1980	LER 80-028/03L-0:on 800512,during Steady State Operation, Discovered Plant Computer Had Failed.Caused by I/O Power Failure Due to Generation of Noise Spike
ML19318A091	13 June 1980	LER 80-028/03L-0:on 800515,during Performance of Routine Test,Diesel Generator 12 Failed to Reach Rated Speed in Less than 10-s Until Third Attempt.Caused by Intermittent Female Pin & Crack in Bakelite Spacer of Anphenol Connector
ML19318A124	13 June 1980	LER 80-031/03L-0:on 800522,containment Gaseous & Particulate Radiation Monitors Failed.Caused by Electrician Accidently Grounding Motor Phase,Causing Pumps to Trip.Control Circuit Failed Due to Armature Not Being Replaced in Solenoid Valve
ML19318A131	13 June 1980	LER 80-029/03L-0:on 800515,during Routine Surveillance Test, Reactor Coolant Hot Leg Sample Valve Indicated Intermediate Position.Valve Position Could Not Be Verified.Cause Not Determined
ML19318A148	13 June 1980	LER 80-030/03L-0:on 800517,containment Gaseous & Particulate Monitors Failed Due to Ground in Instrument Control Power. Caused by Water in Plant Page Unit.Monitor Pumps Bridged to Keep Pumps Running While Trouble Shooting Continued
ML19321A759	18 July 1980	LER 80-030/03L-0:on 800618,primary Sample Valve 1.CV-5467 Indicated Intermediate Position & Fully Shut Position Could Not Be Verified.Cause Cannot Be Determined by Remote Means. Corrective Action to Be Performed During Shutdown
ML19322A075	22 December 1978	LER 78-057/04T-0 on 781216:during Normal Operation While Regenerating 11 make-up Water Demineralizers,Approximately 172 Gal of Caustic Solution Were Discharged Via Outfall 001. Caused by Inadvertent Operator Action
ML19323A095	14 April 1980	LER 80-020/03L-0:on 800314,while Operating at 98% Power,Fire Marshall Discovered Fire Barrier Penetration Between Cable Spreading Room & Turbine Bldg Not Sealed W/Flamastic Fire Retardant Matl.Caused by Inaccessible Location	Fire Barrier Fire Protection Program Fire Watch
ML19323C016	7 May 1980	LER 80-025/04T-0:on 800307,environ Samples Collected & Analyzed in Accordance W/Ets,Confirmed Measured Levels of Radioactivity in Excess of Ten Times Background Value.Caused by Use of More Sensitive Background Value

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