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| Issue date | Title | Topic | |
|---|---|---|---|
| ML19249A530 | 23 July 1979 | LER 79-029/04T-0 on 790710:Camp Canoy 790613 Samples Showed Higher than Normal Ag-110 Levels.Caused by Introduction of More Sensitive Sampling Technique | |
| ML19249D804 | 14 September 1979 | LER 79-047/01X-0:on 790914,air Start Sys Hangers Found Not Meeting Seismic Requirement.New Hangers Will Be Installed Meeting Seismic Requirements in Approx 5 to 7 Days | |
| ML19249E394 | 17 September 1979 | LER 79-040/03L-0:on 790909,500-kV Transmission Line Taken Out of Svc from 11:50 Am to 5:21 PM to Repair Drop Line Connecting 500-kV Transmission Line to Carrier Current Line Drop.Caused by High Winds.Cable Repaired | High winds |
| ML19249E400 | 25 September 1979 | LER 79-042/04T-0:on 790911,144 Gallons of Caustic Solution Neutralized by 74 Gallons of Acid Were Discharged Via Outfall 001.Caused by Personnel Error.Affected Personnel Reinstructed in Proper Operation of Neutralization Tank | |
| ML19249E439 | 26 September 1979 | LER 79-046/03L-0:on 790827,charging Pumps of Auxiliary High Pressure Safety Injection Headers 12 & 13 Placed Out of Svc to Repair Cracked Weld on Sample Line Pipe Reducer.Crack Caused by Lack of Weld Fusion.Reducer Removed & Replaced | |
| ML19249F324 | 4 October 1979 | LER 79-048/03L-0:on 790914,during Surveillance Test, Containment Spray Pump 12 Tripped on Ground Overcurrent. Caused by Motor Stator Coils Chafing Against Incoming Phase Lead,Thus Developing Short Circuits at Coil End | |
| ML19250C343 | 20 November 1979 | LER 79-038/03L-0:on 791022,shutdown Cooling Stopped for 3 Minutes.Caused by Technician Mistakenly Removing Transmitter PT-103 from Svc,Shutting Cooling Suction Valve SI-651-MOV. Number Tags Being Added to Transmitters | |
| ML19253A819 | 6 September 1979 | LER 79-037/01T-0:on 790828,SI-4145-MOV Containment Sump Suction Valve Was Open & SI-4143-MOV RWT Suction Valve Was Closed Causing One ECCS & One Containment Spray Sys to Be Inoperable.Caused by Valve Position.Valves Repositioned | |
| ML19253B057 | 31 August 1979 | LER 79-030/03L-0:on 790805,control Element Assemblies 6,7, 49,51 & 53 Failed to Initiate Motion Inhibit Function. Caused by Drifting of Motion Inhibit Setpoint Voltage Levels.Setpoints Will Be Reduced | |
| ML19253B063 | 31 August 1979 | LER 79-032/03L-0:on 790806,12 Charging Pumps Placed Out of Svc Due to Low Suction Pressure.Caused by Faulty Pressure Indicating Switch 1-PC-224Y.Internal Parts of Switch Replaced & Pump Returned to Svc | |
| ML19253C584 | 4 December 1979 | LER 79-072/03L-0:on 791114,breaker 552-43 Tripped & Transmission Line 5052 de-energized While Breaker 552-41 Was Open.Possibly Caused by Personnel Working on Relay Panel | |
| ML19254D673 | 25 October 1979 | LER 79-053/03L-0:on 790928,actuator Arm for Shutdown Cooling Heat Exchanger Outlet Valve 11 Was Found Broken,Rendering Exchanger Inoperable.Caused by Failed Actuator Vane Arm Disconnecting Actuator from Valve Stem | |
| ML19254E548 | 26 October 1979 | LER 79-052/03L-0:on 790928,containment Gaseous & Particulate Radioactivity Monitoring Sys Failed Due to Loss of Sampling Pump.Cause Unknown.Pump Will Be Inspected & Repaired | |
| ML19254F286 | 2 November 1979 | LER 79-058/03L-0:on 791004,component Cooling Heat Exchanger 11 Removed from Svc for Corrective Maint on Operator for Heat Exchanger Salt Water Outlet Valve 1-CV-5206.Valve Would Not Open Due to Faulty Pneumatic Converter.Adjustments Made | |
| ML19256A116 | 27 October 1978 | LER 78-050/04L-0:on 781023,excessive Release of Radioactive Liquid Effluents Occurred.Caused by Clogged Strainer Causing Miscellaneous Waste Filters & Ion Exchangers to Be Out of Svc | |
| ML19256A881 | 11 January 1979 | LER 78-047/03L-0 on 781213:refueling Water Tank Narrow Range Level Indicator (Lia 4142) Was Out of Calibr & Tank Level Was Too Low.Caused by Malfunctioning Power Supply Model TA4552 | |
| ML19256E030 | 19 October 1979 | LER 79-036/03L-0:on 791004,control Element Assembly 1 Dropped to Bottom of Core.Caused by Oscillation in 15-volt Power Supply,Resulting in Dip of Output Voltage & Decreasing Holding Current of Upper Grimper | |
| ML19256E146 | 25 October 1979 | LER 79-054/03L-0:on 790929,welded Cap on Component Cooling Heat exchanges-salt Water Outlet Line Fell Off.Caused by Cap Being Carbon Steel & Not Required Red Brass or Bronze.New Red Brass Cap Was Welded in Place | |
| ML19256E473 | 2 November 1979 | LER 79-055/03L-0:on 790930,channel a Lower Positive Power Distribution Setpoint Found Decreasing.Caused by end-of-life Type Failure of Adjustment Potentiometer of Dual Potentiometer/Buffer Module Model 384612-01 | |
| ML19256E507 | 5 November 1979 | LER 79-063/04T-0:on 791022,presence of Ag-110m Detected in Camp Canoy Oyster Samples.Caused by Fluctuations in Plant Operation.Procedure Mods & Personnel Reinstruction Instituted | |
| ML19256F028 | 13 November 1979 | LER 79-064/03L-0:on 791101,fire Barriers Between Svc Bldg & Intake Structure Removed.Caused by Need to Install Two Cables.Permanent Fire Barrier Installed | Fire Barrier |
| ML19256F109 | 15 November 1979 | LER 79-060/03L-0:on 791020,while Performing Load Test of Diesel Generator 12,operator Unable to Achieve Full Load. Caused by High Exhaust Temp on Cylinder 2 & Clogged Injectors.Injectors Overhauled & Adjusted | |
| ML19256F117 | 13 November 1979 | LER 79-059/03L-0:on 791026,while Performing Routine Surveillance Insp,Two Fire Hoses Found Damaged.Cause Unstated.Hoses Replaced.Personnel Notified Not to Tamper W/Hoses | |
| ML19256F304 | 13 December 1979 | LER 79-075/04T-0:on 791129,waste Neutralizing Tank Overflowed to Ground in Unmonitored Discharge Against Environ Tech Specs.Caused by Operator Error in Reading Tank Level.Procedures Revised | |
| ML19256G474 | 20 December 1979 | LER 79-074/03L-0:on 791204,during Steady State Operation, Diesel Generator 12 Placed Out of Svc for Repair of Oil Leaks.Caused by Flare & Ferrule Fittings Coming Loose Due to Diesel Vibration.Fittings Tightened & Tubing Replaced | |
| ML19257A348 | 20 December 1979 | LER 79-070/03L-0:on 791122,during Log Readings,Discovered That Reactor Protection Sys Channel C Containment Pressure Signal Had Deviated by Greater That 0.1 Volts from Other Channels.Caused by Faulty Isolator 1-E/E-5313C | |
| ML19257A530 | 20 December 1979 | LER 79-042/03L-0:on 791127,channel Zero Gradient Pressurizer Pressure Transmitter of Engineered Safety Features Sys Placed Out of Svc to Correct Transmitter Zero Shift & Repair Condulet to Fire Sys Water Line Hanger.Transmitter Recalibr | |
| ML19257A885 | 3 January 1980 | LER 79-043/03L-0:on 791212 Channel,A Wide Range Nuclear Instrument Discovered to Be Malfunctioning.Caused by Ctr Pin in Connector Parting from Fission Chamber Extender Cable Conductor.Conductor Repaired | |
| ML19257A892 | 2 January 1980 | LER 79-080/04T-0:on 791218,discovered That Ag-11om in Oct Convoy Oyster Samples Exceeded New Background Value.Caused by Introduction of More Sensitive Technique Reducing Measured Discharge Level | |
| ML19257A918 | 3 January 1980 | LER 79-045/03L-0:on 791204,channel B Steam Generator Water Level Read Approx 15 Inches Lower than Other Three Channels. Caused by Low Output of Transmitter 2-LT-1123B Due to Deformed Differential Pressure Block Seal Diaphragm | |
| ML19257A935 | 4 January 1980 | LER 79-073/03L-0:on 791204,after Completing Weekly Testing on Diesel Generator,Associated Sequence Initiate Alarm Did Not Clear.Caused by Binding Auxiliary Switch Which Would Not Return to Open Position.Switch Replaced | |
| ML19257A942 | 4 January 1980 | LER 79-048/03L-0:on 791217,during Surveillance Testing, Iodine Filter 22 Would Not Start on Containment Isolation Sys Signal or W/Handswitch.Caused by Circuit Breaker Moving Contact Pivot Arm Not Rotating Freely as Expected | |
| ML19257B264 | 10 January 1980 | LER 79-079/03L-0:on 791219,high Differential Pressure Detected Across Filters of Fuel Pool Exhaust Fans.Caused by Excessive Buildup of Dirt on Filter Media.Maint Procedure 1-32-M-M-3 Initiated to Inspect Filters Monthly | |
| ML19257B378 | 10 January 1980 | LER 79-077/03L-0:on 791213,control Room Air Conditioning Compressor 12 Tripped & Became Inoperable.Caused by Displacement of Crankcase Oil to Evaporator Coil Due to Operation at Low Ambient Temp.Oil Recovered | |
| ML19257B396 | 8 January 1980 | LER 79-076/03L-0:on 791210,salt Water Loop 11 Removed from Svc to Perform Maint on ECCS Pump Room Air Cooler Relief Valve.Spring Found Severly Corroded.Cause Not Stated.Line Plugged.Vendor Being Contacted Re More Suitable Spring Matl | |
| ML19257B485 | 10 January 1980 | LER 79-044/03L-0:on 791212,during Surveillance Testing, Channel B Indicated Axial Flux Offset Out of Spec.Problem Intermittent.Possibly Caused by Linear Range Channel B Lower Subchannel Detector | |
| ML19257C761 | 25 January 1980 | LER 79-051/03L-0:on 791228,while Taking Log Readings, Operator Discovered Failure of Containment Gaseous Monitor. Caused by Loose Monitor Detector Cable Connector,Probably Left Unsecured After Recent Surveillance Test | |
| ML19257D839 | 25 January 1980 | LER 79-050/03L-0:on 791228,during Steady State Operation, Channel B Axial Flux Offset Read Higher than Other Channels. Caused by Detector or Integral Detector Cable Vibration | |
| ML19257D844 | 25 January 1980 | LER 79-081/03L-0:on 791225,containment Air Particulate & Gaseous Radiation Monitor Pump Tripped Off Due to Low Air Flow.Cause Undetermined.Air Flows Realigned & Readjusted. Operating Instructions Being Modified | |
| ML19259A709 | 4 January 1979 | LER 78-048/03L-0 on 781213:22B Safety Injection Tank (SIT) Pressure Was Less than 200 Psig Required by Tech Spec.3 Redundant SITs Remained Operable.Caused by Minor Valve Leakage.Corrective Action:Tank Repressurized | |
| ML19259A748 | 4 January 1979 | LER 78-042/03L-0 on 781212:number of Operable Charging Pumps Reduced to One Less than Number Required by Tech Specs. Caused by Packings of 2 Charging Pumps Reaching Their Natural End of Life Simultaneously | |
| ML19259A758 | 4 January 1979 | LER 78-058/03L-0 on 781218:during Surveillance Testing on No 11 Diesel Generator,Generator Room Ventilation Fan Failed to Start.A B Phase Overload Had Tripped & Was Reset.Tests on Fan Showed Normal Current & No Mechanical Damage | |
| ML19259B349 | 16 January 1979 | LER 78-046/03L-0 on 781217:during Surveillance,Noted That Control Element Assembly 18 Would Not Electrically Drive Down in Manual Individual or Manual Group.Caused by Inoperable Timer for Assembly | |
| ML19259B496 | 22 February 1979 | LER 79-002/03L-0 on 790208:plant Computer Failed,Causing Loss of Control Element Assembly Pulse Counting Circuit Indication;Failed Again on 790212.Caused by Problem W/Power Supply Connections | |
| ML19259C199 | 12 June 1979 | LER 79-017/03L-0 on 790515:during Overspeed testing,12 Diesel Generator Auxiliary Blowers Failed,Rendering Diesel Inoperative.Caused by Interference Between Lobes of Blower. Blower Returned to Vendor for Rebuilding | |
| ML19259D220 | 11 October 1979 | LER 79-050/03L-0:on 790924,reactor Exceeded License Limit of 2,700 Mwth.Caused by Operator Error.Power Was Reduced by Insertion of Control Element Assemblies.Operator Was Instructed of Importance of Maintaining Parameters | |
| ML19260B054 | 4 December 1979 | LER 79-065/03L-0:on 791113,diesel Generator 12 Taken Out of Svc to Inspect & Correct Governor Operation.Caused by Sludge Deposits in Governor Assembly.Governor Cleaned | |
| ML19260B076 | 4 December 1979 | LER 79-071/03L-0:on 791111,reactor Tripped Due to 500 Kv Breakers Opening & Causing Loss of 500 Kv Transmission Line 5052 & Unit 1 500 Kv Bus.Caused by Malfunctioning Solid State Relay Card in Breaker 552-43 Panel Replaced | |
| ML19260C137 | 13 December 1979 | LER 79-068/03L-0:on 791127,during Normal Steady State Operation,Emergency Diesel Generator Placed Out of Svc. Caused by Need to Replace Hoffman Air Vent Float Valve Which Failed Due to Normal Wear | |
| ML19260C908 | 25 January 1980 | LER 79-052/03L-0:on 791226 & 28,control Element Assembly Motion Inhibit Was Inoperable Due to Repairs to Metrascope. Caused by Worn Bands on Metrascope Master Alarm Card Resulting in Improper Connection W/Printed Circuit Board |