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| Issue date | Title | Topic | |
|---|---|---|---|
| ML19207C433 | 5 September 1979 | LER 79-023/01T-1:on 790622,Westinghouse Notified Util That Addl Insulation to Steam Generator Level Instrumentation Impulse Lines Is Necessary to Avoid Heatup in Event of High Energy Line Break Occurring Inside Containment | |
| ML19207C446 | 6 September 1979 | LER 79-035/01T-0:on 790824,Westinghouse Notified Util of Potential Heat Sink Shorting to 7300 Rack Card Guides within 7300 Process Instrumentation & Control Printed Card Circuits.Caused by Mfg Defect.Cards Replaced | |
| ML19209A297 | 28 September 1979 | LER 79-036/03L-0:on 790903,train B RHR Relief Isolation Valves Closed When Power Was Applied to Actuators to Enable Valve Position Indication.Caused by Pulled Fuses That Forced Output Circuit to Send Signal to Close Valves | |
| ML19209A309 | 28 September 1979 | LER 79-037/03L-0:on 790906,auxiliary Bldg Battery Verification Was Two Days Late.Caused by Personnel Error. Performance of Surveillance Tests on Scheduled Dates Will Be Discussed W/Affected Personnel | Missed surveillance |
| ML19209B782 | 5 October 1979 | LER 79-021/01T-4:on 790412,found Certain Pipe Hangers Would Not Meet Structural Code Safety Margins.Caused by Inadequate Design Control.Adequacy of All Pipe Hanger Assemblies Has Been Verified | |
| ML19209C633 | 10 October 1979 | LER 79-038/03L-0:on 790912,while Performing Surveillance Test FNP-1-STP-1.0,containment Gaseous Activity Purge & Exhaust Isolation Monitor Declared Inoperable.Caused by Monitor Bypass Valve Being in Open Position | |
| ML19209C635 | 10 October 1979 | LER 79-039/03L-0:on 790924,fuel Storage Pool Area Radiation Monitor Declared Inoperable Due to Reading Discrepancy. Caused by Instrument Drift.Monitor Recalibr & Returned to Svc on 790930 | |
| ML19210D015 | 14 November 1979 | Updated LER 78-018/03L-1:on 780308,diesel Generator IC Failed to Start.Caused by Solenoid Valves Sticking Due to Corrosion Particles.Air Start Solenoid Valves Cleaned & Tested.Design Change Implemented | |
| ML19210D019 | 14 November 1979 | Updated 78-084/03L-1:on 791114,monitoring Sys Declared Inoperable After Vacuum Pump Tripped.Caused by Vibration in Low Flow Relay Unit Due to Broken Wire.Relay & Vacuum Pump/Motor Replaced & Tested | |
| ML19210D022 | 14 November 1979 | Updated LER 78-037/03L-1:on 780613,vacuum Pump Kept Tripping on Low Flow.Cause Not Stated.Vacuum Pump Replaced.Flow Trip Setpoint Not Adjusted.Design Change to Add Second Pump in Parallel Has Been Implemented | |
| ML19210D024 | 14 November 1979 | Updated LER 78-077/03L-1:on 781011,inner Stage Relief Valve on B Air Compressor Lifted & Stuck Open.Caused by Dessicant from Air Dryers.B Air Compressor Replaced,Dessicant Removed & Compressors Blown Out.Check Valves Installed | |
| ML19210E349 | 29 November 1979 | LER 79-053/03L-0:on 791101,rod K-14 in Control Bank a Declared Inoperable Due to Failure to Move in or Out During Manual Bank Movement.Caused by Open Control Rod Drive Mechanism Cable Making Power Unavailable to K-14 Lift Coil | |
| ML19224C950 | 6 July 1979 | LER 79-023/01T-0 on 790622:notified by Westinghouse That High Energy Line Break Inside Containment Could Cause Heatup of Steam Generator Level Transmitter Ref Legs. LER Will Be Issued Upon Completion of Investigation | |
| ML19224D343 | 14 July 1978 | LER 78-043/03L-0 on 780624:FNP-O-STP-12.0 Had Not Been Performed Between 780611-24.Caused by Incorrect Scheduling. Personnel Notified & Surveillance Schedule Reviewed | |
| ML19224D800 | 9 July 1979 | LER 79-025/03L-0 on 790623:during Surveillance Test FNP-1-STP-256.11 Both Source Range Channels Inadvertently Were Deenergized. Caused by Procedure Deficiency. Power Restored & Procedure Changed | |
| ML19224D810 | 9 July 1979 | LER 78-088/03L-1 on 791125:train a River Water Pumps Found Tripped & Could Not Be Restarted from Control Room.Caused by Moisture in Switch Box.Condulet Sealing Fittings Installed on Switch Box to Prevent Water Accumulation.Design Changed | |
| ML19225B258 | 19 July 1979 | LER 79-022/03L-0 on 790620:surveillance Test Procedure FNP-1-STP-29.2 Not Performed on 790620.Caused by Inadequate Surveillance Test Schedule Review by Shift Foreman on 790620.Importance of Accurate Daily Review Stressed | |
| ML19225B261 | 19 July 1979 | LER 79-024/03L-0 on 790622:during Review of Surveillance Tests FNP-1-STP-40.1 & 40.2,noted That Certain Components Were Not Included in Test Procedures.Caused by Procedural Deficiencies.Procedure Change Has Been Made | |
| ML19225B262 | 19 July 1979 | LER 79-027/03L-0 on 790607:radiation Monitor Declared Inoperable.Caused by Pump Malfunction.Pump Repaired & Declared Operable 790615 | |
| ML19241A949 | 26 September 1978 | LER 78-059/03L-0 on 780830:during Rapid Load Reduction from 100% Power,Tavg Exceeded Tech Spec Limits.Caused by Attempt to Maintain Axial Flux Differential within Target Band. Control Rods Driven in | |
| ML19241A953 | 26 September 1978 | LER 78-060/03L-0 on 780827:diesel Generator 2c Would Not Respond to Governor Motor Switch or Voltage Regulator Switch.Caused by Instrument Noise & Failure of Motor Pot.Pot & Fuses Replaced | |
| ML19242A387 | 26 July 1979 | LER 79-026/03L-0 on 790716:total of 135 Hydraulic Snubbers Did Not Meet Surveillance Test Requirements.Caused by Loss of Oil Due to Seal Leakage & Failure to Meet Lockup & Bleed Acceptance Criteria.Snubbers Repaired & Tested | |
| ML19242A391 | 26 July 1979 | LER 79-028/03L-0 on 790627:radiation Monitor R-5 Declared Inoperable Due to Loss of Power.Feedbreaker Found Open. Cause Unknown.Breaker Closed & R-5 Declared Operable | |
| ML19242B088 | 3 August 1979 | LER 79-031/03L-0 on 790717:two Control Power Fuses Blew in N31 Source Range Drawer & Were Causing Loss of Power in Both Source Range Channels.Caused by Personnel Error | |
| ML19242D193 | 9 August 1979 | LER 79-029/03L-0 on 790713:penetration Room Filtration Sys Trains a & B Inoperable.Caused by Train B Exhaust Fan Not Starting & Train a Suction Damper Not Opening.Overload Reset & Fuse Replaced | |
| ML19242D246 | 8 August 1979 | LER 78-024/03L-1 on 780408:while Changing Turbine Governor Valve Control,Load Rejection of Approx 170 MW Resulted in Momentary Temp Average Increase.Control Rods Automatically Initiated & Average Reduced | |
| ML19249B389 | 28 August 1979 | LER 79-032/03L-0:on 790730,determined That Diesel Generators 1C & 2C Output Breakers Were Racked Out.Caused by Personnel Error.Breakers Racked in & Control Power Restored | |
| ML19249B395 | 28 August 1979 | LER 79-033/03L-0:on 790803,radiation Monitor R25B Declared Inoperable.Caused by Drive Belt Failure.New Drive Belt Installed | |
| ML19250A458 | 19 October 1979 | LER 79-040/01T-0:on 791011,wrong Valves Installed in Piping Sys.Caused by Deficiency in Original Plant Design Equipment Specs.Valves Being Replaced | |
| ML19250C326 | 20 November 1979 | LER 79-043/01T-0:on 791107,level in Fire Protection Water Tanks a & B Fell to 79,000 Gallons.Caused by Fire in Cooling Tower.Second Well Water Pump Placed in Svc.Fire Extinguished & Tech Specs 3.7.11.1 Met | |
| ML19250C328 | 20 November 1979 | LER 79-044/01T-0:on 791107,Westinghouse Notified Util That Potential Exists for P-4 Failures Not Being Identified During Tests.Caused by Automatic Self Test Circuits Not Checking P-4 Contacts | |
| ML19250C371 | 20 November 1979 | LER 79-041/03L-0:on 791024,river Water Train B Pumps Declared Inoperable.Caused by Moisture Accumulation in Level Switch LS-510.Level Switch Replaced & Resealed | |
| ML19250C374 | 20 November 1979 | LER 79-042/03L-0:on 791027,containment Air Lock Personnel Access Hatch Declared Inoperable.Caused by Leaking Exterior Door Seal.Seal Replaced & Procedure FNP-0-STP-15.0 Performed | |
| ML19250C376 | 20 November 1979 | LER 79-045/03L-0:on 791023,chlorine Detector B in Control Room Heating,Ventilation & Air Conditioning Declared Inoperable.Caused by Open Links in Balance of Plant Panel | |
| ML19250C378 | 20 November 1979 | LER 79-046/03L-0:on 791103,condensate Storage Tank (CST) Level Fell 5,000 Gallons Below Tech Specs.Caused by Failure to Terminate Flushing Condensate Sys.Cst Filled to Above Tech Specs & Personnel Reinstructed on Monitoring CST | |
| ML19250C379 | 20 November 1979 | LER 79-047/03L-0:on 791025,containment Air Lock Declared Inoperable.Caused by Misaligned Interlock Mechanism. Interlock Set Screws Tightened & Bearings Replaced | |
| ML19250C381 | 20 November 1979 | LER 79-048/03L-0:on 791027,containment Emergency Access Hatch Door Declared Inoperable.Caused by Misalignment of Door Latch.Use of Emergency Access Terminated While Latch Reset | |
| ML19253A850 | 6 September 1979 | LER 79-034/03L-0:on 790824,determined That Functional Surveillance Test Had Not Been Performed on Certain Seismic Monitoring Instrumentation within Specified Time.Caused by Personnel Error.Proper Procedure re-emphasized | |
| ML19253C956 | 7 December 1979 | LER 79-055/03L-0:on 791108,borated Water Vol in Boric Acid Storage Tank Fell Below Tech Spec Limit Due to Reactor Cooldown.Boric Acid Tank Concentration Was Returned to Less than 7,700 Ppm,By 771109 | Boric Acid Shutdown Margin |
| ML19253C978 | 7 December 1979 | LER 79-056/03L-0:on 791108,20 Dysfunctional Fire Barrier Penetrations Found During QA Audit.Caused by Misinterpretation of Tech Specs by Plant Personnel. Inoperable Penetrations Repaired | Fire Barrier |
| ML19254E989 | 29 October 1979 | Updated LER 79-017/01T-3:on 790330,safety Analysis Methology Review for Single Dropped Rod Indicated Potential for Inconsistent DNB Ratios.Caused by Incorrect Measurement of Core Power Level | Rod Drop Event |
| ML19256A829 | 11 January 1979 | LER 78-091/03L-0 on 781212:train a River Water Pumps Noted to Be in Tripped State,Could Not Be Started from Control Room.Cause Not Yet Determined | |
| ML19256G016 | 19 December 1979 | LER 79-057/03L-0:on 791122,steam Generator B Level Channel 486 Declared Inoperable Due to High Reading.Caused by Instruments Equalizing Valve Leaking.Valve Tightened,Tested & Returned to Operation | |
| ML19256G018 | 19 December 1979 | LER 79-058/03L-0:on 791121,boron Injection Tank Declared Inoperable Due to Low Concentration.Caused by Inadvertent Safety Injection.Concentration Increased by Batching | |
| ML19256G547 | 28 December 1979 | LER 79-060/03L-0:on 791202,while Moving from Mode 1 to 2, Containment Pressure Hi-1 & Hi-2 Trip Status Lights for One Channel Energized on Mcb W/Normal Readings on Containment Pressure Indicators.Caused by Comparator Card Failure | |
| ML19257A739 | 31 December 1979 | LER 79-059/03L-0:on 791130,flow Path from Boric Acid Tank B Inoperable Due to Closed Outlet Valve.Caused by Operator Error.Valve Opened & Personnel Involved Received Training for Correct Procedure | Boric Acid |
| ML19257A900 | 4 January 1980 | LER 79-063/03L-0:on 791204,flow Path from Bat a Was Inoperable Due to Outlet Valve Being Closed.Caused by Operator Error & Procedural Deficiencies.Valve Opened & Sys Returned to Operation | |
| ML19257A912 | 2 January 1980 | LER 79-061/03L-0:on 791202,while Making Change from Mode 1 to 2 & Securing Secondary Steam Loads,Atmospheric Relief Valve C Failed Open,Causing Reduction in RCS Average Temp to 531 F.Caused by Broken Positioning Arm.Valve Isolated | |
| ML19257A914 | 2 January 1980 | LER 79-062/03L-0:on 791204,during Turbine Load Reduction Due to Failed DEH Voltage/Frequency Converter,Indicated Axial Flux Difference Was Not Maintained within Tech Spec Band. Caused by Failed DEH Voltage to Frequency Converter | |
| ML19257D468 | 25 January 1980 | LER 79-068/03L-0:on 791226,charging Pump 1C Removed from Operable Status to Perform Maint.On 791227,inadequacies Seen in Alignment of Charging Pumps 1A & 1B.Caused by Personnel Error.Personnel Reinstructed in Procedures |