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 Issue dateTitleTopic
IR 05000315/19890059 June 1989Advises That Failure of Component Cooling Water Containment Isolation Valve 1-CCM-458 to Close Not Reportable Per 10CFR50.73.LER 50-315/89-05 Retracted & LER Number Will Not Be ReissuedTime of Discovery
ML17265A82324 May 1999LER 98-037-01:on 990422,determined That Ice Condenser Bypass Leakage Exceeds Design Basis Limit.Caused by Pressure Seal Required by Revised W Design Not Incorporated Into Aep Design.Numerous Matl Condition Walkdowns & Assessments MadeUnanalyzed Condition
ML17317A6513 October 1978LER#78-053/03L-0 on 780907:containment Atmosphere Gaseous & Particulate Monitoring Pump Discovered Inoperable.Failure Attributed to Obsolesence.Pump Replaced W/Improved Model W/ Longer Operational Expectancy
ML17317A65811 October 1978LER 78-069/03L-0:on 780913,while Performing Surveillance on Pressurizer Protection Sys,Reactor Trip Bistable Failed to Trip on Simulated High Pressure Signal.Bistable Replaced
ML17317A65911 October 1978LER 78-070/03L-0:on 780911,air Start Line on Diesel 2AB Found to Be Hot During Load Test.Caused by Loose Piston Bolt Letting Combustion Vapors in Air Starting Line.Check Valve Replaced & Engine Retested SatisfactorilyOffsite Circuit
ML17317A66918 October 1978LER 78-072/03L-0:on 780926,during Rapid Load Reduction from 100% to 20% Power,Pressurizer Pressure Reduced Below Tech Spec Limit.Caused by Rapid Power Reduction
ML17317A67018 October 1978LER 78-063/03L-1:on 780820,while Closing Turbine Valves at 99% Power,Steam Flow Reduced,Causing Reactor Coolant Temp to Increase & Power to Decrease.Caused by Testing Valves at Too High Power Level
ML17317A67820 October 1978LER#78-056/03L on 780923: After Shutdown Boron Concentration Was 1940 Ppm,Which Is Below Limit Due to Reduction of Boron Level After Sampling at 1% Accumulator Vol Increase.Admin Procedure Was Rev to Req Level & Boron Verification
ML17317A68820 October 1978LER 78-074/03L-0:on 780921,bistables Returned to Normal from Trip Position W/O Dynamics of lead-lag Portion of Unit Being Calibr.Caused by Improper Communications
ML17317A7151 November 1978LER#78-076/03L-0 on 781003:surveillance Tests on train-B of Solid St Protec Sys Showed That Several Switch Positions Were Bad.Caused by Bad Universal Logic Card.Card Replaced & Sys Returned to Svc
ML17317A7161 November 1978LER#78-077/03L-0 on 781005:main Turbine Stop Valves C & D Closure Limit Switches Found Inoperable.Caused by Excessive Vibration of Stop Valves Due to Poor Design
ML17317A7338 November 1978LER#78-034/03X-2 on 780515:hydrogen Skimmer Recirculation Fans Starting Times Were Found to Be 10 minutes,6 Seconds for 2HV-CEQ2 & 10 minutes,5 Seconds for 2-HV-CEQ1.One Minute TS Tolerance for Unit 2 & Agastats Are of 0-60 Minute Range
ML17317A7348 November 1978LER 78-034/03l-0:on 781010,manual Isolation Valve in Flow Test Circuit of Turbine Driven Aux Feed Pump Found Unlocked & Open.Instructions Issued to Keep a Manual Valve in Test Line Closed & Locked Except When Testing
ML17317A7358 November 1978LER 78-079/03L-0:on 781019,engine Failed to Start While Attempting to Prove Operability of 2AB Emergency Diesel in Order to Remove 2CD Diesel from Svc.Cause for Apparent Lack of Fuel Could Not Be Determined
ML17317A74015 November 1978LER#78-060/03L-0 on 781028:RCS Leak Discovered Due to Excessive Packing on a 314 Valve in Pzr Safety Valve Loop Seal Drain Line.Valve Found to Be 1/8 Turn Open.Valve Closed and Leakage StoppedLoop seal
ML17317A76522 November 1978LER#78-080/03L-0 on 781024:during Test of Solid St Protec Sys,Train A,3 Logic Test Positions Tested Unsatisfactorily. Caused by Failure of a Universal Logic Card & a Test Card. Both Subsequently Replaced
ML17317A76622 November 1978LER#78-081/03L-0 on 781023:boron Injection Tank Boron Concentration Found to Exceed Tech Spec Limit.Caused by Either Lack of Effective Mixing from a Previous Boric Acid Solution Addition or by Faulty Sampling MethodsBoric Acid
ML17317A76722 November 1978LER#78-082/03L-0 on 781025:during Leak Rate Test on the 650 Foot Elevation Airlock Doors,Noted That Leakage Rate Exceeded Acceptable Limits.Caused by Inadequate Seal of Outer Door.Switch Indicator Subsequently Readjusted
ML17317A76822 November 1978LER#78-083/03L-0 on 781023:noted That Cycling Times for Valve Operability Test After Maintenance Not Recorded When Valves Stroked.Caused by Defective Document Control for Issuing Changes to Instructions
ML17317A7771 December 1978LER#78-085/03L-0 on 781106:during Routine Surveillance Test Turbine Driven Auxiliary Feedwater Pump Did Not Start.Caused by Zener Diode Which Had Shorted at Electronic Overspeed Monitor,Resulting in Constant Overspeed Trip Signal
ML17317A7821 December 1978LER#78-061/03L-0 on 780823:discovered That During Past Surveillance Testing,Allowable Surveillance Extension Had Been Exceeded for Target Flux Difference Surveillance Test. Caused by Personnel Error
ML17317A7844 December 1978LER#78-086/03L-0 on 780723:snubber#63 Was Found to Be Inverted on Its Horizontal Axis During Inspec Due to Loose Rod End Locknut.Snubber Removed,Tested & Reinstalled
ML17317A7876 December 1978LER#78-087/03L-0 on 781110:Containment Integrity Was Broken by Disassembling an NESW Check Valve While Reactor Plant Was in Mode 3.Early Start of Repair Has Been Reviewed by Personnel to Prevent Future Mistake
ML17317A7917 December 1978LER 78-062/03L-0:on 781107,Unit 1 AB Diesel Declared Inoperable Following Inadvertent Removal of Circuit Board Card from Diesel Voltage Regulator Circuitry.Removal Caused by Technician Snagging the Board on Clothing
ML17317A7947 December 1978LER#78-089/03L-0 on 781109:emergency Load Reduction Resulted in Axial Flux Difference Outside Target Band.Caused by Loss of All Generator Bus Duct Cooling
ML17317A80312 December 1978LER#78-090/01T-0 on 781121:w/RHR in Oper,Leakage Was Noted from Some Upper Containment Spray Nozzles,Caused by Check Valves CTS-127E & CTS-127W Being Installed Backwards
ML17317A82120 December 1978LER#78-063/03L-0 on 781128:aux Feed Throttle from Mdafp to #3S/G Position Indication Was Intermittent;Valve Would Not Close Electrically.Caused by Broken Lead Between Terminal #43 & #57 on Aux Switch of Limitorque SMB-0-25 Operator
ML17317A82420 December 1978LER#78-091/03L-0 on 781125:source Range Neutron Flux Channel N-31 Inoperable.Caused by Unclean Connectors on High Voltage Cable & Signal Cable at Prcamp
ML17317A82520 December 1978LER#78-092/03L-0 on 781125:reactor Coolant Average Temp on 2 of 4 Loops Below Tech Specs of 541F,resulting in P-12 Permissive Being Actuated.Caused by Turbine Test W/Minimum Steam Dump,Increase Steam Flow Caused Temp Drop
ML17317A82620 December 1978LER#78-093/03L-0 on 781125:rod Position Indication(Rpi)For Control Rod H-8 Exceeded 12 Step Limit.Caused by H-8 Drift
ML17317A82720 December 1978LER#78-094/03L-0 on 781202:halon Sys for Cable Spreading Area Was Discharged & Therefore Inoperable.Caused by Operator Error
ML17317A82820 December 1978LER#78-095/03L-0 on 781206:while Decreasing Turbine Load, Reactor Coolant Average Temp Exceeded 576.2 F.Caused by Faulty Drain Valves on 5-A Heater,Creating Unstable Feedwater Control & Turbine Load
ML17317A82920 December 1978LER#78-096/03L-0 on 781209:during Rapid Load Reduction from 100% to 88%,axial Flux Difference Went Outside Target Band. Air Leak on a Condenser Vacuum Breaker Caused Increase in Back Pressure on Main Condenser
ML17317A83020 December 1978LER#78-097/03L-0 on 781209:during Rapid Pwr Reduction from 100% to 88%,pwr Pressurizer Pressure Reduced Below Tech Spec Limit of 2220psia.Caused by Rapid Pwr Reduction Because of Decreasing Vacuum on Main Turbine/Generator
ML17317A83120 December 1978LER#78-098/03L-0 on 781010:axial Flux Difference(Afd) Monitoring Alarm Point Was Discovered to Be Set at 103% Vice 84%.Caused by Afd Alarm Trip Point Being Raised for Testing Purposes & Not Returned to Correct Point
ML17317A84628 December 1978LER 78-099/03L-0 on 781212:pressurizer Pressure Was Reduced to 2215 Psia,Caused by Trip of Circuit Breaker Controlling Instrument Air to Containment.Loss of Air Closed Letdown Valves,Left No Air to Open Spray Valves
ML17317A86129 December 1978LER 78-100/01T-0 on 781217:containment APD(R-11)ran Out of Filter Paper & Caused High Flow Condition.Sample Pump Tripped,Rendered Containment Gaseous Monitoring Sys Inoperable.Caused by Need for Filter Paper in Sample Pump
ML17317A8645 January 1979LER 78-101/01T-0 on 781223:both Control Room Pressurization Fans Were Inoperable.Caused by Water Seepage Into a Fire Protection Sys Switch,Resulting in Actuation of Fire Spray Sys & Lockout of the FansBoric Acid
Safe Shutdown Earthquake
Coatings
Nondestructive Examination
Overtravel
Inattentive
ML17317A8709 January 1979LER 78-064/03L-0 on 781214:during Surveillance Noted That Position of Rod M-8 Was Greater than Allowable 12 Step Limit.Caused by Maladjustment of Variable Shunt Resistor Contained in Control Board Indicator for Rod M-8
ML17317A88116 January 1979LER 78-023/03X-1 on 780312:during Containment Air Lock Leakage Test on 650 Foot Elevation Inner Door,Door Seal Leakage Rate Exceeded Tech Spec Limit,Caused by Paint Chips on Rubber Seal Which Obstructed Proper Seal on Door
ML17317A88416 January 1979LER 78-038/03X-1 on 780623:while in Mode 2,position of Rods C-3,C-13,N-13,H-6,F-8 & K-8 Indicated Deviation of Greater than 12 Steps from Demand Position.Caused by Signal Conditioning Modules
ML17317A88616 January 1979LER 78-042/03X-1 on 780710:during Startup Testing,Flux Map Measurement Was Not Processed During Specified Time Limit. Though Flux Map Was Obtained,It Was Not Processed Due to Change in Manpower Requirements
ML17317A88716 January 1979LER 78-065/03L-0 on 781229:indication for Pressurizer Level Channel 2 Deviated Approx 5% from Other 2 Channels.Caused by Gas Pocket in Sensing Line
ML17317A88816 January 1979LER 78-066/03L-0 on 781229:during Routine Startup,Rod Position Indication for Rods F-4,D-6 & K-6 Exceeded 12 Step Limit of Tech Specs.Caused by Drift of Signal Conditioning Modules
ML17317A89919 January 1979LER 78-022/03X-1 on 780407:during Normal Operation,Position Indication for Rods D-12 & H-8 Exceeded +/- 12 Step Limit of Tech Specs.Outputs of Amplifiers That Feed Control Board Indicators Found to Be Incorrect
ML17317A90119 January 1979LER 78-031/03X-1 on 780507:during Normal Operation Between 780507 & 780519 RPI Did Not Meet +/- 12 Step Limit of Tech Specs 22 Times.Caused by Recessed Pins in Connector
ML17317A90419 January 1979LER 78-067/03L-0 on 781223:during Routine Surveillance Test on Solid State Protection Sys,Several Logic Functions in Train B Tested Unsatisfactorily.Test Card(Model 6056033G01) Had Failed & Was Replaced
ML17317A90519 January 1979LER 78-068/03L-0 on 781221:during Rapid Power Reduction from 100% to 74% Axial Flux Difference Was Forced Outside Target Band Specified by Tech Specs.Inadvertent Feed Pump Turbine Trip Necessitated Load Reduction to Prevent Trip
ML17317A91331 January 1979LER 79-001/03L-0 on 790111:at 100% Power,Quadrant Power Tilt Ratio Alarm Per Tech Spec 4.2.4 Was in Error.Calculation of Tilt Ratio Is Required Every 12-h;first Survey Was Missed Because Alarm Instruments Were Being Calibr
ML17317A9255 February 1979LER 79-002/03L-0 on 790106:during Startup,Auxiliary Feedwater Motor Operated Valve Would Not Close Due to Broken Wire in SMB-0-25 Operator.Caused by Vibration & Use of Solid Conductor
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