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ML17223A7469 February 1990LER 90-003-00:on 900110,determined That Recirculation Spray HX River Water Radiation Monitor Sample Lines Lacked Automatic,Remote Manual or Locked Shut Isolation Valve. Exemption Request from GDC 57 initiated.W/900209 LtrExemption Request
ML17285B47318 July 1990LER 90-007-00:on 900622,refueling Cavity Drain Flanges Found to Be Installed During Operation.Caused by Deficiency in Transfer Canal Draining Procedure.Procedure Revised to Verify Removal of Flanges After Canal drained.W/900717 Ltr
ML17286B26514 February 1991LER 90-006-01:on 900605,containment Isolation Valves Exceeded Stroke Time Limit,Per Tech Spec 3.6.3.1.Caused by Deficient Surveillance Program.Surveillance Procedures Revised to Include Stroke Time requirements.W/910214 LtrStroke time
ML18041A18814 March 1989LER 89-003-00:on 890212,noticed Erratic Operation of Main Feedwater Regulating Valve C & Turbine Trip/Reactor Trip Occurred Due to High Water Level in Steam Generator C.Caused by Valve Vibration & Hydraulic forces.W/890314 Ltr
ML18041A18921 April 1989LER 89-005-00:on 890322,safety Injection Occurred Due to Low Pressurizer Pressure.Caused by Deficiencies in Safety Accumulator Check Valve Surveillance Test.Refueling Outage Calibr Procedures pre-reviewed by operators.W/890421 Ltr
ML19207B13717 August 1979LER 79-019/01T-1 on 790723:as Result of Review of Safety Injection Sys Cable Used in Containment,Determined That Four Valves Require Wire Replacement Prior to Startup. Cable Will Be Replaced During Refueling
ML19207B13917 August 1979LER 79-024/01T-1 on 790727:as Result of Review of Solenoid Valves,Determined That 44 Valves Installed in Reactor Containment Have Deficiencies in Environ Qualifications. Caused by Inadequate Design.Valves Will Be Replaced
ML19207B45223 August 1979LER 79-023/03L-0 on 790724:during Surveillance Test,Diesel Generator 1 Output Breaker Failed to Close When Control Switch Was Actuated.Caused by Sticking Pinion on Air Motor. Pinion Assembly Cleaned,Exercised & Satisfactorily Tested
ML19207B45823 August 1979LER 79-025/03L-0 on 790624:during Records Review,Biasing Circuit for Channel 2 Temp Change Signal Summator Produced Output Signal Setpoint Approx 25 Degrees Too Low. Caused by Failure of Instrument Loop Signal Summator
ML19207B98531 August 1979LER 79-028/01T-0:on 790819,while Performing Manual Actions Following Reactor Trip,Operator Tripped Generator Output Breakers,Resulting in Underfrequency.Caused by Operator Error.Operator Reprimanded
ML19208A5278 September 1979LER 79-032/03L-0:on 790809,prior to Energizing 480-volt Stub Bus from Newly Installed Transformer,One Load Breaker Did Not Trip on Bus Undervoltage.Caused by Dirty Contacts on Phase Imbalance Relay.Contacts Cleaned & Tested
ML19208B47114 September 1979LER 79-029/03L-0:on 790816,high Temp Alarm Received for Charging Pump 1C Because River Water Supply Valve to Charging Pump Speed Increaser Was Left Shut.Caused by Failure of Personnel to Return Charging Pump to Svc
ML19208D50821 September 1979LER 79-030/03L-0:on 790823,containment Air Lock Surveillance Test Not Performed as Required.Caused by Failure of Operations Personnel to Perform Surveillance Test.Operating Supervisors Instructed to Be More Aware
ML19208D51121 September 1979LER 79-033/03L-0:on 790824,nuclear Instrumentation Sys Power Range Low Power Trip Logic Inoperable.Caused by Faulty Logic Board for Low Power Trip.Logic Board Replaced & Surveillance Test Completed Satisfactorily
ML19208D51321 September 1979LER 79-035/03L-0:on 790430,during 18-month Surveillance testing,23 Snubbers Had lock-up or Bleed Rate Values Outside of Acceptance Criteria.Caused by Air in Cylinder,Wear Ring Problems & Handling Damage.Snubbers Rebuilt
ML19209A30627 September 1979LER 79-026/03L-0:on 790827,channel 3 Overpower Delta Temp Alarm Was Received.Caused by Miscalibr of Instrument Loop as Result of Not Having Current Resistance Temp Detector Calibr Data in Surveillance Test.Maint Procedures Will Be Revised
ML19209C68310 October 1979LER 79-036/03L-0:on 790910,during Surveillance Testing, Loophandling Sys Infection Pump 1A Did Not Develop Required Recirculation Flow.Caused by Introduction of Fire Hose Nozzle Into Pump Line.Piping Will Be Inspected
ML19210D02113 November 1979LER 79-042/03L-0:on 791013,RCS Loop a Feedwater Flow Channel 3 Indication Observed Spiking Downscale.Caused by Loose Printed Circuit Card in Instrument Loop.Card Strapped to Position & Loop Returned to Svc
ML19210D13315 November 1979LER 79-043/03L-0:on 790301,during Period Mar-Sept 1979, Analysis of Diesel Fuel Not Completed within Specified Time. Caused by Incomplete Instructions for Modes 5 & 6.Chemistry Manual Revised to Clarify Sampling
ML19210D58921 November 1979LER 79-047/01T-0:on 791110,discovered Air Leak Into Containment.Caused by Inadequate Procedures for Monitor Access Cover Replacement.Procedures Will Be Revised & Affected Personnel Will Review RevisionGrab sample
ML19211C5464 January 1980LER 80-001/01T-0:on 790803, Rept on Seismic Reanalysis of Safety-Related Piping Sys,Rev Erroneously Stated No Piping Sys of Six Inches or Under Was Analyzed Using SHOCK-II.Nine Problems Actually Analyzed w/SHOCK-II
ML19225A0098 July 1979LER 79-016/03L-0 on 790608:cables Discovered Incorrectly Routed.Caused by Personnel Error During Const.Cables Will Be Rerouted & Verified Correct.Investigation Underway to Check Other Cables
ML19225A0128 July 1979LER 79-017/03L-0 on 790609:during insp,1B Lhsi Pump Suction Valve from Refueling Water Storage Tank Found Inoperable. Caused by Failure of Motor Operator Torque Switch.Switch Assembly Replaced,Tested & Returned to Svc
ML19241A6682 July 1979LER 79-014/01T-0 on 790618:special Radiographic Insp of Three Steam Generator nozzle-to-feedwater Piping Welds Showed Cracking in Three Inlet Elbows.Caused by Fatigue Failure Assisted by Corrosion.Elbows Replaced
ML19242C4653 August 1979LER 79-018/03L-0 on 790703:while Switching Vital Bus 3 to Alternate Source Containment Isolation,Phase B Actuation Occurred.Caused by Hi-Hi Containment Pressure.Revised Procedure for Transferring Vital Bus
ML19242D2657 August 1979LER 79-020/01T-0 on 790724:during Insp,Inoperable Pipe Hanger Baseplate Observed.Caused by Improper Installation of Concrete Expansion Anchors in Baseplate Due to Lack of Formal Procedures During Initial Installation
ML19242D3569 August 1979LER 79-021/01T on 790726:meggar Readings Indicated Degradation of Insulation Resistance During Testing of Emergency Bus GE Transformers.Cause Not Stated. Transformers Replaced W/Qualified Ite Transformers
ML19247A62424 July 1979LER 79-019/01T-0 on 790723:two of Four Vendors of Wire Used in Safety Injection Sys Cannot Document Quality of Wire for post-DBA Containment Environ.Wire Will Be Replaced on Four Valves During Refueling
ML19247C9722 August 1979LER 79-016/03L-1 on 790608:discovered Cables on Pump Header Isolation Valves Incorrectly Routed Through Cable Trays. Caused by Failure of Const Personnel to Install & Verify Cable Routings Per Procedure.Routing Corrected
ML19248D2081 August 1979LER 78-053/01T-1 on 781026:during Review of Steam Injection Piping Stress Calculations,Error in Original Piping Stress Analysis for One Steam Injection Was Discovered.Caused by Use of Unacceptable Computer Program.Mods to Be Installed
ML19248D2091 August 1979LER 79-008/01T-1 on 790329:notifies of Potential Inconsistency of Single Dropped Control Rod.Caused by Incorrect Measurement of Core Average Power Level by Rod Controller During Rod Drop EventsRod Drop Event
ML19248D2171 August 1979LER 79-010/01T-1 on 790416:notifies of Potential for Failure of Inside Recirculation Spray Pump Motors.Caused by Reduction of Internal Clearance Due to Heat Gradient as Motor Comes Up to Operating Temp.Mods Made to Clearance
ML19248D2211 August 1979LER 79-014/01T-1 on 790618:during Special Radiographic Insp of Feedwater Inlet Piping Welds,Cracking Was Discovered in Inlet Elbows.Caused by Fatigue Failure Along W/Corrosion. Insp Completed & Welds Repaired
ML19248D2241 August 1979LER 79-015/01T-1 on 790621:notifies That High Energy Line Break Inside Containment Could Result in Potential Steam Generator Level Bias.Caused by Heatup of Steam Generator Level Measurement Ref Leg.Tech Spec Change Submitted
ML19248D2261 August 1979LER 79-024/01T-0 on 790727:as Result of Review of Asco Solenoid Valves Per IE Bulletin 79-01A,44 Valves Found W/Deficiencies in Environ Qualifications.Caused by Inadequate Design
ML19249A52117 August 1979LER 79-022/03L-0 on 790722:three of Four Wires Loose & Pulled Out of Main Power Connector on Containment Hydrogen Recombiner 1A While Disassembling for Insp.Caused by Insufficient Set Screw Torque on Wires in Pins of Connector
ML19249D82618 September 1979LER 79-034/03L-0:on 790424,loop B Temp Indication Failed Downscale.Caused by Failure of Capacitor in Low Level Amplifier TM-RC-422H for Loop B Hot Leg Temp.Redundant Instrumentation Used Until Capacitor Replaced
ML19250A47418 October 1979LER 79-038/03L-0:on 790918,vital Bus Inverter 4 Output Frequency Observed Spiking Upscale.Caused by Faulty Oscillator Card in Inverter Control Logic.Inverter Repaired & Returned to Svc
ML19250C33716 November 1979LER 79-044/03L-0:on 791018,air Storage Tank D of Control Room Emergency Pressurization Sys Discovered Below Allowable Limits.Caused by Failed Compressor.Compressor to Be Overhauled
ML19250C35116 November 1979LER 79-049/01T-0:on 791104,containment Atmosphere Samples Not Taken While Particulate Monitor Out of Svc.Caused by Personnel Error.Clarifying Ltr Will Be Sent to Personnel & Radcon Log Amended to Show Action Required
ML19253B0177 September 1979LER 79-031/03L-0:on 790807,during Testing of Emergency Diesel Generator Sequencing Circuit,First Loading Sequence Was Shorter than Required.Caused by Starting Point Being Off Zero.Sequencer Cycled & Adjusted to within Spec Limits
ML19254D34619 October 1979LER 79-037/03L-0:on 790921,during Surveillance Test of Battery 1,cell 6 Indicated Voltage Decrease of More than 0.05 Volts from Value of Original Acceptance Test.Cause Not Stated.Cell 6 Replaced
ML19254F5001 November 1979LER 79-041/03L-0:on 791004,after Control Rod Bank D Was Withdrawn Several Steps,Analog Rod Position Indicators Demonstrated All Rods within +/- 5 Steps of Each Other. Caused by Instrument Drift.Indicators Recalibr
ML19256A81810 January 1979LER 78-067/01T-0 on 781220:during Containment Type a Leak Test,Excessive Leakage Was Found at Containment Air Ejector Penetration Isolation Valves,Caused by Warped Rubber Valve Seats
ML19259A71629 December 1978LER 79-002/03L-1 on 780102:Vital Bus 4 Transferred to Auxiliary Supply But Supply Breaker Tripped Which de-energized No 4 Inverter Resulting in Reactor Trip & Safety Injection.Caused by Transfer of Vital Bus 4
ML19259B4322 February 1979LER 79-002/03L-0 on 790103:reactor Trip & Safety Injection Occurred.During recovery,1C Charging Pump Had Low Discharge Pressure Due to Faulty Rotating Element in Pump
ML19259B4332 February 1979LER 79-003/03L-0 on 790102:increasing Containment Air Partial Pressure observed.1B Containment Vacuum Pump Motor Running,But Pump Not Turning Due to Seized Rotor on Pump
ML19260C15611 December 1979LER 79-046/01T-0:on 791127,while Generator Which Provides Emergency Power to Motor Operated Valve CH-115D Was Removed from Svc,Valve Was Placed on Clearance in Closed Position for Maint.Caused by Operator Error
ML19262C24030 January 1980LER 80-002/01T-0:on 800117,during Operational Mode 5,w/RCS Temp at 100 F & Atmospheric Pressure & RCS Level mid-loop W/ RHR Flow at 1,700 Gpm,Reactor Vessel Vent Educator Was in Svc,Causing Negative Pressure
ML19263C32913 February 1979LER 77-105/03L-1 on 771011:during 18-month Surveillance testing,13 Hydraulic Snubbers Appeared to Have Suspect Lockup & Bleed Rate Valves.All Snubbers Have Been Rebuilt & Tested to New Generic Values
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