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	Issue date	Title	Topic
ML17352B258	25 March 1994	LER 94-007-00:on 940224,station Procedure for Testing Reactor Trip Bypass Breakers Did Not Satisfy Ts.Caused by Inadequate Procedure Preparation & Review.Surveillance Procedure Enhancement Program underway.W/940325 Ltr
ML19324B137	23 October 1989	LER 89-023-00:on 890922,turbine Trip Occurred on Loss of Power to Four Main Turbine Auto Stop Solenoids.Caused by Failure of Capacitor on Dc to Dc Converter Board in nonsafety-related Inverter.Inverter repaired.W/891023 Ltr
ML19324C161	10 November 1989	LER 89-020-00:on 891011,inverter Which Feeds Channel IV Class IE Vital Ac Distribution Panel Failed Causing ESF Actuations in Control Room.Caused by Failure of Bridge Rectifier Circuit.Inverter repaired.W/891110 Ltr
ML19325C308	5 October 1989	LER 89-021-00:on 890905,reactor Trip & Auxiliary Feedwater Sys Actuation Occurred.Caused by Defective Pump 22 Speed Controller Card Edge Connector.Defective Card Edge Connector Repaired & Card Frame Alignment checked.W/891005 Ltr
ML19325E244	26 October 1989	LER 89-018-00:on 890922,determined That Const Installation Procedure for Reg Guide 1.97 Category 2 Instrumentation Did Not Include Installation Details.Caused by Improper Design Coordination.Procedure No Longer in use.W/891026 Ltr	Safe Shutdown
ML19325E570	30 October 1989	LER 89-024-00:on 890528,essential Chiller Not Restored to Svc within 72 H Time Limit Specified in Tech Spec.Caused by Incorrect Decision by Mgt Personnel.Operations Personnel Briefed Re Event & Procedure revs.W/891030 Ltr
ML19325E582	30 October 1989	LER 89-019-00:on 890927 & 28,reactor Containment Bldg Atmosphere Grab Samples Not Taken at Least Once Per 24 H as Required by Tech Spec 3.3.3.Caused by No Programmatic Controls in Place.Night Orders issued.W/891030 Ltr	Grab sample
ML19327B215	19 October 1989	LER 89-022-00:on 890919,overtemp Delta Temp Turbine Runback Occurred,Resulting in Reactor Trip.Caused by Turbine Setpoint Design Intolerance of Small Temp Deviations.Runback Feature Disabled & Analysis performed.W/891019 Ltr
ML19327B542	24 October 1989	LER 89-017-00:on 890814,health Physics Personnel Detected Radiation Levels of .3 to .8 Mr/Hr in Auxiliary Steam Line to Liquid Waste Processing Sys Waste Evaporator.Caused by Inadequate Controls & Personnel error.W/891025 Ltr
ML19327C242	13 November 1989	LER 89-025-00:on 891006,channel in power-range Nuclear Instrumentation Improperly Calibr,Rendering Channel Inoperable.Caused by Inadequate Technician Training.Maint Qualification Program developed.W/891113 Ltr
ML19327C243	13 November 1989	LER 89-026-00:on 891013,reactor Trip Occurred Due to High Neutron Flux Negative Rate on Two of Four power-range Neutron Monitoring Channels.Caused by High Resistance Connection on Gripper Diode.Diode replaced.W/891113 Ltr
ML19332C067	16 November 1989	LER 89-021-00:on 891017,unplanned ESF Actuation of Control Room Ventilation Sys to Recirculation Mode Occurred.Cause Not Determined.Continued Surveillance Will Be Performed.W/ 891116 Ltr
ML19332C866	21 November 1989	LER 89-027-00:on 891025,discovered That Closed Limit Switch on Main Turbine Throttle Valve 2 Disconnected.Caused by Failure of Limit Switch Linkage.Review to Be Performed of Limit Switch Linkage design.W/891122 Ltr
ML19332D774	24 November 1989	LER 89-018-01:on 890922,discovered That Const Installation Procedure for Reg Guide 1.97,Rev 2 Instrumentation Did Not Include Details to Ensure Qualification Per 10CFR50.49 or IEEE 323-1974.Caused by Installation error.W/891124 Ltr	Safe Shutdown
ML20005E247	29 December 1989	LER 89-028-00:on 891130,control Room Ventilation Sys Actuated to Recirculation Mode as Result of Spurious Signal. Caused by Memory Error Causing Microprocessor to Energize Relay Incorrectly.Troubleshooting planned.W/891229 Ltr
ML20006B222	16 January 1990	LER 89-023-00:on 891216,standby Diesel Generator 11 Failed Tech Spec Required Operability Test & Attempt to Secure Essential Chiller 12C Resulted in Trip.Caused by Failure of Voltage Regulator.Regulator Returned to mfg.W/900116 Ltr
ML20006B255	19 January 1990	LER 89-022-00:on 891205,discovered That ASME Section XI Pressure Test of Train C of Component Cooling Water Sys Not Performed Prior to Returning Sys to Svc.Sys Inoperable from 890909-1206.Test Control Procedures revised.W/900119 Ltr
ML20006B473	25 January 1990	LER 89-024-00:on 891226,required Sample from Safety Injection Accumulator 1C of Boron Concentration Not Taken. Caused by Insufficient Administrative Controls to Track Surveillance Tests.Bulletin Will Be issued.W/900125 Ltr	Grab sample
ML20006D423	2 February 1990	LER 90-002-00:on 900103,redundant Solenoid Valve Which Actuates Train C Feedwater Valve Failed.Caused by Excessive Particulate Buildup.Solenoids Cleaned & Hydraulic Oil Flushed & Filtered to Remove particulate.W/900202 Ltr
ML20006D559	2 February 1990	LER 89-023-01:on 891216,standby Diesel Generator 11 Failed Tech Spec Required Operability Test & Declared Inoperable. Caused by Contact Oxidation & Low Contact Pressure.Chiller Auxiliary Relay Cleaned & adjusted.W/900202 Ltr
ML20006E378	16 February 1990	LER 90-001-00:on 900103,containment Ventilation Isolation Occurred Due to Loss of Power to Radiation Monitor Actuation Relay.Caused by Technician Lifting Power Lead. Technicians Trained & counseled.W/900216 Ltr
ML20006E400	12 February 1990	LER 90-001-00:on 900108,Train s Low Steam Line Pressure Blocking Switch Placed in Blocked Position,Causing Actuation of Safety Injection & ESF Sys.Caused by Lack of Instructions.Training Program modified.W/900212 Ltr
ML20012B438	1 March 1990	LER 90-002-00:on 900202,Train s Reactor Trip Breaker Opened, Initiating Turbine & Reactor Trip & Feedwater Isolation on Low Average RCS Temp.Cause Unknown.Universal Logic Cards Replaced & Monitoring Instruments installed.W/900301 Ltr
ML20012C721	16 March 1990	LER 90-003-00:on 900214,discovered That Train B Fuel Handling Bldg Exhaust Air Filter Outlet Damper Would Not Open.Caused by Wiring Error Due to Failure of Technicians to Follow Work Instructions.Technicians counseled.W/900316 Ltr
ML20024F745	12 December 1990	LER 90-017-00:on 901104,discovered That Train a of Class IE 120-volt Distribution Panel DP001 Energized from Alternate Power Supply.Caused by Less than Adequate Administrative Controls.Log Will Be utilized.W/901212 Ltr
ML20024H208	22 May 1991	LER 91-015-00:on 910422,train C AFW Pump Inadvertently Started Due to Failure of Led in Sequencer Test Circuitry. Faulty Led Replaced & Blocking Circuit Satisfactorily tested.W/910522 Ltr
ML20024H257	24 May 1991	LER 91-014-00:on 910420,erratic Containment Extended Range Pressure Channel Output Occurred.Caused by Bad Control Card. Weekly Channel Checks Performed,Control Card Replaced & Channel calibrated.W/910524 Ltr	Post Accident Monitoring
ML20029B042	25 February 1991	LER 91-002-00:on 910126,automatic Actuation of Safety Injection Sys Occurred in One of Three Train C Trains.Caused by Inadequate Work Instructions for Maint Activity.Training Bulletin Issued & Supervisors counseled.W/910225 Ltr
ML20029C122	15 March 1991	LER 91-004-00:on 910215,loss of Offsite Power Actuation Occurred During Routine Maint.Caused by Lack of Attention to Work Performance Methods.Training Conducted for Maintenance personnel.W/910315 Ltr
ML20029C695	18 April 1994	LER 94-011-00:on 940310,safety Injection Actuation Was Received on Trains A,B & C.Cause Was Failure to Adhere to Procedure.Corrective Actions:Restored Cooling Shutdown & Removed Personnel from watchbill.W/940418 Ltr	Time to boil
ML20029D632	2 May 1994	LER 94-002-01:on 940115,centrifugal Charging Pump 1A Discharge Bypass Valve Found in Open Position Contrary to Requirements of TS 3.1.2.3.Caused by hydro-pneumatic Transient.Valves Labeled W/Caution statements.W/940502 Ltr	Stroke time
ML20029D635	27 April 1994	LER 94-006-01:on 940214,reactor Manually Tripped Following Unanticipated Test Results.Caused by Mod Which Failed post- Mod Test.Test Terminated & Solid State Rod Control Sys Returned to Original Design configuration.W/940427 Ltr
ML20042E356	5 April 1990	LER 89-015-01:on 890704,reactor Trip Occurred.Caused by Failure of Relay in Generator Breaker Trip Circuit.Relays in Generator Breaker Trip Circuits Replaced W/Correct Models & Checked to Ensure Proper rating.W/900405 Ltr
ML20042F219	2 May 1990	LER 90-005-00:on 900329,feedwater Booster Pump 11 Tripped Upon Actuation of Ground Fault Relay & Standby Pump 13 Started But Did Not Deliver Sufficient Flow to Prevent Trip. Cause Not Found.Inlet Filters to Be cleaned.W/900502 Ltr
ML20043A781	15 May 1990	LER 90-005-00:on 900414,simultaneous Reactor & Turbine Trip Occurred Due to Failure of Main Turbine Electrohydraulic Control Line.Caused by Fatigue Stress of Weld.Valve Modified to Add anti-swirl Baffles & anti-rotation pins.W/900515 Ltr
ML20043B661	25 May 1990	LER 90-006-00:on 900426,control Room Ventilation Sys Actuated to Recirculation Mode Due to High Level Trip of Vinyl Acetate Channel on Gas Analyzer.Caused by Failure of electro-mechanical Positioner.Part replaced.W/900525 Ltr
ML20043C479	29 May 1990	LER 90-007-00:on 900426,standby Diesel Generator 22 Room High Sump Level Alarm Actuated in Control Room.Caused by Flooding & Inadequate Spec of Sealing & Testing Requirements.Seals on Removable Panels caulked.W/900529 Ltr	Internal Flooding
ML20043C740	30 May 1990	LER 90-007-00:on 900430,discovered That All Three Trains of ESFAS Placed in Test & Incapable of Actuating for Approx 35 Minutes.Caused by Inadequate Prerequisite Conditions in Maint Procedure.Procedure Being modified.W/900530 Ltr
ML20043E700	4 June 1990	LER 90-008-00:on 891007,Tech Spec Violation Occurred Due to Failure to Perform post-maint Testing.Caused by Incorrect Determination That No post-maint Testing Required.Personnel counseled.W/900604 Ltr
ML20043G179	13 June 1990	LER 90-009-00:on 900512,incorrect Wiring in Solid State Protection Sys Discovered.Caused by Inadvertent Installation of Extra Wire by Mfg.Extra Wire Removed & Sys Successfully tested.W/900613 Ltr
ML20043G209	14 June 1990	LER 90-010-00:on 900515,determined That Leak & Contamination Test Interval for Some Radioactive Sources Exceeded Tech Specs.Caused by Insufficient Detail in Procedures.Test Program revised.W/900614 Ltr	Grace period
ML20043G210	13 June 1990	LER 90-009-00:on 900514,discovered That Printer for Toxic Gas Analyzer XE-9325 Was Not Updating & Surveillances for Toxic Gas Monitor XE-9325 Incorrectly Performed on 900511. Caused by Inadequate training.W/900613 Ltr
ML20043G519	14 June 1990	LER 90-010-00:on 900515,unplanned Actuation of ESF Train C Standby Diesel Generator Occurred.Caused by Personnel Error. Training Bulletin Will Be Issued to Maint Personnel Re event.W/900613 Ltr
ML20043G768	8 June 1990	LER 90-008-00:on 900508,Tech Spec Required Shutdown Initiated Due to Primary Coolant Sys Leakage.Caused by High Cycle Fatigue Failure of Weld on Upstream Side of Drain Valve.Drain Valves replaced.W/900608 Ltr	Pressure boundary leak
ML20044B169	6 July 1990	LER 90-011-00:on 900612,chemical Technician Supervisor Discovered That No Sample Collected in Condenser Air Removal Sys Radiation Monitor Moisture Collection Tank. Caused by Inadequate procedure.W/900706 Ltr	Grab sample
ML20044E037	14 May 1993	LER 93-005-01:on 930214,control Room Operator Left CR Unmanned During Mode 4 Operation for 41 S.Caused by Inappropriate Action by Unit Supervisor.Event Will Be Included in Licensed Operator Requalification Training
ML20044F132	20 May 1993	LER 93-009-01:on 930217,TS 3.0.3 Entered Due to Potentially Undersized Fuses in Ssps.Caused by Random Age Related Failure of Ssps Fuse.Fuses in Selected Equipment Replaced During Fuse & Breaker Field Verification Effort	Unanalyzed Condition
ML20044F628	21 May 1993	LER 93-015-00:on 930423,plant Personnel Determined That May 1990 Control Room Makeup & Cleanup Filtration Sys Svc Time Exceeded.Caused by Failure to Develop Run H Tracking Method. Run Times for Cleanup & Makeup Fans monitored.W/930521 Ltr	Grace period
ML20044G430	25 May 1993	LER 93-009-00:on 930426,Tech Spec Violation Occurred Due to Use of Inappropriate Ref Value Data for RHR Pump Inservice Test.Surveillance Procedures Revised to Include Appropriate Ref values.W/930525 Ltr
ML20045A383	4 June 1993	LER 93-008-00:on 930505,heat Removal Motor Operated Valve Inoperable in Excess of Allowable Outage Time.Caused by Failure to Recognize Condition.Condition Corrected by Replacing T Drain

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