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| Issue date | Title | Topic | |
|---|---|---|---|
| ML20046B404 | 28 July 1993 | LER 93-004-00:on 930629,identified Noncompliance W/Srs of TS 4.3.2.1,Table 3.3-3.8.b.Caused by Personnel Error.Retest Sucessfully Performed & Personnel Involved Have Taken Part in Discussion of Importance of Review process.W/930728 Ltr | Missed surveillance |
| ML20046B160 | 28 July 1993 | LER 93-003-00:on 930628,TS Violation Occurred Due to Personnel Error Re non-licensed Operator Performing Evolution W/O Consulting Governing Procedure.Reactor Bldg Purge Supply Valves closed.W/930728 Ltr | |
| ML20028H441 | 27 December 1990 | LER 90-001-01:on 900209,Part 21 Rept Received from Gilbert Commonwealth Re Possible Loss of One Train of Chilled Water Sys in Event of High Energy Line Break.Conceptual Design Developed to Reduce Heat Load on coils.W/901231 Ltr | |
| ML20043F394 | 4 June 1990 | LER 90-008-00:on 900505,energizing of Sequencer Initiated Undervoltage Sequence Causing ESF Bus a to Deenergize. Caused by Incorrectly Installed Undervoltage Circuit Agastat Relay.Relay rewired.W/900604 Ltr | |
| ML20043B603 | 23 May 1990 | LER 90-007-00:on 900423,during Offsite Relay Testing,Oil Circuit Breaker Supplying Bus 3 Tripped Open,Resulting in Loss of Power to ESF Train B & Diesel Generator B Start. Caused by Deficient Procedure.Testing stopped.W/900523 Ltr | |
| ML20043A423 | 10 May 1990 | LER 90-006-00:on 900412,unplanned ESF Actuation Occurred When Train B Emergency Diesel Generator Automatically Started.Caused by Personnel Error.Feeder Breaker from Battery reopened.W/900510 Ltr | |
| ML20042G769 | 8 May 1990 | LER 90-005-00:on 900410,steam Generator Tube Eddy Current Exam Yielded Insp Category C-3 Results.Caused by Primary Water Stress Corrosion Cracking in Hot Leg Tubesheet Area. Defective Tubes Plugged or repaired.W/900508 Ltr | |
| ML20042G176 | 7 May 1990 | LER 90-003-00:on 900406,computer Software Error Caused Nonconservative Radiation Monitor Setpoints.Caused by Software Developer Personnel Error.Setpoints Readjusted & Procedures/Software evaluated.W/900507 Ltr | Grab sample |
| ML20042G179 | 7 May 1990 | LER 90-004-00:on 881114,investigation Determined That Two Leads for Cabinet XPN-6002 Had Been Previously Disconnected in 881114 Refueling Outage,Rendering Transmitter LT-1976 Inoperable.Caused by Personnel error.W/900507 Ltr | Post Accident Monitoring |
| ML20042E160 | 11 April 1990 | LER 90-002-00:on 900318,inadvertent ESF Actuation Occurred When Emergency Start Signal Reset.Caused by Procedure Inadequacy When Emergency Start Signal Still Present on Train B.Sys Operating Procedure revised.W/900411 Ltr | |
| ML20012C423 | 12 March 1990 | LER 90-001-00:on 900209,Gilbert/Commonwealth,Inc Informed Util of Vendor Requirement to Rept Design Deficiency Re Failure of Safety Function,Per Part 21.Util Evaluating What Design Mods Can Be Made to Correct deficiency.W/900312 Ltr | |
| ML20006B123 | 26 January 1990 | LER 89-022-00:on 890913,discovered That Chilled Water Pump B Returned to Svc W/O Performing Adequate Section XI of ASME Boiler & Pressure Vessel Code Required post-maint Operability Test.Caused by Personnel error.W/900126 Ltr | |
| ML19354E164 | 17 January 1990 | LER 89-021-00:on 891218,when Operator Directed to Stop Svc Water Pump C by Positioning Handswitch to auto-after Stop Position,Pump Started,Causing ESF Actuation.Caused by Failed Circuit Board.Board replaced.W/900117 Ltr | |
| ML20005G151 | 8 January 1990 | LER 88-008-01:on 880607,AE (Gilbert Assoc) Notified Util of Design Defect Yielding Potential for Steam Propagation Path Which Could Affect Safe Shutdown Equipment.Caused by Design Error.Also Reportable Per Part 21.W/900108 Ltr | Safe Shutdown |
| ML20005E694 | 2 January 1990 | LER 89-019-00:on 891203,as Result of Plant Trip on 891202, Results of Reactor Coolant Sample Not Reviewed & Recognized as Being Out of Tolerance.Caused by Personnel Error.Another Sample of RCS Taken & Analyzed,Per Tech Spec.W/900102 Ltr | Missed surveillance |
| ML20005E661 | 2 January 1990 | LER 89-020-00:on 891202,turbine Controls Failed to Respond to Attempt to Counter Loss of Load & Turbine Manually Tripped.Caused by Relay Contact Failure in Turbine Electrohydraulic Control circuitry.W/900102 Ltr | |
| ML20011D469 | 20 December 1989 | LER 89-015-02:on 890825,presssurizer Safety Valve Body Inlet Temp Increased to Greater than 450 F & Acoustic Leak Monitor Alarmed,Causing RCS to Depressurize & Reactor Trip. Caused by Loss of Loop Seal.Valve replaced.W/891220 Ltr | Loop seal |
| ML19332F013 | 30 November 1989 | LER 89-018-00:on 891027,shift Engineer Observed That Control Room Alarm Did Not Occur When Sample Pumps Stopped.On 891031,radiation Monitors RM-A3 & RM-A4 Declared Inoperable. Caused by Inadequate procedures.W/891130 Ltr | |
| ML19327B492 | 24 October 1989 | LER 89-017-00:on 890918,responsible Engineer Reviewed Plant Parameters & Concluded That Initial Conditions Required by Surveillance Test Procedure 209.001 Not Satisfied.Caused by Personnel Error & Procedural inadequacy.W/891024 Ltr | Missed surveillance |
| ML19327B345 | 24 October 1989 | LER 89-015-01:on 890825,pressurizer Safety Valve Body Inlet a Temp Increased to Greater than 450 F & Plant Shutdown Initiated.Cause Being Evaluated.Plant Parameters Monitored & Stabilized in Mode 3.W/891024 Ltr | Loop seal |
| ML19325C650 | 7 October 1989 | LER 89-016-00:on 890908,shutdown Occurred Due to Inoperable Msiv.Caused by Crushed Conduit That Resulted in Short Circuit of Test Circuit Wiring.Conduit/Test Circuit Wiring repaired.W/891006 Ltr | |
| ML20006B275 | 27 June 1989 | LER 89-011-01:on 890528,manual Reactor Trip Initiated Following Failure of Pressurizer Safety Valve When Valve Became Unseated,Causing Rapid Depressurization of Rcs.Temp Detectors Installed on Safety valve.W/900123 Ltr | Loop seal |
| ML20024F513 | 31 August 1983 | LER 83-091/03L-0:on 830802,while in Mode 1,borated Water Vol of Accumulator a Decreased to 7,354 Gallons.Caused by Valve Leakage in ECCS Check Valve Leakage Detection Sys.Valves Verified in Locked Position.Flange installed.W/830831 Ltr | |
| ML20024F455 | 31 August 1983 | LER 83-090/03L-0:on 830818,while Increasing Reactor/Turbine Power from 14 to 20%,rod Insertion Limit Violated.Caused by Operating Personnel Failure to Establish Plant Parameters. Emergency Boration initiated.W/830831 Ltr | |
| ML20024F222 | 31 August 1983 | LER 83-093/03L-0:on 830802,refueling Water Storage Tank Level Transmitter LT-991 Failed High.Caused by Internal Component Failure.Transmitter replaced.W/830831 Ltr | |
| ML20024F590 | 31 August 1983 | LER 83-092/03L-0:on 830817,east Wall Fire Barrier in Control Bldg Room CB-36-02 Declared Degraded When Unsealed Conduit Found in Newly Installed Juction Box.Caused by Personnel error.W/830831 Ltr | Fire Barrier Continuous fire watch Hourly Fire Watch |
| ML20024D911 | 1 August 1983 | LER 83-075/03L-0:on 830703,emergency Feedwater Valve IFV-3536 to Steam Generator a Tripped Shut on High Flow & Failed to Reset.Caused by Signal Comparator Card Failure. Card replaced.W/830801 Ltr | |
| ML20024D830 | 1 August 1983 | LER 83-078/03L-0:on 830709,Th Inputs to Subcooling Monitor Channel a Declared Inoperable Due to Low Indications.Caused by Intermittent Opening on Input Connections.Connectors tightened.W/830801 Ltr | |
| ML20024D798 | 1 August 1983 | LER 83-076/03L-0:on 830707,during Mode 1,pressurizer Power Relief Valve PCV-444B-RC Failed to Stroke Fully.Caused by Low Pressure Nitrogen Reservoir Failing to Charge Up to Pressure.Valves Will Be Inspected & readjusted.W/830801 Ltr | |
| ML20024D698 | 29 July 1983 | LER 83-074/03L-0:on 830603,during Emergency Diesel Generator a Operability Surveillance Test,Normal 115 Kv Power Supply to Vital Bus Lost & Diesel Generator Output Breaker Tripped Open.Caused by Electrical surge.W/830729 Ltr | |
| ML20024D857 | 28 July 1983 | LER 83-072/03L-0:on 830701,smoke Detector SMK-CB-3,Zone W-W, Would Not Reset at Integrated Fire & Security Panel.Caused by Failure to Teletype Printed Control Board in Cathode Ray Tube Circuitry.Component replaced.W/830728 Ltr | Fire Watch |
| ML20024B680 | 6 July 1983 | LER 83-055/03L-0:on 830609 & 10,smoke Detectors in Control Bldg Zone a Failed.Caused by Welding in Area.Fire Watch Patrol Initiated & Affected Detectors & Deluge Resettled. W/830706 Ltr | Fire Watch |
| ML20024B709 | 6 July 1983 | Updated LER 83-054/03L-1:on 830601,power Failure Occurred, Defeating One Gpm Leakage Alarm for Reactor Bldg Sump.Caused by Loose Power Supply Module Fuse Holder Grounding Power Supply.Module replaced.W/830706 Ltr | |
| ML20024B776 | 6 July 1983 | LER 83-058/03L-0:on 830607,smoke Detector IXA-4993G Failed to Respond to Simulated Alarm.Caused by Broken Base Assembly in Detector Due to Open Circuit Preventing Alarm Condition. Component replaced.W/830706 Ltr | Hourly Fire Watch |
| ML20024B982 | 1 July 1983 | LER 83-056/03L-0:on 830606,feedwater Flow Transmitter (FT-468) Steam Generator B Failed Low.Caused by Failure of Power Supply Card.Card replaced.W/830701 Ltr | |
| ML20024C037 | 1 July 1983 | LER 83-057/03L-0:on 830606,nitrogen Low Pressure Alarm on Low Pressure Accumulator for PORV Received in Control Room. Caused by Valve Position Indicator Lights Not Showing Full Actual Position.Limit Switches adjusted.W/830701 Ltr | |
| ML20024C260 | 30 June 1983 | LER 83-54/03L-0:on 830601 Plant Auxiliary Relay Rack XPN-6034 Balance Declared Inoperable Due to Power Failure. Caused by Loose Fuse Holder on Power Supply Module Grounding Supply.Module replaced.W/830630 Ltr | |
| ML20024C103 | 22 June 1983 | LER 83-051/03L-0:on 830524,control Room Evacuation Panel Pressurizer Relief Tank Level Indicator ILI-470A Removed from Svc Due to Low Readings.Caused by Instrument Drift. Upgraded Electronic Cards installed.W/830622 Ltr | |
| ML20023D456 | 13 May 1983 | LER 83-036/03L-0:on 830414,during Performance of Channel Calibr,Pressurizer Safety Valve Position Indication on Valves Failed to Function Properly.Caused by Excessive Current Flow During Contact Closure.Switch Assembly Changed | |
| ML20023B648 | 29 April 1983 | LER 83-032/03L-0:on 830331,detection Zone Nnn in Control Bldg Failed to Respond to Simulated Smoke Condition During Investigation of Alarm.Alarm Previously Received on 830329. Caused by Short in Smoke Detector.Detector Reinstalled | |
| ML20023B439 | 29 April 1983 | LER 83-033/03L-0:on 830331,while in Mode 5,source Range Detectors N-31 & N-32 Lost for Approx 5 Minutes.Caused by Maint Personnel Error in Placing Trains of Solid State Protection Sys in Wrong Position.Personnel Cautioned | |
| ML20028G086 | 1 February 1983 | LER 83-001/01T-0:on 830119,w/plant in Mode 1,three Refueling Water Storage Tank Level Transmitters Failed High. Caused by Frozen Instrument Lines.Transmitters Thawed. Insulated Encls Will Be Installed | |
| ML20028F472 | 21 January 1983 | LER 82-065/03L-0:on 821222,electrical Power Lost to Train a Radiation Monitoring Sys.During Investigation of Loss of Power,Maint Personnel Accidently Short Circuited Train B. Caused by Blown Power Fuses Due to Personnel Error | |
| ML20028E009 | 14 January 1983 | LER 82-060/03L-0:on 821215,Surveillance Requirement 4.3.3.6 Discovered Unperformed in Modes 1,2 & 3.Caused by Personnel Error.Procedure Revised | |
| ML20028E183 | 13 January 1983 | LER 82-059/03L-0:on 821215,w/plant in Mode 1,several Fire Doors Not Verified Closed.Caused by Doors Not Being Included in Auxiliary Operator Logs Rev & Therefore Not Checked.Log Being Revised to Ensure That Doors Checked | |
| ML20028E130 | 13 January 1983 | Revised LER 82-016/03L-2:on 821216,main Control Board Indicator PI-951 for Reactor Bldg Pressure Failed Low.Caused by Failure of Loop Power Supply Circuit Board When Exposed to Ambient Conditions.Circuit Board Replaced | |
| ML20028E077 | 13 January 1983 | LER 82-058/03L-0:on 821214,urgent Failure Alarm Due to Loss of Power Occurred During Restoration of Rod Control Sys Upon Completion of Power Operational Testing.Caused by Oxidation Between Fuse & Fuse Block Mating Surfaces | |
| ML20028E124 | 11 January 1983 | LER 82-057/03L-0:on 821213,turbine Bldg Sump Normal Discharge to Site Settling Ponds Temporarily Bypassed Via Auxiliary Pump & Fire Hose.Caused by Sump Pumps Becoming Clogged W/Debris from Const Repair Work Being Done | |
| ML20028D323 | 7 January 1983 | LER 82-056/03L-0:on 821209,surveillance Test Procedure, Nis Power Range Heat Balance, Not Performed in Specified Intervals.Caused by Personnel Oversight.Administrative Procedures for Control of Surveillances Revised | |
| ML20028D116 | 5 January 1983 | LER 82-053/03L-0:on 821206,during Mode 1,spurious High & Low Meter Indications Observed on Main Control Board Indicator FI-494 for Steam Generator C Flow.Caused by Failure of Circuit Board FY-494.Board Replaced |