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| Issue date | Title | Topic | |
|---|---|---|---|
| ML20024J247 | 6 October 1994 | LER 94-009-00:on 940909,EDG G-02 Inadvertently Started & Station Battery Charger D-08 Tripped Off Due to Blown Fuse. Caused by Inadequate Procedure.Blown Fuse Replaced & Electrical Distribution Sys Restored to normal.W/941006 Ltr | |
| ML20029C851 | 22 April 1994 | LER 94-001-00:on 940323,identified That Feedwater Flow May Have Been Underestimated Since Beginning of Operating Cycle. Caused by Degradation of Signals from Transducers.Transducer replaced.W/940422 Ltr | Flow Induced Vibration |
| ML20044E557 | 17 May 1993 | LER 92-009-01:on 921012,identified That Ccws Surge Tank Vent Valves Outside Design Basis Due to Oversight During Original Design of CCW Sys.Proposes to Replace Radiation Detector & Associated Circuitry W/Dedicated safety-related Sys | |
| ML20044E622 | 17 May 1993 | LER 93-006-00:on 930416,discovered That Outside CIV Not Leak Tested,Per TS 15.4.4.III.D Requirements Due to Review on 840202,recommending That Valve Be Tested During RHR Hydrostatic Testing.Subj Valve replaced.W/930517 Ltr | Boric Acid Hydrostatic |
| ML20044D881 | 14 May 1993 | LER 93-005-00:on 930415,containment Accident Fan Time Delay Relay 1-TDR-26 (Turbine Bldg Cooler Svc Water Inlet Valve 1SW-2880) Unexpectedly Closed.Caused by Failure to Recognize Presence of Relay in Contact.Function Changed | |
| ML20044D206 | 10 May 1993 | LER 93-003-00:on 930328,Point Beach Unit 2 Tripped Due to Surveillance Testing Problems.Test Procedures Can Trip Unit Due to Equipment or Human Failure.Failure Tests Delayed Until Unit 1 & Knpp Restored to power.W/930510 Ltr | |
| ML20024H215 | 21 May 1991 | LER 91-003-00:on 910429,charging Sys Check Valve 1-370 Discovered W/Leakage in Excess of Limits Due to Worn Disc Arm Bushing Steps.Worn Disc Arm Bushing Steps Cladded W/ E308 Weld Matl & Hand Filed to Design contour.W/910521 Ltr | Liquid penetrant |
| ML20029C210 | 20 March 1991 | LER 91-002-01:on 901009,inadvertent Start of Auxiliary Feedwater Pump Occurred.Caused by Inadequate Test Procedures.Auxiliary Feedwater Pump Secured & Maint Work Request Mwr 904517 initiated.W/910320 Ltr | Hydrostatic |
| ML20029C114 | 12 March 1991 | LER 91-010-01:on 900816,axial Flux Differential Outside Tech Specs Limits Due to Malfunction of Turbine Electrohydraulic Governor Control.Operator Training Revised. W/910319 Ltr | |
| ML20028H032 | 27 September 1990 | LER 90-011-00:on 900829,low Net Positive Suction Head to Containment Spray Pumps W/Eccs in Recirculation Mode Occurred.Caused by Procedural Deficiency.Temporary Procedure Changes initiated.W/900927 Ltr | |
| ML20043G201 | 8 June 1990 | LER 90-005-00:on 900510,steam Generator lo-lo Level Reactor Trip Occurred During Cold Shutdown.Caused by Inadequate Warning Sign Posting.Nonconformance Rept Written to Document Event & Recommend evaluation.W/900608 Ltr | |
| ML20042G776 | 9 May 1990 | LER 90-003-00:on 900409,determined That Piping & Supports in Fuel Oil Pumphouse Could Not Be Demonstrated to Perform Support Functions.Caused by Design Base Not Sufficiently Documented.Mod Performed to Support Fuel Oil Piping | |
| ML20042G779 | 8 May 1990 | LER 90-004-00:on 900404,single Failure Potential in Safeguards Switchgear B03/B04 Tie Breaker Discovered & Could Have Resulted in Failure of Diesel Generator.Control Power Fuses for Tie Breakers Removed | |
| ML20042F536 | 4 May 1990 | LER 90-001-00:on 900405,auxiliary Feed Pump Inadvertently Started.Caused by Inadequate Design.Schematic Push to Test Lamp Circuitry Will Be Added to Elementary Wiring Diagrams & Personnel Briefed on Potential circuitry.W/900504 Ltr | |
| ML20042F197 | 2 May 1990 | LER 90-002-00:on 900402,main Steam Safety Valve 1-MS-2013 Failed to Relieve Setpoint During Tech Spec Testing.Caused by Personnel Error During Setpoint Adjustment.Safety Valves 1-MS-2011,1-MS-2006 & 1-MS-2008 restored.W/900502 Ltr | Boric Acid Shutdown Margin |
| ML20011D513 | 19 December 1989 | LER 89-010-00:on 891120,auxiliary Feedwater Flow Transmitters Inadvertently Isolated.Caused by Error in Approved Procedure & Personnel Cognitive Error.Unit 1 Transmitters Valved Back Into Svc immediately.W/891219 Ltr | |
| ML19351A672 | 15 December 1989 | LER 89-009-00:on 891115,unexpected Steam Generator a lo-lo Level & Steam Generator B lo-lo Level Reactor Trip Signals Experienced.Caused by Installation of Analog Signal Generator.Procedures revised.W/891215 Ltr | |
| ML19332F701 | 11 December 1989 | LER 89-008-01:on 890910,ATWS Mitigating Actuation Circuitry Automatically Bypassed at About 42% Reactor Power.Caused by Less than Adequate Tech Spec Change.Power Descension to 38% initiated.W/891211 Ltr | |
| ML19332E722 | 7 December 1989 | LER 89-009-00:on 891107,D05 & D06 Station Batteries Declared Inoperable.Caused by Original Design Deficiency.Mod Completed to Restore Battery D05 to Operable Status by Replacing Eight nonsafety-related breakers.W/891207 Ltr | |
| ML19332E892 | 4 December 1989 | LER 89-008-00:on 891103,during Refueling,Contractor Personnel Generated False Trip Signal While Investigating Wiring Discrepancy in Reactor Protection Sys Instrument Racks.Caused by Labeling Error.Supply changed.W/891204 Ltr | Boric Acid Shutdown Margin |
| ML19332F090 | 28 November 1989 | LER 89-003-01:on 890712,tank B Level Channel 2LE-934 Began to Indicate Spuriously.Caused by Moisture Intrusion Between Halar Insulator & Sensing Rod.Level Detector Replaced & Channel Reestablished for Accumulator Tank B.W/891128 Ltr | |
| ML19332C841 | 22 November 1989 | LER 89-007-00:on 891027,Train a Safety Injection Signal Generated During Installation of Mod in Containment High Pressure Circuit.Caused by Inadequate Installation Procedure.Procedure changed.W/891122 Ltr | |
| ML19327C200 | 14 November 1989 | LER 89-006-01:on 891015,steam Generator Tubes Found Degraded,W/Undefined Signal & W/Axial Indications in Tubesheet Area.Degradation Caused by Time.Affected Tubes Plugged or Preventively sleeved.W/891114 Ltr | |
| ML19327C065 | 6 November 1989 | LER 89-005-00:on 891006,intermediate Range High Level Trip Signal Unexpectedly Generated During Course of Routine Source Range Channel Calibr.Caused by Loose Connection of Input/Output Cable.Connection tightened.W/891106 Ltr | |
| ML19327B306 | 19 October 1989 | LER 89-008-00:on 890910,ATWS Mitigating Actuation Circuitry Automatically Bypassed at About 42% Reactor Power, Disenabling Sys.Caused by High Tech Spec Setpoint.Enable/ Disable Setpoint Reset to 30%.W/891019 Ltr | |
| ML18041A161 | 16 November 1987 | LER 87-004-01:on 870515,voltage Lost on Red Instrument Bus Resulting in Reactor Protection Sys Actuation.Caused by Excessive Current Demand by ferro-resonant Circuit.Plant Mods to Load Bank Proposed | |
| ML18041A134 | 3 July 1986 | LER 86-003-00:on 860603,reactor Trip Occurred Due to Loss of Power on White Instrument Bus.Caused by Trip of White Inverter Output Breaker.Procedures for Placing Inverter on Line Will Be revised.W/860703 Ltr | Safe Shutdown |
| ML20028E355 | 13 January 1983 | LER 82-029/03L-0:on 821216,automatic Monitoring & Alarm Program Constant Found Incorrect.Caused by Unknown Personnel W/Access to on-line Computer.Value of Constant Restored & Control Rods Alignment Verified | |
| ML20028E238 | 13 January 1983 | LER 82-028/03L-0:on 821215,routine Test on Fire Detection Sys Found Panel D407 Which Monitors Unit 1 Rod Drive Room Inoperable.Caused by Blown Fuse.Fuse & Indication Lights Replaced on 821215.Detection Sys Undergoing Design Review | Hourly Fire Watch |
| ML20028E179 | 13 January 1983 | Updated LER 82-020/01X-1:on 821102,while Performing Type B & C Leakage Tests of Containment Penetrations & Isolation Valves,One Valve Had Leakage Exceeding Limit.Cause Not Stated.Valve Clapper & Seat Lapped | Fuel cladding |
| ML20028E303 | 11 January 1983 | LER 82-027/03L-0:on 821211,operator Noted That Steam Generator Pressure Transmitter 1PT-469 Indicated Higher than Other Channels.Caused by Frozen Sensing Line Due to Inadequate Interim Piping Insulation | |
| ML20028E321 | 10 January 1983 | Updated LER 82-017/01X-2:on 821030,w/unit Shut Down for Refueling,Eddy Current Exam of Steam Generator Tubes Indicated Four Tubes in Steam Generator a & Three Tubes in Steam Generator B Exceeded Plugging Limit.Caused by Caustic | Boric Acid Hydrostatic |
| ML20028C243 | 27 December 1982 | LER 82-020/01T-0:on 821103,following Type B & C Leak Rate Tests,Total as-measured Leakage Exceeded Tech Spec Limit, Causing Reactor Coolant Pump Component Cooling Water to Have Excessive Leakage.Cause Not Stated.Clapper & Seat Lapped | Fuel cladding |
| ML20023B325 | 10 December 1982 | Updated LER 82-017/01T-1:on 821030,verified That Indications for Four Steam Generator a Tubes & Three Steam Generator B Tubes Exceeded 40% Plugging Limit During Eddy Current Exam on 821026-30.Cause Not Stated.Tubes Mechanically Plugged | Boric Acid Hydrostatic |
| ML20028B415 | 15 November 1982 | LER 82-017/01T-0:on 821030,four Tubes in Steam Generator a & Three Tubes in Steam Generator B Indicated Degradation Greater than 40% Plugging Limit.Caused by Intergranular Attack.Tubes Mechanically Plugged | Boric Acid Hydrostatic |
| ML20028A037 | 5 November 1982 | LER 82-008/03L-0:on 821006,low Steam Line Pressure Setting for Pressure Instrument 2PT-478 Found Lower than Allowed by Tech Specs.Caused by Bumping of Setpoint Adjustment Knob.Instrument Tested & Realigned | |
| ML20027D682 | 3 November 1982 | LER 82-018/01T-0:on 821015,incorrect Instrument Bus Supply Shifted to Alternate Supply Following Rept of Fire in Supply Breaker for 1GYO4 Motor Generator Set,Causing Loss of Redundancy on Containment Pressure Indicator 1PT-950 | |
| ML20052G450 | 12 May 1982 | LER 82-002/01T-0:on 820428,during Eddy Current Exam, Discovered Abnormal Degradation in Fuel Cladding,Rcpb & Primary Containment.Seludge Lancing Will Be Performed | Fuel cladding |
| ML20052G370 | 7 May 1982 | LER 82-009/03L-0:on 820408,4.16-kV Safeguards Undervoltage Relays Did Not Meet 0-volt Time Delay Spec.Caused by Manufacturer Characteristic Curves.Relays Not Capable of Less than 0.38-s.Tech Spec Change Requested on 820427 | |
| ML20052G383 | 7 May 1982 | LER 82-011/03L-0:on 820415,during Biweekly Calibr Check ICP 2.1 of Reactor Protective Sys Functions,Overpower Delta T Setpoint 2 for Channel 2 Found Less Conservative than Tech Spec Limit.Caused by Setpoint Drift in Impulse Summer Unit | |
| ML20052G633 | 7 May 1982 | LER 82-010/03L-0:on 820414,ICP 2.9 Found Not to Provide for Proper Unblocking of Source Range High Flux Reactor Trip Over Small Range of Instrument Readings.Caused by Failure to Identify Subtle Procedural Flow.Procedure to Be Revised | |
| ML20052B452 | 23 April 1982 | LER 82-008/03L-0:on 820323,minor Installation Defects Noted on Four of Six Containment Pressure Transmitters Installed as TMI Response Mod.Caused by Backfit Contractor QC Program Breakdown | Backfit |
| ML20050B266 | 25 March 1982 | LER 82-006/01T-0:on 820311,type B & C Valve Leakage Tests Exceeded Tech Spec Limits.Caused by Corrosion.Svc Air Check Valves Disc Replaced & Valve Cover Remachined | |
| ML20041F486 | 8 March 1982 | LER 82-005/01T-01:on 820222,poison Test Samples & Two Fuel Assemblies W/Less than 1-yr Cooling Period Found Placed Next to Divider Wall in Spent Fuel Pool.Caused by Tech Spec Misinterpretation | |
| ML20041E491 | 4 March 1982 | LER 82-004/03L-0:on 820206,during Inservice Testing, Differential Pressure Instrument 4007 for Auxiliary Feed Pump P38A Found Isolated.Probably Caused by Failure to Return Instrument to Svc Following Calibr | |
| ML20041E613 | 2 March 1982 | LER 82-003/01T-0:on 820217,during Surveillance Testing, Emergency Diesel Generator 3D Failed to Operate.Caused by Sticking Shutdown Solenoid Plunger on Woodward Type UG8 Governor.Solenoid Cleaned,Checked & Generator Tested | |
| ML20049H698 | 23 February 1982 | LER 82-001/03L-0:on 820203,boric Acid Heat Tracing Circuit P-42 Found Inoperable.Caused by Failed Thermon Type 4 Circuit Controller.Circuit Controller Replaced | Boric Acid |
| ML20040G681 | 5 February 1982 | LER 82-001/03L-0:on 820107,steam Generator Pressure Sensing Lines Discovered Frozen on a Steam Generator.Caused by Inadequate Freeze Protection & Extremely Cold Weather.Addl Heat Lamps Installed | |
| ML20040G580 | 5 February 1982 | LER 82-002/03L-0:on 820112,during Hot shutdown,1PT-469 Steam Generator Pressure Transmitter Isolated by Maint Personnel Due to Leaking Coupling.Pressure Sensing Tubing Showed Signs of Steam Leak Due to Freezing | |
| ML20040D379 | 18 January 1982 | LER 81-020/03L-0:on 811219,frozen Sensing Line Caused High Indication of Steam Generator Pressure Instrument 1PT-482. Caused by Incomplete Insulation of Line & by Cold Weather. Instrument Placed in Tripped Position & Tubing Thawed |