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| Issue date | Title | Topic | |
|---|---|---|---|
| ML20029E335 | 10 May 1994 | LER 94-006-00:on 940415,both Trains of CREVS Declared Inoperable.Caused by Tornado Warning & Sighting of Tornado Moving Toward Plant.Tornado Warnings downgraded.W/940510 Ltr | |
| ML20029E202 | 9 May 1994 | LER 94-004-00:on 940408,determined That TS Pressurizer Cooldown Limit Exceeded on 930618 & Not Restored within Required Timeframe.Caused by Unanticipated Sys Interaction. SI for Check Valve Opening Tests revised.W/940509 Ltr | |
| ML20029D815 | 3 May 1994 | LER 94-005-00:on 940403,inadvertent Fwis Occurred.Caused by Personnel Failure to Follow Work Document Instructions. Corrective Action:Individuals Were Counseled on Requirements to Follow Work Document Instruction steps.W/940503 Ltr | |
| ML20046B835 | 30 July 1993 | LER 93-017-00:on 930621,discovered 24-hour Telephone Notification Had Not Been Carried Out as Required by TS LCO 3.7.11.1 Action Statement (b)(2)(a) Due to Personnel Error. NRC Informed of Missed notification.W/930730 Ltr | |
| ML20046B850 | 30 July 1993 | LER 93-018-00:on 930704,DG Started Due to Improper WO Planning.Restored Power to 1BB Shutdown Board & Stopped Running DGs.W/930730 Ltr | |
| ML20046A469 | 19 July 1993 | LER 93-016-00:on 930619,Phase A,Auxiliary Bldg & Containment Isolations Manually Initiated as Result of Fuel Assembly Failing to Remain in Upright Position After Being Released. All Fuel Movement stopped.W/930719 Ltr | |
| ML20045J011 | 14 July 1993 | LER 93-015-00:on 930614,1A Start Bus Alternate Feeder Breaker Tripped Upon Start of Unit 1 RCP Which Resulted in Start of DG Due to Current Transformer Wired Incorrectly. Restored Offsite Power & Secured Final DG.W/930714 Ltr | |
| ML20045H017 | 12 July 1993 | LER 93-014-00:on 930611,determined That Inadequate Ventilation Design Resulted in Potential Inoperability of Vital Power Equipment.Design Being modified.W/930712 Ltr | Condition Adverse to Quality |
| ML20045B995 | 15 June 1993 | LER 93-004-01:on 930222,determined That Blind Flange on Elevation 734 Personnel Airlock Outer Housing Leaking.Due to Improper Installation of Blind Flange.Evaluation Performed of Other 14 Double O-ring Blind flanges.W/930615 Ltr | |
| ML20045B931 | 10 June 1993 | LER 93-013-00:on 930514,fire Watch Was Not Performed within Time Frame Required by Tech Specs Due to Inadequate Supervision by Fire Protection Foreman.Fire Watch Patrol reestablished.W/930610 Ltr | Fire Protection Program Fire Watch |
| ML20045A726 | 7 June 1993 | LER 93-011-00:on 930507,discovered That Fire Barrier Breached W/O Proper Compensatory Measures Established.On 930505,door Leading to Room Housing Containment Spray HX 1A Breached.Roving Fire Watch Established & LCO 3.7.12 Entered | Fire Barrier Fire Watch |
| ML20044H450 | 3 June 1993 | LER 93-012-00:on 930504,apparent Failure to Properly Identify & Plug SG Tube Determined to Exceed TS Plugging Limit.Caused by eddy-current Coordinator Not Ensuring Task requirements.Eddy-current Procedure revised.W/930603 Ltr | |
| ML20044H156 | 28 May 1993 | LER 93-010-00:on 930430,Westinghouse Identified Error in Development of Calculations for Cold Overpressure Mitigation Sys Setpoints.Caused by Vendor Failure to Consider Elevation Difference.Engineering Evaluation Performed | |
| ML20044E634 | 17 May 1993 | LER 93-009-00:on 930417,TS Surveillance Not Performed for Three Pipe Support Snubbers Because of Omission of Snubbers from Surveillance Instruction for Visual Insp.Snubbers Visually Inspected & Functionally tested.W/930517 Ltr | |
| ML20044B675 | 23 February 1993 | LER 93-001-00:on 930124,Unit 1 Ice Bed Temperature Recorder in MCR Declared Inoperable.Caused by Ineffective Communication.Appropriate Personnel Involved W/Event Have Been counseled.W/930223 Ltr | Missed surveillance |
| ML20044B614 | 21 January 1993 | LER 92-026-00:on 921222,determined That Several ASME Section XI Pressure Tests Not Performed Due to Section XI Program Implementation Not Being well-defined,controlled or Documented.Test Expeditiously performed.W/930121 Ltr | |
| ML20024H244 | 22 May 1991 | LER 91-007-00:on 910422,LCO 3.0.3 Entered When Shaft of Train a Main Control Room Air Handling Unit Failed from Fatigue & Train B Out of Svc for Maint.Caused by Shaft Misalignment.New Shaft installed.W/910522 Ltr | |
| ML20029C176 | 21 March 1991 | LER 91-002-00:on 910211,unit Operated in Condition Prohibited by Tech Spec 3.3.3.8 Limiting Condition for Operation.Cause Under Investigation.Night Order Issued to Personnel Re Removal of Equipment from svc.W/910321 Ltr | Fire Protection Program Fire Watch |
| ML20029C123 | 18 March 1991 | LER 90-016-01:on 901117,determined That Calibr of Nuclear Instrumentation Sys intermediate-range Channels Set Nonconservatively.Caused by Lack of Operability Control for Rod Motion.Action Plan developed.W/910318 Ltr | Shutdown Margin Condition Adverse to Quality |
| ML20029A671 | 25 February 1991 | LER 91-002-00:on 910124,LCOs 3.0.5 & 3.8.1.1 Entered When Both Trains of Emergency Gas Treatment Sys Declared Inoperable.Caused by Blown Fuse & Excessive Cycling of Air Start Sys.Fuse replaced.W/910225 Ltr | |
| ML20028H033 | 27 September 1990 | LER 90-019-00:on 900828,failure to Update P-250 Plant Computer Constants Resulted in Axial Flux Difference.Caused by Inadequate Procedures & Inappropriate Personnel Actions. Procedure 0-PI-NXX-092-001.0 revised.W/900927 Ltr | |
| ML20028G920 | 26 September 1990 | LER 90-020-00:on 900829,ventilation Sys Inoperable Due to Train B Diesel Generator Out of Svc.Caused by Stuck Microswitch Contacts on Pressure Switch 0-PS-311-172. Pressure Switch Adjusted & Returned to svc.W/900926 Ltr | Condition Adverse to Quality |
| ML20044A936 | 9 July 1990 | LER 90-011-00:on 900608,determined That Actual Nuclear Instrumentation Sys Power Range Detector Currents Were 20% to 31% Lower than Predicted.Caused by Calibr Values Being Incorrectly Calculated.Channels corrected.W/900709 Ltr | |
| ML20044A324 | 25 June 1990 | LER 90-010-00:on 900526,limiting Condition for Operation Entered Because MSIV Failed to Close When Another MSIV Inoperable for Maint.Cause Attributed to Valve Stem & Valve Guide Binding.Operations Training Ltr issued.W/900625 Ltr | |
| ML20043H509 | 21 June 1990 | LER 90-009-00:on 900527,automatic Start of Auxiliary Feedwater Pumps Occurred When Both Main Feedwater Pumps Placed in Tripped Condition.Caused by Personnel Error.Trip Circuitry Reset & Operators counseled.W/900621 Ltr | |
| ML20043E540 | 7 June 1990 | LER 90-008-00:on 900514,two Control Room Isolations Occurred as Result of Spurious Spikes.Caused by Loose Terminations on Relay Socket.Loose Connections Properly terminated.W/900607 Ltr | |
| ML20043A421 | 16 May 1990 | LER 90-010-00:on 900416,containment Ventilation Isolation Occurred.Caused by Allowing Gaseous Radiation Level to Increase Too Close to Alarm Setpoint.Recovery from Isolation initiated.W/900516 Ltr | Preplanned Activity |
| ML20043A226 | 14 May 1990 | LER 90-009-00:on 900404,lower Containment Radiation Monitor Found Inoperable & Lower Containment Atmosphere Aligned to Upper Containment Radiation Monitor During Sampling.Caused by Personnel Error.Chemistry Training revised.W/900514 Ltr | |
| ML20043A227 | 14 May 1990 | LER 90-006-00:on 900414,auxiliary Bldg Isolation Occurred from Spent Fuel Pit Area Radiation Monitors 0-RM-90-102 & 103.Caused by Personnel Error.Training Ltr Issued to Instrument Mechanics & Operations personnel.W/900514 Ltr | |
| ML20043A220 | 14 May 1990 | LER 90-007-00:on 900413,discovered That Tech Spec Surveillance Requirement Not Performed within Required Interval.Caused by Personnel Error.Surveillance Successfully Performed Since missed.W/900514 Ltr | Condition Adverse to Quality Missed surveillance |
| ML20042G786 | 9 May 1990 | LER 90-005-00:on 900409,emergency Start of Four Emergency Diesel Generators Occurred While Attempting Transfer of Power.Caused by Personnel Error.Individuals Reprimanded, Training Initiated & Procedures revised.W/900509 Ltr | Safe Shutdown |
| ML20042G793 | 9 May 1990 | LER 90-008-00:on 900410,reactor Trip Occurred Resulting from General Warning Alarm on Both Trains of Solid State Protection Sys.Caused by Personnel Error.Individuals Disciplined & Site Wide Message distributed.W/900509 Ltr | Shutdown Margin |
| ML20042F374 | 2 May 1990 | LER 90-003-00:on 900404,control Room Ventilation Sys (CRVS) Transferred to Pressurization Mode.Caused by Electrical Transient in Vital Instrument Ac Bus PY-21A.CRVS Reset & Returned to Normal Operating modes.W/900502 Ltr | |
| ML20042E419 | 13 April 1990 | LER 90-007-00:on 900317 & 26,containment Ventilation Isolations Occurred During Purge Activities.Caused by Inadequate Procedural Guidance for Setpoint Determination. Alarm & Trip Setpoints increased.W/900413 Ltr | Preplanned Activity |
| ML20042E202 | 13 April 1990 | LER 90-005-00:on 900315,inadvertent Containment Vent Isolation Occurred While Preparing to Purge Containment. Caused by Lack of Attention to Detail by Operator.Operator Counseled & Received Administrative reprimand.W/900413 Ltr | |
| ML20012F522 | 5 April 1990 | LER 90-006-00:on 900307,containment Ventilation Isolation Occurred.Caused by Containment Particulate Level Too Close to Setpoint.Module Replaced.Radiation Alarm Setpoint Increased from 10% to 40% of Tech Spec limit.W/900406 Ltr | Preplanned Activity |
| ML20012D861 | 23 March 1990 | LER 90-004-00:on 900221,handswitches Controlling Operation of Isolation Valves on Steam Supply Line to Auxiliary Feedwater Pump Found in Manual Position.Cause Undetermined. Handswitches Placed in P-auto position.W/900323 Ltr | Unanalyzed Condition |
| ML20012C427 | 12 March 1990 | LER 90-003-00:on 900211,inadvertent Containment Vent Isolation Occurred.Caused by Lack of Attention to Detail in That Operator Did Not Look Closely Enough at Switch Designations.Personnel Involved counseled.W/900312 Ltr | |
| ML20011F719 | 1 March 1990 | LER 89-031-01:on 891205,RHR Pumps Determined to Have Deadheading Problem Identified by NRC Bulletin 88-004.Caused by Inadequate Technical Response to Bulletin.Training Ltr Issued to 10CFR50.59 reviewers.W/900301 Ltr | Condition Adverse to Quality |
| ML20011F742 | 26 February 1990 | LER 90-002-00:on 900127,control Room Isolation Occurred When Circuit Breaker Opened Supplying Power to Radiation Monitor. Caused by Failure by Personnel to Exercise Sufficient Caution.Responsible Engineers reinstructed.W/900226 Ltr | |
| ML20011F739 | 26 February 1990 | LER 90-002-00:on 891122,value for Distance from Floor to Ctr Line of Level Switch 2-LS-87-21 Transposed in Variable Leg Calculation.Caused by Inattention to Detail.Procedure Revised to Replace Incorrect setpoint.W/900226 Ltr | Stroke time Condition Adverse to Quality |
| ML20006E331 | 9 February 1990 | LER 90-001-00:on 900112,Limiting Condition for Operation 3.0.3 Entered When Three of Four Lower Compartment Cooler Fan Motors Exceeded Lubrication Frequency.Caused by Personnel Error.Personnel counseled.W/900209 Ltr | |
| ML20006D534 | 7 February 1990 | LER 90-001-00:on 900108,discovered That Several ERCW Valves Not Being Periodically Verified to Be Correct.Caused by Personnel Error During Procedure Revs & Workplan Reviews. Info Notice Issued to Workplan reviewers.W/900207 Ltr | |
| ML19354E163 | 22 January 1990 | LER 89-036-00:on 891221,discovered That Surveillance Test Results Used for Declaring Diesel Generator 1B-B Operable Deficient.Caused by Instruction Not Including 60 Minute Run Time.Event Will Be Reviewed w/supervisors.W/900122 Ltr | Time of Discovery Offsite Circuit |
| ML19354D894 | 16 January 1990 | LER 89-034-00:on 891215,leak Identified from Fitting on Vol Control Tank Level Transmitter & Auxiliary Bldg Evacuated, Preventing Fire Watch Patrol from Entering Bldg for Hourly Rounds.Fitting tightened.W/900116 Ltr | Fire Barrier Fire Watch Hourly Fire Watch |
| ML19354D906 | 16 January 1990 | LER 89-033-00:on 891216,refueling Water Storage Tank Level Transmitters Failed High Due to Freezing from Extremely Cold Weather & Inappropriate Use of Calculations.Engineering Procedures Revised & Heating Installed in encl.W/900116 Ltr | Condition Adverse to Quality Fire Watch |
| ML20005F885 | 9 January 1990 | LER 89-035-00:on 891210,turbine/reactor Trip Occurred from hi-hi Feedwater Level of 75% in Steam Generator 3.Caused by Failure of Loop 3 Main Feedwater Regulating Valve to Close. Equipment Adjusted & repaired.W/900109 Ltr | Shutdown Margin |
| ML20005E080 | 22 December 1989 | LER 89-032-00:on 891205,RHR Pumps Determined to Have Deadheading Problem,Per NRC Bulletin 88-004,resulting in Plant Operation Outside Design Basis.On 891128,RHR Pump Exceeded Head Criteria.Pumps started.W/891222 Ltr | |
| ML20005E083 | 22 December 1989 | LER 89-032-00:on 891201,discovered That Tech Spec Surveillance Requirement to Verify That Valves 1-67-748 & 2-67-748 in Open Position Not Met.Caused by Personnel Error.Correct Valve Position verified.W/891222 Ltr | Time of Discovery Condition Adverse to Quality |
| ML20005E116 | 22 December 1989 | LER 89-030-00:on 891204,fire Suppression Sys Deluge Valve Isolated More than 1 H W/O Required Continuous Fire Watch Establishment.Caused by Personal Communication Breakdown. Valve Opened & Foreman in Charge counseled.W/891222 Ltr | Continuous fire watch |