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| Issue date | Title | Topic | |
|---|---|---|---|
| ML20046B484 | 30 July 1993 | LER 93-006-00:on 930703,auxiliary Feedwater Signal Inadvertently Actuated Due to Personnel Error.Equipment Reset to Normal Lineup & Fuses Removed for Reinstallation Prior to Reactor startup.W/930730 Ltr | |
| ML20045H761 | 16 July 1993 | LER 93-007-00:on 930626,CR Alarm Received,Indicating Excessive Temp on Reactor Coolant Pump Motor Stator 1-04 & Manual Trip Initiated.Caused by RTD Failure.Rtd Terminations Disconnected & AOP revised.W/930716 Ltr | |
| ML20045A991 | 11 June 1993 | LER 93-004-00:on 930514,failure to Satisfy TS Surveillance for Verification of Valve Position Due to Valve Discrepancies Discovered During DBD Review.Valve Cap & Clearance installed.W/930611 Ltr | Missed surveillance |
| ML20045A468 | 3 June 1993 | LER 93-003-00:on 930504,manual Reactor Trip Occurred Following Inadvertent Closure of Fwiv.Caused by Instrumentation Channel Error.Maint Performed on Affected Instrumentation channels.W/930603 Ltr | |
| ML20044G407 | 26 May 1993 | LER 93-006-00:on 930426,failure to Satisfy TS Surveillance Requirement for Primary Plant ESF Exhaust Filtration Unit Noted.Caused by Poor Labeling,Specification of Wrong Procedure & Discrepancy in Parts list.W/930526 Ltr | |
| ML20024H158 | 21 May 1991 | LER 91-016-00:on 910418,failure of Check Valve to Prevent Backflow Discovered.Caused by Mfg Error in Machining Process of Valve Body Casting.Valves Reassembled & Scheduled to Receive testing.W/910521 Ltr | |
| ML20024G721 | 25 April 1991 | LER 91-012-00:on 910326,potential Gas Binding of Centrifugal Charging Pumps Due to Voids in Boric Acid Gravity Feed Line Identified.Caused by Hydrogen Coming Out of Solution in Lower Pressure Ccp Suction header.W/910425 Ltr | Boric Acid |
| ML20024G680 | 22 April 1991 | LER 91-010-00:on 910322,unit 1 Operated Outside Tech Spec Due to Auxiliary Feedwater Sys Test Line Isolation Valve Not Closed.Root Cause Not Determined.Providing Addl Guidance to Operators & Operators Monitoring valves.W/910422 Ltr | Safe Shutdown |
| ML20029B642 | 12 March 1991 | LER 91-004-00:on 910210,potential Transformer Drawer Opened at Bottom of Switchgear Bus 1A3 Auxiliary Cubicle,Causing Load Shed Signal & Reactor Trip.Caused by Personnel Error. Labels Attached to Switchgear bus.W/910312 Ltr | Safe Shutdown |
| ML20028G955 | 27 September 1990 | LER 90-026-00:on 900828,surveillance Missed Due to Inadequate Procedural Requirements.Caused by Inadequate Manual Surveillance Scheduling Methods.Station Procedures revised.W/900927 Ltr | Missed surveillance Grace period |
| ML20044A135 | 26 June 1990 | LER 90-017-00:on 900527,main Feedwater Flow Control Valve Failed Closed,Resulting in Reduced Feedwater Flow & Decreasing Steam Generator Water Level.Caused by Failure of Solenoid Valve Coil.Solenoid Coil replaced.W/900626 Ltr | |
| ML20044A328 | 22 June 1990 | LER 90-016-00:on 900521,engineering Determined That Three Atmospheric Relief Valves Declared Inoperable Resulting in Entry Into Tech Spec Limiting Condition for Operation 3.0.3. Pneumatic Controls Drifted Out of calibr.W/900622 Ltr | Backfit |
| ML20043H197 | 19 June 1990 | LER 90-015-00:on 900520,chemistry Sample Special Condition Surveillance Missed.Caused by Procedural Error.Procedures Revised to Provide Appropriate Cautions Re Required Sample. W/900619 Ltr | Missed surveillance Power change |
| ML20043G112 | 13 June 1990 | LER 90-014-00:on 900514,containment Penetration Improperly Isolated While Containment Isolation Valve Made Inoperable for Repairs.Caused by Inadequate Review of Work Order. Supervisor Counseled & Shift Order issued.W/900613 Ltr | |
| ML20043F157 | 8 June 1990 | LER 90-013-00:on 900509,while Installing Jumpers Across Feedwater Pump Speed Controllers,Pump Coastdown Occurred, Resulting in Loss of Feedwater Flow & Reactor Trip.Caused by Inadequate Procedure Review.Review performed.W/900608 Ltr | |
| ML20043E451 | 7 June 1990 | LER 90-012-00:on 900508,control Room Personnel Failed to Satisfy Time Limit for Completion of Action Required by Tech Specs Re Plant Radiation Monitoring.Caused by Personnel Error.Individual Counseled & Procedure revised.W/900607 Ltr | Offsite Dose Calculation Manual |
| ML20043F494 | 4 June 1990 | LER 90-011-00:on 900504,Pressure Instrument Root Isolation Valve 1SI-8961 Open When Procedure Indicated Valve Should Be Locked Closed.Caused by Lack of Clear Instructions Re Definition of Physical Work. Valve locked.W/900604 Ltr | |
| ML20043C020 | 29 May 1990 | LER 90-010-00:on 900428 & 29,2-h Surveillance Interval, Including 25% Extension Allowed by Tech Spec 4.0.2,exceeded. Caused by Personnel Error.Procedure Enhancements Initiated & Personnel Involved counseled.W/900529 Ltr | Missed surveillance |
| ML20043A669 | 18 May 1990 | LER 90-009-00:on 900421,reactor Trip Occurred Due to Accidental Bumping of Source Range Reactor Trip Reset/Block Previously Bypassed for Power Operation.Order Issued Suspending Cleaning of Control boards.W/900518 Ltr | |
| ML20043A613 | 16 May 1990 | LER 90-008-00:on 900416,Train a Diesel Generator Rendered Inoperable Due to Failure to Complete post-work Operability Testing on Starting Air Receiver Check Valve 01. Caused by Inadequate Review.Procedure revised.W/900516 Ltr | |
| ML20043A611 | 16 May 1990 | LER 90-007-00:on 900416,ESF Actuation Signal Occurred, Resulting in Train a of Control Room Air Conditioning Sys Shifting to Emergency Recirculation Mode.Caused by Personnel Error.Handswitch Added to Radiation monitor.W/900516 Ltr | |
| ML20043A420 | 14 May 1990 | LER 90-006-00:on 900412,P-6 Permissive Signal Received & Source Range Flux Doubling (Srfd) Actuation Occurred.Caused by Inadvertent Reset of Srfd Block.Integrated Plant Operations Procedures changed.W/900514 Ltr | |
| ML20012B649 | 9 March 1990 | LER 90-001-00:on 900209,reactor Protection Sys Actuation Occurred Due to Spike on Range Channel.Appropriate Source Range Procedures Revised to Require Insertion of Flux Doubling Signal Block Prior to withdrawal.W/900309 Ltr | Shutdown Margin |