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| Issue date | Title | Topic | |
|---|---|---|---|
| ML20046A487 | 23 July 1993 | LER 93-001-00:on 930607,determined RCP Uv & Underfrequency Portion of Rt Sys,& TDAFP Autostart Signal from RCP Bus Uv Contained Design Deviation Due to Personnel Error. Procedural Guidance enhanced.W/930723 Ltr | |
| ML20044D133 | 11 May 1993 | LER 91-007-01:on 910629,two Neutral Overcurrent Relays on Unit 1B Auxiliary Transformer Actuated,Resulting in Generator Trip & Reactor Trip.Caused by Electrical Fault. Loose Strand Removed from conductor.W/930511 Ltr | |
| ML20024G719 | 23 April 1991 | LER 91-001-00:on 910401,reactor Trip Occurred When Rod Dropped in Core.Caused by Defective Circuit Card in Rod Control Sys.Suspect Circuit Cards Replaced & Sent to Westinghouse for evaluation.W/910423 Ltr | |
| ML20043F168 | 8 June 1990 | LER 90-001-00:on 900512,reactor Tripped Due to lo-lo Water Level in Steam Generator 2A.Caused by Procedural Inadequacy. Procedure FNP-2-STP-151 Revised to Provide Addl Initial Conditions to Prevent Subj event.W/900608 Ltr | |
| ML20012D959 | 20 March 1990 | LER 90-002-00:on 900222,two Cases Found Where Surveillance Testing Procedures Did Not Perform All Tests Required by Tech Specs.Caused by Inadequate Procedural Guidance. Procedures revised.W/900320 Ltr | |
| ML20012C303 | 13 March 1990 | LER 90-001-00:on 900213,fire Watch Not Established within Required Time Period Due to Personnel Error.Administrative Procedure FNP-0-SOP-0.4 Revised & Personnel Retrained on requirements.W/900313 Ltr | Continuous fire watch Fire Protection Program Fire Watch Hourly Fire Watch |
| ML20012B485 | 6 March 1990 | LER 83-039/03X-2:on 830726,discovered That Handwheel for Inner Door of Personnel Airlock in Shut Position & Partially Opened.Caused by Excessive Use of Door During Outages.Door Repaired & Returned to Operable status.W/900306 Ltr | |
| ML19354E334 | 23 January 1990 | LER 89-016-00:on 891228,discovered That Required Surveillance for Plant Vent Stack Radioactive Gas Monitor Not Performed.Caused by Personnel Improperly Scheduling Surveillance for Time Later than Due date.W/900123 Ltr | |
| ML20011D561 | 18 December 1989 | LER 89-015-00:on 891118,reactor Tripped Due to Turbine Trip. Caused by Voltage Transient in Power Circuit to Digital electro-hydraulic Control Sys & Inverter Failure.Inverter Repaired & Returned to svc.W/891218 Ltr | |
| ML19332F906 | 13 December 1989 | LER 89-008-00:on 891113,containment Integrity Not Maintained for Approx 30 S.Caused by Personnel in That Inner Door Was Left Blocked Open.Personnel Counseled & Interim Administrative Controls established.W/891213 Ltr | |
| ML19332F676 | 12 December 1989 | LER 89-007-00:on 891112,both Motor Driven Auxiliary Feedwater Pumps Failed to Start Manually by Operator.Caused by Cognitive Personnel Error Re Design Change.Wiring Discrepancy Corrected & Pump Returned to svc.W/891212 Ltr | |
| ML19351A457 | 12 December 1989 | LER 89-014-00:from 891115-16,Tech Spec 3.0.3 Entered Voluntarily to Repair Leaking Containment Purge Isolation Dampers.Caused by Need to Repair Dampers.Dampers Closed & Automatic Isolation Feature restored.W/891212 Ltr | |
| ML19332F085 | 7 December 1989 | LER 89-006-00:on 891112,safety Injection & Reactor Trip Initiated Due to Low Steam Line Pressure.Caused by Personnel Error Involving Misconfiguration of Circuit Valve.Personnel Involved counseled.W/891207 Ltr | |
| ML19327C262 | 14 November 1989 | LER 89-012-00:on 891018,reactor Tripped Due to lo-lo Steam Generator Level Due to Closure of Governor Valves.Caused by Design Error in Digital electro-hydraulic Control Sys.Valve Position Limiter Feature removed.W/891114 Ltr | |
| ML19327C267 | 14 November 1989 | LER 89-013-00:on 891019,reactor Tripped Due to lo-lo Level in Steam Generator 2C.Caused by Operator Incorrectly Transferring Steam Generator Level Control to Main Feedwater.Involved Personnel counseled.W/891114 Ltr | |
| ML19354D469 | 1 November 1989 | LER 89-005-00:on 890930 & 1001,core Alterations Performed W/O Establishing Containment Refueling Integrity.Caused by Cognitive Personnel Error.Personnel Involved in Event Counseled.Containment Procedure strengthened.W/891101 Ltr | |
| ML19327B545 | 25 October 1989 | LER 89-011-00:on 890925,discovered That Tech Spec 4.6.3.1.a Surveillance Requirement Re Containment Air Lock Outer Door Not Done.Caused by Personnel Error.Individuals Involved Counseled Re Importance of Subj requirements.W/891025 Ltr | Missed surveillance |
| ML19325D494 | 17 October 1989 | LER 89-004-00:on 890616,determined That Calculations Were Not Available to Demonstrate That Svc Water Sys Capable of Supplying Design Flow to safety-related Loads Under Scenario of Seismic event.W/891017 Ltr | |
| ML19325D246 | 12 October 1989 | LER 89-010-00:on 890920,reactor Tripped Manually Following Loss of Operating Steam Generator Feed Pump.Caused by Inadvertent Opening of Overspeed Trip Test Valve.Individual Involved in Event Counseled to Be More aware.W/891012 Ltr | |
| ML19325C748 | 10 October 1989 | LER 89-009-00:on 890525,determined That Power Range Nuclear Instrumentation Channels Reading Approx 7% Low.Equalizing Valves on Two of Three Instruments Were Leaking.Valves Repaired & Power Range Instruments adjusted.W/891010 Ltr | |
| ML20024F684 | 31 August 1983 | LER 83-031/03L-0:on 830806,during Testing,Instrumentation Channel Associated W/Level Transmitter LT-474 Declared Inoperable.Caused by Setpoint Drift of Comparator Card.Card Adjusted & Instrumentation Channel Declared Operable | |
| ML20024F678 | 31 August 1983 | LER 83-042/03L-0:on 830802,post-LOCA Hydrogen Recombiner 1A Declared Inoperable.Caused by Failure of Temp Indicator.New Indicator Installed & Declared Operable | |
| ML20024D087 | 26 July 1983 | LER 83-038/03L-0:on 830627,during Turbine Driven Auxiliary Feedwater Pump Inservice Test,Pump Failed to Start from Train a Steam Supply & Declared Inoperable.Caused by Valve HV-3226 Failing to Stroke properly.W/830726 Ltr | Stroke time |
| ML20024C125 | 30 June 1983 | LER 83-027/03L-0:on 830607,during Performance of FNP-1-STP-43.0,train a Penetration Room Filtration Sys Declared Inoperable When Exhaust Fan Damper 3357A Would Not Open.Caused by Comparator Card failure.W/830630 Ltr | |
| ML20024C401 | 22 June 1983 | LER 83-025/03L-0:on 830528,during Calibr Procedure FNP-2-STP-612.0,reactor Coolant Pump 2A Undervoltage Relay 27-3 Declared Inoperable.Caused by Setpoint Drift.Relay Setpoint Adjusted | |
| ML20024C406 | 22 June 1983 | LER 83-024/03L-0:on 830525,following Increased Count Rate on Containment Atmosphere Particulate Monitoring Sys R-11, RCS Unidentified Leakage Found Above Tech Specs.Cause Not Stated.Loop B Drain Valve Tightened | |
| ML20023B582 | 29 April 1983 | LER 83-014/03L-0:on 830330,during Surveillance Test of Main Feedwater Pump Turbine 1A,RCS Tavg Decreased Below 541 F. Caused by Overfeeding of Steam Generators Due to Excessive Leak Past Main Feedwater Pump Discharge Valve | |
| ML20023B528 | 27 April 1983 | LER 83-015/03L-0:on 830328,instrumentation Channel Associated W/Steam Generator 1C Flow Transmitter FT-497 Declared Inoperable Due to Erroneous High Indication.Caused by Obstruction of Low Pressure Sensing Line.Line Cleared | |
| ML20023B532 | 27 April 1983 | LER 83-012/03L-0:on 830402,overtemp-delta Temp Loop 2 Channel II Declared Inoperable When Bistables 422C1-2 Tripped.Caused by Power Supply Failure of Comparator Card. Card Replaced & Loop Calibr | |
| ML20028G305 | 28 January 1983 | LER 82-062/03L-0:on 821231,noble Gas Activity Monitor R15 Declared Inoperable.Caused by Blown Fuse.Fuse Replaced & Monitor Returned to Svc | |
| ML20028G311 | 28 January 1983 | LER 83-001/03L-0:on 830102,RCS Subcooling Monitor Channel 2 Declared Inoperable Following Receipt of Main Control Board Alarms.Caused by Faulty Printed Circuit Card.Connector Pins on Card Cleaned | |
| ML20028G309 | 28 January 1983 | LER 82-063/03L-0:on 821230,B Train Chlorine Detector Declared Inoperable When Control Room Supply Damper Would Not Close.Caused by Faulty Solenoid Valve.Valve Replaced | |
| ML20027D917 | 5 November 1982 | LER 82-042/03L-0:on 821013,containment Auxiliary Personnel Hatch Failed to Meet Outer Door Acceptance Criteria.Caused by Worn Gaskets.Gaskets Replaced | |
| ML20027D345 | 26 October 1982 | LER 82-056/03L-0:on 820927,control Rod Bank D Declared Inoperable When Rods Would Not Move in Manual Control.Caused by Bank Select Relay Sticking,Causing Control Banks B & D to Be Selected Simultaneously.Relay Inspected & Reinstalled | |
| ML20027B749 | 21 September 1982 | LER 82-038/03L-0:on 820823,inboard & Outboard Pumps of Containment Atmosphere Monitors R-11 (Particulate Monitor) & R-12 (Gaseous Monitor) Declared Inoperable.Caused by Defective Relay & High Flow Switch.Relay & Switch Replaced | |
| ML20027B747 | 21 September 1982 | LER 82-036/03L-0:on 820824,2B Auxiliary Feedwater Pump Dc Control Power Breaker Inadvertently Opened.Caused by Personnel Error.Breaker Immediately Reclosed & Personnel Counseled | |
| ML20027B746 | 21 September 1982 | LER 82-051/03L-0:on 820823,1B Control Room Air Conditioner Failed,Rendering B Train Control Room Emergency Air Cleanup Sys Inoperable.Caused by Failed Fan Drive Belts.Belts Replaced & Sys Returned to Svc | |
| ML20027B745 | 21 September 1982 | LER 82-049/03L-0:on 820822,diesel Generator 1-2A Inadvertently Rendered Inoperable.Caused by Unauthorized Replacement of Lube Oil Strainers & Personnel Error. Generator Returned to Svc | |
| ML20052H654 | 30 April 1982 | LER 82-015/03L-0:on 820408,radiation Monitor 25A (Spent Fuel Storage Pool Area Gaseous activity-ventilation Sys Isolation) Declared Inoperable While Performing Test.Caused by Dirty Contacts on Mod Selector Switch.Contacts Cleaned | |
| ML20052H659 | 30 April 1982 | LER 82-017/03L-0:on 820413,FI-497 (Steam Generator 1C Feedwater Flow) Instrumentation Channel Declared Inoperable When Max Allowable Channel Check Error Was Exceeded.Caused by Faulty Transmitter Amplifier Card.Card Replaced | |
| ML20052C139 | 22 April 1982 | LER 82-014/03L-0:on 820326,28 & 0408,B Train Chlorine Detector Declared Inoperable Due to Detector Tape Not Advancing.Caused by Movement Indicator Binding Detector Tape & Sheared Pin in Tape Drive Mechanism | |
| ML20052C137 | 22 April 1982 | LER 82-014/03L-0:on 820328,while Performing Calibr & Functional Test,T average-low-low B Instrumentation Loop Declared Inoperable Due to Indicator Reading.Caused by Setpoint Drift.Power Supply Card Replaced | |
| ML20052C140 | 22 April 1982 | LER 82-015/03L-0:on 820325,radiation Monitor R29B Instrumentation Channel Declared Inoperable When Displays on All Readout Consoles Were Inaccurate.Caused by Dirty Contacts & Faulty Link.Contacts Cleaned | |
| ML20052C135 | 22 April 1982 | LER 82-012/03L-0:on 820326,during Routine Insp,Turbine Driven Auxiliary Feedwater Pump Declared Inoperable When Outboard Bearing Oil Bubbler Found Broken & Oil Drained. Possibly Caused by Workers Handling Scaffolding in Area | Scaffolding |
| ML20052A657 | 16 April 1982 | LER 82-013/03L-0:on 820317,containment Atmosphere Activity Monitors R-11 (Particulate Monitor) & R-12 (Gaseous Monitor) Declared Inoperable Due to Failure of Vacuum Pump.Caused by Failed Outboard Pump.Filter & Gasket Replaced | |
| ML20052A667 | 25 March 1982 | LER 82-009/03L-0:on 820228,instrumentation Loop Associated w/FT-474 (Steam Generator a Flow Transmitter) Declared Inoperable.Caused by Leaking Equalizing Valve.Valve Stem Repaired | |
| ML20052A661 | 25 March 1982 | LER 82-005/03L-0:on 820226,4160-volt B Train Ac Electrical Power Circuit Declared Inoperable When Emergency Bus 2G de-energized.Bus 2G de-energized When Breaker 2-DG15 Opened. Cause Under Investigation | |
| ML20052A671 | 25 March 1982 | LER 82-010/03L-0:on 820226,instrumentation Loop Associated w/LI-474 (Steam Generator a Level Indicator) Declared Inoperable.Caused by Loss of Necessary Level in Ref Leg While Steam Generator Not in Svc.Leg Refilled | |
| ML20052A663 | 25 March 1982 | LER 82-008/03L-0:on 820226,instrumentation Loop Associated w/LI-485 (Steam Generator B Level Indication) Declared Inoperable When Reading Was Out of Tolerance W/Other Channels.Caused by Obstruction in Ref Leg | |
| ML20050C186 | 19 March 1982 | LER 82-006/01T-0:on 820310,levels in Fire Protection Tanks a & B Fell to Approx 85,000 Gallons Each as Result of Inadvertent Actuation of Fire Protection Deluge Sys on Cooling Tower 1A.Caused by Personnel Error |