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| Issue date | Title | Topic | |
|---|---|---|---|
| ML20029D037 | 26 April 1994 | LER 94-004-00:on 940324,found Five Slow Rods While Scram Time Testing Was Being Performed.Caused by Contamination of Internal Scram Solenoid Pilot Valve Head Assemblies. Corrective Action:Install New Head assemblies.W/940426 Ltr | |
| ML20046C399 | 6 August 1993 | LER 92-009-01:on 920509,observed That Some of Fuel Rod Compression Springs Compressed More than Expected for Assembly Exposure Achieved.Max Envelope Size of Lower Tie Plate Will Be reduced.W/930806 Ltr | |
| ML20045G791 | 8 July 1993 | LER 93-005-00:on 930608,indicated That Response Time Test for RCIC Low Steam Pressure Isolation Instrumentation Invalid.Caused by Inappropriate Test Method.Procedures Governing Method of Testing Will Be revised.W/930708 Ltr | Time of Discovery |
| ML20045E960 | 30 June 1993 | LER 92-017-02:on 920804,reactor Scrammed Due to Low Primary Water Tank Level Signal.Implemented Minor Change Package Which Will Install DC to DC Converter Between 24 Volt DC Power Supply & Pw Tank Level transmitters.W/930630 Ltr | Temporary Modification |
| ML20045C526 | 16 June 1993 | LER 93-004-00:on 930517,inboard Containment Isolation Valve Which Supplies Steam to RCIC Sys Automatically Isolated Due to Topaz Inverter Failure.Calibr Instructions & PM Program Will Be reviewed.W/930616 Ltr | |
| ML20045A015 | 28 May 1993 | LER 92-011-02:on 920608,determined That Design Inadequacies Could Result in Exceeding 10CFR100 Limits.Caused by Failure of Original Design to Specify leak-tight Const for Fan Housing.Shaft Seal Design installed.W/930528 Ltr | |
| ML20024G970 | 6 May 1991 | LER 91-002-00:on 910406,operating Module Breaker in Automatic Turbine Tester Circuitry Tripped Open,Deenergizing Control Solenoid for change-over Valve.Caused by Use of Undersized Circuit Breaker.Module replaced.W/910506 Ltr | |
| ML20029A333 | 13 February 1991 | LER 91-001-00:on 910114,Tech Spec Limiting Condition of Operation Action Was Not Satisfied After DG Removed from Standby Svc to Perform Preventive Maint.Caused by Personnel Error.Procedure Changed to Prevent recurrence.W/910213 Ltr | Missed surveillance |
| ML20044A688 | 25 June 1990 | LER 90-009-00:on 900526,nonlicensed Personnel Performed Step Out of Sequence During Breaker rack-out & Caused LPCS Pump Breaker to Close.Operator Involved Counseled on Failure to Adhere to Breaker Operation procedure.W/900625 Ltr | |
| ML20043H295 | 15 June 1990 | LER 90-007-00:on 900516,discovered That Actions Taken for Inoperable Reactor Water Level Transmitter Not Adequate to Comply W/Requirements for Tech Spec 3.3.2.Caused by Personnel Error.Meetings Held w/personnel.W/900615 Ltr | |
| ML20043C674 | 1 June 1990 | LER 90-006-00:on 900502,review of Effluent Sample Analysis Revealed That Turbine Bldg Ventilation Exhaust Had Not Been Analyzed Exceeding Time Limit.Caused by Personnel Error. Training & Counseling conducted.W/900601 Ltr | |
| ML20042F225 | 4 May 1990 | LER 90-005-00:on 900406,discovered That Current Surveillance Practices for Stroke Testing Fresh Air Makeup Intake Valves Could Have Resulted in Unfiltered Pathway.Administrative Controls Placed on valves.W/900504 Ltr | Stroke time |
| ML20012D807 | 22 March 1990 | LER 89-018-01:on 891215,determined That Inappropriate Quality Level Designations Applied to Class 1E Circuits, in Violation of Reg Guide 1.75.Caused by Discrepant Instrument Index Controls.Handswitch replaced.W/900228 Ltr | Earthquake |
| ML20012D480 | 16 March 1990 | LER 90-003-00:on 900215,identified Potential Single Failure Scenario That Could Result in Unavailability of Both Core Spray Sys for Long Term post-LOCA Core Cooling.Detailed Heatup Evaluation Performed for Power bundle.W/900316 Ltr | |
| ML20012A166 | 28 February 1990 | LER 90-002-00:on 900124,discovered That Div II Solenoid Associated W/Secondary Containment Isolation Valve Did Not Operate During Quarterly Valve Stroke Time Tests.Caused by Procedure Inadequacy.Procedures changed.W/900227 Ltr | Stroke time |
| ML20006E452 | 15 February 1990 | LER 89-015-01:on 891030,no Data or Evidence Found That Stroke Time Test Performed on Bettis Actuator for Isolation Damper Following Maint.Caused by Programmatic Weaknesses.New Computer Field Data Added to Work orders.W/900215 Ltr | Time of Discovery Stroke time |
| ML20006E046 | 9 February 1990 | LER 90-001-00:on 900112,determined That Tech Spec Reactor Coolant Cooldown Rate Limit of 100 Degrees F Exceeded in Reactor Bottom Head Drain Pipe.Caused by Programmatic Deficiencies.Incident Rept Form improved.W/900209 Ltr | Time of Discovery |
| ML20006B873 | 29 January 1990 | LER 89-019-00:on 891230,total Loss of Plant Svc Water Experienced Due to Loss of Power to Supply Wells.Caused by Malfunction of Microwave Info & Control Sys.Periodic Microwave Operational Checks established.W/900129 Ltr | |
| ML20006B278 | 16 January 1990 | LER 89-017-00:on 890718,determined That Isolation for Postulated RWCU Blowdown Line Breaks in Piping Cold Rooms Was 80 S,Causing Plant to Operate in Unanalyzed Condition. Tech Spec Change Request Will Be submitted.W/900116 Ltr | Unanalyzed Condition |
| ML20005G212 | 12 January 1990 | LER 89-007-01:on 890508,RWCU Sys Isolated on Leak Detection Differential Flow Signal While Shifting RWCU Operation from pre-pump to post-pump Mode.Probably Caused by Inadequate Reactor Pressure.Procedure revised.W/900112 Ltr | |
| ML20005G207 | 12 January 1990 | LER 89-018-00:on 891215,design Basis Review of Instrumentation Determined That 71 Devices,Classified as nonsafety-related,contained in Class 1E Circuits.Caused by Level of Control on Instrument index.W/900112 Ltr | |
| ML20005D741 | 6 December 1989 | LER 89-016-00:on 891107,during Severe Thunderstorm,Lightning Struck Site,Causing Scram & HPCS Low Water Level Channels to Trip.Design Change Package Issued to Install Lightning Dissipation Sys on Vulnerable structures.W/891206 Ltr | |
| ML19332F073 | 29 November 1989 | LER 89-015-00:on 891030,no Data or Evidence Found for Stroke Time Test Required to Be Performed Following Maint on Bettis Actuator for Isolation Damper QSZ51F001.Caused by Personnel Error.Programmatic Enhancements initiated.W/891129 Ltr | Time of Discovery Stroke time |
| ML19325E697 | 31 October 1989 | LER 89-008-02:on 890523,two Redundant Secondary Containment Isolation Dampers Failed to Close within 4 Time Limit of Tech Spec 3.6.6.2.Caused by Malfunction of Exhaust Valves. Exhaust Valve replaced.W/891031 Ltr | Stroke time |
| ML19325E633 | 27 October 1989 | LER 89-014-00:on 890929,RWCU Sys Isolated on Simulated Steam Line Tunnel High Temp Signal.Caused by Operator Failure to Perform self-verification Prior to Moving Bypass Switch. General Manager Held Briefings w/personnel.W/891027 Ltr | |
| ML20024F456 | 31 August 1983 | Updated LER 83-001/01X-2:on 830107,electrician Preparing to Route Cable Noticed Two Wall Penetrations Had Been Opened. Because Control Room Not Notified of Work,No Fire Watch in Effect.Caused by Personnel error.W/830831 Ltr | Fire Watch Hourly Fire Watch |
| ML20024E874 | 31 August 1983 | LER 83-108/01T-0:on 830817,radiation Monitor B Trip Setpoint Found High & Grab Samples & Analyses Started Late.Caused by Personnel Error.Personnel counseled.W/830831 Ltr | Grab sample |
| ML20024E911 | 30 August 1983 | Updated LER 83-097/03X-1:on 830720,reactor Water Cleanup Auto Isolation Occurred.Caused by Delta Temp Channel B Indicating Temp Above Trip Point Limit.Investigation continuing.W/830830 Ltr | |
| ML20024F509 | 29 August 1983 | LER 83-112/03L-0:on 830730,while Troubleshooting Initiation Circuitry to Find Reason for Improper Operation of E12F087B & F025B,partial LOCA Signal Occurred.Caused by Error in Work Order.Administrative Fix underway.W/830829 Ltr | |
| ML20024F209 | 29 August 1983 | LER 83-111/03L-0:on 830730,during Performance of Work Order to Correct Malfunction W/Div I Isolation Reset Status lights,amphenol-type Signal Cable Connector in C/R Panel Disconnected.Caused by Personnel error.W/830829 Ltr | |
| ML20024E931 | 29 August 1983 | Updated LER 83-002/01X-1:on 830114,personnel Discovered Heat Detectors in Control Room Standby Fresh Air Sys Not Functionally Tested.Caused by Lack of Proper Procedure. Procedure rewritten.W/830829 Ltr | Missed surveillance Fire Watch Hourly Fire Watch |
| ML20024F613 | 29 August 1983 | Updated LER 83-010/99X-2:on 830105,fire Protection Deficiencies on Redundant Raceways/Cables Discovered in Auxiliary,Turbine & Control Bldgs.Caused by Incomplete Const.Maint Work Now complete.W/830829 Ltr | |
| ML20024F607 | 29 August 1983 | Updated LER 82-050/99X-1:on 820806,Fire Detection Zone 2-10 Went Into Alarm Condition & Would Not Clear.Caused by Diesel Exhaust Fumes Drifting Into Corridor.Detectors Cleaned. Design Change submitted.W/830829 Ltr | Fire Watch |
| ML20024D878 | 29 July 1983 | LER 83-078/03L-0:on 830701,control Room Operators Unable to Maintain Air Receiver Pressure for Diesel Generator 11. Caused by Setpoint Drift on Relief Valves for diesel-driven & Electric motor-driven Air compressors.W/830729 Ltr | |
| ML20024D089 | 25 July 1983 | LER 83-079/03L-0:on 830625,auxiliary Trip Unit for High Drywell Pressure Indicated Trip Condition Yet No Reactor Protection Sys Trip Occurred.Caused by Defective Rosemount Auxiliary Trip Unit.Trip Unit replaced.W/830725 Ltr | |
| ML20024D076 | 25 July 1983 | LER 83-080/03L-0:on 830626,control Room Operators Experienced Problems W/Hvac Sys Involving Inadequate Cooling Capacity & Sys Losses.Partially Caused by Malfunctioning Condenser Cooling Water Flow Control valve.W/830725 Ltr | |
| ML20024B994 | 29 June 1983 | LER 83-072/01T-0:on 830615,operations Shift Supervisor Discovered Some Continuous Fire Watches Not Performed on 830614.Caused by Personnel Error.Personnel Reinstructed Not to Pull Fire Watch W/O approval.W/830629 Ltr | Continuous fire watch Fire Watch |
| ML20024C403 | 27 June 1983 | LER 83-071/03L-0:on 830607,RHR Shutdown Cooling Mode Isolated When Valve E12-F009 Closed.Caused by Blown Fuse. Fuse replaced.W/830627 Ltr | |
| ML20024B998 | 24 June 1983 | LER 83-070/03L-0:on 830525,reactor Water Cleanup Sys Isolated When Standby Liquid Control Pump B Breaker Closed. Caused by Personnel Error.Isolation Signal reset.W/830624 Ltr | |
| ML20024C312 | 22 June 1983 | LER 83-069/03L-0:on 830523,during Attempt to Reenergize Div II Motor Operated Valves,Shutdown Cooling Mode of RHR Sys & Reactor Water Cleanup Sys Isolated.Caused by Failure to Install Power Fuses.Fuses installed.W/830622 Ltr | |
| ML20023E044 | 27 May 1983 | Updated LER 83-058/01X-1:on 830311,discovered That Fire Watches Not Conducted in Two Areas of Fire Detection Zone 2-19.Limiting Conditions for Operation Entered on 830227. Caused by Personnel Oversight.Zone restored.W/830527 Ltr | Fire Watch Hourly Fire Watch |
| ML20023D433 | 12 May 1983 | LER 83-046/03L-0:on 830412,monthly Functional Surveillance for Div I Chlorine Detection Sys Not Performed by 830410. Caused by Personnel Error | |
| ML20023D477 | 11 May 1983 | LER 83-052/03L-0:on 830411,while Reviewing Vessel Head Installation Work Package,Discovered Head Flange/Vessel Flange Thermocouples Not Physically Reinstalled During Insulation Installation.Cause Under Evaluation | |
| ML20023C559 | 9 May 1983 | Updated LER 83-031/99X-1:on 830113,fire Rated Door OC104 Blocked Open to Route Temporary Discharge Hose from Hot Machine Shop Sump to Turbine Bldg Floor Drain Sys.Caused by Inadequacy of Present Sys.Mod to Be Completed by Sept 1983 | |
| ML20023D251 | 9 May 1983 | LER 83-049/03L-0:on 830409,during Cold Shutdown,Diesel Generator 12 Auto Start Not Available When Alarm Actuated. Caused by Condensate Drain Valve Downstream of Tank C Not Fully Closed.Compressors Reworked | |
| ML20023C561 | 9 May 1983 | Updated LER 83-004/01T-1:on 830110,penetration AP-72B Found Open & Had Been Open Since 821213.Caused by Planned Maint Work & Personnel Error.Hourly Fire Watch Established. Penetration to Be Resealed by 830630 | Fire Watch Hourly Fire Watch |
| ML20023C551 | 9 May 1983 | LER 83-048/01T-0:on 830423,suppression Pool Level Instrumentation Discovered Not Functionally Tested Since 830409.Cause Under Investigation.Instrumentation Tested Satisfactorily within 8 H | |
| ML20023B554 | 28 April 1983 | LER 83-060/03L-0:on 830329,during Cold Shutdown,Load Shedding & Div I LSS Sequencing Panel Failure Alarm Actuated.Caused by Failure of 15-volt Dc Power Supply Used to Power Solid State Electronics for Sys Logic | |
| ML20023B673 | 27 April 1983 | LER 83-061/03L-0:on 830328,one Solenoid Operated Freon Valve Found W/Blown Gasket.Caused by Defective Alco Controls Solenoid Operated Gasket.Valve Reworked W/Valve Repair Kit & New Gasket Installed | |
| ML20028G603 | 11 February 1983 | LER 83-019/03L-0:on 830112 & 20,one Smoke Detector in Zone 1-15 & Eight Detectors in Zone 2-18 Covered During Planned Maint Functions to Prevent False Alarms or Damage to Unit. Detectors Uncovered After Maint Completed |