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| Issue date | Title | Topic | |
|---|---|---|---|
| ML20028C203 | 30 December 1982 | LER 82-168/03L-0:on 821201,steam Leak Discovered on Pressure Sensing Line for RCIC Instruments DPIS 1E31-N0007B & Ps 1E31-N022B&D.Caused by Failure of Compression Fitting on Instrumentation Steam Pressure Line.Leak Repaired | |
| ML20028C205 | 21 December 1982 | LER 82-160/03L-0:on 821124,while Running at 450 Mwt,Leak Detected on High Point Vent Line for Discharge Line from Condensate Booster Pump 1B.Cause Undetermined.Line Repaired | |
| ML20028C354 | 27 December 1982 | LER 82-163/03L-0:on 821129,temp Switches 1E31/N612A & B & Temp Differential Switches 1E31/N613A & B Found Out of Allowable Tolerance.Caused by Inconsistency in Procedure for Calibr Temp Switches.Procedure Revised & Switches Recalibr | |
| ML20028E702 | 19 January 1983 | LER 82-173/03L-0:on 821221,reactor Recirculation Coolant Sample Outboard Isolation Valve 1B33-F020 Failed to Close Upon Control Room Demand.Caused by Air Supply Solenoid Valve Sticking in Open Position.Solenoid Valve Cleaned | |
| ML20028E735 | 18 January 1983 | LER 82-172/03L-0:on 821220,loss of Div II Reactor Vessel Instrumentation Occurred.Caused by Leaky Fitting on Line 1NB56A-1/2.Fitting Tightened & Ref Leg Backfilled | |
| ML20028E995 | 18 January 1983 | LER 82-174/03L-0:on 821219,during Startup,Intermediate Range Monitor B Read Downscale.Caused by Disconnected High Voltage Cable.No Reason Known for Disconnected Cable.Personnel Will Be Trained on Use/Control of Degraded Equipment Log | |
| ML20042D392 | 4 January 1990 | LER 89-011-01:on 890826,spurious Reactor Protection Sys Actuation Occurred.Definite Cause of Trip Not Determined. Brief Disturbance in Reactor Protection Sys Allowed Some Contactors to Trip.Procedure revised.W/900104 Ltr | |
| ML20042F194 | 30 April 1990 | LER 89-025-01:on 891101,sys Auxiliary Transformer Feed to Bus 142Y Tripped Open When Door Containing Undervoltage Relays Closed.Caused by Misalignment of Door.Door Repaired. W/900430 Ltr | |
| ML20042F900 | 4 May 1990 | LER 90-005-00:on 900411,experienced Loss of Dc Power to Portion of Div I Primary Containment Isolation Sys Logic Which Resulted in Isolation Signal & Actuation.Caused by Failure to Update Drawings & procedures.W/900504 Ltr | |
| ML20042H021 | 10 May 1990 | LER 90-006-00:on 900412,loop a Primary Containment Chilled Water Sys Inboard Isolation Valves & Reactor Bldg Closed Cooling Water Sys Inboard Isolation Valve Went Closed.Caused by Inadequate Procedure.Procedures revised.W/900510 Ltr | |
| ML20043A772 | 18 May 1990 | LER 90-007-00:on 900421,reactor Protection Sys Bus a Transfer & Reactor Recirculation Hydraulic Power Unit a Inboard Isolation Valves Closed,Causing Partial Group II isolation.Out-of-svc Procedure revised.W/900518 Ltr | |
| ML20043B568 | 23 May 1990 | LER 89-027-01:on 891113,primary Containment Isolation Sys Group 1 Isolation Occurred During Surveillance Testing. Caused by Burnt Out Window Light Bulbs on Alarm Window. Light Bulbs Replaced & Jumpers installed.W/900523 Ltr | Reactor Vessel Water Level Half scram |
| ML20043D059 | 18 May 1990 | LER 90-008-00:on 900502,ESF Actuation of Control Room B Emergency Ctk Ventilation Makeup Fan Occurred.Caused by Procedure deficiency.LTS-800-205 & Similar Procedures Will Be revised.W/900601 Ltr | |
| ML20043F128 | 1 June 1990 | LER 90-009-00:on 900511,apparent Ruptured Diaphragm Found on Pressure Differential Switch in RCIC Steam Line.Caused by Torn Diaphragm Inside Switch.Replacement Switch Installed, Calibr & Functionally Tested satisfactorily.W/900608 Ltr | |
| ML20043F172 | 5 June 1990 | LER 90-009-00:on 900510,RWCU Outboard Suction Isolation Valve 2G33-F004 Auto Closed Which Tripped RWCU Pump B. Caused by Procedure Deficiency.Procedure LTS-500-209 Will Be revised.W/900605 Ltr | |
| ML20044A385 | 25 June 1990 | LER 90-008-00:on 900525,Tech Spec Hourly Fire Watch Missed Due to Miscommunications Between Security Personnel & Radiation Protection Personnel.Fire Watch re-established & Memo issued.W/900625 Ltr | High Radiation Area Fire Watch Hourly Fire Watch |
| ML20044B616 | 25 February 1993 | LER 93-002-00:on 930126,Unit 1 Manual Scram Due to a SRV Being Stuck Open Due to Duct Tape Being Over Actuators Air Valve Manifold Exhaust Port.Maint Procedures That Involve Cleanliness reviewed.W/930225 Ltr | |
| ML20044C980 | 7 May 1993 | LER 91-010-01:on 910719 & 0805,CR a Ventilation Emergency Makeup Fan auto-started on Spurious Trip of CR Air Intake Process Radiation Monitor.Caused by Normal Variations in Background Radiation.Supply Board replaced.W/930507 Ltr | |
| ML20044D516 | 15 May 1993 | LER 92-007-01:on 920613,high Radiation Spike Received from CR Ventilation Process Radiation Monitor,Initiating Emergency Makeup Train B.Caused by Normal Variations in Radiation Readings.Spike modified.W/930515 Ltr | |
| ML20044D557 | 14 May 1993 | LER 93-010-00:on 930414,DG Cooling Water Pump Automatically Tripped on Magnetic Overload.Caused by Inexperienced Trainee in Operation of Control Lever.Lesson Plans & Training Programs for Operators to Be reviewed.W/930514 Ltr | |
| ML20044E416 | 28 May 1993 | LER 92-009-01:on 920923,spurious Auto Start of CR Ventilation Emergency make-up Train Occurred Due to High Radiation Spike.Radiation Monitor Circuit modified.W/930528 Ltr | |
| ML20044E419 | 21 May 1993 | LER 93-011-00:on 930423,manual Scram Initiated.Caused by Disconnected Linkage on Valve Positioner on Heater Drain Valve Due to Loose Jam Nut.Tailgate Session Will Be Held W/ Instrument Maint Dept Re Jam nuts.W/930521 Ltr | Scram Discharge Volume |
| ML20045D750 | 23 June 1993 | LER 93-003-00:on 930524,Div 1 ECCS Initiation Signal Received & LPCS Pump,Lpci Pump 2A & EDG Unit 0 Automatically Started.Caused by Personnel Error.Pumps Secured & Event Documented in Personnel file.W/930623 Ltr | |
| ML20045D933 | 2 July 1993 | LER 93-004-00:on 930604,unexpected CRD Low Charging Water Header Scram Received Followed by Charging Water Header A2/B2 Alarm.Caused by Crud or Foreign Matl Passing Through Suction Filter.Filters Cleaned & reused.W/930702 | |
| ML20046B148 | 30 July 1993 | LER 93-012-00:on 930702,reactor Core Isolation Cooling Sys Declared Inoperable Due to Associated Bus Voltage Dropping Below TS Limits.Sent Operator to Cycle Timer Which Caused Affected Contact to reclose.W/930730 Ltr | Safe Shutdown |
| ML20052H227 | 7 May 1982 | LER 82-002/03L-0:on 820419,station Vent Stack Flow Recorder DFR-VR019 Read Downscale.Caused by Flow Transmitter Core Hung at Zero Point.Flow Transmitter Repaired |