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| Issue date | Title | Topic | |
|---|---|---|---|
| ML17352B251 | 1 October 1993 | LER 93-019-00:on 930903,RHR Pump 1A Inadvertently Started Due to Personnel Error.Pump Immediately Secured & Individual Involved Counselled on Importance of self-check.W/931001 Ltr | |
| ML18041A125 | 14 September 1984 | Rev 4 to, 180-Day Rept in Response to IE Bulletin 80-11 for Dresden Nuclear Power Station Units 2 & 3. | Safe Shutdown Safe Shutdown Earthquake Probabilistic Risk Assessment Operating Basis Earthquake Tornado Generated Missile Earthquake |
| ML18052B554 | 24 August 1987 | LER 87-015-00:on 870731,capacitor Failed on 1B Reactor Bldg & Refuel Floor Radiation Monitors Resulting in Safety Feature Actuation.Caused by Normal Aging.Capacitor replaced.W/870825 Ltr | |
| ML19207B140 | 6 August 1979 | Monthly Operating Rept for Jul 1979 | |
| ML19208A045 | 21 August 1979 | LER 79-016/03L-0:on 790815,HPCI Turbine Area Temp Switch Found to Trip Above Tech Spec Limits.Caused by Setpoint Drift.Switch Replaced & Tested Satisfactorily | |
| ML19208A112 | 10 August 1979 | LER 79-024/03L-0:on 790724,pressure Suppression Chamber Reactor Bldg Vacuum Breaker Pressure Switch Was Found to Actuate Below Limiting Condition for Operation Level.Caused by Instrument Setpoint Drift.Switch Recalibr | |
| ML19208A821 | 10 September 1979 | Monthly Operating Rept for Aug 1979 | |
| ML19209B582 | 21 September 1979 | LER 79-017/03L-0:on 790822,during Monthly Surveillance, Division 1 Alarm on Vacuum Breaker Failed to Annunciate Upon Valve Opening.Caused by Limit Switch Problem.Vacuum Breaker Limit Switches Will Be Inspected During Outage | |
| ML19209C429 | 25 September 1979 | LER 79-018/03L-0:on 790905,spray Valve Mo 2-1001-23B Found to Trip Breaker When Operated.Caused by Broken Bolt in Valve Motor Operator.All Four Bolts on Motor Operator Replaced | |
| ML19209C611 | 2 October 1979 | Monthly Operating Repts for Sept 1979 | |
| ML19209D080 | 9 October 1979 | LER 79-019/03L-0:on 790910,reactor Bldg Vent Monitor Failed Downscale.Caused by Two Blown Fuses in Monitor Circuitry & Two Failed Capacitors in Monitor Power Supply.New Capacitors Installed & Fuses Replaced | |
| ML19210C666 | 6 November 1979 | LER 79-032/01T-0:on 791026,piping Restraints 1/2-7504-164 & 165 Had Safety Factor of Less than Two.Standby Gas Treatment Sys a & B Declared Inoperable.Caused by Improper Design of Safety Factors.Restraints Modified | Design basis earthquake |
| ML19210C670 | 1 November 1979 | LER 79-030/03L-0:on 791012,GEB-type Fuel Exposures Exceeded Max Averge Planner Linear heat-generation Rate.Caused by Failure to Specify Limits for High Exposure GEB-type Fuel. Curves Extended to Exposure Limit | |
| ML19210C684 | 1 November 1979 | LER 79-033/01T-0:on 791020,piping Restraint 1/2-7509-R149 Had Safety Factor of Less than Two.Standby Gas Treatment Sys a & B Declared Inoperable.Caused by Improper Design Safety Factors.Restraint Modified | |
| ML19220D048 | 4 May 1979 | LER 79-020/03L-0 on 790413:measured Leakage for Personnel Air Lock Was 54.63 Std Cubic Ft/H.Leakage Identified Through Outer Lower Handwell.Shaft Packing Was Replaced & Air Lock Retested | |
| ML19225B230 | 30 June 1979 | Monthly Operating Rept for June 1979 | |
| ML19225B515 | 22 June 1979 | LER 79-012/03L-0 on 790622:nut Inadvertantly Droppoed Into Diesel Generator Winding During Preventive Maint.Outage Time of Generator Extended 20 Minutes Beyond 1.5-h Time Limit. Caused by Personnel Error | |
| ML19241A931 | 27 June 1979 | LER 79-021/03L-0 on 790601:drywell-to-suppression Chamber Vacuum Breaker Div 11 Alarm Sys Breaker Found Tripped on 790410 & Reported as non-reportable.Should Be Reclassified. Cause of Breaker Trip Unknown | |
| ML19241A950 | 20 June 1979 | LER 79-020/03L-0 on 790525:quarterly MSIV Closure Timing Surveillance Performed & MSIV Closed in 6-s Instead of 5-s. Caused by Varied Speed Control Valve Adjustment on Hydraulic Cylinder | |
| ML19242D210 | 30 July 1979 | LER 79-023/03L-0 on 790717:high Pressure Switch in Safety Relief Valve Controller Found Inoperable During Reactor High Pressure Automatic Blowdown Functional test,QIS-40.Caused by Loosened Lead Wire from Switch to Terminal | |
| ML19246C473 | 5 July 1979 | LER 79-011/03L-1 on 790521:investigation of Cable Pans Found Three Cables Not Installed Per Tabulation Drawings.Caused by Error in Cable Routing Made During Metal Const.Cables to Be Rerouted During Nov 1979 Refueling Outage | |
| ML19246C484 | 13 July 1979 | LER 79-022/03L-0 on 790622:after Returning Unit 1 Diesel Generator to Svc,Following Monthly Preventive Maint Insp, Fuel Line Leak Was Discovered.Caused by Worn Gasket on Fuel Line Filter.Filter Gasket Replaced | |
| ML19248C590 | 22 June 1979 | LER 79-037/03L-0 on 790530:after Operator Closed Bus 24-1 Auxiliary Cabinet Door,Diesel Generator Differential Fault Alarmed,Resulting in Trip to Faul Relay W/Target Up.Caused by Closing Auxiliary Door Excessively Hard | |
| ML19250B829 | 16 October 1979 | LER 79-028/03L-0:on 790924,during Monthly Procedure Qos 1100-1,required 1,275 Psig Discharge Pressure Could Not Be Achieved on Subsys A.Caused by Setpoint Drift on RV-1-1105A.Valve Replaced & Subsys Returned to Svc | |
| ML19250B961 | 8 October 1979 | LER 79-026/03L-0:on 790914,during Reactor Shutdown,Outboard MSIV A0-1-203-2C Would Not Fully Close.Caused by Sticking Air Pilot Valve.Pilot Disassembled,Inspected & Replaced. MSIV Stroked & Timed to Close in 3.9-s | |
| ML19250B999 | 31 December 1978 | Load Line Limit Analysis License Amend Submittal. | |
| ML19253A918 | 21 August 1979 | LER 79-025/03L-0:on 790813,while Performing Hpic Turbine Area High Temp Isolation Calibr,Temp Switch TS 1-2371A Was Found to Trip at 203 F.Caused by Setpoint Drift. Switch Was Recalibr & Successfully Retested | |
| ML19253C317 | 14 November 1979 | LER 79-023/03L-0:on 791016,level Switch LIS 2-263-72A Failed to Trip During Calibr.Caused by Failure of One Mercury Wetted Magnetic Switch Encl in Level Indicator.New Switch Installed & Tested Satisfactorily | |
| ML19253C328 | 14 November 1979 | LER 79-024/03L-0:on 791025,vacuum Breaker AO 2-1601-20B Failed to Open During Calibr & Functional Test.Caused by Component Failure.Solenoid Valve 2-1601-50B Rebuilt 791025 | |
| ML19253C333 | 16 November 1979 | LER 79-026/03L-0:on 791022,during Turbine First Stage Low Pressure Calibr Procedure Qis 55-1,pressure Switch PS-2-504C Tripped Above Tech Spec Limit.Caused by Instrument Set Point Drift.Pressure Switch Recalibr | |
| ML19253C347 | 21 November 1979 | LER 79-025/03L-0:on 791026,during Lcpi Motor Operated Valve Operability Test,Motor Control Breaker Tripped on Thermal Overload.Caused by Tripping Circuit Breaker.Motor Meggared | |
| ML19254D826 | 23 October 1979 | LER 79-056/03L-0:on 791004,fuses for Normal & Reserve Power to Relief Valve Blew,Rendering Relief Valve Inoperable. Caused by Socket Shorting While Changing Closed Indication Light Bulb for 2-D Electromatic Relief Valve | |
| ML19254E984 | 19 October 1979 | LER 79-027/03L-0:on 790921,Tech Specs Exceeded for Water Reactor Conductivity & Chloride Concentration.Caused by Personnel Error.All Personnel Informed of Importance of Knowing Surveillance Limits | |
| ML19254F018 | 15 October 1979 | LER 79-020/03L-0:on 790919,three Grinnell Hydraulic Snubbers Found to Have Empty Reservoirs.Caused by Excess Leakage Through Defective Gaskets.Snubbers Repaired by Installing New Oil Resevoirs and Seals | |
| ML19254F278 | 26 October 1979 | LER 79-029/03L-0:on 790929,false High Radiation Signal Automatically Started Reactor Bldg Ventilation Sys & Standby Gas Treatment Sys.Caused by Burned Coil on Relay 1-1705-101. Relay Coil Replaced | |
| ML19254F893 | 6 November 1979 | LER 79-033/03L-0:on 791025,while Performing Diesel Generator Monthly Load Test,Unit 1/2 Diesel Generator Failed to Accept Full Rated Load of 2,500 Kw.Caused by Plugged Oil Filter. Filters Replaced & Governors Adjusted | |
| ML19256A131 | 24 October 1978 | LER 78-054/03L-0:on 780930 Torus Vacuum Relief Valve AO-1601-20B Would Not Close.Alarm Received.Valve Fully Open. Caused by Blown Fuse in Control Circuit Due to Short in AO-1601-203 Air Operated Solenoid Valve | |
| ML19256B185 | 17 January 1979 | LER 79-002/01T-0 on 790103:HPCI Turbine Failed to Start During Quarterly Flow Test.Caused by Misadjustment of the Interlock Dump Valve Operating Lever | |
| ML19256E505 | 25 October 1979 | LER 79-022/03L-0:on 791005,vacuum Breaker AO 2-1601-32B Failed to Give Full Open Red Light Indication.Caused by Valve Position Indicating Switch Problem.Corrective Actions to Be Completed During Nov 1979 Refueling Outage | |
| ML19256F253 | 30 November 1979 | LER 79-035/03L-0:on 791109,RHR Svc Water Line Supports Found W/Safety Factor Less than Two.Containment Cooling Loop Declared Inoperable.Caused by Design Deficiency.Supports Modified for Factor Above Four,Loop Returned to Svc | |
| ML19256G026 | 21 December 1979 | LER 79-064/03L-0:on 791124,torus-to-drywell Vacuum Breaker Found Inoperable.Caused by Swollen Teflon Shaft Bushings. Bushings Machined to Required Clearance & Study Initiated Re Applicability of Teflon as Bushing Material | |
| ML19257A717 | 7 December 1979 | LER 79-036/03L-0:on 791115,during in-place Freon Test on 1/2-B-7509 Standby Gas Treatment Sys,Freon Penetration Through Charcoal Absorbers Was 1.05%.Caused by Faulty Compressing of Internal Gaskets.New Gaskets Installed | |
| ML19257A722 | 24 December 1979 | LER 79-027/03L-0:on 791126,six Occurrences Identified Whereby Excessive Leakages Were Measured W/Respect to Primary Containment Isolation Valves During Local Leak Rate Testing.All Valves to Be Repaired & Tested | |
| ML19257A727 | 11 December 1979 | LER 79-037/03L-0:on 791116,diesel Generator Starting Air Supply Valves 1/2-4699-121 Locked in Closed Position.Caused by Operator Error.Generator Not Rendered Inoperable Due to Redundant Valve.Valve Opened & Locked | |
| ML19257A728 | 10 December 1979 | LER 79-038/01T-0:on 791128,scram & ECCS Initiation Setpoints Set Lower than Required by Tech Specs.Caused by Initial Instrument Ref Leg Calculations Based on Temp of 135 F. Indicating Switches Recalibr | Reactor Vessel Water Level |
| ML19257B197 | 3 January 1980 | Monthly Operating Repts for Dec 1979 | |
| ML19257B273 | 4 January 1980 | LER 79-042/03L-0:on 791214,while Performing MSIV Closure Timing Surveillance,Ao 1-203-1C Found to Close in 5.2-s. Caused by Varied Speed Control Valve Adjustment on Hydraulic Control Cylinder.Valve Adjusted | |
| ML19257B388 | 31 December 1979 | LER 79-028/03L-0:on 791205,while Performing Reactor Core Isolation Cooling Turbine Area High Temp Calibr,Four Temp Switches Tripped in Excess of Tech Spec Limit.Caused by Instrument Setpoint Drift.Switches Recalibr | |
| ML19257B412 | 2 January 1980 | LER 79-029/03L-0:on 791206,prior to Performing Leak Test, Primary Containment Oxygen Analyzer Return Isolation Valve AO 2-8803 Would Not Fully Close.Caused by Binding of Valve Stem & Valve Packing.Valve Removed & Repacked | |
| ML19257C617 | 21 January 1980 | LER 79-030/03L-0:on 791228,while Performing Surveillance Procedure Qos 30-2,bed Plate Drain Valve AO 2-4999-59 Failed to Close When Float Switch Was Activated.Caused by Component Failure.Corrective Maint Underway |