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| Issue date | Title | Topic | |
|---|---|---|---|
| 05000278/LER-1993-004 | 30 August 1993 | LER 93-004-00:on 930730,simulated Low Steam Flow Signal to Recombiner Initiated Isolation Signal to Off Gas Recombiner, Causing Main Condenser Vacuum to Begin Decreasing.Special Procedure SP-1438 revised.W/930830 Ltr | |
| 05000278/LER-1993-005 | 3 September 1993 | LER 93-005-00:on 930809,HPCI Sys Declared Inoperable Due to Defective Flow Controller.Flow Controller Removed,All Potentiometers & Boards Cleaned,Flow Controller Reinstalled & Necessary Testing & Tuning performed.W/930903 Ltr | |
| 05000278/LER-1993-006 | 3 September 1993 | LER 93-006-00:on 930814,LPCI Sys Became Inoperable When Triple Low Water Level Signal Simulated on Unit 2.RWL Instrumentation LT-72B Valved Out of Svc & Equalized Allowing Indicated Water Level to increase.W/930903 Ltr | |
| IA-87-439, Partially Withheld Secy Rept Re 861020 Order Issued by IE to Licensee to Show Cause Why Operating License Should Not Be Modified to Prohibit Use of Radios,Tapes & Other Entertainment Devices in Plant Control Rooms | 28 January 1987 | Partially Withheld Secy Rept Re 861020 Order Issued by IE to Licensee to Show Cause Why Operating License Should Not Be Modified to Prohibit Use of Radios,Tapes & Other Entertainment Devices in Plant Control Rooms | |
| LD-97-031, Part 21 Rept Re Incorrect Nut & Washer Plate Matl for ECCS Suction Strainer Bolted Connections.Nut Plates & Washer Plates Fabricated from Incorrect Matl & Delivered to Peach Bottom Unit 3 Site.Nut & Washer Plates Never Installed | 30 October 1997 | Part 21 Rept Re Incorrect Nut & Washer Plate Matl for ECCS Suction Strainer Bolted Connections.Nut Plates & Washer Plates Fabricated from Incorrect Matl & Delivered to Peach Bottom Unit 3 Site.Nut & Washer Plates Never Installed | |
| ML112760113 | 29 December 1978 | LER 78-030/01T-0 on 781218:during surveillance,MO-2-64A Recirculation Loop 11 Discharge Bypass Valve Would Not Close.Cause Is Unknown Due to Inaccessibility of Valve | |
| ML112760118 | 29 January 1979 | LER 78-016/03X-1 on 780908:during Normal Operation,Trip of Essential MCC B33A Supply Breaker 52-304 Resulted in Operation in Degraded Mode.Caused by Low Setpoint on Trip Device & by Loss of Dash Pot Oil in Trip Device | |
| ML112760120 | 2 February 1979 | LER 79-001/03L-0 on 790110:during Normal Operation,Steam Leak Found in Elbow on Turbine Main Steam Bypass Header 1 Inch Drain Line to Condenser,Due to Erosion Caused by Steam & Water Flow of Restricting orifice,RO-2569 | |
| ML112760138 | 15 December 1978 | LER#78-022/03L-0 on 781117:steam Leak Was Discovered in a 1 Wye Strainer,YS-4002,on the Main Steam Equalizer Drain Line. Leak Caused by a Defective Casting & Dev After Two Days of Svc | |
| ML112760140 | 14 December 1978 | LER#78-021/03L-0 on 781114:during Refueling Outage While Testing RHR SW Sys,A Pinhole Leak Was Discovered in CV-1729, RHR SW Differential Pressure Control Valve.Caused by Corrosion & Erosion of Upper Valve Body | |
| ML112760143 | 19 December 1978 | LER#78-028/03L-0 on 781124:during Normal Oper,Small Steam Leak Was Discovered in Weld of 45 Degree Elbow on HPCI Steam Supply Line 1 Inch Drain Line to Main Condenser Due to Corrrosion.Weld Repair Made at Leak.Awaiting Parts | |
| ML112760148 | 9 February 1979 | LER 79-002/03L-0 on 790118:during Normal Operation,Weekly Average Power Range Monitor Functional Scram Test Was Not Completed within Time Allowed.Caused by Personnel Error | |
| ML112780151 | 15 March 1979 | LER 79-003/01T-0 on 790301:containment Vent & Purge Isolation Valves Would Not Close During DBA-LOCA.Cause Unknown.Fisher Continential 18 & 20 Inch,Type 9220 Butterfly Valves Opening Is Administratively Controlled | |
| ML112900662 | 14 March 1980 | LER 80-007/01T-0:on 800303,during Refuel Shutdown,Cable Routing for HPCI & Automatic Depressurization Sys Cables Identified Lack of Physical Separation Between Automatic Depressurization Sys Cables & Ones for Div of HPCI Sensors | |
| ML112900665 | 21 March 1980 | LER 80-013/01T-0:on 800309,during Refueling Operations,Rod Withdrawn Block Not Received When Refueling Bridge Traversed Core.Caused by Actuating Arm Out of Adjustment.Components Readjusted & Interlocks Tested Prior to Refueling | |
| ML112900668 | 20 March 1980 | LER 80-011/01T-0:on 800306,during Refueling Outage,Repairs to Outboard MSIV Stop Valve Revealed Flow Path Between Secondary Containment & Turbine Bldg When MSIV Poppet Was Pulled.Caused by Lack of Preventive Procedure Controls | |
| ML112900678 | 26 March 1980 | LER 80-006/03L-0:on 800226,during Refueling Outage,Seven of Main Steam Line Area Temp Switches Found to Trip Above Required Level.Caused by Setpoint Drift.Switches Recalibr | |
| ML112900680 | 27 March 1980 | LER 80-015/01T-0:on 800317,during Refueling Outage & Insp Required by IE Bulletin 79-01B,unqualified Splices Found in Power Cables for Inboard MSIV Solenoid Valves.Cause Not Stated.Splices Replaced W/Qualified Matls | |
| ML112900685 | 10 April 1980 | LER 80-016/01T-0:on 800327,during Refueling,Supports for SRV Pneumatic Supply Sys Would Not Meet Seismic Class I Requirements.Caused by Inadequate Design & Installation of Sys.Sys Was Upgraded to Satisfy Requirements | |
| ML112900707 | 11 April 1980 | LER 80-017/01T-0:on 800328,Bechtel Power Corp Notified Util That Control Rod Driveline Hydraulic Piping Frame Supports Would Not Meet OBE Stress Limits.Caused by Eds Computer Code Error.Supports Modified | |
| ML112900722 | 9 May 1980 | LER 80-018/03L-0:on 800411,during Routine Operator Insp, Attachment Weld of Ripple to Level Switch Float Chamber Assembly on Moisture Separator Level Switch LS-1188 Found Cracked.Caused by Improper Weld Procedure | |
| ML112900745 | 27 May 1980 | LER 80-020/03L-0:on 800427,during post-maint Startup of Reactor Recirculation Sys,Inaccessible Recirculation Valve Motor Failed.Cause Not Stated.Motor Is Limitorque Type SMB-2 W/Magnetic Brake | |
| ML112900748 | 2 June 1980 | Updated 79-015/03L-1:on 790712,during Routine Insp,Steam Leak from 13A Intermediate Pressure Feedwater Heater Was Detected.Insulation Removal Revealed through-wall Flaw in Heater Shell.Caused by erosion-corrosion | |
| ML112900751 | 12 June 1980 | LER 80-021/03L-0:on 800515,during Normal Startup,Reactor Core Isolation Cooling Control Power Fuse Opened.Caused by Shorted Relay Coil in Circuit Due to Ac Relay Inadvertently Installed by Maint Personnel.Relay Replaced | |
| ML112900754 | 26 June 1980 | LER 80-022/03L-0:on 800529,primary Containment Oxygen Concentration Exceeded 5% by Weight Tech Spec Limit.Caused by Open Svc Air Isolation Valve to Drywell.Procedures Have Been Revised to Assure Proper Valve Positioning | |
| ML112900760 | 1 July 1980 | LER 80-023/03L-0:on 800601,air Ejector Offgas Radiation Monitors Dropped to About 20% Normal for About 40 Minutes. Caused by Mechanical Vacuum Pump Offgas Sample Valve Being Incorrectly Opened.Valve Now Wired Shut | |
| ML112900856 | 28 June 1979 | LER 79-011/03L-0 on 790529:no Min Flow in B Train Standby Gas Treatment Sys.Caused by Dilution Flow from Compressed Storage Not Isolated by BV-5.Replaced Positioner & Installed Filter in Cylinder Supply/Return Line | |
| ML112900877 | 1 August 1979 | LER 79-012/03L-0 on 790702:during Reactor Core Isolation Cooling Sys Test,Governor end-bearing Temp Alarm Received & Bearing Exhibited High Vibration.Sys Inoperative.Caused by Turbine Oil Pump Drive Gear Failure.Gears Replaced | |
| ML112900880 | 6 August 1979 | LER 79-014/03L-0 on 790709:water Leak Discovered in 1/2 Inch Instrument Line from Reactor Water Cleanup Sys Nonregenerative Heat Exchanger.Cause Not Determined.Leaking Line Isolated & Will Be Further Investigated & Repaired | |
| ML112900883 | 7 August 1979 | LER 79-013/03L-0 on 790708:motor Operator Failed,Rendering Torus Cooling Injection Valve Inoperable During Normal Operation.Caused by Failure of Motor Winding Due to Limit Switch Not de-energizing Motor.Switch Replaced | |
| ML112900889 | 10 August 1979 | LER 79-015/03L-0 on 790712:discovered Steam Leak from Intermediate Pressure Feedwater Heater.Cause Undetermined. Temporary Patch Installed Pending Replacement of Heater Shell | |
| ML112900903 | 31 August 1979 | LER 79-017/03L-0:on 790806,steam Leak Observed on Feedwater Extraction Steam Line Drain 15A.Caused by Steam Erosion Through Wall of Steam Trap on Line.Trap Isolated Pending Repair or Replacement at Next Appropriate Outage | |
| ML112900955 | 19 December 1979 | LER 79-021/03L-0:on 791119,during IE Bulletin 79-02 Evaluation,Snubber SS-31 Base Plate Expansion Anchor Bolt Safety Factor Found to Be Less than One.Caused by Inadequate Base Plate & Expansion Anchor Bolts | |
| ML112900974 | 14 January 1980 | Updated LER 79-023/01T-1:on 800103,one Fuel Type Noted to Exceed Max Allowable Max Average Planar Linear Heat Generation Rate Value & Another as Improperly Programmed in Plant Computer.Caused by Inadequate Review | |
| ML112900977 | 18 January 1980 | LER 79-024/03L-0:on 791220,during Normal Operation,Routine Operator Insp Revealed Steam Leak in 1-inch 90 Degree Elbow in Reactor Core Isolation Cooling Steam Line Drain to Condenser.Caused by Pinhole Failure of 3,000-lb Socket Weld | |
| ML112990392 | 28 February 1980 | Changes to QA Program for Operations Phase of Facility | Fire Protection Program |
| ML113210289 | 30 November 1993 | Control Room Habitability Toxic Chemical Study. | Unanalyzed Condition Siren |
| ML113210370 | 30 March 1993 | Rev 1 to GE-NE-637-0005-0393, Core Spray Crack Analysis for Monticello Nuclear Generating Plant. | Safe Shutdown Earthquake Flow Induced Vibration |
| ML18092A140 | 31 December 1983 | Annual Financial Rept 1983 | Weld Overlay |
| ML18092B469 | 31 December 1986 | Atlantic Electric 1986 Annual Rept. | |
| ML18093A738 | 31 December 1987 | Philadelphia Electric Co Annual Rept,1987. | |
| ML18095A379 | 20 July 1990 | Decommissioning Rept of Philadelphia Electric Co. | |
| ML18095B017 | 31 December 1988 | 1988 Annual Rept. W/890406 Ltr | Fuel cladding |
| ML19207B865 | 29 August 1979 | LER 79-024/01T-0:on 790815,during Response Tests for IE Bulletin 79-02,three or Four Failed Anchor Bolts Were Found on Support to 3D RHR Pump Section Piping.Caused by Improper Installation.Bolts Replaced & Passed Insp | |
| ML19208A736 | 5 September 1979 | LER 79-040/01T-0:on 790821,contract Personnel Disarmed Carbon Dioxide Sys & Established Fire Watch.Caused by Personnel Error.Sys Restored to Normal & Personnel Involved Received Instruction on Work Requirements | Fire Watch |
| ML19208A768 | 11 September 1979 | LER 79-037/03L-0:on 790812,A&B Control Room Intake Air Radiation Monitors a & B Failed Downscale.Caused by Transistor Circuit Failure within Monitors.Monitor a Replaced & Monitor B Repaired | |
| ML19208B454 | 14 August 1979 | Monthly Operating Rept for Aug 1979 | |
| ML19209A296 | 28 September 1979 | LER 79-025/03L-0:on 790829,during Tests,Reactor Vessel Relay 2E-K18 Failed.Caused by Worn Contact on GE Hfa Relay.Logic Channel Placed in Tripped Conditon & Relay Will Be Replaced During Refueling & Maint Outage | |
| ML19209A537 | 20 September 1979 | LER 79-043/01T-0:on 790906,two of Four Bolts on Hanger 32-GE-S41 Failed During Insp Program.Caused by Improper Installation of Bolt Anchor Shells.Defective Bolts Have Been Removed & Replaced by Wedge Type Anchor Bolts | |
| ML19209B429 | 5 September 1979 | RO 3-79-26/1P:on 790904,failure of Pipe Support Anchor on HPCI Pump Discharge Piping Noted.Undetermined Factor Caused Overstress Resulting in Failure.Vendor Presently Conducting Tests to Determine Optimum Method of Repair |