ULNRC-06349, Callaway, Unit 1 - Enclosure 3 to ULNRC-06349 - Document A22-1690-001, Rev. 0, Decommissioning Cost Analysis for the Callaway Energy Center, Appendix G, Page 12 of 14 - Appendix H, Page 20 of 20
05000336/LER-1990-001, :on 900110,discovered That Surveillances in Tech Specs for New Smoke Detectors & Suppression Sys Not Performed.Caused by Personnel Error.Fire Protection Sections of Tech Specs Updated
05000352/LER-1989-017, :on 890302,drywell H Mixing Sys Low Air Flow Elements Not in Compliance W/Environ Qualification Requirements.Caused by Failure of Architect/Engineer to Transfer Info Re Revised Environ Qualification
05000312/LER-1989-001, :on 890131,auxiliary Feedwater Pump P-318 Reached Overspeed Condition Resulting in Overpressurization of Auxiliary Feedwater Trains.Caused by Failure of Turbine Governor to Control Turbine Speed
05000327/LER-1989-012-01, :on 890410,containment Ventilation Isolation Occurred Due to Spurious High Radiation Spike on Noble Gas Channel of Lower Containment Radiation Monitor.Investigation of Incident to Be Completed by 890531
05000414/LER-1989-006-02, :on 890403,Tech Spec Action Statement Violated When Containment Purge Isolation Valves Open W/Containment Gas Radiation Monitor Inoperable.Caused by Incomplete Operating Procedure.Valves Closed
05000482/LER-1989-014, :on 890718,control Room Ventilation Isolation Signal Initiated by Spike on Control Room Air Intake Radiation Monitor.Caused by Voltage Transient Associated W/ Lamp Burning Out.Monitor Restored
05000325/LER-1989-011, :on 890404,determined That Reactor Jet Pump Once Per 24 H Operability Surveillance Had Been Missed Prior to Entering Operation Condition 2.Caused by Inadequate Review of Surveillance Rept
05000382/LER-1989-013, :on 890719,rapidly Decreasing Level Observed in Steam Generator 1 Resulting in Manual Reactor Trip.Caused by Circuit Failure in Position Control Circuitry.Circuit Card W/Failed Component Replaced & Sys Restored
05000424/LER-1987-081, :on 870505,discovered That Excessive Anchor Darling (AD) Valve Weight Could Have Prevented Fulfillment of Safety Sys Function.Caused by Failure of AD to Notify Bechtel of Change in Weights.Valves Reviewed
05000245/LER-1987-033, :on 870812,LPCI Subsystem a Inadvertently Initiated.Caused by Technician Error When Test Plug Connected to Wrong Jack During Surveillance on Automatic Pressure Relief Sys.Procedure Reviewed
05000461/LER-1987-042, :on 870812,reactor Scrammed on High Flux on APRM Channels B & D.Caused by Personnel Failure to Follow Procedures.Training Provided for Control & Instrumentation & Startup Personnel
05000482/LER-1987-037, :on 870910,reactor Trip,Feedwater Isolation & Auxiliary Feedwater Actuation Occurred Due to Failed Conductor.Caused by High Resistance & Heating at Bolted T-pad Connection.Line Conductor Replaced
05000341/LER-1987-029, :on 870615,surveillance Requirement for Determining Operability of Circuits Inadequate.Caused by Misinterpretation of Tech Spec.Surveillance Procedure Revised to Reflect Surveillance Requirement
05000281/LER-1987-004-03, :on 870831,while Performing Surveillance Procedure,Containment Cooling Water Outlet Header Isolation Trip Valve Found Inoperable.Caused by Ruptured Diaphragm in Air Pilot Relay.Relay Replaced
05000424/LER-1989-003, :on 890119,ESF Train B Chiller Removed from Svc for Calibr,Resulting in Entering Limiting Condition for Operation 1-89-032.Caused by Personnel Calibr Wrong Train. Train B Restored to Operable Status
05000333/LER-1997-008-01, :on 970806,both Trains of SGTS Were Declared Inoperable Due to Flow Restriction in Discharge Line. Developed Periodic Surveillance That Can Adequately Detect Blockage in Drain Line
05000414/LER-1999-005-02, :on 990727,missed Emergency DG TS Surveillance Concerning Verification of Availability of Offsite Power Sources,Was Declared.Caused by Defective Procedure.Revised Affected Procedure
05000316/LER-1986-030, :on 861112-13,unit Operated W/One air-operated Containment Isolation Valve Inservice W/O Having Closing Time Determined After Packing Adjustment.Caused by Personnel Error.Leak Test Procedure Will Be Revised
05000220/LER-1986-029, :on 860910,instrument & Control Dept Surveillance Test Not Performed within Required Interval. Caused by Unintentional Deletion of Test from Schedule. Personnel Advised & Schedule Updated
05000317/LER-1997-008, :on 971017,two Reactor Protective Sys Channels Were OOS During Test.Caused by Significant Variations in Power Supply Voltages.Requested Maint to Back Out of Calibr of Channel C & Return Channel to Svc
05000213/LER-1996-014, :on 960726,identified Discrepancy in Mesh Sizing,Screen fit-up & Method of Attachment.Caused by Inadequate Documentation of Addition of Screen During Const Coupled W/General Acceptance.Sump Screen Replaced
05000395/LER-1986-007, :on 860422,reactor Bldg Space Spray Pump B Inadvertently Started.Cause Not Determined.Spray Pump Discharge Valve Remained Closed & No Flow Introduced Into Reactor Bldg
05000298/LER-1988-015, :on 880520,unplanned Actuation of Reactor Protection Sys & ESF Group Isolations Occurred.Caused by Procedural Deficiency.Reactor Protection Sys & Group Isolation Reset & Affected Sys Restored
05000321/LER-1988-011-02, :on 880509,determined That Design Deficiency Could Affect Control Room Environ Control Sys.Caused by Design Deficiency Resulting from Single Failure Criteria. Area Radiation Monitors Modified
05000318/LER-1987-009-01, :on 871221,reactor Tripped Due to Loss of Load Signal.Caused by Failure of Main Generator Permanent Magnet Generator Due to Misaligned Stator frame.Turbine-generator Maint Procedure Upgraded
05000327/LER-1988-012, :on 880301,ESF Actuation Containment Ventilation Isolation Occurred.Caused by Prefilters Clogging Due to Suspended Particulate Near Radiation Monitor. Prefilter Change Frequency Increased
05000266/LER-1997-021, :on 970430,determined That Spent Fuel Pool Cooling Sys Was Not in Accordance W/Plant Design Basis.Cause Indeterminate.Closed & re-tagged Valves SF-27 & SF-28 & Investigated Basis for Fsar,App a
05000482/LER-1985-076, :on 851031,inadvertent Start of Turbine Driven Auxiliary Feedwater Pump Occurred Due to ESF Actuation. Caused by Cognizant Personnel Failure to Identify & Block Actuation Signal.Personnel Counseled
05000373/LER-1996-008-01, :on 960628,all Cscs,Eccs & DGs Declared Inoperable Due to Foreign Matl Injected Into Svc Water Tunnel.Caused by Inadequate Work Control.Tunnel Cleaned & Inspected,Floor & Wall Repair Work Stopped
05000325/LER-1992-025, :on 920915,discovered That Effluent Sampling Equipment Not in Svc When Reactor Bldg Ventilation Sys Started.Caused by Procedure Prerequisites Not Being Verified Adequately.Procedural Enhancements Evaluated
05000366/LER-1984-022, :on 841006,motor Leads Disconnected to RHR Svc Water Pumps 1E11-COO1B & 1E11-COO1D.Caused by Personnel Error.Personnel Counseled
05000374/LER-1984-029-01, :on 840611,w/unit at 0% Power in Mode 2, Isolation of Reactor Water Cleanup Occurred Due to High Differential Flow.Caused by Differences Between Influents to & Effuents from Reactor Water Cleanup Sys
05000423/LER-1991-030, :on 911219,engineering Evaluation Concluded Failure of Three Normally Energized Auxiliary Relays for MOV Was Caused by Insulation Breakdown.Caused by Accelerated Thermal aging.Non-SR J10s Evaluated & Replaced
05000446/LER-1994-011, :on 940722,discovered TS Surveillance Testing of Solid State Logic Protection Sys Had Not Satisfied Test Basis Requirement.Caused by Personnel Error.Personnel Involved Counselled
05000336/LER-1990-022-01, :on 901115,svc Water Header cross-tie Valve, 2-SW-97A Found Open.Cause Unknown But Most Likely Due to Improper Positioning of cross-tie Valve.Procedures Will Be Changed & Valve Position Indication Enhanced
05000352/LER-1993-017, :on 930705,discovered Condition Prohibited by TS in Special Rept for Inoperable Seismic Monitoring Sys Not Submitted in TS Time Period.Caused by Misinterpretation of TS Limiting Conditions.Procedures Revised
05000320/LER-1993-002-02, :on 930601,failed to Obtain Weekly Tritium Grab Samples of Chemical Cleaning Building Exhaust Due to Inadequate Monitoring of Tritium Sample Apparatus Sample Chamber Operability.Initiated Weekly Insp
05000213/LER-1993-002, :on 930323,control Rods 31 & 32 Malfunctioned When Operators Attempted to Insert Control Bank B.Caused by Inadequate Procedural Verification on Maint of Control Rod Contactors.Mechanical Fasteners Tightened
05000245/LER-1991-028-01, :on 911107,determined That Postulated Seismic Event Could Result in Inoperability of EDG & Feedwater Coolant Injection Sys.Caused by Insufficient Number of Anchor Bolts Installed.Baseplates Inspected
05000277/LER-1989-031-01, :on 891206,discovered That Four Agastat Relays Not Properly Secured by Seismic Support Straps.Root Cause Under Investigation & Will Be Reported in Rev to Ler.Support Straps Promptly Reconnected
05000423/LER-1989-032, :on 891203,both Channels of Source Range Hi Flux at Shutdown Alarm Found Blocked.Caused by Personnel Error.Channel Unblocked,Dilution Accident Verified Not in Progress & Operator Involved Counseled
05000250/LER-1988-010, :on 880528,containment Ventilation & Control Room Ventilation Isolation Occurred While Containment Radiation Monitor Setpoint Being Checked.Drawer for Monitor R-11 Initiated Signals.Drawer Replaced
05000315/LER-1988-008, :on 880907,noted That Four Hydrogen Skimming Dampers Mispositioned.Caused by Personnel Improperly Verifying Lineup on 870827.Dampers Repositioned & Sys Lineup Procedures Revised
05000327/LER-1986-054, :on 861201,discovered That Discrepancy Existed Between Data Contained on Drawings for 125-volt Dc Vital Battery Sys & Data Used in Surveillance Instruction (SI)- 105.Instruction Will Be Revised
05000423/LER-1991-014, :on 910609,reactor & Subsequent Turbine Trip Occurred.Caused by phase-to-ground Fault on 345 Kv Sys Transmission Line & Loose Restraint Tap of Relay.Tap Screw & Wiring Repaired & Relay Returned to Svc