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The following pages link to 05000259/LER-2012-001, Regarding Unanalyzed Conditions Discovered During NFPA 805 Transition Review:
Displayed 24 items.
- 05000259/LER-2012-001 (redirect page) (← links)
- IR 05000259/2013003 (← links)
- IR 05000259/2012004 (← links)
- 05000259/LER-2017-001 (← links)
- 05000259/LER-1982-041, Forwards LER 82-041/03L-0 (← links)
- 05000259/LER-1982-039, Reissued LER 82-039/03L-0:on 820609,fuse Blew Resulting in Inboard Primary Containment Isolation.Caused by Shorted Coil for Relay 16A-K66B,GE Type CR120A.Fuse & Relay Coil Replaced & Hydrogen Analyzers Returned to Normal (← links)
- 05000259/LER-1982-037, Forwards LER 82-037/03L-0 (← links)
- 05000259/LER-1982-035, Forwards LER 82-035/03L-0 (← links)
- 05000259/LER-1982-032, Forwards LER 82-032/03L-0 (← links)
- 05000259/LER-1982-034, Forwards LER 82-034/03L-0 (← links)
- 05000259/LER-1982-033, Forwards LER 82-033/01T-0 (← links)
- 05000259/LER-1982-017, Forwards LER 82-017/03L-0 (← links)
- 05000259/LER-1982-019, Forwards LER 82-019/03L-0 (← links)
- 05000259/LER-1982-029, Forwards LER 82-029/03L-0 (← links)
- 05000259/LER-1982-028, Forwards LER 82-028/03L-0 (← links)
- 05000259/LER-1982-022, Forwards LER 82-022/03L-0 (← links)
- 05000259/LER-1982-026, Forwards LER 82-026/03L-0 (← links)
- 05000259/LER-1982-021, Forwards LER 82-021/03L-0 (← links)
- 05000259/LER-1982-077, Forwards LER 82-077/03L-0 (← links)
- 05000259/LER-1982-076, Forwards LER 82-076/03L-0 (← links)
- 05000259/LER-1982-073, Forwards LER 82-073/03L-0 (← links)
- 05000259/LER-1982-065, Forwards LER 82-065/03L-0 (← links)
- 05000259/LER-1982-051, Forwards LER 82-051/03L-0 (← links)
- 05000259/LER-1980-076, Forwards LER 80-076/03L-0 (← links)
- 05000259/LER-1980-072, Forwards LER 80-072/03L-0 (← links)
- 05000259/LER-1982-097, Forwards LER 82-097/03L-0 (← links)
- 05000259/LER-1978-029, Forwards LER 78-029/01T-0 (← links)
- 05000259/LER-1982-095, Forwards LER 82-095/03L-0 (← links)
- 05000259/LER-1982-070, Forwards LER 82-070/03L-0 (← links)
- 05000259/LER-1982-075, Forwards LER 82-075/01T-0 (← links)
- 05000259/LER-1982-072, Forwards LER 82-072/03L-0 (← links)
- 05000259/LER-1982-062, Forwards LER 82-062/01T-0 (← links)
- 05000259/LER-1982-058, Forwards LER 82-058/03L-0 (← links)
- 05000259/LER-1982-055, Forwards LER 82-055/03L-0 (← links)
- 05000259/LER-1982-052, Forwards LER 82-052/03L-0 (← links)
- 05000259/LER-1982-050, Forwards LER 82-050/03L-0 (← links)
- 05000259/LER-1982-047, Forwards LER 82-047/03L-0 (← links)
- 05000259/LER-1982-049, Forwards LER 82-049/03L-0 (← links)
- 05000259/LER-1982-048, Forwards LER 82-048/03L-0 (← links)
- 05000259/LER-1982-054, Forwards LER 82-054/01T-0 (← links)
- 05000259/LER-1982-053, Forwards LER 82-053/01T-0 (← links)
- 05000259/LER-1981-072, Forwards LER 81-072/03L-0 (← links)
- 05000259/LER-1981-071, Forwards LER 81-071/03L-0 (← links)
- 05000259/LER-1981-070, Forwards LER 81-070/03L-0 (← links)
- 05000259/LER-1980-087, Forwards LER 80-087/03L-0 (← links)
- 05000259/LER-1980-070, Forwards LER 80-070/011-0 (← links)
- 05000259/LER-1982-044, Forwards LER 82-044/03L-0 (← links)
- 05000259/LER-1982-046, Forwards LER 82-046/03L-0 (← links)
- 05000259/LER-1982-043, Forwards LER 82-043/03L-0 (← links)
- 05000259/LER-1982-045, Forwards LER 82-045/03L-0 (← links)
- 05000259/LER-1983-004, Forwards LER 83-004/03L-0 (← links)
- 05000259/LER-1983-006, Forwards LER 83-006/01T-0 (← links)
- 05000259/LER-1983-001, Forwards LER 83-001/03L-0 (← links)
- 05000259/LER-1982-099, Forwards LER 82-099/01T-0 (← links)
- 05000259/LER-1982-092, Forwards LER 82-092/03L-0 (← links)
- 05000259/LER-1982-091, Forwards LER 82-091/03L-0 (← links)
- 05000259/LER-1982-090, Forwards LER 82-090/03L-0 (← links)
- 05000259/LER-1982-093, Forwards LER 82-093/01T-0 (← links)
- 05000259/LER-1982-088, Forwards LER 82-088/03L-0 (← links)
- 05000259/LER-1983-017, Forwards LER 83-017/03L-0 (← links)
- 05000259/LER-1982-087, Forwards LER 82-087/03L-0 (← links)
- 05000259/LER-1982-084, Forwards LER 82-084/03L-0 (← links)
- 05000259/LER-1982-081, Forwards LER 82-081/03L-0 (← links)
- 05000259/LER-1982-085, Forwards LER 82-085/03L-0 (← links)
- 05000259/LER-1982-086, Forwards LER 82-086/01T-0 (← links)
- 05000259/LER-1995-001, Forwards LER 95-001 Re Inadvertent ESF Actuation Due to Auto Start of Emergency Equipment Cooling Water Pump.Event Occurred as Result of Jumpering Wrong Relay Contacts During Performance of Surveillance Instruction (← links)
- 05000259/LER-1982-064, Updated LER 82-064/03X-1:on 820823 & Jan 1984,Station II Cable Tray Fixed Spray Sys Did Not Meet Tech Spec Requirements.Caused by Restriction in Supply Line Strainer Due to Buildup of Silt & Clam Shells (← links)
- 05000259/LER-1982-101, Forwards LER 82-101/03L-0 (← links)
- 05000259/LER-1983-019, Forwards LER 83-019/03L-0 (← links)
- 05000259/LER-1983-002, Forwards LER 83-002/03L-0 (← links)
- 05000259/LER-1982-098, Forwards LER 82-098/03L-0 (← links)
- 05000259/LER-1982-096, Forwards LER 82-096/01T-0 (← links)
- 05000259/LER-1983-021, Forwards LER 83-021/01T-0 (← links)
- 05000259/LER-1982-030, Forwards Updated LER 82-030/03X-1 (← links)
- 05000259/LER-1980-049, Forwards Updated LER 80-049/03X-1 (← links)
- 05000259/LER-1983-015, Forwards LER 83-015/03L-0 (← links)
- 05000259/LER-1983-014, Forwards LER 83-014/03L-0 (← links)
- 05000259/LER-1983-016, Forwards LER 83-016/03L-0 (← links)
- 05000259/LER-1980-011, Forwards Updated LER 80-011/01X-5 (← links)
- 05000259/LER-1983-012, Forwards LER 83-012/03L-0 (← links)
- 05000259/LER-1983-013, Forwards LER 83-013/01T-0 (← links)
- 05000259/LER-1983-010, Forwards LER 83-010/03L-0 (← links)
- 05000259/LER-1983-011, Forwards LER 83-011/03L-0 (← links)
- 05000259/LER-1982-005, Forwards Updated LER 82-005/03X-1 (← links)
- 05000259/LER-1982-020, Forwards Updated LER 82-020/03X-1 (← links)
- 05000259/LER-1981-089, Forwards Updated LER 81-089/03X-1 (← links)
- 05000259/LER-1981-069, Forwards Updated LER 81-069/03X-1 (← links)
- 05000259/LER-1982-011, Forwards LER 82-011/03L-0 (← links)
- 05000259/LER-1983-008, Forwards LER 83-008/03L-0 (← links)
- 05000259/LER-1983-009, Forwards LER 83-009/01T-0 (← links)
- 05000259/LER-1983-007, Forwards LER 83-007/03L-0 (← links)
- 05000259/LER-1985-054, Advises That LER 85-054-00 Cancelled (← links)
- 05000259/LER-1979-016, Forwards LER 79-016/03L-0 (← links)
- 05000259/LER-1997-004, Forwards LER 97-004-00 Re Discovery of non-conservative TS Lco.Will Submit TS Change Request to NRC to Remove non- Conservatism (← links)
- 05000259/LER-1982-056, Forwards Updated LER 82-056/01X-1 (← links)
- 05000259/LER-1980-056, Forwards Updated LER 80-056/03L-1 (← links)
- 05000259/LER-1981-037, Forwards Updated LER 81-037/01X-2 (← links)
- 05000259/LER-1998-002, Forwards LER 98-002-00 Re Inadequate Surveillance Instruction for Calibr of Standby Gas Treatment Sys Relative Humidity Control Heater Flow Switches.Calibr Performed to Determine Operability of Flow Switches (← links)
- 05000259/LER-1998-001, Forwards LER 98-001-00 Re Failure to Meet Requirements of ANSI Stds N510-1975, Testing of Nuclear Air Cleaning Sys, During Performance of Standby Gas Treatment Sys Surveillance Testing (← links)
- 05000259/LER-1998-003, Forwards LER 98-003-00 Re Condition Which Resulted in Required Volume of Nitrogen Stored Onsite for CAD Not Being Sufficient to Meet Design Basis as Stated in TS Bases (← links)
- 05000259/LER-1982-040, Forwards LER 82-040/03L-0 (← links)
- 05000259/LER-2024-001-01, Inoperability of Unit 3 Diesel Generator Due to Relay Failure (← links)
- 05000259/LER-2024-002, Reactor Scram Due to Generator Step-Up Transformer Failure (← links)
- 05000259/LER-2024-001, Inoperability of Unit 3 Diesel Generator Due to Relay Failure (← links)
- 05000259/LER-2024-003, Valid Specified System Actuation Caused the Automatic Start of Emergency Diesel Generators (← links)
- 05000259/LER-2024-001-02, Secondary Containment Isolation Valve Inoperable Due to Mechanical Failure (← links)
- 05000259/LER-2023-003, Standby Liquid Control Inoperable Due to Demineralized Water In-Leakage (← links)
- 05000259/LER-2022-002-01, High Pressure Coolant Injection System Declared Inoperable Due to a Corroded Actuator (← links)
- 05000259/LER-2023-002, Full Reactor Scram Due to an Oscillation Power Range Monitor (OPRM) Confirmation Density Algorithm (CDA) Trip (← links)
- 05000259/LER-2023-001-01, High Pressure Coolant Injection System Inoperable Due to a Torn Valve Diaphragm (← links)
- 05000259/LER-2023-001, High Pressure Coolant Injection System Inoperable Due to a Torn Valve Diaphragm (← links)
- 05000259/LER-2022-002, High Pressure Coolant Injection System Declared Inoperable Due to a Corroded Actuator (← links)
- 05000259/LER-2021-001-01, Volt Load Shed Logic Inoperable Longer than Allowed by Technical Specifications Due to Failed Relay (← links)
- 05000259/LER-2022-001-01, Pressure Boundary Leak on Residual Heat Removal System Low Pressure Coolant Injection Test Line (← links)
- 05000259/LER-2022-001, From Browns Ferry Nuclear Plant, Unit 1 Regarding Pressure Boundary Leak on Residual Heat Removal System Low Pressure Coolant Injection Test Line (← links)
- 05000259/LER-2021-001, Volt Load Shed Logic Inoperable Longer than Allowed by Technical Specifications Due to Failed Relay (← links)
- 05000259/LER-2020-003-01, Main Steam Relief Valves Lift Settings Outside of Technical Specifications Required Setpoints (← links)
- 05000259/LER-2020-002-01, Standby Gas Treatment System Train B Inoperable Longer than Allowed by Technical Specifications (← links)
- 05000259/LER-2020-003, Main Steam Relief Valves Lift Settings Outside of Technical Specifications Required Setpoints (← links)
- 05000259/LER-2020-002, Standby Gas Treatment System Train B Inoperable Longer than Allowed by Technical Specifications (← links)
- 05000259/LER-2020-001-01, Manual Reactor Shutdown of Two Units on Decreasing Condenser Vacuum Due to Eel Grass Intrusion (← links)
- 05000259/LER-2020-001, Re Manual Reactor Shutdown of Two Units on Decreasing Condenser Vacuum Due to Eel Grass Intrusion (← links)
- 05000259/LER-1998-002-01, :on 980521,determined That Flow Switch Calibr Test Did Not Ensure Calibr of Both Instrument Channels as Required by Tss.Caused by Technical Inaccuracies in Surveillance Instruction.Surveillance Instructions Revised (← links)
- 05000259/LER-1989-007, :on 890305,when Diesel Generator Start Logic Energized,Diesel Generator Unexpectedly Started.Caused by Start Failure Relay Start Logic Not Reset After Earlier Logic Testing.Diesel Generator Shutdown (← links)
- 05000259/LER-1989-014, :on 890606,diesel Generators 1B & 1D auto-started During Performance of Surveillance Procedure O-SI-4.9.A.3.a,resulting in Actuation of Esf.Caused by Personnel Error.Procedure Revised (← links)
- 05000259/LER-1989-012-02, :on 890505,fault in Isolated Phase Bus Duct on Secondary Side of Main Transformer 1A Occurred.Caused by Lack of Administrative Control on Operation of Bus Duct Cooling Sys.Standoff Insulators Replaced (← links)
- 05000259/LER-1989-011-02, :on 890503,determined That Emergency Equipment Cooling Water anti-siphon Check Valves Have Potential for Transporting Uncontrolled & Unfiltered Secondary Containment Atmosphere to Outside Atmoshere (← links)
- 05000259/LER-1989-009-02, :on 890322,discovered That Single Failure of Electrical Fire Pump Lock Out Relay During Loss of Power/ LOCA Could Overload Diesel Generator.Caused by Condition Existing in Original Design (← links)
- 05000259/LER-1989-004-01, :on 890209,condensate Storage Tank Decreased from 26.7 Ft to 10.1 Ft.Caused by Mechanical Failure of Condensate Head Tank Heat Trace.Heat Trace on Condensate Head Tank Repaired (← links)
- 05000259/LER-1988-036, :on 881018,unanalyzed Conditions Identified Re Loading & Sequencing of Loads on safety-related Electrical Distribution Sys.Caused by Inadequate Design Control & Review Program at Time of Original Design (← links)
- 05000259/LER-1988-035, :on 881021,unplanned Automatic Start of Train B of Control Room Emergency Ventilation Occurred.Caused by Procedural Inadequacy.Scheduling & Work Control Program Upgraded to Require Impact Evaluation (← links)
- 05000259/LER-1989-023-02, :on 890824,determined That Disabling auto-start Feature of Emergency Equipment Cooling Water (EECW) Sys Pump Rendered EECW Inoperable.Caused by Deficient Surveillance Instruction.Instruction Revised (← links)
- 05000259/LER-1989-015-01, :on 890627,both Doors of Unit 1 Airlock Opened Simultaneously for 5 Constituting Breach of Secondary Containment.Caused by Weld Failure on Door Lock Mechanisms. Bracket Reattached & Door Operation Verified (← links)
- 05000259/LER-1989-024-02, :on 890826 & 0920,reactor Protection Sys Bus 1B Deenergized Resulting in Actuation of Plant Esfs.Caused by Inadequate Design of Protector Setpoints.Degraded Voltage Adjustment Potentiometer Replaced (← links)
- 05000259/LER-1989-006-01, :on 890228,loss of Secondary Containment Integrity Occurred When Ventilation Exhaust Radiation Monitor Repaired on 890225 But Not Tested Following Maint. Caused by Personnel Error.Procedures Revised (← links)
- 05000259/LER-1989-017-02, :on 890701,potential Transformer Compartment Door on 4 Kv Shutdown Board B Fell Open Disconnecting Fuse & Cabinet Contacts.Caused by Door Latching Mechanism Failure. General Operating Instruction to Be Issued (← links)
- 05000259/LER-1989-015-02, :on 890627,both Doors of Airlock Opened Simultaneously for Approx 5 S.Caused by Failure of Two Welds Which Attach Bracket That Holds Lockset on Refuel Floor Side.Lockset Bracket Reattached & Signs Placed (← links)
- 05000259/LER-1998-001-03, :on 980414,standby Gas Treatment Sys HEPA Filter Testing Was Not in Compliance W/Ansi Std Requirements.Caused by Lack of Understanding of DOP Testing. Filter Testing Training Will Be Provided (← links)
- 05000259/LER-1989-022-02, :on 890810,Train a of Control Room Emergency Ventilation Sys Actuated Due to Radiation Monitor Signal. Caused by Insertion of Radiation Detector Checksource. Monitor 3-RM-90-259B Functionally Tested (← links)
- 05000259/LER-1988-007-01, :on 880127,calibr Error Discovered in Four RHR Svc Water (RHRSW) Pump Flow Instruments.Caused by Error on Flow Transmitter Data Sheet.Pump 2D Rebuilt & Impeller Replaced.Rhrsw Pumps Met Tech Spec Flow Rate (← links)
- 05000259/LER-1989-008-02, :on 890420,determined That Design of Primary Containment Hydrogen & Oxygen Analyzers Cooling Water Discharge Did Not Meet Single Failure Criteria & Outside Design Basis for Plant (← links)
- 05000259/LER-1989-021-02, :on 890807,identified That Continuous Fire Watch Not Established for Two Fire Doors as Required by Tech Specs.Caused by Personnel Error.Operations Supervisor Notified & Continuous Watch Posted (← links)
- 05000259/LER-1988-036-01, :on 881018,two Possible Unanalyzed Electrical Loading on Safety Related Electrical Sys Identified.Caused by Inadequate Design Control & Review Program.Accident Signals from Units 1 & 2 Disabled (← links)
- 05000259/LER-1989-006, :on 890228,discovered That Secondary Containment Ventilation Exhaust Radiation Monitor Repaired on 890225 W/O Being Tested Following Maint.Caused by Personnel Error.Plant Procedures Revised (← links)
- 05000259/LER-1989-019-02, :on 890726,radiation Monitor on Refuel Zone Ventilation Exhaust Received Spurious Signal.Caused by Failed Connection at Radiation Detector Assembly.Radiation Detector Repaired & Declared Operable (← links)
- 05000259/LER-1988-038, :on 881017,discovered That Min Set of Electrical Calculations Unavailable to Confirm Technical Adequacy of Electrical Sys.Calculation Program Established & Will Be Performed Prior to Restart (← links)
- 05000259/LER-1989-003-01, :on 890131,determined That Original Design of Suppression Pool Vacuum Relief Sys Does Not Meet Single Failure,Double Isolation Design Criteria.Caused by Design Error.Design Will Be Modified (← links)
- 05000259/LER-1989-014-02, :on 890606,diesel Generators 1B & 1D auto- Started During Performance of 0-SI-4.9.A.3.a.Caused by Personnel Error.Procedure Immediately Revised to Include Precautionary Note Re Insulation of Terminals (← links)
- 05000259/LER-1989-012-01, :on 890505,fault Occurred in Isolated Phase Bus Duct on Secondary Side of Unit 1 Main Transformer 1A.Caused by Lack of Administrative Control on Operation.Proper Operational Controls Developed & Implemented (← links)
- 05000259/LER-1989-018-02, :on 890712,determined That Area Coolers for RHR & Core Spray Pumps Possibly Operated W/Degraded Flow Rates. Caused by Lack of Procedure/Program Re Flow Rate Measuring. Maint Requests Written (← links)
- 05000259/LER-1988-023-02, :on 880818,observed Groundwater Entering RHR Svc Pump Room Through Pipe Penetration.Caused by Inadequate Water Seal Design of Piping Penetration.Water Tight Seal Being Designed & Will Be Installed.W/Undated Ltr (← links)
- 05000259/LER-1988-028-02, :on 880205,discovered That Pressure Switches Which Start Emergency Equipment Cooling Water Strainer Motor Procured to Seismic Class II Requirements.Caused by Inadequate Purchasing Procedural Control.W/Undated Ltr (← links)
- 05000259/LER-1989-010, :on 890323,ESF Actuations Occurred.Caused by Output Voltage of Reactor Protection Sys Motor Generator Set 1B Rising Above Circuit Protector Overvoltage Relay Setpoint.Actuation Logic Reset (← links)
- 05000259/LER-1987-022-01, :on 870811,ESF Actuation Occurred Due to Two Emergency Equipment Cooling Water Pumps Inadvertently Starting.Caused by Personnel Error in Calibr of Pressure Switch.Wire Moved & Terminated & Switch Reset (← links)
- 05000259/LER-1987-019-01, :on 870806,testing Required to Satisfy Tech Spec 3.11.A.9 Re Fire Protection Sys Capability,Not Completed.Caused by Vibration Problems W/One Test Hydrant. Hydrant Replaced.Test Completed on 870820.W/870904 1tr (← links)
- 05000259/LER-1987-018-01, :on 870807,spurious Opening of Reactor Protection Sys Circuit Protector Occurred.Cause Not Revealed by Investigation.Further Corrective Action Not Planned.W/ (← links)
- 05000259/LER-1987-020-01, :on 870802,primary Containment Isolation Occurred.Caused by RWCU Temp Switch Failure.Power Supply Amplifier Board Replaced,Temp Switch Recalibr & Isolation Reset & RWCU Returned to Svc (← links)
- 05000259/LER-1987-017-01, :on 870717,18 Sealed Check Sources Containing Approx 5 Uci Sr-90 Found.On 870731,Sr-90 Source Discovered Having Been Disposed Of.Procedures Being Revised.Matl Responsibility Being Shifted (← links)
- 05000259/LER-1987-013-01, :on 870712,standby Gas Treatment Sys Trains A,B & C & Control Room Emergency Ventilation Sys Trains a & B Actuated & Refuel Zone Isolation Occurred.Caused by Setpoint of Detector Lower than Vendor Recommendation (← links)
- 05000259/LER-1987-016-01, :on 870710,fire Barrier Breached W/O Required Compensatory Measures.Caused by Personnel Error.Electrical Maint Foreman Involved Counseled on Proper Method & Responsibility for Initiating Breach (← links)
- 05000259/LER-1987-001, :on 870127,no Fire Watch Posted Per Tech Specs When Hose Being Replaced on Fire Protection Sys.On 870210, Another Fire Watch Infraction Occurred When Personnel Reported to Wrong Cable Room (← links)
- 05000259/LER-1987-029-01, :on 871105,ESF Actuations Occurred During Mod Activities.Caused by Personnel Error.Individuals Involved Cautioned (← links)
- 05000259/LER-1987-017, :on 870717,0731 & 0930,various Tech Specs Requirements Re Proper Radioactive Matl Inventory & Record Retention Not Satisfied.Caused by Deficient Procedure. Procedural Guidance Will Be Revised (← links)
- 05000259/LER-1998-001-01, Forwards LER 98-001-01 Re Failure to Meet Requirements of ANSI N510-1975 During Performance of SGTS Surveillance Testing.Both SGT & Units 2 & 3 Containment Purge HEPA Filters Meet Leakage Requirements of TS (← links)
- 05000259/LER-1987-006, :on 870302,discovered That Routine Flow Rate Surveillance on Control Room Emergency Ventilation Train B Performed Incorrectly Night Before.Caused by Personnel Error.Flow Measured & Correctly Set (← links)
- 05000259/LER-1987-014-01, :on 870708,control Room Emergency Ventilation Sys Measured Flow Rates in Excess of Design Basis Flow Rate. Caused by Throttle Dampers Not Set to Deliver Flow on Optimum Filtration.Procedure to Be Revised (← links)
- 05000259/LER-1987-015-01, :on 870709,reactor Protection Sys (RPS) Circuit Protector Tripped de-energizing RPS Bus a Causing RPS Half Scram.Caused by Mods Craftsmen Working Near Circuit Jarring Panel.Craftsmen Counseled (← links)
- 05000259/LER-1987-028-01, :on 871008,unplanned Containment Isolations Occurred.Caused by Inadequate Procedures.Radiation Monitoring Sys & Alarm Response Procedures Revised (← links)
- 05000259/LER-1987-024-01, :on 870930,unplanned RWCU Isolation Occurred. Caused by Degraded Electrical Connections on Temp Switch. Isolation Reset & Sys Returned to Svc.Connections on Temp Switch Repaired (← links)
- 05000259/LER-1989-002-02, :on 890208,buried Raw Cooling Water Discharge Piping Between Reactor Bldgs & Circulating Water Discharge Conduit Not Seismically Qualified.Caused by Design Error. Corrective Action Evaluated & Implemented (← links)
- 05000259/LER-1980-090-03, /03L-1:on 801210,during Normal Operation, Continuous Air Monitor for Reactor/Turbine Ventilation Exhaust Declared Inoperable.Caused by Iodine Channel Indication Downscale.Instrument Repaired (← links)
- 05000259/LER-1987-026-01, :on 870915,Train a of Control Room Emergency Ventilation Sys (Crev) Would Not Start If Offsite Power Was Lost.Caused by Design Error.Activities Requiring Crev Operation Stopped Until Problem Corrected (← links)
- 05000259/LER-1987-025-01, :on 870909,discovered That Tech Spec Surveillance Requirement for Diesel Generators Not Incorporated Into Plant Instructions.Caused by Procedural Inadequacy.Testing Program in Progress (← links)
- 05000259/LER-1989-003, :on 890131,design of Suppression Pool Vacuum Relief Sys May Not Meet Current Single Failure Criterion for Primary Containment Isolation.Caused by Not Considering Criterion in Original Design for Mark I Plants (← links)
- 05000259/LER-1984-008, :on 840129,trouble Alarms Annunciated in Reactor Protection Sys Analog Trip Units Due to Downscale Failure of Differential Transmitters.Caused by Instrument Sensing Line Snubbers.Snubbers Removed (← links)
- 05000259/LER-1987-012-01, :on 870506 & 07,alternate Power Supply Breaker Failed to Close & ESF Actuation Occurred.Caused by Grease & Dirt Buildup on Control Cell Linkages Preventing Proper Operation.Linkages Cleaned & Lubricated (← links)
- 05000259/LER-1987-008, :on 870420,phase to Phase Short Occurred Between Contacts in Diesel Generator Control Cabinet.Caused by Failure of Potential Transformer Fuse Contacts.Fuse & Spring Finger Contacts Will Be Bypassed (← links)
- 05000259/LER-1988-032-01, :on 880914,discrepancies Discovered in Electrical Cable Classifications & Cable Routings Indicates Violation of Requirements.Caused by Inadequate Design Control.Design Program Improved Significantly (← links)
- 05000259/LER-1987-023-01, :on 870826,samples Normally Retained for Quarterly Strontium Calculation Mistakenly Discarded.Caused by Personnel Error.Surveillance Instructions Revised to Stress Labeling & Storage of Samples (← links)
- 05000259/LER-1989-001-02, :on 890118 & 881209,determined That Seismic Documentation Could Not Be Established for Various Positions of 4,160-volt & 480-volt safety-related Circuit Breakers. Breakers Placed in Qualified Position (← links)
- 05000259/LER-1987-031-02, :on 871204,autostart of Control Room Emergency Ventilation Sys Occurred.Caused by Restart Test Procedural Inadequacy.Restart Test Procedure Revised to Specify Transfer Switch Position (← links)
- 05000259/LER-1987-030-01, :on 871124,Train B of Control Room Emergency Ventilation Sys Actuated.Caused by Burned Electrical Coil in Unit 3 Relay 16A-K72 Due to end-of-life Failure.Faulted Coil Replaced (← links)
- 05000259/LER-1987-021-02, :on 870531,insp Found Certain Main Control Room Vertical Panels Mounted in Manner Inconsistent W/Fsar for Seismic Qualification.Caused by Failure to Incorporate Design Assumptions Into Design Drawings (← links)
- 05000259/LER-1997-003-04, :on 970812,potential for Containment Pressure to Exceed Design During Purging or Inerting If LOCA Occurred Due to Unanalyzed Suppression Pool Bypass Path Was Noted. Caused by Design Error.Revised Sys Operating Instructions (← links)
- 05000259/LER-1985-031-01, :on 850706-09,seismically Unqualified Flanged Joints Discovered as Result of Engineering Reviews.Caused by Failure of Design Organization to Properly Specify Range Types & Matl During Original Plant Const (← links)
- 05000259/LER-1986-030-01, :on 860922,automatic Isolation of RWCU Occurred While Preventative Maint Performed on Relay in A1 Trip Channel.Caused by Random Failure of Fuse in B2 Trip Channel.Relays Reenergized & Isolation Reset (← links)
- 05000259/LER-1986-031, :on 861105,reactor Protection Sys Channel 1A Deenergized When Circuit Protector Tripped Motor Generator Set.Caused by Dirty Voltage Adjustment Potentiometer,Causing Output Voltage to Drop.Potentiometer Cleaned (← links)
- 05000259/LER-1986-028-01, :on 860828,personnel Access Doors from Turbine Bldg Into Reactor Bldg Opened at Same Time Resulting in Momentary Loss of Secondary Containment.Caused by Rectifier Solenoid Failure.Rectifier Replaced (← links)
- 05000259/LER-1987-009-01, :on 870420,during Preparation for Unloading 4 Kv Electrical Board for Breaker Maint,Esf Actuated.Caused by Licensed Operator Performing Unnecessary Switching Operation.Sys Restored & Personnel Counseled (← links)
- 05000259/LER-1987-010-01, :on 870426,CO2 Cooling Unit Inoperable,Causing Storage Tank to Vent Into Storage Tank Room When Pressure Reached Relief Valve Setpoint.Outside Door Opened & Fire Watch Established.Call List Will Be Revised (← links)
- 05000259/LER-1986-027-01, :on 860731,control Room Emergency Ventilation Sys Fan a Observed Not Running Despite Completion of auto- Initiation Logic.Caused by Faulty Starter Coil.Suspected Starter Replaced (← links)
- 05000259/LER-1987-011-01, :on 870424,maint Personnel Discovered Valve Disks So Heavily Coated W/Hard Deposits,Valves Would Not Close & Could Not Perform Backflow Function.Caused by Inadequate Insp Program.Instructions Written (← links)
- 05000259/LER-1987-008-01, :on 870420,phase-to-phase Short Occurred in Diesel Generator Control Cabinet Contacts During Monthly Surveillance Test Performance.Caused by Failure of Potential Transformer Fuse Contacts (← links)
- 05000259/LER-1986-022-01, :on 860703,potential Safety Concern Identified During Design Review Re nonsafety-grade Air Solenoid Operators on Testable Check Valves That Could Fail.Air Supply to Solenoids Removed During Operation (← links)
- 05000259/LER-1987-007-01, :on 870409,following Calibr & Functional Test of Control Room Air Inlet Radiation Monitor,Erratic Count Observed & Subsequent Spike.Caused by Broken Terminal Lug. Connector Rewired & Replaced (← links)
- 05000259/LER-1986-035, Has Been Cancelled (← links)
- 05000259/LER-1987-001-03, :on 870127,discovered That Fire Watch Not Posted After Replacing Hose Station Valve in Reactor Bldg. Caused by Inadequate Procedure.Fire Protection Unit Developed List of Areas Requiring Fire Watch (← links)
- 05000259/LER-1986-016, :on 860418,persistent Hydraulic Fluid Leakage Problem Observed w/Bergen-Patterson Large Bore Torus Dynamic Restraint Snubbers.Study Underway by Vendor.Seal Design Suspected Problem (← links)
- 05000259/LER-1986-031-01, :on 861105,reactor Protection Sys Channel 1A Deenergized When Circuit Protector Tripped Motor Generator Set.Caused by Dirty Voltage Adjustment Potentiometer. Potentiometer Cleaned (← links)
- 05000259/LER-1986-032-01, :on 861110,instruments Used to Calibr Standby Gas Treatment Flow Switch Relays Found Out of Calibr.Caused by Tech Spec Setting Error.Relays Not Meeting Surveillance Instruction Requirements Reset (← links)
- 05000259/LER-1986-029-01, :on 860911,B&B Promatec Co Contract Personnel Erroneously Opened Bus Potential Transformer Cabinet on 4 Kv Shutdown Board,Pulling Fuses & Deenergizing Circuit. Personnel Disciplined (← links)
- 05000259/LER-1986-011, :on 860325,emergency Equipment Cooling Water Pumps A3,B3,B1 & C1 Started Unexpectedly When Hand Control Valve Closed During Pipe Maint.Caused by Operator Error & Poor Quality Drawings.Drawings Examined (← links)
- 05000259/LER-1986-010, :on 860226,engineers Discovered Seismically Unqualified Instrument Fill Lines Connected to Pressure Suppression Chamber narrow-range Water Level Monitor Ref Leg.Caused by Inadequate Design Change (← links)
- 05000259/LER-1985-051-01, :on 850925,cable Connecting Reactor Protection Sys Panel 9-17 Supply Breaker to Terminal Block Dried & Insulation Cracked.Caused by Loose Breaker Connection. Defective Cable Replaced W/Larger Gauge Cables (← links)
- 05000259/LER-1987-002-02, :on 870131,personnel Performing Relay Calibr Inadvertently Omitted Step in Procedure Causing Unexpected Actuation of Shutdown Board Undervoltage C.Fuse Replaced & Normal Power Supply Restored (← links)
- 05000259/LER-1986-034-01, :on 861209,control Room Emergency Ventilation Train a & B Initiation Occurred.Caused by Partially Inserted Check Source in Radiation Monitor 90-259B.Surveillance Instruction Performed.Monitor Returned to Svc (← links)
- 05000259/LER-1986-036-01, :on 861208,diesel Generator 1A Declared Inoperable During Performance of Monthly Surveillance Instruction,Resulting in Tech Spec Noncompliance.Caused When RHR HX Mistakenly Removed from Svc (← links)
- 05000259/LER-1988-029-02, :on 880914,discovered That Circuit Controlling Secondary Containment Isolation Dampers in Equipment Airlock Did Not Meet Single Failure Criteria.Caused by Inadequate Design Controls.Instructions Revised (← links)
- 05000259/LER-1988-025-02, :on 880909,control Room Operator Dose May Exceed Design Limits After Loca.Caused by Design Error in Original Design of Plant.Dampers Isolating Control Room Refurbished to Help Minimize Bypass Leakage (← links)
- 05000259/LER-1986-020-01, :on 860619,auto Start of Two Emergency Equipment Cooling Water Pumps Occurred.Caused by out-of- Calibr Raw Cooling Water Sys Pressure Switch.Monthly Calibrs Will Be Performed Until New Switch Installed (← links)
- 05000259/LER-1986-033-01, :on 861202,licensed Reactor Operator Received Alarms for Listed Safety Sys Actuations.Caused by Refuel Zone Ventilation Radiation Monitor Spiking to Trip Setting. Safety Sys Reset to Standby Readiness (← links)
- 05000259/LER-1986-019-01, :on 860608,11 & 13 Radiation Monitor Tripped High Actuating Standby Gas Treatment Sys Trains A,B & C & Control Room Emergency Ventilation Sys Trains a & B.Caused by Faulty Connector.Connector Replaced (← links)
- 05000259/LER-1999-001-01, :on 990115,inoperable CR Emergency Ventilation Sys During Post Maint Testing Was Noted.Caused by Failure of Procedure Writers & Reviewers.Returned a Crev to Operable State & Revised B Crev Train Procedures.With (← links)
- 05000259/LER-1986-026-01, :on 860724,mechanical Overspeed Trip of Standby Diesel Generator D Occurred.Caused by Failure of Assistant Unit Operator to Fully Lower Governor Setting to Low Speed Stop Position Prior to Start (← links)
- 05000259/LER-1986-025-01, :on 860720,during Performance of Approved Maint Activity,Battery Terminal Broke Resulting in Inoperable Smoke Detectors.Caused by Miscommunication Between Personnel.Personnel Briefed on Communication (← links)
- 05000259/LER-1986-023-01, :on 860717,during Attempt to Put Switchyard Capacitor Bank in Svc,Reactor Scram Occurred.Caused by Incomplete Closing of Switchyard Disconnect & Mechanical Failure.Retraining Course Developed (← links)
- 05000259/LER-1986-004-03, :on 851128,water Sampling Revealed Excessively High Conductivity & Chloride,Nitrate & Sulfate Concentrations.Caused by Leakage from Inner Floating Head Gaskets.Gaskets Replaced (← links)
- 05000259/LER-1986-027, :on 860731,emergency Ventilation Sys Fan Not Running Despite Completion of Auto Initiation Logic.Caused by Faulty Starter Coil Causing Overload Trips.Coil Replaced (← links)
- 05000259/LER-1985-012, :on 850405,deficiency in Standby Gas Treatment Cable Routing Discovered.Caused by Drawing Design Error. Junction Box Remounted to Meet Seismic Criteria & Design Personnel Counseled (← links)
- 05000259/LER-1988-031-02, :on 881007,Partial Group 6 Primary Containment Isolation Sys Isolation Occurred.Caused by Fuse 16AF19 Clearing.Metal Boxes Modified on 881016 to Provide Insulating plexi-glass Front Cover (← links)
- 05000259/LER-1987-005-01, :on 870303,while Performing Monthly Starting & Loading Tests for Units 1 & 2,reactor Protection Sys Motor Generator Tripped on Low Frequency.Caused by Loose Electrical Connection.Connection Repaired (← links)
- 05000259/LER-1988-033-02, :on 881004,discovered One Batch Sample to Be Included in Sept Monthly Composite Missing.Caused by Inadequate Procedures.Chemistry Procedures for Preparation of Composites Will Be Revised (← links)
- 05000259/LER-1988-030-02, :on 880923,ESFs Actuation Occurred.Caused by Inadvertent Bumping of Jumper or Grounding of Associated Relay Contacts While Working in Panel 9-42.All Work in Area Halted (← links)
- 05000259/LER-1988-032-02, :on 880914,electrical Separation Requirements Violated.Caused by Inadequate Design Controls.Discrepancies Will Be Evaluated for Impact on Sys Required to Be Operational in Refueling Mode (← links)
- 05000259/LER-1985-040, Notifies That LERs Will Not Be Prepared Using 50-259/85040 & 50-259/85042.Info Will Be Included in 50-259/85039 (← links)
- 05000259/LER-1985-039, :on 850815,local Leak Rate Test Results Exceeded Tech Specs for Msivs,Primary Containment Penetrations & Isolation Valves.Cause Not Stated.Repair & Testing Underway (← links)
- 05000259/LER-1987-003-02, :on 870220,unplanned ESF Actuation Occurred During Transfer of 4 Kv Shutdown Board C to Alternate Power Supply.Caused by Circuit Protector Opening.Operating Procedure for Board Transfers to Be Revised (← links)
- 05000259/LER-1987-004-02, :on 870221,control Room Emergency Ventilation Sys Unexpectedly Started.Caused by Assistant Shift Engineer Accidentally Moving Signal Output Cable.Engineer Counseled for Not Paying Close Attention (← links)
- 05000259/LER-1986-016-01, :on 860401,hydraulic Fluid Leakage Problem Observed w/Bergen-Patterson Large Bore Torus Dynamic Restraint Snubbers.Cause Undetermined.Vendor Conducting Study & Personnel Documenting Monthly Insps (← links)
- 05000259/LER-1986-007, :on 860219,discovered That Unistrut Space Frame Supports for CRD Insert & Withdraw Lines Not Adequately Supporting Drive Tubing During Dbe.Caused by Personnel Failure to Follow Design Typicals (← links)
- 05000259/LER-1997-004-04, :on 971010,discovered That RHR Swp LCO Is non- Conservative.Caused by Error in Preparation & Approval of Original TS 3.5.C.Will Submit TS Change to NRC to Remove non-conservatism from TS 3.5.C (← links)
- 05000259/LER-1985-057, :on 851009,determined That wide-range Torus Water Level Transmitters Not Qualified.Cause Unstated. Replacement of Existing wide-range Monitors Planned for Current Unit Outages (← links)
- 05000259/LER-1986-017-01, :on 860228,discovered Failure to Properly Torque Enclosing Tube Assembly Nut.Caused by Failure to Identify Torquing Requirements on Mfg Drawings & Route Objects.Nuts Tightened on Installed Switches (← links)
- 05000259/LER-1986-015-01, :on 860424 & 29,during Installation of Permanent Switch Protective Covers on Reactor Protection Sys (RPS) MG Panel Switches,Rps Trip Occurred.Caused by Accidental Bump of Control Switch (← links)
- 05000259/LER-1986-008-01, :on 860212,two Events Experienced Re Failure of Air Solenoid Valves,Utilized in Diesel Air Start Sys,To Fully Close.Caused by Corrosion Products Entering Valves from Air Sys Piping.Air Sys Blown Down Daily (← links)
- 05000259/LER-1997-003-01, Forwards LER 97-003-01,providing Assessment of Safety Consequences Which Was Inadvertently Omitted from Initial Rept (← links)
- 05000259/LER-1985-026, :on 850701,field Insp Determined Cable Tray Sections Not Seismically Qualified.Caused by Tray Overfill Condition.Potential Application of Alternate Seismic Approaches Re USI A-46 Considered (← links)
- 05000259/LER-1988-010, :on 880122,two Cases of Samples Required to Compensate Inoperable Effluent Radiation Monitors Missed. Caused by Inadequate Procedures.Compensatory Sample Resumed & Applicable Procedures Revised (← links)
- 05000259/LER-1988-023-03, :on 880818,ground Water Entering Pump Room Through Subterranean Pipe Penetration Observed.Caused by Efforts to Further Compact Ground for Support of Large Crane.Water Tight Seal Being Designed (← links)
- 05000259/LER-1988-042-01, :on 881029,unplanned ESF Actuation Occurred. Caused by Failure of Personnel to Ensure That Work Plan Sufficiently Addressed Effects on Plant Equipment.Work Plan Specifying ESF Actuations Revised (← links)
- 05000259/LER-1988-044, :on 881101,unplanned ESF Actuations Occurred. Caused by Normal Supply Breaker Failing to Close Due to Operator Not Holding Breaker Control Switch Fully in Close Position.Breaker Closed & Operator Counseled (← links)
- 05000259/LER-1988-045, :on 881101,secondary Containment Isolation & Unit Drywell Control Air Inboard Suction Valve Isolation Occurred.Caused by Sliding Secondary Contacts Not Being Adjusted & Not Making Contact Into Board (← links)
- 05000259/LER-1988-041-01, :on 881028,radiochemical Lab Analyst Failed to Perform Compensatory Sampling Required by Tech Spec 3.2.D Because Raw Cooling Water Effluent Radiation Monitors out-of-svc.Caused by Personnel Error (← links)
- 05000259/LER-1988-035-02, :on 881021,unplanned Actuation of Control Room Emergency Ventilation Sys Occurred.Caused by Procedural Inadequacy.Operating Instruction for Crev Revised to Describe How to Reset Initiation Logic (← links)
- 05000259/LER-1986-018, :on 860418,test Deficiencies Discovered During Review of intermediate-range Monitor Surveillance Instruction.Surveillance Procedures Will Be Rewritten to Fulfill Functional Test Requirements (← links)
- 05000259/LER-1986-013-01, :on 860422,Tech Spec Requirements for Secondary Containment Integrity in Refuel Zone Not Fully Met.Caused by Personnel Error Resulting in Improper Tagging of Damper Air Isolation Valves.Personnel Counseled (← links)
- 05000259/LER-1986-012-01, :on 860416,personnel Access Doors from Turbine Bldg Into Reactor Bldg Momentarily Open at Same Time.Caused by Proximity Switch & Latch Plate Out of Adjustment. Interlocking Mechanisms Repaired (← links)
- 05000259/LER-1988-015-02, :on 880508,failure to Perform 4 H Sample Flow Check of off-gas Stack Effluents Noted.Caused by Procedural Inadequacy & Personnel Error.Procedure SI 4.8.B.1.a.2 Will Be Revised & Lab Technician Counselled.W/Undtd Ltr (← links)
- 05000259/LER-1988-027-01, :on 880901,unplanned ESF Actuation Occurred. Caused by Procedural Inadequacy During post-mod Test.Test & RHR Svc Water Pump B1 Stopped.Procedure Revised Prior to Continuing Test.W/Undated Ltr (← links)
- 05000259/LER-1988-026-02, :on 880830,condition Adverse to Quality Rept Identified Tech Spec Violation Re Continuous Fire Watch When Fire Doors Blocked Open.Caused by Incorrect Mgt Decision. Fire Doors Closed & Mgt Directive Corrected.W/Undated Ltr (← links)
- 05000259/LER-1988-024-02, :on 880828,refueling Zone Isolation Occurred Due to Rupture of Diaphram Damper Actuator.Preventive Maint Frequency for Secondary Containment Isolation Dampers Will Be Increased to Once Every 24 Months (← links)
- 05000259/LER-1988-014-02, :on 880329,surveillance Testing of Automatic Isolation Logic of Liquid Radwaste Discharge Isolation Valves Incomplete.Caused by Inadequate Procedure. Surveillance Test Revised (← links)
- 05000259/LER-1988-022-02, :on 880720,spurious Refuel Zone Hi Radiation Causing Containment Isolation Occurred.Caused by Failure of Upscale Logic Relay Coil.Corrective Maint Initiated to Replace Relay & Radiation Monitor Tested (← links)
- 05000259/LER-1988-021-02, :on 880718,unplanned Start of RHR Svc Water Pump B1 Occurred During Monthly Operability Test.Caused by Momentary Voltage Drop to Start Logic Due to Control Power Transfer.Special Operating Instruction Revised (← links)
- 05000259/LER-1988-013-02, :on 880328,ESF Actuation Occurred.Caused by Spike on Radiation monitor,0-RM-90-259B.Event Investigated & Equipment Returned to Standby Readiness & Radio Frequency Effect on Radiation Monitor to Be Checked (← links)
- 05000259/LER-1986-024, :on 860822,determined That nonsafety-related Piping Sys Penetrating Reactor bldg-turbine Bldg Wall Not Seismically Qualified.Caused by Design Oversight.Util Will Demonstrate Plant Qualification (← links)
- 05000259/LER-1988-020-02, :on 880623,ESF Inadvertently auto-started. Caused by Personnel Error & Procedural Inadequacy.Diesel Generator D Logic Opened & Personnel Counseled (← links)
- 05000259/LER-1988-012-02, :on 880303,discovered That Battery Failure Concurrent W/Loss of Offsite Power/Loca Prevents Automatic Start of RHR Removal Pump.Caused by Design Error.Design Control Process Revised & Criteria Issued.W/Undated Ltr (← links)
- 05000259/LER-1988-019-02, :on 880608,unanticipated ESF Actuations Occurred.Caused by Jumper Falling Off While Plant Personnel Replacing Fuse.Personnel Involved Instructed to Be More Careful When Performing Functions (← links)
- 05000259/LER-1988-017-02, :on 880604,unplanned Standby Gas Treatment Actuation Occurred While Sys Being Returned to Svc Following Maint.Caused by Personnel Error.Maint Procedures Revised to Add More Detail Defining States of Mcx Relays (← links)
- 05000259/LER-1988-018-02, :on 880605,unplanned ESF Actuation Occurred Due to Circuit Protector Trip Caused by Unstable Relay Failure. Undervoltage Relay Was Unstable When Subj to Minor Vibrations.Circuit Protector Reset (← links)
- 05000259/LER-1988-005-01, :on 880122,diesel Generator & Emergency Equipment Cooling Water Pump Actuations Occurred.Caused by Personnel Error by Failing to Observe Posted Warnings & Inadequate Communication.Personnel Counseled (← links)
- 05000259/LER-1988-008, :on 880120,surveillance Instruction,Which Tests Standby Gas Treatment Relative Humidity Heaters,Failed to Meet Tech Spec Testing Requirements.Caused by Inadequate Procedures.Surveillance Instruction Revised (← links)
- 05000259/LER-1988-001-02, :on 880117,unplanned RWCU Isolation Occurred. Caused by Loose Solder Connection Found in Temp Switch. Connection Repaired & Switch Recalibr (← links)
- 05000259/LER-1988-003-01, :on 880112,four Emergency Equipment Cooling Water Pumps Inadvertently Started Due to Procedure Deficiency.Caused by Inadequate Instruction for Raw Cooling Water (Rcw) Sys.Rcw Pumps Returned to Svc (← links)
- 05000259/LER-1987-014, :on 870708,engineers Measured Flow Rates in Excess of Design Basis Flow Rate.Throttle Dampers on Two Control Room Emergency Ventilation Units Unset Since Sys Installation.Procedures Revised (← links)
- 05000259/LER-1988-011-02, :on 880304,three Emergency Equipment Cooling Water Pumps Inadvertently Started Due to Pressure Drop in Raw Cooling Water Sys.Caused by Personnel Error in Not Performing Valve Lineup.Personnel Counseled (← links)
- 05000259/LER-1988-006-02, :on 880220,unplanned ESF Actuation Occurred Due to Personnel Error.Caused by Procedural Inadequacies & Human Factor Concerns.Personnel Involved Counseled on Necessity of Exercising Extreme Caution W/Equipment (← links)
- 05000259/LER-1988-009-01, :on 880202,standby Gas Treatment Train Actuation Occurred.Caused by Latching Relay in Train Control Logic.Investigation by Maint Organization Initiated & Logic Inspected & Found to Be Operating Properly (← links)
- 05000259/LER-1986-005, :on 860210,control Room Emergency Ventilation Sys Trains a & B Actuated on High Radiation Alarm from Detector RM-90-259A.Caused by Cracked Internal Calibr Source Motor Mounting Bracket.Bracket Repaired (← links)
- 05000259/LER-1985-045, :on 850904,during Performance of Technical Instruction-33,emergency Equipment Cooling Water Flow Verification Found Inadequate.Possibly Caused by Silt Accumulation,Biofouling & Corrosion (← links)
- 05000259/LER-1986-009, :on 860226,inadvertent Secondary Containment Occurred Due to Instrument Mechanics Placing Jumper Across Terminal Points CC-38 & CC-40 to Bypass Relay 16A-K61A. Caused by Personnel Error.Personnel Cautioned (← links)
- 05000259/LER-1985-052, :on 850924,fuse Labelling Discrepancies Found in Variations of Fuse Amp Rating,Fuse Type & Class & Fuse Block Type.Caused by Lack of Comprehensive Fuse Control Program.Fuse Control Procedure Established (← links)
- 05000259/LER-1985-014, :on 850405,19,22,0501 & 24,while in Refueling/ Maint Outage,Diesel Generator & Shutdown Board Battery Racks Found Unqualified.Caused by Installation Errors.Racks Modified & Design Drawings Revised (← links)
- 05000259/LER-1985-044, :on 850819,plant Personnel Discovered Seven Nails Installed on Main Steam Line Axial Support Tie Rod Pins Instead of 3/8-inch Stainless Steel Cotter Pins.Cotter Pins Installed (← links)
- 05000259/LER-1985-055, :on 851122,during Maint Activities,Spare Sleeve Penetration in Fire Barrier Found Unsealed.Caused by Concealed Location Above Suspended Ceiling.Penetration Sealed (← links)
- 05000259/LER-1985-050, :on 851003,during Review of Surveillance Requirements,Determined Several Instrument Surveillances Not Performed Per Tech Specs.Caused by Failure to Implement Plant Procedures (← links)
- 05000259/LER-1985-048, :on 850908,inadvertent Scram Occurred During Performance of Surveillance Instruction Aprms.Computer Logs Indicated Half Scram on Reactor Protection Sys from Previously Tested APRM Channel (← links)
- 05000259/LER-1985-053, :on 851118,during 10CFR50,App J Review, Determined That Valve Packing on HPCI Turbine Exhaust Valve, RCIC Turbine Exhaust Valve & Turbine Condenser Vacuum Pump Discharge Valve Not Checked (← links)
- 05000259/LER-1985-049, :on 850623,determined That Weld Repair Procedure Used to Repair Diesel Generator Battery Rack Stud Not Suitable for Welding of ASTM A-307 Matls.Studs Installed (← links)
- 05000259/LER-1985-029, :on 850628,discovered Deficiency in Procedural Controls Re Operation of Charcoal Heaters.Cause Not Stated. Heaters on All Three Trains Tagged Out Until Permanent Removal (← links)
- 05000259/LER-1986-001-02, :on 860107,effluent Exhausted to Main Stack W/Monitoring Channel Partially Operable.Caused by Lack of Communication Between Unit Operators & Support Personnel. Personnel Counseled (← links)
- 05000259/LER-1985-043, :on 850825,during Performance of Surveillance Instruction on Aprm,Full Scram Inadvertently Occurred. Possible Causes Include Low Scram Header Pressure & APRM Equipment Failure.Aprm Bypass Switch Replaced (← links)
- 05000259/LER-1997-002-02, :on 970314,inadequate CREVS Surveillance Instruction Was Identified During GL 96-01 Review.Caused by Deficient Procedure.Rev to O-SI-4.2.G-2 Was Made & SI Section Was Successfully Completed (← links)
- 05000259/LER-1985-038, LER Will Not Be Prepared Under 50-259/85038.Info to Have Been Included in Rept Incorporated as Rev to BFRO-50-259/85036 R1 (← links)
- 05000259/LER-1997-001-03, :on 970203,potential Overpressurization Containment Penetration Pipe Occurred Due to Thermal Expansion of Entrapped Water Was Identified.Plant Procedures Will Be Revised (← links)
- 05000259/LER-1979-016-03, /03L-0:on 790804,during Normal Operation,Starter Bus 1B Normal Feeder Breaker Found Discharged,Making Breaker Inoperable for Closure.Caused by Damaged Breaker Spring Charging Motor Commutator.Motor Replaced (← links)
- 05000259/LER-1985-032, :on 850620,discovered Possibility for short-term Transient Voltage to Drop 3 Volts Less than FSAR Specified Value of 210-volt Dc.Undervoltage Trip Setting on Inverters Lowered (← links)
- 05000259/LER-1985-023, :on 850613,partial Containment Isolation Occurred Due to Loss of Relay Neutral.Caused by Temporary Jumper Slipping Off Relay Neutral During Replacement of Defective Relay.Dislodged Jumper Reconnected (← links)
- 05000259/LER-1985-037, :on 850718,during Refueling Outage,Inadevertent Containment Isolation Occurred When Wire Pinched & Shorted to Ground.Caused by Defective Relay.Relay Replaced (← links)
- 05000259/LER-1985-035, :on 850710,high Radiation Alarm Experienced Due to Radiation from Moisture Separator.Instructions for Vessel Internals Being Revised (← links)
- 05000259/LER-1985-031, :on 850706-09,engineering Reviews Revealed Flanged Joints on Water Recirculation,Air Release,Pressure Reducing & Water Regulator Valves.Caused by Failure to Specify Flange Types (← links)
- 05000259/LER-1985-030, :on 850705,deficiency Found in Testing Requirements for Primary Containment Isolation Valves 1-55 & 1-56.Caused by Tech Specs Not Being Revised.Status of Valves Changed to Normally Open (← links)
- 05000259/LER-1985-028-01, :on 850706,standby Gas Treatment Sys Train C Declared Inoperable.Caused by Failure of Charcoal Bed Heater High Temp Cutout Switch.Defective Switch Replaced & Train C Returned to Svc (← links)
- 05000259/LER-1985-046, :on 850912,chemical Lab Technician Left Continuous Air Monitor Sample Hose to Turbine Bldg Ventilation Continuous Air Monitor Disconnected.Technician Disciplined.Procedure Will Be Revised (← links)
- 05000259/LER-1985-026-01, :on 850701,cable Trays Found to Be Excessively Loaded & Not Properly Qualified Seismically.Caused by Continual Mods Requiring Addition of Fire Retardant to Cables & Design Interface Problems (← links)
- 05000259/LER-1985-036, :on 850626,during Evaluation,Discovered That Addl RCIC & HPCI Sys Isolation Valves Not Local Leak Tested (Type C) Per 10CFR50,App J.Caused by Incomplete App J Program.Valves Added to Program (← links)
- 05000259/LER-1985-024-01, :on 850612,inadvertent Isolation Signal Initiated Due to Blown Fuse in Primary Containment Isolation Sys Circuitry.Caused by Relay Coil Failure.Coil & Fuse Replaced (← links)
- 05000259/LER-1985-041, :on 850814,sys Operational Readiness Reviews Determined That Manufacturer multi-yr Diesel Generator Insp Recommendations Not Implemented.Cause Unknown.Vendor Recommendations Will Be Evaluated (← links)
- 05000259/LER-1985-034, :on 850629,discovered That 850122 Charcoal Sample Not Shipped Offsite for Vendor Analysis.Sample Lost. Administrative Controls Prepared to Add More Assurance That All Samples Properly Handled (← links)
- 05000259/LER-1985-027, :on 850620,design Evaluation Indicated Deficiency Re Inadequate Seismic Design of Reactor Bldg Crane.Mod Planned for Completion by 851031 to Replace Crane Rail Clamps W/Larger Size (← links)
- 05000259/LER-1985-025-01, :on 850605,fuel Pool Cooling Pump 1A Discharge Flange Cracked During Torquing.Caused by Joint Design Not Meeting ANSI Requirements.Pump Casing Replaced.Mating Pipe Flange to Be Modified (← links)
- 05000259/LER-1985-022, :on 850610,containment Isolation Occurred When Reactor Protection Sys Bus Transferred to Alternate Source. Plant Instruction Did Not Address Potential for Isolation During Transfers.Instruction Revised (← links)
- 05000259/LER-1985-021-01, :on 850604,primary Containment Isolation Occurred.Caused by Undetected Blown Fuse.Fuse Replaced.On 850605,containment Isolation Occurred.Caused by Relay K-1 Contact Failure (← links)
- 05000259/LER-1985-015-01, :on 850501,while Attempting to Adjust Reactor Cooling Flow by Throttling RHR Loop II Pump Discharge Valve Operation Observed No Indication of Valve Movement.Caused by Shorn Gear Assembly Spline Teeth (← links)
- 05000259/LER-1985-008, :on 850318,HPCI & RCIC Turbine Exhaust Valve Flanged Bonnets Not Local Leak Tested in Accordance w/10CFR50,App J Requirements.All Valves Will Be Repaired & Pass Leak Test (← links)
- 05000259/LER-1985-023-01, :on 850613,partial Containment Isolation Occurred When Temporary Jumper Slipped Off Relay Neutral During Replacement of Defective Relay.Dislodged Jumper Reconnected & Isolation Reset (← links)
- 05000259/LER-1985-013-01, :on 850418,util Ofc of Engineering Determined That Existing Configuration of Startup Test Instrumentation Panels Cannot Be Determined to Be Seismically Qualified. Caused by Improper Mounting of Panels (← links)
- 05000259/LER-1992-006-04, :on 921230,CREV Sys Train B Declared Inoperable Upon Determination That Required Surveillance Testing Not Performed After 921129 Maint.Required Surveillance Testing Initiated (← links)
- 05000259/LER-1985-014-01, :on 850419,diesel Generator Racks & Shutdown Board Battery Rack 3EB Discovered to Be Seismically Unqualified.Caused by Installation Deficiency.Racks Modified to Meet Design Requirements (← links)
- 05000259/LER-1985-019-01, :on 850523,during Routine Flushing of Fire Protection Strainers,Low Pressure on High Pressure Fire Protection Sys Header Noted.Caused by Sys Isolation Header Valves Being Left Closed After Maint Repair (← links)
- 05000259/LER-1985-020, Canceled (← links)
- 05000259/LER-1992-005-04, :on 921211,air Flow Detected from Secondary Containment Through 4-inch Raw Cooling Water Vent Pipe to Condenser Circulating Water Discharge Culvert.Caused by Design Deficiency.Isolation Valve Closed (← links)
- 05000259/LER-1985-017-01, :on 850514,design Evaluation Determined That Accident Radiation Levels Would Exceed Failure Threshold Teflon Use in Listed Whitney H202 Analyzer Valves Procured from Milton Roy Co.Design Change Issued (← links)
- 05000259/LER-1985-018-01, :on 850517,discovered Explosive Bolts on Reactor Zone to Refuel Floor Relief Panels Replaced W/Std Bolts & Nuts.Reactor to Refuel Floor Hatch Covers Removed & Mechanical Maint Instruction 14 Revised (← links)
- 05000259/LER-1985-011-01, :on 850411,control Circuit Fuse Blew,Causing Partial Initiation of Primary Containment Isolation Sys. Caused by Failure of Relay 16AK72 Coil.Coil Replaced.New Fuse Installed.Recurrence Control Not Required (← links)
- 05000259/LER-1985-012-01, :on 850408,discovered Standby Gas Treatment Sys Divisional Cables Routed Through Fire Stop/Pressure Seals Using Spare Cables Designated for nonsafety-related Use. Junction Box Also Determined Seismically Unqualified (← links)
- 05000259/LER-1985-010-01, :on 850403,following Upscale Alarm of CAM-1-90-250,chemical Analyst Failed to Continue CAM Hourly Sampling Per Surveillance Instruction 4.8.B.1.a.Caused by Personnel Error.Personnel Given Addl Training (← links)
- 05000259/LER-1984-022, :on 840512,determined That Necessary Cooling Equipment for Some Electrical Board Rooms Could Be Lost During Loca.Caused by Design Oversight on Load Shed Logic. Mods Scheduled (← links)
- 05000259/LER-1985-009-01, :on 850322,analysis of Primary Containment Isolation Sys Circuitry Revealed That Combination of Switches Could Lead to Failure of Listed Sys to Function. Caused by Design Oversight (← links)
- 05000259/LER-1985-008-02, :on 850315,discovered Listed Valves Not Local Leak Tested.Caused by Failure to Identify Valves Per 10CFR50.Two Valves Failed Subsequent Test & Unit Manually Scrammed.Two Other Valves to Be Modified (← links)
- 05000259/LER-1985-007-02, :on 850318,handswitch Used for Purging Plant Stack Radiation Monitor Left in on Position,Allowing 2 H Unmonitored Release.Caused by Personnel Error.Switch Turned Off.Individual Reprimanded (← links)
- 05000259/LER-1992-004-03, :on 920914,CR Ventilation Isolation Occurred When Both Crev Trains Inadvertently Tripped.Caused by Spike on Control Room Ventilation Monitor.Work Request Initiated to Investigate Spike on Monitor (← links)
- 05000259/LER-1984-038-01, :on 841219,RCIC Turbine Failed to Respond Above 2,100 Rpm.Cause Not Stated.Rcic Ramp Generator & Signal Converter Replaced (← links)
- 05000259/LER-1992-003-03, :on 920626,RPS Bus B de-energized Causing Actuation of Several Esfs.Caused by 1B2 Circuit Protector Trip.Rps Bus B Transferred to Alternate Power source.1B1 & 1B2 Circuit Protectors Also Being Monitored (← links)
- 05000259/LER-1985-004-03, :on 850223,generator End of LPCI Motor Generator 1EA Found Overheated.Caused by Diode Failure Due to Vibration of Rectifier Ring.Phenolic Coil Clamps Replaced & Rectifier Rings Tightened (← links)
- 05000259/LER-1996-003-03, :on 960403,Unit 2 Received Unplanned ESF Actuation.Caused by Electrician Introduced Fault Into ECCS Logic While Preparing Wires for Termination in Panel 2-9-81. Problem Evaluation Rept Initiated (← links)
- 05000259/LER-1996-002-02, :on 960328,EDG auto-started Due to Undervoltage Condition as Result of Personnel Error.Functional Tests on Breakers Associated W/Shutdown Bus Stopped & EDG Shutdown & Placed in Standby Readiness (← links)
- 05000259/LER-1985-002-03, :on 850124,all Eight Diesel Generators & Core Spray Pumps 3A & 3C Started During Performance of Core Spray Logic Functional Surveillance Instruction.Caused by Personnel Error.Personnel Cautioned (← links)
- 05000259/LER-1985-001-02, :on 850121,unidentified Drywell Leakage Rate in Excess of Tech Spec,Noted.Shutdown Initiated.Caused by Leak in Temporary Hose & Weld Crack Inside Drywell.Repairs Made & Pertinent Procedures Revised (← links)
- 05000259/LER-1984-012, :on 840214,alert Declared.Caused by Unavailability of Shutdown Cooling Sys Due to Failure of Phase B Winding of Motor on Valve FCV-74-48.Alert Canceled After Valve Opened Manually.Shutdown Restored (← links)
- 05000259/LER-1984-037-01, :on 841114,nine Wires in Reactor Protection Sys Not Run in Conduit.Caused by Unclear Notation &/Or Misinterpretation of Note on Panel Drawings.Fire Watch Established.Wires Installed in Conduit (← links)
- 05000259/LER-1992-002-05, :on 920324,reactor Protection Sys Experienced Unexpected Failure,Causing Actuation of Esf.Cause Not Determined.Bus 1B Placed on Alternative Power,Alarms Reset & ESF Actions Returned to Normal (← links)
- 05000259/LER-1985-006-02, :on 850304,during Performance of HPCI Sys Motor Operated Valve Operability Surveillance Instruction 4.5.E.1.c,HPCI Inverter Fuse Cleared.Caused by Blown Inverter Fuse.Fuse Replaced (← links)
- 05000259/LER-1996-001-01, :on 960121,Unit 1/2 B DG Auto Started During Local Panel Testing.Caused by Failure of Blocking Diode in Start Failure Circuitry.Failed Diode Replaced & Panel Alarm Pushbutton Annuciation Circuitry Checked (← links)
- 05000259/LER-1985-005-03, :on 850227,during HPCI Sys Surveillance Testing,Time to Reach Rated Flow 2 Longer than Surveillance Instruction Spec of 25 S.Caused by Inadvertent Closing of Ball Valve on Turbine Hydraulic Sys (← links)
- 05000259/LER-1985-001-01, :on 850121,drywell Leakage Rate in Excess of Tech Specs Noted.Caused by Leak in Temporary Hose Used to Test Check Valve & Small Weld Crack Inside Drywell.Crack Repaired.Procedures Revised (← links)
- 05000259/LER-1985-003-03, :on 850205,diesel Generators C & D Inadvertently Started.Caused by Voltage Spike Trip Causing Cooling Tower Transformer Overpressurization Relays to Operate.Caution Signs Posted (← links)
- 05000259/LER-1984-032-01, :on 840814,during Core Spray Logic Test, Solenoid Which Controls Air to Actuator of Inboard Isolation Valve Caused Actuator to Hold Check Valve in Open Position. Caused by Personnel Error.Solenoid Repaired (← links)
- 05000259/LER-1984-033-01, :on 840815,onsite GE Representative Notified Util That Installed Squib Cartridges on Traversing in-core Probe Shear Valves Possibly Defective.Probes Pulled Into Shields & Ball Valves Closed (← links)
- 05000259/LER-1984-021, :on 840505,cabling for Main Steam Relief Valves Assigned to Automatic Depressurization Sys Determined Not Adequately Separated from Cabling for Nonautomatic Depressurization Sys.Design Change Initiated (← links)
- 05000259/LER-1992-002, :on 920424,unit 1 Reactor Protector Sys Experienced an Unexpected Failure,Causing Actuation of Plant Esf.Cause Could Not Be Identified.Sys Placed on Alternative Power & Alarms Reset (← links)
- 05000259/LER-1984-027, :on 840627,main Steam Relief Valve Lifted & Leaked.Unit Manually Scrammed & Valve Replaced.Testing of Valve Revealed No Electrical/Mechanical Anomalies.No Further Action Necessary (← links)
- 05000259/LER-1984-031-01, :on 840727,RHR Svc Water Pump D2 Not Demonstrated Operable Immediately When Pump D1 Removed from Svc.Caused by Personnel Error.Equipment Proven Operable. Associated Personnel Reinstructed (← links)
- 05000259/LER-1984-029-01, :on 840720,24 H Limiting Condition for Operation Entered When ASME Section XI Pump Pressure Criteria Not Met for Four RHR Svc Water Pumps.Tech Spec Flow Met,But Pumps Declared Inoperable (← links)
- 05000259/LER-1984-026, :on 840620,unidentified Drywell Leakage Exceeded Tech Spec Coolant Leakage Rate of 5 Gpm.Orderly Shutdown Initiated & Unit Manually Scrammed at 59% Power. Seal Replaced (← links)
- 05000259/LER-1984-028-01, :on 840710,automatic Discharge Transfer Logic for HPCI from Discharging to Condensate Storage Tanks to Reactor Vessel Failed.Caused by Dirty Contact on Limit Switch.Contact Cleaned (← links)
- 05000259/LER-1984-023, :on 840518,during Replacement of Failed Relay 16AK20,adjacent Internal Panel Wire Supplying Power to Primary Containment Isolation Valves Came Loose.Caused by Wire Incorrectly Terminated (← links)
- 05000259/LER-1984-036-01, :on 840929,RCIC Controller Declared Inoperable. Caused by RCIC Sys Failing to Properly Respond to Manual Control Signals.Rcic Ramp Generator & Signal Converter Replaced (← links)
- 05000259/LER-1984-027-01, :on 840627,during Startup & at 1% Power & Rated Pressure,Main Steam Relief Valve Began to Unseat,Causing Torus Temp to Approach Limits.Unit Manually Scrammed.Cause Unstated.Valve Replaced & Unit Restarted (← links)
- 05000259/LER-1984-022-01, Updated LER 84-022-01:on 840212,investigation Determined That Single Failure or LOCA & Loss of Offsite Power Could Cause Equipment Necessary for Electrical Board Room Cooling to Be Lost.Caused by Design Oversight (← links)
- 05000259/LER-1984-030-01, :on 840928,block Walls in Control Bay & Reactor Bldg Identified to Have Higher Load Requirements than Calculated,Based on New Tornado Depressurization Analysis.Procedures Revised (← links)
- 05000259/LER-1984-035-01, :on 840921,during Performance of Surveillance Instruction 4.2.B-45A,Loop II RHR Pump Inadvertently Started.Caused by Typo in Pump Actuation on Relay Number in Instruction.Instruction Corrected (← links)
- 05000259/LER-1984-025-01, :on 840615,review of Bldg Heat Sys During IE Bulletin 79-14 Insp Determined That Isolation Between Turbine & Reactor Bldg Heat Sys Lines Inadequate.Caused by Failure to Follow Design Criteria (← links)
- 05000259/LER-1984-034-01, :on 840829,Engineering Design Determined 12 Fire Doors Reduced in Structural Integrity.Caused by Maint & Mods to Door & Door Frames.Old Doors Will Be Replaced. Roving Fire Watch in Force (← links)
- 05000259/LER-1984-024-01, :on 840602,increase in Conductance of Stator Cooling Water Teflon Insulating Connector Tubing Caused Turbine Generator Trip.Probably Caused by Interior Deposits of Iron & Copper.Sys Flushed (← links)
- 05000259/LER-1984-023-01, :on 840518,internal Panel Wire Supplying Power to Primary Containment Isolation Sys Valves Came Loose Giving Intermittent Signals.Caused by Incorrectly Terminated Wire.Wire Reterminated (← links)
- 05000259/LER-1984-021-01, :on 840505,cabling for Main Steam Relief Valves Not Adequately Separated from Cabling for Nonautomatic Depressurization Sys Main Relief Valves.Caused by Design Error During Recovery from 1975 Fire (← links)
- 05000259/LER-1984-020-01, :on 840505,discovered That Paralleling Units 1 & 2 Diesel Generators W/Unit 3 Generators in Presence of Accident Signal Not Possible.Caused by Error in App R Analysis Review.Mod Expected by 840815 (← links)
- 05000259/LER-1992-002-02, :on 920302,unplanned ESF Actuations Occurred, Resulting from Short in Indicating Light Socket.Caused by Adequate Design Requirement.Esfs Reset to Normal Configuration (← links)
- 05000259/LER-1984-026-01, :on 840620 & 19,unidentified Drywell Leakage Exceeded 5 Gpm Reactor Coolant Rate.Seal Assembly Disassembled to Determine Cause.Orderly Shut Down Initiated. Seal Replaced & Returned to Svc (← links)
- 05000259/LER-1984-018-01, :on 840320,following RCIC Steam Leak Repair, Inboard MSIV Would Not Open.Caused by High Pressure Differential Across Valve Disc.Valve Opened When Pressure Equalized (← links)
- 05000259/LER-1984-016-01, :on 840229,while at 95% Power,During Installation of Ground Connector on Reactor Protection Panel 25-6B,w/common Leg to Panel 25-183,unit Scrammed. Caused by Vibration During Installation (← links)
- 05000259/LER-1984-014-01, Updated LER 84-014-01:on 840222,reactor Scrammed When Turbine High Pressure First Stage Pressure Exceeded 142 Psig W/Turbine Stop Valves Closed.Caused by Procedural Error. Operating Instruction Revised (← links)
- 05000259/LER-1984-014, :on 840222,reactor Scrammed When Turbine High Pressure First Stage Pressure Exceeded 142 Psig W/ Turbine Stop Valves Closed.Caused by Procedural Error. Operating Instruction Will Be Revised (← links)
- 05000259/LER-1984-012-01, :on 840214,RHR Valve FCV-1-74-48 Failed to Open,Making Normal Method Cold Shutdown Impossible to Achieve.Possibly Caused by Failure of Phase B Motor Winding. Next Rept Will Be Submitted by 840901 (← links)
- 05000259/LER-1984-011-01, :on 840209,during Routine Surveillance Testing, Automatic Scram Initiated.Caused by Failure of MSIV Dc Solenoid.Failure Considered Random Event.Solenoid Coils Checked Weekly for Operability (← links)
- 05000259/LER-1984-008-01, :on 840129,during Normal Operation,One or More Pressure Differential Transmitter Instrumentation 1-25A Through D Failed in Downscale Direction,Causing Trouble Alarm.Cause Unknown.Instruments Recalibr (← links)
- 05000259/LER-1995-001-04, :on 950629,EECW Pump Auto Started During Performance of SI as Result of Jumpering Wrong Relay Contacts Due to Personnel Error.Field Wiring for EECW Pump B1 Modified (← links)
- 05000259/LER-1983-029-03, During Standby Gas Treatment Sys Operability Test,Train B Discovered Inoperable.Caused by Erratic Mcdonnel & Miller Model AF-1 Flow Switches.Damper Adjusted.W/Undated Ltr (← links)
- 05000259/LER-1984-002, LER BFRO-50-259/84006 Will Not Be Used.Event Being Combined W/Ler 50-296/84002 (← links)
- 05000259/LER-1983-052-03, /03L-0:on 830912,while Performing Surveillance Instruction 4.11.C.3 & 4 on Reactor Bldg Elevation 593 Fixed Spray Zone 1E Heat Detector Relay Discovered Inoperable. Caused by Random Failure.Relay Replaced (← links)
- 05000259/LER-1950-259-762, /762:on 760204,design Deficiency Found While Investigating LPCI Loop Selection Logic.Final Rept Will Be Submitted Per 10CFR50.55(e) (← links)
- 05000259/LER-1950-259-763, /763T:on 760213.Condition Determined Not to Be Ro (← links)
- 05000259/LER-1991-008-02, :on 910724,fire Wrap Discovered Removed During Unit 3 Integrated Walkdown Activities W/O Establishing Fire Watch.Caused by Mgt Failure.Duties,Responsibilities & Accountabilities for Field Svcs Developed (← links)
- 05000259/LER-1984-019-01, :on 840329,incorrect Tech Spec Wording for Measuring Battery Cell Temp Discovered.Tech Spec Rev,To Require Pilot Cell Temp to Be Taken Instead of Adjacent Cell,Submitted (← links)
- 05000259/LER-1982-101-03, /03L-0:on 821229,offgas post-treatment Radiation Monitor L-RM-90-265 Failed in Downscale Tripped Condition. Caused by Failed 15-volt Regulator (GE 194X36361).Regulator Replaced & Monitor Returned to Svc (← links)
- 05000259/LER-1984-004-01, Updated LER 84-004-01:on 840106,reactor Mode Switch Moved from Run to Startup,Causing Half Scram.Caused by Personnel Error.Unit Manually Scrammed.Operator & Nuclear Engineer Counseled Re Use of Rod Notch Override (← links)
- 05000259/LER-1984-017-01, :on 840313,routine Functional Check for Radiation Monitor RM-90-259,which Monitors Control Room Air Supply Duct,Not Performed within Tech Spec Limits.Caused by Personnel Error.Incident Discussed W/Personnel (← links)
- 05000259/LER-1991-009-02, :on 910824,fire Penetration Discovered Open W/O Fire Watch in Place as Required by Plant Tech Specs. Caused by Inappropriate Personnel Action.Personnel Will Be Trained on Event (← links)
- 05000259/LER-1983-065-03, /03L-0:on 831107,high Water Level Surveillance in Scram Discharge Tank Not Performed in Compliance W/Tech Spec Table 3.1.A.Caused by Failure to Include Surveillance Instruction in Master Schedule (← links)
- 05000259/LER-1983-063-03, /03L-0:on 831102,flow Distribution Through Standby Gas Treatment Train B Failed Acceptance Criteria.Caused by Accumulation of Sand in Moisture Separator.Moisture Separator Repaired (← links)
- 05000259/LER-1983-060-03, /03L-0:on 831018,containment Atmosphere Dilution Tank a Nitrogen Level Decreased to Below 74% Full.Caused by Leaks in Velan Valves.Vendor Requested to Replenish Lost Nitrogen Vol on 831017 (← links)
- 05000259/LER-1983-028-03, Stack Gas Radiation Monitors RM 90-147 & RM 90-148 Inoperable Due to Failure of Sample Pumps a & B.Caused by Broken Glass Oil Filter Bowl on Pump a & Buildup of Dirt & Grit in Pump B (← links)
- 05000259/LER-1983-058-03, /03L-0:on 831007,during Emergency Cooling Water Pipe Replacement,Check Valve 1-67-660,Daniels Series 1600, Discovered Installed Backwards.Sys Modified W/New Piping & Valves (← links)
- 05000259/LER-1991-004-01, :on 910419,pumps Unexpectedly auto-started During Performance of Surveillance Instruction Re Common Accident Signal Logic.Caused by Personnel Error.Assistant Unit Operator Counseled (← links)
- 05000259/LER-1983-056-03, /03L-0:on 831003,radiochemical Lab Personnel Discovered Inlet Sample Hose CAM O-90-252 (Common) Disconnected.Caused by Personnel Moving Hose for Unknown Reasons.Sample Hose Reconnected (← links)
- 05000259/LER-1983-054-03, /03L-0:on 830927,review of Records Indicated That During 7 Months Prior to Shutdown,Addl Samples Required by Tech Spec 4.6.B.6 Not Taken.Caused by Lack of Administrative Controls (← links)
- 05000259/LER-1983-055-03, /03L-0:on 830901,discovered Core Spray Test Bypass Valves FCV-75-22 & 50 Not Tested During Aug.Caused by Missing Test When Core Spray Sys Slow Test Frequency Changed to Quarterly.Operability Test Revised (← links)
- 05000259/LER-1984-013-01, :on 840213,air & Vacuum Release Valves Found Underrated for Surge Check Valve Svc Application.Caused by Misapplication of Valve.New Valves,W/Proper Design & Pressure Rating,Installed (← links)
- 05000259/LER-1984-007-01, Followup LER 84-007-01:on 840127,operator Observed Decreasing Pressure on Control Atmospheric Dilution Tanks. Caused by Two Isolation Valves Being in Closed Position. Operating Instructions Revised (← links)
- 05000259/LER-1984-010-01, :on 840203,operator Observed hydrogen-oxygen Analyzer B Isolated.Caused by Faulty Group 6 Isolation Relay Signal.Signal Reset & Hi & Low Relays Replaced (← links)
- 05000259/LER-1984-009, :on 840130,factor Kf Used in Critical Power Ratio Calculations by Process Computer in Error by Approx 2.5% at Recirculation Flows of Approx 75%.Caused by Loading Core Dump Generated Prior to Factor Correction w/840217 Ltr (← links)
- 05000259/LER-1984-005-01, :on 840122,during Surveillance Testing, Setpoints for Pressure Switches PS-64-56B & C Not within Tech Spec 3.2.A Limits.Caused by Setpoint Drift.Procedures Revised (← links)
- 05000259/LER-1983-051-03, /03L-0:on 830824,during Refueling,Continuous Air Monitor 1-90-250 Declared Inoperable Due to Broken Drive Belt.Caused by Normal Wear Due to Continuous Operation.Belt Replaced (← links)
- 05000259/LER-1984-003-01, :on 840117,during Testing of Standby Gas Treatment (SBGT) Trains,One of Three Trains Had Flow Below Design Due to Misadjusted Discharge Dampers on Trains a & C. Cause of Misalignment Unknown (← links)
- 05000259/LER-1983-071-03, /03L-0:on 831212,analyst Discovered Broken Vacuum Pump Belt on Reactor & Turbine Vent Monitor 1-RM-90-250. Caused by Normal Wear Due to Continuous Operation.Std V-belt for Schwitzer Model 325 Air Pump Replaced (← links)
- 05000259/LER-1984-003, :on 840117,one of Three Standby Gas Treatment Trains Had Flow Below Design.Caused by Manual Discharge Dampers on Trains a & C Being Off Marked Positions.Dampers Returned to Proper Positions (← links)
- 05000259/LER-1983-050-03, /03L-0:on 830815,while Performing Surveillance Instruction 4.2.B-45,relay 10A-K34A Found to Operate at 8.2 & Relay 10A-K75B Found to Operate at 25.87 S.Caused by Setpoint Drift.Relays Recalibr (← links)
- 05000259/LER-1983-046-03, /03L-0:on 830726,during Routine Insp,Inspector Noted Standby Gas Treatment Train B Inoperable.Caused by Type Thed 136090 GE Molded Case Breaker Tripping.Breaker Reset (← links)
- 05000259/LER-1983-049-01, /01T-0:on 830811,while Performing Ultrasonic Insp of Core Spray,Rhr Head Spray & Reactor Water Cleanup Piping, crack-like Indications Detected & Confirmed on Welds.Caused by Intergranular Stress Corrosion Cracking (← links)
- 05000259/LER-1983-043-03, /03L-0:on 830716,control Room Emergency Ventilation Sys Unit B Control Arm on Damper Fco 31-152 Found Disconnected.Caused by Loose Control Arm to Damper Nut.Nut Tightened & Arm Reconnected (← links)
- 05000259/LER-1983-045-03, /03L-0:on 830713,insp Revealed Failure of Coupling on Lube Oil Circulating Pump on Diesel Generator 1A.Caused by Wear from Normal Svc.Procedure Changed to Require Annual Changeout (← links)
- 05000259/LER-1984-004, :on 840106,during Manual Shutdown of Main Turbine,Control Rods Inserted to Reduce Power.Reactor Mode Switch Moved from Run to Startup,Resulting in Half Scram. Caused by Personnel Error.Personnel Counseled (← links)
- 05000259/LER-1983-072-03, /03L-0:on 831227,mean Sea Level Wind Speed Recorder XR-90-104 Read Zero.Caused by Ice Formation on Wind Speed Sensor (← links)
- 05000259/LER-1983-019-03, /03L-0:on 830410,smoke Detector XS-39-66XM Alarmed Due to Leakage of Water Into Detector.Source of Water Not Determined.Detector Replaced & Will Be Relocated to Avoid Leakage (← links)
- 05000259/LER-1984-002-05, :on 840103,setpoint Value of Pressure Switches PS-64-57A-D Found Above Tech Spec 3.2.B. Limits.Caused by Static O-ring Model 12N-AA4 Setpoint Drift.Switches Recalibr.Surveillance Test Revised (← links)
- 05000259/LER-1983-005-03, /03L-0:on 830126,trouble Alarm Sounded for Control Bay Elevation 593 Fire Protection Panel 1-25-325,Zone 14. Caused by Power Loss to Some of 16 Smoke Detectors.Broken Nylon Insulating Screw Caused Detector to Short Circuit (← links)
- 05000259/LER-1984-001, :on 840103,RHR Pump 1D Started W/O Receiving Automatic Signal or Manual Start Signal from Control Room. Caused by Laborers Performing Decontamination Work.Laborers Cautioned (← links)
- 05000259/LER-1983-002-03, /03L-0:on 830117,during Surveillance Insp,Control Rod 10-39 Failed to Operate at Position 46.Probably Caused by Crud Accumulation in Valve Flow Orifice.Insert Directional Control Valve Replaced (← links)
- 05000259/LER-1983-074-03, /03L-0:on 831228,during Refueling,Degraded Flow Condition Discovered on Radiation Monitor 1-RM-90-250. Caused by Normal Wear & Degradation of Schwitzer Series 325 Sample Pump.Pump Replaced (← links)
- 05000259/LER-1983-073-01, /01T-0:on 831231,reactor Coolant Sample Indicated Chloride Concentration of 525 Ppb & Conductivity & Offgas Radiation Level Increased While Ph Decreased.Caused by Resin Intrusion Into Reactor Vessel.Trap Replaced (← links)
- 05000259/LER-1982-098-03, /03L-0:on 821205,0-90-252 Radwaste Continuous Air Monitor Taken Out of Svc for 7.5 H to Repair Particulate Detector.Caused by Torn Mylar Film Covering Detector.Mylar Film Replaced (← links)
- 05000259/LER-1982-096-01, /01T-0:on 821206,during Startup,Control Rod 18-51 Double Notched from 08 to 12,resulting in Large Reactivity Insertion & Causing Reactor to Scram.Cause Attributed to Normal Degradation of Control Rod Drive Seals (← links)
- 05000259/LER-1991-007-02, :on 910531,EDG auto-started Due to Degraded Voltage Condition on 4 Kv Shutdown Board.Caused by Inadequate Procedure Control.Daily Electrical Log Revised (← links)
- 05000259/LER-1991-006-02, :on 910507,unplanned ESF Actuation Occurred When Control Room Emergency Ventilation Sys Initiated. Caused by Design Which Made It Difficult to Perform Work. Util Will Evaluate Need for Design Change (← links)
- 05000259/LER-1983-053-03, /03L-0:on 830314,control Room Emergency Ventilation Train a Flow Control Damper Found in Full Open Position.Caused by Loose Damper Arm.Damper Reset to Proper Position (← links)
- 05000259/LER-1983-040-03, /03L-0:on 830707,during Surveillance,Seismic Event Strong Motion Accelograph Channel 2 Failed to Record. Caused by Faulty Transverse Channel Output Amplifier. Amplifier Replaced (← links)
- 05000259/LER-1983-042-03, /03L-0:on 830629,reactor Bldg Elevation 621 Fire Protection Panel 1-25-303,Zone S,W & X Trouble Alarm Sounded.Caused by Spring Loaded 8A Fuse Holder Releasing. Fuse & Fuse Holder Repaired (← links)
- 05000259/LER-1983-038-03, /03L-0:on 830627,trouble Alarm Came in for Control Bay Elevation 593 Fire Protection Panel 1-25-325,Zone 14,due to Power Loss to Some Smoke Detectors.Power Loss Caused by Loose Wire Connected to Detector XS-39-104BE (← links)
- 05000259/LER-1983-031-03, /03L-0:on 830614,during Performance of Instrument Checks & Observations,Nitrogen Level Transmitter LI-84-2A Found Indicating 100%.Caused by Leak in Sensing Line of Transmitter,Resulting in False High Readings (← links)
- 05000259/LER-1983-034-03, /03L-0:on 830613,standby Gas Treatment Sys Train B Inoperable Due to Heaters Being Unavailable in Automatic. Caused by Incorrect Damper Adjustment.Damper Readjusted (← links)
- 05000259/LER-1983-032-03, /03L-0:on 830612,during Refueling Outage,Trouble Alarm Came in for Control Bay Elevation 593 Fire Protection Panel 1-25-325,zone 14.Caused by Power Loss to Some Smoke Detectors Due to Loose Wires (← links)
- 05000259/LER-1983-030-03, /03L-0:on 830612,during Refueling Outage,Stack Gas Sample Pump B Tripped Making Both Stack Monitoring Channels Inoperable.Caused by Overcurrent.Pump B Replaced.Failures Being Investigated (← links)
- 05000259/LER-1983-036-01, /01T-0:on 830630,during Cycle 5 Refueling Outage, Seven of 13 two-stage Relief Valves Tested for as-found Set Pressure Initially Failed to Lift within Allowable 1% Tolerance.Cause Being Evaluated (← links)
- 05000259/LER-1983-035-01, /01T-0:on 830614,standby Gas Treatment Train a & B Flows Adjusted W/Faulty Instrument Readings.Caused by Component Failure.Instrument Repaired & Calibr (← links)
- 05000259/LER-1983-048-03, /03L-0:on 830729,two Relays on 4 Kv Shutdown Board a & One Relay on Board C Operated Between 3,942-3,950 Volts.Caused by Relay Setpoint Drift Due to Increase in Ambient Temp (← links)
- 05000259/LER-1983-041-03, /03L-0:on 830720,control Room Emergency Ventilation Sys B Failed to Achieve Flowrate Required by Tech Spec.Caused by Partially Closed Manual Damper Due to Wing Nut Loosened by Vibration (← links)
- 05000259/LER-1983-021-01, /01T-0:on 830424,130 Fuel Bundles Unloaded from Core Into high-density Spent Fuel Storage Rack (Hdsfsr) Did Not Have Required post-installation Boron Test.Caused by Personnel Failure to Verify Hdsfsr Acceptability (← links)
- 05000259/LER-1982-030-03, During Normal Operation, GE Error Noted in Transient Analysis for Cycle 5.Caused by Procedural Error.Min Critical Power Ratio Increased by 0.02 (1.6%).Data Constants Will Be Changed (← links)
- 05000259/LER-1980-049-03, Increase in Pressure Detected on Shell Side of RHR 1-C Hx.Caused by Loose Locking & Full Nuts on Floating Head Due to Thermal Cycling & Vibration.Locking Tabs Installed on Nuts (← links)
- 05000259/LER-1994-003-03, :on 940713,defect Discovered in Pressure Rating for Air Conditioning Units (Acu) Supplied by Ellis & Watts. on 940823,determination Made That Event Reportable Per 10CFR21.All Acus Will Be Reworked (← links)
- 05000259/LER-1994-002-03, :on 940428,GE Akr Circuit Breakers Failed Trip Time Tests Due to Different Testing Equipment Used by TVA & GE for Breaker Testing.Akr Breakers Returned to GE for Addl Rework & Retest (← links)
- 05000259/LER-1983-015-03, /03L-0:on 830310,temp Switch TS-71-2L Operated at 2049F,exceeding Tech Spec Requirements.Caused by Temp Switch Calibr Drift.Switch Replaced,Functionally Tested & Returned to Svc (← links)
- 05000259/LER-1983-014-03, /03L-0:on 830310,while Performing Primary Containment Isolation Valve Operability Test,Drywell Equipment Drain Isolation Valve Closed in 45 S,Exceeding Limit.Caused by Oily,Gummy Film Covering Internals (← links)
- 05000259/LER-1980-011-01, Analysis Indicated Potential Loss of Primary Containment During Hot Standby. Caused by Not Considering Probability of LOCA in Initial Plant Design.Mods to Ductwork Completed (← links)
- 05000259/LER-1983-012-03, /03L-0:on 830301,during Normal Operation,Initiate Containment Spray Alarm XA-64-67 Annunciated.Caused by Defective IN3022 Zener Diode in Pressure Switch 1-PS-64-67. Alarm Unit Repaired,Recalibr & Returned to Svc (← links)
- 05000259/LER-1983-013-01, /01T-0:on 830307,standby Gas Treatment Train C Removed from Svc for Maint.Testing Revealed Train Failed to Meet Tech Spec Flowrate Requirements.Caused by Stuck Back Draft Damper.Damper Adjusted (← links)
- 05000259/LER-1983-010-03, /03L-0:on 830224,while Performing SI 4.7.B-3, Standby Gas Treatment Train B Declared Inoperable Due to Failure to Meet Flow Distribution Requirements.Caused by Debris in HEPA Filters.Filters Replaced (← links)
- 05000259/LER-1983-026-03, /03L-0:on 830525,containment Atmosphere Dilution Tank B Level Transmitter LT-84-13A Indicated Above Tech Spec Limit.Caused by Transmitter Zero Drift.Transmitter Recalibr (← links)
- 05000259/LER-1983-027-03, /03L-0:on 830526,discovered That Surveillance Instruction 4.8.3.4-3 for Reactor Bldg Vent Monitoring Sys Calibr Not Performed within Required Interval.Caused by Personnel Error.Calibr Performed (← links)
- 05000259/LER-1983-009-01, Design Review of Emergency Diesel Generator Engine Coolers Showed Coolers May Not Be Able to Maintain Cooling Water Below Hot Setpoint. Caused by Design Error.Setpoint Raised (← links)
- 05000259/LER-1983-011-03, /03L-0:on 830217,radiation Monitor RM-90-259A Setpoint Found Above Tech Spec Limit.Caused by Setpoint Drift.Monitor Calibr,Functionally Tested & Returned to Svc (← links)
- 05000259/LER-1983-022-03, /03L-0:on 830429,downstream HEPA Filters in Standby Gas Treatment Sys Trains a & B Exceeded Tech Spec 18-month Test Frequency.Caused by Personnel Error.Procedure SI 4.7.B-4 Review Rescheduled (← links)
- 05000259/LER-1982-020-03, Unidentified Drywell Leakage Increased in Excess of Tech Spec Limits.Caused by Vibration Induced Fatigue Crack in 3/4-inch Reactor Water Cleanup Sys Test Connection.Line Rerouted (← links)
- 05000259/LER-1981-089-03, While Performing SI 4.9.A-1.a,suppl A,Diesel Engine D Oversped & Tripped After Receipt of Fast Start Signal.Caused by Crack in Nipple from Booster Pumps to Governor,Resulting in Oil Leakage (← links)
- 05000259/LER-1981-069-03, During Performance of SI 4.8.B.4-4,gaseous Channel of Continuous Air Monitor O-RM-90-252 Read Downscale.Caused by Instrument Drift. Courting Ratemeter Calibr & Channel Returned to Svc (← links)
- 05000259/LER-1982-011-03, /03L-0:on 820124,continuous Air Monitor O-RM-90-252 Found Out of Calibr.Caused by Component Failure. NMC Count Rate Card Number CRA14-A & Triplett Number 420-G Iodine Meter on Continuous Air Monitor Replaced (← links)
- 05000259/LER-1983-008-03, /03L-0:on 830210,secondary Containment Breached When Turbine Bldg to Reactor Bldg Doors Opened Simultaneously.Caused by Failure of Interlock Sys.Reactor Bldg Doors Not Closed Far Enough to Engage Strike (← links)
- 05000259/LER-1983-007-03, /03L-0:on 830205,MSRV 1-1-22 Failed to Close & Drywell Unidentified Leakage Exceeded 5 Gpm.Caused by Damaged Vacuum Relief Valve Failing to Reseat.Valve Replaced.Mod Planned During Next Refueling Outage (← links)
- 05000259/LER-1983-004-03, /03L-0:on 830124,recirculation Pump 1A Increased Speed,Was Manually Tripped & Would Not Restart.Caused by Broken Heim Joint within Hydraulic Coupler Which Allowed Full Coupling of Motor & Generator.Joint Replaced (← links)
- 05000259/LER-1983-006-01, /01T-0:on 830205,following Reactor Scram,Main Steam Relief Valve 1-1-22 Manually Opened & Failed to Close. on 830208,valve Opened at 178 Psig.Caused by Excessive Pilot Valve Leakage & Broken Bracket for Pilot Inlet Tube (← links)
- 05000259/LER-1983-001-03, /03L-0:on 830110,pressure Switch 1-PS-75-7 Found to Have Setpoint of 174 Psi.Tech Specs Require Setpoint to Be 185 + 10 Psi.Caused by Setpoint Drift.Mercoid Switch Recalibr (← links)
- 05000259/LER-1991-003-02, :on 910301,gaseous & Liquid Effluent Samples Missed.Caused by Improper Work Practices.Security Data Obtained & Reviewed & Excessive Interviews Conducted to Properly Assess Extent of Problem (← links)
- 05000259/LER-1982-099-01, /01T-0:on 821208,during Periodic Leak Detection Program,Weeping Leak Found in Cracked 1/2-inch Core Spray Sys Sample Connection Pipe.Caused by Fatigue Failure Induced by Vibration.Repairs Made (← links)
- 05000259/LER-1991-002-01, :on 910201,discovered That Reactor/Turbine Bldg Ventilation Radiation Monitor 1-RM-90-250 Did Not Contain Particulate Filter & Charcoal Cartridge.Caused by Personnel Error.Filter Holder Assembly Replaced (← links)
- 05000259/LER-1982-092-03, /03L-0:on 821116,reactor Pressure Switches PS-68-93 & PS-68-64 Found Operating Below Tech Spec Requirements.Caused by Calibr Drift.Switches Recalibr & Returned to Svc (← links)
- 05000259/LER-1982-091-03, /03L-0:on 821109,during Diesel Generator Monthly Test,Control Room Operator Unable to Raise Speed of Diesel Generator D.Caused by Failed Woodward Governor Co Microswitch.Switch Replaced (← links)
- 05000259/LER-1982-090-03, /03L-0:on 821104,secondary Containment Breached When Turbine to Reactor Bldg Doors Opened Simultaneously During Door Interlock Maint.Caused by Insufficient Control While Interlocks Inoperable.Door Watch Instructions Written (← links)
- 05000259/LER-1982-089-03, /03L-0:on 821103,during Primary Containment Purge Sys Filter Pressure Drop Test,Primary Purge Sys Failed to Achieve Required Flow Rate.Caused by Clogged HEPA Filters. New Filters Installed & Satisfactorily Tested (← links)
- 05000259/LER-1982-093-01, /01T-0:on 821118,safety Injection Valves 4.2.B-31, 4.2.B-36 & 4.2.B-37 Left in Normally Open Position Contrary to Requirement That Valves Be Administratively Controlled W/ Power Lifted.Caused by Procedural Inadequacy (← links)
- 05000259/LER-1982-088-03, /03L-0:on 821028,discovered Momentary Breach of Secondary Containment Due to Personnel Access Airlock Doors Between Unit 2 Reactor & Turbine Bldgs Being Opened at Same Time.Caused by Misaligned Solenoid.Solenoid Realigned (← links)
- 05000259/LER-1983-017-03, /03L-0:on 830322,diesel Generator 1D Declared Inoperable When Lube Oil Circulating Pump Motor Tripped Off. Trip Caused by 480-volt Motor Leads Shorting Out,Due to Breakdown of Insulating Tape.Wiring Replaced (← links)
- 05000259/LER-1991-001-01, :on 901227 & 31,failure of Two Trains of Standby Power Sys to Load Sequence Occurred.Caused by Unexpected Failure Affecting Reliability of Equipment. Parallel Redundant Contacts Added (← links)
- 05000259/LER-1990-020, :on 901214,shutdown Board 1B Deenergized When Normal Feeder Breaker to Board Tripped During Time Delay Relay Test Resulting in ESF Actuation.Caused by Procedure Inadequacy.Maint Procedures Revised (← links)
- 05000259/LER-1982-087-03, /03L-0:on 821024,during Normal operation,480-volt Reactor MOV Board 1DA Motor Generator Set Voltage Swing Exceeded Tech Specs.Caused by Failure of Capacitor in Voltage Regulator.Regulator Replaced (← links)
- 05000259/LER-1990-021, :on 900927,hourly Fire Watch Could Not Enter a 4,160-volt Shutdown Board Room to Perform Visual Insp of Area in Violation of Tech Spec.Caused by Procedural Deficiency.Fire Protection Plan Revised (← links)
- 05000259/LER-1990-019, :on 901229,hourly Fire Watch Not Established When Instrument & Control Bus 1A Tripped Resulting in Loss of Power to Fire Detection Panels.Caused by Inadequate Procedure.Bus Returned to Svc (← links)
- 05000259/LER-1990-018-01, :on 901211,micro Access Computer Malfunctioned Causing Nine Firewatch Observations to Be Late.Caused by Personnel error.MAC-50 Computer Reprogrammed.Firewatches on Compressed Schedule (← links)
- 05000259/LER-1982-084-03, /03L-0:on 821018,reactor Water Level Switches 1 & 2 of LIS-3-203B as-found Calibr Violated Tech Specs. Caused by Instrument Drift.Switches Recalibr,Functionally Tested & Returned to Svc (← links)
- 05000259/LER-1990-021-01, :on 900927,proper Compensatory Actions Not Taken for Fire Protection Detection Sys Out of Svc When Hourly Fire Watch Could Not Enter 4,160-volt Shutdown Board Room A.Investigation Underway (← links)
- 05000259/LER-1990-020-01, :on 901214,480-volt Shutdown Board 1b de-energized When Normal Feeder Breaker Tripped. Investigation Underway.Operations Personnel Notified Immediately After Event (← links)
- 05000259/LER-1982-081-03, /03L-0:on 821008,during Normal Operation While Performing Routine Filter Changeout,Continuous Air Monitor CAM 1-90-251 Found Inoperable.Caused by Low Oil Level in Sample Pump.Pump Refilled W/Oil (← links)
- 05000259/LER-1982-085-03, /03L-0:on 821010,smoke Detector XS-39-27A Alarmed & Would Not Clear.Probably Caused by Increased Detector Sensitivity.Detector Replaced & Tested Satisfactorily. Firewatch Established (← links)
- 05000259/LER-1982-086-01, /01T-0:on 821025,while Performing Surveillance Test,Degraded Voltage Relay on Each of 4 Kv Shutdown Boards a & B Found to Operate at 3,885 & 3,897 Volts,Respectively. Caused by Setpoint Drift Due to Variations in Room Temp (← links)
- 05000259/LER-1990-019-02, :on 901212,hourly Fire Watch Not Established When Instrument & Control Bus 1A Tripped,Resulting in Loss of Power to Fire Detection Panels.Investigation Underway. Supplemental Rept Will Be Submitted by 910214 (← links)
- 05000259/LER-1990-018-02, :on 901211,Security Micro Access Computer MAC-540 Malfunctioned & Automatically Shut in Degraded Mode. Nine Firewatch Observations Performed Late Due to Locking Vital Area Doors.Caused by Personnel Error (← links)
- 05000259/LER-1982-056-01, During Shutdown for Secondary Testing & Maint,Crack Discovered in Elbow Weld in Defunct 1-inch Pressure Differential Switch Line on Jet Pump Riser.Caused by Vibration.Elbow Replaced (← links)
- 05000259/LER-1990-017-01, :on 901122,relay Line Breaker Began Cycling from Closed to Open Causing Voltage Disturbance.Caused by Procedural Deficiency.Operations Personnel Attempted to Stabilize Relay Line by Following Recommendations (← links)
- 05000259/LER-1982-077-03, /03L-0:on 820918,control Rod 38-39 Declared Inoperable Due to Fuse Failure Alarms & high-water Level Alarms Indicating.Caused by Control Rod Drive Hydraulic Control Unit Accumulator Level Switch Being Grounded (← links)
- 05000259/LER-1982-076-03, /03L-0:on 820925,turbine Bldg Roof Vent Monitor CAM 1-90-251 Became Inoperable.Caused by Failure of Pump Drive Motor,Model 6K562C Due to End of Natural Life.Drive Motor Replaced (← links)
- 05000259/LER-1982-073-03, /03L-0:on 820910,while Performing Maint on Diesel Generator A,Fuel Oil Flowed Out Discharge Filter Drain Valve When Transfer Pumps Supplied Oil to Day Tank.Caused by Personnel Error.Responsible Person Reinstructed (← links)
- 05000259/LER-1990-016, :on 901004,residual Heat Service Water Pump auto-start Failed to Respond as Expected During Performance of 3D Diesel Generator Run (← links)
- 05000259/LER-1982-065-03, /03L-0:on 820827,during Normal Operation While Performing Liquid Effluents Release Procedure,Discharge Isolation Setpoint Not Set as Required.Caused by Inadequate Instructions for Setpoint Verification (← links)
- 05000259/LER-1982-051-03, /03L-0:on 820802,SI 4.1.A-8 (RPS-High Water Level in Scram Discharge Tank-LS-85-45A-F) Not Performed within Required Interval.Caused by Scheduling Personnel Inadequately Communicating Change (← links)
- 05000259/LER-1980-076-03, /03L-0:on 801007,air Differential Temp Recorders TDR-90-103 & -104 on Channels a & B Failed.Caused by Component Failure in Model 3450 Digital Voltmeter.Voltmeter Repaired (← links)
- 05000259/LER-1980-072-03, /03L-0:on 800924,during Normal Operation,Rhr Torus Return Valve FCV-74-71 Was Found to Be Inoperable.Caused by Grounded Operator Motor Which Caused Breaker to Trip.Motor Replaced (← links)
- 05000259/LER-1980-056-03, Tech Spec Limit for Linear Heat Generation Rate Was Exceeded in One Node.Event Has Been re-evaluated as Nonreportable,Since Unit Was at Steady State (← links)
- 05000259/LER-1978-034-01, /01T-0 on 781205:during Refueling Outage 6 MSIVs Exceeded Leakage Limits.Caused by Degradation of Valve Seating Surfaces Thru Normal Oper (← links)
- 05000259/LER-1978-034, Forwards LER 78-034/01T-0 (← links)
- 05000259/LER-1982-097-03, /03L-0:on 821203,review Revealed Several Isolation Valves Tested Less Frequently than Required by Tech Spec.Caused by Misinterpretation of NRC Guidelines When Implementing Asme,Section Xi.Instructions Revised (← links)
- 05000259/LER-1978-032-03, /03L-0 on 781022:offgas Sampling Pump a Malfunctioned & Pump B Motor Would Not Start.Caused by Vanes Sticking on Pump A,Model MB21 Mfg by Metal Bellows Corp. Bearings & Centrifugal Switch Failed on Pump B Motor (← links)
- 05000259/LER-1978-032, Forwards LER 78-032/03L-0 (← links)
- 05000259/LER-1978-033-03, /03L-0 on 781025:radwater Airborne Effluent Monitor Recorder RM-90-252 Failed to Oper Resulting in Loss of Continuous Effluent Monitoring.Caused by Broken Input Signal Lead (← links)
- 05000259/LER-1978-033, Forwards LER 78-033/03L-0 (← links)
- 05000259/LER-1994-001-01, :on 940304,EECW Pump A3 Inadvertently Auto Started During Performance of SI O-SI-4.2.B.-67.Caused by Personnel Error.Electrical Maint Procedures Will Be Revised. Walkdown of 4 Kv Shutdown Will Be Performed (← links)
- 05000259/LER-1978-031-03, /03L-0 on 781016:two Zones of Fire Protec Fixed Spray Piping in Reactor Bldg Were Found Transposed Due to Misinterpretation of Drawings Causing Incorrect Installation of Piping.Piping Has Been Reconnected to Agree W/Drawings (← links)
- 05000259/LER-1978-031, Forwards LER 78-031/03L-0 (← links)
- 05000259/LER-1978-030-03, /03L-0:on 781013,four Heat Detectors Found to Be Connected to Incorrect Spray Zones.Elec Panel 1-25-281A Was Wired Incorrectly Causing Improper Sequencing.Detectors Were Rewired & Returned to Oper Per Tech Specs (← links)
- 05000259/LER-1978-030, Forwards LER 78-030/03L-0 (← links)
- 05000259/LER-1978-029-01, /03L-0:on 781012,cable Raceway Between Diesel Generator Bldg & Standby Gas Treatment Bldg Appeared to Have Settled 2 Inches at Diesel Generator Bldg & Expansion Joint. Cause Unknown.New Supports Will Be Installed on Raceways (← links)
- ML12100A148 (redirect page) (← links)
- 05000260/LER-2012-006, Regarding Unplanned Automatic Reactor Scram Due to Loss of Power to the Reactor Protection System (← links)
- 05000259/LER-2012-010, Re Browns Ferry, Unit 1 Primary Containment Isolation Valve Inoperable for Longer than Allowed by the Technical Specifications (← links)
- 05000259/LER-2012-001-01, Regarding Unanalyzed Conditions Discovered During NFPA 805 Transition Review (redirect page) (← links)
- ML13002A060 (redirect page) (← links)
- 05000259/LER-2012-001-01 (redirect page) (← links)
- 05000259/LER-2012-009, For Browns Ferry, Units 1, 2 and 3, Regarding 480 Volt Shutdown Board Breaker Actions in Safe Shutdown Instruction Procedures May Not Work as Written Due to Cable Fire Damage (← links)
- 05000260/LER-2012-005, Unanalyzed Conditions Discovered During National Fire Protection Association 805 Transition Affecting Division II of the Residual Heat Removal System (← links)
- 05000260/LER-2012-004, Regarding High Pressure Coolant Injection System Rendered Inoperable Due to an Inadvertent Actuation of Primary Containment Isolation System (← links)
- 05000259/LER-2012-008, For Browns Ferry Nuclear Plant, Unit 1, Regarding Standby Gas Treatment System Train C Inoperable Longer than Allowed by Technical Specifications (← links)
- 05000260/LER-2012-003, Regarding 480V Reactor Motor Operated Valve Board 2E Failed to Manually Transfer to Alternate Power (← links)
- 05000260/LER-2012-002, High Pressure Coolant Injection System Rendered Inoperable Due to an Inoperable Primary Containment Isolation Valve (← links)
- 05000259/LER-2012-007, Cable Routing Error Would Result in Failure of Direct Current Control Power to Credited 4kV Shutdown Board 3EA During an Appendix R Event (← links)
- 05000296/LER-2012-005, Regarding Automatic Reactor Scram Due to an Actuation of a Main Transformer Differential Relay (← links)
- 05000296/LER-2012-004, Regarding Manual Reactor Scram During Startup Due to Multiple Control Rod Insertion (← links)
- 05000296/LER-2012-006, Regarding Main Steam Relief Valves Lift Settings Outside Technical Specifications Required Setpoint (← links)
- 05000296/LER-2012-003, For Browns Ferry Nuclear Plant, Unit 3, Regarding Automatic Reactor Scram Due to De-Energization of Reactor Protection System from Actuation of 3A Unit Station Service Transformer Differential Relay (← links)
- 05000259/LER-2012-006, For Browns Ferry Nuclear Plan, Unit 1, Regarding High Pressure Coolant Injection System Turbine Failed to Trip Using the Manual Trip Pushbutton (← links)
- 05000260/LER-2012-001, Regarding Browns Ferry Nuclear Plant, Units 2 and 3, Inappropriate LOCA Modeling of Core Spray for Limiting LOCA Event with Manual Actuation of Automatic Depressurization System (← links)
- 05000296/LER-2012-002, Regarding Main Steam Isolation Valve Leakage in Excess of Technical Specification Requirements (← links)
- 05000259/LER-2012-005, Regarding Combustible Materials Not in Compliance with the 20-Foot Exclusion Zone Requirements (← links)
- 05000259/LER-2012-004, Brown Ferry Nuclear Plant Regarding Fire Damage to Cables in Fire Areas Could Cause a Residual Heat Removal Service Water Pump to Spuriously Start (← links)
- 05000259/LER-2012-003, Regarding Reactor Protection System Circuit Could Potentially Remain Energized During an Appendix R Fire (← links)
- 05000259/LER-2012-002, Regarding Fault Propagation During a Postulated Appendix R Event Could Result in an Inability to Close Motor Operated Valves (← links)
- 05000296/LER-2012-001, Regarding Annunciator Panel Power Supply Fire in Unit 3 Control Room (← links)