Pages that link to "05000293/LER-2007-001, Regarding Primary Containment Isolations Following a Manual Reactor Scram"
Jump to navigation
Jump to search
The following pages link to 05000293/LER-2007-001, Regarding Primary Containment Isolations Following a Manual Reactor Scram:
Displayed 8 items.
- 05000293/LER-2007-001 (redirect page) (← links)
- 05000529/LER-2007-004 (← links)
- 05000315/LER-2007-002 (← links)
- 05000413/LER-2007-004 (← links)
- 05000346/LER-2007-001 (← links)
- 05000335/LER-2007-003 (← links)
- 05000309/LER-2007-001 (← links)
- 05000293/LER-2001-006 (← links)
- 05000293/LER-2001-005 (← links)
- 05000293/LER-2001-004 (← links)
- 05000293/LER-2001-003 (← links)
- 05000293/LER-2001-001 (← links)
- 05000266/LER-2007-002 (← links)
- 05000293/LER-1982-018, Forwards LER 82-018/03L-0 (← links)
- 05000293/LER-1982-019, Forwards LER 82-019/03L-0 (← links)
- 05000293/LER-1982-017, Forwards LER 82-017/03L-0 (← links)
- 05000293/LER-1982-016, Forwards LER 82-016/03L-0 (← links)
- 05000293/LER-1982-015, Forwards LER 82-015/03L-0 (← links)
- 05000293/LER-1982-009, Forwards LER 82-009/03L-0 (← links)
- 05000293/LER-1982-007, Forwards LER 82-007/01T-0 (← links)
- 05000293/LER-1982-037, Forwards LER 82-037/03L-0 (← links)
- 05000293/LER-1983-004, Forwards LER 83-004/03L-0 (← links)
- 05000293/LER-1983-003, Forwards LER 83-003/03L-0 (← links)
- 05000293/LER-1982-029, Forwards LER 82-029/03L-0 (← links)
- 05000293/LER-1982-022, Forwards LER 82-022/03L-0 (← links)
- 05000293/LER-1982-028, Forwards LER 82-028/03L-0 (← links)
- 05000293/LER-1982-030, Forwards LER 82-030/03L-0 (← links)
- 05000293/LER-1982-026, Forwards LER 82-026/01T-0 (← links)
- 05000293/LER-1982-024, Forwards LER 82-024/01T-0 (← links)
- 05000293/LER-1982-025, Forwards LER 82-025/01T-0 (← links)
- 05000293/LER-1982-023, Forwards LER 82-023/01T-0 (← links)
- 05000293/LER-1982-056, Forwards LER 82-056/01T-0 (← links)
- 05000293/LER-1982-035, Forwards LER 82-035/03L-0 (← links)
- 05000293/LER-1982-036, Forwards LER 82-036/03L-0 (← links)
- 05000293/LER-1982-027, Forwards LER 82-027/03L-0 (← links)
- 05000293/LER-1982-021, Forwards LER 82-021/03L-0 (← links)
- 05000293/LER-1983-001, Forwards LER 83-001/03L-0 (← links)
- 05000293/LER-1982-057, Forwards LER 82-057/03L-0 (← links)
- 05000293/LER-1982-054, Forwards LER 82-054/03L-0 (← links)
- 05000293/LER-1982-053, Forwards LER 82-053/03L-0 (← links)
- 05000293/LER-1982-048, Forwards LER 82-048/03L-0 (← links)
- 05000293/LER-1983-007, Forwards LER 83-007/03L-0 (← links)
- 05000293/LER-1983-008, Forwards LER 83-008/03L-0 (← links)
- 05000293/LER-1983-009, Forwards LER 83-009/03L-0 (← links)
- 05000293/LER-1982-038, Forwards LER 82-038/03L-0 (← links)
- 05000293/LER-1982-032, Forwards LER 82-032/03L-0 (← links)
- 05000293/LER-1982-031, Forwards LER 82-031/03L-0 (← links)
- 05000293/LER-1982-033, Forwards LER 82-033/03L-0 (← links)
- 05000293/LER-1983-006, Forwards LER 83-006/03L-0 (← links)
- 05000293/LER-1982-055, Forwards LER 82-055/03L-0 (← links)
- 05000293/LER-1982-052, Forwards LER 82-052/03L-0 (← links)
- 05000293/LER-1982-050, Forwards LER 82-050/03L-0 (← links)
- 05000293/LER-1982-049, Telecopy LER 82-049/01X-0:on 821102,safety Valve a Found Set W/Nitrogen at Steam Relief Setting.Caused by Personnel Error.Properly Tested Spare Valve Installed.Personnel Admonished to Read & Follow Procedures Exactly (← links)
- 05000293/LER-1982-051, Forwards LER 82-051/03L-0 (← links)
- 05000293/LER-1982-045, Forwards LER 82-045/03L-0 (← links)
- 05000293/LER-1982-047, Forwards LER 82-047/03L-0 (← links)
- 05000293/LER-1982-041, Forwards LER 82-041/03L-0 (← links)
- 05000293/LER-1982-044, Forwards LER 82-044/03L-0 (← links)
- 05000293/LER-1982-042, Forwards LER 82-042/03L-0 (← links)
- 05000293/LER-1982-043, Forwards LER 82-043/03L-0 (← links)
- 05000293/LER-1983-047, Telecopy LER 83-047/01X-0:on 830913,recirculation Pump low-low Water Trip Relay (16AK8A) Found Smoking.Power Deenergized.Failure of Relay Contacts Due to Coating of Smoke & Varnish.Relay Replaced (← links)
- 05000293/LER-1983-017, Forwards LER 83-017/03L-0 (← links)
- 05000293/LER-1983-014, Forwards LER 83-014/03L-0 (← links)
- 05000293/LER-1983-015, Forwards LER 83-015/03L-0 (← links)
- 05000293/LER-1982-012, Forwards LER 82-012/03L-0 (← links)
- 05000293/LER-1980-034, Updated LER 80-034/03X-1:on 800701 & 16,HPCI Turbine Discharge Line Snubber Found Severed & HPCI Declared Inoperable.Caused by Transient Hydrodynamic Shock During Startup & Shutdown of HPCI Turbine (← links)
- 05000293/LER-1983-018, Forwards LER 83-018/03L-0 (← links)
- 05000293/LER-1983-016, Forwards LER 83-016/03L-0 (← links)
- 05000293/LER-1983-020, Telecopy LER 83-020/01X-0:on 830502,daily Surveillance Testing Per Tech Spec Section 4.11.D Not Performed.Caused by Failure to Revise Procedures & Inadvertent Removal of Sections from Tech Specs.Procedures Revised (← links)
- 05000293/LER-1983-013, Forwards LER 83-013/01T-0.Detailed Event Analysis Encl (← links)
- 05000293/LER-1983-010, Forwards LER 83-010/03L-0 (← links)
- 05000293/LER-1983-011, Forwards LER 83-011/03L-0 (← links)
- 05000293/LER-1982-008, Forwards LER 82-008/01T-0 (← links)
- 05000293/LER-1982-004, Telecopy Message of LER 82-004/01X-0:on 820222,primary Containment Isolation Valve Flanges Discovered W/Provision for Type B Llr Testing.Flanges Previously Type a Tested. Flanges Added to Llr Test Program (← links)
- 05000293/LER-1983-005, Forwards LER 83-005/01T-0 (← links)
- 05000293/LER-1977-049, Forwards LER 77-049/13C-0 (← links)
- 05000293/LER-1987-017, Forwards Revs to Plant Security Plan,Per 10CFR50.54(p),to Correct Areas Discussed in LER 87-017-00 Re Classification of Standby Gas Treatment Area as Vital.Encls Withheld (Ref 10CFR73.21) (← links)
- 05000293/LER-1978-045, Forwards LER 78-045/03L-0 (← links)
- 05000293/LER-1997-013, Discusses Commitment Made in LER 97-013-00.Deferral of Target Completion Date to 980430 Made.Mod Will Not Be Completed Until Spring 1999 Refueling Outage 12 (← links)
- 05000293/LER-1982-003, Forwards Updated LER 82-003/99X-2 (← links)
- 05000293/LER-1982-013, Forwards Updated LER 82-013/03X-1 (← links)
- 05000293/LER-1978-019, Forwards Updated LER 78-019/03X-1 (← links)
- 05000293/LER-1982-020, Forwards LER 82-020/03L-0 (← links)
- 05000293/LER-1997-016, :on 971105,recirculation Sys Loop B Pump Trip Was Noted.Caused by Sp Inadequacy.Revised Procedure (← links)
- 05000293/LER-1998-012, :on 980521,discovered Incomplete Installation of Fire Barrier in Cable Spreading Room.Caused by Inadequate Implementation of Original Design.Problem Rept 98.9256 Was Written to Document Condition Discovered (← links)
- 05000293/LER-1998-010, :on 980514,inadequate Surveillance Was Performed for Containment Cooling Flow Rate.Caused by Failure to Consider All safety-related Modes of Operation for Pump Sys.Problem Rept Was Written (← links)
- 05000293/LER-1992-001, :on 921219,Class I Piping Seismic Damping Ratios Found Were Not Approved by NRC for Use.Caused by Personnel Error.Class I Piping Evaluated Using Higher Damping Ratios & Declared Operable (← links)
- 05000293/LER-1997-015, :on 971104,SSW Pump Overload Setting Was Too Low for Single SSW Pump Operation W/Degraded Voltage.Caused by Variation in SSW Pump BHP Characteristics.Removed SSW Pumps from Service & Reset OL Relay for Each SSW Pump (← links)
- 05000293/LER-1997-015-01, Forwards LER 97-015-01,re SSW Pumps Overload Settings to Low for Single SSW Pump Operation W/Degraded Voltage.Commitments Made within Ltr,Listed (← links)
- 05000293/LER-1998-009, :on 980430,incorrect Specification of Seismic Requirements for Safety SRV Line Vacuum Breakers,Were Discovered.Caused by Incorrect Use of Seismic Input Criteria.Problem Rept & Engineering Evaluation Written (← links)
- 05000293/LER-1989-027, :on 890905,unplanned Actuation of Portion of RHR Sys/Lpci Loop Circuitry Resulted in Automatic Start of Diesel Generator a & Closed Pump Discharge Valve.Caused by Technician Error.Procedure Re Jumpers Revised (← links)
- 05000293/LER-1989-026, :on 890830,automatic Scram Signal & Reactor Scram Resulted in turbine-generator Trip & Opening of 345 Kv Switchyard Air Circuit Breakers.Caused by Automatic Turbine Runback.Wiring to Relays Reversed (← links)
- 05000293/LER-1986-017, :on 860701,as-found Test Results for 18-inch Anchor Darling Feedwater Check Valves Showed Leakage in Excess of Tech Specs.Caused by Thermal Aging & Erosion of Soft Seat Matl.Hinge Pins Replaced (← links)
- 05000293/LER-1989-014, :on 890412,inadvertent Overpressurization of RCIC Suction Piping Occurred During Surveillance Testing. Caused by Personnel Error.Personnel Trained Re Procedural Changes (← links)
- 05000293/LER-1997-010, :on 970420,postulated Pipe Break Pressure Relieving Pathway Boundary Door Was Found Open During Power Operation.Caused by Personnel Error.Closed & Latched Hasp of Door 9.Lock Obtained & Door Was Locked Closed (← links)
- 05000293/LER-1997-010-01, Forwards LER 97-010-01, Postulated Pipe Break Pressure Relieving Pathway Boundary Door Found Open During Power Operations. Ltr Contains Listed Commitments (← links)
- 05000293/LER-1997-023, :on 971031,both Radwaste Bldg Trucklock Doors Closed Resulting in Configuration Inconsistent W/Tornado Depressurization Analysis Assumptions.Caused by Inadequate Control of Subcompartment Barriers.Opened & Tagged One Door (← links)
- 05000293/LER-1997-023-01, Forwards LER 97-023-01 Re Both Radwaste Bldg Trucklock Doors Closed Resulting in Configuration Inconsistent W/Tornado Depressurization Analysis Assumptions (← links)
- 05000293/LER-1986-010, :on 860415,unplanned Isolation of Primary Containment Isolation Sys Occurred Resulting in Closure of Eight MSIVs & Main Steam Outboard Drain Drive.Root Cause Undetermined.Loose Connections Reworked (← links)
- 05000293/LER-1998-008, :on 980427,discovered Section of CR High Efficiency Air Filtration Sys Seismic Class I Ductwork Being Supported by Class II Ductwork.Caused by Lack of Consistent Application of Seismic Criteria.Will Implement Mods (← links)
- 05000293/LER-1984-010, :on 840822,determined That CRD Collet Retainer Tube Had Longitudinal through-wall Crack.Caused by IGSCC in Cold Worked & Weld Sensitized Stainless Steel.Matl Replaced & Metallurgically Examined (← links)
- 05000293/LER-1985-008, :on 850331,while Performing Routine HPCI Operability Flow Test,Hpci Turbine Tripped on Overspeed. Caused by Faulty Connector in Turbine Control Sys.Connector & Rupture Disc Replaced (← links)
- 05000293/LER-1982-056-01, /01x-1:on 821213,determined That Pressure Relieving Partition on South Wall of Steam Tunnel Had 2 H Fire Resistive Rating.Caused by Design Deficiency.Continuous Fire Patrol for Steam Tunnel Established (← links)
- 05000293/LER-1983-061-03, /03X-1:on 831203,position Indication on Panel C-7 Failed to Annuciate for Vacuum Breaker 5045H.Caused by Out of Adjustment Limit Switch.Limit Switches on All Torus Vacuum Breakers Adjusted & Tested (← links)
- 05000293/LER-1997-012, :on 970729,failure of Relay to Energize During Surveillance Test Was Noted.Caused by Incorrect Setting of Contacts.Replaced & Retested Relay on 970730 (← links)
- 05000293/LER-1997-012-01, Forwards LER 97-012-01,re Failure of Relay to Energize During Surveillance Test.Commitment Made within Ltr,Listed (← links)
- 05000293/LER-1989-021, :on 890615,automatic Actuation of Inboard & Outboard RWCU Sys Portion of Primary Containment Isolation Sys Occurred.Caused by Air in Sensing Lines of RWCU Sys Flow Sensors.Lines Bled to Eliminate Air (← links)
- 05000293/LER-1989-011, :on 890304,automatic Actuation of Portion of Primary Containment Isolation Control & Reactor Protection Sys Occurred During turbine-generator Coastdown.Caused by Turbine Bypass Valve Low Vacuum Trip (← links)
- 05000293/LER-1988-006, :on 880203,trip Signal Generated Unexpectedly from ATWS Div 2 Circuitry Resulting in Automatic Trip of Recirculation Sys Pumps & Subsequent Reactor Protection Sys Scram Signal.Cause Not Conclusively Determined (← links)
- 05000293/LER-1989-009, :on 890216,automatic Closing of Outboard RWCU Primary Containment Isolation Sys Occurred.Caused by RWCU Sys Flow Fluctuation.Inboard & Outboard RWCU Sys to Be Modified to Preclude Recurrence (← links)
- 05000293/LER-1982-006-03, /03X-1:on 820309,three of Four Cap Screws That Attach Main Disk Flange to Main Disk Found Broken.Caused by Overload Conditions Resulting from Erratic Valve Operation. Procedure Developed to Adjust Turbine Valve (← links)
- 05000293/LER-1989-025, :on 890805,HPCI Sys Declared Inoperable & 7-day Tech Spec Limiting Condition for Operation Entered.Caused by Failure of Gland Seal Condenser Blower Motor to Start.Blower Motor Brushes Replaced & Blower Tested (← links)
- 05000293/LER-1989-008, :on 890216,primary Containment Inadvertently Breached W/Opening of Inner & Outer Doors of Personnel Airlock for 5 S.Caused by Slack in Tie Rod Roller Chain Assembly.Security Post Order Issued (← links)
- 05000293/LER-1989-010, :on 890221,loss of Preferred Offsite Power Occurred That Resulted in Automatic Start of Emergency Diesel Generators.Caused by Actuation of Startup Transformer Differential Ground Relay.Cable Replaced (← links)
- 05000293/LER-1998-005, :on 980331,supports for RHR Quadrant Coolers Were Found Not to Be Seismically Qualified.Caused by Lack of Comprehensive Original Design of Seismic Stability.Approved Temporary Mod 98-06 Was Approved at Orc (← links)
- 05000293/LER-1998-006, :on 980331,failure to Comply W/Ts Limits on CR Worth Was Noted.Caused by Inadequate Verification & Control of Core Design Info.Ge Was Contacted to Perform Plant Specific Analysis for Current Cycle of Operation (← links)
- 05000293/LER-1989-020, :on 890614,unplanned Reactor Protection Sys Scram Signal Occurred During Shutdown.Caused by Operator Error.Responsible Operator Verbally Reprimanded for Failing to Follow Approved Procedure (← links)
- 05000293/LER-1989-019, :on 890609,RCIC Sys Made Inoperable Per Tech Specs Due to Inoperable Area Temp Switch.Caused by 890514 Surveillance Procedure Signed as Completed W/Unsatisfactory Results.Terminal Block Replaced (← links)
- 05000293/LER-1986-026, :on 861029,QA Audit Identified That Surveillances Required by Tech Spec Tables 4.2.D,Note 6 & 4.8-2 Not Procedurally Addressed.Caused by Lack of Verifications in Administrative Controls (← links)
- 05000293/LER-1988-017, :on 880608,crack Discovered in Yoke Portion of RHR Sys Loop B Valve.Caused by High Stress Levels Due to Yoke Design,Fabrication Defects & Excessive Application of Motor Operator Thrust.Valve Yoke Repaired (← links)
- 05000293/LER-1989-024, :on 890726,automatic Actuation of Outboard RWCU Sys Portion of Primary Containment Isolation Control Sys Occurred.Caused by Trip Signal from Outboard RWCU Sys Flow Sensor.Testing Planned for Addl Data (← links)
- 05000293/LER-1981-036-03, /03X-01:on 810709,trip Points for Pressure Switche Higher than Tech Specs Limit Found During Surveillance Test. Caused by Drifting of Trip Point of Switches.Switches Replaced W/Rosemount Transmitters (← links)
- 05000293/LER-1980-049-03, /03X-01:on 800810 & 11,thermal Overload Relay Associated W/Breaker Tripped Resulting in Loss of Salt Svc Water Pump.Caused by Actuation of Thermal Overload Devices. Biofouling Control Improved (← links)
- 05000293/LER-1989-013, :on 890324,HPCI Sys Became Inoperable During Operability Surveillance Test.Caused by Turbine Steam Supply motor-operated Valve Not Opening Due to Two Loose Screws Causing Damage to Valve Operator Internals (← links)
- 05000293/LER-1989-023, :on 890718,manually Initiated Reactor Protection Sys Scram Signal & Reactor Scram Occurred, Resulting in turbine-generator Trip & Transfer of Electrical Loads.Procedure Re Air Ejector Revised (← links)
- 05000293/LER-1989-017, :on 890520 & 21,unplanned Actuations of Same Portion of RHR Sys/Lpci Loop Selection Logic Circuitry Occurred While Shutdown.Caused by Engineer Error.Testing Suspended & Affected Components Restored (← links)
- 05000293/LER-1989-018, :on 890525,automatic Actuation of Outboard RWCU Sys Portion of Primary Containment Isolation Control Sys Occurred.Caused by Air in Instrumentation Sensing Line of RWCU Sys Flow Sensor.Procedures Revised (← links)
- 05000293/LER-1989-022, :on 890711,automatic Actuation of Inboard RWCU Sys Portion of Primary Containment Isolation Sys Occurred.Caused by Personnel Error.Maint Work Planning Procedure Revised (← links)
- 05000293/LER-1986-005, :on 860307,operator Discovered Water on Floor in Torus Room.Caused by Leak Resulting from Entrapped Air in RHR Sys.Head Spray Piping Cut & Capped.Procedures Revised to Provide Filling & Venting Instructions (← links)
- 05000293/LER-1986-009, :on 860411,leakage Indicated Through 1001-68B Check Valve & in-series Containment Isolation Valves MO-1001-28B & MO-1001-29B.Caused by Degradation of One Containment Isolation Valve & RHR Seating (← links)
- 05000293/LER-1989-016, :on 890518,unplanned Reactor Protection Sys Scram Signal Occurred While Shutdown.Caused by Personnel Error.Reactor Mode Selector Switch Moved to Refuel Position & Reactor Protection Sys Reset (← links)
- 05000293/LER-1986-007, :on 860322,unplanned Isolation of Primary Containment Isolation Sys Occurred Resulting in Closure of Eight MSIVs & Main Steam Inboard Drain Valve.Caused by Loose Electrical Neutral Connections on Logic Relays (← links)
- 05000293/LER-1989-012, :on 890309,unplanned Actuation of Portion of Rhr/Lpci Loop Selection Logic Circuitry Occurred During Logic Relay Testing,Resulting in Close Signals to Loop a Valves.Caused by Technician Error (← links)
- 05000293/LER-1989-015, :on 890503,high Reactor Vessel Water Level Occurred That Resulted in Automatic Turbine Trip,Generator Trip & Reactor Scram.Caused by Inadequate Troubleshooting Procedure.Feedwater Sys Components Recalibr (← links)
- 05000293/LER-1998-020, :on 980730,operating W/Less than Min Operating Shift Crew Composition Was Noted.Caused by off-going SCRE Not Ensuring Proper Relief of SCRE Function.Individual Was Appropriately Counseled (← links)
- 05000293/LER-1998-019, :on 980727,declared Standby Liquid Control Subsystem B Inoperable.Caused by Leakage Through Pipe Fitting on Pressure Gauge PI-1160B.Removed Subject Gauge, Cleaned Pipe Threads & Reinstalled Gauge (← links)
- 05000293/LER-1987-016, :on 871124,primary & Secondary Containment Sys Actuated Due to Coil Replacement in Primary Containment Isolation Control Sys Logic Relay.Caused by Inadequate Controls.Addl Reviews & Controls Established (← links)
- 05000293/LER-1987-014, :on 871112,loss of Preferred Offsite Power Occurred.Caused by Series of storm-related Faults in Power Transmission Sys Remote to Station.Plant Mod in Progress to Install Blackout Diesel Generator (← links)
- 05000293/LER-1998-018, :on 980722,noted That EDGs Were Inoperable Due to Ambient Air Temp Exceeding 88 F.Caused by Inadequate EDG Cooling & Bldg Ventilation Design.Will Develop EDG Cooling & Bldg Ventilation Mods W/Regard to Exceedance of Site Temp (← links)
- 05000293/LER-1997-025, :on 971123,completion of Required Shutdown Was Noted Due to Two Inoperable Msivs.Cause of Failure of Vessel Flange Thermocouples Could Not Be Conclusively Determined. Rv Flange Thermocouples Will Be Restored (← links)
- 05000293/LER-1997-025-01, Forwards LER 97-025-01 Re Completion of Required Shutdown Due to Two Inoperable Msivs.Ltr Revises Related Commitment for Corrective Action Previously Reported in Beco Ltr 2.98.026,dtd 980309.Revised Corrective Action,Listed (← links)
- 05000293/LER-1998-016, :on 980714,CR Ventilation Exhaust Damper & Ductwork Was Not Seismically Qualified.Caused by Lack of Consistent Application of Seismic Criteria for Design & Installation.Problem Rept Pr 98.9377 Has Been Written (← links)
- 05000293/LER-1998-017, :on 980713,incomplete Surveillance Was Performed for Reactor Water Level Instrument Channels.Caused by Deficient Surveillance Procedure.Surveillance Procedure 8.M.2-6.3, Reactor Level Readout, Will Be Revised (← links)
- 05000293/LER-1987-012, :on 870928,three Full Scram Trip Signals Occurred Due to Spiking of Intermediate Range Monitors. Caused by High Frequency Welding in Drywell.Welding Activities Suspended (← links)
- 05000293/LER-1998-014, :on 980622,identified Potential Degraded Grid Voltage Condition.Caused by Misunderstanding of Regulatory Guidelines.Engineering Evaluation Ee 98-0055 Prepared to Address Discrepancy in Timing of Restoring Emergency Power (← links)
- 05000293/LER-1998-015, :on 980622,identified Potential Low Voltage Condition,Coincident w/loss-of-coolant Accident.Caused by Deficiency in Original Design of Degraded Voltage Protection Sys.Design Basis Reviewed (← links)
- 05000293/LER-1987-011, :on 870707,automatic Actuation of Reactor Protection Sys Occurred When Electrical Protection Assemblies (EPA) 1 & 2 Tripped.Caused by Failed Logic Card in Control Circuitry of EPA 1 (← links)
- 05000293/LER-1987-010, :on 870702,automatic Actuation of Reactor Protection Sys (RPS) Occurred Due to Erratic Operation & Spurious Trip of Aprm.Possibly Caused by Disturbance of APRM Cabling & Connectors.Rps Scram Signal Reset (← links)
- 05000293/LER-1987-009, :on 871023,Failure & Malfunction Rept 87-600 Written to Document Original Design/Const Deficiency Identified During Review of Conduit Layout Drawing E-343. Caused by Deficiency in Original Plant Design (← links)
- 05000293/LER-1987-007, :on 871018,automatic Actuation of Reactor Protection Sys Occurred.Caused by Technician Error.Mode Switches for Both APRMs Immediately Returned to Operate Position & Further APRM Test Suspended (← links)
- 05000293/LER-1998-011, :on 961126,operator Discovered Two Shield Plugs Removed from Floor Directly Over Torus Compartment.Caused by Lack of Formal Program to Control sub-compartment Barriers. Developed Formal Program to Control Compartment Barriers (← links)
- 05000293/LER-1989-007, :on 890211,unexpected Group 1 Isolation Signal Due to High Reactor Vessel Water Level During MSIV Testing. Caused by Inadequacy in Development & Review of Test Procedure.Procedure Being Revised (← links)
- 05000293/LER-1989-006, :on 890210,automatic Actuation of Inboard RWCU Sys Portion of Primary Containment Isolation Control Sys Occurred.Caused by Air in Instrumentation Sensing Line of Rwcu.Air Vented from Inboard & Outboard RWCU (← links)
- 05000293/LER-1986-020, :on 860820,identified That South Wall of Switchgear Room Not Listed in Procedure 8.B.16.13.Caused by Failure to Identify Barrier Required to Meet 10CFR50,App R, in Site Surveillance Procedures.Actions Taken (← links)
- 05000293/LER-1989-005, :on 890203,locked High Radiation Area Access Door to Radwaste Truck Lock Found Unsecured During Routine 8 H Audit.Caused by Malfunction of Locking Mechanism.Door Secured & Addl Lock (Padlock) Attached (← links)
- 05000293/LER-1989-004, :on 890127,discovered Two Primary Containment Air Operated Valves Inoperable Resulting in Unit Shutdown. Caused by Pressure Drop Rate of Stored Air Supply for Valves.New Tubing Installed (← links)
- 05000293/LER-1987-015, :on 871207 & 08,isolation Signals Terminated RHR Shutdown Cooling Subsystem.Caused by Inadequacy of Procedure 2.1.8.1, Class 1 Sys Hydrostatic Test. Subsys Restored & Procedure 2.1.8.1 Revised (← links)
- 05000293/LER-1999-010-02, :on 990918,reactor Startup Was in Progress. Caused by Communications Breakdown That Resulted in Operations Personnel Failing to Complete Actions in IAW Procedures.Power Ascension Was Secured.With (← links)
- 05000293/LER-1998-003, :on 980220,discovered That RBCCW & Tbccw Heat Exchanger Supports Outside Design Basis Seismic Requirements.Caused by Calculation Error.Reviewed Similar Calculations & Counseled Individuals Associated W/Errors (← links)
- 05000293/LER-1999-009-02, :on 990913,manual Scram at 27 Percent Power, Occurred.Caused by Degrading Main Condenser Vacuum. Inspection of Instrument Sensing Lines to E-306B Level Transmitters Was Performed.With (← links)
- 05000293/LER-1999-002, :on 990504,HPCI & RCIC Sys Surveillance Testing Outside Design Bases,Was Identified.Caused by Incorrect Ts. Proposed License Amend to Change TS Surveillance Testing Requirements,Submitted on 990511.With (← links)
- 05000293/LER-1997-004-01, Forwards LER 97-004-01, Loss of Preferred Off-Site Power & Oil Spill Due to Main Transformer Fault While Shut Down. Commitment Made by Util,Listed (← links)
- 05000293/LER-1998-002, :on 980205,EDG Room Air Temperature Went Below Design Basis.Caused by Unawareness of Significant Effect Wind Direction Has on EDG Room Temp.Engineering Evaluation (Ee 97-066 R-1) Was Completed & Approved (← links)
- 05000293/LER-1987-005, :on 870331,loss of Preferred Offsite Power Occurred During Storm.Caused by Loss of Transmission Line 342 & Alternate Transmission Line 355 Becoming Isolated from Startup Transformer.Offsite Power Restored (← links)
- 05000293/LER-1986-023, :on 860912,mgt Review of Posted Fire Watches Identified Continuous Fire Watch Not Posted as Ordered on 860905.On 861001,17 Discrepancies Identified Where Hourly Patrols Not Documented (← links)
- 05000293/LER-1986-027, :on 861119,plant Experienced Loss of Offsite Power During Severe Winter Storm.Caused by Arcing of High Voltage Lines Due to Heavy Ice & Snow.All Safety Sys Performed as Expected (← links)
- 05000293/LER-1987-006, :on 870506,structural Analysis of 870313 Insp of Hydraulic Control Unit Frames Concluded That Design Basis Operability of Units Could Not Be Established for Loading Conditions.Cause Undetermined.Frames Restored (← links)
- 05000293/LER-1986-025, :on 861111,fire Water Suppression Sys Found to Be Inoperable.Caused by Misalignment of Fire Pump Suction Valves Due to Diagram,Procedure & Labeling Errors.Fire Pump Restored.Procedures & Diagrams Corrected (← links)
- 05000293/LER-1986-018, :on 860629,GE Akf Model 25 Field Breaker Failed to Trip Automatically.Similar Events Occurred on 830213, 850209 & 0315.Util Investigating for Cause.Corrective Actions Will Be Completed Prior to Startup (← links)
- 05000293/LER-1986-024, :on 861007,nonfire Resistant Coated Structural Steel Observed Embedded in Concrete Wall on North Side of Cable Spreading Room.Fire Watch Established.Options for 3-h Fire Rating Being Evaluated (← links)
- 05000293/LER-1999-008-02, :on 990805,automatic Scram Occurred While at 100% Power Due to Automatic Turbine Trip.Caused by Malfunction of Moisture Separator Drain Tank a Drain Valve Controller.Level Controllers Replaced.With (← links)
- 05000293/LER-1997-011-01, Forwards LER 97-011-01 Re Svc Water Sys Single Failure Vulnerability.Ltr Contains Listed Commitments (← links)
- 05000293/LER-1987-001, :on 870112,seven Relays in safety-related Sys Determined Not Seismically Qualified for Application.Cause Not Stated.Affected Circuits Will Be Modified & Relays Replaced W/Qualified Type (← links)
- 05000293/LER-1999-007-02, :on 990716,discovered That Bus B6 Voltage Restoration Was Not Consistent with Safety Analysis Assumptions.Caused by Personnel Error During Development of Design Change.Will Evaluate Need for Mod.With (← links)
- 05000293/LER-1986-022, :on 860829,failure to Leak Check Radioactive Source at Required Interval Discovered.Caused by Failure to Modify Master Surveillance Tracking Program (Mstp) to Note Proper Check Responsibility.Mstp Revised (← links)
- 05000293/LER-1999-006-02, :on 990705,both EDGs Were Inoperable.Caused by Ambient Air Temp Exceeding 88 Degrees Fahrenheit.Temporary Mods Tm 99-41 & Tm 99-42,implemented for EDG a Were Completed on 990706.With (← links)
- 05000293/LER-1986-004, :on 860220,standby Liquid Control Sys Declared Potentially Inoperable.Caused by Personnel Error When Surveillance Procedure Not Followed.Personnel Counseled (← links)
- 05000293/LER-1999-005, :on 990608,partial Actuation of Rhr/Lpci Circuitry During Surveillance Test Was Noted.Caused by Personnel Error.Revised Procedure.With (← links)
- 05000293/LER-1999-004, :on 990529,setpoint of Target Rock Relief Valves Were Found Out of Tolerance During Testing.Caused by Setpoint Drift.Replaced Pilot Assemblies with Certified Spare Pilot Assemblies.With (← links)
- 05000293/LER-1987-003, :on 870211,written Notification Received from Wyle Labs That Two of Four Target Rock (Model 7567F) two- Stage Main Relief Valves Did Not Lift within Tech Spec Requirements.Cause Under Investigation (← links)
- 05000293/LER-1988-020, :on 880711,automatic Start of Emergency Diesel Generator B Occurred When Emergency 4,160 Volt Ac Bus A-6 Intentionally Deenergized for Mod Work.Caused by Personnel Error.Emergency Switch Position Added to Sheet (← links)
- 05000293/LER-1999-001, :on 990412,environ Enclosures of MCCs Outside Design Basis,Were Found.Caused by Failure to Translate Design Function of Pressure Relieving Devices.Removed Obstructions of Pressure Relieving Devices.With (← links)
- 05000293/LER-1988-024-01, :on 881017,Group 1 Isolation Signal Due to High Water Level in Reactor Vessel Occurred.Caused by Disassociation of Pin from Feedback Cam Linkage of Valve Positioner for Valve.Linkage Secured (← links)
- 05000293/LER-1988-023, :on 881012,automatic Actuation of Secondary Containment & Standby Gas Treatment Sys Occurred.Caused by Util Licensed Operator Error.Shift Licensed Operators Being Retrained Re Reactor Protection Sys (← links)
- 05000293/LER-1986-012, :on 860516,determined That Once/Cycle Automatic Actuation Test of HPCI Does Not Meet Full Intent of Tech Spec 4.5.C.1.a.Caused by Insufficient Tech Spec Implementing Procedures.Procedures Will Be Revised (← links)
- 05000293/LER-1988-022, :on 881010,full Scram Signal Occurred.Caused by Cognitive Util Operator Error.Operator Reclosed Breaker & Energized Reactor Protection Sys Channel a Logic Circuitry (← links)
- 05000293/LER-1987-004, :on 870218,dry Chemical Fire Suppression Sys of Piping Trench Below Emergency Diesel Generator Discovered Inoperable.Caused by Personnel Error.Work Prioritization Identification Requirements Reviewed (← links)
- 05000293/LER-1998-001, :on 980127,single Failure Vulnerability of EDG Fuel Oil Supply Sys Was Noted.Caused by Failure to Clearly Translate Design Basis Assumptions Into Licensing Basis. Reviewed Affected Calculations & Determined Operability (← links)
- 05000293/LER-1986-019, :on 860715,recirculation Pump Trip Sys & Alternate Rod Insertion Sys Declared Inoperable Due to Insufficient Monthly ATWS Surveillance Procedure.Caused by Tech Spec Change.Tech Spec Revised (← links)
- 05000293/LER-1998-029, :on 981231,discovered That Intake Structure Indoor Air Temp Was Less than Winter Design Temp,Per Ufsar. Caused by Lack of Info & Administrative Controls.Will Repair Ventilation Sys & Will Revise Procedures.With (← links)
- 05000293/LER-1986-014, :on 860610,once/cycle Simulated Automatic Actuation Test of RCIC Sys Found Inadequate.Caused by Insufficient Tech Spec Implementing Procedures.New Procedure Developed to Test Wiring (← links)
- 05000293/LER-1997-020, :on 971104,RHR Operating Procedure Did Not Reflect Analysis.Caused by Inadequate Translation of Analysis Parameters to Operating Procedure Parameters. Revised Procedure 2.2.19.5 (← links)
- 05000293/LER-1997-018, :on 971104,plant Operation Was Outside of Environmental Qualification Envelope Were Noted.Caused by Nonconservative Drywell Temperature Profile.New EQ Profiles Were Produced for 65 F & 75 F SSW Inlet Temp (← links)
- 05000293/LER-1997-021, :on 971104,EDG Ambient Air Temperature Was Noted.Caused by Ambiguity in Fsar.Conservative Operability Evaluation Has Been Completed to Show That Diesels Are Operable to 95 F (← links)
- 05000293/LER-1997-019, :on 971104,discovered That Closure of RBCCW Sys Valves Which Isolate non-essential Heat Loads Were Not Translated Into Procedure.Caused by Inadequate Design Control.Performed SE & Revised Procedures (← links)
- 05000293/LER-1997-022, :on 971028,temporary Power Cables & Extension Cords Were Found Draped or Tie Wrapped to Class 1E Conduits in Reactor Bldg,In Violation of Electrical Separation Criteria.Caused by Inadequate Procedure.Procedure Revised (← links)
- 05000293/LER-1998-027, :on 981221,switchgear Room B Determined to Be Inoperable.Caused by Normal Wear.New Procedure Being Developed to Include Type of Weld Repair,Necessary to Repair Door (← links)
- 05000293/LER-1998-028, :on 981230,CR High Efficiency Air Filtration Sys Relative Humidity Switches Were Inoperable.Caused by Gradual Degradation of Nylon Filaments.Modified Sys Control Circuitry.With (← links)
- 05000293/LER-1997-024, :on 971023,plant Valve Configuration for Inerting Primary Containment Was Outside Design Basis.Caused by Failure to Recognize Procedure Specified Valve line-up Could Result in Bypass Flow Path from Drywell Atmosphere (← links)
- 05000293/LER-1986-013, :on 860530,discovered That LER for 840227 Discovery of Installation of Seismically Unqualified GE Cfd Relays for Diesel Generator Differential Protection Had Not Been Submitted.Relays Tripped on 860426 (← links)
- 05000293/LER-1997-030, :on 971224,misapplication of FSAR Drywell Free Volume Was Identified.Caused by Unclear Basis for FSAR Table 5.2.1 Value.Engineering Evaluation Confirming Operability Was Completed on 980108 (← links)
- 05000293/LER-1997-029, :on 971216,SDC Suction Valves Were Vulnerable to Damage from Potential Failure Mode Involving Hot Shorts. Caused by Failure to Recognize New Failure Mode Described in NRC in 92-18.Implemented Temporary Mod (← links)
- 05000293/LER-1997-028, :on 971217,intake Structure in Configuration Was Inconsistent W/Tornado Depressurization Analysis Assumptions.Caused by Inadequate Control of Tornado Barriers.Revised Station Tornado Procedure (← links)
- 05000293/LER-1998-026, :on 981202,HPCI Sys Declared Inoperable.Caused by Failed Power Inverter.Failed Inverter Replaced. with (← links)
- 05000293/LER-1998-004-01, Forwards LER 98-004-01 Re EDG Room Air Temp Being Below Design Basis.Resolution of Issues Contained in LER 98-018-00 Has Been Separated & Actions for Low Temp Resolution Are Discussed in Encl.No New Commitments Made (← links)
- 05000293/LER-1997-026, :on 971206,automatic Scram Was Initiated.Caused by High Reactor Water Level During Power Ascension.Pilot Valve Clip Was Repositioned Inside Bailey Positioner & Valve Was Stroked Smoothly (← links)
- 05000293/LER-1998-025, :on 981118,setpoint of Target Rock Relief Valve Was Found out-of-tolerance During Testing.Caused by Setpoint Drift.Valve Was Disassembled,Inspected & Reworked by Target Rock Corp Personnel.With (← links)
- 05000293/LER-1986-011, :on 860419,during Local Leak Rate Testing of Msiv,Five Atwood & Morrill Y-Pattern,20-inch,Model 20849-H MSIVs Discovered to Have Leakage in Excess of Tech Spec 4.7.A.2 Requirements (← links)
- 05000293/LER-1997-027, :on 971128,EDG Winter Ambient Air Temp Occurred.Caused by Ambiguity in Fsar.Compensatory Measures Will Be Instituted When Diesel Generators Not Running (← links)
- 05000293/LER-1997-011-02, Forwards LER 97-011-02 Re SSW Sys Single Failure Vulnerability IAW 10CFR50.73.Commitments Made within Ltr, Submitted (← links)
- 05000293/LER-1986-008, :on 860404,main Steam Line Isolation Automatic Closure Initiated Reactor Scram.Cause Under Investigation. Reactor Shut Down Pending Determination of Cause (← links)
- 05000293/LER-1978-051-01, /01X-0 on 781030: of Operable SRMs Was Reduced Below Minimum Req When SRM a Was Jumpered to Eliminate Problems W/Downscale Rod Block.Caused by Inadvertent Jumpering of Entire a SRM Trip Logic.Procedures Being Rev (← links)
- 05000293/LER-1978-051, Forwards LER 78-051/01X-0 (← links)
- 05000293/LER-1978-050-04, /04T-0 on 781106:Yankee Environ Lab Indicated That 63pGi/kg of CO-60 Existed in Sample Mussel Meat.This Exceeds by 10 Times the Concentration Measured at Marshfield Control Station.Resulted from New Analysis Technique (← links)
- 05000293/LER-1978-050, Forwards LER 78-050/04T-0 (← links)
- 05000293/LER-1978-047-03, /03L-0 on 781002:Position of Chief Radiol Engr Was Incorp Into PNPS Organization Which Assumed Responsibilities of Health Physics Organization.Caused by Efforts to Improve Quality of Health Physics Prog (← links)
- 05000293/LER-1978-047, Forwards LER 78-047/03L-0 (← links)
- 05000293/LER-1997-014-01, Forwards LER 97-014-01 Re Transmitters Not Calibr in Accordance W/Tech Specs,Per 10CFR50.73.Ltr Contains Listed Commitment (← links)
- 05000293/LER-1987-023, :on 870917,automatic Actuation of Emergency Diesel Generator a Occurred.Caused by Procedural Deficiency. Procedure 3.M.3-1,Attachment V Revised to Add Addl Info to Caution Statement (← links)
- 05000293/LER-1988-005, :on 880202,automatic Actuation of Portions of Primary Containment & Reactor Bldg Isolation Control Sys (Pcis/Rbis) Occurred.Caused by Pcis/Rbis Logic Relay Coil Failure.Logic Relay Coil Replaced (← links)
- 05000293/LER-1988-003, :on 880130,setpoints of Degraded Grid Voltage Relays Identified as Too Low.Caused by Incorrect Assumption Made in Model Used for Voltage Analysis Originally Performed in 1976.Addl Analysis & Review Being Performed (← links)
- 05000293/LER-1988-001, :on 880106,automatic Isolations of Portions of Primary Containment & Reactor Bldg Isolation Control Sys Occurred.Caused by Failure in Logic Relay 16A-K57.Coil in Relay Replaced & Other Relay Coils Analyzed (← links)
- 05000293/LER-1998-015-01, Forwards LER 98-015-01, Non-Conservative Degraded Voltage Trip Setpoint, Per 10CFR50.73.Supplement to LER 98-014-00 Was Scheduled to Be Issued 981130,but Will Now Be Issued Once Evaluation & Design Calculations Have Been Com (← links)
- 05000293/LER-1999-003, :on 990516,discovered That LLRT Results Exceeded Allowable TS Leakage Rates.Cause Indeterminate. Affected Valves Were Disassembled & Inspected & Damaged or Worn Parts Were Reworked or Replaced.With (← links)
- 05000293/LER-1998-024, :on 981015,determined That CR High Efficiency Aire Filtration Sys (Crheafs) Found Outside Design Basis Due to Installation of Duct Tape on Trains a & B Crheafs Supply Fans.Installed Mechanical Seals on Crheafs Supply Fans (← links)
- 05000293/LER-1988-016, :on 880517,unexpected Actuation of Inboard Portion of Reactor Bldg Isolation Control Sys Occurred, Resulting in Closure of Train a Isolation Dampers.Caused by Personnel Error.Work Process Revised (← links)
- 05000293/LER-1998-023, :on 981005,incorrect Wiring Mods Affected RBCCW Train B Alternate Shutdown Panel.Caused by Error Made During Preparation of Electrical Connection Drawing to Implement Plant Design.Blown Fuse Replaced.With (← links)
- 05000293/LER-1998-022, :on 981002,unplanned Actuation of a EDG Occurred During Surveillance Test of Related Logic Sys Testing.Caused by Util non-licensed I&C Technician Error. Will Review Surveillance Procedures.With (← links)
- 05000293/LER-1988-015, :on 880504,inadvertent Actuation of Portions of Primary Containment Isolation Control Sys & Reactor Bldg Isolation Control Sys Occurred.Caused by Technician Removing Wrong Fuse from Logic Panel.Fuse Reinstalled (← links)
- 05000293/LER-1988-012, :on 880425,automatic Start of Loop a Reactor Bldg Closed Cooling Water Sys Pump a Occurred.Caused by Accelerated Wear Induced Failure of Coupling in Pump B. Failed Coupling Replaced & Addl Measures Taken (← links)
- 05000293/LER-1988-013, :on 880425,inadvertent Manual Start of Emergency Diesel Generator (EDG) B Occurred.Caused by Personnel Error.Improvements to Local Control Panel to EDG Identified & Tracked (← links)
- 05000293/LER-1988-014, :on 880426,automatic Closing of Outboard Primary Containment Sys Group 6 Isolation Valves Occurred. Caused by Failure of Coil of Outboard Primary Containment Isolation Control Sys.Coil & Fuse Replaced (← links)
- 05000293/LER-1998-021, :on 980902,inadequate Fuel Supply for EDGs Was Noted.Root Cause Analysis Is Being Performed.Revised Calculation Control Process to Ensure Consistency with FSAR (← links)
- 05000293/LER-1988-011, :on 880331,reactor Bldg Isolation Control Sys Inadvertently Actuated,Resulting in Automatic Closing of Secondary Containment Sys Ventilation Dampers.Caused by Personnel Error.Procedure Improvement Started (← links)
- 05000293/LER-1988-021, :on 880719,discovered Problem Involving Solenoid Valves Installed in safety-related Applications. Caused by Incorrect Assumption.Mod Prepared to Replace Four Valves & Form Specifying Design Data Revised (← links)
- 05000293/LER-1985-034, :on 851231,discovered That 21 Fire Dampers Required by Tech Specs Found Degraded.Caused by Insufficient Installation Instructions & Improper Rev to Design Change During Mod Work in 1980-1984 (← links)
- 05000293/LER-1988-018, :on 880705,full Scram Signal Occurred.Caused by Procedure Weakness & Previous Administrative Controls That Were Not Entirely Adequate for Previous Changes Made to Procedure.Procedure Revised (← links)
- 05000293/LER-1988-010, :on 880311,automatic Actuation of Portion of Primary Containment Isolation Control Sys Occurred.Caused by Blown Fuse in Inboard Containment Logic Circuitry During Removal of Temp Switch.Fuse Replaced (← links)
- 05000293/LER-1988-008, :on 880226,automatic Closing of Primary Containment Sys Group 6 Isolation Valve Occurred.Caused by Momentary Flow Fluctuation in RWCU Sys.Util Evaluating Components Installed in Flow Sensing Lines (← links)
- 05000293/LER-1988-024, :on 871006,safety-related 4160 Vac Load Ctr Breaker 152-508 Tripped Causing Loss of Power to 480 Vac Emergency Bus B-1.Cause Undeterminded.Equipment Returned to Svc (← links)
- 05000293/LER-1988-007, :on 880223,unexpected Automatic Actuation of Primary Containment Isolation Control Sys & Reactor Bldg Isolation Control Sys Occurred.Caused by Removal of Fuse from Power Supply of Circuit.Fuse Replaced (← links)
- 05000293/LER-1978-053-01, /01T-0 on 781116:during Repair of Fire Hydrant Facing Condenser Retube bldg,shut-off Valve Blew Off Line Causing Local Flooding & Removal of Fire Suppression from Svc.Cause Was Improper Reinstallation at Retube Bldg Constr (← links)
- 05000293/LER-1978-053, Forwards LER 78-053/01T-1 (← links)
- 05000293/LER-1978-052-03, /03L-0 on 781028:SJAE Offgas Radiat Monitor Readings Were Low Caused by Shut Block Valve to FCV-118. Valve Was Opened.Proper Flow Rate Established.Valve Will Be Properly Identified in Future by Personnel (← links)
- 05000293/LER-1978-052, Forwards LER 78-052/03L-0 (← links)
- 05000293/LER-1978-048-03, /03L-0 on 781009:reactor Scrammed on a Load Rejection Causing Generator Lockout Relay Trip.Cause Was Excessive Pilot Seat Leakage Keeping Second Stage & Main Valve Open.Relief/Safety Valve Replaced (← links)
- 05000293/LER-1978-048, Forwards LER 78-048/03L-0 (← links)
- 05000293/LER-1978-049-03, /03L-0:on 781011,while Performing Surveillance Testing on Diesel Generator B,Generator Output Breaker Tripped Due to Short from One Coil to Stator.Caused by Loose Laminations.Coils Replaced & Test re-run Satisfactorily (← links)
- 05000293/LER-1978-049, Forwards LER 78-049/03L-0 (← links)
- 05000293/LER-1987-022, :on 870607,automatic Actuation of Reactor Bldg Isolation Control Sys (Rbis) Occurred.Caused by Failed Relay (K2) in Channel B Trip Circuit.Secondary Containment Isolation Signal Cleared & Reset (← links)
- 05000293/LER-1997-003, :on 970215,manual Scram Occurred Due to Increasing Rwl During Power Reduction for Refueling Outage. FW Regulating Valves FV-642A & FV-642B & Startup FW Regulating Valve FV-643 Tested (← links)
- 05000293/LER-1988-002, :on 880117,full Scram Trip Signal Followed by Incomplete Automatic Actuations Occurred.Caused by Inadequate Procedure & High Resistance of Contacts in Logic Relay.Procedure Revised & Logic Relay Replaced (← links)
- 05000293/LER-1988-009, :on 880304,documentation for Completion of Surveillance Procedure 8.9.13 Not Located for Diesel Generator B.Cause Undetermined.Operating Supervisor Required to Log Initiation & Completion of Tests (← links)
- 05000293/LER-1978-046-03, /03L-0 on 781006:oxygen Analyzer Valves CV-5065-12,CV-5065-16 & CV-5065-25 Appeared Inoperable,But Local Observation Showed Valves Working Properly.Caused by Switch Misalignment.Ler Inconsistent W/Ler in Cover Ltr (← links)
- 05000293/LER-1978-046, Forwards LER 78-046/03L-0 (← links)
- 05000293/LER-1987-019, :on 871217,RWCU Sys Operation Interrupted Due to Actuation of RWCU Sys Portion of Primary Containment Isolation Control Sys.Caused by Personnel Error.Fuse Replaced & Isolation Reset (← links)
- 05000293/LER-1978-045-03, /03L-0:on 780926,indicator Needle for TI-5047 Water Temp Gauge Snapped Off from Dusting.Caused by Needle Being Exposed by Broken Protective Covering (← links)
- 05000293/LER-1988-004, :on 880202,unplanned Automatic Actuations of Portions of Primary Containment & Reactor Bldg Isolation Control Sys Occurred.Caused by Inadequate Instructions. Sys Restored to Svc.Instructions Revised (← links)
- 05000293/LER-1987-020, :on 871217,fire Damper CPR-2 Failed to Close. Caused by Clover Hook Catching on Edge of Damper Blade.Hooks Changed So Open Side of Hook Faces Away from Damper Blades (← links)
- 05000293/LER-1987-018, :on 871123,24 & 26,automatic Actuations in RWCU Sys Portion of Primary Containment Isolation Control Sys Occurred.Caused by Partially Clogged Pressure Gauge Snubbers & Failed Coil (← links)
- 05000293/LER-1978-054-03, /03L-0 on 781115:during Test of Reactor Water Level,Level Switches L1S-263-57A&B Observed to Trip at Values Greater than Specified in Tech Specs.Caused by Minor Setpoint Drift (← links)
- 05000293/LER-1978-054, Forwards LER 78-054/03L-0 (← links)
- 05000293/LER-1978-040-03, /03L-0 on 780808:time Delay Relay Tdu 2E-K5B Settings Were Incorrect Due to Minor Setpoint Drift. Adjustments Were Made.(Encl to 7809180302 (← links)
- 05000293/LER-1978-040, Forwards LER 78-040/03L-0 (← links)
- 05000293/LER-1986-003, :on 860211,480 Volt safety-related Bus B-20 Inadvertently Deenergized During Electrical Maint on nonsafety-related Cable.Caused by Mgt Deficiency.Cable Repaired.Temporary Mod Procedure Implemented (← links)
- 05000293/LER-1997-009, :on 970417,RCIC Sys Became Inoperable.Caused by Gear Change in Motor Operator of RCIC Sys Flow Test Valve. RCIC Sys Procedures for Potential Rev Reviewed (← links)
- 05000293/LER-1997-005, :on 970308,declared Turbine Bldg Effluent Monitoring Instrumentation Inoperable.Caused by Failed Power Supply to RT-1001-610.Will Perform Initial Rept Screening & Counseled Personnel on Human Error (← links)
- 05000293/LER-1986-006, :on 860316,reactor Shut Down Due to Increase in Drywell Leakage.Caused by Cracked Weld at Reducing Coupling That Joins Reactor Water Instrument Line to Reactor Vessel Penetration N-16A.Piping Repaired (← links)
- 05000293/LER-1997-007, :on 970401,safeguard Buses Were de-energized Due to Severe Storm.Replacement of Microprocessor Control Units Installed in Voltage Regulating Transformers (← links)
- 05000293/LER-1984-016, :on 841207,power Lost to 120-volt Ac Safeguards Bus (Y4) B.Caused by non-licensed Cognitive Personnel Error. Power Loss Resulted in Group 6 Containment Isolation. Personnel Counseled (← links)
- 05000293/LER-1985-033, :on 851127,during Insp 85-32 Identified That Monthly Instrument Channel Checks of Main Stack & Reactor Bldg Vent Waste Gas Monitors Not Performed,Per Tech Spec Section 4.8.B.10.New Procedure Developed (← links)
- 05000293/LER-1985-032, :on 851125,5 of 16 Main Steam Line High Flow Switches Found Outside of Required Setpoint During Routine Primary Containment Isolation Sys Surveillance.Caused by Improper Alignment of Switch Linkage (← links)
- 05000293/LER-1985-027, :on 850919,LPCI Injection Valve Would Not Open During Testing.Caused by Failed Motor in Valve Motor Operator.Motor Replaced (← links)
- 05000293/LER-1997-008, :on 970312,setpoint of Target Rock Relief Valve Pilot Assembly Was Out of Tolerance During Testing,Due to Setpoint Drift.Valve Was Disassembled,Inspected & Reworked by Target Rock Corp Personnel (← links)
- 05000293/LER-1997-006, :on 970321,inadvertent Group Three Isolation Occurred While Troubleshooting 125 Volt Dc Ground on Battery a as Result of Relay Race When Circuit Breaker D4-8 Was Cycled.Electrical Print Reviewed & Verified (← links)
- 05000293/LER-1986-001, :on 860106,unplanned Reactor Scram Occurred During Plant Startup Due to Low Reactor Water Level Being Controlled Manually.Caused by Operator Error.Personnel Counseled & Evaluation Initiated (← links)
- 05000293/LER-1978-002-01, /01X-1:on 780120,100-ft Shielding Mast Fell Across 345 Kv Yard Bus Works & Interrupted Power to Startup Transformer from Transmission Line 355.Caused by Cyclical Fatigue Cracking at Stress Points Due to Wind (← links)
- 05000293/LER-1985-021, :on 850814,two Main Steam Line Radiation Monitors Had Trip Setpoints Greater than Tech Spec Requirements.Caused by Nonlicensed Util Personnel Error. Setpoints Adjusted within Tech Spec Limits (← links)
- 05000293/LER-1985-031, :on 851029,min Shift Crew Composition Not Met. Caused by Misinterpretation of Note B in Tech Spec Table 6.2-1 & Procedure 1.3.34.Shift Crew Composition Changed & Personnel Counseled on Tech Spec Requirements (← links)
- 05000293/LER-1985-030, :on 851030,during Review of NRC Insp 85-26, Discovered That,Control to Tech Spec 4.6.A.5,Procedure 2.1.9.A Did Not Require Logging of Dome & Bottom Head Drain Temps When Starting Recirculation Pump (← links)
- 05000293/LER-1985-016, :on 850704,weekly Analysis for Gross Radioactivity of Reactor Bldg Vent Particulate Filter Not Performed Per Tech Specs.Caused by Nonlicensed Util Personnel Error.Personnel Counseled (← links)
- 05000293/LER-1997-002, :on 970206,SJAE Sampling Was Not Performed in Accordance with Ts.Caused by Improper Conclusion Contained in Response to Request for Licensing Interpretation in 1990. Validation Project Is Now Complete (← links)
- 05000293/LER-1985-029, :on 851018,HPCI Inverter Circuit Failure Alarm & ATWS Trouble Alarm Received in Control Room Due to Breaker Trip.Caused by Fluctuation of Input Voltage.Hpci Inverter Previously Modified (← links)
- 05000293/LER-1977-049-13, /13C-0:on 771123,contractor Repairman Received Whole Body Exposure in Excess of 10CFR20.101b Limits.Caused by Inadequate Communications.Inner Door of Restricted Area Was Chained to Prevent Recurrence (← links)
- 05000293/LER-1985-028, :on 851010,discovered All Active Components of Standby Gas Treatment Sys Not Documented as Tested.Caused by Previous Mgt Deficiency.Tech Spec Implementing Procedure Revised (← links)
- 05000293/LER-1985-022, :on 850812,part of Maint Hot Shop Ventilation Contaminated & Provided Unmonitored Release Path to Environ. Caused by Design Inadequacy.Associated Fan & Breaker Tagged & Ductwork Inlet Sealed (← links)
- 05000293/LER-1997-001, :on 970120,very Small Quantity of Unaccountable Special Nuclear Material Was Identifed Due to Less than Effective Methods for Control & Accounting of Devices. Procedures Revised (← links)
- 05000293/LER-1985-020, :on 850726,operations Personnel Notified by Chemistry Group That Emergency Diesel Fuel Oil Storage Tank a Test Results Did Not Meet Tech Spec Criteria.Caused by Personnel Error & Procedural Inadequacy (← links)
- 05000293/LER-1996-010, :on 961003,TS Required Composite Analysis Were Not Always Performed for Neutralizing Sump Discharges.Caused by Programmatic Deficiency.Interim Measure Will Be Incorporated Into Procedures 7.9.2. & 7.9.5 (← links)
- 05000293/LER-1985-018, :on 850715,secondary Containment Damper Would Not Fully Close.Tech Spec Compensatory Action Not Taken for 19 H.Caused by Maint Personnel Error.Drive Gears on Damper Aligned & Personnel Counseled (← links)
- 05000293/LER-1985-019, :on 850716,two in-series Secondary Containment Dampers Would Not Fully Close During post-secondary Containment Isolation Insp.Caused by Slippage in Drive Gears.Dampers Will Be Replaced (← links)
- 05000293/LER-1996-008, :on 960918,RBCCW Heat Exchanger Was Declared Inoperable.Caused by through-wall Longitudinal Crack in Channel Cylinder Near Bottom on Lower Partition Plate. Cracks in Walls Repaired (← links)
- 05000293/LER-1985-017, On 850712,secondary Containment Isolation Received During Routine High Drywell Pressure,Low Water Level & High Radiation Sys Functional Test.Caused by Personnel Error.Personnel Counseled (← links)
- 05000293/LER-1996-004, :on 960409,low Voltage Power Containment Electrical Penetrations with Degraded Electrical Protection Occurred.Caused by Unawareness of Coordination Requirements. Circuits Breakers Replaced (← links)
- 05000293/LER-1985-015, :on 850624,both Trains of Standby Gas Treatment Sys Started After Secondary Containment Isolation Received. Caused by Operator Error.Operations Personnel Instructed in Handling of Radiation Monitors (← links)
- 05000293/LER-1985-025, :on 850901,reactor Scram Occurred When Insulator in Switchyard Arced to Ground & Disintegrated. Caused by Salt Buildup Resulting from Storm.Insulator Replaced & Washdown Procedures Reviewed (← links)
- 05000293/LER-1985-026, :on 850830,during QA Audit of Operations, Failure to Perform Instrument Check of 28-volt Control Rod Position Indicating Lights Indicated.Caused by Inadequate Surveillance Procedure.Procedure Modified (← links)
- 05000293/LER-1985-023, :on 850827,HPCI Turbine Control Valve Failed to Operate Properly.Caused by Leaking Nipple Due to Personnel Inadvertently Stepping on Oil Supply Line to HPCI Hydraulic Control Valve.Nipple Repaired (← links)
- 05000293/LER-1985-024, :on 850602,surveillance Test of Station 250-volt Batteries Missed.Caused by Procedural Deficiency. Procedure Revised & Batteries Retested (← links)
- 05000293/LER-1985-014, :on 850615,unplanned Reactor Scram Occurred Due to MSIV Isolation of High Water Level.Caused by Personnel Error.Personnel Counseled (← links)
- 05000293/LER-1996-009, :on 960925,false High Reactor Vessel Pressure Signal Occurred.Caused by Deficiency in Procedure.Revised Procedure Used for Backfilling Applicable Reactor Vessel Pressure Transmitters (← links)
- 05000293/LER-1985-013, :on 850529,HPCI Sys Isolated During Steady Operation Due to False Steam Line High Flow Signal from Differential Pressure Indicating Switch.Caused by Setpoint Shift.Internal Switch Components Replaced (← links)
- 05000293/LER-1985-011, :on 850424,two Absolute Pressure Transmitters Discovered Installed Instead of Required Gauge Pressure Transmitters.Caused by Engineering Oversight.Transmitters Recalibr Per Temporary Mod-85-27 (← links)
- 05000293/LER-1983-012-03, /03L-0:on 830310,during ATWS Channel Surveillance Test,Atws Panel Indicator Showed Half Trip When No Trip Signal Applied.Caused by Neon Light Indicators Sensitive to Spurious Voltages.Design Change Initiated (← links)
- 05000293/LER-1985-010, :on 850412,two in-series Secondary Containment Isolation Dampers Would Not Fully Close.Caused by Slippage in Drive Gears & Cracking Due to Aging & Fatigue.Gears Replaced (← links)
- 05000293/LER-1992-013, :on 921024,automatic Actuation of Main Steam Sys/Group 1 Portion of Primary Containment Isolation Control Sys Occurred Due to False High Rv Water Level Signal. Possible Internal Leakage Paths Addressed (← links)
- 05000293/LER-1992-018, :on 921220,reactor Scram & Closing of Main Steam Isolation Valves Due to Trip Settings of Main Steam Radiation Monitors.Procedure 3.M.2-7.6 Revised to Record Alarm & Trip Settings in Scientific Notation (← links)
- 05000293/LER-1985-002, :on 850128,Tech Spec Implementing Procedures for Surveillance Tests Inadequate.Caused by Mgt Deficiency. Procedures Revised to Include Provisions for Functional Testing of Valve Closure Alarms (← links)
- 05000293/LER-1992-016, :on 921213,automatic Scram Resulting from Load Rejection Occurred While at 48 Percent Reactor Power.Caused by 345 Kv Switchyard Flashovers Due to Salt Deposited During Severe Coastal Storm (← links)
- 05000293/LER-1992-017, :on 921214,primary Containment Isolation Sys Groups 2 & 3 Actuations Occurred During RPS Power Supply Shift.Caused by B RPS Breaker Inadvertently Deenergizing. Operator Counseled (← links)
- 05000293/LER-1985-005, :on 850221,rod Block Monitor Functional & Calibr Surveillance Tests Identified as Having Exceeded Required Test Interval.Caused by Personnel Error.Tests Performed & Personnel Counseled (← links)
- 05000293/LER-1992-014, :on 921124,automatic Actuation of Inboard & Outboard RWCU Sys Portion of Primary Containment Isolation Sys Occurred,Resulting in Closing Group 6 Valves.Caused by Procedure Deficiency.Procedure Revised (← links)
- 05000293/LER-1992-015, On 921125,RCIC Became Inoperable & 7-day LCO Entered.Caused by Turbine Trip Throttle Valve Closing When Valve Linkage Accidently Contacted.Valve Manually Reset & Personnel Counseled & Instructed (← links)
- 05000293/LER-1979-054-03, /03X-0:on 790807,w/incoming Power unavailable,24 Kv Shutdown Transformer Tripped Off Line Via Undervoltage Relay Trip Operation.Caused by Blown Fuse & Relay Trip (← links)
- 05000293/LER-1979-053-04, /04X-0:on 790710 & 0807,temp Rise of Condenser Cooling Water Between Intake Structure & Discharge to Bay Exceeded 32 F.Caused by Seasonally High Ambient Water Temp. No Significant Adverse Effects to Marine Life (← links)
- 05000293/LER-1979-052-03, /03X-0:on 790705,fire Detector Alarm,Initiating from HPCI Turbine Compartment,Annunciated on Panel C114 in Control Room.No Fire Existed.Caused by Moisture in HPCI Area from Steam Leak (← links)
- 05000293/LER-1992-011, :on 920821,unplanned Actuation of Portion of RHR Sys Circuitry Occurred During Logic Sys Functional Test. Caused by Util non-licensed Technician Error.Procedure Changed & Technician Counseled (← links)
- 05000293/LER-1992-010, :on 920818,RCIC Removed from Svc & Made Inoperable to Repair Area Temp Switch Terminal Block Termination Point.Caused by Repeated Torquing of Terminal Screw.Terminal Replaced & Circuitry Tested (← links)
- 05000293/LER-1996-005, :on 960419,automatic Scram Occurred Due to Turbine Vibration During Planned Power Reduction.Turbine Vibration Trip Setting That Initiates Trip of Turbine Due to High Vibration Changed (← links)
- 05000293/LER-1996-002, :on 960205,loss of Valve Position Indication for MO-1301-16 Occurred.Caused by Loose Control Power Fuse in Breaker B1864.Investigation & Troubleshooting Plan Was Implemented (← links)
- 05000293/LER-1985-009, :on 850404,reactor Scrammed from 85% Power as Result of Turbine Trip on High Vibration Signal.Caused by Inadequate Lubrication of Turbine Vibration Detector.Lube Oil Orifice Cleaned & Detector Replaced (← links)
- 05000293/LER-1985-006, :on 850315,reactor Scram from 100% Power Occurred.Caused by False High Reactor Pressure Signal When Valve Momentarily Stuck,Then Released.Valve & Manifold Replaced (← links)
- 05000293/LER-1985-007, :on 850316,two in-series Secondary Containment Isolation Dampers Found Inoperable.Caused by Broken Damper Control Drive Gears.Broken Gears Replaced & Insp Frequency Increased (← links)
- 05000293/LER-1992-012, :on 920916,noted That Recirculation Flow Converters May Not Have Been Calibr During Period 900724- 920916.Caused by Personnel Error.Recirculation Flow Converters Calibr Completed on 920916 (← links)
- 05000293/LER-1984-018, :on 841220,while Shutdown for Refueling,Lpci Valve Found Inoperable.Caused by Worn Teeth on Splined Insert Gear of Motor Operator.Motor Operator Refurbished (← links)
- 05000293/LER-1992-009, :on 920717,during Testing,Actuation Occurred Resulted in Closing of Inboard RWCU Group 6 Isolation Valve. Caused by Temp Switch Not Thermally Stabilized.Temp Switch Will Be Trended Using Existing Procedures (← links)
- 05000293/LER-1984-017, :841219,temporary Loss of Offsite Power Experienced.Caused by Operator Activating Two Stuck Breaker Protection Switches W/O Resetting Corresponding Lockout Relays.Personnel Counseled (← links)
- 05000293/LER-1992-008, :on 920708,setpoint of Target Rock SRV Found Out of Tolerence.Caused by Inability to Achieve Temp Stabilization During Test Due to Leakage Through Pilot Valve Assembly.Pilot Valve Assembly Reworked (← links)
- 05000293/LER-1996-007, :on 960519,LCO for Operation for Switchyard Battery Exceeded Tech Spec.Caused by Personnel Error.Revised Procedure 8.9.8.4 & Revised Master Surveillance Tracking Program Nodes (← links)
- 05000293/LER-1977-031-01, /01X-1:on 770912,base Metal of CRD Return Line Nozzle Penetrated During Grind Out of Indication.Caused by thermal-induced Fatigue Cracking.Crd Line Removed from Sys (← links)
- 05000293/LER-1985-004, :on 850215,reactor Shut Down Due to Small Leak in Socket Weld.Spool Piece & Weld Replaced (← links)
- 05000293/LER-1985-003, :on 850210,reactor Shut Down.Caused by Oil Leak in Recirculation Pump Which Resulted in Bearing Damage.Oil Leak Repaired & Damaged Components Replaced (← links)
- 05000293/LER-1996-003, :on 960403,RCICS Made Inoperable Due to Anomalies Noted During Testing.Caused by Malfunctioning Speed Control Sys Hydraulic Actuator (EG-R).EG-R Replaced & Rcics Declared Operable on 960405 (← links)
- 05000293/LER-1984-015, :on 840929,during Refuel Outage,Unplanned Actuation of Containment Spray Sys Occurred.Caused When Electrician Stroked Upper Drywell Outboard Isolation Valve. Personnel Counseled (← links)
- 05000293/LER-1995-011, :on 951206,RCICS Was Inoperable Due to Unplanned Maint to Replace Intermittent Tripping Power Inverter.Mr 19503503 Was Initiated to Perform Initial Troubleshooting (← links)
- 05000293/LER-1984-012, :on 840920,emergency Diesel Generator B Inadvertently Started During Surveillance Test.Caused by Unplanned Start Due to Nonlicensed Personnel Error.Diesel Secured & Personnel Counseled (← links)
- 05000293/LER-1985-001, :on 850101,reactor Shut Down Due to Inoperable Standby Liquid Control Sys (Slcs).Caused by Debris in SLCS Storage Tank & Test Tank.Slcs Components & Sys Cleaned.W/ (← links)
- 05000293/LER-1992-007, :on 920618,during Quarterly Functional Test, RCIC Sys Made Inoperable Per TS Due to Loose Temp Switch Terminal.Caused by Repeated Torquing of Terminal Screw. Circuitry to Be Changed for Frequent Calibr (← links)
- 05000293/LER-1984-020, :on 841225,Group 1 Containment Isolation Received Due to High Reactor Water Level Signal.Caused by LPCI Valve Not Fully Seated.Lpci Valve Isolated & Reactor Water Level lowered.w/850124 Ltr (← links)
- 05000293/LER-1984-019, :on 841225,Group 1 Containment Isolation Signal Received.Caused by Excess Cooling in Area of Ref Leg a, Inhibiting Ability of Condensing Chamber to Provide Adequate Makeup.Proposed Mods Being Evaluated (← links)
- 05000293/LER-1996-001-01, :on 960312,torus-to-reactor Bldg Vacuum Relief Sys Train B Vacuum Breaker Inoperable Due to Pressure Switch.Replaced micor-switch,tested Pressure Switch Satisfactorily & Returned Vacuum to Svc (← links)
- 05000293/LER-1995-009, :on 950821,discovered Surveillance Procedure 8.5.1.3, Core Spray Motor Operated Valve Quarterly Operability Test Not Performed.Caused by Personnel Error. Appropriate Mgt Attention/Action Taken (← links)
- 05000293/LER-1995-012, :on 951214,core Thermal Power Exceeded Tech Spec Limit Due to Ommission in Calculation.Caused by Nonlicensed Personnel Error.Standing Order Issued (← links)
- 05000293/LER-1992-006, :on 920411,unplanned RPS Scram Signal Occurred While Plant Shut Down.Caused by Licensed Operator Error. RPS Circuitry Reset on 920411 & post-scram Recovery Procedure Will Be Strengthened (← links)
- 05000293/LER-1992-005, :on 920403,actuation of CSCS Logic Circuitry Occurred While Shut Down.Caused by Procedure Deficiency. Procedure Tp 92-020,Rev 0 Retired & Replaced by Procedure Tp 92-022,Rev 0 (← links)
- 05000293/LER-1977-030-03, /03X-1:on 770806,during Normal Shutdown for Refueling Outage 3,CRD 34-11 Remained full-out When Reactor Scrammed.Probably Caused by Foreign Substance Restricting Normal Operation.Crd Replaced (← links)
- 05000293/LER-1992-004, :on 920326 & 27,three Automatic PCIS Group 1 Isolations Occurred During Plant Shutdown Due to False High Rv Water Level Signals.Insulation Removed from B Head Equalizing Line (← links)
- 05000293/LER-1992-003, :on 920325,RCIC Sys Declared Inoperable.Caused by Motor Operator Disconnected from Valve Yoke.Personnel Provided one-time Torque Checking Requirements (← links)
- 05000293/LER-1995-010, :on 951103,individual Salt SWS Pumps Failed to Meet Sr.Caused by Failure to Correctly Translate Basis of TS of 55 Feet TDH to Acceptance Criteria in IST Test.Approved Calculation M630 (← links)
- 05000293/LER-1977-018-03, /03X-1:on 770502,CRD 46-39 Withdrawn Beyond full-out Position.Caused by Badly Bent Uncoupling Rod. CRD 46-39 Removed & Replaced on 770901 During Refueling Outage 3 (← links)
- 05000293/LER-1984-014, :on 840928,while Shut Down for Refueling, Reactor Scram Signal Generated Through Reactor Protection Sys.Caused by Procedural Inadequacy.New Procedure Drafted to Provide Guidance for cross-tying Buses (← links)
- 05000293/LER-1984-013, :on 840920,indications of Cracking in Area of Weld Connecting Reactor Vessel Jet Pump Instrumentation Nozzle to Jet Pump Instrumentation Identified.Caused by Band of 304SS Matl in Weld Assembly.Weld Grinded (← links)
- 05000293/LER-1984-009, :on 840626,HFA Relay in Primary Containment Isolation Sys Found Hot & Smoking.Cause Related to Previously Identified Generic Hfa Relay Problems.Relay Deenergized & Replaced (← links)
- 05000293/LER-1984-011, :on 840828,emergency Diesel Generator a Inadvertently Started.Caused by Spurious ESF Signal.Diesel Generator Secured (← links)
- 05000293/LER-1980-091-03, During Routine Surveillance Testing for Drywell to Torus Vacuum Breaker Operability,Air Operated Valve 5045K Did Not Operate.Hinge Pin Freed & Piston Lubricated (← links)
- 05000293/LER-1980-044-03, RCIC Inboard Isolation Valve Activated & Breaker Tripped.Caused by Valve Electrically Backseating.Valve Motor Burned Out & Contactor Seized.Valve & Operator Replaced (← links)
- 05000293/LER-1979-008-03, HPCI Turbine Tripped. Caused by Ruptured Lower Head Gasket on Gland Seal Condenser.Repairs Completed & Surveillance Test Successfully Performed (← links)
- 05000293/LER-1984-008, :on 840521,HFA Relay in Reactor Protection Sys Found Hot & Smoking.Caused by Generic Hfa Relay Problem. Relay de-energized & Replaced W/Ge Century Series Relay (← links)
- 05000293/LER-1995-008, :on 950814,primary Containment Sys Isolation Valve Was Unable to Close Fully on Automatic Signal Due to Wiring Discrepancy.Trained Personnel for Maint on Specific Event (← links)
- 05000293/LER-1995-007, :on 950804,simulated Automatic Test Was Not Performed for Automatic Depressurization Sys Prior to Plant Restart from Refueling outage-10 Due to Personnel Error. Performed Required SAA Surveillance Test (← links)
- 05000293/LER-1991-024, :on 911030,loss of Preferred & Secondary Offsite Power Occurred Due to Severe Coastal Storm While Shut Down.Caused by Flashover Switchyard Insulator. Westinghouse Type Relay 62/5 Will Be Replaced (← links)
- 05000293/LER-1990-005, :on 900320,480-volt Ac Load Ctr Breaker Did Not Open Automatically as Designed During Planned Bus B6 Transfer.Caused by Missing Retainer Ring.Breaker Sent to GE for Repair.Also Reported Per Part 21 (← links)
- 05000293/LER-1992-002, :on 920227,inadvertent Actuation of Channel a Portion of RB Isolation Control Sys Occurred During Surveillance Test.Caused by Limited Access to Actuating Relay.Procedures Were Revised (← links)
- 05000293/LER-1980-041-03, Isolation Valves 5065-17 & 5065-22 Declared Inoperable.Caused by Valve Limits Being Out of Adjustment.Valve Items Adjusted & Exercised to Provide Correct Operation (← links)
- 05000293/LER-1981-015-03, During Surveillance Testing,Nozzle on 23-ft Level Cardox Sys Hose Reel Failed to Deliver Adequate Stream.Caused by Operator Error.Fire Brigade Training Revised (← links)
- 05000293/LER-1981-009-03, Inboard Isolation Valve Failed to Open & HPCI Sys Declared Inoperable.Caused by Incorrect Min Torque Switch Setting of Motor Operator & Thermal Binding.Torque Switch Set at Max Value (← links)
- 05000293/LER-1995-006, :on 950614,RCIC Sys Made Inoperable for Troubleshooting Problem W/Turbine Steam Supply Valve.Caused by Either Loosened wire-connector or Failed Auxiliary seal- in Relay.Relay Replaced & Wires Checked (← links)
- 05000293/LER-1995-005, :on 950605,drywell-to-torus Portion of Primary Containment Vacuum Relief Sys Actuated.Caused by non- Established drywell-to-torus Atmosphere Differential Pressure.Addl Nitrogen Delivered (← links)
- 05000293/LER-1991-025, :on 911030,RCIC Sys Turbine Tripped as Operators Started Sys for Reactor Vessel Water Level Control.Caused by Mechanical Overspeed Trip & Inverter Trip.Operator Counseled & Trip Reset (← links)
- 05000293/LER-1991-026, :on 911030 & 31,automatic Actuations Occurred in RWCU Sys Portion of Primary Containment Isolation Control Sys.Possibly Caused by Momentary Fluctuations in RWCU Sys Flow.High Flow Sensor Settings Verified (← links)
- 05000293/LER-1991-023, :on 910728,11 of 76 Drywell Head Bolts Discovered Loose During Integrated Leak Rate Test.Caused by Failure of spherical-type Washer Sets & Use of Wrong Matl. Washer Sets Replaced & Procedure Revised (← links)
- 05000293/LER-1983-054-03, /03L-0:on 831014,during steady-state Operation, Downscale Monitor Alarm Observed for Offgas Monitor 1705-3A. Caused by Dirty Signal Connector.Signal Connector Cleaned. Monitor Successfully Tested (← links)
- 05000293/LER-1983-051-03, During steady-state Operations,Drywell Airborne Leak Detection Sys Found Inoperable.Caused by Low Flow Particulate Sys Traced to Water Clogged Filter & Leak in Sensing Line (← links)
- 05000293/LER-1991-021, :on 911009,RCIC Declared Inoperable Due to Lack of Sufficient Battery Charger Test Data.Caused by Unavailability of Backup Battery Charger.Alarm Response Procedure for Alarm Window I4 Changed (← links)
- 05000293/LER-1991-003, :on 910307,HPCI Sys Made Inoperable When Two HPCI Turbine Steam Exhaust Vacuum Breaker Containment Isolation Valves Discovered Closed.Caused by Loss of Fill Oil in Transmitter.Transmitter Replaced (← links)
- 05000293/LER-1983-025-03, /03L-0:on 830425,during Fire Protection Surveillance,Sliding Door in Switchgear Room Did Not Fully Close.Caused by Interference Between Knot in Counterweight Rope & Security Barrier.Knot Removed (← links)
- 05000293/LER-1984-002, :on 840318,during Refueling Outage,Hfa Relay in Reactor Protection Sys Found to Be Hot & Smoking.Cause Attributed to Generic Hfa Relay Problems.Corrective Actions Will Be Included in IE Bulletin 84-02 Response (← links)
- 05000293/LER-1984-001, :on 840316 & 27,full Scram Signal Generated.No Fuel in Vessel & All Control Rods Valved Out During Events. Caused by Personnel Error.Operations Personnel Counseled on Cause of Event (← links)
- 05000293/LER-1984-003, :on 840319,discovered Once/Cycle Diesel Generator Fire Pump Surveillance Test Not Performed Per Tech Specs.Pump Declared Inoperable.Caused by Incorrect Info in Surveillance Tracking Program Data Base (← links)
- 05000293/LER-1980-004-01, Results of Core Spray Sparger Cracks in Conjunction W/Inservice Insp Program Revealed Several Linear Indications on Each Sparger.Visual Insps Conclude Indications within Criteria (← links)
- 05000293/LER-1983-060-03, /03L-0:on 831129,alarm Observed Indicating Low Nitrogen Pressure in Control Rod Drive 10-11 Accumulator. Caused by Leaking Accumulator Gas Charging Valve Seat.Valve Cartridge 111 Replaced & Successfully Tested (← links)
- 05000293/LER-1983-059-03, /03L-0:on 831129,while Performing Operations Daily Instrument Check Surveillance,Torus Temp Recorder TRU-9045 Found to Be Recording Downscale.Cause & Completion of Corrective Action Deferred to Refuel Outage (← links)
- 05000293/LER-1983-058-03, /03L-0:on 831012,mainstack Monitor Sys Lost Flow When Sample Pump Tripped.Caused by Low Output Pressure from Pressure Switch Due to Newly Installed Rebuilt Pump.Second Rebuilt Pump Installed (← links)
- 05000293/LER-1983-057-01, /01T-0:on 831118,during Administrative Review of Tech Spec Surveillance Requirements,Discrepancies Found in Three Testing Areas.Caused by Administrative Error.Procedure Changes Initiated (← links)
- 05000293/LER-1991-020, :on 910815,RCIC Declared Inoperable & Seven Day Tech Spec LCO Entered.Caused by Turbine Speed Oscillations Occurring Minutes After Steady operation.EG-R Replaced & Turbine Speed Control Sys Adjusted (← links)
- 05000293/LER-1991-018, :on 910710,setpoints of Degraded Voltage Relays Discovered Too Low Probability Degraded Voltage Conditions. Cause Unknown.Mods Planned to Replace Applicable Control Power Transformers (← links)
- 05000293/LER-1991-019, :on 910525,circuit Breaker of safety-related Bus Transfer Scheme Discovered Open.Caused by Interference Between Breakers Forged Type Trip Latch Roller.Circuit Breaker Repaired by GE Personnel (← links)
- 05000293/LER-1995-003, :on 950324,manually Initiated RPS Scram Signal & Scram Occurred.Caused by Deliberate Movement of Reactor Mode Selector Switch from Run Position.Controller & Linkage Being Replaced (← links)
- 05000293/LER-1995-004, :on 950324,drywell-to-torus Portion of Primary Containment Vaccuum Relief Sys Actuated While de-inerting Drywell.Caused by Deficiency in Approved Procedure Being Used.Revised Procedure to Correct Deficiency (← links)
- 05000293/LER-1983-056-03, /03L-0:on 831021,during steady-state Operation, Discovered Sliding Fire Door W/O Proper Number of Binders. Caused by Installation Oversight.Second Binder Will Be Installed (← links)
- 05000293/LER-1993-003, :on 930301,found Settings of RWCU High Switches Out of Tolerance During Surveillance.Caused Setpoint Drift. Re-calbr DPIS-1243 & DPIS-1244 in Accordance W/Procedure 8.M2-12.1 W/Satisfactory Results 930301 (← links)
- 05000293/LER-1991-017, :on 910720-21,three Automatic Actuations of Portions of Primary Containment Control Sys Occurred.Caused by Air in Sensing Lines.Procedures Revised & Training of Personnel Conducted (← links)
- 05000293/LER-1983-055-03, /03L-0:on 831020,fire Pump Diesel Failed to Start. Caused by Battery Failure.Batteries Replaced & Replacement Batteries Stocked (← links)
- 05000293/LER-1991-005, :on 910325,loss of AC Power to B Train of Safety Sys Occurred.Caused by Failure of Automatic Voltage Regulator.Calibr Frequency to Be Established & Calibr Procedures to Be Developed (← links)
- 05000293/LER-1991-016, :on 910718,settings of Degraded Voltage Relays Found Out of Tolerance During Surveillance.Caused by Differences in Accuracy of Measuring & Test Equipment Used to Calibr Relays (← links)
- 05000293/LER-1983-053-03, /03L-0:on 831007,during Planned Shutdown,Reactor Scram Occurred,Causing Group 1 Containment Isolation.After Signal cleared,MO-220-2 Could Not Be Opened.Caused by Grounded Armature on Motor Operator (← links)
- 05000293/LER-1991-010, :on 910527,secondary Containment Sy Isolation Occurred While Backing Out of Surveillance Testing.Caused by Personnel Error.Test Personnel Counseled & Procedure 8.9.8 Revised (← links)
- 05000293/LER-1991-009, :on 910518,fire Barrier Discovered Breached in Intake Structure.Caused by Personnel Overlooking Tech Spec Barrier.Establishing Continuous Fire Watch in Pump Room & Eliminating Drain Check (← links)
- 05000293/LER-1983-052-03, /03L-0:on 830923,while Performing Monthly HPCI Valve Mo 2301-3 Failed to Open.Caused by Grounded Armature in Motor of Valve Motor Operator.Motor & Circuit Replaced (← links)
- 05000293/LER-1983-050-03, /03L-0:on 830915,fire Watch Established for Inoperable Standby Gas Treatment Sys Fire Deluge Sys Changed from Continuous to 15 Minute Intervals.Caused by Misunderstanding of Word Continuous (← links)
- 05000293/LER-1983-066-03, /03L-0:on 831230,while Performing Weekly Fire Pump Test,Electric Fire Pump Would Not Start W/Auto Initiation Logic.Caused by Frozen Sensing Lines.Lines Thawed (← links)
- 05000293/LER-1983-005-01, Util Operated W/O 0.25% Delta K Shutdown Margin Required Per Tech Spec 3.3.A.1. Caused by Inappropriate Cold Critical Eigenvalue Used in GE Calculations (← links)
- 05000293/LER-1983-017-03, /03L-0:on 830403,drywell Airborne Leak Detection Sys (C-19) Found Inoperable.Caused by Overheated Sample Air Due to Improper Thermostatic Control of Heat Tracing for Sample Lines.Lagging on Lines Removed (← links)
- 05000293/LER-1983-014-03, /03L-0:on 830329,drywell Airborne Leak Detection Sys (C-19) Particulate Channel Found Reading Downscale. Caused by Loose Connector Pin.Pin Repaired & Unit Returned to Svc (← links)
- 05000293/LER-1983-015-03, /03L-0:on 830331,standby Gas Treatment Sys Train Opened W/O Proving Operability of Redundant Train.Caused by Miscommunication Between Insp Crew & Control Room.Need for Proper Communications Emphasized (← links)
- 05000293/LER-1983-062-03, /03L-0:on 831205 & 06,while Conducting Insp of Secondary Containment Dampers,Dampers AO/N-94 & 95 Found to Be Inoperable After Nylon Drive Gears Became Misaligned. Drive Gears Readjusted (← links)
- 05000293/LER-1983-063-01, /01T-0:on 831219,during Insp of Recirculation Sys Piping Welds,Two Indications Found in 12-inch Lines.Cause Tentatively Attributed to Intergranular Stress Corrosion Cracking.Ring Header Will Be Replaced (← links)
- 05000293/LER-1983-068-01, /01T-0:on 831219,during Refueling Operations, Shield Plugs Separating Dryer Separator Pool from Refuel Cavity Not Removed.Caused by Procedural Inadequacy.Procedure Revised (← links)
- 05000293/LER-1982-012-03, /03L-0:on 820430,during steady-state Operation, Diesel Generator a Did Not Respond to Start Signal During Surveillance Test.Caused by Defective Pak Unit.Circuit Repaired (← links)
- 05000293/LER-1991-013, :on 910613,as-found Leak Test Results for Four Feedwater Check Valves Discovered to Be in Excess of TS Limits.Caused by Disc Misalignment,Resulting in Improper Valve Seating.Valve Internals Rebuilt (← links)
- 05000293/LER-1991-011, :on 910604,inadvertent Primary Containment & Secondary Containment Isolation Signal Occurred Due to Util Licensed Operator Error.Responsible Engineer Counseled (← links)
- 05000293/LER-1990-001, :on 900209,two RCS Instrumentation Excess Flow Check Valves Inappropriately Verified Operable Due to Nomenclature Errors in 1987 Excess Flow Check Valve Surveillance Procedure.Two Valves Replaced (← links)
- 05000293/LER-1991-012, :on 910607,inadvertent Automatic Start of EDG a Occurred During Scheduled Surveillance Test While Shutdown for Refueling Outage.Caused by non-licensed Personnel Error (← links)
- 05000293/LER-1994-004, :on 940803,automatic Primary Containment Isolation Control Sys Actuation Occurred.Caused by Improper Alignment of Control Valve Fulcrum Alignment Pins.Vents Added to Oil Sump & Sys Oil Pressure Reduced (← links)
- 05000293/LER-1983-049-03, /03L-0:on 830909,during steady-state Operation, Recirculation Pump a MG Set Inadvertently Tripped.While Changing Out Generator Brushes on a MG Set,Brush Pigtail Inadvertently Shorted Out (← links)
- 05000293/LER-1983-047-01, /01T-0:on 830913,recirculation Pump a low-low Water Level Trip Relay 16A-K8A Found Smoking.Caused by Overheated Relay Coil.Relay Replaced (← links)
- 05000293/LER-1995-001, :on 950101,found That Air Operated Valve in B Vacuum Relief Sys Opened Due to Loose Fuse in Control Circuirty for Solenoid Valve That Controls Air to Air Operated Valve.New Fuse Installed (← links)
- 05000293/LER-1994-007, :on 941228,primary Containment Pressure Boundary Degraded Due to Uninstalled Instrument Plug.Caused by Personnel Error.Isolation Valves Will Be Installed on Selected Instruments (← links)
- 05000293/LER-1991-015, :on 910628,north Wall of a Train Salt Svc Water Pump Room in Intake Structure Discovered Breached. Caused by Broken Two Inch Conduit Fitting.Continuous Fire Watch Established (← links)
- 05000293/LER-1983-046-03, /03L-0:on 830805,control Rod 10-31 Declared Inoperable & Electrically Disarmed in Fully Withdrawn Position.Caused by Piston Seal Deterioration.Control Rod Drive Will Be Replaced (← links)
- 05000293/LER-1983-045-03, /03L-0:on 830802,during Cold Shutdown,Loss of 345-kV Offsite Power Occurred.Emergency Diesel Generators & safety-related Equipment Functioned as Intended.Caused by Lightning Striking Tripping Line 342 (← links)
- 05000293/LER-1983-040-03, /03L-0:on 830703,while Conducting Surveillance Tests,Core Spray Injection Valve 1400-25A Would Not Close. Caused by Loose Stem Nut Preventing Valve Operator from Closing Valve.Stem Nut Tightened (← links)
- 05000293/LER-1983-039-03, /03L-0:on 830702,HPCI Turbine Stop Valve Required More than Normal Time to Open.Hpci Sys Declared Inoperable & Reactor Shutdown Initiated.Caused by Deteriorating Orifice Plate Gasket.Gasket Replaced (← links)
- 05000293/LER-1983-038-03, /03L-0:on 830622,one Signoff Sheet Found Not Initialed for 2 H Period During Unscheduled Supervisory Insp of Fire Patrols.Caused by Failure to Read & Comprehend List of Areas to Be Patrolled.Individual Instructed (← links)
- 05000293/LER-1991-007, :on 910429,TS Required Shutdown Completed Due to Drywell Floor Sump Leakage Rate & Subsequent Scram Signal While Shutdown.Seal Cartridges Replaced & Responsible Operator Counseled (← links)
- 05000293/LER-1979-050-03, HPCI Exhaust Line Snubber SS-23-3-31 Strut Assembly Found Bent & Thread Assembly Out of Wall Mount.Caused by Transient Hydro Shock. Snubbers Upgraded & Addl Snubbers Added (← links)
- 05000293/LER-1983-035-03, /03L-0:on 830610,three of Four Motor Operator Mounting Cap Screws Found Backed Out of Core Spray Test Valve MOV 1400-4A.Caused by Insufficient Cap Screw Torque. Screws Coated & Torqued (← links)
- 05000293/LER-1994-006, :on 940917,unplanned Actuation of Portion of Channel B Core Standby Cooling Sys Logic Circuitry Occurred.Caused by Inadequate Plant Impact Reviews for Activity Performed.Procedure Revised (← links)
- 05000293/LER-1983-044-03, /03L-0:on 830725,inboard MOV-1301-16 Did Not Close During RCIC Surveillance Test.Outboard Isolation Valve Closed & Sys Declared Inoperable.Caused by Defective Belleville Spring Pack.Motor Operator Rebuilt (← links)
- 05000293/LER-1983-041-03, /03L-0:on 830713 & 15,latch on Fire Doors 162 & 105,respectively,found Inoperable.Caused by Normal Wear. One Latch Mechanism Required Adjustment.Second Latch Replaced (← links)
- 05000293/LER-1983-043-03, /03L-0:on 830728,offgas Radiation Monitor 1705-3A Found Out of Calibr in Nonconservative Direction.Caused by Instrument Drift.Monitor Recalibr & Returned to Svc (← links)
- 05000293/LER-1981-059-03, Acceptance Criteria for Test 8.7.3,Secondary Containment Leak Rate Test, Not Met. Caused by Damper Alignment Reducing Capability.Engineering Evaluations Added to Procedure (← links)
- 05000293/LER-1983-019-03, /03L-0:on 830410,sprinkler Head Supply Pipe on Top of Turbine Stop Valves Found Severed W/Water Running from Pipe.Probably Caused by Pipe Fatigue Due to Vibration.Pipe Threaded,Installed & Visually Inspected (← links)
- 05000293/LER-1983-023-03, /03L-0:on 830420 & 0504,diesel Generator Fuel Pump Belt a Broke.Caused by Improper Installation.Detailed Instructions Written & Belt Replaced (← links)
- 05000293/LER-1983-042-03, /03L-0:on 830718,insp of Fire Wall Penetrations Revealed Conditions Contrary to Tech Spec 3.12.F.Deviations Not Identified in Previous Insps.Request Initiated to Revise Survey & Correct Deviations (← links)
- 05000293/LER-1983-024-03, /03L-0:on 830421,drywell Airborne Leak Detection Sys (C-19) Particulate Channel Found Inoperable.Caused by Failure of Heat Tracing on Sensing Line to Particulate Detector.Heat Tracing Repaired (← links)
- 05000293/LER-1983-018-03, /03L-0:on 830408,during Insp,Standby Gas Treatment Sys B Heater Contact & Wiring Found Burnt,Rendering Sys Inoperable.Caused by High Resistance Due to Loose Wires at Contactor Terminal.Contactor & Wires Replaced (← links)
- 05000293/LER-1983-016-03, /03L-0:on 830402,overload Annunciation Received When MOV-220-2 Switched Open During Scram Recovery.Probably Caused by Spurious Annunciator from Overload Mechanism in Cutler-Hammer Motor Control Ctr.Valve Returned to Svc (← links)
- 05000293/LER-1983-013-01, /01T-0:on 830403,field Breaker for B Recirculation Pump Motor Generator Set Did Not Trip While Being Removed from Svc for Maint.Caused by bound-up Mechanism Preventing Breaker Opening.Breaker Linkages Lubricated (← links)
- 05000293/LER-1983-010-03, /03L-0:on 830222,two of Four Motor Operator Mounting Cap Screws Found Backed Out of Core Spray Valve MOV 1400-4A.Caused by Sys Vibration.Cap Screws Installed W/Thread Compound Applied.Redundant MOV 1400-4B Inspected (← links)
- 05000293/LER-1991-004, :on 910319,RCIC Sys Made Inoperable Due to Area Temp Switch Terminal Stripped During Quarterly Functional Test & Calibr.Caused by Repeating Torquing of Screws. Terminal Replaced W/Spare (← links)
- 05000293/LER-1983-011-03, /03L-0:on 830225,standby Gas Treatment Sys Filter Train B Found Inoperable Due to Soaked Charcoal.Caused by Incorrect Installation of Alison Control Solenoid Valve 191004.Charcoal Filters Replaced & Fire Watch Established (← links)
- 05000293/LER-1983-032-99, /99X-0:on 830601,organization Changes Made to Station & Corporate Structures in Tech Spec Section 6.2. Changes Intended to Provide More Direct & Effective Support of Station Operations (← links)
- 05000293/LER-1983-029-01, /01T-0:on 830617,spent Fuel Pool a HX E206-A Supports Found Incapable of Withstanding Seismic Loads. Caused by Deviation from Original Design During Initial Const.Supports Modified (← links)
- 05000293/LER-1983-033-03, /03L-0:on 830601,governor for Diesel Generator B Failed to Properly Respond to Control Signals.Caused by Malfunctioning Mechanical Governor Supplied by Woodward Governor Co.Governor Replaced W/Spare (← links)
- 05000293/LER-1983-034-03, /03L-0:on 830606,nitrogen Purge Isolation Valve AO 5033B Failed to Meet Tech Spec Required Closing Time. Caused by Use of 3/8-inch Solenoid Air Supply Valve SV 5033B.Valve Replaced w/1/2-inch Solenoid Valve (← links)
- 05000293/LER-1983-028-03, /03L-0:on 830518,diesel Generator Fuel Booster Pump Belt B Parted.Caused by Broken Belt Clip & Conditions Not Allowing Immediate Replacement of Belt B When Belt a Broken.Belt B Replaced (← links)
- 05000293/LER-1983-026-03, /03L-0:on 830515,during Insp of Control Rod Drive Piping,Number of Vent Valve Plugs Discovered Missing.No Leaks Observed.Caused by Inadequate Procedures.Missing Plugs Replaced.Procedures Modified (← links)
- 05000293/LER-1981-058-01, During Refuel Outage, Cable Spreading Room Carbon Dioxide Sys Declared Inoperative Following Abort of Special Operability Test.Caused by Design Deficiency.Halon 1301 Flooding Sys Installed (← links)
- 05000293/LER-1982-008-01, /01T-0:on 820331,while Conducting Surveillance Test 8.I.13,during Startup,Hpci Injection Valve MO-2301-8 Did Not Fully Open.Caused by Missing Jumper Wire Intended to Bypass Motor Operator Torque Switch (← links)
- 05000293/LER-1983-001-03, /03L-0:on 830105,inboard Reactor Water Sample Isolation Valve AO-220-44 Did Not Close.Cause Will Be Investigated During Next Outage (← links)
- 05000293/LER-1982-057-03, /03L-0:on 821213,during Routine Startup from Outage,Outboard MSIV AO 203-2C Did Not Close within Tech Spec Limit.Caused by Malfunctioning four-way Control Valve. Valve Replaced.Timing Dash Pot Adjusted (← links)
- 05000293/LER-1991-002, :on 910211,one Salt Svc Water Sys Pump Not Surveillance Tested Per Tech Spec.Caused by Procedural Error.Procedure Revised (← links)
- 05000293/LER-1982-054-03, /03L-0:on 821111,RPS Relay 5AK-3G Did Not Respond When D MSIV Inboard Valve Tested for 10% Closure.Caused by Failed Limit Switch.Fuse Removed.Repairs to Limit Switch Added to Next Drywell Entry Procedures (← links)
- 05000293/LER-1982-053-03, /03L-0:on 821110,ground Fault Alarm Observed on 125-volt Dc Battery Circuit & Traced to Limit Switch Circuitry for MOV2301-3.Caused by Valve Packing Steam Leakage.Packing Tightened for short-term Fix (← links)
- 05000293/LER-1982-048-03, /03L-0:on 821006,during Qad Audit,Fire Door 153 Found Closed W/Latch Mechanism Depressed W/Tape.Caused by Personnel Error.Special Meeting Conducted on 821029 Re QA Requirements & QA Significant Deficiency Rept Issued (← links)
- 05000293/LER-1983-007-03, /03L-0:on 830213,offsite Power Lost During Shutdown Condition.Caused by Opening of Inservice Breakers Resulting from Sensed Ground Fault Due to Salt Accumulation. Power Restored When Isolated Insulators Washed Down (← links)
- 05000293/LER-1983-008-03, /03L-0:on 830214,deviation from Tech Spec Fire Barrier Requirements Found During Conversion of Instrumentation & Control Lab to Ofc Space.Caused by Failure to Change Existing Conditions During Retrofit (← links)
- 05000293/LER-1983-009-03, /03L-0:on 830215,during Surveillance,Belt Driven Fuel Pump Broke on Diesel Generator A.Caused by Normal Wear.Belts Replaced (← links)
- 05000293/LER-1982-038-03, /03L-0:on 820817,while Starting Up from Cold Shutdown,Reactor Core Isolation Cooling Steam Line High Differential Pressure Alarm Received.Caused by Air in Sensing Lines to Differential Pressure Switches (← links)
- 05000293/LER-1982-032-03, /03L-0:on 820818,while Conducting Plant Startup from Cold Shutdown,Oxygen Concentration & Drywell to Torus Differential Pressure Not Established in 24-h as Required by Tech Spec.Caused by Failure of Gasket on Nitrogen Vapori (← links)
- 05000293/LER-1982-031-03, /03L-0:on 820818,reactor Water Conductivity Observed Above Tech Spec Limit.On 820820,recirculation Pump Speed & Drive Flow Relationship Mismatched.Caused by High Conductivity Due to Resin Intrusion (← links)
- 05000293/LER-1994-003, :on 940427,false Low Rector Vessel Water Level Signal Occurred While Shut Down.Caused by Deficiency in Procedure Being Used for Venting & Filling.Corrective Action Included Filling & Venting Water Header (← links)
- 05000293/LER-1983-006-03, /03L-0:on 830212,carbon Samples from One Bank of Standby Gas Treatment Sys a Train Indicated Methyl Iodine Removal Less than Tech Spec Requirement.Probably Caused by Filter Failure.Twelve Filters Replaced in Bank (← links)
- 05000293/LER-1982-052-03, /03L-0:on 821028,recirculation Pump a MG Set Inadvertently Tripped While Troubleshooting Ground Indication for 125-volt Dc Circuit.Caused by Inadequate Info Available to Troubleshooters.Info Upgraded (← links)
- 05000293/LER-1982-050-03, /03L-0:on 821026,four Fire Doors Did Not Meet NFPA & Ul Code Criteria.Caused by Personnel Improperly Affixing Warning Sign Holders.Repairs Made,Personnel Cautioned & Procedure Revised (← links)
- 05000293/LER-1982-051-03, /03L-0:on 821012,offsite Power Lost.Caused by Accumulation of Salt on Switchyard Insulators Due to Ocean Storm.Breakers Opened & Could Not Be Reclosed.Salt Washed from Insulators & Breakers Reclosed (← links)
- 05000293/LER-1982-041-03, /03L-0:on 820927,during Semiannual Surveillance of Reactor Bldg Ventilating Sys,One Damper (AO-N92) Found Inoperable.Caused by Broken Nylon Drive Gear.Other Gears on AO-N92 & AO-N90 Found Cracked.Broken/Cracked Gears Replace (← links)
- 05000293/LER-1982-044-03, /03L-0:on 820930,at 75% Power,Alarm Received for Low Nitrogen Pressure in CRD 22-51 Accumulator.After Recharging,Alarm Again Received.Caused by Leaking Accumulator.Spare,Rebuilt Accumulator Installed & Tested (← links)
- 05000293/LER-1982-042-03, /03L-0:on 820929,during Timing Surveillance,Hpci Torus Suction Valve MO-2301-35 Failed to Operate.Caused by Open Field Winding on Operating Motor.Motor Rewound,Valve Tested for Binding & Returned to Svc (← links)
- 05000293/LER-1982-043-03, /03L-0:on 820930,during Surveillance Test,Position Indication Lost for Motor Operated Valve 1301-25 RCIC Torus Suction Valve.Caused by Sticky Contacts on Motor Controller. Relay Cleaned,Valve Cycled,Test Completed & Shutdown (← links)
- 05000293/LER-1990-019, :on 901109,fire Dampers & Penetration Found Degraded in Intake Structure (← links)
- 05000293/LER-1990-016, :on 900917,automatic Actuation of Main Steam Sys/Group 1 Portion of PCIS Occurred (← links)
- 05000293/LER-1994-002, :on 940309,HPCI System Was Declared Inoperable Due to Inoperable Mov.Caused by Failure of Torque Switch. Plant Design Changes Will Be Generated to Make Torque Switch Replacement & Install New Spring Pack (← links)
- 05000293/LER-1990-015, :on 900913,unplanned Partial Isolations of Hydrogen & Oxygen Analyzer Sys & Reactor Coolant Pressure Boundary Leak Detection Sys Occurred (← links)
- 05000293/LER-1982-037-03, /03L-0:on 820823,three Monthly Functional Surveillances Performed in Slight Excess of Allowable 25% Tolerance.Caused by Personnel Oversight.Senior Level Compliance Review Implemented.Proposed Test Aids Planned (← links)
- 05000293/LER-1983-004-03, /03L-0:on 830117,reactor Pressure Sys (RPS) Breaker 5 Acb 1A Overheated Causing RPS a to Trip & Initiating Half Scram to Reactor.Caused by High Internal Resistance.Breaker Replaced (← links)
- 05000293/LER-1983-003-03, /03L-0:on 830113,during Surveillance Test,Reactor Water Cleanup Sys High Flow Isolation DPIS-1243 Found Out of Calibr.Caused by Loose Switch Plant Locking Screw Which Allowed Setpoint to Drift.Setpoint Recalibr (← links)
- 05000293/LER-1982-029-03, /03L-0:on 820805,diesel Generator B Did Not Stop When Manual Stop Actuated.Caused by Inoperable Solenoid in Hydraulic Portion of Woodward Governor.Solenoid Replaced & Unit Returned to Svc (← links)
- 05000293/LER-1982-022-03, /03L-0:on 820801,during Power Ascension Following Power Reduction,Recirculation Pump a Exceeded Speed 15% Above Speed of Recirculation Pump B.Caused by Broken Timing Belt on Recirculation Pump Scoop Tube Positioner (← links)
- 05000293/LER-1982-028-03, /03L-0:on 820804,during Recovery from Scram, MOV 220-2 Indicated Intermediate Position.Caused by Worn Limit Switch Components in Limitorque Actuator.Valve Stem Nut Found Loose from Stakes.Components Replaced (← links)
- 05000293/LER-1982-030-03, /03L-0:on 820804,torus Water Level Observed 2 Inches Above Tech Specs.Caused by Water Expansion Following Recovery from Scram.Normal Recovery Actions Returned Level to Required Limits (← links)
- 05000293/LER-1982-026-01, /01T-0:on 820817,standby Svc Water Sys/Reactor Bldg Component Cooling Water Pump Flow Discovered Insufficiently Conservative in Establishing Heat Removal Capability.Caused by Incorrect Translation of FSAR (← links)
- 05000293/LER-1982-024-01, /01T-0:on 820813,HPCI Tripped Due to High Reactor Water Level.Caused by Failure of HPCI Gland Seal Condenser Gasket Wetting HPCI Control Circuitry.Circuits Dried & Calibr.Gasket Repaired Using Improved Version of SIL-129 (← links)
- 05000293/LER-1982-025-01, /01T-0:on 820815,during IE Bulletin 80-06 Review Testing,Deuterium Analyzer Isolation Valves Found Not Wired in Accordance W/Design Basis Elementary Wiring Diagrams. Caused by Design Error in Control Panel Wiring (← links)
- 05000293/LER-1982-023-01, /01T-0:on 820813,during Personnel Access to Torus Room,Removable Hand Rail Fell Against Steam hi-flow Dpis(S) Resulting in Scram.Caused by Personnel Error. Hand Rails Removed (← links)
- 05000293/LER-1982-013-03, HPCI High Temp Switch TS2373C,contributing to Trip Logic of HPCI Turbine,Did Not Actuate.Caused by Heat Gun Reducing Output & Air Currents in Area of Switches During Test.Heat Output to Be Shielded (← links)
- 05000293/LER-1978-019-03, Inboard MSIV-AO-203-1D Declared Inoperable & Outboard MSIV-AO-203-2D Secured in Close Condition When MSIV-AO-203-1 Disc Separated from Stem. Caused by High Cycle Bending Fatigue (← links)
- 05000293/LER-1990-013, :on 900902,unplanned Manual Reactor Scram Initiated W/Reactor Power at 60%.Fuse Blew in Feedwater Control Circuit Power Supply Causing Feedwater Regulating Valves to Lockup.Trip Linkage Repaired (← links)
- 05000293/LER-1982-035-03, /03L-0:on 820830,during HPCI Surveillance Test, Gland Seal Condenser Gasket Failed.Caused by Overpressure of Gasket During Startup.Gasket Matl Changed to Rubber Bonded Asbestos.Unit Tested & Returned to Svc (← links)
- 05000293/LER-1982-027-03, /03L-0:on 820720,review of Data from Performance of Procedure 8.M.2-2.1.3 Indicated Changes to Input Data for Calibr Were Made Prior to Mgt Approval.Caused by Personnel Error.Revised Procedure Approved (← links)
- 05000293/LER-1994-001, :on 940104,HPCIS Became Inoperable & Seven Day TS 3.5.C.2 LCO Entered Due to Unplanned Isolation During Surveillance Testing.Caused by False Low Rv Pressure Signal. Calibr Unit Replaced & Hpcis Declared Operable (← links)
- 05000293/LER-1993-027, :on 931106,discovered That Action Statment of TS Table 3.2.C-1 (Rod Block) Not Taken on at Least Two Occasions Due to Change to SRM Functional Test Procedure in 1991.Procedure 8.M.2-3.3 Will Be Revised (← links)
- 05000293/LER-1982-022-01, /01X-0:on 820801,during Power Ascension Following Scheduled Power Reduction,Speed of a Recirculation Pump Went Above 15% Allowable Tech Spec Limit.Caused by Broken Timing Belt on Pump Scoop Tube Positioner (← links)
- 05000293/LER-1982-021-03, /03L-0:on 820624,fire Door 153 on 37 Ft Elevation of Turbine Bldg Annex Found Blocked Opened.Caused by Door Being Blocked to Remove Matl.Faulty Lock Replaced (← links)
- 05000293/LER-1990-014, :on 900903,automatic Closing of Primary Containment Sys Group 3 Isolation Valves Occurred While Shut Down.Caused by Transient That Actuated Stated Pressure Switches (← links)
- 05000293/LER-1993-024, :on 930930,determined MO-2301-5 Had Inadequate Thrust to Perform Designed Closing Function.Caused by Running Efficiency Used in Valve Thrust Calculation. Modified Motor Pinion Gearing (← links)
- 05000293/LER-1993-023, :on 930914,determined That Immediate or Timely Action Not Taken or Initiated for One two-by-two Control Rod Array.C/As Planned Includes Change in Setting of Pressure Switch That Controls Instrument Air Sys (← links)
- 05000293/LER-1990-012, :on 900712,discovered Two Radioactive Sources Not Leak Checked within Tech Spec Required Interval.Caused by Procedural Weakness.Sources Inventoried & Leak Checked & Procedure 6.6-010 Will Be Revised (← links)
- 05000293/LER-1993-022, :on 930910,simultaneous Loss of Preferred Offsite Power & Automatic Scram Resulting from Load Rejection Occurred.Caused by Load Rejection.Switchyard Walked Down for Evidence of Damage (← links)
- 05000293/LER-1990-011, :on 900703,automatic Actuation of RHR Sys Portion of Primary Containment Isolation Control Sys Occurred While Shut Down.Caused by Hydrodynamic Transient. Procedure Revised (← links)
- ML081300415 (← links)
- ML071420092 (redirect page) (← links)
- ML071410032 (← links)
- 05000293/LER-2007-005, Re Reactor Scram Resulting from Low Vacuum Turbine Trip (← links)
- 05000293/LER-2007-004, Target Rock Relief Valves Test Pressure Exceeded Limit Due to Corrosion Bonding and Setpoint Variance (← links)
- 05000293/LER-2007-002, Emergency Diesel Generator Kilowatt (Kw) Power Oscillations (← links)
- 05000293/LER-2007-003, Regarding Reactor Coolant Pressure Boundary Leakage Due to Reactor Vessel Nozzle Weld Crack Propagation (← links)