Pages that link to "05000263/LER-2022-001, Loss of Control Room Envelope Operability"
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The following pages link to 05000263/LER-2022-001, Loss of Control Room Envelope Operability:
Displayed 4 items.
- 10 CFR 50.73(a)(2)(ii)(B), Unanalyzed Condition (← links)
- 10 CFR 50.73(a)(2)(vii), Common Cause Inoperability (← links)
- ML22189A111 (redirect page) (← links)
- 05000263/LER-2022-001 (redirect page) (← links)
- 05000263/LER-2015-001, Operations With A Potential To Drain The Reactor Vessel (OPDRV) Without Secondary Containment Operable (← links)
- 05000263/LER-2014-009 (← links)
- 05000263/LER-2005-004 (← links)
- 05000263/LER-2001-011 (← links)
- 05000263/LER-2001-010 (← links)
- 05000263/LER-2001-009 (← links)
- 05000263/LER-2001-008 (← links)
- 05000263/LER-2001-007 (← links)
- 05000263/LER-2001-006 (← links)
- 05000263/LER-2001-005 (← links)
- 05000263/LER-2001-004 (← links)
- 05000263/LER-2001-003 (← links)
- 05000263/LER-2001-002 (← links)
- 05000263/LER-2001-001 (← links)
- 05000263/LER-1982-006, Forwards LER 82-006/03L-0 (← links)
- 05000263/LER-1982-004, Updated LER 82-004/01T-1:on 820410,inboard & Outboard 18-inch Dyrwell Vent Valves Failed to Close Upon Hand Switch Activation.Probably Caused by Solenoids Being Mounted Horizontally & Residual Core Magnetism.Solenoids Replaced (← links)
- 05000263/LER-1982-008, Forwards LER 82-008/03L-0 (← links)
- 05000263/LER-1982-007, Forwards LER 82-007/03L-0 (← links)
- 05000263/LER-1982-013, Updated LER 82-013/01T-3:on 820928,1020,31 & 1102,during Preparation for Repair of E,C & F safe-ends,thru Wall Leaks Found on Each safe-end.Caused by Intergranular Stress Corrosion Cracking.Defects Repaired (← links)
- 05000263/LER-1982-016, Forwards LER 82-016/01T-0 (← links)
- 05000263/LER-1978-030, Forwards Revised LER 78-030/01X-1 to Correct Typographical Error in Valve Identification Number (← links)
- 05000263/LER-1995-007, Forwards LER 95-007-00 Re mis-positioning of Div B Drywell Spray Block Valve.Rept Contains New NRC Commitment (← links)
- 05000263/LER-1996-003, Forwards LER 96-003-00 Re re-analysis of High Energy Line Break,Error Found in Existing Analysis.Rept Contains Submitted New NRC Commitments (← links)
- 05000263/LER-1983-005, Forwards LER 83-005/03L-0 (← links)
- 05000263/LER-1979-022, Forwards LER 79-022/03L-0 (← links)
- 05000263/LER-1998-004, Forwards LER 98-004-00 Re Manual Scram Inserted Following Pressure Transient Closes Air Ejector Suction Isolation Valves & Trips Offgas Recombiners.Ler Contains Listed Commitment (← links)
- 05000263/LER-1998-005, Forwards LER 98-005-00,re HPCI Being Removed from Service to Repair Steam Leak in Drain Trap Bypass.Commitments Made by Util Are Listed (← links)
- 05000263/LER-1997-014, Forwards LER 97-014-00 Re Div II ADS Inhibit Switch Which Was Not Tested as Required by Ts.Commitment,Listed (← links)
- 05000263/LER-1997-013, Forwards LER 97-013-00,re Insertion of Manual Scram Due to Loss of Condenser Vacuum.Caused by Electrical Fault Tripping Recombiners.New Commitments Listed (← links)
- 05000263/LER-1983-006, Forwards LER 83-006/01T-0 (← links)
- 05000263/LER-1981-017, Forwards Updated LER 81-017/03L-1 (← links)
- 05000263/LER-1997-012, Forwards LER 97-012-00 Re CST Low Level Suction Transfer Setpoint Which Did Not Provide Sufficient Submergence as Result of Design Deficiency.Commitments Made within Ltr, Submitted (← links)
- 05000263/LER-1997-010, Forwards LER 97-010-00 Re Failure to Include Some Supports on Reactor Head Vent Line in ISI Program in 2nd 10-Yr Interval.Rept Contains Two New NRC Commitments (← links)
- 05000263/LER-1998-003, Forwards LER 98-003-00 Re Transgranular Stress Corrosion Cracking Identified in Control Rod Drive Lines.Rept Contains Listed New NRC Commitments (← links)
- 05000263/LER-1998-001, Forwards LER 98-001-00 Re Containment Isolation Valve Leakage Which Exceeded Ts.Commitment Made by Util,Listed (← links)
- IR 05000263/2023002 (← links)
- 05000263/LER-1993-010, Forwards LER 93-010-00 Re Main Control Room Emergency Filtration Train Outside Design Basis Caused by in-leakage Across Inlet Dampers.Lessons Learned from Event Will Be Presented in Engineering Technical Staff Training (← links)
- 05000263/LER-1980-025, Forwards Updated LER 80-025/03L-1 (← links)
- 05000263/LER-2024-002, Low Pressure Coolant Injection Inoperable Due to Motor Valve Failure (← links)
- 05000263/LER-2024-001, Reactor Scram, Containment Isolation, and Cooldown Rate Outside of Limits Following Technician Adjustment of Wrong Component (← links)
- 05000263/LER-2023-003, Condition Prohibited by Technical Specifications Due to Inoperable Main Steam Line Low Pressure Isolation Switch (← links)
- 05000263/LER-2023-002, Reactor Scram and Containment Isolation Due to Valve Responses During Main Turbine Control Valve Testing (← links)
- 05000263/LER-2023-001, Main Steam Isolation Valve Leakage Exceeds Technical Specification Requirements Due to Stem Scoring (← links)
- 05000263/LER-2022-001, Loss of Control Room Envelope Operability (← links)
- 05000263/LER-1998-002-02, :on 980415,main Steam Isolation Valve Position Setpoint Outside Allowed Range,Was Found.Caused by Previous Testing Technique & Use of Particular Switch Model.Eight New Position Switches W/Less Deadband Installed (← links)
- 05000263/LER-1998-003-01, :on 980417,transgranular Stress Corrosion Cracking Was Identified in Control Rod Drive Lines.Caused by chloride-induced Transgranular stress-corrosion Cracking. Affected Sections of Two Lines Replaced (← links)
- 05000263/LER-1998-001-02, :on 980323,discovered Containment Isolation Valve Leakage Exceeded TS Limit.Caused by Foreign Matl Found on Valve Seat.Repaired Subject Valves & Developed Process to Ensure Cleanliness of Testing Equipment (← links)
- 05000263/LER-1986-024, :on 861003,reactor Scram Occurred During Venting of Condensate Pump 11.Caused by Lack of Procedures & Two Pumps Sharing Common Vent Line.Procedure Prepared. Individual Vent Lines Will Be Installed (← links)
- 05000263/LER-1986-026, :on 861014,portions of Group II Primary Containment Isolation Sys & Standby Gas Treatment Sys Started W/O Valid Initiation Signal.Caused by Blown Fuse. Fuse Replaced (← links)
- 05000263/LER-1986-025, :on 861014,during Performance of Scram Discharge Vol Level Instrument Surveillace Test,Reactor Scrammed.Caused by Personnel Error.Improved Lighting Will Be Provided in Work Area (← links)
- 05000263/LER-1986-029, :on 861225,reactor Bldg Ventilation Isolation & Standby Gas Treatment Sys Initiation Occurred During Routine Power Operation.Caused by Spurious hi-hi Trip.Monitor & Reactor Bldg Ventilation Isolation Reset (← links)
- 05000263/LER-1986-028, :on 861219 & 870109,emergency Filtration Train Sys Transferred to Toxic Chemical Mode.Caused by Defective Lamp Holder,Leading to Chlorine Monitor Optics Light Source Failure.Lamp Holder Replaced (← links)
- 05000263/LER-1997-011, :on 970908,failure to Transfer HPCI & RCIC Suctions to Suppression Pool After Making Condensate Storage Tank Level Instrument Inoperable Occurred.Caused by Cognitive Personnel Errors.Procedures Reviewed (← links)
- 05000263/LER-1997-010-01, :on 970916,failure to Include Some Supports on Reactor Head Vent Line in ISI Program in 2nd 10 Year Interval Occurred.Caused by Original Plant Drawings Incomplete.Controlled Drawings Will Be Revised (← links)
- 05000263/LER-1986-021, :on 860620,during Refueling Operations,Reactor Bldg Ventilation Isolations & Standby Gas Treatment Sys Initiations Occurred.Caused by Loss of Sample Flow from Channel a Vent as Result of Failed Flow Sensor (← links)
- 05000263/LER-1986-018, :on 860616,during Refueling,Voltage Transient Experienced,Causing Protective Fuses in All intermediate- Range Monitors on Reactor Protection Sys B to Blow.Caused by Design Flaw.Mods Under Investigation (← links)
- 05000263/LER-1986-019, :on 860617,during Surveillance Testing,Noise Spike on intermediate-range Monitor 16 Tripped Channel a, Resulting in Initiation of Reactor Protection Sys.Caused by Inadvertent Manipulation of Detector Cables (← links)
- 05000263/LER-1986-022, :on 860623,reactor Protection MG Set 11 Tripped Causing Reactor Bldg Isolation,Group II Primary Containment Isolation & Initiation of Standby Gas Treatment Sys.Caused by Personnel Error.Operator Counseled (← links)
- 05000263/LER-1987-004, :on 870119,plant Painters Working in Reactor Feedwater Pump Area Tripped Reactor Feedwater Pump 11.Caused by Painters Wiping Paint Off Loose Gauge Glass.Loose Gauge Glass Replaced.Setpoint Verified (← links)
- 05000263/LER-1986-014, :on 860515,reactor Protection Sys Trip Occurred.Caused by Noise Spike on Intermediate power- Range Monitor 14 Tripping Channel a of Reactor Protection Sys.Channel a Trip Reset (← links)
- 05000263/LER-1986-012, :on 860508 Five Penetrations of Transversing in-core Probe Sys Omitted from double-gasket Seal Testing Procedure.Procedure Revised.Penetrations Tested & Drawings Reviewed (← links)
- 05000263/LER-1986-011, :on 860509,EFT Sys (Control Room HVAC) Automatically Transferred to Toxic Chemical Mode Due to Hydrogen Chloride Monitor Tape Break.Caused by Small Imperfection on Tape (← links)
- 05000263/LER-1986-010, :on 860508,reactor Bldg Ventilation Isolation & Standby Gas Treatment Sys Initiation Occurred.Caused by Reactor Bldg Vent wide-range Gas Monitor Trip Due to Hardware/Software Problems (← links)
- 05000263/LER-1987-003, :on 870112,fire Door Blocked Open & Unattended for 8 H or More During Routine Maint Activities.Caused by Inadequate Training of Personnel.Water Hose Removed & Fire Door Closed.Addl Fire Door Training Initiated (← links)
- 05000263/LER-1986-007, :on 860224,EFT Sys (Control Room HVAC) Transferred to Toxic Chemical Emergency Mode Due to Chlorine Monitor Tape Break,Resulting in Monitor Trip.Caused by Worn Pinch Roller.Roller Replaced & Head Cleaned (← links)
- 05000263/LER-1987-002, :on 870108,trip of RHR Shutdown Cooling Supply High Pressure Interlock Occurred.Caused by Pressure Transient Which Tripped Interlock Pressure Switches.Return Lines & Shutdown Cooling Supply Flushed (← links)
- 05000263/LER-1985-017, :on 851007,spurious Trip of Chlorine Monitor Occurred.Caused by Cassette Running Out of Tape Due to Insufficient Length Supplied by Mfg.On 851031,tape Broke Due to Defect.Mfg Notified (← links)
- 05000263/LER-1999-007, :on 990610,HPCI Test Return Valve Was Unable to Close Against Max Expected Differential Pressure.Caused by Failure to Accurately Predict Valve Performance.Procedure Revised.With (← links)
- 05000263/LER-1999-006-01, :on 990602,during Quarterly Surveillance Hcpi Was Declared Inoperable.Caused by Drain Pot Alarm.Revised HPCI Surveillance Test Procedure.With (← links)
- 05000263/LER-1987-005, :on 870211,reactor Bldg Ventilation Isolation & Standby Gas Treatment Sys Initiation Occurred.Caused by Electronic Noise Spike.Monitor & Reactor Bldg Ventilation Isolation Reset (← links)
- 05000263/LER-1987-001, :on 870108,reactor Pressure Sys Actuation, Primary Containment Groups II & III Isolation & Standby Gas Treatment Sys Initiation Occurred Due to Reactor Low Water Level.Caused by Operator Error.Esf Sys Reset (← links)
- 05000263/LER-1986-020, :on 860619,reactor Protection Sys (RPS) & Group II Tripped from Loss of Power.Caused by RPS-B Power Supply Being Fed from Alternate Power Source as Same Load Ctr Source as RPS-A (← links)
- 05000263/LER-1999-004-01, :on 990422,low Reactor Water Level Scram,Group 2 & 3 Isolations & Subsequent HPCI Became Inoperable.Caused by Feedwater Controller Power Supply Failure.Three Power Supplies Replaced & Connections Cleaned.With (← links)
- 05000263/LER-1986-027, :on 861129 & 1209,emergency Filtration Train Transferred to Toxic Chemical Emergency Mode as Result of Spurious Trip of Chlorine Monitor.Caused by Abnormal Substance on Detector Tape.Trip Logic Revised (← links)
- 05000263/LER-1986-017, :on 860615,ECCS Initiated During Reactor Water Level Instrumentation Mod.Caused by Administrative & Procedural Control Inadequacies.Controls Will Be Improved & Administrative Requirements Will Be Changed (← links)
- 05000263/LER-1986-015, :on 860603,RHR Pump 11 Tripped While in Svc in Shutdown Cooling Mode.Caused by Closure of Shutdown Cooling Supply Outboard Isolation Valve MO-2030.Procedure Revised (← links)
- 05000263/LER-1999-002-01, :on 990329,event Sequence That Results in Available ECCS Being Reduced to Less than That Assumed in Current Safety Analysis.Caused by Failure of Edg.Plant Operating Procedures Revised.With (← links)
- 05000263/LER-1999-003-01, :on 990412,HPCI & Division 1 ECCS Equipment Were Declared Inoperable Due to Svc Water Pump Failure.Pump Shaft Was Mechanically Freed,Check Valve Was Repaired & Pump Was Successfully Tested.With (← links)
- 05000263/LER-1986-013, :on 860513,standby Gas Treatment Sys Initiation Occurred During Cavity Draindown.Caused by Upscale Trip of Fuel Pool Radiation Monitor.Trip Setpoint Adjusted to Tech Spec Limits & Precautions Added to procedure.W/860612 1tr (← links)
- 05000263/LER-1987-008, :on 870307,ESF Actuated.Caused by Personnel Error Re Use of Jumper During Reactor Bldg wide-range Gas Monitor Source Check Surveillance Test.Procedures Will Be Modified to Eliminate Use of Jumper (← links)
- 05000263/LER-1987-007, :on 870227,Group IV Isolation Occurred During HPCI Testing.Caused by Design Deficiency in Flow Control Sys & Inadequate Surveillance Test Procedure.Hpci Operations Manual & Operabilty Test Procedure Revised (← links)
- 05000263/LER-1983-006-01, /01T-0:on 830408,HPCI Woodward Governor Egr Hydraulic Actuator Coil Tailed.Caused by Lead Wire Insulation Degradation Allowing Ground Fault to Egr Housing. Egr Replaced.Hpci Satisfactorily Tested (← links)
- 05000263/LER-1999-001-02, :on 990215,HPCI High Steam Flow Isolation During Quarterly Surveillance Test Was Noted.Caused by Inadequate Surveillance Procedure.Revised Surveillance Procedure.With (← links)
- 05000263/LER-1987-006, :on 870216,reactor Scram Occurred.Caused by Two Electrical Disturbances Propagating Through Div 1 Sys Due to Failure of Output Feedback Control Transformer.Power Supplies & Instrumentation Examined (← links)
- 05000263/LER-1986-009, :on 860401,EFT Sys Transferred to Pressurization Mode.Caused by Spurious Trip of Radiation Monitor.Monitor Reset & EFT Sys Returned to Normal (← links)
- 05000263/LER-1986-023, :on 860628,LPCI Loop Selection Logic Failed to Choose Correct Loop for Injection.Caused by Design Deficiency.Instantaneous Contacts in Loop Selection Logic Relays Replaced w/0.5 Time Delay Contacts (← links)
- 05000263/LER-1986-008, :on 860307,isolations of Reactor Bldg Ventilation Sys & Initiations of Standby Gas Treatment Sys Occurred.Caused by Spurious hi-hi Trip from Channel B Gas Monitor.Test Switches Will Be Installed (← links)
- 05000263/LER-1986-016, :on 860611,both Squib Valve Detonators Shorted After Firing & Control Power Transformer Fuse Blew,Causing Pump Motor Trip.Caused by Improper Fuse Coordination.Fuse Coordination Corrected (← links)
- 05000263/LER-1997-014-01, :on 971219,determined That Division II ADS Inhibit Switch Was Not Tested as Required by Ts.Caused by Cognitive Error by Revision Preparer & Reviewer of Surveillance Test.Temporary Change in Surveillance Test (← links)
- 05000263/LER-1997-013-01, :on 971125,manual Scram Was Inserted Due to Loss of Condenser Vacuum.Caused by Electrical Fault Tripping.Temporary Cables Were Installed Primarily Above Ground (← links)
- 05000263/LER-1997-006, :on 970408,emergency DG Started While Electrical Maintenance Personnel Were Performing Monthly Degraded Safeguards Bus Voltage Surveillance.Caused by Personnel Error.Lessons Learned Meeting,Held (← links)
- 05000263/LER-1999-005, :on 990508,personnel Inserted Manual Scram When Pressure Transient Closed Air Ejector Suction Isolation Valves & Tripped off-gas Sys.Caused by Recombiner Catalyst Migration.Catalyst Was Removed.With (← links)
- 05000263/LER-1998-005-01, :on 980921,HPCI Was Removed from Service to Repair Steam Leak in Drain Trap by Pass.Caused by Localized Erosion of Valve Body.Valve Was Declared Inoperable & Was Replaced with Manual Valve (← links)
- 05000263/LER-1998-004-02, :on 980909,manual Scram Was Inserted Following Pressure Transient Closed Air Ejector Suction Isolation Valves & Trips Offgas Recombiners,Occurred.Caused by Seat Leakage.Leaking Valve Seat Was Reworked (← links)
- 05000263/LER-1986-002, :on 860107,during HPCI Sys Monthly Surveillance Test,Hpci Pump Flow Controller Would Not Respond in Auto Mode.Caused by Switch Contacts Prohibiting Reading of Setpoint.Switch Mechanisms Cleaned (← links)
- 05000263/LER-1985-020, :on 851123,26,1203 & 1213,EFT Sys (Control Room HVAC) Transferred to Emergency Mode on Spurious Trips of Ammonia Monitor.Latter Three Events Due to Chlorine Monitor Cassette Running Out of Tape.Tape Replaced (← links)
- 05000263/LER-1997-009-01, :on 970701,partial Primary Containment Isolation Occurred.Caused by Voltage Transient During Severe Weather.Restored Sys to Conditions That Existed Prior to Event & Repaired Damaged 345 Kv Line (← links)
- 05000263/LER-1997-005, :on 970408,failure to Analyze Diesel Fuel Samples within TS Required Surveillance Interval Was Discovered Due to Lack of Technical Staff Understanding. Diesel Fuel Surveillance Procedure Was Changed (← links)
- 05000263/LER-1987-023, :on 871125,crack in Pipe (Mfg by Sandvik,Inc) in Decontamination Connection on Reactor Recirculation Sys Loop a Found.Caused by High Cycle Fatigue.Decontamination Connection Modified (← links)
- 05000263/LER-1986-006, :on 860212,Group II Primary Containment Isolation Sys,Including Standby Gas Treatment Sys a Initiated W/O Valid Plant Trip Signal.Caused by Failure of Relay Coil.Coil Replaced & Tested (← links)
- 05000263/LER-1986-005, :on 860209,isolation of Reactor Bldg Ventilation Sys & Initiation of Standby Gas Treatment Sys Occurred Due to Reactor Bldg Vent wide-range Gas Monitor Trips.Caused by Personnel Error.Manual Revised (← links)
- 05000263/LER-1986-003, :on 860123,Group II Isolation Standby Gas Treatment Initiation & Secondary Containment Isolation Occurred.Caused by Accidental Grounding Due to Insufficient Procedural Guidance for Internal Wiring (← links)
- 05000263/LER-1986-004, :on 860127,spurious Trip of Chlorine Monitor Occurred When EFT Sys (Control Room HVAC) Transferred to Emergency Mode.Caused by Break in Chlorine Monitor Tape. Monitors & Trip Logic Upgrading Underway (← links)
- 05000263/LER-1992-010, :on 920725,discovered That Four Valves Used to Mitigate Consequences of HELB Not Included in ASME Section XI Testing Program.Caused by Failure to Include Emergency Svc Water Valves in Aop.Aops Revised (← links)
- 05000263/LER-1997-008, :on 970418,inappropriate Use of 25% Tolerance for Periodic Actions in Section 3 of TS Was Noted.Caused by Error of Personnel Preparing & Revising TS Interpretation. TS Interpretation Deleted on 970404 (← links)
- 05000263/LER-1997-007, :on 970415,discovered Net Positive Suction Head Available for Core Spray Pumps Less than Required.Caused by Identification of Increased ECCS Strainer Head Loss.Plant Brought to Cold Shutdown (← links)
- 05000263/LER-1985-018, :on 851015,reactor Bldg Ventilation Isolation & Standby Gas Treatment Sys Initiation Occurred.Caused by Upscale Trip from Monitor When Trip Check Push Button Released.Upscale Trip Reset (← links)
- 05000263/LER-1997-004, :on 970220,failure to Submit Relief Requests for Limited ISI Exams Discovered.Caused by Missed Interpretation of Sections.Required Relief Requests Will Be Submitted for Limited Exams Performed in Future (← links)
- 05000263/LER-1985-021, :on 851218,25 & 28,EFT Sys Transferred to Emergency Mode.Caused by Spurious Trip of Ammonia Monitor & Chlorine Monitor Tape Break.License Amend Requested to Remove Ammonia Monitor (← links)
- 05000263/LER-1985-019, :on 851011,determined That Aug Diesel Fuel Oil Sample Not Analyzed for Quality.Caused by Procedural Deficiency.Procedure Revised to Provide Control of Quality Analysis Process (← links)
- 05000263/LER-1997-003, :on 970128,piping Between Double Containment Isolation Valves Could Be Stressed Greater than Code Allowables During Certain Accident Conditions.Caused by Design Deficiency (← links)
- 05000263/LER-1984-025, :on 840715,while Isolating Bus 16 for Relay Maint,Emergency Diesel Generator 11 Started When Operator Opened Bus Potential Transformer Door on Rear of Cubicle 152-610 Rather than 152-601 (← links)
- 05000263/LER-1984-027, :on 840912,while Pulling Wires Into Substation Panel,Large Cable Jarred Adjacent Panel & Tripped 345 Kv Bus Differential Relays,Deenergizing Source for Auxiliary Reserve Transformer,Resulting in Autostart (← links)
- 05000263/LER-1985-015, :on 850805,turbine Bldg Fire Protection Header Not Flushed Per Tech Spec 4.13.B.1.h.Caused by Inadequate Surveillance Procedure for Detecting Changes to Tech Specs. Procedure Revised (← links)
- 05000263/LER-1996-010-01, :on 961016,panel Fire Barriers Were Not in Correct Position.Cause Unknown.Barrier Restored to Proper Position & Other Barriers in C04 & C08 in CR Checked.W/ (← links)
- 05000263/LER-1985-013, :on 850729,recirculation Pump Trip Occurred While Replacing Brushes on Recirculation motor-generator Exciter 12.Caused by Abrupt Loss of Field Due to Removal of Arcing Brush.Brush Holder Repaired (← links)
- 05000263/LER-1997-002, :on 970116,no Licensed Senior Operator Was in Control Room/Shift Supervisors Ofc.Caused Because Shift Manager Failed to Follow Plant Procedure.Electronic Message Was Sent to All Shift Managers (← links)
- 05000263/LER-1984-005-01, :on 840112,EFT Sys Automatically Transferred to Toxic Chemical Emergency Mode Due to Trip of Hydrogen Chloride Monitor.Caused by Operator Opening Detector Head. Procedures Will Be Revised (← links)
- 05000263/LER-1984-012, :on 840313,spurious Trip of Monitor Occurred When EFT Sys Transferred to Toxic Chemical Emergency Mode. Caused by Lack of Tape.Manufacturer Will Provide Tape (← links)
- 05000263/LER-1984-021, :on 840604,advertent Trip of Offsite Source Supply to Plant Caused Fast Start of Diesel Generator & Initiation of Standby Gas Treatment Sys.Caused by Personnel Error.Procedures Will Be Revised (← links)
- 05000263/LER-1984-001-02, :on 840101,undervoltage Relays Tripped Resulting in Load Shedding.Caused by Procedural Deficiency. Procedure CM 4520 Will Be Revised (← links)
- 05000263/LER-1996-014-01, :on 961216,unqualified Electrical Splice Found in Train B Standby Gas Treatment Sys.Cause Appears to Be Associated with Original Plant Construction.Unqualified Splice Was Removed (← links)
- 05000263/LER-1996-013-01, :on 961212,surveillance Procedure for CR Emergency Filtration Sys Found Not to Comply W/Ts Surveillance Requirement.Caused by Original Surveillance Failed to Require Testing of Adjacent Areas.Cr Reviewed (← links)
- 05000263/LER-1985-011, :on 850624,EFT Sys Transferred to Toxic Chemical Emergency Mode as Result of Failed Sample Pump in Hydrogen Sulfide Monitor & Failed Optics Lamp in Chlorine Monitor.Sample Pump & Lamp Replaced (← links)
- 05000263/LER-1996-011-01, :on 961112,jumper Placement Error Occurred During Surveillance Procedure,Causing Dual Recirculation Pump Trip Requiring Manual Scram.Caused by Inadequate Labeling.Surveillance Procedure Revised (← links)
- 05000263/LER-1985-012, :on 850603,reactor Bldg Ventilation Isolation & Initiation of Standby Gas Treatment Sys Occurred.Caused by Personnel Error While Performing Maint Procedure on Channel a Reactor Bldg Vent wide-range Gas Monitor (← links)
- 05000263/LER-1996-009-01, :on 960924,failure to Perform Required Actions within One Hour Following Discovery of Water in Fire Hydrant Barrel Noted.Water Was Pumped Out & Drain Port Was Repaired Under Work Orders 9602567 & 9602627 (← links)
- 05000263/LER-1985-010-01, :on 850612,reactor Scram Occurred During Main Steam Line Low Pressure Surveillance Test.Caused by Personnel Error.Incident Discussed W/Technician.Operator Availability Testing Improved (← links)
- 05000263/LER-1985-009, :on 850417,reactor Bldg Ventilation Isolation & Standby Gas Treatment Sys Initiation Occurred.Caused by Spurious Trip of Ga Co Channel a Reactor Bldg Vent wide-range Gas Monitor (← links)
- 05000263/LER-1992-015, :on 921021,determined That CR Ventilation & Emergency Filtration Train Radiation Detectors Outside Design Basis.Caused by Design Deficiency During Initial CR Design.Mod to Initiate Transfer Installed (← links)
- 05000263/LER-1992-012, :on 920824,six RHR Svc Water Valves,Two ESW Valves & Two EDG Emergency Svc Water Valves,Noted During NRC Insp,Not Included in ASME Section XI Program.Caused by Code Misinterpretation.All Components Will Be Tested (← links)
- 05000263/LER-1992-012-01, Forwards LER 92-012-01 Initially Re Failure to Include Manual Valves in Section XI Testing.Results of Review & Other ASME Section XI Program Discrepancies,Noted in Insp Rept 50-263/92-10 Warranted Rev to LER (← links)
- 05000263/LER-1992-017, :on 921109,non-safety Related Relays Could Prevent Both EDG from Performing Intended Function Due to Inadequate Design.Safety Evaluation Performed to Assess Operation of EDG W/Power Monitoring Relay (← links)
- 05000263/LER-1985-008, :on 850411,turbine Control Sys Initiated Scram When Phase Fault Occurred.Caused by Personnel Neglecting to Remove Grounding Cables After Completion of Maint Activity. Substation Relaying Will Be Modified (← links)
- 05000263/LER-1977-010, :on 770616,Torque Switch Adjustments on Mo of Outboard RCIC Steam Line Isolation Valve Not Made W/Required Process Due to Improper Instruction.Switch Later Properly Adjusted (← links)
- 05000263/LER-1977-012, :on 770620,GE Observed That Pump Trip Delay Time Assumed in Original Cycle 5 Transient Analysis Inappropriate.License Amend Request Will Be Submitted to Increase MCPR Transient Limits (← links)
- 05000263/LER-1977-016, :on 770709,determined That a Recombiner Sys Could Be Opened Due to Dirt in Valve Seat Disc.Recombiner Sys & Solenoid Valve Internals Replaced (← links)
- 05000263/LER-1977-009, :on 770531,main & Limit Switch Gear Train Grease Had Deteriorated Due to High Ambient Temp.Gear Train Cleaned & Repacked & Lower Temp Presently Maintained Due to Recent Ventilation Mod (← links)
- 05000263/LER-1983-025-03, /03L-0:on 831202,RHR Svc Water Sys Pump Declared Inoperable Due to Failure of Check Valve to Seat Properly. Caused by Excessive Disk Stud Thread Wear.Weld Matl Added to Stud & New Threads Machined for Nut (← links)
- 05000263/LER-1983-011-03, /03L-0:on 830519,discovered Steam Leak on Reducer at Moisture Separator Drain D Valve CV-3134 to Heater 14B. Caused by Erosion of Carbon Steel Reducers by Steam at 380 F & 195 Psi.Stainless Steel Reducers Installed (← links)
- 05000263/LER-1983-024-03, /03L-0:on 831027,low Level Scram Switch Discovered Below Deviation Limit.Caused by Setpoint Drift.Switch Replaced & Surveillance Schedule Accelerated.Redundant Switches Tested Satisfactorily (← links)
- 05000263/LER-1983-012, /O3L-0:on 830519,mode Switch Scram Bypass Annunciator Came on Following Energization of Reactor Protection Logic.Caused by Relay Race.Relays Manually Actuated to Return to Normal Condition (← links)
- 05000263/LER-1983-014-01, /01T-0:on 830601,HPCI Isolated on High Steam Flow. Caused by Leakage of Inboard Injection Gate Valve,Causing Void in HPCI Injection Line.Procedure Changed to Operate W/Outboard Injection Valve Closed (← links)
- 05000263/LER-1983-019-01, /01T-0: on 830801,air Operated Reactor Bldg to Torus Vacuum Breaker AO-2380 Found Leaking in Excess of Tech Specs.Cause Unknown.Valve Placed on Accelerated Surveillance Program (← links)
- 05000263/LER-1983-013-03, /03L-0:on 830519,inboard MSIV AO-2-80D Closed Faster than Value Stated in Tech Spec Table 3.7.1.Caused by Leakage of Oil from Control Valve Housing to Body Threaded Connection.Housing Tightened (← links)
- 05000263/LER-1992-018, :on 921113,determined That APRM Scram Setpoint Set So Scram Could Occur Outside Analyzed Conditions.Caused by Failure to Implement Updated SAR Requirements.Gain Setting Adjusted (← links)
- 05000263/LER-1992-016, :on 921107,two Check Valves in Esws Failed to Seat Properly.Cause Unknown.Check Valves Will Be Inspected, Replaced or Repaired & Supplemental Rept W/Results Will Be Submitted (← links)
- 05000263/LER-1992-008, :on 920624,1-inch Conduit Fire Barrier Declared Inoperable & on 920831,4-inch Conduit Fire Barrier Declared Inoperable Based on Review of NRC Bulletin 92-001 & Suppl 1. Continuous Fire Watch Established (← links)
- 05000263/LER-1996-008, :on 960816,reactor Water Clean Line Break Reanalysis Noted Due to Error Discovered During Reevaluation.Rwcu Sys Was Taken OOS & Isolated as Conservative Action for Short Period of Time (← links)
- 05000263/LER-1996-003-01, :on 960404,personnel Identified Error in Current Licensing Basis Analysis.Caused by Improper Analyzed Ambient Temps in Vicinity.Mods Will Be Installed During Current Outage (← links)
- 05000263/LER-1992-010-01, Forwards LER 92-010-01,modifying Root Cause of First Event, Based on Investigation Delineated in LER 92-012-00 (← links)
- 05000263/LER-1985-007-01, :on 850308,Channel B Reactor Bldg Vent wide- Range Gas Monitor Isolated Reactor Bldg Ventilation & Started Standby Gas Treatment Sys.Caused by Valve VGM-35-2 Inadvertently Left Closed During Test 0389 (← links)
- 05000263/LER-1992-014-01, :on 921003,automatic Transfer of High Pressure Coolant Injection Suction from Condensate Storage Tanks to Suppression Pool Occurred Due to Inadvertent Jarring of Level Switch.Hpci & RCIC Returned to Normal (← links)
- 05000263/LER-1992-013-02, :on 920930,identified That Fire Barrier Damper Had Not Been Inspected as Required by Ts.Caused by Failure to Include Damper in Surveillance Program.Fire Watch Established & Damper Inspected (← links)
- 05000263/LER-1996-007-01, :on 960615,reactor Scram Resulted from Electrical Short in Generator Condition Monitor.Corrected Wiring Error (← links)
- 05000263/LER-1992-011-01, :on 920922,determined That Existing Elevator Could Have Damaged Safe Shutdown Equipment During Design Bases Seismic Event.Caused by Inadequate Original Design.New Elevator Will Be Installed (← links)
- 05000263/LER-1985-006-01, :on 850313,EFT Sys (Control Room HVAC) Transferred to Emergency Mode.Caused by Broken Hydrogen Chloride Monitor Tape.Tape Advanced Past Defective Area.W/ (← links)
- 05000263/LER-1996-006-01, :on 960609,reactor Scram Occurred.Caused by Loss of Stator Water Cooling Flow.Rebuilt Pumps,Replaced Oilers W/Different Type of Device & Installed Grounding Strap/Brush on Both Stator Water Cooling Pumps (← links)
- 05000263/LER-1996-005-01, :on 960530,unplanned Partial Containment Isolation Occurred.Caused by False High Radiation Signal. Reset Containment Isolation & Repaired Reactor Bldg Exhaust Plenum Radiation Monitor (← links)
- 05000263/LER-1992-009, :on 920728,HPCI Declared Inoperable Due to Concerns That Sys Would Not Perform as Described in FSAR During Atws.Caused by Inadequate Consendate Storage Tank Inventory.Updated FSAR Will Be Revised (← links)
- 05000263/LER-1984-032, :on 841227,reactor Scram Occurred Due to Noise Spike on Intermediate Range Monitor Channel 13 Which Tripped Channel a of Reactor Protection Sys.Noise Spike Caused by Const Activity in Drywell (← links)
- 05000263/LER-1984-034, :on 841207,RHR Pump 11 Tripped While in Svc in Shutdown Cooling.Caused by Closure of Shutdown Cooling Supply Line Isolation Valves MO-2029 & MO-2030 Due to Loss of Suction Interlock (← links)
- 05000263/LER-1996-004-01, :on 960414,inboard Main Steam Isolation Valve Leakage Greater than Allowed by Tech Specs.Caused by Tipping of Poppet.Valve Poppets & Stems Replaced W/New Design to Reduce Poppet Tipping (← links)
- 05000263/LER-1985-005-01, :on 850210,EFT Sys (Control Room Hvac,Sys Code VI) Automatically Transferred to Toxic Chemical Emergency Mode as Result of Failure of Tape Drive Mechanism of Chlorine Monitor at 9046B.Caused by Jamming (← links)
- 05000263/LER-1985-003-01, :on 850129,EFT Sys (Control Room HVAC) Transferred to Toxic Chemical Emergency Mode.Caused by Spurious Trip of Hydrogen Chloride Monitor AT-9036.Monitor Reset & Sys Returned to Normal Operation (← links)
- 05000263/LER-1985-004-01, :on 850201,during Quarterly Valve Exercising, Flow Established Through RHR Intertia Line While Reactor in Run Mode.Caused by Improper Procedure.Procedure Revised (← links)
- 05000263/LER-1985-002-01, :on 850113,half Scram,Group II Isolation,Eft & Standby Gas Treatment Sys Initiations & Load Shed Occurred. Caused by Transfer of 4 Kv Bus to Auxiliary Reserve Transformer.Bus Returned to Normal Source (← links)
- 05000263/LER-1996-002-01, On:960308,found Wire in 12 EDG Voltage Regulator Not Properly Secured Due to Missing Fastener. Cause for Missing Fastener Not Known.Wire Lug Secured & Both EDGs Tested (← links)
- 05000263/LER-1992-013-01, :on 920930,identified That Fire Barrier Damper Had Not Been Inspected as Required by Ts.Caused by Failure to Perform Surveillance.Surveillance Procedure Revised to Include Damper for Insp Every 18 Months (← links)
- 05000263/LER-1984-028, :on 840914,reactor Protection Sys B Motor Generator Set Overload/Overtemp Relay open-circuited.Cause Unknown.Power Restored & Relays a & B Replaced (← links)
- 05000263/LER-1992-014, :on 921003,automatic Transfer of HPCI Suction from Condensate Storage Tanks to Suppression Pool Occurred. Caused by Inadvertent Jarring of Level Switch.Hpci & Core Isolation Cooling Sys Returned to Normal (← links)
- 05000263/LER-1984-033, :on 841127,turbine Auxiliary Oil Pump Motor Failed.Caused by Annunciation of Turbine Auxiliary Oil Pump Breaker & Transfer of Instrument Ac Bus.Motor Repaired (← links)
- 05000263/LER-1984-031, :on 841016,EFT Sys (Control Room HVAC) Transferred to Emergency Mode as Result of Spurious Trip of Chlorine Monitor AT-9046A.No Apparent Cause Found.Monitor Reset (← links)
- 05000263/LER-1984-030, :on 841009,EFT Sys Transferred to Emergency Mode When Ammonia & Hydrogen Chloride Monitor Tape Cassettes Ran Out,Resulting in Spurious Trip of Monitors. Replacement Schedule Revised (← links)
- 05000263/LER-1995-007-01, :on 951012,valve RHR 74-2 Found Closed & Unlocked.Caused by Personnel Errors.Event Discussed W/Shift Personnel & Formal Training Will Be Provided to Personnel Involved in Valve line-ups (← links)
- 05000263/LER-1984-024, :on 840627,during Cold Shutdown,Reactor Bldg Ventilation Isolation & Standby Gas Treatment Sys Initiation Occurred.Channel a Reactor Bldg Vent Wide Range Gas Monitor Deenergized.Caused by Personnel Error (← links)
- 05000263/LER-1984-029, :on 840915,emergency Diesel Generator 12 Started.Caused by Closing Auxiliary Reserve Transformer 1AR, Supply Breaker Disconnects Out of Sequence & Failure to Reinstall Transformer Fuses (← links)
- 05000263/LER-1984-026, :on 840910,reactor Bldg Isolation & Initiation of Standby Gas Treatment Occurred.Caused by Closure of Wrong Sample Valve.Caution Statement Placed on wide-range Gas Monitor Sample Filter Changeout Procedure (← links)
- 05000263/LER-1984-022, :on 840605,reactor Bldg Ventilation Isolation & Standby Gas Treatment Initiation Occurred.Caused by Blown Fuse in Reactor Bldg Spent Fuel Pool Radiation Monitor Channel B.Fuse Replaced (← links)
- 05000263/LER-1984-020, :on 840530,Channels a & B Reactor Bldg Ventilation Wide Range Gas Monitors Tripped Due to Low Sample Flow.Caused by Plugged Sample Filters.Sample Flows Will Be Checked Once Per Shift During Outage (← links)
- 05000263/LER-1984-017, :on 840425,control Room HVAC Transferred to Emergency Mode When Ammonia Monitor Tape Cassette Ran Out Causing Spurious Monitor Trip.Caused by Failure to Replace Cassette as Scheduled.Procedure Revised (← links)
- 05000263/LER-1984-019, :on 840427,control Room HVAC Transferred to Emergency Mode Due to Tape Cassette Jam & Subsequent Spurious Trip of Chlorine Monitor.Cause Could Not Be Determined.Cassette Repaired (← links)
- 05000263/LER-1984-018, :on 840425,during Shutdown,Channel B Reactor Bldg Vent Wide Range Gas Monitor Isolated Reactor Bldg Ventilation & Started Standby Gas Treatment Sys When Noise Spike Caused Registration of High Radiation (← links)
- 05000263/LER-1978-001-01, /01T-0:on 780105,nonconconforming Bolts Found in Radwaste Shipping Cask.Caused by Cask Supplier Error.Cask Handling Procedure Will Be Revised to Include Verification of Proper Bolt Size (← links)
- 05000263/LER-1978-002-01, /01T-0:on 780202,torus to Drywell Vacuum Breaker AO-2382B Failed to Close as Required by Tech Spec 3.7.A.4. Caused by Excess Friction Between Shaft & Bushings.Bushings Will Be Replaced (← links)
- 05000263/LER-1978-003-03, /03L-0:on 780228,during Surveillance Test,Min Flow in a Train SBGTS Could Not Be Attained as Required by Tech Spec 3.7.B.1.Caused by Foreign Matl in BV-4 Positioner. Replaced Positioner (← links)
- 05000263/LER-1978-004-03, /03L-0:on 780421,during Surveillance Test RWCU Outboard Isolation Valve MO-2398 Failed to Close First Time Switch Placed in Close Position.Cause Unknown (← links)
- 05000263/LER-1978-007-03, /03L-0:on 780508,steam Leak Discovered in 45 Degree Elbow on HPCI Steam Supply Line Drain Line to Condenser.Caused by Erosion.Temporary Clamp Repair Made (← links)
- 05000263/LER-1978-011-01, /01T-0:on 780606,four of Six APRM Scram Trip Settings Three to Four Percent Low.Aprm Calibr at 50% Power. Gain Settings Corrected (← links)
- 05000263/LER-1978-009-03, /03L-0:on 780525,trip of Essential MCC B33A Supply Breaker 52-304 Resulted in Operation in Degraded Mode Permitted by Various Lco.Cause Unknown.Evaluation Continuing (← links)
- 05000263/LER-1978-008-03, /03L-0:on 780525,inlet Air Heater Operating at Reduced Capacity Due to Fuse Failure.Fuse Block & Fuses Replaced in Kind (← links)
- 05000263/LER-1978-010-03, /03L-0:on 780605,CRD 06-19 Delayed for Indefinite Period of Time.Caused by Buna N Disc in Scram Pilot Solenoid Plunger Broken in Several Pieces.Plunger Including Disc Replaced (← links)
- 05000263/LER-1978-012-03, /03L-0:on 780616,lightning Storm Resulted in Plant Substation Lockouts Deenergizing Auxiliary Reserve Transformer.Relay Failed Due to Short Circuit Failure of Zener Diode in Trip Pulse Isolator Output (← links)
- 05000263/LER-1978-014-01, /01T-0:on 780728,CRD 30-47 Delayed Approx 1.4 Before Scramming.Disc in Scram Pilot Valve Solenoid Plunger Broken Into Several Pieces,Wedging & Preventing Valve from Venting Air on Scram Valves (← links)
- 05000263/LER-1978-015-03, /03L-0:on 780805,one APRM Scram Trip Setting at Four to Five Percent Low.Caused by Large Power Shape Changes Resulting in LPRM Output Changes.Gain Setting Corrected.W/ (← links)
- 05000263/LER-1978-013-03, /03L-0:on 780719,steam Leak in 90 Degree Elbow on Turbine Main Steam Bypass Header Drain Line to Condenser. Caused by Erosion.Restricting Orifice,Leaking Elbow & Addl Piping & Elbows to Be Inspected & Replaced (← links)
- 05000263/LER-1975-018, :on 750914,snubber Located Inside Drywell on B Loop LPCI Line Discovered Low on Oil.Caused by Improperly Installed Seal.Affected Part Replaced (← links)
- 05000263/LER-1975-019, :on 750921,count Rate of SRM Decreased Below 3 Cps.Fuel Reloaded Near Detector.Operational Limit Above 3 Cps Will Be Established to Prevent Recurrence (← links)
- 05000263/LER-1984-023, :on 840621,emergency Standby Diesel Generator 12 Fast Started Due to Deenergized Offsite Source Undervoltage Relay.Caused by Inaccurate Instructions.Warning Instruction Placed on Breaker (← links)
- 05000263/LER-1984-011, :on 840218 & 23,crack Indications Detected on Loop Jet Pump B Instrument Seal & on Loops a & B of RHR LPCI Lines.Caused by Intergranular Stress Corrosion Cracking.Affected Matls Replaced (← links)
- 05000263/LER-1995-003-01, :on 950328,pipe & Cable Tray Supports Found Anchored to Shoring Plates Rather than Embedded Plates. Caused by Error in Original Const.Supports Modified or Analyzed & Meet Code Requirements (← links)
- 05000263/LER-1984-010, :on 840217,emergency Filtration Train Sys Control Room HVAC Transferred to Toxic Chemical Emergency Mode.Caused by Release of Chlorine Into Chlorine Tank Storage Room (← links)
- 05000263/LER-1984-009, :on 840207,EFT Sys (Control Room HVAC) Transferred to Emergency Mode Due to Toxic Chemical Detector Tape Break.Caused by Excessive Friction Between Optics Block & Tape.Spring Tension Reduced & Block Replaced (← links)
- 05000263/LER-1984-006, :on 840119,reactor Bldg Isolation & Initiation of Standby Gas Treatment Occurred When Radiation Check Source Brought Too Close to Refuel Floor Spent Fuel Pool Monitor.Area Radiation Monitor Relocated (← links)
- 05000263/LER-1983-026-03, /03L-0:on 831205,outboard Steam Isolation Valve MO-2076 Failed to Close.Caused by Loose Screw Bumping Lead, Causing Torque Switch in Limitorque Valve to Fail Open. Switch Replaced (← links)
- 05000263/LER-1995-006-01, :on 950610,drain Valve Not Fully re-closed During Surveillance of SJAE OG RM Chamber Rendering Both SJAE RMs Inoperable.Caused by Personnel/Cognitive Error. Training Provided & Procedure Changed (← links)
- 05000263/LER-1976-002, :on 760405,during Monthly Surveillance Test,Rcic Turbine Tripped Once.Caused by High Exhaust Line Pressure During Start of Turbine.Trip Setpoint Increased (← links)
- 05000263/LER-1976-003, :on 760504,during Test,Primary Containment Oxygen Concentration Found Above Tech Spec Limit.Caused by Leaking Asco Solenoid Valve.Solenoid Valve Isolated (← links)
- 05000263/LER-1976-004, :on 760515,during Normal Operation,Crack Discovered at 3/4-inch Vent Connection on 6-inch Moisture Separator Drain Line B.Caused by Fatigue Due to Cyclic Relative Motion.Crack Repaired (← links)
- 05000263/LER-1976-005, :on 760520,during 100% Power Operation,Tip Ball Valve 3 Failed to Close During Routine Use of TIP Sys. Cause Unknown.Valve Cleaned & Lubricated (← links)
- 05000263/LER-1976-006, :on 760603,during Test,Hpci Steam Line Inboard Isolation Valve Failed to Close Completely.Caused by Torque Switch Setting Drifting Too Low.Switch Reset (← links)
- 05000263/LER-1976-007, :on 760714,during Special Test,Safety Relief Valve 2-71A Failed to Actuate When Given Manual Initiation Signal. Caused by Stripped Threads Where Solenoid Plunger Assembly Screws Into Main Solenoid Valve Body (← links)
- 05000263/LER-1976-008, :on 760626,during Normal Operation,Loss of Power to Reserve Transformer 1AR Experienced.Cause Suspected to Be Lightning Induced Voltages Across Sudden Pressure Relay Contacts.Relay Scheme Modified (← links)
- 05000263/LER-1976-009, :on 760722,during Routine Surveillance Test,Main Steam Line Low Pressure Isolation Switch 2-134C Tripped at 808 Psig.Caused by Setpoint Drift.Setpoint Revised (← links)
- 05000263/LER-1976-010, :on 760725,during Test,Torus Purge Inlet Valve AO-2381 Failed to Close Immediately.Cause Unknown.Valve Placed on Increased Surveillance Program (← links)
- 05000263/LER-1976-013, :on 760811,during Routine Surveillance Test,Main Stop Valve Closure Scram Limit Switch 2 Failed.Caused by Position Indication Limit Switch Adjusted Such That Switch Failed to Actuate Under Hot Conditions (← links)
- 05000263/LER-1976-014, :on 760811,during Startup,Primary Containment Dioxide Concentration Not Reduced to Less than 5% within 24 H After Going Into Run Mode.Caused by Failed Metal Bellows Co Model MN-115 Pump Bellows (← links)
- 05000263/LER-1976-015, :on 760825,during Normal Operation,Loss of Power to Shutdown Cooling Outboard Isolation Valve Experienced. Caused by Failure of Undervoltage Relay Coil.Part Replaced (← links)
- 05000263/LER-1976-016, :on 760828,during Insp of Condenser area,1-inch Elbow Found Leaking on HP Turbine Inlet Steam Line U-bend Drain Line.Erosion of Wall Caused by Hot Steam Flashing After Passing Through Orifice (← links)
- 05000263/LER-1976-017, :on 760902,during Normal Operation,Rhr Torus Cooling Injection Valve MO-2008 Failed to Open for Torus Cooldown Following Routine HPCI Surveillance.Caused by Loosened Stem Clamp.Clamp Welded to Stem (← links)
- 05000263/LER-1976-019, :on 760919,during Test,Scram Relay Did Not Deenergize Due to MSIV Not Full Open.Fuse Pulled to Deenergize Relay.Insy Did Not Reveal Cause.Limit Switch Replaced (← links)
- 05000263/LER-1976-020, :on 760929,during Normal Operation,Crack Discovered at Connection of Reactor Feedpump Inboard Seal Cooler to Seal Cooling Return Line.Caused by vibration- Induced Fatigue.Hx Isolated (← links)
- 05000263/LER-1976-022, :on 761010,during Test,Diesel Generator 11 Failed to Start on Starting Sys 2.Caused by Rust Particles Clogging Bleedoff in Air Relay.Sys Cleaned (← links)
- 05000263/LER-1976-023-01, :on 760924,surveillance Coordinator Failed to Locate Main Steam Line Radiation Monitor Functional Test Scheduled for Wk of 760912.Caused by Test Overlooked & Not Assigned for Completion (← links)
- 05000263/LER-1976-024, :on 761112,while Performing Insp of Condenser area,1-inch Elbow Found Leaking on HP Turbine Bypass Header Drain Line.Caused by Hot Steam Flashing After Passing Through Orifice.Elbow Repair Welded (← links)
- 05000263/LER-1977-002, :on 770125,during Procedural Review,Standby Gas Treatment Sys Flow Rate Not Recorded Monthly to Demonstrate Compliance w/760927 Tech Spec Change.Procedure Revised to Provide Monthly Flow Record (← links)
- 05000263/LER-1977-001, :on 770118,during Normal Operation,Accumulator on Control Rod Drive Hydraulic Control Unit 14-19 Declared Inoperable.Caused by Failure to Hold Pressure Due to Leaking Stem Packing.Packing Replaced (← links)
- 05000263/LER-1993-008, :on 930731,RPS Trip Occurred.Caused by Reduction in Reactor FW Flow Due to Ground Fault Relay Trip of Main Condensate Pump.Motor Replaced During 1994 Refueling Outage (← links)
- 05000263/LER-1995-004-01, :on 950518,an Electrical Assembly tripped,de- Energizing B RPS Bus.Caused by Aging of Electrolytic Capacitor.Capacitor Replaced (← links)
- 05000263/LER-1995-005-01, :on 950518,two Main RB Supply Fans Tripped. Caused by Electrical Disturbance on 345 Kv Power Lines Connected to Plant Substation.Ventilation Configuration Changed (← links)
- 05000263/LER-1984-011-01, Revised LER 84-011-01:on 840218,crack Indications Discovered in Listed Locations,Including RHR Sys & Recirculation Sys Pump Suction & Discharge Valves.Caused by Igscc.Stainless Steel 304 to Be Replaced (← links)
- 05000263/LER-1984-016, :on 840408,spurious Trip of Channel B Fuel Pool Radiation Monitor Isolation Reactor Bldg Ventilation Started Standby Gas Treatment Sys.No Cause Found.Monitor Setpoint Verified & Source Check Performed (← links)
- 05000263/LER-1984-014, :on 840322,lightning Arrestor Assembly Failed, Causing Full 3-phase Fault Affecting Nearly Entire Area Distribution Sys.Caused by Mechanical Failure.Affected Sys Reset & Returned to Normal (← links)
- 05000263/LER-1984-015, :on 840325,motor Source Breaker to Reactor Protection Sys Power Supply Motor Generator Set 11 Tripped. Caused by Breaker Unit A-phase Setpoint Drift.Unit Replaced W/Ge Type Tfk Trip Unit (← links)
- 05000263/LER-1995-002-01, :on 950118,identified That Div I Backup Scram Valve Operator & Div I Low Low Set Logic in Same Fused Circuit.Caused by Personnel Error,Not Classifying as safety- Related.Coil Dedicated to Safety Related (← links)
- 05000263/LER-1983-021-03, /03L-0:on 831019,calibr of Safeguards Bus Degraded Voltage Relays Performed 8 Days Beyond Allowable Schedule Deviation.Caused by Scheduling Error.Personnel Instructed & Schedule Form Revised (← links)
- 05000263/LER-1983-023-03, /03L-0:on 831026,flow Through Train B Standby Gas Treatment Less than Tech Spec Requirement.Caused by Stack Exhaust Flow Incorrectly Adjusted.Stack Flow Corrected (← links)
- 05000263/LER-1983-022-01, /01T-0:on 831024,reactor Recirculation Motor Generator Set Drive Breaker Trip Coil Failed.Cause Unknown. Component Replaced (← links)
- 05000263/LER-1984-007, :on 840206,reactor Recirculation Motor Generator Set Drive Motor Breaker Failed to Open Remotely. Caused by Binding of Rollers.Rollers Cleaned & Repacked W/Vendor Approved Lubricant (← links)
- 05000263/LER-1984-008, :on 840207,operating Recirculation Pump (P) Shutdown & Associated Pump Set Generator Field Breaker Did Not Trip.Caused by Faulty Field Breaker.Maint Frequency Increased & All Bearings & Rollers Cleaned (← links)
- 05000263/LER-1983-020-03, /03L-0:on 830920,diesel Generator 11 Turbocharger Auxiliary Lube Oil Pump Motor Bearing Failed.Cause Not stated.Pump-motor Assembly Replaced (← links)
- 05000263/LER-1982-017-03, Outboard Ms Drain Isolation Valve MO-2374 Exceeded Tech Spec Table 3.7.1 Required Closure Time.Caused by Dc Motor Malfunction.Motor Replaced (← links)
- 05000263/LER-1995-001, :on 950206,missed Grab Sample on SW Radiation While Maint Was Being Performed on Sample Pump.Caused by No Administrative Aids to Ensure That Shift Took Required Samples.Took Sample Immediately (← links)
- 05000263/LER-1984-004, :on 840110,emergency Filtration Train Transferred to Emergency Mode in Control Room Hvac.Caused by Chlorine Monitor Tape Cassette Running Out,Resulting in Tape Break & Spurious Monitor Trip (← links)
- 05000263/LER-1984-003, :on 840109,while Performing HPCI High Steam Flow Sensor Test & Calibr,Time Delayed High Steam Flow Isolation Signal Exceeded Tech Spec Limit.Probably Caused by Foreign Matl Between Diaphragm Exhaust (← links)
- 05000263/LER-1984-002, :on 840107,control Room HVAC Sys Automatically Transferred to Toxic Chemical Emergency Mode Due to Spurious Trip of Hydrogen Chloride Monitor AT-9036.Cause Unknown. Investigation Revealed No Apparent Cause (← links)
- 05000263/LER-1983-018-03, /03L-0:on 830718,RHR Pump 11 Declared Inoperable Following Failure of Min Flow Valve CV1994 to Open as Required Due to Flow Switch Failure.Caused by Microswitch Contact Wear Due to flow-induced Vibration (← links)
- 05000263/LER-1994-010, :on 940919,leakage Rate of Primary Containment Exceeded TS Limits.Caused by Test Methodology & Wear. Valve Body Seat on in Board MSIV on a Main Steamline Was Replaced (← links)
- 05000263/LER-1991-010, :on 910507,reaction Protection Sys Actuation Occurred.Caused by Spurious Increase of Intermediate Range Monitor Signals.Investigation Initiated.Procedures Revised (← links)
- 05000263/LER-1994-018, :on 941026,automatic Transfer of HPCI Suction from Condensate Storage Tanks to Torus on High Torus Level During Surveillance Testing.Caused by Lack of Appropriate Procedure Action.Guideline Will Be Established (← links)
- 05000263/LER-1994-017, :on 941023,HPCI Isolated on High Steam Flow During Test at Lower than Normal Pressure.Preventative Maint Procedure for HPCI Sys Revised (← links)
- 05000263/LER-1994-016, :on 941017,partial Containment Isolation Occurred.Caused by Lack of Proper Procedural Prerequisite in Excess Flow Check Valve Test Procedure.Excess Flow Check Test Revised (← links)
- 05000263/LER-1994-012, :on 940930,fire Door 61 Did Not Have Required Door Latch Throw,Error Was Made During Original Plant Const. Latch on Fire Door 61 Was Replaced W/Latch w/3/4 Throw (← links)
- 05000263/LER-1994-014, :on 941013,missed Procedural Step While Switching Power Supply to Reactor Protection Sys to Alternate Source Causes Partial Ci.Ci Signal Reset & Isolation Sys Returned to Svc as Necessary (← links)
- 05000263/LER-1994-013, :on 941013,spurious 480 Vac Breaker Trip de-energizes 120 Vac Instrument Bus Resulting in Partial Ci. Training Will Be Provided to Operations Personnel on Appropriate Actions (← links)
- 05000263/LER-1994-015, :on 941015,failed Component in Uniterruptible Power Supply Inverter Causes Partial Containment.Caused by Failure of Static Switch Logic Card.Ci Signals Reset & Isolated Sys Returned to Svc as Necessary (← links)
- 05000263/LER-1994-009, :on 941007,EDG Received Fast Start Signal & Started.Caused by Personnel Error.Edg Were Secured & Surveillance on Safeguards Bus Was Completed (← links)
- 05000263/LER-1983-015-01, /01T-0:on 830613,investigation of 250-volt Dc Battery Fault Revealed Grounded HPCI Woodward Governor EDR Hydraulic Actuator Coil.Caused by out-of-spec Nonhomogeneous Lube Oil.Lube Oil Replaced (← links)
- 05000263/LER-1983-005-03, /03L-0:on 830216,RHR Pump 14 Made Inoperable to Investigate Head Capacity Reduction.Caused by Mophead in Pump Suction,Probably Entering RHR Sys During Maint or Const Projects.Mophead Removed (← links)
- 05000263/LER-1983-010-03, /03L-0:on 830226,during Surveillance Testing, Outboard MSIV,AO-2-86B Closed Faster than Value Stated in Tech Spec Table 3.7.1.Caused by Oil Leak from Needle Valve Assembly on Bottom Dashpot Cylinder Head (← links)
- 05000263/LER-1994-002, :on 940324,determined That Instantaneous Trip of 480 Vac MCCBs Does Not Meet Acceptance Trip Due to Mfg Design.Revised PMP for 480 Vac Molded Case Circuit Breakers (← links)
- 05000263/LER-1994-002-01, Provides Suppl Rept to LER 94-002-01.Suppl Rept Corrects Error Re Labeling of Axes for Graph of Instantaneous Trip Settings Vs Actual Current to Trip (← links)
- 05000263/LER-1994-003, :on 940415,transmission Sys Electrical Fault on 345 Kv Sys Caused Protective Relaying to Trip Plant Equipment.Wave Trap Repaired (← links)
- 05000263/LER-1994-007, :on 940622,discovered Inoperable Fire Barrier in Division II Battery Room.Caused by Cognitive Human Errors.Hourly Fire Watch Was Established & Gaps Were Filled W/Grout (← links)
- 05000263/LER-1994-005, :on 940608,safety/relief Valve Was Found to Be Disconnected from Valve Operator.Causes Unknown.New Fitting Was Installed on Safety Relief Valve (← links)
- 05000263/LER-1994-004-01, :on 940604 & 20,lightning Strikes Occurred, Resulting in Reactor Scram & Group 2 Containment Isolation, Respectively.Pressure Transmitter PT-7495A & Radiation Monitor RM-17-453B Will Be Modified (← links)
- 05000263/LER-1993-009-01, :on 930826,draftsman Discovered Unmarked Computer Diskette Containing Safeguards Info Drawings on Desk.Caused by Inadequate Safeguard Controls Procedures. Heightened Security Measures Implemented (← links)
- 05000263/LER-1982-016-01, /01T-0:on 820928,three Indications in 22-inch Diameter Reactor Recirculation Sys Riser Manifold End Cap Confirmed as Rejectable.Caused by Intergranular Stress Corrosion Cracking.End Cap to Be Replaced (← links)
- 05000263/LER-1982-014-01, /01T-0:on 821012,drywell Atmospheric Control Sys 2-inch,600-lb Inboard Isolation Bypass Valve CV-2385 Found Leaking in Excess of Tech Specs.Caused by Worn Groove in Disk Face.Disk Machined,Lapped & Reinstalled (← links)
- 05000263/LER-1982-012-01, /01T-0:on 820909,18 & 20-inch,150-lb T-seated Primary Containment Purge & Vent Valves Found Leaking in Excess of Tech Specs.Caused by Valves Improperly Closing & Seating Probably Due to T-ring Interference (← links)
- 05000263/LER-1982-011-01, /01T-0:on 820903,3-inch Outboard Main Steam Drain Isolation Valve MO-2374 Found Leaking in Excess of Tech Specs.Caused by Steam Eroding Valve Disc Due to Misalignment of Disc to Seat Ring.Seats Ground (← links)
- 05000263/LER-1982-010-01, /01T-0:on 820902,8-inch,150-lb RCIC Turbine Exhaust Check Valve 9 Found Leaking in Excess of Tech Specs. Caused by Leaking Valve Seat Due to Poor Svc Conditions. Disk & Seat Ring Replaced (← links)
- 05000263/LER-1989-021-01, :on 890916,crack Was Discovered on Upper Support Brace of Jet Pump.Caused by High Cycle Fatigue. Corrective Action:Recirculation Pump Speed Was Limited & Testing Demonstrated Cracking Is self-limiting (← links)
- 05000263/LER-1982-008-03, /03L-0:on 820830,RCIC Barometer Condenser Cooling Water Supply Valve Failed.Caused by Severed Stem Due to Rotork Motor Operator Torque Switch Misadjustment.Valve Stem Replaced (← links)
- 05000263/LER-1982-007-03, /03L-0:on 820726,while Attempting to Add Oil to Governor During Monthly Diesel Generator Test,Personnel Changed Adjustment of Governor Shutdown Solenoid.Caused by Personnel Error.New Governor Installed.Procedure Revised (← links)
- 05000263/LER-1981-017-03, While Removing Insulation,Cracks Discovered on 4-inch & 1-inch Reactor Water Cleanup HX Piping,Where Connected to Hx.Caused by Poor fit-up & Welding.Slag Line Removed & Weld Repaired (← links)
- 05000263/LER-1991-009, :on 910427,determined That Cables for Secondary Containment Isolation Damper Solenoids & SGTS Components Did Not Meet Separation Requirements in Several Locations.Caused by Personnel Error.Solenoid Cables Rerouted (← links)
- 05000263/LER-1978-027-03, /03L-0 on 781121:during Normal Oper a Steam Leak Was Found in Tee Downstream of MO-1197 on the 2 HP Turbine U Bend Drain Line to Condenser,Probably Due to Flow of Steam & Water from Restricting Orifice Into Tee (← links)
- 05000263/LER-1978-020-03, /03L-0 on 781121:during Normal Pwr Increase,Both Indicating Lights for MO-2014,LPCI a Loop Admission Valve Were Out Due to Blown Control Pwr Fuse.Fuse Had Opened on Slight Over Load for Extended Time Period & Was Replaced (← links)
- 05000263/LER-1978-029-01, /01T-0 on 781214:High Pressure Instrument Channel Relay Failed to Energize Due to Disengaged Agastat CR0095 Relay Socket Contact That Failed to Make Contact W/Agastat FPB750 Relay Contact.Contacts Were Reengaged (← links)
- 05000263/LER-1978-028, Forwards LER 78-028/03L-0 (← links)
- 05000263/LER-1978-021, Forwards LER 78-021/03L-0 (← links)
- 05000263/LER-1978-022, Forwards LER 78-022/03L-0 (← links)
- 05000263/LER-1978-018-03, /03L-0 on 781002:during Routine Surveillance Test, HPCI Isolation Temp Switch Model 17023-6 Failed to Trip,Due to Loose Wire Inside Switch.Redundant Switches Tested Satisfatorily (← links)
- 05000263/LER-1993-003, :on 930131,determined That TS Leakage Limit for Individual MSIVs Exceeded.Results of Analysis of Samples of Oxide Film Found on Valves Seats Indicated Normal Coolant Concentrations.Long Term Mods Being Evaluated (← links)
- 05000263/LER-1991-016, :on 910405,discovered Failure of non-safety Isolation Valve Could Block Flow of Emergency Svc Water Through Unit Condensers.Caused by Design Inadequacy.C/A: Valve Secured in Open Position (← links)
- 05000263/LER-1993-010-01, :on 931027,main Control Room Emergency Filtration Train Found Outside Design Basis.Caused by in-leakage Across Inlet Dampers.Both Crv/Eft Trains Modified to Eliminate Outside in-leakage (← links)
- 05000263/LER-1993-008-01, :on 930731,RPS Tripped from Reactor Low Water Level.Caused by Main Condensate Pump Trip.Condensate Pump 11 Motor Will Be Inspected & Preventive Maint Will Be Performed on Condensate Pump 11 Breaker (← links)
- 05000263/LER-1977-024-07, 7:on 770910,A Outboard MSIV Found Leaking in Excess.Caused by Plug Being Slightly Out of Round.Seats Lapped & Valve Retested (← links)
- 05000263/LER-1977-024-06, 6:on 771012,inboard Isolation Valve on Nitrogen Instrument Air Sys Found Leaking in Excess.Caused by Accumulation of Dirt & Scale on Seating Surface.Valve Seats Cleaned (← links)
- 05000263/LER-1977-024-05, 5:on 771004,RCIC-9 Turbine Exhaust Line Check Valve Found Leaking in Excess.Caused by Improper Seating Due to Bent Disc Washer.Damaged Parts Replaced & Stop Added to Prevent Striking (← links)
- 05000263/LER-1977-024-04, 4:on 770916,HPCI-9,turbine Exhaust Line Check Valve Leaking in Excess.Caused by Accumulated Dirt on Seating Surfaces.Seats Cleaned & Lapped (← links)
- 05000263/LER-1977-024-03, 3:on 770913,core Spray Valves Found Leaking in Excess of Tech Spec Limits.Caused by Accumulation of Scale on Seating Surfaces.Valve Seats Cleaned (← links)
- 05000263/LER-1977-024-02, 2:on 770910,main Steam Drain Inboard Isolation Valve MO-2373 Found Leaking in Excess of Tech Spec.Caused by Light Deposits of Foreign Matl on Seats.Seats Lapped,Plug Machined & Valve Retested Satisfactorily (← links)
- 05000263/LER-1977-024-01, 1:on 771013,A Inboard MSIV,AO-2-80A Found Leaking Inexcess of Tech Spec Acceptance Criteria.Seats Lapped & Valve Retested Satisfactorily (← links)
- 05000263/LER-1977-021, :on 770810,CRD HCU 30-11 Nitrogen Charging Valve on Accumulator Would Not Hold Pressure.Caused by Leaking Stem Packing.Program Will Be Initiated to Replace Packing in Similar Valves (← links)
- 05000263/LER-1977-022, :on 770828,MO-2013 B RHR Injection Valve Failed to Open.Control Relays Installed in Breaker to Reduce Control Wire Voltage Drop (← links)
- 05000263/LER-1977-025, :on 770913,recalculated ECCS Thermal Limits Found to Be More Restrictive than Tech Spec Limits.Limiting Break Size & Revised Thermal Limits (← links)
- 05000263/LER-1977-023, :on 770909,RHR Torus Cooling Valve Mo 2009 Failed to Operate Properly.Caused by Inadequate Stem Clamp Set Screws for Unseating Torque.Stem Clamp W/Keyway Being Installed (← links)
- 05000263/LER-1977-026, :on 770911,elbow on F SRV Discharge Line Found Deformed.Caused by Inadequate Restraint on Discharge Line. Addl Support Being Installed to Reduce Displacement of Line (← links)
- 05000263/LER-1977-027, :on 770923,RHR Torus Cooling Valve Body Seat Ring Threads Found to Be Stripped.Caused by Rotation of Plug Which Unscrewed Seat.Mod in Process to Hold Seat in Place Using Bolding Ring Welded to Valve Body (← links)
- 05000263/LER-1977-031, :on 771013,noted Torus Internal Catwalk Sections Not Attached in Same Manner.All Locations Will Be Upgraded to Design Requirements Prior to End of Outage (← links)
- 05000263/LER-1977-029, :on 771002,three Main Steam Line Area Temp Switches Found to Trip Above Allowable Tech Spec Setting.Switches Recalibrated (← links)
- 05000263/LER-1977-030, :on 771010,discovered Leak from B RHR Loop Relief Valve 2005 2 Boss Connection.Caused by Excess Cyclic Moment Induced by Unrestrained Vibration During Shutdown Cooling Operation.Relief Restraint Installed (← links)
- 05000263/LER-1977-003, :on 770127,TIP Ball Valve Failed to Close During Use of Sys.Cause Undetermined.Valve Disassembled,Inspected & Found in Good Condition (← links)
- 05000263/LER-1976-018, :on 760909,investigation of Drywell Torus Pressure Differential Effect on Torus Water Level Vol Correllation Disclosed Vol Slightly Below Tech Spec Limit.Water Vol Increased & New Vol Vs Level Correlation Issued (← links)
- 05000263/LER-1975-016, :on 750826,discovered That Control Circuit for Valve MO-2036,steam Supply to HPCI Turbine Deenergized. Caused by Relay Coil Which Open Circuited.Relay Coil Replaced in Kind (← links)
- 05000263/LER-1980-025-03, Outboard HPCI Steam Supply Valve Operator Failed & Inboard Valve Closed.Caused by Breakdown of Motor Winding Insulation in Peerless Dc Motor on SMB-O Operator.Motor Replaced W/Class H Motor (← links)
- 05000263/LER-1982-006-03, /03L-0:on 820504,during Normal Operation,Leak Discovered in 11 RHR Hx.Caused by HX Gasket Leak.Head Cover Flange Seal Welded to Floating Tube Sheet.Hx Control Valves Repaired.Manufacturer Proposed New Cover Design (← links)
- 05000263/LER-1982-005-03, /03L-0:on 820408,lead Lifted in Control Circuitry for Outboard Shutdown Cooling valve,MO-2030,rendering Valve Inoperable.Caused by Misinterpretation of Special Operating Procedure.Lead Reinstalled & Procedures Revised (← links)
- 05000263/LER-1982-005, Forwards LER 82-005/03L-0 (← links)
- 05000263/LER-1982-004-01, /01T-0:on 820410,ASCO Inboard & Outboard Drywell Vent 3-way Solenoid Valves,Model 830064C64U,failed to Close Upon Hand Switch Activation When Coil de-energized.Probably Caused by Horizontally Mounted Solenoids.Valves Replace (← links)
- 05000263/LER-1981-001-03, While Performing Surveillance Test Mo 2035,HPCI Outboard Steam Supply Isolation Valve Failed to Close.Caused by Opened Limitorque SMB-O,240-volt Dc & Torque Switches.Switches Replaced (← links)
- 05000263/LER-1981-001, Forwards Updated LER 81-001/03X-1 (← links)
- 05000263/LER-1993-007-01, :on 930604,ESF Actuation Occurred Due to Loss of Reactor Protection Sys Power Supply.Replaced Failed Relay & Returned Motor Generator Set to Svc (← links)
- 05000263/LER-1993-006, :on 930323,RPM Actuation Occurred from High Pressure Caused by Inadequate Procedure.Turbine Stop & Control Valve Tightness Test Procedures & Plant Simulator Revised (← links)
- 05000263/LER-1989-040-01, :on 891219,secondary Containment Failed to Meet Operability Requirements During Special Test.Caused by Design Deficiencies.Operating Procedures Revised & Administrative Hold Placed on One Sys Component (← links)
- 05000263/LER-1990-001-01, :on 900313,design Deficiencies Noted in Emergency Filter Train Sys.On 930315,determined That Train B of CR Emergency Filtration Sys Could Not Provide Adequate Flow.Alternate Measuring Sys Method Implemented (← links)
- 05000263/LER-1982-003-03, /03L-0:on 820212,reactor Water Cleanup Primary Containment Inboard Isolation Valve MO-2397 Became Inoperable While in Full Open Position.Caused by Normally Energized Relay Coil 16A-K36 Shorting.Relay Replaced (← links)
- 05000263/LER-1982-003, Forwards LER 82-003/03L-0 (← links)
- 05000263/LER-1982-002-03, /03L-0:on 820107,core Spray Pump 11 Start Time Delay Relay Failed to Operate.Caused by Loose Terminal Connection & Microswitch Contact Burned Open.New GE CR 2820 Relay Installed (← links)
- 05000263/LER-1982-002, Forwards LER 82-002/03L-0 (← links)
- 05000263/LER-1982-001-01, /01T-0:on 820102,outboard Shutdown Cooling Suction Isolation Valve Found to Exceed Tech Spec Limits for Local Leak Rate Test.Caused by Valve Disc,Undersized by Extensive Lapping of Disc & Valve Body Seats,Traveling Too Far (← links)
- 05000263/LER-1982-001, Forwards LER 82-001/01T-0 (← links)
- 05000263/LER-1981-021, /03L-0:on 811110,during Cold shutdown,4 Channel a Main Steam Line High Flow Switches Found Inoperable.Caused by Heating of Switching Element Due to Relay Coil Failure, Initially Reported in LER 81-021.Elements Replaced (← links)
- 05000263/LER-1981-023, Forwards LER 81-023/03L-0 (← links)
- 05000263/LER-1981-016, Forwards LER 81-016/01T-0 (← links)
- 05000263/LER-1992-016-01, Forwards LER 92-016-01 Re Failure of Emergency Svc Water Check Valves to Seat Due to Accumulation of Silt.Evaluation Will Be Performed to Determine Feasibility of Replacing Check Valves ESW-13 & ESW-14 (← links)
- 05000263/LER-1989-040, :on 891219,secondary Containment Failed to Meet Operability Requirements for Secondary Containment Capability.Caused by Design Deficiencies.On 930317,addl Design Deficiency Noted Re Damper Controls (← links)
- 05000263/LER-1990-001, :on 900313,design Deficiencies Noted in Emergency Filter Train Sys.Ventilation Units & Ductwork Isolated.On 930315,determined That Train B of CR Emergency Filtration Sys Could Not Supply Adequate Flow (← links)
- 05000263/LER-1990-001-05, Forwards LER 90-001-05 Re Potential Emergency Filter Train Sys Inoperability Due to Interaction w/nonsafety-related Equipment.New NRC Commitments Listed (← links)
- 05000263/LER-1993-005-01, :on 930315,480-volt LPCI Swing Bus Transferred to Alternate Power Supply During Simulated Actuation Test of Eccs.Caused by Inadequate Info Re DG Voltage Regulator.Bus Transferred to Normal Power Source (← links)
- 05000263/LER-1993-004-01, :on 930310,discovered Primary Containment Isolation.Caused by Blown Fuse.Fuse Replaced,Cabinet Inspected,Isolation Reset & Shutdown Cooling Returned to Svc (← links)
- 05000263/LER-1993-002-01, :on 930131,discovered Closure of Primary Containment Isolation Valves Due to Reactor Protection Sys Breaker Failure.Breaker Replaced & Power Restored to Reactor Protection Sys (← links)
- 05000263/LER-1993-001-02, :on 930129,potential Single Failure Identified That Could Affect Both Trains of Sbgts.Caused by Desing Error.Mod Will Be Completed to Eliminate Potential Single Failure of Electric Room Heater (← links)
- 05000263/LER-1981-024-01, /01T-0:on 811112,during Maint Shutdown & PM on Hpci,Discovered Abnormal Wear in Woodwear Governor Bracket. Caused by Failed Components Due to Thrust Washer Failure Causing Bushings to Seize to Shaft & Distort Casing (← links)
- 05000263/LER-1981-024, Forwards LER 81-024/01T-0 (← links)
- 05000263/LER-1981-019-03, /03L-0:on 811022,flow Through B Train Standby Gas Treatment Noted Less than Tech Spec.Caused by Dirt in Tubing from Flow Sensor at Offgas Stack Resulting in Closed Inlet Dampers on Stack Dilution Fans.Tubing Blown Out (← links)
- 05000263/LER-1981-019, Forwards LER 81-019/03L-0 (← links)
- 05000263/LER-1981-022-01, /01T-0:on 811030,during Inservice Insp on Core Spray Loop B Safe End to Reducer Weld,Detected Several non- through-wall Crack Indications in HAZ on Reducer.Probably Caused by Igscc.Replaced Reducer & Valve (← links)
- 05000263/LER-1981-022, Forwards LER 81-022/01T-0 (← links)
- 05000263/LER-1981-021-01, /01T-0:on 811024,during Cold Shutdown Primary Containment Isolation Sys Logic Relay Coil Failed & Relay Did Not Immediately Trip.Caused by Natural end-of-life. Replaced Relay (← links)
- 05000263/LER-1989-021, :on 890916,crack Was Discovered on Upper Support Brace of One Jet Pump Riser.Caused by High Cycle Fatigue.Testing Has Demonstrated That Cracking Is Self Limiting (← links)
- 05000263/LER-1994-001-01, :on 940323,missed Surveillance on SRV Low-Low Set Logic.Caused by Incorrect Surveillance Procedure Prerequisite.Corrective Action:Removed Incorrect Prerequisites,Trained on Procedure Review (← links)
- 05000263/LER-1983-001, Forwards LER 83-001/01T-0 (← links)
- 05000263/LER-1981-020-03, /03L-0:on 810724,main Steam Leak Revealed in Drain Line to Condenser.Caused by Piping Leaking Immediately Downstream of 45 Degree Elbow Due to Erosion & Impingement Resulting from Steam & Water Flow from Restricting Orifice (← links)
- 05000263/LER-1981-020, Forwards LER 81-020/03L-0 (← links)
- 05000263/LER-1991-008, :on 910422,cracking Discovered on Control Rod Drive Housing Flange Cap Screws.Caused by Inadequate Design of Screws.Four New,Original Equipment Cap Screws Installed & Reactor Vessel Hydro Performed (← links)
- 05000263/LER-1981-018-03, /03L-0:on 810620,reactor Water Cleanup Sys Was Returned to Svc Following Maint W/Discharge Isolation Valve MO2399 Open & Inoperable.Caused by Torque Switch Failure. Motor & Torque Switch Replaced & Sys Returned to Svc (← links)
- 05000263/LER-1981-018, Forwards LER 81-018/03L-0 (← links)
- 05000263/LER-1994-006, :on 940620,group 2 Isolation Occurred Due to Operator Turning Wrong Switch & Deenergizing Radiation Monitor.Operator Disciplined & Radiation Monitor Switches Modified (← links)
- 05000263/LER-1980-027-03, /03L-0:on 80823,during Monthly surveillance,42-11 Test Control Rod Could Not Be Withdrawn After Partial Insertion.Caused by Closed Drive Withdraw Riser Isolation Valve CRD-102.Valve Opened & Rod Was Operable (← links)
- 05000263/LER-1980-027, Forwards LER 80-027/03L-0 (← links)
- 05000263/LER-1980-020, Forwards LER 80-020/03L-0 (← links)
- 05000263/LER-1980-018, Forwards LER 80-018/03L-0 (← links)
- 05000263/LER-1980-023, Forwards LER 80-023/03L-0 (← links)
- 05000263/LER-1980-022, Forwards LER 80-022/03L-0 (← links)
- 05000263/LER-1980-021, Forwards LER 80-021/03L-0 (← links)
- 05000263/LER-1980-013, Forwards LER 80-013/01T-0 (← links)
- 05000263/LER-1980-007, Forwards LER 80-007/01T-0 (← links)
- 05000263/LER-1980-017, Forwards LER 80-017/01T-0 (← links)
- 05000263/LER-1980-015, Forwards LER 80-015/01T-0 (← links)
- 05000263/LER-1980-006, Forwards LER 80-006/03L-0 (← links)
- 05000263/LER-1980-016, Forwards LER 80-016/01T-0 (← links)
- 05000263/LER-1980-011, Forwards LER 80-011/01T-0 (← links)
- 05000263/LER-1979-002, Forwards LER 79-002/03L-0 (← links)
- 05000263/LER-1978-016, Forwards LER 78-016/03X-1 (← links)
- 05000263/LER-1979-003, Forwards LER 79-003/01T-0 (← links)
- 05000263/LER-1979-001, Forwards LER 79-001/03L-0 (← links)
- 05000263/LER-1979-024, Forwards LER 79-024/03L-0 (← links)
- 05000263/LER-1979-021, Forwards LER 79-021/03L-0 (← links)
- 05000263/LER-1979-017, Forwards LER 79-017/03L-0 (← links)
- 05000263/LER-1979-011, Forwards LER 79-011/03L-0 (← links)
- 05000263/LER-1979-015, Forwards LER 79-015/03L-0 (← links)
- 05000263/LER-1979-013, Forwards LER 79-013/03L-0 (← links)
- 05000263/LER-1979-014, Forwards LER 79-014/03L-0 (← links)
- 05000263/LER-1979-012, Forwards LER 79-012/03L-0 (← links)
- 05000263/LER-2019-002, Two Manual Primary Containment Isolation Valves Found Open Resulting in a Condition Prohibited by Technical Specification (← links)
- 05000263/LER-1979-020, Forwards LER 79-020/03L-0 (← links)
- 05000263/LER-1979-019, Forwards LER 79-019/03L-0 (← links)
- 05000263/LER-1979-018, Forwards LER 79-018/03L-0 (← links)
- 05000263/LER-1979-016, Forwards LER 79-016/03L-0 (← links)
- 05000263/LER-2019-001, RHR Decay Heat Removal Pump Start Permissive Logic Hardening Error (← links)
- 05000263/LER-2018-002, C Outboard Main Steam Line Isolation Valve Delayed Closure Due to Foreign Material in the Air Valve (← links)
- 05000263/LER-2018-001, Cancellation of LER 2018-001-00 for Monticello Re Non-Fully Closed Check Valves Resulted in a Potential Pathway Outside of Secondary Containment and Follow-up to Interim Part 21 Report of a Deviation or Failure to Comply (← links)
- 05000263/LER-1917-006, Regarding Loss of Reactor Protection System Scram Function During Main Steam Isolation Valve and Turbine Stop Valve Channel Functional Tests Due to Use of a Test Fixture (← links)
- 05000263/LER-1917-005, Regarding Diesel Generator Emergency Service Water System Automatic Transfer to Alternate Shutdown Panel (← links)
- 05000263/LER-1917-004, Regarding High Pressure Coolant Injection Steam Stop Valve Failed to Open During Test (← links)
- 05000263/LER-1917-003, Regarding Main Steam Isolation Valve Leakage Exceeds Technical Specification Limits (← links)
- 05000263/LER-1917-002, Regarding Main Steam Isolation Valve Closure Time Outside of Technical Specification Requirements (← links)
- 05000263/LER-1917-001, Regarding Reactor Scram and Group II Isolation Due to 11 Reactor Feed Pump (RFP) Removal from Service with 12 RFP Isolated (← links)
- 05000263/LER-1916-003-01, Regarding HPCI Declared Inoperable Due to Excessive Water Level in Turbine (← links)
- 05000263/LER-2016-002, Regarding Inadequate Appendix R Fire Barrier Impacts Safe Shutdown Capability (← links)
- 05000263/LER-2016-001, Regarding High Pressure Coolant Injection System Cracked Pipe Nipple Caused Oil Leak (← links)
- 05000263/LER-2015-007, Regarding Loss of Residual Heat Removal Capability (← links)
- 05000263/LER-2015-006, Regarding Reactor Scram Due to Group 1 Isolation from Foreign Material in the Main Steam Flow Instrument Line (← links)
- 05000263/LER-2015-005, Regarding Use of the Reactor Water Cleanup System to Lower Level Without Declaring an OPDRV with Secondary Containment Inoperable - Extent of Condition Review (← links)
- 05000263/LER-2015-004, Regarding Past Inoperability of Turbine Stop Valve Scram Function Exceeded Technical Specification Requirements (← links)
- 05000263/LER-2015-003, Regarding Use of the Reactor Water Cleanup System to Lower Level Without Declaring an Operation with a Potential to Drain the Reactor Vessel (OPDRV) with Secondary Containment Inoperable (← links)
- 05000263/LER-2014-010-02, Regarding Physical Security Plan Inaccuracy Revealed Past Security Vulnerability (← links)
- 05000263/LER-2015-002, From Monticello Nuclear Generating Plant Regarding Loss of Shutdown Cooling Due to Improperly Landed Jumper Wire (← links)
- 05000263/LER-2015-001, Regarding Operations with a Potential to Drain the Reactor Vessel (OPDRV) Without Secondary Containment Operable (← links)
- 05000263/LER-2014-011, Regarding Two Emergency Diesels Inoperable Due to Human Error (← links)
- 05000263/LER-2013-007-02, Regarding Unanalyzed Condition Due to Inadequate Flooding Procedures (← links)
- 05000263/LER-2014-008, Regarding Opening Identified in Fire Barrier (← links)
- 05000263/LER-2014-007, Regarding Non-compliance with Technical Specification 3.4.9 - Reactor Coolant System Pressure and Temperature Limits (← links)
- 05000263/LER-2014-006, Regarding Secondary Containment Doors Opened Simultaneously (← links)
- 05000263/LER-2014-005, Regarding Appendix R Fire Door Failed to Latch (← links)
- 05000263/LER-2014-004, Time to Energize Loads Greater than Surveillance Requirement (← links)
- 05000263/LER-2014-003, Regarding Torus to Drywell Vacuum Breaker Dual Indication During Testing (← links)
- 05000263/LER-2014-002, Regarding Torus to Drywell Vacuum Breaker Did Not Indicate Closed During Testing (← links)
- 05000263/LER-2013-007-01, Regarding Unanalyzed Condition Due to Inadequate Flooding Procedures (← links)
- 05000263/LER-2014-001, Regarding Primary System Leakage Found in Recirculation Pump Upper Seal Heat Exchanger (← links)
- 05000263/LER-2013-008-01, Regarding Both Secondary Containment Access Doors Briefly Opened Simultaneously (← links)
- 05000263/LER-2013-003-02, Regarding Inadequate External Flooding Procedure (← links)
- 05000263/LER-2013-006-01, Regarding Unanalyzed Condition for Emergency Diesel Generator Fuel Oil Pumps Train Separation (← links)
- 05000263/LER-2013-000-08, Both Secondary Containment Access Doors Briefly Opened Simultaneously (← links)
- 05000263/LER-2013-007, Regarding Unanalyzed Condition Due to Inadequate Flooding Procedures (← links)
- 05000263/LER-2013-006, Regarding Unanalyzed Condition for Emergency Diesel Generator Fuel Oil Pumps Train Separation (← links)
- 05000263/LER-2013-003-01, Regarding Inadequate External Flooding Procedure (← links)
- 05000263/LER-2013-005, Transmittal of LER 13-005-00 for Monticello Regarding Discovered Vulnerability in Safeguards System (← links)
- 05000263/LER-2013-004, Loss of Normal Off-Site Power as a Result of Switch Gear Fault (← links)
- 05000263/LER-2013-003, Regarding Inadequate External Flooding Procedure (← links)
- 05000263/LER-2013-002, Regarding Essential Bus Transfer During 2R Transformer Testing (← links)
- 05000263/LER-2013-001, E SRV Low-Low Set Tailpipe Dp Root Valve Found Closed (← links)
- 05000263/LER-2012-003-01, Regarding Automatic Reactor Scram During Maintenance on 4160V 12-Bus Ammeter (← links)
- 05000263/LER-2012-005, Regarding Partial Group II Isolation During Removal of Original Steam Dryer (← links)
- 05000263/LER-2012-004, Regarding High Pressure Coolant Injection Inoperable When Inverter Is Out of Service (← links)
- 05000263/LER-2012-003, Regarding Automatic Reactor Scram During Maintenance on 4160V 12-Bus Ammeter (← links)
- 05000263/LER-2012-002-01, Transmittal of LER 12-002-01 for Monticello Regarding Discovered Vulnerability in Safeguards System (← links)
- 05000263/LER-2012-002, Transmittal of LER 12-002-00 for Monticello Discovered Vulnerability in Safeguards System (← links)
- 05000263/LER-2012-001, Regarding Degraded Voltage Transfer Scheme Not in Compliance with T.S. 3.3.8.1 (← links)
- 05000263/LER-2011-011, Regarding Failure to Lock Mode Switch in Refuel Position During Control Rod Exercise (← links)
- 05000263/LER-2011-010, Regarding Rod Worth Minimizer Bypassed During Startup (← links)
- 05000263/LER-2011-009, Regarding Automatic Reactor Scram While Performing Turbine-Generator Testing (← links)
- 05000263/LER-2011-008, Regarding Reactor Scram Due to Loss of Normal Offsite Power (← links)
- 05000263/LER-2011-007, Regarding Both Emergency Diesel Generators Declared Inoperable Due to Inadequate Surveillance (← links)
- 05000263/LER-2011-006, Regarding Lntake Structure Fire Suppression System Blockage (← links)
- 05000263/LER-1979-024-03, /03L-0:on 791220,during Normal Operation,Routine Operator Insp Revealed Steam Leak in 1-inch 90 Degree Elbow in Reactor Core Isolation Cooling Steam Line Drain to Condenser.Caused by Pinhole Failure of 3,000-lb Socket Weld (← links)
- 05000263/LER-1979-023, Updated LER 79-023/01T-1:on 800103,one Fuel Type Noted to Exceed Max Allowable Max Average Planar Linear Heat Generation Rate Value & Another as Improperly Programmed in Plant Computer.Caused by Inadequate Review (← links)
- 05000263/LER-1979-022-03, /03L-0:on 791213,during Normal Operation,Leak Discovered in 90-degree Elbow on 1-inch Condensate Line from Steam Supply to Recombiner Train Drain Trap.Caused by Erosion from Hot Steam Drains.Elbow Modified (← links)
- 05000263/LER-1979-021-03, /03L-0:on 791119,during IE Bulletin 79-02 Evaluation,Snubber SS-31 Base Plate Expansion Anchor Bolt Safety Factor Found to Be Less than One.Caused by Inadequate Base Plate & Expansion Anchor Bolts (← links)
- 05000263/LER-1979-019-03, /03L-0:on 790923,ECCS Yarway Level Switches Indicated Falsely High Level & Would Not Have Tripped within Specified Settings.Caused by Effects of Leak Which Developed in Reactor Pressure Gauge During Normal Operation (← links)
- 05000263/LER-1979-017-03, /03L-0:on 790806,steam Leak Observed on Feedwater Extraction Steam Line Drain 15A.Caused by Steam Erosion Through Wall of Steam Trap on Line.Trap Isolated Pending Repair or Replacement at Next Appropriate Outage (← links)
- 05000263/LER-1979-016-03, /03L-0 on 790731:turbine Tripped on Low Oil Pressure.Caused by Clogged Lube Oil Filter.Sys Drained, Inspected & Flushed (← links)
- 05000263/LER-1979-015-03, /03L-0 on 790712:discovered Steam Leak from Intermediate Pressure Feedwater Heater.Cause Undetermined. Temporary Patch Installed Pending Replacement of Heater Shell (← links)
- 05000263/LER-1979-013-03, /03L-0 on 790708:motor Operator Failed,Rendering Torus Cooling Injection Valve Inoperable During Normal Operation.Caused by Failure of Motor Winding Due to Limit Switch Not de-energizing Motor.Switch Replaced (← links)
- 05000263/LER-1979-014-03, /03L-0 on 790709:water Leak Discovered in 1/2 Inch Instrument Line from Reactor Water Cleanup Sys Nonregenerative Heat Exchanger.Cause Not Determined.Leaking Line Isolated & Will Be Further Investigated & Repaired (← links)
- 05000263/LER-1979-012-03, /03L-0 on 790702:during Reactor Core Isolation Cooling Sys Test,Governor end-bearing Temp Alarm Received & Bearing Exhibited High Vibration.Sys Inoperative.Caused by Turbine Oil Pump Drive Gear Failure.Gears Replaced (← links)
- 05000263/LER-1979-011-03, /03L-0 on 790529:no Min Flow in B Train Standby Gas Treatment Sys.Caused by Dilution Flow from Compressed Storage Not Isolated by BV-5.Replaced Positioner & Installed Filter in Cylinder Supply/Return Line (← links)
- 05000263/LER-1979-010-01, /01T-0 on 790426:informed by General Motors of Potential Diesel Generator Turbocharger Problem.Caused by Inadequate Design of Lube Oil Sys.Mod Being Developed (← links)
- 05000263/LER-1979-009-03, /03L-0 on 790404:steam Leak Found in 90 Degree Elbow in 1-inch Core Isolation Cooling Steam Supply Drain Pot Condenser Line.Caused by Erosion Due to High Velocity Steam from Leaking Valve.Hole Patched.Repairs Planned (← links)
- 05000263/LER-1979-020-03, /03L-0:on 791030,reactor Core Isolation Cooling Isolation Temp Switch Found to Trip Above Allowable Setpoint.Caused by Setpoint Drift.Switch Replaced (← links)
- 05000263/LER-1980-023-03, /03L-0:on 800601,air Ejector Offgas Radiation Monitors Dropped to About 20% Normal for About 40 Minutes. Caused by Mechanical Vacuum Pump Offgas Sample Valve Being Incorrectly Opened.Valve Now Wired Shut (← links)
- 05000263/LER-1980-022-03, /03L-0:on 800529,primary Containment Oxygen Concentration Exceeded 5% by Weight Tech Spec Limit.Caused by Open Svc Air Isolation Valve to Drywell.Procedures Have Been Revised to Assure Proper Valve Positioning (← links)
- 05000263/LER-1980-021-03, /03L-0:on 800515,during Normal Startup,Reactor Core Isolation Cooling Control Power Fuse Opened.Caused by Shorted Relay Coil in Circuit Due to Ac Relay Inadvertently Installed by Maint Personnel.Relay Replaced (← links)
- 05000263/LER-1980-020-03, /03L-0:on 800427,during post-maint Startup of Reactor Recirculation Sys,Inaccessible Recirculation Valve Motor Failed.Cause Not Stated.Motor Is Limitorque Type SMB-2 W/Magnetic Brake (← links)
- 05000263/LER-1980-018-03, /03L-0:on 800411,during Routine Operator Insp, Attachment Weld of Ripple to Level Switch Float Chamber Assembly on Moisture Separator Level Switch LS-1188 Found Cracked.Caused by Improper Weld Procedure (← links)
- 05000263/LER-1980-017-01, /01T-0:on 800328,Bechtel Power Corp Notified Util That Control Rod Driveline Hydraulic Piping Frame Supports Would Not Meet OBE Stress Limits.Caused by Eds Computer Code Error.Supports Modified (← links)
- 05000263/LER-1980-016-01, /01T-0:on 800327,during Refueling,Supports for SRV Pneumatic Supply Sys Would Not Meet Seismic Class I Requirements.Caused by Inadequate Design & Installation of Sys.Sys Was Upgraded to Satisfy Requirements (← links)
- 05000263/LER-1980-015-01, /01T-0:on 800317,during Refueling Outage & Insp Required by IE Bulletin 79-01B,unqualified Splices Found in Power Cables for Inboard MSIV Solenoid Valves.Cause Not Stated.Splices Replaced W/Qualified Matls (← links)
- 05000263/LER-1980-006-03, /03L-0:on 800226,during Refueling Outage,Seven of Main Steam Line Area Temp Switches Found to Trip Above Required Level.Caused by Setpoint Drift.Switches Recalibr (← links)
- 05000263/LER-1980-011-01, /01T-0:on 800306,during Refueling Outage,Repairs to Outboard MSIV Stop Valve Revealed Flow Path Between Secondary Containment & Turbine Bldg When MSIV Poppet Was Pulled.Caused by Lack of Preventive Procedure Controls (← links)
- 05000263/LER-1980-013-01, /01T-0:on 800309,during Refueling Operations,Rod Withdrawn Block Not Received When Refueling Bridge Traversed Core.Caused by Actuating Arm Out of Adjustment.Components Readjusted & Interlocks Tested Prior to Refueling (← links)
- 05000263/LER-1980-007-01, /01T-0:on 800303,during Refuel Shutdown,Cable Routing for HPCI & Automatic Depressurization Sys Cables Identified Lack of Physical Separation Between Automatic Depressurization Sys Cables & Ones for Div of HPCI Sensors (← links)
- 05000263/LER-1979-007-03, /03L-0 on 790318:valve Operability & Motor Current Check Signed Despite Current Outside Formula Spec.Caused by Misaligned Torque Switch.New Components Ordered (← links)
- 05000263/LER-1979-005-03, /03L-0 on 790315:results of Special Test of Safety Relief Valve Effects on Torus Indicated Possible Excessive Opening Delay Time.Caused by Improper Installation of Insulation on Valve 67F.Maint Procedure to Modified (← links)
- 05000263/LER-1979-008-01, /01T-0 on 790323:one Trip Output Relay Failed to Initiate Trip in No 12 Recirculation Motor Generator Set Field Breaker Trip Logic.Caused by Contact Which Was Disengaged from Socket.Contact re-engaged in Socket (← links)
- 05000263/LER-1979-003-01, /01T-0 on 790301:containment Vent & Purge Isolation Valves Would Not Close During DBA-LOCA.Cause Unknown.Fisher Continential 18 & 20 Inch,Type 9220 Butterfly Valves Opening Is Administratively Controlled (← links)
- 05000263/LER-1979-002-03, /03L-0 on 790118:during Normal Operation,Weekly Average Power Range Monitor Functional Scram Test Was Not Completed within Time Allowed.Caused by Personnel Error (← links)
- 05000263/LER-1978-029, Forwards LER 78-029/01T-0 (← links)
- 05000263/LER-1978-028-03, /03L-0 on 781124:during Normal Oper,Small Steam Leak Was Discovered in Weld of 45 Degree Elbow on HPCI Steam Supply Line 1 Inch Drain Line to Main Condenser Due to Corrrosion.Weld Repair Made at Leak.Awaiting Parts (← links)
- 05000263/LER-1978-021-03, /03L-0 on 781114:during Refueling Outage While Testing RHR SW Sys,A Pinhole Leak Was Discovered in CV-1729, RHR SW Differential Pressure Control Valve.Caused by Corrosion & Erosion of Upper Valve Body (← links)
- 05000263/LER-1978-022-03, /03L-0 on 781117:steam Leak Was Discovered in a 1 Wye Strainer,YS-4002,on the Main Steam Equalizer Drain Line. Leak Caused by a Defective Casting & Dev After Two Days of Svc (← links)
- 05000263/LER-1978-018, Forwards LER 78-018/03L-0 (← links)
- 05000263/LER-1979-001-03, /03L-0 on 790110:during Normal Operation,Steam Leak Found in Elbow on Turbine Main Steam Bypass Header 1 Inch Drain Line to Condenser,Due to Erosion Caused by Steam & Water Flow of Restricting orifice,RO-2569 (← links)
- 05000263/LER-1978-016-03, /03X-1 on 780908:during Normal Operation,Trip of Essential MCC B33A Supply Breaker 52-304 Resulted in Operation in Degraded Mode.Caused by Low Setpoint on Trip Device & by Loss of Dash Pot Oil in Trip Device (← links)
- 05000263/LER-1978-030-01, X on 781218:found That MO-2-54A, Recirculation Loop 11 Discharge Bypass Valve Would Not Close.Cause of Failure Not Yet Determined (← links)
- 05000263/LER-1978-027, Forwards LER 78-027/03L-0 (← links)
- 05000263/LER-1978-020, Forwards LER 78-020/03L-0 (← links)
- 05000263/LER-1979-006-01, /01T-0 on 790317:during Recirculator Motor Generator Shutdown,Associated Field Breaker Failed to Trip. Caused by Metal Bead Fused to Arc Chute.Bead Removed,Breaker Tested & Returned to Svc (← links)
- 05000263/LER-1979-004-01, /01T-0 on 790313:shipping Cask Model B-2 Found W/ Two Missing Lid Bolt Nuts,Missing Inner Lid Gasket & Damaged Outer Lid Gasket.Caused by Inadequate Insp & Maint by Supplier.Cask Returned Empty (← links)
- 05000263/LER-2011-005, Regarding Power Range Monitor Channels Out of Alignment (← links)
- 05000263/LER-2011-004, Regarding Secondary Containment Inoperability Due to Ventilation Alignment Issue (← links)
- 05000263/LER-2011-003, Regarding Secondary Containment Damper Icing (← links)
- 05000263/LER-2011-002, Regarding ESF Actuation Due to Failed Power Supply (← links)
- 05000263/LER-2011-001, For Monticello Nuclear Generating Plant, Reactor Vessel Overfill in Appendix R Scenario (← links)
- 05000263/LER-2010-006, Mode Change Made with PCIVs Inoperable (← links)
- 05000263/LER-2010-004, Regarding Secondary Containment Briefly Inoperable Due to Simultaneous Opening of Airlock Doors (← links)
- 05000263/LER-2010-005, For Monticello Regarding Average Power Range Monitor Indication Outside Allowable Range (← links)
- 05000263/LER-2010-003, Regarding Secondary Containment Briefly Degraded (← links)
- 05000263/LER-2010-002, Regarding Secondary Containment Briefly Degraded (← links)
- 05000263/LER-2010-001, Re Missed Safety Relief Valve Lift Test Surveillance Interval (← links)
- 05000263/LER-2009-005, Regarding Failed Fusible Link on Door 18 (← links)
- 05000263/LER-2009-001, Containment Overpressure Not Ensured in the Appendix R Analysis (← links)
- 05000263/LER-2009-004, Missed Technical Specification Action for Failed Technical Specification Surveillance on Standby Gas Treatment System (← links)
- 05000263/LER-2009-003, Main Steam Line B Flow Isolation Instrumentation Inoperable Due to Leaking Equalizing Manifold Valve (← links)
- 05000263/LER-2009-002, For Monticello, Regarding Pipe Whip for High Energy Line Break (← links)
- 05000263/LER-2008-008, For Monticello, Regarding Technical Specification Required Shutdown Margin Not Met During All Conditions for Refueling Outage 23 (← links)
- 05000263/LER-2008-007, Loss of Shutdown Cooling Due to ESF Actuation (← links)