Pages that link to "05000281/LER-2014-001, Regarding Pressurizer Safety Valves Fail As-Found Setpoint Testing"

The following pages link to 05000281/LER-2014-001, Regarding Pressurizer Safety Valves Fail As-Found Setpoint Testing:

Displayed 4 items.

• 05000281/LER-2014-001 (redirect page) ‎ (← links)
  • 05000281/LER-2006-002 ‎ (← links)
  • 05000281/LER-2003-001 ‎ (← links)
  • 05000281/LER-2001-001 ‎ (← links)
  • IR 05000280/2014004 ‎ (← links)
  • 05000281/LER-1982-037, Forwards LER 82-037/03L-0 ‎ (← links)
  • 05000281/LER-1982-023, Forwards LER 82-023/03L-0 ‎ (← links)
  • 05000281/LER-1982-056, Forwards LER 82-056/03L-0 ‎ (← links)
  • 05000281/LER-1981-075, Forwards LER 81-075/03L-0 ‎ (← links)
  • 05000281/LER-1982-046, Forwards LER 82-046/03L-0 & Updated LER 80-010/01X-1 ‎ (← links)
  • 05000281/LER-1983-001, Forwards LER 83-001/03L-0 & Updated LERs 81-052/03X-1 & 81-074/03X-1 ‎ (← links)
  • 05000281/LER-1982-076, Forwards LER 82-076/03L-0 ‎ (← links)
  • 05000281/LER-1982-067, Forwards LER 82-067/03L-0 ‎ (← links)
  • 05000281/LER-1983-014, Forwards LERs 83-013/03L-0 & 83-014/03L-0.W/o LER 83-014/03L-0 ‎ (← links)
  • 05000281/LER-1975-012, Suppl to LER 75-12/01T:on 750706,reactor Trip Occurred. Caused by Sudden Closure of Trip Valve in Main Steam Line B Followed by Closure of Main Steam Line Valves a & C ‎ (← links)
  • 05000281/LER-1976-015, Updated LER 76-15/03L:on 761006,leakage of Water Observed from Recirculation Spray HX a Piping.Caused by Cracking in Heat Affected Zones of Several Welds.Listed Piping Will Be Replaced ‎ (← links)
  • 05000281/LER-1976-003, Updated LER 76-03/01T:on 760521,routine Chemistry Analysis of Primary Coolant Boron Concentration Indicated Unplanned Dilution Occurred.Caused by Three Tubes Cut on Steam Generator 2A.Tubes Plugged ‎ (← links)
  • 05000281/LER-1975-005, Updated LER 75-05/010:on 750225,radial Trip of Max 2.5% Existed.Caused by Prolonged Recovery of Rod F-2.Control Room Alarm Did Not Function Due to Defective Circuit Card. Card Replaced & Staff Cautioned ‎ (← links)
  • 05000281/LER-1992-001, Corrected Page 3 to LER 92-001-00 Re 920130 Mechanical Failure Due to Oil Leak from Charging Pump a Bearing & Damper Remaining Closed on Charging Pump B ‎ (← links)
  • 05000281/LER-1983-008, Forwards LER 83-008/03L-0 ‎ (← links)
  • 05000281/LER-1983-007, Forwards LER 83-007/03L-0 ‎ (← links)
  • 05000281/LER-2020-001, Loss of Containment Cooling Affecting Partial Pressure Indication ‎ (← links)
  • 05000281/LER-1987-004-03, :on 870831,while Performing Surveillance Procedure,Containment Cooling Water Outlet Header Isolation Trip Valve Found Inoperable.Caused by Ruptured Diaphragm in Air Pilot Relay.Relay Replaced ‎ (← links)
  • 05000281/LER-1999-004-02, :on 981109,EDG Was Inoperable Longer than Allowed by TS Due to Governor Compensation Valve.Root Cause Evaluation Being Performed to Determine How Compensation Valve Became Closed ‎ (← links)
  • 05000281/LER-1986-016-01, :on 861116,containment Radiation Monitor Trip Valves TV-RM-200A,B & C Closed on Safeguards Signal.Caused by Inadequate Procedure.Procedure Will Be Modified ‎ (← links)
  • 05000281/LER-1986-015-02, :on 861031,pressurizer Safety Valves Had Lift Setpoints Outside Allowable Limits During Refueling Surveillance Testing.Safety Valve Setpoints Reset.Vendor Failure Analysis Underway ‎ (← links)
  • 05000281/LER-1986-014-02, :on 861010,results of Type C Containment Leakage Testing Indicated That Inside & Outside Containment Sump Trip Valves Had Leakage Greater than 300 Scfh.Caused by Erosion of Plug & Seat.Valves Will Be Replaced ‎ (← links)
  • 05000281/LER-1986-008, :on 860706,low Head Safety Injection Pump Discharge Isolation Valve to Cold Leg Found Energized in Open Position.Cause Undetermined.Procedural Changes Will Be Implemented ‎ (← links)
  • 05000281/LER-1986-013-02, :on 861005,auxiliary Feedwater Pumps Started & Steam Generator Blowdown Trip Valves Closed.Caused by Cycling of Auxiliary Lube Oil Pump for Main Feed Pump (MFP) & Trip of MFP Breaker.Procedures Changed ‎ (← links)
  • 05000281/LER-1986-009-03, :on 860709,reactor Trip Breaker Opened Following Spurious RCS Low Flow Signal.Caused by Personnel Error During Replacement of Failed Reactor Protection Sys Train B Relay.Individual Counseled ‎ (← links)
  • 05000281/LER-1986-010-02, :on 860711,pump B Discharge Pressure Dropped to Zero,Causing Inoperability of Both Charging Pumps a & B. Caused by Air Introduced in Sys During Maint on Pump A.Pump Vented.Both Pumps Returned to Svc ‎ (← links)
  • 05000281/LER-1986-012-03, :on 860821,during Monthly Performance Test, Relay LM-REL-200A1 Found Failed & on 860826 Relay R-LM-REL-200A2 Found Failed.Caused by Intermittent Operation of Comparator.Relays Replaced & Tested ‎ (← links)
  • 05000281/LER-1999-003-02, :on 990705,auto Reactor Trip on Low Coolant Flow,Occurred.Caused by Loop Stop Valve Failure.Approved RCE Recommendations,Designed to Prevent Recurrence of Similar Event Will Be Implemented Through CAP ‎ (← links)
  • 05000281/LER-1997-002-03, :on 970713,CR annunciator,2-RMA-A-7 for Main Steam Line Effluent High Range Radiation Monitors Alarmed. Caused by Intermittent Component Failure.Preplanned Alternate Method of Monitoring Initiated ‎ (← links)
  • 05000281/LER-1986-018-02, :on 861112,environmentally Qualified Components Found Not Installed Per Approved Raychem Guidelines.Caused by Procedures Not Conforming to Raychem Application Guide. Procedures Revised ‎ (← links)
  • 05000281/LER-1986-015-01, :on 861031,pressurizer Safety Valve Setpoints Found Outside Allowable Limits.Caused by Failure to Compensate for Operating Temp & Valve Wear.Valves Replaced & Setpoints Reset ‎ (← links)
  • 05000281/LER-1986-020-01, Forwards LER 86-020-01 & Reactor Trip & Feedwater Pipe Failure Rept ‎ (← links)
  • 05000281/LER-1986-020, :on 861209,reactor Tripped Due to Low Water Level in Steam Generator C (EIIS-SG).Caused by Improper Reassembly of Valve Following Maint.Unit Inspected & Tested Prior to Startup ‎ (← links)
  • 05000281/LER-1986-019-01, :on 861201,individual Rod Position Indicators (Irpi) for Control Rods Out of Calibr.Caused by Instrument Drift.All Inoperable Irpis Recalibr & Returned to Svc ‎ (← links)
  • 05000281/LER-1986-017-02, :on 861121,during Periodic Test 8.5A, Inadvertent Auto Start of Emergency Diesel Generator 3 (EIIS-ER) Occurred.Caused by Personnel Error.Testing Suspended & Diesel Shut Down ‎ (← links)
  • 05000281/LER-1986-007-02, :on 860617,reactor Trip Occurred Due to High Level in Steam Generator A.Caused by Failure of Valve FCV-2478 to Close Due to Metal Debris Between Plug & Valve Seat.Metal Debris Removed & Valve Reassembled ‎ (← links)
  • 05000281/LER-1986-012-02, :on 860821,during Monthly Performance Test, Relay LM-REL-200A1 Found Failed & on 860826,relay LM-REL-200A2 Found Failed.Caused by Intermittent Operation of Comparator.Relays Replaced & Tested ‎ (← links)
  • 05000281/LER-1986-005-01, :on 860511,overpower Delta T Reactor Trip Occurred When Spurious Rod Signals from Emergency Buses Caused Turbine Runback.Caused by Malfunctioning Auto Load Tap Changer on Transformer.Changer replaced.W/860610 1tr ‎ (← links)
  • 05000281/LER-1999-001-02, :on 990301,RPS Relay Not Placed in Trip Resulted in Violation of TS 3.7.Caused by Lack of Procedural Guidance.Developed New Procedure to Provide More Explicit Instructions for Placing Stop Valve in Relay Trip ‎ (← links)
  • 05000281/LER-1985-008, :on 850619,auxiliary Ventilation Damper 1-VS-MOD-58A Drifted Closed.Caused by Short in Damper Actuator Relief Valve Coil.Actuator Sent to Mfg for Overhaul ‎ (← links)
  • 05000281/LER-1986-011-02, :on 860720,determined That Svc Water Leaking Into Containment from Recirculation Spray HX (Rshx).Caused by Leaking Tubes in RSHX B.Tubes Plugged.Rshx Successfully Pressure Tested ‎ (← links)
  • 05000281/LER-1986-008-03, :on 860706,low Head Safety Injection Pump Discharge Isolation Valve MOV-2890C to Cold Legs Found Energized in Open Position.Human Performance Evaluation Will Be Performed to Determine Cause ‎ (← links)
  • 05000281/LER-1997-002-01, :on 970713,main Steam High Range Radiation Monitor Was Declared Inoperable.Caused by Equipment Failure. Preplanned Alternate Method of Monitoring Was Initiated IAW TS Table 3.7-6 ‎ (← links)
  • 05000281/LER-1986-006-03, :on 860616,svc Water Leak Discovered in Expansion Joint on Svc Water Return Line from Recirculation Spray Hx.Caused by Galvonic Corrosion.Expansion Joints Replaced & Carbon Steel on Joints Coated ‎ (← links)
  • 05000281/LER-1997-003-02, :on 971014,Unit 2 MSSVs Revealed That Lift Setting for Two MSSVs Were Outside as Found Setpoint Tolerance.Caused by Minor Setpoint Drift.Repaired,Revised & Adjusted Safety Valves ‎ (← links)
  • 05000281/LER-1997-004-02, :on 971202,invalid Mstv Indication Results in Manual Reactor Trip W/Esf Actuation Were Noted.Caused by Displaced Open Limit Switch Arms.Open Limit Switch for Mstv a Was Relocated Closer to Valve Position Bar ‎ (← links)
  • 05000281/LER-1986-004-02, :on 860219,during Test of Component Cooling Check Valves in RHR Sys,Operator Made Incorrect Valve Lineup Resulting in Isolation Component Cooling Flow to RHR HX a & B.Event Rept Placed in Operator Reading Manual ‎ (← links)
  • 05000281/LER-1986-003-03, :on 860216,turbine Tripped Due to High Level in Steam Generator B.Caused When Main Feedwater Bypass Valve B Failed to Close on Demand.Valve Failure Caused by Blockage in Air Pilot Relay.Blockage Dislodged ‎ (← links)
  • 05000281/LER-1985-010-01, :on 850813,turbine Runback to Approx 48% Power Occurred,Initiating Loss of Vital Bus 2-I.Caused by Tripped Transformer Breaker.Breakers Replaced ‎ (← links)
  • 05000281/LER-1984-013-01, :on 840807,reactor Trip Occurred from Completion of Two of Three Logic Matrix on Overpower Delta T Protection.Caused by Blown Control Power Fuse in Instrument Drawer Due to Technician Error ‎ (← links)
  • 05000281/LER-1984-017-02, :on 841207,drawing Error,Discovered During Tagging Record Review,Indicated That Auxiliary Feedwater Crosstie Capability Unavailable During 840929-1115.Drawing Change Request Initiated ‎ (← links)
  • 05000281/LER-1985-014-01, :on 851226,control Rod Urgent Failure Alarm Occurred as Rods Stepping in Automatic.Caused by Problem in Logic Cabinet Pulser Card A101.Card Replaced & Sys Tested Satisfactorily ‎ (← links)
  • 05000281/LER-1985-009-03, :on 851107,six Individual Rod Position Indicators in Controlling Bank D & One Indicator in Bank C Declared Inoperable Due to Incorrect Positions.Caused by Instrumentation Drift.Indicators Calibr ‎ (← links)
  • 05000281/LER-1985-013-02, :on 851107,turbine Trip/Reactor Trip Occurred as Result of High Steam Generator Level.Caused by Operator Inexperience W/Manual Feed Control During Low Power Startup Conditions.Status Tree Reviews Performed ‎ (← links)
  • 05000281/LER-1985-012-01, :on 851026,results of RCS Sample Indicated Drop in Boric Acid Concentration from 2,217 Ppm to 1,952 Ppm. Caused by Out of Calibr Flow Transmitter That Inputs to Boric Acid Integrator.Flow Transmitter Calibr ‎ (← links)
  • 05000281/LER-1985-009, :on 851107,individual Rod Position Indicators for Six Rods in Controlling Bank D & One Rod in Controlling Bank C Indicated More than 12 Steps from Bank Demand Position.Caused by Instrument Drift ‎ (← links)
  • 05000281/LER-1985-011-02, :on 851023,emergency Diesel Generator (EDG) Automatically Started.Caused by Inadequate Design Change Test Procedure.Control of EDG 2 Transferred to Main Control Room Panel & Diesel Shut Down ‎ (← links)
  • 05000281/LER-1985-003, :on 850423,outside Recirculation Spray Pump a Suction Valve Found Degraded & Pump B Valve Found Inoperable.Caused by Inadequate Sector Gear & Sheared Pins in Extension Shafts.Pins Replaced ‎ (← links)
  • 05000281/LER-1984-015, :on 841029,during Breaker Testing,Load Shedding Initiated & Main Feedpump Tripped Leading to Low Steam Generator Level & Reactor Trip.Caused by Inadequate Procedures.Procedure Revised ‎ (← links)
  • 05000281/LER-1985-010-02, :on 850813,unit Experienced Turbine Runback to Approx 48% Power Resulting in Partial Loss of Emergency Bus. Caused by Tripped Series Breaker to Vital Bus 2-1 Sola Transformer.Breakers Reset ‎ (← links)
  • 05000281/LER-1985-004-01, :on 850501,discrepancies Noted W/Rosemount Model 1153 Transmitters & Conax Environ Seal Assemblies. Caused by Overtorqued Hollow Screws in Transmitters & Improper Installation of Connectors ‎ (← links)
  • 05000281/LER-1984-021, :on 841216,trip Occurred When Breakers for Main Feed Pump B Opened.Caused by Excessive Drift in Pressure That Input Low Flow Signals to Recirculation Valve/Pump Trip Logic.Procedures Modified ‎ (← links)
  • 05000281/LER-1985-018-01, :on 850911,turbine Trip/Reactor Trip Occurred Due to Low Condenser Vacuum Signal.Caused by Operator Inadvertently Closing Four Condenser Inlet Valves While Throttling Four Condenser Outlet Valves ‎ (← links)
  • 05000281/LER-1983-046-03, /03L-0:on 831004,valve MOV-R5-255A Became Inoperable When Valve Operator Support Broke Loose from Floor Mounting During Attempt to Cycle Valve.Caused by Using Bolts W/Insufficient Strength to Attach Stand to Floor ‎ (← links)
  • 05000281/LER-1983-045-03, /03L-0:on 831008,w/unit Operating at 100% Power, Breaker for Valve MOV-2867D Found Open,Rendering Valve Inoperable.Caused by Accidental Bump While Opening Nearby Fire Door.Breaker Reclosed ‎ (← links)
  • 05000281/LER-1983-020-03, /03L-0:on 830413,while at 49% Power,Rod Position Indicators for E-11 & G-3 Greater than 12 Steps Out of Alignment W/Other Rods in Banks.Caused by Drift in Signal Conditioning Module.Instrumentation Calibr ‎ (← links)
  • 05000281/LER-1983-021-03, /03L-0:on 830413,while at 47% Power,Steam Flow Channel FI-2474 Indicated Less than Redundant Channel.Caused by Steam Leak in Transmitter Root Valve.Root Valve Replaced ‎ (← links)
  • 05000281/LER-1985-008-01, :on 850619,auxiliary Ventilation Damper I-VS-MOD-58A Drifted Closed.Cause Undetermined.Unit 2 Containment Purge Stopped & Damper Manually Opened.Parts Needed to Repair Actuator Ordered ‎ (← links)
  • 05000281/LER-1983-033-03, During 1983 Refueling Outage,Type C Testing Disclosed Leakage Exceeding Tech Spec Limits.Caused by Deterioration & Wear of Valves.Valves Repaired & Retested ‎ (← links)
  • 05000281/LER-1983-037-03, /03L-0:on 830918,w/unit at Cold Shutdown, During H & J Train Safety Injection Sys Tests,Main Feed Regulation Valve Would Not Fully Close on Signal.Cause Undetermined ‎ (← links)
  • 05000281/LER-1983-036-03, /03L-0:on 830918,w/unit at Cold Shutdown,During Performance of H & J Train Safety Injection Sys Tests, Feedwater Valve Would Not Fully Close on Signal.Caused by Out of Adjustment Pneumatic Relay Valves ‎ (← links)
  • 05000281/LER-1985-003-03, :on 850428,Type C Testing Revealed Both Outside Recirculation Spray Pump Suction Valves MOV-RS-255A, B(Eiis 20) Inoperable.On 850510,outside Recirculation Spray Pump Discharge Valve Inoperable ‎ (← links)
  • 05000281/LER-1985-002, :on 850215,charging Pump Intermediate Seal Coolers Discovered Improperly Aligned.Caused by Personnel Error.Proper Intermediate Seal Cooler Placed in Svc. Personnel Reinstructed Re Following Procedures ‎ (← links)
  • 05000281/LER-1985-007-02, :on 850612,spurious Safety Injection Occurred During Periodic Functional Test.Caused by Procedure Deficiency.Function Test Will Be Modified to Provide Separate Steps & Signoffs ‎ (← links)
  • 05000281/LER-1985-005-03, :on 850514 & 15,automatic Initiation of Hazard Zones 8 & 4,respectively,locked Out W/No Fire Watch Present. Caused by Lack of Procedure & Training.Procedure for CO2 Sys Lockouts Will Be Implemented ‎ (← links)
  • 05000281/LER-1985-004-03, :on 850501,degraded Terminal Screws Used to Terminate Field Wiring Inside Rosemount Transmitters & Conax Seal Assemblies Did Not Provide Positive Environ Seal. Caused by Overtorquing Hollow Screws ‎ (← links)
  • 05000281/LER-1984-021-02, :on 841216,w/unit at Approx 20% Power & Ramping Down for Secondary Sys Repair,Unit Tripped When Breakers for Main Feed Pump B Opened.Caused by Invalid Low Flow Condition.Trip Circuitry Tested ‎ (← links)
  • 05000281/LER-1984-019-02, :on 841211,reactor Trip Occurred.Caused by Low Condenser Vacuum Due to Leak in Moisture Separator Reheater Crossunder Manway Gasket.Manway Temporarily Sealed,Gasket Replaced & Procedure Revised ‎ (← links)
  • 05000281/LER-1984-018-02, :on 841211,spurious Reactor Trip Occurred. Caused by 2 of 3 Logic Matrix for High Pressurizer Level Actuating.Addl Administrative Controls for Work on Energized Components Initiated ‎ (← links)
  • 05000281/LER-1985-001-02, :on 850106,auxiliary Feed Pump Operated During Monthly Reactor Protection Logic Test,Contrary to Planned Evolution.Caused by Failure to Perform Test in Proper Sequence ‎ (← links)
  • 05000281/LER-1984-020-02, :on 841231,while Transferring Feed Flow from Bypass Valves to Main Feedwater Regulating Valves,Reactor Trip Occurred Due to Low Level W/Steam Flow/Feed Flow Mismatch in Steam Generator B ‎ (← links)
  • 05000281/LER-1984-016-03, :on 841120,reactor Tripped Due to Low Water Level in Steam Generator C.Caused by Main Feedwater Manual Isolation Valves Closing at Startup.Procedures Modified to Include Verification of Position of Valves ‎ (← links)
  • 05000281/LER-1984-015-01, :on 841029,main Feedpump a Tripped as Result of Load Shedding Leading to Low Steam Generator Level & Reactor Trip.Caused by Inadequate Procedures.Operating Procedures Will Be Revised ‎ (← links)
  • 05000281/LER-1985-002-03, :on 850215,svc Water Isolated to Charging Pump Intermediate Seal Cooler & Component Cooling Water Isolated.Caused by Valve Misposition Due to Operator Error. Valve Repositioned & Personnel Counseled ‎ (← links)
  • 05000281/LER-1984-014-01, :on 840821,while Replacing Relay PRB-XB, Auxiliary Feed Pump 2-FW-P-3B Started Upexpectedly.Caused by Incorrectly Positioned Jumper Installed to Prevent Unnecessary Relay Actuation.Jumper Reinstalled ‎ (← links)
  • 05000281/LER-1992-005-03, :on 920410,one Train of Intake Canal Level Sensing Channel 1 Discovered Out of Trip Position After Isolation Screenwell.Cause Not Determined.No Corrective Actions Necessary ‎ (← links)
  • 05000281/LER-1984-007, :on 840320,motor Operated Valve Breakers Found Open & Unlocked.Caused by Inadequate Review of Tech Specs. Locks Placed on Valve Breakers ‎ (← links)
  • 05000281/LER-1984-006, :on 840316,cooldown Rate Exceeded 50 F/Hr. Caused by Control Room Operators Failure to Recognize Increasing Cooldown Rate.Personnel Reinstructed & Operators Required to Read LER ‎ (← links)
  • 05000281/LER-1975-010-01, /01T:on 750624,svc Water Pump 2-SW-P-4B Developed Seal Leak.Caused by Electrical Short in Motor Operator.Pump Leak & Motor Operator Repaired ‎ (← links)
  • 05000281/LER-1975-011-01, /01T:on 750630,4 Kv Undervoltage Protection Inoperable.Caused by Blown Fuse.Fuses Replaced ‎ (← links)
  • 05000281/LER-1975-012-01, /01T:on 750706:main Steam Line Trip Valve in Steam Line B Closed,Causing Closure of Trip Valves a & C & Reactor Trip.Caused by Faulty Piston O-ring.O-ring Replaced & Air Lines Cleared of Debris ‎ (← links)
  • 05000281/LER-1975-013-01, /01T:on 750720,channel of Change Protection Found Not Conservative.Caused by Failure of Cold Leg Low Level Amplifier.Amplifier Replaced & Channel Calibr ‎ (← links)
  • 05000281/LER-1975-017-01, /01T:on 751003,loop C Leg RTD Failed Low,Causing Protection Signals to Fail Low.Caused by Incorrect Ohmic Characteristic of Connected RTD & Spare.Failed Instruments Replaced ‎ (← links)
  • 05000281/LER-1975-018-01, /01T:on 751009,steam Generator Level Transmitter Isolation Valve Body Bonnet Leak Wetted Down RPI Cabling, Causing Grounds & Erratic Indication for 24 Different Rods. Caused by Water Spray ‎ (← links)
  • 05000281/LER-1975-019-01, /01T:on 751015,boric Acid Transfer Pump D Motor Failed Resulting in Loss of Recircilation of Boron Injection Tank 2.Caused by Boric Acid Present in Stator Windings. Pump B Placed in Svc ‎ (← links)
  • 05000281/LER-1975-015-01, /01T:on 750807,boron Injection Tank Recirculation Valves TV-2884 A,B & C Found Closed.Caused by Air Supply Valve 2-IA-451 Partially Throttled Due to Vibration ‎ (← links)
  • 05000281/LER-1975-016-01, /01T:on 750823,low Level Alarm on Boric Acid Tank C Received.Caused by Installation of Carbon Steel Rather than Stainless Steel 304 Flanges & Pipe of Spool Piece.All Improper Installations Will Be Replaced ‎ (← links)
  • 05000281/LER-1975-020-01, /01T:on 751219,steam Generator C Pressure Indication 496 Channel IV Failed High.Caused by Frozen Sensing Line.Louvers Closed & Sealed Allowing Line to Thaw & Transmitter Returned to Normal Svc ‎ (← links)
  • 05000281/LER-1975-021-01, /01T:on 751219,channel 3 for Over Temp Indicated 132% While Channels 1 & 2 Indicated 118%.Cause Unknown. Channel Calibr & Returned to Svc ‎ (← links)
  • 05000281/LER-1976-010-03, /03L:on 760621,loss of Voltage Alarm Received on Power Range Nuclear Instrument Channel 42.Caused by Failure of 25-volt Power Supply.Power Supply Replaced & Channel Calibr ‎ (← links)
  • 05000281/LER-1976-011-03, /03L:on 760626,nuclear Instrumentation Sys Power Range Channel N42 Deviated from Channels N41,N43 & N44 by 3% in Nonconservative Direction.Caused by Low Output of Channel Level & Summing Amplifier ‎ (← links)
  • 05000281/LER-1976-012-03, /03L:on 760813,routine Sample of Safety Injection Accumulator C Indicated 1,893 Ppm Boron.Caused by Leaking Check Valves 2-SI-147 & 2-SI-145.During Refueling,Check Valves Will Be Inspected & Repaired ‎ (← links)
  • 05000281/LER-1976-013-03, /03L:on 760820,outside Isolation Valve 2-SI-73 in Accumulator Test Line Found Open.Caused by Inadequate Implementation of Administrative Controls.Valve Closed ‎ (← links)
  • 05000281/LER-1976-014-03, /03L:on 761013,discovered That Dual Comparator LC-2-485B Would Not Deenergize for Low Level Trip or Level Alarm.Caused by Open Capacitor.Comparator Replaced.W/ ‎ (← links)
  • 05000281/LER-1976-015-03, /03L:on 761006,leakage of Water Observed from Recirculation Spray HX a Piping.Caused by Cloride Stress Corrosion of Type 304 Stainless Steel Piping.Repairs Will Be Made Following Investigation ‎ (← links)
  • 05000281/LER-1976-016-03, /03L:on 761230,boron Injection Tank (Bit) Concentration Was 11.4% Weight.Caused by Leakage Through Bit Inlet Valves MOV-2867A & B.Boric Acid Batched to Storage Tank C Concentration to 11.9% ‎ (← links)
  • 05000281/LER-1976-009-99, /99T:on 760204,main Steam Line Trip Valve TV-MS-201A Failed to Closed When Operated from Control Room. Caused by Valve Disc Binding Against Valve Body.Disc Opening Adjusted ‎ (← links)
  • 05000281/LER-1976-002-01, /01T:on 760511,small Cracks & Radial Growth Observed on Periphery of Seventh Tube Support Plate.Caused by Change from Phosphate to Avt Chemistry.Further Investigation in Progress ‎ (← links)
  • 05000281/LER-1976-003-01, /01T:on 760521,routine Chemistry Analysis of Primary Coolant Boron Concentration Indicated Unplanned Dilution Occurred.Caused by Three Tubes Out on Steam Generator 2A.Tubes Plugged ‎ (← links)
  • 05000281/LER-1976-001-03, /03L:on 760217,channel III Overtemp Setpoint Drifted 9% in Nonconservative Direction.Caused by Outputs of Summator TM-2-432 High Even Though Inputs Were Correct. Summator Replaced ‎ (← links)
  • 05000281/LER-1976-002-03, /03L:on 760409,trip Valve TV-SS-201A Failed to Close When Operator Attempted to Close Valve from Control Panel.Vendor Contacted to Determine Cause.Valve Tested Satisfactorily W/O Prior Maint Activity ‎ (← links)
  • 05000281/LER-1976-003-03, /03L:on 760412,condenser Outlet Valve MOV-CW-200A Would Not Operate.Caused by Water in Limit Switch Compartment & Motor.Motor & Limit Switch Repaired & Limit Switch Compartment water-proofed ‎ (← links)
  • 05000281/LER-1976-004-03, /03L:on 760422,valve MOV-SW-202B Failed to Close When Cls Hi-Hi,Train B Signal Actuated During Testing.Caused by Corroded Contacts on Torque Switch.New Torque Switch Installed ‎ (← links)
  • 05000281/LER-1976-005-03, /03L:on 760427,overall Integrated Containment Leakage Rate Found Greater than Acceptable Criterion.Cause Under Investigation.Repairs Will Be Made Per Investigation Results ‎ (← links)
  • 05000281/LER-1976-006-03, /03L:on 760504,two of Three Pressurizer Level Transmitters Found to Have Out of Spec High Level Trip Setpoints.Caused by Normal Electronic Drift on LT-459 & 461. Transmitters Recalibr ‎ (← links)
  • 05000281/LER-1976-007-03, /03L:on 760607,refueling Water Chemical Addition Valve MOV-CS-202B Would Not Open Beyond mid-position Electrically.Caused by out-of-position Return Spring in Torque Switch.Switch Replaced ‎ (← links)
  • 05000281/LER-1976-008-03, /03L:on 760614,condenser Outlet Valve MOV-CW-200B Would Not Operate Electrically.Caused by Broken Off Valve Operator Worm Shaft Tripper Cam.Tripper Cam Replaced & Valve Tested & Returned to Svc ‎ (← links)
  • 05000281/LER-1976-009-03, /03L:on 760615,valve Operator MOV-2862B Would Not Operate When Cycled by Console Control Switch.Caused by Actuation of Thermal Overloads in Breaker housing.Three- Point Adjustment Screws Loosened ‎ (← links)
  • 05000281/LER-1976-004-01, /01T:on 760606,after Maint on Valve 1-CH-125,heat Tracing Circuits on Boric Acid Tank C Recirculation Line Not Placed Back Into Operation.Operating Procedure 1D Modified ‎ (← links)
  • 05000281/LER-1976-005-01, /01T:on 760915,pressurizer Level Fell 45% Below Level Set Point.Caused by Tube Leak in Steam Generator A. Steam Generator Isolated ‎ (← links)
  • 05000281/LER-1977-001-03, /03L:on 770118,recirculation Flow from Boric Acid Tank B Ceased.Caused by Broken Coupling Between Motor & Pump on Transfer Pump 1-CH-P-20.Coupling Repaired ‎ (← links)
  • 05000281/LER-1977-002-03, /03L:on 770126,ability to Maintain Recirculation Between Boric Acid Tank & Boron Injection Tank Lost.Caused by Obstruction in Line from Tank C to Transfer Pumps. Line Back Flushed ‎ (← links)
  • 05000281/LER-1977-003-03, /03L:on 770209,loop C Cold Protection Channel T-432 Failed.Caused by Malfunction of Span Potentiometer in Low Level Amplifier TM-2-432.Amplifier Replaced W/Shop Spare ‎ (← links)
  • 05000281/LER-1975-003-01, /01T:on 750131,steam Generator C Narrow Range Level Channel 2 Indication Found Drifted 65%.Caused by Magnetic Sludge Deposits in Sensing Lines.Channel Placed in Trip Mode & Detector Sensing Lines Blown Down ‎ (← links)
  • 05000281/LER-1975-004-01, /01T:on 750214,steam Generator C Narrow Range Level Channel 1 Indication Found Drifted High.Caused by Leaking Condensate Pot Isolation Valve Preventing Pot from Maintaining Proper Water Level ‎ (← links)
  • 05000281/LER-1975-005-01, /01T:on 750217,quadrant Tilt of Up to Max of 2.5% Existed for Greater than 2 H W/O Power Reduction.Caused by Card Failure.Actual Tilt Caused by Dropped Rod ‎ (← links)
  • 05000281/LER-1975-008-01, /01T:on 750427,accumulator Discharge Valve MOV-2865C Did Not Receive Signal to Open Upon Safety Injection Initiation.Caused by Disconnected Lead Blocking Signal ‎ (← links)
  • 05000281/LER-1975-006-01, /01T:on 750427,consequence Limiting Safeguard high-high Train B Would Not Initiate When 3/4 Matrix of Channels 1,2 & 3 Tripped.Cause Unknown.Relay R-LM100C2 Replaced ‎ (← links)
  • 05000281/LER-1975-007-01, /01T:on 750427,motor Operator to Valve MOV-CW-206D Failed to Operate.Caused by Mounting Screw of Torque Switch Not Fully Seated.Mounting Screw & Lock Washer Fully Set ‎ (← links)
  • 05000281/LER-1975-009-01, /01L:on 750613,above Ground Emergency Condensate Storage Tank Discovered W/Less than Required 60,000 Gallons of Water.Caused by Inconsistencies in Operating Procedure 31.2.Tank Filled ‎ (← links)
  • 05000281/LER-1984-010, :on 840418 & 19,reactor Trip Occurred as Result of Turbine Trip from High Level in Feedwater Heater 6A.Caused by Leaking Tube & Flow Blockage in Loop Seal.Tubes Plugged & Matl Removed from Loop Seal ‎ (← links)
  • 05000281/LER-1984-009-01, :on 840415,reactor Trip Occurred as Result of Intermediate Range High Flux Trip.Caused by Spike on Range Detector NI-35.Emergency & Function Restoration Procedures Performed ‎ (← links)
  • 05000281/LER-1984-012, :on 840420,reactor Tripped Due to High Flux on Source Range NI-32.Caused by Personnel Error.Personnel Counseled & Replacement Preamp Ordered ‎ (← links)
  • 05000281/LER-1983-060-03, /03L-0:on 831220,feeder Breaker for Heat Tracing Panel 2B1 Tripped.Caused by Ground Fault That Occurred When Ac Power Supply Fuse Blew.Fuse Replaced & Ground Fault Circuit for Feeder Breaker Removed ‎ (← links)
  • 05000281/LER-1984-005-01, :on 840316,reactor Trip Occurred as Result of Reactor Coolant Pump Trip.Caused by Water in Electrical Penetration for Motor Leads.Penetration Replaced W/Spare & Meggered & Type B Tested Satisfactorily ‎ (← links)
  • 05000281/LER-1984-008, :on 840323,4160-volt Motor Leads for RHR Pump Motors Improperly Electrically Insulated W/Heat Shrinkable Matl Rated for 1,000 Volts.Caused by Inadequate Maint Procedures.Insulation Replaced ‎ (← links)
  • 05000281/LER-1984-004, :on 840315,67 of 267 Snubbers Failed to Meet Acceptance Criteria Stipulated in Snubber Administrative Procedures.Snubber Program Being Revised to Provide Better Controls on Maint & Tracking of Snubbers ‎ (← links)
  • 05000281/LER-1983-057-03, /03L-0:on 831123,determined That Several Degraded Voltage & Undervoltage Relays for Emergency Buses 2J & 2H Set Low.Caused by Instrument Drift.Relays Reset ‎ (← links)
  • 05000281/LER-1983-056-03, /03L-0:on 831122,containment Spray Pump 2-CS-P-1A Motor Tripped Upon Start.Pump 2-CS-P-1B Subsequently Tripped Upon Start.Caused by Instantaneous Delay Trip Times Set Lower than 0.07 ‎ (← links)
  • 05000281/LER-1983-055-03, /03L-0:on 831118,motor Driven Auxiliary Feed Pump B 2-FW-P-3B Unable to Develop Flow & Declared Inoperable. Caused by Leaking Check Valves Allowing Hot Water to Seep Into Pump Casing & Bind Pumps ‎ (← links)
  • 05000281/LER-1983-054-03, /03L-0:on 831118,at Full Power,Emergency Diesel Output Breaker 3 Inadvertently Tagged Out.Caused by Personnel Error.Breaker 25J3 Racked In.Operator Disciplined ‎ (← links)
  • 05000281/LER-1983-053-03, /03L-0:on 831115,operability Check of Containment Vacuum Pump 2-CV-P-1A Revealed Pump Inoperable.Caused by Worn Impeller Sliding Vanes.Pump Replaced ‎ (← links)
  • 05000281/LER-1983-050-03, /03L-0:on 831027,w/unit at Full Power,Charging Pump Svc Water Pump 2-SW-P-10B Lost Sufficient Discharge Pressure.Caused by Clogged in-line Strainer.Fine Mesh in Strainer Removed ‎ (← links)
  • 05000281/LER-1983-051-03, /03L-0:on 831024,w/unit at 100% Power & Charging Pump Svc Water Pump 2-SW-P-10A Removed from Svc,Charging Pump Svc Water Pump 2-SW-P-10B Tripped.Caused by Thermal Overload.Overloads Replaced ‎ (← links)
  • 05000281/LER-1983-049-03, /03L-0:on 831011,w/unit at Full Power,Control Rod B-6 Dropped to Fully Inserted Position,Resulting in Quadrant Power Tilt Greater than Tech Specs.Caused by Failed Voltage Regulation Card.Card Replaced ‎ (← links)
  • 05000281/LER-1983-047-03, /03L-0:on 831005 & 23,w/unit at 100%,pump 2-RS-P-2A Tripped on Overload During Monthly Surveillance Tests,Contrary to Tech Spec 3.4.A.2.Caused by Instantaneous Trip Set Below Specs.Overload Setting Adjusted ‎ (← links)
  • 05000281/LER-1983-044-03, /03L-0:on 830929,operator Discovered Charging Svc Water Pump Discharge Valve 2-SW-P-10B Closed W/Pump in Auto Standby.Cause Not Determined.Valve Probably Closed While Const Activities in Progress.Valve Opened ‎ (← links)
  • 05000281/LER-1983-043-03, /03L-0:on 831008,Test 2.1B Revealed That Overtemp Delta T Comparator for Loop B Would Not Deenergize to Initiate One Channel of Reactor Trip Logic.Caused by Two Failed Capacitors.Comparator Replaced ‎ (← links)
  • 05000281/LER-1983-042-03, /03L-0:on 830930,rod Position Indication for Rod F-6 Observed More than 12 Steps Out of Alignment.Caused by Drift in Signal Conditioning Module.Module Recalibr ‎ (← links)
  • 05000281/LER-1983-040-03, /03L-0:on 830921,w/unit in Hot Shutdown,Resistance of Motor for Auxiliary Feed Pump 2-FW-P-3A Discovered Degraded,Rendering Pump Inoperable.Caused by Rainwater Leaking Through Safeguards Bldg Roof Onto Motor ‎ (← links)
  • 05000281/LER-1983-039-03, /03L-0:on 830926,w/unit at Hot Shutdown,Auxiliary Oil Pump for Charging Pump 2-CH-P-1A Observed Not Running. Cause Undetermined.Starting Coil Removed & Inspected.No Problems Found.Pump Performs as Designed ‎ (← links)
  • 05000281/LER-1983-038-03, /03L-0:on 830921,during RCS Integrity Test PT-11, Weld Leak Identified on Steam Generator a Channel Head Drain Piping at 2-RC-159.Cause Not Determined.Weld Completely Ground Out,Rewelded & Tested Satisfactorily ‎ (← links)
  • 05000281/LER-1983-041-03, /03L-0:on 830925,w/Unit 1 in Cold Shutdown & Unit 2 in Hot shutdown,MOV-CW-206C Breaker Discovered Open. Caused Personnel Placing Danger Hold Tag on Wrong Valve.Tag Removed.Breaker Closed ‎ (← links)
  • 05000281/LER-1984-003, :on 840114,while at 23% Power,Feed Flow to Steam Generator a Increased to Full Flow.Valve Opened & Steam Generator a High Level Trip Initiated Turbine Trip, Tripping Reactor.Caused by Air Supply Piping Damage ‎ (← links)
  • 05000281/LER-1984-002-01, :on 840114,at 2% Power Following 840113 Trip, During Replacement of Open Coil in Reactor Trip Relay, Reactor Trip Breaker a Deenergized When First Coil Lead Removed,Resulting in Reactor Trip.Caused by Personnel Error ‎ (← links)
  • 05000281/LER-1984-001-02, :on 840113,manual Trip Initiated Upon Closure of Main Steam Trip Valve A.Unwarranted Valve Closure Due to Hairline Crack in Air Line Pipe Nipple of Valve Actuator. Possibly Caused by Mechanical Fatigue.Nipple Replaced ‎ (← links)
  • 05000281/LER-1983-034-03, /03L-0:on 830813,w/unit at Constant Speed Drive, Periodic Snubber Functional Testing Revealed 23 Snubbers Failed to Meet Required Acceptance Criteria.Caused by Seal Degradation & Scored Piston/Body ‎ (← links)
  • 05000281/LER-1983-058-03, /03L-0:on 831228 & 29,rod Position Indicators (Rpi),Indicated More than 12 Steps from Bank.Caused by Signal Conditioning Module Drift.Both RPIs Tested & Returned to Svc ‎ (← links)
  • 05000281/LER-1983-031-03, /03L-0:on 830622,independent Rod Position Indication for Control Rod K-2 Fluctuated Greater than 12 Steps.Cause Undetermined.Signal Conditioner Module Voltage Adjusted & Fluctuations Ceased ‎ (← links)
  • 05000281/LER-1983-032-03, /03T-0:on 830811,insp of Steam Generator a Feedring Revealed Holes in Seven J-tubes.Caused by Erosion/ Corrosion Phenomenon.Tubes Replaced W/Inconnel Tubes ‎ (← links)
  • 05000281/LER-1980-005-01, Type a Testing Revealed Leakage Through Recirculation Spray Diaphragm Plate Seal Welds.Caused by Lack of Fusion & Slag Inclusion in Weld Areas.Defects Repaired ‎ (← links)
  • 05000281/LER-1983-019-03, /03L-0:on 830415,MOV-LCV-2115D Failed to Open During Performance of PT18.6.Caused by Motor Leads Not Making Contact Due to Loose Plug in Terminal Strip in Motor Control Ctr.Terminal Strip Properly Seated ‎ (← links)
  • 05000281/LER-1983-018-03, /03L-0:on 830406,at 100% Power,Control Rod B-6 Dropped to Fully Inserted Position Causing Quadrant Power Tilt or Turbine Runback.Cause Unknown.Fuses & Other Components Operable.Control Rod Withdrawn ‎ (← links)
  • 05000281/LER-1983-017-03, /03L-0:on 830408,at 100% Power,Amp Readings for Heat Tracing Panels 8 & 9,circuit 20B Discovered Below Acceptable Limits.Caused by Excessive Heat.Defective Heat Tracing Replaced.Design Changes Implemented ‎ (← links)
  • 05000281/LER-1983-012-03, /03L-0:on 830309,performance of PT-27B Revealed Ampere Reading Less than Acceptance Criteria for Heat Tracing Circuits 6A,panel 11 & 21A & Panels 8 & 9.Caused by Heat in Damaged Circuits 6A & 21A ‎ (← links)
  • 05000281/LER-1983-009-03, /03L-0:on 830308,during Routine Walkdown,Breaker for Heat Tracing Circuit 2 Panel 9 Found Tripped.Caused by Section of Circuit 2 Being Wired Incorrectly.Wiring Problem Corrected ‎ (← links)
  • 05000281/LER-1983-027-03, /03L-0:on 830523,PT-27C Revealed That Amp Reading for Heat Tracing Panel 8,circuit 22A Below Tech Spec Limit. Caused by Excessive Heat.Heat Tracing Replaced.Design Change initiated.W/830620 ‎ (← links)
  • 05000281/LER-1983-008-03, /03L-0:on 830217,boric Acid Transfer Pump 1-CH-P-2 Declared Inoperable Due to Low Discharge Pressure.Caused by Change in Clearance Between Impeller Vanes & Casing Wall. Pump Adjusted ‎ (← links)
  • 05000281/LER-1983-007-03, /03L-0:on 830217,operators Discovered Heat Tracing Panels 8 & 9 Circuit 2 & 13 Tagged Out & de-energized.Caused by Operator Improperly Performing Tagout Procedure.Circuits Energized & Verified Operable ‎ (← links)
  • 05000281/LER-1983-024-03, /03L-0:on 830517,PT-27D Revealed That Ampere Readings for Heat Tracing Panel 8,Circuit 13C Below Acceptance Criteria in PT-27D.Caused by Excessive Heat. Defective Heat Tracing Replaced ‎ (← links)
  • 05000281/LER-1983-023-03, /03L-0:on 830511,PT 27B Revealed Amp Readings for Heat Tracing Panel 9,circuit 28A,below Acceptance Criteria. Caused by Boric Acid Buildup on Heat Tape,Corroding Terminals & Resulting in Open Circuit.Heat Tracing Replaced ‎ (← links)
  • 05000281/LER-1983-022-03, /03L-0:on 830430,PT-27 Revealed Amp Readings for Heat Tracing Panel 8,circuits 5A & 22A,below Acceptance Criteria.Caused by Excessive Heat.Defective Heat Tracing Replaced & Tested.Design Change Prepared ‎ (← links)
  • 05000281/LER-1983-004-03, /03L-0:on 830204,w/unit at 100% Power,Amp Reading for Panel 9,circuit 20C Below Tech Spec Limits,Due to Failure of Heat Tracing Circuit.Caused by Open Thermostat. Thermostat Replaced & Heat Tracing Circuit Returned to Svc ‎ (← links)
  • 05000281/LER-1983-003-03, /03L-0:on 830202,w/unit at 100% Power & Emergency Diesel Generator 3 Out of Svc for Maint,Containment Vacuum pump,2-CV-P-1A,failed to Develop Flow.Caused by Binding of Sliding Vanes in Pump Rotor.Pump Replaced W/Shop Spare ‎ (← links)
  • 05000281/LER-1981-074-03, Higher than Normal Activity Detected in Storm Drain Sys.Caused by Leaks from Stripper Feed Steam Heater Due to Failure of Heater Drain Receiver & Pumps to Prevent Overflow.Tubes Plugged ‎ (← links)
  • 05000281/LER-1981-052-03, Valve MOV-SW-202A Failed to Close Due to Grounded Motor.Grounding Caused by Flooding in Sump.Motor Replaced ‎ (← links)
  • 05000281/LER-1983-001-03, /03L-0:on 830118,amp Readings for Heat Tracing Panel 8,circuit 13B,fell Below Acceptance Criteria.Caused by Excessive Heat.Defective Heat Tracing Replaced & Tested. Design Change Prepared ‎ (← links)
  • 05000281/LER-1982-076-03, /03L-0:on 821217,discovered B Train of Auxiliary Feedwater Motor Operated Valves Not Opening on Steam Generator low-low Level.Caused by Incomplete Wiring for Design Change 76-69 ‎ (← links)
  • 05000281/LER-1982-067-03, /03L-0:on 821109,w/unit at Full Power,Electrical Fire Barrier Penetration Found Improperly Sealed.Cause Unknown.Fire Watch Established & Penetration Temporarily Sealed.Permanent Sealing to Be Completed by 830101 ‎ (← links)
  • 05000281/LER-1982-068-03, /03L-0:on 821112,during Performance of PT 18.6B, TV-CC-209B Would Not Close When Manually Operated from Control Room.Caused by Sticking Pilot Valve That Controls Air Flow from Valve Actuator.Pilot Valve Replaced ‎ (← links)
  • 05000281/LER-1982-069-03, /03L-0:on 821104,charging Pump Svc Water Pump 2-SW-P-10B Experienced Loss of Suction Pressure.Caused by Insufficient Npsh.Pump Vented to Restore NPSH ‎ (← links)
  • 05000281/LER-1982-065-03, /03L-0:on 821106,charging Pump Svc Water Pump 2-SW-P-10A Failed to Develop Sufficient Discharge Pressure. Caused by Corroded Carbon Steel Stud on Packing Gland Housing & Lack of Npsh.Packing Matl & Studs Replaced ‎ (← links)
  • 05000281/LER-1983-011-03, /03L-0:on 830310,turbine Driven Auxiliary Feedwater Pump 2-FW-P-2 Failed to Maintain Required Speed During Performance of Monthly Surveillance Test.Caused by Speed Control Sys Missing Set Screw & Broken Taper Pin ‎ (← links)
  • 05000281/LER-1983-010-03, /03L-0:on 830304,during High Energy Walkdown,Insp of Snubber 2-SHP-HSS-32 (Main Steam Line in Safeguards) Found That Oil Level Not Visible in Sight Glass.Caused by Loose Packing Nut.Snubber Replaced ‎ (← links)
  • 05000281/LER-1983-013-03, /03L-0:on 830323,ampere Readings for Heat Tracing Panel 8,circuit 2B Was Below Acceptance Criteria.Caused by Butt Splice Failure.Defective Butt Splice Replaced & Circuit Tested Satisfactorily ‎ (← links)
  • 05000281/LER-1982-008-03, /03L-0:on 820118,fault Occurred on Feeder Cables to B Reserve Station Svc Transformer.Isolation of Fault de-energized Emergency Bus.Caused by Flashover to Ground & to Adjacent Phase Due to Spraying of Insulators ‎ (← links)
  • 05000281/LER-1982-007-03, /03L-0:on 820118,periodic Test 10 Revealed Unidentified Leak Rate Greater than 1 Gallon Per Minute. Caused by Inlet Flange Leak on Relief Valve.Flange Gasket Replaced ‎ (← links)
  • 05000281/LER-1983-006-03, /03L-0:on 830214,during Full Power,Trip Valve TV-DA-200B Failed to Close When Containment Sump Pump Stopped.Caused by Defective solenoid-operated Valve.Valve Replaced ‎ (← links)
  • 05000281/LER-1983-005-03, /03L-0:on 830211,during Full Power Test PT-15.1C, Turbine Driven Auxiliary Feed Pump Ran Intermittently.Caused by Corrosion Piston of Pump Governor Regulator.Piston Cleaned ‎ (← links)
  • 05000281/LER-1990-005-03, :on 901120,rod Control Cluster Assembly M-12 Declared Inoperable Due to Mismatch Between Group & Rod Position Indication.Caused by Control Rod Positioned Two Steps from Bottom of Core ‎ (← links)
  • 05000281/LER-1982-056-03, /03L-0:on 820907,pressure in Nitrogen Bottle Supplying Emergency Air to PCV-MS-202A & B Discovered Below Limit.Caused by Leaking Nitrogen Bottle Connection. Replacement Bottle Correctly Installed ‎ (← links)
  • 05000281/LER-1982-074-03, /03L-0:on 821211,w/unit in Cold Shutdown,Pt 39B-2 Revealed 2-RC-HSS-162 & 163 & 2-RH-HSS-5 Snubbers Had Low Levels in Reservoirs.Caused by Leak in Reservoir Sight Glass & on Pipe Fitting to Valve Block ‎ (← links)
  • 05000281/LER-1982-073-03, /03L-0:on 821207 & 24,FI-474 Drifted Low. Caused by Partial Loss of Fluid in Sensing Line to High Side of Transmitter.Valve Repaired & Sensing Line Filled ‎ (← links)
  • 05000281/LER-1978-011, Forwards LER 78-011/03X-1 ‎ (← links)
  • 05000281/LER-1981-042-03, /03L-0:on 810719,containment Spray Chemical Addition Tank (Cat) Level Found Below Tech Specs.Caused by Leaking Valve MOV-CS-202B.Valve Scheduled for Repair During Next Outage.Tank Level Restored ‎ (← links)
  • 05000281/LER-1981-075-03, /03L-0:on 811108,main Steam Trip Valve for B Steam Generator Would Not Respond to Train a Consequence Limiting Safeguards Actuation.Cause Not Positively Identified,But SOV Suspected.Sov to Be Replaced ‎ (← links)
  • 05000281/LER-1980-010-01, Containment Gaseous & Particulate Radiation Monitor Found to Have One Automatic Function Incapable of Operating During Fuel Movement.Caused by Bypass of Containment Exhaust Fan Relay in Design Change ‎ (← links)
  • 05000281/LER-1982-046-03, /03L-0:on 820715,periodic Test 2.9 Revealed That High Steam Flow Trip Setpoint for Steam Generator B Comparator FC-2-485 Was High & Could Not Be Adjusted.Caused by Malfunctioning Comparator.Comparator Replaced ‎ (← links)
  • 05000281/LER-1982-040-03, /03L-0:on 820703,containment Spray Chemical Addition Tank Level Found to Be 5% Below Tech Spec Requirement.Cause Resulted from Minor Leaks Through One or Both Isolation Valves.Tank Level Restored ‎ (← links)
  • 05000281/LER-1982-037-03, /03L-0:on 820615,charging Pump Svc Water Pump 2-SW-P-10A Had Zero Discharge Pressure Due to Loss of Suction.Caused by Insufficient NPSH for Charging Pump Svc. Chiller Svc Water Throttled to Provide NPSH ‎ (← links)
  • 05000281/LER-1982-023-03, /03L-0:on 820420 W/Boric Acid Transfer Pump 1-CH-P-2D Tagged for Maint,Boron Injection Tank Recirculation Lost Due to Failure of 1-CH-P-2C.Caused by Reversal of Slow Speed Motor Leads.Pump Repaired ‎ (← links)
  • 05000281/LER-1982-013-03, /03L-0:on 820124,radioiodine Sample Taken 6-h & 28 Minutes Following Thermal Power Increase,Exceeded Tech Spec Time Limit.Caused by Delayed Oncoming Shift Chemists Due to Traffic Problems ‎ (← links)
  • 05000281/LER-1982-013, Forwards LER 82-013/03L-0 ‎ (← links)
  • 05000281/LER-1982-001-03, /03L-0:on 820105,loss of Accurate Control of Boric Acid Concentrations of Unit 2 Bit & C Bast Occurred on 820105,08,15 & 18.Caused by Inleakage to Bit Via MOV-2867 A&B.Boron Concentration Returned to Tech Spec Limit ‎ (← links)
  • 05000281/LER-1982-001, Forwards LER 82-001/03L-0 ‎ (← links)
  • 05000281/LER-1982-004-03, /03L-0:on 820112,at 85% Power,Boron Injection Tank Recirculation Lost Due to Failure of Pump 1-CH-P-2D Leaving Only Two Boric Acid Transfer Pumps Serviceable.Caused by Failure of Mechanical Seal.Pump Repaired ‎ (← links)
  • 05000281/LER-1982-004, Forwards LER 82-004/03L-0 ‎ (← links)
  • 05000281/LER-1982-003-03, /03L-0:on 820108,PT-27 Revealed Ampere Readings for Heat Tracing Panel 10 Circuits 1B,2A & 5B & Panel 11 Circuit 2A,4C & 5B Found Below Acceptance Criteria.Caused by Excessive Heat.Defective Heat Tracing Replaced & Tested ‎ (← links)
  • 05000281/LER-1981-083-03, /03L-0:on 811231,steam Flow Instruments FI-474 on a Main Stream Line & FI-485 on B Main Stream Line Found Isolated.Caused by Instruments Inadvertently Left Isolated Until Discovery During Startup ‎ (← links)
  • 05000281/LER-1981-081-03, /03L-0:on 811229,containment Isolation Valve, 2-VA-1,found Unlocked,Open & Unattended.Caused by Supervisor Failing to Recognize That Valve Had Been Opened to Allow Venting of C Loop.Valve Closed & Locked ‎ (← links)
  • 05000281/LER-1981-076-03, /03L-0:on 811108,recirculation Spray Heat Exchangers Svc Water Valve MOV-SW-203C Failed in Intermediate Position.Cause Not Determined.Valve Inspected Mechanically & Electrically ‎ (← links)
  • 05000281/LER-1981-071-03, /03L-0:on 811107,setpoints of 2 Main Steam Safety Valves Not within Plus or Minus 3% of Required Value.Caused by Normal Setpoint Drift.Setpoints Adjusted ‎ (← links)
  • 05000281/LER-1981-064-03, /03L-0:on 811008,during Charging Pump Svc Water Surveillance testing,2-SW-P-10B Failed to Develop Required Discharge Pressure & Was Declared Inoperable.Caused by Loss of Npsh.Svc Water Flow Adjusted & Pump Vented ‎ (← links)
  • 05000281/LER-1981-063-03, /03L-0:on 811014,vol of Borated Water in Safety Injection Accumulator B Exceeded Tech Spec.Caused by Personnel Error.Operator Filling Accumulator Was Slow Terminating Makeup.Vol Brought within Limits ‎ (← links)
  • 05000281/LER-2019-002, Auxiliary Feedwater System Loss of Safety Function Due to Check Valve Failure to Close ‎ (← links)
  • 05000281/LER-1982-075-01, /01T-0:on 821219,while Conducting RCS Integrity Test,Weld Leak on Steam Generator a Channel Head Drain Piping at 2-RC-159 Identified.Probably Caused by Poor Fusion Between Successive Passes in Weld.Defective Weld Repaired ‎ (← links)
  • 05000281/LER-1982-075, Forwards LER 82-075/01T-0 ‎ (← links)
  • 05000281/LER-1982-052-03, /03L-0:on 820812,charging Pump Lubricating Oil Cooler 2-CH-E-5C Found to Be Losing Svc Water Flow, Increasing Bearing Temps on 2-CH-P-1C.Caused by Sticking Float in Svc Water Flow Indicator.Sticking Float Freed ‎ (← links)
  • 05000281/LER-1982-052, Forwards LER 82-052/03L-0 ‎ (← links)
  • 05000281/LER-1982-051-03, /03L-0:on 820816,at 100% Power,Heat Tracing Circuit 23C on Panel 8 Found Below Criteria.Cause of Loss Unknown.Defective Heat Tracing Replaced & Tested.Design Change Implemented ‎ (← links)
  • 05000281/LER-1982-047-03, /03L-0:on 820812,while at 100% Power,During Performance of PT 18.6B,trip Valve TV-CC-209B Would Not Close When Manually Operated.Caused by Sticking Pilot Valve. Air Supply to Pilot Valve Disconnected ‎ (← links)
  • 05000281/LER-1983-028-03, /03L-0:on 830523,ampere Reading for Heat Tracing Panel 8,circuit 23C,found Below Acceptance Criteria of PT-27C.Caused by Excessive Heat.Defective Heat Tracing Replaced.Design Change Installation Commenced ‎ (← links)
  • 05000281/LER-1983-015-03, /03L-0:on 830402,PT-27A Revealed That Amp Readings for Heat Tracing Panel 10 Circuit 1B & Panel 11 Circuits 2A, 4A & 6B Below Acceptance Criteria.Caused by Excessive Heat. Defective Heat Tracing Replaced & Design Change Init ‎ (← links)
  • 05000281/LER-1983-016-03, /03L-0:on 830329,signal from B Steam Line Pressure Transmitter PT-2-485 Increased Approx 300 Mv,Rendering Transmitter Inoperable.Cause Not Determined.Basis Adjusted & Transmitter Calibr & Returned to Svc ‎ (← links)
  • 05000281/LER-1981-056-03, /03L-0:on 810902,RCS Cold Leg Sample Valve Opened W/O Operator Action & Would Not Stay Closed.Caused by Failure of seal-in Limit Switch in Valve Operator.Lock Nuts Became Loose Due to Vibration & Valve Usage ‎ (← links)
  • 05000281/LER-1981-056, Forwards LER 81-056/03L-0 ‎ (← links)
  • 05000281/LER-1981-059-03, /03L-0:on 810819,while at 100% Power,Smoke Detector Sys Trouble Alarm Noted.Smoke Detector Panel Lost Power.Caused by Faulty Power Supply Card in Battery Charger.Card Replaced & Sys Returned to Svc 810825 ‎ (← links)
  • 05000281/LER-1981-055-03, /03L-0:on 810820,while at 100% Power,Both Charging Pump Svc Water Pumps Failed.Caused by Failure of High Carbon Steel Cap Screw for Impeller on Pump 2-SW-P-10B. Pump,Bearings & Screw Replaced ‎ (← links)
  • 05000281/LER-1981-041-03, /03L-0:on 810626,discovered That Recirculation Spray HX Svc Water Radiation Monitoring Pump Would Not Operate.Caused by Hardened Sediment on Pump Internals Which Prevented Pump from Rotating.Pump Cleaned & Adjusted ‎ (← links)
  • 05000281/LER-1981-040-03, /03L-0:on 810626,boric Acid Storage Tank a Overflowed Into Boric Acid Storage Tank C,Diluting Tank C Below Tech Spec Limits.Caused by Inadvertent Alignment of Primary Grade Water to Suction of Boric Acid Transfer Pump ‎ (← links)
  • 05000281/LER-1981-039-03, /03L-0:on 810623,periodic Testing Disclosed RWST Chloride Concentration Exceeded Limits.Caused by Leakage Through MOV-CS-202A & B from Chemical Addition Tank. MOV-CS-202B Isolated.Sensitized Piping Flushes Performed ‎ (← links)
  • 05000281/LER-1981-039, Forwards LER 81-039/03L-0 ‎ (← links)
  • 05000281/LER-1981-043-03, /03L-0:on 810617,in Preparation for Flushing of Sensitized Pipe,Valve 2-SI-73 Was Discovered Open.Cause Unknown.Valve Closed & Locked ‎ (← links)
  • 05000281/LER-1981-037-03, /03L-0:on 810608,NaOH Concentration of Cat Exceeded Tech Spec Limits.Cause Not Stated.Concentration Diluted & Personnel Will Be Reinstructed ‎ (← links)
  • 05000281/LER-1981-035-03, /03L-0:on 810529,fuel Oil Transfer Pump 1B Suction valve,1-EE-14,was Found Closed.Caused by Personnel Error. Valve Opened ‎ (← links)
  • 05000281/LER-1981-034-03, /03L-0:on 810601,svc Water Pump 2-SW-P-10B Was Found W/Insufficient Suction Pressure.Caused by Clogged Strainer Upstream of Pump.Strainer Bypass Opened ‎ (← links)
  • 05000281/LER-1981-033-03, /03L-0:on 810528,water Was Found in Fuel Oil Storage Tank 1-EE-TK-2A.Caused by Inadequate Procedures for Removing Water from Above Ground Tanks & Preventing Entry Into Underground Tanks.Water Drained ‎ (← links)
  • 05000281/LER-1981-032-03, /03L-0:on 810513,radiation Alarm Setpoint for Component Cooling Sys Was Found Greater than Twice Background.Caused by Decrease in Background & Instrument Drift.Monitor RM-CC-106 Reset ‎ (← links)
  • 05000281/LER-1981-032, Forwards LER 81-032/03L-0 ‎ (← links)
  • 05000281/LER-1981-014-03, /03L-0:on 810212,RM-CC-106 Alarm Setpoint Found Outside Tech Spec.Caused by Personnel Error.Setpoints Reset ‎ (← links)
  • 05000281/LER-1980-041-03, /03L-0:on 801112,snubber 2-WFPD-HSS-18 Found to Have Bent rod-eye & Was Declared Inoperable.Caused by Improper Alignment of Pipe Clamp to Snubber.Snubber Replaced ‎ (← links)
  • 05000281/LER-2019-001, Re Foreign Material in Breaker Contact Causes Pressurizer Power Operated Relief Valve Block Valve Inoperability ‎ (← links)
  • 05000281/LER-1993-002-03, :on 930620,automatic Trip Occurred Due to Low SG Water Level Coincident W/Steam/Feedwater Flow Mismatch Resulting from Main FW Pump Trip.Cr Operators Promptly Initiated Appropriate EOPs ‎ (← links)
  • 05000281/LER-1993-001-03, :on 930420,RHR Rendered Inoperable When CC Sys Flow Heat Exchanger Inadvertently Isolated.Caused by Cognitive Personnel Error.Evaluation of Decay Heat Removal Sys Configuration Will Be Performed ‎ (← links)
  • 05000281/LER-1992-008-03, :on 921215,RCS Leak Identified Near Low Pressure Letdown Flow Transmitter.Caused by Failure of Swagelock Fitting on Flow Transmitter.Root Cause Evaluation in Progress & Fitting & Tube Replaced ‎ (← links)
  • 05000281/LER-1992-010-02, :on 920917,TDAFWA Pump Automatically Started Due to Relay Failure in Station Svc UV Portion of AFW Start Circuit.Failed Agastat Relay Being Analyzed to Determine Cause.Relay Replaced & Satisfactorily Tested ‎ (← links)
  • 05000281/LER-1992-009-02, :on 920713,automatic ESF Actuation Signal Occurred,Causing Auxiliary Feedwater Sys motor-operated Valves to Receive Open Signal.Caused by Failure of 25A9 Breaker to Trip.Svc Water Leak Isolated ‎ (← links)
  • 05000281/LER-1992-007-02, :on 920615,portion of AFW Sys Full Flow Recirculation Line Was Uncovered During Excavation Work. Caused by Personnel Error.Soil Promptly Replaced Restoring Missile Protection Qualification of Line ‎ (← links)
  • 05000281/LER-1991-010-01, :on 911031,determined That Damage to C Main Steam Trip Valve Bypass Valve 2-MS-155,rendered Valve Incapable of Immediate Closure.Valve 2-MS-155 Replaced & Failure Evaluation Will Be Performed ‎ (← links)
  • 05000281/LER-1992-003-03, :on 920325,main Cr/Emergency Switchgear Room Chiller Was Declared Inoperable Due to High Svc Water Differential Pressure & Inoperable Emergency Power Source. Svc Water Differential Pressure Restored ‎ (← links)
  • 05000281/LER-1992-004-02, :on 920326,B Chiller Became Inoperable Due to Hand Operated Rocker Switch Inadvertently Being Placed in Off Position.Chiller Returned to Svc.Upgrade to Sys Will Include Installation of Two Chillers ‎ (← links)
  • 05000281/LER-1992-002-03, :on 920227,two Charging Pumps & One Charging Pump Svc Water Pump Removed from Svc Simultaneously.Caused by Congnitive Personnel Error.Senior Reactor Operator Disciplined & Pump Returned to Svc ‎ (← links)
  • 05000281/LER-1992-001-03, :on 920130,charging Pump 2-CH-P-1A Declared Inoperable Due to Oil Leak & Ventilation Damper for Charging Pump B Cubicle Failed to Open.Caused by Mechanical Failure/Personnel Error.Pump Repaired ‎ (← links)
  • 05000281/LER-1991-014, :on 910724,determined That Scaling for Main Steam Flow Transmitters Incorrect,Resulting in Setpoints in Excess of Max Allowed Value of 110%.Caused by Use of Incorrect Methodology.Scaling Program Underway ‎ (← links)
  • 05000281/LER-1991-011-03, :on 911217,automatic Reactor Trip Occurred as Result of Turbine Trip Due to High SG Level.Caused by Failure of B Main FW Regulating Valve to Maintain Demand Position.Valve Inspected,Replaced & Tested ‎ (← links)
  • 05000281/LER-1991-010-03, :on 911031,determined That Damage to C Main Steam Trip Valve/Bypass Valve 2-MS-155 Rendered Valve Incapable of Immediate Closure.Caused by Failure of Yolk Bushing Threads in Valve.Valve Closed ‎ (← links)
  • 05000281/LER-1991-007, :on 910802,safety Injection/Reactor Trip Occurred.Caused by Intermittent Loss of Voltage to Channel Iva Protection Instrumentation.Channel Iva Instrumentation Stabilized ‎ (← links)
  • 05000281/LER-1991-009-02, :on 910903,determined That Check Valve 2-RH-47 Not Full Flow Tested During Cycle 10 Refueling Outage.Caused by Personnel/Procedural Error.Procedure Changed & Testing Performed on 910908 ‎ (← links)
  • 05000281/LER-1991-008-02, :on 910814,charging Pump Component Cooling Pump a Tagged Out to Replace Pump Discharge Check Valve & Exceeded 24 H Lco.Caused by Unanticipated Delays During Maint.Engineering Evaluation Performed ‎ (← links)
  • 05000281/LER-1991-007-02, :on 910802,ESF Actuated & Safety Injection & Reactor Trip Occurred as Result of High Steam Flow Signal Coincident W/Low Steam Line Pressure Signal.Caused by Loss of Voltage to Protection Instrumentation ‎ (← links)
  • 05000281/LER-1991-006-02, :on 910719,safety Injection Sys Interlock Rendered Inoperable & Unit Not Placed in Shutdown within Six H Due to Personnel Error.Failed Amplifier Circuit Board & Calibr Circuit Board Replaced ‎ (← links)
  • 05000281/LER-1991-005-02, :on 910602,reactor Coolant Sys Leakage Exceeded Tech Spec Limits.Caused by Mechanical Failure of Isolation Valve.Preparation of Design Change Has Been Underway That Will Install RTDs on Main RCS Lines ‎ (← links)
  • 05000281/LER-1991-004-02, :on 910514,inadvertent Overfilling of Refueling Water Storage Tank Occurred.Cause Unknown.Architect/Engineer Consulted to Review Tank Design ‎ (← links)
  • 05000281/LER-1991-003-02, :on 910424,pressurizer Safety Valves Found to Have Lift Setpoints Lower than Min Due to Minor Damage/Wear. Valves Refurbished,Reset & re-installed ‎ (← links)
  • 05000281/LER-1991-002-01, :on 910326,main Stream Safety Valves Out of Tolerance.Caused by Minor Setpoint Drift.Affective Valve Adjusted & Valve Tested to Verify Setpoint to Be within Required Tolerance ‎ (← links)
  • 05000281/LER-1991-001-02, :on 910307,block Valves Declared Inoperable Until Required Surveillance Testing Satisfactorily Complete. Caused by Personnel Error.Task Team Formed to Address Missed Surveillance & Other Recent Similiar Events ‎ (← links)
  • 05000281/LER-1990-004-01, :on 900827,main Feedwater Regulating Valve Closed Following Inadvertent Grounding of Control Signal. Root Cause Not Determined.Computer Multiplexer Testing Procedures Changed ‎ (← links)
  • 05000281/LER-1989-019, :on 891122,noted That Flood Protection Dikes Removed from One Side of Valve Pits for Svc Water Supply motor-operated Valves to Recirculation Spray Hxs.Caused by Personnel Error.Flood Dikes Reinstalled ‎ (← links)
  • 05000281/LER-1990-003-02, :on 900531,reactor Trip Initiated When Malfunction of Main Feedwater Regulating Valve a Positioner Caused Valve to Close.Caused by Buildup of Dirt on Positioner.Positioner Replaced & Data Reviewed ‎ (← links)
  • 05000281/LER-1990-002-01, :on 900205,two Control Rods of Control Bank D Differed from Rod Group Demand Counter by Greater than 12 Steps.Caused by Inadequate Procedures.Rampdown Stopped & Individual Rod Position Indicators Adjusted ‎ (← links)
  • 05000281/LER-1990-001-01, :on 900108,one of Three RCS Average Temp Channel Inputs to Reactor Protection Sys Not Declared Inoperable After Deviating from Other Two Channels.Caused by Faulty Summator.Summator Replaced ‎ (← links)
  • 05000281/LER-1989-018-02, :on 891225,alarm Activated on Containment Manipulator Crane Radiation Monitor During Periodic Test, Resulting in Unplanned ESF Actuation.Caused by Operator Error.Caution Added to Periodic Test ‎ (← links)
  • 05000281/LER-1988-002, :on 880202,determined That Individual Valve Leakage Through Reactor Coolant Cold Leg Sample Isolation Valves Was Greater than ASME Section XI Spec.Caused by Impurities in Sys.Valves Replaced ‎ (← links)
  • 05000281/LER-1988-001, :on 880127,discovered That Leakage Through Containment Isolation Valves TV-SS-201A & TV-SS-201B Greater than ASME Section XI Spec.On 880202,wrong Leads Lifted for Trip Valves.Caused by Impurities in Sys ‎ (← links)
  • 05000281/LER-1989-019-01, :on 891122,discovered That Flood Protection Dikes Removed from One Side of Valve Pits for Svc Water Supply motor-operated Valves.Caused by Personnel Error.Flood Dikes Reinstalled ‎ (← links)
  • 05000281/LER-1989-014-02, :on 891117,results of Containment Purge Leak Test Indicated That Containment Purge Supply Penetration Exceeded 10CFR50,App J Leakage Value.Caused by Worn Rubber Seating Matl.Seat Replaced & Surface Cleaned ‎ (← links)
  • 05000281/LER-1989-016-02, :on 891030,main Feedwater Regulating Valve Bypass Valve Closed & Main Feedwater Pump Breakers Tripped Open.Caused by Personnel Error & Procedure Deficiency. Feedwater Control Reset & Components Aligned ‎ (← links)
  • 05000281/LER-1989-017-01, :on 891106,pressurizer Safety Valve C Lifted Below Tech Spec Limit.Cause Not Stated.Valve Reset to Required Lift Setpoints W/Steam & Reinstalled W/Loop Seal. Emergency Tech Spec Change Approved by NRC ‎ (← links)
  • 05000281/LER-1989-015-02, :on 891025,slow Boron Dilution of RCS Occurred W/O Containment Integrity.Caused by Misinterpretation of Tech Spec by Senior Reactor Operator Involved.Blender Properly Set Up Using Nomographs ‎ (← links)
  • 05000281/LER-1989-013-02, :on 891017,tests Determined That Required Lift Setpoints of 2485 +/- 1% Exceeded on All Tested Valves. Caused by Incorrect Setting of Valve Setpoints.Settings Adjusted to Proper Setpoint & Tolerance ‎ (← links)
  • 05000281/LER-1989-011-02, :on 890919,found That Pipe Support Rigidly Attached to Auxiliary Bldg Structure & Facility Containment Which Violates Design Requirements.Caused by Design Error. Pipe Support Modified ‎ (← links)
  • 05000281/LER-1989-012-02, :on 890919,discovered That Two Individual Rod Position Indicators in Control Bank A,Group 2 Had Differed in Indicated Position.Caused by Inadequate Method Used to Log Accumulated Times.Procedures Modified ‎ (← links)
  • 05000281/LER-1989-005-01, :on 890908,during Performance of Periodic Test on Turbine Bldg Flood Control Circuitry,Two of Four Condenser Waterbox Circulating Water Inlet Isolation Valves Closed Unexpectedly ‎ (← links)
  • 05000281/LER-1989-006-01, :on 890911,containment Particulate Radiation Monitor Indication Increased Above Alarm Setpoint.Caused by High Detector Reading Due to Containment Pressure Reduction. Alarm Reset & Suction Valves Realigned ‎ (← links)
  • 05000281/LER-1989-009-02, :on 890918,generator Backup Differential Lockout Relay 86 Tripped Turbine,Initiating Reactor Trip. Caused by Spurious Actuation of Impedance Relay KD-41.Unit Stabilized Following Trip ‎ (← links)
  • 05000281/LER-1989-007-03, :on 890916,manual Reactor Trip Initiated When Determined That Improper Bank Overlap Existed Between Control Rod Banks a & B.Cause Not Found.Reactor Restarted After Review by Safety & Operating Committee ‎ (← links)
  • 05000281/LER-1989-010-02, :on 890919,automatic Reactor Trip Generated as Result of lo-lo Steam Generator Level.Caused by Operator Raising Governor Valve Position Limiter More Rapidly than Desired.Lesson Learned Given to Personnel ‎ (← links)
  • 05000281/LER-1989-008-03, :on 890916,noted That Position Indicating Lights for Containment Instrument Air Outside Trip Valve Not Lit & Trip Valve Failed to Closed Position.Caused by Loose Fuse in Control Power Circuit ‎ (← links)
  • 05000281/LER-1989-005-03, :on 890908,two of Four Condenser Waterbox Circulating Water Inlet Isolation Valves Closed Unexpectedly During Performance of Periodic Test.Caused by Relay in Flood Control Circuit That Did Not Drop Out ‎ (← links)
  • 05000281/LER-1989-003-02, :on 890813,charging Pump B Automatically Started After Control Switch Disengaged from pull-to-lock Position.Caused by Operator Not Adequately Engaging Pumps Switch in Position Prior to Event ‎ (← links)
  • 05000281/LER-1989-004-03, :on 890818,three motor-operated Valves in Safety Injection Sys Actuated.Caused by Electrician Inadvertently Energized Relay That Actuated Valves While Placing Jumper on Terminal.Investigation Begun ‎ (← links)
  • 05000281/LER-1989-002-03, :on 890517,emergency Diesel Generator 2 Automatically Started.Caused by Insufficient Procedural Guidance Re Certain Logic in Control Circuitry.Periodic Test Revised to Prevent Unexpected Automatic Starts ‎ (← links)
  • 05000281/LER-1989-001-02, :on 890105,loss of Containment Integrity Occurred During Refueling Operations.Caused by Loss of Administrative Controls Due to Procedural Deficiencies. Refueling Integrity Procedures Modified ‎ (← links)
  • 05000281/LER-1988-025-02, :on 881208,determined That Power Supplies for Two Safety Injection Valve Operators Reversed.Caused by Error During Initial Plant Const.Engineering Work Request Issued to Correct as-found Conditions ‎ (← links)
  • 05000281/LER-1988-023-02, :on 881006,three Containment Trip Valves Found Closed & Radiation Monitor Sample Pump & Particulate Monitor Discovered Stopped Due to Trip Valve Interlock.Caused by Personnel Error.Trip Valves Opened ‎ (← links)
  • 05000281/LER-1988-024-01, :on 881007,damage to Internal Components & Other Discrepancies During Disassembly of Inside Recirculation Spray Pumps a & B Noted.Cause Undetermined. Foreign Matl Removed.Repair of Pumps Initiated ‎ (← links)
  • 05000281/LER-1988-020-01, :on 880909,individual Rod Position Indicators for Four Control Rods of Control Bank D Differed from Demand Counter by More than 12 Steps.Caused by Indicator Indication Drift.Indicators Adjusted ‎ (← links)
  • 05000281/LER-1988-021-01, :on 880908,required Test Frequency for B Low Head Safety Injection Pump Exceeded.Caused by Inability of Operator to Obtain Required Vibration Test W/Test Equipment Used.Formal Training of Equipment Administered ‎ (← links)
  • 05000281/LER-1988-019-03, :on 880901,steam Generator a Inside Containment Steam Valve Closed for No Apparent Reason Due to Actuation of High Flow Trip Solenoid.Solenoid Reset,Blowdown Flow Established & Trip Valve & Solenoid Verified ‎ (← links)
  • 05000281/LER-1988-016-02, :on 880731,discovered That Individual Rod Position Indicators (Irpis) Differed from Group Step Demand Counter by Greater than 12 Steps.Caused by Drift in Irpi Indication.Irpis Adjusted ‎ (← links)
  • 05000281/LER-1988-015-02, :on 880626,rod Urgent Failure Annunciator Activated in Control Room.Caused by Failed Circuit Card & Blown Fuse.Failed Circuit Card & Blown Fuse Replaced & Rod Control Sys Tested Satisfactorily ‎ (← links)
  • 05000281/LER-1994-001-01, :on 940124,both Auxiliary Exhaust Filter Trains Declared Inoperable Due to Excessive flow.Six-h Action Statement to Hot Shutdown of Facility Entered Until Normal 1J Bus Alignment Restored ‎ (← links)
  • 05000281/LER-1993-006-03, :on 931115,Unit 2 Experienced Automatic Reactor Trip.Caused by Electrical Circuit Failure.Electrical Failure Traced to Defective Circuit Breaker & Replaced ‎ (← links)
  • 05000281/LER-1993-005-02, :on 930827,RT Occurred Due to Partial Actuation of Safety Injection Master Relay During Logic Testing. Replaced & Tested Relay ‎ (← links)
  • 05000281/LER-1993-004-02, :on 930823,reactor Tripped Due to Turbine - Generator Trip.Caused by Loss of Field Relay.Reactor Trip Breakers Verified Open & Control Rods Verified Inserted Into Core ‎ (← links)
  • 05000281/LER-1993-003-03, :on 930803,automatic Reactor Trip Occurred Due to Low Steam Generator Water Level Coincident W/Steam/ Feedwater Flow Mismatch Resulting from Spurious Closure of Main Feedwater Regulating Valve a ‎ (← links)
  • 05000281/LER-1995-003, :on 950224, as Found Calibration Test Data for Three RPS Transmitters Not within Allowable Tolerance. Caused by Faulty Pressure Gauge Used in Calibration.Pressure Gauge Replaced & Repeated Calibration Check ‎ (← links)
  • 05000281/LER-1995-002-02, :on 950210,lift Settings for Two MSSVs & Two Psvs Found to Be Outside as Found Range Allowed by TSs 3.6.A & 3.1.A.3.b.Caused by Setpoint Drift.Safety Valves Repaired & Readjusted ‎ (← links)
  • 05000281/LER-1995-001-02, :on 950204,pressurizer Heatup Exceeded TS Limit Due to Lack of Procedural Control.Cooldown Rate Reduced, Deviation Rept Submitted & Plant Data for Event Supplied to Westinghouse to Peform Technical Evaluation ‎ (← links)
  • 05000281/LER-1994-004-03, :on 941007,inoperable Condition Noted During Performance of Corrective Maint on Station Battery 2A.Caused by Inadequate post-maint Testing & Cognitive Personnel Error by Util Engineer.Process Changed ‎ (← links)
  • 05000281/LER-1994-003-03, :on 940617,primary Grade Water Supply Manual Isolation Valve 2-CH-212 Found in Open Position During Cold Shutdown Condition Due to Personnel Error.Valve 2-CH-212 Immediately Isolated & Secured ‎ (← links)
  • 05000281/LER-1994-002-01, :on 940307,filtered Exhaust Fan 1-VS-F-58B Tripped,Rendering Ventilation Filtered Exhaust Train Inoperable.Caused by Damper from Filter Was Found Halfway Shut.Filter Fully Opened & Device Tightened ‎ (← links)
  • 05000281/LER-1995-005, :on 950521,manual Reactor Trip Initiated.Cause Due to Loose Solder Connection on Circuit Card Which Caused CRs to Drop Into Core.Unit Placed in Safe Shutdown ‎ (← links)
  • 05000281/LER-1995-004, :on 950511,rod Control Sys Urgent Failure Annunciator Alarmed in Cr.Caused by Installation of Damaged Stationary Gripper Coil Regulation Circuit Card.Manual Reactor Trip Initiated & Card Replaced ‎ (← links)
  • 05000281/LER-1995-006, :on 950614,experienced Generator Trip,Followed by Turbine & Reactor Trips.Cause Believed to Be Due to Inadvertent Action During Maintenance But Not Confirmed.Unit Placed in Safe Shutdown ‎ (← links)
  • 05000281/LER-1995-007-01, :on 951107,RT Occurred Due to Failed Rc Pump Motor.Caused by Internal Motor Stator Windings Grounded. Shift Technical Advisor Monitored Critical Safety Function Status Trees to Verify Parameters Acceptable ‎ (← links)
  • 05000281/LER-1996-001-02, :on 960222,through-wall Leak Identified in Unit 2 RHR Piping.Caused by General Intergranular Attack on Inside Surface of Piping.Conservative Leakage Rate of One Drop Every Ten Minutes Estimated ‎ (← links)
  • 05000281/LER-1996-003-01, :on 960512,Unit 2 Pressurizer Safety Valve as Found Lift Setting Out of Tolerance.Valve Was Reassembled & Lift Setting Was Established & Tested Satisfactorily ‎ (← links)
  • 05000281/LER-1996-002-02, :on 960408,EDG Fire Suppression Sys Declared Inoperable Due to Personnel Error.Submitted Station Deviation Rept ‎ (← links)
  • 05000281/LER-1997-001-01, :on 970218,manual Reactor Trip & ESF Actuation Occurred Due to Loss of EHC Control Power.Caused by Momentary Short.Relay Card Was Replaced ‎ (← links)
  • 05000281/LER-1997-002, :on 961213,automatic Reactor Trip Occurred During Planned Shutdown.Caused by Steam Flow/Feedwater Flow Mismatch.Rps Functioned as Designed & Plant Placed in Hot Shutdown ‎ (← links)
  • 05000281/LER-1996-005-01, :on 960803,manual Reactor Trip.Caused by Loss of Electro Hydraulic Control Pressure.Repaired Two Compression Fitting Union Connections on Leaking Fitting & Performed Evaluations on Other Tubing ‎ (← links)
  • 05000281/LER-1996-004-02, :on 960606,turbine/reactor Trip Occurred.Caused by High Level in Steam Generator B.Placed Plant in Hot Shutdown Condition,Calculated Shutdown Margin & Monitored Critical Safety Function Status Trees ‎ (← links)
  • 05000281/LER-1999-002-02, :on 990425,MSSVs Tested Out of Tolerance for as Found Setpoint.Caused by Minor Setpoint Drift.No Immediate Action Required.Deviation Rept Submitted for Each Valve.With ‎ (← links)
  • 05000281/LER-1988-022-01, :on 880910,reactor Trip by Turbine Trip Occurred While Attempting to Maintain Turbine at Synchronous Speed.Caused by Inadequate Procedure & Faulty Valve Position Indication.Testing to Be Performed ‎ (← links)
  • 05000281/LER-1988-018-02, :on 880811,steam Generator B Channel III Steam Flow Failed to High Flow Indication.Failed Multiplier/ Divider Replaced.Affected Channels Placed in Trip Mode ‎ (← links)
  • 05000281/LER-1988-014-02, :on 880528,RCS PORV PCV-2455C Cycled Open & Closed,Simultaneous W/Rcs Venting & Filling.Caused by Failure to Revise RCS Venting Procedure.Operating Procedures Revised ‎ (← links)
  • 05000281/LER-1988-011-02, :on 880423,control Room/Relay Room Chiller Removed from Svc After Second Chiller Removed from Svc. Caused by Fouled Chiller Refrigerant filter-dryer Elements. Filter-dryer Elements Replaced ‎ (← links)
  • 05000281/LER-1988-009-02, :on 880420,component Cooling Water HXs Declared Inoperable.Caused by Vacuum Priming Lines Up to Isolation Valves Not Being Seismically Supported.Engineering Work Request to Install Seismic Supports Made ‎ (← links)
  • 05000281/LER-1988-007-02, :on 880405,individual Rod Position Indicators Declared Inoperable Due to Instrument Drift.Setpoint Change Evaluated to Lower Rod Deviation Alarm to Warn Operator Before Deviation Reached ‎ (← links)
  • 05000281/LER-1988-017-02, :on 880730,failure of Recirculation Spray Svc Water MOVs Due to Premature Actuation of Torque Switch. Both Valves Declared Inoperable & Tech Spec 3.0.1 Entered on Basis That Both Subsystems Were Inoperable ‎ (← links)
  • 05000281/LER-1988-013-01, :on 880523,reactor Trip Breakers Automatically Opened in Response to Reactor Trip Signal Generated on Low Steam Generator Water Level.Caused by Inadequate Procedure. Personnel Reinstructed on Deviating Procedures ‎ (← links)
  • 05000281/LER-1988-010-03, :on 880516,reactor Trip Occurred Due to lo-lo Steam Generator Level.Caused by Rapid Closure of Turbine Governor Valves.Turbine Impulse Pressure Transmitter Calibr. Further Monitoring Performed During Startup ‎ (← links)
  • 05000281/LER-1988-012-02, :on 880517,individual Rod Position Indicators for Four Rods in Shutdown Bank B Differed from Rod Group Demand Counter by Greater than 12 Steps.Caused by Incorrect Rod Position Indication Due to RCS Changes ‎ (← links)
  • 05000281/LER-1988-010-02, :on 880516,reactor Trip Occurred as Result of Steam Generator lo-lo Level.Caused by Rapid Closure of Turbine Governor Valves.Recorder Will Be Used to Monitor Electrohydraulic Control Sys During Startup ‎ (← links)
  • 05000281/LER-1988-008-02, :on 880505,reactor Operator Discovered That No Boric Acid Flowpath Existed from Boric Acid Storage Tanks to Charging Pumps.Caused by Personnel Error & Procedural Inadequacy.Procedures Will Be Revised ‎ (← links)
  • 05000281/LER-1988-004, :on 880327,turbine Runback Automatically Initiated Due to Loss of Power to Power Range Nuclear Instrument NI-43.Caused by Internal Conductor Failure Due to Age.Vital Bus Inverters Replaced ‎ (← links)
  • 05000281/LER-1988-003-01, :on 880220,individual Rod Position Indicators Differed from Demand Counter by Greater than 12 Steps. Caused by Generic Westinghouse PWR Concern.Indicators Calibr to Give Correct Readings ‎ (← links)
  • 05000281/LER-1988-006-02, :on 880310,fire Detection Circuit for Facility Containment & Emergency Switchgear Instrument Rack Room Rendered Inoperable.Caused by Failure of Remote Control Module EIIS-IC Imod.Failed Module Replaced ‎ (← links)
  • 05000281/LER-1988-005-02, :on 880305,control Rod Urgent Failure Alarm Received in Control Room.Caused by Failed Phase Control Card in 1BD Power Cabinet.Control Room Operator Placed Rod in Manual Per Abnormal Procedure for Malfunction ‎ (← links)
  • 05000281/LER-1988-002-02, :on 880202,containment Isolation Valves Declared Inoperable Due to Leakage in Excess of Spec Value. Cause Not Determined.Valves Will Be Replaced/Repaired Based Upon Failure Analysis Results ‎ (← links)
  • 05000281/LER-1988-001-02, :on 880127,leakage Through Containment Isolation Valves TV-SS-201A & TV-SS-201B Discovered Greater than ASME Section XI Spec.Valves Declared Inoperable.Caused by Misinterpretation of Sketches.Leads Lifted ‎ (← links)
  • 05000281/LER-1987-005-03, :on 871014 Electrician Inadvertently Completed Flood Protection Circuit Causing Two of Four Condenser Circulating Water Inlet Valves to Close.Caused by Personnel Error.Procedure Written for Maint Personnel ‎ (← links)
  • 05000281/LER-1986-018, :on 861112,discovered Environ Qualified Components Not Installed Per Approved Raychem Guidelines. Caused by Inadequate Training of Personnel Installing Matl. Procedures Revised & Addl Training Conducted ‎ (← links)
  • 05000281/LER-1987-003-01, :on 870404,reactor Tripped by Generator anti- Motoring Turbine Trip.Caused by Leaking Turbine Governor Valves.Valves Will Be Inspected & Repaired During Next Outage of Sufficient Duration ‎ (← links)
  • 05000281/LER-1987-002-01, :on 870316,reactor Trip by Turbine Trip Occurred,Resulting in Insertion of Shutdown Banks.Caused by Personnel Error.Reactor Trip Breakers Reset & Shutdown Banks Withdrawn ‎ (← links)
  • 05000281/LER-1987-001-03, :on 870312,loss of Reactor Coolant Loop Occurred Due to Loss of Charging Pumps & Seal Injection Flow to Reactor Cooling Pumps.Caused by Personnel Error.Personnel Reinstructed Re Listed Procedures ‎ (← links)
  • 05000281/LER-1986-020-02, Forwards LER 86-020-02 & Surry Unit 2 Reactor Trip & Feedwater Pipe Failure Rept ‎ (← links)
  • 05000281/LER-1981-030-03, /03L-0:on 810504,emergency Diesel Generator Output Breaker Opened on Overspeed.Caused by Misaligned Overspeed Trip Limit Switch.Limit Switch Adjusted & Generator Tested Satisfactorily ‎ (← links)
  • 05000281/LER-1981-029-03, /03L-0:on 810502,leakage Monitoring Valve 2-CV-12 Found Open & Downstream Pipe Cap Missing Following Return to Power on 810428.Caused by Inadequate Procedure.Valve Closed & Pipe Cap Replaced ‎ (← links)
  • 05000281/LER-1981-028-03, /03L-0:on 810502,emergency Diesel Generator Output Breaker Closed Inadvertently,Motorizing Generator 3.Caused by Inadequate Procedure Not Positively Controlling Generator Position.Generator Started & Loaded ‎ (← links)
  • 05000281/LER-1981-027-03, /03L-0:on 810501,TV-MS-201C Control Circuit Would Not Respond to Train B Actuation Signal.Caused by Shorting of Train B Coil Due to Moisture.Coil Replaced ‎ (← links)
  • 05000281/LER-1981-027, Forwards LER 81-027/03L-0 ‎ (← links)
  • 05000281/LER-1981-026-03, /03L-0:on 810429,charging Pump Svc Water Pump 2-SW-P-10A Failed to Operate.Caused by Svc Water Splashing Down Into Motor,Causing Electrical Short & Damaging Windings.Motor Replaced ‎ (← links)
  • 05000281/LER-1981-026, Forwards LER 81-026/03L-0 ‎ (← links)
  • 05000281/LER-1981-018-03, /03L-0:on 810318,amp Readings for Heat Tracing Panel 10,circuit 4A,were Below Acceptance Criteria Per PT-27.Caused by Excessive Heat.Defective Heat Tracing Replaced & Tested ‎ (← links)
  • 05000281/LER-1981-015-03, /03L-0:on 810315,PT-26.1 Revealed That Process Vent Radiation Monitor Pump Failed to Rotate.Caused by Failure of Pump Bearings.Pump Replaced ‎ (← links)
  • 05000281/LER-1981-024-03, /03L-0:on 810320,w/Unit 2 at 100% Power,Radiation Alarm Setpoint for Component Cooling Sys Found Greater than Twice Background.Caused by Decrease in Background Activity. Monitor RM-CC-106 Reset to Correct Setpoint ‎ (← links)
  • 05000281/LER-1981-024, Forwards LER 81-024/03L-0 ‎ (← links)
  • 05000281/LER-1981-021-03, /03L-0:on 810302,svc Water Strainer for Air Conditioner Condenser a Found Clogged.Caused by Matl Entrained in Svc Water Sys.Strainer Cleaned ‎ (← links)
  • 05000281/LER-1981-021, Forwards LER 81-021/03L-0 ‎ (← links)
  • 05000281/LER-1981-020-03, /03L-0:on 810223,during Full power,RM-CC-106 Alert & High Alarm Lights Energized W/O Initiating Required Automatic Action.Caused by Failed Card in Alarm Circuit.Card Replaced & Tested ‎ (← links)
  • 05000281/LER-1981-020, Forwards LER 81-020/03L-0 ‎ (← links)
  • 05000281/LER-1981-019-03, /03L-0:on 810218,amp Readings for Heat Tracing Panel 9,circuit 6A Were Low.Caused by Excessive Heat.Heat Tracing Replaced ‎ (← links)
  • 05000281/LER-1981-010-03, /03L-0:on 810209,svc Water pump,2-SW-P-10B, Developed Low Discharge Pressure.Caused by Eel Lodged in Impeller.Eel Removed & Pump Returned to Svc ‎ (← links)
  • 05000281/LER-1981-010, Forwards LER 81-010/03L-0 ‎ (← links)
  • 05000281/LER-1981-017-03, /03L-0:on 810210,intermediate Range Channel N36 High Level Trip Setpoint Found in Excess of Tech Spec.Caused by Setpoint Drift.Setpoint Adjusted ‎ (← links)
  • 05000281/LER-1981-008-03, /03L-0:on 810206,output Amperage for RM-CC-106 Reduced in Nonconservative Direction.Caused by Failed Remote Indicator Module in Auxiliary Bldg.Module Isolated & RM-CC-106 Recalibr.Monitor Will Be Repaired ‎ (← links)
  • 05000281/LER-1981-005-03, /03L-0:on 810204,air Motors for Preferred Start 2 of Emergency Diesel Generator 3 Found Engaged to Flywheel. Caused by Air Leakage Through Solenoid Valve.Solenoid & Air Motors Replaced ‎ (← links)
  • 05000281/LER-1981-016-03, /03L-0:on 810119,at 100% Power,Positive Pressure Greater than 0.05 Inches Water Could Not Be Maintained in Control Room.Caused by Deteriorated Seals on Door to Control Room Complex.Defective Doors Repaired ‎ (← links)
  • 05000281/LER-1981-016, Forwards LER 81-016/03L-0 ‎ (← links)
  • 05000281/LER-1981-007-03, /03L-0:on 810114,at 100% power,PT-27 (Heat Tracing) Revealed Amp Readings for Panels 8 & 9 Circuits Were Below Acceptance Criteria.Caused by Excessive Temps Breaking Down Insulation.Defective Heat Tracing Replaced ‎ (← links)
  • 05000281/LER-1981-006-03, /03L-0:on 810114,at Full Power,C Safety Injection Accumulator Found to Have Boron Concentration of 1943 Ppm, 7 Ppm Below Required Limit.Caused by Leakage Through Check Valve 1-SI-144.Valve Isolated ‎ (← links)
  • 05000281/LER-1981-013-03, /03L-0:on 810119,improperly Sealed Fire Barrier Penetration Discovered.Caused by Improper Matl Being Packed Into Penetration.Penetration Properly Sealed ‎ (← links)
  • 05000281/LER-1981-011-03, /03L-0:on 810119,fire Watch Not Maintained While Fuel Oil Pumphouse Carbon Dioxide Sys Out of Svc for Design Change Mods.Caused by Personnel Leaving Post.Fire Watch re-established & Personnel Disciplined ‎ (← links)
  • 05000281/LER-1981-012-03, /03L-0:on 810118,boric Acid Transfer Pump 1-CH-P-2D Failed.Caused by Bearing Failure Due to Oil Seal Failure.Pump Repaired ‎ (← links)
  • 05000281/LER-1981-012, Forwards LER 81-012/03L-0 ‎ (← links)
  • 05000281/LER-1981-009-03, /03L-0:on 810105,PT-27A Revealed Loss of Heat Tracing for Panel 11 Circuit 4C.Caused by Short in Heat Tape.Defective Heat Tracing Replaced.Design Change Initiated ‎ (← links)
  • 05000281/LER-1981-004-03, /03L-0:on 810107,reactor Trip Breaker a Failed to Open.Caused by Sporadic Failure of Under Voltage Device Due to Missing Bushing.Under Voltage Device Replaced ‎ (← links)
  • 05000281/LER-1981-003-03, /03L-0:on 810106,liquid Radwaste Monitors RM-GW-101,102,RM-VG-103,104,RM-SW-107 & RM-LW-108 Failed Low.Caused by Failed Fuse.Fuse Replaced ‎ (← links)
  • 05000281/LER-1981-002-03, /03L-0:on 810105,PT-27A Revealed Loss of Heat Tracing for Panel 10 Circuits 1A & 1B & Panel 11 Circuit 4A. Caused by Open Heating Elements.Defective Heat Tracing Tape Replaced ‎ (← links)
  • 05000281/LER-1981-001-03, /03L-0:on 810102,one Boric Acid Flow Path to Core Inoperable.Caused by Personnel Inadvertently Closing Valve 2-CH-226.Flow Path Restored & Personnel Reinstructed ‎ (← links)
  • 05000281/LER-1980-049-03, /03L-0:on 801231,electrical Penetration E-4 Through Fire Wall Between Equipment Rooms 2 & 3 Turbine Basement Found Open.Caused by Fire Stop Removed to Accomodate Welding Lead.Fire Stop Repaired ‎ (← links)
  • 05000281/LER-1980-049, Forwards LER 80-049/03L-0 ‎ (← links)
  • 05000281/LER-1980-045-03, /03L-0:on 801207,containment Vacuum Pumps Were Found Inoperable Due to Open Relay Contact.Caused by Broken Lug on Coil Lead.Lug Was Replaced & Circuit Returned to Normal ‎ (← links)
  • 05000281/LER-1980-045, Forwards LER 80-045/03L-0 ‎ (← links)
  • 05000281/LER-1980-046-03, /03L-0:on 801217,breaker Feeding MOV-CW-200C Found Open.Caused by Coat Hung on Operating Arm of Circuit Breaker.Coat Removed ‎ (← links)
  • 05000281/LER-1980-003-03, MOV-CW-200B Found Inoperable.Caused by Electrical Malfunction Due to Mechanical Repair in Progress.Redundant Water Box Inlet Valve MOV-CW-206B Was Shut ‎ (← links)
  • 05000281/LER-1980-003, Forwards Updated LER 80-003/03L-1 & LER 80-046/03L-0 ‎ (← links)
  • 05000281/LER-1980-044-03, /03L-0:on 801124,pump 2-SI-P-1A Declared Inoperable Due to Low Resistance.Caused by Connection Box Grounded Out by Rainwater.Box Dried Out,Roof Hatch Repaired & Pump & Motor Tested ‎ (← links)
  • 05000281/LER-1980-034-03, /03L-0:on 801122,valve MOV-CW-200A Failed 75% Open.Caused by Corroded Torque Switch Stuck in Open Position.Switch Replaced ‎ (← links)
  • 05000281/LER-1980-043-03, /03L-0:on 801122,PT-33 Failed to Meet Required Criterion of 0.05 Inches of Water.Caused by Excessive Leakage from 2B Battery Room Door.Battery Room Door Repaired ‎ (← links)
  • 05000281/LER-1980-042-03, /03L-0:on 801115,found Emergency Diesel Generator 3 Failed to Start Manually from Control Room.Caused by Vanes on Air Motor Worn Beyond Acceptance Limits.Vanes Repaired ‎ (← links)
  • 05000281/LER-1980-040-03, /03L-0:on 801114,found Charging Pump Svc Water Pump 2-SW-P10A Developed Low Discharge Pressure of 10 Psig. Caused by Matl Entrained in Water & Being Deposited on Pump Impeller.Pump Disassembled,Cleaned & Returned to Svc ‎ (← links)
  • 05000281/LER-1980-038-03, /03L-0:on 801105,on-svc Boric Acid Storage Tank & Boron Injection Tank Concentration Found Less That 11.5%. Caused by Improper Valve Lineup.Boric Acid Concentration Increased ‎ (← links)
  • 05000281/LER-1980-037-03, /03L-0:on 801105,high Temp on Charge Pump a (2-CH-P-1A) Revealed Low Svc Water Flow.Low Discharge Pressure Alarm Failed to Annunciate.Caused by Clogged Pump Inlet Strainer & Clogged Pressure Switch Sensing Line ‎ (← links)
  • 05000281/LER-1980-036-03, /03L-0:on 801101,discovered That MOV-FW-251B Could Not Be Closed from Control Room.Caused by Misplacement of Limitorque Cover & Three Broken Control Wires.Cover & Wires Replaced ‎ (← links)
  • 05000281/LER-1980-036, Forwards LER 80-036/03L-0 ‎ (← links)
  • 05000281/LER-1980-035-01, /01T-0:on 801101,electrical Transient Tripped Breaker & Two Emergency Generators Started & Loaded.Caused by Contact of Jackhammer with Power Cable.Emergency Diesel Generators Verified Operating & Supplying Emergency Buses ‎ (← links)
  • 05000281/LER-1980-031-03, /03L-0:on 801015,pipe Support in Alternate Charging Header Found in Overstressed Condition Per IE Bulletin 79-14,Suppl 2.Caused by Faulty Installation. Modified Support & Returned Subsys to Svc ‎ (← links)
  • 05000281/LER-1980-029-03, /03L-0:on 801012,svc Water Pump 2-SW-P-10A Developed Low Discharge Pressure.Caused by Eel Lodged in Impeller.Eel Removed,Pump Returned to Svc ‎ (← links)
  • 05000281/LER-1980-029, Forwards LER 80-029/03L-0 ‎ (← links)
  • 05000281/LER-1980-030-03, /03L-0:on 801013,at 100% power,PT-27B Indicated Low Amp Reading on Circuit 6A,boric Acid to Blender Panel 10.Caused by Heat Tracing Failure Due to Mechanical Damage Sustained from Erecting Scaffolding ‎ (← links)
  • 05000281/LER-1980-030, Forwards LER 80-030/03L-0 ‎ (← links)
  • 05000281/LER-1980-027-03, /03L-0:on 801005,w/unit at 100% power,PT-27B Revealed That Amp Reading for Circuit 6A,boric Acid to Blender,Panel 11 Was Below Acceptance Criteria.Caused by Failure of Heat Tracing Tape Due to Excessive Heat ‎ (← links)
  • 05000281/LER-1980-026-03, /03L-0:on 801005,w/reactor at 100% Power & Redundant Low Head Safety Injection Pump Out of Svc for Maint,Operator Failed to Retest Operable Pump 2-SI-P-1a within Specified Time.Caused by Operator Oversight ‎ (← links)
  • 05000281/LER-1980-023-03, /03L-0:on 801003,while Operating at 100% Power, During Periodic Test 27D,low Amp Readings Found on Circuit 1B,panels 10 & 11,causing Valve MOV-2867D to Be Considered Inoperable.Caused by Damaged Heat Tracing Tapes ‎ (← links)
  • 05000281/LER-1980-028-03, /03L-0:on 800926,w/unit at 100% Power,Reduction in Svc Water Pressure to Charging Pumps Experienced.Caused by Missing Valve Disk for Check Valve 2-SW-112.Valve Replaced ‎ (← links)
  • 05000281/LER-1980-028, Forwards LER 80-028/03L-0 ‎ (← links)
  • 05000281/LER-1980-011-01, /01T-0:on 800819,at 12% Power,Steam Flow Transmitters (FI-474,475,484,485,494 & 495) Isolated Contrary to Tech Spec-3.7.B.Caused by Transmitters Being Isolated Following Containment Integrated Leak Rate Test ‎ (← links)
  • 05000281/LER-1980-011, Forwards LER 80-011/01T-0 ‎ (← links)
  • 05000281/LER-1979-008-03, During Surveillance Check,Found Deterioration of Piping on Low Portion of Recirculation Spray Subsystems.Caused by Chloride Stress Corrosion.Piping Replaced W/Nonsensitized Piping ‎ (← links)
  • 05000281/LER-1979-008, Forwards Updated LER 79-008/03X-1 ‎ (← links)
  • 05000281/LER-1980-009-01, /01T-0:on 800718,Westinghouse LOCA ECCS Reanalysis Indicated Error in Fuel Clad Burst Model.Caused by Reduction in Clad Heatup Rate Which Shifts Fuel Clad Burst Curve & Results in Earlier Clad Burst.Limit Will Be Controlled ‎ (← links)
  • 05000281/LER-1980-009, Forwards LER 80-009/01T-0 ‎ (← links)
  • 05000281/LER-1980-021-03, /03L-0:on 800826,while Attempting to Pressurize Accumulator B Using Normal Nitrogen Supply,Pressure Fell Below Allowable Limits.Caused by Leak & Low Pressure in Nitrogen Fill Header.Added Pressure to Sys & Repaired Leak ‎ (← links)
  • 05000281/LER-1980-022-03, /03L-0:on 800826,w/unit Operating at Steady State, Channel III Flow Computer,For Steam Generator Steam Flow Fc 2474,failed.Caused by Loose Printed Circuit Board & Cold Solder Joint on Filter Capacitor.Board & Capacitor Repai ‎ (← links)
  • 05000281/LER-1980-020-03, /03L-0:on 800822 After Boric Acid Batching,Chemist Reported Concentration Above Tech Spec Requirements.Caused by Transfer of Batch Tank to Inservice Bast.Manual Shutdown Initiated & Boric Acid Diluted to Tech Spec Limits ‎ (← links)
  • 05000281/LER-1980-019-03, /03L-0:on 800822,during Operation Trip Valve TV- SS-206B Would Not Stay Closed When Actuated from Control Room.Caused by Misadjusted Limit Switch.Valve Isolated & Position Limit Switch Readjusted ‎ (← links)
  • 05000281/LER-1980-017-03, /03L-0:on 800820,during Unit 2 Startup at 18% Power,Control Room Surveillance Revealed Zero Reading from Main Steam Flow Transmitter.Caused by Partially Closed Equalizing Valve.Bistables Tripped & Valve Closed ‎ (← links)
  • 05000281/LER-1980-015-03, /03L-0:on 800816,after Pressurization of Accumulator Tanks,Level Indicator for B SI Accumulator Indicated 61% Level,Above Tech Spec Max of 58.3%.Caused by Condensation & High Pressure in Nitrogen Feed Line ‎ (← links)
  • 05000281/LER-1980-013-03, /03L-0:on 800815,during Startup Testing,Boric Acid Concentration of 13.8% Was Reported in 1-CH-TK-1C & 2-SI-TK- 2.Caused by Pumping Boric Acid from Boron Evaporator Bottoms Tank to Boric Acid Storage Tank W/O Sampling ‎ (← links)
  • 05000281/LER-1980-012-03, /03L-0:on 800815,review of Unit 2 Pipe Support Showed That Seismic Support for Charging Pump 2-CH-P-1B Had Not Been Installed.Caused by Administrative Error.Support Installed ‎ (← links)
  • 05000281/LER-1980-008-03, /03L-0:on 800623,while Performing Periodic Test 26.1,found Air Ejector Monitor Alarm Setpoint Above Tech Spec Requirement.Caused by Instrument Drift.Alarm Setpoint Recalibr ‎ (← links)
  • 05000281/LER-1980-008, Forwards LER 80-008/03L-0 ‎ (← links)
  • 05000281/LER-1980-007-03, /03L-0:on 800606,w/unit in Cold Shutdown,Smoke Detectors Found Inoperable.Caused by Breaker Trip at Motor Control Ctr Which Feeds Detectors.Cause of Breaker Trip Unknown ‎ (← links)
  • 05000281/LER-1980-007, Forwards LER 80-007/03L-0 ‎ (← links)
  • 05000281/LER-1980-006-03, /03L-0:on 800527,contrary to Tech Spec 3.1.G.2.b. (1),Containment 2 Pressurizer Level Exceeded 33% W/O Mitigation Protection.Caused by Addition of Water to Primary Sys to Maintain Level Indication.Rcs Drained ‎ (← links)
  • 05000281/LER-1980-006, Forwards LER 80-006/03L-0 ‎ (← links)
  • 05000281/LER-1980-004-01, /01T:on 800521,during Cold Shutdown,Pressure Transmitter 458 Inoperable Due to Wiring Problem & Isolation Valve for Pressure Transmitter 403 Found Closed,Negating Overpressure Mitigating Sys.Caused by Cable Problem ‎ (← links)
  • 05000281/LER-1980-004, Forwards LER 80-004/01T-0 ‎ (← links)
  • 05000281/LER-1980-001-01, /01T-0:on 800310,review of Delta Flux Computer Program Revealed Deficiency in Periodic Test 28.9, Incore- Excore Hi Calibr. Caused by Failure to Extend Calibr of Control Board Delta Flux Meters to 120% Power Range ‎ (← links)
  • 05000281/LER-1980-001, Forwards LER 80-001/01T-0 ‎ (← links)
  • 05000281/LER-1979-013-01, /01T-0:on 791007,MOV-SW-202B Operated Mechanically & Electrically in Apparent Reverse Manner W/Unit at Cold Shutdown.Caused by Disc Spline of Svc Water Valve Improperly Aligned to Gear Train of Motor Operator ‎ (← links)
  • 05000281/LER-1979-013, Forwards LER 79-013/01T-0 ‎ (← links)
  • 05000281/LER-1979-012-08, /08T-0 on 790507:caustic Residue Discovered on 62 New Fuel Assemblies.Caused by Industrial Sabotage. Fuel Removed & Assemblies Rinsed.Investigation Continuing ‎ (← links)
  • 05000281/LER-1979-012, Forwards LER 79-012/08T-0 ‎ (← links)
  • 05000281/LER-1979-011-12, /12T-0 on 790414:individual Received Excessive Dose While Inspecting Area Beneath Vessel.Caused by Elevated Radiation Levels Due to Incore Instrumentation Refueling Status.Individual Disciplined ‎ (← links)
  • 05000281/LER-1979-011, Forwards LER 79-011/12T-0 ‎ (← links)
  • 05000281/LER-1979-010-03, /03L-0 on 790306:during tests,19 of 30 Snubbers Did Not Meet Acceptance Criteria.Caused by Setting Drift & non-readjustment to Optimum Settings After Previous Satisfactory Tests.Snubbers Readjusted,Repaired or Replaced ‎ (← links)
  • 05000281/LER-1979-010, Forwards LER 79-010/03L-0 ‎ (← links)
  • 05000281/LER-1979-009-03, /03L-0 on 790208:while Performing Penetrant Test 39B-1,mechanic Discovered 3 Snubbers Were Not on Test.Caused by Inadvertent Omission.Change Initiated to Add 3 Snubbers to Penetrant Test 39B-1 ‎ (← links)
  • 05000281/LER-1979-009, Forwards LER 79-009/03L-0 ‎ (← links)
  • 05000281/LER-1979-007-03, /03L-0 on 790205:during Functional Test,Damper 1-VS-103A Failed to Close on Train a Safety Injection Initiation.Caused by Hang Up in Brake Mechanism Holding Supply Damper Open Against Closed Spring.Damper Closed ‎ (← links)
  • 05000281/LER-1979-006-03, /03L-0 on 790204:at Cold Shutdown,Valve MOV-SW-203D Failed to Operate Electrically During Functional Test.Caused by Mechanical Binding of Valve.Valve Bearing Was Replaced ‎ (← links)
  • 05000281/LER-1979-005-03, /03L-0 on 790204:at Cold Shutdown,Valve MOV-SW-203C Failed to Cycle Electrically.Caused by Slighting Bent Clutch Shaft in Valve Operation.Part Dismantled & Overhauled ‎ (← links)
  • 05000281/LER-1978-038-03, /03X-1 on 781030:boric Acid Flow from Boric Acid Tank to Blender Was Interrupted.Caused by Blockage of Crystallized Boron at Elbow in Line 1-CH-356-152 ‎ (← links)
  • 05000281/LER-1978-033-03, /03X-1 on 780926:circulating Water Outlet Valve MOV-CW-200D Failed to Close When Operated Electrically. Caused When Actuator Cam for Shut Torque Switch Became Wedged Against Torque Switch Hold Down Screw ‎ (← links)
  • 05000281/LER-1979-004-03, /03L-0 on 790204:setpoints of Seven Main Steam Safety Valves Not within Tech Spec Limits.Caused by Normal Setpoint Drift ‎ (← links)
  • 05000281/LER-1979-004, Forwards LER 79-004/03L-0 ‎ (← links)
  • 05000281/LER-1979-003-03, /03L-0 on 790122: Following Containment Entrance Equipment Hatch Escape Airlock,Outer Door Was Not Proven Sealed within 72-h from Initial Opening.Caused by Problems in Sealing Exterior Hatch ‎ (← links)
  • 05000281/LER-1979-002-03, /03L-0 on 790120: During Normal Operation Channel Check Revealed That Pressurizer Pressure Channel I Drifted Above Tech Spec Limit as Compared to Channels II & Iii. Caused by Failure of Channel I Pressure Transmitter ‎ (← links)
  • 05000281/LER-1979-002, Forwards LER 79-002/03L-0 & 79-003/03L-0 ‎ (← links)
  • 05000281/LER-1979-001-03, /03L-0 on 790112:personnel Batch Inner Door & Emergency Escape Manway Not Leak Tested within 72-h After Opening Because Escape Manway Safety Lock Believed Broken, Posing Hazard ‎ (← links)
  • 05000281/LER-1979-001, Forwards LER 79-001/03L-0 ‎ (← links)
  • 05000281/LER-1978-041-03, /03l on 781201:failure of Heat Tracing Circuit 5A (Panel 10)Unit 2 Blender to Charging Pump Suction Due to Water Damage of Heat Tracing Circuit.Heat Tracing Tape Replaced ‎ (← links)
  • 05000281/LER-1978-041, Forwards LER 78-041/03L-0 ‎ (← links)
  • 05000281/LER-1978-040-03, /03L-0 on 781116:routine Testing Revealed Failure of Heat Tracing Circuit 4C Unit 2 Boron Injection Tank Top Recirculation Return.Caused by Boric Acid Damage to the Heat Tracing Circuit ‎ (← links)
  • 05000281/LER-1978-039-03, /03L-0 on 781115:during Normal Oper,It Was Noted That B Loop Hot Leg Temp Sensing Element TI-2-422A Was Drifting Low.Caused by Packing Leak Which Reduced Resistance of the Sensing Element ‎ (← links)
  • 05000281/LER-1978-039, Forwards LER 78-039/03L-0 & 78-040/03L-0 ‎ (← links)
  • 05000281/LER-1978-038, Forwards LER 78-038/03L-0 ‎ (← links)
  • 05000281/LER-1978-037-03, /03L-0 on 781022:with Unit at Rated Pwr,Panel Indicator for Radiat Monitor RM-213 Monitoring a Steam Generator Blowdown Read 0.Caused by Loose Connector Joining Detector Cable to Electronic Chassis ‎ (← links)
  • 05000281/LER-1978-037, Forwards LER 78-037/03L-0 ‎ (← links)
  • 05000281/LER-1978-036-03, /03L-0 on 781015:compensatory Surveillance on RCP Cstator & Hearing Temp Had Not Been Performed.Caused by Failure of Operating Personnel to Restore Process Computer Trend Block Following Computer Reinitialization ‎ (← links)
  • 05000281/LER-1978-036, Forwards LER 78-036/03L-0 ‎ (← links)
  • 05000281/LER-1978-035-03, /03L-0:on 781007,during Cold Shutdown,Valve Pit Flooded While Draining Circulating Water Box D.Caused by Damage of Valve from Flooding ‎ (← links)
  • 05000281/LER-1978-034-03, /03L-0:on 781006,w/unit at Cold Shutdown,Snubbers 2-RH-HSS-20 & 2-WFPD-HSS-9 Inoperable.Caused by Low Fluid Level.Defective Snubbers Dry Because of Leaking Rod Seals & Mechanical Damage to Seals.Snubbers Replaced ‎ (← links)
  • 05000281/LER-1978-032-03, /03L-0:on 780921,heat Tracing Circuit Manual Boration/Boric acid-to-blender Failed.Caused by Boric Acid Penetration of Heat Tracing Tape Circuits.Heat Tracing Tape Replaced ‎ (← links)
  • 05000281/LER-1978-032, Forwards LER 78-032/03L-0 ‎ (← links)
  • 05000281/LER-1978-033, Forwards LER 78-033/03L-0 ‎ (← links)
  • 05000281/LER-1978-011-03, /03X-1 on 780305:During Normal Full Pwr Oper,There Was No Svc Water Flow Thru Charging Pump Intermediate Seal Cooler 2-SW-E-1B,due to Failure of the Coolers Discharge Gate Valve ‎ (← links)
  • 05000281/LER-2016-001, Regarding Reactor Trip Due to Generator Differential Lockout ‎ (← links)
  • 05000281/LER-2015-002, Regarding Unanticipated Start of EDG 2 During Testing ‎ (← links)
  • 05000281/LER-2015-001, Regarding Reactor Trip During Turbine Testing ‎ (← links)
  • 05000281/LER-2014-002, Regarding Reactor Trip Due to Loose Termination on Reactor Trip Relay ‎ (← links)
  • 05000281/LER-2014-001, Regarding Pressurizer Safety Valves Fail As-Found Setpoint Testing ‎ (← links)
  • 05000281/LER-2013-002, Regarding Partially Open Valve Results in Pump Inoperability That Exceeded Technical Specifications Actions ‎ (← links)
  • 05000281/LER-2013-001, Bird Contacting Power Lines Results in Emergency Diesel Generator Auto-Start ‎ (← links)
  • 05000281/LER-2011-003, Regarding Isolation of Main Feedwater Pump Results in Auxiliary Feedwater Actuation ‎ (← links)
  • 05000281/LER-2011-002, For Surry Power Station, Unit 2, Regarding Spurious Safety Injection Results in Exceeding Pressurizer Heatup Rate ‎ (← links)
  • 05000281/LER-2009-001, Regarding Manual Reactor Trip Initiated to Replace a Rod Control Data Logging Card ‎ (← links)
  • 05000281/LER-2011-001, Regarding Auto Reactor Trip on Low Coolant Flow Due to Loop Stop Valve Failure ‎ (← links)
  • 05000281/LER-2008-001, Pressurizer Safety Valves Fail as Found Setpoint ‎ (← links)
  • 05000281/LER-2006-001, Regarding Charging Pump Component Cooling Water System Inoperable Due to Inadequate Venting ‎ (← links)
  • 05000281/LER-2005-001, Regarding Low Head Safety Injection Pump Breaker Failed to Close Due to Binding ‎ (← links)
  • 05000281/LER-2004-001-01, Regarding Switchyard Device Failure Results in a Reactor Trip ‎ (← links)
  • 05000281/LER-2003-002, Regarding Inside Recirculation Spray Pump Breaker Failed to Close Due to Mechanical Binding ‎ (← links)
  • 05000281/LER-2002-003, From Surry, Unit 2 Regarding Reactor Trip Due to Turbine Electric Hydraulic Control Circuitry Failure ‎ (← links)
  • 05000281/LER-2002-004, From Surry Power Station, Unit 2 Regarding Turbine Trip Fuses Removed Resulting in Condition Prohibited by Tech Specs ‎ (← links)
  • 05000281/LER-2002-002, Re Low Head Safety Injection System Inoperable Due to Partially Closed Valve ‎ (← links)
  • 05000281/LER-2002-001, Residual Heat Removal Piping Corrosion Through-Wall Leak on April 13, 2002 ‎ (← links)
• ML14182A089 (redirect page) ‎ (← links)
• 05000281/LER-2014-002, Regarding Reactor Trip Due to Loose Termination on Reactor Trip Relay ‎ (← links)
• 05000280/LER-2014-001, Regarding Closed Service Water Valve Results in Exceeding Technical Specifications ‎ (← links)