Pages that link to "05000313/LER-2023-001, Automatic Reactor Trip Due to Reactor Protection System Actuation"
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The following pages link to 05000313/LER-2023-001, Automatic Reactor Trip Due to Reactor Protection System Actuation:
Displayed 4 items.
- 05000313/LER-2023-002, Reactor Protection System Underpower Relay Test Failure Resulting in Condition Prohibited by Technical Specifications (← links)
- ML23104A162 (redirect page) (← links)
- 05000313/LER-1923-001, Automatic Reactor Trip Due to Reactor Protection System Actuation (redirect page) (← links)
- 05000313/LER-1923-001 (redirect page) (← links)
- 05000313/LER-2023-001 (redirect page) (← links)
- 05000313/LER-2001-004 (← links)
- 05000313/LER-2001-003 (← links)
- 05000313/LER-2001-002 (← links)
- 05000313/LER-2001-001 (← links)
- 05000313/LER-1982-012, Forwards LER 82-012/03L-0 (← links)
- 05000313/LER-1982-011, Forwards LER 82-011/03L-0 (← links)
- 05000313/LER-1982-010, Forwards LER 82-010/03L-0 (← links)
- 05000313/LER-1982-009, Forwards LER 82-009/01T-0 (← links)
- 05000313/LER-1982-019, Forwards LER 82-019/03L-0 (← links)
- 05000313/LER-1982-025, Forwards LER 82-025/03L-0 (← links)
- 05000313/LER-1982-026, Forwards LER 82-026/03L-0 (← links)
- 05000313/LER-1982-027, Forwards LER 82-027/03L-0 (← links)
- 05000313/LER-1982-021, Forwards LER 82-021/03L-0 (← links)
- 05000313/LER-1982-020, Forwards LER 82-020/03L-0 (← links)
- 05000313/LER-1982-008, Forwards LER 82-008/03L-0 (← links)
- 05000313/LER-1982-017, Forwards LER 82-017/03L-0 (← links)
- 05000313/LER-1982-016, Forwards LER 82-016/03L-0 (← links)
- 05000313/LER-1982-015, Forwards LER 82-015/03L-0 (← links)
- 05000313/LER-1982-014, Forwards LER 82-014/03L-0 (← links)
- 05000313/LER-1982-013, Forwards LER 82-013/03L-0 (← links)
- 05000313/LER-1989-041, Revises Commitment Completion Date for LER 89-041-00 Re Proper Method of Calibr of Startup Feedwater Control Valves CV-2623 & 2673 to 900915.Delay Due to Time Needed to Review & Implement New Calibr Guidance Criteria (← links)
- 05000313/LER-1983-003, Forwards LER 83-003/03L-0 (← links)
- 05000313/LER-1982-024, Forwards LER 82-024/03L-0 (← links)
- 05000313/LER-1983-008, Forwards LER 83-008/03L-0 (← links)
- 05000313/LER-1983-006, Forwards LER 83-006/03L-0 (← links)
- 05000313/LER-1983-023, Updated LER 83-023/03X-6:on 830916-1120,fire Protection Deficiencies Discovered.Caused by Inadequate Original Installation Specs & Acceptance Criteria.Walkdown Insp in Progress.Insp Program Being Developed (← links)
- 05000313/LER-1983-010, Forwards LER 83-010/03L-0 (← links)
- 05000313/LER-1983-005, Forwards LER 83-005/03L-0 (← links)
- 05000313/LER-1983-009, Forwards LER 83-009/03L-0 (← links)
- 05000313/LER-1983-007, Revised LER 83-007/03X-1:on 830308 & 21,reactor Bldg Pressure Switches PS-2403 & PS-2401 Found to Be Out of Tolerance,Opening at 18.9 Psia.Pressure Switches Reset at 18.5 Psia Per Calibr Procedure (← links)
- 05000313/LER-1983-004, Forwards LER 83-004/03L-0 (← links)
- 05000313/LER-1978-028, Forwards LER 78-028/03L-0 (← links)
- 05000313/LER-1988-029, Forwards LER 88-029-00 Re Seismic Qualification of RCS Letdown.Rept Date in Relation to Date of Determination Discussed W/Nrc in 890714 & 0721 Ltrs (← links)
- IR 05000313/2024001 (← links)
- 05000313/LER-2024-001, Source Range Nuclear Instrument Failure Resulting in Condition Prohibited by Technical Specifications (← links)
- 05000313/LER-2023-002, Reactor Protection System Underpower Relay Test Failure Resulting in Condition Prohibited by Technical Specifications (← links)
- 05000313/LER-2021-002, Automatic Reactor Trip Due to High Reactor Coolant System Pressure (← links)
- 05000313/LER-2021-001, Reactor Manual Trip Due to Temporary Loss of Non-Vital 4160 Volt Bus (← links)
- 05000313/LER-1998-002-03, :on 980505,automatic Actuation of CREVS Occurred Due to Higher than Normal Radiation at Detector When Filtration/Vacuum Assembly Was Moved in Adjacent Area. Revised Procedures to Add Noted Precautions (← links)
- 05000313/LER-1989-008, :on 890122,determined That When Bypass Valve GCH-29 Normally Open,Ability of Radiation Monitors to Perform Required Functions Not Ensured.Caused by Error in Design Change in Bypass Line & Valve (← links)
- 05000313/LER-1988-025, :on 880307,reevaluation of Discrepancy Between Assumed Sys Flow Rates & Actual Rates During Reactor Bldg Purges Identified Twelve Releases from 1977-80 Which Exceeded Tech Spec Limits (← links)
- 05000313/LER-1988-022, :on 881216,identified Discrepancy Which Resulted in Potential Impact on Environ Qualification of Plant.Caused by Failure to Properly Evaluate Changes in Svc Water Flow to DHR Coolers.Plan Developed (← links)
- 05000313/LER-1989-002-01, :on 890120,reactor Trip Occurred Due to Failure in Main Generator Exciter & Two Reactor Coolant Pumps Tripped on Undervoltage When Bus H1 Failed to Fast Transfer to Offsite Power.Caused by Arcing in Exciter (← links)
- 05000313/LER-1989-007-01, :on 890318,determined That Postulated Break in HPI Line Upstream of Hpi/Rcs Cold Leg Connection Could Constitute LOCA Not Enveloped by Plant Design Basis.Caused by Inadequate Design Change Process (← links)
- 05000313/LER-1989-031, :on 890829,unexpected Control Room Isolation & Actuation of Control Room Emergency Ventilation Sys Occurred.Cause Undetermined.Further Investigation Into Cause Will Be Conducted (← links)
- 05000313/LER-1988-027, :on 880422,containment Isolation Valve Inoperable.Caused by Lack of Documentation of Design Basis Info for Sys Piping Temp & Pressures in Original Plant Design.Design Change Package Developed (← links)
- 05000313/LER-1989-029, :on 890825,determined That Svc Water Sys Operating Procedure Allowed Operation of Sys in Configuration That Could Result in Sys Being Rendered Inoperable by Single Component Failure (← links)
- 05000313/LER-1989-004-01, :on 890120,high Pressure Injection Line Check Valve Failed to Reseat.Caused by Inadequate Design Change Process.Program of Visual Insp & NDEs Completed to Identify Any Sys Degradations Due to Thermal Stresses (← links)
- 05000313/LER-1989-027, :on 890821,DHR/LPI Train B Injection Valve Removed from Svc for Maint W/O Being Demonstrated.Caused by Personnel Error & Inoperable Emergency Diesel Generator. Operator Counseled & Memo Issued (← links)
- 05000313/LER-1989-030, :on 890824,fire Barrier Between Adjacent Emergency Diesel Generator Rooms Did Not Meet NFPA Code Re Protection Against Spread of Flammable Liquids.Caused by Fire Barrier Degradation.Barriers Modified (← links)
- 05000313/LER-1989-018, :on 890501,reactor Tripped & Inadvertently Jarred Turbine Control Panel Containing Mercoid Switches for Turbine Trip Functions.Caused by Caution Label Missing from Control Panel.Warning Placard Installed (← links)
- 05000313/LER-1989-026, :on 890627,four Tech Spec Fire Barriers Found Not Included in Fire Barrier Penetration Log & Omitted from Insp.Caused by Personnel Error.Fire Barrier Visual Insp Procedure & Penetration Log Revised (← links)
- 05000313/LER-1988-030, :on 890620,determined That Unacceptable Modeling Technique Used in Stress Calculations,Potentially Affecting Seismic Capabilities of Eccs.Mods of Affecting Piping Completed (← links)
- 05000313/LER-1988-020-01, :on 881103,nonsafety-related Ventilation Sys Affected Penetration Room Ventilation Sys Capability to Process Penetration Leakage Following Design Basis Accident. Caused by Failure to Assess Sys Impact (← links)
- 05000313/LER-1988-028, :on 880831,discovered That Piping Span Lengths Between Containment Bldg Penetrations & First Piping Supports Unacceptable.Caused by Inadequate Judgement of Original Designer.Piping Requalified (← links)
- 05000313/LER-1989-014, :on 890426 & 0504,control Room Emergency Ventilation Sys Automatically Actuated Nine Times as Result of Spiking of Radiation Monitor 2RE-8750-1.Detector Replaced & Bad Connection in Holder Repaired (← links)
- 05000313/LER-1989-016, :on 890414,noted That Firewater Deluge Valve for Emergency Diesel Generator Not Repaired Since Crack Fitting Identified in Oct 1988.On 890201,sys Inoperable While Attempting to Replace Fitting (← links)
- 05000313/LER-1989-013, :on 881025,anchor Support for Core Flood Tank (CFT) T2A Vent Line Not Seismically Qualified & Operability of CFT Could Not Be Assured.Caused by Missing Anchor Support.Anchor Support Modified (← links)
- 05000313/LER-1989-012, :on 890402,discovered That High Energy Line Break Door Covered,Resulting in Condition Outside Design Basis of Main Feedwater Line Break in Piping Penetration Room.Caused by Personnel Error.Cover Removed (← links)
- 05000313/LER-1989-017, :on 890420,discovered That Dhr/Low Pressure Injection Cooler Discharge Isolation Valves Not Tested Quarterly.Caused by Inadequate Mod Review Process.Provisions Made to Test Valves Every 3 Months (← links)
- 05000313/LER-1989-015, :on 861209,RCS Loop B Flow Transmitters Sensing Line Not Properly Supported.Cause Undetermined.Engineering Insp of Similar Components Conducted During 1R7 & Revealed No Other Discrepancies (← links)
- 05000313/LER-1989-025, :on 890623-0702,control Room Emergency Ventilation Sys Unexpectedly Activated Four Times.Caused by Induced Electrical Noise from Operation of Relays in Alarm Circuitry.Temp Instrumentation Repaired (← links)
- 05000313/LER-1989-009, :on 890224,control Room Emergency Ventilation Sys Unexpectedly Started.Cause Not Determined.Area in Vicinity of Chlorine Monitors Posted to Prohibit Use of Radios (← links)
- 05000313/LER-1989-003, :on 880907,determined That Floor Penetration Located in Fire Barrier at Elevation 335 of Auxiliary Bldg Sealed Using Unqualified styrofoam-type Matl.Caused by Personnel Error.Penetration Seals Repaired (← links)
- 05000313/LER-1988-024, :on 881219,DHR Sys Inboard Suction Valve Closed,Resulting in Loss of DHR Sys Flow.Caused by Inadvertent Jarring of Panel Housing Control Relays for Suction Valve.Caution Label Placed on Panel (← links)
- 05000313/LER-1989-021, :on 890601,inadvertent Main Steam Line Isolation Occurred During Maint.Caused by Defective Instrument Modules.Defective Modules Replaced & Affected Channels Tested (← links)
- 05000313/LER-1989-024, :on 890309,incorrect Trip Coil Installed in Power Supply Feeder Breaker for Motor Actuator for Emergency Feedwater Sys Train a Isolation Valve to Steam Generator B. Caused by Personnel Error.Plant Mod Improved (← links)
- 05000313/LER-1989-023, :on 890605,determined That Power Range Nuclear Instrumentation Calibr Required by Tech Specs Had Not Been Performed within Specified Frequency.Caused by Lack of Procedural Guidance.Procedure Revised (← links)
- 05000313/LER-1989-020, :on 890530,manual Actuation of Emergency Feedwater Pump Occurred.Caused by Tube Failures in Feedwater HX & Leaking B Startup Control Valve Which Necessitated Opening of Valve FW-8B.Tube Leaks Repaired (← links)
- 05000313/LER-1989-011, :Between 890326 & 0421,control Room Emergency Ventilation Sys (CREVS) Unexpectedly Automatically Actuated 13 Times.Caused by Spiking of Radiation Monitor & Inadequate Corrective Actions from Previous Events (← links)
- 05000313/LER-1989-010-01, :on 890516 & 17,daily RCS Unidentified Leakrate Determination Indicated That Leakage Increased from Previous Day.Root Cause Not Positively Know.Visual Insp Indicated Possibility of Pinhole.Reactor Shutdown (← links)
- 05000313/LER-1989-022, :on 890120,RCS Backleakage Occurred Through failed-open Check Valve Resulted in Design Temp of Hpis Piping Being Exceeded.Caused by Failure of Support Designer to Use Correct Load.New Support Replaced (← links)
- 05000313/LER-1989-019-01, :on 881209,emergency Feedwater Initiation & Control Sys Actuation Occurred on Indicated Low Water Level. Caused by Personnel Error.Memo Issued Describing Event & Recognition of Need for Valve Use Emphasized (← links)
- 05000313/LER-1989-005, :on 890201,calculated Reactor Shutdown Margins Less Conservative than Assumed in Design Basis.Caused by Personnel Error Resulting in Inadequate Procedure.Reactivity Balance Procedure Revised (← links)
- 05000313/LER-1988-026, :on 880706,certain Discrepancies Identified in Design Analyses & Assumptions Re Dhr/Low Pressure Injection & Core Flood Sys.Caused by Oversights by Various Design Groups Involved in Sys Design (← links)
- 05000313/LER-1989-019, :on 880517,discrepancies Identified in Piping Supports for HPI Sys Which Have Impacted Seismic Qualification.Caused by Deficiencies Resulting from 1979 Sys Mod Which Were Not Detected During Review (← links)
- 05000313/LER-1988-023, :on 881216,inadequate Work Controls Resulted in Nonisolable RCS Leak Necessitating Plant Shutdown.Caused by Inadequate Work Controls Under Existing Conditions.Work Control Improvements Being Addressed (← links)
- 05000313/LER-1989-006-01, :on 890209,analytical & Procedural Inadequacies Noted Re Use of Hpis in Piggyback Flowpath Alignment.Caused by Deficient ECCS Analysis.Affected Portions of Piggyback Piping Reanalyzed & Mods Implemented (← links)
- 05000313/LER-1987-003-01, :on 870808,emergency Feedwater Sys Actuation Occurred During Power Reduction.Caused by Main Feedwater Valve Fulcrum Pin Out of Position Due to Personnel Error.New Set Screws & Pin Installed (← links)
- 05000313/LER-1987-008, :on 871119,leakage Pathway for Unfiltered Air Identified in Control Room Emergency Ventilation Sys.Caused by Inadequate Design & Review of Mod to Sys in Mar 1977. Opening Sealed (← links)
- 05000313/LER-1998-003-03, :on 980716,concluded That Several Operators Had Not Maintained Active Status,Per 10CFR55.53(e).Caused by Misinterpretation of Regulations.Affected Individuals Were Required to Reactivate,Per 10CFR55.53(f) (← links)
- 05000313/LER-1987-007-01, :on 871106,discrepancy in Original Design of Penetration Room Ventilation Sys Identified.Caused by Failure to Apply Single Failure Criteria to Sys Design. Condition Corrected by Design Mod (← links)
- 05000313/LER-1987-006-01, :on 871103,discovered Penetration Room Ventilation Sys Surveillance Not Performed Prior to Establishing Reactor Bldg Integrity.Caused by Inadequate Procedural Guidance.Procedure to Be Revised (← links)
- 05000313/LER-1986-007, :on 861221,pressurizer Code Safety Valves Declared Inoperable Due to Incorrect Set Pressure.No Root Cause Could Be Determined.Valves Set Pressure Adjusted to Tech Specs Requirements (← links)
- 05000313/LER-1989-001, :on 881217,RCS Hot Leg Resistance Temp Detector Calibr Using Wrong Calibr Data Since Installation in May 1982.Caused by Procedural Inadequacy.Calibr Procedure for TE-1041/1042 Revised to Reflect Correct Calibr (← links)
- 05000313/LER-1988-009, :on 880922,three Inoperable Snubbers Discovered on safety-related Piping Sys.One Snubber Failed Due to Spec of Undersized Snubber & Other Two Found W/Inadequate Travel Remaining for Thermal Growth (← links)
- 05000313/LER-1988-015, :on 880928,increased Support Loads Identified on Two Hydraulic Snubbers HS-101 & HS-102 Attached to RCS Pressurizer Surge Line.Caused by Failure of NSSS Vendor to Include Appropriate Mass of RCS Fluid (← links)
- 05000313/LER-1988-018-01, :on 881208,subcritical Automatic Reactor Trip Occurred During Heatup & Pressurization.Caused by Operator Failure & Procedure Inadequacy.Procedure Changed (← links)
- 05000313/LER-1988-013, :on 880924,wire Discovered Terminated Incorrectly in 4,160-volt Ac Vital Power Supply Breaker Which Affected Automatic Starting Circuitry for HPI Pump. Cause Unknown.Wiring Error Corrected (← links)
- 05000313/LER-1988-017-01, :on 881112,discovered Svc Water Pump Suction Bay Lake Side Gate Leaking.Caused by Adjustment Gate Seating Surfaces & Loosening of Frame to Wall Mounting Bolts.Gates Repaired & Procedure Prepared (← links)
- 05000313/LER-1987-005-01, :on 870825,reactor Trip Occurred Due to Failure of One Phase of Breaker 5118.Caused by Relay Personnel Forgetting to Pull Breaker Failure Module.Maint & Testing Performed & Procedures Under Evaluation (← links)
- 05000313/LER-1987-004, :on 870815,reactor Trip & Emergency Feedwater Actuation Occurred During Power Ascension Due to Main Feedwater Pumps Control Sys Problems.Caused by Placing Pump in Automatic Control at Power Level Too Low (← links)
- 05000313/LER-1997-003-03, :on 970708,inadvertent Automatic Actuation of EFW Sys Occurred.Caused by Tripping of EFIC Channel D Power Supplies Coincidental W/Loss of FW Pumps.Rps Testing Secured & All Trips Reset (← links)
- 05000313/LER-1999-313, :on 990911,AI of EFWS Occurred During Plant Shutdown as Result of Securing Running RCPs Due to Reverse Rotation of Idle Pump.Caused by Failure of Motor anti-rotation Device.Device Was Replaced.With (← links)
- 05000313/LER-1997-001, :on 970408,inconsistencies Between Once Through SG Tube Destructive Examination Were Noted.Caused by Morphology Differences Between Flaws Used to Develop Sizing Technique.Discretion Was Verbally Approved (← links)
- 05000313/LER-1987-002-01, :on 870516,problems Encountered W/Main Turbine electro-hydraulic Control During Electrical Storm.Caused by Defective Analog Comparator Card.On 870517,turbine Tripped Upon Insertion of New Card.Plant Stabilized (← links)
- 05000313/LER-1986-006-02, :on 861023,corrosion of RCS Nozzle & Adjacent Cold Leg Piping Discovered.Caused by RCS Leakage from HPI Manual Isolation Valve MU-45A.Damaged Areas Repaired by Weld Buildup (← links)
- 05000313/LER-1987-001-01, :on 740521,four Seismic Supports Not Installed During Initial Const.Caused by Inadequate Coordination Between Design & Installation Groups.Supports Installed During Latest Refueling Outage (← links)
- 05000313/LER-1986-005-01, :on 860612,discovered Existence of Unsealed Conduits Between Manholes 1MH05 & 1MH06 Since 841205.Caused by Apparent Oversight of Conduits During Design Change Preparation & Inadequate Insp.Conduits Capped (← links)
- 05000313/LER-1999-002-04, :on 990706,TS Allowable Outage Time for One EDG Was Exceeded Due to Idler Gear Stub Shaft Bracket Bolting Failure.Caused by Loss of Bolt pre-load.Installed New Modified Idler Stub Shaft Assembly.With (← links)
- 05000313/LER-1986-008-01, :on 861231,reactor Tripped on High RCS Pressure from 25% Power.Caused by Reduction of Feedwater During Troubleshooting of Integrated Control Sys.Module in RCS Average Temp Correction Circuitry Replaced (← links)
- 05000313/LER-1992-004-03, :on 920515,discovered That TS Required Post Maint Test for Containment Isolation Valve Not Performed Prior to Heatup/Startup from Outage on 920504.Caused by Faulty Work Process.Action Team Formed (← links)
- 05000313/LER-1986-007-01, :on 861221,set Pressure Verification Tests Showed Pressurizer Code Safety Valves PSV-1001 & PSV-1002 W/ Incorrect Settings.Root Cause of Event Under Investigation. Valve PSV-1001 Adjusted & Other Valve Replaced (← links)
- 05000313/LER-1985-009-01, :on 841127,mechanical Shock Suppressor Failed During Inservice Insp Surveillance Functional Testing.Caused by Prolonged Exposure to Vibration & Heat.Failed or Degraded Snubbers Repaired or Replaced (← links)
- 05000313/LER-1988-007-01, :on 880906,radioactive Liquid Effluent Release Concentration on 880905 in Excess of Tech Spec Limits Identified.Caused by Personnel Error.Procedures Re Releases Will Be Clarified (← links)
- 05000313/LER-1978-024-03, /03L-0:on 780916,control Rod Driveline Breaker a Failed to Trip Upon Reactor Trip.Cause Not Given.Breaker Tripped Manually.Minor Adjustments Made to Breaker.Breaker Subsequently Tested Successfully (← links)
- 05000313/LER-1978-023-01, /01T-0:on 780925,during Surveillance Test,Control Rod Driveline Breaker a Failed to Trip on First Attempt. Caused by Trip Mechanism Mechanical Arm Being Out of Adjustment.Arm Adjustment Corrected (← links)
- 05000313/LER-1997-005-04, :on 971022,surveillance Testing Did Not Verify That Valve Would Close Upon Receiving Es Signal.Caused by Deficiency in Development of Original Tp.Testing W/Special Work Plan Verified CV-3643 Was Operable (← links)
- 05000313/LER-1997-004-04, :on 971021,two Remotely Operated Reactor Bldg Isolation Valves Were Not Tested as Required.Caused by Misinterpretation of TS Surveillance requirements.SV-1440 & SV-1443 Were Successfully Stroke Tested (← links)
- 05000313/LER-1986-004, :on 860408,reactor Tripped on High RCS Pressure from 82% Power Following Secondary Sys Transient Due to Turbine Electrohydraulic Control Sys Malfunction. Caused by Lightning Strike Due to Grounding (← links)
- 05000313/LER-1997-001-01, :on 970408,inconsistencies Between Once Through SG Tube Destructive Exam Results & Intergranular Attack Flaw Sizing Qualification Data Was Discovered.Caused by Incorrect Data Sets.Both OTSGs Declared Inoperable (← links)
- 05000313/LER-1999-001-04, :on 990521,automatic Actuation of CREVS Occurred Due to Higher than Normal Radiation at Detector When Radioactive Filter Was Moved in Adjacent Area.Training Has Been Provided to Personnel.With (← links)
- 05000313/LER-1988-006-01, :on 880406,potential Degradation of Environ Boundary Seal on Rosemount Instrumentation Transmitters Discovered.Cause Not Conclusively Determined But Rotation of Sensor Modules Suspected.Part 21 Related (← links)
- 05000313/LER-1988-005-01, :on 880209,outside Reactor Bldg Isolation Valve SS-146 for once-through Steam Generator Secondary Sampling Sys Piping Penetration Maintained in Open Position.Caused by Inadequate Controls for Valve.Valve Closed (← links)
- 05000313/LER-1985-012, :on 851121,plug Found Installed in Place of Fusible Sprinkler Head in Lower South Electrical Penetration Room.Caused by Failure of Personnel to Maintain Test Control.Plug Replaced W/Fusible Sprinkler Head (← links)
- 05000313/LER-1988-004, :on 880210,reactor Bldg Hydrogen Concentration Instrument Observed Inoperable During Operability Verification Test.Caused by Wires Not Terminated on Correct Terminal Block Locations.Wiring Corrected (← links)
- 05000313/LER-1988-002, :on 871022,anchor Bolts for Upper North Base Plate of Instrumentation Rack R-02 Found to Be Loose & Pulling Out of Wall.Caused by Insufficient Guidance to Field Personnel During Const.Bolts Replaced (← links)
- 05000313/LER-1988-001-01, :on 850506,discovered Incorrectly Configured Target Rock Solenoid Operated Valves.On 880125 Discovered That Valve Still Incorrectly Configured.Caused by Failure to Recognize Valve Directional Characteristics (← links)
- 05000313/LER-1988-003, :on 880217,reactor Tripped on Low RCS Pressure. Caused by Unplanned Regulating Rod Group Insertion. Programmer for Group 7 Replaced,Temporary Mod Installed & Drive Clutch Adjustment Made to CV-2625 (← links)
- 05000313/LER-1978-027-03, /03L-0:on 780926,condensate Storage Tank Level Dropped Below Min Tech Spec Level.Caused by Abnormally High Condensate Demand Due to Simultaneous Rinsing of Polisher & Makeup Plant Plus Makeup to Hotwell (← links)
- 05000313/LER-1978-026-03, /03L-0:on 780926,normal Borated Water Storage Tank Chemical Sample Showed Boron Concentration Below Tech Spec Limits.Cause Not Given.Concentration Raised to Tech Spec Requirements (← links)
- 05000313/LER-1978-025-03, /03L-0:on 780917,control Rod Index Reached Restricted Zone W/Worst Case Condition at 171% Withdrawn at 90% Power.Caused by Miscalculated Boron Addition to Rcs. Acceptable Rod Positions Obtained within 2 H (← links)
- 05000313/LER-1978-028-03, /03L-0:on 780929,leak Developed in Casing Drain Line from Discharge of Makeup Pump P36C Upstream of Valve ABD-9C.Caused by Crack in Pipe Nipple Threaded Into Pump Casing Due to Apparent Overstressing in Installation (← links)
- 05000313/LER-1978-030-03, /03L-0:on 781121,borated Water Storage Tank Boron Concentration Fell Below Tech Specs Limit.Caused by Open Condensate Valve CS-38.Valve Closed Increasing Boron Concentration (← links)
- 05000313/LER-1978-030, Forwards LER 78-030/03L-0 (← links)
- 05000313/LER-1997-002-02, :on 970418,four ROs Did Not Have Required Corrective Eyewear for Use W/Self Contained Breathing Apparatus Readily Available.Caused by Inadequate Procedural Guidance.Operations Procedures Revised (← links)
- 05000313/LER-1996-002, :on 970519,surveillance Tests Required by TS Were Incomplete Because All Combinations of Contacts Not Tested Due to Procedure Deficiencies.Verified Operability of RPS (← links)
- 05000313/LER-1997-001-03, :on 970408,inconsistencies Between OTSG Tube Destructive Exam Results & Iga Flaw Sizing Qualification Data Caused Possibility That Tubes Were Left in Svc.Otsgs Declared Inoperable (← links)
- 05000313/LER-1986-003, :on 850724,discovered Unsealed Openings in Ceiling of Control Room.On 860103,discovered Opening at ceiling-to-wall Interface in Control Room.On 860120, Discovered Gap in ceiling-to-wall Intersection (← links)
- 05000313/LER-1985-012-01, :on 851121,fusible Sprinkler Head Discovered Missing from Lower South Cable Penetration Room.Cause Not Stated.Fusible Sprinkler Head Installed & Fire Suppression Sys Returned to Normal Operation (← links)
- 05000313/LER-1985-011, :on 851001,manual Reactor Trip Occurred on Inadvertent Closure of Main Steam Block Valve.Caused by Loose Relay Cover Resulting from Wiring Terminations to Relays.Wiring Corrected (← links)
- 05000313/LER-1985-007-01, :on 850811,reactor Trip Occurred When High Thrust Bearing Wear Indication Caused Main Feedwater Pump (P-1B) Trip.Pumps Modified to Include Metering Valves to Mitigate Spurious Indications (← links)
- 05000313/LER-1996-006, :on 960527,EDGs Were Declared Inoperable Due to Excessive Water in Fuel Oil Sys.Drained,Cleaned & Inspected T-25,increased Height of Nozzles in T-25 by Six Inches & Revised Sampling Procedures (← links)
- 05000313/LER-1996-009-02, :on 961017,discovered Fire in Reactor Bldg. Caused by Cracked Weld in Oil Line on Reactor Coolant Pump Motor.Extinguished Fire,Replaced Damaged Insulation & Repaired Cracked Weld (← links)
- 05000313/LER-1996-007-02, :on 960912,automatic Reactor Trip & Emergency Feedwater Sys Actuation Occurred When Two RCP Motors de-energized.Caused by Defective Fuse in Electrical Bus Undervoltage Circuit.Fuse Replaced (← links)
- 05000313/LER-1985-010-01, :on 850902,reactor Trip Resulting from Trip of Main Feedwater Pump B Occurred.Caused by Broken Speed Control Governor Drive Shaft.Governor Shaft & Drive Shaft Replaced (← links)
- 05000313/LER-1985-006-01, :on 850619,determined That Monthly Channel Functional Test of high-range Containment Monitors Not Performed Since 850131.Caused by Misunderstanding Re Amend Status.Improved Tracking of Amends Stressed (← links)
- 05000313/LER-1985-008-02, :on 850819,speed of Main Feedwater Pump (P-18) Increased & Then Tripped in Overspeed.Caused by Loose Screw on Turbine Speed Control Governor Drive Shaft Wearing Drive Shaft Coupling.Parts Replaced (← links)
- 05000313/LER-1996-010-02, :on 961119,failed to Test Reactor Protection Sys (RPS) High Temp Trip Function.Caused by Inadequate Procedure Rev.Declared RPS Inoperable,Revised RPS Test Procedures & Tested All Four Channels (← links)
- 05000313/LER-1985-005, :on 850602,anticipatory Reactor Trip Occurred on Loss of Both Main Feedwater Pump Signals.Caused When cross-connect Valve Closed While Recirculation Valve Open. Operating Procedures Revised (← links)
- 05000313/LER-1985-004-01, :on 850531,intercept Valves Closed & Feedwater Pump Tripped,Causing Reactor Trip.Faulty Connection Caused Close Signal & Spurious Vacuum Trip Signal,Resulting in Pump Trip.Disconnects Realigned (← links)
- 05000313/LER-1985-003-01, :on 850409,reactor Trip Occurred Due to High RCS Pressure as Result of Loss of Main Feedwater Pump A. Caused by Failure of Delta T Cold Control Circuit & Relay Module in Integrated Control Sys (← links)
- 05000313/LER-1992-006-02, :on 920826,inadvertent Actuation of CR Emergency Ventilation Sys Occurred Due to Invalid Radiation Monitor Trip.Caused by Undesirable Pulse on Output of Level Amplifier.Circuit Card Replaced (← links)
- 05000313/LER-1996-006-02, :on 960527,both Emergency Diesel Generators Declared Inoperable.Caused by Excessive Water in Fuel Oil Sys.Drained,Cleaned & Inspected Bulk Storage Tank T-25 and Increased Height of T-25 Nozzles by Six Inches (← links)
- 05000313/LER-1996-005-02, :on 960519,automatic Reactor Trip on High RCS Pressure Occurred.Caused by Component Failure in a MFW Pump Control Sys.Failed Speed Sensor Replaced (← links)
- 05000313/LER-1985-002-01, :on 850129,reactor Trip Occurred.Caused by Inadvertent Isolation of Flow Instrumentation.Instrument Isolation Valve Replaced & Sensing Root Valves Properly Labeled (← links)
- 05000313/LER-1996-004-02, :on 960306,determined That Tech Spec Violation Occurred When Crane Load in Excess of 2,000 Lb Positioned Briefly Over Fuel Stored in Spent Fuel Pool. Caused by Inadequate Procedures (← links)
- 05000313/LER-1984-005-01, :on 841005,automatic Reactor Trip Occurred Due to Loss of Power to Two Reactor Coolant Pumps.Caused by Janitor Accidentally Bumping Handswitch on Feeder Breaker from Unit Auxiliary Transformer (← links)
- 05000313/LER-1982-005-03, /03X-1:on 820227,diesel Generator 2 Failed to Start During Monthly Surveillance Test.Caused by Turbocharger Failure Due to Failed Compressor Bearing,Thrust Bearing & Seals.Turbocharger Replaced (← links)
- 05000313/LER-1996-002-03, :on 960308,discovered That Surveillance Tests Required by TS Incomplete Because All Combinations of RPS Channel Trip Relay Contacts Not Tested Due to Procedural Deficiency.Verified Operability of RPS (← links)
- 05000313/LER-1996-003-02, :on 960313,charcoal Filter Sample Analysis Was Not Conducted in Accordance W/Literal Requirements of TS as Result of Misinterpretation of Requirements Necessary to Achieve Compliance W/Specs.Revised Procedures (← links)
- 05000313/LER-1996-001-04, :on 960213,reactor Bldg Filtration Sys Surveillance Testing Occurred.Caused by Misinterpretation of Requirements.Appropriate Procedure Revised (← links)
- 05000313/LER-1984-006-01, :on 841029,engineering Evaluation of Hydrogen Purge Sys Using LOCA Conditions Revealed Potential for Degradation of Reactor Bldg Liner Plate.Cause Not Stated. Piping Supports Will Be Modified (← links)
- 05000313/LER-1992-005, :on 920519,steam Driven EFW Pump P-7A Was Inoperable.Caused by Improper Pump Setup & Inadequate Procedural Guidance.Efw Pump Maintenance Procedure Revised (← links)
- 05000313/LER-1992-002-02, :on 920421,discovered That Seismic Category II Scaffolding Storage Rack Could Have Rendered One Channel of TS-related Instrumentation Inoperable.Caused by Inadequate Configuration Control.Barrier Installed (← links)
- 05000313/LER-1992-003-01, :on 920424,during Plant Heatup,Automatic Initiation of EFW Occurred.Caused by Securing Running Reactor Coolant Pumps Due to Reverse Rotation of Idle Pump. Procedures Will Be Revised (← links)
- 05000313/LER-1992-001-02, :on 920408,deficiency W/Circuit Breaker Coordination Discovered.Caused by Inadequacies in Original design.D01 & D02 Circuit Breakers Supplying Panels D11,D21, RA1 & RA2 Replaced W/Fuses (← links)
- 05000313/LER-1991-010, :on 911005,determined That During Peak Summertime Load conditions,161 Kv Offsite Power Source May Be Unable to Maintain Adequate Voltage.Caused by Lack of Formal Procedure.New Guidance Implemented (← links)
- 05000313/LER-1980-014-03, /03X-1:on 800415,fire & Smoke Detector Testing Not Completed within Surveillance Interval Due to High Radiation Level.Detectors Tested at Cold Shutdown.Tech Spec 4.19 Revised (← links)
- 05000313/LER-1980-040-99, /99X-1:on 801001,emergency Hatch Local Leak Rate Test Connections Found Uncapped,Causing Outer Door to Be Bypassed by 3/4-inch Connection.Cause Not Stated.Caps Replaced & Test Procedures Revised (← links)
- 05000313/LER-1995-010-01, :on 950904,failed to Establish Alternate Radioactive Gaseous Effluent Sampling within One H Due to Lack of Guidance Re Prioritization for Restoration of Sampling Capability.Inspected Equipment (← links)
- 05000313/LER-1982-028-03, /03X-1:on 840909,diesel Driven Fire Pump P-6B Failed to Start When Using Battery Bank B.Caused by Normal end-of-svc Life.Battery Bank B Replaced on 820911 & Periodic Electrical Test Procedure Revised (← links)
- 05000313/LER-1991-013-03, :on 911113,automatic Actuation of Control Room Ventilation Sys Initiated Due to Valid Radiation Signal. Caused by Leakage from Letdown Filter Drain Valve. Penetration Room Exhaust Sys Placed in Svc (← links)
- 05000313/LER-1991-012-02, :on 911111,actuation of CR Emergency Ventilation Sys Occurred During Maint on Radwaste Area Exhaust Ventilation Sys.Caused by Failure to Identify Potential Input Sources.Procedures Revised (← links)
- 05000313/LER-1982-030-01, /01X-2:on 821214,eddy Current Testing Revealed Five Tubes W/Greater than or Equal to 40% through-wall Indications.Insp Expanded to Determine Boundary of Defects. Detailed Info Will Be Submitted Following Insp (← links)
- 05000313/LER-1984-004-01, :on 840421,alarm Came in for Thrust Bearing Wear on Main Feedwater Pump Turbine K-2A.Caused by Personnel Error.Alarm/Trip Circuitry & Instrumentation Calibr & Associated Circuitry Returned to Svc (← links)
- 05000313/LER-1995-009, :on 950715,automatic Reactor Trip Initiated by RPS on High RCS Pressure Resulting in Automatic Closure of Main Turbine Governor & Intercept Valves Due to Failure of Main Generator Output Circuit Breaker (← links)
- 05000313/LER-1991-008-01, :on 910828,determined That Certain Safety Related Instruments Not Seismically Qualified & on 910827, Identified Instrument Modules W/O Vibration Dampening Matl. Necessary Repairs Accomplished (← links)
- 05000313/LER-1991-011-03, :on 911009,discovered That Approx 1 Cup of Oil Per Minute Flowing from Outboard Pump Bearing Area & on Pump P36C.Caused by Lack of Procedures for Adjustment of Lube Oil Control Valves.Lube Oil Sys Adjusted (← links)
- 05000313/LER-1991-010-03, :on 911005,discovered That Offsite Power Source May Be Unable to Maintain Adequate Voltage to Safety Loads During Accident Conditions.Caused by Increased Offsite Grid Loading.Procedural Guidance Implemented (← links)
- 05000313/LER-1995-008, :on 950514,cooling Fan Associated W/Green Train of RB Emergency Cooling Sys Tripped Due to Failure of Drive End Thrust Bearing of Fan Motor.New Motor Ordered for Subj Fan & Will Be Installed Upon Receipt (← links)
- 05000313/LER-1995-007, :on 950331,failed to Complete Required TS Surveillance Logs as Result of Inadequate Communication During Turnover of Logtaking Responsibilities.Disciplinary Action Administered to Individuals Involved (← links)
- 05000313/LER-1991-013, :on 901026,determined Safety Re Svc Water Return Piping Located in Close Proximity to MFW Line from a Train Pump.Caused by Inadequate Design.Design Change Initiated & Check Valve Relocated to Position (← links)
- 05000313/LER-1995-006, :on 950423,TS Required Daily Battery Surveillance Test Had Not Been Performed.Caused by Personnel Error.Survey Surveillance Checks by Operations Crew Added as Method of Assuring Completion (← links)
- 05000313/LER-1984-003-01, :on 840328,three RCS Pressure Transmitters Found Out of Tolerance in Nonconservative Direction.Caused by Transmitter Drift.Instruments Calibr within Acceptable Tolerances (← links)
- 05000313/LER-1984-001-01, :on 840321,during Scheduled mid-cycle Outage, Pressurizer Spray Line Snubber Failed to Meet Lock Up Test Acceptance Criteria.Cause Undetermined.Equipment Refurbished,Retested & Returned to Svc (← links)
- 05000313/LER-1984-002-01, :on 840316,reactor Tripped During Reactor Protective Sys Anticipatory Trip,Resulting in Loss of Both Main Feedwater Pumps.Possibly Caused by Clogged Oil Filters. Filters Changed (← links)
- 05000313/LER-1983-028-03, /03L-0:on 831130,during Radwaste Processing,Crack Discovered in Discharge Piping of Clean Waste Transfer Pump P-47B.Probably Caused by Overheating of Pipe During Installation of Valve Along W/Piping Stresses (← links)
- 05000313/LER-1983-029-03, /03L-0:on 831129,bottoms of Carbon Filter for Penetration Room Ventilation Fans Found Wet.Caused by Water from Hydrogen Purge Sys Carried Over Into Plant Vent During Hydrogen Purge Sys Operation.Filters Replaced (← links)
- 05000313/LER-1991-008-03, :on 910827,several Instrument Modules Noted W/O Vibration Dampening Matl or Module Guide Rails Installed on Foxboro Spec 200 Cabinets.Caused by Obsure Vendor Info. Training Module Will Be Developed (← links)
- 05000313/LER-1983-026-01, /01T-0:on 831118,review Revealed Fuel Oil Analysis for 830607 Did Not Meet Tech Spec Requirements.Caused by Personnel Failure to Recognize out-of-spec Condition & Place Plant in Limiting Condition for Operation (← links)
- 05000313/LER-1995-004-01, :on 950403,vendor Personnel Error in Programming Upgraded MFP Turbine Controller Resulted in Manual RT & Automatic Efs Actuation.Corrected Programming Errors (← links)
- 05000313/LER-1995-003-01, :on 950320,determined That Required Number of Radiological Environ Milk Samples Not Collected Due to Incorrect Interpretation of Ts.Dairy Approx Nine Miles from ANO Located & Began Providing Milk Samples (← links)
- 05000313/LER-1995-002, :on 950304,discovered That Leakage from Valve in Line from SW Return Header to Discharge Flume Would Have Resulted in Reduction of Required Inventory of ECP Following Dba.Seat of CV-3824 Repaired (← links)
- 05000313/LER-1983-022-03, /03L-0:on 831013,as-found Voltage of 2.06 for Station Battery D07,cell 34,did Not Meet Required 2.13 Volts.Cause Not Determined.Battery Placed on Equalizing Charge (← links)
- 05000313/LER-1991-006-02, :on 910530,automatic Actuation of Control Room Emergency Ventilation Sys Occurred as Result of Spurious Trip of Radiation Monitor RE-8001.Caused by Setpoint Error. Min Value for Setpoint Established (← links)
- 05000313/LER-1991-005-02, :on 910521,automatic Reactor Trip on Loss of Main Feedwater Occurred.Caused by Inadequate Procedural Guidance Re cross-tie of Electrical Load Ctrs.Personnel Involved Counseled (← links)
- 05000313/LER-1983-021-03, /03L-0:on 830909,during Surveillance Test on Reactor Bldg Fire Sprinkler Sys,Discovered Wiring Discrepancy.Caused by Erroneous Terminations Since Plant Const.Valve Wiring Terminated (← links)
- 05000313/LER-1983-020-03, /03L-0:on 830828,lead Hydrogen Purge Fan VEF-37A Indicated Low Output Flow.Caused by Debris Collected at Valve HPA-133.Valve Internals Cleaned (← links)
- 05000313/LER-1983-019-01, /01T-0:on 830907,during Investigation to Determine Source of High RCS Leakage,Crack Discovered in pipe-to-flange Weld on Pump Casing Vent on Reactor Coolant Pump C (← links)
- 05000313/LER-1991-009-03, :on 911003,discovered That 480-volt Ac ESF Load Ctrs 2B5 & 2B6 Not in Seismically Qualified Configuration & Support Rails Not Secured in Place.Caused by Insufficient Design Review.Rails Removed (← links)
- 05000313/LER-1991-002, :on 910410,inadvertent Actuation of Combined Control Room Emergency Ventilation Sys Occurred Due to Invalid Unit 2 Radiation Monitor Trip.Caused by Noise Spike. Method for Determining Setpoint Developed (← links)
- 05000313/LER-1995-001-01, :on 950127,nonconstructive Input of CFT Initial Conditions & Nonconstructive Data Handling by Computer Codes Occurred,Due to Human Error & Use of Unsophisticated Codes. Steps Initiated to Reduce LOCA Alarm Limits (← links)
- 05000313/LER-1983-024-03, /03L-0:on 830926,control Rod Assembly 10 Found Misaligned from Group Average by Greater than 9 Inches. Caused by Pole Slippage on Out Command.Control Rod Drive Malfunction Procedure Will Be Revised (← links)
- 05000313/LER-1983-025-03, /03L-0:on 831001,acceptable Sample Flow Criteria Not Met for Reactor Bldg Hydrogen Sampling Standby Purge Sys Test.Caused by Switch on Conductivity Analyzer in Off Position (← links)
- 05000313/LER-1994-004-04, :on 940804,ANO Sys Engineering Personnel Determined That Functional Test Procedure for Reactor Bldg H Analyzers Was Not Adequate to Alert Personnel of Blocked Analyzer Outlet Flowpath Due to Personnel Oversight (← links)
- 05000313/LER-1994-003-04, :on 941008,surveillance Testing of Some Engineered Safeguards Components Did Not Verify Operability as Required by Ts,Due to Procedural Deficiencies Resulting from Inadequate Definition of Testing Requirements (← links)
- 05000313/LER-1994-003, :on 941008,tested Surveillance of Some Engineered Safeguards Components Did Not Verify Operability as Required by TS Due to Procedural Deficiencies.Existing Testing Program Evaluated (← links)
- 05000313/LER-1983-018-03, /03L-0:on 830726,emergency Feedwater Bypass Valve CV-2626 to Steam Generator B Failed to Open from Control Room During Surveillance Test.Caused by Failure of Interlock Contact Preventing Reverse Contactor to Open (← links)
- 05000313/LER-1991-004-02, :on 910502,inadvertent Actuation of Control Room Emergency Ventilation Sys Occurred Due to Chlorine Monitor Trip.Caused by Personnel Error.Personnel Involved Counseled & Protective Covers Added (← links)
- 05000313/LER-1983-012-03, /03L-0:on 830519,w/plant Heatup/Startup in Progress,Auxiliary Feedwater Pump P-75 Outboard Mechanical Seal Failed.Cause Unknown.Seal Rebuilt & Reinstalled (← links)
- 05000313/LER-1991-007-02, :on 910614,during Insp,Fuse Discovered Inadequate.Caused by Design Inadequacies.Firewatches Posted in Areas of Common Vulnerability & Fuses for Emergency Batteries Replaced (← links)
- 05000313/LER-1983-005-03, /03L-0:on 830328,motors for Svc Water Pumps P-4B & P-4C Observed to Have Upper Oil Reservoir Piping Altered. Caused by Installation of Oil Drain to Facilitate Draining Oil from Upper Oil Reservoir (← links)
- 05000313/LER-1983-009-03, /03L-0:on 830405,during Hot Shutdown After Refueling Outage,Discovered That Nonqualified Diaphragm Was Used to Repair Pressure Switch PS-7503 in Standby Hydrogen Purge Sys.Qualified Pressure Switch Obtained & Installed (← links)
- 05000313/LER-1991-001, :on 910110,automatic Reactor Trip Occurred Due to Main Turbine Trip.Caused by Failure of Turbine Generator Exciter.Strengthened Controls Implemented During Permanent Exciter Installation (← links)
- 05000313/LER-1983-007-03, /03L-0:on 830308,during Performance of Reactor Protection Sys Channel D Calibr,Reactor Bldg Pressure Switch PS-2403 Found Out of Tolerance.Caused by Instrument Drift. Switch Reset Per Reactor Protection Sys Procedure (← links)
- 05000313/LER-1983-014-03, /03L-0:on 830609,auxiliary Feedwater Pump P-75 Rendered Inoperable.Caused by Supply Piping Seal Break Due to Piping Misalignment.Piping Replaced & Realigned to Reduce Stress (← links)
- 05000313/LER-1983-015-03, /03L-0:on 830616,while in Hot Shutdown After Reactor Trip,Hpi Control Valve CV-1219 Failed to Open on Demand from Control Room.Cause Not Determined.Operator & Switches Inspected & Switch Settings Checked (← links)
- 05000313/LER-1983-004-03, /03L-0:on 830214,RCS Pressure Transmitters PT-1040 & PT-1020 Found Out of Tolerance.Caused by Transmitter Drift.Transmitter Recalibr & Left within Allowable Tolerance (← links)
- 05000313/LER-1983-013-03, /03L-0:on 830520,while Raising Steam Generator Level for Wet Layup,Emergency Feedwater Pump P-7B Indicated Flow Appeared Degraded.Caused by Cavitation at High Flows from Suction Fouling Due to Lodged Glove (← links)
- 05000313/LER-1990-011, :on 900930,inadvertent Actuation of Control Room Emergency Ventilation Sys Initiated by Trip of Chlorine Monitor.Caused by Radio Frequency Interference.Area Posted to Prohibit Radios (← links)
- 05000313/LER-1994-002-03, :on 940411,reactor Automatically Tripped.Caused by Over Voltage Condition.Power Restored to EFIC Channel of B & D by Opening Breaker for Channel & Allowing Protective Devices to Reset (← links)
- 05000313/LER-1982-024-03, /03L-0:on 821104,at 68% Power,Control Rod Drive B Ac Breaker Failed to Trip.Caused by Latch Adjusting Screw Being Improperly Adjusted.Breaker Replaced (← links)
- 05000313/LER-1990-017-02, :on 901207,inadvertent Automatic Start of DHR Low Pressure Injection Pump Occurred During Testing.Caused by Personnel Error.Event Discussed W/Electrical Maint Personnel (← links)
- 05000313/LER-1990-018-02, :on 901201,discovered Airlocks Not Being Local Leak Rate Tested Correctly.Caused by Previous Organizational Weaknesses.Plant Mod Implemented to Remove Pressure Gauges & to Cap Penetrations Through Airlock Bulkheads (← links)
- 05000313/LER-1983-008-03, /03L-0:on 830327,lead Hydrogen Exhaust Fan USF-30A Failed to Attain Sufficient Flow.Caused by Oxidation in Pressure Control Valve PCV-7447 Due to Water in Hydrogen Purge Sys.Valve Disassembled & Corroded Components Replaced (← links)
- 05000313/LER-1983-006-03, /03L-0:on 830321,reactor Coolant Pressure Transmitter PT-1023 Found to Be Out of Tolerance During Reactor Protective Sys Channel B Calibr.Caused by Instrument Drift.All Reactor Coolant Pressure Instrumentation Calibr (← links)
- 05000313/LER-1991-001-01, :on 910110,automatic Reactor Trip Occurred as Result of Main Turbine Tripping Due to Loss of Field Excitation to Main Generator.Cause Under Investigation. Temporary Exciter Installed (← links)
- 05000313/LER-1990-022-02, :on 901218,reactor Trip Initiated by RPS During Plant Heatup While Shifting Reactor Coolant Pumps.Caused by Personnel Error & Inadequate Operating Procedure.Crew Briefing Held.Procedures to Be Revised (← links)
- 05000313/LER-1990-019-03, :on 901209,inadvertent Actuation of Control Room Emergency Ventilation Sys Occurred Due to Spurious Trip of Radiation Monitor.Caused by Unsoldered Connection Due to Mfg/Production Defect.Connection Repaired (← links)
- 05000313/LER-1990-020-02, :on 901030,potential for Structural Damage or Failure of Containment Polar Crane During Design Basis Conditions Discovered.Caused by Oversight of A/E During Const.Design Modified (← links)
- 05000313/LER-1990-016-03, :on 901127,reactor Protection Sys & Emergency Feedwater Initiation & Control Sys Setpoints Not Calibr,Per Tech Specs Requirements.Caused by Personnel Error (← links)
- 05000313/LER-1990-001-01, :on 900228,loss of Reactor Bldg Integrity Occurred Due to Combined Effect of Svc Water Cooling Coil Leak on Reactor Bldg Cooler.Caused by Localized Corrosion Pitting Mechanism.Blind Flanges Installed (← links)
- 05000313/LER-1990-014-02, :on 901030,inadvertent Actuation of Control Room Emergency Ventilation Sys Occurred (← links)
- 05000313/LER-1990-013-02, :on 901026,discovered That Location of safety- Related Svc Water Piping in Close Proximity to High Energy Main Feedwater Line (← links)
- 05000313/LER-1990-015-01, :on 901026,irradiated Fuel Handling Operations Commenced W/Greater than Tech Specs Allowed (← links)
- 05000313/LER-1990-010-02, :on 900915,determined That Check Valves Located in Air Supply Sys to Dampers Used for Isolation of ANO-1 Ventilation Sys Not Previously Tested (← links)
- 05000313/LER-1982-019-03, /03L-0:on 820817,condensate Storage Tank T-41 Level Decreased Below Tech Spec Limit of 16.3 Ft.Caused by Abnormally High Condensate Demand Due to end-of-cyle Dilution,Boiler Startup & Multiple Regenerations (← links)
- 05000313/LER-1990-009-01, :on 900819,inadvertent Actuation of Control Room Emergency Ventilation Sys Occurred.Caused by Faulty Cable/Connector Assembly for Radiation Monitor,Resulting in Grounding of Cable Conductor.Repair Initiated (← links)
- 05000313/LER-1982-025-03, /03L-0:on 820828,electrical Jumpers Discovered Across Trip Contacts of Shutdown Bypass High Pressure Trip Bistables for a & D Reactor Protection Sys Channels.Caused by Personnel Error.Jumpers Removed (← links)
- 05000313/LER-1982-026-03, /03L-0:on 820901,installed Hose Reel (HR-49) Found Not Visually Inspected Per Tech Specs.Caused by Lack of Communication,Leading to Omission of HR-49 from Insp procedures.HR-49 Inspected & Procedure Revised (← links)
- 05000313/LER-1982-027-03, /03L-0:on 820714,RCS Leak Rate Calculated at 3.4 Gpm,In Excess of Tech Spec.Caused by Low Breakway Torque Valves,Deteriorated Gasket & Eroded Manway Cover.All Defective Parts Repaired or Replaced (← links)
- 05000313/LER-1982-021-03, /03L-0:on 820808,while in Heatup W/Rcs at 458 F, RCS Leakage Increased to Approx 28 Gpm Due to Failure of Reactor Coolant Pump C Seal.Cause of Seal Failure Not Determined.Seal Improvement Program Underway (← links)
- 05000313/LER-1994-001-03, :on 940201,inoperable Emergency Feedwater Sys Flowpath Occurred.Caused by Operators Inattention to Detail While Taking & Reviewing Logs.Operations Shift Mgt & Crew Meeting to Discuss Lessons Learned from Event (← links)
- 05000313/LER-1982-020-03, /03L-0:on 820805,while at 100% Full Power,Control Rod 11 of Group 7 Dropped.Caused by Control Rod Drive Mechanism Stator Failure.Stator Replaced (← links)
- 05000313/LER-1982-018-03, /03L-0:on 820716,ten Improperly Sealed Penetrations Through Fire Barriers Discovered.Caused by Personnel Failure to Recognize Sealing Requirements During Installation.Penetrations Properly Sealed (← links)
- 05000313/LER-1991-003, :on 910421,actuation of Emergency Feedwater Sys During Plant Heatup Occurred Due to Low Once Through Steam Generator Level Resulting from Inadequate Feedwater Flow. Caused by Degraded Auxiliary Feedwater (← links)
- 05000313/LER-1982-016-03, /03L-0:on 820714,during Monthly Surveillance Testing,Control Rod Drive B Breaker Failed to Trip Immediately Upon Receipt of Trip Signal.Cause Undetermined Since Breaker Performed Properly During 10 Subsequent Tests (← links)
- 05000313/LER-1993-007, :on 931122,discovered Radwaste Area Effluent Flowpath Not Continuously Monitored During Release Due to Separated Sample Line Connection Resulting from Inadequate Procedural Guidance.Procedures Revised (← links)
- 05000313/LER-1993-005, On 931014,discovered RBS That Resulted from Inadequate Design Review Creating Potential for Degraded Low & High Pressure Injections & Reactor Building Flows. Caused by Inadequate Review (← links)
- 05000313/LER-1982-015-03, /03L-0:on 820713,diesel Generator 1 Fuel Oil Transfer Pump Overfilled Day Tank,Fuel Oil Trouble Alarm Tripped & Diesel Generator Room Filled W/Smoke.Caused by Malfunction of High Level Limit Switch LSH-5205 (← links)
- 05000313/LER-1982-014-03, /03L-0:on 820706,vent Line Separated from Casing of Borated Water Recirculation Pump P-66 for Spent Fuel Cooling Sys.Caused by Fatigue Crack in Threads Due to Pump Vibration.Cracked Vent Pipe Replaced (← links)
- 05000313/LER-1990-011-02, :on 900930,unexpected Actuation of Control Room Emergency Ventilation Sys Occurred.Caused by Chlorine Monitor Tripped (← links)
- 05000313/LER-1982-013-03, /03L-0:on 820628,vent Pipe for Casing of Spent Fuel Cooling Pump P40A Found Leaking.Caused by Fatigue Cracking Due to Normal Pump Vibration.Vent Pipe Replaced. Vibration Study Will Be Performed (← links)
- 05000313/LER-1993-005-02, :on 931014,breaches in Reactor Bldg Sump Integrity Which Resulted from Inadequate Design Change Review,Created Potential for Degraded Low & High Pressure Re Injection & Reactor Bldg Spray Sys Flows Following LOCA (← links)
- 05000313/LER-1993-006-01, :on 931014,discovered Testing of Charcoal Used in Ventilation/Filtration Sys Not Performed Per Tss.Caused by Inadequate Process for Control of Charcoal.Sys Will Be Restored to Single Batch Configuration (← links)
- 05000313/LER-1990-008, :on 900809,determined That Control Room Wall Not Seismically Qualified.Caused by Engineering Error in Accepting Deficient Installation During Const of Wall.Review of All Masonary Walls in Progress (← links)
- 05000313/LER-1993-003-02, :on 930930,evaluation Indicated B Decay I Injection Pump Incapable of Performing Recirculation Mode Function Following Loca.Caused by Inadequate Procedural Guidance.Procedures Reviewed (← links)
- 05000313/LER-1993-004-02, :on 931004,red Train Volt Engineered Safeguards Bus & Volt Load Ctr Unintentionally de-energized.Caused by Procedural Deficiency.Procedure Revised (← links)
- 05000313/LER-1990-007-02, :on 900731,discovered That Svc Water Supply Line Not Seismically Qualified Due to Excessive Loading by Lead Shielding.Caused by Inadequate Procedural Guidance.Lead Shielding Removed & Svc Water Inspected (← links)
- 05000313/LER-1990-006, :on 900720,discovered motor-operated Valves & Actuators Located Below Current Accident Flood Elevation W/O Being Qualified for Submergence.Caused by Personnel Error. Change Initiated to Replace Components (← links)
- 05000313/LER-1990-005, :on 900703,possible Failure of Containment Isolation Valve Associated W/Letdown Sys Discovered.Caused by Inadequate Electrical Separation Between Safety & nonsafety-related Components.Mod Installed (← links)
- 05000313/LER-1990-012-02, :on 900929,defects in ASME III Class 1 Stainless Steel Pipe Discovered During Prefabrication Welding (← links)
- 05000313/LER-1982-012-03, /03L-0:on 820525,steam Generator a Tube Leak Determined from Indications on Condenser Offgas & N-16 Monitors.Leakage Undetectable Using Normal Leak Rate Calculations.Caused by Intergranular Cracking (← links)
- 05000313/LER-1982-011-03, /03L-0:on 820514,discovered That on 820502 Reactor Heated Above 280 F W/O Proving Emergency Feedwater Sys Operable Through Successful Completion of Required Automatic Actuation Surveillance Tests (← links)
- 05000313/LER-1982-010-03, /03L-0:on 820511,while at 45% Full Power,Standby Hydrogen Purge Sys Failed Monthly Surveillance Test,Failing to Meet Tech Spec Requirements.Caused by Filter Saturated W/Water.Filter Replaced (← links)
- 05000313/LER-1982-009-01, /01T-0:on 820401,nondestructive Exam of HPI Nozzles Indicated Defects Associated W/A,B & D Nozzles.Task Force of B&W Owners Group Set Up to Determine Cause & Propose long-term Corrective Actions (← links)
- 05000313/LER-1982-007-03, /03L-0:on 820324,surveillance Revealed That Anticipatory Reactor Trip Main Feedwater Pump & Turbine Tripped Bypass Setpoints Exceeded Tech Spec Limits.Caused by Inadequate Review & Implementation Procedures (← links)
- 05000313/LER-1982-007, Forwards LER 82-007/03L-0 (← links)
- 05000313/LER-1982-006-03, /03L-0:on 820316,while at 83% Power,Control Room Emergency Air Conditioning Sys Fan VSF-9,indicated Low Air Flow.Caused by Accumulation of Dust.Diameter of Suction Restriction Increased (← links)
- 05000313/LER-1982-006, Forwards LER 82-006/03L-0 (← links)
- 05000313/LER-1982-005, Forwards Corrected LER 82-005/03L-0 (← links)
- 05000313/LER-1990-003-01, :on 900423,discovered That Incorrect Monitoring Instrumentation for Radiological Effluent Ventilation Sys Utilized to Comply W/Tech Specs.Caused by Mgt Oversight.Logs Process Monitors Will Not Be Used (← links)
- 05000313/LER-1982-004-03, /03L-0:on 820125,RCS Makeup Water Backflowed Into Deionized Water Header,Allowing Contaminated Water to Enter Noncontaminated Sys.Caused by Failure of Check Valve CS-34 & Tripping of Condensate Transfer Pump P-9A (← links)
- 05000313/LER-1982-004, Forwards LER 82-004/03L-0 (← links)
- 05000313/LER-1982-003-03, /03L-0:on 820128,while Performing Preventive Maint,Oil Changed in Primary Makeup Pump P-36A Which Was Selected to Engineered Safeguards Mode While Makeup Pump P-36C Was Out of Svc.Caused by Inadequate Communications (← links)
- 05000313/LER-1982-003, Forwards LER 82-003/03L-0 (← links)
- 05000313/LER-1982-002-03, /03L-0:on 820114,RCS Letdown Isolation Valve CV-1221 Failed to Close Properly During Quarterly Surveillance Test.Caused by Torquing Out of Valve Operator Apparently Due to Low Torque Switch Setting (← links)
- 05000313/LER-1982-002, Forwards LER 82-002/03L-0 (← links)
- 05000313/LER-1982-001-03, /03L-0:on 820112,RCS Leak Rate Calculation Indicated Leak Rate of 1.433 Gpm from Flange for Vent Line for Reactor Coolant Pump P32C Seal Cavity Pressure Sensing Line.Caused by Loose Flange Bolts (← links)
- 05000313/LER-1982-001, Forwards LER 82-001/03L-0 (← links)
- 05000313/LER-1981-014, Revised LER 81-014/01T-1:on 811119,diesel Generator 1 Lockout Relay Tripped Rendering Generator Inoperable.Caused by Alarm Flag Dropping on Generator Relay 187-DG1 C Phase High Speed Differential Relay (← links)
- 05000313/LER-1981-014-01, /01T-0:on 811119,diesel Generator 1 Lockout Relay Tripped.Caused by Alarm Flag Dropped on Sensitive C Phase High Speed Differential Relay.Caution Cards Attached to Control Cubicle Doors & Differential Current Relay Disabled (← links)
- 05000313/LER-1981-001-01, /01T-0:on 810117,during Reactor Bldg Cooler Svc Water Lines Engineering Analysis,Discovered Previous Analyses Considering Cooling Unit Piping Nozzles as Rigid Anchors.Nozzle Loads Imposed by Vendor Overlooked (← links)
- 05000313/LER-1981-001, Forwards LER 81-001/01T-0 (← links)
- 05000313/LER-1993-002, :on 930309,during Transfer of Power Sources from offsite-supplied Startup Transformer to Unit Auxiliary Transformer,Circuit Breaker Did Not Close.Caused by Procedural Deficiency.Breaker racked-out (← links)
- 05000313/LER-1993-001-01, :on 930305,experienced Reactor Trip Initiated by ARTS as Result of Main Turbine Trip.Caused by Occurrence of Two Grounds on 125 Vdc Bus D-1.Wiring Application at Main Circuits Will Be Evaluated for Damage (← links)
- 05000313/LER-1989-007, :on 890318,determined That Postulated Break in HPI Line Upstream of Hpi/Rcs Cold Leg Connection & Downstream of First Rcs/Hpi Boundary Check Valve Could Constitute Loca.Caused by Inadequate Design (← links)
- 05000313/LER-1990-002-01, :on 900228,determined That Manual Isolation Valves Installed in HPI Pumps Casing Drain Lines Not Designed for Max HPI Sys Operating Pressure.Caused by Inadequate Design Assumptions & Drawing Info (← links)
- 05000313/LER-1981-013-03, /03L-0:on 810826,leak Discovered in Weld of Drain Line of a Decay Heat Pump Discharge Piping.Cause Believed to Be Vibration Fatigue.Cracked Weld & Associated Drain Line Cut Out,Repiped & Welded Back Into Place.Hanger Added (← links)
- 05000313/LER-1981-013, Forwards LER 81-013/03L-0 (← links)
- 05000313/LER-1981-012-03, /03L-0:on 810821,when Emergency Diesel Generator (EDG) Was Given Autostart Signal Following Turbine Trip,Edg Came to Speed But Failed to Tie In.Overcrank Annunciator Alarmed.Caused by Defective Speed Sensing Relay (← links)
- 05000313/LER-1981-012, Forwards LER 81-012/03L-0 (← links)
- 05000313/LER-1981-011-03, /03L-0:on 810810,during Stroke Test,Recirculation Valve of Makeup Pump & Redundant Valve Failed to Show Full Closed Indication.Caused by Valve Torque Settings Too Low to Move Valves Under Sys Pressure.Settings Increased (← links)
- 05000313/LER-1981-011, Forwards LER 81-011/03L-0 (← links)
- 05000313/LER-1983-001-03, /03L-0:on 830110,pressurizer Code Relief Valve Setpoint Averaged Above Tech Spec Limit During Setpoint Testing.Cause Unknown.Spring Compression Adjusted on Test Stand.Valve Retested & Acceptable Results Obtained (← links)
- 05000313/LER-1983-001, Forwards LER 83-001/03L-0 (← links)
- 05000313/LER-1982-030, Updated LER 82-030/01T-1:on 821214,while Performing B once- Through Steam Generator Tubing Surveillance During Refueling Outage,Eddy Current Testing Revealed 5 Tubes W/Greater than or Equal to 40% through-wall Indications.Cause (← links)
- 05000313/LER-1982-031, Forwards LER 82-031/01T-0 (← links)
- 05000313/LER-1982-032-01, /01T-0:on 821229,B&W Eddy Current Testing Personnel Found 25 Tubes in Once Through Steam Generator a W/Greater than or Equal to 40% through-wall Indications. Addl Info Will Be Provided in Followup Rept (← links)
- 05000313/LER-1982-023-03, /03L-0:on 820806,containment Isolation Valves for Instrument Air Sys Opened During Cooldown to Supply Air for Work on Control Rod Drive Mechanism Stator.Caused by Personnel Error.Valves Closed & Locked (← links)
- 05000313/LER-1982-023, Forwards LER 82-023/03L-0 (← links)
- 05000313/LER-1982-022-03, /03L-0:on 820807,during Cooldown W/Rcs Temp at 307 F,Control Rod Drive Dc Breaker Did Not Trip as Required. Caused by Undervoltage Trip Device Out of Adjustment. Proper Adjustments Made & Breaker Tested Satisfactorily (← links)
- 05000313/LER-1982-022, Forwards LER 82-022/03L-0 (← links)
- 05000313/LER-1991-003-02, :on 910421,actuation of EFW Sys During Plant Heatup Occurred Due to Low Once Through Steam Generator Level.Caused by Leaking Feedwater Recirculation Valve.Plant Startup Procedure OP 1102.02 Will Be Revised (← links)
- 05000313/LER-1991-002-03, :on 910410,inadvertent Actuations of Combined Control Emergency Ventilation Sys Occurred.Caused by Transient Noise Spike.Mod Will Be Completed by 910531 to Install Time Delay in Actuation Circuitry (← links)
- 05000313/LER-1983-017-03, /03L-0:on 830707,once-through Steam Generator Exhibited Small Primary to Secondary Leak.During Cooldown, Leak Rate Increased to 0.2 Gpm.Caused by Intergranular Stress Corrosion Cracking on Single Tube 77-18 (← links)
- 05000313/LER-1983-016-03, /03L-0:on 830710,pressurizer Cooldown Rate Exceeded Tech Spec Limit.Caused by Personnel Error & Procedural Inadequacies.Dhr Operations Procedure Revised to Add Caution Statements Re Cooldown (← links)
- 05000313/LER-1982-028, Forwards LER 82-028/03L-0 (← links)
- 05000313/LER-1989-049, :on 891220,discovered That Okonite T-95 Tape Not Used to Tape Internal Motor Lead Connections for Main Feedwater Containment Isolation Valves.Caused by Personnel Error.Valves Taped According to Design Drawing (← links)
- 05000313/LER-1989-039, :on 891116,discovered That Door for Upper North Electrical Penetration Room Open & Latch Mechanism Missing. Caused by Abnormally High Differential Pressure Across Door. Ventilation Sys Flow Balance Performed (← links)
- 05000313/LER-1981-010-03, /03L-0:on 810804,during Calibr,Reactor Protective System Channel B Scaled Difference in Amplifier Gain Setting Differed from Value in Power Escalation Test.Caused by Incorrect Pentiometer Adjustment.Procedure Revised (← links)
- 05000313/LER-1981-010, Forwards LER 81-010/03L-0 (← links)
- 05000313/LER-1981-009-03, /03L-0:on 810727,during Start Test of Steam Driven Emergency Feedwater Pump P7A,steam Generator B Valve CV-2617 Did Not Open on Demand.Caused by Excessive Play Due to Wear.Switch Replaced (← links)
- 05000313/LER-1981-009, Forwards LER 81-009/03L-0 (← links)
- 05000313/LER-1981-008-03, /03L-0:on 810602,sodium Hydroxide Tank Level Fell Below Tech Spec Requirements.Caused by Test Procedure Assuming Familiarity W/Sys Layout & Idiosyncrasies.Tank Refilled (← links)
- 05000313/LER-1981-008, Forwards LER 81-008/03L-0 (← links)
- 05000313/LER-1981-005-03, /03L-0:on 810408,steam Driver Emergency Feedwater pump,P7A,was Started & Then Tripped by Turbine Overspeed Mechanism.Caused by Worn Edges on Trip Mechanism.Mechanism Adjusted to Latch Firmly.Preventive Maint Program Revised (← links)
- 05000313/LER-1981-005, Forwards LER 81-005/03L-0 (← links)
- 05000313/LER-1989-048, :on 891228,automatic Reactor Trip & ESF Actuation Occurred as Result of Loss of All Main Feedwater Flow Due to Inadvertent Tripping of Main Feedwater Pump. Caused by Personnel error.O-rings Replaced (← links)
- 05000313/LER-1989-047, :on 891219,RCS Temp Increased Above 250 F W/ Oxygen Concentration Greater than Tech Specs Limit.Caused by Inadequate Procedural Guidance.Plant Startup Procedure Revised to Require Chemistry Dept Signoff (← links)
- 05000313/LER-1989-042, :on 891209,inadvertent Actuation of Control Room Emergency Ventilation Sys Occurred.Caused by Keying of Hand Held Radio in Vicinity of Chlorine Monitors by Technician.Technician Counseled (← links)
- 05000313/LER-1989-045, :on 891210,discovered That U-bolt Supports on Two Containment Isolation Valves in Containment Bldg Not Installed & Pressurizer Sample Lines & Valves Considered Inoperable.Missing U-bolts Installed (← links)
- 05000313/LER-1989-040, :on 891205 & 06,automatic Actuations of Emergency Diesel Generator Occurred as Result of Loss of Power to 480-volt ESF Bus.Caused by Personnel Error During Bus Transfer.Mgt Briefings Conducted (← links)
- 05000313/LER-1989-043, :on 891208,discovered That Approx 50% of One Nut Ring Half Beneath Reactor Vessel Nozzle Flange Corroded Away.Caused by Gradual Deterioration of Gasket Matl.Design Change Implemented (← links)
- 05000313/LER-1989-046, :on 891204,reactor Bldg Isolation Valves Rendered Inoperable Due to Deficient Welds on Piping Supports Which Were Installed During Initial Plant Const. Deficient Supports Repaired Prior to Restart (← links)
- 05000313/LER-1981-007-03, /03L-0:on 810427,emergency Diesel Generator K4B Failed to Start,Tripping Lockout Relay & Loss of Excitation Relay.Caused by Blocking Device in Auxiliary Contacts of Loss of Excitation Relay.Device Removed.Procedure Revised (← links)
- 05000313/LER-1981-007, Forwards LER 81-007/03L-0 (← links)
- 05000313/LER-1980-007-99, Vendor Notified of Discrepancy Between Decay Heat Pump Specs & Parts Supplied. Potential Failure Feared.Tests & Performance History Indicate No Reliability Problems (← links)
- 05000313/LER-1979-010, Forwards Updated LER 79-010/01X-1 (← links)
- 05000313/LER-1989-044, :on 891214,incorrect Assumptions & Calculational Errors Identified for Low Pressure Injection & Reactor Bldg Spray Pumps When Aligned to Take Suction from Reactor Bldg Sump (← links)
- 05000313/LER-1989-038, :on 891114,reactor Trip Occurred as Result of Inadvertent Closure of Main Feedwater Isolation Valve.Caused by Personnel Error.Disciplinary Action Taken Against Individual & Senior Mgt Personnel Put on Shift (← links)
- 05000313/LER-1980-030-99, Three Lower Manway Studs on Once Thru Steam Generator E24A Were Found W/Indications of Cracking.Caused by Stress Corrosion Mechanism.Studs Replaced (← links)
- 05000313/LER-1980-030, Forwards Updated LER 80-030/99X-1 (← links)
- 05000313/LER-1980-028-01, Intake Structure Concrete Access Plugs Removed.Later Review Identified Access Barriers to Be Missile Shields & No Protection Provided at Personnel Access Doors.Plugs Replaced (← links)
- 05000313/LER-1980-028, Forwards Revised LER 80-028/01X-1 (← links)
- 05000313/LER-1981-004-03, /03L-0:on 810227,diesel Fire Pump Battery Bank Surveillance Test Found Not Completed within Grace Period. Caused by Failure to Notify Supervisor That Procedure Could Not Be Completed During Shift (← links)
- 05000313/LER-1981-004, Forwards LER 81-004/03L-0 (← links)
- 05000313/LER-1981-006-03, /03L-0:on 810408,emergency Feedwater Feed Valve CV-2670 to Steam Generator a Control Power Fuse Blew on Valve Actuator.Caused by Fuse Opening on Transient Current. Fuse Replaced W/Slower Acting Fuse (← links)
- 05000313/LER-1981-006, Forwards LER 81-006/03L-0 (← links)
- 05000313/LER-1981-003-03, /03L-0:on 810113,penetration Fire Barrier Between North Wall & Compressor C2B Removed W/O Establishing Fire Watch Per Tech Specs.Caused by Inadequate Instructions to Contractor Personnel.Contractor Procedures Modified (← links)
- 05000313/LER-1981-003, Forwards LER 81-003/03L-0 (← links)
- 05000313/LER-1980-040, Forwards LER 80-040/99X-0 (← links)
- 05000313/LER-1980-027-04, /04L-0:on 800725,average Gas Release Rate for Third Quarter 1980 Is 4.47% of Release Rate Per Tech Specs. Caused by Reactor Bldg Purge Following Shutdown to Correct Steam Generator Tube Leak.Failed Fuel Will Be Rotated (← links)
- 05000313/LER-1980-029-03, /03L-0:on 800723,penetration C2 Barrel Test Was Found to Have Exceeded 6-month Testing Frequency by 23 Days. Caused by Test Not Being Scheduled Due to Changes in Personnel & Responsiblities.Test Has Been Reidentified (← links)
- 05000313/LER-1980-029, Forwards LER 80-029/03L-0 (← links)
- 05000313/LER-1980-026, Forwards LER 80-026/03L-0 (← links)
- 05000313/LER-1981-002-99, /99X-0:on 810303,during Steam Generator Tubing Surveillance Insp,First Sample Results on E24A Found Three Tubes Exceeded Plugging Limit.Cause Not Stated (← links)
- 05000313/LER-1981-002, Forwards LER 81-002/99X-0 (← links)
- 05000313/LER-1980-041-03, /03L-0:on 801128,lead Dihydrogen Purge Supply Fan, VSF-30A,tripped.Caused by Blown Control Fuse Due to Overcurrent.Control Power Fuse & Control Transformer Increased to Accommodate Increased Load (← links)
- 05000313/LER-1980-041, Forwards LER 80-041/03L-0 (← links)
- 05000313/LER-1980-038-03, /03L-0:on 801013,during Monthly Surveillance Testing of Number One Diesel Generator,Voltage Regulator Failed to Respond to Higher or Lower Signal.Caused by Internal Mechanical Wear.Regulator Replaced (← links)
- 05000313/LER-1980-038, Forwards LER 80-038/03L-0 (← links)
- 05000313/LER-1980-036-03, /03L-0:on 800929,nuclear Instrumentation Calibr Was Not Performed within 24-h of 10% Power Change.Caused by Personnel Error.Personnel Reacquainted W/Proper Procedure (← links)
- 05000313/LER-1980-036, Forwards LER 80-036/03L-0 (← links)
- 05000313/LER-1980-037-03, /03L-0:on 800929,during Monthly Surveillance of Lead Hydrogen Purge Sys,Supply Fan VSF-30A Flow Slowly Degraded & Exhaust Fan VEF-37A Tripped.Caused by Sticking Check Valves & Restricted Filters.Valves Cleaned (← links)
- 05000313/LER-1980-027-03, Average Gross Gas Release Rate for 3rd Quarter Was Exceeded.Caused by Presence of 0.19% Failed Fuel & Two Shutdowns.Attempts Will Be Made to Repair or Replace Failed Fuel (← links)
- 05000313/LER-1980-027, Forwards Updated LER 80-027/03X-1 (← links)
- 05000313/LER-1980-035-99, /99X-0:on 800916,during Investigation of Svc Water Condition,Flow Check & Cooling Coil Indicated Southwest Side of Coolers VCC2C & D Were Partially Restricted.Caused by Buildup of Asian Clams.Engineering Evaluation Is Contin (← links)
- 05000313/LER-1980-037, Forwards LER 80-037/03L-0 (← links)
- 05000313/LER-1980-035, Forwards LER 80-035/99X-0 (← links)
- 05000313/LER-1980-031-03, /03L-0:on 800827,during Monthly Surveillance Test, Excessive Smoke Observed in Emergency Diesel Generator Turbo Charger Exhaust Flange.Caused by Exhaust Gas Contact W/ Insulation,Due to Loose Bolts & Gasket (← links)
- 05000313/LER-1980-031, Forwards LER 80-031/03L-0 (← links)
- 05000313/LER-1980-034-03, /03L-0:on 800905,during Normal Operation,Small Primary to Secondary Leak Developed from Steam Generator E24A.Caused by Flow Induced Vibration Crack in Tube 74-2. Tube Was Plugged & Unit Returned to Svc (← links)
- 05000313/LER-1980-034, Forwards LER 80-034/03L-0 (← links)
- 05000313/LER-1980-033-03, /03L-0:on 800906,during Normal Cooldown Operations,Rcs Makeup Block Valve Failed to Close Fully on Command.Caused by High Differential Across Valve,Resulting in Operation of Close Torque Limit Switch (← links)
- 05000313/LER-1980-033, Forwards LER 80-033/03L-0 (← links)
- 05000313/LER-1980-032-04, /04L-0:on 800905,during Cooldown Following Steam Generator Tube Leak,Excessive Release of Radioactive Matls in Gaseous Wastes Occurred.Caused by Premature Lifting of Letdown Relief Valve PSV-1236.Valve Was Readjusted (← links)
- 05000313/LER-1980-032, Forwards LER 80-032/04L-0 (← links)
- 05000313/LER-1989-037, :on 891110,reactor Trip Occurred as Result of Inadvertent Grounding of Reactor Protection Sys Power Supply During Surveillance Testing.Caused by Inadequate Procedure. Procedures Revised (← links)
- 05000313/LER-1989-034, :on 891031,control Room Emergency Air Conditioning Sys Rendered Inoperable Due to Removing Independent Circuits from Svc.Caused by Inadequate Guidance.Procedures Revised & Circuits Flagged (← links)
- 05000313/LER-1989-035, :on 891028,inadvertent Actuations of Control Room Emergency Ventilation Sys Occurred.Caused by Spurious Trips of Chlorine Monitor.Trip Reset & Sys Returned to Normal.Engineering Evaluation Initiated (← links)
- 05000313/LER-1989-036, :on 891017,breaker in 120-volt Ac Vital Electrical Distribution Panel Closed & Control Room Emergency Ventilation Sys Actuated.Caused by Electrical Short in Power Supply.Circuit Repaired (← links)
- 05000313/LER-1980-025-03, /03L-0:on 800711,during Surveillance Test on Standby Exhaust Fan,Fan Failed to Maintain Required Flow Per Time Length.Caused by Internal Fouling of Sys Piping & Valves.Sys Cleaned,Retested & Proven Operable (← links)
- 05000313/LER-1980-025, Forwards LER 80-025/03L-0 (← links)
- 05000313/LER-1980-024-03, /03L-0:on 800706,during Start of Emergency Feedwater Pump Turbine Drive Surveillance,Pump Tripped on Overspeed.Caused by Five of Eight Studs Holding Governor Steam Valve to Turbine Being Broken.All Bolts Replaced (← links)
- 05000313/LER-1980-024, Forwards LER 80-024/03L-0 (← links)
- 05000313/LER-1980-023-03, /03L-0:on 800709,during Test of Steam Driven Emergency Feed Pump P-7A,main Steam Supply Valve CV-2667 to P-7A Did Not Fully Open on Demand.Caused by Valve Operator Torquing Out Early.Torque Switch Given Small Adjustment (← links)
- 05000313/LER-1980-023, Forwards LER 80-023/03L-0 (← links)
- 05000313/LER-1980-019-03, /03L-0:on 800619,during Fire Sys Test,Fire Pump P6A Could Not Be Stopped from Control Room.Caused by Low Fire Sys Pressure Resulting from Leaking Fire Sys Relief Valve.Valve Adjusted (← links)
- 05000313/LER-1980-019, Forwards LER 80-019/03L-0 (← links)
- 05000313/LER-1977-020-03, /03L: on 771023,diesel Generator 1 Failed to Start During Monthly Test.Caused by Starter Failure Time Delay Relay Setpoint Drift & Shorted Diode.Setpoint Adjusted & Diode Replaced (← links)
- 05000313/LER-1977-020, Forwards LER 77-020/03L-0 (← links)
- 05000313/LER-1978-008-03, /03L-0:on 780320,turbocharger for Diesel Generator 2 Caught Fire.Caused by Bearing Failure Between Air Inlet & Exhaust Turbine Bladings.Turbocharger Replaced (← links)
- 05000313/LER-1978-008, Forwards LER 78-008/03L-0 (← links)
- 05000313/LER-1978-007-03, /03L-0:on 780308,ventilation Dampers Failed to Seal Properly After Actuation.Caused by Sticky Air Supply Sys.Bladder Pressure Gauges Replaced & Air Supply re-adjusted (← links)
- 05000313/LER-1978-006-03, /03L-0:on 780305,studs on Lower Steam Generator Primary Manway Cover Sheared Off.Caused by Crack of 90% of Stud Diameter.Studs Ultrasonically Checked for Cracks & One Removed (← links)
- 05000313/LER-1978-005-03, /03L-0:on 780302,steam Generator Tube Indications Exceeded Plugging Limit on 40% of Nominal Wall Thickness. Caused by Defect Near Upper Tube Sheet.Tubes Plugged (← links)
- 05000313/LER-1978-004-03, /03L-1:on 780211,four Hydraulic Shock Suppressors Found Inoperable.Caused by Maladjustment,Corrosion & Metal Shavings in Valves.All 69 Suppressors Tested;One Had No Deficiency.Deficient Suppressors Repaired or Replaced (← links)
- 05000313/LER-1978-004, Forwards LER 78-004/03L-1 (← links)
- 05000313/LER-1978-001-04, /04L-0:during Fourth Quarter 1977,average Noble Gas Release Rate Exceeded Max Allowable Rate During Outage. Results Possibly False Due to Airborne Radioactivity in Counting Lab.Monitoring Sys Design Being Reviewed (← links)
- 05000313/LER-1978-001, Forwards LER 78-001/04L-0 (← links)
- 05000313/LER-1977-022-01, /01T:on 771123,loss of Required Overlap Between Operating Control Rod Groups Occurred.Caused by Group 7 Not Reaching in-limit When Motion Was Stopped.Operator Adjusted Group 5 Manually (← links)
- 05000313/LER-1978-001-01, /01T-0:on 780105,during Soluble Boron Shutdown Analysis for Another B&W Facility,Boric Acid Vol Deficiency Found.Caused by Change to Tech Specs W/O Changing Calculated Vol Requirement.Cycle 3 Tech Specs to Be Changed Soon (← links)
- 05000313/LER-1977-022, Forwards LER 77-022/01T-0 (← links)
- 05000313/LER-1977-021-03, /03L-0:on 771122,reactor Bldg Cooling Fan VSF-1B Tripped.Caused by Unlubricated Bearings.Fans Placed on Lubrication Schedules & VSF-1C Bearings Replaced (← links)
- 05000313/LER-1978-003-03, /03L-0:on 780203,mist Spray from Reactor Coolant Pump Seal Leak Contaminated Reactor Bldg Areas.Cause Unknown.Leak Isolated & Bldg Areas Decontaminated (← links)
- 05000313/LER-1977-023-03, /03L-0:on 771125,leak Found in B Header Spray Piping at 390 Ft.Cause unknown.10 Ft of Piping Replaced (← links)
- 05000313/LER-1978-002-03, /03L-0:on 780113,steam Supply Valve CV-2667 from Generator to Turbine Driver Failed to Open Remotely.Caused by Defective Valve Operator Torque Switch.Switch Replaced (← links)
- 05000313/LER-1977-024-03, /03L-0:on 771125,pinhole Leaks Found in Spent Fuel Cooling Sys.Cause Unknown.Leaks Will Be Monitored & Repaired Prior to Second Refueling Outage (← links)
- 05000313/LER-1977-027-03, /03L-0:on 771203,weld in Vent Line to Valve DH-1010 Leaked.Caused by vibration.Three-quarter Inch Half Coupling & Vent Valve Replaced w/2 by 3 Inch Sockolet & Plug,Eliminating Valve DH-1010 (← links)
- 05000313/LER-1977-025-03, /03L-0:on 771129,during Insp,Snubber Fluid Reservoir for PSV-1000 Found Empty W/Cracked Wiper Ring. Caused by Ring Matl.New Ring & Gaskets Made of Ethylene Propylene Installed (← links)
- 05000313/LER-1977-026-03, /03L-0:on 771203,reactor Coolant Pump Seal Pressure Dropped & Leakage Occurred.Caused by Wear Due to Startups & Shutdowns.All Pump Seals Replaced (← links)
- 05000313/LER-1978-022-03, /03L-0:on 780820,fluid in Hydraulic Shock Suppressor Did Not Cover Supply Line to Valve Body.Caused by Incorrect Suppressor Installation.Suppressor re-oriented (← links)
- 05000313/LER-1978-021-03, /03L-0:on 780818,leak Found in B Reactor Coolant Pump Area.Caused by High Pressure Seal Cavity Pressure Sensing Line Leak.Leak to Be Repaired in Next Shutdown (← links)
- 05000313/LER-1978-020-03, /03L-0:on 780817,solenoid Valve SV 7807,supplying Control Air to VSF-9 Discharge Damper,Failed.Caused by Valve Defect.Valve Replaced (← links)
- 05000313/LER-1978-009-01, /01T-0:on 780413,B&W Advised Util That Results of 0.04 Ft Squared RCS Pump Discharge Break Analysis Unacceptable.Caused by ECCS Analysis re-evaluation Performed for Newer B&W Plants (← links)
- 05000313/LER-1978-009, Forwards LER 78-009/01T-0 (← links)
- 05000313/LER-1978-011-03, /03L-0:on 780420,exhaust Fan VEF-37B Supply Breaker Tripped.Cause Unknown.Circuit Breaker & Overload Heater Replaced (← links)
- 05000313/LER-1978-010-03, /03L-0:on 780419,motor Operator of Standby Hydrogen Purge Isolation Valve CV-7449 Failed to Torque Out. Caused by Torque Switch Failure.Switch Replaced (← links)
- 05000313/LER-1978-013-03, /03L-0:on 780426,emergency Supply Fan VSF9 Failed to Start Automatically During Radiation Monitor RE-8001 Testing.Caused by Defective Actuating Solenoid.Solenoid Repaired (← links)
- 05000313/LER-1978-013, Forwards LER 78-013/03L-0 (← links)
- 05000313/LER-1978-015-03, /03L-0:on 780505,electric Driven Fire Pump Capacity Found Inadequate During Fire Water Sys Testing. Caused by Crack in Suction Bowl.Fire Pump Repaired (← links)
- 05000313/LER-1978-014-03, /03L-0:on 780504,radiation Monitoring Sys Was Not Surveillance Tested on Schedule.Caused by Personnel Responsility Change.Quarterly Surveillance Rescheduled to Meet Frequency Requirement (← links)
- 05000313/LER-1978-016-03, /03L-0:on 780519,hydrogen Purge Lead Sys Supply Fan VSF-30A Tripped.Cause Unknown.Overload Relay Reset & Current Checked (← links)
- 05000313/LER-1978-016, Forwards LER 78-016/03L-0 (← links)
- 05000313/LER-1989-028, :on 890912,extra Contact Found in Control Circuits for Svc Water Pumps P4A & P4C Which Was Not on Schematics.Caused by Inadequate Configuration Control During Design Phases.Wiring Insps Program Initiated (← links)
- 05000313/LER-1989-032, :on 890906,discovered That Monthly Functional Test for Reactor Bldg Area Radiation Monitors Not Performed as Required by Tech Spec.Caused by Inadequate Procedural Guidance.Procedure Rev Request Form Revised (← links)
- 05000313/LER-1989-033, :on 891009,power-range Nuclear Instrumentation Not Calibr in Accordance W/Frequency Established by Tech Specs.Caused by Inadequate Procedural Guidance.Memo Issued Re Proper Scheduling of Surveillance Tests (← links)
- 05000313/LER-1980-018-01, /01T-0:on 800524,during Investigation Per IE Bulletin 80-08,discrepancy in Records of Weld Insps Found. Caused by Failure to Properly Review Weld Record Documentation for Particular Weld During Const (← links)
- 05000313/LER-1980-018, Forwards LER 80-018/01T-0 (← links)
- 05000313/LER-1979-016, Forwards Updated LER 79-016/03X-1 (← links)
- 05000313/LER-1980-015-01, /01T-0:on 800510,changes in Seal Pressure & Makeup Tank Level Occurred During Steady State Power Operation. Caused by Rx Coolant Pump Seal C.Seal Cartridge Rebuilt & Seal Failure Being Investigated (← links)
- 05000313/LER-1980-015, Forwards LER 80-015/01T-0 (← links)
- 05000313/LER-1978-019-01, B&W Discovered That Weld Filler Wire Atypical of Submerged Arc Weld Filler Wires Specified,Was Unknowingly Mixed by Supplier.Pressure/Temp Curves Revised Then Later Reverted to Original Curves (← links)
- 05000313/LER-1978-019, Forwards Updated LER 78-019/01X-1 (← links)
- 05000313/LER-1980-013-03, /03L-0:on 800407,during Reactor Trip of Offsite Power,High Pressure Injection Was Manually Initiated & CV-1227 High Pressure Injection Valve,Loop B Failed to Open on Demand.Caused by Stuck Engaging Lever (← links)
- 05000313/LER-1980-013, Forwards LER 80-013/03L-0 (← links)
- 05000313/LER-1980-007-01, /01T-0:on 800314,B&W Advised That Mating Wear Rings on Double Suction Pump Could Cause Pump Failure During Accident Conditions.Caused by Failure to Document Design Revision on Pump Design Drawings (← links)
- 05000313/LER-1980-007, Forwards LER 80-007/01T-0 (← links)
- 05000313/LER-1980-020-03, /03L-0:on 800621,during Makeup Pump Test,Rod Index Limits Exceeded.Caused by Operator Inadvertently Opening Inlet to Standby Demineralizer.All Operators Reviewed Occurrence (← links)
- 05000313/LER-1980-020, Forwards LER 80-020/03L-0 (← links)
- 05000313/LER-1980-021-03, /03L-0:on 800624,during Reactor Trip,Steam Driven Emergency Feedwater Pump Automatically Started Per Design But Tripped on Overspeed.Cause Undetermined.Pump Proved Operable Before Returning to Power (← links)
- 05000313/LER-1980-021, Forwards LER 80-021/03L-0 (← links)
- 05000313/LER-1980-022-01, /01T-0:on 800624,w/Mayflower 500 Kv Transmission Line Out of Svc & Unit Operating at Full power,500 Kv Mabelvale Line Tripped.Caused by Ground Fault & Overload. Lock-out Relays Were Reset & 500 Kv Bus re-energized (← links)
- 05000313/LER-1980-022, Forwards LER 80-022/01T-0 (← links)
- 05000313/LER-1980-016-03, /03L-0:on 800611,during Hydrogen Purge Sys Surveillance Testing,Proper Sys Flow Could Not Be Obtained. Caused by Rust Scale Lodged in Check Valves.Check Valves Cleaned & Reassembled (← links)
- 05000313/LER-1980-016, Forwards LER 80-016/03L-0 (← links)
- 05000313/LER-1980-017-03, /03L-0:on 800519,while Opening Reactor Bldg Bypass Dampers,Damper 7410 Would Not Operate.Caused by Hoist Still Being Connected to Damper.Damper Reset & Hoist Removed (← links)
- 05000313/LER-1980-017, Forwards LER 80-017/03L-0 (← links)
- 05000313/LER-1980-012-03, /03L:on 800406,while Performing Monthly Inservice Valve Stroke Test,Emergency Feedwater Supply valves,CV2667 & CV2617,failed to Fully Open.Caused by Binding Due to Loose Bolts Securing Actuator (← links)
- 05000313/LER-1980-012, Forwards LER 80-012/03L-0 (← links)
- 05000313/LER-1980-009-03, /03L-0:on 800328,while Performing Surveillance Test,Lead Hydrogen Purge Supply fan,VSF-30A Tripped on Overload.Caused by Check Valve HPA-5 Being Stuck,Due to Corrosion from Seal Water Leaking Onto Valve (← links)
- 05000313/LER-1980-009, Forwards LER 80-009/03L-0 (← links)
- 05000313/LER-1980-011-03, /03L-0:on 800401,based on Sys Review Per IE Bulletin 79-14,certain Hangers Declared Inoperable.Cause Not Stated.Hangers Repaired or Modified within Required Time Limit on Affected Svc Water & Main Steam Sys (← links)
- 05000313/LER-1980-011, Forwards LER 80-011/03L-0 (← links)
- 05000313/LER-1980-008-03, /03L-0:on 800324,while Performing Surveillance Test,Bypass Flow Was Observed to Be Zero Due to Failure of CV-2126 in Closed Position.Caused by Blown Control Fuse.Fuse Replaced & Valve Proved Operable (← links)
- 05000313/LER-1980-008, Forwards LER 80-008/03L-0 (← links)
- 05000313/LER-1980-014, Forwards LER 80-014/03L-0 (← links)
- 05000313/LER-1980-006-04, /04L-0:on 800318,average Gross Release Rate for Jan-Mar 1980 Found to Be 4.3% of Max Permissible Concentration,Exceeding Tech Specs.Major Portion Caused by Reactor Bldg Purge in Jan (← links)
- 05000313/LER-1980-006, Forwards LER 80-006/04L-0 (← links)
- 05000313/LER-1980-010-03, /03L-0:on 800307,sys Reviews Per IE Bulletin 79-14 Found Hangers Inoperable.Cause Not Stated.Hangers Repaired & Mods Made by Revision to DCP 80-D-1207.List of Hangers Encl (← links)
- 05000313/LER-1980-010, Forwards LER 80-010/03L-0 (← links)
- 05000313/LER-1980-005-03, /03L-0:on 800306,during Scheduled Surveillance Test of P7-A,CV-2617 Valve Failed to Close Remote Electrically.Caused by Valve Binding in Closed Position. Valve Stem Repacked & Proper Operation Verified (← links)
- 05000313/LER-1980-005, Forwards LER 80-005/03L-0 (← links)
- 05000313/LER-1980-004-03, /03L-0:on 800205,during Operational Test for Leak Rates,Reactor Bldg Ventilation Penetrations V1 & V2 Found Leaking in Excess of Tech Specs.Caused by Maladjusted Valve Seats.Valves Readjusted & Retested (← links)
- 05000313/LER-1980-004, Forwards LER 80-004/03L-0 (← links)
- 05000313/LER-1979-002-01, /01T-0 on 790205:during Startup,Nuclear Instrumentation Was Not Calibr as Required by Tech Spec 4.1, Table 4.1-1.Caused by Personnel Error.Occurrence Discussed W/Shift (← links)
- 05000313/LER-1979-002, Forwards LER 79-002/01T-0 (← links)
- 05000313/LER-1980-002-03, /03L-0:on 800114,while Performing Surveillance Test,Hydrogen Purge Supply Isolation Valve CV-7448 Failed to Close.Caused by Oxidation on Torque Switch Contacts.Contacts Cleaned (← links)
- 05000313/LER-1980-001-03, /03L-0:on 800114,while Performing Surveillance Test,Hydrogen Purge Supply Isolation Valve CV-7444 Failed to Close.Caused by Oxidation on Torque Switch Contacts, Resulting in High Resistance to Closure.Contacts Cleaned (← links)
- 05000313/LER-1979-001-03, /03L-0 on 790112:during Mode 5 Operation,Purge Supply Flow from VSF-30B Would Not Meet Surveillance Requirements.Caused by Supply Filter VFA-20B Collapsing from Water Restricting Air Flow.Filter Changed (← links)
- 05000313/LER-1979-001, Forwards LER 79-001/03L-0 (← links)
- 05000313/LER-1979-004-03, /03L-0 on 790424:reactor Bldg Spray Pump Unresponsive to Engineered Safeguards Signal.Caused by Incorrect Agastat Time Relay Setting.Relay Adjusted (← links)
- 05000313/LER-1979-004, Forwards LER 79-004/03L-0 (← links)
- 05000313/LER-1979-011-01, /01T-0 on 790809:during NRC Performance Appraisal Team Interview,Discovered That Pressurizer Safety Relief Valve PSV-1002 Was Not Properly Tested in Mar 1978.Valve Retested 790812 W/No Adjustments Required (← links)
- 05000313/LER-1979-011, Forwards LER 79-011/01T-O (← links)
- 05000313/LER-1979-005-03, /03L-0 on 790524:during Leak Rate Testing, Penetration V-1 Leaked in Excess of 50,000 Cubic Cm/Minute. Caused by Buildup of Boric Acid Crystals on Valve Seating Surfaces.Repairs Made & Penetrations Retested (← links)
- 05000313/LER-1979-005, Forwards LER 79-005/03L-0 (← links)
- 05000313/LER-1979-006-01, /01T-0 on 790607:vendor Notified Util of Possibility That Turbocharger Thrust Bearing Could Be Damaged Under Certain Repeat Start Operating Modes. Procedures Modifided & Improved Lube Oil Sys Being Designed (← links)
- 05000313/LER-1979-006, Forwards LER 79-006/01T-0 (← links)
- 05000313/LER-1978-031, Forwards LER 78-031/03L-0 (← links)
- 05000313/LER-1979-023-03, /03L-0:on 791221,during Normal Makeup Operation, Boric Acid Pumps Left Operating,Resulting in Overboration of Reactor Coolant & Automatic Withdrawal of Rod.Caused by Reactor Operator Oversight.Operator Counseled (← links)
- 05000313/LER-1979-023, Forwards LER 79-023/03L-0 (← links)
- 05000313/LER-1980-003-01, /01T-0:on 800121,while at Cold Shutdown,Boron Buildups Identified on Loop B of Reactor Bldg Spray & Piping.Buildups Verified to Be Cracks in heat-affected Zone of Schedule 10 Pipe to Fitting Welds (← links)
- 05000313/LER-1980-003, Forwards LER 80-003/01T-0 (← links)
- 05000313/LER-1979-022-03, /03L-0:on 791119,during Plant Heatup to Hot Shutdown Conditions,Operational Test of Turbine Driven Emergency Feedwater Pump Not Performed.Caused by Scheduling Mistake.Startup Procedure Revised (← links)
- 05000313/LER-1979-024-03, /03L-0:on 791206,during Test of Turbine Driven Emergency Feedwater Pump,Pump Was Declared Inoperable.Caused by Loose Speed Governor Lock Nut on Turbine Pump Drive.Pump Speed Increased & Lock Nut Tightened (← links)
- 05000313/LER-1979-024, Forwards LER 79-024/03L-0 (← links)
- 05000313/LER-1978-032-03, /03T-0:on 781218,during Surveillance Test on Emergency Escape Hatch,Containment Integrity Violated.Caused by Personnel Error.Personnel Reminded to Exit Containment Personnel Hatch During Emergency Hatch Inner Door Repairs (← links)
- 05000313/LER-1978-032, Forwards LER 78-032/03T-0 (← links)
- 05000313/LER-1978-031-03, /03T-0:on 781214,barrel Test on Emergency Escape Hatch C4 & Personnel Hatch C2 Not Performed as Scheduled. Caused by Scheduling Error Due to Responsibility Change from One Supervisor to Another (← links)
- 05000313/LER-1978-006, Update to LER 78-006/01x-1:on 780305,during Reinstallation of Primary Manway Cover,Two of 16 Studs Sheared Off at Base of Nut on Second Torque Sequence Pass.Caused by 90% Crack in Diameter on One Stud (← links)
- 05000313/LER-1978-005, Update to LER 78-005/01x-1:on 780302,during Inservice Insp of Tubing,Five Tubes Exceeded Plugging Limit of 40% of Nominal Tube Wall Thickness.Caused by Oxiding Aqueous Corrosion Mechanism.Defective Tubes Plugged (← links)
- 05000313/LER-1979-017-03, /03L-0:on 790911,during Monthly Surveillance Operational Test,Diesel Generator 1 Tripped on Low Oil Pressure.Caused by Lube Oil Cooler Leak Allowing Water to Enter Oil Sys.Cooler Replaced (← links)
- 05000313/LER-1979-017, Forwards LER 79-017/03L-0 & Updates to 78-005/01X-1 & 78-006/01X-1 (← links)
- 05000313/LER-1979-014-99, /99X-0:on 790813,w/75% Reactor Power,Switchyard Relay 21Z1 Failed,Causing Turbine Trip.Caused by Lug Failure on Terminal Leads to Turbine Lockout Relay 286-T.Failed Lug Replaced,Terminals Tightened & Turbine Interlocks Teste (← links)
- 05000313/LER-1979-014, Forwards LER 79-014/99X-0 (← links)
- 05000313/LER-1979-008-03, /03L-0 on 790621:emergency Feed Actuation Received When once-through Steam Generator a Startup Level Transmitter Selection Was Shifted.Caused by Overspeed Trips Due to Water in Steam Supply Line (← links)
- 05000313/LER-1979-008, Forwards LER 79-008/03L-0 (← links)
- 05000313/LER-2018-004-01, Reactor Trip Due to the Loss of a Non-Vital 4160 Volt Bus (← links)
- 05000313/LER-1979-010-01, /01T-0 on 790714:design of Main Steamline Restraints Did Not Consider Steam Hammer Transient Forces. Review Performed.Overstressed Area Will Be Modified (← links)
- 05000313/LER-1979-009-03, /03L-0 on 790628:during Power Operation Reactor Bldg Hydrogen Purge Fan VSF-30A Tripped After 90 Minutes of 10-h Run.Caused by Overcurrent.Fan Restarted Using Less Sealing Water (← links)
- 05000313/LER-1979-009, Forwards LER 79-009/03L-0 & 79-010/01T-0 (← links)
- 05000313/LER-1979-007-03, /03L-0 on 790616:during Heatup,Emergency Feedwater Pump Automatically Started W/Inadvertent Actuation.Caused by Valve Lineup Error.Outboard Pump Bearing Found to Be Hot Due to Faulty Installation.Maint Procedure Revised (← links)
- 05000313/LER-1979-007, Forwards LER 79-007/03L-0 (← links)
- 05000313/LER-1979-012-03, Leak Rate Testing of Reactor Bldg Purge Valves at Penetration V-1 Indicated Leak Rate in Excess of Tech Spec Limits.Caused by Maladjusted Valve Seat Shims.Leak Rate Test Performed (← links)
- 05000313/LER-1979-021-03, /03L-0:on 791115,while Securing Makeup & Purification Sys,Inside Containment Isolation Seal Return Valve Failed to Fully Close on Demand.Caused by Valve Operator Torque Switch Failing to Make Up.Switch Replaced (← links)
- 05000313/LER-1979-021, Forwards LER 79-021/03L-0 & Updated LER 79-012/03X-1 (← links)
- 05000313/LER-1979-018-03, /03L-0:on 791008,tank Discharge Valve Failed & Control Valve 1616 Declared Inoperaple.Caused by Pinched Control Wire Blowing Fuse in Breaker Cubicle.Wire Reinsulated & Fuse Replaced.Craft Personnel Cautioned (← links)
- 05000313/LER-1979-018, Forwards LER 79-018/03L-0 (← links)
- 05000313/LER-1979-020-04, /04L-0:on 791017,excessive Radioactive Gas Release Occurred During Routine Makeup Tank Gas Space Sampling. Caused by Increase in Failed Fuel.Sampling Temporarily Discontinued & Procedures Being Revised (← links)
- 05000313/LER-1979-020, Forwards LER 79-020/04L-0 (← links)
- 05000313/LER-1979-019-03, /03L-0:on 791012,condensate Isolation Valve CV-1065 to Quench Tank Failed to Close from Control Panels C-16 & 18.Caused by Burnt Out Solenoid Coils.Replaced AC Coils by Coils & Tested Valve (← links)
- 05000313/LER-1979-019, Forwards LER 79-019/03L-0 (← links)
- 05000313/LER-1979-016-03, /03L-0:on 790827,diesel Generator 2 Tripped on Low Oil Pressure,Rendering Generator Inoperable.Caused by Leak Allowing Water to Enter Oil Sys,Causing High Crankcase Pressure.Oil Cooler Replaced (← links)
- 05000313/LER-1979-015-99, /99X-0:on 790817,as Result of Analysis of Seismic Category I Pipe supports,37 Restraints Were Identified to Have Safety Factor of Less than Two.Supports Modified (← links)
- 05000313/LER-1979-012, Forwards LER 79-012/03L-1 (← links)
- 05000313/LER-1979-013-03, /03L-0:on 790808,decay Heat Boron Concentration Was Not Monitored During Prescribed Interval & Inservice Decay Heat Loop Was Switched W/O Switching Sample Lineup. Caused by Communications Breakdown Between Depts (← links)
- 05000313/LER-1979-013, Forwards LER 79-013/03L-0 (← links)