05000301/LER-1993-004, Forwards LER 93-004-00 for Pbnp Re Operability Concern for Containment Accident Fan Bearing
05000266/LER-1995-003, Forwards LER 95-003 Re Inadvertent EDG Start
05000301/LER-1995-001, Forwards LER 95-001 Re Inadvertent EDG Start.Rept Describes Situation That Caused Normal Power Supply Breaker for Unit 2 Train A,4160 Volt Safeguards Bus to Open
05000301/LER-1992-005, Forwards LER 92-005-00,per TS 15.4.2.A.7(a) After Each ISI, Number of Tube Plugged or Repaired in Each SG Shall Be Reported to Commission as Soon as Practical. Rept Also Reported Per TS Table 15.4.2-1 & TS 15.4.2.A.7(b)
05000301/LER-1992-007, Forwards LER 92-007-00 for Point Beach Nuclear Plant Re Automatic Starting of Emergency DG G02 Following de-energization of 4,160 Volt Safeguards Bus
05000301/LER-1992-006, Forwards LER 92-006-00 for Point Beach Nuclear Plant,Unit 2, Re Inadvertent Actuation of non-safeguards Equipment Lockout
05000266/LER-1992-002, Forwards Response to NRC 921116 Request for Info Re CCW Sys & Ccvs,Per LER 92-002-00 & GL 83-28.Info Covers Classification of Auxiliary Sys Necessary to Ensure Safe Plant Shutdown
L-95-022, Requests one-time Exemption from App E Requirement to Exercise Onsite Emergency Plan for 1995
05000301/LER-1996-002-01, :on 961009,RHR Loop Declared Inoperable Due to CCW Leakage.Remaining Relief Valve Lines in CCW Sys Were Reviewed
05000266/LER-1996-008, :on 960806,inner Doors of Unit 1 Containment Upper Hatch Failed an Airlock Door Seal Test.Caused by Failure to Comply with Procedures TS-10A & TS-10A,App B. Containment Upper Hatch Repair Completed
05000266/LER-1996-009, :on 960912,discovered CCW Sys Does Not Conform W/Currently Applicable Design Basis for Closed Sys.Caused by Inadequate Design/Design Review.Valves CC-732A,732D & 732F Closed to Isolate Portion of Sys
05000266/LER-1992-007, :on 920818,RPS Engineered Safeguards Sys & Process Instrumentation within Cabinets Declared Inoperable. Caused by Friction Clip Assemblies Loaded Beyond Yield Point.Cabinet Bolting Upgraded
05000266/LER-1996-004, :on 960731,operation of Svc Water Sys Was Outside Design Basis.Caused by Deficient Original SW Sys Analysis.Operating Restrictions Were Established to Ensure Adequate SW Pump Availability
05000266/LER-1996-006, :on 960813,emergency Power Out of Service Coincident with Opposite Train SW Pump.Root Cause Evaluation Being Performed.C/As Will Be Determined as Necessary from Results of Root Cause Evaluation
05000301/LER-1996-001-01, :on 960518,reactor Trip Occurred Due to Spurious Closure of Turbine Stop Valves.Caused by Equipment Failure.Extensive Troubleshooting Performed,Valve Examined in Place,Removed & Replaced
05000266/LER-1996-005, :on 960801,determined Containment Fan Coolers Susceptible to SW Flashing.Caused by Original Design Not Analyzed for Transient Conditions Described.Util to Submit Formal Evaluation Re Plan for Mods to SW Sys
05000266/LER-1996-002, :on 960422,determined That steam-driven AFW Valves Were Shut.Caused by Poor Communication.Crew Discussion Re Valve Misoperation Occurred & Test Procedures Reviewed
05000301/LER-1992-003, :on 920918,Train a of Unit 2 Containment Spray Sys Rendered Inoperable.Caused by Spray Pump Impeller Suction Blocked by Foam Rubber Plug.Containment Spray Sys & Safety Injection Sys Remained Operable
05000266/LER-1992-004-01, :on 920515,discovered Improper Sequencing of Esf.Caused by Failure to Identify Need for Acceptance Criteria for Shared Components.Test Procedure ORT-3 Revised
05000266/LER-1996-003, :on 960621,discovered Plant Operation Outside of Design Basis.Caused by Inadequate Analysis Re Determination of Original TS Parameters.Revised Procedure OP-3C & OP-1A Re Cold Shutdowns
05000301/LER-1992-004-02, :on 920926,reactor Manually Tripped During Hot CR Drop Testing Due to Unexpected CR Buttom Indications. Caused by Lack of Communication.Cr Testing Terminated. Procedure Resp 1.1 Will Be Revised
05000301/LER-1992-003-02, :on 920918,abnormal Noise Heard Emanating from Containment Spray Pump P-14A During Test IT-06 Due to Pump Impeller Being Blocked.Pump Disassembled & Foam Rubber Plug Removed.Pump Reassembled & Declared Operable
05000266/LER-1992-006, :on 920531,SG a MSIV IMS-2018 Failed to Fully Close During Initial Test.Caused by Galling on Both Ends of Valve Shaft Due to Mispositioning of Gaskets.Msiv Instructions Will Be Updated & Revised
05000266/LER-1992-005, :on 920527,during Performance of Refueling Procedure Temp cool-down Limit Was Exeeded Per Ts.Caused by Personnel Error.Need to Perform SG Crevice Flushing in Future Will Be Assessed
05000266/LER-1996-001, :on 960405,inadvertent ESF Actuation in Train B Due to DC Sys Ground Occurred.Caused by Inadequate Ground Search Technique.Site Engineering Personnel Will Be Involved in Ground Detection Needed on DC Sys
05000266/LER-1992-008-01, :on 921005,automatic Turbine Trip & Reactor Trip Occurred.Caused by B Train Solenoid Vent Valve Being Open.Thorough Review of PC-11,Part 2 Performed.Vent Valve Replaced & Retested Satisfactorily
05000301/LER-1992-002-01, :on 920828,discovered That CCW Sys Isolation Valves LW-63 & 64 Not Capable of Performing Intended Function.Caused by Inadequate Design Review.Ccw Sys Boundary Outside Containment Reestablished
05000301/LER-1991-007-01, :on 911110,DHR Requirement Violated During SG Crevice Cleaning.Caused by Inadequate Procedural Guidance. Need to Continue Performing SG Crevice Cleaning Procedure Will Be Assessed
05000266/LER-1992-003-01, :on 920428,EDG G01 Automatically Started When Potential Transformer for Supplied Bus Deenergized.Caused by Personnel Error.Addl Loads on Bus 1B04 Secured & Isolated & Buses 1B03 & 1B04 Reenergized
05000301/LER-1995-006-01, :on 951125,PORV post-maint Testing Was Not Performed Prior to Establishing Ltop.Caused by Inadequate Control of post-maint Testing.Established TS Compliance by Venting RCS
05000301/LER-1995-004-01, :on 951026,inadvertent ESF Actuation Occurred as Result of Improper Relay Alignment.Assigned Addl Technician to Concurrently Check Proper Removal & Installation of Remaining Relays
05000301/LER-1995-005-01, :on 951025,plugged 46 Tubes Due to Degradation in Roll Transition,Tubesheet Crevice & Tube Support Plate Regions.Performed Closeout Insps Following Maint of Each Sg
05000266/LER-1995-005, :on 950416,CR Personnel Initiated Manual Reactor Trip When CR E11 Dropped Part Way Into Core During Troubleshooting Activities.Caused by Failed Stationary Gripper Coil.Coil Fuse Replaced
05000266/LER-1995-002-01, :on 950313,undervoltage Relays Inadvertently Actuated During Mod Work Re Installation of Addl Edgs.Caused by Loose Wire Pulled Out of Wire Lug.Wire Relugged & Relanded
05000266/LER-1995-001, :on 950228,unusual Event Declared & Load Decrease Commenced as Loss of DC Control Power Occurred in Two Accident Fan Coolers.Caused by Short Circuit.Affected Bulb,Socket & Fuses Replaced
05000301/LER-1995-002, :on 950304,loss of DC Control Power Resulted in Two Containment Accident Fan Coolers Being Inoperable.Caused by Short Circuit Due to Burned Out Indicating Lamp.Light Socket & Fuses Replaced
05000301/LER-1994-002-01, :on 940713,quarterly TS Test of PORV Block Valve Not Performed.Caused by Improper Temporary Change to IST Procedure IT-25.Temporary Change Approved on 940707
05000301/LER-1994-005-01, :on 941102,TS Violation Overtemperature at Minimum Degree of Redundancy Not Achieved.Caused by Condition of N42 Channel Not Identified Until Unit 2 Brought in Power.Delta T Channel Put in Trip Condition
05000266/LER-1994-010, :on 940927,inadvertent EDGs Start,Loss of Two Station Battery Chargers & Unit 2 Loss of DHR Occurred When Control Operator Operating Gas Turbine Incorrectly Manipulated Controls.Subj Equipment Restored
05000266/LER-1994-011, :on 941004,discovered That on 940409 Redundant DHR Requirements Not Met During Refueling Outage Due to Inadequate Communication to Operators Re Interpretation of TS 15.3.1.A.3.b.Both RHR Pumps Secured
05000301/LER-1994-003-01, :on 941010,800 Psid Leak Test Was Performed & Tubes,Mechanical Plugs & Explosive Plugs Observed to Have Leakage.Closeout Insp Were Performed & Tubes Were Replaced
05000301/LER-1994-004-01, :on 941006,RCS Chloride Sample Taken Outside Periodicity Required by TS Due to Incomplete Communications. RCS Sampled & Chloride Concentration Verified to Be within Acceptable Limit
05000266/LER-1994-008, :on 940812,discovered That Containment Integrity Requirements Not Satisfied During Valve Testing. Root Cause Evaluation Initiated & Procedures IT-40,IT-40A, IT-45 & IT-45A Revised
05000266/LER-1994-007, :on 940713,discovered That Containment Integrity Requirements Not Satisfied During Low Head SI Suction Valves Testing Due to Procedural Deficiency. Applicable IST Procedures Will Be Revised
05000301/LER-1994-001, :on 940323,identified Potential FW Flow Measurement Inaccuracies Due to Degradation in Signals from Leading Edge Flow Meter Transducers.Permanent Changes Made to Reactor Engineering Procedures 1.4 & 6.2
05000266/LER-1994-006, :on 940620,Halon Sys Declared Inoperable Due to Incorrect Operability Determination Following Spurious Halon Actuation on 940618.Caused by Nitrogen Leakage.Turbine Bldg Shift Log Will Be Revised
05000266/LER-1994-005, :on 940509,determined That Unit 1 Reactor Cavity Cooling Fans in Condition Potentially Outside Design Basis Due to Failure to Install Cooling Fan Assemblies. Assemblies Installed,Per Mod Request 94-032
05000266/LER-1994-004, :on 940427,unexpected Automatic Trip of Reactor Occurred During Hot Control Rod Drop Testing Due to Inadequate Work Control.Human Performance Root Cause Evaluation 94-016 Being Conducted on Event
05000266/LER-1994-003, :on 940217,reactor Coolant Sys Sample Line Declared Inoperable & Isolated.Caused by Failure of SC-955 as Result of Loss of Coolant Accident.Penetration P-28a on Units Isolated
05000266/LER-1994-001, :on 940208,automatic Actuation Feature of Halon Fire Suppression Sys for Afp Room & Vital Switch Room Disabled.Caused by Personnel Error.Hourly Fire Rounds Performed Until Halon Restored to Svc,
05000266/LER-1994-002, :on 940208,both EDG G02 Train B EDG Voluntarily Removed from Svc for Annual Maint.Caused by Power Fluctuations.Damaged Bus Bar & Jumper Wire Replaced
05000266/LER-1993-009, :on 931202,EDG G02 Declared Inoperable Due to Relay Malfunction in One of Redundant Starting Circuits. Testing & Insp of STLO-2 Relay Ongoing to Improve Understanding of Root Cause of Failure
05000301/LER-1993-005-01, :on 931119,molded Case Circuit Breakers Failed Test Due to Grease Solidification.Caused by age-related Grease Solidification in MCCB Tripping Mechanism.Mccb Tested & Schedule for Replacement
05000266/LER-1993-008, :on 930910,determined SW Valves Inoperable During Surveillance Testing Due to Instrument Air Tubing Improperly Connected to Associated Solenoid Valve.Returned Valve to Svc W/O post-maint Testing
05000266/LER-1993-007, :on 930726,inadvertent Emergency Diesel Start & Loss of Station Battery Charger Occurred Due to Blown Fuse During Calibr of 1A-06 Voltmeter.Blown Fuse Replaced & Instructions for Calibr Revised
05000266/LER-1992-003, Comments on Preliminary Draft of NUREG/CR-4674, Precursors to Potential Severe Core Damage Accidents:1992,Status Rept. Section B.14 of Draft NUREG Based on Unit 2 of LER 92-003
05000266/LER-1993-006, :on 930416,discovered That Outside CIV Not Leak Tested,Per TS 15.4.4.III.D Requirements Due to Review on 840202,recommending That Valve Be Tested During RHR Hydrostatic Testing.Subj Valve Replaced
05000266/LER-1992-009-01, Forwards Suppl LER-92-009-01 Re Ccws Surge Tank Vent Valves Being Outside Design Basis.Rept Provided to Rept Final Corrective Actions to Resolve Condition
05000301/LER-1993-003-01, :on 930328,Point Beach Unit 2 Tripped Due to Surveillance Testing Problems.Test Procedures Can Trip Unit Due to Equipment or Human Failure.Failure Tests Delayed Until Unit 1 & Knpp Restored to Power
05000266/LER-1993-004, :on 930408,employee Found Third Door to Unit 2 Containment Hatch Secured Open.Personnel Ignored Signs to Close Door While Refueling.Door Immediately Shut & Security Posted at Access.Fuel Procedures Modified
05000301/LER-1993-002, Forwards LER 93-002-00 Re Reactor Trip Which Occurred During Performance of Thrust Bearing Trip Test Portion of TS Test TS-4A, Turbine Trip Test (Monthly) Unit 2
05000266/LER-1993-003, :on 930319,discovered That Setpoints for Low Temp Overpressure Sys Nonconservative.Caused by Failure to Recognize RCS Pressure Transmitters in Subj Sys Development Analysis.Operations Special Order Issued
05000266/LER-1993-002, :on 930218,both EDG Declared Inoperable Due to Blown Fuse.Blown Fuse in Metering Circuit Replaced & Operating Instruction OI-35, Electrical Equipment Operation Revised
05000301/LER-1993-001-02, :on 930127,discovered Failure of SG Sample Isolation Valve to Fully Shut.Caused by Inadequate Compression in Operator Spring.Operator Spring Compression Was Increased by Turning Adjustment Screw
05000301/LER-1994-001-01, :on 940323,identified That Feedwater Flow May Have Been Underestimated Since Beginning of Operating Cycle. Caused by Degradation of Signals from Transducers.Transducer Replaced
05000266/LER-1994-009, :on 940909,EDG G-02 Inadvertently Started & Station Battery Charger D-08 Tripped Off Due to Blown Fuse. Caused by Inadequate Procedure.Blown Fuse Replaced & Electrical Distribution Sys Restored to Normal