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	Issue date	Title	Topic
05000000/LER-1977-005, Updated LER 77-005/1T:on 770114,failure of High Pressure Svc Water/Emergency Svc Water & Emergency Cooling Water Pumps to Meet FSAR Seismic Requirements Noted.Caused by Change in Calculation Techniques	28 January 1977	Updated LER 77-005/1T:on 770114,failure of High Pressure Svc Water/Emergency Svc Water & Emergency Cooling Water Pumps to Meet FSAR Seismic Requirements Noted.Caused by Change in Calculation Techniques
05000000/LER-1986-009, Ro:On 860312,discovered That LER 2-86-04 & LER 86-009 Not Submitted to Nrc.Caused by Misplaced Repts.Repts Telecopied to Nrc.Procedure for Distribution of Repts Revised	14 April 1986	Ro:On 860312,discovered That LER 2-86-04 & LER 86-009 Not Submitted to Nrc.Caused by Misplaced Repts.Repts Telecopied to Nrc.Procedure for Distribution of Repts Revised
05000263/LER-1975-016	5 September 1975	LER 75-16:on 750826,discovered That Control Circuit for Valve MO-2036,steam Supply to HPCI Turbine Deenergized. Caused by Relay Coil Which Open Circuited.Relay Coil Replaced in kind.W/750905 Ltr
05000263/LER-1976-011, Updated LER 76-011:on 760802 & 0830,during Test,Rcic Turbine Tripped on Overspeed.Caused by Steam Void in Discharge Piping Due to Valve Leakage from Feedwater Sys.Control Oil Sys Modified to Improve Control Valve Response	22 October 1976	Updated LER 76-011:on 760802 & 0830,during Test,Rcic Turbine Tripped on Overspeed.Caused by Steam Void in Discharge Piping Due to Valve Leakage from Feedwater Sys.Control Oil Sys Modified to Improve Control Valve Response
05000263/LER-1976-012, Updated LER 76-012:on 760805,generic ECCS Model Analysis Indicated 2200 F PCT May Be Exceeded at Reduced Core Flows. MAPLHGR 5% Reduction at Less than 90% Core Flow implemented.W/760910 Ltr	3 September 1976	Updated LER 76-012:on 760805,generic ECCS Model Analysis Indicated 2200 F PCT May Be Exceeded at Reduced Core Flows. MAPLHGR 5% Reduction at Less than 90% Core Flow implemented.W/760910 Ltr
05000263/LER-1976-018	22 September 1976	LER 76-18:on 760909,investigation of Drywell Torus Pressure Differential Effect on Torus Water Level Vol Correllation Disclosed Vol Slightly Below Tech Spec Limit.Water Vol Increased & New Vol Vs Level Correlation Issued
05000263/LER-1976-023	24 November 1976	LER 76-23:on 760912,surveillance Coordinator Could Not Locate Main Steam Line Radiation Monitor Functional Test Scheduled to Be Completed During Wk of 760912.Test Overlooked & Not Assigned for completion.W/761124 Ltr
05000263/LER-1977-003	9 February 1977	LER 77-03:on 770127,TIP Ball Valve Failed to Close During Use of Sys.Cause Undetermined.Valve Disassembled,Inspected & Found in Good condition.W/770209 Ltr
05000263/LER-1977-021	7 September 1977	LER 77-21:on 770810,CRD HCU 30-11 Nitrogen Charging Valve on Accumulator Would Not Hold Pressure.Caused by Leaking Stem Packing.Program Will Be Initiated to Replace Packing in Similar valves.W/770907 Ltr
05000263/LER-1977-022	27 September 1977	LER 77-22:on 770828,MO-2013 B RHR Injection Valve Failed to Open.Control Relays Installed in Breaker to Reduce Control Wire Voltage drop.W/770927 Ltr
05000263/LER-1977-023	7 October 1977	LER 77-23:on 770909,RHR Torus Cooling Valve Mo 2009 Failed to Operate Properly.Caused by Inadequate Stem Clamp Set Screws for Unseating Torque.Stem Clamp W/Keyway Being installed.W/771007 Ltr
05000263/LER-1977-024	18 November 1977	LER 77-24-7:on 770910,A Outboard MSIV Found Leaking in Excess.Caused by Plug Being Slightly Out of Round.Seats Lapped & Valve Retested
05000263/LER-1977-025	27 September 1977	LER 77-25:on 770913,recalculated ECCS Thermal Limits Found to Be More Restrictive than Tech Spec Limits.Limiting Break Size & Revised Thermal limits.W/770927 Ltr
05000263/LER-1977-026	11 October 1977	LER 77-26:on 770911,elbow on F SRV Discharge Line Found Deformed.Caused by Inadequate Restraint on Discharge Line. Addl Support Being Installed to Reduce Displacement of Line. W/771011 Ltr
05000263/LER-1977-027	21 October 1977	LER 77-27:on 770923,RHR Torus Cooling Valve Body Seat Ring Threads Found to Be Stripped.Caused by Rotation of Plug Which Unscrewed Seat.Mod in Process to Hold Seat in Place Using Bolding Ring Welded to Valve body.W/771021 Ltr
05000263/LER-1977-029	1 November 1977	LER 77-29:on 771002,three Main Steam Line Area Temp Switches Found to Trip Above Allowable Tech Spec Setting.Switches recalibrated.W/771101 Ltr
05000263/LER-1977-030	9 November 1977	LER 77-30:on 771010,discovered Leak from B RHR Loop Relief Valve 2005 2 Boss Connection.Caused by Excess Cyclic Moment Induced by Unrestrained Vibration During Shutdown Cooling Operation.Relief Restraint installed.W/771109 Ltr
05000263/LER-1977-031	27 October 1977	LER 77-31:on 771013,noted Torus Internal Catwalk Sections Not Attached in Same Manner.All Locations Will Be Upgraded to Design Requirements Prior to End of outage.W/771027 Ltr
05000263/LER-1982-004, Updated LER 82-004/01T-1:on 820410,inboard & Outboard 18-inch Dyrwell Vent Valves Failed to Close Upon Hand Switch Activation.Probably Caused by Solenoids Being Mounted Horizontally & Residual Core Magnetism.Solenoids Replaced	20 May 1982	Updated LER 82-004/01T-1:on 820410,inboard & Outboard 18-inch Dyrwell Vent Valves Failed to Close Upon Hand Switch Activation.Probably Caused by Solenoids Being Mounted Horizontally & Residual Core Magnetism.Solenoids Replaced
05000263/LER-1982-013, Updated LER 82-013/01T-3:on 820928,1020,31 & 1102,during Preparation for Repair of E,C & F safe-ends,thru Wall Leaks Found on Each safe-end.Caused by Intergranular Stress Corrosion Cracking.Defects Repaired	6 December 1982	Updated LER 82-013/01T-3:on 820928,1020,31 & 1102,during Preparation for Repair of E,C & F safe-ends,thru Wall Leaks Found on Each safe-end.Caused by Intergranular Stress Corrosion Cracking.Defects Repaired	Hydrostatic
05000263/LER-1984-011, Revised LER 84-011-01:on 840218,crack Indications Discovered in Listed Locations,Including RHR Sys & Recirculation Sys Pump Suction & Discharge Valves.Caused by Igscc.Stainless Steel 304 to Be Replaced	15 May 1984	Revised LER 84-011-01:on 840218,crack Indications Discovered in Listed Locations,Including RHR Sys & Recirculation Sys Pump Suction & Discharge Valves.Caused by Igscc.Stainless Steel 304 to Be Replaced	Non-Destructive Examination
05000263/LER-1993-008	30 August 1993	LER 93-008-00:on 930731,RPS Tripped from Reactor Low Water Level.Caused by Main Condensate Pump Trip.Condensate Pump 11 Motor Will Be Inspected & Preventive Maint Will Be Performed on Condensate Pump 11 breaker.W/930830 Ltr
05000277/LER-1976-011, Telecopy LER 76-011/01P:on 760219,allowable Gross Activity Gaseous Release Rate Exceeded Tech Spec.Caused by Xenon Gases Released During Filter Demineralizer Backwash.No Immediate Corrective Action Possible	19 February 1976	Telecopy LER 76-011/01P:on 760219,allowable Gross Activity Gaseous Release Rate Exceeded Tech Spec.Caused by Xenon Gases Released During Filter Demineralizer Backwash.No Immediate Corrective Action Possible
05000277/LER-1976-012, Telecopy LER 76-012/01P:on 760225,allowable Gross Activity Gaseous Release Rate Exceeded Tech Spec.Caused by Xenon Gases Released During Filter Demineralizer Backwash.No Immediate Corrective Action Possible	25 February 1976	Telecopy LER 76-012/01P:on 760225,allowable Gross Activity Gaseous Release Rate Exceeded Tech Spec.Caused by Xenon Gases Released During Filter Demineralizer Backwash.No Immediate Corrective Action Possible
05000277/LER-1976-015, Telecopy LER 76-015/01P:allowable Gross Activity Gaseous Release Rate Exceeded Tech Spec.Caused by Xenon Gases Released During Filter Demineralizer Backwash.No Immediate Corrective Action Possible	5 March 1976	Telecopy LER 76-015/01P:allowable Gross Activity Gaseous Release Rate Exceeded Tech Spec.Caused by Xenon Gases Released During Filter Demineralizer Backwash.No Immediate Corrective Action Possible
05000277/LER-1982-006	12 April 1982	LER 82-006/03L-0:on 820313,during Surveillance Testing of Fire Protection Sys,Diesel Fire Pump Tripped Off on Overspeed Condition.Caused by Defective Overspeed Control Switch.Defective Switch Replaced
05000277/LER-1982-008, Revised LER 82-008/01X-1:on 820328,auxiliary Boiler Operated on Diesel Fuel 2 Instead of Fuel Oil 6,decreasing Diesel Fuel Inventory Below Tech Spec Limit of 104,000 Gallons. Caused by Failure to Monitor Fuel Tank Inventory	15 April 1982	Revised LER 82-008/01X-1:on 820328,auxiliary Boiler Operated on Diesel Fuel 2 Instead of Fuel Oil 6,decreasing Diesel Fuel Inventory Below Tech Spec Limit of 104,000 Gallons. Caused by Failure to Monitor Fuel Tank Inventory
05000277/LER-1982-010, Sanitized Version of LER 82-010/01X-0:on 820413,Eberline Instrument Corp Reported 9.175 Rem Exposure to TLD Badge. Caused by Deliberate Tampering W/Badge Found Near Radiation Source.Individual Denied Access to Site	13 May 1982	Sanitized Version of LER 82-010/01X-0:on 820413,Eberline Instrument Corp Reported 9.175 Rem Exposure to TLD Badge. Caused by Deliberate Tampering W/Badge Found Near Radiation Source.Individual Denied Access to Site
05000277/LER-1982-012	11 June 1982	LER 82-012/03L-0:on 820517,pressure Drop Across Combined HEPA Filters & Charcoal Absorber Banks in Control Room Emergency Ventilation Sys Exceeded Tech Spec Limits.Caused by Pin on Connecting Linkage of Damper OBV-30 Falling Out
05000277/LER-1982-013	8 July 1982	LER 82-013/03L-0:on 820608,while Filling Diesel Generator Carbon Dioxide Fire Suppression Sys Storage Tank,Tank Pressure Dropped Below Tech Spec Limit.Caused by Venting Tank Vapor Space to Atmosphere Instead of Delivery Truck	Fire Watch
05000277/LER-1982-015	6 July 1982	LER 82-015/1P:on 820703,main Steam Line Flow Transmitter D & 1 of 4 Main Steam Line High Flow Transmitters Found W/Open Equalizing Valves.Cause Under Investigation.Valving of Instruments Verified
05000277/LER-1982-016	13 July 1982	LER 82-016/01P:on 820709,equalizing Valve on Main Steam Line a High Flow Transmitter (Dpis 116B) Found Open.Cause Under Investigation.Valving of Instrument Performance Verified
05000277/LER-1982-030, Telecopy Message of LER 82-030/01P:on 820917,contaminated Water Released from Recombiner Bldg Into Storm Drain Sys. Caused by Spurious Actuation of Fire Protection Sprinkler Sys in B Filter Train of Exhaust Ventilation Sys	21 September 1982	Telecopy Message of LER 82-030/01P:on 820917,contaminated Water Released from Recombiner Bldg Into Storm Drain Sys. Caused by Spurious Actuation of Fire Protection Sprinkler Sys in B Filter Train of Exhaust Ventilation Sys
05000277/LER-1984-003, Revised LER 84-003-01:on 840131,heatup Rate Exceeded Tech Spec Limits.Caused by Personnel Error.Operator Disciplined. Memo Issued to All Licensed Operators Re Tech Spec Rate	3 May 1984	Revised LER 84-003-01:on 840131,heatup Rate Exceeded Tech Spec Limits.Caused by Personnel Error.Operator Disciplined. Memo Issued to All Licensed Operators Re Tech Spec Rate
05000277/LER-1984-008, Revised LER 84-008-01:on 840427,standby Gas Treatment Sys Solenoid Valve SV-00009 Failed to Operate Properly, Preventing Fan a Inlet & Outlet Dampers from Opening.Cause of Solenoid Failure Under Investigation	24 July 1984	Revised LER 84-008-01:on 840427,standby Gas Treatment Sys Solenoid Valve SV-00009 Failed to Operate Properly, Preventing Fan a Inlet & Outlet Dampers from Opening.Cause of Solenoid Failure Under Investigation
05000277/LER-1987-016, Corrected LER 87-016-00:on 870820,isolations Occurred When Four of Eight 4 Kv Emergency Transformers Momentarily de-energized.Caused by Inadequate Concern for Potential Electrical Hazard by Maint Craft Supervision	28 September 1987	Corrected LER 87-016-00:on 870820,isolations Occurred When Four of Eight 4 Kv Emergency Transformers Momentarily de-energized.Caused by Inadequate Concern for Potential Electrical Hazard by Maint Craft Supervision
05000277/LER-1989-006, Corrected LER 89-006-00:on 890209 & 25,determined That Tubing to Containment Isolation Valve Installed W/Inadequate Support & Containment Atmosphere Control & Dilution Sys Not Per Applicable Installation Criteria.Controls Estab	9 May 1989	Corrected LER 89-006-00:on 890209 & 25,determined That Tubing to Containment Isolation Valve Installed W/Inadequate Support & Containment Atmosphere Control & Dilution Sys Not Per Applicable Installation Criteria.Controls Established
05000277/LER-1989-007, Corrected LER 89-007-00:on 890411,green Discoloration Discovered in Grease on Stabs of Control Fuses in Switchgear.Root Cause of Event Under Investigation.Stabs Lubricated W/Different Type of Approved Grease	9 May 1989	Corrected LER 89-007-00:on 890411,green Discoloration Discovered in Grease on Stabs of Control Fuses in Switchgear.Root Cause of Event Under Investigation.Stabs Lubricated W/Different Type of Approved Grease	Time of Discovery
05000277/LER-1990-013	27 June 1990	LER 90-013-00:on 900530,failure to Perform Tech Spec Surveillance Tests Since 891130 Discovered.Caused by Incorrect Std Practice.Tests Revised to Clarify Testing Requirements of Tech Spec 4.14.C.1.c.W/900627 Ltr	Time of Discovery
05000277/LER-1990-014	19 July 1990	LER 90-014-00:on 900620,RWCU Isolation Occurred During Pressurization of Sys Following Isolation Valve Maint.Caused by Design Weakness.Design of Instrumentation Reviewed & Procedural Controls enhanced.W/900719 Ltr	Packing leak
05000278/LER-1982-005	14 June 1982	LER 82-005/03L-0:on 820514,during Normal Operation,Reactor Operator Heard Relay in Primary Containment Isolation Sys Energize.Caused by Defective Component in Rosemount Model 510DU Slave Trip Unit.Instrument Replaced
05000278/LER-1982-007	21 June 1982	LER 82-007/03L-0:on 820519,during Operability Testing,Hpci Steam Inlet valve,MO-14,blew Fuses When Stroked & Turbine Stop valve,HO-5513,failed to Close in Response to Remote Trip Signal.Steam Inlet Valve Repacked & Switch Replaced
05000278/LER-1982-009	28 June 1982	LER 82-009/03L-0:on 820530,operator Lost Valve Indication Position on HPCI Sys.Caused by Blown Fuse in Instrument Panel Due to Shortened Solenoid Coil in Turbine Exhaust Drain Valve.Fuse Replaced & Valves Stroked
05000278/LER-1982-010	13 July 1982	LER 82-010/03L-0:on 820618,downscale Failure of Drywell 0-70 Psig Pressure Recorder Occurred.Caused by Blown 0.3 Ampere Fuse Installed on Positive Side of Power Supply to Transmitter Circuit Board.Fuse Replaced
05000278/LER-1982-011	13 July 1982	LER 82-011/03L-0:on 820620,fuse on Positive Leg to Transmitter Circuit Board Blew Causing Downscale Failure of Drywell 0-70 Psig Pressure Recorder.Caused by Intentional Ground Installed on Positive of Transmitter.Fuse Replaced
05000278/LER-1982-022, Revised LER 82-022/01X-1:on 821025-1102,RHR HX 3D Leaked Slightly Radioactive Water Into Intake Structure.Caused by Expansion Bellows Leak Between Inner Floating Head & Drain. HX Repaired	11 January 1983	Revised LER 82-022/01X-1:on 821025-1102,RHR HX 3D Leaked Slightly Radioactive Water Into Intake Structure.Caused by Expansion Bellows Leak Between Inner Floating Head & Drain. HX Repaired
05000278/LER-1983-008, Followup LER 83-008/01X-1:on 830214,during Refueling Outage, Surveillance Testing Indicated Combined Leakage for Listed Valves Exceeded Limits or Failed to Meet Requirements.Caused by Seat Surface Degradation	13 September 1983	Followup LER 83-008/01X-1:on 830214,during Refueling Outage, Surveillance Testing Indicated Combined Leakage for Listed Valves Exceeded Limits or Failed to Meet Requirements.Caused by Seat Surface Degradation	Scram Discharge Volume
05000278/LER-1983-018, Updated LER 83-018/03X-1:on 831117,control Rods 34-35 & 34-7 34-27 Exceeded Allowable Scram Insertion Time of 7 S.Caused by Failure of Scram Solenoid Valve in Both Hydraulic Control Units.Solenoids Replaced	10 February 1984	Updated LER 83-018/03X-1:on 831117,control Rods 34-35 & 34-7 34-27 Exceeded Allowable Scram Insertion Time of 7 S.Caused by Failure of Scram Solenoid Valve in Both Hydraulic Control Units.Solenoids replaced.W/840210 Ltr	Loctite
05000278/LER-1984-001, Revised LER 84-001-02:on 840106,turbine Exhaust Rupture Diaphragm Alarm Annunicated Following Startup of HPCI Turbine.Caused by Rupture of Inner Rupture Disc.Inner Rupture Disc Replaced	1 June 1984	Revised LER 84-001-02:on 840106,turbine Exhaust Rupture Diaphragm Alarm Annunicated Following Startup of HPCI Turbine.Caused by Rupture of Inner Rupture Disc.Inner Rupture Disc Replaced
05000278/LER-1990-007	18 July 1990	LER 90-007-00:on 900620,RWCU Isolated While Pressurizing Sys Following Isolation Valve Insp.Caused by Design Weakness. Design of Instrumentation Reviewed & Procedural Controls enhanced.W/900719 Ltr

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