05000255/LER-1979-010-03, /03L-0 on 790207:during Resin Sluicing Operations, Manual Isolation Valve (MV-CVC502) Was Left Open,Resulting in 17 Gpm Leak to Radwaste Sys.Caused by Broken Valve Stop. Valve Stop Will Be Replaced
05000219/LER-1982-049, Forwards LER 82-049/03L-0.Detailed Event Analysis Encl
05000272/LER-1983-062, Supplemental LER 83-062/99X-1:on 831122,during Testing on Seismic Instrumentation,Triaxial Time History Accelograph Did Not Respond as Required.Caused by Detector Failure. Accelerometer Replaced
0CAN109602, Application for Amends to Licenses DPR-51 & NPF-6,reducing Costs for Licensees by Allowing Change to Requirements W/O Necessarily Requiring License Amend,Per GL 95-10
05000220/LER-1985-002, :on 850214,auxiliary Control Room Fire Suppression Sys Inoperable.Caused by Inoperable Fire Dampers.Fire Dampers Repaired & Tested.Personnel Instructed in Tech Spec Requirements
05000250/LER-1982-021-03, /03L-0:on 820511,self-initiated Audits Revealed Inadequate Surveillance of Emergency Diesel Generators for Tests Required by Tech Spec 4.8.1.a.5.Caused by Inadequate Review of Operating Procedure 4304.1
05000250/LER-1983-025-03, /03L-0:on 831216,during Cold Shutdown,Spurious Safeguards Actuation Signal Received & Emergency Diesel Generator B Failed to Start.Caused by Diesel Air Pressure Regulator Malfunction.New Regulator Installed
05000305/LER-1983-033-03, /03L-0:on 831205,motor Operated Isolation Valve SI-2A in Boric Acid Suction Line to Safety Injection Pump Failed to Open During Monthly Surveillance Test.Caused by Broken Finger in Auxiliary Contact Block
05000261/LER-1977-007, :on 770422,isolation Valve for Compressed Air Supply Discovered Closed.Caused by Personnel Error.Valve Opened.Penetration Pressurized
05000261/LER-1977-006, :on 770326,during 0% Power,Valve V2-14A Failed to Open While Attempting to Feed Steam Generator a Through Valve W/Steam Driven Auxiliary Feedwater Pump.Caused by Binding Valve Seat Surfaces.Valve Recycled
05000261/LER-1976-011, :on 760412,boric Acid Transfer Pump B Tripped. Caused by High Pump Temp Cutout.Setpoints Reduced to Approx 175 F & Pump Returned to Svc
05000219/LER-1983-007-03, /03L-0:on 830418,during Monthly 10 H Operability Test of Standby Gas Treatment Sys Ii,High Differential Pressure Across Both HEPA Filters Observed.Caused by Plugging of Filters.Filters Replaced
05000261/LER-1983-030-03, /03L-0:on 831129,two Degraded Voltage Relays for Emergency Bus E-2 Found Out of Tolerance During Calibr. Caused by Instrument Drift.Instrument Calibr
05000305/LER-1983-031-03, /03L-0:on 831121,during Full Power Operation,Irpi Channel for Rod J-10 Removed from Svc for Maint.Caused by Remote Indicator Span Drifting High.Indicator Span Recalibr
05000272/LER-1983-062-99, /99X-0:on 831122,triaxial time-history Accelograph Inside Bioshield on 81-ft Elevation of Containment Bldg Failed.Cause Not Stated.Accelerometer Will Be Replaced During Next Outage
05000305/LER-1983-034-03, /03L-0:on 831206,containment Fan Coil Unit 1D Removed from Svc to Repair Svc Water Leaks.Caused by Sand & Water Erosion of Return Bends in Svc Water Cooling Coils. Affected Bends Replaced
05000305/LER-1983-032-03, /03L-0:on 831201,containment Spray Pump Breaker 1B Failed to Close When Requested During Monthly Pump & Valve Surveillance Test.Cause Unknown.Pump Monitored
05000255/LER-1983-077-03, /03L-0:on 830812,w/control Rods Withdrawn & at Less than 1% Power,Temp Average Fell Below 525 F Limit. Caused by Corrective Actions Taken to Compensate for Turbine Bypass Valve Problems
05000305/LER-1983-030-03, /03L-0:on 831117,sampling Pump for Containment Gaseous & Particulate Radiation Monitor R-11 Failed to Operate.Caused by Bare Wires Shorting Out Paper Drive Fast Speed Motor.Fast & Slow Speed Motors Replaced
05000261/LER-1983-032-03, /03L-0:on 831104,during Testing of Porvs,Valve PORV-456 Failed to Meet Required Cycle Time.Caused by Limit Switch Improperly Adjusted.Limit Switch Adjusted & Small Air Leak Repaired
05000255/LER-1983-074-03, /03L-0:on 831109,during Shutdown for Refueling, Valves Failed to Meet as-found Acceptance Criteria.Caused by Adjustments Made to Valve Blowdown Ring.Test Procedure Will Be Revised
05000250/LER-1983-021-03, /03L-0:on 831109,during Replacement,Three Auxiliary Feedwater Steam Supply Piping Check Valves Found to Be Schedule 40 Piping Instead of Schedule 80.Lines Meet Acceptance Criteria
05000305/LER-1983-027-03, Cooling Water HX 1A Removed from Svc to Repair Leak.Caused by Sand Erosion.Line Patch Welded & Tested.Hx Returned to Svc
05000255/LER-1983-070-03, /03L-0:on 830813,w/shutdown Cooling Sys Isolation Valves MOV-3015 & MOV-3016 Open,Overpressure Protection Not Provided.Caused by Inadequate Procedures.Tech Spec Change Implementation Will Be Revised
05000305/LER-1983-026-03, /03L-0:on 831025,while Performing Monthly Pump & Valve Surveillance Test,Status Light on RHR Pump 1A Failed to Light When Pump Started.Caused by Failure of Stationary Auxiliary Switch to Fully Close
05000305/LER-1983-028-03, /03L-0:on 831028,charging Pump 1B Removed from Svc & Isolated Due to Hairline Crack Discovered in Discharge Head.Caused by Matl Fatigue at Socket Weld Due to Vibration. Piping Cut Out.New Section Welded in Place
05000250/LER-1983-019-03, /03L-0:on 831008,RHR Flow Isolated Due to Pressure Transmitter PT-3-405 Exposure to Hydrostatic Test Pressure of 3,100 Psig.Caused by Unclear Drawing Configuration of Loop a Sample Line.Transmitter Replaced
05000250/LER-1983-020-03, /03L-0:on 831011,while Reviewing off-normal Procedure,Deficiency Identified Which Could Lead Operators to Incorrectly Align Seal Cooling Water to RHR & Containment Spray Pumps While Swapping Headers
05000255/LER-1983-066-03, /03L-0:on 831005,total Leakage from Penetrations & Isolation Valves Exceeded Tech Spec Limit.Caused by Degradation of Seals & Gaskets on Boundaries.Sealing Surfaces & Personnel Air Lock Seal Replaced
05000305/LER-1983-029-03, /03L-0:on 831111,auxiliary Feedwater Pump 1A Placed in Pullout for Maint Work on Discharge Flow Control Valve Which Would Not Open Greater than 90%.Event Placed Plant in Degraded Mode.Vol Booster Recalibr
05000251/LER-1983-013-03, /03L-0:on 830825,while Performing Safeguards Test, Emergency Load Sequencer 4A Failed.Caused by Normal End of Life for open-circuited Timer 4A.Agastat Relay Replaced & Sequencer Tested & Returned to Svc
05000255/LER-1983-061-03, /03L-0:on 830910,11 & 16,several Hourly Fire Tours in safety-related Areas Not Completed within Required Period.Caused by Personnel Error.Fire Tours Reestablished
05000251/LER-1983-010-03, W/Unit in Shutdown,Steam Generator 4A Steam Supply Valve MOV-4-1403 to Auxiliary Feedwater Pump B Failed to Open in Response to Auto Start Signal.Caused by Carbon Buildup
05000251/LER-1983-022-03, /03L-0:on 831219,routine Sample of Boric Acid Storage Tank Boron Concentration Revealed Three Tanks Exceeding Tech Spec Limits.Caused by Lack of Communication Between Chemistry & Operations Personnel
05000255/LER-1983-064-03, /03L-0:on 830916,during Routine Surveillance Test, as-found Lift Pressure of Pressurized Relief Valve RC-1039 Exceeded Acceptance Criteria Range.Cause Unknown.Valve Lift Setting Adjusted to Proper Value
05000255/LER-1983-062-03, /03L-0:on 830828,while Plant Shut Down for Refueling,Routine Refueling Duration Surveillance Revealed Unpredictable Zero Shifts in Pressurizer Pressure Transmitters.Caused by Inaccurate Settings
05000255/LER-1983-059-03, /03L-0:on 830816,during Leak Rate Testing, as Found Leakage from Penetration & Isolation Valves Exceeded Tech Specs.Caused by Inadequate Number of Penetration Valves.Isolation Valve Added
05000255/LER-1983-058-03, /03L-0:on 830802,during Normal Power Operation, T-82B,safety Injection Tank B,Level Dropped Below Tech Spec Limit of 186 Inches.Caused by Leakage Past T-82B Fill & Drain Valve During Sampling Evolution of T-82D
05000251/LER-1983-007-03, /03L-0:on 830803,during Routine Temp Reduction on Pressurizer Relief Tank Prior to Pumping,High Level Alarm Received Followed by Rupturing of Rupture Discs.Caused by Overpressurization.Ruptured Disc Replaced
05000305/LER-1983-016-03, /03L-0:on 830713,filter Assembly Heater Failed to Energize.Caused by Blown Fuse in Control Circuit.Fuse Replaced
05000255/LER-1983-050-03, /03L-0:on 830707 & 08,safety Injection Tank T-82D Sample Showed Boron Concentration Below Tech Spec Limit. Caused by Leakage Past Loop & Safety Injection Tank Check Valves or Fill & Drain Valve
05000305/LER-1983-005-03, During Surveillance Test on Diesel Generator 1B,svc Water Outlet Cv (SW-301B) from Diesel Oil Cooler Failed to Open Fully When Diesel Started. Caused by Erosion of Ball,Causing Sticking.Valve Replaced
05000250/LER-1983-009-03, /03L-0:on 830610,during Operability Test of Auxiliary Feedwater Pump A,Pump Failed to Come Up to Speed & No Flow Delivered.Caused by Failed Differential Pressure Transmitter.Transmitter Replaced
05000305/LER-1983-006-03, /03L-0:on 830221,ICS Sys Train B Inadvertently Activated When Technician Depressed Test Lightbulb in Preparation for Performing Safeguards Logic Test.Action Resulted in Decreased Tank Level.Procedure Revised
05000305/LER-1983-001-01, Electrician Performing Corrective Maint Pulled Fuse to de-energize SV33379 Leaving CV31394 Caustic Additive to Containment Spray Sys Isolation Valve in Open Position.Design Change Initiated
05000255/LER-1983-010-03, /03L-0:on 830127,during QA Audit of Completed Tech Spec Surveillances,Quarterly Check of Diesel Fire Pump Batteries for May 1982 Found to Have Exceeded Due Date by 2 Days.Caused by Personnel Error
05000244/LER-1982-015-03, /03L-0:on 820622,at steady-state 100% Operation, Periodic Test Identified Faulty Sealing of Containment Gas Radiation Monitor Return Line Check Valve.Caused by Dirt Deposits from Veins of Monitor Pump
05000244/LER-1982-014-03, /03L-0:on 820624,discharge Check Valve 862B on Containment Spray Pump Failed to Close at Required Differential Pressure.Caused by Wear on Pin & Swing Arm. Parts Will Be Replaced During Next Outage
05000305/LER-1983-002-03, /03L-0:on 830126,during Full Power,Diesel Generator Removed from Svc to Repair Leaks in Cooling Sys Hx.Caused by Corrosion on Svc Water Side of Cooling Water Hx.Two Tubes Plugged & Four Tube Sheet Faces Repaired
05000305/LER-1983-004-03, /03L-0:on 830204,water Found Dripping Into Controller for Valve AFW-10 During Investigation of Battery Ground Fault Condition on Battery 1A.Caused by Wet Rags Stuffed in Newly Drilled Holes in Concrete Wall
05000219/LER-1983-005-03, /03L-0:on 830126,while Performing Containment Spray Sys Automatic Actuation Test,High Drywell Pressure Switches IP15A,B & C Tripped at Value Greater than Tech Spec Limit.Cause Not Determined.Pressure Switches Readjusted
05000251/LER-1982-014-03, /03L-0:on 821003,boron Injection Tank Circuit Found Below Tech Spec Limit of 145 F.Plant supervisor- Nuclear Not Promptly Notified.Caused by Inadequate Training & Info Dissemination to Personnel
05000255/LER-1983-004-03, /03L-0:on 830106,PCS Leak Rate Calculation Indicated Unidentified Leakage Exceeding Tech Spec.Caused by Improperly Seated CV-2056.Valve Cycled & Proper Seat Obtained
05000305/LER-1983-001-03, /03L-0:on 830105,during Full Power Operation, Electrician Performing Maint Pulled Fuse to de-energize SV33379 Which Allowed Caustic Additive to Drain from Tank to Suction of Containment Spray Pumps
05000219/LER-1982-057-03, /03L-0:on 821118,during Backsetting of Valve V-14-37,circuit on Terminal Block Failed Making Isolation Condenser 2 Inoperable.Caused by Stripped Thread on Screw & Circuit Backplate.Screw & Backplate Replaced
05000244/LER-1982-019-03, /03L-0:on 820901,while Performing PT-2.9, Containment Particulate/Gas Radiation Monitor R11/12 Return Line Isolation Check Valve CV-1599 Found Leaking Excessively.Caused by Graphite in Valve & Valve Disc Wear
05000255/LER-1982-027-03, /03L-0:on 820901,procedural Inadequacies Discovered Which Could Cause Reduction in Degree of Redundancy in Containment Cooling Sys.Procedures Revised to Require Fans to Be Declared Inoperable If Stopped
05000244/LER-1982-017-03, /03L-0:on 820803,during Surveillance Testing of RHR Pump B at 100% steady-state Power,Leakage from Mechanical Seal Exceeded Tech Spec Limit,Rendering Pump Inoperable.Caused by Degradation of Seal Due to Normal Wear
05000244/LER-1982-016-03, /03L-0:on 820722,containment Spray Pump B Discharge Check Valve Failed to Seat at Required Differential Pressure.Caused by Wear on Pin & Swing Arm of Swing Check Valve.Delivery of Replacement Parts Delayed
05000261/LER-1981-008-03, /03L-0:on 810225 While Performing Monthly Periodic Test CPL-PT-5.5,Hagan Signal Comparator Module Found Inoperable.Cause Not Stated.Comparator Replaced
05000261/LER-1982-008-03, /03L-0:on 820710,summator NM-412C Found Inoperable During Periodic Test 5.1.Caused by Summator Failing to Zero Output.Summator Replaced
05000251/LER-1982-010-03, /03L-0:on 820713,camera Insp of Steam Generators Revealed Foreign Objects & Minor Tube Damage.Leak & Minor Tube Damage Caused by Foreign Objects Near Tube Sheet Elevations.Metal Impact Monitoring Sys Installed
05000155/LER-1982-020-03, /03L-0:on 820622,reactor Depressurizing Sys Isolation Valves on Two of Four Loops Not Returned to Operable Status.Caused by Slide Links Inadvertently Left Open,Due to Operator Error
05000250/LER-1982-009-03, /03L-0:on 820617,tritium Activity Weekly Sampling Tests Not Performed.Caused by Out of Svc Liquid Scintillation Machine.Samples Counted on 820621.Normal Levels Recorded
05000155/LER-1982-012-03, /03L-0:on 820402,backup Compressed Gas Supply for Valves in One Loop of Containment Vacuum Relief Sys Failed to Maintain Adequate Pressure When Air Instrument Sys Was Vented.Caused by Unreliable Seating Characteristics
05000250/LER-1982-002-03, /03L-0:on 820216,while Performing Periodic Test of Fire Pumps,West Pump Failed to Automatically Start at Min Accepted Starting Pressure.Caused by Trip Switch & Gauge Being Out of Calibr.Recalibr Performed & Pump Tested
05000155/LER-1982-005-03, /03L-0:on 820219,during Cold Shutdown,Leak Occurred at Threaded Fitting to Suction Side Relief Valve of Control Rod Drive Pump 1.Caused by Pipe Crack as Result of Fatigue from Vibration in Displacement Pump Sys
05000206/LER-1982-007-03, /03L-0:on 820208,south Saltwater Cooling Pump (G13B) Declared Inoperable.Caused by Random Failure of Discharge Pressure switch,PS-39.Pressure Switch Replaced
05000155/LER-1982-004-03, /03L-0:on 820210,trip Point for Low Level Trip Sensor Lt 3180 Found to Operate 2 Inches Below Setpoint. Cause of Calibr Drift Unknown.Unit Recalibr & Returned to Operable Status
05000219/LER-1982-006-01, /01T-0:on 811203,one Trip Sys in Automatic Depressurization Sys Rendered Inoperable by Removal of Dc Control Power Fuses.Caused by Nonrating of Microswitches Inside IA83-A Replacement.All EMRV Switches Replaced
05000251/LER-1981-017-03, /03L-0:on 811222,boron Injection Tank Circuits Found Out of Calibr.Cause Unknown.Open Circuit Repaired, Tested & Returned to Svc
05000250/LER-1981-015-03, /03L-0:on 811112,during Maint on B Emergency Diesel Generator,Both a & B Emergency Diesel Generators Were Inoperable.Caused by Broken Diaphragm in Starting Air Solenoid.Solenoid Replaced & Generator Returned to Svc
05000255/LER-1981-045-03, /03L-0:on 811010,power Supply Cable to Fire Protection Sys Annunciator Panel Failed W/Resultant Loss of Alarm Capability.Caused by Damage to Cable by Lines Used in Installation of Equipment.Cable Repaired
05000155/LER-1981-018-03, /03L-0:on 810822,leaking Solenoid Valve Discovered in Twin Offgas Monitors Used to Supply Purging Air to Sys. Caused by Worn Parts in Asco(Model 8320A88) three-way Solenoid Valve.Parts Replaced & Periodic Maint Scheduled
05000213/LER-1981-014-03, /03L-0:on 810901,cooling Sys Tube Leak on Emergency Generator 2B Necessitated Removal from Svc.Cause Not Stated.Cooler Is Mfg by Young Radiator Co (Model XF-1303-TR-ZP).Failures Are Being Monitored
05000219/LER-1982-059-03, /03L-0:on 821124,reactor Circulation Pump a Taken Out of Svc.Caused by Indications of Leaking Seals.Seal Confirmed to Be Leaking During Subsequent Shutdown. Cartridge Assembly Replaced
05000255/LER-1982-048, Forwards LER 82-048/03L-0.Detailed Event Analysis Encl
05000155/LER-1982-024-03, /03L-0:on 820811,120-s Initiation Timer for One of Four Sensor Channels Failed to Trip During Monthly Reactor Depressurization Sys Testing.Caused by Defect in Timer Operation Due to Failure of Integrated Circuit Unit
05000251/LER-1983-004-03, /03L-0:on 830526,valve MOV-4-1405 Failed to Open During Routine Test of Auxiliary Feedwater Pump B.Caused by High Resistance Across Contacts Inside Motor Operator. Contacts Cleaned & Valve Tested
05000213/LER-1983-009-03, /03L-0:on 830505,charging Pump a Could Not Be Manually Rotated for Routine Surveillance Test.Caused by Binding Due to Solidified Boric Acid.Pump Uncoupled from Motor & Turned Over
05000213/LER-1983-011-03, /03L-0:on 830504,during Surveillance Testing,Hpsi Pump a Failed to Reach Shutoff Head of 1,400 Psi,Per Procedure Sur 5.1-4.Caused by Incorrect Acceptance Criteria. Procedure Revised
05000213/LER-1983-010-03, /03L-0:on 830507,following Svc Water Low Flow Alarm,Svc Water Filters Indicated 0 Psi.Caused by Filter B Plugging Up W/River Silt Due to Rain & High River Conditions.Filter a Cleaned
05000244/LER-1983-018-03, /03L-0:on 820126,RCS Average Temp Reduced to Less than 350 F & Both Reactor Coolant Pumps Inoperable.Caused by Personnel Failure to Incorporate Tech Specs
05000213/LER-1981-016-03, /03L-0:on 810927,during Cooldown for Refueling RHR Sys,Leakage Exceeded Tech Spec.Caused by Loose Body Bolting on RHR Purification Root Isolation Valve.Body Bolts Tightened
05000251/LER-1981-009-03, /03L-0:on 810728,bus 4A Failed to Transfer Properly (Startup Acb 4AA05 Did Not Close After Auxiliary Acb 4AA02 Tripped).Probably Caused by Transfer Inhibit Relay 162/4A2 W/Loose Crimp on Coil Wire.Relay Replaced
05000251/LER-1981-008-03, /03L-0:on 810717,while Performing Instrumentation Repairs on Pressurizer Spray Valve PCV-4-455B,RCS Leakage Discovered in Unused & Capped Packing Leakoff Line.Caused by Failure of Stem Seal Bellows & Crack in Nipple
05000261/LER-1981-004-03, Primary Coolant Sys Leak Found.Caused by Sample Cooler Tube Bundle Leakage Due to Normal Wear.Bundle Replaced.Review of Maint Records Revealed No Generic Problems
05000213/LER-1981-010-03, /03L-0:on 810704,charging Pump B Found Leaking Oil.Caused by Vibration Which Cracked Hardened Pipe Thread Sealing Matl.Two Nipples & Union Replaced
05000335/LER-1981-028-03, /03L-0:on 810522,during Normal Operations,One of Two Chlorine Detectors in North Control Room Air Intake Failed.Caused by Clogging of Wick.Wick Replaced
05000155/LER-1981-011-03, /03L-0:on 810612,vacuum Relief Capability for Containment Bldg Exhaust Loop Was Inoperable on 810612,16 & 18.Cause Not Stated
05000261/LER-1981-015-03, /03L-0:on 810525,computer Box FM-475 Found to Be Out of Acceptable Tolerances & Several Checkpoints Showed Erratic Readings During Loop a Steam Flow Channel Investigation.Caused by Two Worn Electronic Components
05000261/LER-1981-013-03, Determined Containment Isolation Valves Not Tested in Required Manner.Seven of Eight Valves Functioning as Designed.Eighth Valve Tested & Shown Operable.Test Undergoing Revision
05000155/LER-1981-001-03, /03L-0:on 810102,during Specific Gravity Checks, Cell 56 of Reactor Depressurizing Sys Battery for Channel D Had Reading Below 1.200 & Failed to Respond Adequately to Equalizing Charge.Cause Not Known.Cell Replaced on 810108
05000244/LER-1981-010-03, /03L-0:on 810420,leaking Relief Valve Was Found on Letdown Sys.Caused by Cracked Bellows Due to Increasing Differential Pressure as Result of Crud Buildup.Valve Repaired & Reinstalled
05000219/LER-1981-019-03, /03L-0:on 810328,during Normal Shutdown Sequence, IRM Calibr Was Not Performed as Required by Tech Specs. Caused by Procedural Inadequacy.Procedures Will Be Revised
05000213/LER-1981-002-03, /03L-0:on 810322,operator Noticed Mar Readings of HPSI Pump Closed Discharge Pressure Had Not Been Plotted. Caused by New Operators Not Knowledgeable About Test or Requirements & Procedure Not Spelled Out
05000155/LER-1980-041-03, /03L-0:on 801123,during Containment Type C Component Leak Rate Tests,Reactor Cleanup Sys Resin Sluice Valves CV4092 & CV4093 Exhibited Excessive Leakage.Caused by Minor Wear on Seat of Each Valve.Ball Disc & Seats Replaced
05000213/LER-1978-005-03, /03L-0:on 780403,HPIS Pump a Dragged During Manual Operation to Check Coupling Alignment.Caused by Cracked Wear Rings & Impeller Bushing.All Rings & Bushings Replaced.Pump re-assembled,test Run & Found Acceptable
05000213/LER-1978-007-03, /03L-0:on 780504,pinhole Leak Found in Pumps Discharge Recirculation Orifice Bypass Valve.Caused by Severe Erosion Due to Valve Design.Valve Replaced & Better Design Under Investigation
B10241, Forwards Reactor Containment Bldg Integrated Leak Rate Test, Per Section V.B. of App J to 10CFR50 & Facility Tech Spec 6.9.2.b
05000155/LER-1980-012-03, /03L-0:on 800507,intermittent Automatic Test Circuit Alarmed.Caused by Setpoint Drift in Conservative Direction on Reactor Level Transmitter.Unit Readjusted by Venting & Rezeroing Transmitter
05000155/LER-1980-014-03, /03L-0:on 800512,sensor Channel D of Reactor Depressurizing Sys Was Removed from Svc to Correct Problem Following Intermittent Automatic Test Circuit Alarms.Caused by Setpoint Drift.Unit Readjusted
05000155/LER-1980-016-03, /03L-0:on 800527,sensor Channel D of Reactor Depressurizing Sys Was Removed from Svc to Correct Problem Following Intermittent Automatic Test Circuit Alarms.Caused by Setpoint Drfit.Unit Readjusted
05000155/LER-1980-015-03, /03L-0:on 800515,sensor Channel D of Reactor Depressurizing Sys Was Removed from Svc to Correct Problem Following Intermittent Automatic Test Circuit Alarms.Caused by Setpoint Drift.Unit Readjusted
05000155/LER-1980-008-03, /03L-0:on 800411,following Intermittent Automatic Test Circuit Alarms,Sensor Channel D of Reactor Depressurizing Sys Was Removed from Svc to Correct Problem. Caused by Drift.Unit Was Readjusted
05000155/LER-1980-001-03, /03L-0:on 800114,temp Data for Loop 2 of Emergency Condenser Sys Revealed Through Seat Leakage on Normally Closed Outlet Valve M07053.Cause to Be Investigated at Future Shutdown
05000155/LER-1980-003-03, /03L-0:on 800123,following Automatic Test Circuit Alarm Indication,Channel D of Reactor Depressurizing Sys Removed from Svc for Troubleshooting.Caused by Automatic Test Circuit Component Failure
05000213/LER-1979-003-03, /03L-0 on 790215:diesel Fire Pump Failed to Start. Caused by Overload of Starter Motor Coil,Which Burned Open. Pump Reassembled & Starter Motor Rewound
05000155/LER-1979-029-03, /03L-0:on 791215,neither Plant Ventilation Exhaust Fan Operating During 8-minute Planned Activity.Caused by Turning Off Fans to Facilitate Maint.Tech Specs Will Be Revised
05000155/LER-1979-024-03, /03L-0:on 790913,set Points for Pressure Switches on Reactor Depressurizing Sys Pump Discharge Drifted Below Tech Spec Requirement.Cause Not Known.Pressure Switches Were Reset to Trip at 105 Psig
05000255/LER-2077-042, License Event Reports 1977-042-00 & 1977-043-00 Re SG Level Indication and PCS Flow Detection
05000255/LER-2078-025, & LER 1978-025-00 for Palisades Nuclear Plant, Steam Generator Ph Dropped to 8.02 & One of Two Heaters for T-53B (Concentrated Boric Acid Tank) Failed
05000255/LER-1980-012, Licensee Event Report 80-012 Regarding Bottom Half of the Barrier for Fire Penetration HO-12 Was Missing During Inspection of Fire Barriers
05000255/LER-1980-002-03, /03L-0:on 791023,during Routine Testing of Hydraulic Snubbers,Snubber S-6,located on Main Steam Line, Failed to Meet Test Acceptance Criteria.Caused by Loose Accumulator Oil Fill Fitting.Snubber Replaced
05000255/LER-1979-044-03, /03L-0:on 790729,after Shutdown Cooling Sys Leak Test,Valves 3363 Es & 3364 Es Left in Closed Position So That Sodium Hydroxide Addition Sys Was Not Returned to Svc. Caused by Inadequate Surveillance Procedure
05000255/LER-1979-027-03, /03L-0 on 790614:during Normal Power Operation, Conductivity of B Steam Generator Increased to 7.65 Micro/Mhos Per Cm Beyond Tech Spec Limit.Caused by Condenser in Leakage
05000255/LER-1979-023-03, /03L-0 on 790518:leak in Regenerative Heat Exchanger (E-56) Shell Side Vent Line Resulted in Degradation of Chemical & Vol Control Sys.Caused by High Porosity in Weld.Weld Ground Out & Repaired
05000255/LER-1979-018-03, /03L-0 on 790409:reactor Made Critical W/O Conducting Flow Test of Lines.Caused by Misinterpretation of Tech Specs.Personnel Instructed to Exercise Care When Reviewing Operability Requirements
05000255/LER-1979-012-03, /03L-0 on 790201:during Normal Plant Operation, Primary Coolant Pump Inadvertantly Stopped.Reactor Immediately Tripped.Shutdown Margin Was Less than Specified in Tech Specs.Power Conversion Sys Was Emergency Borated
05000255/LER-1979-033-03, /03L-0 on 790730:I-beam to Which Snubber Is Anchored Was Twisted Approx 20 Degrees at Spot Where Snubber Bracket Connected.Cause Undetermined.Defective I-beam Segment Replaced & Snubber Fully Compressed
05000255/LER-1979-024-03, /03L-0 on 790608:level in Safety Injection Tank Fell Below Tech Spec Limit.Caused by Annunciation of Independent Level Switch.Switch Adjusted
05000255/LER-1979-008-03, /03L-0 on 790126: Tank Vent Valve (CV-3051) Opened Simultaneously w/N2 Fill Valve;Tank Pressure Dropped Below Tech Specs Limit. Caused by Electrical Short Between Wires for Fill & Vent Valves
05000255/LER-1979-028-03, /03L-0 on 790623:conductivity & Sodium Concentration in Steam Generator a Exceeded Tech Spec Limits.Caused by Combination of Condenser Tube in Leakage & Chemical Hideout Return as Result of Power Reduction
05000251/LER-1981-004-03, /03L-0:on 810322,reactor Trip Resulted from Steam Flow/Feedwater Flow Mismatch Coincident W/Steam Generator a Low Level.Caused by Failed Solenoid Coil on Feedwater Regulator Valve.Evaluation Continuing
05000250/LER-1981-008-03, /03L-0:on 810416,crack Found in Weld on Drain Line from Charging Sys Downstream of Regenerative Heat Exchanger. Probably Caused by Stress Due to Line Vibration.Defective Area Cut Out,Nipple Shortened & Weld Replaced
05000250/LER-1980-024-03, /03L-0:on 801119,flow/feedwater Flow Mismatch W/ Low Steam Generator Water Level in Steam Generator a Caused Reactor Trip.Caused by Broken Valve Stem FCV-3-478 Due to Improper Load Distribution.Stems Replaced
05000250/LER-1980-003-03, /03L-0:on 800212,during Power Escalation Following Refueling,Reactor Power Indicated by Power Range Nuclear Instrumentation Was Low.Caused by Bypass Valve on Feedwater Transmitter 3B Not Fully Closed & Nis Improperly Adjuste
05000250/LER-1980-022-03, /03L-0:on 801103,control Rod M-8 (in Control Bank D) Dropped During Power Operation.Cause Unknown.Rod Retrieved & Unit Returned to Full Power Per Approved Procedures
05000250/LER-1979-002, Update to LER 79-002/03X-1 on 790226:during Refueling Shutdown,Crack Found in Weld on Drain Line in B Accumulator Discharge Piping.Caused by Stress Due to Line Vibration. Elbows & Welds Replaced
05000251/LER-1978-016-03, /03L-0 on 781219:process Radiation Monitors R-11 & R-12 Were Out of Svc for About 18-h.Air Sampling Blower Which Monitors R-11 & R-12 Failed Due to Normal Wear
L-81-171, Responds to NRC Re Violations Noted in IE Insp Repts 50-250/81-05 & 50-251/81-05.Corrective Actions:Revised Emergency Diesel Generator Room Diagrams & Prepared 30-day Rept for Tech Spec Reporting Requirement
05000155/LER-1980-005-03, /03L-0:on 800301,following Several Intermittent Automatic Test Circuit Alarms,Sensor Channel D of Reactor Depressurizing Sys Removed from Svc.Caused by Setpoint Drift on Transmitter LT-3183.Transmitter Vented & Returned to S
05000213/LER-1981-003-03, /03L-0:on 810403,pressurizer Power Operated Relief valve,PR-SOV-570 & Associated Block valve,PR-MOV-569,opened Spuriously,Resulting in Momentary RCS Pressure Decrease. Caused by Connector Loosened from Pressure Controller
05000255/LER-2078-022, Re Four Incore Alarms Following Reactor Start-up
05000255/LER-1981-015-03, /03L-0:on 810414,routine Chemistry Sampling of Safety Injection Tanks Revealed Boron Concentration of SIT T-82B to Be 1671 Ppm.Cause of Low Boron Concentration Due to Dilution Resulting from PCS Leakage
05000305/LER-1983-037-03, /03L-0:on 831213,during Full Power,Svc Water Pump 1A2 Taken Out of Svc.Caused by Packing Leak on Svc Water Strainer.Strainer Repacked & Pump Tested
05000255/LER-1983-078-03, /03L-0:on 830915,QA Audit Revealed That Tech Spec Surveillance Procedure FO-1 Not Performed within Required Frequency.Caused by Personnel error.FO-1 Will Be Completed Prior to Plant Startup
05000250/LER-1983-008-03, /03L-0:on 830614,conduit for Future Safety Parameter Display Sys Accidentally Damaged During Installation.One Containment Spray Pump Involved.Caused by Incorrect Drawing.Repairs Initiated
05000255/LER-1983-046-03, /03L-0:on 830626,routine Sample of Sodium Hydroxide Tank T-103 Determined Concentration Below Tech Spec Limit.Cause Unknown.Possibility of Chemical Reaction within Tank Being Investigated
05000255/LER-1983-032-03, /03L-0:on 830429,declaration of Operability Signature Found Incomplete for Maint Order on Fire Barrier Penetration.Caused by Personnel Oversight Re New Maint Order Closeout Procedures
05000206/LER-1982-014-03, /03L-0:on 820429,four Snubbers Identified as Having Empty Reservoirs.Upon Further Testing,One Snubber Failed to Pass Stroke Test.Caused by Excessive Hydraulic Fluid Leakage.Snubbers Rebuilt
05000305/LER-1983-036-03, /03L-0:on 831213,shield Bldg Ventilation Fan 1A Failed to Start During Monthly Surveillance Test.Caused by Procedural Error.Charcoal Filter Heat Detector Test Procedure Revised