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| 05000334/LER-1979-001-04, /04T-0 on 790104:chlorination Performed in River Water Sys & Condenser Section.High Alarm on Chlorine Analyzer Received Twice;Chlorine Reached Max of 2.0 Ppm. Caused by Reversed Flow Through Condenser | /04T-0 on 790104:chlorination Performed in River Water Sys & Condenser Section.High Alarm on Chlorine Analyzer Received Twice;Chlorine Reached Max of 2.0 Ppm. Caused by Reversed Flow Through Condenser | |
| 05000334/LER-1979-001, LER 79-1/04P on 790105:during Plant Shutdown,All 4 Cooling Tower Pumps Were Secured,Reversing Flow Thru Main Condenser, Resulting in Direct Backwash of Chlorine Additions Into the River.Addl Info & Corrective Action to Follow | LER 79-1/04P on 790105:during Plant Shutdown,All 4 Cooling Tower Pumps Were Secured,Reversing Flow Thru Main Condenser, Resulting in Direct Backwash of Chlorine Additions Into the River.Addl Info & Corrective Action to Follow | |
| 05000334/LER-1979-002-03, /03L-0 on 790103:reactor Trip & Safety Injection Occurred.During recovery,1C Charging Pump Had Low Discharge Pressure Due to Faulty Rotating Element in Pump | /03L-0 on 790103:reactor Trip & Safety Injection Occurred.During recovery,1C Charging Pump Had Low Discharge Pressure Due to Faulty Rotating Element in Pump | |
| 05000334/LER-1979-002, Forwards LER 79-002/03L-0 & 79-003/03L-0 | Forwards LER 79-002/03L-0 & 79-003/03L-0 | |
| 05000334/LER-1979-003-03, /03L-0 on 790102:increasing Containment Air Partial Pressure observed.1B Containment Vacuum Pump Motor Running,But Pump Not Turning Due to Seized Rotor on Pump | /03L-0 on 790102:increasing Containment Air Partial Pressure observed.1B Containment Vacuum Pump Motor Running,But Pump Not Turning Due to Seized Rotor on Pump | |
| 05000334/LER-1979-005-99, /99X-0 on 790118:during Load Reduction,Condenser Steam Dump Control Valves Opened,Resulting in High Steam Flow Condition Causing Reactor Trip & Safety Injection. Caused by Valve Operator Exposure to Cold Temp | /99X-0 on 790118:during Load Reduction,Condenser Steam Dump Control Valves Opened,Resulting in High Steam Flow Condition Causing Reactor Trip & Safety Injection. Caused by Valve Operator Exposure to Cold Temp | |
| 05000334/LER-1979-005, Forwards LER 79-005/99X-0 | Forwards LER 79-005/99X-0 | |
| 05000334/LER-1979-006-03, /03L-0 on 790120:vital Bus Inverter 3 Failed Resulting in Loss of Voltage on Bus.Caused Reactor to Trip on False Indication of 1C Reactor Coolant Pump Breaker Opening.Failure Caused by Faulty Components in Inverter | /03L-0 on 790120:vital Bus Inverter 3 Failed Resulting in Loss of Voltage on Bus.Caused Reactor to Trip on False Indication of 1C Reactor Coolant Pump Breaker Opening.Failure Caused by Faulty Components in Inverter | |
| 05000334/LER-1979-006, Forwards LER 79-006/03L-0 | Forwards LER 79-006/03L-0 | |
| 05000334/LER-1979-007-01, /01T-0 on 790305:steam Driver Auxiliary Feedwater Pump Declared Inoperable Because 1B Steam Supply Trip Valve Would Not Close.Caused by Missing Nut & Washer on 1C Steam Generator Supply Check Valve.Nut & Washer Replaced | /01T-0 on 790305:steam Driver Auxiliary Feedwater Pump Declared Inoperable Because 1B Steam Supply Trip Valve Would Not Close.Caused by Missing Nut & Washer on 1C Steam Generator Supply Check Valve.Nut & Washer Replaced | |
| 05000334/LER-1979-007, Forwards LER 79-007/01T-0 | Forwards LER 79-007/01T-0 | |
| 05000334/LER-1979-008-01, /01T-1 on 790329:notifies of Potential Inconsistency of Single Dropped Control Rod.Caused by Incorrect Measurement of Core Average Power Level by Rod Controller During Rod Drop Events | /01T-1 on 790329:notifies of Potential Inconsistency of Single Dropped Control Rod.Caused by Incorrect Measurement of Core Average Power Level by Rod Controller During Rod Drop Events | |
| 05000334/LER-1979-009-03, /03L-0 on 790320:during Surveillance Test,Diesel Generator 1 Output Breaker Failed to Close Upon Actuation of Control Switch.Cause of Inoperable Breaker Unknown.Operators Reinstructed in Test Circuit & Surveillance Increased | /03L-0 on 790320:during Surveillance Test,Diesel Generator 1 Output Breaker Failed to Close Upon Actuation of Control Switch.Cause of Inoperable Breaker Unknown.Operators Reinstructed in Test Circuit & Surveillance Increased | |
| 05000334/LER-1979-010-01, /01T-1 on 790416:notifies of Potential for Failure of Inside Recirculation Spray Pump Motors.Caused by Reduction of Internal Clearance Due to Heat Gradient as Motor Comes Up to Operating Temp.Mods Made to Clearance | /01T-1 on 790416:notifies of Potential for Failure of Inside Recirculation Spray Pump Motors.Caused by Reduction of Internal Clearance Due to Heat Gradient as Motor Comes Up to Operating Temp.Mods Made to Clearance | |
| 05000334/LER-1979-013-03, /03L-0 on 790522:during Surveillance of Control Room Habitability Sys,Pressure Regulators for Control Room Pressurization Were Found Cycling.Caused by Improper Calibr. Controls Tuned & Procedure Revised | /03L-0 on 790522:during Surveillance of Control Room Habitability Sys,Pressure Regulators for Control Room Pressurization Were Found Cycling.Caused by Improper Calibr. Controls Tuned & Procedure Revised | |
| 05000334/LER-1979-014-01, /01T-1 on 790618:during Special Radiographic Insp of Feedwater Inlet Piping Welds,Cracking Was Discovered in Inlet Elbows.Caused by Fatigue Failure Along W/Corrosion. Insp Completed & Welds Repaired | /01T-1 on 790618:during Special Radiographic Insp of Feedwater Inlet Piping Welds,Cracking Was Discovered in Inlet Elbows.Caused by Fatigue Failure Along W/Corrosion. Insp Completed & Welds Repaired | |
| 05000334/LER-1979-014, Submits Supplemental Info to LER 79-014/01T-0 Re Identification of Cracks in Feedwater Line Elbows.Response Fulfills Requirements of IE Bulletin 79-13.Tables Attached | Submits Supplemental Info to LER 79-014/01T-0 Re Identification of Cracks in Feedwater Line Elbows.Response Fulfills Requirements of IE Bulletin 79-13.Tables Attached | |
| 05000334/LER-1979-015-01, /01T-0 on 790621:received Vendor Notification That High Energy Break Inside Containment Could Cause Potential Steam Generator Level Bias Leading to Delayed Protection Signals.Caused by Calculation Error | /01T-0 on 790621:received Vendor Notification That High Energy Break Inside Containment Could Cause Potential Steam Generator Level Bias Leading to Delayed Protection Signals.Caused by Calculation Error | |
| 05000334/LER-1979-016, Forwards LER 79-016/03L-1 | Forwards LER 79-016/03L-1 | |
| 05000334/LER-1979-016-03, /03L-1 on 790608:discovered Cables on Pump Header Isolation Valves Incorrectly Routed Through Cable Trays. Caused by Failure of Const Personnel to Install & Verify Cable Routings Per Procedure.Routing Corrected | /03L-1 on 790608:discovered Cables on Pump Header Isolation Valves Incorrectly Routed Through Cable Trays. Caused by Failure of Const Personnel to Install & Verify Cable Routings Per Procedure.Routing Corrected | |
| 05000334/LER-1979-017-03, /03L-0 on 790609:during insp,1B Lhsi Pump Suction Valve from Refueling Water Storage Tank Found Inoperable. Caused by Failure of Motor Operator Torque Switch.Switch Assembly Replaced,Tested & Returned to Svc | /03L-0 on 790609:during insp,1B Lhsi Pump Suction Valve from Refueling Water Storage Tank Found Inoperable. Caused by Failure of Motor Operator Torque Switch.Switch Assembly Replaced,Tested & Returned to Svc | |
| 05000334/LER-1979-018, Forwards LER 79-018/03L-0 | Forwards LER 79-018/03L-0 | |
| 05000334/LER-1979-018-03, /03L-0 on 790703:while Switching Vital Bus 3 to Alternate Source Containment Isolation,Phase B Actuation Occurred.Caused by Hi-Hi Containment Pressure.Revised Procedure for Transferring Vital Bus | /03L-0 on 790703:while Switching Vital Bus 3 to Alternate Source Containment Isolation,Phase B Actuation Occurred.Caused by Hi-Hi Containment Pressure.Revised Procedure for Transferring Vital Bus | |
| 05000334/LER-1979-019, Forwards LER 79-019/01T-0 | Forwards LER 79-019/01T-0 | |
| 05000334/LER-1979-019-01, /01T-0 on 790723:two of Four Vendors of Wire Used in Safety Injection Sys Cannot Document Quality of Wire for post-DBA Containment Environ.Wire Will Be Replaced on Four Valves During Refueling | /01T-0 on 790723:two of Four Vendors of Wire Used in Safety Injection Sys Cannot Document Quality of Wire for post-DBA Containment Environ.Wire Will Be Replaced on Four Valves During Refueling | |
| 05000334/LER-1979-020, Forwards LER 79-020/01T-0 | Forwards LER 79-020/01T-0 | |
| 05000334/LER-1979-020-01, /01T-0 on 790724:during Insp,Inoperable Pipe Hanger Baseplate Observed.Caused by Improper Installation of Concrete Expansion Anchors in Baseplate Due to Lack of Formal Procedures During Initial Installation | /01T-0 on 790724:during Insp,Inoperable Pipe Hanger Baseplate Observed.Caused by Improper Installation of Concrete Expansion Anchors in Baseplate Due to Lack of Formal Procedures During Initial Installation | |
| 05000334/LER-1979-021, Notifies of LER 79-21/01P:during Testing of Emergency Bus Volt Transformers,Readings Indicated Degradation of Insulation Resistance as Compared to Original Acceptance Testing.Transformers Will Be Required | Notifies of LER 79-21/01P:during Testing of Emergency Bus Volt Transformers,Readings Indicated Degradation of Insulation Resistance as Compared to Original Acceptance Testing.Transformers Will Be Required | |
| 05000334/LER-1979-021-01, /01T on 790726:meggar Readings Indicated Degradation of Insulation Resistance During Testing of Emergency Bus GE Transformers.Cause Not Stated. Transformers Replaced W/Qualified Ite Transformers | /01T on 790726:meggar Readings Indicated Degradation of Insulation Resistance During Testing of Emergency Bus GE Transformers.Cause Not Stated. Transformers Replaced W/Qualified Ite Transformers | |
| 05000334/LER-1979-022, Forwards LER 79-022/03L-0 | Forwards LER 79-022/03L-0 | |
| 05000334/LER-1979-022-03, /03L-0 on 790722:three of Four Wires Loose & Pulled Out of Main Power Connector on Containment Hydrogen Recombiner 1A While Disassembling for Insp.Caused by Insufficient Set Screw Torque on Wires in Pins of Connector | /03L-0 on 790722:three of Four Wires Loose & Pulled Out of Main Power Connector on Containment Hydrogen Recombiner 1A While Disassembling for Insp.Caused by Insufficient Set Screw Torque on Wires in Pins of Connector | |
| 05000334/LER-1979-023-03, Diesel Generator Output Breaker 1 Failed to Close When Control Switch Actuated & Alarm Indicated Air Start Motor 1 Failure to Start Generator.Caused by Sticking Pinion.Pinion Assembly Cleaned | Diesel Generator Output Breaker 1 Failed to Close When Control Switch Actuated & Alarm Indicated Air Start Motor 1 Failure to Start Generator.Caused by Sticking Pinion.Pinion Assembly Cleaned | |
| 05000334/LER-1979-023, Forwards Updated LER 79-023/03X-1 | Forwards Updated LER 79-023/03X-1 | |
| 05000334/LER-1979-024-01, /01T-0 on 790727:as Result of Review of Asco Solenoid Valves Per IE Bulletin 79-01A,44 Valves Found W/Deficiencies in Environ Qualifications.Caused by Inadequate Design | /01T-0 on 790727:as Result of Review of Asco Solenoid Valves Per IE Bulletin 79-01A,44 Valves Found W/Deficiencies in Environ Qualifications.Caused by Inadequate Design | |
| 05000334/LER-1979-025-03, /03L-0 on 790624:during Records Review,Biasing Circuit for Channel 2 Temp Change Signal Summator Produced Output Signal Setpoint Approx 25 Degrees Too Low. Caused by Failure of Instrument Loop Signal Summator | /03L-0 on 790624:during Records Review,Biasing Circuit for Channel 2 Temp Change Signal Summator Produced Output Signal Setpoint Approx 25 Degrees Too Low. Caused by Failure of Instrument Loop Signal Summator | |
| 05000334/LER-1979-026, Forwards LER 79-026/03L-0 | Forwards LER 79-026/03L-0 | |
| 05000334/LER-1979-026-03, /03L-0:on 790827,channel 3 Overpower Delta Temp Alarm Was Received.Caused by Miscalibr of Instrument Loop as Result of Not Having Current Resistance Temp Detector Calibr Data in Surveillance Test.Maint Procedures Will Be Rev | /03L-0:on 790827,channel 3 Overpower Delta Temp Alarm Was Received.Caused by Miscalibr of Instrument Loop as Result of Not Having Current Resistance Temp Detector Calibr Data in Surveillance Test.Maint Procedures Will Be Revised | |
| 05000334/LER-1979-028, Discusses LER 79-028/01P-0 on 790820:reactor Was Manually Tripped Following Trip of Main Feed Pump 1B Due to Low Net Positive Suction Head.Manual Trip Caused 1A & 1B 4kV Buses to Trip on All Reactor Coolant Pumps on Underfreque | Discusses LER 79-028/01P-0 on 790820:reactor Was Manually Tripped Following Trip of Main Feed Pump 1B Due to Low Net Positive Suction Head.Manual Trip Caused 1A & 1B 4kV Buses to Trip on All Reactor Coolant Pumps on Underfrequency | |
| 05000334/LER-1979-028-01, /01T-0:on 790819,while Performing Manual Actions Following Reactor Trip,Operator Tripped Generator Output Breakers,Resulting in Underfrequency.Caused by Operator Error.Operator Reprimanded | /01T-0:on 790819,while Performing Manual Actions Following Reactor Trip,Operator Tripped Generator Output Breakers,Resulting in Underfrequency.Caused by Operator Error.Operator Reprimanded | |
| 05000334/LER-1979-029, Forwards Updated LER 79-029/03L-0 | Forwards Updated LER 79-029/03L-0 | |
| 05000334/LER-1979-029-03, Speed Increaser Bearings & Lube Oil Pump Overheated.Caused by Failure of Personnel to Insure Satisfactory Return to Svc of Charging Pump Following Maint.Replaced Bearing & Lube Oil Pump | Speed Increaser Bearings & Lube Oil Pump Overheated.Caused by Failure of Personnel to Insure Satisfactory Return to Svc of Charging Pump Following Maint.Replaced Bearing & Lube Oil Pump | |
| 05000334/LER-1979-030-03, /03L-0:on 790823,containment Air Lock Surveillance Test Not Performed as Required.Caused by Failure of Operations Personnel to Perform Surveillance Test.Operating Supervisors Instructed to Be More Aware | /03L-0:on 790823,containment Air Lock Surveillance Test Not Performed as Required.Caused by Failure of Operations Personnel to Perform Surveillance Test.Operating Supervisors Instructed to Be More Aware | |
| 05000334/LER-1979-031-03, /03L-0:on 790807,during Testing of Emergency Diesel Generator Sequencing Circuit,First Loading Sequence Was Shorter than Required.Caused by Starting Point Being Off Zero.Sequencer Cycled & Adjusted to within Spec Limits | /03L-0:on 790807,during Testing of Emergency Diesel Generator Sequencing Circuit,First Loading Sequence Was Shorter than Required.Caused by Starting Point Being Off Zero.Sequencer Cycled & Adjusted to within Spec Limits | |
| 05000334/LER-1979-031, Forwards LER 79-031/03L-0 | Forwards LER 79-031/03L-0 | |
| 05000334/LER-1979-032-03, /03L-0:on 790809,prior to Energizing 480-volt Stub Bus from Newly Installed Transformer,One Load Breaker Did Not Trip on Bus Undervoltage.Caused by Dirty Contacts on Phase Imbalance Relay.Contacts Cleaned & Tested | /03L-0:on 790809,prior to Energizing 480-volt Stub Bus from Newly Installed Transformer,One Load Breaker Did Not Trip on Bus Undervoltage.Caused by Dirty Contacts on Phase Imbalance Relay.Contacts Cleaned & Tested | |
| 05000334/LER-1979-032, Forwards LER 79-032/03L-0 | Forwards LER 79-032/03L-0 | |
| 05000334/LER-1979-033-03, /03L-0:on 790824,nuclear Instrumentation Sys Power Range Low Power Trip Logic Inoperable.Caused by Faulty Logic Board for Low Power Trip.Logic Board Replaced & Surveillance Test Completed Satisfactorily | /03L-0:on 790824,nuclear Instrumentation Sys Power Range Low Power Trip Logic Inoperable.Caused by Faulty Logic Board for Low Power Trip.Logic Board Replaced & Surveillance Test Completed Satisfactorily | |
| 05000334/LER-1979-034, Forwards LER 79-034/03L-0 | Forwards LER 79-034/03L-0 | |
| 05000334/LER-1979-034-03, /03L-0:on 790424,loop B Temp Indication Failed Downscale.Caused by Failure of Capacitor in Low Level Amplifier TM-RC-422H for Loop B Hot Leg Temp.Redundant Instrumentation Used Until Capacitor Replaced | /03L-0:on 790424,loop B Temp Indication Failed Downscale.Caused by Failure of Capacitor in Low Level Amplifier TM-RC-422H for Loop B Hot Leg Temp.Redundant Instrumentation Used Until Capacitor Replaced | |
| 05000334/LER-1979-035-03, /03L-0:on 790430,during 18-month Surveillance testing,23 Snubbers Had lock-up or Bleed Rate Values Outside of Acceptance Criteria.Caused by Air in Cylinder,Wear Ring Problems & Handling Damage.Snubbers Rebuilt | /03L-0:on 790430,during 18-month Surveillance testing,23 Snubbers Had lock-up or Bleed Rate Values Outside of Acceptance Criteria.Caused by Air in Cylinder,Wear Ring Problems & Handling Damage.Snubbers Rebuilt | |