| | | Reporting criterion |
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| 05000293/LER-1979-001, Forwards LER 79-001/03L-0 | Forwards LER 79-001/03L-0 | |
| 05000293/LER-1979-001-03, /03L-0 on 790104:fuse in Power Supply for Reactor Bldg Vent Monitor Sample Pump Blew Three Times.Trip Investigated with No Apparent Cause Discovered.Pump Determined to Be Rotating Freely & Fuse Replaced | /03L-0 on 790104:fuse in Power Supply for Reactor Bldg Vent Monitor Sample Pump Blew Three Times.Trip Investigated with No Apparent Cause Discovered.Pump Determined to Be Rotating Freely & Fuse Replaced | |
| 05000293/LER-1979-002, Forwards LER 79-002/03L-0 | Forwards LER 79-002/03L-0 | |
| 05000293/LER-1979-002-03, /03L-0 on 790107:reactor Bldg Vent Monitor Was Removed from Svc to Investigate Low Flow Condition.For About 2-h Personnel Cleaned & Readjusted Dirty Controller.Alarm Sys Is Adequate to Detect Problems of This Nature | /03L-0 on 790107:reactor Bldg Vent Monitor Was Removed from Svc to Investigate Low Flow Condition.For About 2-h Personnel Cleaned & Readjusted Dirty Controller.Alarm Sys Is Adequate to Detect Problems of This Nature | |
| 05000293/LER-1979-003, Forwards LER 79-003/03L-0 | Forwards LER 79-003/03L-0 | |
| 05000293/LER-1979-003-03, /03L-0 on 790114:during Control Rod Exercise Surveillance,Control Rod 30-15 Would Not Respond to Insert Signal.Caused by Slight Indentations on Teflon Discs of All Four Directional Control Valve Moveable Cores | /03L-0 on 790114:during Control Rod Exercise Surveillance,Control Rod 30-15 Would Not Respond to Insert Signal.Caused by Slight Indentations on Teflon Discs of All Four Directional Control Valve Moveable Cores | |
| 05000293/LER-1979-004, Forwards LER 79-004/03L-0 | Forwards LER 79-004/03L-0 | |
| 05000293/LER-1979-004-03, /03L-0 on 790120:plant Stack Process Radiation Monitoring Sys Failed.Caused by Sample Line Freezing | /03L-0 on 790120:plant Stack Process Radiation Monitoring Sys Failed.Caused by Sample Line Freezing | |
| 05000293/LER-1979-005, Forwards LER 79-005/03L-0 | Forwards LER 79-005/03L-0 | |
| 05000293/LER-1979-005-03, /03L-0 on 790131:during Surveillance,Settings of Time Delay Relays Tdu 2E-K5A & 2E-K5B Found to Be Incorrect. Caused by Minor Setpoint Drift.Adjustment Completed.Relay May Be Replaced | /03L-0 on 790131:during Surveillance,Settings of Time Delay Relays Tdu 2E-K5A & 2E-K5B Found to Be Incorrect. Caused by Minor Setpoint Drift.Adjustment Completed.Relay May Be Replaced | |
| 05000293/LER-1979-006, Forwards LER 79-006/03L-0 | Forwards LER 79-006/03L-0 | |
| 05000293/LER-1979-006-03, /03L-0 on 790206:reactor Water Conductivity Increased to 30 umho/cm2 After Placing D Condensate Demineralizer in Svc.Caused by Broken Lower Laterals & Bent Resin Inlet Line & Flange of Post Strainer | /03L-0 on 790206:reactor Water Conductivity Increased to 30 umho/cm2 After Placing D Condensate Demineralizer in Svc.Caused by Broken Lower Laterals & Bent Resin Inlet Line & Flange of Post Strainer | |
| 05000293/LER-1979-007, Forwards LER 79-007/03L-0 | Forwards LER 79-007/03L-0 | |
| 05000293/LER-1979-007-03, /03L-0 on 790212:during Tests,Valves AO-5033A, CV-5065-10,15,16 & 17 Failed to Close within Specified Tolerance.Cause Undetermined,But Was Not Alignment Problem. Surveillance Increased from Quarterly to Monthly | /03L-0 on 790212:during Tests,Valves AO-5033A, CV-5065-10,15,16 & 17 Failed to Close within Specified Tolerance.Cause Undetermined,But Was Not Alignment Problem. Surveillance Increased from Quarterly to Monthly | |
| 05000293/LER-1979-008, Forwards LER 79-008/03L-0 | Forwards LER 79-008/03L-0 | |
| 05000293/LER-1979-008-03, HPCI Turbine Tripped. Caused by Ruptured Lower Head Gasket on Gland Seal Condenser.Repairs Completed & Surveillance Test Successfully Performed | HPCI Turbine Tripped. Caused by Ruptured Lower Head Gasket on Gland Seal Condenser.Repairs Completed & Surveillance Test Successfully Performed | |
| 05000293/LER-1979-009-03, /03L-0 on 790218:fuse Blew in Power Supply for Reactor Bldg Vent Process Radiation Monitor Sample Pump. Sample Pump Had Bound,Overloading Input Power Circuitry. Pumps Replaced | /03L-0 on 790218:fuse Blew in Power Supply for Reactor Bldg Vent Process Radiation Monitor Sample Pump. Sample Pump Had Bound,Overloading Input Power Circuitry. Pumps Replaced | |
| 05000293/LER-1979-009, Forwards LER 79-009/03L-0 | Forwards LER 79-009/03L-0 | |
| 05000293/LER-1979-010-03, /03L-0 on 790304:control Rod Failed to Insert to 90% Insertion Point.Caused by a Sticky Asco Solenoid Valve Associated W/Control Rod Which Showed Venting of Scram Pilot Valves.Both Valves Replaced | /03L-0 on 790304:control Rod Failed to Insert to 90% Insertion Point.Caused by a Sticky Asco Solenoid Valve Associated W/Control Rod Which Showed Venting of Scram Pilot Valves.Both Valves Replaced | |
| 05000293/LER-1979-010, Forwards LER 79-010/03L-0 | Forwards LER 79-010/03L-0 | |
| 05000293/LER-1979-011-03, /03L-0 on 790307:fire Water Shortage Tanks Volume Was Less than 240,000 Gallons in Each Tank.Caused by Failure to Ensure Levels Maintained within Tech Spec Limits. Procedures Revised | /03L-0 on 790307:fire Water Shortage Tanks Volume Was Less than 240,000 Gallons in Each Tank.Caused by Failure to Ensure Levels Maintained within Tech Spec Limits. Procedures Revised | |
| 05000293/LER-1979-011, Forwards LER 79-011/03L-0 | Forwards LER 79-011/03L-0 | |
| 05000293/LER-1979-017, Forwards LER 79-017/03L-0 | Forwards LER 79-017/03L-0 | |
| 05000293/LER-1979-017-03, /03L-0 on 790429:control Rod 26-27 Unresponsive to Insert Signal.Cause Undetermined.Corrective Actions:Relay Contacts & Relay Socket Contacts on Relay 3A-KL32 Spray Cleaned | /03L-0 on 790429:control Rod 26-27 Unresponsive to Insert Signal.Cause Undetermined.Corrective Actions:Relay Contacts & Relay Socket Contacts on Relay 3A-KL32 Spray Cleaned | |
| 05000293/LER-1979-018, Forwards LER 79-018/01T-1 | Forwards LER 79-018/01T-1 | |
| 05000293/LER-1979-018-01, /01T-1: on 790519,recirculation Pump Started W/Delta Temp Between Loops Greater than 50 F & Reactor Coolant Temp Greater than 212 F.Caused by Failure to Follow Station Operating Procedures & Temp Monitors | /01T-1: on 790519,recirculation Pump Started W/Delta Temp Between Loops Greater than 50 F & Reactor Coolant Temp Greater than 212 F.Caused by Failure to Follow Station Operating Procedures & Temp Monitors | |
| 05000293/LER-1979-019-01, /01T-0 on 790705:error Discovered in Calculation Utilized to Support Amend 34 to Fsar.Model Assumed Reactor Bldg Truck Lock Door Open to Atmosphere.Erroneous Computer Runs Corrected & New Analysis Performed | /01T-0 on 790705:error Discovered in Calculation Utilized to Support Amend 34 to Fsar.Model Assumed Reactor Bldg Truck Lock Door Open to Atmosphere.Erroneous Computer Runs Corrected & New Analysis Performed | |
| 05000293/LER-1979-019, Forwards LER 79-019/01T-0 | Forwards LER 79-019/01T-0 | |
| 05000293/LER-1979-020, Forwards LER 79-020/03L-0 | Forwards LER 79-020/03L-0 | |
| 05000293/LER-1979-020-03, /03L-0 on 790610:broken Belts Found on Standby Gas Treatment Sys Exhaust Fan 210A.Caused by Belt Age.Belts Replaced & Sys Returned to Svc | /03L-0 on 790610:broken Belts Found on Standby Gas Treatment Sys Exhaust Fan 210A.Caused by Belt Age.Belts Replaced & Sys Returned to Svc | |
| 05000293/LER-1979-021-01, /01T-0 on 790710:water Dripping from Lagging on Control Rod Driveline.Caused by Pinhole Leak Adjacent to Inboard Weld on 3-inch Inboard Manual Isolation Valve.Unit Shut Down.Valve Replaced W/Pipe | /01T-0 on 790710:water Dripping from Lagging on Control Rod Driveline.Caused by Pinhole Leak Adjacent to Inboard Weld on 3-inch Inboard Manual Isolation Valve.Unit Shut Down.Valve Replaced W/Pipe | |
| 05000293/LER-1979-021, Forwards LER 79-021/01T-0 | Forwards LER 79-021/01T-0 | |
| 05000293/LER-1979-022, Forwards LER 79-022/01T-0 | Forwards LER 79-022/01T-0 | |
| 05000293/LER-1979-022-01, /01T-0 on 790713:during Evaluation of Seismic Restraints,Pipe Supports on HPCI Test Line Downstream of Test Valve & on RHR Crosstie Failed to Meet SSE Specs.Caused by Design Error.Supports Modified | /01T-0 on 790713:during Evaluation of Seismic Restraints,Pipe Supports on HPCI Test Line Downstream of Test Valve & on RHR Crosstie Failed to Meet SSE Specs.Caused by Design Error.Supports Modified | |
| 05000293/LER-1979-023-03, /03L-0 on 790616:during Routine Testing,Noted That Closing Times for A0-203-1A & E Greater than Allowable Limits.Caused by Changes in Characteristics of Hydraulic Operators.Operators Adjusted | /03L-0 on 790616:during Routine Testing,Noted That Closing Times for A0-203-1A & E Greater than Allowable Limits.Caused by Changes in Characteristics of Hydraulic Operators.Operators Adjusted | |
| 05000293/LER-1979-023, Forwards LER 79-023/03L-0 | Forwards LER 79-023/03L-0 | |
| 05000293/LER-1979-024, Forwards LER 79-024/03X-0 | Forwards LER 79-024/03X-0 | |
| 05000293/LER-1979-024-03, /03X-0 on 790619:surveillance Test 8.M.3-11 Re Reactor Protection Sys Instrument Response Time Not Performed Since Nov 1975.Caused by Scheduling Inadequacy. Test Performed Satisfactorily on 790630 | /03X-0 on 790619:surveillance Test 8.M.3-11 Re Reactor Protection Sys Instrument Response Time Not Performed Since Nov 1975.Caused by Scheduling Inadequacy. Test Performed Satisfactorily on 790630 | |
| 05000293/LER-1979-025-01, /01T-0 on 790717:while Completing Valve Lineup for Startup W/Coolant Temp of 212 F,Doors in Drywell Personnel Hatch Left Open.Caused by Incomplete Startup List Instructions.Procedure Revised to Incorporate Instructions | /01T-0 on 790717:while Completing Valve Lineup for Startup W/Coolant Temp of 212 F,Doors in Drywell Personnel Hatch Left Open.Caused by Incomplete Startup List Instructions.Procedure Revised to Incorporate Instructions | |
| 05000293/LER-1979-025, Forwards LER 79-025/01T-0 | Forwards LER 79-025/01T-0 | |
| 05000293/LER-1979-026, Forwards LER 79-026/03L-0 | Forwards LER 79-026/03L-0 | |
| 05000293/LER-1979-026-03, /03L-0 on 790708:while Performing Surveillance Test 8.7.4.4,MSIV Timing,Msiv A-203-ID(inboard) Closed within 2.6-s.Caused by Leaking Nipple in Hydraulic Sys on Valve Operator.Leak Repaired & Hydraulic Sys Refilled | /03L-0 on 790708:while Performing Surveillance Test 8.7.4.4,MSIV Timing,Msiv A-203-ID(inboard) Closed within 2.6-s.Caused by Leaking Nipple in Hydraulic Sys on Valve Operator.Leak Repaired & Hydraulic Sys Refilled | |
| 05000293/LER-1979-027-01, /01T-0 on 790727:reactor Scram Occurred as Result of Loss of All Offsite Power.Caused by Lightning Striking Offsite Distribution Lines.Resulting Backflash Caused High Speed Relay Operation for Line to Ground Fault | /01T-0 on 790727:reactor Scram Occurred as Result of Loss of All Offsite Power.Caused by Lightning Striking Offsite Distribution Lines.Resulting Backflash Caused High Speed Relay Operation for Line to Ground Fault | |
| 05000293/LER-1979-027, Forwards LER 79-027/01T-0 | Forwards LER 79-027/01T-0 | |
| 05000293/LER-1979-028-03, /03L-0 on 790627:during Placement of RHR Loop a in Supression Pool Cooling,Flow Was Observed w/motor-operated Valve 1001-36A Indicating Closed.Cause Not Determined | /03L-0 on 790627:during Placement of RHR Loop a in Supression Pool Cooling,Flow Was Observed w/motor-operated Valve 1001-36A Indicating Closed.Cause Not Determined | |
| 05000293/LER-1979-028, Forwards LER 79-028/03L-0 | Forwards LER 79-028/03L-0 | |
| 05000293/LER-1979-029, Forwards LER 79-029/01T-0 | Forwards LER 79-029/01T-0 | |
| 05000293/LER-1979-029-01, /01T-0:on 790612,while Performing Repairs on Core Spray Sys Min Flow Line A,Degradation of Primary Containment Occurred.Caused by Inadequate Review of Planned Maint Activities.Incident Will Be Reviewed | /01T-0:on 790612,while Performing Repairs on Core Spray Sys Min Flow Line A,Degradation of Primary Containment Occurred.Caused by Inadequate Review of Planned Maint Activities.Incident Will Be Reviewed | |
| 05000293/LER-1979-030, Forwards LER 79-030/03L-0 | Forwards LER 79-030/03L-0 | |
| 05000293/LER-1979-030-03, /03L-0 on 790725:motor Control Ctr Breaker of Globe Valve MOV-1001-36B Tripped on Overload After Valve Given Signal to Open.Caused by Shear in Valve Stem Guide Key.Stem Clamps Drilled in Place & Tapped for Set Screws | /03L-0 on 790725:motor Control Ctr Breaker of Globe Valve MOV-1001-36B Tripped on Overload After Valve Given Signal to Open.Caused by Shear in Valve Stem Guide Key.Stem Clamps Drilled in Place & Tapped for Set Screws | |