| | | Reporting criterion |
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| 05000298/LER-1979-001, Forwards LER 79-001/03L-0 | Forwards LER 79-001/03L-0 | |
| 05000298/LER-1979-001-03, /03L-0 on 790103:during Operation,Drywell Atmospheric Radiation Monitor Gas Channel (RMV-RM-4C) Failed Downscale.Caused by Detector Failure Caused by Moisture in Detector Chamber.Detector Replaced;Chamber & Lines Dried | /03L-0 on 790103:during Operation,Drywell Atmospheric Radiation Monitor Gas Channel (RMV-RM-4C) Failed Downscale.Caused by Detector Failure Caused by Moisture in Detector Chamber.Detector Replaced;Chamber & Lines Dried | |
| 05000298/LER-1979-005-03, /03X-1 on 790216:reactor Recirculation Motor Generator Set a Tripped During Normal Operation.Caused by Failure of Level Switch NBI-LIS-58A Due to Corrosion. Corrosion Cleaned from Inside Switch Case & Switch Replaced | /03X-1 on 790216:reactor Recirculation Motor Generator Set a Tripped During Normal Operation.Caused by Failure of Level Switch NBI-LIS-58A Due to Corrosion. Corrosion Cleaned from Inside Switch Case & Switch Replaced | |
| 05000298/LER-1979-005, Forwards LER 79-005/03X-1 | Forwards LER 79-005/03X-1 | |
| 05000298/LER-1979-008-03, /03L-0 on 790420:breaker 1FA Failed to Trip When Control Switch Operated to Trip.Caused by Failure of Auxiliary Switch Contact Mounted Inside Breaker 1FA to Make Proper Electrical Contact.Breaker Inspected & Cleaned | /03L-0 on 790420:breaker 1FA Failed to Trip When Control Switch Operated to Trip.Caused by Failure of Auxiliary Switch Contact Mounted Inside Breaker 1FA to Make Proper Electrical Contact.Breaker Inspected & Cleaned | |
| 05000298/LER-1979-008, Forwards LER 79-008/03L-0 | Forwards LER 79-008/03L-0 | |
| 05000298/LER-1979-009-03, /03L-0 on 790430:four Penetrations Found Leaking Excessively During Local Leak Rate Test.Caused by Defects in Limitorque Operator Torque Switch,Seal Rings & Check Valves. All Defects Repaired | /03L-0 on 790430:four Penetrations Found Leaking Excessively During Local Leak Rate Test.Caused by Defects in Limitorque Operator Torque Switch,Seal Rings & Check Valves. All Defects Repaired | |
| 05000298/LER-1979-009, Forwards LER 79-009/03L-0 | Forwards LER 79-009/03L-0 | |
| 05000298/LER-1979-010, Forwards LER 79-010/03L-0 | Forwards LER 79-010/03L-0 | |
| 05000298/LER-1979-010-03, /03L-0 on 790424:surface Linear Indication Found in Weld RA5-CF-13,main Steam to a & B RHR Heat Exchangers & HPCI Turbine.Caused by Welding Error.Defect Removed | /03L-0 on 790424:surface Linear Indication Found in Weld RA5-CF-13,main Steam to a & B RHR Heat Exchangers & HPCI Turbine.Caused by Welding Error.Defect Removed | |
| 05000298/LER-1979-011, Forwards LER 79-011/03L-0 | Forwards LER 79-011/03L-0 | |
| 05000298/LER-1979-011-03, /03L-0 on 790424:reactor Water Cleanup MO-18 Contactor Failed to Close Manually During Cold Shutdown. Caused by Failure of Auxiliary Contact Mechanism.Repairs Completed Per IE Bulletin 78-05 | /03L-0 on 790424:reactor Water Cleanup MO-18 Contactor Failed to Close Manually During Cold Shutdown. Caused by Failure of Auxiliary Contact Mechanism.Repairs Completed Per IE Bulletin 78-05 | |
| 05000298/LER-1979-012-03, /03L-0 on 790503:vessel Water Temp Increased to 220 F W/Primary Containment Integrity Not Established.Caused by Omission in Operating Procedures.Setpoint of Interlock Verified & Procedures Revised | /03L-0 on 790503:vessel Water Temp Increased to 220 F W/Primary Containment Integrity Not Established.Caused by Omission in Operating Procedures.Setpoint of Interlock Verified & Procedures Revised | |
| 05000298/LER-1979-012, Forwards LER 79-012/03L-0 | Forwards LER 79-012/03L-0 | |
| 05000298/LER-1979-013-03, /03L-0 on 790508:correct Drywell to Suppression Chamber Reading Not Established.Caused by Leaking Inlet Purge Valve.Valve Repaired & Leak Tested | /03L-0 on 790508:correct Drywell to Suppression Chamber Reading Not Established.Caused by Leaking Inlet Purge Valve.Valve Repaired & Leak Tested | |
| 05000298/LER-1979-013, Forwards LER 79-013/03L-0 | Forwards LER 79-013/03L-0 | |
| 05000298/LER-1979-014, Forwards LER 79-014/03L-0 | Forwards LER 79-014/03L-0 | |
| 05000298/LER-1979-014-03, /03L-0 on 790509:chamber Vent Valve for Torus Level Transmitter Was Left Closed.Caused by Technician Error.Vent Valve Opened & PC-LT-12 Placed Back Into Svc | /03L-0 on 790509:chamber Vent Valve for Torus Level Transmitter Was Left Closed.Caused by Technician Error.Vent Valve Opened & PC-LT-12 Placed Back Into Svc | |
| 05000298/LER-1979-015-03, /03X-1 on 790525:breaker 1AS Failed to Close Automatically After Reactor Scrammed.Caused by Improper Operations of Switch 52 in Breaker 1AN.Breaker 1FA Failed to Trip.Caused by Misaligned Trip Coil & Armature | /03X-1 on 790525:breaker 1AS Failed to Close Automatically After Reactor Scrammed.Caused by Improper Operations of Switch 52 in Breaker 1AN.Breaker 1FA Failed to Trip.Caused by Misaligned Trip Coil & Armature | |
| 05000298/LER-1979-015, Forwards LER 79-015/03X-1 | Forwards LER 79-015/03X-1 | |
| 05000298/LER-1979-016-03, /03L-0 on 790531:RHR Pump 1A Tripped During Start on Overcurrent in Phase C.Caused by Failure of GE Model 121AC66K8A Overcurrent Relay Operating Disc to Return to Normal Position.Relay Cleaned,Recalibr & Retested | /03L-0 on 790531:RHR Pump 1A Tripped During Start on Overcurrent in Phase C.Caused by Failure of GE Model 121AC66K8A Overcurrent Relay Operating Disc to Return to Normal Position.Relay Cleaned,Recalibr & Retested | |
| 05000298/LER-1979-016, Forwards LER 79-016/03L-0 | Forwards LER 79-016/03L-0 | |
| 05000298/LER-1979-017, Forwards LER 79-017/03L-0 | Forwards LER 79-017/03L-0 | |
| 05000298/LER-1979-017-03, /03L-0 on 790620:during Review,Observed That Surveillance Procedure 6.2.4.1 Did Not Include Daily Check of Undervoltage Relays or Monthly Functional Testing. Cause Unstated.Procedures Revised | /03L-0 on 790620:during Review,Observed That Surveillance Procedure 6.2.4.1 Did Not Include Daily Check of Undervoltage Relays or Monthly Functional Testing. Cause Unstated.Procedures Revised | |
| 05000298/LER-1979-018-03, /03L-0 on 790706:during Routine Testing,Reactor Vessel Level Indicating Switch NBI-LIS-58A Was Found W/Trip Point Less than Allowed.Caused by Sediments of Dust & Moisture in Auxiliary Switch | /03L-0 on 790706:during Routine Testing,Reactor Vessel Level Indicating Switch NBI-LIS-58A Was Found W/Trip Point Less than Allowed.Caused by Sediments of Dust & Moisture in Auxiliary Switch | |
| 05000298/LER-1979-018, Forwards LER 79-018/03L-0 | Forwards LER 79-018/03L-0 | |
| 05000298/LER-1979-019-01, /01T-0:on 790809,upon Auto Start Signal,High Pressure Coolant Injection Pump Did Not Initially Start. Caused by Deterioration of Piston Rings in Valve Actuator. Rings Replaced & Test Completed Satisfactorily | /01T-0:on 790809,upon Auto Start Signal,High Pressure Coolant Injection Pump Did Not Initially Start. Caused by Deterioration of Piston Rings in Valve Actuator. Rings Replaced & Test Completed Satisfactorily | |
| 05000298/LER-1979-019, Forwards LER 79-019/01T-0 | Forwards LER 79-019/01T-0 | |
| 05000298/LER-1979-020-03, /03L-0:on 790809,while Performing Surveillance Procedure on Relief Valve Bellows Monitoring Sys,Pressure Switch MS-PS-71G Failed to Actuate.Caused by Improper Assembly.Switch Was Replaced | /03L-0:on 790809,while Performing Surveillance Procedure on Relief Valve Bellows Monitoring Sys,Pressure Switch MS-PS-71G Failed to Actuate.Caused by Improper Assembly.Switch Was Replaced | |
| 05000298/LER-1979-020, Forwards LER 79-020/03L-0 | Forwards LER 79-020/03L-0 | |
| 05000298/LER-1979-021-03, /03L-0:on 790811,carbon Absorber in Standby Gas Treatment Sys B Was Wetted W/Water When Control Room Received Actuation Alarm for Deluge Sys.Caused by Improper Installation of Baseplate of Fire Detection Unit | /03L-0:on 790811,carbon Absorber in Standby Gas Treatment Sys B Was Wetted W/Water When Control Room Received Actuation Alarm for Deluge Sys.Caused by Improper Installation of Baseplate of Fire Detection Unit | |
| 05000298/LER-1979-021, Forwards LER 79-021/03L-0 | Forwards LER 79-021/03L-0 | |
| 05000298/LER-1979-022-03, /03L-0:on 790812,water from Carbon Absorber Housing of Standby Gas Treatment Sys a Sprayed Carbon Absorber Trays,Rendering Trays Inoperable.Caused by Inadequate Seating Area Between Valve Clapper & Latch | /03L-0:on 790812,water from Carbon Absorber Housing of Standby Gas Treatment Sys a Sprayed Carbon Absorber Trays,Rendering Trays Inoperable.Caused by Inadequate Seating Area Between Valve Clapper & Latch | |
| 05000298/LER-1979-022, Forwards LER 79-022/03L-0 | Forwards LER 79-022/03L-0 | |
| 05000298/LER-1979-023, Forwards LER 79-023/03L-0 | Forwards LER 79-023/03L-0 | |
| 05000298/LER-1979-023-03, /03L-0:on 790809,Barton Model 288 Differential Pressure Indicating Switch MS-DPIS-119B Was Found in Excess of Tech Specs Table 3.2.A.Caused by Faulty Switch. Microswitch Assembly Was Replaced | /03L-0:on 790809,Barton Model 288 Differential Pressure Indicating Switch MS-DPIS-119B Was Found in Excess of Tech Specs Table 3.2.A.Caused by Faulty Switch. Microswitch Assembly Was Replaced | |
| 05000298/LER-1979-024, Forwards LER 79-024/03L-0 | Forwards LER 79-024/03L-0 | |
| 05000298/LER-1979-024-03, /03L-0:on 790831,surveillance Testing Pressure Switch NBI-PS-55D Found W/Trip Point Below Tech Specs.Cause Not Stated.Switch Readjusted to Proper Setpoint & Then Replaced After Unsatisfactory Performance | /03L-0:on 790831,surveillance Testing Pressure Switch NBI-PS-55D Found W/Trip Point Below Tech Specs.Cause Not Stated.Switch Readjusted to Proper Setpoint & Then Replaced After Unsatisfactory Performance | |
| 05000298/LER-1979-025, Forwards LER 79-025/03L-0 | Forwards LER 79-025/03L-0 | |
| 05000298/LER-1979-025-03, /03L-0:on 790912,HPCI Turbine Stop Valve Separated from Actuator at Split Coupling.Caused by Improperly Mfg Split Coupling.Split Coupling Replaced & Installation Procedures Revised | /03L-0:on 790912,HPCI Turbine Stop Valve Separated from Actuator at Split Coupling.Caused by Improperly Mfg Split Coupling.Split Coupling Replaced & Installation Procedures Revised | |
| 05000298/LER-1979-026, Forwards LER 79-026/03L-0 | Forwards LER 79-026/03L-0 | |
| 05000298/LER-1979-026-03, /03L-0:on 790912,investigation Found Unidentified Drywell Leak on Reactor Recirculation Pump B.Caused by Failure of Pump Seal at Natural End of Life.Seal Replaced.No Further Action Planned | /03L-0:on 790912,investigation Found Unidentified Drywell Leak on Reactor Recirculation Pump B.Caused by Failure of Pump Seal at Natural End of Life.Seal Replaced.No Further Action Planned | |
| 05000298/LER-1979-027, Forwards LER 79-027/03L-0 | Forwards LER 79-027/03L-0 | |
| 05000298/LER-1979-027-03, /03L-0:on 791001,during Routine Surveillance Procedure MS-DPIS-119B,switch Was Found W/Setpoints in Excess of Tech Specs.Caused by Setpoint Drift.Instrument Recalibr | /03L-0:on 791001,during Routine Surveillance Procedure MS-DPIS-119B,switch Was Found W/Setpoints in Excess of Tech Specs.Caused by Setpoint Drift.Instrument Recalibr | |
| 05000298/LER-1979-028, Forwards LER 79-028/03L-0 | Forwards LER 79-028/03L-0 | |
| 05000298/LER-1979-028-03, /03L-0:on 791008,during Insp of Cable Spreading Room,One 4-inch Pipe Sleeve Not Sealed.Caused by Inadequate Control of Fire Seals Installation During Microwave Communications Sys Installation.Sleeve Was Sealed | /03L-0:on 791008,during Insp of Cable Spreading Room,One 4-inch Pipe Sleeve Not Sealed.Caused by Inadequate Control of Fire Seals Installation During Microwave Communications Sys Installation.Sleeve Was Sealed | |
| 05000298/LER-1979-029-03, /03L-0:on 791012,during Routine Plant Tour,Pinhole Leak Detected in Upstream Weld of Supply Isolation Valve. Cause Unknown.Weld Will Be Repaired During Next Shutdown | /03L-0:on 791012,during Routine Plant Tour,Pinhole Leak Detected in Upstream Weld of Supply Isolation Valve. Cause Unknown.Weld Will Be Repaired During Next Shutdown | |
| 05000298/LER-1979-029, Forwards LER 79-029/03L-0 | Forwards LER 79-029/03L-0 | |
| 05000298/LER-1979-030-03, /03L-0:on 791021,while Pumping Water from Torus to radwaste,drywell-to-torus Differential Pressure Dropped Below Tech Specs.Caused by Nitrogen Pressure Forcing Water from Downcomers to Flow to Torus | /03L-0:on 791021,while Pumping Water from Torus to radwaste,drywell-to-torus Differential Pressure Dropped Below Tech Specs.Caused by Nitrogen Pressure Forcing Water from Downcomers to Flow to Torus | |
| 05000298/LER-1979-030, Forwards LER 79-030/03L-0 | Forwards LER 79-030/03L-0 | |
