| | | Reporting criterion |
|---|
| 05000029/LER-1979-001-03, /03L-0 on 790103:during Normal Operation,Filter Alarm on Containment Main Coolant Sys Leakage Air Particulate Monitor Was Received.Caused by Running Out of Victoreen Type HV-70 Part 841-1-164 Filter Paper | /03L-0 on 790103:during Normal Operation,Filter Alarm on Containment Main Coolant Sys Leakage Air Particulate Monitor Was Received.Caused by Running Out of Victoreen Type HV-70 Part 841-1-164 Filter Paper | |
| 05000029/LER-1979-001, Forwards LER 79-001/03L-0 | Forwards LER 79-001/03L-0 | |
| 05000029/LER-1979-002-03, /03L-0 on 790122:following Plant Trip,Control Room Operator Found Rod 22 Failed to Drop Into Core from 87 Inches on the Scram & All Rods in Group Were Not within Plus/Minus 8 Inches.Caused by Crud Buildup After Refueling | /03L-0 on 790122:following Plant Trip,Control Room Operator Found Rod 22 Failed to Drop Into Core from 87 Inches on the Scram & All Rods in Group Were Not within Plus/Minus 8 Inches.Caused by Crud Buildup After Refueling | |
| 05000029/LER-1979-002, Forwards LER 79-002/03L-0 | Forwards LER 79-002/03L-0 | |
| 05000029/LER-1979-003-03, /03L-0 on 790112:during Unscheduled Shutdown,Steam Generator Chloride Concentration Exceeded 0.5 Ppm Tech Spec Limit.Caused by Steam Generators Chemical Hideout | /03L-0 on 790112:during Unscheduled Shutdown,Steam Generator Chloride Concentration Exceeded 0.5 Ppm Tech Spec Limit.Caused by Steam Generators Chemical Hideout | |
| 05000029/LER-1979-003, Forwards LER 79-003/03L-0 | Forwards LER 79-003/03L-0 | |
| 05000029/LER-1979-004-03, /03L-0 on 790206:Rod 6 Position Indicating Lights at 84,87 & 90 Inches Were Not Lit.Caused by Loose & Dirty Terminal Contact Surfaces.Contact Surfaces Cleaned & Tightened | /03L-0 on 790206:Rod 6 Position Indicating Lights at 84,87 & 90 Inches Were Not Lit.Caused by Loose & Dirty Terminal Contact Surfaces.Contact Surfaces Cleaned & Tightened | |
| 05000029/LER-1979-004, Forwards LER 79-004/03L-0 | Forwards LER 79-004/03L-0 | |
| 05000029/LER-1979-005, Forwards LER 79-005/03L-0 | Forwards LER 79-005/03L-0 | |
| 05000029/LER-1979-005-03, /03L-0 on 790214:while Performing Type C Test of TV-408,svc Water Leakage from Isolation Valve Exceeded Tech Spec.Caused by Foreign Matl Under Masoneilan 4 Inch Valve Seat.Valve Seat Cleaned & Retested Satisfactorily | /03L-0 on 790214:while Performing Type C Test of TV-408,svc Water Leakage from Isolation Valve Exceeded Tech Spec.Caused by Foreign Matl Under Masoneilan 4 Inch Valve Seat.Valve Seat Cleaned & Retested Satisfactorily | |
| 05000029/LER-1979-006, Forwards LER 79-006/99T-0 | Forwards LER 79-006/99T-0 | |
| 05000029/LER-1979-006-99, /99T-0 on 790219:fire Pump Running Alarm Received in Control Room & Leak Discovered.Caused by Uneven External Force Applied on Pipe by Trench Fill.Crack Sealed Using Compression Patch,Pressure Tested & Backfilled | /99T-0 on 790219:fire Pump Running Alarm Received in Control Room & Leak Discovered.Caused by Uneven External Force Applied on Pipe by Trench Fill.Crack Sealed Using Compression Patch,Pressure Tested & Backfilled | |
| 05000029/LER-1979-008-03, /03L-0:on 790225,during Normal Startup After Maint Outage,While Withdrawing Control Rod Group A,Control Rod 2 Became Inoperable & Misaligned.Caused by Galling on Interface of Lift Latch Support Tube & Latch Guide Tube | /03L-0:on 790225,during Normal Startup After Maint Outage,While Withdrawing Control Rod Group A,Control Rod 2 Became Inoperable & Misaligned.Caused by Galling on Interface of Lift Latch Support Tube & Latch Guide Tube | |
| 05000029/LER-1979-008, Forwards LER 79-008/03L-0 | Forwards LER 79-008/03L-0 | |
| 05000029/LER-1979-009, Forwards LER 79-009/03L-0 | Forwards LER 79-009/03L-0 | |
| 05000029/LER-1979-009-03, /03L-0:on 790226,while Preparing to Cool Down, Steam Dump Valve PC-V-102 Failed to Operate Per Tech Specs 3.6.2.Caused by Galling of Actuator Stem & Bushing.Actuator Refurbished,Tested & Returned to Svc | /03L-0:on 790226,while Preparing to Cool Down, Steam Dump Valve PC-V-102 Failed to Operate Per Tech Specs 3.6.2.Caused by Galling of Actuator Stem & Bushing.Actuator Refurbished,Tested & Returned to Svc | |
| 05000029/LER-1979-010-04, /04X-0:on 790213,while Performing Insp on Air Sample Pump Station A-3,air Sample Pump Found Inoperative. Caused by Bearing Failure on Motor Shaft.Bearing Replaced | /04X-0:on 790213,while Performing Insp on Air Sample Pump Station A-3,air Sample Pump Found Inoperative. Caused by Bearing Failure on Motor Shaft.Bearing Replaced | |
| 05000029/LER-1979-010, Forwards LER 79-010/04X-0 | Forwards LER 79-010/04X-0 | |
| 05000029/LER-1979-011, Forwards LER 79-011/03L-0 | Forwards LER 79-011/03L-0 | |
| 05000029/LER-1979-011-03, /03L-0:on 790303,primary Vent Stack Opened While Increasing Coolant Temp During Normal Plant Startup.Caused by Water in Detector Housing.Corrected by air-drying Housing,Replacing Detector, & Heat Tracing Line | /03L-0:on 790303,primary Vent Stack Opened While Increasing Coolant Temp During Normal Plant Startup.Caused by Water in Detector Housing.Corrected by air-drying Housing,Replacing Detector, & Heat Tracing Line | |
| 05000029/LER-1979-012, Forwards LER 79-012/03L-0 | Forwards LER 79-012/03L-0 | |
| 05000029/LER-1979-012-03, /03L-0:on 790312,during Normal Operation & Monthly Surveillance,Relay TDC-2 Operated at 12.52-s.Caused by Sticky Relay Mounted as Integral Part of Time Delay Relay, Due to Dust Buildup.Relay Replaced | /03L-0:on 790312,during Normal Operation & Monthly Surveillance,Relay TDC-2 Operated at 12.52-s.Caused by Sticky Relay Mounted as Integral Part of Time Delay Relay, Due to Dust Buildup.Relay Replaced | |
| 05000029/LER-1979-013, Forwards LER 79-013/03L-0 | Forwards LER 79-013/03L-0 | |
| 05000029/LER-1979-013-03, /03L-0:on 790303,safety Injection Accumulator Nitrogen Pressure Increased to 15 Psig Due to Inadvertent ECCS Initiation.Cause Attributed to Wide Reset Action of Low Main Coolant Pressure Sensor.Sensor Reset | /03L-0:on 790303,safety Injection Accumulator Nitrogen Pressure Increased to 15 Psig Due to Inadvertent ECCS Initiation.Cause Attributed to Wide Reset Action of Low Main Coolant Pressure Sensor.Sensor Reset | |
| 05000029/LER-1979-014, Forwards LER 79-014/03L-0 | Forwards LER 79-014/03L-0 | |
| 05000029/LER-1979-014-03, /03L-0:on 790412,CA-V-688 Valve Failed Containment Leakage Rate.Caused by Crud on Valve Seating Surface.Valve Isolated,Cleaned,Retested & Returned to Svc | /03L-0:on 790412,CA-V-688 Valve Failed Containment Leakage Rate.Caused by Crud on Valve Seating Surface.Valve Isolated,Cleaned,Retested & Returned to Svc | |
| 05000029/LER-1979-015, /00X-0 on 790501:during Collection of Direct External Radiation Monitors,Monitors at Stations 12 & 21 Were Found Missing.Cause of Loss Unknown.Monitors Replaced | /00X-0 on 790501:during Collection of Direct External Radiation Monitors,Monitors at Stations 12 & 21 Were Found Missing.Cause of Loss Unknown.Monitors Replaced | |
| 05000029/LER-1979-016-03, /03L-0 on 790607:steam Generator B Lowdown Radiation Monitor Failed Low.Caused by Failure of pre-amp Unit in Monitor.Unit Replaced W/Spare & Channel Returned to Normal | /03L-0 on 790607:steam Generator B Lowdown Radiation Monitor Failed Low.Caused by Failure of pre-amp Unit in Monitor.Unit Replaced W/Spare & Channel Returned to Normal | |
| 05000029/LER-1979-016, Forwards LER 79-016/03L-0 | Forwards LER 79-016/03L-0 | |
| 05000029/LER-1979-017-03, /03L-0 on 790607:steam Generator Blowdown Radiation Monitor Failed High.Caused by Failure of Rate Meter Unit Internal Circuits.Failed Printed Circuit Cards Replaced W/Spares & Channel Returned to Normal | /03L-0 on 790607:steam Generator Blowdown Radiation Monitor Failed High.Caused by Failure of Rate Meter Unit Internal Circuits.Failed Printed Circuit Cards Replaced W/Spares & Channel Returned to Normal | |
| 05000029/LER-1979-017, Forwards LER 79-017/03L-0 | Forwards LER 79-017/03L-0 | |
| 05000029/LER-1979-018-01, /01T-0 on 790727:informed of Deviation from Specified Value in Fuel Pin Pressure.Caused by Mfg Techniques.Mfg Changed Method of Prepressurization Employed at Fabrication Facility | /01T-0 on 790727:informed of Deviation from Specified Value in Fuel Pin Pressure.Caused by Mfg Techniques.Mfg Changed Method of Prepressurization Employed at Fabrication Facility | |
| 05000029/LER-1979-018, Forwards LER 79-018/01T-0 | Forwards LER 79-018/01T-0 | |
| 05000029/LER-1979-019, Forwards LER 79-019/04X-0 | Forwards LER 79-019/04X-0 | |
| 05000029/LER-1979-019-04, /04X-0:on 790801,direct External Radiation Monitor at Station 9 Was Missing.Cause Unknown.No Corrective Action Planned Other than Replacement of Missing Monitor | /04X-0:on 790801,direct External Radiation Monitor at Station 9 Was Missing.Cause Unknown.No Corrective Action Planned Other than Replacement of Missing Monitor | |
| 05000029/LER-1979-020, Forwards LER 79-020/03L-0 | Forwards LER 79-020/03L-0 | |
| 05000029/LER-1979-020-03, /03L-0:on 790813,during Leak Rate Surveillance Testing on VD-TV-202,leakage Past Upstream Isolation Valves Stopped Test.Caused by Leakage in Seat of One or More Valves.Valves to Be Tested on 790908 | /03L-0:on 790813,during Leak Rate Surveillance Testing on VD-TV-202,leakage Past Upstream Isolation Valves Stopped Test.Caused by Leakage in Seat of One or More Valves.Valves to Be Tested on 790908 | |
| 05000029/LER-1979-021-02, /02X-0:on 790911,during Maint Outage to Inspect Feedwater Piping as Required by IE Bulletin 79-13,welds Were Found Which Did Not Meet Code.Caused by Welding Process at Time of Fabrication.Welds Repaired or Replaced | /02X-0:on 790911,during Maint Outage to Inspect Feedwater Piping as Required by IE Bulletin 79-13,welds Were Found Which Did Not Meet Code.Caused by Welding Process at Time of Fabrication.Welds Repaired or Replaced | |
| 05000029/LER-1979-022-03, /03L-0:on 790908,chloride Concentration in Steam Generators 3 & 4 Was Greater than 0.5 Ppm.Caused by Steam Generator Chemical Hideout.Steam Generator Blowdown Rate Was Increased & Steam Generators Drained & Refilled | /03L-0:on 790908,chloride Concentration in Steam Generators 3 & 4 Was Greater than 0.5 Ppm.Caused by Steam Generator Chemical Hideout.Steam Generator Blowdown Rate Was Increased & Steam Generators Drained & Refilled | |
| 05000029/LER-1979-022, Forwards LER 79-022/03L-0 | Forwards LER 79-022/03L-0 | |
| 05000029/LER-1979-023-03, /03L-0:on 790930,480-volt Buses 4-1 & 5-2 Were de-energized.Caused by Need to Assure Personnel Safety While Installing Fire Barrier Foam | /03L-0:on 790930,480-volt Buses 4-1 & 5-2 Were de-energized.Caused by Need to Assure Personnel Safety While Installing Fire Barrier Foam | |
| 05000029/LER-1979-023, Forwards LER 79-023/03L-0 | Forwards LER 79-023/03L-0 | |
| 05000029/LER-1979-024, Forwards LER 79-024/03L-0 | Forwards LER 79-024/03L-0 | |
| 05000029/LER-1979-024-03, /03L-0:on 791004,during Maint shutdown,CS-MOV-540 Isolated for Repair,Keeping Flow Paths Inoperable.Caused by CS-MOV-540 Leaking by CS-MOV-540 Gate Valve Resulting in Insufficient Gate & Seat Contact.Gate Machined | /03L-0:on 791004,during Maint shutdown,CS-MOV-540 Isolated for Repair,Keeping Flow Paths Inoperable.Caused by CS-MOV-540 Leaking by CS-MOV-540 Gate Valve Resulting in Insufficient Gate & Seat Contact.Gate Machined | |
| 05000029/LER-1979-025-03, /03L-0:on 791019,bistable Setpoints Noted Operating Below Tech Specs Limit.Caused by Main Coolant Pressure Channel Bistable Calibr Drift.Setpoints Readjusted & Channel Design Change Developed | /03L-0:on 791019,bistable Setpoints Noted Operating Below Tech Specs Limit.Caused by Main Coolant Pressure Channel Bistable Calibr Drift.Setpoints Readjusted & Channel Design Change Developed | |
| 05000029/LER-1979-025, Forwards LER 79-025/03L-0 | Forwards LER 79-025/03L-0 | |
| 05000029/LER-1979-026, Forwards LER 79-026/01T-0 | Forwards LER 79-026/01T-0 | |
| 05000029/LER-1979-026-01, /01T-0:on 791026,computer Studies Revealed safety- Related Buses May Not Provide Required Voltage in Event of LOCA During Startup.Problem Exists When Main Generator Is Separated from Grid.Caused by Design Deficiency | /01T-0:on 791026,computer Studies Revealed safety- Related Buses May Not Provide Required Voltage in Event of LOCA During Startup.Problem Exists When Main Generator Is Separated from Grid.Caused by Design Deficiency | |
| 05000029/LER-1979-027, Forwards LER 79-027/03L-0 | Forwards LER 79-027/03L-0 | |
| 05000029/LER-1979-027-03, /03L-0:on 791105,during Plant Startup in Mode 3, post-accident Hydrogen Control Sys HV-SOV-1 & 2 Failed to Seat Properly.Caused by Oil & Dirt Buildup on Valve Internals.Valves Cleaned,Retested & Returned to Svc | /03L-0:on 791105,during Plant Startup in Mode 3, post-accident Hydrogen Control Sys HV-SOV-1 & 2 Failed to Seat Properly.Caused by Oil & Dirt Buildup on Valve Internals.Valves Cleaned,Retested & Returned to Svc | |