| | | Reporting criterion |
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| 05000251/LER-1979-001, Forwards LER 79-001/03L-0 | Forwards LER 79-001/03L-0 | |
| 05000251/LER-1979-001-03, /03L-0 on 790125:4A Boric Acid Transfer Pump Tripper on Thermal Overload Inoperable.Caused by Incomplete Reinstallation of Recirculation Line Insulation.New Recirculation Line Installed | /03L-0 on 790125:4A Boric Acid Transfer Pump Tripper on Thermal Overload Inoperable.Caused by Incomplete Reinstallation of Recirculation Line Insulation.New Recirculation Line Installed | |
| 05000250/LER-1979-001-31, /031-0 on 790213:A Fire Pump Found to Be Inoperable.Caused by Improper Operation of Power Supply Breaker.Procedural Methods Implemented to Ensure That Fire Pump Power Is Verified After Each Shift | /031-0 on 790213:A Fire Pump Found to Be Inoperable.Caused by Improper Operation of Power Supply Breaker.Procedural Methods Implemented to Ensure That Fire Pump Power Is Verified After Each Shift | |
| 05000250/LER-1979-001, Forwards LER 79-001/031-0 | Forwards LER 79-001/031-0 | |
| 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 | 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-1979-002, Forwards LER 79-002/03L-0 | Forwards LER 79-002/03L-0 | |
| 05000251/LER-1979-002-03, /03L-0 on 790310:during Cold Shutdown,Cracks Observed in 4B Charging Pump Suction Piping.Probably Caused by Design/Installation of Positive Displacement Pumps. Welds Repaired & Mods Made to Reduce Stresses | /03L-0 on 790310:during Cold Shutdown,Cracks Observed in 4B Charging Pump Suction Piping.Probably Caused by Design/Installation of Positive Displacement Pumps. Welds Repaired & Mods Made to Reduce Stresses | |
| 05000251/LER-1979-003, Forwards LER 79-003/03L-0 | Forwards LER 79-003/03L-0 | |
| 05000250/LER-1979-003-01, /01T-0:on 791101,NSSS Vendor Identified & Corrected Input Error in Two LOCA Analyses.Caused by Use of Incorrect Method.Procedures Revised | /01T-0:on 791101,NSSS Vendor Identified & Corrected Input Error in Two LOCA Analyses.Caused by Use of Incorrect Method.Procedures Revised | |
| 05000251/LER-1979-003-03, /03L-0 on 790315:during Normal Operation,Crack Observed in 4C Charging Pump Suction Piping.Caused by Design/Installation of Pumps Resulting in Operational Pressure Pulsation/Vibration Effects.Weld Repaired | /03L-0 on 790315:during Normal Operation,Crack Observed in 4C Charging Pump Suction Piping.Caused by Design/Installation of Pumps Resulting in Operational Pressure Pulsation/Vibration Effects.Weld Repaired | |
| 05000251/LER-1979-004, Forwards LER 79-004/03L-0 | Forwards LER 79-004/03L-0 | |
| 05000251/LER-1979-004-03, /03L-0 on 790315:vendor Reported Main Steam Line Mechanical Snubber,Returned for Routine Testing,Was in locked-up Condition.Caused by Damaged Thrust Bearing. X-stop Adjusted | /03L-0 on 790315:vendor Reported Main Steam Line Mechanical Snubber,Returned for Routine Testing,Was in locked-up Condition.Caused by Damaged Thrust Bearing. X-stop Adjusted | |
| 05000251/LER-1979-005-03, /03L-0 on 790322:process Radiation Monitors R-11 & R-12 Were Out of Svc.Caused by Failure of Air Sampling Blower Which Supplies Monitors.Blower Replaced & Monitors Returned to Svc | /03L-0 on 790322:process Radiation Monitors R-11 & R-12 Were Out of Svc.Caused by Failure of Air Sampling Blower Which Supplies Monitors.Blower Replaced & Monitors Returned to Svc | |
| 05000251/LER-1979-005, Forwards LER 79-005/03L-0 | Forwards LER 79-005/03L-0 | |
| 05000251/LER-1979-006, Forwards LER 79-006/03L-0 | Forwards LER 79-006/03L-0 | |
| 05000251/LER-1979-006-03, /03L-0 on 790322:packing leak-off Observed on Three Valves.Cause Undetermined for Two Valves.Leaking Packing on Third Due to Broken Bellows Seal.Unit in Reeling Shutdown;Repairs Will Be Made Before Return to Power | /03L-0 on 790322:packing leak-off Observed on Three Valves.Cause Undetermined for Two Valves.Leaking Packing on Third Due to Broken Bellows Seal.Unit in Reeling Shutdown;Repairs Will Be Made Before Return to Power | |
| 05000251/LER-1979-007-01, /01T-0 on 790519:inoperable Pipe Support 4-VCH-105 Reported by Insp Team.Cause Unknown.Pipe Support to Be Restored Per Approved Procedures | /01T-0 on 790519:inoperable Pipe Support 4-VCH-105 Reported by Insp Team.Cause Unknown.Pipe Support to Be Restored Per Approved Procedures | |
| 05000251/LER-1979-008-03, /03X-1 on 790526:while Safeguards Sys Was Being tested,4A 4,160-volt Bus Failed to Strip in Required Time, Causing Emergency Diesel Generator to Stop.Cause Not Determined.Testing Procedures Revised | /03X-1 on 790526:while Safeguards Sys Was Being tested,4A 4,160-volt Bus Failed to Strip in Required Time, Causing Emergency Diesel Generator to Stop.Cause Not Determined.Testing Procedures Revised | |
| 05000251/LER-1979-008, Forwards LER 79-008/03X-1 | Forwards LER 79-008/03X-1 | |
| 05000251/LER-1979-009, Forwards LER 79-009/03L-1 | Forwards LER 79-009/03L-1 | |
| 05000250/LER-1979-009-03, During Refueling Shutdown,Leak Observed from Temporary Level Indication Line Near Base of Refueling Water Storage Tank.Cause Undetermined.Integrity of Piping & Instrumentation Verified | During Refueling Shutdown,Leak Observed from Temporary Level Indication Line Near Base of Refueling Water Storage Tank.Cause Undetermined.Integrity of Piping & Instrumentation Verified | |
| 05000250/LER-1979-009, Forwards Updated LER 79-009/03X-1 | Forwards Updated LER 79-009/03X-1 | |
| 05000251/LER-1979-009-03, /03L-1:on 790611,mechanical Snubber on Steam Generator C Feedwater Line Found in locked-up Condition. Caused by Snubber Overload Resulting in Damage to Thrust Bearing.Snubber Will Be Replaced w/50,000 Lb Rated Snubber | /03L-1:on 790611,mechanical Snubber on Steam Generator C Feedwater Line Found in locked-up Condition. Caused by Snubber Overload Resulting in Damage to Thrust Bearing.Snubber Will Be Replaced w/50,000 Lb Rated Snubber | |
| 05000251/LER-1979-010-01, /01T-0 on 790626:NSSS Vendor Notified Util of Potential Level Bias Which Could Delay Reactor Trip & Feedwater Initiation or Cause False Level Indications. License Amend Will Be Proposed to Increase Sys Setpoint | /01T-0 on 790626:NSSS Vendor Notified Util of Potential Level Bias Which Could Delay Reactor Trip & Feedwater Initiation or Cause False Level Indications. License Amend Will Be Proposed to Increase Sys Setpoint | |
| 05000251/LER-1979-010, Forwards LER 79-010/01T-0 | Forwards LER 79-010/01T-0 | |
| 05000250/LER-1979-010-03, /03X-1 on 790319:excessive Leakage Noted at Inner Personnel Airlock Door/Bulkhead.Caused by Packing Leak Along Operating Shaft at Inner Bulkhead.Local Leak Test Completed Successfully | /03X-1 on 790319:excessive Leakage Noted at Inner Personnel Airlock Door/Bulkhead.Caused by Packing Leak Along Operating Shaft at Inner Bulkhead.Local Leak Test Completed Successfully | |
| 05000250/LER-1979-010, Forwards LER 79-010/03X-1 | Forwards LER 79-010/03X-1 | |
| 05000251/LER-1979-011-03, Charging Sys Performance Noted to Be Degraded During Routine Startup Operation.Caused by Ruptured Diaphragm & Damaged O-ring on Valve.Valve Repaired & Pumps Vented | Charging Sys Performance Noted to Be Degraded During Routine Startup Operation.Caused by Ruptured Diaphragm & Damaged O-ring on Valve.Valve Repaired & Pumps Vented | |
| 05000251/LER-1979-011, Forwards Updated LER 79-011/03X-1 | Forwards Updated LER 79-011/03X-1 | |
| 05000251/LER-1979-012, Forwards LER 79-012/03L-0 | Forwards LER 79-012/03L-0 | |
| 05000251/LER-1979-012-03, /03L-0:on 790806,periodic Test of T & delta-T Not Completed within Required Time Limit Due to Investigation of Unit Trip.Surveillance Completed Following Recovery from Unit Trip | /03L-0:on 790806,periodic Test of T & delta-T Not Completed within Required Time Limit Due to Investigation of Unit Trip.Surveillance Completed Following Recovery from Unit Trip | |
| 05000251/LER-1979-013-03, /03L-0:on 790815,charging Pump 4A Removed from Svc Due to Excessive Seal Leakage.Cause Under Investigation. Seal Was Replaced & Pump Tested & Returned to Svc | /03L-0:on 790815,charging Pump 4A Removed from Svc Due to Excessive Seal Leakage.Cause Under Investigation. Seal Was Replaced & Pump Tested & Returned to Svc | |
| 05000251/LER-1979-013, Forwards LER 79-013/03L-0 | Forwards LER 79-013/03L-0 | |
| 05000251/LER-1979-014-01, /01T-0:on 790828,during Performance of Evaluation to Place Spent Fuel Pit Purification Demineralizer in Svc, 3,000 Gallon Overflow Occurred.Caused by Incomplete Communication & Failure to Follow Procedure.Unit Cleaned | /01T-0:on 790828,during Performance of Evaluation to Place Spent Fuel Pit Purification Demineralizer in Svc, 3,000 Gallon Overflow Occurred.Caused by Incomplete Communication & Failure to Follow Procedure.Unit Cleaned | |
| 05000251/LER-1979-014, Forwards LER 79-014/01T-0 | Forwards LER 79-014/01T-0 | |
| 05000250/LER-1979-014, Forwards LER 79-014/03L-0 | Forwards LER 79-014/03L-0 | |
| 05000250/LER-1979-014-03, /03L-0 on 790424:ready to Start Light on B Emergency Diesel Generator Engine Control Panel Failed. Caused by Vibration of Lamp Socket.Tests Under Way to Determine If Neon Unit Would Be Better Suited | /03L-0 on 790424:ready to Start Light on B Emergency Diesel Generator Engine Control Panel Failed. Caused by Vibration of Lamp Socket.Tests Under Way to Determine If Neon Unit Would Be Better Suited | |
| 05000251/LER-1979-015-03, /03L-0:on 790829,during Power operation,4A Boric Acid Transfer Pump Tripped on Thermal Overload & Declared Inoperable.Caused by Boric Acid Solidification in Recirculation Line.Recirculation Line Insulated | /03L-0:on 790829,during Power operation,4A Boric Acid Transfer Pump Tripped on Thermal Overload & Declared Inoperable.Caused by Boric Acid Solidification in Recirculation Line.Recirculation Line Insulated | |
| 05000250/LER-1979-015-03, /03L-0 on 790426:B Emergency Diesel Generator Failed Loading Acceptance Criteria.Caused by Cracked half-inch Nipple to Fuel Pump Which Resulted in Partial Fuel Starvation.Nipple Replaced & Old Nipple Reanalyzed | /03L-0 on 790426:B Emergency Diesel Generator Failed Loading Acceptance Criteria.Caused by Cracked half-inch Nipple to Fuel Pump Which Resulted in Partial Fuel Starvation.Nipple Replaced & Old Nipple Reanalyzed | |
| 05000250/LER-1979-015, Forwards LER 79-015/03L-0 | Forwards LER 79-015/03L-0 | |
| 05000251/LER-1979-015, Forwards LER 79-015/03L-0 | Forwards LER 79-015/03L-0 | |
| 05000251/LER-1979-016, Forwards LER 79-016/03L-0 | Forwards LER 79-016/03L-0 | |
| 05000251/LER-1979-016-03, /03L-0:on 790830,boric Acid Transfer Pump Failed to Start.Caused by Malfunction of Line Starter.Contacts Were Cleaned & Pump Was Returned to Svc | /03L-0:on 790830,boric Acid Transfer Pump Failed to Start.Caused by Malfunction of Line Starter.Contacts Were Cleaned & Pump Was Returned to Svc | |
| 05000250/LER-1979-016, Forwards LER 79-016/03L-0 | Forwards LER 79-016/03L-0 | |
| 05000250/LER-1979-016-03, /03L-0 on 790429:high Level Alarm Annunciated. Caused by Instrument Drift of Tech Spec Min & High Level Alarms & Digital Level Indicator Transducer.Instruments Recalibr | /03L-0 on 790429:high Level Alarm Annunciated. Caused by Instrument Drift of Tech Spec Min & High Level Alarms & Digital Level Indicator Transducer.Instruments Recalibr | |
| 05000251/LER-1979-017-03, /03L-0:on 790903,condensate Water Tank Contained Less than 185,000 Gallons Required by Tech Specs.Caused by Increased Water Demand for Steam Generator Blowdown & Reduced Water Treatment Plant Output | /03L-0:on 790903,condensate Water Tank Contained Less than 185,000 Gallons Required by Tech Specs.Caused by Increased Water Demand for Steam Generator Blowdown & Reduced Water Treatment Plant Output | |
| 05000251/LER-1979-017, Forwards LER 79-017/03L-0 | Forwards LER 79-017/03L-0 | |
| 05000250/LER-1979-017-03, /03X-1 on 781218:during Normal Operation,Efforts Were Made to Determine Source of Intermittent Radioactive Gas Leak.Caused by Possible Deformation of Small Section of Tank Shell.Defect Will Be Repaired | /03X-1 on 781218:during Normal Operation,Efforts Were Made to Determine Source of Intermittent Radioactive Gas Leak.Caused by Possible Deformation of Small Section of Tank Shell.Defect Will Be Repaired | |
| 05000251/LER-1979-018-03, /03L-0:on 790911,charging Pump 4C Removed from Svc Due to Excessive Seal Leakage.Cause Not Given.Seal Was Replaced & Pump Returned to Svc.Evaluation Continues | /03L-0:on 790911,charging Pump 4C Removed from Svc Due to Excessive Seal Leakage.Cause Not Given.Seal Was Replaced & Pump Returned to Svc.Evaluation Continues | |
| 05000251/LER-1979-018, Forwards LER 79-018/03L-0 | Forwards LER 79-018/03L-0 | |
