| | | Reporting criterion |
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| 05000313/LER-1978-001-04, /04L-0:during Fourth Quarter 1977,average Noble Gas Release Rate Exceeded Max Allowable Rate During Outage. Results Possibly False Due to Airborne Radioactivity in Counting Lab.Monitoring Sys Design Being Reviewed | /04L-0:during Fourth Quarter 1977,average Noble Gas Release Rate Exceeded Max Allowable Rate During Outage. Results Possibly False Due to Airborne Radioactivity in Counting Lab.Monitoring Sys Design Being Reviewed | |
| 05000313/LER-1978-001, Forwards LER 78-001/04L-0 | Forwards LER 78-001/04L-0 | |
| 05000313/LER-1978-001-01, /01T-0:on 780105,during Soluble Boron Shutdown Analysis for Another B&W Facility,Boric Acid Vol Deficiency Found.Caused by Change to Tech Specs W/O Changing Calculated Vol Requirement.Cycle 3 Tech Specs to Be Changed Soon | /01T-0:on 780105,during Soluble Boron Shutdown Analysis for Another B&W Facility,Boric Acid Vol Deficiency Found.Caused by Change to Tech Specs W/O Changing Calculated Vol Requirement.Cycle 3 Tech Specs to Be Changed Soon | |
| 05000313/LER-1978-002-03, /03L-0:on 780113,steam Supply Valve CV-2667 from Generator to Turbine Driver Failed to Open Remotely.Caused by Defective Valve Operator Torque Switch.Switch Replaced | /03L-0:on 780113,steam Supply Valve CV-2667 from Generator to Turbine Driver Failed to Open Remotely.Caused by Defective Valve Operator Torque Switch.Switch Replaced | |
| 05000368/LER-1978-002, Forwards LER 78-002/01T-0 | Forwards LER 78-002/01T-0 | |
| 05000368/LER-1978-002-01, /01T-0 on 780920:during Inspec,Discovered That Valves Had an Interference Between Valve Gate & Gate Guide. Caused by Design Problem Which Could Prevent Complete Valve Closure.Valves Returned to Manufacturer for Repairs | /01T-0 on 780920:during Inspec,Discovered That Valves Had an Interference Between Valve Gate & Gate Guide. Caused by Design Problem Which Could Prevent Complete Valve Closure.Valves Returned to Manufacturer for Repairs | |
| 05000368/LER-1978-003, Forwards LER 78-003/03L-0 | Forwards LER 78-003/03L-0 | |
| 05000313/LER-1978-003-03, /03L-0:on 780203,mist Spray from Reactor Coolant Pump Seal Leak Contaminated Reactor Bldg Areas.Cause Unknown.Leak Isolated & Bldg Areas Decontaminated | /03L-0:on 780203,mist Spray from Reactor Coolant Pump Seal Leak Contaminated Reactor Bldg Areas.Cause Unknown.Leak Isolated & Bldg Areas Decontaminated | |
| 05000368/LER-1978-003-03, /03L-0:on 780912,during Mode 3 Operation,Cst B Level Dropped to Less than 80% W/Cst a at About 10%.Caused by Inability of Makeup Tank to Produce Enough Quality Water to Maintain Level | /03L-0:on 780912,during Mode 3 Operation,Cst B Level Dropped to Less than 80% W/Cst a at About 10%.Caused by Inability of Makeup Tank to Produce Enough Quality Water to Maintain Level | |
| 05000368/LER-1978-004-03, /03L-0:on 780916,during Mode 3 Operation,Prior to Initial Criticality,Autotransformer Tripped from Timed Overcurrent.Caused by Feeding Both Unit Auxiliary Loads After Unit 1 Reactor Trip.Overcurrent Adjusted | /03L-0:on 780916,during Mode 3 Operation,Prior to Initial Criticality,Autotransformer Tripped from Timed Overcurrent.Caused by Feeding Both Unit Auxiliary Loads After Unit 1 Reactor Trip.Overcurrent Adjusted | |
| 05000313/LER-1978-004-03, /03L-1:on 780211,four Hydraulic Shock Suppressors Found Inoperable.Caused by Maladjustment,Corrosion & Metal Shavings in Valves.All 69 Suppressors Tested;One Had No Deficiency.Deficient Suppressors Repaired or Replaced | /03L-1:on 780211,four Hydraulic Shock Suppressors Found Inoperable.Caused by Maladjustment,Corrosion & Metal Shavings in Valves.All 69 Suppressors Tested;One Had No Deficiency.Deficient Suppressors Repaired or Replaced | |
| 05000313/LER-1978-004, Forwards LER 78-004/03L-1 | Forwards LER 78-004/03L-1 | |
| 05000313/LER-1978-005, Update to LER 78-005/01x-1:on 780302,during Inservice Insp of Tubing,Five Tubes Exceeded Plugging Limit of 40% of Nominal Tube Wall Thickness.Caused by Oxiding Aqueous Corrosion Mechanism.Defective Tubes Plugged | Update to LER 78-005/01x-1:on 780302,during Inservice Insp of Tubing,Five Tubes Exceeded Plugging Limit of 40% of Nominal Tube Wall Thickness.Caused by Oxiding Aqueous Corrosion Mechanism.Defective Tubes Plugged | |
| 05000368/LER-1978-005-03, /03L-0:on 780916,during Mode 3 Operation Prior to Initial Criticality,Onsite AC Power Distribution Sys Deenergized.Caused by Bus Feeder Breakers Tripping on Low Voltage Due to Overloading.Setpoints Adjusted | /03L-0:on 780916,during Mode 3 Operation Prior to Initial Criticality,Onsite AC Power Distribution Sys Deenergized.Caused by Bus Feeder Breakers Tripping on Low Voltage Due to Overloading.Setpoints Adjusted | |
| 05000313/LER-1978-005-03, /03L-0:on 780302,steam Generator Tube Indications Exceeded Plugging Limit on 40% of Nominal Wall Thickness. Caused by Defect Near Upper Tube Sheet.Tubes Plugged | /03L-0:on 780302,steam Generator Tube Indications Exceeded Plugging Limit on 40% of Nominal Wall Thickness. Caused by Defect Near Upper Tube Sheet.Tubes Plugged | |
| 05000368/LER-1978-006-03, /03L-0:on 780916,during Mode 3,prior to Initial Criticality,Raw Water Tank Level Dropped Below Tech Specs. Caused by ECCS Actuation Due to Loss of Relay Power to ECCS Components & Inverter Failure.Tank Level Increased | /03L-0:on 780916,during Mode 3,prior to Initial Criticality,Raw Water Tank Level Dropped Below Tech Specs. Caused by ECCS Actuation Due to Loss of Relay Power to ECCS Components & Inverter Failure.Tank Level Increased | |
| 05000313/LER-1978-006, Update to LER 78-006/01x-1:on 780305,during Reinstallation of Primary Manway Cover,Two of 16 Studs Sheared Off at Base of Nut on Second Torque Sequence Pass.Caused by 90% Crack in Diameter on One Stud | Update to LER 78-006/01x-1:on 780305,during Reinstallation of Primary Manway Cover,Two of 16 Studs Sheared Off at Base of Nut on Second Torque Sequence Pass.Caused by 90% Crack in Diameter on One Stud | |
| 05000313/LER-1978-006-03, /03L-0:on 780305,studs on Lower Steam Generator Primary Manway Cover Sheared Off.Caused by Crack of 90% of Stud Diameter.Studs Ultrasonically Checked for Cracks & One Removed | /03L-0:on 780305,studs on Lower Steam Generator Primary Manway Cover Sheared Off.Caused by Crack of 90% of Stud Diameter.Studs Ultrasonically Checked for Cracks & One Removed | |
| 05000313/LER-1978-007-03, /03L-0:on 780308,ventilation Dampers Failed to Seal Properly After Actuation.Caused by Sticky Air Supply Sys.Bladder Pressure Gauges Replaced & Air Supply re-adjusted | /03L-0:on 780308,ventilation Dampers Failed to Seal Properly After Actuation.Caused by Sticky Air Supply Sys.Bladder Pressure Gauges Replaced & Air Supply re-adjusted | |
| 05000368/LER-1978-007-03, /03L-0:on 780917,RCS Chloride Concentration Reduced to Less than 0.15ppm.Engineering Evaluation Determined Condition Should Have No Effect on Structural Integrity of RCS Based on out-of-limit Condition | /03L-0:on 780917,RCS Chloride Concentration Reduced to Less than 0.15ppm.Engineering Evaluation Determined Condition Should Have No Effect on Structural Integrity of RCS Based on out-of-limit Condition | |
| 05000313/LER-1978-008-03, /03L-0:on 780320,turbocharger for Diesel Generator 2 Caught Fire.Caused by Bearing Failure Between Air Inlet & Exhaust Turbine Bladings.Turbocharger Replaced | /03L-0:on 780320,turbocharger for Diesel Generator 2 Caught Fire.Caused by Bearing Failure Between Air Inlet & Exhaust Turbine Bladings.Turbocharger Replaced | |
| 05000313/LER-1978-008, Forwards LER 78-008/03L-0 | Forwards LER 78-008/03L-0 | |
| 05000368/LER-1978-008-03, /03L-0 on 781005:During Post-Core Hot Functional Testing,Pressurizer Code Safety Valve Was Gagged to Eliminate Weepage.Weepage Occurred Following Corrective Maintenance.Valve Was Allowed to Cool & Proper Oper Proved | /03L-0 on 781005:During Post-Core Hot Functional Testing,Pressurizer Code Safety Valve Was Gagged to Eliminate Weepage.Weepage Occurred Following Corrective Maintenance.Valve Was Allowed to Cool & Proper Oper Proved | |
| 05000368/LER-1978-008, Forwards LER 78-008/03L-0 | Forwards LER 78-008/03L-0 | |
| 05000313/LER-1978-009-01, /01T-0:on 780413,B&W Advised Util That Results of 0.04 Ft Squared RCS Pump Discharge Break Analysis Unacceptable.Caused by ECCS Analysis re-evaluation Performed for Newer B&W Plants | /01T-0:on 780413,B&W Advised Util That Results of 0.04 Ft Squared RCS Pump Discharge Break Analysis Unacceptable.Caused by ECCS Analysis re-evaluation Performed for Newer B&W Plants | |
| 05000368/LER-1978-009-03, /03L-0 on 781006:during Post-Core Hot Functional Test,Prior to Initial Criticality,Mode 3 Oper,Emergency Feedwater Valve 2CV-1025-1,hydraulic Pump Motor Failed. Motor Was Replaced & Tested Successfully | /03L-0 on 781006:during Post-Core Hot Functional Test,Prior to Initial Criticality,Mode 3 Oper,Emergency Feedwater Valve 2CV-1025-1,hydraulic Pump Motor Failed. Motor Was Replaced & Tested Successfully | |
| 05000368/LER-1978-009, Forwards LER 78-009/03L-0 | Forwards LER 78-009/03L-0 | |
| 05000313/LER-1978-009, Forwards LER 78-009/01T-0 | Forwards LER 78-009/01T-0 | |
| 05000368/LER-1978-010-01, /01T-0 on 781102:during Post-Core Hot Functional Test,Prior to Initial Criticality Mode 3 Oper,Lift Setpoints of Main Steam Line Code Safety Valves Were Nonconservative. Caused by Incorrect Identification of Simmer Point | /01T-0 on 781102:during Post-Core Hot Functional Test,Prior to Initial Criticality Mode 3 Oper,Lift Setpoints of Main Steam Line Code Safety Valves Were Nonconservative. Caused by Incorrect Identification of Simmer Point | |
| 05000368/LER-1978-010, Forwards LER 78-010/01T-0 | Forwards LER 78-010/01T-0 | |
| 05000313/LER-1978-010-03, /03L-0:on 780419,motor Operator of Standby Hydrogen Purge Isolation Valve CV-7449 Failed to Torque Out. Caused by Torque Switch Failure.Switch Replaced | /03L-0:on 780419,motor Operator of Standby Hydrogen Purge Isolation Valve CV-7449 Failed to Torque Out. Caused by Torque Switch Failure.Switch Replaced | |
| 05000313/LER-1978-011-03, /03L-0:on 780420,exhaust Fan VEF-37B Supply Breaker Tripped.Cause Unknown.Circuit Breaker & Overload Heater Replaced | /03L-0:on 780420,exhaust Fan VEF-37B Supply Breaker Tripped.Cause Unknown.Circuit Breaker & Overload Heater Replaced | |
| 05000368/LER-1978-012-03, /03L-0 on 781107:during Post-Core Hot Functional Testing B Condensate Storage Tank Dropped Below Tech Spec Minimum.Caused by Inability of Makeup Plants to Produce High Demand for Condensate | /03L-0 on 781107:during Post-Core Hot Functional Testing B Condensate Storage Tank Dropped Below Tech Spec Minimum.Caused by Inability of Makeup Plants to Produce High Demand for Condensate | |
| 05000368/LER-1978-012, Forwards LER 78-012/03L-0, 78-013/01T-0, 78-014/01T-0 & 78-015/01L-0 | Forwards LER 78-012/03L-0, 78-013/01T-0, 78-014/01T-0 & 78-015/01L-0 | |
| 05000313/LER-1978-013, Forwards LER 78-013/03L-0 | Forwards LER 78-013/03L-0 | |
| 05000313/LER-1978-013-03, /03L-0:on 780426,emergency Supply Fan VSF9 Failed to Start Automatically During Radiation Monitor RE-8001 Testing.Caused by Defective Actuating Solenoid.Solenoid Repaired | /03L-0:on 780426,emergency Supply Fan VSF9 Failed to Start Automatically During Radiation Monitor RE-8001 Testing.Caused by Defective Actuating Solenoid.Solenoid Repaired | |
| 05000368/LER-1978-013-01, /01T-0 on 781107:received Notice That Speed Switch Made by Dynalog Corp Had Design Problem That Could Cause Failure.Speed Switch Replaced | /01T-0 on 781107:received Notice That Speed Switch Made by Dynalog Corp Had Design Problem That Could Cause Failure.Speed Switch Replaced | |
| 05000368/LER-1978-014-01, /01T-0 on 781107:during Mode 3 Oper,Noted That First Cycle Plant Protec Sys Setpoint Changes Req by Rosemont Pressure Transmitter Substitution Were Less than Conservative.Caused by Failure to Change Setpoint | /01T-0 on 781107:during Mode 3 Oper,Noted That First Cycle Plant Protec Sys Setpoint Changes Req by Rosemont Pressure Transmitter Substitution Were Less than Conservative.Caused by Failure to Change Setpoint | |
| 05000313/LER-1978-014-03, /03L-0:on 780504,radiation Monitoring Sys Was Not Surveillance Tested on Schedule.Caused by Personnel Responsility Change.Quarterly Surveillance Rescheduled to Meet Frequency Requirement | /03L-0:on 780504,radiation Monitoring Sys Was Not Surveillance Tested on Schedule.Caused by Personnel Responsility Change.Quarterly Surveillance Rescheduled to Meet Frequency Requirement | |
| 05000313/LER-1978-015-03, /03L-0:on 780505,electric Driven Fire Pump Capacity Found Inadequate During Fire Water Sys Testing. Caused by Crack in Suction Bowl.Fire Pump Repaired | /03L-0:on 780505,electric Driven Fire Pump Capacity Found Inadequate During Fire Water Sys Testing. Caused by Crack in Suction Bowl.Fire Pump Repaired | |
| 05000368/LER-1978-015-01, /01T-0 on 781108:technician Installed Replacement Speed Switch in B Emergency Diesel Generator W/O Having Job Order Approved by Shift Supervisor.Due to Forgetfulness of Instru Technician | /01T-0 on 781108:technician Installed Replacement Speed Switch in B Emergency Diesel Generator W/O Having Job Order Approved by Shift Supervisor.Due to Forgetfulness of Instru Technician | |
| 05000368/LER-1978-016-03, /03L-0 on 781109:during Mode 3 Oper,Emergency Diesel Generator B Tripped from 100% Load.Caused by Damage to Rod & Main Bearings,Crankshaft & Pistons,Perhaps Due to Loose Baseplate Mounting Screw | /03L-0 on 781109:during Mode 3 Oper,Emergency Diesel Generator B Tripped from 100% Load.Caused by Damage to Rod & Main Bearings,Crankshaft & Pistons,Perhaps Due to Loose Baseplate Mounting Screw | |
| 05000313/LER-1978-016-03, /03L-0:on 780519,hydrogen Purge Lead Sys Supply Fan VSF-30A Tripped.Cause Unknown.Overload Relay Reset & Current Checked | /03L-0:on 780519,hydrogen Purge Lead Sys Supply Fan VSF-30A Tripped.Cause Unknown.Overload Relay Reset & Current Checked | |
| 05000368/LER-1978-016, Forwards LER 78-016/03L-0 | Forwards LER 78-016/03L-0 | |
| 05000313/LER-1978-016, Forwards LER 78-016/03L-0 | Forwards LER 78-016/03L-0 | |
| 05000368/LER-1978-017, Forwards LER 78-017/01T-0 & RO 50-368/78-17 | Forwards LER 78-017/01T-0 & RO 50-368/78-17 | |
| 05000368/LER-1978-018, Forwards LER 78-018/03L-0 & 78-019/03l-0 | Forwards LER 78-018/03L-0 & 78-019/03l-0 | |
| 05000368/LER-1978-018-03, /03L-0 on 781128:both Doors of the Personnel Hatch Doors Were Simultaneously Opened,Caused by a Sheared Mechanical Door Interrlock Gear Key.Mechanical Interlock Repairs Made & Containment Air Lock Declared Operable | /03L-0 on 781128:both Doors of the Personnel Hatch Doors Were Simultaneously Opened,Caused by a Sheared Mechanical Door Interrlock Gear Key.Mechanical Interlock Repairs Made & Containment Air Lock Declared Operable | |
| 05000313/LER-1978-019, Forwards Updated LER 78-019/01X-1 | Forwards Updated LER 78-019/01X-1 | |
| 05000313/LER-1978-019-01, B&W Discovered That Weld Filler Wire Atypical of Submerged Arc Weld Filler Wires Specified,Was Unknowingly Mixed by Supplier.Pressure/Temp Curves Revised Then Later Reverted to Original Curves | B&W Discovered That Weld Filler Wire Atypical of Submerged Arc Weld Filler Wires Specified,Was Unknowingly Mixed by Supplier.Pressure/Temp Curves Revised Then Later Reverted to Original Curves | |
