| | | Reporting criterion |
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| 05000315/LER-1979-001-03, /03L-0 on 790122:during Mode 1,position of Rod F-6 Showed Deviation of Greater than 12 Steps from Demand Position.Caused by Drift in Signal Conditioning Module | /03L-0 on 790122:during Mode 1,position of Rod F-6 Showed Deviation of Greater than 12 Steps from Demand Position.Caused by Drift in Signal Conditioning Module | |
| 05000316/LER-1979-001-03, /03L-0 on 790111:at 100% Power,Quadrant Power Tilt Ratio Alarm Per Tech Spec 4.2.4 Was in Error.Calculation of Tilt Ratio Is Required Every 12-h;first Survey Was Missed Because Alarm Instruments Were Being Calibr | /03L-0 on 790111:at 100% Power,Quadrant Power Tilt Ratio Alarm Per Tech Spec 4.2.4 Was in Error.Calculation of Tilt Ratio Is Required Every 12-h;first Survey Was Missed Because Alarm Instruments Were Being Calibr | |
| 05000316/LER-1979-001, Forwards LER 79-001/03L-0 | Forwards LER 79-001/03L-0 | |
| 05000315/LER-1979-001, Forwards LER 79-001/03L-0 | Forwards LER 79-001/03L-0 | |
| 05000315/LER-1979-002-03, /03X-1:on 790127,injection of Boric Acid Caused Increase of Neutron Flux in Reactor Core.Axial Flux Difference Exceed Limits & Alarm Did Not Function Properly. Caused by Hardware Failure | /03X-1:on 790127,injection of Boric Acid Caused Increase of Neutron Flux in Reactor Core.Axial Flux Difference Exceed Limits & Alarm Did Not Function Properly. Caused by Hardware Failure | |
| 05000316/LER-1979-002-03, /03L-0 on 790106:during Startup,Auxiliary Feedwater Motor Operated Valve Would Not Close Due to Broken Wire in SMB-0-25 Operator.Caused by Vibration & Use of Solid Conductor | /03L-0 on 790106:during Startup,Auxiliary Feedwater Motor Operated Valve Would Not Close Due to Broken Wire in SMB-0-25 Operator.Caused by Vibration & Use of Solid Conductor | |
| 05000315/LER-1979-002, Forwards LER 79-002/03L-0 | Forwards LER 79-002/03L-0 | |
| 05000316/LER-1979-003-03, /03L-0 on 790106:reactor Trip/Safety Injection Occurred.Caused by Freezing of Steam Generator/Main Steam Pressure Sensing Lines.Freezing Due to Failure to Close Off Steam Vent Openings in West Steam Encl | /03L-0 on 790106:reactor Trip/Safety Injection Occurred.Caused by Freezing of Steam Generator/Main Steam Pressure Sensing Lines.Freezing Due to Failure to Close Off Steam Vent Openings in West Steam Encl | |
| 05000315/LER-1979-003-03, /03L-0 on 790120:during Review of Completed Surveillance Tests,Discovered That Test on Solid State Protection Sys Train a Exceed 1-h Limit Imposed by Tech Specs.Caused by Technician Overlooking 1-h Limit | /03L-0 on 790120:during Review of Completed Surveillance Tests,Discovered That Test on Solid State Protection Sys Train a Exceed 1-h Limit Imposed by Tech Specs.Caused by Technician Overlooking 1-h Limit | |
| 05000316/LER-1979-004-01, /01T-0 on 780802:turbine Low Fluid Oil Pressure Switches Set at non-conservative Value.Initially Calibr at Vendors Recommended Setpoints;Were Not Recalibr Per Tech Specs | /01T-0 on 780802:turbine Low Fluid Oil Pressure Switches Set at non-conservative Value.Initially Calibr at Vendors Recommended Setpoints;Were Not Recalibr Per Tech Specs | |
| 05000316/LER-1979-004, Forwards LER 79-004/01T-0,79-005/03L-0 & 79-006/03L-0 | Forwards LER 79-004/01T-0,79-005/03L-0 & 79-006/03L-0 | |
| 05000315/LER-1979-004-03, /03L-0 on 790206:both Doors of Containment Airlock Were Inadvertently Opened.Caused by Interlock Cable Being Too Loose to Operate Locking Mechanism.Tension Was Adjusted & Interlock Then Tested Satisfactorily | /03L-0 on 790206:both Doors of Containment Airlock Were Inadvertently Opened.Caused by Interlock Cable Being Too Loose to Operate Locking Mechanism.Tension Was Adjusted & Interlock Then Tested Satisfactorily | |
| 05000315/LER-1979-004, Forwards LER 79-004/03L-0 | Forwards LER 79-004/03L-0 | |
| 05000315/LER-1979-005-03, /03L-0 on 780624:unit Was Operated W/Positive Moderator Temp Coefficient for 3-h.Caused by Rod Withdrawal & Consequent Xe Build Up.Procedure Being Revised | /03L-0 on 780624:unit Was Operated W/Positive Moderator Temp Coefficient for 3-h.Caused by Rod Withdrawal & Consequent Xe Build Up.Procedure Being Revised | |
| 05000316/LER-1979-005-03, /03L-0 on 790117:solid State Protection Sys Tested Unsatisfactorily.Caused by Failure of Universal Logic Card A-214 | /03L-0 on 790117:solid State Protection Sys Tested Unsatisfactorily.Caused by Failure of Universal Logic Card A-214 | |
| 05000315/LER-1979-006-03, /03L-0 on 790208:pressurizer Relief Tank Diaphragm Ruptured,Causing Ice Condenser Inlet Doors to Be Indicated Open.Caused by Pressure Surge in Lower Containment.Unit Shut Down & Doors Closed | /03L-0 on 790208:pressurizer Relief Tank Diaphragm Ruptured,Causing Ice Condenser Inlet Doors to Be Indicated Open.Caused by Pressure Surge in Lower Containment.Unit Shut Down & Doors Closed | |
| 05000316/LER-1979-006-03, /03L-0 on 790123:svc Water Supply Check Valve to AB diesel,ESW-143,failed to Seat.Caused by Normal Wear of Split Center Disc of Carbon Steel Check Valve,Centerline Part D-10495-26 | /03L-0 on 790123:svc Water Supply Check Valve to AB diesel,ESW-143,failed to Seat.Caused by Normal Wear of Split Center Disc of Carbon Steel Check Valve,Centerline Part D-10495-26 | |
| 05000316/LER-1979-007, Forwards LER 79-007/03L-0 | Forwards LER 79-007/03L-0 | |
| 05000316/LER-1979-007-03, /03L-0 on 790213:during Surveillance Test on Containment Pressure Set 3,high-high Bistable Trip Point Was Found to Exceed Tech Specs.Caused by Drifting Bistable. Bistable,Westinghouse Model 63V-BC-OHEA-F,was Replaced | /03L-0 on 790213:during Surveillance Test on Containment Pressure Set 3,high-high Bistable Trip Point Was Found to Exceed Tech Specs.Caused by Drifting Bistable. Bistable,Westinghouse Model 63V-BC-OHEA-F,was Replaced | |
| 05000315/LER-1979-007-03, /03L-0 on 790218:suction Valve of West Centrifugal Charging Pump Found Closed.Caused by Mistaken Closing Following Surveillance Testing.Incident Is Being Reviewed | /03L-0 on 790218:suction Valve of West Centrifugal Charging Pump Found Closed.Caused by Mistaken Closing Following Surveillance Testing.Incident Is Being Reviewed | |
| 05000316/LER-1979-008-03, /03L-0 on 790303:main Turbine Stop Valve C Closure Limit Switch Failed Conservatively (Closure Indication Received).Cause Unknown.Switch Replaced | /03L-0 on 790303:main Turbine Stop Valve C Closure Limit Switch Failed Conservatively (Closure Indication Received).Cause Unknown.Switch Replaced | |
| 05000316/LER-1979-008, Forwards LER 79-008/03L-0 | Forwards LER 79-008/03L-0 | |
| 05000315/LER-1979-008-03, /03L-0 on 790207:containment Atmospheric Air Particulate & Gaseous Radiation Monitoring Sys Pump Was Continuously Tripping.Caused by Misalignment of Pump Bypass Flow Adjustments Due to Normal Pump Wear.Flow Rate Adjusted | /03L-0 on 790207:containment Atmospheric Air Particulate & Gaseous Radiation Monitoring Sys Pump Was Continuously Tripping.Caused by Misalignment of Pump Bypass Flow Adjustments Due to Normal Pump Wear.Flow Rate Adjusted | |
| 05000315/LER-1979-009-03, /03L-0 on 790223:in Mode 1 Both Emergency Diesel Generators Were Inoperable on Separate Occasions.Caused by AB Diesel Generator Running in Parallel & Other Emergency Generator Out for Maint.Operating Procedures Revised | /03L-0 on 790223:in Mode 1 Both Emergency Diesel Generators Were Inoperable on Separate Occasions.Caused by AB Diesel Generator Running in Parallel & Other Emergency Generator Out for Maint.Operating Procedures Revised | |
| 05000316/LER-1979-009-03, /03L-0 on 790303:2W Svc Water Pump Amp Pegged Meter Stopped,Constituting Inoperable Pump.Caused by Burr Formed Between Impeller Ring & Bowl.Pump Shaft & Bowl Replaced | /03L-0 on 790303:2W Svc Water Pump Amp Pegged Meter Stopped,Constituting Inoperable Pump.Caused by Burr Formed Between Impeller Ring & Bowl.Pump Shaft & Bowl Replaced | |
| 05000316/LER-1979-009, Forwards LER 79-009/03L-0 | Forwards LER 79-009/03L-0 | |
| 05000315/LER-1979-010-03, /03X-1 on 790223:diesel Essential Svc Water Check Valves 1-ESW-111 & 1-ESW-114 Not Functioning Properly.Caused by Excessive Wear at Split Disc Hinge Points.Discs Replaced | /03X-1 on 790223:diesel Essential Svc Water Check Valves 1-ESW-111 & 1-ESW-114 Not Functioning Properly.Caused by Excessive Wear at Split Disc Hinge Points.Discs Replaced | |
| 05000315/LER-1979-010, Forwards LER 79-010/03X-1 | Forwards LER 79-010/03X-1 | |
| 05000316/LER-1979-010, Forwards LER 79-010/03L-0 | Forwards LER 79-010/03L-0 | |
| 05000316/LER-1979-010-03, /03L-0 on 790306:during Surveillance Test on Turbine Driven Auxiliary Feed Pump,Pump Was Over Max Recommended Temp.Possible Cause Was Foreign Matl in Bearing Oil.Oil Was Changed | /03L-0 on 790306:during Surveillance Test on Turbine Driven Auxiliary Feed Pump,Pump Was Over Max Recommended Temp.Possible Cause Was Foreign Matl in Bearing Oil.Oil Was Changed | |
| 05000316/LER-1979-011, Forwards LER 79-011/03L-0 | Forwards LER 79-011/03L-0 | |
| 05000316/LER-1979-011-03, /03L-0 on 790327:outer Door Seal of Lower Containment Air Lock Found Leaking.Caused by Force Placed on Seal During Installation of Security Gate at Air Lock Entrance.Seal Tightened & Outer Seal Retested | /03L-0 on 790327:outer Door Seal of Lower Containment Air Lock Found Leaking.Caused by Force Placed on Seal During Installation of Security Gate at Air Lock Entrance.Seal Tightened & Outer Seal Retested | |
| 05000315/LER-1979-011-03, /03L-0 on 790223:auxiliary Feedwater Discharge Valve Would Not Close from Control Room.Caused by Loose Connection in Hot Shutdown Panel.Connection Tightened & Correct Valve Operation Verified | /03L-0 on 790223:auxiliary Feedwater Discharge Valve Would Not Close from Control Room.Caused by Loose Connection in Hot Shutdown Panel.Connection Tightened & Correct Valve Operation Verified | |
| 05000316/LER-1979-012-03, /03L-0 on 790330:hydraulic Control Values Did Not Return to Normal Position Placing Hydraulic Lock on Operator Cylinder.Caused by Dirt in Hydraulic Pilot Valve.Hydraulic Fluid Replaced | /03L-0 on 790330:hydraulic Control Values Did Not Return to Normal Position Placing Hydraulic Lock on Operator Cylinder.Caused by Dirt in Hydraulic Pilot Valve.Hydraulic Fluid Replaced | |
| 05000315/LER-1979-012-03, /03L-0 on 790226:containment Air Monitor Pump Overheated.Caused by Worn Rubber Spider in Lovejoy L-100 Coupling.Spider Replaced & Air Sampler Retested | /03L-0 on 790226:containment Air Monitor Pump Overheated.Caused by Worn Rubber Spider in Lovejoy L-100 Coupling.Spider Replaced & Air Sampler Retested | |
| 05000316/LER-1979-012, Forwards LER 79-012/03L-0 | Forwards LER 79-012/03L-0 | |
| 05000315/LER-1979-013-03, /03L-0 on 790303:auxiliary Feed Valve FMO-212 Would Not Shut from Control Room.Caused by Broken Wire in Valves Motor Operator.Breakage Is a Result of Vibration & Use of Solid Conductor Wire.Wire Replaced | /03L-0 on 790303:auxiliary Feed Valve FMO-212 Would Not Shut from Control Room.Caused by Broken Wire in Valves Motor Operator.Breakage Is a Result of Vibration & Use of Solid Conductor Wire.Wire Replaced | |
| 05000316/LER-1979-013-03, /03L-0 on 790407:during Rapid Shutdown,Pressure Was Allowed to Drop to 2,190 Lb Psig.Caused by Spray Valve Which Was Slow to Respond.Spray Placed in Manual & Throttled Back | /03L-0 on 790407:during Rapid Shutdown,Pressure Was Allowed to Drop to 2,190 Lb Psig.Caused by Spray Valve Which Was Slow to Respond.Spray Placed in Manual & Throttled Back | |
| 05000315/LER-1979-014-03, /03L-0 on 790301:while in Mode 1,indicated Position of Rod F-6 Discovered to Be Oscillating within 15 Steps of Bank Demand Position.Caused by Signal Conditioning Module Connector.Cleaning & Reinstallation Corrected Limits | /03L-0 on 790301:while in Mode 1,indicated Position of Rod F-6 Discovered to Be Oscillating within 15 Steps of Bank Demand Position.Caused by Signal Conditioning Module Connector.Cleaning & Reinstallation Corrected Limits | |
| 05000315/LER-1979-014, Forwards LER 79-014/03L-0 & 79-015/03L-0 | Forwards LER 79-014/03L-0 & 79-015/03L-0 | |
| 05000316/LER-1979-014-03, /03L-0 on 790404:on Two Occasions Rod Position Indication Exceeded 12-step Limit.Caused by Drifting of Signal Conditioning Modules,Which Were Adjusted for Proper Output | /03L-0 on 790404:on Two Occasions Rod Position Indication Exceeded 12-step Limit.Caused by Drifting of Signal Conditioning Modules,Which Were Adjusted for Proper Output | |
| 05000315/LER-1979-015-03, /03L-0 on 790302:while Operating at Full Power, Pressurizer Relief Tank Rupture Disc Blew Out,Causing Ice Condenser Inlet Doors to Open.Caused by Pressure Fluctuations Resulting in Weakened Rupture Discs | /03L-0 on 790302:while Operating at Full Power, Pressurizer Relief Tank Rupture Disc Blew Out,Causing Ice Condenser Inlet Doors to Open.Caused by Pressure Fluctuations Resulting in Weakened Rupture Discs | |
| 05000316/LER-1979-015-03, /03L-0 on 790409:during Plant Startup,Small Crack & Pinhole Leak Found in Body of FMO-232,at Inlet Side of Valve Adjacent to Weld.Cause of Crack Not Determined. Radiographs of Area Reviewed | /03L-0 on 790409:during Plant Startup,Small Crack & Pinhole Leak Found in Body of FMO-232,at Inlet Side of Valve Adjacent to Weld.Cause of Crack Not Determined. Radiographs of Area Reviewed | |
| 05000315/LER-1979-016-03, /03L-0 on 790304:two Manual Containment Isolation Valves Were Inadvertantly Left Open Following Routine Sample of Instrument Room.Caused by Personnel Oversight.Both Valves Were Returned to Their Normally Closed Positions | /03L-0 on 790304:two Manual Containment Isolation Valves Were Inadvertantly Left Open Following Routine Sample of Instrument Room.Caused by Personnel Oversight.Both Valves Were Returned to Their Normally Closed Positions | |
| 05000316/LER-1979-016-03, /03L-0 on 790412:failure of Interlock,Which Prevents Opening Both Containment 650 Ft Level Airlock Doors.Caused by Slack in Actuator Cables & Weak Spring.One Cable & Spring Replaced | /03L-0 on 790412:failure of Interlock,Which Prevents Opening Both Containment 650 Ft Level Airlock Doors.Caused by Slack in Actuator Cables & Weak Spring.One Cable & Spring Replaced | |
| 05000315/LER-1979-017-03, /03L-0 on 790312:spent Fuel Pit Exhaust Ventilation Unit Flow Failed to Meet Acceptance Criteria. Caused by Slight Closing of Intake Grills Due to Sys Vibration.Grill Damper Linkage Securely Fastened | /03L-0 on 790312:spent Fuel Pit Exhaust Ventilation Unit Flow Failed to Meet Acceptance Criteria. Caused by Slight Closing of Intake Grills Due to Sys Vibration.Grill Damper Linkage Securely Fastened | |
| 05000316/LER-1979-017-03, /03L-0 on 790423:while Performing STP 022, Essential Svc water-142, Essential Svc Valve to 2 Cd Diesel Did Not Seat Properly.Caused by Excessive Wear of Split Disc Hinge Points.Stainless Steel Discs Were Substituted | /03L-0 on 790423:while Performing STP 022, Essential Svc water-142, Essential Svc Valve to 2 Cd Diesel Did Not Seat Properly.Caused by Excessive Wear of Split Disc Hinge Points.Stainless Steel Discs Were Substituted | |
| 05000316/LER-1979-017, Forwards LER 79-017/03L-0 | Forwards LER 79-017/03L-0 | |
| 05000315/LER-1979-018, Forwards LER 79-018/03L-0 | Forwards LER 79-018/03L-0 | |
| 05000316/LER-1979-018-03, /03L-0 on 790423:during Investigation of Periodic Alarms for Steam Generator High Steam Line Flow,Controller 2 Py 506B (Turbine Impulse Pressure) Was in Manual Control. Caused by Controller Not Being Returned to Automatic | /03L-0 on 790423:during Investigation of Periodic Alarms for Steam Generator High Steam Line Flow,Controller 2 Py 506B (Turbine Impulse Pressure) Was in Manual Control. Caused by Controller Not Being Returned to Automatic | |
