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| Issue date | Title | Topic | |
|---|---|---|---|
| ML17317A803 | 12 December 1978 | LER#78-090/01T-0 on 781121:w/RHR in Oper,Leakage Was Noted from Some Upper Containment Spray Nozzles,Caused by Check Valves CTS-127E & CTS-127W Being Installed Backwards | |
| ML17317A810 | 4 December 1978 | Monthly Oper Rept for Nov 1978 | Boric Acid |
| ML17317A813 | 4 December 1978 | Monthly Oper Rept for Nov 1978 | |
| ML17317A821 | 20 December 1978 | LER#78-063/03L-0 on 781128:aux Feed Throttle from Mdafp to #3S/G Position Indication Was Intermittent;Valve Would Not Close Electrically.Caused by Broken Lead Between Terminal #43 & #57 on Aux Switch of Limitorque SMB-0-25 Operator | |
| ML17317A824 | 20 December 1978 | LER#78-091/03L-0 on 781125:source Range Neutron Flux Channel N-31 Inoperable.Caused by Unclean Connectors on High Voltage Cable & Signal Cable at Prcamp | |
| ML17317A825 | 20 December 1978 | LER#78-092/03L-0 on 781125:reactor Coolant Average Temp on 2 of 4 Loops Below Tech Specs of 541F,resulting in P-12 Permissive Being Actuated.Caused by Turbine Test W/Minimum Steam Dump,Increase Steam Flow Caused Temp Drop | |
| ML17317A826 | 20 December 1978 | LER#78-093/03L-0 on 781125:rod Position Indication(Rpi)For Control Rod H-8 Exceeded 12 Step Limit.Caused by H-8 Drift | |
| ML17317A827 | 20 December 1978 | LER#78-094/03L-0 on 781202:halon Sys for Cable Spreading Area Was Discharged & Therefore Inoperable.Caused by Operator Error | |
| ML17317A828 | 20 December 1978 | LER#78-095/03L-0 on 781206:while Decreasing Turbine Load, Reactor Coolant Average Temp Exceeded 576.2 F.Caused by Faulty Drain Valves on 5-A Heater,Creating Unstable Feedwater Control & Turbine Load | |
| ML17317A829 | 20 December 1978 | LER#78-096/03L-0 on 781209:during Rapid Load Reduction from 100% to 88%,axial Flux Difference Went Outside Target Band. Air Leak on a Condenser Vacuum Breaker Caused Increase in Back Pressure on Main Condenser | |
| ML17317A830 | 20 December 1978 | LER#78-097/03L-0 on 781209:during Rapid Pwr Reduction from 100% to 88%,pwr Pressurizer Pressure Reduced Below Tech Spec Limit of 2220psia.Caused by Rapid Pwr Reduction Because of Decreasing Vacuum on Main Turbine/Generator | |
| ML17317A831 | 20 December 1978 | LER#78-098/03L-0 on 781010:axial Flux Difference(Afd) Monitoring Alarm Point Was Discovered to Be Set at 103% Vice 84%.Caused by Afd Alarm Trip Point Being Raised for Testing Purposes & Not Returned to Correct Point | |
| ML17317A846 | 28 December 1978 | LER 78-099/03L-0 on 781212:pressurizer Pressure Was Reduced to 2215 Psia,Caused by Trip of Circuit Breaker Controlling Instrument Air to Containment.Loss of Air Closed Letdown Valves,Left No Air to Open Spray Valves | |
| ML17317A861 | 29 December 1978 | LER 78-100/01T-0 on 781217:containment APD(R-11)ran Out of Filter Paper & Caused High Flow Condition.Sample Pump Tripped,Rendered Containment Gaseous Monitoring Sys Inoperable.Caused by Need for Filter Paper in Sample Pump | |
| ML17317A864 | 5 January 1979 | LER 78-101/01T-0 on 781223:both Control Room Pressurization Fans Were Inoperable.Caused by Water Seepage Into a Fire Protection Sys Switch,Resulting in Actuation of Fire Spray Sys & Lockout of the Fans | Boric Acid Safe Shutdown Earthquake Coatings Nondestructive Examination Overtravel Inattentive |
| ML17317A870 | 9 January 1979 | LER 78-064/03L-0 on 781214:during Surveillance Noted That Position of Rod M-8 Was Greater than Allowable 12 Step Limit.Caused by Maladjustment of Variable Shunt Resistor Contained in Control Board Indicator for Rod M-8 | |
| ML17317A874 | 3 January 1979 | Monthly Operating Rept for Dec 1978 | |
| ML17317A877 | 3 January 1979 | Monthly Operating Rept for Dec 1978 | |
| ML17317A881 | 16 January 1979 | LER 78-023/03X-1 on 780312:during Containment Air Lock Leakage Test on 650 Foot Elevation Inner Door,Door Seal Leakage Rate Exceeded Tech Spec Limit,Caused by Paint Chips on Rubber Seal Which Obstructed Proper Seal on Door | |
| ML17317A884 | 16 January 1979 | LER 78-038/03X-1 on 780623:while in Mode 2,position of Rods C-3,C-13,N-13,H-6,F-8 & K-8 Indicated Deviation of Greater than 12 Steps from Demand Position.Caused by Signal Conditioning Modules | |
| ML17317A886 | 16 January 1979 | LER 78-042/03X-1 on 780710:during Startup Testing,Flux Map Measurement Was Not Processed During Specified Time Limit. Though Flux Map Was Obtained,It Was Not Processed Due to Change in Manpower Requirements | |
| ML17317A887 | 16 January 1979 | LER 78-065/03L-0 on 781229:indication for Pressurizer Level Channel 2 Deviated Approx 5% from Other 2 Channels.Caused by Gas Pocket in Sensing Line | |
| ML17317A888 | 16 January 1979 | LER 78-066/03L-0 on 781229:during Routine Startup,Rod Position Indication for Rods F-4,D-6 & K-6 Exceeded 12 Step Limit of Tech Specs.Caused by Drift of Signal Conditioning Modules | |
| ML17317A899 | 19 January 1979 | LER 78-022/03X-1 on 780407:during Normal Operation,Position Indication for Rods D-12 & H-8 Exceeded +/- 12 Step Limit of Tech Specs.Outputs of Amplifiers That Feed Control Board Indicators Found to Be Incorrect | |
| ML17317A901 | 19 January 1979 | LER 78-031/03X-1 on 780507:during Normal Operation Between 780507 & 780519 RPI Did Not Meet +/- 12 Step Limit of Tech Specs 22 Times.Caused by Recessed Pins in Connector | |
| ML17317A904 | 19 January 1979 | LER 78-067/03L-0 on 781223:during Routine Surveillance Test on Solid State Protection Sys,Several Logic Functions in Train B Tested Unsatisfactorily.Test Card(Model 6056033G01) Had Failed & Was Replaced | |
| ML17317A905 | 19 January 1979 | LER 78-068/03L-0 on 781221:during Rapid Power Reduction from 100% to 74% Axial Flux Difference Was Forced Outside Target Band Specified by Tech Specs.Inadvertent Feed Pump Turbine Trip Necessitated Load Reduction to Prevent Trip | |
| ML17317A913 | 31 January 1979 | LER 79-001/03L-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 | |
| ML17317A925 | 5 February 1979 | LER 79-002/03L-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 | |
| ML17317A926 | 5 February 1979 | LER 79-003/03L-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 | |
| ML17317A930 | 9 February 1979 | LER 79-001/03L-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 | |
| ML17317A936 | 2 February 1979 | Monthly Operating Rept for Jan 1979 | Boric Acid High winds |
| ML17317A940 | 12 February 1979 | Monthly Operating Rept for Jan 1979 | Hydrostatic |
| ML17317A943 | 13 February 1979 | LER 79-004/01T-0 on 780802:turbine Low Fluid Oil Pressure Switches Set at non-conservative Value.Initially Calibr at Vendor'S Recommended Setpoints;Were Not Recalibr Per Tech Specs | |
| ML17317A944 | 13 February 1979 | LER 79-005/03L-0 on 790117:solid State Protection Sys Tested Unsatisfactorily.Caused by Failure of Universal Logic Card A-214 | |
| ML17317A945 | 13 February 1979 | LER 79-006/03L-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 | |
| ML17317A948 | 12 February 1979 | LER 79-002/03L-0 on 790112:following Boric Acid Injection, Axial Flux Difference Exceeded Tech Spec Limit.Cause Unknown | Boric Acid |
| ML17317A959 | 27 February 1979 | LER 78-069/03L-0 on 781010:axial Flux Difference Monitoring Alarm Point Discovered Set Above Tech Spec Max.Caused by Raising of Alarm Trip Point During Preoperational Test Failure to Return to Required Value at End | |
| ML17317A960 | 27 February 1979 | LER 79-003/03L-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 | |
| ML17317A962 | 28 February 1979 | LER 79-004/03L-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 | |
| ML17317A984 | 7 March 1979 | LER 79-005/03L-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 | |
| ML17317A985 | 7 March 1979 | LER 79-006/03L-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 | |
| ML17317B001 | 13 March 1979 | LER 79-007/03L-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 | |
| ML17317B005 | 13 March 1979 | LER 79-007/03L-0 on 790218:suction Valve of West Centrifugal Charging Pump Found Closed.Caused by Mistaken Closing Following Surveillance Testing.Incident Is Being Reviewed | |
| ML17317B006 | 13 March 1979 | LER 79-008/03L-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 | |
| ML17317B007 | 13 March 1979 | LER 79-009/03L-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 | |
| ML17317B011 | 1 March 1979 | Monthly Operating Rept for Feb 1979 | |
| ML17317B014 | 1 March 1979 | Monthly Operating Rept for Feb 1979 | |
| ML17317B030 | 20 March 1979 | LER 79-010/03L-0 on 790203:diesel Essential Svc Water Check Valves 1-ESW-111 & 1-ESW-114 Did Not Function Properly. Caused by Excessive Wear at Split Disc Hinge Points.Discs Replaced & Maintenance Insp Procedures Revised | |
| ML17317B031 | 20 March 1979 | LER 79-011/03L-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 |