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| Issue date | Title | Topic | |
|---|---|---|---|
| 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 | |
| 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 | |
| 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 | |
| ML17317B032 | 20 March 1979 | LER 79-012/03L-0 on 790226:containment Air Monitor Pump Overheated.Caused by Worn Rubber Spider in Lovejoy L-100 Coupling.Spider Replaced & Air Sampler Retested | |
| ML17317B033 | 20 March 1979 | LER 79-013/03L-0 on 790303:auxiliary Feed Valve FMO-212 Would Not Shut from Control Room.Caused by Broken Wire in Valve'S Motor Operator.Breakage Is a Result of Vibration & Use of Solid Conductor Wire.Wire Replaced | |
| ML17317B046 | 28 March 1979 | LER 79-008/03L-0 on 790303:main Turbine Stop Valve C Closure Limit Switch Failed Conservatively (Closure Indication Received).Cause Unknown.Switch Replaced | |
| ML17317B049 | 28 March 1979 | LER 79-014/03L-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 | |
| ML17317B050 | 28 March 1979 | LER 79-015/03L-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 | |
| ML17317B063 | 2 April 1979 | LER 79-009/03L-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 | |
| ML17317B066 | 3 April 1979 | LER 79-010/03L-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 | |
| ML17317B069 | 3 April 1979 | LER 79-016/03L-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 | |
| ML17317B070 | 3 April 1979 | LER 79-017/03L-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 | |
| ML17317B086 | 9 April 1979 | LER 79-018/03L-0 on 790310:root Valve for Lower Containment Pressure Transmitter PPP-300 Was Found in Closed Position. Cause Unknown.Valve Was Immediately Opened,Restoring Loop to Operable Status | |
| ML17317B112 | 17 April 1979 | LER 79-020/03L-O on 790323:pressurizer Relief Tank Rupture Disk Blew Out While in Mode 3.Caused by Repeated Pressure Fluctuations Causing Rupture Disk to Weaken.Corrective Action Unnecessary Since Doors Functioned as Designed | |
| ML17317B114 | 17 April 1979 | LER 79-021/03L-0 on 790327:pressure in RCS Was Found Below Tech Spec Limit While in Mode 1.Caused by Operator Inadvertantly Opening Auxiliary Spray Valve to Pressurizer QRV-51.Valve Closed Upon Discovery | |
| ML17317B118 | 17 April 1979 | LER 79-011/03L-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 | |
| ML17317B138 | 24 April 1979 | LER 79-023/03L-0 on 790326:portion of Circuitry for Rod K-10 Indication Was Shorted Rendering Channel Inoperable.Caused by Shorting Secondary Coil Voltage Terminals to Line Voltage Terminals at Rear of Indicator Panel.Measurement Revised | |
| ML17317B139 | 24 April 1979 | LER 79-024/03L-0 on 790326:indicated Position for Rod F-6 Exceeded Twelve Step Limit Imposed by Tech Specs, & Problem Recurred Four More Times in Two Days.Investigation in Progress & Suppl Rept Will Be Submitted | |
| ML17317B153 | 27 April 1979 | LER 79-012/03L-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 | |
| ML17317B161 | 2 May 1979 | LER 79-013/03L-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 | |
| ML17317B162 | 27 May 1979 | LER 79-014/03L-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 | |
| ML17317B166 | 2 May 1979 | LER 79-026/03L-0 on 790406:during Normal operation,69/4kV Offsite Ac Electrical Supply Became Inoperable.Caused by High Winds During Severe Windstorm.Damaged Jumper Replaced & Sys Returned to Operable Status | High winds |
| ML17317B167 | 2 May 1979 | LER 79-025/03L-0 on 790416:time Response Data Not Collected During Apr 1976 Refueling Outage for Low Steam Pressure Engineered Safety Feature Channel.Caused by Inadvertent Procedural Omission.Checklist Will Be Used in Future | |
| ML17317B171 | 7 May 1979 | LER 79-010/03X-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 | |
| ML17317B185 | 9 May 1979 | LER 79-019/03L-0 on 790413:while Performing Hydraulic Snubber Surveillance Insp,Snubbers GBD-S573 & GBD-S574 Found W/Drained Reserviors.Caused by Loose Pipe Unions Between Snubbers & Remote Reservoirs.Snubbers Replaced | |
| ML17317B186 | 9 May 1979 | LER 79-027/03L-0 on 790416:during Refueling W/Emergency Diesel Generator AB inoperable,600 Volt Bus 11D Made Inoperable by Removal of Normal Feed Breaker T1112 for Cleaning.Caused by Personnel Error.Operators Reinstructed | |
| ML17317B187 | 9 May 1979 | LER 79-028/03L-0 on 790410:torque Required to Open Lower Ice Condenser Inlet Door 3-R Exceeded Tech Specs.Caused by Sheet Metal Screws Loose at Bottom of Door.Door Frame Edge Depressed | |
| ML17317B190 | 9 May 1979 | LER 79-015/03L-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 | Hydrostatic |
| ML17317B191 | 9 May 1979 | LER 79-016/03L-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 | |
| ML17317B207 | 14 May 1979 | LER 79-029/03L-0 on 790414:cracks Discovered in Divider Barrier Seal.Caused by Excessive Compression of Seal Matl by Steel Plates.Work in Progress to Replace Cracked Sections | |
| ML17317B210 | 16 May 1979 | LER 79-030/03L-0 on 790417:while Performing Routine Surveillance Test on AB Diesel Generator,Load Conservation Circuitry Did Not Fully Function as Design.Cause Under Investigation | |
| ML17317B211 | 16 May 1979 | LER 79-031/03L-0 on 790419:during Routine Channel Calibr, Bistable Trip Value Discovered Nonconservative W/Respect to Tech Spec Limits.Caused by Excess Drift.Bistable Will Be Repaired | |
| ML17317B212 | 16 May 1979 | LER 79-032/03L-0 on 790416:during Routine Channel Calibr, Bistable FB-510B Trip Point Was Nonconservative W/Respect to Tech Spec Limit.Caused by Excess Drift.Bistable Recalibr | |
| ML17317B215 | 16 May 1979 | LER 79-017/03L-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 | |
| ML17317B241 | 23 May 1979 | LER 79-018/03L-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 | |
| ML17317B254 | 4 June 1979 | LER 79-033/03L-0 on 790308:monthly Functional Tests for Containment Area Monitor,Containment atmosphere-particulate & Containment atmosphere-gaseous Monitors Were Not Performed.Caused by Daily Assignment Error |