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| Issue date | Title | Topic | |
|---|---|---|---|
| ML19253A853 | 6 September 1979 | LER 79-089/03L-0:on 790811,single Failure Analysis Sys Channel 2 Containment Radiation Detector Re 2005 Spiked & Tripped Bistable.Re 2005 Declared Inoperable.Caused by Vibration in Area of Detector | |
| ML19254E195 | 25 October 1979 | LER 79-096/01T-0:on 791015,capacitor Failed in Integrated Control Sys Resulting in Unit Trip from 68.8% of Full Power. Caused by Blown Muffler on Generator Output 345 Kv Breakers. Damaged Mufflers Replaced & Offsite Power re-established | |
| ML19254E245 | 23 October 1979 | LER 79-095/03L-0:on 790925,auxiliary Feed Pump Turbine Steam Inlet Valve MS106 on Sys 1 Lost Its Indication.Caused by Loose Lamp Retainer Ring Which Grounded & Blew Control Power Fuse.Ring Was Tightened & Fuse Replaced | |
| ML19254F957 | 13 November 1979 | LER 79-101/03L-0:on 791017,safety Features Actuation Sys Channel 2 Radiation Detector Re 2005 Spiked Tripping Channel 2 Containment Radiation Bistable.Caused by Component Failure of Detector.Failed Detector Replaced | |
| ML19256A144 | 27 October 1978 | LER 78-100/03L-0:on 781001,during Surveillance Testing, Calculated Value for Unidentified RCS Leakage Exceeded 1 Gallon Per Minute Limit by 0.08 Gallons Per Minute.Caused by Increased Reactor Coolant Pump Seal Leakage | |
| ML19256A670 | 7 December 1978 | LER 78-114/03L-1 on 781110:borated Water Storage Tank Low Level Trip Setpoint Was Out of Tolerance (at 59.25 in H2O) on Safety Features Actuation Sys Channel 2.Caused by Instrument Drift of Bistable | |
| ML19256A693 | 2 January 1979 | LER 78-101/03L-0,supplemental Info Sheet:On 781005,Component Cooling Water Loop 1 Inoperable Due to Inoperability of Heat Exchanger Outlet Valve.Caused by Missing Nut on Actuator Linkage for Valve.Replaced Linkage Arm Bolt & Set Stroke | Stroke time |
| ML19256A696 | 4 January 1979 | LER 78-120/03L-0 on 781207:containment post-accident Radiation Monitors Re 5029 & 5030 Failed Due to Design Error.Ambient Temp Exceeded Limits & Caused Decomposition of Pump Motor Bearing Grease,Resulting in Bearing Seizure | Grab sample |
| ML19256A808 | 10 January 1979 | LER 78-123/01T-0 on 781228:about 2 Hours After Unit Entered Mode 4,containment Spray Pump Motor Breakers Had Not Been Racked In.Caused by Personnel Error Since Operator Involved Failed to Follow Written Procedure | |
| ML19256A864 | 11 January 1979 | LER 78-124/03L-0 on 781216:during Surveillance testing,13 of 18 Main Steam Safety Valves Failed to Be within +/-17 of Design Setpoint,Apparently Caused by Change in Ambient Conditions | |
| ML19256E989 | 9 November 1979 | LER 79-100/03L-0:on 791014,group 7,rod 7 Absolute Position Indication Showed Asymmetric W/O Clearing.Caused by Power Supply Cable.Cable Replaced W/High Temp Cable.Rebuilt Position Indicator Tube Installed | |
| ML19256G081 | 20 December 1979 | LER 79-114/03L-0:on 791122,RCS Indicated Flow Below Tech Spec Requirements.Cause Undetermined.Flow Transmitter Signal Output Circuits Operating Normally.Actual RCS Flow & Transmitter Calibr Will Be Checked & Tubing Backfilled | |
| ML19256G088 | 20 December 1979 | LER 79-115/03L-0:on 791122,remote Contact Data Typer Became Inoperable.Caused by Procedural Deficiency.Surveillance Requirements Inadequately Specified on Log Sheet.Log Sheet Will Be Modified to Specify Tech Spec Requirements | Fire Watch Hourly Fire Watch |
| ML19256G098 | 20 December 1979 | LER 79-116/03L-0:on 791123,Control Rod Group 5 Rod 11 Absolute Position Indication Declared Inoperable.Caused by Position Indication Assembly & Cabling Between Electrical Penetration & Rod.Investigation Continues | |
| ML19256G198 | 18 December 1979 | LER 79-113/03L-0:on 791121,hourly Surveillance Requirements Not Performed for 5.5-h While Incore Instrumentation Was Inoperable.Caused by Procedural Deficiency.Equipment Status Board Not Updated.Procedure Pp 1102.02 Revised | |
| ML19257A166 | 26 December 1979 | LER 79-120/03L-0:on 791129,numerous Asymmetric Alarms & Faults Received from Control Rod Group 7,rod 5.Caused by Failure of Reed Switch in Position Indication Assembly. Assembly Replaced & Adjusted | |
| ML19257A182 | 21 December 1979 | LER 79-119/03L-0:on 791203,post-accident Radiation Monitors Could Have Had High Setpoint for Release Set Higher than Allowed by Tech Specs.Caused by Procedural Deficiency. Procedure Mods Prepared | |
| ML19257A187 | 21 December 1979 | LER 79-117/03L-0: on 791126,dyring Routine Insp,Snubber on Decay Heat String Found Upside Down,Rendering Snubber Inoperable.Caused by Loose Jam Nut in Snubber Extension Piece Allowing Snubber to Rotate.Snubber Replaced | |
| ML19257A193 | 21 December 1979 | LER 79-118/03L-0:on 791126,after Low Level Alarm Received & Reactor Coolant Pump 1-2 Was Tripped,Flux Trip Setpoint Was Readjusted to Value Slightly in Excess of Tech Specs.Caused by Procedural Deficiencies.Mods Prepared | |
| ML19257A344 | 28 December 1979 | LER 79-121/03L-0:on 791130,while Moving Group 8 Rods,Rod 8-1 Was Noted Indicating 8% Lower than Group Average.Caused by Faulty Meter Movement.New Meter Installed | |
| ML19257A361 | 28 December 1979 | LER 79-122/03L-0:on 791201,reactor Protection Sys Channel 2 Thorium Indication Failed Low.During 791203 Investigation of Failure,Water Found in Termination Box.Caused by Failed Extension Piece on Resistance Temp Detectors | Pressure boundary leak |
| ML19257B308 | 8 January 1979 | LER 79-129/03L-0:on 791211,during Control Room Emergency Vent Sys 18-month Test ST 5076.02,charcoal Filter Bank in Unit 1-2 Failed to Meet Required Efficiency.Caused by Leak Between Filter Plate & Assembly.Plate Nuts Properly Torqued | |
| ML19257B338 | 9 January 1980 | LER 79-131/03L-0:on 791212,steam & Feedwater Rupture Control Sys Channel 4x15-volt Dc Power Supply PS-4 Failed.Caused by Overvoltage Trip Setpoint Actuating at Lower Value than Initial Adjustment.Installed New Power Supply | |
| ML19257B989 | 15 January 1980 | LER 79-133/03L-0:on 791219,calculations by Itt Grinnell Revealed Seismic Support Design High Pressure Injection Line Exceeded Slenderness Design Ratio.Caused by Failure to Correctly Evaluate Slenderness Ratio.Mods Completed 791223 | Earthquake |
| ML19257C490 | 24 January 1980 | LER 79-134/03L-0:on 791229,IBM Sys 7 Contact Data Logger in Control Room Had Not Printed Out in More than 24-h.Caused by Sys Being Locked Onto Invalid Door Alarm.Error Cleared, Program Reloaded & Operable | |
| ML19257D415 | 30 January 1980 | LER 80-002/03L-0:on 800103,after Actuating of Safety Features Actuation Sys Level 2,demin Water Valve DW68318 Did Not Indicate Closed & Monitor Light Did Not Indicate Properly.Caused by Maladjusted Position Indicator Switch | |
| ML19257D456 | 30 January 1980 | LER 80-003/03L-0:on 800103,during Auxiliary Feedwater Pump Test,Pump l-1 Was Declared Inoperable.Caused by Improperly Adjusted Slip Clutch Between Governor Manual Speed Adjustment Shaft & Remotely Controlled Speed Changer Motion | |
| ML19259B790 | 16 March 1979 | LER 79-029/01T-0 on 790306:during Valve Lineup,Auxiliary Operator Mistakenly Closed Borated Water Storage Tank Isolation Valves DH7A & DH7B.Caused by Personnel Error. Valves Opened Immediately | |
| ML19259B797 | 19 March 1979 | LER 79-031/03L-0 on 790219:two Computer Points Were Not Updating.Caused by Procedural Deficiency & Random Failures of Bailey Computer Sys.Surveillance Test Has Been Revised | |
| ML19259B798 | 7 December 1978 | LER 78-113/03L-1 on 781110:fluctuating Signals from Absolute Position Indicator for Control Rod 4 of Group 3 Caused Asymmetric Rod Alarms.Caused by Intermittent Failure of Position Indicator Tube.Tube Replaced | |
| ML19259D203 | 12 October 1979 | LER 79-093/03L-0:on 790917,output Relay Driver Lamp for Relay K303A in Steam & Feedwater Rupture Control Sys Channel 3 Was Extinguished.Caused by Inoperable Optical Isolator on Relay Driver Board.Failed Board Was Replaced | |
| ML19259D705 | 22 October 1979 | LER 79-094/03L-0:on 790924,boron Injection Flowpath Test Had Not Been Performed to Meet Surveillance Requirement. Caused by Personnel Error.Test Was Successfully Performed on 790925 | Boric Acid Shutdown Margin |
| ML19260B513 | 4 December 1979 | LER 79-107/03L-0:on 791105,unit Experienced Loss of Essential Instrumentation Distribution Panel Y2 & Did Not Enter Action Statement in Mode 5.Caused by Blown Preinverter YV2 Output Fuse.Repaired Inverter | |
| ML19260C354 | 21 November 1979 | Revised LER 79-105/01T-1:on 791109,during Review of IE Bulletin 79-21 Response,Noted Steam Generator Low Level Trip Setpoints to Steam & Feedwater Rupture Control Sys Channels 1 & 2 Were Below Tech Specs.Caused by Error in Points | |
| ML19260C375 | 18 December 1979 | LER 79-112/03L-0:on 791119,valve MS106 Failed to Open During Surveillance Testing.Caused by Improper Installation of Worm Gear Spacer.Drive Sleeve Machined & Worm Gear Spacer Reinstalled | |
| ML19260D037 | 4 February 1980 | LER 80-004/03L-0:on 800107,control Rod 5-11 Absolute Position Indication Declared Inoperable Due to Fluctuating Signals.Possibly Caused by Isolation of Position Indication Cabling & Electrical Penetration | |
| ML19260D559 | 7 February 1980 | LER 80-006/03L-0:on 800112,found Fiberglass Insulation Stuffed Into Open Wall Ventilator Between Water Treatment Bldg & Svc Water Valve Room,Causing Fire Damper to Be Inoperable.Figerglass Removed | Fire Watch |
| ML19260D996 | 6 February 1980 | LER 80-005/03L-0:on 800110,Tech Spec Late Date Passed W/O Performance of Boric Acid Flowpath Heat Tracing Weekly Test. Caused by Known Deficiency in Design of Sys Resulting in Inability to Maintain Min Temp Necessary During Startup | Boric Acid |
| ML19261B332 | 9 February 1979 | LER 79-010/03L-0:on 790112,Sys 7 Data Logger Experienced Core Dump,Voiding Computer Memory Bank Which Rendered Remote Monitoring of Fire Detection Sys Inoperable & Placed Unit in Action Statement of Tech Spec 3.3.3.8.Cause Unknown | Fire Watch |
| ML19263A859 | 27 December 1978 | LER 78-119/03L-0 on 781204:containment Radiation Monitor Re 2005 Was Declared Inoperable Because of Detector Module Component Failure.Module Replaced,Calibr,Tested & Declared Operable | |
| ML19263B920 | 19 January 1979 | LER 78-125/03L-0 on 781104:personnel Started Reactor Coolant Pump 1-1-2 Instead of 1-1-1 Causing Loss of Power of Essential Bus D1.Caused by Personnel Error & Design Deficiencies.Facility Change Requests Prepared | |
| ML19263C042 | 26 January 1979 | LER 78-127/03L-0 on 781230:asymmetric Rod Indication Was Received for Control Rod 4 of Group 5;unit Was in Mode 2 & Absolute Position Indicator for Rod 4 Was Inoperable.Caused by Dirty Module Contacts | |
| ML19263C053 | 26 January 1979 | LER 78-126/03L-0 on 781230:during Startup of Component Cooling Water Pump,Heat Exchanger 1-1 Svc Water Outlet Valve SW-1424 Would Not Open Due to Slippage & Misalignment of Valve Linkage;Led to Continuous Valve Oscillation | |
| ML19263D345 | 26 February 1979 | LER 79-017/03L-1:on 790130,photoelectric Smoke Detector Ds 8605-E in Emergency Control Generator 1-1 Area Not Functional During Surveillance Testing.Caused by Detector Failure.Fire Watch Patrol Maintained in Area | Fire Watch |
| ML19263D383 | 23 March 1979 | LER 79-034/01T-0 on 790103:HPI Pump 1-1 Was Stopped Due to Low Recirculation Flow Indication.Caused by Inability of Heat Trace to Maintain HPI Pump Recirculation Line Temp Above Freezing.Heat Increased | |
| ML19269C728 | 5 February 1979 | LER 79-008/03L-0 on 790109:during Surveillance Testing, Containment Recirculation Fan 1-1 Failed to Run.Cause Attributed to Buildup of non-conductive Film on Auxiliary Controller Contacts | |
| ML19269C877 | 12 February 1979 | LER 79-014/03L-0:on 790116,during Shutdown,Boric Acid Addition Tanks (Baat) Total Vol 3-1/3% Below Tech Spec 3.1.2.9 Requirements.Caused by Reduced Baat Vol After Completion of Required Testing Followed by RCS Boration | Boric Acid Shutdown Margin |
| ML19269C946 | 12 February 1979 | LER 79-013/03L-0:on 790116,when Makeup Pump 1 Started for Surveillance testing,1/2 Inch Nipple at Discharge of Attached Gear Driven Lube Oil Pump Failed,Resulting in Oil Spray Which Required Pump Shutdown | |
| ML19269D167 | 20 February 1979 | LER 79-016/03L-0:on 790124,emergency Lock Failed Leak Rate Test While Unit in Mode 5.Caused by Loosening of Shaft Seal (Teflon Packing) Due to Routine Use of Escape Lock.Packing Will Be Replaced During Next Convenient Outage | |
| ML19269D551 | 29 May 1979 | LER 79-056/03L-0 on 790501:excesssive Leakage Found Through Containment Isolation Valve NN236.Caused by Either Dirt on Valve Seating Surface or Slipped Actuator Linkage.Valve Cleaned & Recalibr |