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| Issue date | Title | Topic | |
|---|---|---|---|
| ML20040H484 | 10 February 1982 | Ro:On 820111,automatic Starter Circuit Failed to Start Emergency Generator on Loss of Site Electrical Power.Caused by Inability of Generator Choke to Compensate for Lower Ambient Temp Due to Extreme Cold Weather | |
| ML20009D528 | 29 June 1981 | Ro:On 810601,during Semiannual Compliance Check,Low Flow Scram Set Point on Pool Coolant Flow Instrument 921B Was Below Tech Specs.Scram Trip Unit Replaced & Compliance Check Performed | |
| ML20004B903 | 26 May 1981 | Ro:On 810518,pressurizer High Pressure Scram Switch 939 Was Found Isolated.Caused by Failure to Reopen Valve 599B After Insp.Valve 599B Reopened & High Pressure Scram Protection Restored | |
| ML20004B030 | 18 May 1981 | Ro:On 810420,meter Control Relay Unit Scram Did Not Actuate in Response to Low Pressure Signal.Caused by Reduced Capacitance Value Preventing Capacitor from Charging Sufficiently.New Meter Relay Control Unit Installed | |
| ML20003D676 | 20 March 1981 | Ro:On 810223,w/reactor Shutdown for Scheduled Maint, Isolation Valve for Containment Bldg Leak Rate Determination Sys Found in Open Position.Cause Not Stated.Valve Lineup on Containment Leak Rate Sys Conducted.Pipe Cap Installed | |
| ML19350B969 | 17 March 1981 | Ro:On 810223,isolation Valve V546B Failed to Move to Fully Opened Position Following Normal Shutdown.Caused by Difficulty in Movement of Valve Actuator.Valve Rebuilt, Lubricated & Reinstalled | |
| ML20003C838 | 13 March 1981 | Ro:On 810213,while Performing Reactor Startup,Nuclear Instrumentation Channel 3 Failed to Respond Positively to Changes in Reactor Subcritical Multiplication.Caused by Faulty Cable Installation.Cables Were Properly Connected | |
| ML20003B263 | 5 February 1981 | Ro:On 810109 & 10,reactor Operated W/Low Air Flow Through Stack Radiation Monitor.Caused by Associated Air Blower in Secured Position.Blower Turned on When Found Secured.Stack Monitor Filters Pulled & Counted | |
| ML19331D960 | 29 August 1980 | Ro:On 800829,primary Inlet Isolation Valve 507B Failure to Shut When Securing Primary Sys Following Shutdown.Caused by Separation of Lower Seat from Metal Insert in Schrader Valve & Consequent Blockage of Exhaust Port | |
| ML19331D957 | 29 August 1980 | Ro:On 800803,entire Holding Tank Failed to Meet Primary Tech Specs.Caused by Inadvertent Entry of Approx 400 Gallons of Water Failing to Meet Primary Specs.Holdup Tank Drained & Water Meeting Primary Specs Returned to Tank | |
| ML19320B495 | 7 July 1980 | Ro:On 800616,while Verifying Sample Loading of triple-tubed Sample Irradiated Facility Located in Ctr Test Hole,One Tube Was Found Missing 2-inch Long Spacer.No Unreviewed Safety Question Existed During Period of Operation | |
| ML19318D252 | 4 June 1980 | Ro:On 800516,automatic Regulating Blade Drive Mechanism Failed.Caused by Worn Spot on Drive Gear.Gear Drive Assembly Replaced & Blade Cycled Through Full Travel to Assure Proper Operation | |
| ML19310A303 | 4 June 1980 | Ro:On 800516,w/reactor Operating at Full Power in Automatic Mode,Automatic Regulating Blade Drive Mechanism Was Discovered Producing Grinding Noise.Caused by Worn Spot on Drive Gear.Regulating Blade Gear Drive Was Replaced | |
| ML19310A363 | 2 June 1980 | Ro:On 800509,emergency Generator Failed to Start When Starting Sequence Was Initiated by Automatic Weekly Exerciser.Caused by Tripped Starter Motor.Generator Inspected & Retested W/New Starter Motor | |
| ML19257D509 | 22 January 1980 | Ro:On 791227,while Operating at Steady State Power Level, Fuse for Power Supply 2PS6 Was Removed.Reinstallation of Fuse Caused Reactor Scram from Temp Sensors 980A & 980B. Caused by Electrical Transient.Operator Admonished | |
| ML19275A242 | 27 September 1979 | Ro:On 790827,during Monthly Load Test,Emergency Generator Failed to Start.Cause Probably Due to Insufficient Fuel in Day Tank.Generator Inspected & Satisfactorily Retested | |
| ML19331D962 | 20 June 1975 | Ro:On 750620,investigation of Schrader 9725 Series three- Way Solenoid Valve Indicated Valve Could Fail If Lower Seal Separated from Metal Insert & Prevent Air from Being Exhausted.Mfg Confirmed Problem Through Testing | Loctite |