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 Issue dateTitleTopic
ML20057C42222 September 1993Ro:On 930910,noticed Fluctuations on Power Channels Due to Element 574 in Position J-7 Becoming Unlatched for Listed Reasons.Subj Element Replaced.Special Instructions Will Be Provided to Operators on Fuel Handling & Monitoring
ML20114D7112 September 1992Ro:On 920824,several Annunicators Re Reactor in Manual, Servo Deviation Greater than 10% & Clutch Power Off Received.Caused by Shim 3 Slipping & Clutch Current on Low Alarm.Potentiometer Wiped Clean & Current Adjusted
ML20059M14925 September 1990Special Rept,On 900918:shim 1 Relay Failed to Release Completely Upon Manual Scram.Caused by mercury-wetted- Contact Relay in Manual Scram Circuit of Shim.Relay Replaced & Relays in Sys Checked & Found to Operate Normally
ML20235M47123 September 1987Ro:On 870911,while Performing Shim Arm Calibr Tests at Low Power,Shim 1 Would Not Drive Out But Would Drive In.Caused by Worn Thrust Bearings on Drive.Drive Reinstalled & Tested Satisfactorily
ML20087N61229 March 1984Ro:On 840319,following Shim Arm Calibr Test,Shift Arm 1 Did Not Fall.Cause Unknown.New Ball Nut & Screw Assembly Installed
ML20067D9396 December 1982Ro:On 821126,during Routine Refueling Operations,Fuel Element 345 Fell to Upper Grid in Transfer from Core Position D-1 to D-7.Caused by Operating Difficulty in E-2 Transfer Arm.Element Removed & Seated