Eddy-Current Probe-Type Sodium Flowsensor for FFTF Reactor Fuel Channel Flow Monitoring

An eddy-current probe-type flowsensor is being developed for the FFTF to indicate sodium flow velocity at the outlet of a fuel channel in a temperature range of 300??F to 1200??F and a velocity range of 0-18 fps. Design considerations, out-of-reactor tests, both dry and in sodium, were performed and results are presented. Typical sensitivity of 0.6 mV rms/ft-sec has been obtained with excellent stability.