Development of an In-Core Permanent-Magnet Probe-Type Sodium Flowsensor for Operation in the Fast Flux Test Facility (FFTF)

A permanent-magnet, probe-type sodium flowsensor small enough to be inserted and removed through curved instrumentation guide tubes and positioned above fuel assembly outlet coolant channels in the FFTF has been developed and tested in out-of-pile dynamic sodium loops. Design and construction features, test results, and improved design considerations, are presented.