The Fast Neutron Hodoscope at Treat: Operational Experience and Improvementsx

The multichannel hodoscope at TREAT is capable of detecting motion of fuel resulting from intentional meltdown of fuel pins contained within a test capsule. The system has been in operation in its present form since 1969, having participated in over 50 transients. Operational experience and evolutionary improvements are the subject matter of this report. The rather complex hodoscope system, which is supported by an involved series of steps before results can be achieved, has worked well within design prediction. Computer-aided reconstruction of the data has been provided to obtain displays, plots, and movies of fuel motion events.