TREAT Fast-Neutron Hodoscope: Improvements in Time and Mass Resolution of Fuel Motion
The fast-neutron hodoscope at the Transient Reactor Test Facility detects fuel motion in thick opaque capsules during in-core destructive transient tests. Counts from several hundred detectors, each with rates up to a megahertz, are collected at intervals as short as a millisecond for up to tens of seconds. The large amount of data must be decoded, normalized, represented in suitable forms, and analyzed. A computer-controlled magnetic disk data acquisition system has been installed which provides shorter data collection intervals, simplifies decoding, and permits immediate data analysis. Data normalizations and representations have been developed which significantly increase the dynamic range, yield sensitive quantitative indications of fuel mass motion, and render the data intuitively comprehensible. The improved hodoscope system performance level is demonstrated by results from a recent transient test, Pinex-2, which show the quantitative evolution of fuel mass motion from 1515 MW peak reactor power through a 1 MW post-scram radiation level.
[170,i 70]SIC.FA? RSXH26C76 19-MAR-S2 10:51:04 V63 L54 IMPROVEMENTS IN TREAT HODOSCOPE FUEL-MOTION CAPABILITIES*
The fast—neutron detection systerc of the hodoscope has been a najor ingredient in the success of the hodoscope as a fuel-rotion monitoring device. VJhile the original Horr.yak-button detector systen has net most of the current fuel-rcotion needs, the wore stringent requirements of improved reactor-safety codes, and of new experimental tost facilities necessitate improved detection capabilities. Development efforts have centered on three areas: the construction of an array of proton-recoil proportional counters to be used in conjunction with the Hornyak-button detectors, the upgrading of the Hornyalc-button detectors to increase linearity and signal—tobackground ratio, and the intercaiibration of detectors usir>5» a modified horizontal and a new vertical scan r,ystem.
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