THERMAL AND TOTAL EPITHERMAL NEUTRON FLUX DISTRIBUTIONS IN THE EXPERIMENTAL GAS COOLED REACTOR

The thermal and total epithermal neutron flux distributions in the EGCR from the center of the core through the biological shield were calculated. The maximum values of the flux distribution are presented in graph form. Ordinary concrete was found to permit a thermal flux buildup, similar to that found in the graphite reflector. In heavy concrete there was no such buildup seen, since the thermal flux is attenuated through the complete shield. A Val Prod code using multigroup diffusion theory was used to calculate the neutron flux distributions. Calculations are shown. (M.C.G.