Abstract
In this investigation a quick and accurate method of calculating dose rates outside the primary shield of a nuclear reactor is developed. This method is then used to investigate minimum weight reactor shield configurations. The fast neutron dose at the outside of the shield is obtained by using the removal cross section concept. The thermal neutron distribution in the shield is obtained from the two group diffusion equations using fermi age theory for the slowing down of the fast neutrons. The primary and secondary gamma rays are treated by transmission matrix techniques. The optimization is carried out by determining the weight of various primary shield configurations and then searching for a minimum weight. Studies are conducted on iron-water slab shields and lead-water slab shields.
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