The optimization of a nuclear converter core in respect of thermal power, power peaking and fuel conversion ratio is studied from the aspect of neutron flux distribution. It is shown that flatten-ing the neutron flux distribution maximizes the thermal power output. A mathematical approach to the problem of flattening the neutron flux distribution is presented for a regionized reactor. Minimiza-tion of power peaking at the border of the region of flattened flux is considered with one- and two-group approximations. The analyses on one dimensional model has led to the result that the optimal reactor should be three-regional.
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