A Regional Neutron-Balance Method for Multi-Group Calculation of Multi-Region Fast Reactors

A simple and quick method is proposed for one-dimensional multi-group calculations of multi-region fast reactors. This method is based on the condition of neutron-balance in each of the regions or subregions. Neutron flux distributions are represented by the simplest functions.

It has been proved by a series of test computations that the accuracy is comparable to the ordinary diffusion theory calculations, while the computing time is saved by a factor of ten.