Three Dimensional Multigroup Diffusion Theory Codes VANITA and TRIPHEX Based on the Method of Variational Calculus

摘要

Two three-dimensional multigroup diffusion theory codes VANITA and TRIPHEX, the first one for rectangular and the next for hexagonal geometry have been developed based on variational methods to carry out calculations in any type of reactor system. The method consists of deriving a system of stationary conditions on suitable functionals for each neutron group in the multigroup treatment. Sample calculations compared with those obtained using codes based on finite difference methods such as 3DB, ALCIALMI, PDQ-7 and REVE, show that the present variational method is much faster than the standard finite difference method. (Atomindex citation 12:597159)