Few-Group Library of Neutronic Constants for Fast Calculations

A tool for forming a few-group library of neutronic constants in the ANISN format based on the BNAB-RF system of constants is described. The library contains a collection of data required for calculating neutron and γ-, energy-release, and other fields. The library contains data for most elements of Mendeleev's table and their isotopes at different temperature and different content in the material (dilution cross section). A variant of the library with a 26-group structure for comparing the time indices with conventional systems is examined. The systems of neutronic constants consist of libraries and computer codes for preparing macro constants. The code using the few-group library does not contain the conventional interpolation on temperature and dilution cross section, which makes it possible to decrease the preparation time of the constants with almost no loss of accuracy. A comparison of the time characteristics of constants preparation using conventional systems shows the advantage of the new system.