American National Standard: for the determination of neutron reaction rate distributions and reactivity of nuclear reactors

This standard provides guidance for performing and validating the sequence of calculations leading to prediction, in all types of nuclear reactors of: reaction rate spatial distributions, reactivity, and change of isotopic compositions with time. The standard provides: guidance for the selection of computational methods, criteria for verification of calculational methods used by reactor core analysts, criteria for evaluation of accuracy and range of applicability of data and methods, and requirements for documentation of the preceding