ANS 19.3:2011 (R2017)

This standard provides guidance for performing and validating the sequence of steady-state calculations leading to prediction in all types of operating commercial nuclear reactors of the following: 1) reaction-rate spatial distributions; 2) reactivity; 3) change of nuclide compositions with time. The standard provides the following: 1) guidance for the selection of computational methods; 2) criteria for verification and validation of calculation methods used by reactor core analysts; 3) criteria for evaluation of accuracy and range of applicability of data and methods; 4) requirements for documentation of the preceding. Note that the use of mixed uranium-plutonium oxide (MOX) fuel has been taken as out of scope for this revision of the standard. It will be taken into account in the next revision.