ANS 19.3-2022 PDF

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 fuel is not within the scope of this standard