scope:

This standard¹⁾ 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 is not within the scope of this standard.

¹⁾ The current standard, ANSI/ANS-19.3-2022, is hereinafter referred to as "this standard."