Comments requested on two standards

摘要

Comments are requested on the following standards by June 14, 2011: ■ ANS-19.3-201 x, Steady-State Neutron-ics Methods for Power Reactor Analysis (revision of ANSI/ANS-19.3-2005). This standard provides guidance for performing and validating the sequence of steady-state calculations leading to the prediction, in all types of operating commercial nuclear reactors, of (1) reaction-rate spatial distributions, (2) reactivity, and (3) change of nuclide compositions with time. The standard provides (1) guidance for the selection of computational methods, (2) criteria for the verification and validation of calculation methods used by reactor core analysts, (3) criteria for the evaluation of accuracy and range of applicability of data and methods, and (4) requirements for the documentation of the preceding.