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NRC proposes changes to its rules on nuclear materials
In response to Executive Order 14300, “Ordering the Reform of the Nuclear Regulatory Commission,” the NRC is proposing sweeping changes to its rules governing the use of nuclear materials that are widely used in industry, medicine, and research. The changes would amend NRC regulations for the licensing of nuclear byproduct material, some source material, and some special nuclear material.
As published in the May 18 Federal Register, the NRC is seeking public comment on this proposed rule and draft interim guidance until July 2.
Mihailo I. Marković, Djordje M. Minć, Aleksandar D. Rakić
Nuclear Science and Engineering | Volume 110 | Number 2 | February 1992 | Pages 157-164
Technical Papers | doi.org/10.13182/NSE92-A23884
Articles are hosted by Taylor and Francis Online.
Exactly describing the time of thermal neutron collisions with water molecules, orientation averaging is performed by an exact method (EOAK) and four approximate methods (two well known and two less known). Expressions for the microscopic scattering kernel are developed. The two well-known approximate orientation averaging methods are Krieger-Nelkin (K-N) and Koppel-Young (K-Y). The results obtained by one of the two proposed approximate orientation averaging methods agree best with the corresponding results obtained by EOAK. The largest discrepancies between the EOAK results and the results of the approximate methods are obtained using the well-known K-N approximate orientation averaging method.
