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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.
Weston M. Stacey, Jr.
Nuclear Science and Engineering | Volume 44 | Number 2 | May 1971 | Pages 194-203
Technical Paper | doi.org/10.13182/NSE71-A19668
Articles are hosted by Taylor and Francis Online.
The effect of anisotropic (CM) elastic scattering upon neutron moderation has been investigated. Relations between the Legendre moments of the angular scattering data (CM) and the moderating parameters of the Greuling-Goertzel (GG) and improved (IGG) theories are given, and it is shown theoretically and numerically that only the first few Legendre moments contribute significantly to the moderating parameters of the P0 (lab) theory. In general, anisotropic scattering is shown to reduce dramatically the moderating effectiveness of a material, and to produce oscillations (in energy) in the neutron flux. Numerical examples for isotopes and mixtures representative of postulated fast breeder reactors are given to illustrate quantitatively the effect of anisotropic scattering.
