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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.
D. R. Harris, J. A. Mitchell
Nuclear Science and Engineering | Volume 44 | Number 2 | May 1971 | Pages 221-238
Technical Paper | doi.org/10.13182/NSE71-A19670
Articles are hosted by Taylor and Francis Online.
In the design of power reactors containing lattices of fuel rods in liquid coolant, it would be useful to employ cell-averaged transport parameters reflecting anisotropic neutron migration when this is significant. Measurements and Monte Carlo calculations of anisotropic neutron migration are described for rod lattices. The well-known flux peaking near thin sources is found to be accompanied by thin source effects on migration areas. Situations of substantial migration anisotropy and thin source effects are delimited.
