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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.
R. N. Hwang
Nuclear Science and Engineering | Volume 21 | Number 4 | April 1965 | Pages 523-535
Technical Paper | doi.org/10.13182/NSE65-A18797
Articles are hosted by Taylor and Francis Online.
Because of great concern about the effect of resonance interactions on the Doppler-effect calculations, extensive studies have been made for various dilute systems. A simplified method which allows the simultaneous occurrence of more than one type of interference has been developed to calculate the temperature-dependent effective cross sections. Consequently, the numerical work involved is simplified considerably. Calculations have been made for typical PU239-U238, U235-U238, and Pu239-U238-Pu240 systems. The results of these calculations seem to indicate that the resonance interference will substantially increase the negative Doppler effect of the system as compared to the case where resonance interferences are ignored.
