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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.
E. D. Arthur, P. G. Young, D. G. Madland, R. E. MacFarlane
Nuclear Science and Engineering | Volume 88 | Number 1 | September 1984 | Pages 56-70
Technical Paper | doi.org/10.13182/NSE84-A17139
Articles are hosted by Taylor and Francis Online.
A major revision of the ENDF/B-V evaluation of neutron-induced nuclear data for 239Pu has been completed for neutron energies between 8 keV and 20 MeV. The most important changes to the evaluation include incorporation of a comprehensive new theoretical analysis based on recent experimental data to replace part of the total cross-section file and all of the elastic and inelastic cross sections and secondary distributions, reevaluation of the prompt and total average neutron multiplicities from fission for incident energies between 0.4 and 11.5 MeV to correct discrepancies of almost 3% with new experimental data, and the replacement of all secondary neutron energy spectra from fission with improved shapes based on approximations to a new theoretical method. The results have been validated by calculating measured quantities for five fast critical assemblies. The evaluation is being distributed as Revision 2 of ENDF/B-V by the National Nuclear Data Center at Brookhaven National Laboratory.
