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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.
J. B. Garg
Nuclear Science and Engineering | Volume 65 | Number 1 | January 1978 | Pages 76-92
Technical Paper | doi.org/10.13182/NSE78-A27128
Articles are hosted by Taylor and Francis Online.
High-resolution total neutron cross-section measurements in natural vanadium. manganese, and cobalt were made in the energy range up to a few hundred keV with the Columbia University Nevis neutron velocity spectrometer using a 200-m flight path and a nominal resolution of 0.5 ns/m. These cross-section data were analyzed with an R-matrix multilevel code, and the resonance parameters (Eλ, Γπ. S0, ⟨D⟩) were obtained. In addition, making use of the published thermal energy data, the parameters of the bound levels were determined. From these measurements the values of S0 up to 215-keV neutron energy for vanadium [ = 8.62 ± 2.45, = 8.79 ± 2.50, and = 8.7 ± 1.81; up to 200 keV for manganese [ = 3.10 ± 0.70, = 4.75 ± 1.10, and = 3.93 ± 0.651, and up to 80 keV for cobalt [ = 4.02 ± 0.96, = 2.94 ± 0.75. and = 3.48 ± 0.65 in units of 10−4 eV−1/2] have been obtained. The corresponding mean level spacings up to 215 keV for vanadium are = 8.7 ± 1.25 keV and = 8.33 ± 1.25 keV, up to 100 keV for manganese are = 3.85 ± 0.55 keV and = 4.00 ± 0.59 keV, and up to 80 keV for cobalt are = 2.29 ± 0.28 keV and = 2.67 ± 0.36 keV. The value of spin cut-off factor a is found to vary from 2.7 to 4 for these nuclei. These results do not show any J dependence on the strength function.
