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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.
K. Wisshak, F. Käppeler
Nuclear Science and Engineering | Volume 66 | Number 3 | June 1978 | Pages 363-377
Technical Paper | doi.org/10.13182/NSE78-A27219
Articles are hosted by Taylor and Francis Online.
The neutron capture cross sections of 240Pu and 242Pu were measured in the energy range from 10 to 90 keV. The capture cross sections of both 197Au and 238U were chosen as standards. Neutrons were produced via the 7Li(p,n) reaction with the Karlsruhe 3-MV pulsed Van de Graaff accelerator. Capture events were detected by a Moxon-Rae detector. The high neutron flux available at flight paths as short as ∼10 cm offers a signal-to-background ratio one order of magnitude better than obtained in previous experiments. The cross-section ratios could therefore be determined with a total statistical and systematic uncertainty of 4 to 10% for 240Pu and 6 to 10% for 242Pu. The results agree with previous data, while discrepancies to the evaluated files ENDF/B-IV and KEDAK 3 were found (up to 30% for 240Pu and up to 50% for 242Pu).
