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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 69 | Number 1 | January 1979 | Pages 39-46
Technical Paper | doi.org/10.13182/NSE79-A21283
Articles are hosted by Taylor and Francis Online.
The neutron capture cross sections of 240Pu and 242Pu were measured in the energy range from 50 to 250 keV, using 197Au as a standard. Neutrons were produced via the T(p,n) reaction with the Karlsruhe 3-MV pulsed Van de Graaff accelerator. Capture events were detected by a Moxon-Rae detector. A flight path as short as 66 mm was used in the measurements to obtain a sufficient signal-to-background ratio. An overall uncertainty of 7 to 11% was obtained for 240Pu and of 10 to 15% for 242Pu. In the region of overlap between 50 and 90 keV, the presented data agree with our previous results. They confirm the existing data for 240Pu. Discrepancies up to 30% for 240Pu and 242Pu were found in the evaluated ENDF/B-IV files while KEDAK 3 fits reasonably well to the experimental data.
