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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.
Itsuro Kimura, Katsuhei Kobayashi
Nuclear Science and Engineering | Volume 106 | Number 3 | November 1990 | Pages 332-344
Technical Paper | doi.org/10.13182/NSE90-A29061
Articles are hosted by Taylor and Francis Online.
Thermal-neutron-driven fast neutron fields using a fission plate and a 6LiD converter are briefly reviewed. The characteristics of a large (27-cm-diam × 1.1-cm-thick) fission plate made of highly enriched uranium and a sandwich-type 6LiD converter (two 10-cm-square × 1-cm-thick 6LiD plates) are presented, both of which have been used at the heavy water thermal neutron facility at the Kyoto University Reactor. The neutron spectra in both fields were calculated by the MCNP Monte Carlo code. The average neutron energy and the neutron spectrum of the 6LiD converter were measured and the results agree with the predicted values. Using both fields, we measured the average cross sections for some threshold reactions, 6 with the fission plate and 23 with the 6LiD converter. The results are compared with evaluated values and previous measurements.
