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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.
William A. Zanotelli, Stephen M. Craven, Garry D. Miller, William E. Moddeman, Frank Novak, David M. Hercules
Nuclear Science and Engineering | Volume 85 | Number 1 | September 1983 | Pages 17-25
Technical Paper | doi.org/10.13182/NSE83-A17147
Articles are hosted by Taylor and Francis Online.
The conditions inside the bubble formed in a hypothetical core disruptive accident (HCDA) of a liquid-metal fast breeder reactor have been simulated with a LAMMA 500 laser microprobe mass analyzer. Results for Na2U2O7 show that negative diuranate and positive sodium uranate ions are produced. Higher laser powers favor greater fragmentation to U+, [UO]+, and [UO2]+. The Na2O/UO2 results indicate vapor phase reactions result in the formation of positive and negative sodium uranate ion intermediates. Positive hydrogen ions are observed in some spectra. Higher laser energies (higher HCDA temperatures) favor sodium uranate ion formation. These data support the view that sodium uranate ionic precursors are formed in the vapor phase, bubble, of a simulated HCDA reaction. A prior argon-ion-excited secondary ion mass spectroscopy investigation of Na2O/UO2 and Na2U2O7 showed no sodium uranate species, only the formation of U+, [UO]+, and [UO2]+.
