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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.
Y. L. Sandler, R. H. Kunig
Nuclear Science and Engineering | Volume 64 | Number 4 | December 1977 | Pages 866-874
Technical Paper | doi.org/10.13182/NSE77-A14502
Articles are hosted by Taylor and Francis Online.
The solubility of a nickel ferrite, NixFe3-xO4, as a model substance for deposits forming on the cladding of nuclear fuel elements of pressurized water reactors is determined in aqueous solutions of primary coolant composition at different pH and hydrogen concentrations, in the temperature region from 230 to 330°C. The temperature coefficient of solubility changes from negative to positive at about pH 7 with increasing pH. The data agree reasonably well with those of Sweeton and Baes for magnetite, considering the lower iron activity in the nickel ferrite. The solubility of nickel is generally lower than that which corresponds to a congruent solution and goes through a minimum near pH 7.4. The iron solubility appears to depend on the one-third power of the hydrogen concentration in solution in the region from 20 to 100 cm3 H2/kg H2O, as expected. Preliminary results, however, indicate that at lower hydrogen concentrations, the dependence on the hydrogen concentration can decrease, possibly due to the formation of cation vacancies.
