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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.-J. Huang, H. Paul Wang, Chih C. Chao, H. H. Liu, M. C. Hsiao, S. H. Liu
Nuclear Science and Engineering | Volume 151 | Number 3 | November 2005 | Pages 355-360
Technical Note | doi.org/10.13182/NSE05-A2555
Articles are hosted by Taylor and Francis Online.
Experimentally, two-stage oxidation of spent low-level radioactive resin was found by thermo- gravimetric analysis (TGA). About 24% of the spent resins was oxidized at 600 to 900 K. Online Fourier transform infrared spectra showed that the decomposition of the -SO3H species in the resin to SO2 occurred at 670 and 1020 K. The numerical calculation from TGA weight loss data at different heating rates showed that the global activation energies for oxidation of the spent resins were 108 to 138 kJmol-1. The reaction orders for resin and oxygen were about 1.0 and 3.5, respectively. The global rate equations for oxidation of the resin in the first and second stages can be expressed as dx1/dt (s-1) = 2.3 × 107 (s-1)exp[-117 900(Jmol-1)/T(K)][1 - x (%)]0.82 [O2 (vt%)]3.5 (x denotes the reaction conversion) and dx2/dt = 8.4 × 1017 exp(-239 500/RT) (1 - x)0.9[O2]4.5, respectively.
