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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.
Paul A. Robinson, Jr., George D. Sauter
Nuclear Science and Engineering | Volume 49 | Number 2 | October 1972 | Pages 117-129
Technical Paper | doi.org/10.13182/NSE72-A35500
Articles are hosted by Taylor and Francis Online.
Inverse Compton scattering, wherein a photon gains energy as a result of a reaction with a moving electron, has been studied as a potential energy loss mechanism in the operation of a controlled thermonuclear reactor (CTR). Assuming local thermodynamic equilibrium within a 500-cm-diam plasma at 20 keV we have calculated, for various plasma densities, the influence of inverse Compton scattering on steady-state photon energy leakage via two potential cooling effects: the increased escape probability of the photons generated within the plasma itself, and the negative net energy deposition within the plasma of an incident external photon flux, such as might be generated by the CTR radiation shield through (n,γ) reactions and photon scattering. For currently anticipated CTR plasma densities (1015 ions/cm3), the increase in steady-state photon leakage due to inverse Compton scattering is negligible. For plasma densities of 1019 ions/cm3 or more, the increase is significant (≥10%).
