10 CFR § 810.7 - Activities requiring specific authorization.
(c) Engaging in or providing technology (including assistance) for any of the following activities with respect to any foreign country or entity (or a citizen or national of that country other than U.S. lawful permanent residents or protected individuals under the Immigration and Naturalization Act (8 U.S.C. 1324b(a)(3)):
(1) Uranium isotope separation (uranium enrichment), plutonium isotope separation, or isotope separation of any other elements (including stable isotope separation) when the technology or process can be applied directly or indirectly to uranium or plutonium;
(2) Fabrication of nuclear fuel containing plutonium, including preparation of fuel elements, fuel assemblies, and cladding thereof;
(6) Reprocessing of irradiated nuclear fuel or targets containing special nuclear material.