; (B) Differentiation among various reactor types; (C) Differentiation among LEU enriched up to 10 percent of the uranium-235 isotope and LEU enriched above10 percent of the uranium-235 isotope; and (D) Provisions to prevent transactions designed to evade the purpose of this section. (e) In this section: (1) Allied Country means any nation with which the United States is engaged in a common military effort or with which the United States has entered into a common defensive military alliance. (2) Covered Domestic Reactor means a nuclear reactor licensed by the Nuclear Regulatory Commission for industrial or commercial purposes. (3) LEU means uranium enriched to less than 20 percent of the uranium-235 isotope, including that which is derived from highly enriched uranium. (4) Secretary means the Secretary of Energy. (5) Trusted Source Requirement means the percentage of conversion and enrichment that must occur within the United States or an Allied Country. (f) In administering, implementing or enforcing the Trusted Source Requirement, the Department shall only use existing statutory authorities. (g) That the Secretary of Energy may use funds appropriated or otherwise made available for a commitment under this section for a commitment only if the full extent of the anticipated costs stemming from that commitment is recorded as an obligation at the time that the commitment is made and only to the extent that up-front obligation is recorded in full at that time. 312. (a) Of the amounts previously appropriated under the heading Department of Energy—Energy Programs in division J of the Infrastructure Investment and Jobs Act ( Public Law 117–58 ) that are made available for fiscal years 2024, 2025, and 2026, the following amounts shall be available, in addition to amounts otherwise made available under such heading, for the following purposes: (1) Up to $800,000,000 for Advanced Nuclear Fuel Availability, of which up to $266,666,666 shall be available for each of fiscal years 2024, 2025, and 2026