Title 10-ENERGY is composed of four volumes. The parts in these volumes are arranged in the following order: Parts 1-50, 51-199, 200-499 and part 500-end. The first and second volumes containing parts 1-199 are comprised of chapter I-Nuclear Regulatory Commission. The third and fourth volumes containing part 200- end are comprised of chapters II, III and X-Department of Energy, chapter XIII-Nuclear Waste Technical Review Board, chapter XVII-Defense Nuclear Facilities Safety Board, and chapter XVIII-Northeast Interstate Low-Level Radioactive Waste Commission. The contents of these volumes represent all current regulations codified under this title of the CFR as of January 1, 2020.