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, and chapter XVII - Defense Nuclear Facilities Safety Board.
The contents of these volumes represent all current regulations codified under this title of the CFR as of January 1, Annually.