10 C.F.R. § 26.51
The requirements in this subpart apply to the licensees and other entities identified in § 26.3(a), (b) , and, as applicable, (c) for the categories of individuals in § 26.4(a) through (d) , and, at the licensee's or other entity's discretion, in § 26.4(g) and, if necessary, § 26.4(j) . The requirements in this subpart also apply to the licensees and other entities specified in § 26.3(c) , as applicable, for the categories of individuals in § 26.4(e) . At the discretion of a licensee or other entity in § 26.3(c) , the requirements of this subpart also may be applied to the categories of individuals identified in § 26.4(f) . In addition, the requirements in this subpart apply to the entities in § 26.3(d) to the extent that a licensee or other entity relies on the C/V to meet the requirements of this subpart. Certain requirements in this subpart also apply to the individuals specified in § 26.4(h) .
10 C.F.R. §26.51