10 C.F.R. § 53.726 – Communications.

(a) An applicant or licensee or facility licensee must submit any communication or report required by the regulations contained within §§ 53.725 through 53.830 and must submit any application filed under these regulations to the Commission.
(b) Each facility licensee that is required to comply with the requirements of §§ 53.760 through 53.795 (i.e., interaction-dependent-mitigation facilities) must notify the appropriate NRC contact within 30 days of the following in regard to a licensed operator or senior operator:
1. (1) Permanent reassignment from the position for which the facility licensee has certified the need for a licensed operator or senior operator under § 53.775(a)(1);
2. (2) Termination of any operator or senior operator; or
3. (3) Permanent disability or illness as required under § 53.770.