10 C.F.R. § 140.21
Each licensee required to have and maintain financial protection for each nuclear reactor as determined in § 140.11(a)(4) shall at the issuance of the license and annually, on the anniversary of the date on which the indemnity agreement is effective, provide evidence to the Commission that it maintains one of the following types of guarantee of payment of deferred premium in the amount specified in § 140.11(a)(4) for each reactor it is licensed to operate:
[42 FR 50, Jan. 3, 1977, as amended at 71 FR 15012, Mar. 27, 2006; 74 FR 62686, Dec. 1, 2009; 79 FR 38769, July 9, 2014]