Section 9.34 - Assessment of interest and debt collection(a) The NRC will assess interest on the fee amount billed starting on the 31st day following the day on which the billing was sent in accordance with NRC's regulations set out in § 15.37 of this chapter. The rate of interest is prescribed in 31 U.S.C. 3717 .(b) The NRC will use its debt collection procedures under part 15 of this chapter for any overdue fees.