(1) A site operator shall, on or before May 1, 1992, and each year thereafter, file with the commission a statement showing its gross operating revenue from intrastate operations for the preceding calendar year, or portion thereof, and pay to the commission a fee equal to one percent of the amount of the gross operating revenue, exclusive of site surveillance fees, perpetual care and maintenance fees, site closure fees, and state or federally imposed out-of-region surcharges.

(2) Fees collected under this chapter shall reasonably approximate the cost of supervising and regulating site operators. The commission may order a decrease in fees by March 1st of any year in which it determines that the moneys then in the radioactive waste disposal companies account of the public service revolving fund and the fees currently to be paid will exceed the reasonable cost of supervising and regulating site operators.

(3) Fees collected under this section or under any other provision of this chapter shall be paid to the commission and shall be transmitted to the state treasurer within thirty days to be deposited to the credit of the public service revolving fund.

(4) Any payment of a fee imposed by this chapter made after its due date shall include a late fee of two percent of the amount due. Delinquent fees shall accrue interest at the rate of one percent per month.