There is hereby established in the Treasury a Radiological Emergency Preparedness Fund, which shall be available under the Atomic Energy Act of 1954 [42 U.S.C. 2011 et seq.], as amended, and Executive Order 12657, for offsite radiological emergency planning, preparedness, and response. Beginning in fiscal year 1999 and thereafter, the Administrator of the Federal Emergency Management Agency (FEMA) shall promulgate through rulemaking fees to be assessed and collected, applicable to persons subject to FEMA’s radiological emergency preparedness regulations. The aggregate charges assessed pursuant to this section during fiscal year 1999 shall not be less than 100 percent of the amounts anticipated by FEMA necessary for its radiological emergency preparedness program for such fiscal year. The methodology for assessment and collection of fees shall be