10 C.F.R. § 862.6 Voluntary minimum altitude.
Title 10 - Energy
In addition to complying with all applicable FAA prohibitions or restrictions, aircraft are requested to maintain a minimum altitude of 2,000 feet above the terrain of a designated site. Applicable FAA prohibitions or restrictions take precedence over this voluntary minimum altitude.
Title 10: Energy
PART 862—RESTRICTIONS ON AIRCRAFT LANDING AND AIR DELIVERY AT DEPARTMENT OF ENERGY NUCLEAR SITES
§ 862.6 Voluntary minimum altitude.