Subpart T: National Emission Standards for Radon Emissions From the Disposal of Uranium Mill Tailings
Subpart T was originally established to limit radon-222 emissions from uranium mill tailingstailingsThe remaining portion of a metal-bearing ore after some or all of a metal, such as uranium, has been extracted. piles that are no longer operational. In 1994, Subpart T was amended so that it no longer applied to facilities under license with Nuclear Regulatory Commission (NRC). Inactive uranium mill tailings piles at NRC-licensed facilities are subject to the radon control provisions in 40 CFR Part 192.
All facilities subject to any NESHAP must meet 40 CFR Part 61, Subpart A: General Provisions.