Defined by the WIPP Land Withdrawal Act as "waste containing more than 100 nanocuries of alpha-emitting transuranic isotopes per gram of waste with half-lives greater than 20 years, except for (A) high-level radioactive waste, (B) waste that the Secretary of Energy has determined, with concurrence of the Administrator of the Environmental Protection Agency, does not need the degree of isolation required by the disposal regulations, or (C) waste that the Nuclear Regulatory Commission has approved for disposal on a case-by-case basis in accordance with part 61 of title 10 Code of Federal Regulations (CFR)."
Waste Isolation Pilot Plant Web Site - The Waste Isolation Pilot Plant (WIPP) is a deep geologic repository for the permanent disposal of radioactive waste. WIPP safely disposes of the nation's defense-related transuranic waste (TRU waste). Located in the Chihuahuan Desert, outside Carlsbad, N.M., WIPP began disposal operations in March 1999. WIPP is managed by the Carlsbad Field Office.