Basalt Waste Isolation Project

The Basalt Waste Isolation Project (BWIP) broke ground at Hanford Site in 1976, conducting tests aimed at siting a safe and isolated repository for reactor irradiated fuel and other nuclear byproducts. Between 1976 and enactment of the Nuclear Waste Policy Act of 1982 (NWPA), studies at the Hanford site continued to evaluate the geologic and hydrologic suitability of the BWIP repository in the underlying basalt.

Source: Wikipedia — Basalt Waste Isolation Project (CC BY-SA 4.0)