Reference concepts for geologic disposal of used nuclear fuel and high-level radioactive waste in the U.S. are developed, including geologic settings and engineered barriers. Repository thermal analysis is demonstrated for a range of waste types from projected future, advanced nuclear fuel cycles. The results show significant differences among geologic media considered (clay/shale, crystalline rock, salt), and also that waste package size and waste loading must be limited to meet targeted maximum temperature values.

This report provides information on the inventory of commercial spent fuel (SNF) and high-level
radioactive waste (HLW) in the United States, as well as non-commercial SNF and HLW in the U.S.
Department of Energy (DOE) complex. Actual or estimated quantitative values for current inventories are
provided along with inventory forecasts derived from examining different future commercial nuclear power
generation scenarios. The report also includes select information on the characteristics associated with the