Spent nuclear fuel dry storage cask is a method of storing high-level radioactive waste, such as spent nuclear fuel that has already been cooled in the spent fuel pool for at least one year. During the 2000s, dry cask storage was used in the United States, Canada, Germany, Switzerland, Spain, Belgium, Sweden, the United Kingdom, Japan, Armenia, Argentina, Bulgaria, Czech Republic, Hungary, South Korea, Romania, Slovakia, Ukraine and Lithuania.

Spent nuclear fuel (SNF) or used nuclear fuel is fuel that has been irradiated in a nuclear power reactor at a nuclear power plant. Spent nuclear fuel contains plutonium, uranium or even thorium that has been permanently withdrawn from the nuclear reactor. There are many different types of spent nuclear fuel that are stored worldwide today. Some of the categories of SNF include materials production fuels, naval nuclear propulsion fuel, research reactor fuel, specialty fuel and the most common - commercial nuclear power reactor fuels.

Spent nuclear fuel is generally stored either in spent fuel pools or in dry casks. At present, most spent nuclear fuel is stored in spent fuel pools at individual nuclear reactor sites. Dry cask storage is gaining popularity in recent years, particularly after the Fukushima nuclear disaster of 2011. In dry cask storage, spent nuclear fuel assemblies are generally placed in canisters that have a heavy shielding around them. The shield has vents that allow air to flow through the canister wall in order to cool the fool.

Global spent nuclear fuel dry storage cask market was valued at 290 Million US$ in 2018 and is projected to reach 358 Million US$ by 2024, at a CAGR of 3.56% during the forecast period.

Key players in global spent nuclear fuel dry storage cask market include: Holtec International, NAC Intl, Orano, GNS etc.