Spent Nuclear Fuel Disposal

ONKALO® Research Facility

The underground ONKALO® research facility, which extends to a depth of 450 meters, provides valuable information on the suitability of the Olkiluoto bedrock for final disposal. The bedrock is studied geologically, hydrogeologically and geochemically, among other things. The site is excavated using the traditional drill-blasting method. Research, surveys and monitoring of conditions can be conducted from ONKALO® without disturbing the construction of the disposal facility.

ONKALO® is a registered trademark of Posiva Oy

Spent Nuclear Fuel Disposal Facility

The world’s first spent nuclear fuel disposal facility will be built in Olkiluoto, on the Eura River. Spent nuclear fuel is packaged in copper canisters that protect the fuel from mechanical stress for up to 100,000 years.

The disposal facility will be excavated to a depth of 400 meters in the bedrock of Olkiluoto and the disposal canisters will be placed in holes drilled in the disposal tunnels. The stable bedrock provides almost unchanging conditions for nuclear fuel and protects against surface temperature fluctuations.

Excavation work began in 2016 and final disposal of nuclear waste is scheduled to begin in the 2020s.