Finland nuclear waste dump

Successful start to trial run at Finnish repository. The first stage of the trial run of placing disposal cannisters in the Onkalo used nuclear fuel repository has been completed successfully, Finnish waste management company Posiva has announced. At the repository, used fuel will be placed in the bedrock, at a depth of about 430 metres. The disposal system consists of a tightly sealed iron-copper canister, a bentonite buffer enclosing the canister, a tunnel backfilling material made of swellable clay, the seal structures of the tunnels and premises, and the enclosing rock.

World Nuclear News 13th Sept 2024

https://www.world-nuclear-news.org/articles/successful-start-to-trial-run-at-finnish-repository