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Finland’s Nuclear Waste Vault
April 26 , 2026
14 hrs 0 min
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- Finland is preparing to operationalise the world’s first permanent nuclear waste repository.
- The facility, called Onkalo, is located on Olkiluoto Island.
- It will store spent nuclear fuel for up to 100,000 years.
- It is built 400–450 metres underground in stable bedrock using a multi-barrier safety system (metal canisters, copper capsules, bentonite clay, rock layers).
- Bentonite clay swells on contact with water and prevents leakage of radioactive material.
- The repository is designed for passive safety, meaning it will remain secure without human maintenance.
- Finland plans to store about 6,500 tonnes of nuclear waste, providing a model for safe long-term disposal globally.
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