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Finland Nears Completion of World's First Permanent Nuclear Waste Repository
Helsinki: Finland is on the verge of launching the world's first permanent underground repository for spent nuclear fuel, a milestone that experts say could transform the way nations manage highly radioactive waste. The facility, known as Onkalo, has been developed deep beneath the forests of western Finland and is designed to safely isolate nuclear waste for up to 100,000 years.
Located on Olkiluoto Island near the municipality of Eurajoki, the repository sits approximately 430 metres below ground inside 1.9-billion-year-old bedrock. Engineers have spent more than two decades constructing a vast network of tunnels intended to permanently store spent fuel from Finland's nuclear power plants. The project is widely regarded as the world's first operational deep geological repository for high-level nuclear waste.
Under the disposal process, radioactive fuel will be sealed inside corrosion-resistant copper canisters and placed in specially drilled chambers. The canisters will then be surrounded by bentonite clay, a material chosen for its ability to expand when exposed to moisture and create a natural protective barrier. The multi-layered system is designed to prevent the release of radiation into the environment for tens of thousands of years.
The repository has a planned capacity of around 6,500 tonnes of spent nuclear fuel, enough to accommodate waste generated by Finland's existing nuclear reactors. Once filled over the coming decades, the facility will eventually be sealed permanently, leaving the radioactive material isolated deep underground as it slowly decays to safer levels.
Supporters of the project describe it as a breakthrough in nuclear waste management, addressing one of the industry's longest-standing challenges. Finland's approach has drawn international attention, with several countries studying the model as they expand nuclear power generation to meet energy and climate goals. Similar projects are being pursued elsewhere, but Finland is expected to become the first nation to place a permanent geological repository into operation.
Despite the achievement, some scientists continue to debate how engineered barriers will perform over extremely long timescales and whether future generations will be able to understand the dangers posed by the buried waste. Nevertheless, the Onkalo project is being hailed as a landmark step in humanity's effort to safely manage radioactive materials far beyond the lifespan of modern civilizations.
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