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Olkiluoto 3 The newest nuclear power plant unit in Finland is Olkiluoto 3, which is located in Olkiluoto, Eurajoki, Finland, owned by Teollisuuden Voima Oyj (TVO). STUK has supervised the project from the design of the plant unit through manufactu...https://stuk.fi/en/en/olkiluoto-3
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Intensive year of supervision in Olkiluoto The year 2022 was a significant year for the Olkiluoto 3 plant unit (OL3). STUK supervised the plant through inspection visits, monitoring commissioning tests and inspecting various reports and granted pe...https://stuk.fi/en/intensive-year-of-supervision-in-olkiluoto
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Olkiluoto nuclear power plant The three nuclear power plant units located in Olkiluoto, Eurajoki, are owned by Teollisuuden Voima Oyj (TVO). Olkiluoto 1 was taken into commercial use in 1979 and Olkiluoto 2 in 1982. In terms of its type, the Olkil...https://stuk.fi/en/olkiluoto-nuclear-power-plant
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STUK career stories: Elina works as a local inspector at the Olkiluoto nuclear power plant I am Elina and I work as STUK’s local inspector at the Olkiluoto nuclear power plant in Eurajoki. In terms of my training, I have an MSE in material technol...https://stuk.fi/en/stuk-career-stories-elina-works-as-a-local-inspector-at-the-olkiluoto-nuclear-power-plant
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Reporting on nuclear safety Inspections at the Olkiluoto nuclear power plant STUK carries out inspections to oversee the operation and use of the Olkiluoto nuclear power plant. The periodic inspection programme covers safety management, main opera...https://stuk.fi/en/inspections-at-the-olkiluoto-nuclear-power-plant
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STUK’s supervision ensured the safety of nuclear power plants In 2023, the Radiation and Nuclear Safety Authority (STUK) supervised the safety of the nuclear power plants in operation and ensured that current decrees and regulations were complied ...https://stuk.fi/en/stuk-s-supervision-ensured-the-safety-of-nuclear-power-plants
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Reporting on nuclear safety In this section, we report on the regulatory oversight of nuclear safety and security carried out by the Radiation and Nuclear Safety Authority (STUK) and report on the inspections carried out this year. The website als...https://stuk.fi/en/reporting-on-nuclear-safety
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Radiation safety of nuclear facilities Control of radiation safety is a part of the supervision of the operating condition of a nuclear power plant. The objective is to ensure that the total radiation exposure caused by the operation of the nuclea...https://stuk.fi/en/radiation-safety-of-nuclear-facilities
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Radiation and Nuclear Safety Authority in 2022 Director General’s review The new office building in Vantaa meets STUK's special requirements Intensive year of supervision in Olkiluoto Professors of Practice instill radiation safety expertise and r...https://stuk.fi/en/year-2022-in-stuk
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Regulatory oversight of nuclear facilities STUK oversees the Loviisa and Olkiluoto nuclear facilities and Posiva's encapsulation and final disposal facilitys of spent nuclear fuel. In addition, STUK supervises the decommissioning of VTT’s research...https://stuk.fi/en/regulatory-oversight
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Nuclear safety STUK supervises nuclear safety in Finland. The license holder is responsible for the safety of nuclear energy use, but STUK sets the safety requirements and oversees their compliance. STUK's supervision includes nuclear facilities, ...https://stuk.fi/en/nuclear-safety
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Types of nuclear power plants Over the past decades, a wide range of different types of nuclear power plants have been designed and built around the world, but only a few have reached large-scale commercial operation. The most common reactor types...https://stuk.fi/en/types-of-nuclear-power-plants
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The encapsulation and final disposal facility of spent nuclear fuel In 2015, Posiva Oy received permission to build a used fuel encapsulation and disposal facility in Olkiluoto. Posiva started the construction of the disposal facility at the end o...https://stuk.fi/en/final-disposal-facility
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Current issues We are publishing press releases and news articles on topical radiation and nuclear safety issues on this section of our website. Press releases RSS (Opens New Window) (Opens New Window) 20.5.2026 Press release STUK heading an EU pr...https://stuk.fi/en/current-issues
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Safety assessment of spent nuclear fuel disposal facility continued Posiva Oy is building an encapsulation and final disposal facility for spent nuclear fuel in Olkiluoto. As this facility is a nuclear plant, the Radiation and Nuclear Safety Autho...https://stuk.fi/en/safety-assessment-of-spent-nuclear-fuel-disposal-facility-continued
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Information on nuclear waste Radioactive waste means a material, item or structure that contains radioactive substances, has no use and which, due to its radioactivity, must be rendered harmless. Typically, radioactive waste cannot be disposed of;...https://stuk.fi/en/information-on-nuclear-waste
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The use of nuclear energy carried out safely — the regulatory reform is progressing Based on STUK’s supervision, the use of nuclear energy did not pose a risk to the population, society, the environment or future generations in 2024. The reform of...https://stuk.fi/en/the-use-of-nuclear-energy-carried-out-safely-the-regulatory-reform-is-progressing
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Nuclear waste management In Finland, nuclear waste is accumulated in the nuclear power plants in Loviisa and Olkiluoto and in the research reactor located in Otaniemi. According to the law, this waste must be managed in Finland, up to and includin...https://stuk.fi/en/nuclear-waste-management
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Director General’s review Like previous years, 2023 was a year of success for STUK. Professional and motivated personnel achieved monitoring and operational objectives as expected. STUK’s work was influenced by the goals of the government programm...https://stuk.fi/en/director-general-s-review-2023
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Working at STUK We employ over 300 people. We are experts in many different fields, but we all work together to achieve the shared goal – radiation safety. The purpose of all our activities is to protect people, society, the environment and future...https://stuk.fi/en/stuk-as-a-workplace