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, nuclear materials and nuclear waste.

Current issues

5.3.2026
Press release

Espoo’s nuclear reactor is now decommissioned, and the site has been cleaned of radioactivity

Finland’s first nuclear reactor is no longer classified as a nuclear facility. At the end of last year, the Radiation and Nuclear Safety Authority concluded that the dismantling and decontamination of the Otaniemi research reactor from all radioactive materials had been completed. The building can now be r...

16.2.2026
News item

Nuclear Safety Is a ‘Common Good’ for European Citizens, Conclude Heads of the French and Finnish Nuclear Regulators

STUK and ASNR, the nuclear and radiation safety authorities in Finland and France, met for bilateral discussions in Vantaa and Olkiluoto from February 11th to February 13th.