Research reactor in Otaniemi

Finland's first nuclear reactor was commissioned in Espoo's Otaniemi in 1962. The FiR 1 nuclear reactor of the Technological Research Center VTT Oy was a small research reactor with a thermal output of 250 kilowatts. The water-cooled, pool-type reactor originally built for research and education and later also for isotope production and radiotherapy has been specifically developed for the university environment.

In 2012 VTT decided for financial reasons to stop the use of FiR 1 and the reactor was permanently shut down in summer 2015. VTT was granted permission to decommission the reactor in June 2021. Planning for dismantling the research reactor is underway.