Olkiluoto 3

Teollisuuden Voima Oyj initiated investigations concerning the construction of a new plant at the Olkiluoto nuclear power plant area in Eurajoki at the end of the 1990s, and filed an application for a Government decision-in-principle with the Government in November 2000. In February of the following year, STUK provided a preliminary safety assessment for the Government decision-in-principle, in which the preliminary plans and designs related to the plant were assessed and the major safety concerns were raised. The Government issued a favourable decision-in-principle in 2002, which was subsequently ratified by Parliament.

A picture of Olkiluoto 3 Nuclear Power Plant

At the beginning of 2004, TVO filed an application for a construction licence with the Finnish Government, which was granted in February 2005. The construction of the third nuclear power plant unit in Olkiluoto was commenced in June of the same year. The new plant unit constructed at the western end of the Olkiluoto island, next to the OL1 and OL2 units, is a pressurised water plant of the EPR type that is based on the third-generation French-German European Pressurised Water Reactor concept. When complete, the net electrical output of the unit will be approximately 1,600 megawatts. The output will be slightly higher than that of the largest nuclear power plant units existing to date. According to the schedule updated by the plant supplier, regular electricity production at the plant unit will commence in January 2020.

A picture of a row of binders

TVO filed an application for an operating licence with the Finnish Government in the spring 2016. Teollisuuden Voima may only load nuclear fuel in the reactor of the power plant when the Government has granted an operating licence for the plant.

STUK has overseen and inspected the construction and trial run of the plant and TVO’s preparations for the upcoming operation phase. STUK describes it's regulatory oversight activities in it's triannual reports.

A picture of STUK's inspector inspecting primary circuit

The owner of the power plant is Teollisuuden Voima Oyj (TVO), and it is supplied by a consortium formed by Areva NP and Siemens AG.

Plant unit Construction licence
granted
Nominal electric power
(net, MW)
Type, supplier
Olkiluoto 3 17 February 2005 approx. 1,600 Pressurised water reactor
(PWR), Areva NP