According to the plan, the Hanhikivi nuclear power plant will be built in Pyhäjoki, on the Finnish Gulf Coast, 160 km from Skellefteå.
The government gave the green light eleven years ago, but since then it has all dragged on.
In a new report, the Finnish Ministry of Defense announces that an analysis must be made of the economic and geopolitical risks the project may entail, Finnish media report.
The ministry points out, among other things, that the plant may become dependent on Russian nuclear fuel.
Behind the construction is the consortium Fennovoima, which includes the state-owned Russian nuclear power company Rosatom.
Rosatom will supply the plant with a Russian-made pressurized water reactor.
Fennovoima hopes to start construction in 2029. The consortium then hoped to get permission to start construction next summer, to be able to start in the summer of 2023. But it will probably take a little longer - the risk analysis will probably be the basis for the decision on permission.
Since the start, the project has met with Swedish opposition.
A dozen municipalities along the Norrland coast have taken a stand against the construction and Swedish environmental activists have formed a network that is in the hands of the Finnish authorities.