sentences:  They point to a history of naval and nuclear accidents in Russia and the former Soviet Union, including the Chernobyl disaster of 1986.Russia does have 50 years of experience operating a fleet of nuclear-powered icebreakers that are also used for scientific and Arctic tourism expeditions.However earlier incidents (Lenin, 1957, and Taymyr, 2011) involving radioactive leaking from such vessels also contribute to safety concerns for FNPPs.