There was a movie about Russian arctic base, where the hero for some reason had to spend the night outside and warm himself with discarded portable nuclear plan

There was a movie about Russian arctic base, where the hero for some reason had to spend the night outside and warm himself with discarded portable nuclear plant. When he manages to get back inside first thing he was looking was iodine tablets. Looked very handy thing that nuclear hand warmer. Like big cabin stove, which runs for ever and needs no fuel.