from fukushima initial explosions, not from the regular nuke engines of the ship. you can find it from the sailors mouths about how they were contaminated. the ship went directly into the stuff coming off fukushima. and was in it for hours, and nobody had any special protection gear on during this time.
Again, in the commercial nuclear power plants contaminations occur, uptakes of rad material occur, ‘over exposures’ occur. Yet, somehow there are not any greater effects.
Color me skeptical without specifics.