"Nuclear power blocks" aren't really a thing. If I assume they mean a fuel rod/fuel cell, they're mostly harmless because on their own there's not enough Uranium for a chain reaction.

Edit: found and read about it, apparently its a building at a power plant, not the plant itself, and there are currently no changes to background radiation levels so no reactor damage has occurred.

Europe does have to wake up, though.

And no, this doesn't seem like the CIA.