"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.

"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.