I'm guessing the U.S. has some very sophisticated radiation detection equipment. If we do indeed have the equipment, and the reactor is actually is leaking; it'll be interesting if the U.S. divulges whether radiation is detected. They may want to keep their intelligence gathering abilities secret. Hopefully the radiation leak will be corroborated by other sources, besides the French. I guess once the citizens of several communities die from radiation poisoning that we'll have confirmation.