An explosion Monday at the Fukushima Daiichi Nuclear Power Station blew the roof off the containment building of reactor No. 3, right. Reactor No. 1’s containment building, left, was damaged in an explosion on Saturday.Credit...NHK, via Agence France-Presse — Getty Images WASHINGTON — As the scale of Japan’s nuclear crisis begins to come to light, experts in Japan and the United States say the cou