Officials now believe that radiation is leaking from the containment at the Fukushima Dai-ichi nuclear plant, making Japan’s nuclear accident worse than the 1979 accident at Three-Mile Island but still not as bad a Chernobyl.
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At Three Mile Island, the radiation leak was held inside the containment shell — thick concrete armor around the reactor. The Chernobyl reactor had no shell and was also operational when the disaster struck. The Japanese reactors automatically shut down when the quake hit.
