MOX fuel that was believed to have been kept cool at the bottom of one of the reactors at the crippled Fukushima No. 1 nuclear plant after its core melted is believed to have breached the vessel after melting again, a study said Monday.The study by Fumiya Tanabe, an expert in nuclear safety, said most of reactor 3’s mixed uranium-plutonium oxide fuel may have dribbled into the containment vessel underneath, and if so, the current method being used to cool the reactor will have to be rethought.
via Unit 3 MOX likely melted through | The Japan Times Online.