This may have been reported before, since it was reported Monday by the Mainichi Daily News.
"Fuel inside one of the reactors at the Fukushima complex may have melted twice. "......possibly breached the vessel after melting again at the bottom of the vessel,.... Most of the fuel at the No. 3 reactor may have fallen into the containment vessel underneath and if so, the current method used to cool the reactor would need reviewing,...." This would further delay the schedule to contain the disaster.
Tanabe, a nuclear expert, said "I presume that the fuel fell to the bottom of the containment vessel made of concrete and reacted violently with its cement, releasing large amounts of radioactive materials into the outside from the pressure vessel."
"Elevated levels of radiation were actually detected for several days from March 21 in the Tohoku region in which the Daiichi power plant is located and the nearby Kanto region, which includes Tokyo and its surrounding area."