Japan nuke expert: I presume melted fuel reacted violently with cement at Reactor No. 3, releasing large amounts of radioactive materials outside — TEPCO responds

“Most” of the fuel at Reactor No. 3 may have breached vessel after melting down twice

Japan nuclear expert: Massive “re-melting” occurred at Reactor No. 3 (DIAGRAM)

Rapid meltdown happened at Reactors No. 2 and 3 — Indicated by black smoke at No. 3