A buildup of hydrogen gas causes another explosion, destroying the outer shell of a reactor at the quake-damaged Fukushima No. 1 plant.
A senior U.S. official said the blast -- the third in three days at the plant since a powerful earthquake struck Japan on Friday -- may be more dangerous than the others.
Half of the fuel rods were exposed, not immersed in water, and the suppression pool, which holds the water used to keep the rods cool, seemed to be damaged, according to Tokyo Electric Co., which runs the plant, and government officials
Japanese news agency NHK reported that the radiation levels at the front gate of the Daiichi plant were so high that a person would receive more in one hour than they would receive naturally in an entire year.
Video Source: AP
