Because the hypocenter of the earthquake off coast of
Tohoku was shallow,
it has caused the large tsunami.
It became impossible for the power supply to stop
because the muddy stream flowed into the Fukushima
nuclear power plant in the coast and to supply water to
the nuclear fuel.
Therefore, it evaporate by the heat generated from the
nuclear fuel surrounding water, decrease rapidly water,
increase the nuclear reaction, and have caused an
accident.
The present does the operation to which danger is
suppressed by injecting decreasing water from the
outside.