I am not a specialist, so please forgive mistake of recognition and technical term might be found there.
Japan is a country where natural energy resources are few. But energy that did not depend on the foreign country was necessary to develop as an industrialized country. Adding, oil crises knew that bias of the energy dependence were dangerous. Then nuclear power was selected as a stable supply source of energy.
The nuclear power plant was doing measures for earthquake and tsunami, scrammed normally. The function cooling the reactor core normally began operating. However, tsunami swept subsystems away. Diesel generator stopped because lost radiator, Emergency Core Cooling System operated with the battery for a while. Unfortunately, power supply has not recovered ahead of that the battery rose. :-
The plant was preparing in the Earthquake Magnitudes 8 class and Tsunami height 5 meters. But hitted world 4th largest Earthquake Magnitudes 9 and Tsunami height 10 meters.
Taro area, Miyagi pref leveed 10m height and 2433 meter long but the tsunami exceeded. Its height was over 20 meters, the fifth floor of the building. :-
Could you believe?
Yep, Government and Tokyo Electric irritated and disappointed us. :-
However, I am taking an optimistic view at the same time. It is saying ethnical joke about Japan, Brave and capable soldier and incompetent senior officer. I hope I am looking at selected man by the Dilbert Principle on TV.
All trouble of nuclear power plant occurred from the loss of the electric power. Many brave people earned the expensive time.
I just pray that their brave people's work succeed.