What leads to the nuclear disaster at Fukushima, Japan

Japan, the country in Asia popular of its fastest growing technologies, is suffering hard by the three way attack at the same time. Thousands of Japanese filled evacuation shelters or joined foreigners seeking a way out of the country Thursday in the aftermath of last week's devastating earthquake, tsunami and resulting nuclear crisis at stricken reactors.

Nearly 13,000 people are dead or missing and several hundred thousand have been left homeless from Friday's earthquake and tsunami. And the worst of it all was the meltdown and radiation leakage from its Fukushima nuclear reactors one following another. Fukushima Dal-ichi reactor located in the coastal Japan has 6 boiling water reactors out of which 3 reactors are already out of control.

In these reactors, the core creates steam-water mixture as a result of heating and this mixture leaves the top of the core and enters the two stages of moisture separation. Water droplets are removed and the steam is sent to main turbine causing to turn the turbine generator, that produces electricity.

But, Tsunami on friday destroyed the coolant system which pumped sea water to keep the nuclear fuel rods cool which leads to the meltdown and the nuclear crisis. It would have been stopped even after all this but due to the failure of back-up generator the plant went out of control. Since then ships and helicopters are pouring water on the reactors to cool the core but the temperature has risen to high level and the core is surrounded by the steam generated due to heating which in turn is failing the effort of controlling the nuclear crisis. Though as per the latest news, Japanese Govt. has stated that they have arranged an alternate power system to control the reactors which will start working by today.