How meltdown can occur

In addition to the enormous devastation from the earthquake and tsunami, Japan has got a nuclear accident in his hands. The lack of cooling has increased the pressure and temperature inside the steel container dramatically. When the temperature exceeds 500 degrees, the water will oxidize zircon metal and produce large amounts of hydrogen gas inside the reactor tanks. It must be vented out to prevent that the pressure should rise further. At this temperature also weakened zircon metal that causes discharge decomposition in the form of gases from the fuel inside the tubes. Radioactive gases such as xenon, krypton, radioactive iodine and cesium are provided when the pressure is released from the reactor core. (AG)