Differences between nuclear fusion meltdown
In a nuclear accident and the accident at the Fukushima nuclear plant in Japan, usually speaks often of the risk of core melt.
Nuclear fusion is the process in which two atoms are joined to form one single pass. This releases a lot of energy that could be harnessed to generate electricity. Unfortunately, these reactions can not be controlled well and much less to create nuclear power to produce electricity.
The energy produced by the fission reactions is obtained in the form of heat. Much of this heat energy is used to spin turbines to convert it into electricity. And likewise, be dissipated because the core does not overheat. So plants are abundant near water sources (rivers and seas or oceans).
The meltdown refers to the passage from solid to liquid. For most nuclear accidents such as Japan Fukushima or failed for various reasons the cooling system. So that the core begins to heat acomular and the temperature rises. All materials have a temperature world if exceeded be passed from solids in liquids, ie melt.
If the core is melted as is evident and can not contain any radioactive content, that at these temperatures, and is in the form of steam escapes everywhere. It's as if we put a plastic water bottle into the fire.
Therefore, the term fusion nuclear fusion when we refer to the term and the term melting together when we speak of a reactor core refers to the passage of state Só , lido to liquid melt.