The nuclear core goes into a process known as 'meltdown' if it becomes too hot. For a reactor to reach critical temperature something serious has to malfunction, this could be a lack of water inside the reactor, pressure loss inside the reactor or no control rods inside the reactor, all of these faults could lead to severe damage to the reactor core and a possible lead to a thermal explosion(not a mushroom cloud explosion).
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One of the four reactors at Chernobyl
The solidified fuel and debris that melted in a meltdown is often called lava.
Worst case scenario, if the Japan nuclear reactors have a complete meltdown, then there is a possibility that the radiation can travel in the Jet Stream to the western coast of the U.S. To protect yourself from the radiation, iodine supplements are available at your local drug store.
Nowhere as far as I can find. Perhaps you are thinking of the 1986 Chernobyl steam explosion and graphite fire. This was in the USSR and although the graphite fire melted much of the core, it was not a meltdown in the usual sense associated with nuclear reactors.
One material that can be used to cool down a nuclear meltdown is water. It is commonly used as a coolant in nuclear reactors to absorb excess heat. Other materials like liquid sodium or helium may also be used in some reactor designs.
coz if nuclear meltdown it can explode
One answer is a bomb. But taking normal nuclear reactors, the result would ultimately be fuel meltdown, what happens after that would depend on the integrity of the pressure vessel and secondary containment
Nuclear reactors use nuclear fission.
I only know what is on public news, it seems to be Fukushima but there are several reactors there, not clear if all are involved
Nuclear reactors use controlled nuclear fission reactions to generate heat, which is then used to produce steam that drives turbines to generate electricity. The heat is produced in the reactor core where nuclear fuel rods containing uranium or plutonium undergo fission reactions. The reactor's cooling system helps regulate the temperature and prevent overheating.
The site of a nuclear twin reactor plant, in Pennsylvania. In 1979 one of the reactors suffered a partial fuel meltdown, which caused great concern in the nuclear industry, but in fact did not cause significant radioactivity to be released.