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The reason for having many reactors is because you can produce more electrical energy from them. Also Japan use BWR type reactors(Boiling Water Reactor) which are not as efficent as a more commonly used PWR reactor(Pressurized Water Reactor).
During the Fukushima Daiichi nuclear disaster in Japan, three of the reactors experienced hydrogen explosions. These explosions occurred in Reactors 1, 3, and 4.
No, Hawaii is currently not in danger of radiation from the incidents involving the nuclear reactors in Japan.
The tsunami destroyed many buildings and damaged nuclear reactors
Before the Fukushima Daiichi Disaster, there were 54 operational nuclear reactors in Japan. Three of those melted down, and one had problems that rendered it inoperable. The government has decided the other two reactors at Fukushima Daiichi cannot be restarted. Also, as other reactors have been shut down for maintenance or refueling, they have not been restarted, with the result that now, in early December 2011, only eight Japanese reactors remain in operation.
the cause of the melt down of the reactors in japan is the water that is needed to cool down the reactors
The tsunami that hit Japan wiped out the cooling systems for the reactors at the Fukushima Daiichi power plant. The reactors are currently overheating and releasing dangerous amounts of radiation into the atmosphere
Though Fukushima has lost 4 of its Nuclear Reactors, There are many more Nuclear Reactos running in Japan, Secondly Japan is mostly using Coal and Gas to compesate for fukushima.
I assume they dropped borated sand in the reactors.
It is impossible to build ANYTHING in japan that is not on a geological fault. That is how the islands formed.
Most nuclear reactors are thermal-neutron reactors. A few fast breeder reactors have been built, but not many.
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