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The most common coolant used in nuclear reactors is water. There are light water reactors (using "regular" water), and the heavy water kind of reactor.
No, nuclear fission operates all nuclear reactors. If they are power plant reactors it is used to generate electricity.
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).
The nuclear fission reactors used in the United States for electric power production are classified as "light water reactors" in contrast to the "Heavy Water Reactors" used in Canada. Light water (ordinary water) is used as the moderator in U.S. reactors as well as the cooling agent and the means by which heat is removed to produce steam for turning the turbines of the electric generators.
A boron/steel alloy is normally used, boron is the element that absorbs neutrons strongly. Cadmium is sometimes used but I think only in small research type reactors.
Well, as nuclear reactors are nuclear reactors, nuclear reactors are not used inside nuclear reactors.
It depends. Pressurised water is used in pressurized water reactors (PWR), but molten salt (maybe fluoride?) reactors are said to be better.
The energy production in nuclear reactors. The atomic bombs used in World War ll. Apex.
It could be used with light water reactors.
Heavy water is used in nuclear reactors as moderator for neutrons.
Yes, uranium is a nuclear fuel for nuclear power reactors. Also uranium can be used in nuclear weapons.
Current nuclear reactors rely on nuclear fission as their nuclear reaction.