Ordinary light water
carbon and water.
Depending on the type and the power of the nuclear reactor. An example; a CANDU type reactor of 700 MW need 700 kg uranium-235 and only ca. 500 kg are "burned".
Heavy water
Reactor cooling water is potentially contaminated with radioactive elements and you don't want those to be released into the environment, so it is kept in the primary loop.
the boiling water reactor, pressurized water reactor, and the LMFB reactor
A reactor vessel in a boiling water reactor is approximately 300 tons.
PWR = pressurised water reactor. BWR = boiling water reactor
Different types of nuclear plants: Pressurised Water Reactor (PWR); Boiling Water Reactor (BWR); Heavy Water Moderated Reactor (CANDU); Advanced Gascooled Reactor (AGR); Fast Breeder Reactor (FBR); Pebble Bed Gascooled Reactor; Water Cooled Graphite Reactor (RBMK). There are other ideas that only exist on paper.
Water is used as coolant in most reactor plants to keep the reactor cool and prevent over heating. They do not necessarily need to be near a source of water; water just has to be available. However, a lot of nuclear reactors are build by a natural source of water so that the water can be used as an emergency source of coolant to keep the reactor covered with water in case of a rupture.
There are amny different types of reactors but the most commonly used ones are: PWR-Pressurized Water Reactor, this works by pressurizing the reactor allowing the water to boil at a much higher temperature allowing efficentcy to be higher. BWR-Boiling Water Reactor,this is the most basic type of reactor this reactor just boils water that turns turbines and produces electricity, however water levels and temperature have to be constantly monitored, otherwise a reactor could slip into a dangerous state. AGR-Advanced Gas Reactor, this reactor instead of being cooled by water it is instead cooled by pressurized carbon dioxide. FBR-Fast Breeder Reactor, this reactor instead of limiting fast neutrons to occur it allows fast neutrons in the reactor and in the act of doing it produces nuclear fuel that can be used to fuel the reactor.
The pressurised water reactor (PWR)
Reactor need power or no pulling no rods!
Pressurised Water Reactor (PWR), Boiling Water Reactor (BWR)
Water.
This is used in the nuclear reactor that is known as Boiling Water Reactor (BWR) in which heat produced by the nuclear fission in the nuclear fuel allows the light water reactor coolant to boil. Then, the nuclear reactor moisture separator is used to increase the dryness of the produced steam before it goes to the reactor steam turbines.
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