Some early and some experimental reactors used sodium as the primary coolant.
Water (H2), or heavy water (D2O). Sometimes, liquid sodium is used.
Water is the most common coolant used to remove heat from a nuclear reactor core. In pressurized water reactors (PWRs), water is used both as a coolant and as a moderator.
Never a nuclear reactor is used in airplanes. However, it is used in submarines.
Sodium is an element and therefore in the strictest sense can not be made. However, in theory it could be made in a nuclear reactor.
The fuel used in a nuclear reactor is typically uranium. Specifically, the most common type of uranium used is uranium-235, which undergoes nuclear fission to produce energy in the reactor.
The pressurised water reactor (PWR)
fuel
A Nuclear Reactor.
Sodium is generally used in a type of reactor called a fast reactor, which relies on fast moving neutrons to operate Water cannot be used as a coolant because it slows the neutrons in the reactor too much, whereas sodium does not. As well, because sodium boils at such a hot temperature it does not require a pressurized cooling system unlike water cooling systems.However, unless required, most reactors will not use sodium as a coolant because it is a very reactive element, and as a result special safety measures in construction and operation must be observed.
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.
Typically, Uranium-235 is used as fuel in nuclear reactors.
No. LLNL even tested several Uranium-Hydride bombs in the 1950s. Even though their computer models said the devices should explode, none gave a nuclear yield. One could use the waste from the reactor as a Radiological Weapon, but the reactor itself is not useful as a weapon.