This can be used to blow up enemy ships (e.g E12)
Yes, the nuclear reactor can be useful when it comes to making nuclear weapons. Uranium can be lowered into the operating reactor and can be bathed in the neutron flux to become (through nuclear transformation) plutonium. Plutonium is ready to be shaped into the subcritical masses used in nuclear weapons.
Never a nuclear reactor is used in airplanes. However, it is used in submarines.
The key to the range and duration of the modern nuclear submarine is the nuclear reactor. The reactor generates heat through nuclear fission, and this does not use air (or the oxygen in it). The heat is used to make steam, and the steam drives conventional steam turbines. With a large power source and no requirement to be on the surface, the boats can stay down for an extended period limited only by the amount of provisions they can stow aboard prior to deployment.
At any of the 104 operating reactor plants. See www.nrc.gov for maps of all the sites
Steam from the nuclear reactor turns turbines. These turbines either turn the propeller directly or turn generators that produce electricity to power electric motors which turn the propellor.
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)
Cadmium rods are used as control rods in a nuclear fission reactor to regulate the nuclear reaction by absorbing excess neutrons. By adjusting the position of the cadmium rods within the reactor core, the rate of fission reactions can be controlled to maintain a stable and safe operating condition.
fuel
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.
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.
Typically, Uranium-235 is used as fuel in nuclear reactors.