uranium. When water is heated, it causes a chain reaction that turns the uranium to plutonium.
Nuclear Fission.Generally Uranium, but some reactors use Plutonium nuclear fission.
Nuclear energy from fission of U-235 and Pu-239
This happens in the fuel rods, the energy released by nuclear fission appears initially as kinetic energy of the fission fragments, which is quickly turned into thermal energy as the fragments slow down and are stopped in the fuel. Thus the fuel rods heat up and transfer thermal energy to the coolant, which in most reactors is water but can be gas or liquid metal.
It releases heat through absorption of the kinetic energy of the fragments of fission in the material of the fuel rods (talking of nuclear reactors, not weapons)
The nuclear fuel is found in the fuel rods. These fuel rods are formed into fuel bundles called fuel assemblies, and together they make up the reactor core.
Nuclear Fission.Generally Uranium, but some reactors use Plutonium nuclear fission.
Nuclear energy from fission of U-235 and Pu-239
Fuel rods are the nuclear fuel in a nuclear power plant. They are used to turn water to steam, which is then used to turn a turbine. They do not "generate energy", since energy cannot be created or destroyed (E=mc^2). They are used to generate electricity, or to convert nuclear energy to electric energy.
as it still has energy in it.
In a nuclear reactor the nuclear energy released by fission appears as heat in the fuel rods, which is then transferred to the reactor coolant (ie water in PWR and BWR)
This happens in the fuel rods, the energy released by nuclear fission appears initially as kinetic energy of the fission fragments, which is quickly turned into thermal energy as the fragments slow down and are stopped in the fuel. Thus the fuel rods heat up and transfer thermal energy to the coolant, which in most reactors is water but can be gas or liquid metal.
It releases heat through absorption of the kinetic energy of the fragments of fission in the material of the fuel rods (talking of nuclear reactors, not weapons)
The nuclear fuel rods in the BWR design in Japan are about 12 feet long.
Water is pumped around the fuel rods.
You are under a misapprehension about 'finding' nuclear energy. The uranium is found in a natural ore, mined and refined, and then made into nuclear fuel in the form of fuel rods. At this stage there is no nuclear energy being released, except for a small amount of natural radioactivity which is trivial. It is only in a nuclear reactor that a nuclear chain reaction is produced and energy is released because U-235 is being fissioned. This appears as heat in the fuel rods which is then used in a normal power plant steam cycle.
fuel rods and control rods
The fuel rods used in a nuclear reactor are made from uranium 235(U-235).