Nuclear power is from the nucleus from the core of atoms (made of protons and neutrons), and there are two ways to make nuclear energy, fission when the nuclei of atoms split, and fusion when the nuclei fuse together.
Nuclear power plants are filled with uranium-235, to produce heat through nuclear fission, and the heat warms the reactor cooling agent, usually water to produce steam. The steam is used to spin turbines then that turn into an electric generator to create low-carbon electricity.
Uranium is a metal that is in all rocks, and it has several Isotopes, Urainium-238 makes most of the majority of uranium in the world but, it cannot produce a fission chain reaction,, but uranium 235 can, but it makes only 1% of the world's uranium.
To make natural uranium go under fission, it is important to do something called uranium enrichment. Once it is enriched, it can be used to fuel nuclear power plants for 3-5 years. After it is still radioactive and has to be disposed of.
Nuclear power is a really low-carbon source of energy, compared to coal oil, or gas. CO2 barely comes from these power plants, Nuclear reactors generate, and is close to 1/3 of the carbon-free electricity.
Nuclear energy is actually not that harmful to the involvement and it is vital to helping climate change goals.
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