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I nice summary from Canada which gives some basics that apply to nuclear energy and power reactors.
http://www.nuceng.ca/igna/physicsfull.htm
http://www.nuceng.ca/igna/physicsfull.htm
Nuclear physics is a branch of physics that studies the properties and behavior of atomic nuclei, as well as the interactions between subatomic particles within the nucleus.
The main topics covered in "Nuclear Physics Notes: A Summary from Canada" include nuclear structure, radioactivity, nuclear reactions, and nuclear energy.
Nuclear energy is produced through nuclear reactions, specifically nuclear fission or fusion. In nuclear fission, the nucleus of an atom is split into smaller fragments, releasing a large amount of energy. In nuclear fusion, the nuclei of two atoms combine to form a larger nucleus, also releasing a significant amount of energy.
Nuclear physics has many applications, including in nuclear power generation, nuclear medicine, and nuclear weapons. It also helps us understand the fundamental building blocks of matter and the processes that occur within stars and other celestial bodies.
The potential risks associated with nuclear energy include the release of radioactive material, which can have harmful effects on human health and the environment. There is also the risk of nuclear accidents, such as the Chernobyl and Fukushima disasters, which can have catastrophic consequences. However, with proper safety measures and regulations, these risks can be minimized.