In nuclear reactors, a neutron reflector is a component that reflects neutrons, reduces a coolant flow bypass, and serves as a thermal and radiation shield of a reactor core.
A nuclear reactor is a device used to start and regulate nuclear chain reactions involving fission or nuclear fusion. Nuclear power plants employ nuclear reactors to produce energy, and they are also used in nuclear propulsion for ships. Nuclear fission transfers heat to a working fluid (such as water or gas), which then drives steam turbines.
These either turn the shafts of power generators or propellers of ships. In theory, district heating or industrial process heat can both be produced by nuclear power. Some reactors are used to make weapons-grade plutonium or isotopes for use in industry and medicine. There were 226 nuclear research reactors and 454 nuclear power reactors operating worldwide as of the beginning of 2019.
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