A nuclear reactorThe term nuclear reactor indicates an interaction between two or more nuclei, nuclear particles or radiation, which can cause nuclear-type transformations; includes, for example, fission, capture, elastic container. By reactor we mean the core and its immediate container. Nuclear reactors are used to produce electricity. The number of nuclear reactor plants has grown sufficiently. Electricity is generated in different ways, it can be generated using thermal energy. It can be employed using two basic systems, a steam supply system and an electricity generation system, these two systems are related to each other. The steam power system produces steam from boiling water by burning coals, and the power generation system produces electricity by spinning steam turbines. Nuclear power plants of this century depend on a particular type of nuclear reaction, fission (the splitting of a heavy nucleus such as the uranium atom to form two lighter "fission fragments" and less massive particles such as neutrons). In nuclear reactors this splitting is induced by the interaction of a neutron with a fissile nucleus. Under suitable conditions, a fission "chain" reaction in which events can be sustained. The energy released by fission reactions provides heat, some of which is eventually converted into electricity. In current nuclear power plants, this heat is removed from the nuclear fuel by water that is pumped past the fuel-containing rods. The key feature of the nuclear reactor is the release of a large amount of energy from each fission event that occurs in the nuclear reactor core. On average, a fission event releases about 200 million electron volts of energy. a typical chemical reaction, however, releases about one electron volt. The difference, roughly a factor of 100 million electron volts. Completely fissioning one pound of uranium would release about the same amount of energy as combining 6,000 barrels of oil or 1,000 tons of high-grade oil. The reactor cooling fluid serves a dual purpose. Its most urgent function is to remove from the nucleus the heat that results when the energy released by nuclear reactions is transformed by collisions into random nuclear motion. An associated function is to transfer this heat to an outer core, typically for the production of electricity. The designer envisions a nuclear core in a container through which a cooling fluid is pumped.