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Electricity generation in a nuclear power plant is fundamentally based on the principle of converting nuclear energy into electrical energy through a series of energy transformations. At the core of this process is nuclear fission, which is the splitting of heavy atomic nuclei, typically uranium-235 or plutonium-239, into smaller nuclei when struck by neutrons. This fission process releases a substantial amount of energy in the form of heat, along with additional neutrons that can trigger further fission reactions, leading to a self-sustaining chain reaction under controlled conditions. The energy released in nuclear fission is far greater than that from conventional chemical reactions such as burning fossil fuels, making it a highly concentrated energy source. In a nuclear power plant, the fuel is contained in specially designed rods, known as fuel rods, which are arranged into assemblies inside the reactor core. The reactor core itself is housed in a pressure vessel, often surrounded by a biological shield to protect workers from radiation. Control rods made from neutron-absorbing materials like cadmium or boron are inserted among the fuel rods to regulate the rate of the fission reaction. By adjusting the depth of insertion of these control rods, the reactor operators can increase or decrease the number of neutrons available to sustain the chain reaction, thus controlling the reactor’s power output. The precise control of the fission reaction is critical for both efficiency and safety, as excessive neutron activity could lead to overheating or, in extreme cases, a meltdown. The heat generated by nuclear fission is transferred to a coolant, which is typically water, although other substances such as liquid _________ ________ __________ ________ _____ ______ _______.
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