The primary cooling fluid circulating through a boiling water reactor is________________?
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Answer: C. mixture of water and steam
Explanation
In a boiling water reactor, the primary coolant circulates directly through the nuclear fuel core. The intense heat generated by fission causes the liquid water to boil and vaporize inside. This operational process produces a continuous two-phase mixture of water and steam. Operating pressure inside the reactor vessel is maintained to allow controlled boiling at high temperatures. The steam-water mixture rises through the core into steam separators located above the fuel assemblies. This direct steam generation cycle eliminates the need for intermediate heat exchangers.
The generated steam flows directly to drive high-pressure steam turbines in electrical power plants. Maintaining proper coolant mixture quality ensures adequate heat transfer and prevents fuel rod overheating. Reactor safety systems continuously monitor coolant levels to guarantee core coverage under all conditions. Carbon dioxide serves as a gas coolant in advanced gas-cooled nuclear reactor installations. Pressurized water reactors keep water under high pressure to prevent boiling in the primary loop. Liquid metal is used as a high-temperature coolant exclusively in specialized fast breeder reactors.
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- Engineering
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- Mechanical Engineering
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