A pressurizer is a key component in pressurized water reactors (PWRs), a type of nuclear power plant. Its primary function is to maintain the pressure of the primary coolant system, which is essential for the proper operation of the reactor. In a PWR, water is used as both a coolant and a neutron moderator. The system operates at high pressure to prevent the water from boiling, even though it is heated to high temperatures by the nuclear fission reactions occurring in the reactor core.
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