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<\/figure>\n\n\n\nA pressurized water reactor means water cannot boil around the fuel elements because they are under high pressure. It runs with three separate isolated circuits. A primary, a secondary circuit, and a third circuit. The temperatures and pressures mentioned here are just examples and may vary depending on the design of the PWR.<\/font><\/p>\n\n\n\n The primary circuit<\/strong><\/p>\n\n\n\n First, water is pumped under high pressure to the reactor core, where the nuclear fission process heats the water from about 290\u00b0C to about 325\u00b0C. Because the water in the reactor is kept under high pressure of about 160 bar, it does not boil to steam but remains a liquid. The pressure is controlled by a separate pressure vessel connected to the primary circuit<\/font>.<\/font><\/p>\n\n\n\n Water from the reactor core flows to the steam generator, giving off its heat through pipes. The nuclear water flows back to the reactor to be reheated, repeating the process.<\/font><\/p>\n\n\n\n