In the 20th century, the cooling water of pressurized water reactors was divided into two parts: the primary system and the secondary system:
Primary system cooling water was maintained at a high pressure level of about 160 atmospheres, so heating It can remain in a liquid state up to about 325 ℃. In order to absorb neutrons during nuclear fission, a little boron is added to water to adjust the speed of the nuclear reaction. The primary cooling water directly contacts the nuclear fission part, discharging the heat generated by it, and carries out heat exchange through the steam generator, so that the secondary cooling water is heated until boiling.
The secondary cooling water is heated to 275°C at 60 atmospheric pressure and becomes steam used to drive the steam turbine for electricity generation.
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