The Pressurized Water Reactor (PWR)

PWRs keep water under pressure so that it heats, but does not boil.
Water from the reactor and the water in the steam generator that is turned into steam never mix. In this way, most of the radioactivity stays in the reactor area.

Steam generated by the reactor is used to turn the turbine, which in turn powers the generator; the generator sends power to a transformer and from there to the switchyard and from there to the grid.
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