The steam generator converts water into steam using the heat produced by the nuclear fission in the reactor core. It operates between the primary and secondary coolant (treated water) loops. The coolant is pumped through the nuclear reactor core, where it is heated and then pumped through the primary tube side of the steam generator before returning to the reactor core. This is referred to as the primary loop. That water flowing through the steam generator boils water on the shell side to produce steam in the secondary loop, which is then delivered to the turbines.
