ocr: Pre33u712e4-Nater Reactors PWR). The first First type of reactor is pressurized-water reactor was the submarine thermal reactor ascussed, built implies, in a Idaho in pressurized-water 1953, which the had reactor USS led is Hautllls. both directly AS to cooled the the and name first mosty in terms works. it of auclear-powered submarine, process-now moderated by water under high pressure, thus permitting high temperatures, The hot water is pumped from a pressurized vessel containing the nuclear core to a steam generator in which heat is exchanged to produce the steam that drives a turbogenerato ...