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   ocr: ABSTRACT Light water reactors are a category of nuclear power reactor in which water is used as both a coolant and a mod- erator. There are two types of light water reactors: the pressurized water reactor and the boiling water reactor. In a pressurizea water reactor, steam is produced in a sec- ondary system. The main components of a pressurized water reactor are the core, control rods, reactor vessel, steam generators, and pressurizer. The core contains fuel assem- blies that contain fuel rods filled with fuel pellets. The coolant flows through the core where it is heated at high pressure. Th ...