![]() ![]() Types of Light-water Reactors in the United StatesĪll commercial nuclear reactors in the United States are light-water reactors. The heat created by fission turns the water into steam, which spins a turbine to produce carbon-free electricity. ![]() ![]() The moderator helps slow down the neutrons produced by fission to sustain the chain reaction.Ĭontrol rods can then be inserted into the reactor core to reduce the reaction rate or withdrawn to increase it. Inside the reactor vessel, the fuel rods are immersed in water which acts as both a coolant and moderator. A reactor core is typically made up of a couple hundred assemblies, depending on power level. Typically, more than 200 of these rods are bundled together to form a fuel assembly. The uranium is processed into small ceramic pellets and stacked together into sealed metal tubes called fuel rods. ![]()
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