Boiling water reactor
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A boiling water reactor (BWR) is a type of light water nuclear reactor used for the generation of electrical power. It is the second most common type of electricity-generating nuclear reactor after the pressurized water reactor (PWR), which is also a type of light water nuclear reactor.
Browns Ferry Unit 1 drywell and wetwell under construction, a BWR/4 using the Mark I containment. In the foreground is the lid of the drywell or primary containment vessel (PCV).
Light-water reactor
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The light-water reactor (LWR) is a type of thermal-neutron reactor that uses normal water, as opposed to heavy water, as both its coolant and neutron moderator; furthermore a solid form of fissile elements is used as fuel. Thermal-neutron reactors are the most common type of nuclear reactor, and light-water reactors are the most common type of thermal-neutron reactor.
A simple light-water reactor
The Koeberg nuclear power station, consisting of two pressurized water reactors fueled with uranium
A pressurized water reactor head, with the control rods visible on the top
A nuclear fuel pellet