A nuclear reactor that uses water as the primary coolant and moderator, with slightly enriched uranium as fuel. There are two types of commercial light-water reactors--the boiling-water reactor (BWR) and the pressurized-water reactor (PWR).
The typical commercial nuclear power reactor. It uses ordinary water (light water) to produce steam. The steam turns turbines and generates electricity.
A reactor that uses natural water as a moderator and coolant, and low-enriched uranium as fuel. The most common type of power reactor currently in use. Must be shutdown to change fuel. See; Boiling-Water Reactor, Pressurized-Water Reactor, Reactor.