Heavy-water reactor

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A heavy water reactor (HWR) is a type of nuclear reactor which uses heavy water (D2O, deuterium oxide) as a neutron moderator. It may also use this as the coolant, in the case of pressurized heavy water reactors. Due to heavy water's low neutron absorption cross section, HWRs can operate with natural uranium fuel.

Excerpt from the Wikipedia article “Heavy-water reactor”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Nanking2012, CC BY-SA 3.0, via Wikimedia Commons.