calandria

A calandria is a component found in certain industrial apparatus, most notably in nuclear reactors. In the context of a CANDU (Canada Deuterium Uranium) reactor, the calandria is a horizontal vessel that houses a cold heavy water moderator at atmospheric pressure. This vessel is penetrated by pressure tubes made of zirconium alloy, where the nuclear fuel is placed and through which a heavy water coolant circulates.1

Another definition of a calandria refers to a heating element within an evaporator, specifically a part of a vacuum evaporating system. In this type of calandria, the liquid being concentrated moves up through tubes that are surrounded by steam, and then descends through a central well.2