In Canadium Deuterium Uranium reactor (CANDU), heavy water is used as?
In the name of the CANDU reactor, CAN stands for Canada, D stands for deuterium and U stands for Uranium. In a CANDU reactor heavy water is used as moderator, a coolant to cool down the machinery and as a neutron reflector that scatters back (or reflects) into the core many neutrons that would otherwise escape which reduces the speed of fast neutrons,