Noun
A form of heat exchanger in which steam is forced past tubes which contain water to be boiled.
A thermosyphon reboiler.
(brewing) A heating element within a brew kettle.
Source: en.wiktionary.orgBecause these rods are inserted into the low-pressure calandria, not the high-pressure fuel tubes, they would not be "ejected" by steam, a design issue for many pressurized-water reactors. Source: Internet
It is also the practical reason for the calandria design, otherwise a very large pressure vessel would be needed. Source: Internet
If this process further weakens the fuel bundles, they will eventually bend far enough to touch the calandria tube, allowing heat to be efficiently transferred into the moderator tank. Source: Internet