Gas Cooled Reactors
GCRs are cooled with carbon dioxide and moderated with graphite. The core
consists of graphite bricks with coolant channels, in which the fuel elements
are contained. The core is confined in a steel or concrete pressure vessel. The
turbine is driven by a secondary steam-water circuit.
GCRs are designed for on-load refueling. GCRs are nearly exclusively operating
in Great Britain (Magnox reactors).