Definition of advanced gas-cooled reactor in US English:
 advanced gas-cooled reactor
(also AGR)
nounədˌvanst ˌɡasko͞old rēˈaktər
A nuclear reactor in which the coolant is carbon dioxide, with uranium oxide fuel clad in steel and using graphite as a moderator.
 Example sentencesExamples
-  An advanced gas-cooled reactor on the site is also undergoing decommissioning.
 -  The nuclear plant comprises two advanced gas-cooled reactors providing steam at high pressure and temperature to two dedicated 660 MW steam turbine generators.
 -  The historic costs of decommissioning British Magnox and advanced gas-cooled reactors do not bear comparison with the costs of decommissioning modern plants.
 -  Oxide fuel used in advanced gas-cooled reactors and light-water reactors can be stored safely for longer periods of time.
 -  The cracks were spotted in graphite bricks in the cores of all the company's advanced gas-cooled reactors, or AGRs. Collectively, they provide the country with nearly one fifth of its electricity.