The advanced gas-cooled reactor, or AGR, is a type of nuclear reactor designed and operated by the United Kingdom. It is the second generation of British gas-cooled reactors, using graphite as the neutron moderator and carbon dioxide as coolant. A prototype, the Windscale AGR, became operational in 1962, and the first commercial AGR came online in 1976; the design typically produces around 1,500 megawatts of thermal power and 660 megawatts of electrical power.
Facts
Classification
MaturityTRL 9: Actual System Proven in Operational Environment 1 Technology TypeSecond-generation gas-cooled nuclear reactor 2 Invented Year Sources
1. Advanced gas-cooled reactor - Wikipedia
Technology maturity, Wikipedia introduction extract fetched 2026-09-25Quote, Technology maturity, Wikipedia introduction extract fetched 2026-09-25
They have been the backbone of the UK's nuclear power generation fleet since the 1980s.
2. Wikipedia: Advanced gas-cooled reactor
WikipediaAdvanced gas-cooled reactor, lead section, operational-date sentence
The prototype Windscale Advanced Gas Cooled Reactor became operational at Windscale in 1962
Advanced gas-cooled reactor, lead section, classification sentence
These are the second generation of British gas-cooled reactors, using graphite as the neutron moderator and carbon dioxide as coolant.
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