Which British reactor is the AGR and uses CO2 as coolant?

Which British reactor is the AGR and uses CO2 as coolant?

• A. Magnox Reactor
• B. FNR Reactor
• C. Candu Reactor
• D. AGR Reactor

Answer: (D)

AGR stands for Advanced Gas-Cooled Reactor, a British design that uses carbon dioxide as the coolant. In an AGR, CO2 circulates through a graphite-m moderated core to remove heat, allowing the reactor to operate at higher temperatures and improve thermal efficiency. The fuel is uranium oxide enriched to a few percent and housed in stainless steel channels within the graphite structure. This combination—British, gas-cooled, and CO2 as the coolant—is what defines the AGR. Magnox reactors also used CO2 cooling, but they are not AGRs (they use natural uranium metal fuel and have a different design). Options like a Canadian design with heavy water or a fast-neutron reactor do not fit the British AGR profile.

AGR stands for Advanced Gas-Cooled Reactor, a British design that uses carbon dioxide as the coolant. In an AGR, CO2 circulates through a graphite-m moderated core to remove heat, allowing the reactor to operate at higher temperatures and improve thermal efficiency. The fuel is uranium oxide enriched to a few percent and housed in stainless steel channels within the graphite structure. This combination—British, gas-cooled, and CO2 as the coolant—is what defines the AGR. Magnox reactors also used CO2 cooling, but they are not AGRs (they use natural uranium metal fuel and have a different design). Options like a Canadian design with heavy water or a fast-neutron reactor do not fit the British AGR profile.