However, there is also the problem that the reactor inevitably becomes large due to the small thermal power density compared to the light water reactor. The new generation of GCR, the ACR (or advanced gas reactors), use enriched uranium as fuel. AGRs are using graphite as the neutron moderator and carbon dioxide as coolant. An advanced gas-cooled reactor (AGR) is a British design of nuclear reactor. As the aim was to operate at higher fuel, cladding and gas temperatures, it was necessary to change both material and design. AGRs were developed from the Magnox type reactor.These are the second generation of British gas-cooled reactors. The advanced gas-cooled reactor (AGR) was developed in the United Kingdom (UK) as a successor to the Magnox gas-cooled reactor. The heat capacity and thermal conductivity of the coolant gas is low, the necessary thermal output is ensured by increasing the gas pressure. The Advanced Gas Reactor (AGR) represents the generation II of British Gas-Cooled Reactors, developed from the earlier generation I Magnox reactor design (see “Magnox Design” on page 7) of gas-cooled reactors. Many Member States are interested in and developing advanced High Temperature Gas Cooled Reactors (HTGRs) that use helium as a coolant. Such reactors can achieve very high fuel utilization rates and operate at high temperatures. (See Magnox Power Station.) Disadvantages of the gas cooled nuclear reactor.
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