I don't believe that the design is fixed at this time. General Atomics and others have been working on designs and one has been built in South Africa, but the companies are still working out the final design. A link is provided to an interesting read on the latest evelopments.
The advanced gas-cooled reactors, at least the ones I know, have been built in the UK but not elsewhere. The last ones built were at Heysham Stage 2 and Torness, in Scotland. As far as I can remember the number of channels was 332. I think the first answer may have been on the pebble bed reactor, which is gas cooled and advanced, but not the same as the AGR in UK.
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An advanced gas-cooled reactor typically has around 2,000 fuel channels. Each fuel channel holds fuel assemblies where nuclear reactions take place to generate heat for electricity production.
The nuclear fuel is typically contained in the reactor core, which is a central part of the nuclear reactor where the fission reaction takes place. The fuel rods, which contain the nuclear fuel pellets, are inserted into the reactor core during operation.
Fuel cells in a nuclear reactor are the structural components where nuclear fission reactions occur, generating heat. This heat is used to produce steam, which drives turbines to generate electricity. The fuel cells contain the nuclear fuel (such as uranium) and control rods to regulate the nuclear reactions.
A fuel rod is a long, slender tube that contains the fuel pellets (usually uranium or plutonium) used in a nuclear reactor. These fuel rods generate heat through nuclear fission reactions, which is then used to produce electricity. Multiple fuel rods are assembled together in a fuel assembly to power the reactor.
A Thorium Molten Salt Reactor is a type of nuclear reactor that uses thorium as a fuel instead of uranium. It operates at high temperatures and uses a liquid fuel mixture of molten salts. One potential advantage of this type of reactor is reduced nuclear waste production compared to traditional reactor designs.
The fuel used in a nuclear reactor is typically uranium. Specifically, the most common type of uranium used is uranium-235, which undergoes nuclear fission to produce energy in the reactor.