An AGR (Advanced Gas-cooled Reactor) is a type of nuclear reactor that uses carbon dioxide gas as a coolant and graphite as a moderator. The core of an AGR reactor is the central part of the reactor where the nuclear reactions take place.
The AGR reactor core is designed with a hexagonal structure, with fuel channels running through the core. The fuel channels contain fuel elements made of uranium dioxide pellets, which are surrounded by graphite blocks. The graphite blocks also act as a moderator to slow down the neutrons and control the nuclear reactions.
The AGR reactor core is the heart of the nuclear reactor and is responsible for producing heat through nuclear reactions. This heat is then used to generate steam, which drives turbines to produce electricity.
The temperature in the AGR reactor core is controlled by adjusting the flow rate of the carbon dioxide gas coolant. The gas is pumped through the core at high pressure, absorbing heat from the nuclear reactions, and then cooled in a heat exchanger before being recycled back into the core.
The AGR reactor core is designed with multiple safety features, including control rods that can be inserted to stop the nuclear reactions, a containment structure to prevent the release of radioactive material, and emergency cooling systems in case of an accident. Regular inspections and maintenance are also carried out to ensure the safe operation of the core.