A Magnox reactor is a type of nuclear reactor that uses natural uranium as fuel and magnesium alloy cladding. It was developed in the United Kingdom in the 1950s and is known for its simplicity and reliability. The reactor operates at low pressure and uses carbon dioxide as a coolant, which helps to transfer heat generated during nuclear fission to produce steam for electricity generation. The name "Magnox" comes from the magnesium non-oxidizing alloy used to encase the fuel rods. These reactors were primarily used for electricity generation and also for producing plutonium for nuclear weapons. Although many Magnox reactors have been decommissioned, they played a significant role in the early development of nuclear power in the UK.