Chapelcross Nuclear Power Station. Chapelcross Nuclear Power Station, Annan, Dumfries, Scotland, seen through a tree. Commissioned in 1959, Chapelcross was based on Calder Hall, England, the world's first industrial-scale nuclear power station. The station has Magnox reactors which use fuel elements of natural (unenriched) uranium encased in an magnesium alloy (Magnox) can. Carbon dioxide gas is pumped through the reactor core, where it is heated by the fuel elements. The hot gas is then used to heat water, turning it into superheated steam, which drives the turbine generators.