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The paper outlines the development of the design of the electrical auxiliary systems at the CEGB gas-cooled reactor nuclear power stations, in response to changes in their requirements with regard to nuclear safety. The changes in system design that have taken place are illustrated by comparing the systems at the earlier Magnox stations with the Advanced Gas-cooled Reactor (AGR) station at Hartlepool. The vital importance of protection against fire is noted, and the stringent fire protection requirements laid down for the later AGR stations are outlined. Further developments in the methods used for electrical auxiliary system design and evaluation, using quantitative analysis techniques, are discussed.