The world's first commercial-scale nuclear power reactor started up in 1956, in the UK, at the Calder Hall site, first of eight 50MWe gas cooled reactors (MAGNOX). The UK's civil program was also to include the construction of an experimental fast breeder reactor at Dounreay in Caithness, Scotland and Heavy Water Cooled Reactor at Winfrith in Dorset plus several other experimental reactors and fuel reprocessing plants. A fleet of 26 Magnox power reactors was built, followed later by 14 advanced gas-cooled reactors (AGRs), and finally a single PWR at Sizewell B in 1995, contributing in the late 1990s, around 25% of total annual electricity generation in the UK.
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