Calder Hall Magnox nuclear power station at Sellafield
Calder Hall (Trinidad and Tobago)
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CalderHall at Windscale, or Sellafield as the authorities renamed it in 1985, produced weapons-grade plutonium, but it was also the world's first commercial nuclear power station, connected to the national grid in 1956 after construction began in 1953.
The reactor at CalderHall was a prototype of the Magnox gas cooled reactor and over time three more reactors were constructed and operated successfully for 47 years.
CalderHall was closed down after almost 50 years, by which point it was the world's oldest nuclear reactor.
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