Dounreay is a place on the north coast of Scotland, in Caithness. English speakers know the name because of the nuclear site that stood there. The best-known reactor, the one inside a big round building like a giant ball, stopped making power in 1977. Though actually, that was not the end of all nuclear work on the site; other reactors and research went on later, and the long job of taking the site apart is still what the name brings to mind in news and official talk. It is not a big city. People say the name when they mean that remote Scottish nuclear place, not a holiday town. It is a proper name, always with a capital letter.