[arethuza]

Yes, but the design of a nuclear power reactor and a nuclear weapon are pretty different - for a start the really nasty bit of most nuclear weapons is the fission of the secondary tamper by neutrons from the fusion component of the secondary.

Nothing like that happens in a nuclear power station.

[pjc50]

Nuclear weapons require the reactors, and a number were built for plutonium production e.g. Windscale/Sellafield. There are plenty of countries that probably shouldn't be allowed unsupervised reactors for this reason.