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Sellafield isn't an ordinary nuclear power station. It was part of the UK's nuclear weapons program and contained some of the UK's earliest (maybe the earliest) nuclear reactors.

It's not going to be representative of the decommissioning costs of modern generation II or generation III reactors.

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It's also the site of one of the most ridiculous nuclear accidents in history: https://en.wikipedia.org/wiki/Windscale_fire

Regardless of how much one is for or against nuclear power, i think we can all come together and agree strongly that building an air cooled nuclear reactor that uses a flammable substance as a moderator and blows exhaust out a chimney is a catastrophically bad idea.

And I don't imagine that kind of activity results in easy cleanup.

Also, AGR fuel needs to be condensed or reprocessed shortly after discharge. It's great in a gas reactor, not so much in a spent fuel pool. That means much of the UK's discharged fuel as been consolidated at Sellafield. But all that plutonium is a great fuel resource. Jealous of whoever gets to fuel their reactor with that goldmine.

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