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I wonder if it would make sense to house these reactors in underground facilities to the extent possible to harden them against at least accidental threats?

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This was already done in Sweden [1] and is something the Swedish defence forces have suggested for the coming nuclear expansion in the country.

[1] https://en.m.wikipedia.org/wiki/%C3%85gesta_Nuclear_Plant

how do you cool them if they are underground?

That was a weird thought I had when the Japanese had problems actively cooling the destroyed Fukushima reactors: :Could one build reactors underground, so that in the case of need you can cool them by gravity alone without futzing around with diesel generators and high volume pumps?

(I'm sure there are 500 reasons why that’s a bad idea)

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