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Lean philosophy is supposed to account for those dice-rolling moments. It’s not just “keep nothing in inventory”, there is supposed to be risk assessment involved.
The problem is that leadership doesn’t interpret it that way and just sees “minimizing inventory increases profit!”
Modern reactor design also pretty much makes runaway reactions nearly impossible, as in, you have to actually try to fuck it up.
Even Fukushima didn’t have a runaway reaction, it just lost coolant.