That's not actually what the paper says. It just says that when you have one design, when you find a design flaw, it affects all the instances. Due to the safet

That's not actually what the paper says. It just says that when you have one design, when you find a design flaw, it affects all the instances. Due to the safety regulations, you then need to shut them all down until you've either fixed the problem or determined that's OK to restart. It's the risk of the monoculture. And it then lists some examples from existing nuclear plants. So it's not a new problem.