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You're absolutely right, but the worst nuclear accident that can happen in third-generation PWR reactor is shutdown in case of total loss of external and internal power, and loss of coolant.
https://www.neimagazine.com/features/featurepassive-safety-in-vvers/
And you cannot run risk analysis in industry without *comparing* against alternatives, can you?
This is precisely why I highlighted the deep geologic repositories in Germany - they are there, they store cyanides, mercury, arsenic... yet nobody cares.