You didn't adress that. When I worked at SRP Dupont (one of the leaders in chemical plant safety) bragged about how safely it ran the plutonium facilities there. Years later a massive cleanup is needed. This is not because waste can't be contained safely, but rather that it takes a big effort to do so and human nature being what it is the long term effects of a few slackards are not good.

I fight a daily battle to get operators to follow the procedures they know they should. It's a lot better in an automated facility, but there are always instrument failures and failures of humans to cope appropriately.

Regards,
Mark