That is fun to know!
With regards to why the culture hasn't changed. To be honest nuclear power is really safe. We used to play little thought experiments on the boat about how we would get a meltdown to happen and it's hard
It goes beyond safety systems and automatic protective actions. The design of the cores themselves makes it so you have to jury rig a situation where you get prompt criticality (reactor criticality due entirely to prompt neutrons vice delayed+prompt; very very bad). Frankly operators are there for regulatory reasons; nuclear operations are so safe and formulaic you could run a 1GW plant with ~3 people total given all the available automations.
So why change the culture? The program has literally never had an incident in 70 years of operation. Not one fission product release in close to a century. We have no blood to write rules in.