There needs to be a law that all nuclear and nuclear-adjacent facilities have no connection to the Internet. The fact it's allowed is unbelievable.
I heard that once you put up a website on the public internet, it would immediately gets attacked by all kinds of scanners or other worse things. Not sure if it's true as I'm not a web guy.
Back in the day, I made the mistake of hooking up a fresh Windows XP (at least I think it was; pre-SP2) install directly to the internet. There was no firewall or NAT to protect me. The machine got pwned almost immediately.