Ehhhh, those are the ancient light water designs. Fuck light water, even though it's actually pretty safe. Advanced sodium reactors are where it's at. One loop is molten salt and nuclear fuel. The salt makes it less dense so it can't melt down like a traditional reactor. A second loop of salt is what steals heat from the fuel, which loops around to a water boiler further away. In essence, it's airgapped. While corrosion can be an issue, the lack of water in the salt loops helps a ton.

Solar towers with molten salt generators also work in the same way. The salts are molten and continue pumping out power for 12 hours after the sun has set, which makes them an excellent source of power for cities :)

I'd live next to a nuclear plant any day of the week! Especially if the homes are less expensive because of it :D