Senior reactor operator here.
Some of these divers are freaking crazy. I had divers in our service water pit next to pumps which could emergency start any time and they were chill. They swim up in pumps and impellers and stuff for inspections. The ones in the reactor are tethered up so we can pull them out and keep them in low radiation areas.
So when a diver says he doesn't think something is safe, everyone listens to them lol.
IIRC, most of the radiation (alpha, beta, and fast neutrons, but not gamma) from the nuclear fuel is stopped by just a few inches of water, and you could swim totally naked at the top of a nuclear reactor cooling pool and not absorb any significant amount of radiation.
Piece of piss. I once had to dive into the adjacent pen of a riled up, 10-foot bottle nose dolphin named Khyber. I'd go into a nuclear cooling system any day before doing that again.
What does a job like that pay? The guy that climbs those giant towers to replace a light bulb gets 20k twice a year. This seems more dangerous, underwater welding is dangerous enough but in a nuclear reactor? How do they get the wetsuit over their gigantic balls? Do they have someone behind them or an underwater Rover holding them up? Just curious.
There are also workers who don't dive but who do maintenance on cooling systems. They don't go underwater but often do walk in water that's radioactive enough that permanent employees aren't normally allowed to do the work -- everybody is temporary. They're supposed to do the work only once in a lifetime, but apparently some people have used phoney IDs, and one person even had a t-shirt that said, "Nuclear Migratory Worker".
“I’d like to buy some life insurance.”
“Sure, I’ll just need some personal information. What do you do for a living?”
“I dive into the water of the cooling systems of nuclear reactors... Hello? Hello?”