Realistically, there is little to do besides decontamination which I'm sure they're equipped to do on site.

Anecdote: My house mate in grad school was working in a national lab when an experiment caught fire and the fire consumed a certain amount of radioactive material. (Tiny little buttons used for calibrating detectors). He was on shift and was the person who discovered the fire and pulled the alarm.

Among other things, he had to sit inside an enclosure made of scintillator material for a period of time, to make sure he wasn't contaminated. Then he also got blood tests for heavy metals etc. They pretty much went by the book for all of these tests.

Also, the facility is the only place that's equipped for this kind of situation.

It’s a process to come into a high radiation area, as well as, a process to come out; I’m sure the worker was not injured so they processed he/she out and decontaminated the individual and did a whole body count. Then release him to medical for evaluation…which in itself is a process.

Almost certainly a refueling outage, this video will give you a good image of it

https://www.youtube.com/watch?v=IoCfapqYy00