I may be a little dated but I thought all on shift personell were first responders for medical, fire brigade, and other plant emergencies until EMTs, firefighters, or other emergency personell showed up. I had to certify as an EMT on shift and go through fire brigade training at a local University and this was as a Rad Shift Supervisor for Illinois Power. It is hard to imagine that shift personell are not expected to be capable of performing these functions, which would include climbing ladders, carrying injured personell, manning a 2 1/2 inch fire hose etc..
License aside I would think job requirements would dictate physical capability.
That's just my opinion, I could be wrong. D.M.