I know the intent, but the magical hour restrictions are pretty dumb. I get up at 3:40am to make it to work by 5:30am.....I'm consistently changing from days to nights....I work a stretch of 8/9 days....(4) 10 hours days....(1) day off then (4) 12 hour duty days. Yet, these don't trigger that magical number that some person in the NRC dreamt of. Plus it's backwards when you look at actual risk.
Security....most stringent, literally zero percent chance they ever have to display their skill and protect the plant from attack.
Operations, Chemistry, HP.....second most restricted, not sure why HP and Chemistry get lumped into this category. Operations is understandable.....they can actually SCRAM the plant or cause damage to safety systems.
Mech.....least restricted, yet they do the majority of the work involving heavy lifting, working on valves and other various jobs that involve a serious industrial hazard.
Contractor craft, unless they are working on a "safety system", they literally have no restrictions. Yeah....guys moving heavy stuff, welding, building scaffold.....they can and will work 20+ days straight during outage.
I've been off work for 4 straight days during my long change....yet I was still unavailable for overtime because of what I worked the previous 5 weeks. Unless you are gonna monitor what individuals do after their shift, the fatigue rule is nothing but an unnecessary pain in the ass. If the fatigue rule was based on personal safety I wouldn't have an issue with it, but it is not.