Do a search for refuel / reactor technician here on NW - y'know, the GE / W folks that come in and take apart the reactor and move the fuel. There have been some posts about it - and some SMEs are here too.
Don't expect to make the money you are making now in 4 months of outage work. That life on the road ain't as easy as it looks - living expenses, hotels, sleep deprivation, etc are a part of it. Being away from home wears you out.
Sounds like you are not challenged where you work. Start working on a degree if you don't already have one. If you have a degree, look around your company job postings - Engineer, project coordinator - those are challenging.
OPs is mostly shift work. Even in other companies - fossil, chemical, etc. Even load dispatcher is shift work. Power generation is a 24 hr a day job.
You didn't mention your background - Navy? College? brother in law? - all of these can help with changing the path of your career.
Good luck