I wish you luck with your career endeavors.
I just got hired at Limerick to begin an NLO class. My background is Navy, but at the testing center, there were Navy and Non-Navy mechanics, elecs, techs, etc.
I think hiring a cross section from an applicable body pool does a company well, not just focusing on Navy nukes and engineers.
The first step for you is passing the entrance exams namely the POSS and Basic Math and Science (BMST) for any Exelon operator candidate interview.
You send them your resume and if you get through, they will schedule a day of testing.
They will also send you a link to a practice POSS site via EEI.
Practice the tests just like the real deal: timed, at a student desk, etc. The BMST is 100 or so multiple choice questions (no calculator) sampling algebra, trig, geometry, chemistry, physics, mechanics, and electrical theory at the High School and Basic Craft level.
You will also get a practice BMST sent to you.
As far as education in lieu of experience, I suggest getting an A.S in Mechanical Technology, Industrial Engineering Tech, etc. Most of the nuclear engineering tech degrees we discuss here assume you are a navy nuke going in so most of the classes are waived in lieu of a few specialty classes.
Many larger community colleges have career technology centers and would be a good place to start.
Best of luck,
Jason