(My observations working for ENTERGY, not an I&C tech)
I&C takes TECH test, not the MASS. If you can't pass the TECH, you have no business in the nuclear field anyway. It's the easiest EEI test by far.
At union Entergy plants, IC techs started mid 20's, capped out low 30's. Job rotation you start as a "3", spend a year or two working, you move up accordingly. After 6 years or so you would become a "1" or "1/C" depending on where you worked.
Charlie has been to 1 Entergy plant... in the South.... last I heard he wasn't there any more.
at MY Entergy plant... in the North, an I&C Tech (union) starts just below 30, finishes at 40+ after 6 years, with a jump halfway. Planner is another couple bucks, seniority based for selection.
Southern Entergy is a different animal (regulated) and the pay is different, usually lower. Cost of living is also... MY Entergy plant is on the low scale for up North, by a buck or two.
Many of the I&C techs work plenty of OT, and are competent, respected workers. Couple of them are wicked smart. Few leave the dept, most seem happy, except when OT is forced.
Goodluck.