And, for the 'Eval'(s). You will get tested daily, weekly, monthly and throughout your entire Nuke Schooling to determine your fitness for duty as a Nuke. They will push your buttons to evaluate you during your stay. You will be evaluated regularly.
I think you guys are talking about the old program.
In 2005 in Charleston we had a student come to NPTU with a 2.48 GPA out of Power School (strange, the training pipeline standard is "two-five stay alive" and the fleet standard is 2.

. Either standard you hold him to, this kid failed out of power school and there he was in prototype. I feel bad for him because, even though I realize the Navy nuke community isn't the exclusive community it claims to be, he had no place in the pipeline. He was one of those people with the muddy, glazed over look in the eyes that made you wonder if he was actually self-aware. He didn't know how to put gas in his car, didn't know THAT he had to pay bills, let alone how to do it. Slept on the floor in his closet with no furniture but 500 DVD's. I believe he was a good person, though (RHRB - Right Horse Wrong Barn - I should add that to the nuke glossary thread). He didn't get kicked out until about week 20 (Prototype is 24 weeks nowadays -- for you old timers).
Strange thing is, he wasn't actually going to get kicked out. They sent him to the Corrective Custody Unit in Jacksonville for being a dirt bag (which I don't actually believe he was), and when he got back they put him on a paint team while awaiting a class-up. While on paint team he crossed one of the Rad Area lines under the turtleback over the RC with no TLD. That actually got him sent away. It's kind of a shame, though. Once accepted into the program you can't be dumb, just CAN'T be. That means that if you fail out of power school and can't get the grasp on a single concept in prototype or if it is just in question wether or not you are a sentient being, you just aren't trying hard enough.
Fortunately, though, the boats are still a true test of character and resolve

You've always got some lean, mean, nub-hatin' machine to act as the ship's Quality Control Petty Officer. I just don't know that it's the boats' responsibility to determine who is cut out to be on them. From what I understand when you old fellers went through, the pipeline was designed to filter out those that couldn't have been nukes. I'd bet that while the schools had a higher attrition rate, the fleet had a lower attrition rate. Seems like a decent way to save money on training. You probably had a lot fewer dirt bags actually make it to ships as well.
Ah, such is life.