I am very aware that in some places it's not what you know, but who you know.....
Obviously you know somebody as you need 5 years to sit for the NRRPT and based on your experience as you posted it here you barely have it now, so somebody you know went out on a limb for you concerning the 5 year requirement before you sat for the test.
....The problem with my current position is that two of the three supervisors are only in their position because they have been loyal (based on knowledge and leadership skills they should not be there).....
Again, based on time, you should not be NRRPT, I know for a fact there are a lot of people who would have a problem with that current situation. When the "who you know" pendulum swings in your favor and you take it, don't begrudge others when that pendulum works for them.
I couldn't care less, but, I may observe it, but I don't care.
Your self assessment is right, you do not have the experience, and working "some" outages is not going to make it happen. There are a lot of NRRPT, former NNPP, degreed people serving in the Health Physics and Radiation Protection discipline with decades of experience in front of you. Folks cognizant in REMP/RETS, Dose Reconstruction, Refueling, Large Component Removal and Inspection, ALARA, SSC, Instrumentation, Dosimetry, "Count Room", and too many others to bother listing. You are not going to beat out any of those people for a supervisor job based on merit, not until they all retire or leave the RP/HP workforce.
You will probably make supervisor within 5 to 10 years if you really want to because you're going to take the job for cheap and you do not have to actually be the best RP or HP type out there to be an effective supervisor. The "man" likes a cheap, effective supervisor, most times he likes a loyal, effective supervisor just as much. And there's really nothing wrong with that either, with guys like HouseDad et al backing you up you can only really screw up if they let you, and the vast majority are too professional to let that happen, even if you deserve it and a part of them wants to let it happen.
This was also knocked around a bit some time ago;
http://www.nukeworker.com/forum/index.php/topic,25273.0.html#topGood luck, it's good to have a goal,...