Ops though out duke is treated fairly well. Its some what regimental with the required initial training and continuing training annually. Once an NLO reaches around 4 to 5 years in the plant and gets the prerequisites out of the way you may be selected for license class. I have heard at times this selection is somewhat political if you know what I mean. After some time as an Licensed RO you may be selected for SRO class.
I have worked in RP for Duke for some time and as a company I have not been overly satisfied but it pays the bills.
As for the plants you mention. Ever seen an Ice condenser
??
The other issue with CNS is Duke does not own it, they own part of it and operate it but a lot of the money calls come from the other owners and at least in my perspective has created a bit of an attitude about trying to get something improved.
Catawba does however seem to out preform Oconee on a more consistant basis at least with INPO
Hope that helps
sf