The term "red badge" sounds like a local jargon used at some particular plant or another. What you really need is unescorted access and whatever training the site requires before they will admit you to work -- GET, Radworker, ... etc.
Normally, this process starts after you are hired.
However, if you are local to one of the Illinois Exelon plants, some of the trades offer their members the opportunity to take this training during the slow periods while they are unemployed. Call your BA and ask him if they have such a program in place for you. If so, they can send you to the training center to complete the training in anticipation of hiring you out to a broker at outage time. If you are thinking of traveling into another local for work, they may have such a program that your BA may know nothing about - so you might have to get in touch with the BA at that local for info.
This process is not available everywhere, but it provides a pool of tradespersons who are ready to hire when outage time comes around, and alleviates the bottleneck of trying to train hundreds of people in the week before the outage starts.