I am not sure where you are interviewing, but one of the biggest questions you should be asking is the status of the plants licence renewal with the NRC. Most plants initial operating licences expire sometime in the near future and, although some already have extensions, you should be wondering if an extension from the NRC to operate the plant longer is in the cards or not. The last thing I would want is to take an offer somewhere only to find out 3 or 4 years down the line that I have to pick up and move on. Just out of curiosity, where are you interviewing?