First, you must know what it is you want to actually do in the world of fusion. In big experimental facilities of almost all kinds, engineers design, analyze and sometimes build hardware, equipment and facilities. Meanwhile, scientists usually collect and analyze the data and design/build some of the equipment, and technicians maintain / work on the facilities. (On larger facilities there are sometimes also dedicated operators, like at a power plant.) There's quite a bit of overlap depending on other stuff, but those are the rough division of tasks. So, first and foremost, make sure you are most enthused about the actual engineering work if you want an MS Nuclear Engineering! Do some homework into what all the various groups that work on the big facilities actually do. Find out which of those things you are most enthusiastic about. Then plan your future accordingly. Now with all that said, Florida is a decent school and you will have quite a few options with an MS NE from there. It may be a good idea to look more closely at the engineering department and see which professors' interests most align with your own. Good luck!