I had read a few helpful forums on the pros and cons of going for a masters vs. phd in nuclear engineering. However, I am still confused about one thing. I am considering pursuing a career in reactor design (fission or fusion, will likely make another post to discuss this). Here are my questions: 1. Are the guys in national labs/universities/government organizations (e.g. NASA) making the primary contributions in this kind of work, or are private companies like Westinghouse/GE designing their own reactors? I specifically mean making models for everything in CAD, doing simulations to test if it will work, etc. 2. Regardless of the answer to that, are the people designing reactors typically PhDs? Or in other words should I go for a PhD in NucE if I plan on doing this kind of work? For reference, I am currently a sophomore undergrad so I still have plenty of time to decide.