I am an undergraduate student in nuclear engineering, and I wanna pursue a PhD in nuclear materials. I have research background in materials corrosion, but my undergraduate university doesn't have courses on materials science for nuclear engineering students. I have noticed that many professors in USA employed students with materials science background. So I am worried about my background and hesitated whether I should apply for nuclear materials. Maybe I should apply for thermal hydraulics since my university has extensive courses on that, but I have no interest in it. I am very interested in work of Dr. Was, and I have read lots of papers from his group. But someone has informed me that Dr. Was rarely takes international students. I have no idea what I should do, please help me, guys!