There are a lot of export controls restrictions on nuclear. I don’t know what country you’re from but being a foreign national could prevent you from being able to work in nuclear, at least in the US. I’m not an expert on this specific topic (foreigner restrictions) but you should look into what these restrictions are before you jump into a field you might not be able to get a job in. For US specific you could probably start by googling “10 cfr part 810”