A bro (of any gender) who goes out of their way to spread the word about nuclear energy as a reliable, safe, and stable alternative to fossil fuel energy. They are ready and willing to debate anti-nuclear rhetoric and seeks out conversations to help dispel the veil of ignorance about nuclear power.
Dude 1: Hey have you talked to Nick today?
Dude 2: Yeah he sent me a meme about Nuclear power.
Dude 1: Ha yeah Nick is a total Nuclear Bro.
Dude 2: Bro has uranium fever man, #NuclearBro.