Scifi book with a sun in the background and 2 people in suits in the foreground

[u/ScubaSteve1616OldFag]

Hello all, a quick question for you. In my youth I remember reading a book that boiled down to a scientist/team of scientists achieve nuclear fusion, but it runs away from them and they need to stop it and it ends with a large area getting "glassed". I think the cover had a sun with 2 people in suits walking towards it. I would greatly appreciate it if anyone could tell me the name of said book as I would love to reacquire it. Thank you :)