Dude, Chernobyl reactor by design was nuclear bomb.
P.S. My father (still alive) was one of thousands of common liquidators of Chernobyl disaster from May to July 1986. Many of his coworkers, that lived with him in same tent, already dead.
Chernobyl was not quite a "nuclear bomb" in the sense that Pripyat isn't a charred crater. Nuclear reactors, when they fail, just spread their radiation all over.
