Dudes that wasn't a nuclear explosion at all. I've seen a video of it and yes, that was a hell of a bomb, but still a trifle compared to what an actual nuclear explosion is. A nuclear explosion doesn't kill some tens and wound some thousands of people. If that was an actual nuke, there wouln't be a city Beirut anymore. Everything around the explosion area would have vaporized and at least hundreds of thousands would have been anihilated.