If the warhead had damaged the fuel tank there would have been an explosion, and the radioactive materials in the bomb would have been spread around the site. I

If the warhead had damaged the fuel tank there would have been an explosion, and the radioactive materials in the bomb would have been spread around the site. It would have looked like the Palomares explosion, and that was a mess: https://en.wikipedia.org/wiki/1966_Palomares_B-52_crash https://en.wikipedia.org/wiki/1966_Palomares_B-52_crash There was an incident (this one: https://en.wikipedia.org/wiki/1980_Damascus_Titan_missile_explosion https://en.wikipedia.org/wiki/1980_Damascus_Titan_missile_ex...) when a serviceman dropped a spanner while working on a missile. There was a fuel leak and an explosion, thankfully the warhead was thrown clear of the silo by the blast.