Its my understanding that the Bomber carrying this weapon was involved in an accident with the fighter and there was an actual decision made to dump the bomb before attempting a landing. It would certainly suck to have your Bomber (i.e. flying gas-tank) explode on the runway and scatter uranium around everywhere.
If this is the incident Im thinking about, whoever made those decisions gets 2 thumbs up from me.
You are correct.
In those days...SAC bomber pilots had checklists and air-control towers had them as well...and everyone went by the checklist (unlike today's fighter-pilot managers). It was a simple item on a checklist somewhere, and someone had sat down and thought about what to do. Under no circumstances would you land a damaged plane with nukes onboard. Its a absolute mixture for disaster.
As for what to do with the possible bomb...nothing. If you try to remove...you are tempting fate and will likely cause an accident.