Anybody with even the slightest knowledge of atomic weapons can tell you what a load of cack this story is.
Bombs are not made from Uranium, they are made from Plutonium/Beryllium alloy.
There has only ever been one bomb made from Uranium, that was the one dropped on Hiroshima. It used-up a huge amount of the material and was hopelessly inefficient. The (very first) bomb which preceded it was made from Plutonium as also was the one dropped on Nagasaki and to the best of anyone's knowledge every single bomb made since!