Actually the code that caused the crash no longer executes. That piece of code was an intentional crash in Gregtech that occurred when another mod tried to modify a GregTech recipe (as TC did). As soon as mDiyo noticed this, he removed the modification to GregTech. So now you technically can add GregTech back into unleashed, but it would be quite unbalanced due to, as you said, TC and GT not playing well together (you can dupe various ores). Not to mention, GT is not the mod you used to know - now it changes many aspects of gameplay in a serious way, from punching wood to crafting tools.
That said, like Digitally Apocalyptic said, Uranium Dust is no longer there because it's part of GT. Instead, you now directly compress your uranium ore into uranium ingots and use that in the relevant recipes.
Whatever you're trying to build, consult NEI to see your specific recipe, or if the block/item even exists. Chances are, if the wiki says it requires dust, it's probably a GregTech-only item and doesn't exist in Unleashed, since GT is not included.