If you don't have the answer yet, then I'll tell you. There are no structures that require uranium to build; uranium is used for ammo or for making energy. Instead, the green bar you see when building structures is dirium; to get dirium, you need to build a crucible, which I think you need titanium and steel for (the game should tell you what it requires). Then you can build stuff requiring it. Hope this answers your question!
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