Need for enriched Uranium: that is correct, though liquid fueled Th reactors are designed to operate as a closed system that breed and "burn" their own Uranium

Need for enriched Uranium: that is correct, though liquid fueled Th reactors are designed to operate as a closed system that breed and "burn" their own Uranium from the Th, starting from an initial supply of neutron flux to start the process. That source of neutrons, it's usually assumed, will be Uranium. LFTR designs breed U233 (as opposed to the U235 used in conventional "thermal" reactors). The people trying to revive liquid-fueled reactor development say that U233 is by far the most practical "starter" to provide the neutrons to start a reactor going. The US has a stockpile of U233, which would provide a significant advantage for in the US any race to develop the technology. Sadly, the US has a program costing hundreds of millions of dollars to destroy its stock of U233, thus throwing away that advantage, for dubious gain. Last I heard, they were due to have started by now. Video on the subject from the guy who did the excellent Thorium remix 2011 video (on skimming it seems it doesn't really explain why U233 is better than alternative neutron sources as a way to start the reaction): https://www.youtube.com/watch?v=-p49Sq7mbpE https://www.youtube.com/watch?v=-p49Sq7mbpE I don't think they're done destroying it: if you're a US citizen, I guess there's still time to write to your member of congress. "some problems similar to uranium reactors": I think you need to be much more specific for the comment to be useful.