> The biggest concern would be liberation of elemental fluorine Yep. But I'm personally more worried about the pelletized fuel. Pellets are not a great form-f

> The biggest concern would be liberation of elemental fluorine Yep. But I'm personally more worried about the pelletized fuel. Pellets are not a great form-factor, and they don't have cladding. Fluoride salts are also far more aggressive than water (mechanically and chemically), so this will limit the maximum specific power of the reactor. So I don't think that something like 1GW molten salt reactor is even possible. It might be OK if they want to continue using SMRs, though. > The slightly reduced salt is also preferred to limit corrosion Sidenote: that's actually not always a great idea. Steel is stainless because it's covered in a film of oxides, and without oxygen it might not be able to form. This is a problem for the Russian BREST-300 reactor that is cooled by molten lead, they had to do almost 10 years of research to perfect a system that controls the amount of dissolved oxygen in the molten lead. And it's still not clear if they succeeded until the full-scale reactor is built. In this case, though, I think that they can tune the reducers to react with fluorine preferentially, while still leaving enough oxygen.