Co-founder of Transatomic here.

I'm not sure what you mean with your first point, but your concern with corrosion was solved in the 1970s at Oak Ridge National Lab, where they operated a molten salt reactor for four years. That reactor demonstrated that extremely low corrosion with a high-nickel alloy called Hastelloy-N, which is similar to the metals widely used to handle other high-temperature molten salts in industries like aluminum refining.

You can find more information on corrosion and material compatibility in section 2.5 of our technical white paper:

http://transatomicpower.com/white_papers/TAP_White_Paper.pdf