There have only been two molten-salt fueled reactors in operation, the Aircraft Reactor Experiment and then the MSRE you linked to. Neither was hooked to the gr

There have only been two molten-salt fueled reactors in operation, the Aircraft Reactor Experiment and then the MSRE you linked to. Neither was hooked to the grid. You may be thinking about the Shippingport reactor which used solid Thorium fuel for a while. [1] As for corrosion, molten salt reactor chemistry is complicated but we think we understand most of the key issues, at least with flibe salts. When an atom fissions, it becomes one of hundreds of different fission products, and that's why the chemistry gets tough. Only a few are really bad actors though, from a chemical standpoint. [1] https://en.wikipedia.org/wiki/Shippingport_Atomic_Power_Station https://en.wikipedia.org/wiki/Shippingport_Atomic_Power_Stat...