Worth Their Weight in Salt, Molten Reactors Hold Huge Potential
https://news.utk.edu/2021/01/08/worth-their-weight-in-salt-molten-reactors-hold-huge-potential/
"The FS-MSR containment walls are only required to contain a low-pressure internal environment when subjected to external seismic and impact stressors. Halide salts are chemically inert, so they don't have exothermic reactions with the environment (oxygen, water) as would hot sodium or hot zirconium."
I like this over the sodium fast reactors.