I believe it depends on the salt used and why a lot of research is looking at fluorine - floride salts don't dissolve in water and thus don't have the same risk

I believe it depends on the salt used and why a lot of research is looking at fluorine - floride salts don't dissolve in water and thus don't have the same risks. Another MSR design seeing a lot of attention is SSR which similarly doesn't use any chemically reactive materials. SSR is also interesting from a cost perspective as it's projected to cost half of a modern coal power station and almost a third that of a modern large scale nuclear construction putting it in line with solar plants that don't have batteries (i.e. much more cost effective).