That's one advantage of molten salt reactors. The troublesome parts of a nuclear breach are fission product gases with medium half-lives: isotopes of strontium,

That's one advantage of molten salt reactors. The troublesome parts of a nuclear breach are fission product gases with medium half-lives: isotopes of strontium, cesium, and iodine. With an MSR, all those are chemically bound in the salt. Instead of radioactive clouds you just have molten salt that cools into hot rocks at the reactor site.