> common MSR talking point

Well, a lot of 'common MSR talking points' are overblown, firmly detached from reality. Or at least conveniently ignoring all the significant challenges remaining in industrializing MSR technology. MSR fanboys are the most tedious of the pro-nuclear side of the energy debate, perhaps beaten only by the "this entirely unproven aneutronic fusion concept will imminently solve all our energy woes" crowd. :)

This is why I refer to Helion as the "least dubious" fusion concept. :)

Moltex Energy talks a lot about that. It is actually pretty nice, some things stay in the salt, some leave it. The most dangerous stuff that shows up in the news a big scary cloud coming over from Japan to the US would still be in the salt.

Some other things that you really don't in your fuel, like Xenon and Krypton will bubble out.

So I think overall it is an advantage.

Moltex's design keeps the relevant isotopes of Xe/Kr in the fuel tubes long enough for them to (mostly) decay, so the Cs and Sr produced from the decay (mostly) stays in the fuel salt.