The bigger problem than the corrosion is the inability to inspect the system in an efficient way. In a regulated nuclear industry, not knowing the status of the system means it will not be allowed.
Given that the system has intrinsic safety built in, I'm not sure why regular inspection would be required.
Perhaps the NRC does require regular inspections for existing plants, but none of those existing plants are failsafe are they? If something starts to go wrong, it can snowball very quickly into a much worse situation.
With a MSR the worst-case scenario (short of terrorism) is that you empty into the dump tank until you sort the problem out and restart. If you make the entire facility's floor the dump tank then inspections are going to be rather redundant. Except perhaps to ensure that the dump tank is intact. But that can be made fairly easy I think.
I think there is a tendency to think of fuel rods as a problem rather than the solution to a problem, which is raw spent fuel is nasty. The cheapest and easiest way to deal with spent fuel is to store it for decades while the worst of the radio-isotopes decay. Fuel rod technology allows you to do that, a molten salt design doesn't. I'm okay with this argument but is seems to bother people that you can't recover spent fuel now rather than waiting 25 years so they cast about for solutions to what is really a psychological annoyance.
See the quest for reusable launch systems like the space shuttle.
The funny thing about nuclear waste is that it's not the "hottest stuff" you have to worry about. The hottest stuff has a very short half life and disappears relatively quickly. On the other side things like Carbon 14 that have a multiple millennium half life are not radioactive enough to cause much of a problem. It's the stuff that has a half life of about 10 to 1000 years that you have to worry about.
Perhaps the NRC does require regular inspections for existing plants, but none of those existing plants are failsafe are they? If something starts to go wrong, it can snowball very quickly into a much worse situation.
With a MSR the worst-case scenario (short of terrorism) is that you empty into the dump tank until you sort the problem out and restart. If you make the entire facility's floor the dump tank then inspections are going to be rather redundant. Except perhaps to ensure that the dump tank is intact. But that can be made fairly easy I think.