Seaborg Technologies presented in Brussels on 2018-10-29.
"In the CMSR, fuel is mixed in a liquid salt that acts as coolant. This ensures it can always be cooled and it cannot melt down or explode. It will simply shut down by itself in case of an emergency. The importance of this is not only the safety but also a significant reduction in complexity and cost."
As Troels points out in his presentation, CMSR is unusual from other MSR designs as it is using a liquid moderator instead of graphite. I did try pry moderator details out of him and failed.
Troels mentions a follow-up talk on day 2 and I'll be getting to that. Haven't seen it yet myself, so hopefully all follow-up questions will be answered.