
@Angie Corium may be in the big torus / suppression chamber, or somewhere on the basemat, (green). I believe that regardless, there is water there too. Apparently it will take a lot to make it through the basemat, especially if it's all underwater as well.
nei.cachefly.net

@hudebnik Apparently the basement floor (green) is meters thick as well. It seems the corium shouldn't just slip down those giant tubes...
www.beyondnuclear.org

If the Corium has taken a detour into the S/C... trouble, and 200 Sv seems to indicate such, no?
www.martinfrost.ws