[chimera]

Chernobyl didn't have nearly the amount of fissionable material that exists at Fukushima.

Fissionable material is of no concern. It takes high energy neutrons to induce fission in fissionable material, and you could probably count on one finger the fast neutron flux present in a SFP. Thermal neutron fission is induced in fissile nuclei.

[Errant]

Fissionable material is of no concern.

LOL! That's what I was trying to get across to someone on another thread about thorium reactors.