No, not really. A ‘meltdown’ is not really nuclear fission oriented. It is HEAT oriented. Reactor fuel, after shut down, and sub-critical- generates heat from decay of radioactive fission products, hence the need for post shutdowwn cooling and fuel pools.
I understand that- but it generates its own sustained heat from the critical mass.
If that melting stuff was seperated it would no only dissapate all that heat but go below critical mass.
All the ‘meltdown’ scenarios depict the blob of melted matter staying together until it melts to the core of the earth. - and when it hits the water table the steam and possible pressure build up would be catastrophic
I am wondering it it would spread out and cool itself down