Thorium based reactors by definition are immune to core meltdown.
However its spent fuel rods is no less hot than other types of fissile material for initial few weeks and months.
Unlike other fuel cycle, however Thorium fuel spent rods have actinides with much longer half cycle for strong Gamma ray radiation, that requires remote robotic handling for re-processing. However some new physical processes have been invented (ultrasonics) that reduce the half life of those actinides by many orders (i.e. 100 to 1000 times). That invention makes Thorium a very good low mining foot print source of clean energy, that is also proliferation resistant (to lay Abduls as well as any country other than top 10 nations which are already in NSG and India (but not Saudi Arabia, Libya, Iran or Pakistan). Not to mention many time larger total available energy from Thorium from global reserves.
However its spent fuel rods is no less hot than other types of fissile material for initial few weeks and months.
Unlike other fuel cycle, however Thorium fuel spent rods have actinides with much longer half cycle for strong Gamma ray radiation, that requires remote robotic handling for re-processing. However some new physical processes have been invented (ultrasonics) that reduce the half life of those actinides by many orders (i.e. 100 to 1000 times). That invention makes Thorium a very good low mining foot print source of clean energy, that is also proliferation resistant (to lay Abduls as well as any country other than top 10 nations which are already in NSG and India (but not Saudi Arabia, Libya, Iran or Pakistan). Not to mention many time larger total available energy from Thorium from global reserves.