Accordingly, it is virtually certain that the regulators will demand a
containment building for a commercial tokamak
reactor that will likely resemble what is currently required for fission
reactors, so as to protect the public from normal - going superconducting magnet energy release.
Although radiation leakage has been reported, the
reactor core
containment is said still to be intact, But if the cooling operation is not successful then there is a risk that, aside from the (hopefully low) possibility of a explosion as at Chernobyl, or a hydrogen explosion (as was feared at one time at Three Mile Island in the USA), melting fuel could burn through the core and the floor of the
reactor building and enter the soil, a risk that would be heightened if the floor structure was cracked by the earthquake.