CNN New Day With John Berman and Brianna Keilar March 4, 2022 11:09:00
The month of that disaster. you would see the failure of, say, the electricity or the pumping systems, the cooling system would no longer be cooling the rods. the rods would heat up dramatically, causing a thermal reaction that would melt the fuel rods that would probably melt the whole core of the reactor right through the bottom of the containment vessel thats there. you could see that result in this development of hydrogen gases inside the reactor, leading to an explosion of the hydrogen gas....
Source: archive.org