"Fukushima is going to dwarf Chenobyl. The Japanese government has had a level 7 nuclear disaster going for almost a week but won’t admit it.
Pouring concrete on a critical reactor makes no sense – it will simply explode and release more radioactive particulate matter. The concrete will melt and the problem will get worse. Chernobyl was different – a critical reactor exploded and stopped the reaction. At Fukushima, the reactor cores are still melting down. The ONLY way to stop that is to detonate a ~10 kiloton fission device inside each reactor containment vessel and hope to vaporize the cores. That’s probably a bad solution.
A nuclear meltdown is a self-sustaining reaction. Nothing can stop it except stopping the reaction. And that would require a nuclear weapon. In fact, it would require one in each containment vessel to merely stop what is going on now. But it will be messy.
The Japanese are still talking about days or weeks to clean this up. That’s not true. They cannot clean it up. And no one will live in that area again for dozens or maybe hundreds of years."