I heard two of the reactors already melted down, but it was contained. They have over 6,000 spent fuel rods from the last 40 years of use in unprotected pools. Pumps to cool the pools didn't work, so the water slowly evaporated, then what was left exploded into steam. Then the rods are still hot with radiation, so they can begin to burn and start fires. The soot from these particles are radioactive. So it seems to me the spent fuel rods pose more of a danger than the reactors themselves. We therefore need to build breeder reactors to use up this spent fuel to reduce the volume to 10% of what it was. I also think drilling deep into the earth as far as possible to dump what can't be reused would be a good idea.