This is the real radiation problem.
pools, which sit on the top level of the reactor buildings and keep spent fuel submerged in water, have lost their cooling systems and the Japanese have been unable to take emergency steps because of the multiplying crises.
The threat is that the hot fuel will boil away the cooling water and catch fire, spreading radioactive materials far and wide in dangerous clouds.
The good news is that the Japanese have a relatively long time to deal with the problem.
bad news is that if efforts to deal with the emergency fail, the results could be worse.