In another advance, emergency crews dumped 18 tons of seawater into nearly boiling storage pool holding spent nuclear fuel, cooling it to 50 degrees Celsius, Japan's nuclear safety agency said. Steam, possibly carrying radioactive elements, had been rising for two days, and the move lessens the chances that more radiation will seep into the air.
Added up, the power lines and sustained dousing bring authorities closer to bringing the Fukushima Daiichi nuclear complex, with its six reactors and spent fuel pools, under control. Officials and experts, however, have said days, even weeks would be needed to replace damaged equipment and vent any volatile gas to make sure electricity does not spark an explosion.