Japan may require back-up emergency power at nuke plants

TOKYO - Japan's trade ministry is considering requiring nuclear plant operators to have backup emergency power in place to cool reactors and spent nuclear fuel pools in case an earthquake or tsunami knocks out external power supplies and existing emergency power systems, a ministry official said on Wednesday.
The official with the trade ministry's Nuclear and Industrial Safety Agency added that the government would address the issue urgently after the nuclear crisis at the Fukushima Daiichi plant.