Government spokesman Yukio Edano said the explosion destroyed the exterior walls of the building where the reactor is placed, but not the actual metal housing enveloping the reactor.
That was welcome news for a country suffering from Friday's double disaster that pulverized the northeastern coast, leaving at least 574 people dead by official count.
Text: AP
Image: In this video image taken from NTV Japan via APTN, smoke rises from Unit 1 of Fukushima Daiichi nuclear power plant in Okumamachi, Fukushima prefecture on Saturday, March 12, 2011.(Photographs copyright AP)