http://search.japantimes.co.jp/cgi-bin/nn20110515x1.htmlHigh radiation readings taken in the No. 1 reactor building the night of March 11 suggest it was the quake rather than the loss of cooling that critically damaged the Fukushima No. 1 power plant, a utility source said Saturday.
The belated disclosure could trigger a review of quake-preparedness at nuclear facilities across the country. Many have been focusing on increasing defenses against tsunami, which knocked out the plant's poorly placed emergency power generators.
The Nuclear and Industrial Safety Agency has so far said the reactor withstood the shaking and that the unexpectedly large tsunami caused a station blackout, which led to explosions.