Naw, thats dumb. Its because the Japanese are still able to control the flow of information, unlike here. They clamped down on this hard, and the fact that it was in the midst of a national disaster made it easier.
Document shows high-profile nuclear experts under Japan govt surveillance
Note - That above link is to an anti-nuke site. They frequently over hype situations, but you can find decent breaking news there sometimes. Also, some of the reports there are straight Google translation of Japanese and are very difficult to read.