"The chairman of the Nuclear Regulatory Commission was invited to the White House briefing today to assure Americans that they had nothing to fear from the nuclear radiation coming out of Japan's damaged reactors and that the nuclear reactors in the United States were safe. When he was finished taking questions there was very little reassurance on either front.
When the White House press corps sought more specific and detailed information about both fallout and nuclear plant safety, the chairman, Gregory Jaczko, would not offer any. Instead he said he wouldn't want to speculate about either one. The irony is that dodging these questions as he did left the impression that his assertion of nothing to fear was nothing more the speculation."