The U.S. Environmental Protection Agency, The U.S. Food and Drug Administration and The National Oceanic and Atmospheric Administration are actually pretty confident that radiation will disperese rapidly and never reach the US at all. It's actually not that significant of an event for us. Conspiracy theorists love to create panic. It's like they are really bored or something... hmmm.
http://www.nmfs.noaa.gov/mediacenter/201...ay2011.pdf
http://www.nmfs.noaa.gov/mediacenter/201...ay2011.pdf