Please read this (reposting from page earlier buried in links) - if you really worried it's like Chernobyl and why it isn't anywhere near that.
http://morgsatlarge.wordpress.com/20...lear-reactors/
IN short - there is a lot of nonsense in Media and there are tons of links if you want to understand this. The problem isn't reactor, it's the aftermath of tsunami, load on the power network, etc, etc but reactor will be fine and is built to withstand this. If it melts, it melts and plant is facked but water will be decontaminated, and in general, they are just going through the book now, one after the other and if they can't cool the rods (to below 2200C) they'll just have fuel melt and than be cooled off in the catchment area which is bad of course.
On a side note, it's bizzare how world works - US nuked Japan in 45 and 55 years Japan is asking it for help from contaminating the region.