30km away radiation levels are 10 times higher than normal.
Ten times higher than background radiation is nothing to worry about.
I think you need to do your research.
Likewise. According to this article: http://www.theregister.co.uk/2011/03/17/fukushima_thursday/page2.html, the maximum dose the the nuclear plant workers are being allowed to be exposed to as a result of this accident is 250 millisieverts. As the article states, the LD50 (dose that'll kill 50%) is 4000 millisieverts. While I wouldn't want to get exposed to that level of radiation myself, it seems to me like the workers are being quite well looked after. The very fact that they've been evacuated at all suggests that they're making sure the workers are OK, rather than sacrificing them in a blind panic in order to regain control. Have a look at this: http://www.world-nuclear-news.org/RS_Attempts_to_refill_fuel_ponds_1703111.html - and bear in mind that the workers on site will, for most of the time, be in a heavily shielded room. Radiation levels near the reactors themselves are high, but at the edge of the site they aren't nearly as high, and have been dropping for some time.