http://www.yomiuri.co.jp/science/new...htm?from=main7
Yomiuri reports that a health research center in Shinjuku in Tokyo has been reading 0.035 micro sv until yesterday, and registered a spike up to 0.809 micro sv by 10 AM this morning, and it's now gone down to 0.151 micro sv.
The previous high ever recorded there was 0.079 micro sv.
Keeping this in perspective, the highest reading right next to the plant was 400 milli sv, which is 500000 times higher.
And even 400 milli sv is only seriously dangerous if you are exposed to it for more than a few hours.