Go and live there if you think that it is really harmless.
I would rather not honestly after it took them 6 years just to get the first image of the corium after endless attempts.
Well, just note that after Chernobyl, Western Europe did live there. The size of the smoke plume (1000s km), radioactive material released (6000kg), and wind/weather during the event affected almost every country including Spain, England, and Norway. Those 300M people arguably recieved higher doses than you would living in the evacuated Fukushima area.
Been near there just like a week ago (Tomioka town). Opened up for resettlement this year. Lots of damage from tsunami, but new buildings are being constructed and there are several functioning hotels and convenience stores. There's massive work going on to decontaminate the remaining areas by 2020. As long as you don't go inside of the nuclear station it should be ok.
https://youtu.be/MU4_bJT8W3Y
The point is that it remained contained... that's good. With prpoer monitor wells even the ground water need not be badly contaminated.