Actually I posted a similar thread earlier ago to get some feedback from the other JMs. Unfortunately those feedback remains to be quite unconstructive or general which you and I know e.g. "If you are afriad, you should not go.." or " Travelling is for pleasure...if you are fear, better not go..."etc. I guess the reason why we posted a thread like this is hoping to gain some recognition from the others in justifying our decision to go or not. Therefore, in the end I chose to believe in facts rather than feedbacks of the others to draw conclusion. Based on my research, the below facts for your reference: (hopefully it helps you to draw an impartial decision too!)
1. Distance between Fukushima and Sapporo = 592km
2. Distance between Fukushima and Tokyo=240km
3. Distance between Fukushima and Seoul = 1190km
4. According to WHO, the impact on a location beyond 160km whereby an accident of nuclear plant explosion happened is considered not significant.
5. Timeframe - More than one year after the accident, the polluted substances is cleared gradually.