Join Date: Nov 2005
Location: SIN / CNX / SFO
Programs: UA GS, SQ PPS, Hyatt Globalist, Marriott Titanium, Hilton Diamond, Accor Gold
Posts: 1,253
You and your travel agent worry too much. I've been in Tokyo since the earthquake and subsequent incident at the Fukushima nuclear plant, and haven't been concerned about radiation exposure at all.
If the NRT connection is cheaper/more convenient/otherwise preferable to the ICN one, don't worry about imaginary health effects of radiation from Fukushima and go ahead and book your flights.