Sorry Keg but I tend to agree with the cabin crew, I would not flying to Narita at the moment. Yes the radiation risk is low, but do you really want to be landing and staying at a hotel which is within 200km of a possible full meltdown. Also more possible aftershocks on the way. It just isn't worth the risk. Tea and biccies with the chief pilot sure, but if you refuse to fly I can't see them doing much to you.