I would now like you to light it up, all the trees on fire. Look at the smoke. Now, go to your mapping software of choice and look at your position on Planet Earth relative to Sendai.
If you don't think you would see the smoke from a fire of this size (rather small) at your current location, then you no have reason to be concerned about the fallout because the atmospheric transport mechanisms are exactly the same. In fact, fallout of the radioactive materials of concern are a bit less of a worry because the elements and isotopes of highest concern tend to be rather dense and not travel well. To move it around the world by getting material to the high winds of the stratosphere, you have to have a very large and/or very energetic fire.
Of course, moving material to that height in the air column also means global dilution as you spread it everywhere. Other than the immediate reactor vicinity, no one place gets particularly crapped up.
I'm pretty tired of explaining things to people that seem to want this to be catastrophic nuclear doom for the world. I do not understand why this narrative is appealing and makes intuitive sense to people. Wait, yes I do; Doom By Man's Hubris is a classical theme. Damn my GM storytelling experience.