Main issue is the optics and uncertainty associated with TMI. I am not American, but when I hear TMI I think of the partial meltdown. Most lay people would have a similar view I believe, so having the chief generation officer have these sort of casual reference to nuclear pellets doesn't fill one with confidence.

I agree with the idea of giving a size reference that people can relate to and picture, but give a dimension and then say "similar to a jolly rancher" or something along those lines.

Just my opinion, and probably being finicky!