Jack - as I said before, neutrons themselves aren't "radiation" in the commonly understood sense, and they don't necessarily make whatever they hit radioactive. I'm not planning to go through the list of possible elements that might possibly be involved in the construction of a putative fusion reactor. But where most common stable isotopes are concerned, the absorption of a single neutron isn't going to create an unstable radioactive one.

I'll grant you in advance that in a fixed construction, any given atom is likely to be subjected to multiple chances to absorb a neutron & therefore some will absorb multiple neutrons & become radioactive. That's why I am curious as to how & what NS thinks may be created as radioactive waste. Assuming the article has any detail on the topic!