> If you're counting neutrons in that "energy flux", they'll just go through the wall (mostly); this is how tokamaks are supposed to make electricity, ie the neutrons go through the wall and hit a "blanket" that's much better at absorbing neutrons, and the blanket will heat up and the heat will be converted to electricity.

Yes! This is what I was wondering about. Presumably you would want more energy out than you use to run the reactor, and if that amount of neutron flux would melt the wall it would not be a workable design. Glad to know if this is not true.