Plasma temperatures in a tokamak are around 100 million C.
Presumably for a power plant that will run for a long period of time, fuel will have to be injected and "burnt" products will have to be removed.
How will this be done without destroying the fuel injector from the superhot plasma? Is that even possible, or will we be forced to always shut down the operation when replacing fuel?
EDIT: Any device to inject or remove something must be nearby the plasma (not necessarily contacting it). I imagine the black body radiation of a 100 Million C substance causing some extreme radiation damage, not necessarily from alpha/beta particles, but simply from intense EM radiation.