We thus need to pursue fusion to the reactor scale through constructing Iter to see whether and to what extent it can contribute.

BBC: VIEWPOINT

The gravity-based system responded as it was designed to, circulating water and steam in a continuous loop to keep the scale-model reactor at a safe temperature automatically.

CNN: Today/Tomorrow - Helping nuclear plants keep their cool

Thermoelectric coupling uses heat from the decay of a radioactive fuel (as opposed to the full-scale nuclear fission which powers a reactor on Earth) as its energy source.

ECONOMIST: A more efficient way to make electricity in spacecraft