Hydrogen and nuclear energies are expected as excellent energy resources and are environmentally friendly owing to the absence of emission of carbon dioxide. Toshiba has been developing the high-temperature steam electrolysis technology using solid-oxide cells for hydrogen production by nuclear energy. This paper shows the possibility of hydrogen production by high-temperature steam electrolysis using nuclear energy, through examination of the system concept applied to a high-temperature gas cooling reactor, with review of the results of research and development in Toshiba in relation to development issues clarified from tha viewpoint of hydrogen production efficiency, hydrogen production cost, and development risk.
