The Japan Atomic Energy Agency is making strides in the production of clean hydrogen by harnessing the heat generated from its High Temperature Engineering Test Reactor (HTTR) in Oarai, Ibaraki Prefecture. This groundbreaking project, seeking approval from the Nuclear Regulation Authority, aims to utilize a nuclear reactor for hydrogen production, a pivotal step towards achieving carbon neutrality. Hydrogen, being a versatile and emission-free energy carrier, is seen as a vital component in the transition to sustainable energy sources. The agency's focus on High-Temperature Gas-Cooled Reactors (HTGRs) highlights the potential for significant hydrogen output due to their superior temperature capabilities compared to mainstream nuclear reactors. By planning to set up a hydrogen production plant in proximity to the HTTR, the agency envisions a seamless transfer of high-temperature heat through underground piping. While the current process involves CO2 emissions, ongoing research aims to explore hydrogen production methods that are entirely emission-free. The Japanese government's optimistic outlook includes the development of a demonstration HTGR in the 2030s, leveraging the knowledge gained from connecting the HTTR with the hydrogen production plant. This initiative represents a pioneering effort in the integration of nuclear technology for sustainable hydrogen production, marking a significant advancement in Japan's pursuit of clean energy solutions.