The Japan Atomic Energy Agency (JAEA) is planning to pioneer an innovative approach to hydrogen production by integrating it with a high-temperature gas reactor in Oarai, Ibaraki Prefecture. This project, aiming for a sustainable and uninterrupted supply of hydrogen, is set to be the world's first facility of its kind. By utilizing the high temperatures generated by the gas reactor, which surpass 800 C, the facility can efficiently produce hydrogen without emitting CO2, aligning with global decarbonization goals. Unlike traditional nuclear reactors, which use water for cooling, gas reactors employ helium gas, enabling them to reach higher temperatures suitable for hydrogen production. The interconnected hydrogen facility and the High Temperature Engineering Test Reactor (HTTR) will utilize high-temperature helium gas to catalyze the production of hydrogen from water and methane. The project's potential significance lies in its ability to provide a consistent supply of hydrogen, a crucial element in various industries such as fuel cell vehicles, steelmaking, and chemical manufacturing. The JAEA aims to secure approval for the project in 2025, commence construction in 2026, and begin operations by 2028, with a clear objective of becoming a global leader in hydrogen technology by 2030 and progressing towards commercial viability in the late 2030s. To ensure the project's safety and efficacy, the Nuclear Regulation Authority (NRA) will oversee the review process instead of the Economy, Trade and Industry Ministry, emphasizing the importance of safety in integrating hydrogen production with a nuclear reactor. The successful realization of this project could not only advance Japan's decarbonization efforts but also contribute significantly to energy security and technological advancement in the global hydrogen market.