[en] KAERI has established a plan to demonstrate a massive production of hydrogen using a very high temperature gas cooled reactor (VHTR) by the early 2020s. The feasibility of nuclear hydrogen has been surveyed since 2002 and a government funded comprehensive project to develop very high temperature gas cooled reactor technology, the coated fuel technology, hydrogen production technology, and the relevant technologies started in 2004. From 2006, the Korean government started a project called 'Development of Key Technologies for Nuclear Hydrogen.' The main focus of the project is (1) to develop the computer codes and the databases to support the design activity of the very high temperature reactor; (2) to develop a manufacturing process and the qualification of the TRISO coated fuel particle; (3) to select and modify the materials for the very high temperatures and coupled thermo-chemical process; (4) to verify the performance of the materials in the small gas loop to be constructed; and (5) to develop the Sulfur Iodine (SI) thermo-chemical process for a pressurized condition. In parallel, multi-lateral GIF collaborations are being carried out. The GIF/VHTR materials R and D plan is composed of three work packages - graphite, metallic materials and composites and ceramics. These materials have been designated for the reactor sub-systems and nuclear energy system components