Atomic energy utilization is an effective way of solving the global warming by CO{sub}2 emission. Thermal energy utilization accounts for more than two thirds of total energy utilization at present, and therefore it is important to extend the heat utilization of atomic energy because of the reduction of CO{sub}2 emission in the world.In this report, we studied the coal gasification system using HTGR nuclear heat in an ammonia production plant as the system using the atomic energy directly as well as generating electricity. We selected a steam reforming method as the coal gasificationusing the nuclear heat and could improve the heat utilization efficiency of secondary helium gas from HTCR by adopting the two-stage coal gasifier. Finally, we clarified that this new system using the nuclear heat could reduce CO{sub}2 emission by aboutfive hundred thousand tons per year compared with the conventional system using fossil fuel, and described the subjects for the realization of the coal gasification system using the nuclear heat.
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