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In this study, we designed a 100 MWt HTGR using High-Temperature Engineering Test Reactor (HTTR) 30 MWt as reference. The ZrC layer applied to the TRISO coated fuel particles as a substitute from the SiC layer. Geometry of the reactor is changed by adding the additional layer in the axial direction. The change in geometry is expected to extend the life of the reactor, and the use of ZrC Triso Coated Fuel Particle (TRIZO) is expected to improve the performance of coated fuel particles. Neutronic analysis is performed by calculating k-eff and k-inf using SRAC code with the JENDL 4.0 nuclear data library.