b'Figure 1. Cross-sectional view of the HP-MR, showing its power distribution (hot color) and neutron flux distribution (hot color)Figure 2. Enlarged cross-sectional view of the active core, where TRISO fuel pellets, moderator rods, and heat pipes are distinguishable. The grey circles with dispersed red dots are the fuel pellets, where the red dots represent the TRISO fuel particles. The violet circles are the Yttrium-hydride moderator rods. The cyan circles are the heat pipes, where the inner circle represents the vapor region, and the outer ring represents the liquid region of the heat pipes2023|AFC ACCOMPLISHMENTS 125'