[2E14-18] High-temperature Gas-cooled Reactor, Fundamental Property

[2E15] Multiphysics Behavior in HTGRs with High Power Density

(2)Feasibility Study

*Kuniyoshi Takamatsu¹, Shoichiro Okita¹, Yukio Tachibana¹, Yosuke Nishimura², Koji Okamoto² (1. JAEA, 2. UTokyo)

Keywords:HTGR, Silicon carbide, V&V, Accident analysis, Passive safety

In this study, accident analyses of high-power density HTGRs adopting SiC-matrixed fuel compacts and feasibility study were conducted. Specifically, for the feasibility study, rapid depressurization accidents were analyzed using the two-dimensional unsteady heat transfer analysis code for safety evaluation of HTGRs. As a result of the rapid depressurization accident analyses, the fuel temperature and RPV temperature distributions in the HTGRs with high-power density were clarified, and it was confirmed that the maximum fuel temperature does not exceed 1400℃. In other words, even if a rapid depressurization accident occurs, the high-power density HTGRs adopting SiC-matrixed fuel compacts will be able to have excellent passive safety features.