DOCTORAL PROGRAM STUDENT, DEPARTMENT OF NUCLEAR ENGINEERING, TOKYO INSTITUTE OF TECHNOLOGY
Failure to remove residual decay heat in the Fukushima Daiichi Nuclear Power Plant in 2011 has definitely influenced design attitudes toward nuclear reactors with passive-decay heat-removal features. Generally, modular high temperature gas-cooler reactors (HTGRs) have the ability to remove decay heat apart from their active and passive cooling systems. However, the feasibility of passive-decay heat removal in HTGRs is subject to design parameters. A systematic methodology for designing HTGR for passive-decay heat removal is introduced. As a part of this study, the conditions of several design parameters is used obtained in previous research for both underground and aboveground HTGRs capable of removing decay-heat successfully and satisfying the safety limit of temperatures of fuel and reactor buildings (RB) . The neutronic performance of a small HTGR whose design parameters were obtained using the conditions was investigated also.