[3D01-05] 新型炉設計

9:45 〜 10:00

[3D02] Power Distribution Optimized in a Prismatic Type HTGR Using MgO-BeO as a Composite Moderator

*Irwan Simanullang¹, Nozomu Fujimoto¹ (1. Kyushu University)

キーワード：

Block-type HTGR、MgO-BeO moderator、Burnup、Power distribution、Burnable poison

In high-temperature gas-cooled reactors (HTGRs), power distribution plays a prominent role in maintaining fuel temperature within safety limits under all operation conditions. In a previous study, the composite-based moderator MgO-BeO was investigated as a potential replacement for the graphite moderator in the HTGR. The results showed that a small block-type HTGR with 50 MWt power could achieve a burnup of 80 GWd/t. This study investigates the power distribution in the core using non-uniform fuel enrichment while maintaining the burnup target of 80 GWd/t. Moreover, several burnable poison materials were examined to reduce the high initial reactivity in the core.