[1M11-14] Analysis Code Development

[1M12] Development of Core Management Code System SHIKOKU2

(3)Improvement of Energy Group Structure for Core Calculation

Masami Hirano¹, Emi Yoshida¹, Kosuke Miyawaki¹, *Yosuke Kawamoto², Kazuma Oohori², Masaki Shimamoto², Yutaka Umakoshi² (1. Yonden Eng., 2. YONDEN)

Keywords:SHIKOKU2-3D, core analysis, energy group structure, optimization method, differential evolution

In order to improve the accuracy and reduce the calculation cost of the core analysis of commercial light water reactors, we investigated the improvement of the energy group structure in the core calculation of SHIKOKU2-3D. We confirmed that the optimization method using differential evolution can obtain a group structure with the same analytical accuracy with a smaller number of groups than the conventional one.