MCNPによるHTTR被覆燃料粒子のランダム配列に関する解析的研究

Numerical investigation of random packing for CFPs of HTTR using MCNP

Ho, H. Q.   ; 本多 友貴; 後藤 実  ; 高田 昌二

Ho, H. Q.; Honda, Yuki; Goto, Minoru; Takada, Shoji

This study investigated several stochastic geometry treatments for the coated fuel particles (CFPs) in the high temperature engineering test reactor (HTTR) fuel compact. The criticality calculations were carried out by using MCNP5 for a single fuel block with reflecting boundary condition. The infinite multiplication factor (kinf) of these random arrangements was about 0.03% - 0.15% difference compared to that of regular (uniform) arrangement. The random packing CFPs in an annular lattice showed the highest kinf due to non-truncated CFPs in this model.