2次元解析によるMA含有MOX燃料の組織変化に係る照射中ポア移動挙動評価

Evaluation of pore migration behavior during irradiation to affect the MA-bearing MOX fuel restructuring by 2-dimensional analyses

小澤 隆之   ; 廣岡 瞬 ; 加藤 正人   ; Verdolin, F.*; Novascone, S.*

Ozawa, Takayuki; Hirooka, Shun; Kato, Masato; Verdolin, F.*; Novascone, S.*

米国INLで開発した3次元燃料挙動解析コードBISONにMOX燃料の燃料物性及び挙動解析モデルを組み込み、MOX燃料挙動評価に適用可能な3次元解析コードBISON-MOXを開発している。本発表では、MOX燃料の熱伝導度とともに蒸気種毎の蒸気圧に基づくポア移動モデルを適用し、常陽でのMA含有MOX燃料の照射試験で得られた燃料組織変化のO/M依存性を、BISON-MOXを用いて2次元で解析評価した結果を報告する。

3-dimensional analysis code BISON-MOX to be applied for the irradiation behavior of MOX fuels is being developed by installing MOX fuel properties and analysis models to BISON, which has been developed in INL. Applying the thermal conductivity of MOX fuel and the pore migration model based on vapor pressure of vapor species, the O/M dependence of fuel restructuring observed in MA-bearing MOX fuels irradiation in Joyo were evaluated by 2-dimensional analyses with BISON-MOX.