[2D15-21] FP化学挙動

[2D20] 軽水炉シビアアクシデント時の炉内高温領域におけるFP化学挙動評価

(6)軽水炉シビアアクシデントにおける核燃料からのルテニウム放出モデルの改良

*劉 家占¹、宮原 直哉¹、三輪 周平¹、高野 公秀¹、逢坂 正彦¹ (1. 原子力機構)

キーワード：ルテニウム、Mo-Ru-Pd-Rh合金、蒸発、拡散係数

To improve the ruthenium (Ru) release model from a nuclear fuel in a severe accident, the oxidation and vaporization behaviors of Ru from Mo-Ru-Pd-Rh alloys were investigated. A mass transfer theory between bulk atmosphere and the surface of the alloy was applied for the Ru release model. The diffusivities of vaporizing RuO_x in air and argon gas could have been derived experimentally.