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Fundamental study on flow characteristics of disrupted core pool at a low energy level (Joint research)

低エネルギー炉心プールの流動特性に関する基礎的研究(共同研究)

守田 幸路*; Liu, P.*; 松元 達也*; 福田 研二*; 飛田 吉春; 佐藤 一憲 

Morita, Koji*; Liu, P.*; Matsumoto, Tatsuya*; Fukuda, Kenji*; Tobita, Yoshiharu; Sato, Ikken

液体金属高速炉の低エネルギー損傷炉心における炉心物質の流動性をモデル化するため、液体プール中における固体粒子層の圧力過渡に対する運動挙動について研究を行った。圧力源として加圧窒素を用い、初期圧力,固体粒子層高さ,固体粒子タイプをパラメータとした一連の実験とともに、高速炉安全解析コードSIMMER-IIIを用いた数値シミュレーションを実施した。SIMMER-IIIコードを用いた実験解析の結果は、本コードの物理モデルや手法が実験で観察された固相の割合が高い多相流の過渡挙動を適切に表現できることを示した。多相流における固体粒子相の過渡挙動を取り扱ううえで重要なSIMMER-IIIのモデルの妥当性についても議論した。

Dynamic behaviors of solid particle beds in a liquid pool against pressure transients were investigated to model the mobility of core materials in a low-energy disrupted core of a liquid metal fast reactor. A series of experiments was performed with a particle bed of different heights, comprising different monotype solid particles, where variable initial pressures of the originally pressurized nitrogen gas were adopted as the pressure source. Computational simulations of the experiments were performed using SIMMER-III, a fast reactor safety analysis code. Experimental analyses using the SIMMER-III code show that physical models and methods used in the code can reasonably represent the transient behaviors of multiphase flows with rich solid phase as observed in the experiments. The validation of several key models of SIMMER-III was also discussed for treating transient behaviors of the solid-particle phase in multiphase flows.

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