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Development of open thermodynamic database on MCCI by combining nuclear fuel and slag databases

核燃料とスラグデータベースの統合による公開熱力学データベースの開発

倉田 正輝 ; 白数 訓子  ; 川上 和人*

Kurata, Masaki; Shirasu, Noriko; Kawakami, Kazuto*

熱力学データベースはMCCIの予備解析に有用な解析ツールである。原子力機構はNSSMCと共同で、双方の熱力学データベースを統合し、公開データベースを開発している。本発表では、アルミナ-シリカ-ウラニア-ジルコニア系のデータベースの整備結果を報告する。

Thermodynamic database is a useful tool for evaluating preliminary chemical reactions during molten core concrete interaction and phase relations in fuel debris. Japan Atomic Energy Agency and Nippon Steel Sumitomo Metal Corporation are collaborating to develop an open thermodynamic database by combining their own nuclear- and steel/slag-databases. The phase diagrams of Al$$_{2}$$O$$_{3}$$-UO$$_{2}$$, Al$$_{2}$$O$$_{3}$$-ZrO$$_{2}$$, SiO$$_{2}$$-UO$$_{2}$$, and UO$$_{2}$$-ZrO$$_{2}$$ sub-systems and those of Al$$_{2}$$O$$_{3}$$-UO$$_{2}$$, SiO$$_{2}$$-UO$$_{2}$$, and Al$$_{2}$$O$$_{3}$$-ZrO$$_{2}$$ sub-systems were able to be drawn properly using the cell model parameters and the sub-lattice model parameters assessed in the present study, respectively. The concerns for improving accuracy on the assessment were extracted in several sub-systems.

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