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高レベル及びTRU廃棄物地層処分の性能評価のためのJAEA熱力学データベース; モリブデンの熱力学データ選定

JAEA thermodynamic database for performance assessment of geological disposal of high-level and TRU wastes; Selection of thermodynamic data of molybdenum

北村 暁; 桐島 陽*; 斉藤 拓巳*; 澁谷 早苗*; 杤山 修*

Kitamura, Akira; Kirishima, Akira*; Saito, Takumi*; Shibutani, Sanae*; Tochiyama, Osamu*

高レベル放射性廃棄物及びTRU廃棄物の地層処分の性能評価に用いるための熱力学データベースの整備の一環として、モリブデンの熱力学データ選定を実施した。熱力学データの選定対象は、放射性廃棄物処分で問題となる環境条件を踏まえ、低モリブデン濃度,中性もしくはアルカリ性水溶液中で生成する化学種及び化合物とした。経済協力開発機構原子力機関(OECD/NEA)の熱力学データベース整備ガイドラインに基づき、熱力学データが報告されている文献を広範に調査したうえで、各化学種の熱力学データの選定のために文献の詳細なレビューを行った。レビューの結果、信頼性が高いと判断された文献情報を用いて、25$$^{circ}$$C,イオン強度0における熱力学データの導出を行った。特に、モリブデン酸イオン(MoO$$_{4}$$$$^{2-}$$)の水素イオン(H$$^{+}$$)との相互作用によって生成する化学種のレビュー及び熱力学データ選定について、慎重に実施した。

Within the scope of the JAEA thermodynamic database project for performance assessment of geological disposal of high-level radioactive and TRU wastes, the selection of the thermodynamic data on the inorganic compounds and complexes of molybdenum were carried out. We focused to select thermodynamic data of aquous species and compounds which could form under repository conditions for the disposal of radioactive wastes, i.e. relatively low concentration of molybdenum and from near neutral through alkaline conditions. Selection of thermodynamic data was based on the guidelines by the Nuclear Energy Agency in the Organisation for Economic Co-operation and Development (OECD/NEA). Extensive literature survey was performed and all the obtained articles have been carefully reviewed to select the thermodynamic data for molybdenum. Thermodynamic data at 25 $$^{circ}$$C and zero ionic strength were determined from accepted thermodynamic data which were considered to be reliable. We especially paid attention to select formation constant of molybdate ion with hydrogen ion.

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