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塩濃縮シミュレーションに関する研究(共同研究)

Study on simulation of salt accumulation (Joint research)

藤田 朝雄 ; 油井 三和; 鈴木 英明*; 藤崎 淳; 九石 正美*

Fujita, Tomo; Yui, Mikazu; Suzuki, Hideaki*; Fujisaki, Kiyoshi; Sazarashi, Masami*

本報告書は、財団法人産業創造研究所と日本原子力研究開発機構との共同研究「塩濃縮シミュレーションに関する研究」の成果を報告するものである。室内において塩濃縮実験を実施した結果、加熱部近傍で、Na$$_{2}$$SO$$_{4}$$やCaSO$$_{4}$$が濃縮することが確認され、この事実に基づいて塩濃縮現象のメカニズムを仮定し、モデルを作成した。次に、既存の地球化学解析コード、PHREEQCを用いて、飽和系での塩濃縮に関するシミュレーションを実施した結果、定性的な挙動の評価は可能であったが、定量的な挙動の評価のためにはさらなるモデル化の検討が必要であることがわかった。さらに、熱-水-応力-化学連成解析コードを用いた解析評価を実施した。この解析は、gypsumの濃縮に着目して実施し、その結果、濃縮現象の傾向は実験結果のそれと一致した。しかし、gypsumの緩衝材中の分布形状に関しては、一致していない部分もあり、境界条件設定の再検討や連成解析モデル/コードが有する課題検討が必要であることが明らかになった。

This report describes the results of a joint research entitled "Study on Simulation of Salt Accumulation" which was conducted under the collaboration between the Institute of Research and Innovation and the Japan Atomic Energy Agency. In the experiments for salt accumulation, accumulation of ${it Na$_{2}$SO$_{4}$}$ and ${it CaSO$_{4}$}$ was observed near the heater surface. Based on the facts from experiments, we have made hypothesis for mechanism of salt accumulation, and developed the model for it. Then, we conducted numerical simulations for salt accumulation phenomena under the saturated condition using the geochemical code "PHREEQC". It became clear that salt accumulation behavior can be evaluated qualitatively from these simulations, but quantitative evaluation requires more realistic modeling. Moreover we evaluated salt accumulation phenomena by simulations using coupled thermo - hydro - mechanical and chemical model / code assuming the unsaturated and / or saturated condition. A series of simulations were conducted focusing on accumulation of gypsum, and the result showed that tendency of salt accumulation phenomena was in agreement with that of experiments, but the profile of distribution of accumulated gypsum was not in agreement. In conclusion, it became clear that more realistic boundary condition should be considered and problems on coupled model / code were identified for further study.

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