Activities of Water and Nitric Acid in Simulated Reprocessing Waste Solutions.

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概要

• 論文の詳細を見る

• Simulations were carried out for thermodynamic activities of water and nitric acid in simulated reprocessing solutions under a high level liquid waste (HLLW) evaporation condition.A prediction method based on a "Hydration Model" was developed to evaluate the activity coefficients of nitric acid and water in nitric acid solutions containing fission products. Suitability of the "Hydration Model" was confirmed ; the changes in activity coefficient were well explained. Models predictions agreed well with the reported experimental results for changes of nitric acid concentration in the HLLW solution during the evaporation concentration process.The calculated activities of water and nitric acid were constant during the concentration process, except for the initial transient stage. Therefore nitric acid concentration changes should not have significant effects on chemical reactions, such as precipitation or volatilization, in the solution during HLLW concentration.

• 一般社団法人 日本原子力学会の論文

著者

• KAWAMURA Fumio

  Energy Research Laboratory, Hitachi Ltd.

• SASAHIRA Akira

  Energy and Environmental Systems Laboratory, Hitachi, Ltd.

• NAKAMURA Tomotaka

  Energy Research Laboratory, Hitachi Ltd.

• FUKASAWA Tetsuo

  Energy Research Laboratory, Hitachi Ltd.

• HOSHIKAWA Tadahiro

  Energy Research Laboratory, Hitachi Ltd.

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