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TRU核種に関する野外核種移行試験,3; 通気層土壌中における核種移行試験

Field tests on migration of TRU-nuclide, 3; Migration test of radionuclide in aerated soil layer

向井 雅之; 田中 忠夫; 前田 敏克; 小川 弘道; 松本 潤子; 宗像 雅広; Zhao, Y.*; Guo, Z.*; Ni, S.*; Li, S.*

Mukai, Masayuki; Tanaka, Tadao; Maeda, Toshikatsu; Ogawa, Hiromichi; Matsumoto, Junko; Munakata, Masahiro; Zhao, Y.*; Guo, Z.*; Ni, S.*; Li, S.*

地質媒体中における核種移行の評価は野外試験に基づくデータが十分でない点で特にTRU核種の浅地層中処分における安全評価で重要である。日本原子力研究所と中国輻射防護研究院間の共同研究として、自然条件下でSr-90,Np-237,Pu-238を用いた野外移行試験を行い、実際の通気層における核種移行データを取得した。既存の移行評価式に入力するパラメータの値を、実験室実験及び野外調査により決定した。取得した値を使用して計算した核種移行分布は野外試験の実測データとおおむね一致し、核種移行評価式の適用性が確認できた。

Evaluation of radionuclide migration in geologic media is of great importance in safety assessment for shallow land disposal specially for TRU nuclides because of inadequate data based on field test. As a cooperative research between JAERI and CIRP, a field test of radionuclide migration was conducted under natural condition using Sr-90, Np-237 and Pu-238 to obtain migration data of the radionuclides in actual aerated layer under natural rainfall condition. Values of input parameters to an existing evaluation equation of nuclide migration were determined on the basis of the results of laboratory experiments of batch and column methods and field investigation. Migration distribution of the radionuclides calculated with the determined values showed reasonable agreement with the measured distribution of the field test. This confirmed an applicability of the evaluation equation for radionuclide migration to actual aerated layer under natural condition.

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