Leaching and migration of neptunium in a simulated engineered barrier system consisting of HLW glass and compacted bentonite

Y. Inagaki; H. Furuya; K. Idemitsu; T. Arima; H. Osako; T. Banba; T. Maeda; S. Matsumoto; I. Nomura; S. Kikkawa; M. Saito; H. Okamoto

doi:10.1016/S0022-3115(01)00588-8

Leaching and migration of neptunium in a simulated engineered barrier system consisting of HLW glass and compacted bentonite

Y. Inagaki, H. Furuya, K. Idemitsu, T. Arima, H. Osako, T. Banba, T. Maeda, S. Matsumoto, I. Nomura, S. Kikkawa, M. Saito, H. Okamoto

Quantum Sciences of Materials

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

In a simulated engineered barrier system consisting of a simulated HLW glass doped with ²³⁷Np, a compacted bentonite and water under reducing conditions, leaching of Np from the glass and diffusion of the leached Np through the bentonite were measured systematically. The following results were obtained: (1) The concentration of dissolved species of Np in the leachate is 10^-7-10^-8 M, which indicates that Np(IV) is the dominant oxidation state in the system and the concentration may be controlled by solubility of NpO_2xH₂O(am). (2) The presence of compacted bentonite facilitates reduction of Np(V) to Np(IV) in the system. (3) The apparent diffusion coefficient of the leached Np through the bentonite is evaluated to be lower than 1.5 × 10^-13m²/s, showing that the diffusivity of Np(IV) is more than one order of magnitude lower than that of Np(V).

Original language	English
Pages (from-to)	168-173
Number of pages	6
Journal	Journal of Nuclear Materials
Volume	298
Issue number	1-2
DOIs	https://doi.org/10.1016/S0022-3115(01)00588-8
Publication status	Published - Sept 2001

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Materials Science(all)
Nuclear Energy and Engineering

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10.1016/S0022-3115(01)00588-8

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Inagaki, Y., Furuya, H., Idemitsu, K., Arima, T., Osako, H., Banba, T., Maeda, T., Matsumoto, S., Nomura, I., Kikkawa, S., Saito, M., & Okamoto, H. (2001). Leaching and migration of neptunium in a simulated engineered barrier system consisting of HLW glass and compacted bentonite. Journal of Nuclear Materials, 298(1-2), 168-173. https://doi.org/10.1016/S0022-3115(01)00588-8

Inagaki, Y, Furuya, H, Idemitsu, K, Arima, T, Osako, H, Banba, T, Maeda, T, Matsumoto, S, Nomura, I, Kikkawa, S, Saito, M & Okamoto, H 2001, 'Leaching and migration of neptunium in a simulated engineered barrier system consisting of HLW glass and compacted bentonite', Journal of Nuclear Materials, vol. 298, no. 1-2, pp. 168-173. https://doi.org/10.1016/S0022-3115(01)00588-8

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title = "Leaching and migration of neptunium in a simulated engineered barrier system consisting of HLW glass and compacted bentonite",

abstract = "In a simulated engineered barrier system consisting of a simulated HLW glass doped with 237Np, a compacted bentonite and water under reducing conditions, leaching of Np from the glass and diffusion of the leached Np through the bentonite were measured systematically. The following results were obtained: (1) The concentration of dissolved species of Np in the leachate is 10-7-10-8 M, which indicates that Np(IV) is the dominant oxidation state in the system and the concentration may be controlled by solubility of NpO2xH2O(am). (2) The presence of compacted bentonite facilitates reduction of Np(V) to Np(IV) in the system. (3) The apparent diffusion coefficient of the leached Np through the bentonite is evaluated to be lower than 1.5 × 10-13m2/s, showing that the diffusivity of Np(IV) is more than one order of magnitude lower than that of Np(V).",

author = "Y. Inagaki and H. Furuya and K. Idemitsu and T. Arima and H. Osako and T. Banba and T. Maeda and S. Matsumoto and I. Nomura and S. Kikkawa and M. Saito and H. Okamoto",

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doi = "10.1016/S0022-3115(01)00588-8",

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T1 - Leaching and migration of neptunium in a simulated engineered barrier system consisting of HLW glass and compacted bentonite

AU - Inagaki, Y.

AU - Furuya, H.

AU - Idemitsu, K.

AU - Arima, T.

AU - Osako, H.

AU - Banba, T.

AU - Maeda, T.

AU - Matsumoto, S.

AU - Nomura, I.

AU - Kikkawa, S.

AU - Saito, M.

AU - Okamoto, H.

PY - 2001/9

Y1 - 2001/9

N2 - In a simulated engineered barrier system consisting of a simulated HLW glass doped with 237Np, a compacted bentonite and water under reducing conditions, leaching of Np from the glass and diffusion of the leached Np through the bentonite were measured systematically. The following results were obtained: (1) The concentration of dissolved species of Np in the leachate is 10-7-10-8 M, which indicates that Np(IV) is the dominant oxidation state in the system and the concentration may be controlled by solubility of NpO2xH2O(am). (2) The presence of compacted bentonite facilitates reduction of Np(V) to Np(IV) in the system. (3) The apparent diffusion coefficient of the leached Np through the bentonite is evaluated to be lower than 1.5 × 10-13m2/s, showing that the diffusivity of Np(IV) is more than one order of magnitude lower than that of Np(V).

AB - In a simulated engineered barrier system consisting of a simulated HLW glass doped with 237Np, a compacted bentonite and water under reducing conditions, leaching of Np from the glass and diffusion of the leached Np through the bentonite were measured systematically. The following results were obtained: (1) The concentration of dissolved species of Np in the leachate is 10-7-10-8 M, which indicates that Np(IV) is the dominant oxidation state in the system and the concentration may be controlled by solubility of NpO2xH2O(am). (2) The presence of compacted bentonite facilitates reduction of Np(V) to Np(IV) in the system. (3) The apparent diffusion coefficient of the leached Np through the bentonite is evaluated to be lower than 1.5 × 10-13m2/s, showing that the diffusivity of Np(IV) is more than one order of magnitude lower than that of Np(V).

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Leaching and migration of neptunium in a simulated engineered barrier system consisting of HLW glass and compacted bentonite

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