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Journal Articles

Contribution of the surface diffusion on mass transfer of Ba$$^{2+}$$ in granite matrix

Yamaguchi, Tetsuji; Nakayama, Shinichi; Kawada, Chiharu*

Genshiryoku Bakkuendo Kenkyu, 9(1), p.61 - 66, 2002/09

https://doi.org/10.3327/jnuce.9.61

The effective diffusivity (${it D}$$$_{e}$$) and distribution ratio (${it K}$$$_{d}$$) of $$^{133}$$Ba$$^{2+}$$ in Inada granite have been determined by the through-diffusion method. Experiments were performed in triplicate for 10$$^{-1}$$, 1 and 10 mol m$$^{-3}$$ BaCl$$_{2}$$ solutions at 25$$^{circ}$$C. The ${it D}$$$_{e}$$ value obtained at a BaCl$$_{2}$$ concentration of 10 mol m$$^{-3}$$, agreed to the estimated value based on the pore diffusion model. The lower BaCl$$_{2}$$ concentrations yielded higher ${it D}$$$_{e}$$ values and higher ${it K}$$$_{d}$$ values. The variation in ${it D}$$$_{e}$$ was neither due to the speciation of barium in the solutions nor due to variation in physical properties of the pore structure in the rock. Contribution of diffusion in sorbed state should be responsible for the variation in ${it D}$$$_{e}$$.

JAEA Reports

Study of aqueous process

; ; Kaneko, Masaaki*; *; *

JNC TJ6400 2001-012, 51 Pages, 2002/03

JNC-TJ6400-2001-012.pdf:1.68MB

no abstracts in English

JAEA Reports

Investigation on influence of design specification to decontamination efficiency in pyro-chemical decontamination equipment

; ; *; *; Fujita, Reiko*

JNC TJ6400 2001-011, 35 Pages, 2002/02

JNC-TJ6400-2001-011.pdf:4.81MB

no abstracts in English

JAEA Reports

Study on reduction of oxide uranium in lithium process II

*; Fujita, Reiko*; Yahata, Hidetsugu*; *; Utsunomiya, Kazuhiro*

JNC TJ8400 2001-029, 52 Pages, 2001/01

JNC-TJ8400-2001-029.pdf:3.96MB

Pyrochemical reprocessing is one of a successful candidate of good economy for spent fuel reprocessing. Metallic fuel reprocessing process based on Argonne National Laboratory technology needs a reduction process from oxide fuel to metallic fuel to be applied to oxide fuel reprocessing. This study has examined the reduction process using metallic Li as a reducing agent for UO$$_{2}$$ which is comparatively estimated with the results of U$$_{3}$$O$$_{8}$$ examined last year after investigating the material of mesh basket with literature. The mesh basket made of Ti and W for oxide container, which are selected by investigating the material of mesh basket with literature, were both broken during reduction. However, the mesh basket made of several layers of stainless steel was not broken at the same reduction condition. The reduction ratio of UO$$_{2}$$ was estimated to be about 80-100% by a gas bullet method or an acidic pretreatment method. The influence of simulated fission products (FPs) on the reduction ratio of UO$$_{2}$$ was nothing, however the reduction products were mixed with the simulated FPs. A further study such as investigating the behavior of FPs in the Li reduction conditions and establishing the separation process of FPs from the reduction products of UO$$_{2}$$ is necessary.

Journal Articles

Report of participation in 6th international conference on the chemistry and migration behavior of actinides and fissin products in the geosphere

Kawada, Chiharu*; Nakayama, Shinichi

Genshiryoku Bakkuendo Kenkyu, 4(2), p.97 - 99, 1998/03

https://nuce.aesj.or.jp/jnuce/vol4/Jnuce-Vol4-2-p97-99.pdf

no abstracts in English

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