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Journal Articles

Radionuclide and colloid migration experiments in quarried block of granite under in-situ conditions at a depth of 240 m

Yamaguchi, Tetsuji; Nakayama, Shinichi; Vandergraaf, T. T.*; Drew, D. J.*; Vilks, P.*

Journal of Power and Energy Systems (Internet), 2(1), p.186 - 197, 2008/00

In safety assessments of the geologic disposal of high-level radioactive wastes, the possibility that long-lived radionuclides may be leached from the wastes and may subsequently be transported through surrounding rock masses must be considered. It is therefore necessary to understand the transport of radionuclides through water-bearing fractures in rocks surrounding the repository. For this purpose, radionuclide migration experiments in quarried blocks of granite under in-situ conditions at the 240-m level in AECL's Underground Research Laboratory (URL) were performed under a five-year cooperative research program between Japan Atomic Energy Research Institute (JAERI, reorganized to Japan Atomic Energy Agency, JAEA) and Atomic Energy of Canada Ltd. (AECL). Migration experiments with Br, synthetic colloids, $$^{3}$$H, $$^{85}$$Sr, $$^{95m}$$Tc, $$^{237}$$Np and $$^{238}$$Pu, and post-experimental alpha and $$gamma$$ scanning of the fracture surfaces were performed using 1 m$$^{3}$$ granite blocks, each containing a single fracture, excavated from a water-bearing fracture zone. The transport of the radionuclides was affected by macroscopic mechanical dispersion, matrix diffusion and element specific sorption on fracture surfaces. Colloid transport exhibited a complicated process that may include sedimentation and diffusion into stagnant zones.

Journal Articles

Radionuclide and colloid migration experiments under deep geological conditions in the underground research laboratory, Canada

Kumata, Masahiro; Nakayama, Shinichi; Vandergraaf, T. T.*; Drew, D. J.*

JAERI-Conf 99-004, p.395 - 410, 1999/03

no abstracts in English

Journal Articles

Experimental study on neptunium migration under in situ geochemical conditions

Kumata, Masahiro; Vandergraaf, T. T.*

Journal of Contaminant Hydrology, 35(1-3), p.31 - 40, 1998/00

 Times Cited Count:6 Percentile:24.13(Environmental Sciences)

no abstracts in English

Journal Articles

SrI$$_{2}$$ diffusion experiment in a granite from underground research laboratory in Manitoba, Canada

Yamaguchi, Tetsuji; Nakayama, Shinichi; Vandergraaf, T. T.*

Materials Research Society Symposium Proceedings, Vol.506, p.1091 - 1093, 1998/00

no abstracts in English

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