Journal of Nuclear Fuel Cycle and Environment
Online ISSN : 2186-7135
Print ISSN : 1884-7579
ISSN-L : 1343-4446
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Volume 25, Issue 2
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Research Article
  • Gap-filling property of spherical bentonite pellets
    Hitoshi NAKASHIMA, Hidekazu ASANO, Satohito TOGURI
    2018 Volume 25 Issue 2 Pages 61-70
    Published: December 01, 2018
    Released on J-STAGE: February 06, 2019
    DOIhttps://doi.org/10.3327/jnuce.25.2_61
    JOURNAL FREE ACCESS
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      Gaps around buffer material, which are inevitably generated during the construction of the high-level radioactive waste disposal repository, have been preferable to be firmly filled, in terms of securing the quality of the layer of buffer material. As a simple method of gap-filling procedure, it has been studied to merely dropping granulated bentonite without compaction. Although it has an advantage in easy construction, is has a concern of generating lower filling density than that generated by the method of compacting bentonite into gaps. In this study, we have studied the gap-filling property of granular, spherical, and relatively high-density bentonite pellets. We performed small-scale filling tests to discover the potential filling densities of the pellets and reach the consequence that mixing two different sizes of pellets enables the sufficient density of filling.

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