Dependencies of flow velocity on migration behavior of radionuclides in an unsaturated zone around near-surface underground

Takenori Ozutsumi, Yuichi Niibori, Taiji Chida

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The low-level radioactive wastes from the Fukushima Daiichi accident will be disposed in near-surface underground which is not always saturated by groundwater. In such an unsaturated porous media, migration behavior of radionuclides is predicted to be different from that in the saturated zone. Moreover, the flow rate of groundwater in near-surface underground is generally larger than that in deeper underground. For the performance assessment of near-surface disposal system, this study estimated the retardation coefficients and Peclet numbers under both saturated and unsaturated conditions by measuring breakthrough curve of tracer with a sand packed column. The flow velocities set in this study were based on the hydraulic conductivity that IAEA used to assess for a trench disposal. The results showed that the migration rate of tracer ions under the unsaturated condition exceeded that under the saturated condition, and increased under the condition of higher flow rate.

Original languageEnglish
Title of host publicationPBNC 2018 - Pacific Basin Nuclear Conference
PublisherAmerican Nuclear Society
Pages353-359
Number of pages7
ISBN (Electronic)9780894487743
Publication statusPublished - 2019 Jan 1
Event2018 Pacific Basin Nuclear Conference, PBNC 2018 - San Francisco, United States
Duration: 2018 Sep 302018 Oct 4

Publication series

NamePBNC 2018 - Pacific Basin Nuclear Conference

Conference

Conference2018 Pacific Basin Nuclear Conference, PBNC 2018
CountryUnited States
CitySan Francisco
Period18/9/3018/10/4

ASJC Scopus subject areas

  • Nuclear Energy and Engineering

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