고준위 방사성 폐기물 지질처분을 위한 해외 선진국의 심부 지하수 환경 연구 동향 분석 및 시사점 도출

Translated title of the contribution: Status and Implications of Hydrogeochemical Characterization of Deep Groundwater for Deep Geological Disposal of High-Level Radioactive Wastes in Developed Countries

Jaehoon Choi, Soonyoung Yu, Sun Ju Park, Junghoon Park, Seong Taek Yun

Research output: Contribution to journalReview articlepeer-review

1 Citation (Scopus)

Abstract

For the geological disposal of high-level radioactive wastes (HLW), an understanding of deep subsurface environment is essential through geological, hydrogeological, geochemical, and geotechnical investigations. Although South Korea plans the geological disposal of HLW, only a few studies have been conducted for characterizing the geochemistry of deep subsurface environment. To guide the hydrogeochemical research for selecting suitable repository sites, this study overviewed the status and trends in hydrogeochemical characterization of deep groundwater for the deep geological disposal of HLW in developed countries. As a result of examining the selection process of geological disposal sites in 8 countries including USA, Canada, Finland, Sweden, France, Japan, Germany, and Switzerland, the following geochemical parameters were needed for the geochemical characterization of deep subsurface environment: major and minor elements and isotopes (e.g., 34S and 18O of SO4/213C and 14C of DIC, 2H and 18O of water) of both groundwater and pore water (in aquitard), fracture-filling - minerals, organic materials, colloids, and oxidation-reduction indicators (e.g., Eh, Fe2+/Fe3+, H2S/SO4/2, NH4/NO3-). A suitable repository was selected based on the integrated interpretation of these geochemical data from deep subsurface. In South Korea, hydrochemical types and evolutionary patterns of deep groundwater were identified using artificial neural networks (e.g., Self-Organizing Map), and the impact of shallow groundwater mixing was evaluated based on multivariate statistics (e.g., M3 modeling). The relationship between fracture-filling minerals and groundwater chemistry also has been investigated through a reaction-path modeling. However, these previous studies in South Korea had been conducted without some important geochemical data including isotopes, oxidation-reduction indicators and DOC, mainly due to the lack of available data. Therefore, a detailed geochemical investigation is required over the country to collect these hydrochemical data to select a geological disposal site based on scientific evidence.

Translated title of the contributionStatus and Implications of Hydrogeochemical Characterization of Deep Groundwater for Deep Geological Disposal of High-Level Radioactive Wastes in Developed Countries
Original languageKorean
Pages (from-to)737-760
Number of pages24
JournalEconomic and Environmental Geology
Volume55
Issue number6
DOIs
Publication statusPublished - 2022 Dec

Bibliographical note

Publisher Copyright:
© 2022 The KSEEG. Printed by Hanrimwon Publishing Company. All rights reserved.

ASJC Scopus subject areas

  • Environmental Science (miscellaneous)
  • Geology
  • Economic Geology

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