A long-term THMC assessment on the geochemical behavior of the bentonite buffer
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- SUZUKI Hideaki
- Near-Field Research Group, Geological Isolation Research and Development Directorate, Japan Atomic Energy Agency (JAEA)
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- NAKAMA Sigeo
- Near-Field Research Group, Geological Isolation Research and Development Directorate, Japan Atomic Energy Agency (JAEA)
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- FUJITA Tomoo
- Near-Field Research Group, Geological Isolation Research and Development Directorate, Japan Atomic Energy Agency (JAEA)
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- IMAI Hisashi
- Near-Field Research Group, Geological Isolation Research and Development Directorate, Japan Atomic Energy Agency (JAEA)
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- SAZARASHI Masami
- Near-Field Research Group, Geological Isolation Research and Development Directorate, Japan Atomic Energy Agency (JAEA)
Bibliographic Information
- Other Title
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- 熱－水－応力－化学連成解析による緩衝材の地球化学環境の変遷に着目したニアフィールド長期挙動評価の一例
- ネツ-ミズ-オウリョク-カガクレンセイカイセキ ニ ヨル カンショウザイ ノ チキュウ カガク カンキョウ ノ ヘンセン ニ チャクモク シタ ニアフィールド チョウキ キョドウ ヒョウカ ノ イチレイ
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Abstract
For the safety assessment of a geological disposal system for high-level radioactive waste, it is necessary to quantify coupled thermo-hydro-mechanical-chemical (THMC) processes in the near-field. The current study investigated the geochemical changes arising from the infiltration of groundwater into the bentonite buffer under a thermal regime of radiogenic heating arising from the vitrified waste with the computer simulated assistance of a developed THMC model. In the case of infiltration by a saline groundwater, sulfate precipitates as gypsum around the overpack in the bentonite buffer and the Na-type bentonite changes to Ca-type by exposure to Ca ions released from concrete supports. In addition, the temporal evolution of the bentonite buffer porewater composition can be obtained to assess its contribution to the corrosion of the overpack.
Journal
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- Journal of Nuclear Fuel Cycle and Environment
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Journal of Nuclear Fuel Cycle and Environment 19 (2), 39-50, 2012
Division of Nuclear Fuel Cycle and Environment, Atomic Energy Society of Japan
