Oral Session

E-4: Radioactive waste disposal: geological, hydrogeological and geochemical aspects.

Sat. Aug 19, 2023 9:00 AM - 12:15 PM ROOM1 (Exhibition Hall 1-A)

Chairman:Tsutomu Sato(Hokkaido University)、Yuichi Niibori(Tohoku University)、Jordi Cama(Institute of Environmental Assessment and Water Research)

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9:00 AM - 9:30 AM

[OE4-01] Characteristics and ion-binding properties of dissolved organic matters in deep sedimentary groundwater

*Takumi Saito¹, Shusaku Nishi¹, Hayato Sato¹ (1. The University of Tokyo (Japan))

9:30 AM - 9:45 AM

[OE4-02] A Study on Invasion Behavior of Buffer Material into a Neighboring Rock Fracture Considered Density Distribution Change in Buffer Material Based on Particle Diffusion Model

*Kengo Yamanaka¹, Haruo Sato¹ (1. Okayama Univ. (Japan))

9:45 AM - 10:00 AM

[OE4-03] Fe-silicate and -carbonate formations at C-steel – compacted bentonite interface hinders buffer degradation in high-level radioactive waste disposal

*Ryosuke Kikuchi¹, Tatsuya Fujimura², Tsutomu Sato¹, Tsubasa Otake¹, Yoko Ohtomo¹, Takahiro Goto³, Satoru Suzuki³, Naoki Taniguchi⁴, Hiroyuki Suzuki⁴ (1. Faculty of Engineering, Hokkaido University (Japan), 2. Graduate School of Engineering, Hokkaido University (Japan), 3. Nuclear Waste Management Organization of Japan (Japan), 4. Japan Atomic Energy Agency (Japan))

10:00 AM - 10:15 AM

[OE4-04] Rapid and long-lasting bedrock flow-paths sealing by using ‘synthetic concretion-forming resin’: an application of in-situ experiments

*Shinji Takeuchi¹, Hidekazu Yoshida², Koichi Karukaya², Koshi Yamamoto² (1. Nihon Univ. (Japan), 2. Nagoya Univ. (Japan))

Presenter changed from Shinji Takeuchi to Hidekazu Yoshida

10:15 AM - 10:30 AM

[OE4-05] Analysis of Thermo-Hydro-Chemical (T-H-C) Coupled Phenomena in Buffer Materials Focusing on the Clay mineral Montmorillonite

*Kohei Ouchi¹, Haruo Sato¹ (1. Okayama Univ. (Japan))

Coffee break (10:30 AM - 10:45 AM)

10:45 AM - 11:00 AM

[OE4-06] Se immobilization in pyrite by reaction with Fe(II) and polysulfides: Impacts of aging conditions

*Paul Francisco¹, Hideaki Shiwaku², Takamitsu Ishidera¹, Yukio Tachi^1,3 (1. Nuclear Fuel Cycle Engineering Laboratories, Japan Atomic Energy Agency, Tokai, Ibaraki (Japan), 2. Materials Sciences Research Center, Japan Atomic Energy Agency, Sayo, Hyogo (Japan), 3. Horonobe Underground Research Center, Japan Atomic Energy Agency, Horonobe, Hokkaido (Japan))

11:00 AM - 11:15 AM

[OE4-07] Dry synthesis of brannerite by mechanochemical treatment

*Daisuke Akiyama¹, Yoshihiro Okamoto², Akira Kirishima¹ (1. Tohoku Univ. (Japan), 2. JAEA (Japan))

11:15 AM - 11:30 AM

[OE4-08] Geochemical modeling of cation exchange reactions in Horonobe mudstone from Northern Hokkaido, Japan

*Takeyasu Abe¹, Yoshihisa Iida¹, Hiroshi Sasamoto¹, Eiichi Ishii¹ (1. JAEA (Japan))

11:30 AM - 11:45 AM

[OE4-09] A Study on Thermodynamics of Swelling Stress of Bentonite:
Acquisition of Thermodynamic Data of Interlayer Water of K-Montmorillonite in Consideration of Alteration

*Misato Endo¹, Haruo Sato¹ (1. Okayama University (Japan))

11:45 AM - 12:00 PM

[OE4-10] Measurements of Thermodynamic Data of Water in Ca-Bentonite by Relative Humidity Method

*Kosuke Ichikawa¹, Haruo Sato¹ (1. Okayama Univ. (Japan))

12:00 PM - 12:15 PM

[OE4-11] Measurements of Thermodynamic Data of Water in Na-Bentonite in the Standard Condition by Relative Humidity Method

*Haruo Sato¹ (1. Okayama University (Japan))

Session information