Yuta Fukatsu

Diffusion and sorption of Cs in the mudstone matrix at the Horonobe URL: comparative experimental and modeling analysis between in situ and laboratory conditions

Masaki Takeda, Hirokazu Ohno, Tsuyoshi Ito, Kenji Yotsuji et autres

Diffusion and sorption of radionuclides in potential host rocks are key processes controlling the safe geological disposal of radioactive waste. To set reliable parameters of diffusion and sorption relevant to safety assessment, it is necessary to understand these processes under laboratory and …

jp (code pays fourni par la source)

Methodology for evaluating matrix diffusion and sorption parameters in crystalline rocks: Application to laboratory and in-situ diffusion experiments at the Grimsel Test Site

Yuta Fukatsu, Tomomi Oguri, Takafumi Hamamoto, Keisuke Ishida et autres

jp, ca, ch (code pays fourni par la source)

Role of biotite content and structure in controlling Cesium diffusion in granitic rocks

Yuta Fukatsu, Qinhong Hu, Yukio Tachi

jp, cn (code pays fourni par la source)

Diffusion of Cs + , I − and HDO onto pre-Neogene sedimentary rocks

Linyi Hou, Yuta Fukatsu, Shunichi Okamoto, Kanako Toda et autres

This study investigates the diffusion behaviors of Cs+, I−, and HDO in a pre-Neogene sedimentary rock as a potential host rock for high-level radioactive waste (HLW) disposal in Japan. Through-diffusion experiments were conducted to reveal distinct patterns in their breakthrough curves. Cs+ …

jp (code pays fourni par la source)

Modeling of a radionuclide transport experiment in granitic rock matrix at the Grimsel Test Site (Switzerland). The role of advection.

Josep M. Soler, Deby Jurado, Maarten W. Saaltink, Lurdes Martínez Mínguez et autres

Within the framework of the GTS-LTD project (Grimsel Test Site – Long-Term Diffusion), a radionuclide transport experiment in unfractured granitic rock matrix was performed. Grimsel groundwater containing several radionuclide tracers (3H as HTO, 36Cl−, 22Na+, 134Cs+, 133Ba2+) was continuously circulated through a …

es, ch, jp, fi, cz (code pays fourni par la source)

Predictive and Inverse Modeling of a Radionuclide Diffusion Experiment in Crystalline Rock at ONKALO (Finland)

Josep M. Soler, Pekka Kekäläinen, Veli-Matti Pulkkanen, Luis Moreno et autres

The REPRO-TDE test was performed at a depth of about 400 m in the ONKALO underground research facility in Finland. Synthetic groundwater containing radionuclide tracers [tritiated water tracer (HTO), 36Cl, 22Na, 133Ba, and 134Cs] was circulated for about 4 years in a …

es, fi, se, cz, jp, kr, us (code pays fourni par la source)

Petrophysical properties of representative geological rocks encountered in carbon storage and utilization

Qinhong Hu, Qiming Wang, Tao Zhang, Chen Zhao et autres

This study evaluates petrophysical properties (especially porosity, permeability, tortuosity, and diffusivity) of representative geological rocks in the context of injectivity, storage space, and caprock integrity for effective utilization and long-term storage of carbon dioxide. A total of 10 geological rocks were selected …

us, cn, jp (code pays fourni par la source)

Pore connectivity influences mass transport in natural rocks: Pore structure, gas diffusion and batch sorption studies

Xiaoqing Yuan, Qinhong Hu, Xiang Lin, Chen Zhao et autres

us, cn, jp, fi (code pays fourni par la source)

New Approach To Understanding the Experimental 133Cs NMR Chemical Shift of Clay Minerals via Machine Learning and DFT-GIPAW Calculations

Takahiro Ohkubo, Akihiro Takei, Yukio Tachi, Yuta Fukatsu et autres

Structural determination of adsorbed atoms on layered structures such as clay minerals is a complex subject. Radioactive cesium (Cs) is an important element for environmental conservation, so it is vital to understand its adsorption structure on clay. The nuclear magnetic resonance (NMR) …

jp (code pays fourni par la source)

Microscopic pore structure and macroscopic fluid flow-chemical transport in host rocks and barrier materials

Qiming Wang, Qinhong Hu, Chen Zhao, Tao Zhang et autres

Fluid flow and chemical transport in porous media are the macroscopic consequences of pore structure, which integrates geometry (e.g., pore size and surface area, pore-size distribution) and topology (e.g., pore connectivity) [1]. Low-permeability geological media whose pores are poorly interconnected will exhibit …

cn, us, jp (code pays fourni par la source)

Diffusion of tritiated water, 137Cs+, and 125I− in compacted Ca-montmorillonite: Experimental and modeling approaches

Yuta Fukatsu, Kenji Yotsuji, Takahiro Ohkubo, Yukio Tachi

Mechanistic understanding and predictive modeling of radionuclide diffusion in Na- and Ca-montmorillonite are essential to evaluate the long-term evolution of the bentonite barrier and their impact on radionuclide migration during geological disposal of radioactive wastes . Thus, the diffusion behavior of 137 …

jp (code pays fourni par la source)

Pore distribution of compacted Ca-montmorillonite using NMR relaxometry and cryoporometry: Comparison with Na-montmorillonite

Takahiro Ohkubo, Akio Yamazaki, Yuta Fukatsu, Yukio Tachi

jp (code pays fourni par la source)