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Koike, Ayaka*; Takubo, Yusaku*; Anraku, Sohtaro; Kawakita, Ryohei
NUMO-TR-24-03, p.62 - 64, 2024/10
no abstracts in English
Koike, Ayaka*; Takubo, Yusaku*; Mihara, Morihiro
NUMO-TR-24-03, p.81 - 84, 2024/10
no abstracts in English
Matsubara, Ryuta*; Takubo, Yusaku*; Iwata, Hajime; Inagaki, Yaohiro*; Okubo, Takahiro*
NUMO-TR-24-01, p.104 - 108, 2024/05
no abstracts in English
Takubo, Yusaku*; Takayama, Yusuke; Ishida, Keisuke*; Fujisaki, Kiyoshi*
NUMO-TR-24-01, p.109 - 112, 2024/05
no abstracts in English
Takubo, Yusaku*; Takayama, Yusuke; Ichikawa, Nozomi*; Ishida, Keisuke*; Fujisaki, Kiyoshi*
NUMO-TR-22-02, p.68 - 71, 2023/03
no abstracts in English
Takubo, Yusaku*; Takayama, Yusuke; Idiart, A.*; Tanaka, Tatsuya*; Ishida, Keisuke*; Fujisaki, Kiyoshi*
Proceedings of 2022 International High Level Radioactive Waste Management Conference (IHLRWM 2022) (Internet), p.906 - 915, 2022/11
no abstracts in English
Takubo, Yusaku*; Takayama, Yusuke; Idiart, A.*; Toya, Naruhisa*; Ishida, Keisuke*; Fujisaki, Kiyoshi*
no journal, ,
Coupled THC analysis below 100 degrees was performed for existing studies (laboratory tests and Full-scale Engineered Barriers Experiment (FEBEX) in-situ tests) using PFLOTRAN, which has been applied as a TH/THC coupled analysis code. By comparing the results of each test measurement and analysis, input parameters that are considered to have a significant impact on the analysis result of the chemical field were investigated.
Takubo, Yusaku*; Takayama, Yusuke; Kawama, Daisuke*; Mitsuyama, Kazuaki*; Sugita, Yutaka; Ishida, Keisuke*
no journal, ,
In order to understand the phenomena and conditions that should be noted when evaluating the infiltration behavior of water in the buffer material during the re-saturation process of the engineered barrier system, Authors are working on a comparative evaluation of previous test results and coupled analysis results. The development status of the technology to evaluate the influence of thermal, chemical, and mechanical processes using coupled analysis is presented.
Takubo, Yusaku*; Takayama, Yusuke; Ishida, Keisuke*
no journal, ,
The preliminary results of coupled TH analysis for laboratory infiltration test data using FEBEX bentonite reported by Takubo et al., (2022) showed that some input parameters of bentonite, such as an intrinsic permeability and parameters related to the retention function, are key parameters that have large effects on the coupled TH analysis results. However, it is known that bentonite has different hydraulic properties such as permeability and water retention curves depending on its origin and properties, and the key parameters for evaluating coupled TH phenomena may be different for other bentonites. In this study, we investigated parameter sensitivity of coupled TH analysis model for Kunigel V1 using experimental data measured in previous laboratory tests in order to identify the key parameters that should be focused on when evaluating coupled TH phenomena in Kunigel V1. The large and small influential parameters on the analytical evaluation of hydraulic fields were consistent with the key parameters of the FEBEX bentonite. Although there are only limited comparative examples, this result indicates that key parameters related to coupled TH phenomena may be common to all bentonites. The information of the key parameters can be used to prioritize the parameters that need to be precisely obtained from experiments, and it is expected to promote efficiency in future research and development about bentonite.
