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Journal Articles

A Study of methods to prevent piping and erosion in buffer materials intended for a vertical deposition hole at the Horonobe Underground Research Laboratory

Jo, Mayumi*; Ono, Makoto*; Nakayama, Masashi; Asano, Hidekazu*; Ishii, Tomoko*

Geological Society Special Publications, 482, 16 Pages, 2018/09

 Times Cited Count:1 Percentile:17.46

Journal Articles

Observation of momentum-resolved charge fluctuations proximate to the charge-order phase using resonant inelastic X-ray scattering

Yoshida, Masahiro*; Ishii, Kenji; Naka, Makoto*; Ishihara, Sumio*; Jarrige, I.*; Ikeuchi, Kazuhiko*; Murakami, Yoichi*; Kudo, Kazutaka*; Koike, Yoji*; Nagata, Tomoko*; et al.

Scientific Reports (Internet), 6, p.23611_1 - 23611_8, 2016/03

 Times Cited Count:1 Percentile:12.92(Multidisciplinary Sciences)

Journal Articles

Tackling contamination of farmland by using NaI(Tl) spectrometer and gamma camera

Yin, Y.-G.; Suzui, Nobuo; Kawachi, Naoki; Yamaguchi, Mitsutaka; Tanoi, Keitaro*; Ishii, Satomi; Nakanishi, Tomoko*; Chino, Mitsuo*; Nakamura, Shinichi*; Watabe, Hiroshi*; et al.

Hoshasen To Sangyo, (133), p.45 - 48, 2012/12

no abstracts in English

JAEA Reports

Experimental study of alteration of bentonite coexisting iron material

Sasamoto, Hiroshi; Ishii, Tomoko*; Sato, Hisao*; Sazarashi, Masami

JAEA-Research 2010-030, 64 Pages, 2010/09

JAEA-Research-2010-030.pdf:15.41MB

It is necessary to evaluate the alteration behavior of buffer material by interactions of overpack (iron) and buffer (bentonite) materials for geological disposal of high level radioactive waste. In the present study, laboratory experiments were carried out for the better understanding of phenomena caused by iron-bentonite (smectite) interactions. Before conducting the experiments, literature survey was performed to summarize the existing knowledge about iron-bentonite interactions and to identify the dominant factors affecting the alteration behavior. As the results of experiment, experimental conditions caused remarkable alteration, secondary minerals suggested as alteration product, different behavior of alteration between batch and compacted systems etc. were revealed.

JAEA Reports

Reliability improvement of hydro-geochemical and hydrogeological model on geological environment in Horonobe Underground Research Laboratory project; Report on the 2005 FY research (Joint research)

Hama, Katsuhiro; Kunimaru, Takanori; Kurikami, Hiroshi; Sasamoto, Hiroshi; Takahashi, Yasuhiro*; Haginuma, Masashi*; Ishii, Tomoko*; Matsuo, Yuji*

JAEA-Research 2006-070, 93 Pages, 2006/09

JAEA-Research-2006-070.pdf:23.48MB
JAEA-Research-2006-070(errata).pdf:0.08MB

Japan Atomic Energy Agency and Institute of Research and Innovation have started collaborative study in order to enhance the reliability of technology for the geological disposal of High-level Radioactive Waste (HLW) since 2005 fiscal year. In this collaborative study, the analysis has carried out to estimate long-term evolution of groundwater chemistry and groundwater flow. The study items and results are summarized in this report. (1) Groundwater Chemistry. The following items have been carried out: 1. Multivariate analysis. 2. Estimation of distribution of groundwater chemistry. 3. Construction of geochemical model. (2) Groundwater Flow: 1. Construction of geological model. 2. Construction of hydrogeological model. 3. Groundwater flow analysis. The modeling work will be continued in 2006 fiscal year. The applicability of the modeling methodology will also be evaluated.

Journal Articles

$$^{18}$$F used as tracer to study water uptake and transport imaging of a cowpea plant

Nakanishi, Tomoko*; Tanoi, Keitaro*; Yokota, Harumi*; Kang, D.-J.*; Ishii, Ryuichi*; Ishioka, Noriko; Watanabe, Satoshi; Osa, Akihiko; Sekine, Toshiaki; Matsuhashi, Shimpei; et al.

Journal of Radioanalytical and Nuclear Chemistry, 249(2), p.503 - 507, 2001/08

We present the water uptake ability of cowpea ($$it {Vigna unguliculata Walp.}$$) which has been regarded as one of the most drought resistant species among the pulse crops. It has been suggested that in the lower part of the stem, parenchymatous tissue for storing water had been developed for the function of deought resistance. We confirmed that in this tissue, water amount was high compared to the other stems by neutron radiography. Then the water uptake manner was measured by positron emitting tracer imaging system (PETIS) using $$^{18}$$F labeled water produced by a cyclotron. Comparing the water uptake manner of cowpea plant with that of common bean, cowpea plant was found to maintain high water uptake activity after drying treatment, suggesting the high drought resistant character.

JAEA Reports

The Development of the fluid heat transfer analysis method of high level radioactive wastes in storage, 3

Oshima, Tsutomu*; Ishii, Yoshikane*; Kodama, Akio*; Narusawa, Tomoko*

PNC TJ199 84-20VOL1, 43 Pages, 1984/10

PNC-TJ199-84-20VOL1.pdf:1.19MB

None

Oral presentation

Experimental studies of iron-bentonite interactions under high temperature condition

Sasamoto, Hiroshi; Sazarashi, Masami; Ishii, Tomoko*; Sato, Hisao*; Kato, Hiroyasu*

no journal, , 

To investigate bentonite-iron interaction under high temperature condition, alteration experiments considering several factors (smectite composition, solution chemistry, iron-bentonite ratio) which were believed to affect on bentonite alteration were conducted with different experimental conditions. As the results, it was suggested that the factors considered in this study could also significantly affect on bentonite alteration in addition to temperature condition.

Oral presentation

Experimental investigation of iron-bentonite interactions under high temperature condition

Sasamoto, Hiroshi; Sazarashi, Masami; Ishii, Tomoko*; Sato, Hisao*; Kato, Hiroyasu*

no journal, , 

To investigate bentonite-iron interaction under high temperature condition, alteration experiments considering several factors (smectite composition, solution chemistry, iron-bentonite ratio) which were believed to affect on bentonite alteration were conducted with different experimental conditions. As the results, it was suggested that the factors considered in this study could also significantly affect on bentonite alteration in addition to temperature condition.

Oral presentation

Studies on coupled behavior of the high-level radioactive waste repository

Sasamoto, Hiroshi; Sazarashi, Masami; Ishii, Tomoko*; Kato, Hiroyasu*; Sugiyama, Kazutoshi*

no journal, , 

Regarding to alteration of bentonite coexisting with iron material, laboratory experiments with different temperature and iron-bentonite (I/B) ratio and literature surveys for bentonite alteration in the natural system were conducted. As the results, the conditions which promote the alteration of smectite significantly were estimated approximately. Additionally, the important alteration products necessary for evaluation of smectite alteration were summarized by literature surveys. Such information will be useful for evaluation of smectite alteration considering the conditions of time and duration interested.

Oral presentation

Tackling contamination of farmland by using NaI(Tl) spectrometer and $$gamma$$ camera

Yin, Y.-G.; Kawachi, Naoki; Suzui, Nobuo; Ishii, Satomi; Yamaguchi, Mitsutaka; Tanoi, Keitaro*; Nakanishi, Tomoko*; Chino, Mitsuo*; Nakamura, Shinichi*; Watabe, Hiroshi*; et al.

no journal, , 

no abstracts in English

Oral presentation

Development of measuring technique for radiocesium; Simple method for analysis of agricultural products, imaging of the dynamics of radiocesium into plant from the soil

Yin, Y.-G.; Suzui, Nobuo; Kawachi, Naoki; Yamaguchi, Mitsutaka; Tanoi, Keitaro*; Nakanishi, Tomoko*; Chino, Mitsuo*; Nakamura, Shinichi*; Watabe, Hiroshi*; Yamamoto, Seiichi*; et al.

no journal, , 

no abstracts in English

Oral presentation

Structural characteristics of the active site of $$beta$$-Lactamase TOHO-1 determined by combined high-resolution neutron and X-ray crystallography

Kurihara, Kazuo; Sunami, Tomoko; Yamada, Mitsugu; Nitanai, Yasushi*; Okazaki, Nobuo; Adachi, Motoyasu; Tamada, Taro; Shimamura, Tatsuro*; Miyano, Masashi*; Ishii, Yoshikazu*; et al.

no journal, , 

To help resolve questions regarding the catalytic activity of $$beta$$-lactamase, the crystal structure of an unliganded form of the $$beta$$-lactamase Toho-1 with double mutation R274N/R276N (Toho-1/NN) has been determined by the use of high-resolution neutron and X-ray diffraction data. A large single crystal of Toho-1/NN with a dimension of 2.6 $$times$$ 2.5 $$times$$ 1.3 mm$$^{3}$$ was used to collect 100 K neutron diffraction data to 1.5 ${AA}$ resolution and X-ray diffraction data to 1.4 ${AA}$ resolution. The structural model of Toho-1/NN was refined to an R-factor of 19.7% using a program PHENIX. The structure showed that Glu166, a catalytic residue of Toho-1, was protonated even at pH 7 nonetheless for the close location to the positively charged side chain amino group (-NH3$$_{+}$$) of Lys73. It is also found that there is a hydration water network bridging between the protonated Glu166 and the oxyanion hole comprising two main chain nitrogen atoms of Ser70 and Ser237. The neutron structure analysis also revealed the clear configuration of the proposed catalytic water molecule bridging Glu166 and Ser70. These observations are important to understand the catalytic action of $$beta$$-lactamase Toho-1.

Oral presentation

Loading effect on Eu(III) binding to groundwater humic acid; Application of NICA-Donnan model

Terashima, Motoki; Saito, Takumi; Ishii, Tomoko*; Akagi, Yosuke*; Tachi, Yukio

no journal, , 

no abstracts in English

Oral presentation

Development of inventory evaluation methods for the radioactive wastes of Fukushima Daiichi Nuclear Power Station, 8; Evaluation of distribution coefficient of radionuclides on zeolite

Ishidera, Takamitsu; Tachi, Yukio; Ashida, Takashi; Ishii, Tomoko*; Akagi, Yosuke*; Takeda, Chizuko*

no journal, , 

no abstracts in English

Oral presentation

Research for the erosion of buffer material with the vertical disposal concept, 3; In situ tests on engineering scale at Horonobe URL

Ono, Makoto*; Motoshima, Takayuki*; Shirase, Mitsuyasu*; Yokoyama, Satoshi*; Jo, Mayumi*; Ishii, Tomoko*; Nakayama, Masashi; Ono, Hirokazu

no journal, , 

To understand phenomenon of buffer material erosion in the vertical disposal concept, in situ tests on engineering scale have been carried out at Horonobe URL. As results of water injection with flow rate control, when water flowed in a continuous large flow rate, buffer materials did not swell enough to stop the water flow and the water flow path was confirmed to be formed by aggregated into a single pipe. Further, it was suggested that water pressure of the injection side contributes to the erosion of buffer materials.

Oral presentation

Research for the erosion of buffer material with the vertical disposal concept, 4; Numerical analysis of inflow control into the disposal pits using discrete fracture network model

Atsumi, Hiroyuki*; Masumoto, Kazuhiko*; Ishii, Tomoko*; Jo, Mayumi*; Nakayama, Masashi; Ono, Hirokazu

no journal, , 

In the vertical disposal concept of high level radioactive waste, it is important to evaluate influence of the groundwater inflow into the disposal pits against performance of buffer material as an artificial barrier because the inflow might cause the erosion of buffer material. The target of this study was to estimate the inflow control technique (e.g. grouting) around the disposal pits using numerical analysis. The model for the simulation should be a discrete fracture network model when the groundwater mainly flows along the fractures in the rock mass, therefore, the discrete fracture network model was selected to estimate the inflow control technique in this study. The results of numerical flow analysis showed that the effectiveness of grouting for the disposal pits and the impact of grouting for the other disposal pits or surrounding disposal tunnel could be evaluated quantitatively.

Oral presentation

Complexation of trace Eu with humic acid isolated from deep groundwater in the Horonobe underground research laboratory site, Japan

Terashima, Motoki; Saito, Takumi*; Ishii, Tomoko*; Ito, Miki*; Akagi, Yosuke*; Tachi, Yukio

no journal, , 

no abstracts in English

Oral presentation

Study on methods to prevent piping and erosion in buffer materials intended for a vertical disposal pit, at Horonobe URL

Jo, Mayumi*; Iwatani, Takafumi*; Kawakubo, Masahiro*; Ishii, Tomoko*; Ono, Makoto*; Nakayama, Masashi

no journal, , 

For the purpose of "maintaining the soundness of the artificial barrier", we are studying "restraints on the outflow of the buffer material". We conducted an experiment of a scale of 30 cm to 1 m in an actual underground environment and confirmed the occurrence of the buffer material outflow under water inflow conditions. The experiment in this study was undertaken in order to acquire the necessary data for considering a method to control the outflow of the buffer material.

Oral presentation

Countermeasures against piping and erosion of bentonite buffer; Piping inhibition due to pre-hydration

Shirase, Mitsuyasu*; Ishii, Tomoko*; Kobayashi, Ichizo*; Jo, Mayumi*; Ono, Makoto*; Nakayama, Masashi

no journal, , 

A candidate emplacement concept of the engineered barrier system (EBS) for geological disposal in Japan is vertical emplacement option, which has a certain gap is between the wall of the disposal hole and the buffer material. This gap is considered to be filled with the swollen buffer material (self-sealing function) when the underground water is infiltrated to the buffer material. However, some underground water flow conditions such as a pipe-shaped water channel induce erosion of the buffer material, which causes lowering of the function of the EBS. Therefore, RWMC (Radioactive Waste Management Funding and Research Center) studies engineering countermeasures against piping and erosion. RWMC used an intentional water supply system to test the pre-hydration of bentonite buffers.

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