Evolution of the reaction and alteration of granite with Ordinary Portland cement leachates; Sequential flow experiments and reactive transport modelling

Bateman, K.*; Murayama, Shota*; Hanamachi, Yuji*; Wilson, J.*; Seta, Takamasa*; Amano, Yuki; Kubota, Mitsuru*; Ouchi, Yuji*; Tachi, Yukio

Minerals (Internet), 12(7), p.883_1 - 883_20, 2022/07

https://doi.org/10.3390/min12070883

Reaction and alteration of mudstone with Ordinary Portland Cement and Low Alkali Cement pore fluids

Bateman, K.; Amano, Yuki; Kubota, Mitsuru*; Ouchi, Yuji*; Tachi, Yukio

Minerals (Internet), 11(6), p.588_1 - 588_19, 2021/06

https://doi.org/10.3390/min11060588

Field emission-type scanning electron microscope for examination of irradiated fuels

Yasuda, Ryo; Mita, Naoaki; Nishino, Yasuharu; Nakata, Masahito; Nozawa, Yukio; Harada, Katsuya; Kushida, Teruo; Amano, Hidetoshi

Nuclear Technology, 151(3), p.341 - 345, 2005/09

https://doi.org/10.13182/NT05-A3656

The Field Emission type Scanning Electron Microscope (FE-SEM), which is one of effective tools for observation of micr-structures, was installed at the Reactor Fuel Examination Facility (RFEF) in JAERI. The FE-SEM is equipped in a large shield vessel with remote handling systems to keep safety of operators and is modified to enable to manipulate high radioactive materials. The Energy Dispersive Spectrometer (EDS) with radiation-shielded collimators has been also equipped on the FE-SEM to determine element compositions of the observed material samples. Characterization tests were carried out using deposited gold film and Zircaloy cladding tubes with hydrides to confirm the machine performance after the modifications. In the results of the tests, high-resolution images without some noises and fogs were obtained with high magnification above 10,000. Those results show that the FE-SEM keeps the high performance after some improvements and modifications for shielding -rays and handling radioactive samples.

A Study of existing experimental data and validation process for evaluated high energy nuclear data; Report of task force on integral test for JENDEL high energy file in japanese nuclear data committee

Oyama, Yukio; ; Watanabe, Yukinobu*; Kawano, Toshihiko*; Numajiri, M.*; Ueki, Kotaro*; ; Yamano, Naoki*; Kosako, Kazuaki*; ; et al.

JAERI-Review 98-020, 130 Pages, 1998/11

JAERI-Review-98-020.pdf:6.4MB

no abstracts in English

Benchmark problems for intermediate and high energy accelerator shielding

; Sakamoto, Yukio; Tanaka, Shunichi; ; Fukahori, Tokio; ; Sasamoto, Nobuo; Tanaka, Susumu; Nakamura, Takashi*; Shin, Kazuo*; et al.

JAERI-Data/Code 94-012, 90 Pages, 1994/09

JAERI-Data-Code-94-012.pdf:2.26MB

no abstracts in English

Evolution of the reaction and alteration of mudstone with cement leachate; Flow experiments and reactive-transport modelling

Bateman, K.; Amano, Yuki; Tachi, Yukio

no journal, , 

Effect of humic acid in groundwater on the sorption behavior of Eu on sedimentary rocks deep underground

Eguchi, Ayano; Kimuro, Shingo; Amano, Yuki; Tachi, Yukio

no journal, , 

no abstracts in English

In-situ reaction and alteration of mudstone-cement interfaces at the Horonobe URL; Comparison between OPC and HFSC

Dei, Shuntaro; Amano, Yuki; Sugiura, Yuki; Shibata, Masahito*; Negishi, Kumi*; Yokoyama, Tatsunori; Kagami, Saya; Takeda, Masaki; Mochizuki, Akihito; Sakurai, Akitaka; et al.

no journal, , 

no abstracts in English

Use of natural analogues to develop and test models of radionuclide release and transport in uplift / erosion scenarios

Klein, L.*; Hardie, S.*; McKinley, I.*; Tachi, Yukio; Shibata, Masahiro; Amano, Yuki; Takase, Hiroyasu*

no journal, , 

The uplift / erosion is treated as a special perturbation scenario for the safety assessment of the geological disposal, due to the Japanese tectonic setting, the impact of uplift must be considered as part of "likely" repository evolution. In an initial study, a simple uplift and erosion scenario was assessed with resultant changes in solubility and sorption of key radionuclides. A special challenge here is development of models and associated databases to quantify the impact of rock mechanical, hydrogeological and bio-geochemical changes on radionuclide migration both in the EBS and in the geosphere. There are great uncertainties with any laboratory studies to investigate the processes involved and therefore natural analogues have great potential here. The paper will list and discuss the key safety-relevant processes and potential analogue studies by considering both data mining of existing knowledge bases and also new projects that are specifically focused on this application.

Study of complex magnetic structures in frustrated magnets by means of polarized neutrons

Kakurai, Kazuhisa; Wakimoto, Shuichi; Matsuda, Masaaki*; Ishiwata, Shintaro*; Okuyama, Daisuke*; Taguchi, Yasujiro*; Tokura, Yoshiki*; Nishi, Masakazu*; Nakajima, Taro*; Mitsuda, Setsuo*; et al.

no journal, ,