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Journal Articles

Diffusion and retention behaviour of Cs in illite-added compacted montmorillonite

Ishidera, Takamitsu; Kurosawa, Seiichi*; Hayashi, Masanori*; Uchikoshi, Keiji*; Beppu, Hikari*

Clay Minerals, 51(2), p.161 - 172, 2016/05

 Times Cited Count:4 Percentile:14.18(Chemistry, Physical)

The sorption and diffusion behavior of Cs in illite-added compacted montmorillonite was investigated by through-diffusion experiment. The obtained distribution coefficient of Cs for the illite-added compacted montmorillonite was several times larger than that for the montmorillonite without illite, while no increase of effective diffusion coefficient was observed for the illite-added compacted montmorillonite. The dominant sorption site of Cs on illite is considered to be the frayed edge site (FES) considering the Cs concentration in this experiment. Therefore, the surface diffusion of Cs sorbing on the FES on illite surface was considered to be negligible in compacted montmorillonite.

JAEA Reports

Replacement technology for front acrylic panels of a large-sized glove box using bag-in / bag-out method

Sakuraba, Naotoshi; Numata, Masami; Komiya, Tomokazu; Ichise, Kenichi; Nishi, Masahiro; Tomita, Takeshi; Usami, Koji; Endo, Shinya; Miyata, Seiichi; Kurosawa, Tatsuya; et al.

JAEA-Technology 2009-071, 34 Pages, 2010/03

JAEA-Technology-2009-071.pdf:21.07MB

As a part of maintenance technology of a large-sized glove box for handling of TRU nuclides, we developed replacement technology for front acrylic panels using the bag-in/bag-out method and applied this technology to replace the deteriorated front acrylic panels at Waste Safety Testing Facility (WASTEF) in Nuclear Science Research Institute of Japan Atomic Energy Agency (JAEA). As a consequence, we could safely replace the front acrylic panels under the condition of continuous negative pressure only with partial decontamination of the glove box. We also demonstrated that the present technology is highly effective in points of safety, workability and cost as compared to the usual replacement technology for front acrylic panels of a glove box, where workers in an air-line suit replace directly the front acrylic panels in a green house.

Oral presentation

Diffusion behavior of humic acid in compacted bentonite

Iijima, Kazuki; Yoshikawa, Hideki; Kurosawa, Seiichi*

no journal, , 

Diffusion behavior of humic acid in compacted bentonite was investigated with Kunigel V1 in 0.1M NaCl solution. In case of 1.2 Mg/m$$^{3}$$ of dry density, breakthrough of the fumic acid was observed after 100 days. On the other hand, in case of 1.6 and 1.8 of dry density, no breakthrough was observed even after 500 days. Based on the measurement of size distribution of humic acid by GPC, it is suggested that relatively bigger humic acid cannot diffuse but smaller one due to the filtration effect of compacted bentonite.

Oral presentation

Diffusion coefficients of nuclides in the sedimentary rocks obtained from Horonobe URL site

Ishidera, Takamitsu; Kurosawa, Seiichi*

no journal, , 

no abstracts in English

Oral presentation

Comparison of diffusion behavior between bentonites being different in mineralogical composition

Ishidera, Takamitsu; Tran, P.*; Kurosawa, Seiichi*; Kibe, Satoshi*

no journal, , 

no abstracts in English

Oral presentation

Diffusion behavior of humic acid in compacted bentonite, 2; Effect of dry density and ionic strength on the diffusion behavior

Iijima, Kazuki; Kurosawa, Seiichi*; Tobita, Minoru*; Kibe, Satoshi*

no journal, , 

Diffusion behavior of humic acid in compacted bentonite was investigated by through-diffusion experiments under the conditions with various dry density and NaCl concentration. Limitation of filtration effect of the compacted bentonite with 1.2 Mg m$$^{-3}$$ of dry density in 1 mol dm$$^{-3}$$ of NaCl solution is around 3,000 of molecular weight, based on the molecular weight distribution of humic acid before and after the experiment measured by size exclusion chromatography.

Oral presentation

Effect of potassium on the sorption of Cs on Horonobe sedimentary rocks

Ishidera, Takamitsu; Kurosawa, Seiichi*; Kibe, Satoshi*

no journal, , 

no abstracts in English

Oral presentation

Diffusion behavior of humic acid in compacted bentonite, 3; Diffusion mechanism of humic acid and neodymium

Iijima, Kazuki; Kurosawa, Seiichi*; Tobita, Minoru*; Kibe, Satoshi*; Ouchi, Yuji*

no journal, , 

Diffusion behavior of humic acid in compacted bentonite was investigated by through-diffusion method. Concentration profile and molecular weight distribution of humic acid in the compacted bentonite indicate that only low molecular weight fraction of humic acid is likely to diffuses. Difference of diffusion behavior arising from difference of molecular weight is considered to be taken into account in evaluation of diffusion parameters.

Oral presentation

Modelling of diffusion behaviour of humic acid and Nd in the presence of humic acid in compacted bentonite

Iijima, Kazuki; Kurosawa, Seiichi*; Kibe, Satoshi*; Tobita, Minoru*; Ouchi, Yuji*

no journal, , 

Diffusion behavior of humic acid and Nd in the presence of humic acid was investigated and modeled. Breakthrough of humic acid is observed in 0.1 and 1M NaCl with 1.2-1.6 Mg/m$$^{3}$$ dry density of compacted bentonite. The presence of humic acid facilitates the migration of Nd. Diffusion Parameters were evaluated from experimental results using the one dimensional diffusion model in which migration of several Nd species with different diffusion behaviors keeping equilibrium in parallel was taken into account. Obtained diffusion parameters for humic acid and Nd will be used for prediction of diffusion behavior of radionuclides in the presence of humic acid under various conditions.

Oral presentation

Assessment method development for radionuclide migration in compacted bentonite, 3; Development of sorption/diffusion data acquisition method for high sorbing Am

Ishii, Yasuo; Seida, Yoshimi*; Tachi, Yukio; Okazaki, Mitsuhiro*; Kurosawa, Seiichi*

no journal, , 

We developed the Sorption/diffusion data acquisition method for high sorbing nuclides using trivalent actinide Am.

Oral presentation

Sorption site capacities for Cs on the sedimentary rock in Horonobe area

Ishidera, Takamitsu; Kurosawa, Seiichi*; Kibe, Satoshi*; Ouchi, Yuji*

no journal, , 

no abstracts in English

Oral presentation

Isotopic composition measurement of FP nuclides in spent LWR UO$$_{2}$$ fuel and nucleonics analysis, 2; Measurements of FP nuclides

Ito, Mitsuo; Fukaya, Hiroyuki; Ueno, Takashi; Miyata, Seiichi; Sonoda, Takashi; Usami, Hidehiko; Sakazume, Yoshinori; Kurosawa, Tatsuya; Kawasaki, Yasushi; Inagawa, Jun; et al.

no journal, , 

no abstracts in English

Oral presentation

Development of sorption/diffusion data acquisition method for high sorbiong Am and Th in Horonobe sedimentary rock

Ishii, Yasuo; Takahashi, Hiroaki; Seida, Yoshimi*; Tachi, Yukio; Nakazawa, Toshiyuki*; Kurosawa, Seiichi*; Okazaki, Mitsuhiro*

no journal, , 

We have developed Sorption/Diffusion Data Acquisition Method for High Sorbiong Am and Th in Horonobe Sedimentary Rock.

Oral presentation

Effect of dry density on activation energy of effective diffusion coefficient for deuterated water in compacted bentonite

Ishidera, Takamitsu; Kurosawa, Seiichi*; Otsuka, Shunji*; Hayashi, Masanori*; Uchikoshi, Keiji*; Suzuki, Yasuyuki*

no journal, , 

no abstracts in English

Oral presentation

Evaluation of distribution coefficients for radionuclides sorption on bentonite colloid

Ishidera, Takamitsu; Kurosawa, Seiichi*; Hayashi, Masanori*; Suzuki, Yasuyuki*

no journal, , 

In the geological disposal of high-level radioactive waste (HLW) in Japan, potential impact of bentonite colloid on the migration of radionuclides needs to be evaluated in the performance assessment of geological disposal. Japan Atomic Energy Agency (JAEA) has been investigating sorption behavior of radionuclides on bentonite colloid and developing the evaluation model for the radionuclide sorption behavior on bentonite colloid. In our previous studies, the sorption behavior of Cs and Am on bentonite colloid was well interpreted by the evaluation model based on a previously reported sorption model for non-colloidal bentonite. In the presentation, the evaluation model for distribution coefficient of radionuclides sorption on bentonite colloid will be introduced in detail and the application result of evaluation model to the sorption behavior of Np on bentonite colloid will be shown.

Oral presentation

Leaching of iodine and chlorine into alkaline groundwater in biomicrite at Maqarin

Ishidera, Takamitsu; Kurosawa, Seiichi*; Otsuka, Shunji*; Uchikoshi, Keiji*; Kamei, Gento; Alexander, W. R.*

no journal, , 

no abstracts in English

Oral presentation

Investigation of sorption reversibility of Np(V) on bentonite colloid

Nakata, Kotaro*; Ishidera, Takamitsu; Kurosawa, Seiichi*; Hayashi, Masanori*; Beppu, Hikari*; Sukegawa, Akihiro*

no journal, , 

no abstracts in English

Oral presentation

Investigation of sorption reversibility of Am(III) and the other nuclides on bentonite colloids

Nakata, Kotaro*; Ishidera, Takamitsu; Kurosawa, Seiichi*; Hayashi, Masanori*; Beppu, Hikari*; Sukegawa, Akihiro*

no journal, , 

no abstracts in English

18 (Records 1-18 displayed on this page)
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