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JAEA Reports

Study of analytical technique concerned with metal organic complexes in groundwater

Tochigi, Yoshikatsu*; Kanno, Takeshi*; Ueno, Shunichiro*; Kubota, Nobuhiko*; Nishino, Junnya*; Fukunaga, Sakae*

JNC TJ7400 2005-017, 49 Pages, 2004/03

JNC-TJ7400-2005-017.PDF:12.08MB

The analytical procedure is investigated and examined with the aim of considering complex stability constant concerned with abundance ratio of metal ion / organic complexes dissolved in groundwater. The condenser of organic material in groundwater and experimental system for simulating subsurface environment are constructed and the experiment.

JAEA Reports

Study on Microbial Influence Assessment in Geological Disposal (II) (Summary Report)

Fukunaga, Sakae*; Iwata, Yumiko*; Kanno, Takeshi*; Kudo, Akira*

JNC TJ8400 2003-070, 45 Pages, 2003/02

JNC-TJ8400-2003-070.pdf:0.13MB

This report summarizes two investigations concerned with microbial influence in geological disposal facilities. 1)Literature survey on simulation models for the microbial-influence evaluation, 2) Experiment for the interaction between bacteria and Pu at Eh=-135mV.

JAEA Reports

Study on Microbial Influence Assessment in Geological Disposal (II)

Fukunaga, Sakae*; Iwata, Yumiko*; Kanno, Takeshi*; Kudo, Akira*

JNC TJ8400 2003-069, 73 Pages, 2003/02

JNC-TJ8400-2003-069.pdf:0.39MB

This report summarizes two investigations concerned with microbial influence in geological disposal facilities. 1)Literature surevey on simulation models for the microbial-influence evaluation. 2)Interaction between Sulfate reducing bacteria(SRB) and Pu. For simulation models, we found some papers on gas production, geochemistry, microbial corrosion and microbial amount. To make the microbial-influence evaluation more reliable, it will be necessary to study subjects such as biodegradability of organic matter, microbial amount and certification of models. The sorption experiment for Pu onto SRB was conducted. It resulted in that effects of sterilization on the distribution coefficientat were not evident at Eh=-135mV.

JAEA Reports

Study on microbial influence assessment in geological disposal

Fukunaga, Sakae*; Nakayama, Mamoru*; Jintoku, Takashi*; ; Kudo, Akira*

JNC TJ8400 2002-037, 68 Pages, 2002/02

JNC-TJ8400-2002-037.pdf:0.28MB

We conducted the following four investigations concerned with microbial influence in geological disposal facilities. (1)Improvement of the FEP dictionary and investigation on chemical evolution of nitrate by microbes. (2)Experimental estimation of microbial mobility in compacted Na bentonite saturated by synthetic seawater with 30wt% silica sand and Ca bentonite with 30wt% silica sand. (Both dry densities are 1.6 g/cm$$^{3}$$.) (3)Habitation of microbes in Na rich bentonite deposit and Ca rich one. (4)Interaction between SRB (sulfate reducing bacteria) and Np in a reducing environment at Eh=-85mV. As the result, it was revealed that (1)microbial activity in near field rock and microbial denitrification of nitrate under the existence of electron donor are important, (2)microbes didn't move in Na bentonite in 3 weeks and moved to the distance of 20mm in Ca bentonite, and (3)microoragnisms existed at the inside of the deposits. (4) The difference between distribution coefficient of Eh=-85mV and Eh=-500mV was evaluated.

JAEA Reports

Study on microbial influence assessment in geological disposal

Fukunaga, Sakae*; Nakayama, Mamoru*; Jintoku, Takashi*; ; Kudo, Akira*

JNC TJ8400 2002-036, 186 Pages, 2002/02

JNC-TJ8400-2002-036.pdf:1.34MB

We conducted the following four investigations concerned with microbial influence in geological disposal facilities. (1)Improvement of the FEP dictionary and investigation on chemical evolution of nitrate by microbes. (2)Experimental estimation of microbial mobility in compacted Na bentonite saturated by synthetic seawater with 30wt% silica sand and Ca bentonite with 30wt% silica sand. (Both dry densities are 1.6 g/cm$$^{3}$$.) (3)Habitation of microbes in Na rich bentonite deposit and Ca rich one. (4)Interaction between SRB (sulfate reducing bacteria) and Np in a reducing environment at Eh=-85mV. As the result, it was revealed that (1)microbial activity in near field rock and microbial denitrification of nitrate under the existence of electron donor are important, (2)microbes didn't move in Na bentonite in 3 weeks and moved to the distance of 20mm in Ca bentonite, and (3)microoragnisms existed at the inside of the deposits. (4)The difference between distribution coefficient of Eh=-85mV and Eh=-500mV was evaluated.

JAEA Reports

Study on microbial transport and adsorption behavior on engineering barrier for geological disposal of radioactive wastes

Fukunaga, Sakae*; Yokoyama, Hidekazu*; Arai, Kazuhiro*; Asano, Hidekazu*; Senjyu, Takafumi*; Kudo, Akira*

JNC TJ8400 2000-030, 54 Pages, 2000/02

JNC-TJ8400-2000-030.pdf:1.69MB

It is easy to assume from the past data that microbial transport do not find at 100%-sodium bentonite. Microbial transport do not find at 100%-calcium bentonite too. There are no effects to distribution ration (Kd) of Neptunium (Np) and Plutonium (Pu) with bentonite by sterilizing on low Eh condition (Eh= -500mv). Kd values of Np and Pu show behavior, which are increasing on the hard acidic and alkali conditions. Especially, Kd values of Pu shows one of Kd value is about 100 ml/g on pH=3$$sim$$6, but the other of Kd value is about 400,000 ml/g on pH=13. Precipitating plutonium hydrates occurred the large Kd value on alkali condition.

JAEA Reports

Study on microbial transport and adsorption behavior on engineering barrier for geological disposal of radioactive wastes

Fukunaga, Sakae*; Yokoyama, Hidekazu*; Arai, Kazuhiro*; Asano, Hidekazu*; Senjyu, Takafumi*; Kudo, Akira*

JNC TJ8400 2000-029, 36 Pages, 2000/02

JNC-TJ8400-2000-029.pdf:1.28MB

It is easy to assume from the past data that microbial transport do not find at 100%-sodium bentonite. Microbial transport do not find at 100%-calcium bentonite too. There are no effects to distribution ration (Kd) of Neptunium (Np) and Plutonium (Pu) with bentonite by sterilizing on low Eh condition (Eh = -500mv). Kd values of Np and Pu show behavior, which are increasing on the hard acidic and alkali conditions. Especially, Kd values of Pu shows one of Kd value is about 100 ml/g on pH = 3$$sim$$6, but the other of Kd value is about 400,000 ml/g on pH = 13. Precipitating plutonium hydrates occurred the large Kd value on alkali condition.

Journal Articles

Experimental Investigation on the Active Range of Sulfate-Reducing Bacteria for Geological Disposal

Fukunaga, Sakae*; Yoshikawa, Hideki; Fujiki, K.*; Asano, Hidekazu*

Materials Research Society Symposium Proceedings, Vol.353, p.173 - 180, 1995/00

None

JAEA Reports

Experimental investigation of activities and tolerance of sulphate-reducting bacteria under alkaline and reducing condition

Mano, Tadashi; Yoshikawa, Hideki; Fukunaga, Sakae*; Yui, Mikazu; Yamagata, Junji*; Asano, Hidekazu*; Yamanaka, Yumiko*

PNC TN8410 94-117, 60 Pages, 1993/03

None

JAEA Reports

Investigation of microbiologial effect on geological disposal

Yoshikawa, Hideki; Yui, Mikazu; Sasaki, Noriaki; Fukunaga, Sakae*; Asano, Hidekazu*;

PNC TN8410 92-013, 232 Pages, 1992/01

PNC-TN8410-92-013.pdf:5.04MB

Geomicrobiology for the geological disposal of radioactive wastes and the assessment of potential microbial effects on chemical and physical changes in repository environments and nuclide transport have been pointed out to be of cardinal importance. However, the detailed effects of microbes are poorly understood. In order to study microbial activities in underground and their effects on a repository and to know the recent study status, a literature survey was performed. In addition to this, the current research activities of major research laboratories in the world were investigated. And microbiology related meetings and conferences were also searched. In the literature survey, biodegradation and physical disruption of materials, gas generation, alteration of ground-water chemistry and the direct uptake of radionuclides were identified as factors which potentially affect the nuclide containment capability of the repository. And through the search for laboratories and meetings, information on the most recent status of biological study on the underground repository and on conferences related to geomicrobiology were obtained, respectively.

Oral presentation

Bio-availability of organic matter in groundwater

Fukunaga, Sakae*; Miyasaka, Iku*; Yoshikawa, Hideki

no journal, , 

no abstracts in English

Oral presentation

Effect of the electron acceptor on microbial growth and metabolic activity

Fukunaga, Sakae*; Ishii, Kosuke*; Miyasaka, Iku*; Asano, Takahiro; Sasaki, Yoshito; Yoshikawa, Hideki

no journal, , 

no abstracts in English

Oral presentation

Development of a simulation code for the assessment of microbial influence on the safety performance of natural barrier in a repository

Miyasaka, Iku*; Fukunaga, Sakae*; Kanno, Takeshi*; Tochigi, Yoshikatsu; Namba, Kenji*

no journal, , 

no abstracts in English

Oral presentation

Estimation of growth parameters corresponding to microbial communities in laboratory anaerobic aquifer columns

Fukunaga, Sakae*; Ishii, Kosuke*; Miyasaka, Iku*; Asano, Takahiro; Sasaki, Yoshito; Yoshikawa, Hideki

no journal, , 

no abstracts in English

Oral presentation

Experiments using laboratory columns to monitor anaerobic microbial reactions

Ishii, Kosuke*; Miyasaka, Iku*; Fukunaga, Sakae*; Asano, Takahiro; Sasaki, Yoshito; Yoshikawa, Hideki

no journal, , 

no abstracts in English

Oral presentation

Bioactivity in deep groundwater by using hydrogen measurement

Fukunaga, Sakae*; Miyasaka, Iku*; Yoshikawa, Hideki

no journal, , 

We developed a method to measure microbial activity by using hydrogen consumption without organic-matter addition. It was applied to shallow and deep groundwaters at Horonobe, which contained little biodegradable-organic matter, and revealed microbial adaptation to an anaerobic environment. The result would contribute to answer a question whether consideration for microbes is needed in studying groundwater at a site. The research was carried out as a part of "Project for Assessment Methodology Development of Chemical Effects on Geological Disposal System" funded by the Ministry of Economy, Trade and Industry, Japan.

16 (Records 1-16 displayed on this page)
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