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JAEA Reports

Conceptual design of multipurpose compact research reactor; Annual report FY2010 (Joint research)

Imaizumi, Tomomi; Miyauchi, Masaru; Ito, Masayasu; Watahiki, Shunsuke; Nagata, Hiroshi; Hanakawa, Hiroki; Naka, Michihiro; Kawamata, Kazuo; Yamaura, Takayuki; Ide, Hiroshi; et al.

JAEA-Technology 2011-031, 123 Pages, 2012/01

JAEA-Technology-2011-031.pdf:16.08MB

The number of research reactors in the world is decreasing because of their aging. However, the planning to introduce the nuclear power plants is increasing in Asian countries. In these Asian countries, the key issue is the human resource development for operation and management of nuclear power plants after constructed them, and also the necessity of research reactor, which is used for lifetime extension of LWRs, progress of the science and technology, expansion of industry use, human resources training and so on, is increasing. From above backgrounds, the Neutron Irradiation and Testing Reactor Center began to discuss basic concept of a multipurpose low-power research reactor for education and training, etc. This design study is expected to contribute not only to design tool improvement and human resources development in the Neutron Irradiation and Testing Reactor Center but also to maintain and upgrade the technology on research reactors in nuclear power-related companies. This report treats the activities of the working group from July 2010 to June 2011 on the multipurpose low-power research reactor in the Neutron Irradiation and Testing Reactor Center and nuclear power-related companies.

JAEA Reports

The Sorption database of radionuclides for cementitious materials

Kato, Hiroshige*; Mine, Tatsuya*; Mihara, Morihiro; Oi, Takao; Honda, Akira

JNC TN8400 2001-029, 63 Pages, 2002/01

JNC-TN8400-2001-029.pdf:1.81MB

Cementitious materials will be used for the TRU waste repository as a component of engineered barrier system. The distribution coefficients which represent the retardation of radionuclides migration for the cementitious materials would be one of the important parameter for the safety assessment. The much information of radionuclide sorption onto the cementitious materials has been accumulated through the study in the world. Therefore it is necessary to compile the information and Kd of the radionuclides reported in previous studies. In this report, the Kd of the important radionuclides, such as C, Ni, Se, Sr, Zr, Nb, Mo, Tc, Sn, I, Cs, Sm, Pb, Ra, Ac, Th, Pa, U, Np, Pu, Am, Cm, for the cementitious materials were compiled as the Sorption Database (SDB). For radionuclides to be sensitive to the redox potential, e.g. Se, Tc, Pa, U, Pu and Np, some Kds measured under the controlled atmosphere had been reported, and few Kds measured under the controlled redox potential had been reported. For Se, Mo, Sm, Cm and Ac, the distribution coefficients had not been reported, therefore distribution coefficients of Se and Mo for OPC (Ordinary Portland Cement) pastes were measured by batch sorption experiments and these data were added into the SDB.

Journal Articles

Progress of the ITER central solenoid model coil programme

Tsuji, Hiroshi; Okuno, Kiyoshi*; Thome, R.*; Salpietro, E.*; Egorov, S. A.*; Martovetsky, N.*; Ricci, M.*; Zanino, R.*; Zahn, G.*; Martinez, A.*; et al.

Nuclear Fusion, 41(5), p.645 - 651, 2001/05

 Times Cited Count:55 Percentile:83.06(Physics, Fluids & Plasmas)

no abstracts in English

JAEA Reports

Experimental study of gas generation by microorganism

Mine, Tatsuya*; Mihara, Morihiro;

JNC TN8430 2000-010, 27 Pages, 2000/07

JNC-TN8430-2000-010.pdf:0.72MB

In the geological disposal system of the radioactive wastes, gas generation by microorganism could be significant for the assessment of this system, because organic material included in groundwater, buffer material and wastes might serve as carbon sources for microorganisms. In this study, gas generation tests using microorganisms were carried out under anaerobic condition. The amount of methane and carbon dioxide that were generated by activity of Methane Producing Bacteria (MPB) were measured with humic acid, acetic acid and cellulose as carbon sources. The results showed that methane was not generated from humic acid by activity of MPB. However, in the case of using acetic acid and cellulose, methane was generated, but at high pH condition (pH=10), the amount of generated methane was lower than at low pH (pH=7). It was not clear whether the pH would affect the amount of generated carbon dioxide.

JAEA Reports

Experimental investigation of activities and tolerance of denitrifying bacteria under alkaline and reducing condition

Mine, Tatsuya*; Mihara, Morihiro;

JNC TN8430 2000-009, 35 Pages, 2000/07

JNC-TN8430-2000-009.pdf:0.88MB

In the geological disposal system of TRU wastes, nitrogen generation by denitrifying bacteria could provide significant impact on the assessment of this system, because nitrate contained in process concentrated liquid waste might be electron acceptor for denitrifying bacteria. In this study, the activities and tolerance of denitrifying bacteria under disposal condition were investigated. pseudomonas denitrificans as denitrifying bacteria was used. The results showed that Pseudomonas denitrificans had activity under reducing condition, but under high pH condition (PH$$>$$9.5), the activity of Pseudomonas denitrificans was not detected. It is possible that the activity of Pseudomonas denitrificans would be low under disposal condition.

JAEA Reports

Experimental studies of biodegradation of asphalt by microorganisms

Mine, Tatsuya*; Mihara, Morihiro; ; *; *

JNC TN8430 2000-003, 33 Pages, 2000/04

JNC-TN8430-2000-003.pdf:1.3MB

On the geological disposal system of the radioactive wastes, the activities of the microorganisms that could degrade the asphalt might be significant for the assessment of the system performance. As the main effects of the biodegradation of the asphalt, the fluctuation of leaching behavior of the nuclides included in asphalt waste has been indicated. In this study, the asphalt biodegradation test was carried out. The microorganism of which asphalt degradation ability was comparatively higher under aerobic condition and anaerobic condition was used. The asphalt biodegradation rate was calculated and it was evaluated whether the asphalt biodegradation in this system could occur. The results show that the asphalt biodegradation rate under anaerobic and high alkali condition will be 300 times lower than under aerobic and neutral pH.

Journal Articles

None

; Mine, Tatsuya*;

Saikuru Kiko Giho, (6), p.53 - 59, 2000/03

None

JAEA Reports

Experimental study of microbial transport on bentonite sand mixture

Mine, Tatsuya; Mihara, Morihiro; Oi, Takao

JNC TN8430 99-013, 31 Pages, 1999/11

JNC-TN8430-99-013.pdf:1.83MB

On the geological disposal system of the radioactive wastes, the activities of the microorganisms that could penetrate through the buffer material might be significant for the assessment of this system. In this system, it is expected that the bentonite sand mixture, which is a candidate material of the buffer material, has a function to prevent the penetration of the microorganism into the buffer material. The microbial activity that arises in the buffer material inside seems to affect transport behavior of nuclides. But the effect of the microbial activity may not be significant in the case that the number of the microorganism that exists in the buffer material inside is limited and that the microorganism can not penetrate through the buffer material. In this study, it was confirmed whether the microorganisms would penetrate through the bentonite sand mixture. The results show that the microbial transport would not occur easily under the condition which is more than 1200kg/m$$^{3}$$ of dry density and less than 50wt% of silica sand contents of the bentonite sand mixture.

JAEA Reports

Distribution coefficients of radio-elements on compacted bentonite under cementitious conditions

Mine, Tatsuya*; Mihara, Morihiro; Kato, Hiroshige*

JNC TN8430 99-012, 166 Pages, 1999/11

JNC-TN8430-99-012.pdf:4.31MB

It is important to obtain the distribution coefficients of radio-elements on the bentonite under cementitious conditions in the geological disposal system of radioactive wastes. In-Diffusion experiments of Cs, Sr, Zr, Nb, Ni, Sn, Am, U, Np in Na-bentonite, Ca-bentonite, bentonite analcite mixture were carried out and the distribution coefficients were calculated. The experimental parameters were dry density (1200kg/m$$^{3}$$, 1600kg/m$$^{3}$$, 1800kg/m$^${3}$) and synthetic solution type (distilled water, cementitous solution, cementitious solution+sea water, cementitous solution+sea water+nitrate). It was shown that the effects of the experimental parameters on the distribution coefficients on the most part of radio-elements used in this study were relatively small.

JAEA Reports

None

Mine, Tatsuya*; Mihara, Morihiro; Ito, Masaru; Kato, Hiroshige*

PNC TN8410 97-258, 57 Pages, 1997/06

PNC-TN8410-97-258.pdf:2.81MB

None

Journal Articles

None

; Yoshikawa, Hideki; Mine, Tatsuya*

Gogai Kaiyo, (9911), , 

None

Oral presentation

Zinc kinetics in HCV Replicon

Takizawa, Daichi*; Takagi, Hitoshi*; Makita, Chikako*; Nakajima, Yuka*; Saito, Etsuko*; Oyama, Tatsuya*; Ichikawa, Takeshi*; Kakizaki, Akira*; Sato, Ken*; Mori, Masatomo*; et al.

no journal, , 

no abstracts in English

Oral presentation

Development of efficient dissolution technology for FBR MOX fuel, 9; Endurance test of the bearing for rotary dram type continuous dissolver

Katsurai, Kiyomichi; Washiya, Tadahiro; Onishi, Hiroyuki*; Kuroda, Kazuhiko*; Nishikawa, Hideaki*; Nakatani, Tatsuya*; Yamashita, Kazuhiko*; Yoshimine, Chihiro*

no journal, , 

This report presents the knowledge acquired by the endurance test of the bearing used for the rotary drum type continuation dissolver under development as part of Fast Breeder Reactor Cycle technology Development Project (FaCT project). The bearing used for a dissolver is used on high radiation environment and the severe conditions of high load low swing motion operation. In order to check the endurance of the bearing in such conditions, the endurance test of the small scale of hybrid roll bearing using the lubricant which imitated carbon slide bearing as a-less lubricous type, and imitated radiation and heat degradation as a lubricous type was carried out, and the applicability to dissolver bearing was evaluated.

13 (Records 1-13 displayed on this page)
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