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Journal Articles

Extraction of trivalent rare earths and minor actinides from nitric acid with ${it N,N,N',N'}$-tetradodecyldiglycolamide (TDdDGA) by using mixer-settler extractors in a hot cell

Ban, Yasutoshi; Suzuki, Hideya; Hotoku, Shinobu; Kawasaki, Tomohiro*; Sagawa, Hiroshi*; Tsutsui, Nao; Matsumura, Tatsuro

Solvent Extraction and Ion Exchange, 37(1), p.27 - 37, 2019/00

 Times Cited Count:14 Percentile:70.66(Chemistry, Multidisciplinary)

A continuous counter-current experiment using TDdDGA was performed using mixer-settler extractors installed in a hot cell. Nitric acid containing minor actinides (MAs: Am and Cm), rare earths (REs: Y, La, Nd, and Eu), and other fission products (Sr, Cs, Zr, Mo, Ru, Rh, and Pd) was fed to the extractor. TDdDGA effectively extracted MAs and REs from the feed, while other fission products were barely extracted. The extracted MAs and REs were back-extracted by bringing them in contact with 0.02 mol/dm$$^{3}$$ nitric acid, and they were collected as the MA-RE fraction. The proportions of MA and RE in the MA-RE fraction were $$>$$ 98% and $$>$$ 86%, respectively. These results demonstrated the applicability of TDdDGA as an extractant for MAs and REs.

Journal Articles

Local magnetic states of the weakly ferromagnetic iron-based superconductor Sr$$_{2}$$VFeAsO$$_{3-delta}$$ studied by X-ray magnetic circular dichroism

Horio, Masafumi*; Takeda, Yukiharu; Namiki, Hiromasa*; Katagiri, Takao*; Wakabayashi, Yuki*; Sakamoto, Shoya*; Nonaka, Yosuke*; Shibata, Goro*; Ikeda, Keisuke*; Saito, Yuji; et al.

Journal of the Physical Society of Japan, 87(10), p.105001_1 - 105001_2, 2018/10

 Times Cited Count:1 Percentile:16.87(Physics, Multidisciplinary)

Journal Articles

Continuous extraction and separation of Am(III) and Cm(III) using a highly practical diamide amine extractant

Suzuki, Hideya; Tsubata, Yasuhiro; Kurosawa, Tatsuya*; Sagawa, Hiroshi*; Matsumura, Tatsuro

Journal of Nuclear Science and Technology, 54(11), p.1163 - 1167, 2017/11

 Times Cited Count:18 Percentile:93.53(Nuclear Science & Technology)

A highly practical diamide-type extractant, which is an alkyl diamide amine with 2-ethylhexyl alkyl chains (ADAAM(EH)), was investigated for mutual separation of Am(III) and Cm(III). ADAAM(EH) is a multidentate ligand with one soft N-donor atom and two hard O-donor atoms in its central frame. This tridentate arrangement of donor atoms provides selective binding to Am(III) compared to that with Cm(III) in highly acidic media, resulting in separation factors of up to 5.5. A continuous liquid-liquid extraction and stripping test was conducted using a multistage countercurrent mixer-settler extractor with ADAAM(EH) in n-dodecane. In this test, separation of Am(III) and Cm(III) was achieved with very high yield.

Journal Articles

Solvent extraction of uranium with ${it N}$,${it N}$-di(2-ethylhexyl)octanamide from nitric acid medium

Tsutsui, Nao; Ban, Yasutoshi; Sagawa, Hiroshi; Ishii, Sho; Matsumura, Tatsuro

Solvent Extraction and Ion Exchange, 35(6), p.439 - 449, 2017/08

 Times Cited Count:3 Percentile:17.92(Chemistry, Multidisciplinary)

Solvent extraction of uranium from a nitric acid medium was performed with ${it N}$,${it N}$-di(2-ethylhexyl)octanamide (DEHOA) by a single-stage batch method, and the distribution ratio equation of U(VI) was derived as $${it D}_{rm U}$$ = 1.1$$[rm NO^{-}_{3}]^{1.6}_{rm aq}[{rm DEHOA}]^{2}_{rm org}$$. Furthermore, the nitric acid distribution was also evaluated, and the distribution ratio equation $${it D}_{rm H}$$ = 0.12$$[rm H^{+}]^{0.76}_{rm aq}[{rm DEHOA_{rm Free}}]_{rm H}$$ was obtained. Batch experiments to evaluate the time dependence of U(VI) extraction and the U(VI) loading capacity of DEHOA were also performed. It was revealed that U(VI) extraction by DEHOA reached an equilibrium state within a few minutes, and the loading capacity was 0.71 mol/dm$$^{3}$$ (M) when the concentrations of DEHOA and nitric acid were 1.5 and 3.0 M, respectively.

Journal Articles

Evaluation of severe external events on JSFR

Hayafune, Hiroki; Kato, Atsushi; Chikazawa, Yoshitaka; Okubo, Tsutomu; Sagawa, Hiroshi*; Shimakawa, Yoshio*

Proceedings of International Conference on Fast Reactors and Related Fuel Cycles; Safe Technologies and Sustainable Scenarios (FR-13) (USB Flash Drive), 11 Pages, 2013/03

Evaluation of earthquake and tsunami on JSFR has been analyzed. For seismic design, safety components are confirmed to maintain their functions even against recent strong earthquakes. As for Tsunami, some parts of reactor building might be submerged including component cooling water system whose final heat sink is sea water. However, in the JSFR design, safety grade components are independent from component cooling water system (CCWS). The JSFR emergency power supply adopts a gas turbine system with air cooling, since JSFR does not basically require quick start-up of the emergency power supply thanks to the natural convection DHRS. Even in case of long station blackout, the DHRS could be activated by emergency batteries or manually and be operated continuously by natural convection.

Journal Articles

Journal Articles

Evaluation of Earthquake and Tsunami on JSFR

Chikazawa, Yoshitaka; Enuma, Yasuhiro; Kisohara, Naoyuki; Yamano, Hidemasa; Kubo, Shigenobu; Hayafune, Hiroki; Sagawa, Hiroshi*; Okamura, Shigeki*; Shimakawa, Yoshio*

Proceedings of 2012 International Congress on Advances in Nuclear Power Plants (ICAPP '12) (CD-ROM), p.677 - 686, 2012/06

Evaluation of Earthquake and Tsunami on JSFR has been analyzed. For seismic design, safety components are confirmed to maintain their functions even against recent strong Earthquakes. As for Tsunami, some parts of reactor building might be submerged including component cooling water system whose final heat sink is sea water. However, in the JSFR design, safety grade components are independent from component cooling water system (CCWS). The JSFR emergency power supply adopts a gas turbine system with air cooling, since JSFR does not basically require quick start-up of the emergency power supply thanks to the natural convection DHRS. Even in case of long station blackout, the DHRS could be activated by emergency batteries or manually and be operated continuously by natural convection.

JAEA Reports

Safety demonstration test using the High Temperature Engineering Test Reactor (HTTR); Cold test of the loss of forced cooling

Shinohara, Masanori; Yanagi, Shunki; Tochio, Daisuke; Shimazaki, Yosuke; Nojiri, Naoki; Owada, Hiroyuki; Sato, Nao; Sagawa, Hiroshi; Umeda, Masayuki

JAEA-Technology 2011-029, 39 Pages, 2011/12

JAEA-Technology-2011-029.pdf:3.03MB

JAEA plans and performs the safety demonstration test using the HTTR to develop High Temperature Gas Reactor technologies. Cold test of the loss of forced cooling was conducted prior to the safety demonstration test, to check test procedure and plant behavior. Cold test consists of two phases, Phase1, 1 or 2 Vessel Cooling System (VCS) terminates, in the Phase2, all 3 Gas circulators and 1 VCS terminates. Cold test could confirm test process, and obtain data necessary to analysis and 2-dimensional horizontal sectional model analysis was verified to simulate actual measurement value.

JAEA Reports

Low temperature tritium release experiment from lithium titanete breeder material

Tsuchiya, Kunihiko; Kawamura, Hiroshi; Nakamichi, Masaru*; Sagawa, Hisashi

JAERI-Tech 2005-013, 56 Pages, 2005/03

JAERI-Tech-2005-013.pdf:6.4MB

no abstracts in English

Journal Articles

Development of Nondestructive Measurement Techniques for Uranium-contaminated Waste in Containers

Oki, Koichi; Aoyama, Yasuhiro; Sukegawa, Yasuhiro*; Suzuki, Satoshi*; Sagawa, Hiroshi*; Hideo, Doi,*; Endo, Yasumi*

Waste Management 2005 Proceeding, CD-ROM, 8p., 8 Pages, 2005/03

We developed as a new technique to remove the influence of distance between radionuclides and detectors. We named the technique "the Facing Couple Method (FCM)". Partcality inspection which uses uranium source was parformed.Furthermore, the application possibility to a system was confirmed.

JAEA Reports

Study on Advanced Systematic Function of the JNC Geological Disposal Technical Information Integration System -Summary Report-

Ishihara, Yoshinao*; Fukui, Hiroshi*; Sagawa, Hiroshi*; Matsunaga, Kenichi*; Ito, Takaya*

JNC TJ8400 2004-003, 28 Pages, 2004/02

JNC-TJ8400-2004-003.pdf:0.51MB

In this study, while attaining systematization about the technical know-how mutually utilized between geology environmental field, disposal technology (design) field and safety assessment field, the share function of general information in which the formation of an information share and the use promotion between the technical information management databases built for every field were aimed at as an advancement of the function of JNC Geological Disposal Technical Information Integration System considered, and the system function for realizing considered in integration of technical information. (1) Since the concrete information about geology environment which is gradually updated with progress of stratum disposal research, or increases is reflected suitable for research of design and safety assessment, After arranging the form suitable for systematizing technical information, while arranging the technical information in both the fields of design and safety assessment with the form of two classes based on tasks/works, it systematized planning adjustment about delivery of technical information with geology environmental field. (2) In order to aim at integration of 3-fields technical information of geological disposal, based on the examination result of systematization of technical information, the function of mutual use of the information managed in two or more databases was considered. Moreover, while considering system functions, such as management of the use history of technical information, connection of information use, and a notice of common information, the system operation windows in consideration of the ease of operation was examined.

JAEA Reports

Study on Advanced Systematic Function of the JNC Geological Disposal Technical Information Integration System -Research Document-

Ishihara, Yoshinao*; Fukui, Hiroshi*; Sagawa, Hiroshi*; Matsunaga, Kenichi*; Ito, Takaya*

JNC TJ8400 2004-002, 99 Pages, 2004/02

JNC-TJ8400-2004-002.pdf:10.91MB

In this study, while attaining systematization about the technical know-how mutually utilized between geology environmental field, disposal technology (design) field and safety assessment field, the share function of general information in which the formation of an information share and the use promotion between the technical information management databases built for every field were aimed at as an advancement of the function of JNC Geological Disposal Technical Information Integration System considered, and the system function for realizing considered in integration of technical information. (1) Since the concrete information about geology environment which is gradually updated with progress of stratum disposal research, or increases is reflected suitable for research of design and safety assessment, After arranging the form suitable for systematizing technical information, while arranging the technical information in both the fields of design and safety assessment with the form of two classes based on tasks/works, it systematized planning adjustment about delivery of technical information with geology environmental field. (2) In order to aim at integration of 3-fields technical information of geological disposal, based on the examination result of systematization of technical information, the function of mutual use of the information managed in two or more databases was considered. Moreover, while considering system functions, such as management of the use history of technical information, connection of information use, and a notice of common information, the system operation windows in consideration of the ease of operation was examined.

Journal Articles

Development of Technique for Measuring Uranium Quantity within Containers Using the Passive Gamma Method

Oki, Koichi; Aoyama, Yasuhiro; Sukegawa, Yasuhiro*; Suzuki, Satoshi*; Sagawa, Hiroshi*; Hideo, Doi,*; Endo, Yasumi*

Saikuru Kiko Giho, (25), p.57 - 68, 2004/00

The system which measures and evaluates the quantity of uranium in the uranium contaminated waste in a large-sized container by NDA technology was manufactured.Practicality inspection which uses an uranium source was performed. Furthermore, the application possibility to a system was confirmed.

JAEA Reports

Study on Systematic Integration Technology of design and Safety Assessment for HLW geological Disposal(II)

Ishihara, Yoshinao*; Fukui, Hiroshi*; Sagawa, Hiroshi*; Ito, Takaya*; Matsunaga, Kenichi*; Kohanawa, Osamu*; Kuwayama, Yuki*

JNC TJ8400 2003-038, 41 Pages, 2003/02

JNC-TJ8400-2003-038.pdf:0.48MB

The present study was carried out relating to basic design of the "Geological Disposal Technology Integration System" that will be systematized as knowledge base for design analysis and safety assesment of HLW geological disposal system by integrating organically and hierarchically various technical information in three study field.

JAEA Reports

Study on Systematic Integration Technology of Design and Safety Assessment for HLW Geological Disposal (II)

Ishihara, Yoshinao*; Fukui, Hiroshi*; Sagawa, Hiroshi*; Ito, Takaya*; Matsunaga, Kenichi*; Kohanawa, Osamu*; Kuwayama, Yuki*

JNC TJ8400 2003-037, 505 Pages, 2003/02

JNC-TJ8400-2003-037.pdf:34.06MB

The present study was carried out relating to basic design of the "Geological Disposal Technology Integration System" that will be systematized as knowledge base for design analysis and safety assessment of HLW geological disposal system by integrating organically and hierarchically various technical information in three study field.

JAEA Reports

Study on systematic integration technology of design and safety assessment for HLW geological disposal

Ishihara, Yoshinao*; Fukui, Hiroshi*; Sagawa, Hiroshi*; Ito, Takaya*

JNC TJ8400 2002-043, 26 Pages, 2002/03

JNC-TJ8400-2002-043.pdf:1.83MB

The present study was carried out relating to basic design of the "Geological Disposal Technology Integration System" that will be systematized as knowledge base for analysis and assessment of geological disposal by integrating organically and hierarchically analysis and evaluation method in three study field. The key conclusions are summarized as follows: (1)The examination to construct the virtual geological disposal system which contained the geological environment on the computer was executed aiming at the development of integration and the analysis systems which became working common basic to execute the design and the performance assessment of the geological disposal system. (2)Technological information (I/O information) which became the base was associated with work (evaluation) item of "Disposal technology (design)" and "Performance assessment" in the Second Progress Report by JNC, and the evaluation flow by which a series of work concerning the design and the safety assessment of the geological disposal system was brought together was made. (3)The subject concerning the detailed model development in the R&D activity of the geological disposal system in the future was extracted aiming at the systematization of the performance and safety assessment, and was arranged as information to take these detailed models into the "Geological Disposal Technology Integration System".

JAEA Reports

Study on systematic integration technology of design and safety assessment for HLW geological disposal

Ishihara, Yoshinao*; Fukui, Hiroshi*; Sagawa, Hiroshi*; Ito, Takaya*; Matsunaga, Kenichi*; Kohanawa, Osamu*; Kuwayama, Yuki*

JNC TJ8400 2002-042, 247 Pages, 2002/03

JNC-TJ8400-2002-042.pdf:7.48MB

The present study was carried out relating to basic design of the "Geological Disposal Technology Integration System" that will be systematized as knowledge base for analysis and assessment of geological disposal by integrating organically and hierarchically analysis and evaluation method in three study field. The key conclusions are summarized as follows: (1)The examination to construct the virtual geological disposal system which contained the geological environment on the computer was executed aiming at the development of integration and the analysis systems which became working common basic to execute the design and the performance assessment of the geological disposal system. (2) Technological information (I/O information) which became the base was associated with work (evaluation) item of "Disposal technology (design)" and "Performance assessment" in the Second Progress Report by JNC, and the evaluation flow by which a series of work concerning the design and the safety assessment of the geological disposal system was brought together was made. (3) The subject concerning the detailed model development in the R&D activity of the geological disposal system in the future was extracted aiming at the systematization of the performance and safety assessment, and was arranged as information to take these detailed models into the "Geological Disposal Technology Integration System".

JAEA Reports

Investigation research on the evaluation of a coupled thermo-hydro-mechanical-chemical phenomena; outline report

Chijimatsu, Masakazu*; Neyama, Atsushi*; Ishihara, Yoshinao*; Amemiya, Kiyoshi*; *; Iwata, Hiroshi*; Sagawa, Hiroshi*

JNC TJ8400 2002-004, 83 Pages, 2002/02

JNC-TJ8400-2002-004.pdf:0.91MB

In order to realize a coupling analysis in the near field of the geological disposal system, this study has been studied on the addition of the mass transport model to the coupled thermo-hydro-mechanical analysis code (THAMES) and preliminary coupling analysis by using development environmental tool (Diffpack) for numerical analysis. (1) In order to prepare the strategy on the addition of the mass transport model to the coupled thermo-hydro-mechanical analysis code (THAMES), we have studied on the requirement of THAMES-Transport and methodology of coupling analysis. After that we set out modification plan by the Eulerian-Lagrangian (EL) method. (2) Based on the document of modification plan, we have done addition of the mass transport model to the coupled thermo-hydro-mechanical analysis code (THAMES) and carried out verification analysis in order to confirm on the accuracy of THAMES-Transport. (3) In order to understand on the behavior of NaCl in the porewater under the coupled thermo-hydro-mechanical phenomena in the HLW engineered barrier system, we have calculated coupling phenomenon by using THAMES-Transport. Transportation and concentration phenomena of NaCl are calculated but precipitation of NaCl is not occurred under the analysis conditions in this report. (4) In order to confirm about feasibility of coupling analysis under the development environmental tool (Diffpack) for numerical analysis, we have carried out on the design work and writing program of the preliminary coupling system. In this study, we have adopted existing transport model (HYDROGEOCHEM) and geochemical model (phreeqe60) for preliminary coupling system. (5) In order to confirm program correctness of preliminary coupling system, we have carried out benchmarking analysis by using existing reactive-transport analysiscode (HYDROGEOCHEM). (6)We have been prepared short-range development plan based on through the modification study of THAMES and writing program of the preliminary coupling ...

JAEA Reports

Study on development of a geological disposal technology integration system

Ishihara, Yoshinao*; Matsuoka, Fushiki*; Sagawa, Hiroshi*; Kawahara, Kenichi*; Kataoka, Shinichi*; Shinohara, Yoshinori*; Muroi, Masayuki*; Tsuchiya, Makoto*; Tsujimoto, Keiichi*; Ohashi, Toyo*

JNC TJ8400 2001-011, 259 Pages, 2001/03

JNC-TJ8400-2001-011.pdf:0.99MB

In this study, the basic design study on integrated computer system has been carried out in order to develop the integrated methodologies for future research and development activities of geological disposal system. The key conclusions are summarized as follows: (1) As the result of the investigation of work items and associated flow of information (data) between items in the second progress report by JNC, the interaction matrix and work flow chart have been identified in order to specify the basic configuration of the integrated computer system. In addition, the model chain and the structure of data relation between the repository design study and safety assessment study have been summarized. (2)We organized and examined the system factor and the information process flow in the design, safety analysis, and geological environment study based on the 2000 Report by JNC. Then we analyzed the workflow of geological disposal business when a specific site for a repository is fixed to obtain the system factor and the information process flow. We consider the fracture/porous media, site location (land/under the sea), and long-term stability of the crust (upheaval/sink) as the key factors in examining the workflow of geological disposal business. Then we organized the information change between the design and other study in geological disposal based on the 2000 Report by JNC. We examined the ideal workflow in which the design, safety analysis, and geologic environment study of geological disposal are closely coupled. We examined the scientific and technical base of the knowledge base (the system factor and the information process flow) which is derived from the above to construct the hierarchical structure of the knowledge base for geological disposal. (3)As the result of the interaction matrix and work flow chart for the R&D activities, the conceptual design and the function diagram on the integrated computer system has been proposed. (4)We examined the plan to ...

Journal Articles

Irradiation effects on magnetic probes made of mineral insulated cable

Nishitani, Takeo; Shikama, Tatsuo*; Fukao, M.*; Matsuo, H.*; Snider, R.*; Broesch, J.*; Sagawa, Hisashi; Kawamura, Hiroshi; Kasai, Satoshi

Fusion Engineering and Design, 51-52(Part.B), p.153 - 158, 2000/11

 Times Cited Count:9 Percentile:55.69(Nuclear Science & Technology)

no abstracts in English

43 (Records 1-20 displayed on this page)