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Journal Articles

Effect of change of aging heat treatment pattern on the JK2LB jacket for the ITER central solenoid

Ozeki, Hidemasa; Saito, Toru; Kawano, Katsumi; Takahashi, Yoshikazu; Nunoya, Yoshihiko; Yamazaki, Toru; Isono, Takaaki

Physics Procedia, 67, p.1010 - 1015, 2015/07

 Times Cited Count:0 Percentile:100

Journal Articles

Establishment of production process of JK2LB jacket section for ITER CS

Ozeki, Hidemasa; Hamada, Kazuya; Takahashi, Yoshikazu; Nunoya, Yoshihiko; Kawano, Katsumi; Oshikiri, Masayuki; Saito, Toru; Teshima, Osamu*; Matsunami, Masahiro*

IEEE Transactions on Applied Superconductivity, 24(3), p.4800604_1 - 4800604_4, 2014/06

 Times Cited Count:13 Percentile:35.3(Engineering, Electrical & Electronic)

Journal Articles

Irradiation effect of swift heavy ion for Zr$$_{50}$$Cu$$_{40}$$Al$$_{10}$$ bulk glassy alloy

Onodera, Naoto*; Ishii, Akito*; Ishii, Koji*; Iwase, Akihiro*; Yokoyama, Yoshihiko*; Saito, Yuichi; Ishikawa, Norito; Yabuuchi, Atsushi*; Hori, Fuminobu*

Nuclear Instruments and Methods in Physics Research B, 314, p.122 - 124, 2013/11

 Times Cited Count:2 Percentile:77.53(Instruments & Instrumentation)

It has been reported that heavy ion irradiation causes softening in some cases of Zr-based bulk metallic glass alloys. However, the fundamental mechanisms of such softening have not been clarified yet. In this study, Zr$$_{50}$$Cu$$_{40}$$Al$$_{10}$$ bulk glassy alloys were irradiated with heavy ions of 10 MeV I at room temperature. Positron annihilation measurements have performed before and after irradiation to investigate changes in free volume. We discuss the relationship between the energy loss and local open volume change after 10 MeV I irradiation compared with those obtained for 200 MeV Xe and 5 MeV Al. The energy loss analysis in ion irradiation for the positron lifetime has revealed that the decreasing trend of positron lifetime is well expressed as a function of total electronic energy deposition rather than total elastic energy deposition. It means that the positron lifetime change by the irradiation has a relationship with the inelastic collisions with electrons during heavy ion irradiation.

Journal Articles

Preparation for the ITER central solenoid conductor manufacturing

Hamada, Kazuya; Nunoya, Yoshihiko; Isono, Takaaki; Takahashi, Yoshikazu; Kawano, Katsumi; Saito, Toru; Oshikiri, Masayuki; Uno, Yasuhiro; Koizumi, Norikiyo; Nakajima, Hideo; et al.

IEEE Transactions on Applied Superconductivity, 22(3), p.4203404_1 - 4203404_4, 2012/06

 Times Cited Count:14 Percentile:35.56(Engineering, Electrical & Electronic)

Japan Atomic Energy Agency (JAEA) has the responsibility for procurement of all of the ITER central solenoid (CS) conductor lengths. The CS conductor is composed of 576 Nb$$_{3}$$ Sn superconducting strands and 288 Cu strands assembled together into a multistage cable and protected by a circle-in-square sheath tube (jacket) with the outer dimension of 49 mm. In preparation for CS conductor production, the following R&D activities have been performed; (1) Mechanical tests at 4 K have been performed for jacket candidate materials such as 316LN and JK2LB, (2) Welding test for filler selection, (3) Measurement of coefficient of sliding friction using a 100-m long dummy cable, (4) Deformation characteristics of the conductor cross section after compaction and spooling. As a result of these R&D, the CS conductor jacket manufacturing technologies have been confirmed to start the procurement of the CS conductor.

JAEA Reports

Development of the sorption and diffusion database system for safety assessment of geological disposal

Tachi, Yukio; Tochigi, Yoshikatsu; Suyama, Tadahiro; Saito, Yoshihiko; Ochs, M.*; Yui, Mikazu

JAEA-Data/Code 2008-034, 36 Pages, 2009/02

JAEA-Data-Code-2008-034.pdf:5.72MB

Japan Atomic Energy Agency (JAEA) has been developing databases of sorption and diffusion parameters in buffer material and rock, which are key parameters for safety assessment of the geological disposal. The new web-based sorption and diffusion database system (JAEA-SDB/DDB) has been developed to utilize quality assuring procedure and to allow effective application for parameter setting, based on the existing database. In the present report, practical examples were illustrated regarding the applicability of the database system to the parameter setting by using additional functions such as QA information and parameter estimation. This database system is expected to make it possible to obtain quick overview of the available data from the database, and to have suitable access to the respective data for parameter-setting for performance assessment and parameter-deriving for mechanistic modeling in traceable and transparence manner.

JAEA Reports

Evaluating and categorizing the reliability of distribution coefficient values in the sorption database, 2

Saito, Yoshihiko; Ochs, M.*; Kunze, S.*; Kitamura, Akira; Tachi, Yukio; Yui, Mikazu

JAEA-Technology 2008-018, 116 Pages, 2008/03

JAEA-Technology-2008-018.pdf:1.08MB

In this report, the QA/classification of selected entries (1,056 Kd values) in the JNC-SDB, especially of Kd values for mudstone system to use in the Kd-derivation exercise for Horonobe rocks, was done following the approach defined in our previous report. This classification scheme made it possible to obtain quick overview of the available data, and to have suitable access to the respective Kd values.

JAEA Reports

Application of the sorption database to K$$_{d}$$-setting for Horonobe rocks

Ochs, M.*; Kunze, S.*; Saito, Yoshihiko; Kitamura, Akira; Tachi, Yukio; Yui, Mikazu

JAEA-Research 2008-017, 89 Pages, 2008/03

JAEA-Research-2008-017.pdf:3.23MB

In the present report, a first test and illustration was performed regarding the applicability of the JNC-SDB to the derivation of K$$_{d}$$-values for Th, Np, Cs, and Se valid for Horonobe rocks. The original experimental data selected from the JNC-SDB were converted to the application conditions using the semi-quantitative scaling procedures. To illustrate the effect of the scaling procedures, and of related uncertainties, on the magnitude of the derived K$$_{d}$$-values, scaling procedures taking into account mineralogy as well as surface and solution speciation were applied sequentially, and all results were discussed in detail. This K$$_{d}$$-setting exercise allowed to predict the magnitude of K$$_{d}$$ values under the in-situ conditions, however the availability of experimental data that closely match the application conditions is limited for some reasons.

JAEA Reports

An Update of the sorption database; Correction and addition of published literature data

Saito, Yoshihiko; Ochs, M.*; Suyama, Tadahiro*; Kitamura, Akira; Shibata, Masahiro; Sasamoto, Hiroshi

JAEA-Data/Code 2007-014, 24 Pages, 2007/07

JAEA-Data-Code-2007-014.pdf:2.41MB

Japan Nuclear Cycle Development Institute (JNC) has developed the sorption database (JNC-SDB) for bentonite and rocks in order to estimating a retardation capacity of important radioactive elements on natural barrier and engineered barrier in the H12 report. The database includes distribution coefficient (K$$_{rm d}$$) of important radionuclides. And JNC collected the sorption data from 1998 to 2003. In this report, Japan Atomic Energy Agency (JAEA) widely collected the sorption data in order to extend and update the sorption database. The updated database includes the published data which are not registered in the sorption database. In this updated JNC-SDB, 3,205 sorption data for 23 elements, which are important for performance assessment were included. The frequency of K$$_{rm d}$$ for some elements was clearly shown by addition of the sorption data.

JAEA Reports

Evaluating and categorizing the reliability of distribution coefficient values in the sorption database

Ochs, M.*; Saito, Yoshihiko; Kitamura, Akira; Shibata, Masahiro; Sasamoto, Hiroshi; Yui, Mikazu

JAEA-Technology 2007-011, 342 Pages, 2007/03

JAEA-Technology-2007-011.pdf:24.24MB

Japan Atomic Energy Agency (JAEA) has developed the sorption database (SDB) for bentonite and rocks in order to assess the retardation property of important radioactive elements in natural and engineered barriers in the H12 report. The database includes distribution coefficient (K$$_{d}$$) of important radionuclides. The K$$_{d}$$ values in the SDB are about 20,000 data. The SDB includes a great variety of K$$_{d}$$ and additional key information from many different literatures. Accordingly, the following classification guideline and classification system were developed in order to evaluate the reliability of each K$$_{d}$$ value (Th, Pa, U, Np, Pu, Am, Cm, Cs, Ra, Se, Tc on bentonite). The reliability of 3740 K$$_{d}$$ values are evaluated and categorized.

Journal Articles

Soft X-ray absorption magnetic circular dichroism study of ferromagnetic superconductor UGe$$_2$$

Okane, Tetsuo; Okamoto, Jun*; Mamiya, Kazutoshi*; Fujimori, Shinichi; Takeda, Yukiharu; Saito, Yuji; Muramatsu, Yasuji*; Fujimori, Atsushi*; Haga, Yoshinori; Yamamoto, Etsuji; et al.

Journal of the Physical Society of Japan, 75(2), p.024704_1 - 024704_5, 2006/02

 Times Cited Count:9 Percentile:46.32(Physics, Multidisciplinary)

no abstracts in English

JAEA Reports

Development of Guideline for Evaluating and Categorizing the Reliability of Distribution Coefficient Values in the JNC-Sorption Database

Yoshihiko, Saito,; Ochs, M.*; Jintoku, Takashi*; Suyama, Tadahiro*; Shibata, Masahiro; Sasamoto, Hiroshi; Yui, Mikazu

JNC-TN8410 2005-011, 59 Pages, 2005/08

JNC-TN8410-2005-011.pdf:2.04MB

Japan Nuclear Cycle Development Institute (JNC) has developed the JNC-Sorption Database (JNC-SDB) for bentonite and rocks in order to assess the retardation property of important radioactive elements in natural and engineered barriers in the H12 report. The database includes distribution coefficient (Kd) of important radionuclides. The Kd values in the JNC-SDB are about 20,000 data. And the JNC-SDB includes a great variety of Kd and additional key information from many different experimental conditions. Accordingly, the following classification guideline and classification system were developed in order to evaluate the reliability of each Kd value. (1) Criterion I: Completeness of documentation and type of Kd information (2) Criterion II: Quality of reported data from a technical and scientific point of view (3) Criterion III: Consistency of data with the majority of related reliable studies (4) An overall classification system / The checkpoints in Criterion II evaluate the reliability of each Kd entry in the JNC-SDB ; solid phase, adjustment and control of pH, redox conditions, final solution composition, temperature, solid/water ratio and grain size, sorption value, initial radionuclide concentration, phase separation, reaction time, agitation method, radionuclide loading, reaction vessels, uncertainty estimates, parameter variation

JAEA Reports

Measurements of Distribution Coefficient for Sm on Tuff and Granodiorite in Synthesized Sea Water and Distilled Water

Morooka, Koichi*; Nakazawa, Toshiyuki*; Yoshihiko, Saito,; Suyama, Tadahiro*; Shibata, Masahiro; Sasamoto, Hiroshi

JNC-TN8400 2005-015, 63 Pages, 2005/08

JNC-TN8400-2005-015.pdf:1.29MB

Japan Nuclear Cycle Development Institute (JNC) has developed a sorption database for bentonite and rocks in order to assess the retardation property of important radioactive elements in natural and engineered barriers in the H12 report. However, there are not enough distribution coefficient data for some radioactive elements in the database. Thus the batch sorption tests for tuff and granodiorite were performed for Samarium (Sm) in synthesized sea water and distilled water under reducing conditions. For Samarium, there are little registration numbers of JNC database and it is important element for performance assessment of HLW disposal system. The results of the experiments are summarized below;(1)Kd for tuff were approximately 0.6 m$$^{3}$$/kg in rock - distilled water leachate (Eh=-320 - -270mV) adjusted to pH 7 after 10000 MWCO filtration.(2)Kd for tuff were approximately 0.4 m$$^{3}$$/kg in rock - synthesized sea water leachate (Eh=-304 - -265mV) adjusted to pH 7 after 10000 MWCO filtration.(3)Kd for granodiorite at 1 week were approximately 3.9 m$$^{3}$$/kg in rock - distilled water leachate (Eh=-279 - -242mV) adjusted to pH 9 after 10000 MWCO filtration. Kd had a tendency to rise with time in the period of 1 week through 4 week.(4)Kd for granodiorite at 1 week were approximately 0.3 m$$^{3}$$/kg in rock - synthesized sea water leachate (Eh=-237 - -206mV) adjusted to pH 9 after 10000 MWCO filtration. Kd had a tendency to rise with time in the period of 1 week through 4 week.

JAEA Reports

Measurements of Distribution Coefficient for U and Th on Sand Stone in Synthesized Sea Water and Distilled Water

Nakazawa, Toshiyuki*; Okada, Kenichi*; Yoshihiko, Saito,; Suyama, Tadahiro*; Shibata, Masahiro; Sasamoto, Hiroshi

JNC-TN8400 2004-023, 67 Pages, 2005/01

JNC-TN8400-2004-023.pdf:2.62MB

Japan Nuclear Cycle Development Institute (JNC) has developed the sorption database for dentonite and rocks in order to assess the retardation capacities of important radioactive elements in natural and engineered barriers in the H12 report. However, there are not enough distribution coefficient data for radioactive elements in saline type groundwater in the database. Thus the batch sorption tests were performed for uranium(U) and thorium(Th) in saline type groundwater. For these elements, there are little registration numbers in the JNC's sorption database, and also these elements are important to evaluate the safety of disposal system. The experiments for each radioactive element were performed on the following conditions; *U:Kd measurements using the solutions (synthesized sea water and distilled water) reacted with sand stone as a function of carbonate concentration, under reducing conditions. *Th:Kd measurements using the solutions (synthesized sea water and distilled water) reacted with sand stone.

Oral presentation

Sorption and diffusion database system development and its application

Tachi, Yukio; Saito, Yoshihiko; Tochigi, Yoshikatsu; Ochs, M.*; Kitamura, Akira; Yui, Mikazu

no journal, , 

The sorption and diffusion database has been developed for the safety assessment of geological disposal system. This report has focused on evaluating of quality level and testing the usefulness of the database for possible applications to Kd setting.

Oral presentation

Preparation for ITER CS conductor fabrication

Hamada, Kazuya; Nunoya, Yoshihiko; Takahashi, Yoshikazu; Isono, Takaaki; Nabara, Yoshihiro; Hemmi, Tsutomu; Matsui, Kunihiro; Kawano, Katsumi; Ebisawa, Noboru; Oshikiri, Masayuki; et al.

no journal, , 

The ITER Central Solenoid (CS) conductor is composed of 576 Nb$$_{3}$$Sn superconducting strands and 288 Cu strands assembled together into a multistage cable and protected by a circle-in-square jacket with the outer dimension of 49 mm $$times$$ 49 mm. In R&D to prepare for the ITER CS conductor manufacturing, full size conductor performance test and jacket welding test and mechanical tests have been performed. In the presentation, the R&D activities are presented, showing that as a result of this R&D, the CS conductor manufacturing technologies have been confirmed to start the procurement of the CS conductor.

Oral presentation

Preparation for procurement of ITER CS conductor jacket

Ozeki, Hidemasa; Hamada, Kazuya; Nunoya, Yoshihiko; Kawano, Katsumi; Takahashi, Yoshikazu; Oshikiri, Masayuki; Saito, Toru; Matsunami, Masahiro*; Teshima, Osamu*

no journal, , 

no abstracts in English

Oral presentation

Progress of procurement of ITER central solenoid jacket

Ozeki, Hidemasa; Hamada, Kazuya; Takahashi, Yoshikazu; Nunoya, Yoshihiko; Kawano, Katsumi; Oshikiri, Masayuki; Saito, Toru; Isono, Takaaki; Teshima, Osamu*; Matsunami, Masahiro*

no journal, , 

no abstracts in English

Oral presentation

Characteristics of current sharing temperature of ITER CS insert conductor

Nabara, Yoshihiro; Suwa, Tomone; Ozeki, Hidemasa; Sakurai, Takeru; Kajitani, Hideki; Iguchi, Masahide; Hemmi, Tsutomu; Shimono, Mitsugu; Ebisawa, Noboru; Sato, Minoru; et al.

no journal, , 

no abstracts in English

Oral presentation

Test results of CS insert for ITER; Test method

Isono, Takaaki; Kawano, Katsumi; Ozeki, Hidemasa; Saito, Toru; Nabara, Yoshihiro; Suwa, Tomone; Shimono, Mitsugu; Ebisawa, Noboru; Sato, Minoru; Uno, Yasuhiro; et al.

no journal, , 

JAEA is procuring conductors for ITER Central Solenoid (CS) and has evaluated its superconducting performance using CS Model Coil Test facility. We measured Tcs values during cyclic charge of 16,000 cycles and warm-up and cool-down cycle of 3 times. And we measured effect of coil deformation by electro-magnetic force on Tcs values and performed quench test. In this presentation, test method will be reported.

Oral presentation

Inductive heating test of ITER CS insert coil

Ozeki, Hidemasa; Suwa, Tomone; Isono, Takaaki; Takahashi, Yoshikazu; Kawano, Katsumi; Nabara, Yoshihiro; Saito, Toru; Nunoya, Yoshihiko

no journal, , 

no abstracts in English

22 (Records 1-20 displayed on this page)