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Sn conductor for ITER central solenoidTakahashi, Yoshikazu; Nabara, Yoshihiro; Ozeki, Hidemasa; Hemmi, Tsutomu; Nunoya, Yoshihiko; Isono, Takaaki; Matsui, Kunihiro; Kawano, Katsumi; Oshikiri, Masayuki; Uno, Yasuhiro; et al.
IEEE Transactions on Applied Superconductivity, 24(3), p.4802404_1 - 4802404_4, 2014/06
Times Cited Count：26 Percentile：74.52(Engineering, Electrical & Electronic)Japan Atomic Energy Agency (JAEA) is procuring all amounts of NbSn conductors for Central Solenoid (CS) in the ITER project. Before start of mass-productions, the conductor should be tested to confirm superconducting performance in the SULTAN facility, Switzerland. The original design of cabling twist pitches is 45-85-145-250-450 mm, called normal twist pitch (NTP). The test results of the conductors with NTP was that current shearing temperature (Tcs) is decreasing due to electro-magnetic (EM) load cycles. On the other hand, the results of the conductors with short twist pitches (STP) of 25-45-80-150-450 mm show that the Tcs is stabilized during EM load cyclic tests. Because the conductors with STP have smaller void fraction, higher compaction ratio during cabling is required and possibility of damage on strands increases. The technology for the cables with STP was developed in Japanese cabling suppliers. The several key technologies will be described in this paper.
Sn strandsOsamura, Kozo*; Machiya, Shutaro*; Tsuchiya, Yoshinori*; Suzuki, Hiroshi; Shobu, Takahisa; Sato, Masugu*; Hemmi, Tsutomu; Nunoya, Yoshihiko; Ochiai, Shojiro*
Superconductor Science and Technology, 25(5), p.054010_1 - 054010_9, 2012/05
Times Cited Count：17 Percentile：59.15(Physics, Applied)Sn cables for ITER toroidal field coilsIsono, Takaaki; Tsutsumi, Fumiaki; Nunoya, Yoshihiko; Matsui, Kunihiro; Takahashi, Yoshikazu; Nakajima, Hideo; Ishibashi, Tatsuji*; Sato, Go*; Chida, Keiji*; Suzuki, Rikio*; et al.
Teion Kogaku, 47(3), p.147 - 152, 2012/03
no abstracts in English
Koyama, Shinichi; Ozawa, Masaki; Kurosawa, Kiyoko*; Tatenuma, Katsuyoshi*; Sato, Yoshihiko*; Okada, Ken*
Journal of Radioanalytical and Nuclear Chemistry, 286(3), p.807 - 813, 2010/12
Times Cited Count：1 Percentile：9.92(Chemistry, Analytical)A multi-functional separation process is proposed on the Adv.-ORIENT cycle concept. In this process, hydrochloric acid, mixture of nitric acid and methanol should be used as eluents. Two important subjects should be solved so as to prove the availability. One is corrosion aspect for the use of HCl solution, Tantalum was anti-corrosive in HCl media, and Hastelloy-B seemed to be acceptable at RT, with evidence of low corrosion rate (
0.1 mm/y). The other is explication of the reactive safety between ion exchange resin and solvent (nitric acid and methanol). The reaction occurred regardless of nitric acid concentration and presence or absence of methanol when the temperature of heater reached 220 
C. However, it was confirmed that the reaction did not occur when the heating temperature decreased.
Sato, Yoshihiko*; Okada, Ken*; Akiyoshi, Miyako*; Matsunaga, Takehiro*; Suzuki, Tatsuya*; Koyama, Shinichi; Ozawa, Masaki
Proceedings of International Conference on Advanced Nuclear Fuel Cycle; Sustainable Options & Industrial Perspectives (Global 2009) (CD-ROM), p.962 - 969, 2009/09
The fundamental thermochemical properties of tertiary pyridine resin (TPR) and its mixtures with methanol/HCl and HNO were investigated and heating tests on gram scale with TPR/methanol/HNO were carried out. It was found that TPR with HCl was thermally stable. Evident thermal decomposition peaks were identified with TPR in the presence of concentrated HNO. No specific effect was observed for methanol involving. However, it was considered that the rapidly exothermic reaction can be controlled by heating temperature.
Tanimura, Yoshihiko; Sato, Tatsuhiko; Kumada, Hiroaki; Terunuma, Toshiyuki*; Sakae, Takeji*; Harano, Hideki*; Matsumoto, Tetsuro*; Suzuki, Toshikazu*; Matsufuji, Naruhiro*
Hoshasen, 34(2), p.135 - 139, 2008/04
Recently the traceability system (JCSS) of neutron standard based on the Japanese law "Measurement Act" has been instituted. In addition, importance of the neutron dose evaluation has been increasing in not only the neutron capture medical treatment but also the proton or heavy particle therapy. Against such a background, a symposium "Neutron dosimetry in neutron fields; From detection techniques to medical applications" was held on March 29, 2008 and recent topics on the measuring instruments and their calibration, the traceability system, the simulation technique and the medical applications were introduced. This article summarizes the key points in the discussion at the symposium.
Yagai, Tsuyoshi*; Sato, Hidenari*; Tsuda, Makoto*; Hamajima, Takataro*; Nunoya, Yoshihiko; Takahashi, Yoshikazu; Okuno, Kiyoshi
IEEE Transactions on Applied Superconductivity, 16(2), p.835 - 838, 2006/06
Times Cited Count：7 Percentile：40.62(Engineering, Electrical & Electronic)AC losses in the CIC conductor consist of both regular loss that are proportional to cable twisting pitch squared and irregular loss that could not be estimated from short conductor sample results. It was explained from our previous works that irregular loops produce the losses with long time constants up to several hundred seconds. The observed long time constant indicates that contact conditions between the two strands forming the loop should be line contact. We traced the sample conductor with 1 m in length. The measured results show that large displacements of strands from their original positions due to compressing the conductor provide many line contacts. It is found that the averaged line contact length reaches about 10 mm that is three orders of magnitude larger than the 0.01 mm of point contact length.
Sakasai, Akira; Ishida, Shinichi; Matsukawa, Makoto; Akino, Noboru; Ando, Toshinari*; Arai, Takashi; Ezato, Koichiro; Hamada, Kazuya; Ichige, Hisashi; Isono, Takaaki; et al.
Nuclear Fusion, 44(2), p.329 - 334, 2004/02
no abstracts in English
Sakasai, Akira; Ishida, Shinichi; Matsukawa, Makoto; Akino, Noboru; Ando, Toshinari*; Arai, Takashi; Ezato, Koichiro; Hamada, Kazuya; Ichige, Hisashi; Isono, Takaaki; et al.
Nuclear Fusion, 44(2), p.329 - 334, 2004/02
Times Cited Count：7 Percentile：22.85(Physics, Fluids & Plasmas)no abstracts in English
Sato, Yoshihiko; ; ; Nojiri, Ichiro
JNC TN8410 2001-027, 46 Pages, 2002/03
JNC-TN8410-2001-027.pdf:0.57MB
Safety study "Study of evaluation of abnormal occurrence for chemical substances in the nuclear fuel facilities" will be carried out from 2001 to 2005. In this study, the prediction of thermal hazards of chemical substances will be investigated and prepared. The hazard prediction method of chemical substances will be constructed from these results. Therefore, the hazard prediction methods applied in the chemical engineering in which the chemical substances with the hazard of fire and explosion were often treated were investigated. CHETAH (The ASTM Computer Program for Chemical Thermodynamic and Energy Release Evaluation) developed by ASTM (American Society for Testing and Materials) and TSS (Thermal Safety Software) developed by CISP (ChemInform St. Petersburg) were introduced and the fire and explosion hazards of chemical substances and reactions in the reprocessing process were evaluated. From these evaluated results, CHETAH could almost estimate the heat of reaction at 10% accuracy. It was supposed that CHETAH was useful as a screening for the hazards of fire and explosion of the new chemical substances and so on. TSS could calculate the reaction rate and the reaction behavior from the data measured by the various calorimeters rapidly. It was supposed that TSS was useful as an evaluation method for the hazards of fire and explosion of the new chemical reactions and so on.
Sato, Yoshihiko; Koyama, Tomozo; Miura, Akihiko; ; ; Shigetome, Yoshiaki
Proceedings of 2nd International Conference on Safewaste 2000, 0 Pages, 2000/10
On march 11,1997, bituminization demonstration facility(BDF) in Tokai Reprocessing Plant (TRP) of power reactor and nuclear fuel development corporation (PNC) made fire and explosion incident. Investigation of the cause of the fire and explosion incident at BDF was carefully conducted. The main cause of the fire is clarified to have been physical heating inside the extruder that provided unusual high temperature of bituminized product at filling. Physical feating is considered to be derived from decrease of feed rate of liquid waste to the extruder. The causes of the explosion are accumulation offlammable gas generated from insufficiently extinguished bituminized product inside the filling room of which the ventilation system was shut doen. The gas was ignited by another ignition of the heated drum.
Miura, Akihiko; Sato, Yoshihiko; ; Koyama, Tomozo; Maki, Akira
Saikuru Kiko Giho, (8), p.1 - 12, 2000/09
None
Shigetome, Yoshiaki; ; ; Miura, Akihiko; Sato, Yoshihiko; Koyama, Tomozo
JNC TN8200 99-001, 128 Pages, 1999/07
None
Koyama, Tomozo; ; Miura, Akihiko; ; Sato, Yoshihiko; Shigetome, Yoshiaki
International workshop on the safty and perfo, 0 Pages, 1999/07
None
Sato, Yoshihiko; ; ;
JNC TN8400 99-008, 58 Pages, 1999/02
In advanced nuclear fuel recycling technological R&D, The upgrading research in the fast reactor fuel cycle which the transuranics is separated and collected from the high-level activity liquid waste and is made to burn using fast reactor is carried out. In CMPO which is new extracting agent that the use is examined and TRUEX solvent which is the CMPO mixed solvent, for the purpose of evaluating accurately exothermic reaction behavior and gas generation behavior of the exothermic reaction between solvent and nitric acid in the evaporator in research installation in the future, analysis and evaluation model and investigation and examination of the physical property necessary for the analysis evaluation were carried out, while analysis and evaluation example of the exothermic reaction between solvent and nitric acid in the evaporator are investigated, and the test calculation was carried out. On the exothermic reaction between organic solvent and nitric acid in the evaporator, analysis evaluation example carried out until now was investigated. It was proven that there are method for deducing self accelerated reaction temperature from the steady heat balance style and the method for doing the transient analysis of temperature rise by exothermic reaction with nitric acid organic solvent nitric acid, of that the method for deciding the reaction rate of exothermic reaction in proportion to various conditions. And, it was confirmed that the method for doing the tansient analysis of temperature rise by exothermic reaction between organic solvent and nitric acid is most safe side and most realistic evaluation technique in the method of the superscription. Based on the examination of the superscription, it carried out preparation of analysis and evaluation model of the exothermic reaction between organic solvent and nitric acid in the evaporator and examination of the analysis method, and it became possible that it realistically handles the behavior of the exothermic ...
Sato, Yoshihiko; ; ; ;
JNC TN8400 99-006, 75 Pages, 1999/02
In order to confirm the engineering safety on the TRUEX solvent (mixed solvent of CMPO/TBP/n-dodecane) for separating the transuranics from high-level activity liquid waste in advanced nuclear fuel recycling technological R&D, thermal behavior and pressure behavior in heating PUREX solvent (mixed solvent of 30% TBP-n-dodecane), TRUEX solvent and in the exothermic reaction of TRUEX solvent etc. and nitric acid in sealed adiabatic system which was severer condition than actual plant were measured by using accelerating rate calorimeter (ARC). The Arrhenius parameters (activation energy and frequency factor) which are necessary for the evaluation of reaction rate was examined from the measurement data in ARC. Analytical method and analysis condition of reaction products were examined in order to clarify chemical form of reaction products in exothermic reaction between solvent and nitric acid in ARC, and the qualitative evaluation was carried out. Main results are shown in the following. (1)TBP, CMPO, n-dodecane and 10M nitric acid hardly exothermed in the simple substance. (2)On the solvent phase after the solvent contacted 10M nitric acid and chose equilibrious (single phase system sample), it tended to be bigger the heat quantity per unit sample weight of the TRUEX solvent than the PUREX solvent when heat quantity was evaluated in ARC. However, on the sample enclosed solvent and 10M nitric acid in sample container simultaneously (two phase system sample), the heat quantity per unit solvent weight was almost equivalent for PUREX solvent and TRUEX solvent. (3)The kinetic analysis was carried out, and on the TBP-10M nitric acid single phase system sample, the activation energy of the reaction was evaluated with 118kJ/mol. Its activation energy was approximate to 112kJ/mol by Nichols. Reaction rate canstant was calculated, and it was shown that reaction rate constant of PUREX solvent-10M nitric acid single phase system sample and TRUEX solvent-10M nitric acid ...
; ; Kurosawa, A.; Hayashi, Naomi; Kobayashi, Kentaro; Kitajima, Takafumi; Sato, Yoshihiko
PNC TN8410 98-047, 278 Pages, 1998/02
The fire and explosion incident occurred at the Bituminization Demonstration Facility of the Tokai Reprocessing Plant on march 11th, 1997. For investigation of Bituminization Demonstration Facility Incident and prevention relapse, Investigation Group for Bituminization Demonstration Facility incident was set up. It has been investigated the situation at the time of incident was occurred. The result of investigated was presented for Science and Technology Agency. This report is arranged the result of investigated the situation for investigation and prevention relapse.
Al conductorNakajima, Hideo; Nunoya, Yoshihiko; O.Ivano*; Ando, Toshinari; Kawasaki, T.*; Hanawa, Hiromi*; Seki, Shuichi*; Takano, Katsutoshi*; Tsuji, Hiroshi; ; et al.
Advances in Cryogenic Engineering Materials, Vol.42, p.323 - 330, 1996/00
no abstracts in English
Sato, Hidenori*; Yagai, Tsuyoshi*; Tsuda, Makoto*; Hamajima, Takataro*; Nunoya, Yoshihiko; Okuno, Kiyoshi
no journal, ,
no abstracts in English
Okada, Ken*; Sato, Yoshihiko*; Akiyoshi, Miyako*; Matsunaga, Takehiro*; Suzuki, Tatsuya*; Koyama, Shinichi; Ozawa, Masaki
no journal, ,
Gram scale heat experiment for thermal stability of tertiary pyridine resin was performed by the condition of resin/methanol/nitric acid and hydrochloric acid systems as a part of development for advanced ORIENT cycle.
