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Naganuma, Masaki; Ohara, Yoshiyuki; Miyamoto, Yasunori*; Murashita, Tatsuya*; Makita, Akinori*; Nohiro, Tetsuya*
JAEA-Technology 2014-012, 11 Pages, 2014/06
JAEA-Technology-2014-012.pdf:1.06MB
In Japan Atomic Energy Agency Ningyo-toge environmental engineering center, exploration for uranium and technical development of uranium refining, conversion and enrichment which are the front end of a nuclear fuel cycle have been performed since 1955. In 2002, we introduced Q2 low-level-waste drum measuring system which is a bulk measuring method of the passive 
ray. In 2007, OS2 analyzing operation system which was used in Q2, was replaced with windows system. This replacement improved the performance of the analysis of Q2. But quantified values of uranium obtained from win system did not correspond exactly to OS2 system. We considered whether the drum which was measured by OS2 system, was measured again by windows system. But it was difficult to measure these drum by win system. So in this study, we studied a calculation method for adjusting quantified values of uranium obtained by each system.
Shibata, Yoshihide; Isayama, Akihiko; Matsunaga, Go; Kawano, Yasunori; Miyamoto, Seiji*; Lukash, V.*; Khayrutdinov, R.*; JT-60 Team
Plasma and Fusion Research (Internet), 9(Sp.2), p.3402084_1 - 3402084_5, 2014/06
We performed the disruption simulation using DINA code to investigate the effect of the electron temperature 
on the plasma current decay after the initial phase of current quench (CQ). In this calculation, we used the measured profile during the initial phase of CQ. After the initial phase of CQ, we assumed that the profile does not change in time and used the value at the end of the initial phase of current quench because profile could not be measured after the initial phase of CQ. From the simulation results, it was found that the time evolution of plasma current calculated by DINA was similar to experimental one in this calculation. However, the time evolution of profile in this calculation was different from the measured profile because Te after first mini-collapse rapidly decreased until the value below a measurement limit (less than 0.1 keV). Moreover, the time evolution of poloidal cross-section S calculated by DINA code was rapidly decreased although the experimental one was gradually decreased. The plasma current decay during the disruption is determined by various parameters, 
, and S. It is necessary to evaluate the effect of profile on the plasma current decay after the initial phase of CQ by using various assumed model and DINA code.
Shibata, Yoshihide; Isayama, Akihiko; Miyamoto, Seiji*; Kawakami, Sho*; Watanabe, Kiyomasa*; Matsunaga, Go; Kawano, Yasunori; Lukash, V.*; Khayrutdinov, R.*; JT-60 Team
Plasma Physics and Controlled Fusion, 56(4), p.045008_1 - 045008_8, 2014/04
Times Cited Count：3 Percentile：15.46(Physics, Fluids & Plasmas)In JT-60U disruption, the plasma current decay during the initial phase of current quench has been calculated by a disruption simulation code (DINA) using the measured electron temperature profile. In the case of fast plasma current decay, has a peaked profile just after thermal quench and the profile doesn't change significantly during the initial phase of current quench. On the other hand, in the case of the slow plasma current decay, the profile is border just after the thermal quench, and the profile shrinks. The results of DINA simulation show that plasma internal inductance 
increases during the initial phase of current quench, while plasma external inductance 
does not change in time. The increase of is caused by current diffusion toward the core plasma due to the decrease of in intermediate and edge regions. It is suggested that an additional heating in the plasma periphery region has the effect of slowing down plasma current decay.
Miyamoto, Yukihiro; Ikeno, Koichi; Akiyama, Shigenori*; Harada, Yasunori
JAERI-Tech 2002-086, 43 Pages, 2002/11
Description is given for the characteristic radiation environment for the High Intensity Proton Accelerator Facility and the design concept of the radiation control system of it. The facility is a large scale accelerator complex consisting of high energy proton accelerators carrying the highest beam intensity in the world and the related experimental facilities and therefore provides various issues relevant to the radiation environment. The present report describes the specifications for the radiation control system for the facility, determined in consideration of these characteristics.
Miyamoto, Yukihiro; ; Harada, Yasunori
JAERI-Tech 98-039, 44 Pages, 1998/09
no abstracts in English
Kawakami, Sho*; Ono, Noriyasu*; Watanabe, Kiyomasa*; Shibata, Yoshihide; Okamoto, Masaaki*; Miyamoto, Seiji; Isayama, Akihiko; Sugihara, Masayoshi*; Kawano, Yasunori; Lukash, V. E.*; et al.
no journal, ,
no abstracts in English
Shibata, Yoshihide; Isayama, Akihiko; Miyamoto, Seiji; Matsunaga, Go; Kawano, Yasunori; Sugihara, Masayoshi*
no journal, ,
no abstracts in English
Shibata, Yoshihide; Isayama, Akihiko; Matsunaga, Go; Kawano, Yasunori; Miyamoto, Seiji*; Lukash, V. E.*; Khayrutdinov, R.*
no journal, ,
no abstracts in English
