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Ninomiya, Kazuhiko*; Kubo, Kenya*; Inagaki, Makoto*; Yoshida, Go*; Chiu, I.-H. ; Kudo, Takuto*; Asari, Shunsuke*; Sentoku, Sawako*; Takeshita, Soshi*; Shimomura, Koichiro*; et al.
Scientific Reports (Internet), 14, p.1797_1 - 1797_8, 2024/01
Times Cited Count：0The amount of C in steel, which is critical in determining its properties, is strongly influenced by steel production technology. We propose a novel method of quantifying the bulk C content in steel non-destructively using muons. This revolutionary method may be used not only in the quality control of steel in production, but also in analyzing precious steel archaeological artifacts. A negatively charged muon forms an atomic system owing to its negative charge, and is finally absorbed into the nucleus or decays to an electron. The lifetimes of muons differ significantly, depending on whether they are trapped by Fe or C atoms, and identifying the elemental content at the muon stoppage position is possible via muon lifetime measurements. The relationship between the muon capture probabilities of C/Fe and the elemental content of C exhibits a good linearity, and the C content in the steel may be quantitatively determined via muon lifetime measurements. Furthermore, by controlling the incident energies of the muons, they may be stopped in each layer of a stacked sample consisting of three types of steel plates with thicknesses of 0.5 mm, and we successfully determined the C contents in the range 0.20 - 1.03 wt% depth-selectively, without sample destruction.
Ohshima, Hiroyuki; Morishita, Masaki*; Aizawa, Kosuke; Ando, Masanori; Ashida, Takashi; Chikazawa, Yoshitaka; Doda, Norihiro; Enuma, Yasuhiro; Ezure, Toshiki; Fukano, Yoshitaka; et al.
Sodium-cooled Fast Reactors; JSME Series in Thermal and Nuclear Power Generation, Vol.3, 631 Pages, 2022/07
This book is a collection of the past experience of design, construction, and operation of two reactors, the latest knowledge and technology for SFR designs, and the future prospects of SFR development in Japan. It is intended to provide the perspective and the relevant knowledge to enable readers to become more familiar with SFR technology.
Takahashi, Naoki; Suzuki, Soju; Saito, Hiroto; Ueno, Takashi; Abe, Sadayoshi; Yamanaka, Atsushi; Tanigawa, Masafumi; Nakamura, Daishi; Sasaki, Shunichi; Mine, Tadaharu
Nihon Genshiryoku Gakkai Homu Peji (Internet), 20 Pages, 2017/05
no abstracts in English
Takahashi, Naoki; Yoshinaka, Kazuyuki; Harada, Akio; Yamanaka, Atsushi; Ueno, Takashi; Kurihara, Ryoichi; Suzuki, Soju; Takamatsu, Misao; Maeda, Shigetaka; Iseki, Atsushi; et al.
Nihon Genshiryoku Gakkai Homu Peji (Internet), 64 Pages, 2016/00
no abstracts in English
Yamamoto, Masaya; Kawahara, Hirotaka; Terakado, Tsuguo; Maeda, Shigetaka; Saito, Hiroto; Aoyama, Takafumi
no journal, ,
Frequency of ATWS (Anticipated Transient Without Scram) and PLOHS(Protected Loss of Heat Sink) are relatively high in Joyo. To identificate the most important accident and to select the subject of Joyo's level 2 PSA (Probabilistic Safety Assessment), frequency of these accidents were estimated through dynamics characteristic analysis and natural circulation analysis with detailed success standard. Moreover, consequence of these accidents were also evaluated. As a results of these evaluation, the most important accident is identified as UTOP and this accident is selected to the subject of Joyo's level 2 PSA.
Saito, Hiroto; Yamamoto, Masaya; Maeda, Shigetaka
no journal, ,
no abstracts in English
Yamamoto, Masaya; Saito, Hiroto; Itagaki, Wataru; Maeda, Shigetaka; Takamatsu, Misao
no journal, ,
Joyo is the main fast neutron irradiation facility to develop materials for nuclear industry in Japan. Toward restart, application for relicensing in accordance with newly established regulatory requirements is under discussion. After re-start, we would like to play a enhanced role of fast neutron irradiation experiments. In order to discuss with irradiation materials researchers, introduce the irradiation capabilities of Joyo after re-start.
Itagaki, Wataru; Saito, Hiroto; Yamamoto, Masaya; Takamatsu, Misao; Maeda, Shigetaka
no journal, ,
JAEA applied for inspections of Joyo under the new regulation on March 30, 2017. It is undergoing NRA's safety review against core modification to MK-IV 100 MW irradiation core, measurement to natural disaster and BDBAs. The MK-IV core will have the maximum fast neutron flux (E 
0.1 MeV) of 10
n/cm
s. This is a high-level fast neutron flux of the irradiation test facilities in the world. Joyo can further enhance its capabilities by tailoring neutron spectrum, decreasing or increasing the irradiation temperature. For an experiment, it is important to evaluate neutron flux, dpa and temperature. Joyo provides accurate evaluation of irradiation conditions based on calculations verified by previous characterization tests and measurement using dosimetry technique. In this presentation, measure to new regulation, schedule for restart and irradiation capability of Joyo are introduced.
Saito, Hiroto; Yamamoto, Masaya; Someya, Hiroyuki*; Itagaki, Wataru; Maeda, Shigetaka; Takamatsu, Misao
no journal, ,
Toward restart, the experimental fast reactor Joyo is now under the safety review by regulatory body. After restart, we would like to play a enhanced role of fast neutron irradiation experiments. In order to discuss with irradiation materials researchers, introduce the irradiation capabilities of Joyo after restart.
Itagaki, Wataru; Saito, Hiroto; Someya, Hiroyuki*; Yano, Yasuhide; Otsuka, Satoshi; Takamatsu, Misao; Maeda, Shigetaka; Sekine, Takashi
no journal, ,
no abstracts in English
