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Aoyagi, Kazuhei; Ozaki, Yusuke; Hayano, Akira; Ono, Hirokazu; Tachi, Yukio
Nihon Genshiryoku Gakkai-Shi ATOMO
, 67(6), p.354 - 358, 2025/06
Japan Atomic Energy Agency launched the Horonobe International Project (HIP) utilizing the Horonobe Underground Research Laboratory. The main objectives of this project are to develop and demonstrate advanced technologies to be used in repository design, operation and closure and a realistic safety assessment in deep geological disposal, and to encourage and train the next generation of engineers and researchers. In this review, an overview of the HIP is presented.
Usami, Hiroshi; Yoshinaga, Kyohei*; Fujikawa, Keigo*
Nihon Genshiryoku Gakkai-Shi ATOMO, 67(5), p.295 - 299, 2025/05
no abstracts in English
Oigawa, Hiroyuki
Nihon Genshiryoku Gakkai-Shi ATOMO, 67(4), P. 248, 2025/04
no abstracts in English
Kamada, So*; Hirao, Yoshihiro*; Suyama, Kenya; Iwamoto, Osamu
Nihon Genshiryoku Gakkai-Shi ATOMO, 67(4), p.238 - 242, 2025/04
no abstracts in English
Tanabe, Kosuke*; Komeda, Masao; Toh, Yosuke; Kitamura, Yasunori*; Misawa, Tsuyoshi*
Nihon Genshiryoku Gakkai-Shi ATOMO, 67(3), p.198 - 202, 2025/03
no abstracts in English
Terada, Hiroaki; Tsuzuki, Katsunori; Kadowaki, Masanao; Nagai, Haruyasu
Nihon Genshiryoku Gakkai-Shi ATOMO, 67(2), p.113 - 117, 2025/02
no abstracts in English
Iwamoto, Osamu
Nihon Genshiryoku Gakkai-Shi ATOMO, 67(2), p.103 - 107, 2025/02
no abstracts in English
Hattori, Takanori; Komatsu, Kazuki*
Nihon Genshiryoku Gakkai-Shi ATOMO, 66(12), p.618 - 622, 2024/12
The high-pressure neutron diffractometer PLANET is the first beamline dedicated to high-pressure neutron experiments in Japan. It was constructed at the Materials and Life Science Experimental Facility (MLF) in the Japan Proton Accelerator Research Complex (J-PARC) located at Tokai-mura in Ibaraki Prefecture. Energy-dispersive data measurement using pulsed neutrons, state-of-the-art optical instruments, and a high-pressure device enable us to analyze the structure of crystals, liquids, and glasses over a wide range of pressure and temperature with unprecedented accuracy. In this paper, we will show how this has been achieved and introduce the recently published results on the symmetrization of hydrogen bonds in ice.
Yamano, Hidemasa; Toyooka, Junichi; Sato, Hiroyuki; Sakaba, Nariaki
Nihon Genshiryoku Gakkai-Shi ATOMO, 66(12), p.607 - 611, 2024/12
This report mainly introduces trends in fast reactor development in Japan in addition to introducing overseas development trends for major developing countries.
Futagami, Satoshi
Nihon Genshiryoku Gakkai-Shi ATOMO, 66(11), p.555 - 559, 2024/11
no abstracts in English
Zheng, X.; Tamaki, Hitoshi; Shibamoto, Yasuteru; Maruyama, Yu
Nihon Genshiryoku Gakkai-Shi ATOMO, 66(11), p.565 - 569, 2024/11
no abstracts in English
Ieda, Junichi; Fukada, Yukimasa; Fukuda, Tatsuo
Nihon Genshiryoku Gakkai-Shi ATOMO, 66(10), p.521 - 524, 2024/10
no abstracts in English
Shibata, Hiroki; Saito, Hiroaki; Hayashi, Hirokazu; Takano, Masahide
Nihon Genshiryoku Gakkai Wabun Rombunshi (Internet), 23(3), p.74 - 80, 2024/08
Partitioning and transmutation of minor actinides techniques have been developed to reduce the radiotoxicity and volume in the high-level radioactive wastes. Minor actinide nitride fuel has been chosen as a candidate for transmutation of long-lived nuclides by accelerator-driven system. Understanding irradiation behavior of nitride fuel is important for its design and development, however, experimental data on irradiation tests of actinide nitrides and these solid solutions are scarce. Recently, in JAEA, nitride fuel performance analysis module based on light water reactor fuel performance code, FEMAXI-7, has been developed to simulate irradiation behavior of the nitride fuel. In this study, performance analysis was carried out focusing on the pellet-cladding mechanical interaction (PCMI), which was pointed out as the most effective factor for the fuel safety during irradiation. Simulation results show that PCMI does not cause the creep rupture of the cladding.
Iimoto, Takeshi*; Shimada, Kazumasa; Hashimoto, Makoto; Nagai, Haruyasu; Hohara, Shinya*; Murakami, Kenta*
Nihon Genshiryoku Gakkai-Shi ATOMO, 66(7), p.356 - 360, 2024/07
no abstracts in English
Nankawa, Takuya; Sekine, Yurina; Yamada, Teppei*
Nihon Genshiryoku Gakkai Wabun Rombunshi (Internet), 23(2), p.50 - 63, 2024/06
Selective separation of radioactive ions is essential for reducing or cleaning radioactive wastes. Among the radioisotopes to be removed, 
Sr poses a major threat to human health and the environment. However, removal of Sr from environmental wastewater is still challenging due to the difficulty of separating Sr
from Ca. Here, we developed a series of isostructural lanthanide oxalate frameworks (LOFs) comprising oxalate and eight kinds of lanthanide (Ln) ions, i.e., from Samarium (Sm) to Thulium (Tm) for application to selective removal of Sr from wastewater using its tuned porous structure. The LOFs had ion exchangeable anionic pores, in which the size of the pores changed in a stepwise manner depending on the host Ln species. When Tb was the host Ln of the LOF, the LOF showed extremely high Sr selectivity and was able to distinguish the subtle difference in ionic radius (0.2 
) between Sr and Ca. The Sr selectivity was higher than that of conventional adsorbents. The pore size tuning of the LOFs by selecting the constituent Ln species yielded a highly ion-selective adsorbent material. This novel strategy will be useful in developing custom porous materials that are easy to prepare and applicable across various fields.
Yamaguchi, Masatake
Nihon Genshiryoku Gakkai-Shi ATOMO, 66(6), p.291 - 294, 2024/06
First-principles calculations of lattice defects in metals became available around year 2000 and were gradually performed for planar defects such as surface and grain boundaries, point defects such as atomic vacancies, and line defects such as dislocation cores, in the order of ease of calculation. The author introduces some examples of first-principles calculations of microscopic properties, which seem to strongly influence macroscopic material properties.
Terasaka, Yuta; Iimoto, Takeshi*; Saso, Michitaka*; Fujita, Reiko*
Nihon Genshiryoku Gakkai-Shi ATOMO, 66(4), p.203 - 207, 2024/04
no abstracts in English
Murakami, Kenta*; Onizawa, Kunio; Yamamoto, Akio*
Nihon Genshiryoku Gakkai-Shi ATOMO, 66(4), p.199 - 202, 2024/04
The Standards Committee of Atomic Energy Society of Japan has been leading activities related to long-term operation through the revision of the Code of Practice for Aging Management, and we believe that we must continue to make important contributions in light of recent changes in laws and regulations. This paper recapitulates the discussions in the special session conducted at the 2023 fall meeting, and describes the efforts toward safe long-term operation and the points to keep in mind in the standardization of such activities. The important points are (1) to make effective use of knowledge found over time, (2) not to overlook new knowledge that has a significant impact on safety, including obsolescence, (3) to assign a level of importance to the response based on the impact on safety and the likelihood of its occurrence, and (4) to contribute to the establishment of an international knowledge base.
Sato, Tatsuhiko
Nihon Genshiryoku Gakkai-Shi ATOMO, 66(3), p.143 - 145, 2024/03
DNA damage calculation using the track-structure mode of PHITS will be summarized in this report.
Ikeuchi, Hirotomo; Koyama, Shinichi
Nihon Genshiryoku Gakkai-Shi ATOMO, 66(2), p.74 - 78, 2024/02
For the steady removal of fuel debris from the TEPCO's Fukushima Daiichi Nuclear Power Station (1F), it is an urgent issue to establish analysis technology and systems for fuel debris samples with unknown properties (unknown samples). For this purpose, through analysis tests using samples with known properties (simulated fuel debris) and discussions among experts, the validity of analysis results and the factors that cause errors has been identified. In addition to knowing the current level of analysis accuracy, studies are being conducted to understand and improve the influencing factors. This paper introduces a part of the development of infrastructure for analysis and evaluation technology of "nuclides and element content."
