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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.
Kamada, Masaki*; Yoshida, Takuma*; Sugita, Tsukasa*; Okumura, Keisuke
Nihon Genshiryoku Gakkai-Shi ATOMO, 66(2), p.83 - 86, 2024/02
no abstracts in English
Tanimura, Yoshihiko; Yoshitomi, Hiroshi
Nihon Genshiryoku Gakkai-Shi ATOMO, 66(1), p.42 - 45, 2024/01
no abstracts in English
Fukahori, Tokio; Nakayama, Shinsuke; Katabuchi, Tatsuya*; Shigyo, Nobuhiro*
Nihon Genshiryoku Gakkai-Shi ATOMO, 65(12), p.726 - 727, 2023/12
The Investigative Committee on Nuclear Data investigates and observes global trends in nuclear research and development and conducts comprehensive examinations of Japanese nuclear data activities from a broader perspective, as well as cooperation with domestic and foreign academic institutions in a wide range of fields other than the Atomic Energy Society. We aim to establish a system for communication, information exchange, and interdisciplinary cooperation. In this report, we will report on three of the main activities for the 2021-2022 term: a request list site for nuclear data, human resource development, and roadmap production.
Nakayama, Hiromasa; Satoh, Daiki
Nihon Genshiryoku Gakkai-Shi ATOMO, 65(10), p.621 - 624, 2023/10
We developed a local-scale high-resolution atmospheric dispersion and dose assessment system (LHADDAS) for safety and consequence assessment of nuclear facilities and emergency response to nuclear accidents or deliberate releases of radioactive materials in built-up urban areas. This system comprises three parts: preprocessing of input files, and main calculation by a local-scale high-resolution atmospheric dispersion model using large-eddy simulation (LOHDIM-LES) and a real-time urban dispersion simulation model based on a lattice Boltzmann method (CityLBM), and postprocessing of dose calculation by a simulation code powered by lattice dose-response functions (SIBYL). We introduce front line of countermeasures against radiation terrorism in urban area as an example.
Fukui, Yasuhito
Nihon Genshiryoku Gakkai-Shi ATOMO, 65(9), p.564 - 567, 2023/09
This article explains that how the international law prevents armed attacks to nuclear power plant based on the lex lata basis. Four points are raised, in other words, first, how the current international law prohibit armed attacks to the nuclear power plant. Second, the current international law can prevent the armed attacks effectively. Third, if the law lacks the effectiveness, what kind of framework or response are necessary. Fourth, if these legal frameworks are applied to the nuclear power plants in Japan, how these will be accommodated are explained.
Oba, Yojiro; Sasaki, Hirokazu*
Nihon Genshiryoku Gakkai-Shi ATOMO, 65(8), p.499 - 502, 2023/08
no abstracts in English
Ohno, Shuji; Yamano, Hidemasa
Nihon Genshiryoku Gakkai-Shi ATOMO, 65(7), p.438 - 442, 2023/07
This report mainly introduces international/domestic development trends of advanced reactor systems that can coexist with renewable energy in addition to describing the importance of dispatchable energy for the extension of variable renewable energy.
Tsuchiya, Kunihiko
Nihon Genshiryoku Gakkai-Shi ATOMO, 65(6), p.393 - 397, 2023/06
no abstracts in English
Abe, Shinichiro
Nihon Genshiryoku Gakkai-Shi ATOMO, 65(5), p.326 - 330, 2023/05
Non-destructive faults (the so-called soft errors) in microelectronics caused by environmental radiation such as neutrons and muons have been recognized as a serious reliability problem. The number of microelectronics requiring high reliability increases with the growth of the information society. Therefore, it is not realistic to evaluate the soft error rate (SER) of all microelectronics by measurement. Moreover, the evaluation of SER in the pre-manufacturing stage is sometimes required. As a result, the evaluation of SER by simulation become more important. We have developed the soft error simulation method with PHITS code. We have also simulated the neutron- and muon-induced soft errors. These results will be reported in the journal of the Atomic Energy Society of Japan (AESJ) as the explanatory article.
Ikeda, Nobuo*; Wakabayashi, Genichiro*; Uno, Masayoshi*; Yoshinaka, Kazuyuki
Nihon Genshiryoku Gakkai-Shi ATOMO, 65(5), p.304 - 305, 2023/05
no abstracts in English
Shimada, Kazumasa; Nagai, Haruyasu; Hashimoto, Makoto; Iimoto, Takeshi*
Nihon Genshiryoku Gakkai-Shi ATOMO, 65(5), P. 290, 2023/05
This article is part of the special feature article "What should be done from now on after the 1F accident and what should be conveyed to the next generation after the 1F accident?" of the Atomic Energy Society of Japan, which summarizes the discussions and future proposals on nuclear disaster prevention in which the members of the Health Physics and Environment Science Subcommittee have been involved. In view of the recommendations of the Accident Investigation Committee of the Atomic Energy Society of Japan and the Meteorological Society of Japan, the behavior of radioactive plumes and the prediction of residents' evacuation behavior should be studied to support decision-making on evacuation and other protective measures for residents in and outside the UPZ. Furthermore, decision-making on protective measures and practical risk communication to residents based on radiation health risks to residents and ethical aspects are newly proposed.
Yamashita, Shinichiro
Nihon Genshiryoku Gakkai-Shi ATOMO, 65(4), p.233 - 237, 2023/04
In the wake of the accident at the Fukushima Daiichi Nuclear Power Plant (NPP) of TEPCO due to the Great East Japan Earthquake in 2011, interest in the early implementation of accident tolerant fuel (ATF) not only for many existing NPPs but also for future NPPs, which is expected to dramatically improve the safety of light water reactors, has increased globally, and research and development is currently underway in many countries around the world. In this article, an overview of domestic ATF technology development that has been carried out with the support of the Ministry of Economy, Trade and Industry since 2015, will be introduced.
Tazaki, Makiko
Nihon Genshiryoku Gakkai-Shi ATOMO, 65(3), p.183 - 186, 2023/03
no abstracts in English
Sakai, Akihiro; Kamei, Gento; Sakamoto, Yoshiaki
Nihon Genshiryoku Gakkai-Shi ATOMO, 65(1), p.25 - 29, 2023/01
Currently, radioactive waste generated from research institutes, etc. is keeping in storage facilities without being disposed of. In order to solve this problem, the Japan Atomic Energy Agency (JAEA) is proceeding with the project for concrete-pit disposal and trench disposal of these waste. This paper introduces the characteristics of the waste and disposal facilities planned by the JAEA, as well as the status of development of the siting criteria for the disposal facility.
Inagaki, Satomi; Hayakawa, Misa
Nihon Genshiryoku Gakkai-Shi ATOMO, 64(12), p.686 - 690, 2022/12
no abstracts in English
Mineo, Hideaki
Nihon Genshiryoku Gakkai-Shi ATOMO, 64(11), p.617 - 621, 2022/11
In December 2016 Decisions were made by the Government on the Fast Breeder Prototype Reactor "Monju", which were decommissioning of the reactor and installation of a new research reactor at the Monju site. After the decisions, MEXT started research to list reactor candidates suitable for the site. Among the candidates, medium power reactor type of which thermal output less than 10,000 kW was chosen to utilize neutron beams. Then, from 2020, MEXT launched an entrusted business and adopted JAEA, Kyoto University and University of Fukui as the core institutions of the business to carry out the conceptual design. This paper describes the system to proceed the conceptual design and to examine the utilization management of the new research reactor and also shows their status.
Tamai, Hiroshi
Nihon Genshiryoku Gakkai-Shi ATOMO, 64(8), p.465 - 467, 2022/08
Though nuclear safety and nuclear security share the same goal of protecting the public and the environment from the harmful effects of ionizing radiation, their response actions may have differences, especially during transport, where protection could be vulnerable. The interface between them is a major issue. In December 2021, with the aim of complementarily strengthening nuclear safety and nuclear security in the transportation of radioactive materials IAEA published a related technical report and held an international conference. The outline of the technical report and the international conference is introduced.
Yoshizawa, Michio
Nihon Genshiryoku Gakkai-Shi ATOMO, 64(8), p.439 - 441, 2022/08
no abstracts in English
