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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
Collaborative Laboratories for Advanced Decommissioning Science; Tokyo Institute of Technology*
JAEA-Review 2022-076, 227 Pages, 2023/03
The Collaborative Laboratories for Advanced Decommissioning Science (CLADS), Japan Atomic Energy Agency (JAEA), had been conducting the Nuclear Energy Science & Technology and Human Resource Development Project (hereafter referred to "the Project") in FY2021. The Project aims to contribute to solving problems in the nuclear energy field represented by the decommissioning of the Fukushima Daiichi Nuclear Power Station (1F), Tokyo Electric Power Company Holdings, Inc. (TEPCO). For this purpose, intelligence was collected from all over the world, and basic research and human resource development were promoted by closely integrating/collaborating knowledge and experiences in various fields beyond the barrier of conventional organizations and research fields. The sponsor of the Project was moved from the Ministry of Education, Culture, Sports, Science and Technology to JAEA since the newly adopted proposals in FY2018. On this occasion, JAEA constructed a new research system where JAEA-academia collaboration is reinforced and medium-to-long term research/development and human resource development contributing to the decommissioning are stably and consecutively implemented. Among the adopted proposals in FY2019, this report summarizes the research results of the "Development of stable solidification technique of ALPS sediment wastes by apatite ceramics" conducted from FY2019 to FY2021. Since the final year of this proposal was FY2021, the results for three fiscal years were summarized. The present study aims to establish an apatite solidification process of radioactive sediment wastes, which were generated from the ALPS process manipulating the large amount of contaminated water from 1F. We selected the precipitation method and post stabilization for engineering-scale process. Investigation on composition, structure and elution properties of apatite and related phosphate waste forms fabricated from the simulated ALPS sediment wastes were implemented.
Collaborative Laboratories for Advanced Decommissioning Science; Tokyo Institute of Technology*
JAEA-Review 2021-077, 217 Pages, 2022/03
The Collaborative Laboratories for Advanced Decommissioning Science (CLADS), Japan Atomic Energy Agency (JAEA), had been conducting the Nuclear Energy Science & Technology and Human Resource Development Project (hereafter referred to "the Project") in FY2020. The Project aims to contribute to solving problems in the nuclear energy field represented by the decommissioning of the Fukushima Daiichi Nuclear Power Station, Tokyo Electric Power Company Holdings, Inc. (TEPCO). For this purpose, intelligence was collected from all over the world, and basic research and human resource development were promoted by closely integrating/collaborating knowledge and experiences in various fields beyond the barrier of conventional organizations and research fields. The sponsor of the Project was moved from the Ministry of Education, Culture, Sports, Science and Technology to JAEA since the newly adopted proposals in FY2018. On this occasion, JAEA constructed a new research system where JAEA-academia collaboration is reinforced and medium-to-long term research/development and human resource development contributing to the decommissioning are stably and consecutively implemented. Among the adopted proposals in FY2019, this report summarizes the research results of the "Development of stable solidification technique of ALPS sediment wastes by apatite ceramics" conducted in FY2020. The present study aims to establish an apatite solidification process of radioactive sediment wastes, which were generated from the ALPS process manipulating the large amount of contaminated water from Fukushima Daiichi Nuclear Power Station. In FY2020, the synthetic scheme and elemental composition were updated to precipitation method to accept the actual ALPS sediment wastes in engineering scale. The synthesis of apatite or phosphate wastes and their molding conditions were surveyed, and the relations among elemental compositions, structures and chemical properties were clarified.
Kojima, Satoru*; Kagami, Saya; Yokoyama, Tatsunori; Kariya, Yoshihiko*; Katayama, Yoshikazu*; Nishio, Gaku*
Proceedings of 5th International Workshop on Rock Mechanics and Engineering Geology in Volcanic Fields (RMEGV 2021) (Internet), 6 Pages, 2021/09
A local tephra embedded in a hand-auger boring core drilled at near-shore of Kinugasanoike Pond about 4.6 km NE of Mt.Yakedake, one of the most active volcanoes in central Japan, is composed mainly of several kinds of volcanic glass shards (microlite-bearing, blocky, fluted and micro-vesicular types) with minor amounts of crystal minerals including quartz, plagioclase, hornblende, biotite, and pyroxene. Plant remains recovered from the horizon 10 cm below the tephra layer yield C ages of 2,331-2,295 (19.2% probability distribution) and 2,270-2,155 (76.2% probability distribution) cal yrs BP. We measured major element compositions of 241 individual glass shards using Electron Probe Micro Analyzer. They are plotted on the SiO
-K
O, SiO
-Na
O+K
O, and FeO
-K
O diagrams in a region different from those of major regional tephras distributed in central Japan. The clast and chemical compositions coincide with those of a tephra embedded in the Nakao pyroclastic flow deposits distributed about 2 km NNW of Mt. Yakedake dated as around 2,300 cal yrs BP. The tephra could be used as a local marker of 2,300 cal yrs BP in the southern part of Northern Japan Alps.
Collaborative Laboratories for Advanced Decommissioning Science; Tokyo Institute of Technology*
JAEA-Review 2020-060, 116 Pages, 2021/02
JAEA/CLADS had been conducting the Nuclear Energy Science & Technology and Human Resource Development Project in FY2019. Among the adopted proposals in FY2019, this report summarizes the research results of the "Development of Stable Solidification Technique of ALPS Sediment Wastes by Apatite Ceramics" conducted in FY2019.
Sato, Junya; Suzuki, Shinji*; Kato, Jun; Sakakibara, Tetsuro; Meguro, Yoshihiro; Nakazawa, Osamu
QST-M-2; QST Takasaki Annual Report 2015, P. 87, 2017/03
no abstracts in English
Kato, Jun; Kakuda, Ayaka; Osugi, Takeshi; Kuroki, Ryoichiro; Koma, Yoshikazu; Nakase, Masahiko*; Utsumi, Kazuo*; Takeshita, Kenji*; Kanagawa, Shun*; Hijikata, Takatoshi*
no journal, ,
no abstracts in English
Oba, Kyoko; Yanase, Noboru*; Matsui, Ryota*
no journal, ,
This report is the content of a discussion held at Fukushima National College of Technology with reference to the Deliberative Poll on the theme of ALPS treated water generated by the decommissioning of the Fukushima Daiichi Nuclear Power Station accident of Tokyo Electric Power Company.
Oba, Kyoko; Yanase, Noboru*; Suzuki, Shigekazu*
no journal, ,
This research is based on the Method of Deliberative Poll regarding Discussion on ALPS Treated Water and Soil from Off site Decontamination Work, which has become a problem due to the decommissioning of the TEPCO Fukushima Daiichi Nuclear Power Plant accident, which is being conducted at universities and national colleges of technology. With an education in mind, the project trains moderators and reporters for group discussions, which are important in discussions. We are also experimenting with an implementation method that includes humanities students and includes on-site visits. We will present the possibilities of education based on the Method of Deliberative Poll.
Fukuda, Yuhei; Arai, Yoichi; Suganuma, Takashi; Hinai, Hiroshi; Sano, Yuichi; Shibata, Atsuhiro; Nomura, Kazunori
no journal, ,
no abstracts in English
Shimada, Asako; Hemmi, Ko; Ohira, Saki; Iida, Yoshihisa
no journal, ,
no abstracts in English
Sato, Junya; Suzuki, Shinji; Nakagawa, Akinori; Kato, Jun; Sakakibara, Tetsuro; Meguro, Yoshihiro; Nakazawa, Osamu
no journal, ,
no abstracts in English
Komada, Ryo*; Yabe, Yuki*; Arai, Tsuyoshi*; Sato, Fuminori
no journal, ,
no abstracts in English
Oba, Kyoko; Yanase, Noboru*; Matsui, Ryota*
no journal, ,
This study designed and conducted a forum for discussions among students of Fukushima National College of Technology on ALPS treated water generated by the decommissioning of the Fukushima Daiichi Nuclear Power Station accident. For the design, we referred to the method of deliberative polls.
Kato, Jun; Osugi, Takeshi; Sone, Tomoyuki; Kuroki, Ryoichiro; Koma, Yoshikazu; Nakase, Masahiko*; Utsumi, Kazuo*; Takeshita, Kenji*; Kanagawa, Shun*; Hijikata, Takatoshi*
no journal, ,
no abstracts in English
Yamagishi, Isao; Kato, Tomoaki
no journal, ,
no abstracts in English