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Nakata, Hisakazu
Genkan Senta Topikkusu, (147), p.4 - 11, 2023/10
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.
Sakai, Akihiro
Genshiryoku Bakkuendo Kenkyu (CD-ROM), 29(1), p.48 - 54, 2022/06
no abstracts in English
Asakura, Kazuki; Shimomura, Yusuke; Donomae, Yasushi; Abe, Kazuyuki; Kitamura, Ryoichi; Miyakoshi, Hiroyuki; Takamatsu, Misao; Sakamoto, Naoki; Isozaki, Ryosuke; Onishi, Takashi; et al.
JAEA-Review 2021-020, 42 Pages, 2021/10
JAEA-Review-2021-020.pdf:2.95MB
The disposal of radioactive waste from the research facility need to calculate from the radioactivity concentration that based on variously nuclear fuels and materials. In Japan Atomic Energy Agency Oarai Research and Development Institute, the study on considering disposal is being advanced among the facilities which generate radioactive waste as well as the facilities which process radioactive waste. This report summarizes a study result in FY2020 about the evaluation method to determine the radioactivity concentration in radioactive waste on Oarai Research and Development Institute.
Asakura, Kazuki; Shimomura, Yusuke; Donomae, Yasushi; Abe, Kazuyuki; Kitamura, Ryoichi
JAEA-Review 2020-015, 66 Pages, 2020/09
JAEA-Review-2020-015.pdf:4.27MB
The disposal of radioactive waste from the research facility need to calculated from the radioactivity concentration that based on variously nuclear fuels and materials. In Japan Atomic Energy Oarai Research and Development Institute, the study on considering disposal is being advanced among the facilities which generate radioactive waste as well as the facilities which process radioactive waste. This report summarizes a study result in FY2019 about the evaluation method to determine the radioactivity concentration in radioactive waste on Oarai Research and Development Institute.
Sakamoto, Yoshiaki
Genshiryoku Bakkuendo Kenkyu (CD-ROM), 26(2), p.127 - 132, 2019/12
JAEA has promoted near surface disposal project for low-level radioactive wastes generated from research, industrial and medical facilities after receiving project approval from the government in 2009. This kind of low level radioactive wastes which were arising from the 1940s are still keeping in each storage buildings. For immediate treatment and disposal of the wastes, technical issue and commercialization of the disposal project are studied by JAEA. The outline of current status of the disposal project of JAEA and some approach to push forward rational treatment and disposal system are presented.
Sakamoto, Yoshiaki
Genshiryoku Bakkuendo Kenkyu (CD-ROM), 24(2), p.141 - 146, 2017/12
Some research reactors are under decommissioning or preparation for application of decommissioning license for regulation authority in our country. The reasonable treatment and disposal of dismantling waste is important for decommissioning of research reactors. Therefore, in this paper, JAEA's approach of the treatment and disposal of dismantling waste was introduced from the point of view of disposal of low level radioactive waste arising from research, industrial and medical facilities.
Sakai, Akihiro
no journal, ,
no abstracts in English
Nakata, Hisakazu; Izumo, Sari; Amazawa, Hiroya; Sakai, Akihiro
no journal, ,
JAEA is working toward the establishment of disposal facilities for waste from research facilities in Japan, in accordance with the Law and the government's basic policy (2008). For burial disposal, it is necessary to make burial waste that meet the acceptance criteria for safety. This report presents the results of tests conducted to confirm the method meeting the waste acceptance criteria for voids as for trench disposal.
Saito, Tatsuo; Nakata, Hisakazu; Kamei, Gento
no journal, ,
Research on nuclear power and radiation is utilized in various fields such as medicine, industry and agriculture, in addition to the energy field, and supports our daily life. In order to make these efforts sustainable in the future, JAEA is working toward the establishment of a burial facility as an implementing entity of the domestic LLW generated in research, medical and industrial facilities, in accordance with the JAEA Law and the national basic policy (2008) based on this law. JAEA is committed to the following basic policies (1) Ensure safety, (2) Ensure transparency and confidence in the project, (3) Promote understanding and coexistence with the local community, (4) Ensure reasonable burden and cooperation from the waste generators, and (5) Implement reasonable disposal practices.
Saito, Tatsuo
no journal, ,
RI waste (waste from research facilities, etc. contaminated with RI) is collected and processed by the Japan Radioisotope Association, but there are no burial facilities, and it continues to be stored. JAEA is positioned by the JAEA Law as the entity responsible for the disposal of RI waste. Currently, JAEA is developing waste acceptance criteria and technical studies for the basic design of a burial facility, and is promoting activities to promote understanding of wastes from research facilities as a response to the siting of a burial facility. With the cooperation of waste generators, JAEA will continue to develop waste acceptance criteria and study the basic design of the burial facility and promote activities for understanding of the burial of wastes from research facilities.
Sakai, Akihiro
no journal, ,
no abstracts in English
Izumo, Sari; Sugaya, Toshikatsu; Nakata, Hisakazu; Sakai, Akihiro
no journal, ,
no abstracts in English
Izumo, Sari; Hayashi, Hirokazu; Nakata, Hisakazu; Kameo, Yutaka; Amazawa, Hiroya; Sakai, Akihiro
no journal, ,
no abstracts in English
Sakai, Akihiro; Nakata, Hisakazu; Amazawa, Hiroya; Kurosawa, Ryohei*; Sato, Makoto*; Kitamura, Yoichi*
no journal, ,
We consider that very low level waste slightly including chemical toxicity material among radioactive waste generated from research, industrial and medical facilities is disposed of in trench disposal facility which is equipped with impermeable layers. We studied the impermeable system which has high performance to prevent the radioactive material from leaching out of waste layer taking into account the combination of geomembrane liners and low permeable materials.
Hayashi, Hirokazu; Izumo, Sari; Nakata, Hisakazu; Tsuji, Tomoyuki; Amazawa, Hiroya; Sakai, Akihiro
no journal, ,
no abstracts in English
Nakata, Hisakazu; Hayashi, Hirokazu; Amazawa, Hiroya; Sakai, Akihiro
no journal, ,
no abstracts in English
Nakata, Hisakazu
no journal, ,
Low level radioactive wastes are generated from the research and development of the nuclear energy, medical and industrial use of radioisotope in Japan. Almost all the wastes are still in storage without conditioning and/or treatment suitable for final disposal. The total amount of the waste is estimated approximately 590,000 drums. In order to promote the disposal project for the waste generated from both JAEA and others, JAEA has become its implementing organization in 2008. Since then, JAEA carried out preliminary design of near surface disposal facilities under generic site conditions and estimated the total project cost to accommodate the waste quantity to be required; 750,000 drums. In addition, site selection plans and technical studies in designing disposal facilities are also being discussed. In this report, it explains technical studies relating to Waste Acceptance Criteria for supporting appropriate waste conditioning and its planned implementation by the generators.
Saito, Tatsuo; Sugaya, Toshikatsu; Sakai, Akihiro; Kamei, Gento
no journal, ,
In Japan, low-level radioactive wastes generated from research institutes, universities and medical institutions are continuously stored without being buried. Therefore, the Japan Atomic Energy Agency (JAEA) has been an implementation body of the burial project of the radioactive wastes from research facilities. In this report, the characteristics of the wastes and the conceptional design of the JAEA burial facilities are introduced, and the current status of the study on the radioactivity concentrations corresponding to dose criterion for trench disposal and pit disposal is also presented.
