{"title":"Radiation Education at “Commutan Fukushima” - Unlocking the Future through Inquiry Learning","authors":"Kiyoshi Sasaki","doi":"10.3327/JAESJB.62.8_423","DOIUrl":"https://doi.org/10.3327/JAESJB.62.8_423","url":null,"abstract":"","PeriodicalId":8595,"journal":{"name":"Atomic Energy Society of Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81870872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
When excess pressure and temperature are added to a containment vessel of a nuclear power plant during a severe accident, damage of the containment vessel and the release of radioactive materials into the environment are expected. Filtered containment venting systems (FCVS) installed in exhaust systems reduce the release of radioactive materials by the use of multistage filters. In actual FCVS, several types of alkaline solution are used in the scrubbing stage to capture the radioactive iodine (I2). Therefore, it is difficult to remove CH3I by the alkaline solution, and molecular sieves such as silver zeolites installed downstream of the scrubbing stage are used to capture the organic iodide (CH3I). Silver nitrate aqueous solution (AgNO3 aq.) is highly reactive against iodine; hence, by using AgNO3 aq., the removal of organic iodide in the scrubbing stage can be expected. We have conducted basic evaluations of the removal properties of iodine and organic iodide by AgNO3 aq. using smallscale and pool-scrubbing (inner diameter: 300 mm) test sections at ambient temperature and pressure. The small-scale test results show that AgNO3 aq. has the same I2 removal performance as sodium hydroxide aqueous solution (NaOH aq.). Moreover, the pool-scrubbing test results show that a CH3I decontamination factor (DF) of over 50 can be expected under the conditions of a AgNO3 concentration ≥ 10 wt% and submergence ≥ 1.14 m.
{"title":"Evaluation of the Removal Properties of Iodine and Organic Iodide by a AgNO3 Solution","authors":"T. Kanai, M. Furuya, S. Nisimura","doi":"10.3327/taesj.j18.034","DOIUrl":"https://doi.org/10.3327/taesj.j18.034","url":null,"abstract":"When excess pressure and temperature are added to a containment vessel of a nuclear power plant during a severe accident, damage of the containment vessel and the release of radioactive materials into the environment are expected. Filtered containment venting systems (FCVS) installed in exhaust systems reduce the release of radioactive materials by the use of multistage filters. In actual FCVS, several types of alkaline solution are used in the scrubbing stage to capture the radioactive iodine (I2). Therefore, it is difficult to remove CH3I by the alkaline solution, and molecular sieves such as silver zeolites installed downstream of the scrubbing stage are used to capture the organic iodide (CH3I). Silver nitrate aqueous solution (AgNO3 aq.) is highly reactive against iodine; hence, by using AgNO3 aq., the removal of organic iodide in the scrubbing stage can be expected. We have conducted basic evaluations of the removal properties of iodine and organic iodide by AgNO3 aq. using smallscale and pool-scrubbing (inner diameter: 300 mm) test sections at ambient temperature and pressure. The small-scale test results show that AgNO3 aq. has the same I2 removal performance as sodium hydroxide aqueous solution (NaOH aq.). Moreover, the pool-scrubbing test results show that a CH3I decontamination factor (DF) of over 50 can be expected under the conditions of a AgNO3 concentration ≥ 10 wt% and submergence ≥ 1.14 m.","PeriodicalId":8595,"journal":{"name":"Atomic Energy Society of Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83927445","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Nuclear Policy Decision Making and Deliberative Democracy","authors":"R. Matsui","doi":"10.3327/taesj.j19.014","DOIUrl":"https://doi.org/10.3327/taesj.j19.014","url":null,"abstract":"","PeriodicalId":8595,"journal":{"name":"Atomic Energy Society of Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85570906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Shoichiro OKITA, Seiji TASAKI and Yutaka ABE Sector of Fast Reactor and Advanced Reactor Research and Development, Japan Atomic Energy Agency, 4002 Narita-cho, Oarai-machi, Higashiibaraki-gun, Ibaraki 311-1393, Japan Department of Nuclear Engineering, Graduate School of Engineering, Kyoto University, Kyotodaigaku-Katsura, Nishikyo-ku, Kyoto 615-8540, Japan (Received March 12, 2020; accepted in revised form April 8, 2020; published online July 21, 2020)
{"title":"Neutronic Design of Neutron Moderator on a Reentrant-hole Configuration for Kyoto University Accelerator-based Neutron Source (KUANS)","authors":"Shoichiro Okita, S. Tasaki, Yutaka Abe","doi":"10.3327/taesj.j19.028","DOIUrl":"https://doi.org/10.3327/taesj.j19.028","url":null,"abstract":"Shoichiro OKITA, Seiji TASAKI and Yutaka ABE Sector of Fast Reactor and Advanced Reactor Research and Development, Japan Atomic Energy Agency, 4002 Narita-cho, Oarai-machi, Higashiibaraki-gun, Ibaraki 311-1393, Japan Department of Nuclear Engineering, Graduate School of Engineering, Kyoto University, Kyotodaigaku-Katsura, Nishikyo-ku, Kyoto 615-8540, Japan (Received March 12, 2020; accepted in revised form April 8, 2020; published online July 21, 2020)","PeriodicalId":8595,"journal":{"name":"Atomic Energy Society of Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82212336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Koichi NAKAMURA, Sunghyon JANG and Akira YAMAGUCHI Nuclear Technology Research Laboratory, Central Research Institute of Electric Power Industry, 2–6–1 Nagasaka, Yokosuka-shi, Kanagawa 240–196, Japan Department of Nuclear Engineering and Management School of Engineering, The University of Tokyo, 7–3–1 Hongo, Bunkyo-ku, Tokyo 113–8656, Japan (Received December 10, 2018; accepted in revised form August 9, 2019; published online January 24, 2020)
{"title":"Development of Source Term Evaluation Method Applicable to Dynamic PRA","authors":"Koichi Nakamura, Sunghyon Jang, A. Yamaguchi","doi":"10.3327/taesj.j18.039","DOIUrl":"https://doi.org/10.3327/taesj.j18.039","url":null,"abstract":"Koichi NAKAMURA, Sunghyon JANG and Akira YAMAGUCHI Nuclear Technology Research Laboratory, Central Research Institute of Electric Power Industry, 2–6–1 Nagasaka, Yokosuka-shi, Kanagawa 240–196, Japan Department of Nuclear Engineering and Management School of Engineering, The University of Tokyo, 7–3–1 Hongo, Bunkyo-ku, Tokyo 113–8656, Japan (Received December 10, 2018; accepted in revised form August 9, 2019; published online January 24, 2020)","PeriodicalId":8595,"journal":{"name":"Atomic Energy Society of Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79534616","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Miyuki AKIBA, Akitoshi HOTTA, Yutaka ABE and Haomin SUN Regulatory Standard and Research Department, Secretariat of Nuclear Regulation Authority, 1–9–9 Roppoingi, Minato-ku, Tokyo 106–8450, Japan Department of Engineering Mechanics & Energy, University of Tsukuba, 1–1–1 Tennodai, Tukuba-shi Ibaraki 305–8573, Japan Nuclear Safety Research Center, Japan Atomic Energy Agency, 2–4 Shirakata, Tokai-mura, Naka-gun, Ibaraki 319–1195, Japan (Received January 22, 2019; accepted in revised form July 10, 2019; published online January 24, 2020)
{"title":"Experimental Research on Pool Scrubbing of Particles of Radioactive Materials","authors":"Miyuki Akiba, Akitoshi Hotta, Y. Abe, Haomin Sun","doi":"10.3327/taesj.j18.042","DOIUrl":"https://doi.org/10.3327/taesj.j18.042","url":null,"abstract":"Miyuki AKIBA, Akitoshi HOTTA, Yutaka ABE and Haomin SUN Regulatory Standard and Research Department, Secretariat of Nuclear Regulation Authority, 1–9–9 Roppoingi, Minato-ku, Tokyo 106–8450, Japan Department of Engineering Mechanics & Energy, University of Tsukuba, 1–1–1 Tennodai, Tukuba-shi Ibaraki 305–8573, Japan Nuclear Safety Research Center, Japan Atomic Energy Agency, 2–4 Shirakata, Tokai-mura, Naka-gun, Ibaraki 319–1195, Japan (Received January 22, 2019; accepted in revised form July 10, 2019; published online January 24, 2020)","PeriodicalId":8595,"journal":{"name":"Atomic Energy Society of Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79666300","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Efforts at Ohi Power Station (KEPCO) for Introduction of Nuclear Regulation Inspection","authors":"S. Masumoto","doi":"10.3327/jaesjb.62.4_208","DOIUrl":"https://doi.org/10.3327/jaesjb.62.4_208","url":null,"abstract":"","PeriodicalId":8595,"journal":{"name":"Atomic Energy Society of Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90714984","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Remote technology for decommissioning of Fukushima Daiichi Nuclear Power Station","authors":"H. Asama","doi":"10.3327/jaesjb.62.3_125","DOIUrl":"https://doi.org/10.3327/jaesjb.62.3_125","url":null,"abstract":"","PeriodicalId":8595,"journal":{"name":"Atomic Energy Society of Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77358319","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Present status of Fukushima Daiichi unclear power plant decommissioning","authors":"S. Onitsuka","doi":"10.3327/jaesjb.62.3_121","DOIUrl":"https://doi.org/10.3327/jaesjb.62.3_121","url":null,"abstract":"","PeriodicalId":8595,"journal":{"name":"Atomic Energy Society of Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78087098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Research and Development at Underground Research Laboratories by RWMC","authors":"Masato Kobayashi","doi":"10.3327/jaesjb.62.4_191","DOIUrl":"https://doi.org/10.3327/jaesjb.62.4_191","url":null,"abstract":"","PeriodicalId":8595,"journal":{"name":"Atomic Energy Society of Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79048824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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