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Yamanaka, Kenta*; Kuroda, Asumi*; Ito, Miyu*; Mori, Manami*; Bian, H.*; Shobu, Takahisa; Sato, Shigeo*; Chiba, Akihiko*
Additive Manufacturing, 37, p.101678_1 - 101678_12, 2021/01
Times Cited Count：23 Percentile：86.72(Engineering, Manufacturing)Ando, Masaki; Sasaki, Miyuki; Saito, Kimiaki
Journal of Nuclear Science and Technology, 57(12), p.1319 - 1330, 2020/12
Times Cited Count：4 Percentile：45.45(Nuclear Science & Technology)Air dose rates measured by car-borne surveys within 80 km range of Fukushima Dai-ichi Nuclear Power Plant using KURAMA systems from 2011 up to 2018 were analyzed, and decreasing trends and ecological half-life were evaluated. The decreasing speed of air dose rates became 0.08 over a period of seven years, indicating a much more rapid decrease than estimated by the physical decay of radiocesium (0.3). The fast components of the ecological half-lives evaluated in entire the evacuation order area were about 2 to 3 y, and were considerably larger than those outside the evacuation order area (0.4 to 0.5 y). To model the acceleration in the decrease of air dose rates observed in evacuation order areas, we modified the bi-exponential curve formula of ecological half-life and introduced the two-group model. The fast decreasing components of the ecological half-life evaluated using the two-group model after 2013 were 0.5 to 1 y, and were much shorter than those up to 2013, at 2 to 3 y.
Narita, Hirokazu*; Nicolson, R. M.*; Motokawa, Ryuhei; Ito, Fumiyuki*; Morisaku, Kazuko*; Goto, Midori*; Tanaka, Mikiya*; Heller, W. T.*; Shiwaku, Hideaki; Yaita, Tsuyoshi; et al.
Inorganic Chemistry, 58(13), p.8720 - 8734, 2019/07
Times Cited Count：14 Percentile：69.69(Chemistry, Inorganic & Nuclear)Yatsuka, Eiichi; Hatae, Takaki; Suito, Satoshi*; Ohara, Miyuki*; Hagita, Koji*; Inoue, Kazunori*; Bassan, M.*; Walsh, M.*; Itami, Kiyoshi
Journal of Instrumentation (Internet), 11(1), p.C01006_1 - C01006_12, 2016/01
Times Cited Count：6 Percentile：31.03(Instruments & Instrumentation)Fujita, Tomoo; Tanai, Kenji; Nakayama, Masashi; Sawada, Sumiyuki*; Asano, Hidekazu*; Saito, Masahiko*; Yoshino, Osamu*; Kobayashi, Masato*
JAEA-Research 2014-031, 44 Pages, 2015/03
JAEA-Research-2014-031.pdf:16.11MB
Japan Atomic Energy Agency (JAEA) and Radioactive Waste Management Funding and Research Center (RWMC) concluded the letter of cooperation agreement on the research and development of radioactive waste disposal in April, 2005, and have been carrying out the collaboration work based on the agreement. JAEA have been carrying out the Horonobe Underground Research Laboratory (URL) Project which is intended for a sedimentary rock in the Horonobe town, Hokkaido, since 2001. In the project, geoscientific research and research and development on geological disposal technology are being promoted. Meanwhile, the government (the Agency for Natural Resources and Energy, Ministry of Economy, Trade and Industry) has been promoting construction of equipments for the full-scale demonstration of engineered barrier system (EBS) and operation technology for high-level radioactive waste (HLW) disposal since 2008, to enhance public's understanding to the geological disposal of HLW, e.g. using underground facility. RWMC received an order of the project in fiscal year 2012 (2011/2012) continuing since fiscal year 2008 (2008/2009). Since topics in this project are included in the Horonobe URL Project, JAEA carried out this project as collaboration work continuing since fiscal year 2008. This report summarizes the results of engineering technology carried out in this collaboration work in fiscal year 2013. In fiscal year 2013, emplacement tests using buffer material block for the vertical emplacement concept were carried out and visualization tests for water penetration in buffer material were carried out.
Nakatsuka, Noboru; Sato, Haruo; Tanai, Kenji; Nakayama, Masashi; Sawada, Sumiyuki*; Asano, Hidekazu*; Saito, Masahiko*; Yoshino, Osamu*; Tsukahara, Shigeki*; Hishioka, Sosuke*; et al.
JAEA-Research 2013-034, 70 Pages, 2014/01
JAEA-Research-2013-034.pdf:9.11MB
Japan Atomic Energy Agency (JAEA) and Radioactive Waste Management Funding and Research Center (RWMC) concluded the letter of cooperation agreement on the research and development of radioactive waste disposal in April, 2005, and have been carrying out the collaboration work based on the agreement. JAEA have been carrying out the Horonobe Underground Research Laboratory (URL) Project which is intended for a sedimentary rock in the Horonobe town, Hokkaido, since 2001. In the project, geoscientific research and research and development on geological disposal technology are being promoted. Meanwhile, the government (the Agency for Natural Resources and Energy, Ministry of Economy, Trade and Industry) has been promoting construction of equipments for the full-scale demonstration of engineered barrier system and operation technology for high-level radioactive waste (HLW) disposal since 2008, to enhance public's understanding to the geological disposal of HLW, e.g. using underground facility. RWMC received an order of the project in fiscal year 2012 (2011/2012) continuing since fiscal year 2008 (2008/2009). Since topics in this project are included in the Horonobe URL Project, JAEA carried out this project as collaboration work continuing in fiscal year 2008. This report summarizes the results of engineering technology carried out in this collaboration work in fiscal year 2012. In fiscal year 2012, part of the equipments for emplacement of buffer material was produced and visualization test for water penetration in buffer material were carried out.
Nakatsuka, Noboru; Sato, Haruo; Tanai, Kenji; Sugita, Yutaka; Nakayama, Masashi; Sawada, Sumiyuki*; Niinuma, Hiroaki*; Asano, Hidekazu*; Saito, Masahiko*; Yoshino, Osamu*; et al.
JAEA-Research 2013-027, 34 Pages, 2013/11
JAEA-Research-2013-027.pdf:5.84MB
Japan Atomic Energy Agency (JAEA) and Radioactive Waste Management Funding and Research Center (RWMC) concluded the letter of cooperation agreement on the research and development of radioactive waste disposal in April, 2005, and have been carrying out the collaboration work based on the agreement. JAEA have been carrying out the Horonobe Underground Research Laboratory (URL) Project which is intended for a sedimentary rock in the Horonobe town, Hokkaido, since 2001. In the project, geoscientific research and research and development on geological disposal technology are being promoted. Meanwhile, the government (the Agency for Natural Resources and Energy, Ministry of Economy, Trade and Industry) has been promoting construction of equipments for the full-scale demonstration of engineered barrier system and operation technology for high-level radioactive waste (HLW) disposal since 2008, to enhance public's understanding to the geological disposal of HLW, e.g. using underground facility. RWMC received an order of the project in fiscal year 2010 (2010/2011) continuing since fiscal year 2008 (2008/2009). Since topics in this project are included in the Horonobe URL Project, JAEA carried out this project as collaboration work continuing in fiscal year 2008. This report summarizes the results of engineering technology carried out in this collaboration work in fiscal year 2011. In fiscal year 2011, part of the equipments for emplacement of buffer material was produced and visualization test for water penetration in buffer material were carried out.
Matsuura, Hideharu*; Minohara, Nobumasa*; Inagawa, Yusuke*; Takahashi, Miyuki*; Oshima, Takeshi; Ito, Hisayoshi
Materials Science Forum, 556-557, p.379 - 382, 2007/00
no abstracts in English
Matsuura, Hideharu*; Minohara, Nobumasa*; Takahashi, Miyuki*; Oshima, Takeshi; Ito, Hisayoshi
Proceedings of 7th International Workshop on Radiation Effects on Semiconductor Devices for Space Application (RASEDA-7), p.181 - 184, 2006/10
no abstracts in English
Ichiyasu, Kenji; Ueda, Noritaka*; Ito, Takahisa*; Nakadate, Fumiyuki*; Yamakoshi, Chizuru*
JAEA-Research 2006-041, 71 Pages, 2006/06
JAEA-Research-2006-041.pdf:10.97MB
Since a development scale of Horonobe Underground Research Project is small, this research would permit under the Environmental Impact Assessment Low and the Basic Environment Ordinance of Hokkaido Prefecture. However, because of consideration of recent general social trends, environmental monitoring research was carried out to know this influence. Noise and vibration measurement was conducted at four points around the research area. Water quality measurement was conducted at two points. Fisheries research was conducted throughout the river. Plant community research according to the Blaun-Blanquet technique (1964) was conducted at two points in the area where rectangular divisions (quadrate) were set. And also, growing condition survey on Hai-dojoh-tsunagi was conducted. This Hai-dojoh-tsunagi is regarded as endangered species in Hokkaido, had been transplanted as an environment protection measure in 2003. In addition, the research places and the methods were made to be the same as that of the past (2004 and 2005) researches. From these results, the influence on the environment after construction and the progress after conduction of measure for protecting environment were checked. Consequently, the influence of construction was not found at present time. Therefore the measure was judged enough to protect environment. After this construction, the environmental monitoring research should be carrying out to check the influence and it would be necessary to conduct the quick and suitable measure to avoid or mitigate the influence.
Ueda, Noritaka*; Ito, Takahisa*; Nakadate, Fumiyuki*; Fujita, Rei*
JNC TJ5420 2004-006, 64 Pages, 2005/03
JNC-TJ5420-2004-006.pdf:10.73MB
Since a development scale of Horonobe Deep Underground Research is small, this research would permit under the Environmental Impact Assessment Low and the Basic Environment Ordinance of Hokkaido Prefecture. However, because of consideration of recent general social trends, environmental monitoring research was carried out to know this influence.Noise and vibration measurement was conducted at four points around the research area. Water quality measurement was conducted at two points (upper and lower region of Shimizusawa river flowing through the area). Fisheries research was conducted throughout the river and resulted in finding 8 species (including 6 species regarded as endangered). Plant community research according to the Blaun-Blanquet technique (1964) was conducted at two points in the area where rectangular divisions (quadrate) were set.And also, growing condition survey on Hai-dozyoh-tsunagi (Torreyochloa viridis) was conducted. This Hai-dozyoh-tsunagi is regarded as endangered species in Hokkaido, had been transplanted as an environment protection measure in 2003. From these results, the influence on the environment after construction and the progress after conduction of measure for protecting environment were checked. Consequently, the influence of construction was not found at present time. Therefore the measure was judged enough to protect environment.After this construction, the environmental monitoring research should be carrying out to check the influence and it would be necessary to conduct the quick and suitable measure to avoid or mitigate the influence.
Ueda, Noritaka*; Yoneda, Yutaka*; Nakadate, Fumiyuki*; Ito, Takahisa*; Murakami, Tomoko*
JNC TJ5420 2003-001, 120 Pages, 2004/03
Hamajima, Takataro*; Shimada, Mamoru*; Ono, Michitaka*; Takigami, Hiroyuki*; Hanai, Satoshi*; Wachi, Yoshihiro*; Takahashi, Yoshikazu; Matsui, Kunihiro; Ito, Toshinobu*; Isono, Takaaki; et al.
Teion Kogaku, 33(7), p.492 - 499, 1998/00
no abstracts in English
; Ito, Hiroshi; ; Katakai, Akio; Hagiwara, Miyuki; Araki, Kunio
JAERI-M 8183, 87 Pages, 1979/03
no abstracts in English
