Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Collaborative Laboratories for Advanced Decommissioning Science; Kyushu University*
JAEA-Review 2020-036, 176 Pages, 2021/01
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 FY2019. 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 FY2018, this report summarizes the research results of the "Research and Development of Transparent Materials for Radiation Shield Using Nanoparticles" conducted in FY2019. The present study aims to reduce radiation exposure of workers in debris retrieval/analysis and reduce deterioration of optical and electronic systems in remote cameras. For these purposes, we develop transparent radiation shield by making the shield materials into nanoparticles, and dispersing/solidifying them in epoxy resin. By making boride or heavy metal compounds into nanoparticles, we will also develop a radiation shield that shields both neutrons and gamma-rays, and also suppresses secondary gamma-rays produced from neutrons.
Collaborative Laboratories for Advanced Decommissioning Science; Kyushu University*
JAEA-Review 2019-039, 104 Pages, 2020/03
The Collaborative Laboratories for Advanced Decommissioning Science (CLADS), Japan Atomic Energy Agency (JAEA), had been conducting the Center of World Intelligence Project for Nuclear Science/Technology and Human Resource Development (hereafter referred to "the Project") in FY2018. The Project aims to contribute to solving problems in nuclear energy field represented by the decommissioning of the Fukushima Daiichi Nuclear Power Station, Tokyo Electric Power Company Holdings, Inc. 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 FY2018, this report summarizes the research results of the "Research and Development of Transparent Materials for Radiation Shield using Nanoparticles". The present study aims to reduce radiation exposure of workers in debris retrieval/analysis and reduce deterioration of optical and electronic systems in remote cameras. For these purposes, we develop transparent radiation shield by making the shield materials into nanoparticles, and dispersing/solidifying them in epoxy resin. By making BC and W into nanoparticles, we will also develop a radiation shield that shields both neutrons and gamma-rays, and also suppresses secondary gamma-rays produced from neutrons.
Idesaki, Akira; Uechi, Hiroki*; Hakura, Yoshihiko*; Kishi, Hajime*
JAEA-Review 2014-050, JAEA Takasaki Annual Report 2013, P. 29, 2015/03
Effects of gamma-ray irradiation on a cyanate ester/epoxy resin composed of dicyanate ester of bisphenol A (DCBA) and diglycidyl ether of bisphenol A (DGEBA) was investigated by changes in physicochemical properties such as gas evolution behavior, change in chemical structure, and so on, after the gamma-ray irradiation with dose of 100 MGy as maximum under vacuum. It was found that ether linkages are mainly decomposed by the gamma-ray irradiation with evolving gases of hydrogen, carbon dioxide and carbon monoxide and decreasing in glass transition temperature.
Nakamura, Hirofumi; Hayashi, Takumi; Kobayashi, Kazuhiro; Nishi, Masataka
Fusion Science and Technology, 48(1), p.452 - 455, 2005/07
Times Cited Count:2 Percentile:17.30(Nuclear Science & Technology)Tritium behavior released in ITER hot cell has been investigated numerically. Tritium behavior was evaluated by a combined analytical methods of a tritium transport analysis with the one dimensional diffusion model in the multi-layer wall (concrete and epoxy paint) and a tritium concentration analysis with the complete mixing model by the ventilation in the hot cell under the simulated hot cell operational conditions. As the results, tritium concentration in the hot cell volume decreases rapidly from 300 DAC (Derived Air Concentration) less than 1 DAC in several days after removing the tritium release source. Tritium inventory in the wall is estimated to be about 0.1 PBq for 20 years operation. On the other hand, Tritium permeation through the epoxy painted concrete wall will be negligible. Finally, as to the effect of epoxy paint on the tritium permeation and inventory, it is found that the epoxy paint can reduce tritium inventory by about two orders of magnitude relative to bare concrete wall.
J.T.Lindsay*; Matsubayashi, Masahito; M.N.Islam*
Fifth World Conf. on Neutron Radiography, 0, p.644 - 649, 1996/00
no abstracts in English
J.T.Lindsay*; Matsubayashi, Masahito; Md.N.Islam*
Nuclear Instruments and Methods in Physics Research A, 353, p.149 - 151, 1994/00
Times Cited Count:8 Percentile:63.55(Instruments & Instrumentation)no abstracts in English
JAERI-M 92-129, 40 Pages, 1992/09
no abstracts in English
Sugimoto, Makoto
JAERI-M 90-038, 49 Pages, 1990/03
no abstracts in English
; Hagiwara, Miyuki; Kawanishi, Shuichi; Sasuga, Tsuneo; ; ; ; Sonoda, Katsumi*; ; ; et al.
JAERI-M 85-220, 26 Pages, 1986/01
no abstracts in English
Nuclear Instruments and Methods in Physics Research A, 249, p.137 - 140, 1986/00
Times Cited Count:1 Percentile:41.01(Instruments & Instrumentation)no abstracts in English
; Seguchi, Tadao
EIM-85-155, p.19 - 30, 1985/00
no abstracts in English
; Kawanishi, Shuichi; Hagiwara, Miyuki
EIM-84-130, p.19 - 25, 1984/00
no abstracts in English
; M.A.Kirk*; R.C.Birtcher*; Hagiwara, Miyuki; Kawanishi, Shuichi
Nuclear Instruments and Methods in Physics Research B, B1, p.610 - 616, 1984/00
no abstracts in English
; M.A.Kirk*; R.C.Birtcher*; Hagiwara, Miyuki; Kawanishi, Shuichi
Journal of Nuclear Materials, 119(2-3), p.146 - 153, 1983/00
Times Cited Count:15 Percentile:81.45(Materials Science, Multidisciplinary)no abstracts in English