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Totsuka, Masayoshi; Kurosawa, Ryohei*; Sakai, Akihiro; Nakata, Hisakazu; Hayashi, Hirokazu; Amazawa, Hiroya
JAEA-Technology 2017-001, 40 Pages, 2017/03
JAEA-Technology-2017-001.pdf:2.24MB
Japan Atomic Energy Agency is planning for the near surface disposal of low level radioactive wastes generated from research, industrial and medical facilities industry in Japan. This document provides the values of radioactivity concentrations equivalent to dose criterion for trench-type disposal. These values are derived based on the safety assessment for ground water scenarios by using a model which describes the release of radionuclides from wastes to a cover soil caused by elution. These concentrations are compared with the one calculated by a model that describes the nuclide release mechanisms as solid-liquid partitioning equilibrium. Additionally, the change in the concentrations is evaluated when the amount of water percolating into a disposal facility varies.
Sakai, Akihiro; Kurosawa, Ryohei*; Totsuka, Masayoshi; Nakata, Hisakazu; Amazawa, Hiroya
JAEA-Technology 2016-032, 117 Pages, 2017/02
JAEA-Technology-2016-032.pdf:12.84MB
JAEA has been planning to implement near surface disposal of low level waste generated from research, medical, and industrial facilities. JAEA plans to carry out 3d analysis of groundwater flow in geological model around the disposal site because of development of migration assessment modeling of radioactivity materials in the site. In the safety demonstration test in JAEA, 3d analysis of groundwater flow was carried out on 1999. The analysis was calculated by using the code "3D-SEEP". But it is necessary to improve the conditions of the model in the analysis. Therefore, we improved the geological model which had been developed carried out 3d analysis of groundwater flow by using the current 3D-SEEP for the specified disposal site in the future. From the result, we expect that 3d analysis of groundwater flow in the environment around the specified near surface disposal site will be able to be sufficiently conducted by developing an appropriate model for the disposal site.
Kusano, Tomohiro; Nohara, Tsuyoshi; Umeda, Koji; Ishimaru, Tsuneari; Hanamuro, Takahiro; Saito, Tatsuo; Yasue, Kenichi; Niwa, Masakazu; Shimada, Koji; Yamada, Kunimi; et al.
JAEA-Research 2009-022, 47 Pages, 2009/09
JAEA-Research-2009-022.pdf:48.94MB
The Japanese islands are located in the tectonically active Circum-Pacific Mobile Belt. As a result, Japan has a high frequency of earthquakes and eruptions. Special consideration is given to the long-term stability of the geological environment, taking into account volcanism, faulting, uplift, denudation, climatic change and sea-level change in Japan. Development of research/prediction technologies for geotectonic events has been carried out to evaluate the long-term stability of the geological environment in Japan. In fiscal year 2007, we carried out the following researches, to confirm existence of the phenomena that have influences on geological disposal system (e.g., active faulting, volcanism), and to develop the investigation techniques to reconstruct the history of these phenomena. For studies of faulting and seismic activity, we developed the investigation techniques to research distribution of crush zone, process of faulting, activity, and so on. For volcanological and geothermal studies, we developed a technique for detecting crustal magma and/or geothermal fluid in deep underground. For studies of uplift/denudation and climatic/sea-level changes, we extracted investigation techniques for landform developments and uplift rate with river terraces.
Umeda, Koji; Oi, Takao; Osawa, Hideaki; Oyama, Takuya; Oda, Chie; Kamei, Gento; Kuji, Masayoshi*; Kurosawa, Hideki; Kobayashi, Yasushi; Sasaki, Yasuo; et al.
JAEA-Review 2007-050, 82 Pages, 2007/12
JAEA-Review-2007-050.pdf:28.56MB
This report shows the annual report which shows the summarized results and topic outline of each project on geological disposal technology in the fiscal year of 2006.
Kurosawa, Masayoshi; Naito, Yoshitaka; Suyama, Kenya; ; Suzuki, Katsuo*;
Nihon Genshiryoku Gakkai-Shi, 40(6), p.486 - 494, 1998/00
Times Cited Count：0 Percentile：0.00(Nuclear Science & Technology)no abstracts in English
Kurosawa, Masayoshi; Naito, Yoshitaka; ;
JAERI-Data/Code 96-036, 156 Pages, 1997/02
JAERI-Data-Code-96-036.pdf:3.22MB
no abstracts in English
Naito, Yoshitaka; Suyama, Kenya; Masukawa, Fumihiro; Matsumoto, Kiyoshi; Kurosawa, Masayoshi;
JAERI-Data/Code 96-037, 70 Pages, 1996/12
JAERI-Data-Code-96-037.pdf:1.68MB
no abstracts in English
Naito, Yoshitaka; ; Kurosawa, Masayoshi; Suzaki, Takenori
Nuclear Technology, 110, p.40 - 52, 1995/04
Times Cited Count：3 Percentile：36.50(Nuclear Science & Technology)no abstracts in English
; ; ; Naito, Yoshitaka; Kurosawa, Masayoshi
JAERI-Research 95-033, 31 Pages, 1995/03
JAERI-Research-95-033.pdf:0.71MB
no abstracts in English
Suzaki, Takenori; Kurosawa, Masayoshi; Hirose, Hideyuki; Yamamoto, Toshihiro; Nakajima, Ken; ; ;
ICNC 95: 5th Int. Conf. on Nuclear Criticality Safety, Vol. I, 0, p.1B.11 - 1B.18, 1995/00
no abstracts in English
Kurosawa, Masayoshi; Naito, Yoshitaka;
ICNC 95: 5th Int. Conf. on Nuclear Criticality Safety, Vol. I, 0, p.2.11 - 2.15, 1995/00
no abstracts in English
Naito, Yoshitaka; Kurosawa, Masayoshi;
JAERI-M 94-034, 225 Pages, 1994/03
no abstracts in English
Komuro, Yuichi; Naito, Yoshitaka; Kurosawa, Masayoshi; ;
JAERI-M 94-018, 32 Pages, 1994/03
no abstracts in English
Naito, Yoshitaka; Kurosawa, Masayoshi;
JAERI-M 93-061, 225 Pages, 1993/03
no abstracts in English
Kurosawa, Masayoshi
JAERI-M 92-007, 56 Pages, 1992/02
no abstracts in English
Kurosawa, Masayoshi;
Japan-China Symp. on Research and Test Reactors, 16 Pages, 1988/00
no abstracts in English
Yasue, Kenichi; Tajikara, Masayoshi; Saegusa, Hiromitsu; Niwa, Masakazu; Kurosawa, Hideki; Kusano, Tomohiro
no journal, ,
The stability of geological environments is influenced by natural events such as uplift, denudation, and climate variation. It is important for the geological disposal of nuclear wastes to assess the stability of geological environments. The purpose of this study is to establish the comprehensive techniques and method to evaluate the effects of topographic and climatic variations on groundwater flow condition. For this purpose, we developed the following techniques. (1) Research techniques for paleo-topography and paleo-climate (2) Modeling and simulation techniques for landform development (3) Simulation techniques of groundwater flow in consideration of the time-variation of geological environment. In this presentation, we introduce briefly the some of research results.
Saegusa, Hiromitsu; Yasue, Kenichi; Mizuno, Takashi; Takeuchi, Ryuji; Tajikara, Masayoshi; Kurosawa, Hideki
no journal, ,
no abstracts in English
