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JAEA Reports

Evaluation of nuclides migration for trench-type disposal by a calculation method taking leaching into consideration

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.

JAEA Reports

Preliminary 3-dimensional analysis of groundwater flow in the surrounding environment of near surface disposal facility

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.

JAEA Reports

Annual report for research on long-term stability of geological environments in FY2007

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.

JAEA Reports

Development and management of the knowledge base for the geological disposal technology; Annual report 2006

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.

Journal Articles

Effect of long-term storage of LWR spent fuel on Pu-thermal fuel cycle

Kurosawa, Masayoshi; Naito, Yoshitaka; Suyama, Kenya; *; Suzuki, Katsuo*; *

Nihon Genshiryoku Gakkai-Shi, 40(6), p.486 - 494, 1998/00

 Times Cited Count:0 Percentile:0.01(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

The Isotopic compositions database system on spent fuels in light water reactors (SFCOMPO)

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

JAEA Reports

Burnup code for fuel assembly by Monte Carlo code; MKENO-BURN

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

Journal Articles

Study on the criticality safety evaluation method for burnup credit in JAERI

Naito, Yoshitaka; ; Kurosawa, Masayoshi; Suzaki, Takenori

Nuclear Technology, 110, p.40 - 52, 1995/04

 Times Cited Count:3 Percentile:37.69(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Journal Articles

Exponential experiments of PWR spent fuel assemblies for acquiring subcriticality benchmarks usable in burnup credit evaluations

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

Journal Articles

Isotopic composition of spent fuels for criticality safety evaluation and isotopic composition database (SFCOMPO)

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

JAEA Reports

Data book of the isotopic composition of spent fuel in light water reactors

Naito, Yoshitaka; Kurosawa, Masayoshi; *

JAERI-M 94-034, 225 Pages, 1994/03

JAERI-M-94-034.pdf:5.59MB

no abstracts in English

JAEA Reports

Estimation of critical mass of burned-up fuel

Komuro, Yuichi; Naito, Yoshitaka; Kurosawa, Masayoshi; *; *

JAERI-M 94-018, 32 Pages, 1994/03

JAERI-M-94-018.pdf:0.95MB

no abstracts in English

JAEA Reports

Databook of the isotopic composition of spent fuel in light water reactors

Naito, Yoshitaka; Kurosawa, Masayoshi; *

JAERI-M 93-061, 225 Pages, 1993/03

JAERI-M-93-061.pdf:5.45MB

no abstracts in English

JAEA Reports

A Plotting system for three-dimensional oblique coordinates(triangular mesh) of CITATION

Kurosawa, Masayoshi

JAERI-M 92-007, 56 Pages, 1992/02

JAERI-M-92-007.pdf:1.86MB

no abstracts in English

Journal Articles

Burn-up calculation and evaluation on cadmium absorber of the JRR-2 control rod

Kurosawa, Masayoshi;

Japan-China Symp. on Research and Test Reactors, 16 Pages, 1988/00

no abstracts in English

Oral presentation

Study on topographic and climatic variations concerning long-term stability of geological environment; A Case study on an inland area in Japan

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.

Oral presentation

Study for evaluation of the influence of long-term topographic and climatic changes on groundwater flow conditions

Saegusa, Hiromitsu; Yasue, Kenichi; Mizuno, Takashi; Takeuchi, Ryuji; Tajikara, Masayoshi; Kurosawa, Hideki

no journal, , 

no abstracts in English

18 (Records 1-18 displayed on this page)
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