Enhancement of the methodology of repository design and post-closure performance assessment for preliminary investigation stage, 3; Progress report on NUMO-JAEA collaborative research in FY2013 (Joint research)

Shibata, Masahiro; Sawada, Atsushi; Tachi, Yukio; Makino, Hitoshi; Wakasugi, Keiichiro; Mitsui, Seiichiro; Kitamura, Akira; Yoshikawa, Hideki; Oda, Chie; Ishidera, Takamitsu; et al.

JAEA-Research 2014-030, 457 Pages, 2015/03

JAEA-Research-2014-030.pdf:199.23MB

JAEA and NUMO have conducted a collaborative research work which is designed to enhance the methodology of repository design and post-closure performance assessment in preliminary investigation stage. With regard to (1) study on rock suitability in terms of hydrology, based on some examples of developing method of hydro-geological structure model, acquired knowledge are arranged using the tree diagram, and model uncertainty and its influence on the evaluation items were discussed. With regard to (2) study on scenario development, the developed approach for "defining conditions" has been reevaluated and improved from practical viewpoints. In addition, the uncertainty evaluation for the effect of use of cementitious material, as well as glass dissolution model, was conducted with analytical evaluation. With regard to (3) study on setting radionuclide migration parameters, based on survey of precedent procedures, multiple-approach for distribution coefficient of rocks was established, and the adequacy of the approach was confirmed though its application to sedimentary rock and granitic rock. Besides, an approach for solubility setting was developed including the procedure of selection of solubility limiting solid phase. The adequacy of the approach was confirmed though its application to key radionuclides.

R&D supporting the technology for safe and practical HLW disposal in Japan

Seo, Toshihiro; Sasao, Eiji; Notoya, Shin; Shimizu, Kazuhiko

Proceedings of 16th Pacific Basin Nuclear Conference (PBNC-16) (CD-ROM), 6 Pages, 2008/10

JAEA has promoted research and development of HLW disposal technology to contribute to both implementation and safety regulation. This R&D covers the geological environment, repository engineering and performance assessment. At two underground laboratories (Mizunami and Horonobe), surface-based investigations have been completed, and the excavation of shafts and drifts is underway. A complementary study of natural disruptive phenomena, such as volcanism and faulting, has also been conducted. In the ENTRY and QUALITY research facilities, the development of engineering technologies with associated advanced models and databases for quantification of the long-term evolution of the near-field has been carried out. To integrate these R&D activities and manage the huge amount of data that they produce, JAEA has initiated a novel project to develop an advanced knowledge management system which will provide a technical knowledge base for supporting both implementers and regulators.

Basic approach to solute transport analysis utilizing information from surface-based investigations at two generic underground research laboratories

Maekawa, Keisuke; Sawada, Atsushi; Ota, Kunio; Kurikami, Hiroshi; Kunimaru, Takanori; Funaki, Hironori; Hama, Katsuhiro; Takeuchi, Shinji; Amano, Kenji; Saegusa, Hiromitsu; et al.

JAEA-Review 2007-011, 8 Pages, 2007/03

JAEA-Review-2007-011.pdf:0.66MB

In the current programme for research and development on the technical aspects of geological disposal, it is of significance to establish techniques for evaluating solute transport with a direct link to surface-based investigations through the processes of data interpretation, modelling and parameter designation within the immediate five years following the H17 Project. This report presents a basic approach to promoting multidisciplinary research activities involving field investigations and relevant solute transport analysis.

Study plan for performance assessment of potential effect of natural phenomena on a HLW disposal system, 5-year plan

Kawamura, Makoto; Oi, Takao; Makino, Hitoshi; Umeda, Koji; Niizato, Tadafumi; Yasue, Kenichi; Kawachi, Susumu; Ishimaru, Tsuneari; Seo, Toshihiro; Ebina, Takanori*; et al.

JAEA-Review 2006-039, 60 Pages, 2007/01

JAEA-Review-2006-039.pdf:7.39MB

This report is to outline a 5-year plan of research and development (R&D) for performance assessment of potential effect of natural phenomena on a geological disposal of high-level radioactive waste in JAEA. In each research plan, objectives based on the necessity and the significance of the research plan are clarified in the section of "Objectives and the past progresses", with summarizing the progresses of H12: Project to establish the scientific and technical basis for HLW disposal in Japan (Second Progress Report), and H17: Development and management of the technical knowledge base for the geological disposal of HLW (H17 report). In addition, next five year plan is described in the section.

Key R&D activities supporting disposal of radioactive waste; Responding to the challenges of the 21st century

Miyamoto, Yoichi; Umeki, Hiroyuki; Osawa, Hideaki; Naito, Morimasa; Nakano, Katsushi; Makino, Hitoshi; Shimizu, Kazuhiko; Seo, Toshihiro

Nuclear Engineering and Technology, 38(6), p.505 - 534, 2006/08

Ensuring sufficient supplies of clean, economic and acceptable energy is a critical global challenge for the 21st century. There seems little alternative to a greatly expanded role for nuclear power, but implementation of this option will depend on ensuring that all resulting wastes can be disposed of safely. Although there is a consensus on the fundamental feasibility of such disposal by experts in the field, concepts have to be developed to make them more practical to implement and, in particular, more acceptable to key stakeholders. By considering global trends and using illustrative examples from Japan, key areas for future R&D are identified and potential areas where the synergies of international collaboration would be beneficial are highlighted.

Study on evaluation method for potential effect of natural phenomena on a HLW disposal system

Kawamura, Makoto; Makino, Hitoshi; Umeda, Koji; Seo, Toshihiro; Ishimaru, Tsuneari; Osawa, Hideaki

Saikuru Kiko Giho, (28), p.53 - 64, 2005/09

https://rdreview.jaea.go.jp/gihou/pdf3/n28-07.pdf

Evaluation for potential effect of natural phenomena on a HLW disposal system is an important issue in safety assessment. A scenario construction method for the effects on a HLW disposal system condition and performance has been developed for two purposes, first one is effective elicitation and organization of information from investigators of natural phenomena and performance assessor, the other is maintenance of traceability of scenario construction processes with suitable records. In this method, a series of works to construct scenarios is divided into pieces to facilitate to elicit the features of potential effect of natural phenomena on a HLW disposal system and is organized to create reasonable scenarios with consistency, traceability and adequate conservativeness within realistic view.

Geochemical micro-behavior of natural U-series nuclides in granitic conglomerate from the Tono mine, central Japan

Kanai, Yutaka*; Okuyama, Yasuko*; Seo, Toshihiro; Sakamaki, Yukio*

Geochemical Journal, 32(6), p.351 - 366, 1998/12

https://doi.org/10.2343/geochemj.32.351

None

None

; ; Yoshida, Hidekazu; Todaka, Norifumi; ; Koide, Kaoru; Seo, Toshihiro

PNC TN7070 96-002, 20 Pages, 1996/11

PNC-TN7070-96-002.pdf:1.35MB

no abstracts in English

Study of colloids in groundwater at the Tono Uranium Deposit, Japan

Seo, Toshihiro

Migration '95, 0 Pages, 1995/00

None

Data compilation of geoscientific studies of Tono urnium deposits,central Japan

Yoshida, Hidekazu; Seo, Toshihiro; ; ; Hama, Katsuhiro; ; Iwatsuki, Teruki

PNC TN7410 94-015, 65 Pages, 1994/03

PNC-TN7410-94-015.pdf:7.63MB

Results to data of the geological, geochemical and hydrogeological studies in the To site has been prepared as an aid to discussion of the joint PNC/Nagra Tono AnaloguProject (TAP). It forms a outline of a geological, geochemical and hydrogeological sdies which have been conducted in the Tono site and includes an data which could be sessed by participants of the TAP. This catalogue has been compiled as a rather overl information which will act as a basis to evaluate the feasibility of the TAP.