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Journal Articles

Public acceptance as a driver for repository design

McKinley, I. G.*; Masuda, Sumio*; Hardie, S. M. L.*; Umeki, Hiroyuki*; Naito, Morimasa; Takase, Hiroyasu*

Journal of Energy, 2018, p.7546158_1 - 7546158_8, 2018/07

The Japanese geological disposal programme for radioactive waste is based on a volunteering approach to siting, which places particular emphasis on the need for public acceptance. This emphasises the development of a repository project as a partnership with local communities and involves stakeholders in important decisions associated with key milestones in the selection of repository sites and subsequent construction, operation and closure. To date, however, repository concept development has proceeded in a more traditional manner, focusing particularly on ease of developing a post-closure safety case. In the current project, we have attempted to go further by assessing what requirements stakeholders would place on a repository and assessing how these could be used to re-think repository designs so that they meet the desires of the public without compromising critical operational or long-term safety.

Journal Articles

Development of a method of safety assessment for geological disposal considering long-term evolution of geological and topographical environment by uplift and erosion

Wakasugi, Keiichiro; Yamaguchi, Masaaki; Koo, Shigeru*; Nagao, Fumiya; Kato, Tomoko; Suzuki, Yuji*; Ebashi, Takeshi; Umeki, Hiroyuki*; Niibori, Yuichi*

Nihon Genshiryoku Gakkai Wabun Rombunshi, 16(1), p.15 - 33, 2017/03

This study provides a method of safety assessment for the geological disposal of HLW to evaluate the effects of uplift and erosion which are widespread phenomena identified on regional and global scales, and are more or less difficult to avoid in Japan. This method enables to deal with different uplift rate and erosion rate, and to evaluate repository depth, the time required for a repository to reach the weathered zone and surface of the ground, and the number of waste packages eroded as a function of time by using a landform evolution model. Based on trial analysis, the result shows that the maximum dose in the Base Case (uplift rate: 0.3 mm/y) is less than the targeted criterion suggested by the international organization even if the repository reaches the ground surface. Furthermore, the diversifying effect on timing the waste packages to reach to weathered zone due to heterogeneity on altitude of bottom of weathered zone reduces one order magnitude of result of the existed dose assessment. The new method is applicable to evaluate safety of geological disposal based on realistic phenomena of uplift and erosion and to quantify a safety margin and robustness of the disposal system.

Journal Articles

Symposium on "Science of nuclear fuel cycle and backend; Research and education" with a memory of Professor Joonhong Ahn, the University of California, Berkeley

Nakayama, Shinichi; Okumura, Masahiko*; Nagasaki, Shinya*; Enokida, Yoichi*; Umeki, Hiroyuki*; Takase, Hiroyasu*; Kawasaki, Daisuke*; Hasegawa, Shuichi*; Furuta, Kazuo*

Genshiryoku Bakkuendo Kenkyu (CD-ROM), 23(2), p.131 - 148, 2016/12

A symposium "Science of nuclear fuel cycle and backend - Research and education -" was held at the Univer-sity of Tokyo in June 25, 2016. This aimed at developing the research on nuclear fuel cycle and backend. The time and the number of participants of the symposium were limited, but the active discussion was conducted, and the common perception for the future was shared among the experienced participants in those fields. This paper provides the discussions made in the symposium, and also, as a memory to Professor Ahn, the University of California, Berkeley, his prominent achievements in academic research and education.

Journal Articles

Progress in the geological disposal program in Japan

Deguchi, Akira*; Umeki, Hiroyuki*; Ueda, Hiroyoshi*; Miyamoto, Yoichi; Shibata, Masahiro; Naito, Morimasa; Tanaka, Toshihiko*

LBNL-1006984 (Internet), p.12_1 - 12_22, 2016/12

The H12 report demonstrated the feasibility of safe and technically reliable geological disposal in 1999. The Government of Japan re-evaluated the geological disposal program in terms of technical feasibility based on state-of-the-art geosciences and implementation process, because more than 10 years have passed from H12 and the Great Earthquake and nuclear accident have increased public concern regarding nuclear issues and natural hazards to cause accidents at nuclear facilities. Following the re-evaluation, the Government concluded further to promote geological disposal program, and thus the Basic Policy for Final Disposal was revised in 2015 including a new approach to siting process with identification of "Scientifically Preferable Areas". NUMO and relevant research organizations such as JAEA have been carrying out R and D activities to increase technical reliability for geological disposal. NUMO has started to develop a generic safety case.

Journal Articles

Current status of research and development at Japan Atomic Energy Agency

Tajima, Yasuhide; Miura, Yukitoshi; Umeki, Hiroyuki

Denki Hyoron, 97(2), p.66 - 85, 2012/02

no abstracts in English

Journal Articles

A Challenge on development of an advanced Knowledge Management System (KMS) for radioactive waste disposal; Moving from theory to practice

Makino, Hitoshi; Hioki, Kazumasa; Osawa, Hideaki; Semba, Takeshi; Umeki, Hiroyuki

New Research on Knowledge Management Technology, p.165 - 184, 2012/02

The paper will review progress to date of a challenge on development of an advanced Knowledge Management System (KMS) for radioactive waste disposal by JAEA, with emphasis on tailoring of existing knowledge engineering tools and methods to radioactive waste management requirements, and outline future developments and challenges.

Journal Articles

Geological disposal:KM challenges and solutions

Umeki, Hiroyuki; Takase, Hiroyasu*; McKinley, I. G.*

Knowledge Management Research & Practice, 9(3), p.236 - 244, 2011/09

Journal Articles

A Vision of next generation performance assessment models

Makino, Hitoshi; Umeki, Hiroyuki; Takase, Hiroyasu*; McKinley, I. G.*

Proceedings of 2011 International High-Level Radioactive Waste Management Conference (IHLRWMC 2011) (CD-ROM), p.25 - 31, 2011/04

In the Japanese deep geological disposal programme, the goals of applications of performance assessments (PA) have changed considerably from original generic feasibility demonstrations to site-specific comparison of options that may result from the current call for volunteer communities to host a repository. PA will play a key role to support highly sensitive decisions at main milestones, particular associated with ranking different site and design options. The paper will discuss requirements for next generation PA to play the role and associated R&D needs.

JAEA Reports

CoolRep H22; Synthesis report on R&D results on geological disposal up to 2009

Umeki, Hiroyuki; Hioki, Kazumasa; Osawa, Hideaki; Fujita, Tomo; Shibata, Masahiro; Makino, Hitoshi; Iwatsuki, Teruki; Takeuchi, Shinji; Ishimaru, Tsuneari

JAEA-Review 2010-073, 255 Pages, 2011/02


The Japan Atomic Energy Agency (JAEA) has been performing research and development on geological disposal technology of high level radioactive waste. At the end of fiscal year 2009, the Geological Isolation Research and Development Directorate of JAEA made publicly available the "CoolRep H22", which is a web-based report that summarizes the R&D results, on its website. This document reports the contents of CoolRep H22.

Journal Articles

Common platform for communication among stakeholders using argumentation model for safety

Osawa, Hideaki; Hioki, Kazumasa; Makino, Hitoshi; Semba, Takeshi; Umeki, Hiroyuki; Takase, Hiroyasu*

Kenkyu, Gijutsu Keikaku Gakkai Dai-25-Kai Nenji Gakujutsu Taikai Oyobi Sokai Koen Yoshishu (CD-ROM), p.55 - 60, 2010/10

This paper describes new concept of common platform for communication among stakeholders using argumentation model for safety on geological disposal.

Journal Articles

Application of knowledge management systems for safe geological disposal of radioactive waste

Umeki, Hiroyuki; Takase, Hiroyasu*

Geological Repository systems for Safe Disposal of Spent Nuclear Fuels and Radioactive Waste, p.610 - 638, 2010/07

JAEA Reports

Information basis for developing comprehensive waste management system; US-Japan Joint Nuclear Energy Action Plan Waste Management Working Group Phase I report (Joint research)

Yui, Mikazu; Ishikawa, Hirohisa; Watanabe, Atsuo*; Yoshino, Kyoji*; Umeki, Hiroyuki; Hioki, Kazumasa; Naito, Morimasa; Seo, Toshihiro; Makino, Hitoshi; Oda, Chie; et al.

JAEA-Research 2010-015, 106 Pages, 2010/05


This report summarizes the activity of Phase I of Waste Management Working Group of the United States - Japan Joint Nuclear Energy Action Plan started in 2007. The working group focused on consolidation of the existing technical basis between the U.S. and Japan and the joint development of a plan for future collaborative activities. Firstly, the political/regulatory frameworks related to nuclear fuel cycles in both countries were reviewed. The various advanced fuel cycle scenarios in both countries were surveyed and summarized. Secondly, the waste management/disposal system optimization was discussed. Repository system concepts for the various classifications of nuclear waste were reviewed and summarized, then disposal system optimization processes and techniques were reviewed, and factors to consider in future repository design optimization activities were also discussed. Finally the potential collaboration areas and activities related to the optimization problem were extracted.

Journal Articles

Use of the safety case to focus KMS application

Osawa, Hideaki; Hioki, Kazumasa; Umeki, Hiroyuki; Takase, Hiroyasu*; McKinley, I. G.*

Proceedings of 12th International Conference on Environmental Remediation and Radioactive Waste Management (ICEM '09/DECOM '09) (CD-ROM), 5 Pages, 2009/10

The paper will review progress to date in this work with illustrative examples of argumentation networks. An outline of future developments and challenges will also be provided, for example considering how confidence in arguments can be assessed, the weakest links in argumentation chains can be identified, arguments can be developed interactively at a level appropriate to all users, etc. Two companion papers demonstrate how these can be applied to critical areas of a repository programme, performance assessment and "geosynthesis". The link to the safety case forms a basis for decision making in the inevitable cases where conflicts between programme requirements arise. The long-term evolution of the safety case also forms a pathway for focusing the future challenges described in the final paper in this set.

Journal Articles

Practical application of the KMS, 1; Total system performance assessment

Makino, Hitoshi; Hioki, Kazumasa; Umeki, Hiroyuki; Yang, H.*; Takase, Hiroyasu*; McKinley, I. G.*

Proceedings of 12th International Conference on Environmental Remediation and Radioactive Waste Management (ICEM '09/DECOM '09) (CD-ROM), 8 Pages, 2009/10

This paper will outline the reformulation of PA as a Knowledge Management (KM) task, discuss application of knowledge management technologies to PA tasks, and illustrate how these can be handled electronically in a "Performance assessment All-In-one Report System (PAIRS)" utilising hyperlinks and embedded tools to minimise duplication of material, ease Quality Assurance (QA) and facilitate the regular updating required in the Japanese programme.

Journal Articles

Challenges for the JAEA KMS; Fostering inventive design and problem solving

Makino, Hitoshi; Hioki, Kazumasa; Umeki, Hiroyuki; Tachibana, Shoko*; Takase, Hiroyasu*; McKinley, I. G.*

Proceedings of 12th International Conference on Environmental Remediation and Radioactive Waste Management (ICEM '09/DECOM '09) (CD-ROM), 9 Pages, 2009/10

The JAEA Knowledge Management System (KMS) is being developed to be flexible and able to respond to potential changes of boundary conditions. On a shorter timescale, the KMS must encourage flexibility in the methodology used for carrying out and presenting performance assessments. This is closely linked to development of advanced repository concepts; considering the requirements for a safe and practical repository tailored to specific site conditions, which reflects evolving technology. These coupled development tasks were, in the past, carried out by expert teams in a rather informal manner. As the technical challenges increase - and the need for transparency is accepted - a more formal method of developing innovative design solutions is needed. A knowledge engineering approach (TRIZ) that is used in other financial and industrial applications has thus been tested for its usefulness for such tasks.

Journal Articles

Overview of the JAEA knowledge management system supporting implementation and regulation of geological disposal in Japan

Umeki, Hiroyuki; Hioki, Kazumasa; Takase, Hiroyasu*; McKinley, I. G.*

Proceedings of 12th International Conference on Environmental Remediation and Radioactive Waste Management (ICEM '09/DECOM '09) (CD-ROM), 6 Pages, 2009/10

no abstracts in English

Journal Articles

Holistic assessment to put mobile radionuclides in perspective

Umeki, Hiroyuki

Proceedings of International Workshop on Mobile Fission and Activation Products in Nuclear Waste Disposal, p.11 - 20, 2009/05

no abstracts in English

Journal Articles

Development of next-generation technology for integrated site characterization of deep geological repositories

Osawa, Hideaki; Umeki, Hiroyuki; Ota, Kunio; Hama, Katsuhiro; Sawada, Atsushi; Takeuchi, Shinji; Semba, Takeshi; Takase, Hiroyasu*; McKinley, I. G.*

Proceedings of International Waste Management Symposium 2009 (WM '09) (CD-ROM), 11 Pages, 2009/03

The focus of this paper is development of advanced technology from the field of Knowledge engineering, termed the Information Synthesis and Interpretation System (ISIS), which incorporates past experience and know-how currently being obtained in complex URL projects within Expert System (ES) modules in 2009.

Journal Articles

The Challenge of development of a holistic waste management approach to support the Nuclear Renaissance

Makino, Hitoshi; Umeki, Hiroyuki; Hioki, Kazumasa; McKinley, I. G.*

Proceedings of International Waste Management Symposium 2009 (WM '09) (CD-ROM), 15 Pages, 2009/03

no abstracts in English

Journal Articles

Geosynthesis; Testing a safety case methodology at generic Japanese URLs

Hatanaka, Koichiro; Osawa, Hideaki; Umeki, Hiroyuki

Proceedings of 3rd Amigo Workshop on Approaches and Challenges for the Use of Geological Information in the Safety Case (CD-ROM), p.134 - 153, 2009/00

The paper describes the information flow methodology and its applicability to site selection in Japan, which involve provisional safety case development to support key decisions. Using the JAEA database for the two URLs at Mizunami and Horonobe, the maturity of the existing technology will be illustrated and key challenges for future development discussed.

128 (Records 1-20 displayed on this page)