Research on engineering technology in the full-scale demonstration of EBS and operation technology for HLW disposal; Research report in 2013 (Joint research)

Fujita, Tomoo; Tanai, Kenji; Nakayama, Masashi; Sawada, Sumiyuki*; Asano, Hidekazu*; Saito, Masahiko*; Yoshino, Osamu*; Kobayashi, Masato*

JAEA-Research 2014-031, 44 Pages, 2015/03

JAEA-Research-2014-031.pdf:16.11MB

Japan Atomic Energy Agency (JAEA) and Radioactive Waste Management Funding and Research Center (RWMC) concluded the letter of cooperation agreement on the research and development of radioactive waste disposal in April, 2005, and have been carrying out the collaboration work based on the agreement. JAEA have been carrying out the Horonobe Underground Research Laboratory (URL) Project which is intended for a sedimentary rock in the Horonobe town, Hokkaido, since 2001. In the project, geoscientific research and research and development on geological disposal technology are being promoted. Meanwhile, the government (the Agency for Natural Resources and Energy, Ministry of Economy, Trade and Industry) has been promoting construction of equipments for the full-scale demonstration of engineered barrier system (EBS) and operation technology for high-level radioactive waste (HLW) disposal since 2008, to enhance public's understanding to the geological disposal of HLW, e.g. using underground facility. RWMC received an order of the project in fiscal year 2012 (2011/2012) continuing since fiscal year 2008 (2008/2009). Since topics in this project are included in the Horonobe URL Project, JAEA carried out this project as collaboration work continuing since fiscal year 2008. This report summarizes the results of engineering technology carried out in this collaboration work in fiscal year 2013. In fiscal year 2013, emplacement tests using buffer material block for the vertical emplacement concept were carried out and visualization tests for water penetration in buffer material were carried out.

Research on engineering technology in the full-scale demonstration of EBS and operation technology for HLW disposal; Research report in 2011 (Joint research)

Nakatsuka, Noboru; Sato, Haruo; Tanai, Kenji; Sugita, Yutaka; Nakayama, Masashi; Sawada, Sumiyuki*; Niinuma, Hiroaki*; Asano, Hidekazu*; Saito, Masahiko*; Yoshino, Osamu*; et al.

JAEA-Research 2013-027, 34 Pages, 2013/11

JAEA-Research-2013-027.pdf:5.84MB

Japan Atomic Energy Agency (JAEA) and Radioactive Waste Management Funding and Research Center (RWMC) concluded the letter of cooperation agreement on the research and development of radioactive waste disposal in April, 2005, and have been carrying out the collaboration work based on the agreement. JAEA have been carrying out the Horonobe Underground Research Laboratory (URL) Project which is intended for a sedimentary rock in the Horonobe town, Hokkaido, since 2001. In the project, geoscientific research and research and development on geological disposal technology are being promoted. Meanwhile, the government (the Agency for Natural Resources and Energy, Ministry of Economy, Trade and Industry) has been promoting construction of equipments for the full-scale demonstration of engineered barrier system and operation technology for high-level radioactive waste (HLW) disposal since 2008, to enhance public's understanding to the geological disposal of HLW, e.g. using underground facility. RWMC received an order of the project in fiscal year 2010 (2010/2011) continuing since fiscal year 2008 (2008/2009). Since topics in this project are included in the Horonobe URL Project, JAEA carried out this project as collaboration work continuing in fiscal year 2008. This report summarizes the results of engineering technology carried out in this collaboration work in fiscal year 2011. In fiscal year 2011, part of the equipments for emplacement of buffer material was produced and visualization test for water penetration in buffer material were carried out.

Fusion plasma performance and confinement studies on JT-60 and JT-60U

Kamada, Yutaka; Fujita, Takaaki; Ishida, Shinichi; Kikuchi, Mitsuru; Ide, Shunsuke; Takizuka, Tomonori; Shirai, Hiroshi; Koide, Yoshihiko; Fukuda, Takeshi; Hosogane, Nobuyuki; et al.

Fusion Science and Technology (JT-60 Special Issue), 42(2-3), p.185 - 254, 2002/09

https://doi.org/10.13182/FST02-A227

With the main aim of providing physics basis for ITER and the steady-state tokamak reactors, JT-60/JT-60U has been developing and optimizing the operational concepts, and extending the discharge regimes toward sustainment of high integrated performance in the reactor relevant parameter regime. In addition to achievement of the equivalent break-even condition (QDTeq up to 1.25) and a high fusion triple product = 1.5E21 m-3skeV, JT-60U has demonstrated the integrated performance of high confinement, high beta-N, full non-inductive current drive with a large fraction of bootstrap current in the reversed magnetic shear and in the high-beta-p ELMy H mode plasmas characterized by both internal and edge transport barriers. The key factors in optimizing these plasmas are profile and shape controls. As represented by discovery of various Internal Transport Barriers, JT-60/JT-60U has been emphasizing freedom and restriction of profiles in various confinement modes. JT-60U has demonstrated applicability of these high confinement modes to ITER and also clarified remaining issues.

Isolation of the improved core confinement from high recycling and radiative boundary in reversed magnetic shear plasmas of JT-60U

Itami, Kiyoshi; Yoshino, Ryuji; Asakura, Nobuyuki; Fujita, Takaaki; Hosogane, Nobuyuki; Naito, Osamu; Higashijima, Satoru; Konoshima, Shigeru

Physical Review Letters, 78(7), p.1267 - 1270, 1997/02

https://doi.org/10.1103/PhysRevLett.78.1267

no abstracts in English

Steady state high performance in JT-60U

Kamada, Yutaka; Ushigusa, Kenkichi; Neyatani, Yuzuru; Naito, Osamu; Ozeki, Takahisa; Kawano, Yasunori; Yoshino, Ryuji; Kubo, Hirotaka; Fujita, Takaaki; Ishida, Shinichi; et al.

IAEA-CN-60/A5-5, 0, p.651 - 661, 1995/00

no abstracts in English

ELMy H-mode with high and high in JT-60U

Kamada, Yutaka; Ushigusa, Kenkichi; Naito, Osamu; Neyatani, Yuzuru; Ishida, Shinichi; Fujita, Takaaki; Yoshino, Ryuji; Kikuchi, Mitsuru; Mori, Masahiro; Ninomiya, Hiromasa

Plasma Physics and Controlled Fusion, 36, p.A123 - A128, 1994/00

https://doi.org/10.1088/0741-3335/36/7A/015

no abstracts in English

Large m=3/n=1 locked mode its stabilization

Ninomiya, Hiromasa; Itami, Kiyoshi; Neyatani, Yuzuru; Naito, Osamu; Yoshino, Ryuji

Nuclear Fusion, 28(7), p.1275 - 1281, 1988/00

https://doi.org/10.1088/0029-5515/28/7/010

no abstracts in English

In-situ evaluation of high accuracy elastic wave measurement system with pseudo random wave

Ishiyama, Koji*; Yoshino, Osamu*; Hikima, Ryoichi*; Matsui, Hiroya; Ozaki, Yusuke; Takeuchi, Ryuji; Sakakibara, Junichi*; Sanoki, Satoru*; Hayashi, Kunihiko*

no journal, , 

In this study, we evaluate the high accurate elastic wave measurement system at the 500m stage in Mizunami underground research laboratory. We used the sine and pseudo random wave between 0.5 kHz and 20 kHz as source signals and received them by 6 receivers. We observed that the elastic wave became low speed and high attenuation around the zone where the rock classification was lower than surroundings. From this result, we could capture the damaged zone by elastic wave. For the capability of deeper exploration, we need to improve the transmission system.