Research plan on geosphere stability for long-term isolation of radioactive waste (Scientific program for fiscal year 2022)

Sasao, Eiji; Ishimaru, Tsuneari; Niwa, Masakazu; Shimada, Akiomi; Shimada, Koji; Watanabe, Takahiro; Sueoka, Shigeru; Yokoyama, Tatsunori; Fujita, Natsuko; Ogita, Yasuhiro; et al.

JAEA-Review 2022-022, 29 Pages, 2022/09

JAEA-Review-2022-022.pdf:0.97MB

This report is a plan of research and development (R&D) on geosphere stability for long-term isolation of high-level radioactive waste (HLW) in Japan Atomic Energy Agency (JAEA), in fiscal year 2022. The objectives and contents in fiscal year 2022 are described in detail based on the JAEA 4th Medium- and Long-term Plan (fiscal years 2022-2028). In addition, the background of this research is described from the necessity and the significance for site investigation and safety assessment, and the past progress. The plan framework is structured into the following categories: (1) Development and systematization of investigation techniques, (2) Development of models for long-term estimation and effective assessment, (3) Development of dating techniques

High temperature gas-cooled reactors

Takeda, Tetsuaki*; Inagaki, Yoshiyuki; Aihara, Jun; Aoki, Takeshi; Fujiwara, Yusuke; Fukaya, Yuji; Goto, Minoru; Ho, H. Q.; Iigaki, Kazuhiko; Imai, Yoshiyuki; et al.

High Temperature Gas-Cooled Reactors; JSME Series in Thermal and Nuclear Power Generation, Vol.5, 464 Pages, 2021/02

https://doi.org/10.1016/C2018-0-05383-9

As a general overview of the research and development of a High Temperature Gas-cooled Reactor (HTGR) in JAEA, this book describes the achievements by the High Temperature Engineering Test Reactor (HTTR) on the designs, key component technologies such as fuel, reactor internals, high temperature components, etc., and operational experience such as rise-to-power tests, high temperature operation at 950C, safety demonstration tests, etc. In addition, based on the knowledge of the HTTR, the development of designs and component technologies such as high performance fuel, helium gas turbine and hydrogen production by IS process for commercial HTGRs are described. These results are very useful for the future development of HTGRs. This book is published as one of a series of technical books on fossil fuel and nuclear energy systems by the Power Energy Systems Division of the Japan Society of Mechanical Engineers.

Holographic realization of ferromagnets

Yokoi, Naoto*; Ishihara, Masafumi*; Sato, Koji*; Saito, Eiji

Physical Review D, 93(2), p.026002_1 - 026002_6, 2016/01

https://doi.org/10.1103/PhysRevD.93.026002

Hydrogen production by thermochemical water-splitting IS process utilizing heat from high-temperature reactor HTTR

Sakaba, Nariaki; Kasahara, Seiji; Ohashi, Hirofumi; Sato, Hiroyuki; Kubo, Shinji; Terada, Atsuhiko; Nishihara, Tetsuo; Onuki, Kaoru; Kunitomi, Kazuhiko

Proceedings of 16th World Hydrogen Energy Conference (WHEC-16) (CD-ROM), 11 Pages, 2006/06

High-temperature reactors (HTRs) are particularly attractive due to their wide industrial application from electricity generation to hydrogen production. The Japan Atomic Energy Agency's (JAEA's) HTTR, which is the first HTR in Japan, attained its maximum reactor-outlet coolant temperature and successfully delivered 950C coolant helium outside its reactor vessel. A hydrogen production system based on the thermochemical water-splitting iodine sulphur (IS) process is planned to be connected to the HTTR in the near future. This will establish the hydrogen production technology with an HTR, including the system integration technology for connection of hydrogen production system to HTRs. It will probably be the world's first demonstration of hydrogen production directly using heat supplied from an HTR. The HTTR-IS system design was launched from a conceptual design in 2005. This paper shows the summary of the HTTR, plan for developing the IS process in JAEA, thermal efficiency evaluation for the HTTR-IS system, etc. The verification of the hydrogen production by the HTTR-IS system by using heat from a nuclear reactor is greatly expected to contribute to the commercialization of nuclear hydrogen in coming hydrogen society.

Opacity effect on extreme ultraviolet radiation from laser-produced tin plasmas

Fujioka, Shinsuke*; Nishimura, Hiroaki*; Nishihara, Katsunobu*; Sasaki, Akira; Sunahara, Atsushi*; Okuno, Tomoharu*; Ueda, Nobuyoshi*; Ando, Tsuyoshi*; Tao, Y.*; Shimada, Yoshinori*; et al.

Physical Review Letters, 95(23), p.235004_1 - 235004_4, 2005/12

https://doi.org/10.1103/PhysRevLett.95.235004

no abstracts in English

Characterization of extreme ultraviolet emission from laser-produced spherical tin plasma generated with multiple laser beams

Shimada, Yoshinori*; Nishimura, Hiroaki*; Nakai, Mitsuo*; Hashimoto, Kazuhisa*; Yamaura, Michiteru*; Tao, Y.*; Shigemori, Keisuke*; Okuno, Tomoharu*; Nishihara, Katsunobu*; Kawamura, Toru*; et al.

Applied Physics Letters, 86(5), p.051501_1 - 051501_3, 2005/01

https://doi.org/10.1063/1.1856697

no abstracts in English

High-frame rate neutron radioscopy with a steady thermal neutron beam

Mishima, Kaichiro*; Hibiki, Takashi*; Fujine, Shigenori*; Yoneda, Kenji*; Kanda, Keiji*; Nishihara, Hideaki*; Matsubayashi, Masahito; Tsuruno, Akira

Fifth World Conf. on Neutron Radiography, 0, p.140 - 147, 1996/00

no abstracts in English

Application of neutron radiography to visualization and void fraction measurement of air-water two-phase flow in a small diameter tube

Hibiki, Takashi*; Mishima, Kaichiro*; Yoneda, Kenji*; Fujine, Shigenori*; Kanda, Keiji*; Nishihara, Hideaki*; Tsuruno, Akira; Matsubayashi, Masahito

Journal of Nuclear Science and Technology, 30(6), p.516 - 523, 1993/06

https://doi.org/10.1080/18811248.1993.9734513

no abstracts in English

Technical aspects of aqueous homogeneous reactor

Sugimoto, Asao; Takeda; Furuhashi, Akira; Katsuragi, Satoru; Hirota, Jitsuya; Naito, Keiji; Kondo, Yasuko; Nagasaki, Ryukichi; Yamazaki, Yasaburo; Kuroi, Hideo; et al.

JAERI 4018, 52 Pages, 1961/06

JAERI-4018.pdf:4.14MB

no abstracts in English

Hydrogen production in radiolysis of mixture of water and mordenite, and a proposal of a method for evaluation of the radiation-chemical yield

Kumagai, Yuta; Nagaishi, Ryuji; Yamada, Reiji; Nishihara, Kenji; Yamagishi, Isao; Ogawa, Toru

no journal, , 

The amount of hydrogen produced in -radiolysis of mixture of seawater and mordenite was studied. The measured yield was decreased with decrease in the weight fraction of seawater. However, the yield was not simply proportional to the weight fraction of seawater and the influence of the mordenite was observed as additional production of hydrogen. At a weight fraction of seawater more than 0.2, the measured amount of hydrogen could be explained by an empirical equation given by a liner combination of two hydrogen production terms representing hydrogen production due to the energy deposition to seawater and that to mordenite. Each of the terms was expressed as a product of the absorbed energy and a yield given as the proportionality coefficient, and each of the yields could be a constant independent of the mixture ratio. The result imply an instinctive explanation of hydrogen production from the mixture of solid and liquid using the two respective yields.