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229 results on '"Hoshino, Tsuyoshi"'

8. Status of water cooled ceramic breeder blanket development

Author

Kawamura, Yoshinori, Tanigawa, Hisashi, Hirose, Takanori, Gwon, Hyoseong, Nakajima, Motoki, Takemura, Makoto, Nakata, Misato, Ishioka, Minoru, Yoshino, Seiji, Murakami, Hideo, Wakasa, Atsushi, Sato, Satoshi, Ochiai, Kentaro, Nakamura, Hirofumi, Hoshino, Tsuyoshi, Nakamichi, Masaru, Tanigawa, Hiroyasu, Hayashi, Takumi, and Yamanishi, Toshihiko

Published
2018
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22. Global Warming Effect and Adaptation for a Flooding Event at Motsukisamu River in Sapporo

Author

Kanamori, Yuka, Inatsu, Masaru, Tsurumaki, Ryoichi, Matsuoka, Naoki, Hoshino, Tsuyoshi, and Yamada, Tomohito J.

Subjects
Atmospheric Science
Abstract

A set of hydrological experiments for a flooding event on 11 September 2014 at Motsukisamu River in Sapporo were performed. Dynamical downscaling to 5-km resolution of a large-ensemble global simulation allowed us to estimate that a 99%-tile hourly precipitation in Sapporo would increase by 70% in a future climate, when the global-mean temperature increases by 4 K compared with the present climate. After developing a three-tank model of which parameters were optimized on the basis of the in-situ observation at the Motsukisamu River during the event period, the model was forced by hypothetical hyetographs of the event that would occur under the future climate. The results of this experiment suggested that the peak flow rate would increase by 75%. However, it was also revealed that an upstream aqueduct tunnel, just completed in autumn 2021, would effectively reduce the peak flow rate and mitigate the flooding risk even in extreme precipitation under the future climate.

Published
2022

43. Evaluation of Li mass loss from Li2TiO3 with excess Li pebbles in water vapor

Author

Katayama, Kazunari, Sakagawa, Haruaki, Fukada, Satoshi, and Hoshino, Tsuyoshi

Abstract

Understanding of Li mass transfer behavior in a tritium breeding blanket is an important issue from viewpoints of establishment of tritium cycle and tritium safety. In this work, weight reduction property of Li2TiO3 with excess Li pebbles, which were fabricated by National Institutes for Quantum and Radiological Science and Technology, was investigated and the amount of Li mass loss and the rate of Li mass loss in water vapor atmosphere at elevated temperatures were evaluated. The Li mass loss proceeding at 900 °C with a relatively high rate was limited. The Li mass loss of Pebble210 (Li/Ti=2.10) was 1.2 wt% and that of Pebbe211 (Li/Ti=2.11) was 1.4 wt%, eventually. The rate of the Li mass loss increased with increasing temperature and it seemed to increase proportionally to a square root of water vapor pressure. An empirical formula for the Li mass loss was proposed as a function of temperature, heating time and water vapor pressure in a purge gas.

Published
2019

44. Li vaporization property of Li8ZrO6 and Li5AlO4 as tritium breeders

Author

Kiyoto, Shin-mura, Honda, Shunsuke, Hoshino, Tsuyoshi, and Sasaki, Kazuya

Abstract

New tritium breeding materials that maintain large tritium breeding ratio for thermonuclear fusion reactors should be developed. In this study, we investigate the lithium-vaporization behavior from the sintered bodies of Li8ZrO6 and Li5AlO4 having high lithium atom densities. From the viewpoint of lithium density, we investigate the possibility of using the sintered compacts of Li8ZrO6 and Li5AlO4 as a tritium breeder. Lithium vaporization rates from the sintered bodies of Li8ZrO6 and Li5AlO4 are high. However, for both materials, the lithium vaporization rate gradually decreases with the annealing time by “self-stabilization” in which the surfaces of each sintered body are covered by the stable layer of the second phase. Considering the temperature dependency of equivalent vapor pressure and the volume fraction of tritium breeding material loaded at high-temperature region, it is suggested that the sintered compacts of Li8ZrO6 and Li5AlO4 have high potentials for the tritium breeder.

Published
2019

49. Corrosion characteristics of reduced activation ferritic-martensitic steel EUROFER by Li₂TiO₃ with excess Li

Author

Mukai, Keisuke, Sanchez, Fernando, Hoshino, Tsuyoshi, and Knitter, Regina

Subjects
Corrosion, Ceramic breeder, RAFM steel, DEMO blanket, Compatibility
Abstract

In a solid breeding blanket, ceramic breeder pebbles are in contact with reduced activation ferritic martensitic (RAFM) steel at high temperatures for years and accordingly form a corrosion layer on the blanket structural steel. Present study focuses on corrosion characteristics of EUROFER97 RAFM steel by an advanced breeder material of Li₂TiO₃ with excess Li (initial ratio of Li/Ti = 2.2) at 623, 823, and 1073 K under sweep gas (He + 0.1% H₂) flow. Formation of a thick oxide double layer was found on the surface of the EUROFER plates heated at 823 and 1073 K, while the corrosion layer formed at 673 K was

Published
2018

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