Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Aoki, Kazuhiro; Imai, Hirotaro; Seshimo, Kazuyoshi; Kimura, Megumi; Kirita, Fumio; Nakanishi, Ryuji
JAEA-Research 2024-005, 177 Pages, 2024/10
JAEA-Research-2024-005.pdf:12.02MB
This study presents a method for evaluating displacements on active faults that lack clear markers of fault offset. The method uses geological surveys, core studies, and chemical analyses along with hydraulic and mechanical tests. We applied this method to three test sites along the Shionohira Fault (Shionohira and Betto sites) and the Kuruma Fault (Minakamikita site). Laboratory friction tests on the fault gouge using a variable-speed, rotating shear friction apparatus were conducted. The samples from the Shionohira and Betto sites showed velocity weakening or strengthening, but no velocity dependence was observed at the Minakamikita site. A small-scale test to induce fault slip was conducted using the SIMFIP method. At the Shionohira site, fault slip can be modeled as a Coulomb rupture and shows a frictional dependence on slip velocity. On the other hand, at the Minakamikita site, a complex response using multiple fractures and slip planes was observed. Based on the water pressure response, the hydraulic properties of the area between the faults were evaluated. The transmissivity and specific storage are larger at Shionohira than at Minakamikita. Fault slip data such as shear plane attitude or shear sense were obtained from core samples and stress inversion analysis was performed. We attempted to elucidate the history of the movement and stress that formed the fracture zone. The results reconstructed five activity stages at Shionohira site and two stages at Minakamikita site. As shown in this report, the frictional properties, fault rupture mode, hydraulic properties and the history of fault motion were found to be different between the Shionohira and Kuruma sites. However, the results are based on a few locational data, so case studies at other sites and more applications to other faults should be considered to improve the reliability of the evaluation.
Oto, Tsutomu; Asano, Norikazu; Kawamata, Takanori; Yanai, Tomohiro; Nishimura, Arashi; Araki, Daisuke; Otsuka, Kaoru; Takabe, Yugo; Otsuka, Noriaki; Kojima, Keidai; et al.
JAEA-Review 2020-018, 66 Pages, 2020/11
JAEA-Review-2020-018.pdf:8.87MB
A collapse event of the cooling tower of secondary cooling system in the JMTR (Japan Materials Testing Reactor) was caused by the strong wind of Typhoon No.15 on September 9, 2019. The cause of the collapse of the cooling tower was investigated and analyzed. As the result, it was identified that four causes occurred in combination. Thus, the soundness of the cooling tower of Utility Cooling Loop (UCL cooling tower), which is a wooden cooling tower installed at the same period as the cooling tower of secondary cooling system, was investigated. The items of soundness survey are to grasp the operation conditions of the UCL cooling tower, to confirm the degradation of structural materials, the inspection items and inspection status of the UCL cooling tower, and to investigate the past meteorological data. As the results of soundness survey of the UCL cooling tower, the improvement of inspection items of the UCL cooling tower was carried out and the replacement and repair of the structural materials of the UCL cooling tower were planned for safe maintenance and management of this facility. And the renewal plan of new cooling tower was created to replace the existing UCL cooling tower. This report is summarized the soundness survey of the UCL cooling tower.
Nakano, Takafumi; Sato, Fuminori; Shirozu, Hidetomo; Nakanishi, Ryuji; Fukuda, Kazuhito; Tachibana, Ikuya
Nihon Genshiryoku Gakkai-Shi ATOMO
, 57(1), p.14 - 20, 2015/01
no abstracts in English
Nakanishi, Ryuji; Uryu, Mitsuru; Yamazaki, Toshihiko
Nihon Kenchiku Gakkai 2005-Nendo Taikai Gakujutsu Koen Kogaishu, p.757 - 758, 2005/09
None
Yamazaki, Toshihiko; Uryu, Mitsuru; Nakanishi, Ryuji; Kawai, Nobuyasu*; Hashimura, Hirohiko*
Nihon Kenchiku Gakkai 2005-Nendo Taikai Gakujutsu Koen Kogaishu, p.847 - 848, 2005/09
None
Nakanishi, Ryuji; Yamazaki, Toshihiko; Uryu, Mitsuru; Endo, Manabu*; Imazuka, Yoshikatsu*; Yoshida, Shinichi*
no journal, ,
no abstracts in English
Nakanishi, Ryuji; Yamazaki, Toshihiko; Uryu, Mitsuru; Endo, Manabu*; Imazuka, Yoshikatsu*; Yoshida, Shinichi*
no journal, ,
no abstracts in English
Kirita, Fumio; Uryu, Mitsuru; Yamazaki, Toshihiko; Nakanishi, Ryuji
no journal, ,
no abstracts in English
Kirita, Fumio; Uryu, Mitsuru; Yamazaki, Toshihiko; Nakanishi, Ryuji
no journal, ,
no abstracts in English
Kirita, Fumio; Uryu, Mitsuru; Yamazaki, Toshihiko; Hashimura, Hirohiko; Nakanishi, Ryuji; Kojima, Keidai
no journal, ,
no abstracts in English
Nakanishi, Ryuji; Uryu, Mitsuru; Yamazaki, Toshihiko; Hashimura, Hirohiko; Kirita, Fumio; Kojima, Keidai
no journal, ,
no abstracts in English
Hashimura, Hirohiko; Uryu, Mitsuru; Yamazaki, Toshihiko; Nakanishi, Ryuji; Kirita, Fumio; Kojima, Keidai
no journal, ,
no abstracts in English
Osugi, Takeshi; Nakashio, Nobuyuki; Mimura, Ryuji; Nonaka, Kazuharu; Nakanishi, Yoshiki; Okoshi, Minoru; Tokizawa, Takayuki; Nakayama, Shinichi; Kimura, Takeshi*
no journal, ,
To reduce volume of wastes that consisted of plants and soil generated from decontamination works on farmland, we have produced a pilot-scale pyrolysis furnace by rotary kiln type and had some heat-treatment tests. In this reports, we shows some results of the tests on two kinds of paddy soils in Iitate-village.
Hashimura, Hirohiko; Uryu, Mitsuru; Yamazaki, Toshihiko; Nakanishi, Ryuji; Kirita, Fumio; Kojima, Keidai
no journal, ,
no abstracts in English
Kirita, Fumio; Uryu, Mitsuru; Yamazaki, Toshihiko; Hashimura, Hirohiko; Nakanishi, Ryuji; Kojima, Keidai
no journal, ,
no abstracts in English
Kojima, Keidai; Uryu, Mitsuru; Yamazaki, Toshihiko; Hashimura, Hirohiko; Nakanishi, Ryuji; Kirita, Fumio
no journal, ,
no abstracts in English
Nakanishi, Ryuji; Uryu, Mitsuru; Yamazaki, Toshihiko; Hashimura, Hirohiko; Kirita, Fumio; Kojima, Keidai
no journal, ,
no abstracts in English
Uryu, Mitsuru; Kirita, Fumio; Yamazaki, Toshihiko; Hashimura, Hirohiko; Nakanishi, Ryuji; Kojima, Keidai
no journal, ,
no abstracts in English
Sato, Fuminori; Nakanishi, Ryuji; Kosaka, Ichiro; Nakano, Takafumi; Nagasato, Yoshihiko
no journal, ,
no abstracts in English
Nakanishi, Ryuji; Sato, Fuminori; Kosaka, Ichiro; Nakano, Takafumi; Nagasato, Yoshihiko
no journal, ,
no abstracts in English
