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Ohshima, Hiroyuki; Morishita, Masaki*; Aizawa, Kosuke; Ando, Masanori; Ashida, Takashi; Chikazawa, Yoshitaka; Doda, Norihiro; Enuma, Yasuhiro; Ezure, Toshiki; Fukano, Yoshitaka; et al.
Sodium-cooled Fast Reactors; JSME Series in Thermal and Nuclear Power Generation, Vol.3, 631 Pages, 2022/07
This book is a collection of the past experience of design, construction, and operation of two reactors, the latest knowledge and technology for SFR designs, and the future prospects of SFR development in Japan. It is intended to provide the perspective and the relevant knowledge to enable readers to become more familiar with SFR technology.
Morita, Hisashi; Daigo, Fumihisa; Sayato, Natsuki; Watahiki, Shunsuke; Kojima, Kazuki; Nakayama, Kazuhiko; Ide, Hiroshi
JAEA-Technology 2021-030, 166 Pages, 2022/05
JAEA-Technology-2021-030.pdf:3.65MB
When the roof of the JMTR Hot Laboratory (HL) building was repaired for rain leaks in January, 2015, thinning was found at one of the anchor bolts on base of the HL exhaust stack. Moreover, the thinning of some anchor bolts and gaps between the anchor bolt nuts and flange plate was found in the later investigation for the exhaust stack. Since the possibility of the exhaust stack collapsing cannot be denied, it was removed. Therefore, it became necessary to rebuild a new exhaust stack as soon as possible. The design of the new exhaust stack was based on the measures to prevent rainwater intrusion into the base, which was the cause of the thinning of the anchor bolts found in the investigation, and on the new regulatory standards established after the accident at the Fukushima Daiichi Nuclear Power Station. Furthermore, since the new exhaust stack corresponds to buildings and structures that must undergo building confirmation, the soundness of the new exhaust stack against seismic force and wind load was evaluated based on the Building Standards Law and the Stack Structure Design Guideline. This report described the basic design of the new exhaust stack.
Otsu, Shuya; Suzuki, Hisanori; Sasaki, Shunichi; Takase, Yuki; Itoga, Shunta; Ouchi, Masayuki; Yanagibashi, Futoshi; Terunuma, Hirotaka; Morita, Kazuki; Komori, Tsuyoshi
no journal, ,
no abstracts in English
Nonoue, Kazuki; Hojo, Yuki; Fujiwara, Wataru; Yamamoto, Takashi; Morita, Shu; Koda, Yuya
no journal, ,
no abstracts in English
Kusaka, Shota; Ouchi, Masayuki; Aoki, Kenji; Yanagibashi, Futoshi; Tokoro, Hayate; Oyanagi, Naoki; Morita, Kazuki; Terunuma, Hirotaka; Nakabayashi, Hiroki
no journal, ,
Tokai Reprocessing Plant (TRP) implemented safety measures for High Active Liquid Waste Storage Facility (HAW) and Tokai Vitrification Facility (TVF) using portable equipment to effectively reduce risks, aligned with new regulatory requirements. TRP developed accident response measures and evaluated their effectiveness to maintain confinement and decay heat removal of high active liquid waste and to prevent its evaporation, in case of utility loss caused by external hazards. Accident response equipment was seismically qualified and distributed above the tsunami inundation level, with associated utility systems deployed, and access routes to HAW and TVF secured. Through accident response training, required time and personnel were evaluated to verify response effectiveness. Based on the results, procedures were refined to enhance practical effectiveness.
Inose, Kenta; Ouchi, Masayuki; Tobita, Ryuto; Aoki, Kenji; Asada, Naoki; Kusaka, Shota; Morita, Kazuki; Oyama, Koichi; Sumi, Hirotaka; Nakabayashi, Hiroki
no journal, ,
At the Tokai Reprocessing Plant, safety measures have been taken to maintain important safety functions in the High Active Liquid Waste Storage Facility (HAW) and Tokai Vitrification Facility (TVF), which handle high active liquid waste, in accordance with new regulatory requirements and assuming the occurrence of internal events such as fire and flooding. Fire prevention measures were taken to prevent the occurrence of fires, detect and extinguish fires, and mitigate the impact of fires. Flooding measures were taken to effects of submersion, water coverage, and steam due to flooding. In addition to measures against internal hazards, measures for external hazards and accident response measures have been completed, improving the safety of the HAW and TVF.
