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Terashima, Kenichi; Okumura, Keisuke
no journal, ,
The dose rate around the surface of retrieved fuel debris is important information for radiation shielding, handling, transport, analysis and storage of the fuel debris. Therefore, we have developed a dose rate prediction method applicable to various fuel debris to be sampled from the Fukushima Daiichi Nuclear Power Station in the near future. Using the method, we predicted the dose rate of the fuel debris to be sampled in 2021 and clarified the sensitivities to the contributing parameters.
Thwe Thwe, A.; Terada, Atsuhiko; Hino, Ryutaro
no journal, ,
Since hydrogen is continuously generated and releases inside of high-level radioactive waste vessels, the awareness must be taken on the risk of hydrogen combustion and explosion. In hydrogen safety management, besides the experimental investigations, CFD approaches in predictions of flame propagation phenomena are of important role. As an approach to analysis of hydrogen combustion inside of vessels, we used the open source software, OpenFOAM and performed the simulations for propagation of H
-air premixed flame. A new laminar flame speed model deduced from H-air explosion experiments by T. Katsumi et al. [Nagaoka Univ. Tech.] was implemented in the XiFoam solver and reproduced the propagation of H-air flame. Flame radius obtained by simulation agreed with the experimental results within 0.005s. Wrinkle flame formation was observed when the flame propagated outwardly as in experiments.
Ito, Rintaro; Ono, Takahiro; Tsuchida, Yoshihiro; Okada, Takashi
no journal, ,
The Naraha Center for Remote Control Technology Development provides an operation training system for decommissioning work using immersive virtual reality technology. The current status of the preparation of VR data of Fukushima Daiichi Nuclear Power Station.
Cantarel, V.; Arisaka, Makoto; Yamagishi, Isao
no journal, ,
Furuse, Takahiro; Ota, Yuki; Do, V. K.
no journal, ,
The Japan Atomic Energy Agency has been developing Okuma Analysis and Research Center, a research and development facility, in order to ascertain the properties of radioactive wastes and fuel debris towards the decommissioning of TEPCO's Fukushima Daiichi Nuclear Power Station (1F). In this presentation, we are reporting outline and construction status of Laboratory-1 which will analyse low and medium level samples in the Okuma Analysis and Research Center.
Zr by ICP-QQQ-MS and automated sample preparation instrumentsDo, V. K.; Furuse, Takahiro; Ota, Yuki
no journal, ,
This presentation outlines our idea of method development for the analysis of Zr with application of ICP-QQQ-MS after a simple chemical separation using automated sample preparation instruments.
Kato, Jun; Taniguchi, Takumi; Osugi, Takeshi; Nakazawa, Osamu; Sone, Tomoyuki; Kuroki, Ryoichiro
no journal, ,
Contaminated water treatment secondary wastes have diversity and have property without processing achievement so far. Tasks for applicability evaluation of these wastes were extracted concerning solidification technologies with applied achievement for radioactive waste processing by FY2017. This report introduces research and development for solving the extracted tasks.
Saruta, Koichi; Kamei, Naomitsu; Sato, Yuji; Muramatsu, Toshiharu
no journal, ,
Yamada, Taichi; Kawabata, Kuniaki
no journal, ,
For decommissioning of Fukushima Daiichi Nuclear Power Plant (1F), workers need to know about work site information for working efficiency and safety of themselves. Mapping technology in robotics called Simultaneous localization and mapping (SLAM) is useful for sharing the site information. Though, there are still technical problems for applying SLAM to 1F tough environments. This paper shows the development of the SLAM evaluation method aimed to enhance the research of SLAM for 1F.
Sato, Tomonori; Hata, Kuniki; Kaji, Yoshiyuki; Inoue, Hiroyuki*; Taguchi, Mitsumasa*; Seito, Hajime*; Tada, Eiji*; Abe, Hiroshi*; Akiyama, Eiji*; Suzuki, Shunichi*
no journal, ,
Since risk of corrosion degradation for plant materials in Fukushima-Daiichi Power Plant (1F) site have been increasing with time duration and/or environmental changes by decommissioning procedure, we will build a corrosion and radiolysis database in irradiated condition including estimating data area for 1F corrosion.
Ichikawa, Masashi*; Kaneko, Masaaki*; Koma, Yoshikazu; Hinai, Hiroshi; Nitta, Ayako; Shibata, Atsuhiro
no journal, ,
To study on treatment and disposal of solid waste generated at Fukushima Daiichi NPS (1F), radionuclide composition of sample taken from the bottom of primary containment vessel (PCV) of unit 1 was acquired by radioactivity analysis. It was the first time that nuclide composition data of samples taken from the inside of the reactor had been acquired, and the acquisition of these data will make it possible to estimate the origin of contaminants.
Suzuki, Kenta; Mukaida, Shunji; Abe, Fumiaki; Kawabata, Kuniaki
no journal, ,