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Journal Articles

LASSO reconstruction scheme to predict radioactive source distributions inside reactor building rooms; Practical applications

Machida, Masahiko; Shi, W.*; Yamada, Susumu; Miyamura, Hiroko; Yoshida, Toru*; Hasegawa, Yukihiro*; Okamoto, Koji; Aoki, Yuto; Ito, Rintaro; Yamaguchi, Takashi; et al.

Proceedings of Waste Management Symposia 2023 (WM2023) (Internet), 11 Pages, 2023/02

Journal Articles

Stoichiometry between humate unit molecules and metal ions in supramolecular assembly induced by Cu$$^{2+}$$ and Tb$$^{3+}$$ measured by gel electrophoresis techniques

Nakano, Sumika*; Marumo, Kazuki*; Kazami, Rintaro*; Saito, Takumi*; Haraga, Tomoko; Tasaki-Handa, Yuiko*; Saito, Shingo*

Environmental Science & Technology, 55(22), p.15172 - 15180, 2021/11

 Times Cited Count:4 Percentile:36.59(Engineering, Environmental)

Humic acid (HA) can strongly complex with metal ions to form a supramolecular assembly via coordination binding. However, determining the supramolecular size distribution and stoichiometry between small HA unit molecules constituting HA supramolecule and metal ions has proven to be challenging. Here, we investigated the changes in the size distributions of HAs induced by Cu$$^{2+}$$ and Tb$$^{3+}$$ ions using a unique polyacrylamide gel electrophoresis (PAGE) for the separation and quantification of HA complexes and metal ions bound, followed by UV-Vis spectroscopy and EEM-PARAFAC. It was found that the supramolecular behaviors of Cu$$^{2+}$$ and Tb$$^{3+}$$ complexes with HA collected from peat and deep groundwater (HHA) differed. Our results suggest that this supramolecular stoichiometry is related to the abundance of sulfur atoms in the elemental composition of HHA. Our results provide new insights into HA supramolecules formed via metal complexation.

Journal Articles

Conformational dynamics of a multidomain protein by neutron scattering and computational analysis

Nakagawa, Hiroshi; Saio, Tomohide*; Nagao, Michihiro*; Inoue, Rintaro*; Sugiyama, Masaaki*; Ajito, Satoshi; Tominaga, Taiki*; Kawakita, Yukinobu

Biophysical Journal, 120(16), p.3341 - 3354, 2021/08

 Times Cited Count:1 Percentile:30.58(Biophysics)

A multi-domain protein can have various conformations in solution. Interactions with other molecules result in the stabilization of one of the conformations and change in the domain dynamics. SAXS, a well-established experimental technique, can be employed to elucidate the conformation of a multi-domain protein in solution. NSE spectroscopy is a promising technique for recording the domain dynamics in nanosecond and nanometer scale. Despite the great efforts, there are still under development. Thus, we quantitatively removed the contribution of diffusion dynamics and hydrodynamic interactions from the NSE data via incoherent scattering, revealing the differences in the domain dynamics of the three functional states of a multi-domain protein, MurD. The differences among the three states can be explained by two domain modes.

Journal Articles

Development of a robot simulation system for remotely operated robots for operator proficiency training and robot performance verification

Kawabata, Kuniaki; Suzuki, Kenta; Isowa, Mitsuru*; Horiuchi, Kazunori; Ito, Rintaro

Proceedings of 14th International Conference on Ubiquitous Robots and Ambient Intelligence (URAI 2017) (USB Flash Drive), p.561 - 564, 2017/06

This paper describes the current status of the development of a simulation system for remotely operated robots. The system will be used for operator proficiency training and robot performance verification. Our purpose for developing this system is to contribute to decommissioning of the Fukushima Daiichi Nuclear Power Station (FDNPS). The simulator system was designed using Choreonoid, a simulator development tool. The effects of view disturbances, communication failures, and so on are extended functions that are implemented on the simulator. The effects of water submergence on the physical behavior of underwater robots are also implemented. In this paper, we introduce the prototype of the robotic simulator system with the newly implemented extended functions. Some examples of system output are shown.

Oral presentation

Naraha Remote Technology Development Center overview

Ito, Rintaro

no journal, , 

no abstracts in English

Oral presentation

Remote technology development for function advancement of research base, 2; Installation of virtual reality system for operator training

Tsuchida, Yoshihiro; Isowa, Mitsuru; Suzuki, Kenta; Ito, Rintaro; Ichitsubo, Koji

no journal, , 

no abstracts in English

Oral presentation

Development of a simulator of remotely operated robots and implementation of user support tools

Suzuki, Kenta; Isowa, Mitsuru; Ito, Rintaro; Horiuchi, Kazunori*; Kawabata, Kuniaki

no journal, , 

Oral presentation

A Choreonoid based simulator for nuclear emergency response robots

Isowa, Mitsuru; Suzuki, Kenta; Ito, Rintaro; Horiuchi, Kazunori*; Kawabata, Kuniaki

no journal, , 

Simulation technology is important for efficient development of remotely operated robots for decommissioning Fukushima Daiichi Nuclear Power Plants (herein referred to as 1F) and training operators to use the robots. We developed an extension to Choreonoid to simulate operation of an underwater, remotely operated vehicle (ROV). The extension was developed using a network traffic controller and includes 3D environmental models of 1F. This paper provides an overview of the extension.

Oral presentation

Development of simulation technology for nuclear emergency response; Multicopter simulation and gamma camera simulation

Suzuki, Kenta; Horiuchi, Kazunori; Kawabata, Kuniaki; Ito, Rintaro

no journal, , 

Oral presentation

Improvement of VR system in decommissioning of Fukushima Daiichi Nuclear Power Station

Ito, Rintaro; Suzuki, Kenta; Horiuchi, Kazunori; Hirano, Hiroyasu

no journal, , 

In the decommissioning of TEPCO Fukushima Daiichi Nuclear Power Plant (1F), it is important to prepare in advance based on data and information on the spatial structure and dose distribution within the facility is important. The virtual reality system (VR system) of the Naraha Remote Technology Development Center presents the structure and equipment of 1F in 3D and can also present the dose distribution. This system is utilized for planning, training, etc. of the work related to decommissioning. In order to make effective use of this VR system in the future, it is also required to reproduce precisely the situation at the work site, to enable planning and training, etc of work in the situation close to the workplace. To that end, it will be necessary to expand 1F data to be incorporated into the VR system and to quickly reflect on-site situations that are constantly changing due to work. In this paper, we report on attempts to enhance the functions of the VR system that we recently worked on, taking into account such points.

Oral presentation

Development of operation training function of remote control device for decommissioning using VR system

Ito, Rintaro; Suzuki, Kenta; Horiuchi, Kazunori; Kawabata, Kuniaki; Kawatsuma, Shinji; Suzuki, Hiroyuki*; Dekura, Toshinori*

no journal, , 

This paper, describe the development of the operation training function for repair work of leakage part of reactor primary containment vessel by remotely operated manipulator using VR. Remote operation of the manipulator with limited feedback information is difficult and therefore prior operation proficiency training is important to complete such difficult task safely. Therefore, we are developing an operation training function that enables the operator not only to perform operation training, but also to confirm the operation of the remote control device actually operated by himself in the actual size and three-dimensionally in the VR space. In this paper, we reported current status of the development and recent improvements for operation training function.

Oral presentation

Accuracy improvement of operation training function of remote control device

Ono, Takahiro; Kubuta, Yoshitsune*; Ito, Rintaro; Suzuki, Kenta; Kawabata, Kuniaki; Nosaki, Nobuhisa; Dekura, Toshinori*

no journal, , 

Oral presentation

Preparation of VR data for utilization to decommissioning of Fukushima Daiichi Nuclear Power Station

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.

Oral presentation

Development of a sensor unit for simultaneous collection of dose rate and measurement position

Kawabata, Kuniaki; Shirasaki, Norihito*; Abe, Hiroyuki*; Hanari, Toshihide; Ito, Rintaro; Imabuchi, Takashi; Yamada, Taichi

no journal, , 

This paper describes a system for realizing simultaneous and synchronized collection of air dose rates and measurement locations for efficient dosimetry survey and spatio-temporal dosimetry data logging in nuclear facilities. The prototype system, which is currently under development, mainly consists of a 3D LiDAR-SLAM unit and a dosimeter integrated in a ROS framework. In this paper, we present the configuration of the prototype and the preliminary experimental results of dosimeter position estimation using it.

Oral presentation

Development of a measurement unit that acquires dose rate data along with estimated measurement position data

Kawabata, Kuniaki; Imabuchi, Takashi; Shirasaki, Norihito*; Suzuki, Soichiro; Ito, Rintaro

no journal, , 

Oral presentation

Oral presentation

Development of exposure reduction technologies by digitalization of environment and radioactive source distribution, 6; Computational method validation and effectiveness evaluation of an estimation system of radiation sources and dose rates

Aoki, Yuto; Ito, Rintaro; Kitamura, Akihiro; Omori, Takazumi; Taniguchi, Tatsuro; Ide, Hiroshi

no journal, , 

In this report, we present the validation results of the radiation source inverse estimation computation method and the effectiveness evaluation method of the "estimation system of radiation sources and dose rates" developed by JAEA. As for the validation test, the JMTR was used as the evaluation site, and the results of radiation source inverse estimation computations were compared with measured data. As a result, it was confirmed that the hot spot could be estimated approximately well. As for the effectiveness evaluation, the test field to be established at the NARREC and at the JMTR were used as the evaluation sites, and the effectiveness evaluation items such as the functions of each tool and the process of the system were summarized.

Oral presentation

Development of exposure reduction technologies by digitalization of environment and radioactive source distribution, 10; Understanding and 3D modeling of working environmental data by using deep learning

Doi, Akio*; Yamashita, Meguru*; Takahashi, Hiroki*; Kato, Toru*; Imabuchi, Takashi; Hanari, Toshihide; Tanifuji, Yuta; Ito, Rintaro

no journal, , 

no abstracts in English

Oral presentation

Development of exposure reduction technologies by digitalization of environment and radioactive source distribution; Current status of development project

Suzuki, Masahiro; Yamaguchi, Takashi; Machida, Masahiko; Kawabata, Kuniaki; Ito, Rintaro

no journal, , 

In the decommissioning of the Fukushima Daiichi NPS (1F), prior to the full-scale implementation of fuel debris removal operations, it is necessary to improve the on-site environment in order to safely and efficiently construct access routes in the reactor building (R/B). Then, JAEA is now developing a prototype system that estimates radioactive source distributions by using on-site dose rate data and examines countermeasure effects of such as decontamination, shielding with estimated contamination (radiation sources) on the estimated sources in cyberspace. This report presents overview of the development project and its current status.

27 (Records 1-20 displayed on this page)