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JAEA Reports

Annual report for FY2021 on the activities of Naraha Center for Remote Control Technology Development (April 1, 2021 - March 31, 2022)

Akiyama, Yoichi; Shibanuma, So; Yanagisawa, Kenichi*; Yamada, Taichi; Suzuki, Kenta; Yoshida, Moeka; Ono, Takahiro; Kawabata, Kuniaki; Watanabe, Kaho; Morimoto, Kyoichi; et al.

JAEA-Review 2023-015, 60 Pages, 2023/09

JAEA-Review-2023-015.pdf:4.78MB

Naraha Center for Remote Control Technology Development (NARREC) was established in Japan Atomic Energy Agency to promote a decommissioning work of Fukushima Daiichi Nuclear Power Station (Fukushima Daiichi NPS). NARREC consists of a Full-scale Mock-up Test Building and Research Management Building. Various test facilities are installed in these buildings for the decommissioning work of Fukushima Daiichi NPS. These test facilities are intended to be used for various users, such as companies engaged in the decommissioning work, research and development institutions, educational institutions and so on. The number of NARREC facility uses was 84 in FY2021. We participated booth exhibitions and presentations on the decommissioning related events. Moreover, we also contributed to the development of human resources by supporting the 6th Creative Robot Contest for Decommissioning. As a new project, "Narahakko Children's Classroom" was implemented for elementary school students in Naraha Town. This report summarizes the activities of NARREC in FY2021, such as the utilization of facilities and equipment of NARREC, the development of remote-control technologies for supporting the decommissioning work, arrangement of the remote-control machines for emergency response, and training for operators by using the machines.

JAEA Reports

Annual report for FY2020 on the activities of Naraha Center for Remote Control Technology Development (April 1, 2020 - March 31, 2021)

Naraha Center for Remote Control Technology Development, Fukushima Research Insitute

JAEA-Review 2022-021, 40 Pages, 2022/09

JAEA-Review-2022-021.pdf:2.54MB

Naraha Center for Remote Control Technology Development (NARREC) was established in Japan Atomic Energy Agency to promote a decommissioning work of Fukushima Daiichi Nuclear Power Station (Fukushima Daiichi NPS). NARREC consists of a Full-scale Mock-up Test Building and Research Management Building. Various test facilities are installed in these buildings for the decommissioning work of Fukushima Daiichi NPS. These test facilities are intended to be used for various users, such as companies engaged in the decommissioning work, research and development institutions, educational institutions and so on. The number of NARREC facility uses was 69 in FY2020. We participated booth exhibitions and presentations on the decommissioning related events. Moreover, we also contributed to the development of human resources by supporting the 5th Creative Robot Contest for Decommissioning on online because of the COVID-19. This report summarizes the activities of NARREC in FY2020, such as the utilization of facilities and equipment of NARREC, the development of remote control technologies for supporting the decommissioning work, arrangement of the remote control machines for emergency response, and training for operators by using the machines.

Journal Articles

Observation of vibration characteristics of a cylindrical water tank by a phase-shifted optical pulse interference sensor

Morishita, Hideki*; Yoshida, Minoru*; Nishimura, Akihiko; Matsudaira, Masayuki*; Hirayama, Yoshiharu*; Sugano, Yuichi*

Hozengaku, 20(1), p.101 - 108, 2021/04

no abstracts in English

Journal Articles

Processes affecting land-surface dynamics of $^{129}$ I impacted by atmospheric $^{129}$ I releases from a spent nuclear fuel reprocessing plant

Ota, Masakazu; Terada, Hiroaki; Hasegawa, Hidenao*; Kakiuchi, Hideki*

Science of the Total Environment, 704, p.135319_1 - 135319_15, 2020/02

https://doi.org/10.1016/j.scitotenv.2019.135319

Times Cited Count：6 Percentile：30.02(Environmental Sciences)

Land-surface transfers of $^{129}$ I are modeled and incorporated into a land-surface model (SOLVEG-II), and the model was applied to the observed transfer of $^{129}$ I at a vegetated field impacted by atmospheric releases of $^{129}$ I from Rokkasho reprocessing plant during 2007 to investigate the importance of each $^{129}$ I-transfer pathway. The model calculation revealed that contamination of leaves of wild bamboo grasses was mostly caused by foliar adsorption of $^{129}$ I (81%) induced via wet deposition of $^{129}$ I. Wet deposition of $^{129}$ I was the main $^{129}$ I-input to the soil, ten-fold the dry deposition of $^{129}$ I $_{2}$ ; however, the deposition of $^{129}$ I during 2007 was only 2% of the model-assumed $^{129}$ I that pre-existed in the soil; indicating the importance of long-term accumulation of $^{129}$ I in soils. The model calculation also revealed that root uptake of $^{129}$ I, not methylation, control the long-term turnover of soil $^{129}$ I.

Journal Articles

Importance of root uptake of $^{14}$ CO $_{2}$ on $^{14}$ C transfer to plants impacted by below-ground $^{14}$ CH $_{4}$ release

Ota, Masakazu; Tanaka, Taku*

Journal of Environmental Radioactivity, 201, p.5 - 18, 2019/05

https://doi.org/10.1016/j.jenvrad.2019.01.012

Times Cited Count：4 Percentile：16.8(Environmental Sciences)

$^{14}$ CH $_{4}$ released from deep underground radioactive waste disposal facilities can be a belowground source of $^{14}$ CO $_{2}$ owing to microbial oxidation of $^{14}$ CH $_{4}$ to $^{14}$ CO $_{2}$ in soils. Environmental $^{14}$ C models assume that the transfer of $^{14}$ CO $_{2}$ from soil to plant occurs via foliar uptake of $^{14}$ CO $_{2}$ . Nevertheless, the importance of $^{14}$ CO $_{2}$ root uptake is not well understood. In the present study, belowground transport and oxidation of $^{14}$ CH $_{4}$ were modeled and incorporated into an existing land surface $^{14}$ CO $_{2}$ model (SOLVEG-II) to assess the importance of root uptake on $^{14}$ CO $_{2}$ transfer to plants. Performance of the model in calculating the belowground dynamics of $^{14}$ CH $_{4}$ was validated by simulating a field experiment of $^{13}$ CH $_{4}$ injection into subsoil. The model was then applied to $^{14}$ C transfer in a hypothetical ecosystem impacted by continuous $^{14}$ CH $_{4}$ input from the water table (bottom of one-meter thick soil). In a shallowly rooted ecosystem with rooting depth of 11 cm, foliar uptake of $^{14}$ CO $_{2}$ was significant, accounting for 80% of the $^{14}$ C accumulation in the leaves. In a deeply rooted ecosystem (rooting depth of 97 cm), where the root penetrated to depths close to the water-table, more than half (63%) the $^{14}$ C accumulated in the leaves was transferred by the root uptake. We found that $^{14}$ CO $_{2}$ root uptake in this ecosystem depended on the distribution of methane oxidation in the soil; all $^{14}$ C accumulated in the leaves was transferred by the root uptake when methane oxidation occurred at considerable depths (e-folding depths of 20 cm, or 80 cm). These results indicate that $^{14}$ CO $_{2}$ root uptake contributes significantly to $^{14}$ CO $_{2}$ transfer to plants if $^{14}$ CH $_{4}$ oxidation occurs at great depths and roots penetrate deeply into the soil.

Journal Articles

Introduction of Naraha Center for Remote Control Technology Development; A Facility for demonstration test of remote-controlled equipment

Tsuchida, Yoshihiro

Robotto, (246), p.78 - 79, 2019/01

no abstracts in English

Journal Articles

Naraha Center for Remote Control Technology Development; Enhancement of remote control technology for nuclear decommissioning

Kawabata, Kuniaki

Nihon Robotto Gakkai-Shi, 36(7), p.460 - 463, 2018/09

no abstracts in English

Journal Articles

Challenge to decommissioning of Fukushima Daiichi Nuclear Power Station by applying VR technology

Horiguchi, Kenichi

Gijutsushi, 30(4), p.8 - 11, 2018/04

AA2017-0669.pdf:1.0MB

The verification activity and training of operation in the Fukushima-Daiichi Nuclear Power Station are more important than another Nuclear Power Station. At the JAEA Naraha Remote Technology Development Center, it has being carried out the development work to apply to the decommissioning work by using the full sized mock up and VR system which is built based on location surveying data of inside the reactor building. It is able to contribute to the decommissioning more reliably and efficiently.

Journal Articles

Activities of Naraha Remote Technology and Development Center for decommissioning of Fukushima Daiichi Nuclear Power Station

Tanifuji, Yuta

Genshiryoku Nenkan 2018, p.96 - 97, 2017/10

no abstracts in English

Journal Articles

Naraha Remote Technology Development Center and robots for nuclear disaster

Kawatsuma, Shinji

Dekomisshoningu Giho, (54), p.24 - 33, 2016/09

It has passed more than five years than Tokyo Electric Power Company's Fukushima Daiichi NPPs accidents occurred by huge tsunamis caused by the earthquake in Pacific Ocean Coast of North East District on March 11, 2011. It is very hard for workers to enter and stay for long time to work for decommissioning, because the radiation dose rate in the reactor buildings is too high to extremely high caused by radioactive materials released. Then the Naraha Remote Development Center has been constructed and taken into full operation in April 2016, which center would accelerate the development of remote technologies conducting decommissioning on the behalf of workers. The center is developing robot simulator system and robot performance testing method which could support developing remote operating equipment and devices. Also the center is preparing and operating remote equipment and devices for nuclear emergency response.

Journal Articles