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Collaborative Laboratories for Advanced Decommissioning Science; Sapporo University*
JAEA-Review 2025-033, 71 Pages, 2025/11
JAEA-Review-2025-033.pdf:4.48MB
The Collaborative Laboratories for Advanced Decommissioning Science (CLADS), Japan Atomic Energy Agency (JAEA), had been conducting the Nuclear Energy Science & Technology and Human Resource Development Project (hereafter referred to "the Project") in FY2023. The Project aims to contribute to solving problems in the nuclear energy field represented by the decommissioning of the Fukushima Daiichi Nuclear Power Station (1F), Tokyo Electric Power Company Holdings, Inc. (TEPCO). For this purpose, intelligence was collected from all over the world, and basic research and human resource development were promoted by closely integrating/collaborating knowledge and experiences in various fields beyond the barrier of conventional organizations and research fields. The sponsor of the Project was moved from the Ministry of Education, Culture, Sports, Science and Technology to JAEA since the newly adopted proposals in FY2018. On this occasion, JAEA constructed a new research system where JAEA-academia collaboration is reinforced and medium-to-long term research/development and human resource development contributing to the decommissioning are stably and consecutively implemented. Among the adopted proposals in FY2023, this report summarizes the research results of the "High-speed 3D modeling for nuclear reactor environment based on feature extraction results from video images" conducted in FY2023. The present study aims to develop a 3D model for a workspace that maximizes the amount of information based on the features extracted from video, which is taken when surveying the primary containment vessel and inside the reactor building as part of the decommissioning of 1F, considering within a specified time. In FY2023, we verified extracting effective shooting conditions for obtaining 3D reconstruction based on photogrammetry and the method extracting feature values that can generate 3D restoration results from a small amount of data within a specified time based on deep learning. In addition, we applied point cloud data extracted from video to segmentation and classified it into parts with instance labels.
Uchida, Mao*; Alzahrani, H.*; Shiono, Mikihito*; Sakai, Takaaki*; Matsushita, Kentaro; Ezure, Toshiki; Tanaka, Masaaki
Proceedings of 19th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-19) (Internet), 16 Pages, 2022/03
Gas entrainment from cover gas is one of key issues for sodium-cooled fast reactors design to prevent unexpected effects to core reactivity. A vortex model based evaluation method has been developed to evaluate the surface vortex gas core growth at the free surface in the reactor vessel. In this study, water experiments were performed to clarify the prediction accuracy for the vortex gas core growth during the vortex drift motion using a circulating water tunnel with an open flow channel test section. Gas core growth were predicted by applying the evaluation method to the numerical analyses performed in the same geometry of the experiments, and compared with the experimental results. It was observed the gas core growth became large at downstream region where downward velocity became large in experiment. However, the gas core length which were predicted from numerical result showed a discrepancy with the experimental result on the peak position and an overestimation of peak value.
Takahashi, Satoru*; Okuda, Yasutake*; Kawabata, Kuniaki; Aonuma, Hitoshi*; Sato, Yutaka*; Iwata, Kenji*
Journal of Signal Processing, 20(2), p.65 - 74, 2016/03
Kato, Katsumi*; Kume, Etsuo
JAERI-Data/Code 2002-019, 116 Pages, 2002/09
JAERI-Data-Code-2002-019.pdf:26.15MB
no abstracts in English
Nakamura, Hideo; Shibamoto, Yasuteru; Anoda, Yoshinari; Kukita, Yutaka*; Mishima, Kaichiro*; Hibiki, Takashi*
Nuclear Technology, 125(2), p.213 - 224, 1999/02
Times Cited Count：11 Percentile：59.22(Nuclear Science & Technology)no abstracts in English
Kunii, Katsuhiko
Flow Visualization and Image Processing 1997, Vol.2, p.592 - 597, 1997/02
no abstracts in English
Takase, Kazuyuki; Kunugi, Tomoaki; Fujii, Sadao*; Shibazaki, Hiroaki*
Flow Visualization Image Process. 1997, 1(00), p.185 - 190, 1997/00
no abstracts in English
Takenaka, Nobuyuki*; Asano, Hitoshi*; Fujii, Terushige*; Ushiro, Toshihiko*; Iwatani, Junji*; Murata, Yutaka*; Mochiki, Koichi*; Taguchi, Akira*; Matsubayashi, Masahito; Tsuruno, Akira
Nuclear Instruments and Methods in Physics Research A, 377(1), p.174 - 176, 1996/07
Times Cited Count：1 Percentile：23.31(Instruments & Instrumentation)no abstracts in English
10, 1995, JAERI, Tokai, Japan; Research Committee on Reactor Physics
JAERI-Conf 96-002, 160 Pages, 1996/02
no abstracts in English
; ; ; ; Matsubayashi, Masahito; Tsuruno, Akira
Fifth World Conf. on Neutron Radiography, 0, p.610 - 616, 1996/00
no abstracts in English
; ; Fujii, Terushige*; ; ; ; Matsubayashi, Masahito; Tsuruno, Akira
Fifth World Conf. on Neutron Radiography, 0, p.623 - 629, 1996/00
no abstracts in English
; ; Fujii, Terushige*; ; ; ; Matsubayashi, Masahito; Tsuruno, Akira
Nuclear Instruments and Methods in Physics Research A, 377, p.170 - 173, 1996/00
Times Cited Count：0 Percentile：0.00(Instruments & Instrumentation)no abstracts in English
; ; Fujii, Terushige*; ; ; Matsubayashi, Masahito; Tsuruno, Akira
Nuclear Instruments and Methods in Physics Research A, 377, p.156 - 160, 1996/00
Times Cited Count：8 Percentile：57.95(Instruments & Instrumentation)no abstracts in English
; ; Fujii, Terushige*; ; Matsubayashi, Masahito; Tsuruno, Akira
Nuclear Instruments and Methods in Physics Research A, 377, p.115 - 118, 1996/00
Times Cited Count：16 Percentile：76.84(Instruments & Instrumentation)no abstracts in English
Tsuji, Yoshiyuki*; ; ; ; ; ; Matsubayashi, Masahito; Fujine, Shigenori*
Nuclear Instruments and Methods in Physics Research A, 377, p.148 - 152, 1996/00
Times Cited Count：7 Percentile：54.54(Instruments & Instrumentation)no abstracts in English
; ; ; ; Tsuruno, Akira; Matsubayashi, Masahito
Nuclear Instruments and Methods in Physics Research A, 377, p.144 - 147, 1996/00
Times Cited Count：7 Percentile：54.54(Instruments & Instrumentation)no abstracts in English
; ; Fujii, Terushige*; ; ; ; Matsubayashi, Masahito; Tsuruno, Akira
Nuclear Instruments and Methods in Physics Research A, 377, p.153 - 155, 1996/00
Times Cited Count：8 Percentile：57.95(Instruments & Instrumentation)no abstracts in English
; ; ; ; Matsubayashi, Masahito; Tsuruno, Akira
Nuclear Instruments and Methods in Physics Research A, 377, p.130 - 132, 1996/00
Times Cited Count：1 Percentile：23.31(Instruments & Instrumentation)no abstracts in English
26, 1993, TokaiJAERI-Conf 94-002, 154 Pages, 1994/07
no abstracts in English
Kubo, Shinji; Akino, Norio; Akiyama, Mitsunobu*;
Dai-31-Kai Nihon Dennetsu Shimpojiumu Koen Rombunshu, 0, p.373 - 375, 1994/05
no abstracts in English
