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Prihutami, P.*; Toda, Kanako*; Chaerun, R. I.; Oya, Yusuke*; Kikuchi, Ryosuke*; Otake, Tsubasa*; Sato, Tsutomu*; Saito, Takumi*
Applied Clay Science, 292, p.108330_1 - 108330_9, 2026/11
Times Cited Count：0Limited understanding of zinc (Zn) immobilization in altered geopolymers limits prediction of waste-form durability. This study examined the local structure and retention mechanism of Zn in a metakaolin-based potassium geopolymer by X-ray absorption spectroscopy (XAS). Zn-bearing samples were prepared from metakaolin, zinc chloride (ZnCl
) solution, potassium silicate, and potassium hydroxide, cured at 40
C and 25C for 48 h, and leached in deionized water for up to 90 days. Zn release was only 0.14%, with limited Al, Si, and Cl release. The main geopolymer framework was preserved after leaching. XAS showed that Zn was initially tetrahedrally coordinated with oxygen and linked to Si or Al tetrahedra. After leaching, Zn changed to octahedral coordination and formed a brucite-like Al-bearing co-precipitate, indicating strong Zn retention despite local structural alteration.
Collaborative Laboratories for Advanced Decommissioning Science; Hokkaido University*
JAEA-Review 2026-017, 78 Pages, 2026/09
JAEA-Review-2026-017.pdf:5.67MB
The Collaborative Laboratories for Advanced Decommissioning Science (CLADS), Japan Atomic Energy Agency (JAEA), has been conducting the Nuclear Energy Science & Technology and Human Resource Development Project (hereafter referred to "the Project") from FY2019. 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 "Development of a prototype shielding-free radiation-resistant diamond neutron measurement system" conducted in FY2024. The present study aims to develop a prototype shielding-free neutron measurement system for 1F. The system consists of diamond neutron detectors and radiation-resistant silicon integrated circuits, and future applications are expected to include neutron detectors for debris investigation, criticality proximity monitoring monitors, and neutron detectors for dry tube investigation in pressure vessels. In this development, a prototype consisting of 100 diamond detector elements of 5 mm square will be developed to obtain system construction technology and to evaluate system performance. In addition, a subcriticality evaluation method will be developed. In FY2024, Hokkaido Univ. made progress in establishing mass-production technology for self-supporting diamond detector elements. At AIST, the search for deposition conditions of multilayer films for detectors using the CVD method advanced. At KEK, the operation of the improved ASIC was confirmed, and using a wiring printing device, detector elements were mounted on signal processing circuit boards, followed by neutron measurement tests. The development of a criticality proximity monitoring method, led mainly by Nagoya Univ., advanced in its fundamental studies, and an evaluation test of the diamond neutron measurement system at UTR-KINKI is planned. At Kyushu Univ. and JAEA, evaluations of the diamond neutron measurement system in gamma-ray irradiation fields and thermal neutron isotropic fields proceeded as scheduled.
Liu, R.*; Yan, S.*; Nishio, Katsuhisa; Makii, Hiroyuki; Orlandi, R.; 17 of others*
Chinese Physics C, 50(9), p.094004_1 - 094004_6, 2026/09
Irie, Kenta; Terada, Hiroaki; Kawamura, Hideyuki; Takano, Masahide
Journal of Environmental Radioactivity, 299, p.108140_1 - 108140_20, 2026/09
This study develops an Explosive-release Particle Tracking Model (EPTM) and couples it with the Worldwide version of System for Prediction of Environmental Emergency Dose Information (WSPEEDI) to explicitly represent the explosion-induced initial condition in atmospheric dispersion simulation. The developed model is designed to resolve the particle dynamics immediately after an explosive release and to provide a physically based initial condition for subsequent atmospheric transport simulations. To demonstrate the capability and impact of EPTM, numerical experiments were conducted under the idealized meteorological field. The results show that the impact of explosion-induced initial motion on concentration and surface deposition is substantial near the explosion point but diminishes with transport distance. Immediately after explosive release, the explosive case produces a rapid vertical redistribution of radioactive materials. This vertical redistribution increases concentration near the surface and increases surface deposition near the release point compared with the non-explosive case. As a result, air concentration maxima and surface deposition patterns near the explosion point are controlled by the explosion-driven initial conditions represented by EPTM. In contrast, in the downwind area, differences in air concentration and surface deposition between the explosive and non-explosive cases become small because horizontal advection and turbulent diffusion govern the spatial distribution of the concentration and deposition, reducing the relative influence of the initial explosion as the plume evolves. Consequently, increasing explosive energy amplifies the contrast of air concentration and surface deposition near the explosion point while exerting limited influence on downwind concentration and deposition distributions.
Hamdani, A.; Soma, Shu; Abe, Satoshi; Shibamoto, Yasuteru
Nuclear Engineering and Technology, 58(9), p.104219_1 - 104219_9, 2026/09
Marufuji, Takato; Ueta, Shohei; Kawaguchi, Koichi; Watanabe, Masashi; Yan, X.
JAEA-Technology 2026-011, 22 Pages, 2026/08
JAEA-Technology-2026-011.pdf:1.84MB
In microcapsule production employing a novel double-layer coating technique in which the fuel core is pre-sealed, the required droplet size is larger than that in conventional methods, necessitating a re-examination of the optimal manufacturing conditions. However, conventional equipment involves multiple operating parameters that vary simultaneously, making it difficult to isolate and evaluate the effect of each parameter and thus hindering the identification of optimal conditions. In addition, the economic performance of the equipment is an important issue for practical application. To address these challenges, this study developed a new apparatus that enables independent control and evaluation of each parameter while also reducing cost.
Shindo, Ryuji; Ichimura, Takahito; Nozawa, Yoshihiko; Komori, Tsuyoshi; Rachi, Reona; Kitahara, Katsumi*; Nakamura, Tomoki*; Koike, Akihiro*
JAEA-Technology 2026-005, 379 Pages, 2026/08
JAEA-Technology-2026-005.pdf:45.42MB
Laboratory-1 of the Radioactive Material Analysis and Research Facility (Laboratory-1) is a facility for analyzing and testing the properties of low and medium radiation dose debris, logging, incinerator ash, and secondary wastes from the decommissioning of the TEPCO HD Fukushima Daiichi Nuclear Power Station (1F) to obtain technical prospects for treatment and disposal measures and their safety. In addition, the ALPS treated water was analyzed by a third party independent of TEPCO HD prior to its discharge into the sea. Laboratory-1 was constructed by the Japan Atomic Energy Agency from January 2017 to June 2022 as part of the 1F Specific Nuclear Facility. The construction work of Laboratory-1 is classified into "building work" for construction of the building by architectural work, electrical equipment work, and mechanical equipment work, and "interior equipment work" for the maintenance of analysis facilities such as iron cells, glove boxes, hoods, etc. This report is a compilation of construction records related to the "building work" that Okuma Construction Office was in charge of. This report is a compilation of construction records and other information related to "building construction" handled by Okuma Construction Office. This report comprehensively summarizes the experience and knowledge from a technical perspective on construction management related to the construction of nuclear facilities, including quality control and construction status for each type of building work, composite coordination, implementation systems and methods for safety and construction quality management, and permits and approvals (such as changes to implementation plans, building permit applications, and forest land development permits). The report also includes a summary of the specific management details such as radiation control for construction in special environments such as construction on the 1F site and construction in a difficult-to-return zone. In the future, we hope that this report will be used as a reference for the development of nuclear facilities such as Laboratory-1, contributing to the identification of issues and rational facility planning.
Hiraoka, Hirokazu; Kawasaki, Kohei*; Kimura, Masanori; Saito, Shota; Ezaki, Iwao*; Kameda, Shuji*; Togawa, Orihiko
Nihon Genshiryoku Gakkai Wabun Rombunshi (Internet), 25(3), p.111 - 121, 2026/08
A method to enable the simultaneous inspection of tires and the wiper area using a portable radiationportal monitor is being developed to improve the efficiency of vehicle inspection during contaminationscreening. To achieve this, we devised an approach to identify whether contamination is located on the tires orin the wiper area. We designed an L-shaped measurement configuration, where detectors are positionedhorizontally near the ground and vertically upright. An identification approach based on this L-shapedconfiguration was evaluated using Monte Carlo simulations. The results showed that the magnitude relation ofcounts measured by the horizontal and vertical detectors varies depending on whether the point source islocated on the tires or in the wiper area. We examined an identification method that utilizes this relationshipto determine the contaminated location. Next, we conducted measurements using a portal monitor (GammaPole, manufactured by Chiyoda Technol) and attempted to identify the contaminated location by the L-shapedmeasurement method. As a result, in the experiment simulating tire contamination, all 30 measurementscorrectly identified the tires as the contaminated location. In contrast, in the experiment simulating wipercontamination, 29 out of 30 measurements correctly identified the wiper area.
Sanada, Yukihisa; Suyama, Kenya; Iijima, Kazuki
Nihon Genshiryoku Gakkai-Shi ATOMO
, 68(8), p.529 - 533, 2026/08
no abstracts in English
Shi, W.*; Machida, Masahiko; Okamoto, Koji*; Luo, X.*; Feng, W.*; Liu, X.*
Reliability Engineering & System Safety, 272, Part1, p.112538_1 - 112538_18, 2026/08
The reliability of emergency response in severe nuclear accidents critically depends on robust real-time monitoring of radioactive source distributions. However, this safety function is challenged by physical constraints that create monitoring blind spots and by the inadequacy of static methods in tracking dynamic releases. To enhance the reliability and robustness of source term estimation, this study proposes a dynamic reconstruction framework based on LASSO regression with temporal regularization. A sliding-window time-penalty mechanism is introduced, imposing 
-norm constraints on inter-step source variations to ensure physical continuity. The contribution matrix and measurement vector are normalized to counteract biases from radiation shielding and time-varying intensities. Validation using a two-room model with internal shielding, with PHITS Monte Carlo simulation, demonstrates accurate reconstruction of dynamic sources from remote measurements. Temporal regularization enhances situational awareness by suppressing spatial aliasing: at sliding-window width 
(no regularization), hotspot locations fluctuate significantly, with quantitative mean absolute error fluctuations at around 
, whereas 
yields improved spatial consistency and the fluctuation quantities decrease to the 
range. Comparative analysis identifies 
as optimal in balancing accuracy and computational cost. This work establishes a more reliable pathway for dynamic hazard assessment, enabling accurate localization and intensity tracking under challenging conditions. The proposed framework provides a decision-support tool enhancing the resilience and safety of emergency management in nuclear facilities.
Collaborative Laboratories for Advanced Decommissioning Science; The University of Osaka*
JAEA-Review 2026-009, 81 Pages, 2026/07
JAEA-Review-2026-009.pdf:5.42MB
The Collaborative Laboratories for Advanced Decommissioning Science (CLADS), Japan Atomic Energy Agency (JAEA), has been conducting the Nuclear Energy Science & Technology and Human Resource Development Project (hereafter referred to "the Project") from FY2019. The Project aims to contribute to solving problems in the nuclear energy field represented by the decommissioning of the Fukushima Daiichi Nuclear Power Station, 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 FY2024, this report summarizes the research results of the "Development of a radiation resistant laser scanner and 3D modeling method using AI and image processing" conducted in FY2024. This research focuses on developing a radiation-resistant 3D laser scanner and technologies to enhance the quality of point cloud data. A new scanner system was designed with a laser scanning head composed only of radiation-tolerant electrical and mechanical components, excluding semiconductors, and a control unit placed remotely in a low-radiation zone. The system aims to enable stable scanning in high-radiation environments. Its performance will be evaluated in comparison with commercial scanners. To address the sparsity of acquired point clouds, we are developing two complementary systems: one uses machine learning to complete and enhance point clouds through processes such as denoising, normalization, and interpolation; the other uses photogrammetry to reconstruct 3D data from image sets and integrate it with scanner-derived data. In FY2024, (1) Optical and electronic circuits were designed and assembled, and waveform collection and analysis software was developed to prepare for scanner detection efficiency evaluation. (2) A point cloud completion system incorporating AI was implemented, and methods for point cloud densification and completion were investigated. (3) A processing environment and workflow were established to integrate point clouds with photogrammetry, and 3D surface models were constructed. (4) Efficient scanning strategies under high-radiation conditions were analyzed, and a methodology for accuracy evaluation was studied. (5) The project was advanced through close coordination among research components and related institutions.
Collaborative Laboratories for Advanced Decommissioning Science; High Energy Accelerator Research Organization*
JAEA-Review 2026-006, 53 Pages, 2026/07
JAEA-Review-2026-006.pdf:2.98MB
The Collaborative Laboratories for Advanced Decommissioning Science (CLADS), Japan Atomic Energy Agency (JAEA), has been conducting the Nuclear Energy Science & Technology and Human Resource Development Project (hereafter referred to "the Project") from FY2019. 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 FY2024, this report summarizes the research results of the "Development of core technologies for a wireless communication chipset with radiation tolerance (baseband circuit development)" conducted in FY2024. The present study aims to develop a wireless communication system operable within the reactor of 1F, focusing on radiation-hardened circuit technologies. The project is divided into two sub-themes: "High-frequency analog circuit development" and "Baseband circuit development." This study is responsible for the baseband circuit development, designing analog components such as variable gain amplifiers, data converters, phase-locked loops, and clock generators. It also involves designing digital components for error correction, encoding, and radiation-hardened RAM. To validate circuit performance, we will build a software/hardware co-design environment. Additionally, we will develop low-power, high-stability piezoelectric oscillators and measure their radiation tolerance. The ultimate goal is to prototype a wireless communication chipset capable of 2.5 Mbps or higher data rates and withstanding radiation doses exceeding 1 MGy.
Collaborative Laboratories for Advanced Decommissioning Science; Institute of Science Tokyo*
JAEA-Review 2026-005, 51 Pages, 2026/07
JAEA-Review-2026-005.pdf:3.06MB
The Collaborative Laboratories for Advanced Decommissioning Science (CLADS), Japan Atomic Energy Agency (JAEA), has been conducting the Nuclear Energy Science & Technology and Human Resource Development Project (hereafter referred to "the Project") from FY2019. 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 FY2024, this report summarizes the research results of the "Development of core technologies for a wireless communication chipset with radiation tolerance (RF analog circuit development)" conducted in FY2024. The present study aims to establish a wireless communication system operable inside the reactor containment vessel and the reactor pressure vessel of 1F, and to develop key circuit technologies with radiation tolerance. The elemental developments will be carried out through the collaboration of two subthemes: RF analog circuit development and baseband circuit development. In this research, we are responsible for the RF analog circuit development, designing and implementing various circuits using radiation-tolerant silicon CMOS integrated circuit technology as well as diamond semiconductor devices. For silicon CMOS high-frequency analog circuits, RF analog signal processing circuits such as power amplifiers, low-noise amplifiers, mixers, and variable-gain amplifiers will be developed. For diamond semiconductor technology, device-level development of power amplifiers and power management circuits will be conducted. Ultimately, this project aims to realize prototype components of a wireless communication chipset capable of achieving a data rate of 2.5 Mbps or higher while withstanding a total ionizing dose exceeding 1 MGy.
Futemma, Akira; Kudo, Tamotsu; Takahashi, Fumiaki
JAEA-Research 2026-002, 51 Pages, 2026/07
JAEA-Research-2026-002.pdf:3.35MB
Rapid assessment of wide-area dose rate distributions is essential in aerial radiation monitoring during a nuclear emergency. Under contract with the Nuclear Regulation Authority, JAEA has developed a real-time data transmission system to receive gamma-ray count rates and positional information from crewed helicopters. However, the conventional system only displayed position and count-rate data on a map and did not support either real-time dose rate conversion or mapping. In this study, a real-time analysis method was developed for aerial radiation monitoring data acquired via satellite communication at approximately 30-second intervals and implemented in the existing system. The method integrates dose rate conversion at 1 m above ground level, automatic extraction of valid flightline data, and dose rate mapping. Cosmic-ray and airborne radionuclide corrections were simplified based on previous monitoring data. A machine-learning model based on aircraft flight behavior was developed to automate flight-line data extraction, which had relied on visual inspection using GIS. IDW interpolation and mapping procedures suitable for 30-second interval data were determined. Comparison with conventional post-flight analysis showed that the method reproduced the main trends of dose rate distributions. Operational testing confirmed normal operation from data reception to map display and delivery of results within several seconds. These results provide a technical basis for real-time dose rate mapping from satellite-transmitted aerial monitoring data during nuclear emergencies.
Fukushima Research and Engineering Institute*
JAEA-Evaluation 2026-004, 29 Pages, 2026/07
JAEA-Evaluation-2026-004.pdf:1.05MB
JAEA-Evaluation-2026-004-appendix(CD-ROM).zip:174.35MB
Japan Atomic Energy Agency (hereinafter referred to as "JAEA") consulted an assessment committee, "Evaluation Committee of Research and Development related to the Accident at TEPCO's Fukushima Daiichi Nuclear Power Station" (hereinafter referred to as "Committee") for ex-ante evaluations of "Research and Development Related to the Accident at TEPCO's Fukushima Daiichi Nuclear Power Station" in accordance with "General Guideline for the Evaluation of Government Research and Development (R&D) Activities" by Cabinet Office, Government of Japan, "Guideline for Evaluation of R&D in Ministry of Education, Culture, Sports, Science and Technology" and "Regulation on Conduct for Evaluation of R&D Activities" by JAEA. Based on a request from JAEA, the committee conducted a mid-evaluation of research and development activities in the current phase (April 2022 to March 2026). This report summarizes the results of the assessment by the Committee.
Saisu, Motofumi*; Ochi, Kotaro; Uchiyama, Keizo*; Mizuno, Naruhito*; Yoshida, Masashi*; Sanada, Yukihisa
Journal of Radiological Protection, 46(3), p.031506_1 - 031506_12, 2026/07
Times Cited Count：0After evacuation orders were lifted in Specified Reconstruction and Revitalization Base Areas following the Fukushima Daiichi accident, individual external doses of outdoor workers were measured using personal dosimeters and compared with airborne-derived ambient dose rates. Median hourly doses after lifting were significantly lower than before. The median conversion coefficient from ambient to individual dose was 0.39, below the commonly used value of 0.6, but consistent with previous results. These findings indicate that current government models provide conservative dose estimates and that conversion coefficients remain stable under post-evacuation conditions.
Minami, Shoko*; Matsuno, Haruki*; Morita, Kyohei*; Matsuki, Rintaro*; Kotegawa, Hisashi*; Harima, Hisatomo*; Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika*; Tou, Hideki*
Journal of the Physical Society of Japan, 95(7), p.074711_1 - 074711_11, 2026/07
Times Cited Count：0
Hg region; Derivative analysis approachKattikat Melcom, D. T.*; Tsekhanovich, I.*; Guezet, F.*; Andreyev, A. N.*; Nishio, Katsuhisa
Physical Review C, 114(1), p.014627_1 - 014627_8, 2026/07
Times Cited Count：0Collaborative Laboratories for Advanced Decommissioning Science; Institute of Science Tokyo*
JAEA-Review 2026-007, 65 Pages, 2026/06
JAEA-Review-2026-007.pdf:4.67MB
The Collaborative Laboratories for Advanced Decommissioning Science (CLADS), Japan Atomic Energy Agency (JAEA), has been conducting the Nuclear Energy Science & Technology and Human Resource Development Project (hereafter referred to "the Project") from FY2019. The Project aims to contribute to solving problems in the nuclear energy field represented by the decommissioning of the Fukushima Daiichi Nuclear Power Station, 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 FY2024, this report summarizes the research results of the "Development of a laser deflection-type ultrasonic wideband 3D imaging system for in-vessel visualization in high-radiation and non-visible environments" conducted in FY2024. The present study aims to maximize the safety of debris-cutting operations by enabling visualization of in-vessel structures, fuel debris shapes, and scattered particles at distances on the order of several meters, even under dusty and turbid water conditions during work. To achieve this, a compact and portable ultrasonic device suitable for mounting on robots and manipulator arms is employed to develop a laser deflection-type ultrasonic wideband 3D imaging system. In FY2024, the project carried out imaging performance evaluation and studies for the advancement and acceleration of the ultrasonic imaging system, numerical simulations, prototyping and full-scale verification of the system, radiation resistance tests, construction of a submillimeter ultrasonic ranging system, application of the ultrasonic sub-millimeter ranging system to LIBS, as well as battery-powered remote operation of the measurement system. These outcomes are summarized in this report.
Collaborative Laboratories for Advanced Decommissioning Science; Tohoku University*
JAEA-Review 2026-003, 173 Pages, 2026/06
JAEA-Review-2026-003.pdf:12.5MB
The Collaborative Laboratories for Advanced Decommissioning Science (CLADS), Japan Atomic Energy Agency (JAEA), has been conducting the Nuclear Energy Science & Technology and Human Resource Development Project (hereafter referred to "the Project") from FY2019. 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 FY2024, this report summarizes the research results of the "Human resource development for research based on fuel debris study and SEEM-ology buildup" conducted in FY2024. The present study aims to buildup of "Severe Engineering Management (SEEM)-ology" that enables more rational decision-making in an uncertain and severe environment, and at the same time, to develop research personnel supporting the academic foundation of the extraction, long-term storage, treatment and disposal of fuel debris, which is a central issue in the decommissioning of 1F. Experts in different fields promote multiple research and human resource development tasks in organic collaboration. In the first fiscal year of this study, it was necessary to clarify specific research methods and set the direction in the [SEEM Fields] [Specialized Fields 1
2] and [Common Engineering Fields 13], as well as to prepare various conditions for necessary tests and analyses. It was also necessary to promote the operation of educational programs related to nuclear decommissioning and the planning of SEEM-related courses. For this reason, the purpose of this fiscal year was to obtain the prescribed results by examining specific research methods and making various preparations for conducting necessary tests, preparing various conditions, building and analyzing some measurement systems, and examining human resource development. Based on this objective, we set the performance targets and implementation methods for this fiscal year as an operational plan, implemented them as planned, and were able to achieve the targeted results in each technical field and education and human resource development activities.
