Development of Software for Preparing Documents for IAEA Random Inspections in Safeguards

Shibata, Akira; Sugaya, Naoto; Nishimura, Arashi; Watahiki, Shunsuke

JAEA-Technology 2026-014, 36 Pages, 2026/08

JAEA-Technology-2026-014.pdf:1.23MB

At the 6th Safeguards Committee Meeting of FY2025, deficiencies in documents for IAEA random inspections were discussed, and, to prevent recurrence, the issue was shared with JOYO, DCA, FMF, and JMTR. At JMTR, IAEA random inspections are conducted with two hours advance notice on the inspection morning. This requires accurate preparation of documents shortly after work starts. One required document is a graph of reactor outlet temperature, inlet temperature and main pump output. Previously, this graph was prepared using Argus data collected from Centum. However, Argus became unusable due to malfunctions. During the random inspection on 18 July 2025, one-hour interval data were manually transcribed from Centum into Excel to create the graph. This method uses coarse data, takes time and may cause errors. Therefore, software was developed to generate inspection graphs rapidly and reliably. A data extraction tool was also developed to simplify retrieval of reactor data from Centum.

Implementation of a Mini-slab-based neutron detector system to increase the efficiency of safeguards verification of hold-up at MOX fuel fabrication facilities in Japan

Kyffin, J.*; Dia, A.*; Nkosi, G.*; Nizhnik, V.*; Hayashi, Akihiko; Nagatani, Taketeru

Proceedings of 65th Annual Meeting of the Institute of Nuclear Materials Management (Internet), 8 Pages, 2024/07

Comparing DGSMC, FIER, and FISPACT simulations to experimental delayed gamma-ray spectra for nuclear safeguards development

Rodriguez, D. C.; Rossi, F.; Takahashi, Tone

IEEE Transactions on Nuclear Science, 71(3), p.255 - 268, 2024/03

https://doi.org/10.1109/TNS.2024.3353816

Design and characterization of the fission signature assay instrument for nuclear safeguards

Rossi, F.; Koizumi, Mitsuo; Rodriguez, D. C.; Takahashi, Tone

Proceedings of INMM & ESARDA Joint Annual Meeting 2023 (Internet), 5 Pages, 2023/05

Efforts for appropriate responses to safeguards activities, 1; Overview

Aoki, Rie; Shirafuji, Masaya; Nozaki, Teo; Akutsu, Narumi*; Miyaji, Noriko; Nakamura, Hironobu

Proceedings of INMM & ESARDA Joint Annual Meeting 2023 (Internet), 7 Pages, 2023/05

New design of a delayed gamma-ray spectrometer for safeguards verification of small mixed nuclear material samples

Rossi, F.; Koizumi, Mitsuo; Rodriguez, D. C.; Takahashi, Tone

Proceedings of 2022 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room Temperature Semiconductor Detector Conference (2022 IEEE NSS MIC RTSD) (Internet), 2 Pages, 2022/11

Developing delayed gamma-ray spectroscopy for nuclear safeguards; Project overview and analysis development

Rodriguez, D. C.; Abbas, K.*; Koizumi, Mitsuo; Nonneman, S.*; Oberstedt, S.*; Pedersen, B.*; Rossi, F.; Schillebeeckx, P.*; Takahashi, Tone

Proceedings of INMM 63rd Annual Meeting (Internet), 9 Pages, 2022/09

Study of rational safeguards for the treatment of radioactive waste containing nuclear materials

Nakatani, Takayoshi; Shimizu, Ryo; Tazaki, Makiko; Kimura, Takashi; Tamai, Hiroshi; Suda, Kazunori

Dai-42-Kai Nihon Kaku Busshitsu Kanri Gakkai Nenji Taikai Kaigi Rombunshu (Internet), 4 Pages, 2021/11

Currently, JAEA is in the advancing of decommissioning own nuclear facilities, and some facilities have been handling nuclear materials. In decommissioning, it is necessary to consider rational methods while keeping nuclear non-proliferation and transparency, including treatment of radioactive waste generated from these facilities and methods for terminating safeguards. In this study, we considered the above issues regarding waste treatment with reference to the guidance of Safeguards by Design (SBD) published by the International Atomic Energy Agency (IAEA).

Developing delayed gamma-ray spectroscopy for reprocessing plant nuclear safeguards; Fissile nuclide content analysis

Rodriguez, D. C.; Abbas, K.*; Koizumi, Mitsuo; Lee, H.-J.; Nonneman, S.*; Pedersen, B.*; Rossi, F.; Takahashi, Tone

Proceedings of 2021 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) (Internet), 3 Pages, 2021/10

https://doi.org/10.1109/NSS/MIC44867.2021.9875724

Evaluation of high-energy delayed gamma-ray spectra dependence on interrogation timing patterns

Rodriguez, D. C.; Bogucarska, T.*; Koizumi, Mitsuo; Lee, H.-J.; Pedersen, B.*; Rossi, F.; Takahashi, Tone; Varasano, G.*

Nuclear Instruments and Methods in Physics Research A, 997, p.165146_1 - 165146_13, 2021/05

https://doi.org/10.1016/j.nima.2021.165146