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

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

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.