Modification of STACY for the study of criticality characteristics of fuel debris, 15; Reconsidering experimental core using debris structure material rods

Araki, Shohei   ; Gunji, Satoshi  ; Yoshikawa, Tomoki ; Arakaki, Yu; Izawa, Kazuhiko ; Suyama, Kenya

The first criticality of the statistical criticality assembly called "STACY", which JAEA has been modifying, is scheduled for 2024. After the first criticality, experiments using debris structure material rods are being prepared. At the spring 2023 annual meeting, we presented the results of a study on the core characteristics of the experimental core under the condition of using 900 fuel rods. However, it is requested to consider the core configuration with 400 fuel rods due to the fuel procurement. In this study, we reanalyzed the core with 400 fuel rods and confirmed that the core characteristics are included in that of the previous presentation.