Modification of STACY for the study of criticality characteristics of fuel debris, 19; Evaluation of the effect of material uncertainty of concrete simulants on the critical water height

Gunji, Satoshi  ; Araki, Shohei   ; Arakaki, Yu; Izawa, Kazuhiko 

In the experiment to evaluate the criticality characteristics of fuel debris using STACY, rod-shaped simulants will be made of mortar composition to simulate the concrete assumed to be contained in the fuel debris. For that cases, it is necessary to evaluate the effect of composition-related uncertainties on critical experiments. In this study we performed computations in which the contents of water, silica, and lime, which are the main components of the simulants, were perturbed, and the effect on the critical water level was investigated. As a result, it was confirmed that there was no significant effect within the manufacturing tolerance of the simulants.