Low-Activation Reinforced Concrete Design Methodology (9) — Low-Activation Concrete Based on Limestone Aggregates and White Cement—

摘要

Manufacturing tests regarding the 1/30-low-activation concrete for a nuclear power plant were performed. Here, "1/30-low-activation" concrete denotes that the activity reduction rate to the ordinary concrete is designed to be 1/30. The detailed data regarding the concentrations of Co and Eu in limestone, white cement, silica fume, and limestone powder were obtained The low-heat type of 1/30-low-activation concrete was developed by admixing with the low-activation limestone powder, and the low-heat type of 1/50-low-activation concrete was developed by admixing with the low-activation silica fume and/or the low-activation limestone powder. By admixing with the B_4C of which concentration is from 1 to 2.5 w%, the total residual radioactivity reduction ratio ofthe above low-activation concrete to the ordinary concrete, in ΣDi/Ci unit, is estimated to be from l/100to 1/1,500.