Estimation method of young's modulus of radioactive contaminant adsorbent (Elasticity evaluation of aggregates based on single unit evaluation)

In nuclear power plants, adsorbent materials for radioactive contaminants are installed as a precautionary measure in case of a severe accident, such as the leakage of radioactive substances. These adsorbents remain stored and maintained during normal plant operation and are only used in emergency situations. This study focuses on the elastic deformation of an adsorbent composed of radioactive adsorbent particles fixed within a cloth. In practical applications, these adsorbents are enclosed in a net to form a large aggregate. Young’s modulus is a key mechanical property for loading the adsorbent aggregate into a drainage pit, as deformation can reduce the fluid passage section for contaminated water. In this paper, Young’s modulus of an adsorbent is experimentally determined, and that of the aggregate is estimated using two approaches: the constant stress model and the constant strain model. The estimated results are then compared with experimental findings from the adsorbent aggregate. The constant stress model provides better estimates than the constant strain model. Based on these results, the deformation behavior of an adsorbent aggregate can be predicted from that of a single adsorbent, eliminating the need to construct large aggregates for testing.