Thermal expansion analysis of concrete spent nuclear fuel dry storage developed in Korea

SNF dry storage facility is temporary storage stage before the SNF is reprocessed or moved to final disposal facility. For that reason, the SNF has to be Concrete SNF dry storage component can be expanded when SNF is loaded because of decay heat of the SNF. In this paper it is evaluated how much SNF dry storage is expanded at the different conditions. According to evaluation result, it seems that canister shell cannot maintain retrievable condition in this off-normal condition. Therefore, thermal expansion effect needs to be considered in safety analysis importantly