摘要
Detailed information of temperature and humidity on the welded transportable storage canister (TSC) is the most valuable data available for investigating the chloride-induced stress corrosion cracking (CISCC) of long-term storage. Chloride salts turn deliquescent in specific situations, depending on the site condition (e.g., the environmental temperature and relative humidity (RH)) and cask condition (e.g., loading pattern and thermal load). This study aimed to evaluate the susceptibility to CISCC of the candidate TSC material using a computational fluid dynamics (CFD) simulation of a marine environment containing chloride sea salts (e.g., CaCl 2 and MgCl 2 ) under different environmental conditions. After validation using CFD simulation, the temperature deviation between 2-D and 3-D models was found to be minimal. Thus, a highly accurate 2-D model was developed to accelerate the simulation, mainly because the storage time of CISCC is up to 20 years, and the whole license period lasts 40 years. Results showed only the long-term environmental temperature had a considerable impact on the components. RH decreases as the temperature of TSC increases by decay heat from SNFs. The maximum accumulated crack depth on the bottom edge of TSC will not be over than 0.25 mm/year in the original 20-year licensing period. The location of CISCC occurring on the TSC surface was lower than 0.18 m in height and that inspecting the surface once a decade is sufficient to ensure the integrity of the TSC. As well as supporting our re-inspection method of long-term structural integrity, this study also provide an alternative way to reduce re-inspection load.