Abstract 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., CaCl2 and MgCl2) 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.

中文翻译：

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不同环境条件下干储系统氯化物应力腐蚀开裂裂纹扩展评价

摘要 焊接式可运输储存罐（TSC）上的温度和湿度的详细信息是研究长期储存氯化物引起的应力腐蚀开裂（CISCC）的最有价值的数据。氯化盐在特定情况下会潮解，这取决于现场条件（例如环境温度和相对湿度 (RH)）和桶条件（例如装载模式和热负荷）。本研究旨在使用计算流体动力学 (CFD) 模拟在不同环境条件下含有氯化物海盐（例如 CaCl2 和 MgCl2）的海洋环境，评估候选 TSC 材料对 CISCC 的敏感性。使用 CFD 模拟进行验证后，发现 2-D 和 3-D 模型之间的温度偏差最小。因此，开发了一个高精度的二维模型来加速仿真，主要是因为CISCC的存储时间长达20年，整个许可期限为40年。结果表明，只有长期环境温度对组件有相当大的影响。随着 SNF 的衰变热导致 TSC 的温度升高，RH 会降低。在原20年的许可期内，TSC底部边缘的最大累积裂纹深度不会超过0.25毫米/年。发生在 TSC 表面的 CISCC 位置高度低于 0.18 m，并且每十年检查一次表面足以确保 TSC 的完整性。除了支持我们的长期结构完整性重新检查方法外，这项研究还提供了一种减少重新检查负荷的替代方法。