Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT) (방사성폐기물학회지)

Korean Radioactive Waste Society (한국방사성폐기물학회)
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Surface Engineering Technologies to Mitigate Chloride-Induced Stress-Corrosion Cracking in Stainless Steel Dry Cask Storage Containments for Used Nuclear Fuel

  • Received : 2024.06.18
  • Accepted : 2024.08.14
  • Published : 2024.09.30
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Abstract

Interim dry cask storage systems comprising AISI 304 or 316 stainless steel canisters have become critical for the storage of spent nuclear fuel from light water reactors in the Republic of Korea. However, the combination of microstructural sensitization, residual tensile stress, and corrosive environments can induce chloride-induced stress corrosion cracking (CISCC) for stainless steel canisters. Suppressing one or more of these three variables can effectively mitigate CISCC initiation or propagation. Surface-modification technologies, such as surface peening and burnishing, focus on relieving residual tensile stress by introducing compressive stress to near-surface regions of materials. Overlay coating methods such as cold spray can serve as a barrier between the environment and the canister, while also inducing compressive stress similar to surface peening. This approach can both mitigate CISCC initiation and facilitate CISCC repair. Surface-painting methods can also be used to isolate materials from external corrosive environments. However, environmental variables, such as relative humidity, composition of surface deposits, and pH can affect the CISCC behavior. Therefore, in addition to research on surface modification and coating technologies, site-specific environmental investigations of various nuclear power plants are required.

Keywords

Acknowledgement

Following are results of a study on the "Leaders in INdustry-university Cooperation 3.0" Project, supported by the Ministry of Education and National Research Foundation of Korea. This paper is a result of The Human Resources Development Project for HLW Management hosted by KORAD and MOTIE. This research was conducted by funding from The Circle Foundation (Republic of Korea) for 1years since December 2023 as Research center for clean hydrogen production technology linked to energy plants selected as the '2023 The Circle Foundation Innovative Science Technology Center (Grant Number : 2023 TCF Innovative Science Project-02).

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