Surface Engineering Technologies to Mitigate Chloride-Induced StressCorrosion Cracking in Stainless Steel Dry Cask Storage Containments for Used Nuclear Fuel

• 발행기관: 한국방사성폐기물학회
• 저자명: Jinwook Choi Kumar Sridharan Hwasung Yeom
• 간행물 정보: 『Journal of Nuclear Fuel Cycle and Waste Technology (JNFCWT)』Vol.22 No.3, 325~338쪽, 전체 14쪽
• 주제분류: 공학 > 공학일반
• 파일형태: PDF
• 발행일자: 2024.09.30

국문 초록

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

키워드

Dry cask storage system Peening Burnishing Cold-spray coating