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

  • 제16권4호
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  • Pages.455-472
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  • 2018
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  • 1738-1894(pISSN)
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  • 2288-5471(eISSN)
한국방사성폐기물학회 (Korean Radioactive Waste Society)
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미국의 건식저장 캐니스터에서의 CISCC 연구에 대한 검토

Review of Research on Chloride-Induced Stress Corrosion Cracking of Dry Storage Canisters in the United States

  • 투고 : 2018.06.07
  • 심사 : 2018.08.08
  • 발행 : 2018.12.31
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초록

국내의 사용후핵연료가 증가함에 따라 사용후핵연료 저장조는 곧 포화가 될 것으로 예상된다. 따라서 사용후핵연료 건식저장 운영 및 관리 방안에 대해 연구하는 것은 매우 중요하다. 미국에서는 오랜 기간 건식저장을 운영해왔으며 이를 바탕으로 사용후핵연료 건식저장 운영 및 관리 방안에 대해 많은 연구가 수행되고 있다. 그러나 우리나라에서는 경수로 사용후핵연료건식저장 경험이 없으며 관련 관리방안 및 구체적인 기준이 매우 부족한 현실이다. 건식저장기간 동안 주요한 이슈중의 하나는 건식저장용기 열화현상이며 대표적으로 응력부식균열에 의한 부식현상이 있다. 미국에서는 U.S. DOE, U.S. NRC, 그리고 EPRI 주관 아래 건식저장 캐니스터에서의 염화물 응력부식균열에 관한 많은 연구들을 수행하고 있다. 또한 건식저장 캐니스터의 염화물 응력부식균열 현상을 설명하기 위해 SNL에서는 확률론적 응력부식균열 모델을 제시하였다. 본 논문에서는 SNL에서 제시한 확률론적 응력부식균열 모델을 검토하였으며 모델에 제시된 주요인자들을 세세하게 분석하였다. 본 논문은 우리나라에서 스테인리스 스틸로 제작된 캐니스터를 경수로 사용후핵연료 건식저장으로 이용할 경우, 건식저장 운영 및 관리 방안을 구축하는 대에 좋은 참고문헌이 될 것이라 사료된다.

It is important to study how to manage dry storage casks of spent nuclear fuels (SNF), because wet storage spaces for SNF will shortly be at full capacity in the Republic of Korea. The US has operated a dry storage cask system for several decades, and has carried out significant studies into how to successfully manage dry storage cask for SNF. This type of expertise and experience is currently lacking in the Republic of Korea. The degradation of dry casks is an important issue that must be considered. In particular, chloride-induced stress corrosion cracking (CISCC) is known to lead to the release of radioisotopes from canisters. The U.S. Department of Energy, U.S. Nuclear Regulatory Commission, and the Electric Power Research Institute have undertaken research into the CISCC mechanism. In addition, Sandia National Laboratories (SNL) has extensively researched CISCC and how to manage it in dry storage canisters. In this review paper, the probabilistic model proposed by the SNL is analyzed and, based on this model, US-based CISCC research is reviewed in detail. This paper will inform the management of dry cask storage of SNF from light water reactors in austenite stainless steel canisters in the Republic of Korea.

키워드

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