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Korean Journal of Metals and Materials > Volume 56(2); 2018 > Article
Korean Journal of Metals and Materials 2018;56(2): 79-92. doi: https://doi.org/10.3365/KJMM.2018.56.2.79
장기 건식저장 사용후핵연료 지르코늄 합금 피복관 내 수소화물 재배열 현상 영향 인자들에 대한 고찰
이지민1, 김호아1, 국동학2, 김용수1
1한양대학교 원자력공학과
2한국원자력연구원 경수로핵연료기술개발부
A Review of Factors Influencing the Hydride Reorientation Phenomena in Zirconium Alloy Cladding During Long-Term Dry Storage
Ji-Min Lee1, Ho-A Kim1, Dong-Hak Kook2, Yong-Soo Kim1
1Dept. of Nuclear Engineering, Hanyang University, Seoul 04763, Republic of Korea
2Korea Atomic Energy Research Institute, Daejeon 34057, Republic of Korea
Correspondence  Yong-Soo Kim ,Tel: +82-2-2220-0462, Email: yongskim@hanyang.ac.kr
Received: 30 October 2017;  Accepted: 27 November 2017.  Published online: 5 February 2018.
ABSTRACT
Zirconium-based alloys, widely used for nuclear fuel cladding, are highly susceptible to hydrideinduced embrittlement. The degree of the hydride embrittlement is strongly affected by not only its concentration but also its morphology. The hydride can drastically reduce the mechanical properties of the cladding, especially when it is radially precipitated. Recently it has been reported that circumferential hydrides can re-precipitate into radial hydrides if applied hoop stress in the cladding exceeds a certain limit, so-called threshold stress, during the long-term dry storage of spent nuclear fuel. This hydride reorientation phenomenon is now considered as one of the most critical issues in the nuclear fuel industry, threatening cladding integrity during the steady state storage period as well as transportation of spent nuclear fuel. In fact, the phenomenon is known to be quite complex, and affected by numerous factors. In this paper, the major influential factors affecting reorientation issues, namely temperature, stress, number of thermal cycles, cooling rate, and hydrogen concentration, are reviewed. In addition, recent studies on the synergistic effects of the factors on the threshold stress triggering the reorientation are discussed in detail. Finally, summarizing conclusions for mechanistic understanding are drawn and recommendations for future work are made.
Keywords: zirconium alloy cladding, zirconium hydride, hydride reorientation, threshold stress
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