Creep crack growth on spent fuel zircaloy cladding in interim storage |
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| Authors: | CK Chao JQ Chen KC Yang CC Tseng |
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| Institution: | aDepartment of Mechanical Engineering, National Taiwan University of Science and Technology, 43 Keelung Road, Section 4, Taipei 106, Taiwan, ROC;bNuclear Fuels and Materials Division, Institute of Nuclear Energy Research Taoyuan, 32546, Taiwan, ROC |
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| Abstract: | The effect of creep failure mechanisms on the creep crack growth is examined on spent fuel Zircaloy cladding in interim storage. Based on the creep fracture mechanics parameter C* and the strain energy density criteria, the relationship between the creep crack growth rate and the fracture mechanics parameter C* is established theoretically. The effects of initial crack lengths and storage temperature profiles on cladding failure are discussed in detail. The results show that the initial crack length and the storage temperature profile play an important role in the interim dry storage. When the storage temperature remains at a constant temperature of 400 °C, it will be safe for the cladding which stores in the interim dry storage. The results presented in this study provide a reliable cladding integrity evaluation for spent fuel in the interim dry storage. |
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| Keywords: | Creep Strain energy density Crack growth rate Spent fuel Zircaloy cladding |
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