| Summary: | 碩士 === 國立臺灣科技大學 === 機械工程系 === 94 === This study focuses on the failure analysis of the spent fuel claddings during the stage between initial disposal and interim dry storage. For the spent fuel claddings, there are three disposals including initial disposal (cooling in sink), interim dry storage and final disposal (deep burying). But up to now, only the disposal with interim dry storage is considered in Taiwan. In general, disposing the spent fuel claddings needs three operate-day (about 72 hours) to store between initial disposal and interim dry storage.
Our purpose in the present study is to perform the degradation analysis of the spent fuel cladding in 72 hours between initial disposal and interim dry storage. A finite element software, ANSYS, is used to analyze the spent fuel claddings by considering the factors such as initial crack lengths, crack locations, hydride orientation, grow into hydride and ungrow into hydride. Beside, three different working conditions are also considered in this study including ISG-11 regulation, claddings at normal condition and claddings at accident condition.
The stress intensity factor is evaluated for these three working conditions which is used as a failure criterion in the present study. This study has established a reliable cladding integrity evaluation for the spent fuel claddings during the stage between initial disposal and interim dry storage.
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