The decay heat removal analysis is considered as one of the four items of dry storage system safety analysis in addition to criticality analysis, confinement analyses and radiation protection analysis. This paper has illustrated the related standards and rules to be followed, and demonstrated the CFD simulation of a vertical spent fuel dry storage cask. Furthermore, the thermal analysis is applied in developing new materials, and the optimization of loading schemes in one operation. The above applications have proved that thermal analysis plays critical role in the design and operation of spent fuel dry storage system.

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