Due to more and more studies were made on fuel and clad failure mode in international nuclear industry, some acceptance criteria of rod ejection accident should be revised in order to consider the fuel and cladding behavior change caused by radiation. Furthermore, along with the rapid development of computer hardware and improvement in physics analysis methodology, it is necessary and it is capable to use three-dimensional method to perform rod ejection accident analysis in order to relax some conservatism. In this paper, 3D method has been applied to AP1000 equilibrium core load pattern to perform fuel temperature and fuel enthalpy analysis.

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