Uncertainty Analysis of Manufacturer Parameters Impact on TVS-2M Fuel Rod Performance in Reactor

TVS-2M fuel will be deployed in the TIANWAN NPP Unit 3＆4 from the first batch. In traditional method, the predicted conservative fuel manufacturer parameters will be used to analyze the fuel rod performance under steady state condition for the first 8 fuel cycles, which includes 5 fuel rod design criteria. But this conservative evaluation method can neither reflect the realities of the real world, nor analyze the sensitivities of the manufacturer parameters. Therefore, by coupling DAKOTA and START-3 codes, GRS method is used to calculate the fuel performance and to analyze the uncertainty. After compared with the traditional method, the results reveal that the traditional method not only overestimate the fuel temperature and cladding stress, but also underestimate the axial and radial strain, and the sensitivities of cladding inner diameter and pellet outer diameter are significant for fuel rod criteria.