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田湾核电站3、4号机组计划从首炉堆芯开始使用TVS-2M燃料。为了对前8个燃料循环中燃料棒稳态性能进行验证,根据保守性燃料制造参数进行选择,利用START-3程序开展了5个设计准则上的燃料棒性能校验工作。但是,上述传统方法的保守性并未得到验证,而且也无法开展燃料制造参数的敏感性研究。为此,将DAKOTA与START-3程序耦合,利用统计类的GRS方法,对田湾核电站3、4号机组中的TVS-2M燃料棒稳态性能的不确定性开展计算分析。结果表明:传统方法在燃料温度与包壳应力方面过于保守,而在包壳的轴向和径向应变方面则保守性不足;在燃料制造参数的敏感性方面,包壳内径和芯块外径的敏感度价值普遍较高;此外,燃料密度对燃料温度和燃料棒内压有较大影响。
Units 3 and 4 of Tianwan NPP plan to start using TVS-2M fuel from the first reactor core. In order to validate the fuel rod steady-state performance in the first eight fuel cycles, the fuel efficiency parameters were selected based on the conservative fuel manufacturing parameters, and the fuel rod performance calibration on five design criteria was carried out using the START-3 program. However, the conservative nature of the above traditional methods has not been validated, and the sensitivity of fuel manufacturing parameters can not be studied. To this end, the DAKOTA and START-3 program are coupled to calculate and analyze the uncertainty of the steady state performance of the TVS-2M fuel rods in Tianwan NPP Unit 3 and Unit 4 using the statistical GRS method. The results show that the traditional method is too conservative in terms of fuel temperature and cladding stress, but conservative in the axial and radial strain of the cladding. In the sensitivity of fuel fabrication parameters, the inner diameter of the cladding and the outer diameter of the core Of the sensitivity value is generally higher; In addition, the fuel density on the fuel temperature and fuel rod pressure have a greater impact.