Uncertainty Analysis of Manufacturer Parameters Impact on TVS-2M Fuel Rod Performance in Reactor
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摘要: 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。Abstract: 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.
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Key words:
- GRS method /
- Uncertainty /
- Manufacturer parameter /
- Steady state performance /
- Fuel rod /
- TVS-2M
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