Three Dimensionnal Simulation Investigation of Wedged Pellet-Clad Interaction Problem in Fuel Rod
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摘要: 燃料芯块与包壳的相互作用（PCI）是导致包壳破损的原因之一。燃料芯块开裂产生的碎片可能夹在芯块与包壳的间隙，导致夹楔PCI问题。该问题可能致使包壳局部应力超过限值，增加包壳破损风险。为评估夹楔PCI问题对燃料棒性能的影响，基于多物理耦合有限元平台MOOSE，建立三维有限元燃料元件性能分析方法，综合考虑辐照效应和热力耦合作用，针对单芯块模型完成了夹楔PCI问题的数值模拟计算。结果表明，夹楔PCI问题会改变包壳中的温度分布、应力分布和应变分布，并会增加包壳中的最大Mises应力和等效蠕变应变，增大燃料棒失效风险。
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关键词:
- 燃料棒 /
- 芯块与包壳相互作用(PCI) /
- 夹楔 /
- 多物理耦合有限元平台(MOOSE)
Abstract: The pellet-clad interaction (PCI) is one of the reasons leading to breach of cladding. The fracture generated by pellet cracking could wedge into the gap between pellet and caldding, resulting the wedged PCI problem. This problem may cause the local stress of the cladding to exceed the limit value and increase the risk of cladding damage. In order to evaluate the influence of wedged PCI on the performance of fuel rods, a three-dimensional finite element fuel element performance analysis method was established based on MOOSE, a multi-physical coupling finite element platform. In this method, the radiation effect and thermal-mechanical coupling effect are considered comprehensively, and the numerical simulation of wedged PCI problem is completed for the single pellet model. The results show that the wedged PCI problem can change the temperature distribution, stress distribution and strain distribution of the cladding, increase the maximum Mises stress and equivalent creep strain of the cladding, and increase the risk of fuel rod failure. -
图 3 升功率结束时发生夹楔时包壳温度分布
Figure 3. Temperature Distribution of Wedged Cladding after Power Ramp
图 4 升功率结束时发生夹楔时包壳Mises应力分布
Figure 4. Distribution of Mises Stress of Wedged Cladding after Power Ramp
图 5 升功率结束时有夹楔的包壳等效蠕变分布
Figure 5. Distribution of Equivalent Creep Strain of Wedged Cladding after Power Ramp
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