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介绍反应堆Ⅱ类瞬态下燃料棒芯块与包壳相互作用(PCI)分析方法和PCI热-力学计算理论模型,在此基础上对海南核电厂降功率燃料管理方案进行PCI评价,并对影响PCI失效裕量的因素进行分析。结果表明,所有瞬态条件下包壳的应变能密度与技术限值相比较都有裕量;瞬态局部线功率越大,瞬态发生前局部燃耗越深,PCI失效裕量越小;瞬态发生前,降功率时间越长,PCI失效裕量越小;降功率后再升功率,裕量得到一定程度恢复。
This paper introduces PCI analysis method and PCI thermo-mechanical calculation theory model of reactor Ⅱ transient fuel rod pellet and cladding, and then conducts PCI evaluation of Hainan nuclear power plant drop-power fuel management plan, PCI failure margin factor analysis. The results show that the strain energy density of the cladding under all transient conditions has a margin compared with the technical limits. The larger the transient local line power is, the deeper the local fuel consumption is before the transient occurs, and the smaller the PCI failure margin is. Before the transient occurs, the longer the power down time, the smaller the PCI failure margin; after lowering the power and then power, the margin has been restored to some extent.