(一)国外研究 PCI 问题的历史背景及重要意义所谓燃料元件的 PCI(pellet and clad-ding interaction)是指水冷动力反应堆所使用的燃料元件芯块与包壳之间的相互作用。由于 PCI 作用可导致元件破损,因而引起了国外的重视。也就是说,PCI 问题直接涉及到燃料元件在堆内使用的安全性,同时也关系到水冷堆核电站的经济性。众所周知,国外目前运行着的核电站绝 (A) the historical background and significance of the foreign study of PCI issues The so-called pellet and clad-ding interaction (PCI) refers to the interaction between the fuel element pellets and cladding used in water-cooled power reactors. As the role of PCI can lead to component damage, which attracted the attention of foreign countries. In other words, the PCI issue is directly related to the safety of fuel components used in the reactor, but also relates to the economy of the water-cooled reactor nuclear power plant. As we all know, foreign nuclear power plants currently running must