, (U,Gd)O2和(U,Pu)O2颗粒的再烧结试验

[中文适用范围]： 本国际标准描述了一种用于测量UO2、(U,Gd)O2和(U,Pu)O2燃料pellet在规定条件下热处理后的致密化程度的方法。致密化是反应堆运行中燃料的重要设计特征，主要取决于结构参数如孔隙大小、孔隙分布、晶粒尺寸（以及对于(U,Gd)O2和(U,Pu)O2，氧化物相结构）。通过热重烧结试验可以表征pellet在高温下的尺寸行为。由于该试验的结果与烧结条件密切相关，因此需要利用相关规则进行结果关联。 [外文原描述]： ISO 15646:2014 describes a procedure for measuring the densification of UO 2 , (U,Gd)O 2 , and (U,Pu)O 2 pellets, achieved by heat treatment under defined conditions. The densification of fuel in power operation is an important design feature. Essentially, it is dependent on structural parameters such as pore size, spatial pore distribution, grain size, and in the case of (U,Gd)O 2 and (U,Pu)O 2 , oxide phase structure. A thermal re-sintering test can be used to characterize the dimensional behaviour of the pellets under high temperature. The results of this test are used by the fuel designer to predict dimensional behaviour in the reactor, because thermal densification in the reactor is also dependent on these structural parameters, albeit in a differing manner in terms of quantity.