ISO 15646:2014 二氧化铀、二氧化（铀、钆）和二氧化（铀、钚）芯块复烧结试验

标准编号：ISO 15646:2014

中文名称：二氧化铀、二氧化（铀、钆）和二氧化（铀、钚）芯块复烧结试验

英文名称：Re-sintering test for UO2, (U,Gd)O2 and (U,Pu)O2 pellets

发布日期：2014-06

标准范围

This International Standard describes a procedure for measuring the densification of UO2, (U,Gd)O2,and (U,Pu)O2 pellets, achieved by heat treatment under defined conditions.The densification of fuel in power operation is an important design feature. Essentially, it is dependenton structural parameters such as pore size, spatial pore distribution, grain size, and in the case of (U,Gd)O2 a nd ( U,Pu)O2, oxide phase structure. A thermal re-sintering test can be used to characterize thedimensional behaviour of the pellets under high temperature. The results of this test are used by the fueldesigner to predict dimensional behaviour in the reactor, because thermal densification in the reactor isalso dependent on these structural parameters, albeit in a differing manner in terms of quantity.On the assumption of the prediction, it is necessary to correlate the results of this test by somecorrelation rules, because the results of this test vastly depend on the re-sintering conditions (such asheat treatment temperature, treatment time, gas content, and partial oxygen pressure).

标准预览图