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首页> 外文期刊>Journal of Nuclear Materials: Materials Aspects of Fission and Fusion >Post-irradiation examination of high burnup Mg doped UO2 in comparison with undoped UO2, Mg-Nb doped UO2 and Ti doped UO2
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Post-irradiation examination of high burnup Mg doped UO2 in comparison with undoped UO2, Mg-Nb doped UO2 and Ti doped UO2

机译：与未掺杂的UO2，Mg-Nb掺杂的UO2和Ti掺杂的UO2相比，高燃耗Mg掺杂的UO2的辐照后检查

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The pellets of UO2, magnesium doped UO2 (Mg-UO2). magnesium and niobium doped UO2 (Mg-Nb-UO2) and titanium doped UO2 (Ti-UO2) were irradiated to burnups ranging from 19 to 94 GWd/tU at temperatures 550-930 degreesC. The solubility of magnesium in UO2 was low around 2 mol%. The addition of magnesium and titanium caused to form large grain sized pellet on sintering. The swelling of pellets during irradiation was unchanged by magnesium addition below 60 GWd/tU in agreement with the literature rate for UO2. The thermal conductivity Of Unirradiated Mg-UO2 was higher than that of undoped UO2, which seemed to also hold for irradiated specimens. Pellet fracturing occurred by irradiation mainly by thermal stress. The undoped and metal doped UO2 pellets in the 84-94 GWd/tU range at the irradiation temperatures of 560-640 degreesC showed large bubbles and sub-divided grains of sub-micron size and the rim structure formation all over the surface. The xenon release from the pellets during irradiation increased with increasing burnup. In the fuels of close burnups, the xenon release increased rapidly with increasing temperature above about 600 degreesC. At high burnups, the effect of metal addition seemed to recede unclear perhaps due to the formation of heavily damaged fuel matrix. (C) 2001 Elsevier Science B.V. All rights reserved. [References: 60]
机译：UO2的颗粒，镁掺杂的UO2（Mg-UO2）。在550-930℃的温度下，将掺杂镁和铌的UO2（Mg-Nb-UO2）和掺杂钛的UO2（Ti-UO2）辐照至燃耗范围为19至94 GWd / tU。镁在UO 2中的溶解度低至约2mol％。镁和钛的添加导致在烧结时形成大晶粒尺寸的粒料。低于60 GWd / tU的镁添加量与UO2文献报道的速率一致，因此辐照期间颗粒的溶胀没有改变。未辐照的Mg-UO2的热导率高于未掺杂的UO2，这似乎也适用于辐照的样品。球团破裂主要是由热应力引起的。 84-94 GWd / tU范围内的未掺杂和金属掺杂的UO2颗粒在560-640摄氏度的辐照温度下显示出大的气泡和亚微米级的细分晶粒，并且在整个表面形成了边缘结构。辐照过程中小球中氙的释放随着燃耗的增加而增加。在接近燃尽的燃料中，氙气的释放随着温度升高至约600摄氏度以上而迅速增加。在燃耗很高的情况下，添加金属的作用似乎已消失，这可能是由于严重损坏的燃料基质的形成所致。 （C）2001 Elsevier Science B.V.保留所有权利。 [参考：60]

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