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首页> 外文期刊>Journal of Nuclear Materials: Materials Aspects of Fission and Fusion >HIGH RESOLUTION TEM OF HIGH BURNUP UO2 FUEL
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HIGH RESOLUTION TEM OF HIGH BURNUP UO2 FUEL

机译：高燃态UO2燃料的高分辨率TEM。

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摘要

High-resolution TEM (HRTEM) observations and nano-area EDX analyses were carried out on small intragranular bubbles in the outer region of high burnup UO2 pellets. Sample was prepared from the outer region of UO2 pellet, which had been irradiated to the pellet average burnups of 49 GWd/t in a BWR. HRTEM observations and element analyses were made with a 200 KV cold-type field emission TEM (Hitachi FE-2000) having an ultra-thin window EDX (Noran Voyager). Lattice image and nano-area EDX results indicate the presence of 4-8 nm size Xe-Kr bubbles along with fission products of five metal particles, Mo-Tc-Ru-Rh-Pd. Nano-diffraction patterns from bubbles show two different new patterns besides matrix UO2. From the Xe/U proportion obtained by nano-area EDX peak and nano-diffraction patterns from bubbles, it was concluded that Xe in the small bubbles was present in a solid or near solid state at very high pressure. Furthermore, from the results of high resolution images and diffractions obtained from recrystallized grains in rim structure region, neighboring recrystallized grains were clarified to be present with high angle grain boundaries. (C) 1997 Elsevier Science B.V. [References: 14]
机译：对高燃耗UO2颗粒外部的小颗粒内气泡进行了高分辨率TEM（HRTEM）观察和纳米区域EDX分析。从UO2颗粒的外部制备样品，该样品已在BWR中辐照至颗粒平均燃耗为49 GWd / t。 HRTEM观察和元素分析是使用200 KV具有超薄窗口EDX（Noran Voyager）的冷场发射TEM（日立FE-2000）进行的。格子图像和纳米区域EDX结果表明，存在4-8 nm尺寸的Xe-Kr气泡以及五个金属颗粒Mo-Tc-Ru-Rh-Pd的裂变产物。气泡的纳米衍射图谱显示了除基质UO2之外的两种不同的新图谱。从通过纳米区域EDX峰获得的Xe / U比例和气泡的纳米衍射图可以得出结论，小气泡中的Xe在非常高的压力下呈固态或接近固态存在。此外，从高分辨率图像的结果和从边缘结构区域中的再结晶晶粒获得的衍射的结果来看，澄清了相邻的再结晶晶粒存在高角度晶界。 （C）1997 Elsevier Science B.V. [参考：14]

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