Mechanical Properties of Cubic (U,Zr)O2
Mechanical Properties of Cubic (U,Zr)O2
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立方(U,Zr)O2的机械性能
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
K. Koizumi
中科院分区：
文献类型：
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作者：
T. Kitagaki;T. Hoshino;K. Yano;N. Okamura;H. Ohara;T. Fukasawa;K. Koizumi
需要对福岛第一核电站（1F）的燃料碎片特性进行评估，以开发燃料碎片清除工具。在清除 TMI-2 事故产生的碎片过程中，取芯系统发挥了重要作用。考虑到岩心钻探的工作原理，硬度、弹性模量和断裂韧性被发现是重要的燃料碎片特性，深刻影响钻探机的性能。据推测，铀和锆氧化物固溶体(U,Zr)O2是1F燃料碎片中的主要物质之一。此外，由于 1F 反应堆是沸水反应堆 (BWR)，因此 1F 燃料碎片中的 Zr 含量预计将高于 TMI-2 中的碎片。在本研究中，评估了含有 10%-65% ZrO2 的立方 (U,Zr)O2 样品的机械性能。硬度、弹性模量和断裂韧性分别通过维氏试验、超声波脉冲回波法和压痕断裂法测量。对于ZrO2含量低于50%的(U,Zr)O2样品，随着ZrO2含量的增加，维氏硬度和断裂韧性增加，弹性模量略有下降。此外，与含有 55% ZrO2 的 (U,Zr)O2 样品相比，含有 65% ZrO2 的 (U,Zr)O2 样品的所有这些值略有增加。在ZrO2含量低于10%的样品中，ZrO2含量显着影响断裂韧性。较高的Zr含量（超过50%）对力学性能影响不大。
Evaluation of fuel debris properties in the Fukushima Daiichi Nuclear Power Plant (1F) is required to develop fuel debris removal tools. In the removal of debris resulting from the TMI-2 accident, a core-boring system played an important role. Considering the working principle of core boring, hardness, elastic modulus, and fracture toughness were found to be important fuel debris properties that profoundly influenced the performance of the boring machine. It is speculated that uranium and zirconium oxide solid solution (U,Zr)O2 is one of the major materials in the fuel debris from 1F. In addition, the Zr content of the fuel debris from 1F is expected to be higher than that of the debris from TMI-2 because the 1F reactors were boiling-water reactor (BWR). In this research, the mechanical properties of cubic (U,Zr)O2 samples containing 10%¬-65% ZrO2 are evaluated. The hardness, elastic modulus, and fracture toughness are measured by the Vickers test, ultrasonic pulse echo method, and indentation fracture method, respectively. In case of the (U,Zr)O2 samples containing less than 50% ZrO2, Vickers hardness and fracture toughness increased, and the elastic modulus decreased slightly with increasing ZrO2 content. Moreover, all of those values of the (U,Zr)O2 samples containing 65% ZrO2 increased slightly compared to (U,Zr)O2 samples containing 55% ZrO2. ZrO2 content affects fracture toughness significantly in the case of samples containing less than 10% ZrO2. Higher Zr content (exceeding 50%) has little effect on the mechanical properties.