弥散陶瓷燃料颗粒开裂行为及数值模拟

Due to the very high inherent safety, ceramic-dispersion metal (cermet ) fuel will be widely used in nuclear power plants. The critical temperature for abnormal swelling of irradiated cermet fuel during annealing is a key index for the in-pile irradiation behavior. The fracture of the ceramic fuel particles is the auspice for abnormal swelling for cermet fuel and plays a very important role in the relationship between microstructure and element failure. So the numerical simulation and fracture behavior of dispersion ceramic particles are the fundamental problems in nuclear fuel science and technology. On the base of our experiment results, this project will conceive a modeling for the fracture of UO2 fuel particles in Zr matrix and establish a numerical simulation method. The effect of the factors such as the burn-up, the size and the distribution of fission gas bubbles in UO2, the mechanical properties of zirconium alloy, the mean size and the distribution of UO2 particle , on the fracture behavior of fuel particle will be investigated in detail.

金属基陶瓷弥散型燃料的固有安全性极高,在水冷动力堆中有广阔的应用前景. 退火起泡温度是评价金属基弥散燃料堆内辐照行为的核心指标,燃料颗粒的开裂又是退火起泡中的首要环节,是燃料微观结构与宏观性能之间的关系桥梁.因此,燃料颗粒的开裂行为及数值模拟是核燃料研究中的前沿基础问题，科学意义和应用意义巨大。本项目在金属基燃料辐照后退火起泡实验的现象规律基础上,以Zr-UO2弥散燃料为主要对象, 建立辐照后退火过程中UO2燃料颗粒开裂的数理模型和计算方法,藉此系统深入分析影响金属基弥散燃料退火起泡温度的因素、规律和机理。研究结果将对水冷动力堆金属基弥散燃料的研究发展以及对核燃料科学技术的进步起巨大的推进作用.

金属基陶瓷弥散型燃料的固有安全性极高,在水冷动力堆中有广阔的应用前景. 退火起泡温度是评价金属基弥散燃料堆内辐照行为的核心指标,燃料颗粒的开裂又是退火起泡中的首要环节,是燃料微观结构与宏观性能之间的关系桥梁.因此,燃料颗粒的开裂行为及数值模拟是核燃料研究中的前沿基础问题，科学意义和应用意义巨大。本项目在金属基燃料辐照后退火起泡实验的现象规律基础上,以UO2弥散燃料为主要对象, 建立了辐照后退火过程中UO2燃料颗粒开裂的数理模型和计算方法,并藉此模型深入分析影响金属基弥散燃料退火开裂温度的因素、规律和机理。研究结果将对水冷动力堆金属基弥散燃料的研究发展以及对核燃料科学技术的进步具有巨大的推进作用.