UO<sub>2</sub>弥散型燃料辐照后高温失效时显微分析

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UO₂弥散型燃料辐照后高温失效时显微分析

基金项目:

四川省青年基金(08ZQ026-024)

National Key Laboratory for Nuclear Fuel and Materials, Nuclear Power Institute of China, Chengdu, 610041, China

摘要: 对辐照后燃料板进行退火试验,用显微镜观察了UO₂颗粒的微观形貌随着温度的升高的变化情况。在高温下裂变气体膨胀,在UO₂颗粒内气孔贯通形成裂纹穿破涂层,引起UO₂颗粒局部破碎脱落,UO₂涂层外的反应层由于高温加剧的扩散反应还形成了明显的孔洞。
- 弥散燃料 /
- 辐照 /
- 高温失效 /
- 显微形貌
Abstract: The blister annealing has been performed on UO₂ dispersed fuel plate under various tempera-ture conditions.The microstructure of UO₂ particles changing with the rise of temperature is studied by using the microscope.Fission gas releases at high temperature and the bubbles burst the coat to generate cracks and result in the local fracture and fall off of UO₂ particles.A lot of holes occur in the reaction layer outside of UO₂ coat because of the diffusion reaction intensified by the high temperature.
- Dispersed fuel /
- Irradiation /
- High temperature failure /
- Microstructure