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通过开展调研与分析,结合我国研究堆实际,研究板状燃料元件流道堵塞事故预防措施和事故探测方法,为以板状燃料元件为燃料的研究堆的安全运行和安全监督管理提供技术支持。研究表明,堵流事故的发生大都是由于异物进入流道或燃料肿胀造成,反应堆功率提升时,堵塞的流道内燃料组件温度上升,冷却剂开始发生沸腾,功率会发生明显波动,因此增强中子注量率、功率的监控和燃料温度的分析对于预防堵流事故是非常重要的。结合中国先进研究堆(CARR)的实际,利用RELAP程序,很好地模拟了部分堵流和全部堵
Through research and analysis, combined with the actual situation of China’s research reactors, the paper studies the precautionary measures and accident detection methods for clogging of plate-shaped fuel elements, and provides technical support for the safe operation and safety supervision of plate-shaped fuel elements as research reactors. The results show that most of the blockage accidents are caused by the foreign matter entering the runner or the fuel swelling. When the reactor power is increased, the temperature of the fuel assembly in the blocked runner rises, the coolant begins to boil and the power fluctuates obviously, Fluence rate, power monitoring and fuel temperature analysis are important for preventing plugging accidents. Combined with the reality of China Advanced Research Reactor (CARR), RELAP program was used to well simulate partial blockage and total blockage