耐事故核燃料包壳涂层强度研究进展

Progress in Strength Assessment of Surface Coatings for Accident Tolerant Fuel Claddings

耐事故燃料包壳涂层技术是新一代核燃料系统提升事故能力的主流方案之一,具备近年内投入应用的可行性。强度是耐事故涂层包壳性能考核的重要指标,深入研究耐事故涂层包壳力学性能及失效机理对耐事故涂层的设计、制备及安全准则的建立具有重要意义。重点介绍了近年来国内外研究团队及本课题组在耐事故涂层包壳强度研究方面的前沿工作,如耐事故涂层包壳力学性能与失效机理、涂层包壳力学性能原位测试技术与模型、高温服役工况及严重事故工况下耐事故涂层包壳的强度等。

Among the accident tolerant fuel(ATF)concepts,surface coating technology has been regarded as one of the mainstream solutions for improving the accident resistance of the new generation of nuclear fuel systems,and has the prospect of being put into application in recent years.High temperature strength is an important indicator for the performance assessment of ATF coatings.Thus,in-depth studies of the mechanical properties and failure mechanism of ATF coated claddings are of great significance for the design,preparation and establishment of safety criteria for ATF coatings.This review focuses on the cutting-edge work in the worldwide research on the strength of ATF coatings in recent years,involving the mechanical properties and failure mechanism of ATF coatings,the in-situ mechanical testing technology and models,and the strength of ATF coatings under high-temperature service conditions and serious accident conditions.