RIA下PCMI行为的堆外验证试验研究  

Experimental Study on PCMI Behavior of RIA outside Reactor

作　　者：郝思佳 丁锡嘉 胡真 许倩[1] 韩智杰[1] HAO Sijia;DING Xijia;HU Zhen;XU Qian;HAN Zhijie(Reactor Engineering Technology Research Institute,China Institute of Atomic Energy,Beijing 102413,China)

机构地区：[1]中国原子能科学研究院反应堆工程技术研究所,北京102413

出　　处：《原子能科学技术》2024年第2期365-371,共7页Atomic Energy Science and Technology

基　　金：中核集团“青年英才”项目。

摘　　要：目前国内的反应性引入事故(RIA)研究中尚未开展芯块包壳机械相互作用(PCMI)失效模式的相关试验研究。为探究有效的试验方法并获取相关试验数据以分析包壳失效的作用机理,本文基于自主设计的堆外模拟PCMI试验的压缩膨胀(EDC)试验装置,采用高速摄像技术辅助,获取了双轴加载燃料元件包壳失效过程中的载荷、应变、破口情况等数据。研究结果表明,试验得出的包壳管残余应变比位于-0.1~0.5之间,符合堆内残余应变比范围。研究结果可为将来开展堆内试验储备技术和积累经验,为安全准则的建立及补充提供可参考的基础数据。The performance of zirconium alloy cladding has always been a concern during reactor accidents.Ensuring the safe operation of high fuel consumption under reactivity initiated accident condition is also the core issue that scholars from various countries pay common attention to.The United States,France,Japan,Russia and other countries have carried out a large number of tests under reactivity initiated accident conditions.Some countries have also carried out the most advanced biaxial loading tests outside reactors,which has laid a solid foundation for these countries to occupy a leading position in the field of nuclear fuel safety.At present,there was no experimental study on pellet cladding mechanical interaction(PCMI)failure mode in Reactivity initiated accident(RIA)research in China.In order to establish our own safety criteria for reactivity initiated accident operating conditions,it is urgent to carry out domestic independent reactivity insertion accident test research,so as to provide data support for the commercial application of advanced fuel components.PCMI failure of cladding under reactivity insertion accident condition is a typical failure mode of high burnup fuel.Exploring effective test methods and obtaining test data to analyze the mechanism of pellet-cladding mechanical interaction is necessary.In this paper,out-pile simulated cladding failure was studied.Out-pile test device simulated PCMI was designed and domestic Zr-4 cladding was chosen as test material.High speed camera technology was used to assist.Hydrogen content absorbed in test material was used to simulate different high burnup cladding mechanical properties.The data of load,strain and fracture during the failure process of biaxial loading fuel element cladding were obtained.The macroscopic morphology and residual strain of test materials were analyzed after tests and stress state and maximum circumferential strain data of cladding tube under out-pile simulated reactivity insertion accident condition were obtained.The comparison with fore

关 键 词：反应性引入事故 芯块包壳机械相互作用 压缩膨胀试验 高速摄像技术 

分 类 号：TL364[核科学技术—核技术及应用]