发生落棒事故时的PCI研究  

PCI Analysis during Rod Drop Transient

作　　者：刘彤[1] 张林[1] 沈才芬[1] 肖忠[1] 吕华权[1] 

机构地区：[1]中国核动力研究设计院核反应堆系统设计技术国家重点实验室,成都610041

出　　处：《核动力工程》2006年第5期65-69,共5页Nuclear Power Engineering

摘　　要：当反应堆发生落棒事故时,燃料芯块与包壳的相互作用瞬间增强,易造成燃料棒破损,从而影响核电站的正常运行。本文介绍了反应堆II类瞬态下燃料棒芯块与包壳相互作用的机理和定量分析方法,并针对大亚湾核电站18个月换料的燃料管理方案进行了发生落棒事故时的PCI热力学评价。初步的研究结果表明:如果在自然循环长度和延伸燃耗运行期内发生落棒事故,对于基负荷运行和基负荷一次调频运行,均有PCI的应力裕量,不会造成燃料棒破损。During rod drop transient, the interaction between pellet and cladding increases instantly, which may leads to failure of fuel rod. This paper introduces the mechanism and quantative method to analyze PCI during transient II, with which the PCI thermal-mechanical analysis has been carried out for the 18-month fuel cycle management of GNPS. The results show there are enough stress margins for the base load operation and primary frequency control operation if rod drop accident occurs in the natural cycle and stretch out operation, therefore no risk of PCI failure has been found.

关 键 词：燃料芯块 包壳 相互作用 落棒事故 

分 类 号：TL352.21[核科学技术—核技术及应用]