燃料棒肿胀破裂对LOCA事故进程影响研究  

Effect of Rod Swelling and Rupture on LOCA Process

作　　者：吴丹[1,2] 邓坚[1,2] 丁书华[1,2] 辛素芳 鲜麟 毕树茂[1] 毛辉辉[1] Wu Dan;Deng Jian;Ding Shuhua;Xin Sufang;Xian Lin;Bi Shumao;Mao Huihui(Nuclear Power Institute of China,Chengdu,610213,China;Science and Technology on Reactor System Design Technology Laboratory,Nuclear Power Institute of China,Chengdu,610213,China)

机构地区：[1]中国核动力研究设计院,成都610213 [2]中国核动力研究设计院核反应堆系统设计技术重点实验室,成都610213

出　　处：《核动力工程》2020年第3期188-192,共5页Nuclear Power Engineering

基　　金：国家自然科学基金项目(U1867219)。

摘　　要：反应堆冷却剂丧失事故(LOCA)中燃料棒会经历几次比较明显的温升过程,当温升达到一定程度时,会发生燃料棒肿胀破裂现象。燃料棒的肿胀破裂会使得燃料棒内外层均被氧化,氧化膜厚度增加会加剧锆-水反应,从而影响LOCA事故进程。本研究使用满足美国联邦法规10 CFR 50.46附录K要求的系统分析程序ARSAC-K,以自主化三代核电厂作为分析对象,选取4种功率分布形式研究燃料棒肿胀破裂行为对LOCA事故进程的影响,结果表明:破裂时刻包壳附近会出现一段时间明显的降温过程,该过程持续大约20~30 s,随后燃料棒温度继续上升直至达到包壳峰值温度(PCT)。Fuel rods experience the heat up process several times during the loss of coolant accident(LOCA). Swelling and rupture will happen if the temperature rises to a certain degree which will have great effect on the LOCA process. Both the inside and outside of the fuel cladding will be oxidized, and this will exacerbate the Zr-H2O reaction. In this study, code ARSAC-K is used to analyze the LOCA process in the generation-III nuclear power plants designed and constructed by China. In order to study the effect of rod swelling and rupture on the LOCA process, several power shapes are chosen. It is found that at the moment of rod rupture, the temperature of the rod cladding will decrease in a few tens of seconds. After few tens of seconds, the cladding temperature continues to rise till the peak cladding temperature is reached.

关 键 词：冷却剂丧失事故(LOCA) 燃料棒 肿胀破裂 ARSAC-K 功率分布 包壳峰值温度(PCT) 

分 类 号：TL352[核科学技术—核技术及应用]