有限元方法在破前漏临界裂纹计算中的应用  

Application of FEM in Critical Crack Length Calculation in Leak Before Break

作　　者：甄洪栋 罗晶 张雷 房永刚[2] ZHEN Hong-dong;LUO Jing;ZHANG Lei;FANG Yong-gang(Nuclear Power Engineering Co.Ltd.,Shenzhen of Guangdong Prov.518057,China;Nuclear and Radiation Safety Center,Ministry of Environmental Protection,Beijing 100082,China)

机构地区：[1]深圳中广核工程设计有限公司,广东深圳518057 [2]环境保护部核与辐射安全中心,北京100082

出　　处：《核科学与工程》2018年第4期557-562,共6页Nuclear Science and Engineering

摘　　要：破前漏(LBB,Leak-Before-Break)技术多应用于轻水堆核电站高能管道的设计中,该技术是一种通过确定论的断裂力学评价和泄漏率计算,配合泄漏监测等手段论证高能管道不会出现双端剪切断裂事故的方法。通过断裂力学计算临界裂纹,是破前漏分析中关键的一环。传统的计算方法,采用经验公式如GE/EPRI公式,受限于管道材料、结构形状,具有一定的应用范围限制,不能严格满足一般工程问题的要求。本文给出的有限元方法,不仅克服经验公式的使用局限性,而且提升了计算精度,具有良好的工程推广价值。Leak-Before-Break(LBB)technology was usually used in the design of high energy piping in light water reactor plant,It is a way consisting of fracture mechanics and leak rate calculation,aided with leak detection system to prove that double end guillotine break of high energy piping will not occur.Application of this technology can improve the economic and safety of nuclear plant.Critical crack length calculation is the key point of LBB.This article gives a method to calculate the critical crack length with FEM.It not only solves the restriction of formulations and enlarges the scope of application,but also improves the precision of result,which can be wildly used in Design.

关 键 词：有限元方法 破前漏分析 临界裂纹计算 

分 类 号：TL48[核科学技术—核技术及应用]