中国双功能铅锂实验包层系统In-box LOCA事故瞬态压力传播特征分析  

Transient Pressure Analysis for China Dual-function Lithium Lead Test Blanket System under In-box LOCA Accident

作　　者：陈林[1,2] 张世超[1,2] 孟孜[1] FDS凤麟核能团队 CHEN Lin;ZHANG Shichao;MENG Zi;FDS team(Key Laboratory of Neutronics and Radiation Safety,Institute of Nuclear Energy Safety Technology,Chinese Academy of Sciences,Hefei,Anhui,230031,China;University of Science and Technology of China,Hefei,Anhui,230027,China)

机构地区：[1]中国科学院核能安全技术研究所中子输运理论与辐射安全重点实验室,安徽合肥230031 [2]中国科学技术大学,安徽合肥230027 [3]不详

出　　处：《核科学与工程》2019年第2期246-252,共7页Nuclear Science and Engineering

基　　金：国家科技基础条件平台建设项目"国家基础科学数据共享服务平台"(DKA2017-12-02-17);国家自然科学基金(51606206);安徽省自然科学基金(1608085QA09)

摘　　要：中国双功能铅锂实验包层系统(CN DFLL TBS)发生氦气—铅锂流道间破口(In-box LOCA)事故时,8 MPa高压氦气喷向低压铅锂增殖区,高压以压力波形式从包层模块(TBM)的铅锂增殖区传播到铅锂辅助系统(LLAS),造成系统超压,威胁包层安全。本文采用RELAP5/MOD4.0软件对DFLL包层系统进行建模,开展了破口事故下的系统瞬态压力传播分析,对破口位置、面积、爆破阀起爆压力等重要参数进行敏感性分析。分析表明:不同位置破口事故下,包层压力入口最高可达16.68 MPa,包层出口处最高可达13.92 MPa;单根与10根传热管破裂事故,包层出入口压力分别增加0.97 MPa、1.68 MPa;为降低包层内部的压力峰值,可在包层模块进出口管道设置体积不小于1.2×10^(-2) m^3稳压装置。通过将铅锂辅助系统的关键部件布置在稳压装置附近,可有效保护其不超出其压力限值。When In-box LOCA accident happened in Dual-Function Lithium Lead Test Blanket System(DFLL TBS),high pressure helium gas injected into low-pressure Lithium Lead (PbLi)zone,which caused pressurization and threaten the integrity of structure. In this paper, the model of DFLL TBS was created by RELAP5. In-box LOCA was analyzed,and the key parameters included the position and size of rupture,the blasting pressure were performed sensitivity analysis. The results show that the pressure(8.0 MPa)of helium was exceeded in different locations of rupture,the peak pressure of inlet is 16.68 MPa,and outlet is 13.92 MPa. Peak pressure was increased by 0.97 MPa(outlet)and 1.68 MPa(inlet)respectively under 1 and 10 channel rupture. In order to reduce the peak pressure inside the blanket module,two expansion vessels(>1.2×10^-2 m^3)were installed near the inlet and outlet pipes of the blanket respectively. By installing key components near the expansion vessel in LLAS , key components could be protected from exceeding their pressure limits.

关 键 词：双功能液态铅锂包层 RELAP5 In-box LOCA 压力传播 

分 类 号：TL69[核科学技术—核技术及应用]