铅铋冷却次临界堆反应性引入下的中子学动态特性分析  

Analysis of Neutronics and Dynamic Characteristics with Reactivity Injection in LBE Cooled Sub-critical Reactor

作　　者：陈森[1,2] 金鸣[2] 陈志斌[2] 柏云清[2] 赵柱民[2] 吴宜灿[2,1] 

机构地区：[1]中国科学技术大学,合肥230026 [2]中国科学院核能安全技术研究所,合肥230031

出　　处：《核安全》2014年第2期45-49,共5页Nuclear Safety

基　　金：国家自然科学基金重大研究计划项目;课题编号NO.91026004

摘　　要：加速器驱动次临界系统(ADS)与临界系统相比具有不同的中子学动态特性。采用瞬跳近似导出了次临界状态下反应性扰动引起中子密度和堆功率变化的关系式,与基于RELAP5开发的次临界点堆动力学程序做了不同次临界度(keff=0.90,0.95,0.97,0.98和0.99)下1 s内引入反应性+1β的中子学动态特性对比分析。结果表明:①有外源的瞬跳近似能够精确地描述受扰动后很短的一段时间之后的中子密度和堆功率的变化情况,能用于求解有外源的点堆动态方程渐进情况下的解;②反应性引入事故过程中,次临界堆表现出内在稳定性,次临界度越深,偏离临界越远,反应性扰动对次临界堆的影响就越小。Accelerator Driven Sub-critical System（ADS） has particular neutronics behaviors compared with the critical system. Prompt jump approximation point reactor kinetics equations taken external source into account have been deduced using an approach of prompt jump approximation. And the relationship between injection reactivity and power ampliation has been achieved. In addition,based on the RELAP5 code the prolong development of point reactor kinetics code used into assessing sub-critical system have been promoted. Different sub-criticalities（keff =0.90,0.95,0.97,0.98 and 0.99）have been assessed in preliminary design of a type of natural circulation cooling sub-critical reactor under conditions of reactivity injection ＋1βin one second. It shows that the external source prompt transient approximation method has an accurate solution after injecting reactivity around short time and has a capacity to solve the dynamic equation,and the sub-critical system has an inner stability while the deeper sub-criticality the less impact on the sub-critical system.

关 键 词：ADS 反应性引入 RELAP5 瞬态分析 

分 类 号：TL327[核科学技术—核技术及应用]