紧急停堆棒落棒时间对熔盐堆反应性引入瞬态的影响  

The effect of scram rod drop time on the consequences of molten salt reactor reactivity insertion transient

作　　者：王凯[1] 焦小伟[1] 杨群[1] 吴燕华[1] 王超群 何兆忠[1] WANG Kai;JIAO Xiaowei;YANG Qun;WU Yanhua;WANG Chaoqun;HE Zhaozhong(Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China)

机构地区：[1]中国科学院上海应用物理研究所,上海201800

出　　处：《核技术》2020年第9期88-94,共7页Nuclear Techniques

基　　金：中国科学院青年创新促进会项目(No.Y929022031)资助

摘　　要：紧急停堆棒落棒时间是影响反应堆安全特性的重要参数,以2 MW钍基熔盐堆为研究对象,采用RELAP5-TMSR(Reactor Excursion and Leak Analysis Program-Thorium Molten Salt Reactor)程序,建立熔盐堆系统的瞬态行为分析模型,对控制棒提棒速度的敏感性进行分析,并重点分析探索紧急停堆棒落棒时间对熔盐堆反应性引入瞬态后果的影响规律。结果表明:即使紧急停堆棒落棒时间达到10 min,哈氏合金的最高温度也仅为708.2℃,燃料盐最高温度为709.2℃,均低于安全允许限值,表明该熔盐堆具有良好的应对反应性引入事件的能力。[Background]The scram rod drop time is an important parameter for reactor safety analysis,which is of great significance to the safety of molten salt reactor(MSR).The process and the consequences of the design basis events of the MSR will be significantly influenced by the dropping time of scram rod.[Purpose]This study aims to analyse the effect of the scram rod drop time on the consequences of MSR reactivity insertion transient.[Methods]First of all,the RELAP-MS based RELAP5-TMSR(reactor excursion and leak analysis program-thorium molten salt reactor)code was employed to establish the safety analysis model for the transient simulation of TMSR-LF.Then,the sensitivity of control rod withdrawal speed to transient consequences was analyzed,next,reactivity introduction event caused by the withdrawal of a control rod at full power was taken into account to analyse the vartions of power,temperatures of fuel salt and structure materials.Influence of scram rod dropping time in emergency shutdown on transient consequences of reactivity introduction in MSR was analyzed.[Results]Even if the scram rod drop time reaches as long as 10 min,the maximum temperature of Harrington alloy is 708.2℃,and the maximum temperature of fuel salt is 709.2℃,which is below the safety limit.[Conclusions]The molten salt reactor has good safety characteristics,low requirements for scram rod drop time,and the ability to deal with reactivity insertion event.

关 键 词：熔盐堆 落棒时间 RELAP-TMSR 安全分析 

分 类 号：TL36[核科学技术—核技术及应用]