| 熔盐堆主回路系统氙的动力学特性研究 |
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| 引用本文： | 周 波,严 睿,邹 杨.熔盐堆主回路系统氙的动力学特性研究[J].核动力工程,2018,39(5):15-20. |
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| 作者姓名： | 周 波 严 睿 邹 杨 |
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| 摘 要： | 基于Mathematica7.0为熔盐堆（MSR）主回路系统建立了一套含流动项及在线去除功能的氙（135Xe）的动态分布数值分析程序，针对2?MW MSR的一种设计方案，分析了不同流量、不同启停堆功率、不同在线去除效率情况下135Xe浓度随时间的动态变化特性。结果表明:相较于静态燃耗模型，流动燃耗模型的135Xe带来的负反应性要低约32.2%；额定流量下主回路系统135Xe浓度分布均匀，只有当主回路系统体积流量小于2.24 cm3·s-1时，流动效应才会对主回路系统内135Xe浓度分布有显著影响；当鼓泡系统的在线去除份额约为0.1%时可以使堆芯135Xe带来的负反应性降低至-38.3 pcm?（1 pcm =10-5），其总的去除效率可以达到86.0%；不同功率水平瞬时停堆工况下，堆芯135Xe浓度单调下降，停堆约50 h后135Xe基本消失，相当于引入+254 pcm反应性，停堆过程无碘坑出现，停堆后再启堆过程不必担心碘坑启动的问题。135Xe去除效率对整个系统135Xe总量有一定影响，在去除份额从0.0001%~20%的变化范围内，135Xe的总活度与静态燃耗模型相比相应增加了0.67%~8.75%。
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| 关 键 词： | 熔盐堆 平衡135Xe 流动模型 数值模拟 |
Analysis of Xenon Dynamic Characteristics in Primary Loop System of MSR |
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| Abstract: | A numerical simulation program for the dynamic distribution of xenon with flow and on-line removal function was established for the primary loop system of molten salt reactor (MSR) based on Mathematica7.0. The dynamic characteristics of xenon concentration with time under different flow rates, different startup and shutdown power, and different on-line removal efficiencies were analyzed based on a kind of design scheme of 2MW MSR. The results show that the xenon negative reactivity of the flow burnup model is about 32.2% lower than that of the static burnup model. The xenon concentration distribution in the primary loop system is uniformity under the rated flow rate, and the flow effect can affect the distribution of xenon concentration in?the?primary loop system only when the volume flow of the primary loop system is less than 2.24 cm3·s-1.When the online removal fraction of the bubbling system in?the?pump bowl is about 0.1%, the xenon poison reactivity in the core can be reduced to -38.3 pcm, and the total removal efficiency can reach 86.0%. Xenon concentration in the reactor decreased monotonously under different instantaneous shutdown power and about +254 pcm reactivity was insertion accordingly. Xenon poison is disappeared after 50 hours of shutdown. The removal efficiency of xenon has an influence on the total xenon in the primary loop system. In the range of the removal fraction from 0.0001%~20%, the total xenon increases by 0.67%~8.75% compared with the static burn model. The numerical simulation method and the conclusion are consistent with the actual physical laws. |
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