固态燃料钍基熔盐实验堆燃耗补偿棒位计算  

Location calculation of shim rods in thorium molten salt reactor with solid fuel

作　　者：朱贵凤[1] 严睿[1] 于世和[1] 彭红花[1] 康旭忠[1] 杨璞[1] 周波[1] 邹杨[1] ZHU Guifeng;YAN Rui;YU Shihe;PENG Honghua;KANG Xuzhong;YANG Pu;ZHOU Bo;ZOU Yang(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》2018年第11期61-66,共6页Nuclear Techniques

基　　金：中国科学院战略性先导科技专项(No.XDA02010000);中国科学院前沿科学重点研究项目(No.QYZDY-SSW-JSC016)资助~~

摘　　要：燃耗补偿棒棒位是反应堆监测的一项重要参数,同时棒位移动会对堆芯物理参数分布造成影响。计算了固态燃料钍基熔盐实验堆(Thorium Molten Salt Reactor with Solid Fuel, TMSR-SF1)的补偿棒位变化,并分析其对功率、通量及燃耗分布的影响。在一般蒙特卡罗燃耗软件基础上耦合了调棒临界搜索功能,计算表明大部分临界搜索只需三次,验证了算法收敛的有效性。对TMSR-SF1未分组补偿棒方案进行了计算,结果表明:补偿棒位在氙平衡及寿期末时刻有较大提升幅度,其余时刻近似线性上升;补偿棒初期在总行程一半偏上位置,增加了堆芯轴向功率及中子通量分布的不均匀性,相对寿期末功率峰因子偏大17%,最大中子通量偏大12%。该变化未对总体设计参数造成显著影响,证明补偿棒未分组方案具有设计可行性。[Background] The location of shim rods is one important monitoring parameter of nuclear reactor, and the shift of shim rods will affect the core physical parameters. [Purpose] This study aims to calculate the location of shim rods varied with burnup time in thorium molten salt reactor with solid fuel （TMSR-SF1）, and analyze its effect on the spatial distribution of power density, flux and bumup. [Methods] A reactivity search by adjusting shim rods is coupled to conventional Monte Carlo burnup code. It is validly shown that 3 times are mostly required to realize reactivity convergence. The location of shim rods with one group scheme in TMSR-SF1 is calculated. [Results] Results show that shim rods are sharply moved when near to the time of xenon equilibrium and end of life, while linear changed under middle burnup time. Shim rods at the beginning are located in the upper side of half rod route, which increases the axial unevenness of power density and flux. The power peak factor and maximum flux are 17% and 12% larger than those at the end of life. [Conclusions] This change of power peak factor and maximum flux are accepted and it is feasible to use one group scheme of shim rods in TMSR-SF1.

关 键 词：燃耗 补偿棒 固态燃料钍基熔盐实验堆 

分 类 号：TL3[核科学技术—核技术及应用]