5MW THR物理计算方法的研究

5MW THR 燃料组件中的水隙、大当量十字形控制捧、可燃毒物棒、水栅元和元件盒引起强烈的不均匀效应;加之堆芯体积小,造成严重的中子泄漏,给物理设计带来困难,为此,提出了一种有效的方法。介绍了基本原理,简述了物理模型的建立和对具体问题的处理,并对一系列零功率实验和文献给出的功率分布测量实验作了理论计算,结果是满意的。本征值 k_(eff)最大误差为0.83%,局部峰值因子的最大误差为6%;计算了5MW THR 1∶1零功率实验的10个临界值和13根控制棒当量。本征值K_(eff)最大误差为0.9%;对5MW THR 启动阶段测量的本征值 k_(eff)、控制棒当量、等温温度系数和过剩反应性做了校核,结果是令人满意的。

Research on Physical Calculation Methods for 5MW THR

Both the configuration of the assembly in 5MW THR with its cruci-form control rod,water gap,poison rod,assembly box and water cell and thesmall dimension of the core bring about high heterogeneity and strongleakage which make the physical design quite difficult.An effective methodis developed to solve this problem.After the basic concepts are introducedbriefly,the foundation of the physical models and their special treatmentsare given in detail.The method is validated against eigenvalues of a ser-ies of critical experiments we specially designed and the measured powerdistribution reported in the literature.Over all agreement is observed to be satisfactory.The maximum error of Local Peaking Factor is 6% andeigenvalue 0.83%,10 eigenvalues and 13 control rods worth of the 5MWTHR have been calculated and compared with 1:1 zero power experimentresults.The maximum error of the eigenvalue is 0.9%.On the start-upphase a series paraments of the 5MW THR was mesured.These includeeigenvalue k_(eff),control rod worth,equal temperature eoefficent of thereactivity and excess reactivity.And compared them with the calculationare satisfactory.