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球床高温气冷堆在初装堆芯建立过程中,会出现堆芯燃料球比例、空隙填充物质和顶空腔高度等不断变化的情况。基于确定论方法的设计程序VSOP在进行初装堆芯物理计算时需要采用多种特殊处理。为了明确这些特殊处理引入的近似程度,该文选用通用Monte Carlo程序更精细地模拟了初装堆芯。对比结果表明:对于初装堆芯,VSOP程序采用等效球体模型进行热谱计算、通过流修正方法对堆芯空隙填充物质反应性价值进行计算、以真空气氛近似氦气气氛、采用分方向扩散系数的方法对大尺寸顶空腔进行计算所引入的误差都很小。因此,VSOP程序对初装堆芯的这些近似处理是合理可行的。
Ball bed high temperature gas-cooled reactor in the initial installation of the reactor core, there will be core fuel ball ratio, void fill material and the height of the top cavity constantly changing situation. The VSOP, a design program based on deterministic methods, requires a variety of special processes when performing initial core physics calculations. In order to clarify the degree of approximation introduced by these special processes, this article uses a generic Monte Carlo program to simulate the initial core more precisely. The comparison results show that the VSOP program uses the equivalent sphere model to calculate the thermal spectrum for the initial core assembly, and calculates the reactivity value of the core void filling material by the flow correction method. The vacuum atmosphere approximates the helium atmosphere, The method of factoring introduces small errors in the calculation of large-size headspaces. Therefore, these approximations of the initial core of the VSOP program are reasonable and feasible.