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| 摘要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MonteCarlo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。 |
| 关键词 ：球床高温气冷堆,初装堆芯,VSOP程序,Monte Carlo程序,验证 |
| Abstract：During the building of the first core of the pebble bed high-temperature gas-cooled reactor (PBR), the ratio between the fuel spheres and graphite spheres, the fill material in the gaps in the core and the cavity height above the pebble bed will change. Thus, the neutronics design of the first core using the deterministic VSOP code needs some special treatments. The approximations for the first are an evaluated using a more detailed model of the first core analyzed by a general Monte Carlo code. Comparisons of the predictions of the two codes show that the special treatments for the first core used with the VSOP code will not cause significant errors include using the equivalent sphere model to calculate the thermal spectrum, calculating the reactivity of the gap fill material using the streaming correction method, heating the helium atmosphere as a vacuum, and using anisotropic diffusion coefficients to model the large top cavity. Thus, these special treatments for the first core used by the VSOP code are acceptable. |
| Key words：pebble bed high-temperature gas-cooled reactorfirst coreVSOP codeMonte Carlo codeverification |
| 收稿日期: 2012-07-11 出版日期: 2017-04-19 |
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| 通讯作者:李富,研究员,E-mail：lifu@mail.tsinghua.edu.cnE-mail: lifu@mail.tsinghua.edu.cn |
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