ABSTRACT

The latest ENDF/B-VIII library adapted new porosity-dependent cross-section data of graphite. However, the porosity of the actual graphite does not necessarily correspond to the porosity given in the data. We have proposed a method to perform neutronic calculations at the desired porosity on the basis of the pseudo-material method. We have also compared the k_eff values calculated by the pseudo-material method with the experimental values for the VHTRC. In addition, we have investigated the temperature dependance of the calculation values obtained by this method. From these results, we have concluded that this method allows us to perform the neutronic calculations in which we can reflect detailed information on the porosity of graphite.

摘要

最新的 ENDF/B-VIII 库采用了新的与孔隙率相关的石墨横截面数据。然而，实际石墨的孔隙率不一定与数据中给出的孔隙率相对应。我们提出了一种基于伪材料方法在所需孔隙率下进行中子计算的方法。我们还将通过伪材料方法计算的k _eff值与 VHTRC 的实验值进行了比较。此外，我们研究了通过这种方法获得的计算值的温度依赖性。从这些结果中，我们得出结论，该方法允许我们进行中子计算，在其中我们可以反映石墨孔隙率的详细信息。