Abstract An on-the-fly homogenization (OTFHom) method coupled with depletion based on Monte Carlo method was proposed and implemented in Reactor Monte Carlo code (RMC), which uses continuous energy cross sections to generate multi-group cross sections for specified problems and then uses them in Monte Carlo multi-group calculations to get more convergent results. In order to coupling with depletion, some modifications are made in continuous energy and multi-group calculation procedures to get one-group depletion cross sections and flux for each depletion region. A verification of OTFHom method is carried out to investigate the accuracy and efficiency using HTTR benchmark, which is a prismatic block-type high temperature gas cooled reactor designed by Japan. The criticality and depletion results show that OTFHom method can capture double heterogeneity effect accurately and reduce calculation time considerably because of the spatial homogenization of massive TRISO particles embedded in the graphite matrix. In terms of HTTR model, the time used by CE calculation is about 3 times of that used by OTFHom calculations.

中文翻译：

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基于HTTR分析的on-the-fly均质方法验证

摘要 提出了一种基于蒙特卡罗方法的动态均质化（OTFHom）方法，并在反应堆蒙特卡罗代码（RMC）中实现了该方法，该代码使用连续能量横截面为指定问题生成多组横截面和然后在蒙特卡罗多组计算中使用它们以获得更收敛的结果。为了与耗尽区耦合，对连续能量和多组计算程序进行了一些修改，以获得每个耗尽区的一组耗尽截面和通量。使用由日本设计的棱柱块式高温气冷堆 HTTR 基准对 OTFHom 方法进行验证，以研究其准确性和效率。临界性和损耗结果表明，由于嵌入石墨基体中的大量 TRISO 颗粒的空间均质化，OTFHom 方法可以准确捕获双异质性效应并大大减少计算时间。在HTTR模型方面，CE计算使用的时间大约是OTFHom计算使用的时间的3倍。