ABSTRACT

CBZ is a general-purpose reactor physics analysis code system, and FRBurner, which focuses on fast reactor burnup calculations, was developed recently with diverse combinations of available methodologies. Verification of this module is conducted with the OECD/NEA fast rector benchmark since this benchmark provides various types of fast reactors. Four key reactor physics parameters, effective neutron multiplication factor k_eff, effective delayed neutron fraction β_eff, sodium void reactivity ∆ρ_void, and Doppler reactivity ∆ρ_Doppler are the focus and compared to two references provided by JAEA and CEA, respectively. The biases between the results from FRBurner and the JAEA and CEA references on each of the above key parameters are less than 0.5%, 1%, 3% and 7%, and less than 1.0%, 4%, 12%, and 12%, respectively. The comparison indicates that the FRBurner module would provide acceptable results for general-type fast reactor physics analysis in research. As one innovation, the detailed burnup chain model, which is significantly different from a generally used pseudo fission product model in fast reactor neutronic analysis, is applied in FRBurner. The detailed burnup chain model helps FRBurner explicitly provide information about the inventory of fission products for nuclear waste management and spent fuel reprocessing.

摘要

CBZ 是一个通用的反应堆物理分析代码系统，FRBurner 专注于快堆燃耗计算，最近开发了多种可用方法的组合。该模块的验证是使用 OECD/NEA 快堆基准进行的，因为该基准提供了各种类型的快堆。四个关键的反应堆物理参数，有效中子倍增因子k _eff，有效延迟中子分数β _eff，钠无效反应性 Δ ρ _void和多普勒反应性 Δ ρ _Doppler是重点，并分别与 JAEA 和 CEA 提供的两个参考进行比较。FRBurner 与 JAEA 和 CEA 参考文献在上述每个关键参数上的结果之间的偏差小于 0.5%、1%、3% 和 7%，小于 1.0%、4%、12% 和 12% ， 分别。比较表明，FRBurner 模块将为研究中的通用型快堆物理分析提供可接受的结果。作为一项创新，FRBurner采用了与快堆中子分析中普遍使用的伪裂变产物模型显着不同的详细燃耗链模型。详细的燃耗链模型有助于 FRBurner 明确提供有关用于核废物管理和乏燃料后处理的裂变产物库存的信息。