Abstract

Uncertainty quantification of lead (Pb) and bismuth (Bi) sample reactivity worth is numerically determined using the SCALE6.2 code system and experimental results obtained from the solid-moderated and solid-reflected core at the Kyoto University Critical Assembly (KUCA) to demonstrate the sensitivity coefficients of aluminum (Al) and Bi scattering reactions. From the results of the numerical analyses, the impact of ²⁷Al and ²⁰⁹Bi scattering cross sections obtained using SCALE6.2/TSAR is disclosed on the Bi sample reactivity worth using Al reference and Bi test samples, although the uncertainty itself is small in the Bi sample reactivity worth. In future studies, the actual impact of ²⁰⁹Bi inelastic scattering reactions in liquid Pb-Bi eutectic needs to be considered under numerical simulations of the void reactivity in the accelerator-driven system. Also, in the KUCA experiments, conventional modeling of void evolution by the Al reference sample is expected to be altered by a void (air) in terms of the ²⁷Al elastic and inelastic scattering reactions of the Al reference sample.

摘要

铅 (Pb) 和铋 (Bi) 样品反应性价值的不确定性量化使用 SCALE6.2 代码系统和从京都大学关键组件 (KUCA) 的固体慢化和固体反射核心获得的实验结果进行数值确定，以证明铝 (Al) 和 Bi 散射反应的灵敏度系数。从数值分析的结果来看，使用 SCALE6.2/TSAR 获得的²⁷ Al 和²⁰⁹ Bi 散射截面对使用 Al 参考和 Bi 测试样品的 Bi 样品反应性的影响被公开，尽管不确定性本身在Bi 样品反应价值。在未来的研究中，²⁰⁹的实际影响在对加速器驱动系统中的空隙反应性进行数值模拟时，需要考虑液体 Pb-Bi 共晶中的 Bi 非弹性散射反应。此外，在 KUCA 实验中，根据铝参考样品的^{27 个}铝弹性和非弹性散射反应，预计铝参考样品对空隙演化的常规建模会被空隙（空气）改变。