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Uncertainties propagation in the UAM numerical rod ejection benchmark
Annals of Nuclear Energy ( IF 1.9 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.anucene.2020.107339
A. Sargeni , F. Fouet , E. Ivanov , P. Probst

Abstract This paper presents the execution and the results of a rod ejection benchmark inspired by the UAM benchmarks II-2b: cross sections uncertainties propagation during a rod ejection transient in a mini-core (3 × 3 PWR-type assemblies), without feedback. Performing transient computations in two groups time-dependent neutron diffusion approximation while starting from a steady-state power of 0.1409 MW, we obtained a mean power peak around 0.25 MW with a standard deviation of, nearly, 1.5%. The time-dependent standard deviation curve follows the time-dependent mean power curve and the relative standard deviation, in a percentage of the mean power, increases with the mean power peak value. We found, too, that the first-group diffusion coefficient and the first-group absorption cross section are, practically, the only contributors to the total power peak variance. Drawbacks and findings from the exercise provide essential input for uncertainty propagation in a further multi-physics simulation of a postulated rod ejection accident.

中文翻译:

UAM数值棒弹射基准中的不确定性传播

摘要 本文介绍了受 UAM 基准 II-2b 启发的棒弹射基准测试的执行和结果:在没有反馈的情况下,微型堆芯(3 × 3 PWR 型组件)中棒弹射瞬变期间的截面不确定性传播。从 0.1409 MW 的稳态功率开始,在两组时间相关中子扩散近似中执行瞬态计算,我们获得了大约 0.25 MW 的平均功率峰值,标准偏差接近 1.5%。时间相关标准偏差曲线遵循时间相关平均功率曲线,并且相对标准偏差(以平均功率的百分比表示)随着平均功率峰值而增加。我们也发现,第一组扩散系数和第一组吸收截面实际上是,总功率峰值方差的唯一贡献者。演习中的缺点和发现为假设棒弹射事故的进一步多物理场模拟中的不确定性传播提供了必要的输入。
更新日期:2020-06-01
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