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首页> 外文期刊>Annals of nuclear energy >Coupling of system thermal-hydraulics and Monte-Carlo code: Convergence criteria and quantification of correlation between statistical uncertainty and coupled error
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Coupling of system thermal-hydraulics and Monte-Carlo code: Convergence criteria and quantification of correlation between statistical uncertainty and coupled error

机译：系统热工液压与蒙特卡洛代码的耦合：收敛标准和统计不确定性与耦合误差之间的相关性量化

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摘要

Coupled multi-physics approach plays an important role in improving computational accuracy. Compared with deterministic neutronics codes, Monte Carlo codes have the advantage of a higher resolution level. In the present paper, a three-dimensional continuous-energy Monte Carlo reactor physics burnup calculation code, Serpent, is coupled with a thermal-hydraulics safety analysis code, RELAP5. The coupled Serpent/RELAP5 code capability is demonstrated by the improved axial power distribution of UO_2 and MOX single assembly models, based on the OECD-NEA/NRC PWR MOX/U)_2 Core Transient Benchmark. Comparisons of calculation results using the coupled code with those from the deterministic methods, specifically heterogeneous multi-group transport code DeCART, show that the coupling produces more precise results. A new convergence criterion for the coupled simulation is developed based on the statistical uncertainty in power distribution in the Monte Carlo code, rather than ad-hoc criteria used in previous research. The new convergence criterion is shown to be more rigorous, equally convenient to use but requiring a few more coupling steps to converge. Finally, the influence of Monte Carlo statistical uncertainty on the coupled error of power and thermal-hydraulics parameters is quantified. The results are presented such that they can be used to find the statistical uncertainty to use in Monte Carlo in order to achieve a desired precision in coupled simulation.
机译：耦合多物理场方法在提高计算精度方面起着重要作用。与确定性中子学代码相比，蒙特卡洛代码具有更高的分辨率级别的优势。在本文中，将三维连续能量蒙特卡洛反应堆物理燃耗计算代码Serpent与热工液压安全分析代码RELAP5结合在一起。基于OECD-NEA / NRC PWR MOX / U）_2核心瞬态基准，通过改进的UO_2和MOX单组装模型的轴向功率分布，证明了Serpent / RELAP5耦合的代码功能。使用耦合代码与确定性方法（特别是异构多组传输代码DeCART）的计算结果进行比较，结果表明耦合可以产生更精确的结果。基于蒙特卡罗代码中功率分布的统计不确定性，而不是先前研究中使用的临时标准，为耦合仿真开发了新的收敛标准。新的收敛标准显示更加严格，使用同样方便，但需要更多耦合步骤才能收敛。最后，量化了蒙特卡洛统计不确定性对功率和热工水力参数耦合误差的影响。给出了结果，以便可以将其用于查找要在蒙特卡洛中使用的统计不确定性，以便在耦合模拟中实现所需的精度。

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  • 来源
    《Annals of nuclear energy》 |2015年第1期|377-387|共11页
  • 作者

    Xu Wu; Tomasz Kozlowski;

  • 作者单位

    Department of Nuclear, Plasma and Radiological Engineering, University of Illinois at Urbana-Champaign, 224 Talbot Lab., 104 South Wright Street, Urbana, IL 61801, United States;

    Department of Nuclear, Plasma and Radiological Engineering, University of Illinois at Urbana-Champaign, 224 Talbot Lab., 104 South Wright Street, Urbana, IL 61801, United States;

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  • 正文语种 eng
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  • 关键词

    Monte Carlo; System thermal-hydraulics; Coupled simulation; Uncertainty quantification;

    机译：蒙特卡洛;系统热工液压;耦合模拟不确定度量化;

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