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首页> 外文期刊>Journal of nuclear engineering and radiation science >A Simplified Two-Group Multipoint Kinetics Model
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A Simplified Two-Group Multipoint Kinetics Model

机译：简化的两组多点动态电机模型

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Detailed multiphysics modeling of nuclear power plants has become a necessity in the era of best-estimate analysis. For a number of transients with strong coupling between the neutronics in the reactor core and the fluid-dynamics in the primary circuit and overall heat transfer, it is required to carry out coupled system thermal hydraulics and core three-dimensional (3D) neutronics analysis. Point kinetics approach in the system thermal-hydraulics (TH) code RELAP5 limits its use for many reactivity-induced transients, which involve asymmetric core behavior. In a recent development, a simplified multipoint kinetics model has been coupled with system TH code RELAP5 to circumvent its inadequacy for the analysis of reactivity-induced transients involving asymmetric core behavior. The objective of this paper is to validate the simplified multipoint kinetics model against an asymmetric fast transient benchmark problem in a large power reactor. Time-step and nodalization sensitivity studies have been performed. It is demonstrated that the multipoint kinetics model results are in good agreement with the benchmark, advocating its applicability.
机译：在最佳估计分析时代，对核电站进行详细的多物理建模已成为必要。对于反应堆堆芯中子学与一回路流体动力学和整体传热之间存在强耦合的若干瞬态，需要进行耦合系统热工水力学和堆芯三维（3D）中子学分析。系统热工水力学（TH）代码RELAP5中的点动力学方法限制了其在许多反应性诱发瞬态中的使用，这些瞬态涉及不对称堆芯行为。在最近的一项发展中，简化的多点动力学模型已与系统TH代码RELAP5耦合，以避免其在分析涉及不对称堆芯行为的反应性诱发瞬变时的不足。本文的目的是针对大功率反应堆中的非对称快速瞬变基准问题验证简化的多点动力学模型。进行了时间步长和节点化敏感性研究。结果表明，多点动力学模型的计算结果与基准测试结果吻合较好，具有一定的适用性。

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