Research on multi-objective optimization method for flow distribution of natural circulation reactor during its life-cycle
Research on multi-objective optimization method for flow distribution of natural circulation reactor during its life-cycle
复制标题
自然循环反应器全生命周期流量分布多目标优化方法研究
DOI：
10.1016/j.anucene.2022.109266
复制
发表时间：
2022-10
影响因子：
1.9
通讯作者：
Tao Yu
中科院分区：
文献类型：
--
作者：
Enping Zhu;Qi Chen;Pengcheng Zhao;Yanan Zhao;Yumeng Sun;Zijing Liu;Tao Yu
·在封闭并行多通道模型的基础上，建立了局部最优流量分配计算模型。·提出了一种基于最优时区的多目标综合评价方法。·研究了长寿命自然循环小型铅铋快堆的流量分配方案。合理的流量分配可以使堆芯出口温度分布趋于平缓，减小温度波动，提高堆的经济性和安全性。与强制循环堆不同，自然循环堆的流量分配是根据燃料组件功率与入口阻力的关系自动调节的。在这项工作中，首先，局部最优流量分配计算模型的基础上建立了封闭的并行多通道模型。其次，提出了一种基于最优时间区间的多目标综合评价方法，以寻求满足整个生命周期内多种需求的最优流量分配方案。第三，研究了长寿命自然循环小型铅铋快堆（SPALLER-100）的流量分配方案。选择逼近理想解排序法（TOPSIS）作为评价方法，采用三个评价指标进行计算。最后，选择子信道码对流量分配方案进行验证。分析结果表明，基于3182天功率分布的方案性能最好。与寿命初期设计方案相比，最大出口温差降低了30 K，最大出口温差的标准偏差降低了41%，最大输出功率提高了2.35%。计算结果与SUBCHANFLOW程序计算结果吻合较好，最大相对误差小于4.5%。
• A local optimal flow distribution calculation model is constructed based on the closed parallel multi-channel model. • A multi-objective comprehensive evaluation based on the optimal time zone is proposed. • The flow distribution scheme of a small lead-bismuth fast reactor with long life and natural circulation is studied. A reasonable flow distribution can flatten the temperature distribution at the core outlet and reduce the temperature fluctuation, improving the economy and safety of the reactor. Different from a forced circulation reactor, the flow distribution of a natural circulation reactor is automatically adjusted according to the relationship between the fuel assembly power and inlet resistance. In this work, first, a local optimal flow distribution calculation model is constructed based on the closed parallel multi-channel model. Second, a Multi-objective comprehensive evaluation based on the optimal time zone is proposed to find an optimal flow distribution scheme that satisfies multiple requirements during the entire life-cycle. Third, the flow distribution scheme of a small lead-bismuth fast reactor with long life and natural circulation (SPALLER-100) is studied. The Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) algorithm is chosen as the evaluation method with three evaluating indicators for calculation. Ultimately, the subchannel code is selected to verify the flow distribution scheme. The analysis results show that the scheme based on the power distribution of 3182 days performs the best. Compared with the scheme designed by the beginning of life (BOL), the maximum outlet temperature difference reduced by 30 K, the standard deviation of the maximum outlet temperature difference reduced by 41%, and maximum output power increased by 2.35%. The results are in good agreement with the SUBCHANFLOW code, and the maximum relative error is less than 4.5%.