Numerical Research on Anti-corrosion Properties of Rod Bundle Channel
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摘要: 为获得先进反应堆中燃料组件通道表面防腐蚀层的生成情况，以对反应堆运行策略分析提供支撑，本文提出了一套棒束通道中氧输运分析计算模型，结合计算流体动力学方法，对燃料组件典型19棒束通道内的防腐蚀层生成情况进行了分析。获得了棒束通道内的流场、温度场以及两种入口氧浓度、三种运行时间下的棒束氧浓度分布情况以及棒束表面防腐蚀层的生成情况。研究结果表明，棒束通道中防腐蚀层的生成主要与温度、初始氧浓度以及运行时间有关，对于现有模型来说，定距条与棒接触点附近是防腐蚀层难以形成的主要区域，需要重点关注。本文的计算方法及结果将对反应堆运行策略评价提供支撑。Abstract: In order to obtain the formation of anti-corrosion layer on the surface of fuel assembly channels in advanced reactors and provide support for the analysis of reactor operation strategy, this paper puts forward an oxygen transport calculation model, and combined with Computational Fluid Dynamics method, the anti-corrosion layer generated in typical 19-rod bundle channels of fuel assemblies is analyzed. The flow field and temperature field in the rod bundle channel, the oxygen concentration distribution of the rod bundle under two kinds of inlet oxygen concentrations and three kinds of operation time, and the formation of the anti-corrosion layer on the rod bundle surface are obtained. The results show that the anti-corrosion layer in the bundle channel is mainly related to the temperature, initial oxygen concentration and operation time. For the existing model, the vicinity of the contact point between spacer and rod is the main area where the anti-corrosion layer is difficult to form, which needs to be paid attention to. The calculation method and results in this paper will provide support for the evaluation of reactor operation strategy.
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Key words:
- Reactor core /
- Anti-corrosion /
- Heat and mass transfer
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图 5 入口氧浓度随运行时长变化规律
Figure 5. Variation of Inlet Oxygen Concentration with Operation Time
图 6 轴向截面上的氧浓度分布（入口氧浓度8×10−9wt%，运行时间60 s）
Figure 6. Oxygen Concentration Distribution on Axial Section (Inlet Oxygen Concentraion: 8×10−9wt%, Operation Time: 60 s)
图 7 轴向截面上的氧浓度分布（入口氧浓度8×10−9wt%，运行时间24 h）
Figure 7. Oxygen Concentration Distribution on Axial Section (Inlet Oxygen Concentraion: 8×10−9wt%, Operation Time: 24 h)
图 8 轴向截面上的氧浓度分布（入口氧浓度2×10−8wt%，运行时间60 s）
Figure 8. Oxygen Concentration Distribution on Axial Section (Inlet Oxygen Concentraion: 2×10−8wt%, Operation Time: 60 s)
图 9 轴向截面上的氧浓度分布（入口氧浓度2×10−8wt%，运行时间24 h）
Figure 9. Oxygen Concentration Distribution on Axial Section (Inlet Oxygen Concentraion: 2×10−8wt%, Operation Time: 24 h
图 10 定距条与壁面接触点的氧浓度分布（入口氧浓度8×10−9wt%，运行时间24 h）
Figure 10. Oxygen Concentration Distribution at Contact Point between Spacer and Wall (Inlet Oxygen Concentration: 8×10−9wt%, Operation Time: 24 h)
图 11 中心元件棒壁面氧化层生成情况（入口氧浓度8×10−9wt%，运行时间60 s）
Figure 11. Oxide Layer Formation on Central Fuel Rod Wall (Inlet Oxygen Concentration: 8×10−9wt%, Operation Time: 60 s)
图 12 角通道附近元件棒壁面氧化层生成情况（入口氧浓度8×10−9wt%，运行时间60 s）
Figure 12. Oxide Layer Formation on Fuel Rod Wall near Corner Channels (Inlet Oxygen Concentration: 8×10−9wt%, Operation Time: 60 s)
图 13 中心元件棒壁面氧化层生成情况（入口氧浓度8×10−9wt%，运行时间10 min）
Figure 13. Oxide Layer Formation on Central Fuel Rod Wall (Inlet Oxygen Concentration: 8×10−9wt%, Operation Time: 10 min)
图 14 角通道附近元件棒壁面氧化层生成情况（入口氧浓度8×10−9wt%，运行时间10 min）
Figure 14. Oxide Layer Formation on Fuel Rod Wall near Corner Channels (Inlet Oxygen Concentration: 8×10−9wt%, Operation Time: 10 min)
图 15 中心元件棒壁面氧化层生成情况（入口氧浓度8×10−9wt%，运行时间10 min）
Figure 15. Oxide Layer Formation on Central Fuel Rod Wall（Inlet Oxygen Concentration: 8×10−9wt%, Operation Time: 10 min）
图 16 角通道附近元件棒壁面氧化层生成情况（入口氧浓度8×10−9wt%，运行时间24 h）
Figure 16. Oxide Layer Formation on Fuel Rod Wall near Corner Channels (Inlet Oxygen Concentration: 8×10−9wt%, Operation Time: 24 h)
图 17 中心元件棒壁面氧化层生成情况（入口氧浓度2×10−8wt%，运行时间60 s）
Figure 17. Oxide Layer Formation on Central Fuel Rod Wall (Inlet Oxygen Concentration: 2×10−8wt%, Operation Time: 60 s)
图 18 角通道附近元件棒壁面氧化层生成情况（入口氧浓度2×10−8wt%，运行时间60 s）
Figure 18. Oxide Layer Formation on Fuel Rod Wall near Corner Channels (Inlet Oxygen Concentration: 2×10−8wt%, Operation Time: 60 s)
图 19 中心元件棒壁面氧化层生成情况（入口氧浓度2×10−8wt%，运行时间10 min）
Figure 19. Oxide Layer Formation on Central Fuel Rod Wall (Inlet Oxygen Concentration: 2×10−8wt%, Operation Time: 10 min)
图 20 角通道附近壁面氧化层生成情况（入口氧浓度2×10−8wt%，运行时间10 min）
Figure 20. Oxide Layer Formation on Fuel Rod Wall near Corner Channels (Inlet Oxygen Concentration: 2×10−8wt%, Operation Time: 10 min)
图 21 中心元件棒壁面氧化层生成情况（入口氧浓度2×10−8wt%，运行时间24 h）
Figure 21. Oxide Layer Formation on Central Fuel Rod Wall (Inlet Oxygen Concentration: 2×10−8wt%, Operation Time: 24 h)
表 1 棒束计算模型参数
Table 1. Parameters of Rod Bundle Calculation Model
几何参数 数值 棒束数量 19 棒束外径/mm 8.2 组件盒壁面间距/mm 10.49 棒束节距/mm 10.58 加热段长度/mm 870 
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