Prediction Model for Growth of Chalk River Unidentified Deposit on the Surface of PWR Fuel Cladding
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摘要: 为建立压水堆燃料棒包壳表面氧化腐蚀产物沉积层（CRUD）厚度的预测方法，本文以典型压水堆一回路为研究对象，针对压水堆内水化学和物理条件对CRUD沉积的影响，建立了CRUD沉积生长模型。模型预测结果与Sizewell B核电厂实际运行数据相比具有相同的生长量级和趋势，可用于压水堆燃料棒包壳CRUD沉积行为的定量预测。在此基础上，本文研究了热流密度、H2浓度以及Li+浓度对腐蚀产物生长的影响，结果表明：燃料元件表面非沸腾段CRUD厚度受热流密度变化的影响较小，而沸腾段CRUD厚度随热流密度上升而增加；CRUD厚度随着系统H2浓度的提高而增加；提高系统内Li浓度有助于抑制氧化腐蚀产物的沉积。
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关键词:
- 压水堆 /
- 燃料棒包壳 /
- 氧化腐蚀产物沉积层（CRUD） /
- 沉积生长模型
Abstract: In order to establish a prediction method for the thickness of chalk river unidentified deposit (CRUD) on the surface of PWR fuel cladding, this paper takes the primary circuit of typical PWR as the research object. Aiming at the influence of water chemistry and physical conditions in PWR on CRUD, a deposition model is established. Compared with the actual operation data of Sizewell B nuclear power plant, the predicted results of the model have the same growth order and trend, which indicates that the model can be used to quantitatively predict the thickness of CRUD on the surface of PWR fuel cladding. The effects of heat flux, H2 and Li concentration on the accumulation of corrosion products are studied, the predicted results show that the CRUD thickness of the non-boiling section is less affected by the heat flux, while the CRUD thickness of the boiling section increases with the increase of heat flux. The CRUD thickness increases with the increase of H2 concentration, and the increase of Li concentration in the system is helpful to restrain the deposition of oxidation corrosion products. -
图 1 堆芯内氧化腐蚀产物输运方式
Figure 1. Transport Mode of Oxidation and Corrosion Products in the Core
图 2 CRUD厚度随热流密度变化计算值与Sizewell B核电厂测量值对比图
Figure 2. Comparison between Calculated CRUD Thickness and Measured Values of Sizewell B Plant
图 3 CRUD厚度与热流密度关系图
Figure 3. Relationship between CRUD Thickness and Heat Flux Density
图 4 不同Li+和H2浓度下CRUD厚度对比
Figure 4. CRUD Thickness Comparison under Different Li and H2 Concentrations
表 1 Sizewell B核电厂一回路参数
Table 1. Parameters of Sizewell B PWR Primary Circuit
参数 数值 污垢密度/(kg·m−3) 1000 冷却剂体积流量/(m3·s−1) 25.9 堆芯高度/m 3.7 燃料表面积/m2 9905 冷却剂流速/(m·s−1) 1.8 堆芯有效直径/m 2.15 堆芯体积/m3 13.2 燃料表面沸腾段比例/% 5 
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表 2 堆芯各区域温度以及pH值
Table 2. Temperature and pH Values of Core Area
区域编号 温度/℃ pH值 Box1 280 6.80 Box2 300 6.90 Box3 345 7.54 Box4 300 6.90 Box5 345 7.54 Box6 320 7.20
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