Grid designs with mixing elements for VVER FA and experimental studies of their thermohydraulic and mass transfer characteristics are analyzed. The Novosibirsk Chemical Concentrates Plant and the Machine Building Plant manufacture the grids. Comparative assessments of the coolant mixing intensity, increase of the critical heat flux and critical power, and coefficient of hydraulic resistance are made on the basis of studies performed on VVER FA models with mixing grids as well as with and without mixing spacer grids. It is shown in FA models that mixing grids used in the advanced TVS-2M and TVSA assemblies increases the critical power for operating parameters close to the nominal VVER-1000 FA by 5.1–14% and 10–12%, respectively.

中文翻译：

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用于 VVER 燃料组件的带有混合元件的网格

分析了用于 VVER FA 的带有混合元件的网格设计及其热工水力和传质特性的实验研究。新西伯利亚化学浓缩厂和机械制造厂制造网格。冷却剂混合强度、临界热通量和临界功率的增加以及水力阻力系数的比较评估是在对带有混合网格以及带有和不带有混合间隔网格的 VVER FA 模型的研究的基础上进行的。FA 模型显示，高级 TVS-2M 和 TVSA 组件中使用的混合网格将接近标称 VVER-1000 FA 的运行参数的临界功率分别提高了 5.1-14% 和 10-12%。