定位格架是压水堆燃料组件的重要部件,其设计优劣直接影响到反应堆的经济性和安全性。方形定位格架设计与研究历时八年之久,先后设计出几种结构形式的定位格架。热工、水力和力学等堆内外试验证明,其中一些结构形式的定位格架基本满足设计要求,在定位格架上方设置交混翼,使热工性能明显改善,与无交混翼格架相比,临界热流密度提高20%以上,这些定位格架均可以在工程上使用。 Positioning grid is an important component of pressurized water reactor fuel assembly, the design of the merits of a direct impact on the reactor economy and safety. The design and research of square positioning grids lasted for eight years and successively designed several positioning grids of structural forms. Thermal, hydraulic and mechanical tests inside and outside the pile prove that some of the structural forms of the positioning grid basically meet the design requirements, the positioning grid above the set of mixing wing, so that thermal performance improved significantly, and the non-mixed wing grid phase Than, critical heat flux density increased by more than 20%, these positioning grid can be used in engineering.