跨间交混格架对EPR堆芯DNBR裕量的影响

Effect of Mid Span Mixing Grid on EPR Core DNBR Margin

摘要: 采用FLICA Ⅲ-F子通道程序，分析了AFA 3GLE燃料组件加装跨间交混格架（MSMG）后对台山EPR堆芯热工参数和最小DNBR的影响。分析结果表明，在名义工况下加装MSMG后，轴向功率呈余弦分布和轴向功率偏差AO=+9%将分别提高EPR堆芯的DNBR裕量约为24%和28%，同时增加EPR堆芯压降约10.1%。

Abstract: The effect of mid span mixing grid (MSMG) on the EPR core thermal-hydraulic parameters and minimum DNBR was analyzed by employing FLICA Ⅲ-F sub-channel code. The results show that DNBR margin of EPR core can be improved respectively about 24% and 28% for normal condition with cosine and AO equal to +9% power distributions by adding 4 MSMGs on AFA 3GLE fuel assembly, while thenpressure drop in EPR core increases about 10.1%.