华龙一号包络功率形状验证方法研究

堆芯功率分布可用径向功率分布和轴向功率分布分别描述，功率分布对堆芯偏离泡核沸腾（DNB）具有较高的重要性。核电厂在运行过程及事故过程中可能出现的功率分布各不相同，为有效简化热工水力设计及事故分析所需的功率形状，根据事故过程中功率分布的变化程度以及核电厂保护系统特性，将事故分析所需的极限功率形状分类包络。根据华龙一号的保护系统设置，以堆芯功率能力分析方法为基础，介绍了华龙一号工况Ⅰ包络功率形状和参考功率形状的验证方法。计算结果表明，工况Ⅰ包络功率形状和参考功率形状分别为各自适用场景下的包络功率形状。结果不仅有助于工程设计人员快速理解包络功率形状的验证方法，也有利于包络功率形状在后续事故分析中合理使用。

Investigation in Verification of Limiting Power Shape in HPR1000

The core power distribution which is composed of radial power distribution and axial power distribution is of greater importance for departure from nucleate boiling (DNB) analysis. The power shapes differ from one another during normal operation and accident condition. In order to simplify analysis of each accident condition, the limiting power shape is used to bound the core power distribution according to the change of core power distribution due to accident condition and the characteristics of protection system of nuclear power plant. Based on the protection system of HPR1000 and core power capability analysis methodology, the investigation in verification of limiting power shape in HPR1000 was introduced. The results show that the design power shape bounds the core power distributions in category I and the reference power shape bounds the core power distributions in accident conditions protected by the over temperature ΔT protection system. The results not only assist engineers to understand the verification method of limiting power shape, but also are helpful for properly use of limiting power shape in accident analysis.