AP1000正常余热排出系统低压注射性能分析

为分析AP1000核电厂中正常余热排出系统（RNS）的低压注射性能，本文保守假定低压注射工况下反应堆冷却剂系统的压力和阻止堆芯补水箱水位继续下降的最小注射流量要求恒定不变。在此基础上，结合RNS低压注射管路的布置信息和正常余热排出泵的性能曲线，计算分析了RNS在向反应堆冷却剂系统进行低压注射的工况下分别从安全壳内置换料水箱和装料池两个水源吸水时该系统的低压注射性能（主要借助注射流量和注射可持续时间两个性能参数进行衡量）。通过上述计算分析，本文不仅验证AP1000 RNS低压注射功能设计的可靠性，同时也定量给出了两个低压注射水源的实际注射容量。

Low Pressure Injection Performance Analysis of Normal Residual Heat Removal System in AP1000

The low pressure injection performance of normal residual heat removal system (RNS) in AP1000 nuclear power plant was analyzed. It is conservatively assumed that under low pressure injection condition, the pressure of reactor coolant system and the minimum injection flow required to prevent the water level drop of core make up tank remain constant. Combined with the layout of RNS low pressure injection pipes and the performance curve of RNS pumps, the low pressure injection performances of RNS in suction from the in-containment refueling water storage tank and cask loading pit were analyzed, respectively. The injection flow and the injection last time are two parameters to evaluate the performance of RNS. Through the analysis, not only the reliability of RNS’s low pressure injection function is verified, but also the actual injection capacity of the two water-sources is quantitatively given.