AP1000冷却剂回路主管道流场分析

Analysis on AP1000 Reactor Coolant Loop Piping Flow Field

AP1000反应堆冷却剂系统设计中采用经典的流动阻力计算公式,计算了反应堆冷却剂回路主管道阻力。但由于主管道的管径非常大,而且管道内有热电偶测量元件、勺形件等部件,采用公式计算阻力可能误差较大。另外,由于主管道上带有ADS第四级接管嘴、稳压器波动管接管嘴等大口径管嘴,引起的流场不稳定性对热段弯管流量计的精度有影响。因此,需要对主管道内的整体流场进行研究,从而较精确计算主管道阻力,并为主管道结构设计提供依据。文章采用三维CFD软件Fluent分析AP1000主管道内的流场,获得了比较准确的主管道阻力计算结果,并验证了热段弯管流量计布置位置的合理性。

APIO00 reactor coolant pipe flow resistance is calculated by classical piping flow resistance formula calculation method. As the size of reactor coolant loop pipe is very big and there are thermal resistance temperature detectors and pressurizer spray scoops which will influent the piping flow field, therefore the tolerance of formula calculation method may be big. What＇ s more, with the influence of large bore of ADS 4th and surge line on hot leg, the flow instability will influent the precision of elbow flow rate instrument. For this issue, it is necessary to analyze the integral flow field of reactor coolant loop pipe to get the precise flow resistance and provide basis for structural design. This article considers using Fluent as the CFD flow field analysis tool. The flow resistance analysis result is precise and the hot leg bent flow instrument design is reasonable. AP1000 reactor coolant loop piping flow field is acceptable.