On line and global structural health monitoring of high temperature steam lines

该项目的目标是通过使用永久安装在管道工程上并始终提供100%管道覆盖率的连续结构健康监测系统，及早发现核电站过热蒸汽管道中的蠕变裂缝、疲劳裂缝和腐蚀变薄。该系统(ULTRASTEAMLINE)将通过创新地使用远程引导超声和干声耦合到在350℃下长寿命运行的压电换能器来工作。现有的停机检查实践留下了许多大型缺陷未被发现，因为100%的覆盖率仅在10年内达到。该系统的性能目标是检测和跟踪所有缺陷的增长&gt；占管壁横截面积的0.25%，理想情况下为&gt；0.05%，大大减少了大修时的检查需求和管道故障的发生，为每个反应堆计划和强制大修时间节省约3.5天。据估计，全球潜在的停电成本节约为GB 1.2 bnpa和UK/EEA ROI~54：1。要实现的主要创新是干声耦合和能够在高温下运行的换能器

The project aim is the early detection of creep cracking, fatigue cracking and erosion thinning in superheated steamlines in nuclear plants through the use of a continuous structural health monitoring system permanently installed on line pipe work and providing 100% pipe coverage at all times. This system (ULTRASTEAMLINE) will work through the innovative use of long range guided ultrasound with dry acoustic coupling to piezoelectric transducers with long life operation at 350C. Existing inspection practice at outages leaves many large defects undetected because 100% coverage is only reached over 10 years. The system performance target is to detect and track the growth of all defects > 0.25% of pipe wall cross sectional area and ideally > 0.05% , greatly reducing the need for inspection at outages, repairs and incidence of pipe failure , to save ~ 3.5 days per reactor pa of planned and forced outage time. Estimated potential global savings in outage costs are £1.2bnpa and the UK/EEA ROI ~ 54:1. pa.Major innovations to achieve are dry acoustic coupling and transducers able to perform at high temperstures