摘要
压水反应堆压力容器入口(Inlet)接管与筒体对接焊缝具有复杂的几何体特征,且焊缝超声检查区域在多种在役检查规范中定义不一致,这些因素导致其不可达区域呈非线性变化。为研究该区域的特殊变化规律,建立了Inlet接管与筒体焊缝参数模型,分析坡面特征导致的不可达区域仿真方法和分类判别法则。基于该法则,结合美国机械工程师学会(ASME)规范与核电厂相关参数,运用三维仿真软件采集接管组件不可达区域体积离散数据集,求取出左、右不可达区体积占比-超声折射角关系图,并介绍占比指标在相控阵和常规超声工艺的应用和优化方法。本研究以减少不可达区域并提高缺陷发现概率为目的,特别适用于相控阵和常规超声工艺在此类焊缝的不可达性和分布规律的数理研究。
The inlet nozzle to shell weld of PWR RPV has the characteristics of complicated geometry, while the definition of ultrasonic inspection area is different among several in-service inspection codes, and these above factors cause the inaccessible zones to show non-linearity change. In order to find the special changing rules, the parametric model of the nozzle weld was established, meanwhile the simulation method which caused by the slope feature was deeply analyzed, which help to deduce the discriminant criteria for the right-side inaccessible zones simulation. Based on the criteria, with typical parameters of the PWR RPV and ASME code, it is easier to acquire the mathematics diagram of the volume for both left-side and right-side inaccessible zones to refraction angle, with the help of lots of scattered data set by 3D simulation software. The diagram can interpret an optimization method for getting minimum inaccessible zone volume for phase array or conventional method. The research takes the advantage of increasing the chance of finding the ultrasonic defects, especially for the mathematic laws of accessibly and distribution of the phase array or conventional ultrasonic technics in same type of welds.
出处
《核动力工程》
EI
CAS
CSCD
北大核心
2017年第4期123-127,共5页
Nuclear Power Engineering
基金
国家863计划项目(2011AA040201)
关键词
马鞍形
不可达区域
复杂几何体
在役检查
Saddle shape, Inaccessible areas, Complex geometry, In-service inspection
