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用于AP1000型核电站核级主设备厚壁焊缝的相控阵超声检验技术研究

2018-07-28杨勇巩希德夏中杰

科技视界 2018年12期

杨勇 巩希德 夏中杰

【摘 要】AP1000核电机组是目前国际上先进的第三代核电机组,按照ASME规范要求,核级设备(例如:蒸发发生器等)的焊縫需要进行超声检验,而这类焊缝均有厚壁较厚等特点。目前,在国内均使用常规手动超声方式进行检验,效率相对较低且受人因因素影响较大的问题。近年来相控阵超声技术发展迅速,有着检验效率高、信号直观等优点。目前国内还未开始设备厚壁焊缝相应相控阵超声的验证和应用相关工作。本文通过研究和试验,形成了一套适用于AP1000核级主设备厚壁焊缝的相控阵超声检查方法。

【关键词】AP1000;核级主设备;厚壁焊缝;相控阵超声检验

中图分类号: TM623 文献标识码: A 文章编号: 2095-2457(2018)12-0007-003

DOI:10.19694/j.cnki.issn2095-2457.2018.12.003

Research on phased array ultrasonic testing technology for thick wall weld of nuclear grade main equipment of AP1000 nuclear power plant

YANG Yong GONG Xi-de XIA Zhong-jie

(China Nuclear Power Operation Technology Corporation, LTD, Wuhan Hubei 430223, China)

【Abstract】AP1000 nuclear power unit is the advanced third generation nuclear power unit in the world. According to the requirements of ASME specification, the weld of nuclear grade equipment (such as evaporation generator, for example) needs ultrasonic inspection, and the thick wall of this kind of weld has the characteristics of thick wall. At present, the conventional manual ultrasonic testing method is used in China, which is relatively inefficient and is influenced by human factors. In recent years, phased array ultrasonic technology has developed rapidly, and has the advantages of high efficiency and intuitive signal. At present, there is no work on the verification and application of phased array ultrasonic for thick wall weld in China. Through research and experiment, a phased array ultrasonic inspection method suitable for thick wall weld of AP1000 nuclear grade main equipment has been formed.

【Key words】AP1000; Nuclear class main equipment; Thick wall welds; Phased array ultrasonic examination

0 引言

根据ASME规范,AP1000型核电站核级主设备筒体焊缝需要进行超声检验,由于焊缝位于核一回路压力边界,一般厚壁都较厚。国内对于现有此类厚壁焊缝的役前和在役检查,除AP1000机组少量特定焊缝采用了自动常规超声检验,其他多数焊缝普遍采用手动常规超声方式进行检验。相控阵超声检验技术由其特殊的超声波发射方式,可同时形成多角度的扇形扫查[1],以一个相控阵探头同时替代多个常规超声探头,从而能够高效的完成检验任务。

目前,在核电无损检测领域,相控阵超声还处于小范围使用的状态[2-3],仅在核级管道和部分自主项目上有所应用。国内还未开始设备厚壁焊缝相应相控阵超声的验证和应用相关工作。

1 设备厚壁焊缝相控阵超声检验技术

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