ULTRASONIC TESTING OF AUSTENITIC WELDS AT THE RUSSIAN NPP
Since 1997 Scientific and Production Center ECHO+ is maintaining automated ultrasonic testing of austenitic welds Du300 at the Russian NPP with RBMK reactors. Testing is executing with AUGUR series systems. The main feature of AUGUR system is a coherent data treatment and measurement of real flaw size. On the NPP units under exploitation were inspected more then 10 000 welded joints Du300. Comparison between flaws sizing by AUGUR methodology and by metallographic investigation was completed and absolute height sizing error was less than ±2 mm in 95% confidence interval. UT with coherent treatment allowed to proceed monitoring of flaws and to make planning of NPP maintenance more flexible. With a new generation system AUGUR 5.2 since 2004 is maintaining testing of welds on steam generators sockets: composite socket weld Du1100 of VVER 440 steam generator and perlitic socket weld Du1200 of VVER 1000 steam generator. In these welds were detected intolerable flaws and comparison between UT and metallographic data shown good agreement. Recently inspection procedures for a various austenitic welds were developed: Du200 pipeline welds, Du500 primary circuit pipeline longitudinal and circular welds, primary circuit pipeline and main shutoff valve socket weld, ring of main circuit pump socket weld, welded joints of turbine house, welded joints of pressure compensator. All procedures were validated on mock-ups with real and realistic flaws. This paper presents main stages of inspection procedures validation, peculiarities of UT with AUGUR 5.2 system and examples of flaws sizing.
ultrasonic testing coherent treatment FT-SAFT austenitic welds
Vladimir G. BADALIAN Аlexey Kh. VOPILKIN Pavel F. SAMARIN Dmitry S.TIKHONOV
SPC ECHO+, Moscow, Russia
国际会议
第十七届世界无损检测会议(17th World Conference on Nondestructive Testing)
上海
英文
1383-1388
2008-10-25（万方平台首次上网日期，不代表论文的发表时间）