Identification of defects in the metal of weld of the case of steam generator to the collector on the WWER-1000

In the metal of the weld of the node connecting of collector with case of steam generator for power units of VVER-1000 by ultrasonic method found defects. Location defects also confirmed by the existence of stress concentration, which are identified by magnetic memory method and coercimetry method. Metallographic method has been established that defects are pores and also cracks, which formed by non-metallic inclusions. Microprobe analysis showed that non-metallic inclusions are silicon carbide SiC. The influences of the defects found on the working resource of the weld have been considered in the text