Fracture mechanism of a dissimilar metal welded joint in nuclear power plant

2013 ◽  
Vol 28 ◽  
pp. 134-148 ◽  
Author(s):  
H.T. Wang ◽  
G.Z. Wang ◽  
F.Z. Xuan ◽  
S.T. Tu
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Fracture Mechanism ◽  
Nuclear Power ◽  
Welded Joint ◽  
Dissimilar Metal

Effect of a Single Overload on the Fracture Behavior in Safe-End Dissimilar Metal Welded Joints in Nuclear Power Plant

2014 ◽  
Vol 1049-1050 ◽  
pp. 600-604
Author(s):  
He Xue ◽  
Yuan Kui Gui ◽  
Wei Bing Wang ◽  
Xiao Bo Li ◽  
Ying Ru Wang ◽  
...  
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Tensile Stress ◽  
Pressure Vessel ◽  
Welded Joints ◽  
Nuclear Power ◽  
Fracture Behavior ◽  
Welded Joint ◽  
Dissimilar Metal ◽  
Single Overload

To understand the effect of a single overload on the fracture behavior in welded joints, the stress and strain field at the crack tip in a safe-end dissimilar metal welded joint in nuclear pressure vessel is simulated and analyzed by using the elastic-plastic finite element method in the paper, in which the mechanical heterogeneity in welded joint is emphatically considered. The investigating results indicate that the tensile plastic strain at crack tip increases, but the tensile stress decreases as a single overload increases, and the influence of a single overload on tensile strain is larger than one on tensile stress, which provide a theoretical basis for quantitatively estimating the crack growth rate of environmentally assisted cracking in the welded structural material of pressure vessel and piping in the nuclear power plant.

Full Structural Weld Overlay on a Super Emergency Feedwater Nozzle at the Dukovany Nuclear Power Plant

2019 ◽  
Author(s):  
Steven L. McCracken ◽  
Marek Palán ◽  
Pavel Mlynář ◽  
Nicholas Mohr
Keyword(s):  
Czech Republic ◽  
Power Plant ◽  
Nuclear Power Plant ◽  
Nuclear Power ◽  
The Czech Republic ◽  
Weld Overlay ◽  
Nondestructive Examination ◽  
Dissimilar Metal ◽  
Dissimilar Metal Weld ◽  
Metal Weld

Abstract A weld overlay (WOL) following the general guidelines of ASME Code Case N-740-2 was successfully installed in March of 2018 on a dissimilar metal weld joining the super emergency feedwater1 piping to steam generator (SG) at the Dukovany nuclear power plant (NPP) in the Czech Republic. The repair was necessary due to stress corrosion cracking detected in the super emergency feedwater nozzle to safe-end dissimilar metal weld. This was the first WOL installed in the Czech Republic and represents a significant step towards further acceptance of this proven repair technology in Europe. The WOL repair approach was accepted by the Czech regulator, and two different inspection agencies, following successful mockup demonstrations, welding procedure qualification, nondestructive examination demonstrations and weld residual stress analyses. This paper describes the preparatory work as well as field deployment of WOLs in the Czech Republic.

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