The VVER-640 Nuclear Power Plant design is being developed within the frames of the Russian federal program "Ecologically Clean Energy" and based on "Safety Features Improvement For Operating VVER NPP Program". The new generation VVER program based on evolutionary developing VVER-440 and VVER-1000. Main VVER program vendors were not changed from first unit project to new projects. All materials used in manufacturing the reactor vessel are certified and substantiated by a long-term operating experience: above four hundred of reactor-years.