Containments for nuclear power stations

The containments for PWRs are outstanding examples of recent achievements in the design and construction of pressure vessels with regard to stress analysis, detail design, fabrication and quality control. Steel grades with exceptional mechanical properties have been used to meet the increasingly stringent demands imposed with regard to safety. Close temperature control is required before and during welding if the steel is to be successfully welded and if the quality of the welds and of the heat affected zone is to meet requirements. An elaborate quality and assurance procedure involving extensive documentation ensures that high standards are maintained in plate manufacture, fabrication, welding and assembly. (orig.)