Principles for establishing and implementing QA programmes during all phases of design, procurement, fabrication, construction, commissioning, operation, maintenance and decommissioning of structures, systems and components of nuclear installations such as nuclear power plants, fuel fabrication, processing and reprocessing plants and fuel storage facilities. These principles underline activities affecting the quality of items such as designing, purchasing, fabricating, handling and shipping, storing, cleaning, erecting, installing, testing, commissioning, etc.