Main suppliers and equipment vendors that own the technology play a relevant role in the first NPP project in transferring the technology know-how.

Equipment manufacturing is the largest block of man-hours in a nuclear project, approximately 20 million man-hours for a 1000 MWe plant. The overall manpower requirements for the manufacture of equipment and components are estimated to be of the order of 3000 professionals, techni­cians and craftsmen.

Construction companies

Depending on the difficulties of the particular site, the tasks to be per­formed for site preparation will require normally 50 to 150 craftsmen and labourers during this stage as well as 10 to 20 professionals and managers, who have previously performed similar duties. The number of craftsmen and labourers could increase by as much as a factor of five for exceptionally difficult sites, taking into account that the above tasks should be completed as quickly as possible.

Usually the peak of concrete work occurs during the first year of con­struction and the peak for interior finish and masonry work is in the third year. The overall manpower requirements for civil construction will gener­ally peak during the second and third year of construction after which they will gradually decline.

To coordinate, manage and expedite component installation requires an experienced team at the site of at least 25 professionals during the peak period.

For equipment, component and systems erection and installation, a peak workforce (about four years after construction starts or earlier with the advanced reactor construction) of the order of 1300 people would be required. Many of the welders must be qualified for specialized cover-gas equipment. For difficult sites (climate, high rate of personnel turnover, low worker efficiency) the overall quantity of manpower could be 20-50% higher, or it can easily double.