In all technical areas, planning and design have been supported by ele
ctronic data processing for many years. New data processing tools had
to be developed for the European Pressurized Water Reactor (EPR). The
work to be performed was split between KWU and Framatome and laid down
in the Basic Design contract. The entire plant was reduced to a logic
al data structure; the circuit diagrams and flowsheets of the systems
were drafted the central data pool was established the outlines of bui
lding structures were defined, the layout of plant components was plan
ned and the electrical systems were documented. Also building construc
tion engineering was supported by data processing. The tasks laid down
in the Basic Design were completed as so-called milestones. Additiona
l data processing tools also based on the central data pool are requir
ed for the phases following after the Basic Design phase, i.e. Basic D
esign Optimization; Detailed Design; Management; Construction, and Com
missioning.