Long-term activation potential of the steel eurofer as structural materialof a demo breeder blanket

The long-term activation behavior of the martensitic-ferritic steel Eurofer 97 as structural material for fusion reactors has been investigated on the basis of activation calculations for the European Union (EU) helium-cooled pebble bed (HCPB) outboard DEMO blanket. Activation calculations were perf ormed with the FISPACT-97 inventory code and EAF-97 activation cross-sectio n data for three representative positions at the outboard first wall, the c entral part and the back wall of the EU-HCPB DEMO blanket. All stable eleme nts were taken into account as impurity elements. Radial dependent values a nd blanket averages were derived for the permissible impurity element conce ntrations to arrive at an Eurofer 97 gamma dose rate below the hands-on lev el after a cooling time of 200 years. (C) 2000 Elsevier Science B.V. All ri ghts reserved.