CONCEPTUAL DESIGN OF A HELIUM COOLED SOLID BREEDER BLANKET BASED ON THE USE OF A MIXED BED OF BERYLLIUM AND Li4SiO4 PEBBLES

So far the Karlsruhe ceramic breeder design for a Demo relevant blanket has been based on the use of Li 4 SiO 4 pebbles placed in gaps between beryllium plates. Data on the swelling of beryllium under irradiation at high temperatures are very uncertain. On the base of the most pessimistic data the peak beryllium swelling might be too high for this design. In this paper an alternative design is presented, which can cope with this large swelling. The design is based on the use of a mixed bed of 2 mm beryllium and 0.1 to 0.2 mm beryllium and Li 4 SiO 4 pebbles.