L Giancarli et al. Fusion Engineering and Design 61-62(2002)307-318 the plasma side <1100C, the maximum tem- pressurization, (2) close between fiber perature of the breeder pebble 1000C, and the and matrix, (3)possibility of complex shaping On net thermal efficiency >45%. the other hand, treating time is long and there is less experience. The fabrication process using the CVI method is as follows 4.3. Manufacturing and mounting scheme 1) fabricating textile preform of structural parts The blanket module fabricated by the unit of the module forming method is shown in Fig. 6. The process 2) densification by CVD in furnace to get dense SiCSic composite 1) assembling the cooling ring(low-temperature 3)machining and finishing pipe) which is divided into several parts The use of Sic coatings may be also needed to 2)temporary setting of branch high-temperature rovide He-hermeticity 3)inserting the high-temperature pipe and con- necting with the branch pi 4)completing the ring by joining the divided parts 5. Main requirements for other in-vessel 5)fixing the blanket module to the ring with components 4 bolts using the maintenance hole 6) closing the maintenance hole with the lid Other important in-vessel components are the divertor and shield. As a consequence of the The structural material, SiC!SiC composite, selected reactor strategy, as discussed in Section must be treated to get high density. There are 2, Pb-17Li coolant should be used for compo two methods to compose ceramics matrix directly nents associated with SCLl blankets, and He- from gaseous raw materials: CVD and CVI. The coolant for components associated VI method has advantages such as (1)no cooled ceramic beryllium blankets with helium First Wall 原a Exhaust Textile Preform →( Densification Machining &Finishi Fig. 6. Manufacturing process of a DREAM blanket module.the plasma side B/1100 8C, the maximum tem￾perature of the breeder pebble B/1000 8C, and the net thermal efficiency
/45%. 4.3. Manufacturing and mounting scheme The blanket module fabricated by the unit￾forming method is shown in Fig. 6. The process is as follows: 1) assembling the cooling ring (low-temperature pipe) which is divided into several parts 2) temporary setting of branch high-temperature pipes 3) inserting the high-temperature pipe and con￾necting with the branch pipes 4) completing the ring by joining the divided parts 5) fixing the blanket module to the ring with bolts using the maintenance hole 6) closing the maintenance hole with the lid. The structural material, SiCf/SiC composite, must be treated to get high density. There are two methods to compose ceramics matrix directly from gaseous raw materials: CVD and CVI. The CVI method has advantages such as (1) no pressurization, (2) close adherence between fiber and matrix, (3) possibility of complex shaping. On the other hand, treating time is long and there is less experience. The fabrication process using the CVI method is as follows: 1) fabricating textile preform of structural parts of the module 2) densification by CVD in furnace to get dense SiCf/SiC composite 3) machining and finishing The use of SiC coatings may be also needed to provide He-hermeticity. 5. Main requirements for other in-vessel components [4] Other important in-vessel components are the divertor and shield. As a consequence of the selected reactor strategy, as discussed in Section 2, Pb/17Li coolant should be used for compo￾nents associated with SCLL blankets, and He￾coolant for components associated with helium￾cooled ceramic beryllium blankets. Fig. 6. Manufacturing process of a DREAM blanket module. 316 L. Giancarli et al. / Fusion Engineering and Design 61/62 (2002) 307/318