Nuclear analysis of DEMO water-cooled blanket based on sub-critical water condition

For the water-cooled solid blanket of DEMO, the nuclear analysis was performed based on present cooling piping system. Especially, distributions of neutron load and temperature were calculated with P-n is 5 MW/m(2). Furthermore, the local TBR was optimized by changing the material proportion for each P-n level (1-5 MW/m(2)). It was confirmed that the size of cooling loop for sub-critical water could be used as about 2000 x 450 mm and the cooling pipe diameter of D is 12 mm, d is 9 mm at v is 5.36 m/s. The pipe pitches would vary with P-n level which is related to the blanket structure design. Nuclear heat distribution is the base to decide the distribution of cooling pipe positions. It was found that the local TBR of blanket would be dropped down along with the P-n level rising which was mainly depended on the thickness of beryllium variation. Finally, the layout of cooling pipes for each level was obtained. Crown Copyright (C) 2011 Published by Elsevier B.V. All rights reserved.