Neutronics Analysis of Graphite-moderated Solid Breeder Blanket Designs for Intor

An In-depth analysis of the INT05 tritium-production—blanket design Is presented. A ternary system of solid silicate breeder, lead neutron multiplier, and graphite moderator is explored primarily from safety and blanket tritium-inventory considerations. Lithiumsilicate (Li2Si03) bleeder systems are studied along 2 with water (H2P/D2O) and Type 316 stainless steel as coolant and structural material, respectively. The rnalysis examines the neutronics effects on tritiumproduction regarding: (1) coolant choice; (2) moderator choice; (3) moderator location; (4) multiplier thickness; (5) L1 enrichment; and (6) Li burnup. The tritiura-breedlng-blanket modules are located at the top, outboard, and bottom (outeri parts of the torus, resulting in a breeding coverage of -60% at the first-wall surface. It is found that the reference INTOR design yielis, based on a three-dimensional analysis, a net tritium breeding ratio (BR) of -0.65 at the beginning of reactor operation, satisfying the design criterion of BR > 0.6.