AbstractThe systems of integral equations are developed to evaluate tritium generation in boronized shields and lithium burn-up in blankets of thermonuclear reactors. These systems of integral equations are solved analytically with reasonable simplifications. By so doing, relatively simple methods to evaluate both the tritium generation in a boronized shield and the lithium depletion in blankets are developed and proposed for future work under thermonuclear reactor projects. The method obtaining 3T production in boronized shielding materials is checked for various blanket designs of ITER CDA, namely ceramic breeder concepts and a PbLi breeder concept. The amount of tritium generated in the inboard boronized shielding blanket of ITER/OTR and lithium depletion in the outboard Li2O-bearing blanket of ITER/FER are evaluated by the proposed methods to demonstrate practical usefulness of these evaluation procedures.