A model for pulsed activation accounting for circulation, extraction, and makeup

A model has been developed to accurately calculate the nuclide inventories of the target constituents of Inertial Fusion Energy (IFE) reactors such as HYLIFE-II. It can explicitly account for (1) the combined effects of activ ation during target implosion (by a high-amplitude flux) and while passing through the reactor chamber (by a low-amplitude flux); (2) decay during cir culation in the primary coolant loop, after extraction from the coolant loo p, and before re-insertion into the reactor chamber as a new target; (3) co ntinuous extraction and feed-in of target material; and (4) replacement of part of the activation products by makeup materials. The solution strategy uses transition factors - the ratio of the amount of created nuclides to th e initial amount - for each system component.