Abstract
The accurate modelling of the activation of flowing material in a fusion reactor, such as coolant water or lithium-lead breeder, has important safety and shielding implications. Two codes developed at CCFE which account for neutron flux variation have been investigated for the effects of incorporating computational fluid dynamics (CFD) and benchmarked against experimental data. With the inclusion of CFD, both codes are found to be reasonably accurate and benchmarking discrepancies identified previously for 16N water activation data have been clarified. Precise paths calculated using CFD have been used in flowing lithium-lead activation analysis for the first time, with results suggesting that simplified linear paths may give comparable results to detailed CFD paths, but low-detail CFD paths should be avoided. This work paves the way for an accurate and benchmarked set of fluid activation codes.
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