Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4921398 | Fusion Engineering and Design | 2016 | 6 Pages |
Abstract
Neutronic performance and inventory analyses were conducted to quantify the damage and gas production rates in candidate materials when used in a fusion-fission hybrid system first wall (FW). The structural materials considered are austenitic SS, Cu-alloy and V- alloys. Plasma facing materials included Be, and CFC composite and W. It is shown that the highest damage rates and gas particles production in materials are experienced within the FW region of a hybrid similar to a pure fusion system. They are greatly influenced by a combined neutron energy spectrum formed by the two-component fusion-fission neutron source in front of the FW and in a subcritical fission blanket behind. These characteristics are non-linear functions of the fission neutron source intensity. Atomic displacement damage production rate in the FW materials of a subcritical system (at the safe subcriticality limit of â¼0.95 and the neutron multiplication factor of â¼20) is almost â¼2 times higher compared to the values distinctive for a pure fusion system at the same 14Â MeV neutron FW loading. Both hydrogen (H) and helium (He) gas production rates are practically on the same level except of about â¼4-5 times higher He-production in austenitic and reduced activation ferritic martensitic steels. A proper simulation of the damage environment in hybrid systems is required to evaluate the expected material performance and the structural component residence times.
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Authors
Vladimir Khripunov,