A conceptual design of a DEMO fusión reactor is being deveioped under the Spanlsh Breeding Blanket Teclmology Progmmme: TECNO_FUS based on a He/LiPb dual coolant blanket as reference design option. The following issues have been analyzed to address the demonstration of the neutronic reliability of this conceptual blanket design; power amplificationcapacity of the blanket, tritium breeding capabílity for fuel self-sufficiency, power deposition due to nuclear heating in superconducting coils and material damage (dpa, gas production) to estímate the operational Ufe of the steel-made structural components in the blanket and vacuumvessel(W). In order tooptimize the shieldingof the coils different combinations of water and steel have been considered for the gapof the VV. The used neutrón source is based on an axisymmetric 2D fusión reaction profile for the given plasma equilibrium con figura don. MCNPX has been used for transpon calculations and ACAB has been used to handle gas production and damage energy cross sections.

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