## 4 Conclusions  
Starting from the EU DEMO1 2017 reference configuration MCNP model (representing a \(11.25^{\circ}\) toroidal sector of the tokamak), two MCNP models have been reproduced: with WCLL and HCPB Single Module Segment layered blankets, both with the MCNP model of the divertor 2019 configuration. The detailed MCNP representations of the whole ITER-like PFCs inboard and outboard targets have been developed and integrated in both the above-mentioned models. A detailed comparative neutronics analysis, regarding the nuclear load's spatial distributions on the Divertor PFCs targets has been performed, leading to the following main remarks:  
* The spatial distributions of the main nuclear loads (radiation damage (dpa/FPY), nuclear heating density (W/cm\({}^{3}\)) and Helium production (appm/FPY)) on the PFC elements (W-monoblock, Cu/CuCrZr and PFC-CB supports made of Eurofer) of the inner and outer targets, have been assessed, for both the blanket configurations under analysis. The maximum and minimum values and the related positions where they are achieved, are summarized in Tables 6-9. * All the graphs and maps clearly show a higher level of nuclear load magnitude on the components placed more externally on the targets (inboard and outboard), compared to the central ones. Therefore, a symmetrical behavior with respect to the central part of the target is confirmed. Very similar values are observed on both external target edges (red and purple, in Figure 7). The differences between internal and external edges are more pronounced on the straight leg (e.g., about +50/60% as peak difference), and more attenuated on the baffle region (e.g., around +5/10%). This effect on the toroidal distribution of the loads on the targets is due to the fact that the external sides of the targets (especially on the baffle region) are subjected to higher irradiation levels probably due to the radiation streaming in the gaps between the cassettes. * The different type of blanket has an impact on the neutron spectrum (water vs. helium as coolant) impinging on the targets (Figure 54). Therefore, it is reasonable to expect an effect on the nuclear load's distribution during operations. * Helium production on W, Cu/CuCrZr appears to be not significantly affected by the blanket configuration. He-production in Eurofer seems to be more dependent on the different shape of the neutron spectra, highlighting slightly higher levels with WCLL than HCPB. * Nuclear damage on W, Cu/CuCrZr and Eurofer show higher levels with the WCLL blanket than HCPB. The average differences amount to about +15%/10% on W, +20% on Cu/CuCrZr, +15% on Eurofer (baffle region) and around +20% on W, +20/30% on Cu/CuCrZr and +20% on Eurofer (straight leg). * Nuclear heating density shows a trend similar to nuclear damage. This is due to the greater gamma generation, whose production on the divertor targets is favored by the water-cooled blanket (higher neutron fluxes at lower energy). These differences are more reduced in the baffle region (+10% on W, Cu/CuCrZr and Eurofer) compared to the straight leg zone (+20% on W, +15/20% on Cu/CuCrZr, and Eurofer). * Analyzing cross-section data for radiation damage in Iron, Copper and Tungsten available in literature, it seems that there is a range where cross-sections increase while neutron energies decrease (like (n,\(\gamma\)) reactions), thus contributing to a similar outcome of nuclear heating distribution. He-production cross sections for most of the isotopes of Iron, Tungsten and Copper, are threshold reactions (they occur for neutron energies greater than around 1 MeV). If the neutron spectra comparison (Figure 54) is observed, it is evident that they have a quite similar trend in the energy range above 1 MeV, thus leading to an enough similar response in terms of He-production both for WCLL and HCPB, except for Eurofer, as previously stated, probably due to the presence of other elements. * Table 10 shows the total nuclear power (MW) deposited on the PFCs and CB and the breakdown in each component during operations.