## 3 Nuclear Analyses
### Summary of the Nuclear Load's Spatial Distributions Analyses
Regarding the comparison between the poloidal profiles of external and internal arrays (both for WCLL and HCPB) of the inner target (Figure 48), once again, the plots show a more intense level of nuclear loads magnitude on the components placed more externally on the targets, compared to the central ones. The deviations between internal and external edges are more pronounced on the straight leg (e.g., about +40/70%), and more attenuated on the baffle region (e.g., around +15/30%). If the poloidal profiles related to the outer target (Figure 49) are considered, the following assessment can be done: the difference between the profiles is about +0/5% in correspondence of the baffle region (+2.4% comparing the peak values shown in Tables 7 and 9), remaining substantially unchanged (+5/10%) also in the remaining part of the target (+8.8% comparing the peak values shown in Tables 7 and 9). Regarding the comparison between the poloidal profiles of external and internal arrays (both for WCLL and HCPB) of the outer target (Figure 49), once again, the plots highlight a greater intensity of nuclear loads level on the components placed more externally on the targets, compared to the central ones. The variances between internal and external sides are significantly higher on the straight leg (e.g., about +30/90%), and more attenuated on the baffle region (e.g., +10/30%). The reason why this effect occurs is better discussed in the next section. The poloidal profiles for the nuclear quantities of interest, on the first layer (Eurofer) of the inboard cassette body (CB) have been assessed, subdividing it into 56 spheres (or segment) both on the external and the innermost side (Figure 50). The purpose of this additional evaluation is the analysis of the shielding capabilities of the PFCs on the most outward part of the cassette body, as well as the nuclear loads distribution along the poloidal profiles of the CB, considering once again the impact of  
Figure 30:9 Outer poloidal profiles of the He-production (appm/FPY) on PFC-CB supports made of Eurofer, comparing the values on the external and innermost target sides, both for WCLL and HCPB blanket case. Figure 29:0 External and innermost CB layers on the inner target, subdivided into 56 spheres for the nuclear loads assessment. the different kind of blanket (WCLL and HCPB). Considering the nuclear heating profiles (Figure 51), once again it is greater with the Water Cooled blanket than the Helium cooled one and in particular, the maximum values are in correspondence of the external edge baffle region: 8.47 W/cm\({}^{3}\) and 7.41 W/cm\({}^{3}\) for WCLL and HCPB, respectively, showing an increase of about 14.3% with WCLL. The minimum values are 2.37 W/cm\({}^{3}\) (WCLL) and 1.90 W/cm\({}^{3}\) (HCPB), highlighting an increase of 24.7% with the water coolant, in correspondence with the lower and innermost part of the cassette body. Therefore, the WCLL shows higher nuclear heating loads than HCPB (+15/20% on the baffle region, +20/30% on the straight leg). As already noted, a greater intensity on the external edges than the innermost side (around +15% on the baffle region, +25/30% on the straight leg) is pointed out both for WCLL and HCPB cases. The nuclear damage profiles are shown in Figure 52, highlighting greater values with the WCLL blanket than the HCPB. The peak values are in correspondence of the external edge baffle region: 4.49 dpa/FPY and 3.95 dpa/FPY for WCLL and HCPB, respectively, showing an increase of about 13.4% with WCLL. Considering that the cumulated damage limit in Eurofer (as mentioned in the previous sections) is 6 dpa, this implies that under these conditions the DEMO divertor cassette body could fulfill the expected lifetime of 1.5 FPY only with the HCPB blanket, on the contrary with the WCLL the lifetime expected may be lower (1.34 FPY). The minimum values are 0.61 dpa/FPY (WCLL) and 0.52 dpa/FPY (HCPB), showing an increase of 17.3% with the water coolant, in correspondence with the lower and innermost part of the cassette body.