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E. 15 energy groups selected between 20 MeV and E(thermal) to represent: • thresholds of fertile isotope fission cross-sections, and of many inelastic cross-sections, up to 20 MeV • the continuum down to the upper unresolved resonance energy limit, • the unresolved resonance energy region, • the resolved resonance region, • the thermal range. Uncertainty values within these large energy regions are nearly fully correlated 4. Base data sensitivity and integral uncertainty The ERANOS "formulaire" was developed for reliable, precise and efficient calculations of sodium-cooled fast neutron reactor cores.

Capture Cross Section for Pu240 in the Resonance Region 25 The CAPRA PuN Core ( U free core) [4,5] has been studied as it is a core rather sensitive to Pu240. 2 evaluations. Values are presented in the following tables 4 and 5. Table 4. 78 Table 5. 38 Large differencies can be observed for the critical mass. Similar trends can be seen on both comparisons but they are coming from different energy regions (region from group 13 to 26 being the resonance region). Only part of this problem comes from the resonance region but the new evaluation being used is incomplete.

1. Na cross sections Na cross section measurements performed at Geel demonstrate a significant change on the inelastic cross section. Furthermore, the resonance structure coherent with the total cross section measured at ORNL Na Inelastic Cross-section Figure 1. 2. 2 evaluations with a much better detailed description of the complete resonance structure as it can be seen in the following figure 2. 49E-03 Enerav fMsVl Figure 2. Capture Cross Section for Pu240 in the Resonance Region 25 The CAPRA PuN Core ( U free core) [4,5] has been studied as it is a core rather sensitive to Pu240.

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A 17/10-approximation algorithm for k -bounded space on-line variable-sized bin packing by Zhang G.


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