Propagation of Cross-Section Uncertainties in Criticality Calculations in the Framework of UAM-Phase I Using MCNPX-2.7e and SCALE-6.1

Table 2

 𝑘_eff values for the different states of the 15×15 TMI fuel assembly obtained by MCNPX-2.7e and SCALE-6.1, taking the SCALE results as the reference for the difference in pcm.

	Unrodded		Rodded
	HZP	HFP	HZP	HFP
MCNPX-2.7.e	1.41768±16 pcm	1.40441±16 pcm	1.07386±22 pcm	1.06146±25 pcm
SCALE-6.1	1.41227	1.39802	1.07160	1.05834
Difference	383 pcm	457 pcm	211 pcm	295 pcm