New Strategies in the Code of Uncertainty and Sensitivity Analysis (CUSA) and Its Application in the Nuclear Reactor Calculation

Table 2

The top 3 sources of uncertainty in²³⁵U effective resonance absorption XS.

Energy group	Contributions to the relative uncertainty (%)
	^235U (n, γ)	^235U (n, f)	^238U elastic
15	9.362E + 00 ± 6.683E − 01	3.441E − 01 ± 2.435E − 02	0.000E + 00
16	8.418E + 00 ± 5.999E − 01	3.572E − 01 ± 2.528E − 02	0.000E + 00
17	4.955E + 00 ± 3.515E − 01	6.125E − 01 ± 4.334E − 02	0.000E + 00
18	4.109E + 00 ± 2.913E − 01	9.056E − 01 ± 6.409E − 02	2.053E − 04 ± 1.453E − 05
19	3.991E + 00 ± 2.829E − 01	9.201E − 01 ± 6.512E − 02	3.189E − 04 ± 2.257E − 05
20	1.484E + 00 ± 1.050E − 01	4.932E − 01 ± 3.490E − 02	8.482E − 04 ± 6.002E − 05
21	3.146E − 01 ± 2.226E − 02	2.101E − 01 ± 1.487E − 02	3.984E − 03 ± 2.819E − 04
22	2.441E − 01 ± 1.727E − 02	1.790E − 01 ± 1.266E − 02	6.583E − 03 ± 4.658E − 04
23	1.636E − 01 ± 1.158E − 02	1.974E − 01 ± 1.397E − 02	3.189E − 02 ± 2.256E − 03
24	1.941E − 01 ± 1.374E − 02	1.675E − 01 ± 1.186E − 02	6.732E − 02 ± 4.764E − 03
25	1.879E − 01 ± 1.330E − 02	1.835E − 01 ± 1.299E − 02	1.222E − 01 ± 8.644E − 03
26	2.425E − 01 ± 1.716E − 02	1.496E − 01 ± 1.059E − 02	1.181E − 01 ± 8.354E − 03
27	2.745E − 01 ± 1.942E − 02	2.664E − 01 ± 1.885E − 02	1.762E − 02 ± 1.247E − 03