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

Table 4

The contributions of microscopic cross sections to the k_eff uncertainty.

Cross section type	Total sensitivity coefficient	Uncertainty (%) (sandwich rule)	Uncertainty (%); Statistics sampling
^238U (n, γ)	−1.948E − 01	2.692E − 01	2.692E − 01 ± 1.905E − 02
^235U (n, γ)	−6.472E − 02	1.007E − 01	1.012E − 01 ± 7.161E − 03
Zr-nat (n, γ)	−5.147E − 03	5.988E − 02	6.036E − 02 ± 4.271E − 03
^235U (n, f)	6.838E − 02	2.026E − 02	2.032E − 02 ± 1.438E − 03
^1H elastic	1.707E − 01	1.979E − 02	2.045E − 02 ± 1.447E − 03
^238U-elastic	4.089E − 03	9.781E − 03	9.709E − 03 ± 6.870E − 04
^16O-elastic	−9.390E − 03	9.327E − 03	9.225E − 03 ± 6.549E − 06
^235U elastic	−2.915E − 04	1.380E − 03	1.384E − 03 ± 9.793E − 05
Zr-nat-elastic	−2.107E − 03	1.305E − 03	1.320E − 03 ± 9.341E − 05
^16O (n, γ)	−1.013E − 06	9.880E − 06	9.725E − 06 ± 6.881E − 07
^1H (n, γ)	−1.636E − 03	8.159E − 04	8.262E − 04 ± 5.846E − 05
Sum	—	2.953E − 01	2.956E − 01 ± 2.091E − 02