Perturbation-Theory-Based Sensitivity and Uncertainty Analysis with CASMO-4

Table 6

The five most significant sources of uncertainty for the response 𝜈Σ_f,1 and the corresponding energy- and region-integrated relative sensitivity coefficients. The sensitivity coefficients with respect to the parameter 𝜒 have been constrained.

Nuclide	Param. pair	Sensitivity		Contribution to Δ𝑅/𝑅 (%)
		CASMO	TSUNAMI	CASMO	TSUNAMI
^235U	𝜒,𝜒	4.657×10^−9	−2.757×10^−10	5.934×10^−1	6.150×10^−1
^238U	𝜈,𝜈	3.975×10^−1	3.879×10^−1	4.623×10^−1	4.544×10^−1
^238U	𝜎f,𝜎f	3.931×10^−1	3.834×10^−1	2.084×10^−1	1.994×10^−1
^238U	𝜎s,𝜎s	−2.743×10^−2	−2.718×10^−2	2.015×10^−1	5.148×10^−1
^235U	𝜎f,𝜎f	5.826×10^−1	5.866×10^−1	1.588×10^−1	1.466×10^−1