A stochastic method to propagate uncertainties along large cores deterministic calculations

Special Issue on 4th International Workshop on Nuclear Data Covariances, October 2–6, 2017, Aix en Provence, France – CW2017

Open Access

Table 3

Main contributors and total propagated uncertainty (1σ) with COMAC-V2.

Contributor rank	unc. k_eff	pcm	unc. P_center	std	unc. P_{periph. ass.}	std
1	²³⁸U (n,f)	277	¹H (n,n)	1.3%	¹H (n,n)	1.1%
2	²³⁸U (n,γ)	248	²³⁵U χ	1.0%	²³⁵U χ	1.0%
3	²³⁵U (n,γ)	145	²³⁸U (n,n')	1.0%	²³⁸U (n,n')	0.8%
4	²³⁵U (n,f)	144	⁵⁶Fe (n,n)	0.8%	⁵⁶Fe (n,n)	0.8%
5	¹H (n,γ)	132	²³⁵U (n,γ)	0.3%	²³⁵U (n,γ)	0.2%
6	²³⁸U (n,f)	116	¹H (n,γ)	0.3%	¹H (n,γ)	0.2%
7	²³⁵U χ	103	²³⁸U (n,γ)	0.3%	²³⁸U (n,γ)	0.2%
Total uncertainty	k_eff	634		3.1%		2.3%

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