Science and Technology of Nuclear Installations

Research Article

Presentation and Discussion of the UAM/Exercise I-1b: “Pin-Cell Burn-Up Benchmark” with the Hybrid Method

Table 6

Uncertainties in criticality value, _eff, with the main source of contributions. Cross-section uncertainties are taken from SCALE6.1/44-GROUP and fission yields and decay data source of uncertainty from JEFF-3.1.1.


0 GWd/MTU		10 GWd/MTU		30 GWd/MTU		60 GWd/MTU
Mean _eff 1.40	Rel. std. dev. (%)	Mean _eff 1.25	Rel. std. dev. (%)	Mean _eff 1.08	rel. std. dev. (%)	Mean _eff 0.90	Rel. std. dev. (%)

U²³⁸ (, )	0.28	U²³⁸ (, )	0.26	Pu²³⁹ (nubar)	0.39	Pu²³⁹ (nubar)	0.54
U²³⁵ (nubar)	0.26	Pu²³⁹ (nubar)	0.20	U²³⁸ (, )	0.26	U²³⁸ (, )	0.26
U²³⁵ (, )	0.21	U²³⁵ (nubar)	0.20	U²³⁸ (, )	0.19	U²³⁸ (, )	0.25
U²³⁸ (, )	0.12	U²³⁵ (, )	0.15	Pu²³⁹ (fis)	0.13	Pu²³⁹ (fis)	0.21
U²³⁵ (, -fiss)	0.10	U²³⁸ (, )	0.15	U²³⁵ (nubar)	0.13	Pu²³⁹ (, -fiss)	0.18
⋯	⋯	⋯	⋯	⋯	⋯	⋯	⋯

Total var()	0.49		0.51		0.63		0.79

var()_XS/SCALE	0.00		0.19		0.25		0.35
var()_FYs	0.00		0.22		0.22		0.21
var()_Decay	0.00		0.00		0.00		0.00

Total var()	0.49		0.58		0.71		0.89