Science and Technology of Nuclear Installations / 2013 / Article / Tab 3 / Research Article
Propagation of Cross-Section Uncertainties in Criticality Calculations in the Framework of UAM-Phase I Using MCNPX-2.7e and SCALE-6.1 Table 3 Comparison of the uncertainty contribution to
of each variance-covariance matrix of the reaction pair presented in the first two columns given in rel.std.dev.(%) calculated by SCALE-6.1 and MCNPX-2.7e for unrodded case.
(a) HZP Reaction Reaction MCNP-2.7e SCALE-6.1 Ratio
U
U
0.23145 0.24582 0.942
U
U
0.19674 0.19970 0.985
U
U
0.10733 0.10895 0.985
U
U
0.09078 0.09455 0.960
U
U
0.08368 0.08500 0.985
U
U
0.01363 0.01366 0.998
(n , n )
(n ,
) 0.01215 −0.00474 −2.566
(n , n )
(n , n ) 0.01185 0.02265 0.523
Gd
Gd
0.00645 0.00683 0.945
Gd
Gd
0.00476 0.00488 0.977
U
U
0.00246 0.00257 0.957
Gd
Gd
0.00129 0.00128 1.006
(n , n )
(n , f ) −0.00116 0.00065 −1.787
U
U
−0.00476 −0.00504 0.944 Total 0.34577 0.35940 0.962
U
U
— 0.26937
U
U
— 0.08531 Total SCALE 0.46441 0.774
(b) HFP Reaction Reaction MCNP-2.7e SCALE-6.1 Ratio
U
U
0.23793 0.25293 0.941
U
U
0.19738 0.20025 0.986
U
U
0.10697 0.10860 0.985
U
U
0.09808 0.09962 0.985
U
U
0.08333 0.08470 0.984
(n , n )
(n ,
n
) 0.02302 −0.00562 −4.093
U
U
0.01634 0.00943 1.732
U
U
0.01407 0.01412 0.997
(n , n )
(n , n ) 0.01358 0.02520 0.539
Gd
Gd
0.00653 0.00693 0.943
Gd
Gd
0.00480 0.00496 0.967
U
U
0.00259 0.00272 0.953
Gd
Gd
0.00135 0.00132 1.023
(n , n )
(n , f ) −0.00137 0.00070 −1.959 Total 0.35331 0.36607 0.965
U
U
— 0.26834
U
U
— 0.08823 Total SCALE 0.46984 0.779
