Science and Technology of Nuclear Installations / 2013 / Article / Tab 4 / 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 4 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 rodded case.
(a) HZP Reaction Reaction MCNP-2.7e SCALE-6.1 Ratio
U
U
0.21670 0.23086 0.939
U
U
0.17403 0.17602 0.989
U
U
0.16286 0.16089 1.012
U
U
0.11027 0.11189 0.985
U
U
0.10708 0.10936 0.979
Ag
Ag
0.07569 0.07831 0.967
Ag
Ag
0.06786 0.06965 0.974
In
In
0.03640 0.03627 1.003
U
U
0.02242 0.02237 1.002
(n , n )
(n , γ ) 0.01812 0.01185 1.529
(n,n )
(n,n ) 0.01357 0.02340 0.580
Gd
Gd
0.00747 0.00817 0.915
Cd
Cd
0.00744 0.00738 1.008
Gd
Gd
0.00556 0.00584 0.952
(n , n )
(n , n ) 0.00347 0.00042 8.193
U
U
0.00322 0.00337 0.955
(n , n )
(n , n ) 0.00310 0.00164 1.888
Gd
Gd
0.00162 0.00154 1.050
(n , n )
(n , n ) 0.00145 0.00031 4.695
(n , n )
(n , f ) −0.00139 0.00088 −1.579
(n , n )
(n , n
) −0.03164 −0.00757 4.178 Total 0.37315 0.38518 0.969
U
U
— 0.25594
U
U
— 0.13360 Total SCALE 0.49199 0.783
(b) HFP Reaction Reaction MCNP-2.7e SCALE-6.1 Ratio
U
U
0.22281 0.23783 0.937
U
U
0.17426 0.17639 0.988
U
U
0.16419 0.16909 0.971
U
U
0.10985 0.11143 0.986
U
U
0.10703 0.10925 0.980
Ag
Ag
0.07689 0.07969 0.965
Ag
Ag
0.06925 0.07100 0.975
In
In
0.03707 0.03690 1.005
U
U
0.02313 0.02310 1.001
(n , n )
(n , γ ) 0.02141 0.01592 1.345
(n , n )
(n , n
) 0.01567 −0.00854 −1.835
(n , n )
(n , n ) 0.01276 0.02589 0.493
Gd
Gd
0.00770 0.00825 0.934
Cd
Cd
0.00762 0.00748 1.019
(n , n )
(n , n ) 0.00587 0.00043 13.758
Gd
Gd
0.00569 0.00592 0.961
(n , n )
(n , n ) 0.00450 0.00031 14.391
U
U
0.00341 0.00356 0.958
(n , n )
(n , n ) 0.00262 0.00167 1.569
Gd
Gd
0.00166 0.00159 1.048
(n , n )
(n , f ) −0.00151 0.00094 −1.599 Total 0.37973 0.39380 0.964
U
U
— 0.25451
U
U
— 0.13788 Total SCALE 0.49966 0.788
