1. XS file
For the macro XS cases, user needs to write case related XS file. Comments are supported in the input file. All characters following an exclamation mark ! are commentary and are ignored by NECP-X. All strings in input card are case insensitive.
The XS file is like:
<ng>
mixture <id_mat> <order> !material
<tr_1> <nf_1> <kf_1> <chi_1> !group 1
<tr_2> <nf_2> <kf_2> <chi_2> !group 2
.
.
.
<tr_ng> <nf_ng> <kf_ng> <chi_ng> !group ng
<sc_1-1> <sc_2-1> ... <sc_ng-1> !to group 1
<sc_1-2> <sc_2-2> ... <sc_ng-2> !to group 2
.
.
.
<sc_1-ng> <sc_2-ng> ... <sc_ng-ng> !to group ng
[ mixture <id_mat> <order> !material
<tr_1> <nf_1> <kf_1> <chi_1> !group 1
<tr_2> <nf_2> <kf_2> <chi_2> !group 2
.
.
.
<tr_ng> <nf_ng> <kf_ng> <chi_ng> !group ng
<sc_1-1> <sc_2-1> ... <sc_ng-1> !to group 1
<sc_1-2> <sc_2-2> ... <sc_ng-2> !to group 2
.
.
.
<sc_1-ng> <sc_2-ng> ... <sc_ng-ng> !to group ng
]
ng
· integer value
· group number of XS
mixture keyword
Specifies the information of the mixture for the macro problems.
id_mat
· String value
· id of material
order
· Integer value
· Order of scattering matrix,
· Only support 0 for the macro problems
tr_1
· Real value
· transport corrected xs of group 1
nf_1
· Real value
· mu*fission of group 1
kf_1
· Real value
· kappa*fission of group 1
chi_1
· Real value
· fission sepctrum of group 1
sc_2-1
· Real value
· scattering xs from group 2 to group 1