%XSEC Card
This card is used to describe the cross section data. This card is conditional : either %XSEC or XTAB card must be present
%XSEC |
Variable | Description | Remarks |
|---|---|---|---|
| LINE 1 | NG | Number of groups | |
| NMAT | Number materials | ||
| LINE 2 | SIGTR(g) | Transport macroscopic XS for group g | Repeat LINE 2 NG times. And again repeat this input segment NMAT times.(See example below) |
| SIGA(g) | Absorption macroscopic XS for group g | ||
| NUF(g) | Nu * Fission macroscopic XS for group g | ||
| SIGF(g) | Fission macroscopic XS for group g | ||
| CHI(g) | Fission neutron spectrum for group g | ||
| SIGS(g,1:NG) | Scattering macroscopic XS from group g to other groups |
Example:
%XSEC
2 5 ! Number of groups and number of materials
! sigtr siga nu*sigf sigf chi sigs_g1 sigs_g2
0.222222 0.010 0.000 0.000 1.0 0.1922 0.020
0.833333 0.080 0.135 0.135 0.0 0.000 0.7533 ! MAT1 : Outer Fuel
0.222222 0.010 0.000 0.000 1.0 0.1922 0.020
0.833333 0.085 0.135 0.135 0.0 0.000 0.7483 ! MAT2 : Inner Fuel
0.222222 0.0100 0.000 0.000 1.0 0.1922 0.020
0.833333 0.1300 0.135 0.135 0.0 0.000 0.7033 ! MAT3 : Inner Fuel + Control Rod
0.166667 0.000 0.000 0.000 0.0 0.1267 0.040
1.111111 0.010 0.000 0.000 0.0 0.000 1.1011 ! MAT4 : Reflector
0.166667 0.000 0.000 0.000 0.0 0.000 0.040
1.111111 0.055 0.000 0.000 0.0 0.000 0.000 ! MAT5 : Reflector + Control Rod