General Rules

Some general rules for KOMODO inputs:

1. Input deck is in free-format form with maximum 200 columns
2. Comments are marked by !. Example:

   ! COMPOSITION 1
   0.20574  0.00654  0.00415  0.00415  1.0  0.0  0.01462  !Group 1
   0.68866  0.04850  0.06099  0.06099  0.0  0.0  0.00000  !Group 2
   

3. KOMODO input is modular, where it is split into several cards. Cards’ keywords shall be uppercase and marked by %. Example:

   %MODE    ! Calculation mode card
   FORWARD
   %XSEC    ! Cross section card                                                                                                                                  
   2 4      ! Number of groups and number of materials
   ...
   ...
   %GEOM    ! Geometry card
   12 12 2  !nx, ny, nz
   ...
   ...
   

4. Numbers can be repeated using * mark. For example

   10.0 8*20.0  !This line is equivalent to  10.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0
   

5. If you have identical cards for several inputs, it is a good idea to place those cards in separated card files. In the main inputs, you just need to put location of the card files. For example, all cases in NEACRP benchmark have identical cross section data; hence we may place %XSEC card in a separated named neacrp_xsec which has the following content

   ! XSEC CARD FILE
   2  11    ! Number of groups and number of materials
   !  sigtr        siga        nu*sigf     kappa*sigf  chi sigs_g1 sigs_g2
   5.32058E-02  3.73279E-04  0.00000E+00  0.00000E+00  1.0  0.0  2.64554E-02
   3.86406E-01  1.77215E-02  0.00000E+00  0.00000E+00  0.0  0.0  0.00000E+00  !COMP 1
   ...
   ...
   2.21878E-01  9.71937E-03  6.11444E-03  7.60778E-14  1.0  0.0  1.66175E-02
   7.64704E-01  8.85488E-02  1.12635E-01  1.47876E-12  0.0  0.0  0.00000E+00  !COMP 11
   

In the main input, we may refer to the neacrp_xsec file by telling KOMODO the location of neacrp_xsec preceded by FILE keyword

! XSEC CARD
%XSEC
FILE /home/imronuke/KOMODO/smpl/static/NEACRP/neacrp_xsec

Card Description

KOMODO has several input cards. Card is a keyword marked with %. Each card can be placed arbitrarily in the input deck. Two cards are mandatory for any problems, while the rest are optional and conditional depend on the nature problem being solved. The description of input for each card is explained in this subsection. Following table lists all cards used in KOMODO. You can click each card to get their description

No.	Cards	Description	Remark
1.	%MODE	Calculation mode	Mandatory
2.	%GEOM	Geometry of the problem	Mandatory
3.	%XSEC	Cross Sections	Conditional
4.	%CASE	Problem case	Optional
5.	%ESRC	Extra source	Conditional
6.	%ITER	Iteration Control	Optional
7.	%PRNT	Output print control	Optional
8.	%ADF	Assembly Discontinuity Factor	Optional
9.	%CROD	Control rods	Conditional
10.	%EJCT	Control rods ejection and/or insertion	Conditional
11.	%FTEM	Fuel temperature input card	Conditional
12.	%MTEM	Moderator/Coolant temperature input card	Conditional
13.	%CDEN	Coolant density input card	Conditional
14.	%BCON	Boron concentration input card	Conditional
15.	%CBCS	Critical boron concentration input card	Conditional
16.	%THER	TH input card	Conditional
17.	%XTAB	XSEC library for branch calculations	Conditional
18.	%KERN	Nodal kernel options	Optional
19.	%EXTR	Exponential flux transformation option card for transient problem	Optional
20.	%THET	Used to set theta value for transient problem	Optional
21.	%OUTP	Used to produce detailed 3D power	Optional
22.	%VTK	Used to generate a vtk file for visualization	Optional