Editing Automated depletion zone division (section)

=== Sub-division by Cartesian or cylindrical mesh ===

Accounting for the depletion of burnable absorber requires radial sub-division, which for pin-type material regions can be done automatically. If it is assumed that the absorber is mixed in fuel types 9-13, sub-division into 10 rings can be done using the '''subr''' entry: 

 <nowiki>
div fuel9  sep 1 subr 10 0.0 4.38E-01
div fuel10 sep 1 subr 10 0.0 4.38E-01
div fuel11 sep 1 subr 10 0.0 4.38E-01
div fuel12 sep 1 subr 10 0.0 4.38E-01
div fuel13 sep 1 subr 10 0.0 4.38E-01</nowiki>

The division is made between 0 and 0.438 cm into 10 rings with equal cross-sectional area:

[[File:div3.png]]

If necessary, the fuel pins can be further sub-divided into angular sectors using the '''subs''' entry, for example:

 <nowiki>
div fuel1 sep 1 subs 4 45.0
div fuel2 sep 1 subs 4 45.0
...
div fuel13 sep 1 subr 10 0.0 4.38E-01 subs 4 45.0</nowiki>

The pins are divided into 4 sectors and tilted by 45 degrees:

[[File:div4.png]]

The axial division works in a similar manner using the '''subz''' entry, taking the number of axial zones and minimum and maximum coordinate as the input values. Radial, angular and axial sub-division are limited to pin-type material regions, but the cell-based division applies to any type of geometry.

The sub-division can also be done using a Cartesian mesh, by providing the mesh size in x-, y- and z-directions.