Discussion forum for Serpent users

the dt 3 option is used to divide the detector result with the result of another detector, so you don't need this option to divide by volume.

The warning about the mvol card suggest that there is something wrong with how the material volumes are defined.

The fact that you get the first warning only after 3 weight-window iterations suggests that the particles do not reach that region of geometry that causes it until then.

Did you have the "burn 1" option in your material definition when reading the data from the binary file? The error message ("No materials corresponding to restart file") suggests that Serpent cannot find even the material name, which may be because the renames the materials when the burnup option is...

This capability is in the development version and will be included in the next update.

It maybe that this feature was not extended to neutrons in version 2.1.28. Try using the latest version (2.1.31).

Calculating analytical solutions for material volumes in a general 3D geometry is practically impossible. The fuel pin universes are truncated by the lattice cells, and even though it is possible to determine which material is located at position (x,y,z), it is not as straightforward to figure out w...

The iteration is applied separately for each step, so yes, each burnup step is calculated using critical boron concentration.

The first warning is probably related to some error in the interaction data. Do you get this frequently, or is this more like random rare event? The warnings on material volumes are related to the use of depletion zone division. The -checkvolumes option produces a file where you can see the indexing...

The iteration is applied for all steps separately. So your reactor will remain critical throughout the cycle.

Could you post the geometry and detector definitions here?

Also, another option is to use the ADF functionality to get the partial currents.