4. Depletion Results File Format¶

The current version of the depletion results file format is 1.0.

/

Attributes: filetype (char[]) – String indicating the type of file. version (int[2]) – Major and minor version of the statepoint file format. eigenvalues (double[][][2]) – k-eigenvalues at each time/stage. This array has shape (number of timesteps, number of stages, value). The last axis contains the eigenvalue and the associated uncertainty number (double[][][][]) – Total number of atoms. This array has shape (number of timesteps, number of stages, number of materials, number of nuclides). reaction rates (double[][][][][]) – Reaction rates used to build depletion matrices. This array has shape (number of timesteps, number of stages, number of materials, number of nuclides, number of reactions). time (double[][2]) – Time in [s] at beginning/end of each step. depletion time (double[]) – Average process time in [s] spent depleting a material across all burnable materials and, if applicable, MPI processes.

/materials/<id>/

Attributes: index (int) – Index used in results for this material volume (double) – Volume of this material in [cm^3]

/nuclides/<name>/

Attributes: atom number index (int) – Index in array of total atoms for this nuclide reaction rate index (int) – Index in array of reaction rates for this nuclide

/reactions/<name>/

Attributes: index (int) – Index user in results for this reaction

Note

The reaction rates for some isotopes not originally present may be non-zero, but should be negligible compared to other atoms. This can be controlled by changing the openmc.deplete.Operator dilute_initial attribute.