5. Depletion Results File Format

The current version of the depletion results file format is 1.1.

/

Attributes
  • filetype (char[]) – String indicating the type of file.

  • version (int[2]) – Major and minor version of the statepoint file format.

Datasets
  • 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.

  • source_rate (double[][]) – Power in [W] or source rate in [neutron/sec]. This array has shape (number of timesteps, number of stages).

  • 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.