.. _io_statepoint: ======================= State Point File Format ======================= The current version of the statepoint file format is 17.0. **/** :Attributes: - **filetype** (*char[]*) -- String indicating the type of file. - **version** (*int[2]*) -- Major and minor version of the statepoint file format. - **openmc_version** (*int[3]*) -- Major, minor, and release version number for OpenMC. - **git_sha1** (*char[40]*) -- Git commit SHA-1 hash. - **date_and_time** (*char[]*) -- Date and time the summary was written. - **path** (*char[]*) -- Path to directory containing input files. - **cmfd_on** (*int*) -- Flag indicating whether CMFD is on (1) or off (0). - **tallies_present** (*int*) -- Flag indicating whether tallies are present (1) or not (0). - **source_present** (*int*) -- Flag indicating whether the source bank is present (1) or not (0). :Datasets: - **seed** (*int8_t*) -- Pseudo-random number generator seed. - **energy_mode** (*char[]*) -- Energy mode of the run, either 'continuous-energy' or 'multi-group'. - **run_mode** (*char[]*) -- Run mode used, either 'eigenvalue' or 'fixed source'. - **n_particles** (*int8_t*) -- Number of particles used per generation. - **n_batches** (*int*) -- Number of batches to simulate. - **current_batch** (*int*) -- The number of batches already simulated. - **n_inactive** (*int*) -- Number of inactive batches. Only present when `run_mode` is 'eigenvalue'. - **generations_per_batch** (*int*) -- Number of generations per batch. Only present when `run_mode` is 'eigenvalue'. - **k_generation** (*double[]*) -- k-effective for each generation simulated. - **entropy** (*double[]*) -- Shannon entropy for each generation simulated. - **k_col_abs** (*double*) -- Sum of product of collision/absorption estimates of k-effective. - **k_col_tra** (*double*) -- Sum of product of collision/track-length estimates of k-effective. - **k_abs_tra** (*double*) -- Sum of product of absorption/track-length estimates of k-effective. - **k_combined** (*double[2]*) -- Mean and standard deviation of a combined estimate of k-effective. - **n_realizations** (*int*) -- Number of realizations for global tallies. - **global_tallies** (*double[][2]*) -- Accumulated sum and sum-of-squares for each global tally. - **source_bank** (Compound type) -- Source bank information for each particle. The compound type has fields ``wgt``, ``xyz``, ``uvw``, ``E``, ``g``, and ``delayed_group``, which represent the weight, position, direction, energy, energy group, and delayed_group of the source particle, respectively. Only present when `run_mode` is 'eigenvalue'. **/cmfd/** :Datasets: - **indices** (*int[4]*) -- Indices for cmfd mesh (i,j,k,g) - **k_cmfd** (*double[]*) -- CMFD eigenvalues - **cmfd_src** (*double[][][][]*) -- CMFD fission source - **cmfd_entropy** (*double[]*) -- CMFD estimate of Shannon entropy - **cmfd_balance** (*double[]*) -- RMS of the residual neutron balance equation on CMFD mesh - **cmfd_dominance** (*double[]*) -- CMFD estimate of dominance ratio - **cmfd_srccmp** (*double[]*) -- RMS comparison of difference between OpenMC and CMFD fission source **/tallies/** :Attributes: - **n_tallies** (*int*) -- Number of user-defined tallies. - **ids** (*int[]*) -- User-defined unique ID of each tally. **/tallies/meshes/** :Attributes: - **n_meshes** (*int*) -- Number of meshes in the problem. - **ids** (*int[]*) -- User-defined unique ID of each mesh. **/tallies/meshes/mesh /** :Datasets: - **type** (*char[]*) -- Type of mesh. - **dimension** (*int*) -- Number of mesh cells in each dimension. - **lower_left** (*double[]*) -- Coordinates of lower-left corner of mesh. - **upper_right** (*double[]*) -- Coordinates of upper-right corner of mesh. - **width** (*double[]*) -- Width of each mesh cell in each dimension. **/tallies/filters/** :Attributes: - **n_filters** (*int*) -- Number of filters in the problem. - **ids** (*int[]*) -- User-defined unique ID of each filter. **/tallies/filters/filter /** :Datasets: - **type** (*char[]*) -- Type of the j-th filter. Can be 'universe', 'material', 'cell', 'cellborn', 'surface', 'mesh', 'energy', 'energyout', 'distribcell', 'mu', 'polar', 'azimuthal', 'delayedgroup', or 'energyfunction'. - **n_bins** (*int*) -- Number of bins for the j-th filter. Not present for 'energyfunction' filters. - **bins** (*int[]* or *double[]*) -- Value for each filter bin of this type. Not present for 'energyfunction' filters. - **energy** (*double[]*) -- Energy grid points for energyfunction interpolation. Only used for 'energyfunction' filters. - **y** (*double[]*) -- Interpolant values for energyfunction interpolation. Only used for 'energyfunction' filters. **/tallies/derivatives/derivative /** :Datasets: - **independent variable** (*char[]*) -- Independent variable of tally derivative. - **material** (*int*) -- ID of the perturbed material. - **nuclide** (*char[]*) -- Alias of the perturbed nuclide. - **estimator** (*char[]*) -- Type of tally estimator, either 'analog', 'tracklength', or 'collision'. **/tallies/tally /** :Datasets: - **n_realizations** (*int*) -- Number of realizations. - **n_filters** (*int*) -- Number of filters used. - **filters** (*int[]*) -- User-defined unique IDs of the filters on the tally - **nuclides** (*char[][]*) -- Array of nuclides to tally. Note that if no nuclide is specified in the user input, a single 'total' nuclide appears here. - **derivative** (*int*) -- ID of the derivative applied to the tally. - **n_score_bins** (*int*) -- Number of scoring bins for a single nuclide. - **score_bins** (*char[][]*) -- Values of specified scores. - **results** (*double[][][2]*) -- Accumulated sum and sum-of-squares for each bin of the i-th tally. The first dimension represents combinations of filter bins, the second dimensions represents scoring bins, and the third dimension has two entries for the sum and the sum-of-squares. **/runtime/** All values are given in seconds and are measured on the master process. :Datasets: - **total initialization** (*double*) -- Time spent reading inputs, allocating arrays, etc. - **reading cross sections** (*double*) -- Time spent loading cross section libraries (this is a subset of initialization). - **simulation** (*double*) -- Time spent between initialization and finalization. - **transport** (*double*) -- Time spent transporting particles. - **inactive batches** (*double*) -- Time spent in the inactive batches (including non-transport activities like communcating sites). - **active batches** (*double*) -- Time spent in the active batches (including non-transport activities like communicating sites). - **synchronizing fission bank** (*double*) -- Time spent sampling source particles from fission sites and communicating them to other processes for load balancing. - **sampling source sites** (*double*) -- Time spent sampling source particles from fission sites. - **SEND-RECV source sites** (*double*) -- Time spent communicating source sites between processes for load balancing. - **accumulating tallies** (*double*) -- Time spent communicating tally results and evaluating their statistics. - **CMFD** (*double*) -- Time spent evaluating CMFD. - **CMFD building matrices** (*double*) -- Time spent buliding CMFD matrices. - **CMFD solving matrices** (*double*) -- Time spent solving CMFD matrices. - **total** (*double*) -- Total time spent in the program.