openmc.deplete.abc.TalliedFissionYieldHelper

class openmc.deplete.abc.TalliedFissionYieldHelper(chain_nuclides)

Abstract class for computing fission yields with tallies

Generates a basic fission rate tally in all burnable materials with generate_tallies(), and set nuclides to be tallied with update_tally_nuclides(). Subclasses will need to implement unpack() and weighted_yields().

Parameters:

chain_nuclides (iterable of openmc.deplete.Nuclide) – Nuclides tracked in the depletion chain. Not necessary that all have yield data.

Variables:

• constant_yields (dict of str to openmc.deplete.FissionYield) – Fission yields for all nuclides that only have one set of fission yield data. Can be accessed as {parent: {product: yield}}
• results (None or numpy.ndarray) – Tally results shaped in a manner useful to this helper.

generate_tallies(materials, mat_indexes)

Construct the fission rate tally

Parameters:

• materials (iterable of openmc.lib.Material) – Materials to be used in openmc.lib.MaterialFilter
• mat_indexes (iterable of int) – Indices of tallied materials that will have their fission yields computed by this helper. Necessary as the openmc.deplete.Operator that uses this helper may only burn a subset of all materials when running in parallel mode.

unpack()

Unpack tallies after a transport run.

Abstract because each subclass will need to arrange its tally data.

update_tally_nuclides(nuclides)

Tally nuclides with non-zero density and multiple yields

Must be run after generate_tallies().

Parameters:nuclides (iterable of str) – Potential nuclides to be tallied, such as those with non-zero density at this stage. Returns:nuclides – Union of input nuclides and those that have multiple sets of yield data. Sorted by nuclide name Return type:list of str Raises:AttributeError – If tallies not generated