OpenMC-Depletion-Volume-Update

Modification to OpenMC to update the cell volume during the depletion calculation for multi-physics coupling

Modifications:

abc.py:

1. Line 714: check_greater_than('timestep', timestep, 0.0, True)

   Allowed for 0 time-step for iteration within a burnup step

results.py:

1. Lines 509-251: def update_volumes(self, geometry)

   Define a function to update the cell volume in the depletion for multi-physics coupling

operator.py:

1. Line 170: volume_update=False

   Add a parameter to control update of the volume

2. Lines 215-218:

   Update the volume or not

To turn on/off the volume update:

When defining the operator in OpenMC:

1. On: operator = openmc.deplete.Operator(geometry=geometry, settings=settings, volume_update=True, chain_file=self.chain, prev_results=results)
2. Off: operator = openmc.deplete.Operator(geometry=geometry, settings=settings, volume_update=False, chain_file=self.chain, prev_results=results) or operator = openmc.deplete.Operator(geometry=geometry, settings=settings, chain_file=self.chain, prev_results=result)