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Clarify documentation on Operator diff_burnable_mats

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In PR #1392, it was revealed that the distribution of material
volumes with ``diff_burnable_mats`` was not clear. In that PR,
the Operator now divides the volume of the shared material
equally across all identical and newly created instances.
This commit adds some clarifying language into the Operator
docstring and depletion users guide on the handling
of volumes across repeated materials.
This commit is contained in:
Andrew Johnson 2019-11-05 09:18:24 -05:00
parent 8a77ee7efd
commit 0c97807da8
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2 changed files with 4 additions and 1 deletions
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docs/source/usersguide/depletion.rst
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@ -127,7 +127,9 @@ of the same material as a unique material definition with::
For our example problem, this would deplete fuel on the outer region of the problem
with different reaction rates than those in the center. Materials will be depleted
corresponding to their local neutron spectra, and have unique compositions at each
transport step.
transport step. The volume of the original ``fuel_3`` material must represent
the volume of **all** the ``fuel_3`` in the problem. When creating the unique
materials, this volume will be equally distributed across all material instances.
.. note::