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update description according to comments

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liangjg 2016-05-09 22:34:18 -04:00
parent bbb5690a00
commit 95406d52fc
2 changed files with 8 additions and 9 deletions
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9
docs/source/usersguide/input.rst
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@ -1215,11 +1215,10 @@ Each ``material`` element can have the following attributes or sub-elements:
An element with attributes/sub-elements called ``value`` and ``units``. The
``value`` attribute is the numeric value of the density while the ``units``
can be "g/cm3", "kg/m3", "atom/b-cm", "atom/cm3", or "sum". The "sum" unit
indicates that values appearing in ``ao`` or ``wo`` attributes for ``<nuclide>`` and
``<element>`` sub-elements are to be interpreted as absolute nuclide/element
densities in atom/b-cm or g/cm3, and the total density of the material is taken as
the sum of all nuclides/elements. The "sum" option cannot be used in
conjunction with atom or weight percents. The "macro" unit is used with
indicates that values appearing in ``ao`` or ``wo`` attributes for ``<nuclide>``
and ``<element>`` sub-elements are to be interpreted as absolute nuclide/element
densities in atom/b-cm or g/cm3, and the total density of the material is
taken as the sum of all nuclides/elements. The "macro" unit is used with
a ``macroscopic`` quantity to indicate that the density is already included
in the library and thus not needed here. However, if a value is provided
for the ``value``, then this is treated as a number density multiplier on

8
openmc/material.py
View file

@ -251,16 +251,16 @@ class Material(object):
if units is 'sum':
if density is not None:
msg = 'Density "{0}" for Material ID="{1}" is ignored ' \
'because the unit is "sum"'.format(density, self._id)
'because the unit is "sum"'.format(density, self.id)
warnings.warn(msg)
else:
if density is None:
msg = 'Unable to set the density for Material ID="{0}" ' \
'because a density must be set when not using ' \
'"sum" unit'.format(self._id)
'because a density value must be given when not using ' \
'"sum" unit'.format(self.id)
raise ValueError(msg)
cv.check_type('the density for Material ID="{0}"'.format(self._id),
cv.check_type('the density for Material ID="{0}"'.format(self.id),
density, Real)
self._density = density