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Update B4C docstring for assumed TD frac #1117

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8 changes: 7 additions & 1 deletion armi/materials/b4c.py
Expand Up @@ -12,7 +12,13 @@
# See the License for the specific language governing permissions and
# limitations under the License.

"""Boron carbide; a very typical reactor control material."""
"""
Boron carbide; a very typical reactor control material.

Note that this material defaults to a theoretical density fraction of 0.9, reflecting
the difficulty of producing B4C at 100% theoretical density in real life. To get
different fraction, use the `TD_frac` material modification in your assembly definition.
"""
from armi import runLog
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from armi.materials import material
from armi.nucDirectory import nuclideBases
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