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fixed typo in mgxs_library.py and added comment to python doc string noting beta is not importance-weighted

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This commit is contained in:
Sam Shaner 2016-10-18 23:33:47 -04:00
parent 857593ad47
commit 9dad1d1c77
2 changed files with 7 additions and 1 deletions
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5
openmc/mgxs/mdgxs.py
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@ -1468,6 +1468,11 @@ class Beta(MDGXS):
\beta_{d,g} &= \frac{\langle \nu^d \sigma_f \phi \rangle}
{\langle \nu \sigma_f \phi \rangle}
NOTE: The Beta MGXS is the delayed neutron fraction computed directly from
the nuclear data. Often the delayed neutron fraction is
"importance-weighted" by the adjoint flux and called "beta-effective". It
is important to make clear that this Beta is not importance-weighted.
Parameters
----------
domain : openmc.Material or openmc.Cell or openmc.Universe or openmc.Mesh

3
openmc/mgxs_library.py
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@ -1918,7 +1918,8 @@ class MGXSLibrary(object):
@num_delayed_groups.setter
def num_delayed_groups(self, num_delayed_groups):
check_type('num_delayed_groups', num_delayed_groups, int)
check_greater_than('delayed_groups', delayed_groups, 0, equality=True)
check_greater_than('delayed_groups', num_delayed_groups, 0,
equality=True)
self._num_delayed_groups = num_delayed_groups
def add_xsdata(self, xsdata):