Change XSGM interface stack position to just before before MC2 (#1288)

Author: HunterPSmith

armi/physics/fuelCycle/fuelHandlerInterface.py

@@ -65,13 +65,15 @@ def interactBOC(self, cycle=None):
         # if lattice physics is requested, compute it here instead of after fuel management.
         # This enables XS to exist for branch searching, etc.
         mc2 = self.o.getInterface(function="latticePhysics")
+        xsgm = self.o.getInterface("xsGroups")
         if mc2 and self.cs[CONF_RUN_LATTICE_BEFORE_SHUFFLING]:
             runLog.extra(
                 'Running {0} lattice physics before fuel management due to the "{1}"'
                 " setting being activated.".format(
                     mc2, CONF_RUN_LATTICE_BEFORE_SHUFFLING
                 )
             )
+            xsgm.interactBOC(cycle=cycle)
             mc2.interactBOC(cycle=cycle)
 
         if self.enabled() and (

armi/physics/neutronics/crossSectionGroupManager.py

@@ -68,7 +68,7 @@
 from armi.utils.units import TRACE_NUMBER_DENSITY
 from armi.physics.neutronics import LatticePhysicsFrequency
 
-ORDER = interfaces.STACK_ORDER.BEFORE + interfaces.STACK_ORDER.FUEL_MANAGEMENT
+ORDER = interfaces.STACK_ORDER.BEFORE + interfaces.STACK_ORDER.CROSS_SECTIONS
 
 
 def describeInterfaces(cs):

armi/physics/neutronics/settings.py

@@ -302,7 +302,7 @@ def defineSettings():
         ),
         setting.Setting(
             CONF_XS_BLOCK_REPRESENTATION,
-            default="FluxWeightedAverage",
+            default="Average",
             label="Cross Section Block Averaging Method",
             description="The type of averaging to perform when creating cross sections for a group of blocks",
             options=[

doc/release/0.2.rst

@@ -12,6 +12,7 @@ What's new in ARMI
 #. Added ``Composite.sort()`` to allow the user to recursively sort any piece of the ``Reactor``. (`PR#1280 <https://github.com/terrapower/armi/pull/1280>`_)
 #  Revert "when using non-uniform mesh, detailed fission/activation products have cross sections generated to avoid blocks without xs data" and move capability to lattice physics (`PR#1280 <https://github.com/terrapower/armi/pull/1298>`_)
 #. Add interactCoupled method for snapshotInterface (`PR#1294 <https://github.com/terrapower/armi/pull/1294>`_)
+#. Move cross section group manager interface stack position to be just before lattice physics. (`PR#1288 <https://github.com/terrapower/armi/pull/1288>`_)
 
 Bug fixes
 ---------