docstring modifications and reduced histories in test_mg_convert in an attempt to bring its runtime down

openmc/mgxs_library.py

@@ -1690,8 +1690,7 @@ class XSdata(object):
         azimuthal bins of an XSdata object that already uses an angular
         representation. Finally, this method simply uses an arithmetic mean to
         convert from an angular to isotropic representation; no flux-weighting
-        is applied and therefore the correctness of the solution is not
-        guaranteed.
+        is applied and therefore reaction rates will not be preserved.
 
         Parameters
         ----------
@@ -2453,8 +2452,7 @@ class MGXSLibrary(object):
         azimuthal bins of an XSdata object that already uses an angular
         representation. Finally, this method simply uses an arithmetic mean to
         convert from an angular to isotropic representation; no flux-weighting
-        is applied and therefore the correctness of the solution is not
-        guaranteed.
+        is applied and therefore the reaction rates will not be preserved.
 
         Parameters
         ----------

tests/test_mg_convert/inputs_true.dat

@@ -17,9 +17,9 @@
 <?xml version='1.0' encoding='utf-8'?>
 <settings>
     <eigenvalue>
-        <particles>1000</particles>
-        <batches>1000</batches>
-        <inactive>100</inactive>
+        <particles>100</particles>
+        <batches>10</batches>
+        <inactive>5</inactive>
     </eigenvalue>
     <source strength="1.0">
         <space type="box">

tests/test_mg_convert/results_true.dat

@@ -1,24 +1,24 @@
 k-combined:
-9.957366E-01 7.836427E-05
+9.930873E-01 2.221904E-03
 k-combined:
-9.963227E-01 8.010344E-05
+9.948148E-01 1.216270E-03
 k-combined:
-9.957366E-01 7.836427E-05
+9.930873E-01 2.221904E-03
 k-combined:
-9.955152E-01 8.132242E-05
+9.755034E-01 6.178296E-03
 k-combined:
-9.953937E-01 8.452497E-05
+9.738059E-01 4.529068E-03
 k-combined:
-9.957744E-01 8.816057E-05
+9.866847E-01 9.485912E-03
 k-combined:
-9.955332E-01 8.894390E-05
+9.755024E-01 6.179047E-03
 k-combined:
-9.956463E-01 8.378533E-05
+9.738061E-01 4.529462E-03
 k-combined:
-9.955875E-01 8.818927E-05
+9.866835E-01 9.485832E-03
 k-combined:
-9.957017E-01 8.726677E-05
+9.719024E-01 4.213166E-03
 k-combined:
-9.957366E-01 7.836427E-05
+9.930873E-01 2.221904E-03
 k-combined:
-9.957366E-01 7.836427E-05
+9.930873E-01 2.221904E-03

tests/test_mg_convert/test_mg_convert.py

@@ -11,9 +11,9 @@ from testing_harness import PyAPITestHarness
 import openmc
 
 # OpenMC simulation parameters
-batches = 1000
-inactive = 100
-particles = 1000
+batches = 10
+inactive = 5
+particles = 100
 
 
 def build_mgxs_library(convert):