Add energy group structure for ANL21 and ANL94 used in photon transpo…

…rt (#994)
terrapower · Nov 24, 2022 · 469b3f0 · 469b3f0
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diff --git a/armi/physics/neutronics/energyGroups.py b/armi/physics/neutronics/energyGroups.py
@@ -774,3 +774,132 @@ def _create_anl_energies_with_group_energies(group_energy_bounds):
         4.140e-01,
     ]
 )
+
+"""
+Taken from Table 5.1 of "GAMSOR: Gamma Souce Preparation and DIF3D Flux Solution",
+ANL/NE-16/50 Rev 2.0, M.A. Smith, C.H. Lee, R.N. Hill, Aug 30 2022.
+"""
+GROUP_STRUCTURE["ANL21G"] = [
+    2.0e7,
+    1.0e7,
+    8.0e6,
+    7.0e6,
+    6.0e6,
+    5.0e6,
+    4.0e6,
+    3.0e6,
+    2.5e6,
+    2.0e6,
+    1.5e6,
+    1.0e6,
+    7.0e5,
+    4.5e5,
+    3.0e5,
+    1.5e5,
+    1.0e5,
+    7.5e4,
+    4.5e4,
+    3.0e4,
+    2.0e4,
+]
+
+"""
+Taken from Table 5.2 of "GAMSOR: Gamma Souce Preparation and DIF3D Flux Solution",
+ANL/NE-16/50 Rev 2.0, M.A. Smith, C.H. Lee, R.N. Hill, Aug 30 2022.
+"""
+GROUP_STRUCTURE["ANL94G"] = [
+    2.000e07,
+    1.400e07,
+    1.200e07,
+    1.100e07,
+    1.060e07,
+    1.000e07,
+    9.500e06,
+    9.000e06,
+    8.500e06,
+    8.000e06,
+    7.750e06,
+    7.500e06,
+    7.250e06,
+    7.000e06,
+    6.750e06,
+    6.500e06,
+    6.250e06,
+    6.000e06,
+    5.750e06,
+    5.500e06,
+    5.400e06,
+    5.200e06,
+    5.000e06,
+    4.700e06,
+    4.500e06,
+    4.400e06,
+    4.200e06,
+    4.000e06,
+    3.900e06,
+    3.800e06,
+    3.650e06,
+    3.500e06,
+    3.333e06,
+    3.166e06,
+    3.000e06,
+    2.833e06,
+    2.666e06,
+    2.500e06,
+    2.333e06,
+    2.166e06,
+    2.000e06,
+    1.875e06,
+    1.750e06,
+    1.660e06,
+    1.600e06,
+    1.500e06,
+    1.420e06,
+    1.330e06,
+    1.250e06,
+    1.200e06,
+    1.125e06,
+    1.000e06,
+    9.000e05,
+    8.650e05,
+    8.250e05,
+    8.000e05,
+    7.500e05,
+    7.000e05,
+    6.750e05,
+    6.500e05,
+    6.250e05,
+    6.000e05,
+    5.750e05,
+    5.500e05,
+    5.250e05,
+    5.000e05,
+    4.500e05,
+    4.250e05,
+    4.000e05,
+    3.750e05,
+    3.500e05,
+    3.250e05,
+    3.000e05,
+    2.600e05,
+    2.200e05,
+    1.900e05,
+    1.600e05,
+    1.500e05,
+    1.400e05,
+    1.200e05,
+    1.000e05,
+    9.000e04,
+    8.000e04,
+    7.500e04,
+    6.500e04,
+    6.000e04,
+    5.500e04,
+    4.500e04,
+    4.000e04,
+    3.500e04,
+    3.000e04,
+    2.000e04,
+    1.500e04,
+    1.000e04,
+]
diff --git a/doc/release/0.2.rst b/doc/release/0.2.rst
@@ -14,6 +14,7 @@ What's new in ARMI
 #. Use r.core.p.axialMesh instead of r.core.refAssem.getAxialMesh() for the uniform mesh converter. (`PR#959 <https://github.com/terrapower/armi/pull/959>`_)
 #. Split algorithms specific to hex assemblies out of ``FuelHandler``. (`PR#962 <https://github.com/terrapower/armi/pull/962>`_)
 #. Add ability to load from a db using negative node index
+#. Add group structures for 21- and 94-groups used in photon transport
 
 Bug fixes
 ---------