Update graphite grade and regold tests. Refs idaholab#537.

Author: gambka

microreactors/mrad/legacy/steady/MP_FC_ss_bison.i

@@ -140,6 +140,7 @@
     packing_fraction = 0.4
     specific_heat_scale_factor = 1.0
     thermal_conductivity_scale_factor = 1.0
+    graphite_grade = IG_110
     fast_neutron_fluence = 0 # Fresh matrix (near BoC)
     temperature = temp
   []
@@ -149,6 +150,7 @@
     packing_fraction = 0
     specific_heat_scale_factor = 1.0
     thermal_conductivity_scale_factor = 1.0
+    graphite_grade = IG_110
     fast_neutron_fluence = 0 # Fresh matrix (near BoC)
     temperature = temp
   []

microreactors/mrad/steady/HPMR_thermo_ss.i

@@ -162,6 +162,7 @@ corr_factor = '${fparse R_hp_hole / R_clad_o * area_correction / perimeter_corre
     type = GraphiteMatrixThermal
     block = 'fuel_quad fuel_tri'
     # unirradiated_type = 'A3_27_1800'
+    graphite_grade = IG_110
     packing_fraction = 0.4
     specific_heat_scale_factor = 1.0
     thermal_conductivity_scale_factor = 1.0
@@ -172,6 +173,7 @@ corr_factor = '${fparse R_hp_hole / R_clad_o * area_correction / perimeter_corre
     type = GraphiteMatrixThermal
     block = 'monolith '
     # unirradiated_type = 'A3_27_1800'
+    graphite_grade = IG_110
     packing_fraction = 0
     specific_heat_scale_factor = 1.0
     thermal_conductivity_scale_factor = 1.0

microreactors/mrad/triso_failure/UnitCell_with_TM/MP_ss_bison.i

@@ -185,6 +185,7 @@ hp_surfs = 'HP_surf'
     packing_fraction = 0.4
     specific_heat_scale_factor = 1.0
     thermal_conductivity_scale_factor = 1.0
+    graphite_grade = IG_110
     fast_neutron_fluence = 0 #6.75E+24 # this value is neutron fluence over 0.1MeV
     temperature = temp
   []
@@ -194,6 +195,7 @@ hp_surfs = 'HP_surf'
     packing_fraction = 0
     specific_heat_scale_factor = 1.0
     thermal_conductivity_scale_factor = 1.0
+    graphite_grade = IG_110
     fast_neutron_fluence = 0 #6.75E+24 # this value is neutron fluence over 0.1MeV
     temperature = temp
   []