diff --git a/tests/regression_tests/random_ray_adjoint_fixed_source/inputs_true.dat b/tests/regression_tests/random_ray_adjoint_fixed_source/inputs_true.dat
index 30e62a8853..0adfc54884 100644
--- a/tests/regression_tests/random_ray_adjoint_fixed_source/inputs_true.dat
+++ b/tests/regression_tests/random_ray_adjoint_fixed_source/inputs_true.dat
@@ -212,8 +212,8 @@
           <parameters>0.0 0.0 0.0 30.0 30.0 30.0</parameters>
         </space>
       </source>
-      <volume_normalized_flux_tallies>True</volume_normalized_flux_tallies>
-      <adjoint>True</adjoint>
+      <volume_normalized_flux_tallies>true</volume_normalized_flux_tallies>
+      <adjoint>true</adjoint>
       <volume_estimator>naive</volume_estimator>
     </random_ray>
   </settings>
diff --git a/tests/regression_tests/random_ray_adjoint_k_eff/inputs_true.dat b/tests/regression_tests/random_ray_adjoint_k_eff/inputs_true.dat
index cd4e92aa1b..073348c41e 100644
--- a/tests/regression_tests/random_ray_adjoint_k_eff/inputs_true.dat
+++ b/tests/regression_tests/random_ray_adjoint_k_eff/inputs_true.dat
@@ -85,8 +85,8 @@
           <parameters>-1.26 -1.26 -1 1.26 1.26 1</parameters>
         </space>
       </source>
-      <volume_normalized_flux_tallies>True</volume_normalized_flux_tallies>
-      <adjoint>True</adjoint>
+      <volume_normalized_flux_tallies>true</volume_normalized_flux_tallies>
+      <adjoint>true</adjoint>
     </random_ray>
   </settings>
   <tallies>
diff --git a/tests/regression_tests/random_ray_fixed_source_domain/cell/inputs_true.dat b/tests/regression_tests/random_ray_fixed_source_domain/cell/inputs_true.dat
index 4b8af76aaf..9f1987f3ac 100644
--- a/tests/regression_tests/random_ray_fixed_source_domain/cell/inputs_true.dat
+++ b/tests/regression_tests/random_ray_fixed_source_domain/cell/inputs_true.dat
@@ -212,7 +212,7 @@
           <parameters>0.0 0.0 0.0 30.0 30.0 30.0</parameters>
         </space>
       </source>
-      <volume_normalized_flux_tallies>True</volume_normalized_flux_tallies>
+      <volume_normalized_flux_tallies>true</volume_normalized_flux_tallies>
     </random_ray>
   </settings>
   <tallies>
diff --git a/tests/regression_tests/random_ray_fixed_source_domain/material/inputs_true.dat b/tests/regression_tests/random_ray_fixed_source_domain/material/inputs_true.dat
index 82fe48b614..b4f57dbfa8 100644
--- a/tests/regression_tests/random_ray_fixed_source_domain/material/inputs_true.dat
+++ b/tests/regression_tests/random_ray_fixed_source_domain/material/inputs_true.dat
@@ -212,7 +212,7 @@
           <parameters>0.0 0.0 0.0 30.0 30.0 30.0</parameters>
         </space>
       </source>
-      <volume_normalized_flux_tallies>True</volume_normalized_flux_tallies>
+      <volume_normalized_flux_tallies>true</volume_normalized_flux_tallies>
     </random_ray>
   </settings>
   <tallies>
diff --git a/tests/regression_tests/random_ray_fixed_source_domain/universe/inputs_true.dat b/tests/regression_tests/random_ray_fixed_source_domain/universe/inputs_true.dat
index c4fd06f421..ab91f74e50 100644
--- a/tests/regression_tests/random_ray_fixed_source_domain/universe/inputs_true.dat
+++ b/tests/regression_tests/random_ray_fixed_source_domain/universe/inputs_true.dat
@@ -212,7 +212,7 @@
           <parameters>0.0 0.0 0.0 30.0 30.0 30.0</parameters>
         </space>
       </source>
-      <volume_normalized_flux_tallies>True</volume_normalized_flux_tallies>
+      <volume_normalized_flux_tallies>true</volume_normalized_flux_tallies>
     </random_ray>
   </settings>
   <tallies>
diff --git a/tests/regression_tests/random_ray_fixed_source_linear/linear/inputs_true.dat b/tests/regression_tests/random_ray_fixed_source_linear/linear/inputs_true.dat
index 4085b0c7a1..220fa7db64 100644
--- a/tests/regression_tests/random_ray_fixed_source_linear/linear/inputs_true.dat
+++ b/tests/regression_tests/random_ray_fixed_source_linear/linear/inputs_true.dat
@@ -212,7 +212,7 @@
           <parameters>0.0 0.0 0.0 30.0 30.0 30.0</parameters>
         </space>
       </source>
-      <volume_normalized_flux_tallies>True</volume_normalized_flux_tallies>
+      <volume_normalized_flux_tallies>true</volume_normalized_flux_tallies>
       <source_shape>linear</source_shape>
     </random_ray>
   </settings>
diff --git a/tests/regression_tests/random_ray_fixed_source_linear/linear_xy/inputs_true.dat b/tests/regression_tests/random_ray_fixed_source_linear/linear_xy/inputs_true.dat
index ff085d2fbb..f8c4430852 100644
--- a/tests/regression_tests/random_ray_fixed_source_linear/linear_xy/inputs_true.dat
+++ b/tests/regression_tests/random_ray_fixed_source_linear/linear_xy/inputs_true.dat
@@ -212,7 +212,7 @@
           <parameters>0.0 0.0 0.0 30.0 30.0 30.0</parameters>
         </space>
       </source>
-      <volume_normalized_flux_tallies>True</volume_normalized_flux_tallies>
+      <volume_normalized_flux_tallies>true</volume_normalized_flux_tallies>
       <source_shape>linear_xy</source_shape>
     </random_ray>
   </settings>
diff --git a/tests/regression_tests/random_ray_fixed_source_mesh/flat/inputs_true.dat b/tests/regression_tests/random_ray_fixed_source_mesh/flat/inputs_true.dat
index 12c4d74edb..c84e544fcc 100644
--- a/tests/regression_tests/random_ray_fixed_source_mesh/flat/inputs_true.dat
+++ b/tests/regression_tests/random_ray_fixed_source_mesh/flat/inputs_true.dat
@@ -212,7 +212,7 @@
           <parameters>0.0 0.0 0.0 30.0 30.0 30.0</parameters>
         </space>
       </source>
-      <volume_normalized_flux_tallies>True</volume_normalized_flux_tallies>
+      <volume_normalized_flux_tallies>true</volume_normalized_flux_tallies>
       <source_region_meshes>
         <mesh id="1">
           <domain id="1" type="universe"/>
diff --git a/tests/regression_tests/random_ray_fixed_source_mesh/linear/inputs_true.dat b/tests/regression_tests/random_ray_fixed_source_mesh/linear/inputs_true.dat
index 07adb1ff55..05c4846e6b 100644
--- a/tests/regression_tests/random_ray_fixed_source_mesh/linear/inputs_true.dat
+++ b/tests/regression_tests/random_ray_fixed_source_mesh/linear/inputs_true.dat
@@ -212,7 +212,7 @@
           <parameters>0.0 0.0 0.0 30.0 30.0 30.0</parameters>
         </space>
       </source>
-      <volume_normalized_flux_tallies>True</volume_normalized_flux_tallies>
+      <volume_normalized_flux_tallies>true</volume_normalized_flux_tallies>
       <source_region_meshes>
         <mesh id="1">
           <domain id="1" type="universe"/>
diff --git a/tests/regression_tests/random_ray_fixed_source_normalization/False/inputs_true.dat b/tests/regression_tests/random_ray_fixed_source_normalization/False/inputs_true.dat
index ab077ae8aa..0c870e1006 100644
--- a/tests/regression_tests/random_ray_fixed_source_normalization/False/inputs_true.dat
+++ b/tests/regression_tests/random_ray_fixed_source_normalization/False/inputs_true.dat
@@ -212,7 +212,7 @@
           <parameters>0.0 0.0 0.0 30.0 30.0 30.0</parameters>
         </space>
       </source>
-      <volume_normalized_flux_tallies>False</volume_normalized_flux_tallies>
+      <volume_normalized_flux_tallies>false</volume_normalized_flux_tallies>
     </random_ray>
   </settings>
   <tallies>
diff --git a/tests/regression_tests/random_ray_fixed_source_normalization/True/inputs_true.dat b/tests/regression_tests/random_ray_fixed_source_normalization/True/inputs_true.dat
index c4fd06f421..ab91f74e50 100644
--- a/tests/regression_tests/random_ray_fixed_source_normalization/True/inputs_true.dat
+++ b/tests/regression_tests/random_ray_fixed_source_normalization/True/inputs_true.dat
@@ -212,7 +212,7 @@
           <parameters>0.0 0.0 0.0 30.0 30.0 30.0</parameters>
         </space>
       </source>
-      <volume_normalized_flux_tallies>True</volume_normalized_flux_tallies>
+      <volume_normalized_flux_tallies>true</volume_normalized_flux_tallies>
     </random_ray>
   </settings>
   <tallies>
diff --git a/tests/regression_tests/random_ray_fixed_source_subcritical/flat/inputs_true.dat b/tests/regression_tests/random_ray_fixed_source_subcritical/flat/inputs_true.dat
index a124b5e3c4..0c05a71df3 100644
--- a/tests/regression_tests/random_ray_fixed_source_subcritical/flat/inputs_true.dat
+++ b/tests/regression_tests/random_ray_fixed_source_subcritical/flat/inputs_true.dat
@@ -115,7 +115,7 @@
           <parameters>-1.26 -1.26 -1 1.26 1.26 1</parameters>
         </space>
       </source>
-      <volume_normalized_flux_tallies>False</volume_normalized_flux_tallies>
+      <volume_normalized_flux_tallies>false</volume_normalized_flux_tallies>
       <source_shape>flat</source_shape>
     </random_ray>
   </settings>
diff --git a/tests/regression_tests/random_ray_fixed_source_subcritical/linear_xy/inputs_true.dat b/tests/regression_tests/random_ray_fixed_source_subcritical/linear_xy/inputs_true.dat
index cc557afb6e..a67495bf16 100644
--- a/tests/regression_tests/random_ray_fixed_source_subcritical/linear_xy/inputs_true.dat
+++ b/tests/regression_tests/random_ray_fixed_source_subcritical/linear_xy/inputs_true.dat
@@ -115,7 +115,7 @@
           <parameters>-1.26 -1.26 -1 1.26 1.26 1</parameters>
         </space>
       </source>
-      <volume_normalized_flux_tallies>False</volume_normalized_flux_tallies>
+      <volume_normalized_flux_tallies>false</volume_normalized_flux_tallies>
       <source_shape>linear_xy</source_shape>
     </random_ray>
   </settings>
diff --git a/tests/regression_tests/random_ray_halton_samples/inputs_true.dat b/tests/regression_tests/random_ray_halton_samples/inputs_true.dat
index 3f058e45c2..36d5f6f227 100644
--- a/tests/regression_tests/random_ray_halton_samples/inputs_true.dat
+++ b/tests/regression_tests/random_ray_halton_samples/inputs_true.dat
@@ -85,7 +85,7 @@
           <parameters>-1.26 -1.26 -1 1.26 1.26 1</parameters>
         </space>
       </source>
-      <volume_normalized_flux_tallies>True</volume_normalized_flux_tallies>
+      <volume_normalized_flux_tallies>true</volume_normalized_flux_tallies>
       <sample_method>halton</sample_method>
     </random_ray>
   </settings>
diff --git a/tests/regression_tests/random_ray_k_eff/inputs_true.dat b/tests/regression_tests/random_ray_k_eff/inputs_true.dat
index 33c9cac339..545bd1d457 100644
--- a/tests/regression_tests/random_ray_k_eff/inputs_true.dat
+++ b/tests/regression_tests/random_ray_k_eff/inputs_true.dat
@@ -85,7 +85,7 @@
           <parameters>-1.26 -1.26 -1 1.26 1.26 1</parameters>
         </space>
       </source>
-      <volume_normalized_flux_tallies>True</volume_normalized_flux_tallies>
+      <volume_normalized_flux_tallies>true</volume_normalized_flux_tallies>
     </random_ray>
   </settings>
   <tallies>
diff --git a/tests/regression_tests/random_ray_k_eff_mesh/inputs_true.dat b/tests/regression_tests/random_ray_k_eff_mesh/inputs_true.dat
index f0822d9f96..98badea18d 100644
--- a/tests/regression_tests/random_ray_k_eff_mesh/inputs_true.dat
+++ b/tests/regression_tests/random_ray_k_eff_mesh/inputs_true.dat
@@ -85,7 +85,7 @@
           <parameters>-1.26 -1.26 -1 1.26 1.26 1</parameters>
         </space>
       </source>
-      <volume_normalized_flux_tallies>True</volume_normalized_flux_tallies>
+      <volume_normalized_flux_tallies>true</volume_normalized_flux_tallies>
       <source_region_meshes>
         <mesh id="2">
           <domain id="7" type="universe"/>
diff --git a/tests/regression_tests/random_ray_linear/linear/inputs_true.dat b/tests/regression_tests/random_ray_linear/linear/inputs_true.dat
index 0069965572..a43a66e71c 100644
--- a/tests/regression_tests/random_ray_linear/linear/inputs_true.dat
+++ b/tests/regression_tests/random_ray_linear/linear/inputs_true.dat
@@ -85,7 +85,7 @@
           <parameters>-1.26 -1.26 -1 1.26 1.26 1</parameters>
         </space>
       </source>
-      <volume_normalized_flux_tallies>True</volume_normalized_flux_tallies>
+      <volume_normalized_flux_tallies>true</volume_normalized_flux_tallies>
       <source_shape>linear</source_shape>
     </random_ray>
   </settings>
diff --git a/tests/regression_tests/random_ray_linear/linear_xy/inputs_true.dat b/tests/regression_tests/random_ray_linear/linear_xy/inputs_true.dat
index 81527c4793..7f76f2fd1c 100644
--- a/tests/regression_tests/random_ray_linear/linear_xy/inputs_true.dat
+++ b/tests/regression_tests/random_ray_linear/linear_xy/inputs_true.dat
@@ -85,7 +85,7 @@
           <parameters>-1.26 -1.26 -1 1.26 1.26 1</parameters>
         </space>
       </source>
-      <volume_normalized_flux_tallies>True</volume_normalized_flux_tallies>
+      <volume_normalized_flux_tallies>true</volume_normalized_flux_tallies>
       <source_shape>linear_xy</source_shape>
     </random_ray>
   </settings>
diff --git a/tests/regression_tests/random_ray_point_source_locator/inputs_true.dat b/tests/regression_tests/random_ray_point_source_locator/inputs_true.dat
index 82ad979da8..088f803bfa 100644
--- a/tests/regression_tests/random_ray_point_source_locator/inputs_true.dat
+++ b/tests/regression_tests/random_ray_point_source_locator/inputs_true.dat
@@ -211,7 +211,7 @@
           <parameters>0.0 0.0 0.0 30.0 30.0 30.0</parameters>
         </space>
       </source>
-      <volume_normalized_flux_tallies>True</volume_normalized_flux_tallies>
+      <volume_normalized_flux_tallies>true</volume_normalized_flux_tallies>
       <source_region_meshes>
         <mesh id="1">
           <domain id="6" type="universe"/>
diff --git a/tests/regression_tests/random_ray_void/flat/inputs_true.dat b/tests/regression_tests/random_ray_void/flat/inputs_true.dat
index ea8c22f0b5..aa28e7b68b 100644
--- a/tests/regression_tests/random_ray_void/flat/inputs_true.dat
+++ b/tests/regression_tests/random_ray_void/flat/inputs_true.dat
@@ -212,7 +212,7 @@
           <parameters>0.0 0.0 0.0 30.0 30.0 30.0</parameters>
         </space>
       </source>
-      <volume_normalized_flux_tallies>True</volume_normalized_flux_tallies>
+      <volume_normalized_flux_tallies>true</volume_normalized_flux_tallies>
       <source_shape>flat</source_shape>
     </random_ray>
   </settings>
diff --git a/tests/regression_tests/random_ray_void/linear/inputs_true.dat b/tests/regression_tests/random_ray_void/linear/inputs_true.dat
index a089604ef4..e4b2f22fa2 100644
--- a/tests/regression_tests/random_ray_void/linear/inputs_true.dat
+++ b/tests/regression_tests/random_ray_void/linear/inputs_true.dat
@@ -212,7 +212,7 @@
           <parameters>0.0 0.0 0.0 30.0 30.0 30.0</parameters>
         </space>
       </source>
-      <volume_normalized_flux_tallies>True</volume_normalized_flux_tallies>
+      <volume_normalized_flux_tallies>true</volume_normalized_flux_tallies>
       <source_shape>linear</source_shape>
     </random_ray>
   </settings>
diff --git a/tests/regression_tests/random_ray_volume_estimator/hybrid/inputs_true.dat b/tests/regression_tests/random_ray_volume_estimator/hybrid/inputs_true.dat
index 089534d744..8e8a8ed9b8 100644
--- a/tests/regression_tests/random_ray_volume_estimator/hybrid/inputs_true.dat
+++ b/tests/regression_tests/random_ray_volume_estimator/hybrid/inputs_true.dat
@@ -212,7 +212,7 @@
           <parameters>0.0 0.0 0.0 30.0 30.0 30.0</parameters>
         </space>
       </source>
-      <volume_normalized_flux_tallies>True</volume_normalized_flux_tallies>
+      <volume_normalized_flux_tallies>true</volume_normalized_flux_tallies>
       <volume_estimator>hybrid</volume_estimator>
     </random_ray>
   </settings>
diff --git a/tests/regression_tests/random_ray_volume_estimator/naive/inputs_true.dat b/tests/regression_tests/random_ray_volume_estimator/naive/inputs_true.dat
index 56507df045..1e25b97da6 100644
--- a/tests/regression_tests/random_ray_volume_estimator/naive/inputs_true.dat
+++ b/tests/regression_tests/random_ray_volume_estimator/naive/inputs_true.dat
@@ -212,7 +212,7 @@
           <parameters>0.0 0.0 0.0 30.0 30.0 30.0</parameters>
         </space>
       </source>
-      <volume_normalized_flux_tallies>True</volume_normalized_flux_tallies>
+      <volume_normalized_flux_tallies>true</volume_normalized_flux_tallies>
       <volume_estimator>naive</volume_estimator>
     </random_ray>
   </settings>
diff --git a/tests/regression_tests/random_ray_volume_estimator/simulation_averaged/inputs_true.dat b/tests/regression_tests/random_ray_volume_estimator/simulation_averaged/inputs_true.dat
index 0331b562cd..78c1626976 100644
--- a/tests/regression_tests/random_ray_volume_estimator/simulation_averaged/inputs_true.dat
+++ b/tests/regression_tests/random_ray_volume_estimator/simulation_averaged/inputs_true.dat
@@ -212,7 +212,7 @@
           <parameters>0.0 0.0 0.0 30.0 30.0 30.0</parameters>
         </space>
       </source>
-      <volume_normalized_flux_tallies>True</volume_normalized_flux_tallies>
+      <volume_normalized_flux_tallies>true</volume_normalized_flux_tallies>
       <volume_estimator>simulation_averaged</volume_estimator>
     </random_ray>
   </settings>
diff --git a/tests/regression_tests/random_ray_volume_estimator_linear/hybrid/inputs_true.dat b/tests/regression_tests/random_ray_volume_estimator_linear/hybrid/inputs_true.dat
index 343833210e..47a8a71824 100644
--- a/tests/regression_tests/random_ray_volume_estimator_linear/hybrid/inputs_true.dat
+++ b/tests/regression_tests/random_ray_volume_estimator_linear/hybrid/inputs_true.dat
@@ -212,7 +212,7 @@
           <parameters>0.0 0.0 0.0 30.0 30.0 30.0</parameters>
         </space>
       </source>
-      <volume_normalized_flux_tallies>True</volume_normalized_flux_tallies>
+      <volume_normalized_flux_tallies>true</volume_normalized_flux_tallies>
       <source_shape>linear</source_shape>
       <volume_estimator>hybrid</volume_estimator>
     </random_ray>
diff --git a/tests/regression_tests/random_ray_volume_estimator_linear/naive/inputs_true.dat b/tests/regression_tests/random_ray_volume_estimator_linear/naive/inputs_true.dat
index 50be43eb38..80a9ada4d5 100644
--- a/tests/regression_tests/random_ray_volume_estimator_linear/naive/inputs_true.dat
+++ b/tests/regression_tests/random_ray_volume_estimator_linear/naive/inputs_true.dat
@@ -212,7 +212,7 @@
           <parameters>0.0 0.0 0.0 30.0 30.0 30.0</parameters>
         </space>
       </source>
-      <volume_normalized_flux_tallies>True</volume_normalized_flux_tallies>
+      <volume_normalized_flux_tallies>true</volume_normalized_flux_tallies>
       <source_shape>linear</source_shape>
       <volume_estimator>naive</volume_estimator>
     </random_ray>
diff --git a/tests/regression_tests/random_ray_volume_estimator_linear/simulation_averaged/inputs_true.dat b/tests/regression_tests/random_ray_volume_estimator_linear/simulation_averaged/inputs_true.dat
index 3d64ab9783..4f032a62a8 100644
--- a/tests/regression_tests/random_ray_volume_estimator_linear/simulation_averaged/inputs_true.dat
+++ b/tests/regression_tests/random_ray_volume_estimator_linear/simulation_averaged/inputs_true.dat
@@ -212,7 +212,7 @@
           <parameters>0.0 0.0 0.0 30.0 30.0 30.0</parameters>
         </space>
       </source>
-      <volume_normalized_flux_tallies>True</volume_normalized_flux_tallies>
+      <volume_normalized_flux_tallies>true</volume_normalized_flux_tallies>
       <source_shape>linear</source_shape>
       <volume_estimator>simulation_averaged</volume_estimator>
     </random_ray>
diff --git a/tests/regression_tests/weightwindows_fw_cadis/inputs_true.dat b/tests/regression_tests/weightwindows_fw_cadis/inputs_true.dat
index 448b4b145c..5fa6505ddf 100644
--- a/tests/regression_tests/weightwindows_fw_cadis/inputs_true.dat
+++ b/tests/regression_tests/weightwindows_fw_cadis/inputs_true.dat
@@ -227,7 +227,7 @@
           <parameters>0.0 0.0 0.0 30.0 30.0 30.0</parameters>
         </space>
       </source>
-      <volume_normalized_flux_tallies>True</volume_normalized_flux_tallies>
+      <volume_normalized_flux_tallies>true</volume_normalized_flux_tallies>
       <volume_estimator>naive</volume_estimator>
     </random_ray>
   </settings>
diff --git a/tests/regression_tests/weightwindows_fw_cadis_mesh/flat/inputs_true.dat b/tests/regression_tests/weightwindows_fw_cadis_mesh/flat/inputs_true.dat
index d82aa6fae8..ceb89e6e34 100644
--- a/tests/regression_tests/weightwindows_fw_cadis_mesh/flat/inputs_true.dat
+++ b/tests/regression_tests/weightwindows_fw_cadis_mesh/flat/inputs_true.dat
@@ -227,7 +227,7 @@
           <parameters>0.0 0.0 0.0 30.0 30.0 30.0</parameters>
         </space>
       </source>
-      <volume_normalized_flux_tallies>True</volume_normalized_flux_tallies>
+      <volume_normalized_flux_tallies>true</volume_normalized_flux_tallies>
       <source_region_meshes>
         <mesh id="1">
           <domain id="6" type="universe"/>
diff --git a/tests/regression_tests/weightwindows_fw_cadis_mesh/linear/inputs_true.dat b/tests/regression_tests/weightwindows_fw_cadis_mesh/linear/inputs_true.dat
index 9e4b21d27b..c7691e950c 100644
--- a/tests/regression_tests/weightwindows_fw_cadis_mesh/linear/inputs_true.dat
+++ b/tests/regression_tests/weightwindows_fw_cadis_mesh/linear/inputs_true.dat
@@ -227,7 +227,7 @@
           <parameters>0.0 0.0 0.0 30.0 30.0 30.0</parameters>
         </space>
       </source>
-      <volume_normalized_flux_tallies>True</volume_normalized_flux_tallies>
+      <volume_normalized_flux_tallies>true</volume_normalized_flux_tallies>
       <source_region_meshes>
         <mesh id="1">
           <domain id="6" type="universe"/>