diff --git a/smr/smr/materials.py b/smr/smr/materials.py
index 9f718f9..989bda5 100644
--- a/smr/smr/materials.py
+++ b/smr/smr/materials.py
@@ -63,6 +63,15 @@ mats['In'].add_element('Mn', 0.0087, 'wo')
 mats['In'].add_element('Fe', 0.2863, 'wo')
 mats['In'].add_element('Ni', 0.5119, 'wo')
 
+# Create stainless steel 302
+mats['SS302'] = openmc.Material(name='SS302')
+mats['SS302'].set_density('g/cm3', 7.86)
+mats['SS302'].add_element('Si', 0.01, 'wo')
+mats['SS302'].add_element('Cr', 0.18, 'wo')
+mats['SS302'].add_element('Mn', 0.02, 'wo')
+mats['SS302'].add_element('Fe', 0.70, 'wo')
+mats['SS302'].add_element('Ni', 0.09, 'wo')
+
 # Create stainless steel material
 mats['SS'] = openmc.Material(name='SS304')
 mats['SS'].set_density('g/cc', 8.03)
diff --git a/smr/smr/pins.py b/smr/smr/pins.py
index 03aeb0a..676fc8a 100644
--- a/smr/smr/pins.py
+++ b/smr/smr/pins.py
@@ -674,16 +674,16 @@ def pin_universes(num_rings=10, num_axial=196, depleted=False):
     univs['end plug'] = make_pin(
         'end plug',
         [surfs['clad OR']],
-        [mats['Zr'], mats['H2O']])
+        [mats['M5'], mats['H2O']])
 
     univs['pin plenum'] = make_pin(
         'pin plenum',
         surfaces=[surfs['plenum spring OR'],
                   surfs['clad IR'],
                   surfs['clad OR']],
-        materials=[mats['In'],
+        materials=[mats['SS302'],
                    mats['He'],
-                   mats['Zr'],
+                   mats['M5'],
                    mats['H2O']])
 
     univs['pin plenum grid (intermediate)'] = make_pin(