From b7a4beff5c3b782a31b6a9203891b2ff11cef9e2 Mon Sep 17 00:00:00 2001
From: Yue JIN <yjin@nustarnuclear.com>
Date: Wed, 9 Sep 2020 13:36:43 +0800
Subject: [PATCH] Make mix_materials() inherit "depletable" attribute of
 involved materials

---
 openmc/material.py | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/openmc/material.py b/openmc/material.py
index 323cb1f14f..8dea2ce0a9 100644
--- a/openmc/material.py
+++ b/openmc/material.py
@@ -1079,6 +1079,13 @@ class Material(IDManagerMixin):
         new_density = np.sum([dens for dens in mass_per_cc.values()])
         new_mat.set_density('g/cm3', new_density)
 
+        # If any of the involved materials is depletable, the new material is 
+        # depletable
+        for mat in materials:
+            if mat.depletable:
+                new_mat.depletable = True
+                break
+
         return new_mat
 
     @classmethod