From b1b8a4c32834f82b0687600efbffa0e3181ef4c4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sigfrid=20Stj=C3=A4rnholm?= <sigfrid@stjarnholm.com>
Date: Thu, 13 Jun 2024 05:46:18 +0200
Subject: [PATCH] Set OpenMCOperator materials to the model materials when
 diff_burnable_mats = True (#2877)

---
 openmc/deplete/openmc_operator.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/openmc/deplete/openmc_operator.py b/openmc/deplete/openmc_operator.py
index ad7a3924b7..75f0925c4e 100644
--- a/openmc/deplete/openmc_operator.py
+++ b/openmc/deplete/openmc_operator.py
@@ -142,6 +142,7 @@ class OpenMCOperator(TransportOperator):
 
         if diff_burnable_mats:
             self._differentiate_burnable_mats()
+            self.materials = self.model.materials
 
         # Determine which nuclides have cross section data
         # This nuclides variables contains every nuclides