From 3e5afd21eb67512c05111ad49e848b52f85dc981 Mon Sep 17 00:00:00 2001
From: Paul Romano <paul.k.romano@gmail.com>
Date: Fri, 22 Jul 2022 16:42:24 -0500
Subject: [PATCH] Add missing definition of _sources in Decay.__init__

---
 openmc/data/decay.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/openmc/data/decay.py b/openmc/data/decay.py
index 96c3f562af..2c2505bf56 100644
--- a/openmc/data/decay.py
+++ b/openmc/data/decay.py
@@ -337,6 +337,7 @@ class Decay(EqualityMixin):
         self.modes = []
         self.spectra = {}
         self.average_energies = {}
+        self._sources = None
 
         # Get head record
         items = get_head_record(file_obj)