grab first enetry in step time for consistent restart behavior with simulation interrupts

Author: lewisgross1296

openmc/deplete/abc.py

@@ -821,7 +821,7 @@ def _get_bos_data_from_restart(self, source_rate, bos_conc):
     def _get_start_data(self):
         if self.operator.prev_res is None:
             return 0.0, 0
-        return (self.operator.prev_res[-1].time[-1],
+        return (self.operator.prev_res[-1].time[0],
                 len(self.operator.prev_res) - 1)
 
     def integrate(

tests/unit_tests/test_deplete_continue.py

@@ -4,6 +4,7 @@
 """
 
 import pytest
+import numpy as np
 import openmc.deplete
 
 from tests import dummy_operator
@@ -27,7 +28,7 @@ def test_continue(run_in_tmpdir):
                   continue_timesteps=True).integrate()
 
     final_res = openmc.deplete.Results(operator.output_dir / "depletion_results.h5")
-    assert final_res.get_times() == [0.0, 1.0, 2.0, 3.0, 4.0]
+    assert np.array_equal(final_res.get_times(),[0.0, 1.0, 2.0, 3.0, 4.0])
 
 
 def test_continue_continue(run_in_tmpdir):
@@ -53,9 +54,9 @@ def test_continue_continue(run_in_tmpdir):
                   continue_timesteps=True).integrate()
 
     final_res = openmc.deplete.Results(operator.output_dir / "depletion_results.h5")
-    assert final_res.get_times() == [0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0]
+    assert np.array_equal(final_res.get_times(),[0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0])
 
-def test_killed_and_continue():
+def test_killed_and_continue(run_in_tmpdir):
     """
     Attempt to continue from a simulation that was killed mid state.
     The previous state is provided in the form of a few local files: