<?xml version='1.0' encoding='utf-8'?>
<geometry>
  <cell id="1" material="1" region="-1" universe="1" />
  <surface boundary="reflective" coeffs="0.0 0.0 0.0 100.0" id="1" type="sphere" />
</geometry>
<?xml version='1.0' encoding='utf-8'?>
<materials>
  <material depletable="true" id="1">
    <density units="g/cm3" value="20.0" />
    <nuclide ao="1.0" name="U233" />
    <nuclide ao="1.0" name="Am244" />
    <nuclide ao="1.0" name="H2" />
    <nuclide ao="1.0" name="Na23" />
    <nuclide ao="1.0" name="Ta181" />
  </material>
</materials>
<?xml version='1.0' encoding='utf-8'?>
<settings>
  <run_mode>eigenvalue</run_mode>
  <particles>1000</particles>
  <batches>10</batches>
  <inactive>5</inactive>
</settings>
