<?xml version='1.0' encoding='utf-8'?>
<model>
  <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>
  <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>
  <settings>
    <run_mode>eigenvalue</run_mode>
    <particles>1000</particles>
    <batches>10</batches>
    <inactive>5</inactive>
  </settings>
  </model>
