<?xml version='1.0' encoding='utf-8'?>
<geometry>
  <cell id="1" material="1" region="-1" universe="1" />
  <surface boundary="vacuum" coeffs="0.0 0.0 0.0 10.0" id="1" type="sphere" />
</geometry>
<?xml version='1.0' encoding='utf-8'?>
<materials>
  <material depletable="true" id="1">
    <density units="g/cm3" value="4.5" />
    <nuclide ao="1.0" name="U235" />
  </material>
</materials>
<?xml version='1.0' encoding='utf-8'?>
<settings>
  <run_mode>eigenvalue</run_mode>
  <particles>400</particles>
  <batches>15</batches>
  <inactive>10</inactive>
  <keff_trigger>
    <threshold>0.003</threshold>
    <type>std_dev</type>
  </keff_trigger>
  <trigger>
    <active>true</active>
    <max_batches>1000</max_batches>
    <batch_interval>1</batch_interval>
  </trigger>
  <verbosity>1</verbosity>
</settings>
<?xml version='1.0' encoding='utf-8'?>
<tallies>
  <tally id="1">
    <scores>flux</scores>
  </tally>
</tallies>
