<?xml version='1.0' encoding='utf-8'?>
<model>
  <materials>
    <material depletable="true" id="1">
      <density units="g/cm3" value="12.0"/>
      <nuclide ao="1.0" name="U235"/>
    </material>
    <material id="2">
      <density units="g/cm3" value="1.0"/>
      <nuclide ao="1.0" name="H1"/>
    </material>
  </materials>
  <geometry>
    <cell id="1" material="1" region="-2" universe="1"/>
    <cell id="2" material="1" region="-3" universe="1"/>
    <cell id="3" material="1" region="-1" universe="1"/>
    <cell id="4" material="2" region="-5 4 -7 6 -9 8 2 3 1" universe="1"/>
    <surface coeffs="0.0 0.0 0.0 3 1.5 1" id="1" type="z-torus"/>
    <surface coeffs="6 0.0 0.0 3 1.5 1" id="2" type="x-torus"/>
    <surface coeffs="6 0.0 0.0 6 1 0.75" id="3" type="y-torus"/>
    <surface boundary="vacuum" coeffs="-5" id="4" type="x-plane"/>
    <surface boundary="vacuum" coeffs="14" id="5" type="x-plane"/>
    <surface boundary="vacuum" coeffs="-5" id="6" type="y-plane"/>
    <surface boundary="vacuum" coeffs="5" id="7" type="y-plane"/>
    <surface boundary="vacuum" coeffs="-8" id="8" type="z-plane"/>
    <surface boundary="vacuum" coeffs="8" id="9" type="z-plane"/>
  </geometry>
  <settings>
    <run_mode>eigenvalue</run_mode>
    <particles>1000</particles>
    <batches>10</batches>
    <inactive>5</inactive>
  </settings>
  </model>
