<?xml version='1.0' encoding='utf-8'?>
<model>
  <materials>
    <material depletable="true" id="1">
      <density units="g/cm3" value="10.0"/>
      <nuclide ao="1.0" name="U235"/>
    </material>
    <material id="2">
      <density units="g/cm3" value="1.0"/>
      <nuclide ao="1.0" name="Zr90"/>
    </material>
  </materials>
  <geometry>
    <cell id="1" material="1" region="1 -2 3 -4 10 -9" universe="1"/>
    <cell id="2" material="2" region="~(1 -2 3 -4) (5 -6 7 -8) 10 -9" universe="1"/>
    <surface coeffs="-5.0" id="1" name="minimum x" type="x-plane"/>
    <surface coeffs="5.0" id="2" name="maximum x" type="x-plane"/>
    <surface coeffs="-5.0" id="3" name="minimum y" type="y-plane"/>
    <surface coeffs="5.0" id="4" name="maximum y" type="y-plane"/>
    <surface boundary="reflective" coeffs="-10.0" id="5" name="minimum x" type="x-plane"/>
    <surface boundary="reflective" coeffs="10.0" id="6" name="maximum x" type="x-plane"/>
    <surface boundary="reflective" coeffs="-10.0" id="7" name="minimum y" type="y-plane"/>
    <surface boundary="reflective" coeffs="10.0" id="8" name="maximum y" type="y-plane"/>
    <surface boundary="vacuum" coeffs="10.0" id="9" type="z-plane"/>
    <surface boundary="vacuum" coeffs="-10.0" id="10" type="z-plane"/>
  </geometry>
  <settings>
    <run_mode>eigenvalue</run_mode>
    <particles>1000</particles>
    <batches>5</batches>
    <inactive>0</inactive>
  </settings>
  <tallies>
    <mesh id="1">
      <dimension>3 3 3</dimension>
      <lower_left>-10.0 -10.0 -10.0</lower_left>
      <upper_right>10.0 10.0 10.0</upper_right>
    </mesh>
    <filter id="1" type="meshsurface">
      <bins>1</bins>
    </filter>
    <filter id="2" type="energy">
      <bins>0.0 0.253 20000000.0</bins>
    </filter>
    <tally id="1">
      <filters>1</filters>
      <scores>current</scores>
    </tally>
    <tally id="2">
      <filters>1 2</filters>
      <scores>current</scores>
    </tally>
  </tallies>
</model>
